fs/reiserfs/journal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Write ahead logging implementation copyright Chris Mason 2000
   4  *
   5  * The background commits make this code very interrelated, and
   6  * overly complex.  I need to rethink things a bit....The major players:
   7  *
   8  * journal_begin -- call with the number of blocks you expect to log.
   9  *                  If the current transaction is too
  10  *                  old, it will block until the current transaction is
  11  *                  finished, and then start a new one.
  12  *                  Usually, your transaction will get joined in with
  13  *                  previous ones for speed.
  14  *
  15  * journal_join  -- same as journal_begin, but won't block on the current
  16  *                  transaction regardless of age.  Don't ever call
  17  *                  this.  Ever.  There are only two places it should be
  18  *                  called from, and they are both inside this file.
  19  *
  20  * journal_mark_dirty -- adds blocks into this transaction.  clears any flags
  21  *                       that might make them get sent to disk
  22  *                       and then marks them BH_JDirty.  Puts the buffer head
  23  *                       into the current transaction hash.
  24  *
  25  * journal_end -- if the current transaction is batchable, it does nothing
  26  *                   otherwise, it could do an async/synchronous commit, or
  27  *                   a full flush of all log and real blocks in the
  28  *                   transaction.
  29  *
  30  * flush_old_commits -- if the current transaction is too old, it is ended and
  31  *                      commit blocks are sent to disk.  Forces commit blocks
  32  *                      to disk for all backgrounded commits that have been
  33  *                      around too long.
  34  *                   -- Note, if you call this as an immediate flush from
  35  *                      within kupdate, it will ignore the immediate flag
  36  */
  37
  38 #include <linux/time.h>
  39 #include <linux/semaphore.h>
  40 #include <linux/vmalloc.h>
  41 #include "reiserfs.h"
  42 #include <linux/kernel.h>
  43 #include <linux/errno.h>
  44 #include <linux/fcntl.h>
  45 #include <linux/stat.h>
  46 #include <linux/string.h>
  47 #include <linux/buffer_head.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/writeback.h>
  50 #include <linux/blkdev.h>
  51 #include <linux/backing-dev.h>
  52 #include <linux/uaccess.h>
  53 #include <linux/slab.h>
  54
  55
  56 /* gets a struct reiserfs_journal_list * from a list head */
  57 #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \
  58                                j_list))
  59
  60 /* must be correct to keep the desc and commit structs at 4k */
  61 #define JOURNAL_TRANS_HALF 1018
  62 #define BUFNR 64                /*read ahead */
  63
  64 /* cnode stat bits.  Move these into reiserfs_fs.h */
  65
  66 /* this block was freed, and can't be written.  */
  67 #define BLOCK_FREED 2
  68 /* this block was freed during this transaction, and can't be written */
  69 #define BLOCK_FREED_HOLDER 3
  70
  71 /* used in flush_journal_list */
  72 #define BLOCK_NEEDS_FLUSH 4
  73 #define BLOCK_DIRTIED 5
  74
  75 /* journal list state bits */
  76 #define LIST_TOUCHED 1
  77 #define LIST_DIRTY   2
  78 #define LIST_COMMIT_PENDING  4  /* someone will commit this list */
  79
  80 /* flags for do_journal_end */
  81 #define FLUSH_ALL   1           /* flush commit and real blocks */
  82 #define COMMIT_NOW  2           /* end and commit this transaction */
  83 #define WAIT        4           /* wait for the log blocks to hit the disk */
  84
  85 static int do_journal_end(struct reiserfs_transaction_handle *, int flags);
  86 static int flush_journal_list(struct super_block *s,
  87                               struct reiserfs_journal_list *jl, int flushall);
  88 static int flush_commit_list(struct super_block *s,
  89                              struct reiserfs_journal_list *jl, int flushall);
  90 static int can_dirty(struct reiserfs_journal_cnode *cn);
  91 static int journal_join(struct reiserfs_transaction_handle *th,
  92                         struct super_block *sb);
  93 static void release_journal_dev(struct super_block *super,
  94                                struct reiserfs_journal *journal);
  95 static void dirty_one_transaction(struct super_block *s,
  96                                  struct reiserfs_journal_list *jl);
  97 static void flush_async_commits(struct work_struct *work);
  98 static void queue_log_writer(struct super_block *s);
  99
 100 /* values for join in do_journal_begin_r */
 101 enum {
 102         JBEGIN_REG = 0,         /* regular journal begin */
 103         /* join the running transaction if at all possible */
 104         JBEGIN_JOIN = 1,
 105         /* called from cleanup code, ignores aborted flag */
 106         JBEGIN_ABORT = 2,
 107 };
 108
 109 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
 110                               struct super_block *sb,
 111                               unsigned long nblocks, int join);
 112
 113 static void init_journal_hash(struct super_block *sb)
 114 {
 115         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 116         memset(journal->j_hash_table, 0,
 117                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
 118 }
 119
 120 /*
 121  * clears BH_Dirty and sticks the buffer on the clean list.  Called because
 122  * I can't allow refile_buffer to make schedule happen after I've freed a
 123  * block.  Look at remove_from_transaction and journal_mark_freed for
 124  * more details.
 125  */
 126 static int reiserfs_clean_and_file_buffer(struct buffer_head *bh)
 127 {
 128         if (bh) {
 129                 clear_buffer_dirty(bh);
 130                 clear_buffer_journal_test(bh);
 131         }
 132         return 0;
 133 }
 134
 135 static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block
 136                                                          *sb)
 137 {
 138         struct reiserfs_bitmap_node *bn;
 139         static int id;
 140
 141         bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS);
 142         if (!bn) {
 143                 return NULL;
 144         }
 145         bn->data = kzalloc(sb->s_blocksize, GFP_NOFS);
 146         if (!bn->data) {
 147                 kfree(bn);
 148                 return NULL;
 149         }
 150         bn->id = id++;
 151         INIT_LIST_HEAD(&bn->list);
 152         return bn;
 153 }
 154
 155 static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb)
 156 {
 157         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 158         struct reiserfs_bitmap_node *bn = NULL;
 159         struct list_head *entry = journal->j_bitmap_nodes.next;
 160
 161         journal->j_used_bitmap_nodes++;
 162 repeat:
 163
 164         if (entry != &journal->j_bitmap_nodes) {
 165                 bn = list_entry(entry, struct reiserfs_bitmap_node, list);
 166                 list_del(entry);
 167                 memset(bn->data, 0, sb->s_blocksize);
 168                 journal->j_free_bitmap_nodes--;
 169                 return bn;
 170         }
 171         bn = allocate_bitmap_node(sb);
 172         if (!bn) {
 173                 yield();
 174                 goto repeat;
 175         }
 176         return bn;
 177 }
 178 static inline void free_bitmap_node(struct super_block *sb,
 179                                     struct reiserfs_bitmap_node *bn)
 180 {
 181         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 182         journal->j_used_bitmap_nodes--;
 183         if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) {
 184                 kfree(bn->data);
 185                 kfree(bn);
 186         } else {
 187                 list_add(&bn->list, &journal->j_bitmap_nodes);
 188                 journal->j_free_bitmap_nodes++;
 189         }
 190 }
 191
 192 static void allocate_bitmap_nodes(struct super_block *sb)
 193 {
 194         int i;
 195         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 196         struct reiserfs_bitmap_node *bn = NULL;
 197         for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) {
 198                 bn = allocate_bitmap_node(sb);
 199                 if (bn) {
 200                         list_add(&bn->list, &journal->j_bitmap_nodes);
 201                         journal->j_free_bitmap_nodes++;
 202                 } else {
 203                         /* this is ok, we'll try again when more are needed */
 204                         break;
 205                 }
 206         }
 207 }
 208
 209 static int set_bit_in_list_bitmap(struct super_block *sb,
 210                                   b_blocknr_t block,
 211                                   struct reiserfs_list_bitmap *jb)
 212 {
 213         unsigned int bmap_nr = block / (sb->s_blocksize << 3);
 214         unsigned int bit_nr = block % (sb->s_blocksize << 3);
 215
 216         if (!jb->bitmaps[bmap_nr]) {
 217                 jb->bitmaps[bmap_nr] = get_bitmap_node(sb);
 218         }
 219         set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data);
 220         return 0;
 221 }
 222
 223 static void cleanup_bitmap_list(struct super_block *sb,
 224                                 struct reiserfs_list_bitmap *jb)
 225 {
 226         int i;
 227         if (jb->bitmaps == NULL)
 228                 return;
 229
 230         for (i = 0; i < reiserfs_bmap_count(sb); i++) {
 231                 if (jb->bitmaps[i]) {
 232                         free_bitmap_node(sb, jb->bitmaps[i]);
 233                         jb->bitmaps[i] = NULL;
 234                 }
 235         }
 236 }
 237
 238 /*
 239  * only call this on FS unmount.
 240  */
 241 static int free_list_bitmaps(struct super_block *sb,
 242                              struct reiserfs_list_bitmap *jb_array)
 243 {
 244         int i;
 245         struct reiserfs_list_bitmap *jb;
 246         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 247                 jb = jb_array + i;
 248                 jb->journal_list = NULL;
 249                 cleanup_bitmap_list(sb, jb);
 250                 vfree(jb->bitmaps);
 251                 jb->bitmaps = NULL;
 252         }
 253         return 0;
 254 }
 255
 256 static int free_bitmap_nodes(struct super_block *sb)
 257 {
 258         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 259         struct list_head *next = journal->j_bitmap_nodes.next;
 260         struct reiserfs_bitmap_node *bn;
 261
 262         while (next != &journal->j_bitmap_nodes) {
 263                 bn = list_entry(next, struct reiserfs_bitmap_node, list);
 264                 list_del(next);
 265                 kfree(bn->data);
 266                 kfree(bn);
 267                 next = journal->j_bitmap_nodes.next;
 268                 journal->j_free_bitmap_nodes--;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /*
 275  * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps.
 276  * jb_array is the array to be filled in.
 277  */
 278 int reiserfs_allocate_list_bitmaps(struct super_block *sb,
 279                                    struct reiserfs_list_bitmap *jb_array,
 280                                    unsigned int bmap_nr)
 281 {
 282         int i;
 283         int failed = 0;
 284         struct reiserfs_list_bitmap *jb;
 285         int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *);
 286
 287         for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 288                 jb = jb_array + i;
 289                 jb->journal_list = NULL;
 290                 jb->bitmaps = vzalloc(mem);
 291                 if (!jb->bitmaps) {
 292                         reiserfs_warning(sb, "clm-2000", "unable to "
 293                                          "allocate bitmaps for journal lists");
 294                         failed = 1;
 295                         break;
 296                 }
 297         }
 298         if (failed) {
 299                 free_list_bitmaps(sb, jb_array);
 300                 return -1;
 301         }
 302         return 0;
 303 }
 304
 305 /*
 306  * find an available list bitmap.  If you can't find one, flush a commit list
 307  * and try again
 308  */
 309 static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb,
 310                                                     struct reiserfs_journal_list
 311                                                     *jl)
 312 {
 313         int i, j;
 314         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 315         struct reiserfs_list_bitmap *jb = NULL;
 316
 317         for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) {
 318                 i = journal->j_list_bitmap_index;
 319                 journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS;
 320                 jb = journal->j_list_bitmap + i;
 321                 if (journal->j_list_bitmap[i].journal_list) {
 322                         flush_commit_list(sb,
 323                                           journal->j_list_bitmap[i].
 324                                           journal_list, 1);
 325                         if (!journal->j_list_bitmap[i].journal_list) {
 326                                 break;
 327                         }
 328                 } else {
 329                         break;
 330                 }
 331         }
 332         /* double check to make sure if flushed correctly */
 333         if (jb->journal_list)
 334                 return NULL;
 335         jb->journal_list = jl;
 336         return jb;
 337 }
 338
 339 /*
 340  * allocates a new chunk of X nodes, and links them all together as a list.
 341  * Uses the cnode->next and cnode->prev pointers
 342  * returns NULL on failure
 343  */
 344 static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes)
 345 {
 346         struct reiserfs_journal_cnode *head;
 347         int i;
 348         if (num_cnodes <= 0) {
 349                 return NULL;
 350         }
 351         head = vzalloc(array_size(num_cnodes,
 352                                   sizeof(struct reiserfs_journal_cnode)));
 353         if (!head) {
 354                 return NULL;
 355         }
 356         head[0].prev = NULL;
 357         head[0].next = head + 1;
 358         for (i = 1; i < num_cnodes; i++) {
 359                 head[i].prev = head + (i - 1);
 360                 head[i].next = head + (i + 1);  /* if last one, overwrite it after the if */
 361         }
 362         head[num_cnodes - 1].next = NULL;
 363         return head;
 364 }
 365
 366 /* pulls a cnode off the free list, or returns NULL on failure */
 367 static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb)
 368 {
 369         struct reiserfs_journal_cnode *cn;
 370         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 371
 372         reiserfs_check_lock_depth(sb, "get_cnode");
 373
 374         if (journal->j_cnode_free <= 0) {
 375                 return NULL;
 376         }
 377         journal->j_cnode_used++;
 378         journal->j_cnode_free--;
 379         cn = journal->j_cnode_free_list;
 380         if (!cn) {
 381                 return cn;
 382         }
 383         if (cn->next) {
 384                 cn->next->prev = NULL;
 385         }
 386         journal->j_cnode_free_list = cn->next;
 387         memset(cn, 0, sizeof(struct reiserfs_journal_cnode));
 388         return cn;
 389 }
 390
 391 /*
 392  * returns a cnode to the free list
 393  */
 394 static void free_cnode(struct super_block *sb,
 395                        struct reiserfs_journal_cnode *cn)
 396 {
 397         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 398
 399         reiserfs_check_lock_depth(sb, "free_cnode");
 400
 401         journal->j_cnode_used--;
 402         journal->j_cnode_free++;
 403         /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */
 404         cn->next = journal->j_cnode_free_list;
 405         if (journal->j_cnode_free_list) {
 406                 journal->j_cnode_free_list->prev = cn;
 407         }
 408         cn->prev = NULL;        /* not needed with the memset, but I might kill the memset, and forget to do this */
 409         journal->j_cnode_free_list = cn;
 410 }
 411
 412 static void clear_prepared_bits(struct buffer_head *bh)
 413 {
 414         clear_buffer_journal_prepared(bh);
 415         clear_buffer_journal_restore_dirty(bh);
 416 }
 417
 418 /*
 419  * return a cnode with same dev, block number and size in table,
 420  * or null if not found
 421  */
 422 static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct
 423                                                                   super_block
 424                                                                   *sb,
 425                                                                   struct
 426                                                                   reiserfs_journal_cnode
 427                                                                   **table,
 428                                                                   long bl)
 429 {
 430         struct reiserfs_journal_cnode *cn;
 431         cn = journal_hash(table, sb, bl);
 432         while (cn) {
 433                 if (cn->blocknr == bl && cn->sb == sb)
 434                         return cn;
 435                 cn = cn->hnext;
 436         }
 437         return (struct reiserfs_journal_cnode *)0;
 438 }
 439
 440 /*
 441  * this actually means 'can this block be reallocated yet?'.  If you set
 442  * search_all, a block can only be allocated if it is not in the current
 443  * transaction, was not freed by the current transaction, and has no chance
 444  * of ever being overwritten by a replay after crashing.
 445  *
 446  * If you don't set search_all, a block can only be allocated if it is not
 447  * in the current transaction.  Since deleting a block removes it from the
 448  * current transaction, this case should never happen.  If you don't set
 449  * search_all, make sure you never write the block without logging it.
 450  *
 451  * next_zero_bit is a suggestion about the next block to try for find_forward.
 452  * when bl is rejected because it is set in a journal list bitmap, we search
 453  * for the next zero bit in the bitmap that rejected bl.  Then, we return
 454  * that through next_zero_bit for find_forward to try.
 455  *
 456  * Just because we return something in next_zero_bit does not mean we won't
 457  * reject it on the next call to reiserfs_in_journal
 458  */
 459 int reiserfs_in_journal(struct super_block *sb,
 460                         unsigned int bmap_nr, int bit_nr, int search_all,
 461                         b_blocknr_t * next_zero_bit)
 462 {
 463         struct reiserfs_journal *journal = SB_JOURNAL(sb);
 464         struct reiserfs_journal_cnode *cn;
 465         struct reiserfs_list_bitmap *jb;
 466         int i;
 467         unsigned long bl;
 468
 469         *next_zero_bit = 0;     /* always start this at zero. */
 470
 471         PROC_INFO_INC(sb, journal.in_journal);
 472         /*
 473          * If we aren't doing a search_all, this is a metablock, and it
 474          * will be logged before use.  if we crash before the transaction
 475          * that freed it commits,  this transaction won't have committed
 476          * either, and the block will never be written
 477          */
 478         if (search_all) {
 479                 for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
 480                         PROC_INFO_INC(sb, journal.in_journal_bitmap);
 481                         jb = journal->j_list_bitmap + i;
 482                         if (jb->journal_list && jb->bitmaps[bmap_nr] &&
 483                             test_bit(bit_nr,
 484                                      (unsigned long *)jb->bitmaps[bmap_nr]->
 485                                      data)) {
 486                                 *next_zero_bit =
 487                                     find_next_zero_bit((unsigned long *)
 488                                                        (jb->bitmaps[bmap_nr]->
 489                                                         data),
 490                                                        sb->s_blocksize << 3,
 491                                                        bit_nr + 1);
 492                                 return 1;
 493                         }
 494                 }
 495         }
 496
 497         bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr;
 498         /* is it in any old transactions? */
 499         if (search_all
 500             && (cn =
 501                 get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) {
 502                 return 1;
 503         }
 504
 505         /* is it in the current transaction.  This should never happen */
 506         if ((cn = get_journal_hash_dev(sb, journal->j_hash_table, bl))) {
 507                 BUG();
 508                 return 1;
 509         }
 510
 511         PROC_INFO_INC(sb, journal.in_journal_reusable);
 512         /* safe for reuse */
 513         return 0;
 514 }
 515
 516 /* insert cn into table */
 517 static inline void insert_journal_hash(struct reiserfs_journal_cnode **table,
 518                                        struct reiserfs_journal_cnode *cn)
 519 {
 520         struct reiserfs_journal_cnode *cn_orig;
 521
 522         cn_orig = journal_hash(table, cn->sb, cn->blocknr);
 523         cn->hnext = cn_orig;
 524         cn->hprev = NULL;
 525         if (cn_orig) {
 526                 cn_orig->hprev = cn;
 527         }
 528         journal_hash(table, cn->sb, cn->blocknr) = cn;
 529 }
 530
 531 /* lock the current transaction */
 532 static inline void lock_journal(struct super_block *sb)
 533 {
 534         PROC_INFO_INC(sb, journal.lock_journal);
 535
 536         reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb);
 537 }
 538
 539 /* unlock the current transaction */
 540 static inline void unlock_journal(struct super_block *sb)
 541 {
 542         mutex_unlock(&SB_JOURNAL(sb)->j_mutex);
 543 }
 544
 545 static inline void get_journal_list(struct reiserfs_journal_list *jl)
 546 {
 547         jl->j_refcount++;
 548 }
 549
 550 static inline void put_journal_list(struct super_block *s,
 551                                     struct reiserfs_journal_list *jl)
 552 {
 553         if (jl->j_refcount < 1) {
 554                 reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d",
 555                                jl->j_trans_id, jl->j_refcount);
 556         }
 557         if (--jl->j_refcount == 0)
 558                 kfree(jl);
 559 }
 560
 561 /*
 562  * this used to be much more involved, and I'm keeping it just in case
 563  * things get ugly again.  it gets called by flush_commit_list, and
 564  * cleans up any data stored about blocks freed during a transaction.
