fs/gfs2/trans.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   5  */
   6
   7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   8
   9 #include <linux/sched.h>
  10 #include <linux/slab.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/completion.h>
  13 #include <linux/buffer_head.h>
  14 #include <linux/kallsyms.h>
  15 #include <linux/gfs2_ondisk.h>
  16
  17 #include "gfs2.h"
  18 #include "incore.h"
  19 #include "glock.h"
  20 #include "inode.h"
  21 #include "log.h"
  22 #include "lops.h"
  23 #include "meta_io.h"
  24 #include "trans.h"
  25 #include "util.h"
  26 #include "trace_gfs2.h"
  27
  28 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
  29                      unsigned int revokes)
  30 {
  31         struct gfs2_trans *tr;
  32         int error;
  33
  34         BUG_ON(current->journal_info);
  35         BUG_ON(blocks == 0 && revokes == 0);
  36
  37         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
  38                 return -EROFS;
  39
  40         tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
  41         if (!tr)
  42                 return -ENOMEM;
  43
  44         tr->tr_ip = _RET_IP_;
  45         tr->tr_blocks = blocks;
  46         tr->tr_revokes = revokes;
  47         tr->tr_reserved = 1;
  48         set_bit(TR_ALLOCED, &tr->tr_flags);
  49         if (blocks)
  50                 tr->tr_reserved += 6 + blocks;
  51         if (revokes)
  52                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
  53                                                    sizeof(u64));
  54         INIT_LIST_HEAD(&tr->tr_databuf);
  55         INIT_LIST_HEAD(&tr->tr_buf);
  56         INIT_LIST_HEAD(&tr->tr_ail1_list);
  57         INIT_LIST_HEAD(&tr->tr_ail2_list);
  58
  59         sb_start_intwrite(sdp->sd_vfs);
  60
  61         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  62         if (error)
  63                 goto fail;
  64
  65         current->journal_info = tr;
  66
  67         return 0;
  68
  69 fail:
  70         sb_end_intwrite(sdp->sd_vfs);
  71         kfree(tr);
  72
  73         return error;
  74 }
  75
  76 static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
  77 {
  78         fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
  79         fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
  80                 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
  81                 test_bit(TR_TOUCHED, &tr->tr_flags));
  82         fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u\n",
  83                 tr->tr_num_buf_new, tr->tr_num_buf_rm,
  84                 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
  85                 tr->tr_num_revoke);
  86 }
  87
  88 void gfs2_trans_end(struct gfs2_sbd *sdp)
  89 {
  90         struct gfs2_trans *tr = current->journal_info;
  91         s64 nbuf;
  92         int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
  93
  94         current->journal_info = NULL;
  95
  96         if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
  97                 gfs2_log_release(sdp, tr->tr_reserved);
  98                 if (alloced) {
  99                         kfree(tr);
 100                         sb_end_intwrite(sdp->sd_vfs);
 101                 }
 102                 return;
 103         }
 104
 105         nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
 106         nbuf -= tr->tr_num_buf_rm;
 107         nbuf -= tr->tr_num_databuf_rm;
 108
 109         if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
 110                                        (tr->tr_num_revoke <= tr->tr_revokes)))
 111                 gfs2_print_trans(sdp, tr);
 112
 113         gfs2_log_commit(sdp, tr);
 114         if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
 115                 kfree(tr);
 116         up_read(&sdp->sd_log_flush_lock);
 117
 118         if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
 119                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 120                                GFS2_LFC_TRANS_END);
 121         if (alloced)
 122                 sb_end_intwrite(sdp->sd_vfs);
 123 }
 124
 125 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
 126                                                struct buffer_head *bh)
 127 {
 128         struct gfs2_bufdata *bd;
 129
 130         bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
 131         bd->bd_bh = bh;
 132         bd->bd_gl = gl;
 133         INIT_LIST_HEAD(&bd->bd_list);
 134         bh->b_private = bd;
 135         return bd;
 136 }
 137
 138 /**
 139  * gfs2_trans_add_data - Add a databuf to the transaction.
 140  * @gl: The inode glock associated with the buffer
 141  * @bh: The buffer to add
 142  *
 143  * This is used in journaled data mode.
 144  * We need to journal the data block in the same way as metadata in
 145  * the functions above. The difference is that here we have a tag
 146  * which is two __be64's being the block number (as per meta data)
 147  * and a flag which says whether the data block needs escaping or
 148  * not. This means we need a new log entry for each 251 or so data
 149  * blocks, which isn't an enormous overhead but twice as much as
 150  * for normal metadata blocks.