 565  */
 566 static void cleanup_freed_for_journal_list(struct super_block *sb,
 567                                            struct reiserfs_journal_list *jl)
 568 {
 569
 570         struct reiserfs_list_bitmap *jb = jl->j_list_bitmap;
 571         if (jb) {
 572                 cleanup_bitmap_list(sb, jb);
 573         }
 574         jl->j_list_bitmap->journal_list = NULL;
 575         jl->j_list_bitmap = NULL;
 576 }
 577
 578 static int journal_list_still_alive(struct super_block *s,
 579                                     unsigned int trans_id)
 580 {
 581         struct reiserfs_journal *journal = SB_JOURNAL(s);
 582         struct list_head *entry = &journal->j_journal_list;
 583         struct reiserfs_journal_list *jl;
 584
 585         if (!list_empty(entry)) {
 586                 jl = JOURNAL_LIST_ENTRY(entry->next);
 587                 if (jl->j_trans_id <= trans_id) {
 588                         return 1;
 589                 }
 590         }
 591         return 0;
 592 }
 593
 594 /*
 595  * If page->mapping was null, we failed to truncate this page for
 596  * some reason.  Most likely because it was truncated after being
 597  * logged via data=journal.
 598  *
 599  * This does a check to see if the buffer belongs to one of these
 600  * lost pages before doing the final put_bh.  If page->mapping was
 601  * null, it tries to free buffers on the page, which should make the
 602  * final put_page drop the page from the lru.
 603  */
 604 static void release_buffer_page(struct buffer_head *bh)
 605 {
 606         struct page *page = bh->b_page;
 607         if (!page->mapping && trylock_page(page)) {
 608                 get_page(page);
 609                 put_bh(bh);
 610                 if (!page->mapping)
 611                         try_to_free_buffers(page);
 612                 unlock_page(page);
 613                 put_page(page);
 614         } else {
 615                 put_bh(bh);
 616         }
 617 }
 618
 619 static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
 620 {
 621         if (buffer_journaled(bh)) {
 622                 reiserfs_warning(NULL, "clm-2084",
 623                                  "pinned buffer %lu:%pg sent to disk",
 624                                  bh->b_blocknr, bh->b_bdev);
 625         }
 626         if (uptodate)
 627                 set_buffer_uptodate(bh);
 628         else
 629                 clear_buffer_uptodate(bh);
 630
 631         unlock_buffer(bh);
 632         release_buffer_page(bh);
 633 }
 634
 635 static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate)
 636 {
 637         if (uptodate)
 638                 set_buffer_uptodate(bh);
 639         else
 640                 clear_buffer_uptodate(bh);
 641         unlock_buffer(bh);
 642         put_bh(bh);
 643 }
 644
 645 static void submit_logged_buffer(struct buffer_head *bh)
 646 {
 647         get_bh(bh);
 648         bh->b_end_io = reiserfs_end_buffer_io_sync;
 649         clear_buffer_journal_new(bh);
 650         clear_buffer_dirty(bh);
 651         if (!test_clear_buffer_journal_test(bh))
 652                 BUG();
 653         if (!buffer_uptodate(bh))
 654                 BUG();
 655         submit_bh(REQ_OP_WRITE, 0, bh);
 656 }
 657
 658 static void submit_ordered_buffer(struct buffer_head *bh)
 659 {
 660         get_bh(bh);
 661         bh->b_end_io = reiserfs_end_ordered_io;
 662         clear_buffer_dirty(bh);
 663         if (!buffer_uptodate(bh))
 664                 BUG();
 665         submit_bh(REQ_OP_WRITE, 0, bh);
 666 }
 667
 668 #define CHUNK_SIZE 32
 669 struct buffer_chunk {
 670         struct buffer_head *bh[CHUNK_SIZE];
 671         int nr;
 672 };
 673
 674 static void write_chunk(struct buffer_chunk *chunk)
 675 {
 676         int i;
 677         for (i = 0; i < chunk->nr; i++) {
 678                 submit_logged_buffer(chunk->bh[i]);
 679         }
 680         chunk->nr = 0;
 681 }
 682
 683 static void write_ordered_chunk(struct buffer_chunk *chunk)
 684 {
 685         int i;
 686         for (i = 0; i < chunk->nr; i++) {
 687                 submit_ordered_buffer(chunk->bh[i]);
 688         }
 689         chunk->nr = 0;
 690 }
 691
 692 static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh,
 693                         spinlock_t * lock, void (fn) (struct buffer_chunk *))
 694 {
 695         int ret = 0;
 696         BUG_ON(chunk->nr >= CHUNK_SIZE);
 697         chunk->bh[chunk->nr++] = bh;
 698         if (chunk->nr >= CHUNK_SIZE) {
 699                 ret = 1;
 700                 if (lock) {
 701                         spin_unlock(lock);
 702                         fn(chunk);
 703                         spin_lock(lock);
 704                 } else {
 705                         fn(chunk);
 706                 }
 707         }
 708         return ret;
 709 }
 710
 711 static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0);
 712 static struct reiserfs_jh *alloc_jh(void)
 713 {
 714         struct reiserfs_jh *jh;
 715         while (1) {
 716                 jh = kmalloc(sizeof(*jh), GFP_NOFS);
 717                 if (jh) {
 718                         atomic_inc(&nr_reiserfs_jh);
 719                         return jh;
 720                 }
 721                 yield();
 722         }
 723 }
 724
 725 /*
 726  * we want to free the jh when the buffer has been written
 727  * and waited on
 728  */
 729 void reiserfs_free_jh(struct buffer_head *bh)
 730 {
 731         struct reiserfs_jh *jh;
 732
 733         jh = bh->b_private;
 734         if (jh) {
 735                 bh->b_private = NULL;
 736                 jh->bh = NULL;
 737                 list_del_init(&jh->list);
 738                 kfree(jh);
 739                 if (atomic_read(&nr_reiserfs_jh) <= 0)
 740                         BUG();
 741                 atomic_dec(&nr_reiserfs_jh);
 742                 put_bh(bh);
 743         }
 744 }
 745
 746 static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh,
 747                            int tail)
 748 {
 749         struct reiserfs_jh *jh;
 750
 751         if (bh->b_private) {
 752                 spin_lock(&j->j_dirty_buffers_lock);
 753                 if (!bh->b_private) {
 754                         spin_unlock(&j->j_dirty_buffers_lock);
 755                         goto no_jh;
 756                 }
 757                 jh = bh->b_private;
 758                 list_del_init(&jh->list);
 759         } else {
 760 no_jh:
 761                 get_bh(bh);
 762                 jh = alloc_jh();
 763                 spin_lock(&j->j_dirty_buffers_lock);
 764                 /*
 765                  * buffer must be locked for __add_jh, should be able to have
 766                  * two adds at the same time
 767                  */
 768                 BUG_ON(bh->b_private);
 769                 jh->bh = bh;
 770                 bh->b_private = jh;
 771         }
 772         jh->jl = j->j_current_jl;
 773         if (tail)
 774                 list_add_tail(&jh->list, &jh->jl->j_tail_bh_list);
 775         else {
 776                 list_add_tail(&jh->list, &jh->jl->j_bh_list);
 777         }
 778         spin_unlock(&j->j_dirty_buffers_lock);
 779         return 0;
 780 }
 781
 782 int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh)
 783 {
 784         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1);
 785 }
 786 int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh)
 787 {
 788         return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0);
 789 }
 790
 791 #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list)
 792 static int write_ordered_buffers(spinlock_t * lock,
 793                                  struct reiserfs_journal *j,
 794                                  struct reiserfs_journal_list *jl,
 795                                  struct list_head *list)
 796 {
 797         struct buffer_head *bh;
 798         struct reiserfs_jh *jh;
 799         int ret = j->j_errno;
 800         struct buffer_chunk chunk;
 801         struct list_head tmp;
 802         INIT_LIST_HEAD(&tmp);
 803
 804         chunk.nr = 0;
 805         spin_lock(lock);
 806         while (!list_empty(list)) {
 807                 jh = JH_ENTRY(list->next);
 808                 bh = jh->bh;
 809                 get_bh(bh);
 810                 if (!trylock_buffer(bh)) {
 811                         if (!buffer_dirty(bh)) {
 812                                 list_move(&jh->list, &tmp);
 813                                 goto loop_next;
 814                         }
 815                         spin_unlock(lock);
 816                         if (chunk.nr)
 817                                 write_ordered_chunk(&chunk);
 818                         wait_on_buffer(bh);
 819                         cond_resched();
 820                         spin_lock(lock);
 821                         goto loop_next;
 822                 }
 823                 /*
 824                  * in theory, dirty non-uptodate buffers should never get here,
 825                  * but the upper layer io error paths still have a few quirks.
 826                  * Handle them here as gracefully as we can
 827                  */
 828                 if (!buffer_uptodate(bh) && buffer_dirty(bh)) {
 829                         clear_buffer_dirty(bh);
 830                         ret = -EIO;
 831                 }
 832                 if (buffer_dirty(bh)) {
 833                         list_move(&jh->list, &tmp);
 834                         add_to_chunk(&chunk, bh, lock, write_ordered_chunk);
 835                 } else {
 836                         reiserfs_free_jh(bh);
 837                         unlock_buffer(bh);
 838                 }
 839 loop_next:
 840                 put_bh(bh);
 841                 cond_resched_lock(lock);
 842         }
 843         if (chunk.nr) {
 844                 spin_unlock(lock);
 845                 write_ordered_chunk(&chunk);
 846                 spin_lock(lock);
 847         }
 848         while (!list_empty(&tmp)) {
 849                 jh = JH_ENTRY(tmp.prev);
 850                 bh = jh->bh;
 851                 get_bh(bh);
 852                 reiserfs_free_jh(bh);
 853
 854                 if (buffer_locked(bh)) {
 855                         spin_unlock(lock);
 856                         wait_on_buffer(bh);
 857                         spin_lock(lock);
 858                 }
 859                 if (!buffer_uptodate(bh)) {
 860                         ret = -EIO;
 861                 }
 862                 /*
 863                  * ugly interaction with invalidatepage here.
 864                  * reiserfs_invalidate_page will pin any buffer that has a
 865                  * valid journal head from an older transaction.  If someone
 866                  * else sets our buffer dirty after we write it in the first
 867                  * loop, and then someone truncates the page away, nobody
 868                  * will ever write the buffer. We're safe if we write the
 869                  * page one last time after freeing the journal header.
 870                  */
 871                 if (buffer_dirty(bh) && unlikely(bh->b_page->mapping == NULL)) {
 872                         spin_unlock(lock);
 873                         ll_rw_block(REQ_OP_WRITE, 0, 1, &bh);
 874                         spin_lock(lock);
 875                 }
 876                 put_bh(bh);
 877                 cond_resched_lock(lock);
 878         }
 879         spin_unlock(lock);
 880         return ret;
 881 }
 882
 883 static int flush_older_commits(struct super_block *s,
 884                                struct reiserfs_journal_list *jl)
 885 {
 886         struct reiserfs_journal *journal = SB_JOURNAL(s);
 887         struct reiserfs_journal_list *other_jl;
 888         struct reiserfs_journal_list *first_jl;
 889         struct list_head *entry;
 890         unsigned int trans_id = jl->j_trans_id;
 891         unsigned int other_trans_id;
 892
 893 find_first:
 894         /*
 895          * first we walk backwards to find the oldest uncommitted transation
 896          */
 897         first_jl = jl;
 898         entry = jl->j_list.prev;
 899         while (1) {
 900                 other_jl = JOURNAL_LIST_ENTRY(entry);
 901                 if (entry == &journal->j_journal_list ||
 902                     atomic_read(&other_jl->j_older_commits_done))
 903                         break;
 904
 905                 first_jl = other_jl;
 906                 entry = other_jl->j_list.prev;
 907         }
 908
 909         /* if we didn't find any older uncommitted transactions, return now */
 910         if (first_jl == jl) {
 911                 return 0;
 912         }
 913
 914         entry = &first_jl->j_list;
 915         while (1) {
 916                 other_jl = JOURNAL_LIST_ENTRY(entry);
 917                 other_trans_id = other_jl->j_trans_id;
 918
 919                 if (other_trans_id < trans_id) {
 920                         if (atomic_read(&other_jl->j_commit_left) != 0) {
 921                                 flush_commit_list(s, other_jl, 0);
 922
 923                                 /* list we were called with is gone, return */
 924                                 if (!journal_list_still_alive(s, trans_id))
 925                                         return 1;
 926
 927                                 /*
 928                                  * the one we just flushed is gone, this means
 929                                  * all older lists are also gone, so first_jl
 930                                  * is no longer valid either.  Go back to the
 931                                  * beginning.
 932                                  */
 933                                 if (!journal_list_still_alive
 934                                     (s, other_trans_id)) {
 935                                         goto find_first;
 936                                 }
 937                         }
 938                         entry = entry->next;
 939                         if (entry == &journal->j_journal_list)
 940                                 return 0;
 941                 } else {
 942                         return 0;
 943                 }
 944         }
 945         return 0;
 946 }
 947
 948 static int reiserfs_async_progress_wait(struct super_block *s)
 949 {
 950         struct reiserfs_journal *j = SB_JOURNAL(s);
 951
 952         if (atomic_read(&j->j_async_throttle)) {
 953                 int depth;
 954
 955                 depth = reiserfs_write_unlock_nested(s);
 956                 congestion_wait(BLK_RW_ASYNC, HZ / 10);
 957                 reiserfs_write_lock_nested(s, depth);
 958         }
 959
 960         return 0;
 961 }
 962
 963 /*
 964  * if this journal list still has commit blocks unflushed, send them to disk.
 965  *
 966  * log areas must be flushed in order (transaction 2 can't commit before
 967  * transaction 1) Before the commit block can by written, every other log
 968  * block must be safely on disk
 969  */
 970 static int flush_commit_list(struct super_block *s,
 971                              struct reiserfs_journal_list *jl, int flushall)
 972 {
 973         int i;
 974         b_blocknr_t bn;
 975         struct buffer_head *tbh = NULL;
 976         unsigned int trans_id = jl->j_trans_id;
 977         struct reiserfs_journal *journal = SB_JOURNAL(s);
 978         int retval = 0;
 979         int write_len;
 980         int depth;
 981
 982         reiserfs_check_lock_depth(s, "flush_commit_list");
 983
 984         if (atomic_read(&jl->j_older_commits_done)) {
 985                 return 0;
 986         }
 987
 988         /*
 989          * before we can put our commit blocks on disk, we have to make
 990          * sure everyone older than us is on disk too
 991          */
 992         BUG_ON(jl->j_len <= 0);
 993         BUG_ON(trans_id == journal->j_trans_id);
 994
 995         get_journal_list(jl);
 996         if (flushall) {
 997                 if (flush_older_commits(s, jl) == 1) {
 998                         /*
 999                          * list disappeared during flush_older_commits.
1000                          * return
1001                          */
1002                         goto put_jl;
1003                 }
1004         }
1005
1006         /* make sure nobody is trying to flush this one at the same time */
1007         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s);
1008
1009         if (!journal_list_still_alive(s, trans_id)) {
1010                 mutex_unlock(&jl->j_commit_mutex);
1011                 goto put_jl;
1012         }
1013         BUG_ON(jl->j_trans_id == 0);
1014
1015         /* this commit is done, exit */
1016         if (atomic_read(&jl->j_commit_left) <= 0) {
1017                 if (flushall) {
1018                         atomic_set(&jl->j_older_commits_done, 1);
1019                 }
1020                 mutex_unlock(&jl->j_commit_mutex);
1021                 goto put_jl;
1022         }
1023
1024         if (!list_empty(&jl->j_bh_list)) {
1025                 int ret;
1026
1027                 /*
1028                  * We might sleep in numerous places inside
1029                  * write_ordered_buffers. Relax the write lock.
1030                  */
1031                 depth = reiserfs_write_unlock_nested(s);
1032                 ret = write_ordered_buffers(&journal->j_dirty_buffers_lock,
1033                                             journal, jl, &jl->j_bh_list);
1034                 if (ret < 0 && retval == 0)
1035                         retval = ret;
1036                 reiserfs_write_lock_nested(s, depth);
1037         }
1038         BUG_ON(!list_empty(&jl->j_bh_list));
1039         /*
1040          * for the description block and all the log blocks, submit any buffers
1041          * that haven't already reached the disk.  Try to write at least 256
1042          * log blocks. later on, we will only wait on blocks that correspond
1043          * to this transaction, but while we're unplugging we might as well
1044          * get a chunk of data on there.
1045          */
1046         atomic_inc(&journal->j_async_throttle);
1047         write_len = jl->j_len + 1;
1048         if (write_len < 256)
1049                 write_len = 256;
1050         for (i = 0 ; i < write_len ; i++) {
1051                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) %
1052                     SB_ONDISK_JOURNAL_SIZE(s);
1053                 tbh = journal_find_get_block(s, bn);
1054                 if (tbh) {
1055                         if (buffer_dirty(tbh)) {
1056                             depth = reiserfs_write_unlock_nested(s);
1057                             ll_rw_block(REQ_OP_WRITE, 0, 1, &tbh);
1058                             reiserfs_write_lock_nested(s, depth);
1059                         }
1060                         put_bh(tbh) ;
1061                 }
1062         }
1063         atomic_dec(&journal->j_async_throttle);
1064
1065         for (i = 0; i < (jl->j_len + 1); i++) {
1066                 bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) +
1067                     (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s);
1068                 tbh = journal_find_get_block(s, bn);
1069
1070                 depth = reiserfs_write_unlock_nested(s);
1071                 __wait_on_buffer(tbh);
1072                 reiserfs_write_lock_nested(s, depth);
1073                 /*
1074                  * since we're using ll_rw_blk above, it might have skipped
1075                  * over a locked buffer.  Double check here
1076                  */
1077                 /* redundant, sync_dirty_buffer() checks */
1078                 if (buffer_dirty(tbh)) {
1079                         depth = reiserfs_write_unlock_nested(s);
1080                         sync_dirty_buffer(tbh);
1081                         reiserfs_write_lock_nested(s, depth);
1082                 }
1083                 if (unlikely(!buffer_uptodate(tbh))) {
1084 #ifdef CONFIG_REISERFS_CHECK
1085                         reiserfs_warning(s, "journal-601",
1086                                          "buffer write failed");
1087 #endif
1088                         retval = -EIO;
1089                 }
1090                 /* once for journal_find_get_block */
1091                 put_bh(tbh);
1092                 /* once due to original getblk in do_journal_end */
1093                 put_bh(tbh);
1094                 atomic_dec(&jl->j_commit_left);
1095         }
1096
1097         BUG_ON(atomic_read(&jl->j_commit_left) != 1);
1098
1099         /*
1100          * If there was a write error in the journal - we can't commit
1101          * this transaction - it will be invalid and, if successful,
1102          * will just end up propagating the write error out to
1103          * the file system.
1104          */
1105         if (likely(!retval && !reiserfs_is_journal_aborted (journal))) {
1106                 if (buffer_dirty(jl->j_commit_bh))
1107                         BUG();
1108                 mark_buffer_dirty(jl->j_commit_bh) ;
1109                 depth = reiserfs_write_unlock_nested(s);
1110                 if (reiserfs_barrier_flush(s))
1111                         __sync_dirty_buffer(jl->j_commit_bh,
1112                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1113                 else
1114                         sync_dirty_buffer(jl->j_commit_bh);
1115                 reiserfs_write_lock_nested(s, depth);
1116         }
1117
1118         /*
1119          * If there was a write error in the journal - we can't commit this
1120          * transaction - it will be invalid and, if successful, will just end
1121          * up propagating the write error out to the filesystem.
1122          */
1123         if (unlikely(!buffer_uptodate(jl->j_commit_bh))) {
1124 #ifdef CONFIG_REISERFS_CHECK
1125                 reiserfs_warning(s, "journal-615", "buffer write failed");
1126 #endif
1127                 retval = -EIO;
1128         }
1129         bforget(jl->j_commit_bh);
1130         if (journal->j_last_commit_id != 0 &&
1131             (jl->j_trans_id - journal->j_last_commit_id) != 1) {
1132                 reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu",
1133                                  journal->j_last_commit_id, jl->j_trans_id);
1134         }
1135         journal->j_last_commit_id = jl->j_trans_id;
1136
1137         /*
1138          * now, every commit block is on the disk.  It is safe to allow
1139          * blocks freed during this transaction to be reallocated
1140          */
1141         cleanup_freed_for_journal_list(s, jl);
1142
1143         retval = retval ? retval : journal->j_errno;
1144
1145         /* mark the metadata dirty */
1146         if (!retval)
1147                 dirty_one_transaction(s, jl);
1148         atomic_dec(&jl->j_commit_left);
1149
1150         if (flushall) {
1151                 atomic_set(&jl->j_older_commits_done, 1);
1152         }
1153         mutex_unlock(&jl->j_commit_mutex);
1154 put_jl:
1155         put_journal_list(s, jl);
1156
1157         if (retval)
1158                 reiserfs_abort(s, retval, "Journal write error in %s",
1159                                __func__);
1160         return retval;
1161 }
1162
1163 /*
1164  * flush_journal_list frequently needs to find a newer transaction for a
1165  * given block.  This does that, or returns NULL if it can't find anything
1166  */
1167 static struct reiserfs_journal_list *find_newer_jl_for_cn(struct
1168                                                           reiserfs_journal_cnode
1169                                                           *cn)
1170 {
1171         struct super_block *sb = cn->sb;
1172         b_blocknr_t blocknr = cn->blocknr;
1173
1174         cn = cn->hprev;
1175         while (cn) {
1176                 if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) {
1177                         return cn->jlist;
1178                 }
1179                 cn = cn->hprev;
1180         }
1181         return NULL;
1182 }
1183
1184 static void remove_journal_hash(struct super_block *,
1185                                 struct reiserfs_journal_cnode **,
1186                                 struct reiserfs_journal_list *, unsigned long,
1187                                 int);
1188
1189 /*
1190  * once all the real blocks have been flushed, it is safe to remove them
1191  * from the journal list for this transaction.  Aside from freeing the
1192  * cnode, this also allows the block to be reallocated for data blocks
1193  * if it had been deleted.
1194  */
1195 static void remove_all_from_journal_list(struct super_block *sb,
1196                                          struct reiserfs_journal_list *jl,
1197                                          int debug)
1198 {
1199         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1200         struct reiserfs_journal_cnode *cn, *last;
1201         cn = jl->j_realblock;
1202
1203         /*
1204          * which is better, to lock once around the whole loop, or
1205          * to lock for each call to remove_journal_hash?
1206          */
1207         while (cn) {
1208                 if (cn->blocknr != 0) {
1209                         if (debug) {
1210                                 reiserfs_warning(sb, "reiserfs-2201",
1211                                                  "block %u, bh is %d, state %ld",
1212                                                  cn->blocknr, cn->bh ? 1 : 0,
1213                                                  cn->state);
1214                         }
1215                         cn->state = 0;
1216                         remove_journal_hash(sb, journal->j_list_hash_table,
1217                                             jl, cn->blocknr, 1);
1218                 }
1219                 last = cn;
1220                 cn = cn->next;
1221                 free_cnode(sb, last);
1222         }
1223         jl->j_realblock = NULL;
1224 }
1225
1226 /*
1227  * if this timestamp is greater than the timestamp we wrote last to the
1228  * header block, write it to the header block.  once this is done, I can
1229  * safely say the log area for this transaction won't ever be replayed,
1230  * and I can start releasing blocks in this transaction for reuse as data
1231  * blocks.  called by flush_journal_list, before it calls
1232  * remove_all_from_journal_list
1233  */
1234 static int _update_journal_header_block(struct super_block *sb,
1235                                         unsigned long offset,
1236                                         unsigned int trans_id)
1237 {
1238         struct reiserfs_journal_header *jh;
1239         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1240         int depth;
1241
1242         if (reiserfs_is_journal_aborted(journal))
1243                 return -EIO;
1244
1245         if (trans_id >= journal->j_last_flush_trans_id) {
1246                 if (buffer_locked((journal->j_header_bh))) {
1247                         depth = reiserfs_write_unlock_nested(sb);
1248                         __wait_on_buffer(journal->j_header_bh);
1249                         reiserfs_write_lock_nested(sb, depth);
1250                         if (unlikely(!buffer_uptodate(journal->j_header_bh))) {
1251 #ifdef CONFIG_REISERFS_CHECK
1252                                 reiserfs_warning(sb, "journal-699",
1253                                                  "buffer write failed");
1254 #endif
1255                                 return -EIO;
1256                         }
1257                 }
1258                 journal->j_last_flush_trans_id = trans_id;
1259                 journal->j_first_unflushed_offset = offset;
1260                 jh = (struct reiserfs_journal_header *)(journal->j_header_bh->
1261                                                         b_data);
1262                 jh->j_last_flush_trans_id = cpu_to_le32(trans_id);
1263                 jh->j_first_unflushed_offset = cpu_to_le32(offset);
1264                 jh->j_mount_id = cpu_to_le32(journal->j_mount_id);
1265
1266                 set_buffer_dirty(journal->j_header_bh);
1267                 depth = reiserfs_write_unlock_nested(sb);
1268
1269                 if (reiserfs_barrier_flush(sb))
1270                         __sync_dirty_buffer(journal->j_header_bh,
1271                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
1272                 else
1273                         sync_dirty_buffer(journal->j_header_bh);
1274
1275                 reiserfs_write_lock_nested(sb, depth);
1276                 if (!buffer_uptodate(journal->j_header_bh)) {
1277                         reiserfs_warning(sb, "journal-837",
1278                                          "IO error during journal replay");
1279                         return -EIO;
1280                 }
1281         }
1282         return 0;
1283 }
1284
1285 static int update_journal_header_block(struct super_block *sb,
1286                                        unsigned long offset,
1287                                        unsigned int trans_id)
1288 {
1289         return _update_journal_header_block(sb, offset, trans_id);
1290 }
1291
1292 /*
1293 ** flush any and all journal lists older than you are
1294 ** can only be called from flush_journal_list
1295 */
1296 static int flush_older_journal_lists(struct super_block *sb,
1297                                      struct reiserfs_journal_list *jl)
1298 {
1299         struct list_head *entry;
1300         struct reiserfs_journal_list *other_jl;
1301         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1302         unsigned int trans_id = jl->j_trans_id;
1303
1304         /*
1305          * we know we are the only ones flushing things, no extra race
1306          * protection is required.
1307          */
1308 restart:
1309         entry = journal->j_journal_list.next;
1310         /* Did we wrap? */
1311         if (entry == &journal->j_journal_list)
1312                 return 0;
1313         other_jl = JOURNAL_LIST_ENTRY(entry);
1314         if (other_jl->j_trans_id < trans_id) {
1315                 BUG_ON(other_jl->j_refcount <= 0);
1316                 /* do not flush all */
1317                 flush_journal_list(sb, other_jl, 0);
1318
1319                 /* other_jl is now deleted from the list */
1320                 goto restart;
1321         }
1322         return 0;
1323 }
1324
1325 static void del_from_work_list(struct super_block *s,
1326                                struct reiserfs_journal_list *jl)
1327 {
1328         struct reiserfs_journal *journal = SB_JOURNAL(s);
1329         if (!list_empty(&jl->j_working_list)) {
1330                 list_del_init(&jl->j_working_list);
1331                 journal->j_num_work_lists--;
1332         }
1333 }
1334
1335 /*
1336  * flush a journal list, both commit and real blocks
1337  *
1338  * always set flushall to 1, unless you are calling from inside
1339  * flush_journal_list
1340  *
1341  * IMPORTANT.  This can only be called while there are no journal writers,
1342  * and the journal is locked.  That means it can only be called from
1343  * do_journal_end, or by journal_release
1344  */
1345 static int flush_journal_list(struct super_block *s,
1346                               struct reiserfs_journal_list *jl, int flushall)
1347 {
1348         struct reiserfs_journal_list *pjl;
1349         struct reiserfs_journal_cnode *cn;
1350         int count;
1351         int was_jwait = 0;
1352         int was_dirty = 0;
1353         struct buffer_head *saved_bh;
1354         unsigned long j_len_saved = jl->j_len;
1355         struct reiserfs_journal *journal = SB_JOURNAL(s);
1356         int err = 0;
1357         int depth;
1358
1359         BUG_ON(j_len_saved <= 0);
1360
1361         if (atomic_read(&journal->j_wcount) != 0) {
1362                 reiserfs_warning(s, "clm-2048", "called with wcount %d",
1363                                  atomic_read(&journal->j_wcount));
1364         }
1365
1366         /* if flushall == 0, the lock is already held */
1367         if (flushall) {
1368                 reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1369         } else if (mutex_trylock(&journal->j_flush_mutex)) {
1370                 BUG();
1371         }
1372
1373         count = 0;
1374         if (j_len_saved > journal->j_trans_max) {
1375                 reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu",
1376                                j_len_saved, jl->j_trans_id);
1377                 return 0;
1378         }
1379
1380         /* if all the work is already done, get out of here */
1381         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1382             atomic_read(&jl->j_commit_left) <= 0) {
1383                 goto flush_older_and_return;
1384         }
1385
1386         /*
1387          * start by putting the commit list on disk.  This will also flush
1388          * the commit lists of any olders transactions
1389          */
1390         flush_commit_list(s, jl, 1);
1391
1392         if (!(jl->j_state & LIST_DIRTY)
1393             && !reiserfs_is_journal_aborted(journal))
1394                 BUG();
1395
1396         /* are we done now? */
1397         if (atomic_read(&jl->j_nonzerolen) <= 0 &&
1398             atomic_read(&jl->j_commit_left) <= 0) {
1399                 goto flush_older_and_return;
1400         }
1401
1402         /*
1403          * loop through each cnode, see if we need to write it,
1404          * or wait on a more recent transaction, or just ignore it
1405          */
1406         if (atomic_read(&journal->j_wcount) != 0) {
1407                 reiserfs_panic(s, "journal-844", "journal list is flushing, "
1408                                "wcount is not 0");
1409         }
1410         cn = jl->j_realblock;
1411         while (cn) {
1412                 was_jwait = 0;
1413                 was_dirty = 0;
1414                 saved_bh = NULL;
1415                 /* blocknr of 0 is no longer in the hash, ignore it */
1416                 if (cn->blocknr == 0) {
1417                         goto free_cnode;
1418                 }
1419
1420                 /*
1421                  * This transaction failed commit.
1422                  * Don't write out to the disk
1423                  */
1424                 if (!(jl->j_state & LIST_DIRTY))
1425                         goto free_cnode;
1426
1427                 pjl = find_newer_jl_for_cn(cn);
1428                 /*
1429                  * the order is important here.  We check pjl to make sure we
1430                  * don't clear BH_JDirty_wait if we aren't the one writing this
1431                  * block to disk
1432                  */
1433                 if (!pjl && cn->bh) {
1434                         saved_bh = cn->bh;
1435
1436                         /*
1437                          * we do this to make sure nobody releases the
1438                          * buffer while we are working with it
1439                          */
1440                         get_bh(saved_bh);
1441
1442                         if (buffer_journal_dirty(saved_bh)) {
1443                                 BUG_ON(!can_dirty(cn));
1444                                 was_jwait = 1;
1445                                 was_dirty = 1;
1446                         } else if (can_dirty(cn)) {
1447                                 /*
1448                                  * everything with !pjl && jwait
1449                                  * should be writable
1450                                  */
1451                                 BUG();
1452                         }
1453                 }
1454
1455                 /*
1456                  * if someone has this block in a newer transaction, just make
1457                  * sure they are committed, and don't try writing it to disk
1458                  */
1459                 if (pjl) {
1460                         if (atomic_read(&pjl->j_commit_left))
1461                                 flush_commit_list(s, pjl, 1);
1462                         goto free_cnode;
1463                 }
1464
1465                 /*
1466                  * bh == NULL when the block got to disk on its own, OR,
1467                  * the block got freed in a future transaction
1468                  */
1469                 if (saved_bh == NULL) {
1470                         goto free_cnode;
1471                 }
1472
1473                 /*
1474                  * this should never happen.  kupdate_one_transaction has
1475                  * this list locked while it works, so we should never see a
1476                  * buffer here that is not marked JDirty_wait
1477                  */
1478                 if ((!was_jwait) && !buffer_locked(saved_bh)) {
1479                         reiserfs_warning(s, "journal-813",
1480                                          "BAD! buffer %llu %cdirty %cjwait, "
1481                                          "not in a newer transaction",
1482                                          (unsigned long long)saved_bh->
1483                                          b_blocknr, was_dirty ? ' ' : '!',
1484                                          was_jwait ? ' ' : '!');
1485                 }
1486                 if (was_dirty) {
1487                         /*
1488                          * we inc again because saved_bh gets decremented
1489                          * at free_cnode
1490                          */
1491                         get_bh(saved_bh);
1492                         set_bit(BLOCK_NEEDS_FLUSH, &cn->state);
1493                         lock_buffer(saved_bh);
1494                         BUG_ON(cn->blocknr != saved_bh->b_blocknr);
1495                         if (buffer_dirty(saved_bh))
1496                                 submit_logged_buffer(saved_bh);
1497                         else
1498                                 unlock_buffer(saved_bh);
1499                         count++;
1500                 } else {
1501                         reiserfs_warning(s, "clm-2082",
1502                                          "Unable to flush buffer %llu in %s",
1503                                          (unsigned long long)saved_bh->
1504                                          b_blocknr, __func__);
1505                 }
1506 free_cnode:
1507                 cn = cn->next;
1508                 if (saved_bh) {
1509                         /*
1510                          * we incremented this to keep others from
1511                          * taking the buffer head away
1512                          */
1513                         put_bh(saved_bh);
1514                         if (atomic_read(&saved_bh->b_count) < 0) {
1515                                 reiserfs_warning(s, "journal-945",
1516                                                  "saved_bh->b_count < 0");
1517                         }
1518                 }
1519         }
1520         if (count > 0) {
1521                 cn = jl->j_realblock;
1522                 while (cn) {
1523                         if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) {
1524                                 if (!cn->bh) {
1525                                         reiserfs_panic(s, "journal-1011",
1526                                                        "cn->bh is NULL");
1527                                 }
1528
1529                                 depth = reiserfs_write_unlock_nested(s);
1530                                 __wait_on_buffer(cn->bh);
1531                                 reiserfs_write_lock_nested(s, depth);
1532
1533                                 if (!cn->bh) {
1534                                         reiserfs_panic(s, "journal-1012",
1535                                                        "cn->bh is NULL");
1536                                 }
1537                                 if (unlikely(!buffer_uptodate(cn->bh))) {
1538 #ifdef CONFIG_REISERFS_CHECK
1539                                         reiserfs_warning(s, "journal-949",
1540                                                          "buffer write failed");
1541 #endif
1542                                         err = -EIO;
1543                                 }
1544                                 /*
1545                                  * note, we must clear the JDirty_wait bit
1546                                  * after the up to date check, otherwise we
1547                                  * race against our flushpage routine
1548                                  */
1549                                 BUG_ON(!test_clear_buffer_journal_dirty
1550                                        (cn->bh));
1551
1552                                 /* drop one ref for us */
1553                                 put_bh(cn->bh);
1554                                 /* drop one ref for journal_mark_dirty */
1555                                 release_buffer_page(cn->bh);
1556                         }
1557                         cn = cn->next;
1558                 }
1559         }
1560
1561         if (err)
1562                 reiserfs_abort(s, -EIO,
1563                                "Write error while pushing transaction to disk in %s",
1564                                __func__);
1565 flush_older_and_return:
1566
1567         /*
1568          * before we can update the journal header block, we _must_ flush all
1569          * real blocks from all older transactions to disk.  This is because
1570          * once the header block is updated, this transaction will not be
1571          * replayed after a crash
1572          */
1573         if (flushall) {
1574                 flush_older_journal_lists(s, jl);
1575         }
1576
1577         err = journal->j_errno;
1578         /*
1579          * before we can remove everything from the hash tables for this
1580          * transaction, we must make sure it can never be replayed
1581          *
1582          * since we are only called from do_journal_end, we know for sure there
1583          * are no allocations going on while we are flushing journal lists.  So,
1584          * we only need to update the journal header block for the last list
1585          * being flushed
1586          */
1587         if (!err && flushall) {
1588                 err =
1589                     update_journal_header_block(s,
1590                                                 (jl->j_start + jl->j_len +
1591                                                  2) % SB_ONDISK_JOURNAL_SIZE(s),
1592                                                 jl->j_trans_id);
1593                 if (err)
1594                         reiserfs_abort(s, -EIO,
1595                                        "Write error while updating journal header in %s",
1596                                        __func__);
1597         }
1598         remove_all_from_journal_list(s, jl, 0);
1599         list_del_init(&jl->j_list);
1600         journal->j_num_lists--;
1601         del_from_work_list(s, jl);
1602
1603         if (journal->j_last_flush_id != 0 &&
1604             (jl->j_trans_id - journal->j_last_flush_id) != 1) {
1605                 reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu",
1606                                  journal->j_last_flush_id, jl->j_trans_id);
1607         }
1608         journal->j_last_flush_id = jl->j_trans_id;
1609
1610         /*
1611          * not strictly required since we are freeing the list, but it should
1612          * help find code using dead lists later on
1613          */
1614         jl->j_len = 0;
1615         atomic_set(&jl->j_nonzerolen, 0);
1616         jl->j_start = 0;
1617         jl->j_realblock = NULL;
1618         jl->j_commit_bh = NULL;
1619         jl->j_trans_id = 0;
1620         jl->j_state = 0;
1621         put_journal_list(s, jl);
1622         if (flushall)
1623                 mutex_unlock(&journal->j_flush_mutex);
1624         return err;
1625 }
1626
1627 static int write_one_transaction(struct super_block *s,
1628                                  struct reiserfs_journal_list *jl,
1629                                  struct buffer_chunk *chunk)
1630 {
1631         struct reiserfs_journal_cnode *cn;
1632         int ret = 0;
1633
1634         jl->j_state |= LIST_TOUCHED;
1635         del_from_work_list(s, jl);
1636         if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) {
1637                 return 0;
1638         }
1639
1640         cn = jl->j_realblock;
1641         while (cn) {
1642                 /*
1643                  * if the blocknr == 0, this has been cleared from the hash,
1644                  * skip it
1645                  */
1646                 if (cn->blocknr == 0) {
1647                         goto next;
1648                 }
1649                 if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) {
1650                         struct buffer_head *tmp_bh;
1651                         /*
1652                          * we can race against journal_mark_freed when we try
1653                          * to lock_buffer(cn->bh), so we have to inc the buffer
1654                          * count, and recheck things after locking
1655                          */
1656                         tmp_bh = cn->bh;
1657                         get_bh(tmp_bh);
1658                         lock_buffer(tmp_bh);
1659                         if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) {
1660                                 if (!buffer_journal_dirty(tmp_bh) ||
1661                                     buffer_journal_prepared(tmp_bh))
1662                                         BUG();
1663                                 add_to_chunk(chunk, tmp_bh, NULL, write_chunk);
1664                                 ret++;
1665                         } else {
1666                                 /* note, cn->bh might be null now */
1667                                 unlock_buffer(tmp_bh);
1668                         }
1669                         put_bh(tmp_bh);
1670                 }
1671 next:
1672                 cn = cn->next;
1673                 cond_resched();
1674         }
1675         return ret;
1676 }
1677
1678 /* used by flush_commit_list */
1679 static void dirty_one_transaction(struct super_block *s,
1680                                  struct reiserfs_journal_list *jl)
1681 {
1682         struct reiserfs_journal_cnode *cn;
1683         struct reiserfs_journal_list *pjl;
1684
1685         jl->j_state |= LIST_DIRTY;
1686         cn = jl->j_realblock;
1687         while (cn) {
1688                 /*
1689                  * look for a more recent transaction that logged this
1690                  * buffer.  Only the most recent transaction with a buffer in
1691                  * it is allowed to send that buffer to disk
1692                  */
1693                 pjl = find_newer_jl_for_cn(cn);
1694                 if (!pjl && cn->blocknr && cn->bh
1695                     && buffer_journal_dirty(cn->bh)) {
1696                         BUG_ON(!can_dirty(cn));
1697                         /*
1698                          * if the buffer is prepared, it will either be logged
1699                          * or restored.  If restored, we need to make sure
1700                          * it actually gets marked dirty
1701                          */
1702                         clear_buffer_journal_new(cn->bh);
1703                         if (buffer_journal_prepared(cn->bh)) {
1704                                 set_buffer_journal_restore_dirty(cn->bh);
1705                         } else {
1706                                 set_buffer_journal_test(cn->bh);
1707                                 mark_buffer_dirty(cn->bh);
1708                         }
1709                 }
1710                 cn = cn->next;
1711         }
1712 }
1713
1714 static int kupdate_transactions(struct super_block *s,
1715                                 struct reiserfs_journal_list *jl,
1716                                 struct reiserfs_journal_list **next_jl,
1717                                 unsigned int *next_trans_id,
1718                                 int num_blocks, int num_trans)
1719 {
1720         int ret = 0;
1721         int written = 0;
1722         int transactions_flushed = 0;
1723         unsigned int orig_trans_id = jl->j_trans_id;
1724         struct buffer_chunk chunk;
1725         struct list_head *entry;
1726         struct reiserfs_journal *journal = SB_JOURNAL(s);
1727         chunk.nr = 0;
1728
1729         reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s);
1730         if (!journal_list_still_alive(s, orig_trans_id)) {
1731                 goto done;
1732         }
1733
1734         /*
1735          * we've got j_flush_mutex held, nobody is going to delete any
1736          * of these lists out from underneath us
1737          */
1738         while ((num_trans && transactions_flushed < num_trans) ||
1739                (!num_trans && written < num_blocks)) {
1740
1741                 if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) ||
1742                     atomic_read(&jl->j_commit_left)
1743                     || !(jl->j_state & LIST_DIRTY)) {
1744                         del_from_work_list(s, jl);
1745                         break;
1746                 }
1747                 ret = write_one_transaction(s, jl, &chunk);
1748
1749                 if (ret < 0)
1750                         goto done;
1751                 transactions_flushed++;
1752                 written += ret;
1753                 entry = jl->j_list.next;
1754
1755                 /* did we wrap? */
1756                 if (entry == &journal->j_journal_list) {
1757                         break;
1758                 }
1759                 jl = JOURNAL_LIST_ENTRY(entry);
1760
1761                 /* don't bother with older transactions */
1762                 if (jl->j_trans_id <= orig_trans_id)
1763                         break;
1764         }
1765         if (chunk.nr) {
1766                 write_chunk(&chunk);
1767         }
1768
1769 done:
1770         mutex_unlock(&journal->j_flush_mutex);
1771         return ret;
1772 }
1773
1774 /*
1775  * for o_sync and fsync heavy applications, they tend to use
1776  * all the journa list slots with tiny transactions.  These
1777  * trigger lots and lots of calls to update the header block, which
1778  * adds seeks and slows things down.