 151  */
 152 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
 153 {
 154         struct gfs2_trans *tr = current->journal_info;
 155         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 156         struct gfs2_bufdata *bd;
 157
 158         lock_buffer(bh);
 159         if (buffer_pinned(bh)) {
 160                 set_bit(TR_TOUCHED, &tr->tr_flags);
 161                 goto out;
 162         }
 163         gfs2_log_lock(sdp);
 164         bd = bh->b_private;
 165         if (bd == NULL) {
 166                 gfs2_log_unlock(sdp);
 167                 unlock_buffer(bh);
 168                 if (bh->b_private == NULL)
 169                         bd = gfs2_alloc_bufdata(gl, bh);
 170                 else
 171                         bd = bh->b_private;
 172                 lock_buffer(bh);
 173                 gfs2_log_lock(sdp);
 174         }
 175         gfs2_assert(sdp, bd->bd_gl == gl);
 176         set_bit(TR_TOUCHED, &tr->tr_flags);
 177         if (list_empty(&bd->bd_list)) {
 178                 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 179                 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 180                 gfs2_pin(sdp, bd->bd_bh);
 181                 tr->tr_num_databuf_new++;
 182                 list_add_tail(&bd->bd_list, &tr->tr_databuf);
 183         }
 184         gfs2_log_unlock(sdp);
 185 out:
 186         unlock_buffer(bh);
 187 }
 188
 189 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 190 {
 191
 192         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 193         struct gfs2_bufdata *bd;
 194         struct gfs2_meta_header *mh;
 195         struct gfs2_trans *tr = current->journal_info;
 196         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 197
 198         lock_buffer(bh);
 199         if (buffer_pinned(bh)) {
 200                 set_bit(TR_TOUCHED, &tr->tr_flags);
 201                 goto out;
 202         }
 203         gfs2_log_lock(sdp);
 204         bd = bh->b_private;
 205         if (bd == NULL) {
 206                 gfs2_log_unlock(sdp);
 207                 unlock_buffer(bh);
 208                 lock_page(bh->b_page);
 209                 if (bh->b_private == NULL)
 210                         bd = gfs2_alloc_bufdata(gl, bh);
 211                 else
 212                         bd = bh->b_private;
 213                 unlock_page(bh->b_page);
 214                 lock_buffer(bh);
 215                 gfs2_log_lock(sdp);
 216         }
 217         gfs2_assert(sdp, bd->bd_gl == gl);
 218         set_bit(TR_TOUCHED, &tr->tr_flags);
 219         if (!list_empty(&bd->bd_list))
 220                 goto out_unlock;
 221         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 222         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 223         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
 224         if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
 225                 fs_err(sdp, "Attempting to add uninitialised block to "
 226                        "journal (inplace block=%lld)\n",
 227                        (unsigned long long)bd->bd_bh->b_blocknr);
 228                 BUG();
 229         }
 230         if (unlikely(state == SFS_FROZEN)) {
 231                 fs_info(sdp, "GFS2:adding buf while frozen\n");
 232                 gfs2_assert_withdraw(sdp, 0);
 233         }
 234         gfs2_pin(sdp, bd->bd_bh);
 235         mh->__pad0 = cpu_to_be64(0);
 236         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 237         list_add(&bd->bd_list, &tr->tr_buf);
 238         tr->tr_num_buf_new++;
 239 out_unlock:
 240         gfs2_log_unlock(sdp);
 241 out:
 242         unlock_buffer(bh);
 243 }
 244
 245 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 246 {
 247         struct gfs2_trans *tr = current->journal_info;
 248
 249         BUG_ON(!list_empty(&bd->bd_list));
 250         gfs2_add_revoke(sdp, bd);
 251         set_bit(TR_TOUCHED, &tr->tr_flags);
 252         tr->tr_num_revoke++;
 253 }
 254
 255 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
 256 {
 257         struct gfs2_bufdata *bd, *tmp;
 258         struct gfs2_trans *tr = current->journal_info;
 259         unsigned int n = len;
 260
 261         gfs2_log_lock(sdp);
 262         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) {
 263                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
 264                         list_del_init(&bd->bd_list);
 265                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 266                         sdp->sd_log_num_revoke--;
 267                         if (bd->bd_gl)
 268                                 gfs2_glock_remove_revoke(bd->bd_gl);
 269                         kmem_cache_free(gfs2_bufdata_cachep, bd);
 270                         tr->tr_num_revoke--;
 271                         if (--n == 0)
 272                                 break;
 273                 }
 274         }
 275         gfs2_log_unlock(sdp);
 276 }
 277