1779  *
1780  * This function tries to clear out a large chunk of the journal lists
1781  * at once, which makes everything faster since only the newest journal
1782  * list updates the header block
1783  */
1784 static int flush_used_journal_lists(struct super_block *s,
1785                                     struct reiserfs_journal_list *jl)
1786 {
1787         unsigned long len = 0;
1788         unsigned long cur_len;
1789         int i;
1790         int limit = 256;
1791         struct reiserfs_journal_list *tjl;
1792         struct reiserfs_journal_list *flush_jl;
1793         unsigned int trans_id;
1794         struct reiserfs_journal *journal = SB_JOURNAL(s);
1795
1796         flush_jl = tjl = jl;
1797
1798         /* in data logging mode, try harder to flush a lot of blocks */
1799         if (reiserfs_data_log(s))
1800                 limit = 1024;
1801         /* flush for 256 transactions or limit blocks, whichever comes first */
1802         for (i = 0; i < 256 && len < limit; i++) {
1803                 if (atomic_read(&tjl->j_commit_left) ||
1804                     tjl->j_trans_id < jl->j_trans_id) {
1805                         break;
1806                 }
1807                 cur_len = atomic_read(&tjl->j_nonzerolen);
1808                 if (cur_len > 0) {
1809                         tjl->j_state &= ~LIST_TOUCHED;
1810                 }
1811                 len += cur_len;
1812                 flush_jl = tjl;
1813                 if (tjl->j_list.next == &journal->j_journal_list)
1814                         break;
1815                 tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next);
1816         }
1817         get_journal_list(jl);
1818         get_journal_list(flush_jl);
1819
1820         /*
1821          * try to find a group of blocks we can flush across all the
1822          * transactions, but only bother if we've actually spanned
1823          * across multiple lists
1824          */
1825         if (flush_jl != jl)
1826                 kupdate_transactions(s, jl, &tjl, &trans_id, len, i);
1827
1828         flush_journal_list(s, flush_jl, 1);
1829         put_journal_list(s, flush_jl);
1830         put_journal_list(s, jl);
1831         return 0;
1832 }
1833
1834 /*
1835  * removes any nodes in table with name block and dev as bh.
1836  * only touchs the hnext and hprev pointers.
1837  */
1838 static void remove_journal_hash(struct super_block *sb,
1839                          struct reiserfs_journal_cnode **table,
1840                          struct reiserfs_journal_list *jl,
1841                          unsigned long block, int remove_freed)
1842 {
1843         struct reiserfs_journal_cnode *cur;
1844         struct reiserfs_journal_cnode **head;
1845
1846         head = &(journal_hash(table, sb, block));
1847         if (!head) {
1848                 return;
1849         }
1850         cur = *head;
1851         while (cur) {
1852                 if (cur->blocknr == block && cur->sb == sb
1853                     && (jl == NULL || jl == cur->jlist)
1854                     && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) {
1855                         if (cur->hnext) {
1856                                 cur->hnext->hprev = cur->hprev;
1857                         }
1858                         if (cur->hprev) {
1859                                 cur->hprev->hnext = cur->hnext;
1860                         } else {
1861                                 *head = cur->hnext;
1862                         }
1863                         cur->blocknr = 0;
1864                         cur->sb = NULL;
1865                         cur->state = 0;
1866                         /*
1867                          * anybody who clears the cur->bh will also
1868                          * dec the nonzerolen
1869                          */
1870                         if (cur->bh && cur->jlist)
1871                                 atomic_dec(&cur->jlist->j_nonzerolen);
1872                         cur->bh = NULL;
1873                         cur->jlist = NULL;
1874                 }
1875                 cur = cur->hnext;
1876         }
1877 }
1878
1879 static void free_journal_ram(struct super_block *sb)
1880 {
1881         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1882         kfree(journal->j_current_jl);
1883         journal->j_num_lists--;
1884
1885         vfree(journal->j_cnode_free_orig);
1886         free_list_bitmaps(sb, journal->j_list_bitmap);
1887         free_bitmap_nodes(sb);  /* must be after free_list_bitmaps */
1888         if (journal->j_header_bh) {
1889                 brelse(journal->j_header_bh);
1890         }
1891         /*
1892          * j_header_bh is on the journal dev, make sure
1893          * not to release the journal dev until we brelse j_header_bh
1894          */
1895         release_journal_dev(sb, journal);
1896         vfree(journal);
1897 }
1898
1899 /*
1900  * call on unmount.  Only set error to 1 if you haven't made your way out
1901  * of read_super() yet.  Any other caller must keep error at 0.
1902  */
1903 static int do_journal_release(struct reiserfs_transaction_handle *th,
1904                               struct super_block *sb, int error)
1905 {
1906         struct reiserfs_transaction_handle myth;
1907         struct reiserfs_journal *journal = SB_JOURNAL(sb);
1908
1909         /*
1910          * we only want to flush out transactions if we were
1911          * called with error == 0
1912          */
1913         if (!error && !sb_rdonly(sb)) {
1914                 /* end the current trans */
1915                 BUG_ON(!th->t_trans_id);
1916                 do_journal_end(th, FLUSH_ALL);
1917
1918                 /*
1919                  * make sure something gets logged to force
1920                  * our way into the flush code
1921                  */
1922                 if (!journal_join(&myth, sb)) {
1923                         reiserfs_prepare_for_journal(sb,
1924                                                      SB_BUFFER_WITH_SB(sb),
1925                                                      1);
1926                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1927                         do_journal_end(&myth, FLUSH_ALL);
1928                 }
1929         }
1930
1931         /* this also catches errors during the do_journal_end above */
1932         if (!error && reiserfs_is_journal_aborted(journal)) {
1933                 memset(&myth, 0, sizeof(myth));
1934                 if (!journal_join_abort(&myth, sb)) {
1935                         reiserfs_prepare_for_journal(sb,
1936                                                      SB_BUFFER_WITH_SB(sb),
1937                                                      1);
1938                         journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb));
1939                         do_journal_end(&myth, FLUSH_ALL);
1940                 }
1941         }
1942
1943
1944         /*
1945          * We must release the write lock here because
1946          * the workqueue job (flush_async_commit) needs this lock
1947          */
1948         reiserfs_write_unlock(sb);
1949
1950         /*
1951          * Cancel flushing of old commits. Note that neither of these works
1952          * will be requeued because superblock is being shutdown and doesn't
1953          * have SB_ACTIVE set.
1954          */
1955         reiserfs_cancel_old_flush(sb);
1956         /* wait for all commits to finish */
1957         cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work);
1958
1959         free_journal_ram(sb);
1960
1961         reiserfs_write_lock(sb);
1962
1963         return 0;
1964 }
1965
1966 /* * call on unmount.  flush all journal trans, release all alloc'd ram */
1967 int journal_release(struct reiserfs_transaction_handle *th,
1968                     struct super_block *sb)
1969 {
1970         return do_journal_release(th, sb, 0);
1971 }
1972
1973 /* only call from an error condition inside reiserfs_read_super!  */
1974 int journal_release_error(struct reiserfs_transaction_handle *th,
1975                           struct super_block *sb)
1976 {
1977         return do_journal_release(th, sb, 1);
1978 }
1979
1980 /*
1981  * compares description block with commit block.
1982  * returns 1 if they differ, 0 if they are the same
1983  */
1984 static int journal_compare_desc_commit(struct super_block *sb,
1985                                        struct reiserfs_journal_desc *desc,
1986                                        struct reiserfs_journal_commit *commit)
1987 {
1988         if (get_commit_trans_id(commit) != get_desc_trans_id(desc) ||
1989             get_commit_trans_len(commit) != get_desc_trans_len(desc) ||
1990             get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max ||
1991             get_commit_trans_len(commit) <= 0) {
1992                 return 1;
1993         }
1994         return 0;
1995 }
1996
1997 /*
1998  * returns 0 if it did not find a description block
1999  * returns -1 if it found a corrupt commit block
2000  * returns 1 if both desc and commit were valid
2001  * NOTE: only called during fs mount
2002  */
2003 static int journal_transaction_is_valid(struct super_block *sb,
2004                                         struct buffer_head *d_bh,
2005                                         unsigned int *oldest_invalid_trans_id,
2006                                         unsigned long *newest_mount_id)
2007 {
2008         struct reiserfs_journal_desc *desc;
2009         struct reiserfs_journal_commit *commit;
2010         struct buffer_head *c_bh;
2011         unsigned long offset;
2012
2013         if (!d_bh)
2014                 return 0;
2015
2016         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2017         if (get_desc_trans_len(desc) > 0
2018             && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) {
2019                 if (oldest_invalid_trans_id && *oldest_invalid_trans_id
2020                     && get_desc_trans_id(desc) > *oldest_invalid_trans_id) {
2021                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2022                                        "journal-986: transaction "
2023                                        "is valid returning because trans_id %d is greater than "
2024                                        "oldest_invalid %lu",
2025                                        get_desc_trans_id(desc),
2026                                        *oldest_invalid_trans_id);
2027                         return 0;
2028                 }
2029                 if (newest_mount_id
2030                     && *newest_mount_id > get_desc_mount_id(desc)) {
2031                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2032                                        "journal-1087: transaction "
2033                                        "is valid returning because mount_id %d is less than "
2034                                        "newest_mount_id %lu",
2035                                        get_desc_mount_id(desc),
2036                                        *newest_mount_id);
2037                         return -1;
2038                 }
2039                 if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) {
2040                         reiserfs_warning(sb, "journal-2018",
2041                                          "Bad transaction length %d "
2042                                          "encountered, ignoring transaction",
2043                                          get_desc_trans_len(desc));
2044                         return -1;
2045                 }
2046                 offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2047
2048                 /*
2049                  * ok, we have a journal description block,
2050                  * let's see if the transaction was valid
2051                  */
2052                 c_bh =
2053                     journal_bread(sb,
2054                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2055                                   ((offset + get_desc_trans_len(desc) +
2056                                     1) % SB_ONDISK_JOURNAL_SIZE(sb)));
2057                 if (!c_bh)
2058                         return 0;
2059                 commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2060                 if (journal_compare_desc_commit(sb, desc, commit)) {
2061                         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2062                                        "journal_transaction_is_valid, commit offset %ld had bad "
2063                                        "time %d or length %d",
2064                                        c_bh->b_blocknr -
2065                                        SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2066                                        get_commit_trans_id(commit),
2067                                        get_commit_trans_len(commit));
2068                         brelse(c_bh);
2069                         if (oldest_invalid_trans_id) {
2070                                 *oldest_invalid_trans_id =
2071                                     get_desc_trans_id(desc);
2072                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2073                                                "journal-1004: "
2074                                                "transaction_is_valid setting oldest invalid trans_id "
2075                                                "to %d",
2076                                                get_desc_trans_id(desc));
2077                         }
2078                         return -1;
2079                 }
2080                 brelse(c_bh);
2081                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2082                                "journal-1006: found valid "
2083                                "transaction start offset %llu, len %d id %d",
2084                                d_bh->b_blocknr -
2085                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2086                                get_desc_trans_len(desc),
2087                                get_desc_trans_id(desc));
2088                 return 1;
2089         } else {
2090                 return 0;
2091         }
2092 }
2093
2094 static void brelse_array(struct buffer_head **heads, int num)
2095 {
2096         int i;
2097         for (i = 0; i < num; i++) {
2098                 brelse(heads[i]);
2099         }
2100 }
2101
2102 /*
2103  * given the start, and values for the oldest acceptable transactions,
2104  * this either reads in a replays a transaction, or returns because the
2105  * transaction is invalid, or too old.
2106  * NOTE: only called during fs mount
2107  */
2108 static int journal_read_transaction(struct super_block *sb,
2109                                     unsigned long cur_dblock,
2110                                     unsigned long oldest_start,
2111                                     unsigned int oldest_trans_id,
2112                                     unsigned long newest_mount_id)
2113 {
2114         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2115         struct reiserfs_journal_desc *desc;
2116         struct reiserfs_journal_commit *commit;
2117         unsigned int trans_id = 0;
2118         struct buffer_head *c_bh;
2119         struct buffer_head *d_bh;
2120         struct buffer_head **log_blocks = NULL;
2121         struct buffer_head **real_blocks = NULL;
2122         unsigned int trans_offset;
2123         int i;
2124         int trans_half;
2125
2126         d_bh = journal_bread(sb, cur_dblock);
2127         if (!d_bh)
2128                 return 1;
2129         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2130         trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2131         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: "
2132                        "journal_read_transaction, offset %llu, len %d mount_id %d",
2133                        d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2134                        get_desc_trans_len(desc), get_desc_mount_id(desc));
2135         if (get_desc_trans_id(desc) < oldest_trans_id) {
2136                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: "
2137                                "journal_read_trans skipping because %lu is too old",
2138                                cur_dblock -
2139                                SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2140                 brelse(d_bh);
2141                 return 1;
2142         }
2143         if (get_desc_mount_id(desc) != newest_mount_id) {
2144                 reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: "
2145                                "journal_read_trans skipping because %d is != "
2146                                "newest_mount_id %lu", get_desc_mount_id(desc),
2147                                newest_mount_id);
2148                 brelse(d_bh);
2149                 return 1;
2150         }
2151         c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2152                              ((trans_offset + get_desc_trans_len(desc) + 1) %
2153                               SB_ONDISK_JOURNAL_SIZE(sb)));
2154         if (!c_bh) {
2155                 brelse(d_bh);
2156                 return 1;
2157         }
2158         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
2159         if (journal_compare_desc_commit(sb, desc, commit)) {
2160                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2161                                "journal_read_transaction, "
2162                                "commit offset %llu had bad time %d or length %d",
2163                                c_bh->b_blocknr -
2164                                SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2165                                get_commit_trans_id(commit),
2166                                get_commit_trans_len(commit));
2167                 brelse(c_bh);
2168                 brelse(d_bh);
2169                 return 1;
2170         }
2171
2172         if (bdev_read_only(sb->s_bdev)) {
2173                 reiserfs_warning(sb, "clm-2076",
2174                                  "device is readonly, unable to replay log");
2175                 brelse(c_bh);
2176                 brelse(d_bh);
2177                 return -EROFS;
2178         }
2179
2180         trans_id = get_desc_trans_id(desc);
2181         /*
2182          * now we know we've got a good transaction, and it was
2183          * inside the valid time ranges
2184          */
2185         log_blocks = kmalloc_array(get_desc_trans_len(desc),
2186                                    sizeof(struct buffer_head *),
2187                                    GFP_NOFS);
2188         real_blocks = kmalloc_array(get_desc_trans_len(desc),
2189                                     sizeof(struct buffer_head *),
2190                                     GFP_NOFS);
2191         if (!log_blocks || !real_blocks) {
2192                 brelse(c_bh);
2193                 brelse(d_bh);
2194                 kfree(log_blocks);
2195                 kfree(real_blocks);
2196                 reiserfs_warning(sb, "journal-1169",
2197                                  "kmalloc failed, unable to mount FS");
2198                 return -1;
2199         }
2200         /* get all the buffer heads */
2201         trans_half = journal_trans_half(sb->s_blocksize);
2202         for (i = 0; i < get_desc_trans_len(desc); i++) {
2203                 log_blocks[i] =
2204                     journal_getblk(sb,
2205                                    SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2206                                    (trans_offset + 1 +
2207                                     i) % SB_ONDISK_JOURNAL_SIZE(sb));
2208                 if (i < trans_half) {
2209                         real_blocks[i] =
2210                             sb_getblk(sb,
2211                                       le32_to_cpu(desc->j_realblock[i]));
2212                 } else {
2213                         real_blocks[i] =
2214                             sb_getblk(sb,
2215                                       le32_to_cpu(commit->
2216                                                   j_realblock[i - trans_half]));
2217                 }
2218                 if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) {
2219                         reiserfs_warning(sb, "journal-1207",
2220                                          "REPLAY FAILURE fsck required! "
2221                                          "Block to replay is outside of "
2222                                          "filesystem");
2223                         goto abort_replay;
2224                 }
2225                 /* make sure we don't try to replay onto log or reserved area */
2226                 if (is_block_in_log_or_reserved_area
2227                     (sb, real_blocks[i]->b_blocknr)) {
2228                         reiserfs_warning(sb, "journal-1204",
2229                                          "REPLAY FAILURE fsck required! "
2230                                          "Trying to replay onto a log block");
2231 abort_replay:
2232                         brelse_array(log_blocks, i);
2233                         brelse_array(real_blocks, i);
2234                         brelse(c_bh);
2235                         brelse(d_bh);
2236                         kfree(log_blocks);
2237                         kfree(real_blocks);
2238                         return -1;
2239                 }
2240         }
2241         /* read in the log blocks, memcpy to the corresponding real block */
2242         ll_rw_block(REQ_OP_READ, 0, get_desc_trans_len(desc), log_blocks);
2243         for (i = 0; i < get_desc_trans_len(desc); i++) {
2244
2245                 wait_on_buffer(log_blocks[i]);
2246                 if (!buffer_uptodate(log_blocks[i])) {
2247                         reiserfs_warning(sb, "journal-1212",
2248                                          "REPLAY FAILURE fsck required! "
2249                                          "buffer write failed");
2250                         brelse_array(log_blocks + i,
2251                                      get_desc_trans_len(desc) - i);
2252                         brelse_array(real_blocks, get_desc_trans_len(desc));
2253                         brelse(c_bh);
2254                         brelse(d_bh);
2255                         kfree(log_blocks);
2256                         kfree(real_blocks);
2257                         return -1;
2258                 }
2259                 memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data,
2260                        real_blocks[i]->b_size);
2261                 set_buffer_uptodate(real_blocks[i]);
2262                 brelse(log_blocks[i]);
2263         }
2264         /* flush out the real blocks */
2265         for (i = 0; i < get_desc_trans_len(desc); i++) {
2266                 set_buffer_dirty(real_blocks[i]);
2267                 write_dirty_buffer(real_blocks[i], 0);
2268         }
2269         for (i = 0; i < get_desc_trans_len(desc); i++) {
2270                 wait_on_buffer(real_blocks[i]);
2271                 if (!buffer_uptodate(real_blocks[i])) {
2272                         reiserfs_warning(sb, "journal-1226",
2273                                          "REPLAY FAILURE, fsck required! "
2274                                          "buffer write failed");
2275                         brelse_array(real_blocks + i,
2276                                      get_desc_trans_len(desc) - i);
2277                         brelse(c_bh);
2278                         brelse(d_bh);
2279                         kfree(log_blocks);
2280                         kfree(real_blocks);
2281                         return -1;
2282                 }
2283                 brelse(real_blocks[i]);
2284         }
2285         cur_dblock =
2286             SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2287             ((trans_offset + get_desc_trans_len(desc) +
2288               2) % SB_ONDISK_JOURNAL_SIZE(sb));
2289         reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2290                        "journal-1095: setting journal " "start to offset %ld",
2291                        cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2292
2293         /*
2294          * init starting values for the first transaction, in case
2295          * this is the last transaction to be replayed.
2296          */
2297         journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2298         journal->j_last_flush_trans_id = trans_id;
2299         journal->j_trans_id = trans_id + 1;
2300         /* check for trans_id overflow */
2301         if (journal->j_trans_id == 0)
2302                 journal->j_trans_id = 10;
2303         brelse(c_bh);
2304         brelse(d_bh);
2305         kfree(log_blocks);
2306         kfree(real_blocks);
2307         return 0;
2308 }
2309
2310 /*
2311  * This function reads blocks starting from block and to max_block of bufsize
2312  * size (but no more than BUFNR blocks at a time). This proved to improve
2313  * mounting speed on self-rebuilding raid5 arrays at least.
2314  * Right now it is only used from journal code. But later we might use it
2315  * from other places.
2316  * Note: Do not use journal_getblk/sb_getblk functions here!
2317  */
2318 static struct buffer_head *reiserfs_breada(struct block_device *dev,
2319                                            b_blocknr_t block, int bufsize,
2320                                            b_blocknr_t max_block)
2321 {
2322         struct buffer_head *bhlist[BUFNR];
2323         unsigned int blocks = BUFNR;
2324         struct buffer_head *bh;
2325         int i, j;
2326
2327         bh = __getblk(dev, block, bufsize);
2328         if (!bh || buffer_uptodate(bh))
2329                 return (bh);
2330
2331         if (block + BUFNR > max_block) {
2332                 blocks = max_block - block;
2333         }
2334         bhlist[0] = bh;
2335         j = 1;
2336         for (i = 1; i < blocks; i++) {
2337                 bh = __getblk(dev, block + i, bufsize);
2338                 if (!bh)
2339                         break;
2340                 if (buffer_uptodate(bh)) {
2341                         brelse(bh);
2342                         break;
2343                 } else
2344                         bhlist[j++] = bh;
2345         }
2346         ll_rw_block(REQ_OP_READ, 0, j, bhlist);
2347         for (i = 1; i < j; i++)
2348                 brelse(bhlist[i]);
2349         bh = bhlist[0];
2350         wait_on_buffer(bh);
2351         if (buffer_uptodate(bh))
2352                 return bh;
2353         brelse(bh);
2354         return NULL;
2355 }
2356
2357 /*
2358  * read and replay the log
2359  * on a clean unmount, the journal header's next unflushed pointer will be
2360  * to an invalid transaction.  This tests that before finding all the
2361  * transactions in the log, which makes normal mount times fast.
2362  *
2363  * After a crash, this starts with the next unflushed transaction, and
2364  * replays until it finds one too old, or invalid.
2365  *
2366  * On exit, it sets things up so the first transaction will work correctly.
2367  * NOTE: only called during fs mount
2368  */
2369 static int journal_read(struct super_block *sb)
2370 {
2371         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2372         struct reiserfs_journal_desc *desc;
2373         unsigned int oldest_trans_id = 0;
2374         unsigned int oldest_invalid_trans_id = 0;
2375         time64_t start;
2376         unsigned long oldest_start = 0;
2377         unsigned long cur_dblock = 0;
2378         unsigned long newest_mount_id = 9;
2379         struct buffer_head *d_bh;
2380         struct reiserfs_journal_header *jh;
2381         int valid_journal_header = 0;
2382         int replay_count = 0;
2383         int continue_replay = 1;
2384         int ret;
2385
2386         cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb);
2387         reiserfs_info(sb, "checking transaction log (%pg)\n",
2388                       journal->j_dev_bd);
2389         start = ktime_get_seconds();
2390
2391         /*
2392          * step 1, read in the journal header block.  Check the transaction
2393          * it says is the first unflushed, and if that transaction is not
2394          * valid, replay is done
2395          */
2396         journal->j_header_bh = journal_bread(sb,
2397                                              SB_ONDISK_JOURNAL_1st_BLOCK(sb)
2398                                              + SB_ONDISK_JOURNAL_SIZE(sb));
2399         if (!journal->j_header_bh) {
2400                 return 1;
2401         }
2402         jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data);
2403         if (le32_to_cpu(jh->j_first_unflushed_offset) <
2404             SB_ONDISK_JOURNAL_SIZE(sb)
2405             && le32_to_cpu(jh->j_last_flush_trans_id) > 0) {
2406                 oldest_start =
2407                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2408                     le32_to_cpu(jh->j_first_unflushed_offset);
2409                 oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2410                 newest_mount_id = le32_to_cpu(jh->j_mount_id);
2411                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2412                                "journal-1153: found in "
2413                                "header: first_unflushed_offset %d, last_flushed_trans_id "
2414                                "%lu", le32_to_cpu(jh->j_first_unflushed_offset),
2415                                le32_to_cpu(jh->j_last_flush_trans_id));
2416                 valid_journal_header = 1;
2417
2418                 /*
2419                  * now, we try to read the first unflushed offset.  If it
2420                  * is not valid, there is nothing more we can do, and it
2421                  * makes no sense to read through the whole log.
2422                  */
2423                 d_bh =
2424                     journal_bread(sb,
2425                                   SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2426                                   le32_to_cpu(jh->j_first_unflushed_offset));
2427                 ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL);
2428                 if (!ret) {
2429                         continue_replay = 0;
2430                 }
2431                 brelse(d_bh);
2432                 goto start_log_replay;
2433         }
2434
2435         /*
2436          * ok, there are transactions that need to be replayed.  start
2437          * with the first log block, find all the valid transactions, and
2438          * pick out the oldest.
2439          */
2440         while (continue_replay
2441                && cur_dblock <
2442                (SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2443                 SB_ONDISK_JOURNAL_SIZE(sb))) {
2444                 /*
2445                  * Note that it is required for blocksize of primary fs
2446                  * device and journal device to be the same
2447                  */
2448                 d_bh =
2449                     reiserfs_breada(journal->j_dev_bd, cur_dblock,
2450                                     sb->s_blocksize,
2451                                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2452                                     SB_ONDISK_JOURNAL_SIZE(sb));
2453                 ret =
2454                     journal_transaction_is_valid(sb, d_bh,
2455                                                  &oldest_invalid_trans_id,
2456                                                  &newest_mount_id);
2457                 if (ret == 1) {
2458                         desc = (struct reiserfs_journal_desc *)d_bh->b_data;
2459                         if (oldest_start == 0) {        /* init all oldest_ values */
2460                                 oldest_trans_id = get_desc_trans_id(desc);
2461                                 oldest_start = d_bh->b_blocknr;
2462                                 newest_mount_id = get_desc_mount_id(desc);
2463                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2464                                                "journal-1179: Setting "
2465                                                "oldest_start to offset %llu, trans_id %lu",
2466                                                oldest_start -
2467                                                SB_ONDISK_JOURNAL_1st_BLOCK
2468                                                (sb), oldest_trans_id);
2469                         } else if (oldest_trans_id > get_desc_trans_id(desc)) {
2470                                 /* one we just read was older */
2471                                 oldest_trans_id = get_desc_trans_id(desc);
2472                                 oldest_start = d_bh->b_blocknr;
2473                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2474                                                "journal-1180: Resetting "
2475                                                "oldest_start to offset %lu, trans_id %lu",
2476                                                oldest_start -
2477                                                SB_ONDISK_JOURNAL_1st_BLOCK
2478                                                (sb), oldest_trans_id);
2479                         }
2480                         if (newest_mount_id < get_desc_mount_id(desc)) {
2481                                 newest_mount_id = get_desc_mount_id(desc);
2482                                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2483                                                "journal-1299: Setting "
2484                                                "newest_mount_id to %d",
2485                                                get_desc_mount_id(desc));
2486                         }
2487                         cur_dblock += get_desc_trans_len(desc) + 2;
2488                 } else {
2489                         cur_dblock++;
2490                 }
2491                 brelse(d_bh);
2492         }
2493
2494 start_log_replay:
2495         cur_dblock = oldest_start;
2496         if (oldest_trans_id) {
2497                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2498                                "journal-1206: Starting replay "
2499                                "from offset %llu, trans_id %lu",
2500                                cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2501                                oldest_trans_id);
2502
2503         }
2504         replay_count = 0;
2505         while (continue_replay && oldest_trans_id > 0) {
2506                 ret =
2507                     journal_read_transaction(sb, cur_dblock, oldest_start,
2508                                              oldest_trans_id, newest_mount_id);
2509                 if (ret < 0) {
2510                         return ret;
2511                 } else if (ret != 0) {
2512                         break;
2513                 }
2514                 cur_dblock =
2515                     SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start;
2516                 replay_count++;
2517                 if (cur_dblock == oldest_start)
2518                         break;
2519         }
2520
2521         if (oldest_trans_id == 0) {
2522                 reiserfs_debug(sb, REISERFS_DEBUG_CODE,
2523                                "journal-1225: No valid " "transactions found");
2524         }
2525         /*
2526          * j_start does not get set correctly if we don't replay any
2527          * transactions.  if we had a valid journal_header, set j_start
2528          * to the first unflushed transaction value, copy the trans_id
2529          * from the header
2530          */
2531         if (valid_journal_header && replay_count == 0) {
2532                 journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset);
2533                 journal->j_trans_id =
2534                     le32_to_cpu(jh->j_last_flush_trans_id) + 1;
2535                 /* check for trans_id overflow */
2536                 if (journal->j_trans_id == 0)
2537                         journal->j_trans_id = 10;
2538                 journal->j_last_flush_trans_id =
2539                     le32_to_cpu(jh->j_last_flush_trans_id);
2540                 journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1;
2541         } else {
2542                 journal->j_mount_id = newest_mount_id + 1;
2543         }
2544         reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting "
2545                        "newest_mount_id to %lu", journal->j_mount_id);
2546         journal->j_first_unflushed_offset = journal->j_start;
2547         if (replay_count > 0) {
2548                 reiserfs_info(sb,
2549                               "replayed %d transactions in %lu seconds\n",
2550                               replay_count, ktime_get_seconds() - start);
2551         }
2552         /* needed to satisfy the locking in _update_journal_header_block */
2553         reiserfs_write_lock(sb);
2554         if (!bdev_read_only(sb->s_bdev) &&
2555             _update_journal_header_block(sb, journal->j_start,
2556                                          journal->j_last_flush_trans_id)) {
2557                 reiserfs_write_unlock(sb);
2558                 /*
2559                  * replay failed, caller must call free_journal_ram and abort
2560                  * the mount
2561                  */
2562                 return -1;
2563         }
2564         reiserfs_write_unlock(sb);
2565         return 0;
2566 }
2567
2568 static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s)
2569 {
2570         struct reiserfs_journal_list *jl;
2571         jl = kzalloc(sizeof(struct reiserfs_journal_list),
2572                      GFP_NOFS | __GFP_NOFAIL);
2573         INIT_LIST_HEAD(&jl->j_list);
2574         INIT_LIST_HEAD(&jl->j_working_list);
2575         INIT_LIST_HEAD(&jl->j_tail_bh_list);
2576         INIT_LIST_HEAD(&jl->j_bh_list);
2577         mutex_init(&jl->j_commit_mutex);
2578         SB_JOURNAL(s)->j_num_lists++;
2579         get_journal_list(jl);
2580         return jl;
2581 }
2582
2583 static void journal_list_init(struct super_block *sb)
2584 {
2585         SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb);
2586 }
2587
2588 static void release_journal_dev(struct super_block *super,
2589                                struct reiserfs_journal *journal)
2590 {
2591         if (journal->j_dev_bd != NULL) {
2592                 blkdev_put(journal->j_dev_bd, journal->j_dev_mode);
2593                 journal->j_dev_bd = NULL;
2594         }
2595 }
2596
2597 static int journal_init_dev(struct super_block *super,
2598                             struct reiserfs_journal *journal,
2599                             const char *jdev_name)
2600 {
2601         int result;
2602         dev_t jdev;
2603         fmode_t blkdev_mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
2604
2605         result = 0;
2606
2607         journal->j_dev_bd = NULL;
2608         jdev = SB_ONDISK_JOURNAL_DEVICE(super) ?
2609             new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev;
2610
2611         if (bdev_read_only(super->s_bdev))
2612                 blkdev_mode = FMODE_READ;
2613
2614         /* there is no "jdev" option and journal is on separate device */
2615         if ((!jdev_name || !jdev_name[0])) {
2616                 if (jdev == super->s_dev)
2617                         blkdev_mode &= ~FMODE_EXCL;
2618                 journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
2619                                                       journal);
2620                 journal->j_dev_mode = blkdev_mode;
2621                 if (IS_ERR(journal->j_dev_bd)) {
2622                         result = PTR_ERR(journal->j_dev_bd);
2623                         journal->j_dev_bd = NULL;
2624                         reiserfs_warning(super, "sh-458",
2625                                          "cannot init journal device unknown-block(%u,%u): %i",
2626                                          MAJOR(jdev), MINOR(jdev), result);
2627                         return result;
2628                 } else if (jdev != super->s_dev)
2629                         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2630
2631                 return 0;
2632         }
2633
2634         journal->j_dev_mode = blkdev_mode;
2635         journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
2636         if (IS_ERR(journal->j_dev_bd)) {
2637                 result = PTR_ERR(journal->j_dev_bd);
2638                 journal->j_dev_bd = NULL;
2639                 reiserfs_warning(super, "sh-457",
2640                                  "journal_init_dev: Cannot open '%s': %i",
2641                                  jdev_name, result);
2642                 return result;
2643         }
2644
2645         set_blocksize(journal->j_dev_bd, super->s_blocksize);
2646         reiserfs_info(super,
2647                       "journal_init_dev: journal device: %pg\n",
2648                       journal->j_dev_bd);
2649         return 0;
2650 }
2651
2652 /*
2653  * When creating/tuning a file system user can assign some
2654  * journal params within boundaries which depend on the ratio
2655  * blocksize/standard_blocksize.
2656  *
2657  * For blocks >= standard_blocksize transaction size should
2658  * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more
2659  * then JOURNAL_TRANS_MAX_DEFAULT.
2660  *
2661  * For blocks < standard_blocksize these boundaries should be
2662  * decreased proportionally.
2663  */
2664 #define REISERFS_STANDARD_BLKSIZE (4096)
2665
2666 static int check_advise_trans_params(struct super_block *sb,
2667                                      struct reiserfs_journal *journal)
2668 {
2669         if (journal->j_trans_max) {
2670                 /* Non-default journal params.  Do sanity check for them. */
2671                 int ratio = 1;
2672                 if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE)
2673                         ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize;
2674
2675                 if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio ||
2676                     journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio ||
2677                     SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max <
2678                     JOURNAL_MIN_RATIO) {
2679                         reiserfs_warning(sb, "sh-462",
2680                                          "bad transaction max size (%u). "
2681                                          "FSCK?", journal->j_trans_max);
2682                         return 1;
2683                 }
2684                 if (journal->j_max_batch != (journal->j_trans_max) *
2685                         JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) {
2686                         reiserfs_warning(sb, "sh-463",
2687                                          "bad transaction max batch (%u). "
2688                                          "FSCK?", journal->j_max_batch);
2689                         return 1;
2690                 }
2691         } else {
2692                 /*
2693                  * Default journal params.
2694                  * The file system was created by old version
2695                  * of mkreiserfs, so some fields contain zeros,
2696                  * and we need to advise proper values for them
2697                  */
2698                 if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) {
2699                         reiserfs_warning(sb, "sh-464", "bad blocksize (%u)",
2700                                          sb->s_blocksize);
2701                         return 1;
2702                 }
2703                 journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT;
2704                 journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT;
2705                 journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE;
2706         }
2707         return 0;
2708 }
2709
2710 /* must be called once on fs mount.  calls journal_read for you */
2711 int journal_init(struct super_block *sb, const char *j_dev_name,
2712                  int old_format, unsigned int commit_max_age)
2713 {
2714         int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2;
2715         struct buffer_head *bhjh;
2716         struct reiserfs_super_block *rs;
2717         struct reiserfs_journal_header *jh;
2718         struct reiserfs_journal *journal;
2719         struct reiserfs_journal_list *jl;
2720         int ret;
2721
2722         journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal));
2723         if (!journal) {
2724                 reiserfs_warning(sb, "journal-1256",
2725                                  "unable to get memory for journal structure");
2726                 return 1;
2727         }
2728         INIT_LIST_HEAD(&journal->j_bitmap_nodes);
2729         INIT_LIST_HEAD(&journal->j_prealloc_list);
2730         INIT_LIST_HEAD(&journal->j_working_list);
2731         INIT_LIST_HEAD(&journal->j_journal_list);
2732         journal->j_persistent_trans = 0;
2733         if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap,
2734                                            reiserfs_bmap_count(sb)))
2735                 goto free_and_return;
2736
2737         allocate_bitmap_nodes(sb);
2738
2739         /* reserved for journal area support */
2740         SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ?
2741                                                  REISERFS_OLD_DISK_OFFSET_IN_BYTES
2742                                                  / sb->s_blocksize +
2743                                                  reiserfs_bmap_count(sb) +
2744                                                  1 :
2745                                                  REISERFS_DISK_OFFSET_IN_BYTES /
2746                                                  sb->s_blocksize + 2);
2747
2748         /*
2749          * Sanity check to see is the standard journal fitting
2750          * within first bitmap (actual for small blocksizes)
2751          */
2752         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2753             (SB_JOURNAL_1st_RESERVED_BLOCK(sb) +
2754              SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) {
2755                 reiserfs_warning(sb, "journal-1393",
2756                                  "journal does not fit for area addressed "
2757                                  "by first of bitmap blocks. It starts at "
2758                                  "%u and its size is %u. Block size %ld",
2759                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2760                                  SB_ONDISK_JOURNAL_SIZE(sb),
2761                                  sb->s_blocksize);
2762                 goto free_and_return;
2763         }
2764
2765         /*
2766          * Sanity check to see if journal first block is correct.
2767          * If journal first block is invalid it can cause
2768          * zeroing important superblock members.
2769          */
2770         if (!SB_ONDISK_JOURNAL_DEVICE(sb) &&
2771             SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) {
2772                 reiserfs_warning(sb, "journal-1393",
2773                                  "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d",
2774                                  SB_JOURNAL_1st_RESERVED_BLOCK(sb),
2775                                  SB_ONDISK_JOURNAL_1st_BLOCK(sb));
2776                 goto free_and_return;
2777         }
2778
2779         if (journal_init_dev(sb, journal, j_dev_name) != 0) {
2780                 reiserfs_warning(sb, "sh-462",
2781                                  "unable to initialize journal device");
2782                 goto free_and_return;
2783         }
2784
2785         rs = SB_DISK_SUPER_BLOCK(sb);
2786
2787         /* read journal header */
2788         bhjh = journal_bread(sb,
2789                              SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
2790                              SB_ONDISK_JOURNAL_SIZE(sb));
2791         if (!bhjh) {
2792                 reiserfs_warning(sb, "sh-459",
2793                                  "unable to read journal header");
2794                 goto free_and_return;
2795         }
2796         jh = (struct reiserfs_journal_header *)(bhjh->b_data);
2797
2798         /* make sure that journal matches to the super block */
2799         if (is_reiserfs_jr(rs)
2800             && (le32_to_cpu(jh->jh_journal.jp_journal_magic) !=
2801                 sb_jp_journal_magic(rs))) {
2802                 reiserfs_warning(sb, "sh-460",
2803                                  "journal header magic %x (device %pg) does "
2804                                  "not match to magic found in super block %x",
2805                                  jh->jh_journal.jp_journal_magic,
2806                                  journal->j_dev_bd,
2807                                  sb_jp_journal_magic(rs));
2808                 brelse(bhjh);
2809                 goto free_and_return;
2810         }
2811
2812         journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max);
2813         journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch);
2814         journal->j_max_commit_age =
2815             le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age);
2816         journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE;
2817
2818         if (check_advise_trans_params(sb, journal) != 0)
2819                 goto free_and_return;
2820         journal->j_default_max_commit_age = journal->j_max_commit_age;
2821
2822         if (commit_max_age != 0) {
2823                 journal->j_max_commit_age = commit_max_age;
2824                 journal->j_max_trans_age = commit_max_age;
2825         }
2826
2827         reiserfs_info(sb, "journal params: device %pg, size %u, "
2828                       "journal first block %u, max trans len %u, max batch %u, "
2829                       "max commit age %u, max trans age %u\n",
2830                       journal->j_dev_bd,
2831                       SB_ONDISK_JOURNAL_SIZE(sb),
2832                       SB_ONDISK_JOURNAL_1st_BLOCK(sb),
2833                       journal->j_trans_max,
2834                       journal->j_max_batch,
2835                       journal->j_max_commit_age, journal->j_max_trans_age);
2836
2837         brelse(bhjh);
2838
2839         journal->j_list_bitmap_index = 0;
2840         journal_list_init(sb);
2841
2842         memset(journal->j_list_hash_table, 0,
2843                JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *));
2844
2845         INIT_LIST_HEAD(&journal->j_dirty_buffers);
2846         spin_lock_init(&journal->j_dirty_buffers_lock);
2847
2848         journal->j_start = 0;
2849         journal->j_len = 0;
2850         journal->j_len_alloc = 0;
2851         atomic_set(&journal->j_wcount, 0);
2852         atomic_set(&journal->j_async_throttle, 0);
2853         journal->j_bcount = 0;
2854         journal->j_trans_start_time = 0;
2855         journal->j_last = NULL;
2856         journal->j_first = NULL;
2857         init_waitqueue_head(&journal->j_join_wait);
2858         mutex_init(&journal->j_mutex);
2859         mutex_init(&journal->j_flush_mutex);
2860
2861         journal->j_trans_id = 10;
2862         journal->j_mount_id = 10;
2863         journal->j_state = 0;
2864         atomic_set(&journal->j_jlock, 0);
2865         journal->j_cnode_free_list = allocate_cnodes(num_cnodes);
2866         journal->j_cnode_free_orig = journal->j_cnode_free_list;
2867         journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0;
2868         journal->j_cnode_used = 0;
2869         journal->j_must_wait = 0;
2870
2871         if (journal->j_cnode_free == 0) {
2872                 reiserfs_warning(sb, "journal-2004", "Journal cnode memory "
2873                                  "allocation failed (%ld bytes). Journal is "
2874                                  "too large for available memory. Usually "
2875                                  "this is due to a journal that is too large.",
2876                                  sizeof (struct reiserfs_journal_cnode) * num_cnodes);
2877                 goto free_and_return;
2878         }
2879
2880         init_journal_hash(sb);
2881         jl = journal->j_current_jl;
2882
2883         /*
2884          * get_list_bitmap() may call flush_commit_list() which
2885          * requires the lock. Calling flush_commit_list() shouldn't happen
2886          * this early but I like to be paranoid.
2887          */
2888         reiserfs_write_lock(sb);
2889         jl->j_list_bitmap = get_list_bitmap(sb, jl);
2890         reiserfs_write_unlock(sb);
2891         if (!jl->j_list_bitmap) {
2892                 reiserfs_warning(sb, "journal-2005",
2893                                  "get_list_bitmap failed for journal list 0");
2894                 goto free_and_return;
2895         }
2896
2897         ret = journal_read(sb);
2898         if (ret < 0) {
2899                 reiserfs_warning(sb, "reiserfs-2006",
2900                                  "Replay Failure, unable to mount");
2901                 goto free_and_return;
2902         }
2903
2904         INIT_DELAYED_WORK(&journal->j_work, flush_async_commits);
2905         journal->j_work_sb = sb;
2906         return 0;
2907 free_and_return:
2908         free_journal_ram(sb);
2909         return 1;
2910 }
2911
2912 /*
2913  * test for a polite end of the current transaction.  Used by file_write,
2914  * and should be used by delete to make sure they don't write more than
2915  * can fit inside a single transaction
2916  */
2917 int journal_transaction_should_end(struct reiserfs_transaction_handle *th,
2918                                    int new_alloc)
2919 {
2920         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2921         time64_t now = ktime_get_seconds();
2922         /* cannot restart while nested */
2923         BUG_ON(!th->t_trans_id);
2924         if (th->t_refcount > 1)
2925                 return 0;
2926         if (journal->j_must_wait > 0 ||
2927             (journal->j_len_alloc + new_alloc) >= journal->j_max_batch ||
2928             atomic_read(&journal->j_jlock) ||
2929             (now - journal->j_trans_start_time) > journal->j_max_trans_age ||
2930             journal->j_cnode_free < (journal->j_trans_max * 3)) {
2931                 return 1;
2932         }
2933
2934         journal->j_len_alloc += new_alloc;
2935         th->t_blocks_allocated += new_alloc ;
2936         return 0;
2937 }
2938
2939 /* this must be called inside a transaction */
2940 void reiserfs_block_writes(struct reiserfs_transaction_handle *th)
2941 {
2942         struct reiserfs_journal *journal = SB_JOURNAL(th->t_super);
2943         BUG_ON(!th->t_trans_id);
2944         journal->j_must_wait = 1;
2945         set_bit(J_WRITERS_BLOCKED, &journal->j_state);
2946         return;
2947 }
2948
2949 /* this must be called without a transaction started */
2950 void reiserfs_allow_writes(struct super_block *s)
2951 {
2952         struct reiserfs_journal *journal = SB_JOURNAL(s);
2953         clear_bit(J_WRITERS_BLOCKED, &journal->j_state);
2954         wake_up(&journal->j_join_wait);
2955 }
2956
2957 /* this must be called without a transaction started */
2958 void reiserfs_wait_on_write_block(struct super_block *s)
2959 {
2960         struct reiserfs_journal *journal = SB_JOURNAL(s);
2961         wait_event(journal->j_join_wait,
2962                    !test_bit(J_WRITERS_BLOCKED, &journal->j_state));
2963 }
2964
2965 static void queue_log_writer(struct super_block *s)
2966 {
2967         wait_queue_entry_t wait;
2968         struct reiserfs_journal *journal = SB_JOURNAL(s);
2969         set_bit(J_WRITERS_QUEUED, &journal->j_state);
2970
2971         /*
2972          * we don't want to use wait_event here because
2973          * we only want to wait once.
2974          */
2975         init_waitqueue_entry(&wait, current);
2976         add_wait_queue(&journal->j_join_wait, &wait);
2977         set_current_state(TASK_UNINTERRUPTIBLE);
2978         if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) {
2979                 int depth = reiserfs_write_unlock_nested(s);
2980                 schedule();
2981                 reiserfs_write_lock_nested(s, depth);
2982         }
2983         __set_current_state(TASK_RUNNING);
2984         remove_wait_queue(&journal->j_join_wait, &wait);
2985 }
2986
2987 static void wake_queued_writers(struct super_block *s)
2988 {
2989         struct reiserfs_journal *journal = SB_JOURNAL(s);
2990         if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state))
2991                 wake_up(&journal->j_join_wait);
2992 }
2993
2994 static void let_transaction_grow(struct super_block *sb, unsigned int trans_id)
2995 {
2996         struct reiserfs_journal *journal = SB_JOURNAL(sb);
2997         unsigned long bcount = journal->j_bcount;
2998         while (1) {
2999                 int depth;
3000
3001                 depth = reiserfs_write_unlock_nested(sb);
3002                 schedule_timeout_uninterruptible(1);
3003                 reiserfs_write_lock_nested(sb, depth);
3004
3005                 journal->j_current_jl->j_state |= LIST_COMMIT_PENDING;
3006                 while ((atomic_read(&journal->j_wcount) > 0 ||
3007                         atomic_read(&journal->j_jlock)) &&
3008                        journal->j_trans_id == trans_id) {
3009                         queue_log_writer(sb);
3010                 }
3011                 if (journal->j_trans_id != trans_id)
3012                         break;
3013                 if (bcount == journal->j_bcount)
3014                         break;
3015                 bcount = journal->j_bcount;
3016         }
3017 }
3018
3019 /*
3020  * join == true if you must join an existing transaction.
3021  * join == false if you can deal with waiting for others to finish
3022  *
3023  * this will block until the transaction is joinable.  send the number of
3024  * blocks you expect to use in nblocks.
3025 */
3026 static int do_journal_begin_r(struct reiserfs_transaction_handle *th,
3027                               struct super_block *sb, unsigned long nblocks,
3028                               int join)
3029 {
3030         time64_t now = ktime_get_seconds();
3031         unsigned int old_trans_id;
3032         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3033         struct reiserfs_transaction_handle myth;
3034         int sched_count = 0;
3035         int retval;
3036         int depth;
3037
3038         reiserfs_check_lock_depth(sb, "journal_begin");
3039         BUG_ON(nblocks > journal->j_trans_max);
3040
3041         PROC_INFO_INC(sb, journal.journal_being);
3042         /* set here for journal_join */
3043         th->t_refcount = 1;
3044         th->t_super = sb;
3045
3046 relock:
3047         lock_journal(sb);
3048         if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) {
3049                 unlock_journal(sb);
3050                 retval = journal->j_errno;
3051                 goto out_fail;
3052         }
3053         journal->j_bcount++;
3054
3055         if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) {
3056                 unlock_journal(sb);
3057                 depth = reiserfs_write_unlock_nested(sb);
3058                 reiserfs_wait_on_write_block(sb);
3059                 reiserfs_write_lock_nested(sb, depth);
3060                 PROC_INFO_INC(sb, journal.journal_relock_writers);
3061                 goto relock;
3062         }
3063         now = ktime_get_seconds();
3064
3065         /*
3066          * if there is no room in the journal OR
3067          * if this transaction is too old, and we weren't called joinable,
3068          * wait for it to finish before beginning we don't sleep if there
3069          * aren't other writers
3070          */
3071
3072         if ((!join && journal->j_must_wait > 0) ||
3073             (!join
3074              && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch)
3075             || (!join && atomic_read(&journal->j_wcount) > 0
3076                 && journal->j_trans_start_time > 0
3077                 && (now - journal->j_trans_start_time) >
3078                 journal->j_max_trans_age) || (!join
3079                                               && atomic_read(&journal->j_jlock))
3080             || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) {
3081
3082                 old_trans_id = journal->j_trans_id;
3083                 /* allow others to finish this transaction */
3084                 unlock_journal(sb);
3085
3086                 if (!join && (journal->j_len_alloc + nblocks + 2) >=
3087                     journal->j_max_batch &&
3088                     ((journal->j_len + nblocks + 2) * 100) <
3089                     (journal->j_len_alloc * 75)) {
3090                         if (atomic_read(&journal->j_wcount) > 10) {
3091                                 sched_count++;
3092                                 queue_log_writer(sb);
3093                                 goto relock;
3094                         }
3095                 }
3096                 /*
3097                  * don't mess with joining the transaction if all we
3098                  * have to do is wait for someone else to do a commit
3099                  */
3100                 if (atomic_read(&journal->j_jlock)) {
3101                         while (journal->j_trans_id == old_trans_id &&
3102                                atomic_read(&journal->j_jlock)) {
3103                                 queue_log_writer(sb);
3104                         }
3105                         goto relock;
3106                 }
3107                 retval = journal_join(&myth, sb);
3108                 if (retval)
3109                         goto out_fail;
3110
3111                 /* someone might have ended the transaction while we joined */
3112                 if (old_trans_id != journal->j_trans_id) {
3113                         retval = do_journal_end(&myth, 0);
3114                 } else {
3115                         retval = do_journal_end(&myth, COMMIT_NOW);
3116                 }
3117
3118                 if (retval)
3119                         goto out_fail;
3120
3121                 PROC_INFO_INC(sb, journal.journal_relock_wcount);
3122                 goto relock;
3123         }
3124         /* we are the first writer, set trans_id */
3125         if (journal->j_trans_start_time == 0) {
3126                 journal->j_trans_start_time = ktime_get_seconds();
3127         }
3128         atomic_inc(&journal->j_wcount);
3129         journal->j_len_alloc += nblocks;
3130         th->t_blocks_logged = 0;
3131         th->t_blocks_allocated = nblocks;
3132         th->t_trans_id = journal->j_trans_id;
3133         unlock_journal(sb);
3134         INIT_LIST_HEAD(&th->t_list);
3135         return 0;
3136
3137 out_fail:
3138         memset(th, 0, sizeof(*th));
3139         /*
3140          * Re-set th->t_super, so we can properly keep track of how many
3141          * persistent transactions there are. We need to do this so if this
3142          * call is part of a failed restart_transaction, we can free it later
3143          */
3144         th->t_super = sb;
3145         return retval;
3146 }
3147
3148 struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct
3149                                                                     super_block
3150                                                                     *s,
3151                                                                     int nblocks)
3152 {
3153         int ret;
3154         struct reiserfs_transaction_handle *th;
3155
3156         /*
3157          * if we're nesting into an existing transaction.  It will be
3158          * persistent on its own
3159          */
3160         if (reiserfs_transaction_running(s)) {
3161                 th = current->journal_info;
3162                 th->t_refcount++;
3163                 BUG_ON(th->t_refcount < 2);
3164
3165                 return th;
3166         }
3167         th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS);
3168         if (!th)
3169                 return NULL;
3170         ret = journal_begin(th, s, nblocks);
3171         if (ret) {
3172                 kfree(th);
3173                 return NULL;
3174         }
3175
3176         SB_JOURNAL(s)->j_persistent_trans++;
3177         return th;
3178 }
3179
3180 int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th)
3181 {
3182         struct super_block *s = th->t_super;
3183         int ret = 0;
3184         if (th->t_trans_id)
3185                 ret = journal_end(th);
3186         else
3187                 ret = -EIO;
3188         if (th->t_refcount == 0) {
3189                 SB_JOURNAL(s)->j_persistent_trans--;
3190                 kfree(th);
3191         }
3192         return ret;
3193 }
3194
3195 static int journal_join(struct reiserfs_transaction_handle *th,
3196                         struct super_block *sb)
3197 {
3198         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3199
3200         /*
3201          * this keeps do_journal_end from NULLing out the
3202          * current->journal_info pointer
3203          */
3204         th->t_handle_save = cur_th;
3205         BUG_ON(cur_th && cur_th->t_refcount > 1);
3206         return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN);
3207 }
3208
3209 int journal_join_abort(struct reiserfs_transaction_handle *th,
3210                        struct super_block *sb)
3211 {
3212         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3213
3214         /*
3215          * this keeps do_journal_end from NULLing out the
3216          * current->journal_info pointer
3217          */
3218         th->t_handle_save = cur_th;
3219         BUG_ON(cur_th && cur_th->t_refcount > 1);
3220         return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT);
3221 }
3222
3223 int journal_begin(struct reiserfs_transaction_handle *th,
3224                   struct super_block *sb, unsigned long nblocks)
3225 {
3226         struct reiserfs_transaction_handle *cur_th = current->journal_info;
3227         int ret;
3228
3229         th->t_handle_save = NULL;
3230         if (cur_th) {
3231                 /* we are nesting into the current transaction */
3232                 if (cur_th->t_super == sb) {
3233                         BUG_ON(!cur_th->t_refcount);
3234                         cur_th->t_refcount++;
3235                         memcpy(th, cur_th, sizeof(*th));
3236                         if (th->t_refcount <= 1)
3237                                 reiserfs_warning(sb, "reiserfs-2005",
3238                                                  "BAD: refcount <= 1, but "
3239                                                  "journal_info != 0");
3240                         return 0;
3241                 } else {
3242                         /*
3243                          * we've ended up with a handle from a different
3244                          * filesystem.  save it and restore on journal_end.
3245                          * This should never really happen...
3246                          */
3247                         reiserfs_warning(sb, "clm-2100",
3248                                          "nesting info a different FS");
3249                         th->t_handle_save = current->journal_info;
3250                         current->journal_info = th;
3251                 }
3252         } else {
3253                 current->journal_info = th;
3254         }
3255         ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG);
3256         BUG_ON(current->journal_info != th);
3257
3258         /*
3259          * I guess this boils down to being the reciprocal of clm-2100 above.
3260          * If do_journal_begin_r fails, we need to put it back, since
3261          * journal_end won't be called to do it. */
3262         if (ret)
3263                 current->journal_info = th->t_handle_save;
3264         else
3265                 BUG_ON(!th->t_refcount);
3266
3267         return ret;
3268 }
3269
3270 /*
3271  * puts bh into the current transaction.  If it was already there, reorders
3272  * removes the old pointers from the hash, and puts new ones in (to make
3273  * sure replay happen in the right order).
3274  *
3275  * if it was dirty, cleans and files onto the clean list.  I can't let it
3276  * be dirty again until the transaction is committed.
3277  *
3278  * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len.
3279  */
3280 int journal_mark_dirty(struct reiserfs_transaction_handle *th,
3281                        struct buffer_head *bh)
3282 {
3283         struct super_block *sb = th->t_super;
3284         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3285         struct reiserfs_journal_cnode *cn = NULL;
3286         int count_already_incd = 0;
3287         int prepared = 0;
3288         BUG_ON(!th->t_trans_id);
3289
3290         PROC_INFO_INC(sb, journal.mark_dirty);
3291         if (th->t_trans_id != journal->j_trans_id) {
3292                 reiserfs_panic(th->t_super, "journal-1577",
3293                                "handle trans id %ld != current trans id %ld",
3294                                th->t_trans_id, journal->j_trans_id);
3295         }
3296
3297         prepared = test_clear_buffer_journal_prepared(bh);
3298         clear_buffer_journal_restore_dirty(bh);
3299         /* already in this transaction, we are done */
3300         if (buffer_journaled(bh)) {
3301                 PROC_INFO_INC(sb, journal.mark_dirty_already);
3302                 return 0;
3303         }
3304
3305         /*
3306          * this must be turned into a panic instead of a warning.  We can't
3307          * allow a dirty or journal_dirty or locked buffer to be logged, as
3308          * some changes could get to disk too early.  NOT GOOD.
3309          */
3310         if (!prepared || buffer_dirty(bh)) {
3311                 reiserfs_warning(sb, "journal-1777",
3312                                  "buffer %llu bad state "
3313                                  "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT",
3314                                  (unsigned long long)bh->b_blocknr,
3315                                  prepared ? ' ' : '!',
3316                                  buffer_locked(bh) ? ' ' : '!',
3317                                  buffer_dirty(bh) ? ' ' : '!',
3318                                  buffer_journal_dirty(bh) ? ' ' : '!');
3319         }
3320
3321         if (atomic_read(&journal->j_wcount) <= 0) {
3322                 reiserfs_warning(sb, "journal-1409",
3323                                  "returning because j_wcount was %d",
3324                                  atomic_read(&journal->j_wcount));
3325                 return 1;
3326         }
3327         /*
3328          * this error means I've screwed up, and we've overflowed
3329          * the transaction.  Nothing can be done here, except make the
3330          * FS readonly or panic.
3331          */
3332         if (journal->j_len >= journal->j_trans_max) {
3333                 reiserfs_panic(th->t_super, "journal-1413",
3334                                "j_len (%lu) is too big",
3335                                journal->j_len);
3336         }
3337
3338         if (buffer_journal_dirty(bh)) {
3339                 count_already_incd = 1;
3340                 PROC_INFO_INC(sb, journal.mark_dirty_notjournal);
3341                 clear_buffer_journal_dirty(bh);
3342         }
3343
3344         if (journal->j_len > journal->j_len_alloc) {
3345                 journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT;
3346         }
3347
3348         set_buffer_journaled(bh);
3349
3350         /* now put this guy on the end */
3351         if (!cn) {
3352                 cn = get_cnode(sb);
3353                 if (!cn) {
3354                         reiserfs_panic(sb, "journal-4", "get_cnode failed!");
3355                 }
3356
3357                 if (th->t_blocks_logged == th->t_blocks_allocated) {
3358                         th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT;
3359                         journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT;
3360                 }
3361                 th->t_blocks_logged++;
3362                 journal->j_len++;
3363
3364                 cn->bh = bh;
3365                 cn->blocknr = bh->b_blocknr;
3366                 cn->sb = sb;
3367                 cn->jlist = NULL;
3368                 insert_journal_hash(journal->j_hash_table, cn);
3369                 if (!count_already_incd) {
3370                         get_bh(bh);
3371                 }
3372         }
3373         cn->next = NULL;
3374         cn->prev = journal->j_last;
3375         cn->bh = bh;
3376         if (journal->j_last) {
3377                 journal->j_last->next = cn;
3378                 journal->j_last = cn;
3379         } else {
3380                 journal->j_first = cn;
3381                 journal->j_last = cn;
3382         }
3383         reiserfs_schedule_old_flush(sb);
3384         return 0;
3385 }
3386
3387 int journal_end(struct reiserfs_transaction_handle *th)
3388 {
3389         struct super_block *sb = th->t_super;
3390         if (!current->journal_info && th->t_refcount > 1)
3391                 reiserfs_warning(sb, "REISER-NESTING",
3392                                  "th NULL, refcount %d", th->t_refcount);
3393
3394         if (!th->t_trans_id) {
3395                 WARN_ON(1);
3396                 return -EIO;
3397         }
3398
3399         th->t_refcount--;
3400         if (th->t_refcount > 0) {
3401                 struct reiserfs_transaction_handle *cur_th =
3402                     current->journal_info;
3403
3404                 /*
3405                  * we aren't allowed to close a nested transaction on a
3406                  * different filesystem from the one in the task struct
3407                  */
3408                 BUG_ON(cur_th->t_super != th->t_super);
3409
3410                 if (th != cur_th) {
3411                         memcpy(current->journal_info, th, sizeof(*th));
3412                         th->t_trans_id = 0;
3413                 }
3414                 return 0;
3415         } else {
3416                 return do_journal_end(th, 0);
3417         }
3418 }
3419
3420 /*
3421  * removes from the current transaction, relsing and descrementing any counters.
3422  * also files the removed buffer directly onto the clean list
3423  *
3424  * called by journal_mark_freed when a block has been deleted
3425  *
3426  * returns 1 if it cleaned and relsed the buffer. 0 otherwise
3427  */
3428 static int remove_from_transaction(struct super_block *sb,
3429                                    b_blocknr_t blocknr, int already_cleaned)
3430 {
3431         struct buffer_head *bh;
3432         struct reiserfs_journal_cnode *cn;
3433         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3434         int ret = 0;
3435
3436         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3437         if (!cn || !cn->bh) {
3438                 return ret;
3439         }
3440         bh = cn->bh;
3441         if (cn->prev) {
3442                 cn->prev->next = cn->next;
3443         }
3444         if (cn->next) {
3445                 cn->next->prev = cn->prev;
3446         }
3447         if (cn == journal->j_first) {
3448                 journal->j_first = cn->next;
3449         }
3450         if (cn == journal->j_last) {
3451                 journal->j_last = cn->prev;
3452         }
3453         remove_journal_hash(sb, journal->j_hash_table, NULL,
3454                             bh->b_blocknr, 0);
3455         clear_buffer_journaled(bh);     /* don't log this one */
3456
3457         if (!already_cleaned) {
3458                 clear_buffer_journal_dirty(bh);
3459                 clear_buffer_dirty(bh);
3460                 clear_buffer_journal_test(bh);
3461                 put_bh(bh);
3462                 if (atomic_read(&bh->b_count) < 0) {
3463                         reiserfs_warning(sb, "journal-1752",
3464                                          "b_count < 0");
3465                 }
3466                 ret = 1;
3467         }
3468         journal->j_len--;
3469         journal->j_len_alloc--;
3470         free_cnode(sb, cn);
3471         return ret;
3472 }
3473
3474 /*
3475  * for any cnode in a journal list, it can only be dirtied of all the
3476  * transactions that include it are committed to disk.
3477  * this checks through each transaction, and returns 1 if you are allowed
3478  * to dirty, and 0 if you aren't
3479  *
3480  * it is called by dirty_journal_list, which is called after
3481  * flush_commit_list has gotten all the log blocks for a given
3482  * transaction on disk
3483  *
3484  */
3485 static int can_dirty(struct reiserfs_journal_cnode *cn)
3486 {
3487         struct super_block *sb = cn->sb;
3488         b_blocknr_t blocknr = cn->blocknr;
3489         struct reiserfs_journal_cnode *cur = cn->hprev;
3490         int can_dirty = 1;
3491
3492         /*
3493          * first test hprev.  These are all newer than cn, so any node here
3494          * with the same block number and dev means this node can't be sent
3495          * to disk right now.
3496          */
3497         while (cur && can_dirty) {
3498                 if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb &&
3499                     cur->blocknr == blocknr) {
3500                         can_dirty = 0;
3501                 }
3502                 cur = cur->hprev;
3503         }
3504         /*
3505          * then test hnext.  These are all older than cn.  As long as they
3506          * are committed to the log, it is safe to write cn to disk
3507          */
3508         cur = cn->hnext;
3509         while (cur && can_dirty) {
3510                 if (cur->jlist && cur->jlist->j_len > 0 &&
3511                     atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh &&
3512                     cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) {
3513                         can_dirty = 0;
3514                 }
3515                 cur = cur->hnext;
3516         }
3517         return can_dirty;
3518 }
3519
3520 /*
3521  * syncs the commit blocks, but does not force the real buffers to disk
3522  * will wait until the current transaction is done/committed before returning
3523  */
3524 int journal_end_sync(struct reiserfs_transaction_handle *th)
3525 {
3526         struct super_block *sb = th->t_super;
3527         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3528
3529         BUG_ON(!th->t_trans_id);
3530         /* you can sync while nested, very, very bad */
3531         BUG_ON(th->t_refcount > 1);
3532         if (journal->j_len == 0) {
3533                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3534                                              1);
3535                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
3536         }
3537         return do_journal_end(th, COMMIT_NOW | WAIT);
3538 }
3539
3540 /* writeback the pending async commits to disk */
3541 static void flush_async_commits(struct work_struct *work)
3542 {
3543         struct reiserfs_journal *journal =
3544                 container_of(work, struct reiserfs_journal, j_work.work);
3545         struct super_block *sb = journal->j_work_sb;
3546         struct reiserfs_journal_list *jl;
3547         struct list_head *entry;
3548
3549         reiserfs_write_lock(sb);
3550         if (!list_empty(&journal->j_journal_list)) {
3551                 /* last entry is the youngest, commit it and you get everything */
3552                 entry = journal->j_journal_list.prev;
3553                 jl = JOURNAL_LIST_ENTRY(entry);
3554                 flush_commit_list(sb, jl, 1);
3555         }
3556         reiserfs_write_unlock(sb);
3557 }
3558
3559 /*
3560  * flushes any old transactions to disk
3561  * ends the current transaction if it is too old
3562  */
3563 void reiserfs_flush_old_commits(struct super_block *sb)
3564 {
3565         time64_t now;
3566         struct reiserfs_transaction_handle th;
3567         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3568
3569         now = ktime_get_seconds();
3570         /*
3571          * safety check so we don't flush while we are replaying the log during
3572          * mount
3573          */
3574         if (list_empty(&journal->j_journal_list))
3575                 return;
3576
3577         /*
3578          * check the current transaction.  If there are no writers, and it is
3579          * too old, finish it, and force the commit blocks to disk
3580          */
3581         if (atomic_read(&journal->j_wcount) <= 0 &&
3582             journal->j_trans_start_time > 0 &&
3583             journal->j_len > 0 &&
3584             (now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3585                 if (!journal_join(&th, sb)) {
3586                         reiserfs_prepare_for_journal(sb,
3587                                                      SB_BUFFER_WITH_SB(sb),
3588                                                      1);
3589                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3590
3591                         /*
3592                          * we're only being called from kreiserfsd, it makes
3593                          * no sense to do an async commit so that kreiserfsd
3594                          * can do it later
3595                          */
3596                         do_journal_end(&th, COMMIT_NOW | WAIT);
3597                 }
3598         }
3599 }
3600
3601 /*
3602  * returns 0 if do_journal_end should return right away, returns 1 if
3603  * do_journal_end should finish the commit
3604  *
3605  * if the current transaction is too old, but still has writers, this will
3606  * wait on j_join_wait until all the writers are done.  By the time it
3607  * wakes up, the transaction it was called has already ended, so it just
3608  * flushes the commit list and returns 0.
3609  *
3610  * Won't batch when flush or commit_now is set.  Also won't batch when
3611  * others are waiting on j_join_wait.
3612  *
3613  * Note, we can't allow the journal_end to proceed while there are still
3614  * writers in the log.
3615  */
3616 static int check_journal_end(struct reiserfs_transaction_handle *th, int flags)
3617 {
3618
3619         time64_t now;
3620         int flush = flags & FLUSH_ALL;
3621         int commit_now = flags & COMMIT_NOW;
3622         int wait_on_commit = flags & WAIT;
3623         struct reiserfs_journal_list *jl;
3624         struct super_block *sb = th->t_super;
3625         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3626
3627         BUG_ON(!th->t_trans_id);
3628
3629         if (th->t_trans_id != journal->j_trans_id) {
3630                 reiserfs_panic(th->t_super, "journal-1577",
3631                                "handle trans id %ld != current trans id %ld",
3632                                th->t_trans_id, journal->j_trans_id);
3633         }
3634
3635         journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged);
3636         /* <= 0 is allowed.  unmounting might not call begin */
3637         if (atomic_read(&journal->j_wcount) > 0)
3638                 atomic_dec(&journal->j_wcount);
3639
3640         /*
3641          * BUG, deal with case where j_len is 0, but people previously
3642          * freed blocks need to be released will be dealt with by next
3643          * transaction that actually writes something, but should be taken
3644          * care of in this trans
3645          */
3646         BUG_ON(journal->j_len == 0);
3647
3648         /*
3649          * if wcount > 0, and we are called to with flush or commit_now,
3650          * we wait on j_join_wait.  We will wake up when the last writer has
3651          * finished the transaction, and started it on its way to the disk.
3652          * Then, we flush the commit or journal list, and just return 0
3653          * because the rest of journal end was already done for this
3654          * transaction.
3655          */
3656         if (atomic_read(&journal->j_wcount) > 0) {
3657                 if (flush || commit_now) {
3658                         unsigned trans_id;
3659
3660                         jl = journal->j_current_jl;
3661                         trans_id = jl->j_trans_id;
3662                         if (wait_on_commit)
3663                                 jl->j_state |= LIST_COMMIT_PENDING;
3664                         atomic_set(&journal->j_jlock, 1);
3665                         if (flush) {
3666                                 journal->j_next_full_flush = 1;
3667                         }
3668                         unlock_journal(sb);
3669
3670                         /*
3671                          * sleep while the current transaction is
3672                          * still j_jlocked
3673                          */
3674                         while (journal->j_trans_id == trans_id) {
3675                                 if (atomic_read(&journal->j_jlock)) {
3676                                         queue_log_writer(sb);
3677                                 } else {
3678                                         lock_journal(sb);
3679                                         if (journal->j_trans_id == trans_id) {
3680                                                 atomic_set(&journal->j_jlock,
3681                                                            1);
3682                                         }
3683                                         unlock_journal(sb);
3684                                 }
3685                         }
3686                         BUG_ON(journal->j_trans_id == trans_id);
3687
3688                         if (commit_now
3689                             && journal_list_still_alive(sb, trans_id)
3690                             && wait_on_commit) {
3691                                 flush_commit_list(sb, jl, 1);
3692                         }
3693                         return 0;
3694                 }
3695                 unlock_journal(sb);
3696                 return 0;
3697         }
3698
3699         /* deal with old transactions where we are the last writers */
3700         now = ktime_get_seconds();
3701         if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) {
3702                 commit_now = 1;
3703                 journal->j_next_async_flush = 1;
3704         }
3705         /* don't batch when someone is waiting on j_join_wait */
3706         /* don't batch when syncing the commit or flushing the whole trans */
3707         if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock))
3708             && !flush && !commit_now && (journal->j_len < journal->j_max_batch)
3709             && journal->j_len_alloc < journal->j_max_batch
3710             && journal->j_cnode_free > (journal->j_trans_max * 3)) {
3711                 journal->j_bcount++;
3712                 unlock_journal(sb);
3713                 return 0;
3714         }
3715
3716         if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) {
3717                 reiserfs_panic(sb, "journal-003",
3718                                "j_start (%ld) is too high",
3719                                journal->j_start);
3720         }
3721         return 1;
3722 }
3723
3724 /*
3725  * Does all the work that makes deleting blocks safe.
3726  * when deleting a block mark BH_JNew, just remove it from the current
3727  * transaction, clean it's buffer_head and move on.
3728  *
3729  * otherwise:
3730  * set a bit for the block in the journal bitmap.  That will prevent it from
3731  * being allocated for unformatted nodes before this transaction has finished.
3732  *
3733  * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers.
3734  * That will prevent any old transactions with this block from trying to flush
3735  * to the real location.  Since we aren't removing the cnode from the
3736  * journal_list_hash, *the block can't be reallocated yet.
3737  *
3738  * Then remove it from the current transaction, decrementing any counters and
3739  * filing it on the clean list.
3740  */
3741 int journal_mark_freed(struct reiserfs_transaction_handle *th,
3742                        struct super_block *sb, b_blocknr_t blocknr)
3743 {
3744         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3745         struct reiserfs_journal_cnode *cn = NULL;
3746         struct buffer_head *bh = NULL;
3747         struct reiserfs_list_bitmap *jb = NULL;
3748         int cleaned = 0;
3749         BUG_ON(!th->t_trans_id);
3750
3751         cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr);
3752         if (cn && cn->bh) {
3753                 bh = cn->bh;
3754                 get_bh(bh);
3755         }
3756         /* if it is journal new, we just remove it from this transaction */
3757         if (bh && buffer_journal_new(bh)) {
3758                 clear_buffer_journal_new(bh);
3759                 clear_prepared_bits(bh);
3760                 reiserfs_clean_and_file_buffer(bh);
3761                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3762         } else {
3763                 /*
3764                  * set the bit for this block in the journal bitmap
3765                  * for this transaction
3766                  */
3767                 jb = journal->j_current_jl->j_list_bitmap;
3768                 if (!jb) {
3769                         reiserfs_panic(sb, "journal-1702",
3770                                        "journal_list_bitmap is NULL");
3771                 }
3772                 set_bit_in_list_bitmap(sb, blocknr, jb);
3773
3774                 /* Note, the entire while loop is not allowed to schedule.  */
3775
3776                 if (bh) {
3777                         clear_prepared_bits(bh);
3778                         reiserfs_clean_and_file_buffer(bh);
3779                 }
3780                 cleaned = remove_from_transaction(sb, blocknr, cleaned);
3781
3782                 /*
3783                  * find all older transactions with this block,
3784                  * make sure they don't try to write it out
3785                  */
3786                 cn = get_journal_hash_dev(sb, journal->j_list_hash_table,
3787                                           blocknr);
3788                 while (cn) {
3789                         if (sb == cn->sb && blocknr == cn->blocknr) {
3790                                 set_bit(BLOCK_FREED, &cn->state);
3791                                 if (cn->bh) {
3792                                         /*
3793                                          * remove_from_transaction will brelse
3794                                          * the buffer if it was in the current
3795                                          * trans
3796                                          */
3797                                         if (!cleaned) {
3798                                                 clear_buffer_journal_dirty(cn->
3799                                                                            bh);
3800                                                 clear_buffer_dirty(cn->bh);
3801                                                 clear_buffer_journal_test(cn->
3802                                                                           bh);
3803                                                 cleaned = 1;
3804                                                 put_bh(cn->bh);
3805                                                 if (atomic_read
3806                                                     (&cn->bh->b_count) < 0) {
3807                                                         reiserfs_warning(sb,
3808                                                                  "journal-2138",
3809                                                                  "cn->bh->b_count < 0");
3810                                                 }
3811                                         }
3812                                         /*
3813                                          * since we are clearing the bh,
3814                                          * we MUST dec nonzerolen
3815                                          */
3816                                         if (cn->jlist) {
3817                                                 atomic_dec(&cn->jlist->
3818                                                            j_nonzerolen);
3819                                         }
3820                                         cn->bh = NULL;
3821                                 }
3822                         }
3823                         cn = cn->hnext;
3824                 }
3825         }
3826
3827         if (bh)
3828                 release_buffer_page(bh); /* get_hash grabs the buffer */
3829         return 0;
3830 }
3831
3832 void reiserfs_update_inode_transaction(struct inode *inode)
3833 {
3834         struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb);
3835         REISERFS_I(inode)->i_jl = journal->j_current_jl;
3836         REISERFS_I(inode)->i_trans_id = journal->j_trans_id;
3837 }
3838
3839 /*
3840  * returns -1 on error, 0 if no commits/barriers were done and 1
3841  * if a transaction was actually committed and the barrier was done
3842  */
3843 static int __commit_trans_jl(struct inode *inode, unsigned long id,
3844                              struct reiserfs_journal_list *jl)
3845 {
3846         struct reiserfs_transaction_handle th;
3847         struct super_block *sb = inode->i_sb;
3848         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3849         int ret = 0;
3850
3851         /*
3852          * is it from the current transaction,
3853          * or from an unknown transaction?
3854          */
3855         if (id == journal->j_trans_id) {
3856                 jl = journal->j_current_jl;
3857                 /*
3858                  * try to let other writers come in and
3859                  * grow this transaction
3860                  */
3861                 let_transaction_grow(sb, id);
3862                 if (journal->j_trans_id != id) {
3863                         goto flush_commit_only;
3864                 }
3865
3866                 ret = journal_begin(&th, sb, 1);
3867                 if (ret)
3868                         return ret;
3869
3870                 /* someone might have ended this transaction while we joined */
3871                 if (journal->j_trans_id != id) {
3872                         reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
3873                                                      1);
3874                         journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb));
3875                         ret = journal_end(&th);
3876                         goto flush_commit_only;
3877                 }
3878
3879                 ret = journal_end_sync(&th);
3880                 if (!ret)
3881                         ret = 1;
3882
3883         } else {
3884                 /*
3885                  * this gets tricky, we have to make sure the journal list in
3886                  * the inode still exists.  We know the list is still around
3887                  * if we've got a larger transaction id than the oldest list
3888                  */
3889 flush_commit_only:
3890                 if (journal_list_still_alive(inode->i_sb, id)) {
3891                         /*
3892                          * we only set ret to 1 when we know for sure
3893                          * the barrier hasn't been started yet on the commit
3894                          * block.
3895                          */
3896                         if (atomic_read(&jl->j_commit_left) > 1)
3897                                 ret = 1;
3898                         flush_commit_list(sb, jl, 1);
3899                         if (journal->j_errno)
3900                                 ret = journal->j_errno;
3901                 }
3902         }
3903         /* otherwise the list is gone, and long since committed */
3904         return ret;
3905 }
3906
3907 int reiserfs_commit_for_inode(struct inode *inode)
3908 {
3909         unsigned int id = REISERFS_I(inode)->i_trans_id;
3910         struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl;
3911
3912         /*
3913          * for the whole inode, assume unset id means it was
3914          * changed in the current transaction.  More conservative
3915          */
3916         if (!id || !jl) {
3917                 reiserfs_update_inode_transaction(inode);
3918                 id = REISERFS_I(inode)->i_trans_id;
3919                 /* jl will be updated in __commit_trans_jl */
3920         }
3921
3922         return __commit_trans_jl(inode, id, jl);
3923 }
3924
3925 void reiserfs_restore_prepared_buffer(struct super_block *sb,
3926                                       struct buffer_head *bh)
3927 {
3928         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3929         PROC_INFO_INC(sb, journal.restore_prepared);
3930         if (!bh) {
3931                 return;
3932         }
3933         if (test_clear_buffer_journal_restore_dirty(bh) &&
3934             buffer_journal_dirty(bh)) {
3935                 struct reiserfs_journal_cnode *cn;
3936                 reiserfs_write_lock(sb);
3937                 cn = get_journal_hash_dev(sb,
3938                                           journal->j_list_hash_table,
3939                                           bh->b_blocknr);
3940                 if (cn && can_dirty(cn)) {
3941                         set_buffer_journal_test(bh);
3942                         mark_buffer_dirty(bh);
3943                 }
3944                 reiserfs_write_unlock(sb);
3945         }
3946         clear_buffer_journal_prepared(bh);
3947 }
3948
3949 extern struct tree_balance *cur_tb;
3950 /*
3951  * before we can change a metadata block, we have to make sure it won't
3952  * be written to disk while we are altering it.  So, we must:
3953  * clean it
3954  * wait on it.
3955  */
3956 int reiserfs_prepare_for_journal(struct super_block *sb,
3957                                  struct buffer_head *bh, int wait)
3958 {
3959         PROC_INFO_INC(sb, journal.prepare);
3960
3961         if (!trylock_buffer(bh)) {
3962                 if (!wait)
3963                         return 0;
3964                 lock_buffer(bh);
3965         }
3966         set_buffer_journal_prepared(bh);
3967         if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) {
3968                 clear_buffer_journal_test(bh);
3969                 set_buffer_journal_restore_dirty(bh);
3970         }
3971         unlock_buffer(bh);
3972         return 1;
3973 }
3974
3975 /*
3976  * long and ugly.  If flush, will not return until all commit
3977  * blocks and all real buffers in the trans are on disk.
3978  * If no_async, won't return until all commit blocks are on disk.
3979  *
3980  * keep reading, there are comments as you go along
3981  *
3982  * If the journal is aborted, we just clean up. Things like flushing
3983  * journal lists, etc just won't happen.
3984  */
3985 static int do_journal_end(struct reiserfs_transaction_handle *th, int flags)
3986 {
3987         struct super_block *sb = th->t_super;
3988         struct reiserfs_journal *journal = SB_JOURNAL(sb);
3989         struct reiserfs_journal_cnode *cn, *next, *jl_cn;
3990         struct reiserfs_journal_cnode *last_cn = NULL;
3991         struct reiserfs_journal_desc *desc;
3992         struct reiserfs_journal_commit *commit;
3993         struct buffer_head *c_bh;       /* commit bh */
3994         struct buffer_head *d_bh;       /* desc bh */
3995         int cur_write_start = 0;        /* start index of current log write */
3996         int i;
3997         int flush;
3998         int wait_on_commit;
3999         struct reiserfs_journal_list *jl, *temp_jl;
4000         struct list_head *entry, *safe;
4001         unsigned long jindex;
4002         unsigned int commit_trans_id;
4003         int trans_half;
4004         int depth;
4005
4006         BUG_ON(th->t_refcount > 1);
4007         BUG_ON(!th->t_trans_id);
4008         BUG_ON(!th->t_super);
4009
4010         /*
4011          * protect flush_older_commits from doing mistakes if the
4012          * transaction ID counter gets overflowed.
4013          */
4014         if (th->t_trans_id == ~0U)
4015                 flags |= FLUSH_ALL | COMMIT_NOW | WAIT;
4016         flush = flags & FLUSH_ALL;
4017         wait_on_commit = flags & WAIT;
4018
4019         current->journal_info = th->t_handle_save;
4020         reiserfs_check_lock_depth(sb, "journal end");
4021         if (journal->j_len == 0) {
4022                 reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb),
4023                                              1);
4024                 journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb));
4025         }
4026
4027         lock_journal(sb);
4028         if (journal->j_next_full_flush) {
4029                 flags |= FLUSH_ALL;
4030                 flush = 1;
4031         }
4032         if (journal->j_next_async_flush) {
4033                 flags |= COMMIT_NOW | WAIT;
4034                 wait_on_commit = 1;
4035         }
4036
4037         /*
4038          * check_journal_end locks the journal, and unlocks if it does
4039          * not return 1 it tells us if we should continue with the
4040          * journal_end, or just return
4041          */
4042         if (!check_journal_end(th, flags)) {
4043                 reiserfs_schedule_old_flush(sb);
4044                 wake_queued_writers(sb);
4045                 reiserfs_async_progress_wait(sb);
4046                 goto out;
4047         }
4048
4049         /* check_journal_end might set these, check again */
4050         if (journal->j_next_full_flush) {
4051                 flush = 1;
4052         }
4053
4054         /*
4055          * j must wait means we have to flush the log blocks, and the
4056          * real blocks for this transaction
4057          */
4058         if (journal->j_must_wait > 0) {
4059                 flush = 1;
4060         }
4061 #ifdef REISERFS_PREALLOCATE
4062         /*
4063          * quota ops might need to nest, setup the journal_info pointer
4064          * for them and raise the refcount so that it is > 0.
4065          */
4066         current->journal_info = th;
4067         th->t_refcount++;
4068
4069         /* it should not involve new blocks into the transaction */
4070         reiserfs_discard_all_prealloc(th);
4071
4072         th->t_refcount--;
4073         current->journal_info = th->t_handle_save;
4074 #endif
4075
4076         /* setup description block */
4077         d_bh =
4078             journal_getblk(sb,
4079                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4080                            journal->j_start);
4081         set_buffer_uptodate(d_bh);
4082         desc = (struct reiserfs_journal_desc *)(d_bh)->b_data;
4083         memset(d_bh->b_data, 0, d_bh->b_size);
4084         memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8);
4085         set_desc_trans_id(desc, journal->j_trans_id);
4086
4087         /*
4088          * setup commit block.  Don't write (keep it clean too) this one
4089          * until after everyone else is written
4090          */
4091         c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4092                               ((journal->j_start + journal->j_len +
4093                                 1) % SB_ONDISK_JOURNAL_SIZE(sb)));
4094         commit = (struct reiserfs_journal_commit *)c_bh->b_data;
4095         memset(c_bh->b_data, 0, c_bh->b_size);
4096         set_commit_trans_id(commit, journal->j_trans_id);
4097         set_buffer_uptodate(c_bh);
4098
4099         /* init this journal list */
4100         jl = journal->j_current_jl;
4101
4102         /*
4103          * we lock the commit before doing anything because
4104          * we want to make sure nobody tries to run flush_commit_list until
4105          * the new transaction is fully setup, and we've already flushed the
4106          * ordered bh list
4107          */
4108         reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb);
4109
4110         /* save the transaction id in case we need to commit it later */
4111         commit_trans_id = jl->j_trans_id;
4112
4113         atomic_set(&jl->j_older_commits_done, 0);
4114         jl->j_trans_id = journal->j_trans_id;
4115         jl->j_timestamp = journal->j_trans_start_time;
4116         jl->j_commit_bh = c_bh;
4117         jl->j_start = journal->j_start;
4118         jl->j_len = journal->j_len;
4119         atomic_set(&jl->j_nonzerolen, journal->j_len);
4120         atomic_set(&jl->j_commit_left, journal->j_len + 2);
4121         jl->j_realblock = NULL;
4122
4123         /*
4124          * The ENTIRE FOR LOOP MUST not cause schedule to occur.
4125          * for each real block, add it to the journal list hash,
4126          * copy into real block index array in the commit or desc block
4127          */
4128         trans_half = journal_trans_half(sb->s_blocksize);
4129         for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) {
4130                 if (buffer_journaled(cn->bh)) {
4131                         jl_cn = get_cnode(sb);
4132                         if (!jl_cn) {
4133                                 reiserfs_panic(sb, "journal-1676",
4134                                                "get_cnode returned NULL");
4135                         }
4136                         if (i == 0) {
4137                                 jl->j_realblock = jl_cn;
4138                         }
4139                         jl_cn->prev = last_cn;
4140                         jl_cn->next = NULL;
4141                         if (last_cn) {
4142                                 last_cn->next = jl_cn;
4143                         }
4144                         last_cn = jl_cn;
4145                         /*
4146                          * make sure the block we are trying to log
4147                          * is not a block of journal or reserved area
4148                          */
4149                         if (is_block_in_log_or_reserved_area
4150                             (sb, cn->bh->b_blocknr)) {
4151                                 reiserfs_panic(sb, "journal-2332",
4152                                                "Trying to log block %lu, "
4153                                                "which is a log block",
4154                                                cn->bh->b_blocknr);
4155                         }
4156                         jl_cn->blocknr = cn->bh->b_blocknr;
4157                         jl_cn->state = 0;
4158                         jl_cn->sb = sb;
4159                         jl_cn->bh = cn->bh;
4160                         jl_cn->jlist = jl;
4161                         insert_journal_hash(journal->j_list_hash_table, jl_cn);
4162                         if (i < trans_half) {
4163                                 desc->j_realblock[i] =
4164                                     cpu_to_le32(cn->bh->b_blocknr);
4165                         } else {
4166                                 commit->j_realblock[i - trans_half] =
4167                                     cpu_to_le32(cn->bh->b_blocknr);
4168                         }
4169                 } else {
4170                         i--;
4171                 }
4172         }
4173         set_desc_trans_len(desc, journal->j_len);
4174         set_desc_mount_id(desc, journal->j_mount_id);
4175         set_desc_trans_id(desc, journal->j_trans_id);
4176         set_commit_trans_len(commit, journal->j_len);
4177
4178         /*
4179          * special check in case all buffers in the journal
4180          * were marked for not logging
4181          */
4182         BUG_ON(journal->j_len == 0);
4183
4184         /*
4185          * we're about to dirty all the log blocks, mark the description block
4186          * dirty now too.  Don't mark the commit block dirty until all the
4187          * others are on disk
4188          */
4189         mark_buffer_dirty(d_bh);
4190
4191         /*
4192          * first data block is j_start + 1, so add one to
4193          * cur_write_start wherever you use it
4194          */
4195         cur_write_start = journal->j_start;
4196         cn = journal->j_first;
4197         jindex = 1;     /* start at one so we don't get the desc again */
4198         while (cn) {
4199                 clear_buffer_journal_new(cn->bh);
4200                 /* copy all the real blocks into log area.  dirty log blocks */
4201                 if (buffer_journaled(cn->bh)) {
4202                         struct buffer_head *tmp_bh;
4203                         char *addr;
4204                         struct page *page;
4205                         tmp_bh =
4206                             journal_getblk(sb,
4207                                            SB_ONDISK_JOURNAL_1st_BLOCK(sb) +
4208                                            ((cur_write_start +
4209                                              jindex) %
4210                                             SB_ONDISK_JOURNAL_SIZE(sb)));
4211                         set_buffer_uptodate(tmp_bh);
4212                         page = cn->bh->b_page;
4213                         addr = kmap(page);
4214                         memcpy(tmp_bh->b_data,
4215                                addr + offset_in_page(cn->bh->b_data),
4216                                cn->bh->b_size);
4217                         kunmap(page);
4218                         mark_buffer_dirty(tmp_bh);
4219                         jindex++;
4220                         set_buffer_journal_dirty(cn->bh);
4221                         clear_buffer_journaled(cn->bh);
4222                 } else {
4223                         /*
4224                          * JDirty cleared sometime during transaction.
4225                          * don't log this one
4226                          */
4227                         reiserfs_warning(sb, "journal-2048",
4228                                          "BAD, buffer in journal hash, "
4229                                          "but not JDirty!");
4230                         brelse(cn->bh);
4231                 }
4232                 next = cn->next;
4233                 free_cnode(sb, cn);
4234                 cn = next;
4235                 reiserfs_cond_resched(sb);
4236         }
4237
4238         /*
4239          * we are done with both the c_bh and d_bh, but
4240          * c_bh must be written after all other commit blocks,
4241          * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1.
4242          */
4243
4244         journal->j_current_jl = alloc_journal_list(sb);
4245
4246         /* now it is safe to insert this transaction on the main list */
4247         list_add_tail(&jl->j_list, &journal->j_journal_list);
4248         list_add_tail(&jl->j_working_list, &journal->j_working_list);
4249         journal->j_num_work_lists++;
4250
4251         /* reset journal values for the next transaction */
4252         journal->j_start =
4253             (journal->j_start + journal->j_len +
4254              2) % SB_ONDISK_JOURNAL_SIZE(sb);
4255         atomic_set(&journal->j_wcount, 0);
4256         journal->j_bcount = 0;
4257         journal->j_last = NULL;
4258         journal->j_first = NULL;
4259         journal->j_len = 0;
4260         journal->j_trans_start_time = 0;
4261         /* check for trans_id overflow */
4262         if (++journal->j_trans_id == 0)
4263                 journal->j_trans_id = 10;
4264         journal->j_current_jl->j_trans_id = journal->j_trans_id;
4265         journal->j_must_wait = 0;
4266         journal->j_len_alloc = 0;
4267         journal->j_next_full_flush = 0;
4268         journal->j_next_async_flush = 0;
4269         init_journal_hash(sb);
4270
4271         /*
4272          * make sure reiserfs_add_jh sees the new current_jl before we
4273          * write out the tails
4274          */
4275         smp_mb();
4276
4277         /*
4278          * tail conversion targets have to hit the disk before we end the
4279          * transaction.  Otherwise a later transaction might repack the tail
4280          * before this transaction commits, leaving the data block unflushed
4281          * and clean, if we crash before the later transaction commits, the
4282          * data block is lost.
4283          */
4284         if (!list_empty(&jl->j_tail_bh_list)) {
4285                 depth = reiserfs_write_unlock_nested(sb);
4286                 write_ordered_buffers(&journal->j_dirty_buffers_lock,
4287                                       journal, jl, &jl->j_tail_bh_list);
4288                 reiserfs_write_lock_nested(sb, depth);
4289         }
4290         BUG_ON(!list_empty(&jl->j_tail_bh_list));
4291         mutex_unlock(&jl->j_commit_mutex);
4292
4293         /*
4294          * honor the flush wishes from the caller, simple commits can
4295          * be done outside the journal lock, they are done below
4296          *
4297          * if we don't flush the commit list right now, we put it into
4298          * the work queue so the people waiting on the async progress work
4299          * queue don't wait for this proc to flush journal lists and such.
4300          */
4301         if (flush) {
4302                 flush_commit_list(sb, jl, 1);
4303                 flush_journal_list(sb, jl, 1);
4304         } else if (!(jl->j_state & LIST_COMMIT_PENDING)) {
4305                 /*
4306                  * Avoid queueing work when sb is being shut down. Transaction
4307                  * will be flushed on journal shutdown.
4308                  */
4309                 if (sb->s_flags & SB_ACTIVE)
4310                         queue_delayed_work(REISERFS_SB(sb)->commit_wq,
4311                                            &journal->j_work, HZ / 10);
4312         }
4313
4314         /*
4315          * if the next transaction has any chance of wrapping, flush
4316          * transactions that might get overwritten.  If any journal lists
4317          * are very old flush them as well.
4318          */
4319 first_jl:
4320         list_for_each_safe(entry, safe, &journal->j_journal_list) {
4321                 temp_jl = JOURNAL_LIST_ENTRY(entry);
4322                 if (journal->j_start <= temp_jl->j_start) {
4323                         if ((journal->j_start + journal->j_trans_max + 1) >=
4324                             temp_jl->j_start) {
4325                                 flush_used_journal_lists(sb, temp_jl);
4326                                 goto first_jl;
4327                         } else if ((journal->j_start +
4328                                     journal->j_trans_max + 1) <
4329                                    SB_ONDISK_JOURNAL_SIZE(sb)) {
4330                                 /*
4331                                  * if we don't cross into the next
4332                                  * transaction and we don't wrap, there is
4333                                  * no way we can overlap any later transactions
4334                                  * break now
4335                                  */
4336                                 break;
4337                         }
4338                 } else if ((journal->j_start +
4339                             journal->j_trans_max + 1) >
4340                            SB_ONDISK_JOURNAL_SIZE(sb)) {
4341                         if (((journal->j_start + journal->j_trans_max + 1) %
4342                              SB_ONDISK_JOURNAL_SIZE(sb)) >=
4343                             temp_jl->j_start) {
4344                                 flush_used_journal_lists(sb, temp_jl);
4345                                 goto first_jl;
4346                         } else {
4347                                 /*
4348                                 * we don't overlap anything from out start
4349                                 * to the end of the log, and our wrapped
4350                                 * portion doesn't overlap anything at
4351                                 * the start of the log.  We can break
4352                                 */
4353                                 break;
4354                         }
4355                 }
4356         }
4357
4358         journal->j_current_jl->j_list_bitmap =
4359             get_list_bitmap(sb, journal->j_current_jl);
4360
4361         if (!(journal->j_current_jl->j_list_bitmap)) {
4362                 reiserfs_panic(sb, "journal-1996",
4363                                "could not get a list bitmap");
4364         }
4365
4366         atomic_set(&journal->j_jlock, 0);
4367         unlock_journal(sb);
4368         /* wake up any body waiting to join. */
4369         clear_bit(J_WRITERS_QUEUED, &journal->j_state);
4370         wake_up(&journal->j_join_wait);
4371
4372         if (!flush && wait_on_commit &&
4373             journal_list_still_alive(sb, commit_trans_id)) {
4374                 flush_commit_list(sb, jl, 1);
4375         }
4376 out:
4377         reiserfs_check_lock_depth(sb, "journal end2");
4378
4379         memset(th, 0, sizeof(*th));
4380         /*
4381          * Re-set th->t_super, so we can properly keep track of how many
4382          * persistent transactions there are. We need to do this so if this
4383          * call is part of a failed restart_transaction, we can free it later
4384          */
4385         th->t_super = sb;
4386
4387         return journal->j_errno;
4388 }
4389
4390 /* Send the file system read only and refuse new transactions */
4391 void reiserfs_abort_journal(struct super_block *sb, int errno)
4392 {
4393         struct reiserfs_journal *journal = SB_JOURNAL(sb);
4394         if (test_bit(J_ABORTED, &journal->j_state))
4395                 return;
4396
4397         if (!journal->j_errno)
4398                 journal->j_errno = errno;
4399
4400         sb->s_flags |= SB_RDONLY;
4401         set_bit(J_ABORTED, &journal->j_state);
4402
4403 #ifdef CONFIG_REISERFS_CHECK
4404         dump_stack();
4405 #endif
4406 }