fs/gfs2/trans.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/sched.h>
  13 #include <linux/slab.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/completion.h>
  16 #include <linux/buffer_head.h>
  17 #include <linux/kallsyms.h>
  18 #include <linux/gfs2_ondisk.h>
  19
  20 #include "gfs2.h"
  21 #include "incore.h"
  22 #include "glock.h"
  23 #include "inode.h"
  24 #include "log.h"
  25 #include "lops.h"
  26 #include "meta_io.h"
  27 #include "trans.h"
  28 #include "util.h"
  29 #include "trace_gfs2.h"
  30
  31 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
  32                      unsigned int revokes)
  33 {
  34         struct gfs2_trans *tr;
  35         int error;
  36
  37         BUG_ON(current->journal_info);
  38         BUG_ON(blocks == 0 && revokes == 0);
  39
  40         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
  41                 return -EROFS;
  42
  43         tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
  44         if (!tr)
  45                 return -ENOMEM;
  46
  47         tr->tr_ip = _RET_IP_;
  48         tr->tr_blocks = blocks;
  49         tr->tr_revokes = revokes;
  50         tr->tr_reserved = 1;
  51         set_bit(TR_ALLOCED, &tr->tr_flags);
  52         if (blocks)
  53                 tr->tr_reserved += 6 + blocks;
  54         if (revokes)
  55                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
  56                                                    sizeof(u64));
  57         INIT_LIST_HEAD(&tr->tr_databuf);
  58         INIT_LIST_HEAD(&tr->tr_buf);
  59         INIT_LIST_HEAD(&tr->tr_ail1_list);
  60         INIT_LIST_HEAD(&tr->tr_ail2_list);
  61
  62         sb_start_intwrite(sdp->sd_vfs);
  63
  64         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  65         if (error)
  66                 goto fail;
  67
  68         current->journal_info = tr;
  69
  70         return 0;
  71
  72 fail:
  73         sb_end_intwrite(sdp->sd_vfs);
  74         kfree(tr);
  75
  76         return error;
  77 }
  78
  79 static void gfs2_print_trans(const struct gfs2_trans *tr)
  80 {
  81         pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip);
  82         pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n",
  83                 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
  84                 test_bit(TR_TOUCHED, &tr->tr_flags));
  85         pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
  86                 tr->tr_num_buf_new, tr->tr_num_buf_rm,
  87                 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
  88                 tr->tr_num_revoke, tr->tr_num_revoke_rm);
  89 }
  90
  91 void gfs2_trans_end(struct gfs2_sbd *sdp)
  92 {
  93         struct gfs2_trans *tr = current->journal_info;
  94         s64 nbuf;
  95         int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
  96
  97         BUG_ON(!tr);
  98         current->journal_info = NULL;
  99
 100         if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
 101                 gfs2_log_release(sdp, tr->tr_reserved);
 102                 if (alloced) {
 103                         kfree(tr);
 104                         sb_end_intwrite(sdp->sd_vfs);
 105                 }
 106                 return;
 107         }
 108
 109         nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
 110         nbuf -= tr->tr_num_buf_rm;
 111         nbuf -= tr->tr_num_databuf_rm;
 112
 113         if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
 114                                        (tr->tr_num_revoke <= tr->tr_revokes)))
 115                 gfs2_print_trans(tr);
 116
 117         gfs2_log_commit(sdp, tr);
 118         if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
 119                 kfree(tr);
 120         up_read(&sdp->sd_log_flush_lock);
 121
 122         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 123                 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
 124         if (alloced)
 125                 sb_end_intwrite(sdp->sd_vfs);
 126 }
 127
 128 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
 129                                                struct buffer_head *bh,
 130                                                const struct gfs2_log_operations *lops)
 131 {
 132         struct gfs2_bufdata *bd;
 133
 134         bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
 135         bd->bd_bh = bh;
 136         bd->bd_gl = gl;
 137         bd->bd_ops = lops;
 138         INIT_LIST_HEAD(&bd->bd_list);
 139         bh->b_private = bd;
 140         return bd;
 141 }
 142
 143 /**
 144  * gfs2_trans_add_data - Add a databuf to the transaction.
 145  * @gl: The inode glock associated with the buffer
 146  * @bh: The buffer to add
 147  *
 148  * This is used in two distinct cases:
 149  * i) In ordered write mode
 150  *    We put the data buffer on a list so that we can ensure that its
 151  *    synced to disk at the right time
 152  * ii) In journaled data mode
 153  *    We need to journal the data block in the same way as metadata in
 154  *    the functions above. The difference is that here we have a tag
 155  *    which is two __be64's being the block number (as per meta data)
 156  *    and a flag which says whether the data block needs escaping or
 157  *    not. This means we need a new log entry for each 251 or so data
 158  *    blocks, which isn't an enormous overhead but twice as much as
 159  *    for normal metadata blocks.
 160  */
 161 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
 162 {
 163         struct gfs2_trans *tr = current->journal_info;
 164         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 165         struct address_space *mapping = bh->b_page->mapping;
 166         struct gfs2_inode *ip = GFS2_I(mapping->host);
 167         struct gfs2_bufdata *bd;
 168
 169         if (!gfs2_is_jdata(ip)) {
 170                 gfs2_ordered_add_inode(ip);
 171                 return;
 172         }
 173
 174         lock_buffer(bh);
 175         if (buffer_pinned(bh)) {
 176                 set_bit(TR_TOUCHED, &tr->tr_flags);
 177                 goto out;
 178         }
 179         gfs2_log_lock(sdp);
 180         bd = bh->b_private;
 181         if (bd == NULL) {
 182                 gfs2_log_unlock(sdp);
 183                 unlock_buffer(bh);
 184                 if (bh->b_private == NULL)
 185                         bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops);
 186                 else
 187                         bd = bh->b_private;
 188                 lock_buffer(bh);
 189                 gfs2_log_lock(sdp);
 190         }
 191         gfs2_assert(sdp, bd->bd_gl == gl);
 192         set_bit(TR_TOUCHED, &tr->tr_flags);
 193         if (list_empty(&bd->bd_list)) {
 194                 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 195                 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 196                 gfs2_pin(sdp, bd->bd_bh);
 197                 tr->tr_num_databuf_new++;
 198                 list_add_tail(&bd->bd_list, &tr->tr_databuf);
 199         }
 200         gfs2_log_unlock(sdp);
 201 out:
 202         unlock_buffer(bh);
 203 }
 204
 205 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 206 {
 207
 208         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 209         struct gfs2_bufdata *bd;
 210         struct gfs2_meta_header *mh;
 211         struct gfs2_trans *tr = current->journal_info;
 212         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 213
 214         lock_buffer(bh);
 215         if (buffer_pinned(bh)) {
 216                 set_bit(TR_TOUCHED, &tr->tr_flags);
 217                 goto out;
 218         }
 219         gfs2_log_lock(sdp);
 220         bd = bh->b_private;
 221         if (bd == NULL) {
 222                 gfs2_log_unlock(sdp);
 223                 unlock_buffer(bh);
 224                 lock_page(bh->b_page);
 225                 if (bh->b_private == NULL)
 226                         bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops);
 227                 else
 228                         bd = bh->b_private;
 229                 unlock_page(bh->b_page);
 230                 lock_buffer(bh);
 231                 gfs2_log_lock(sdp);
 232         }
 233         gfs2_assert(sdp, bd->bd_gl == gl);
 234         set_bit(TR_TOUCHED, &tr->tr_flags);
 235         if (!list_empty(&bd->bd_list))
 236                 goto out_unlock;
 237         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 238         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 239         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
 240         if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
 241                 pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n",
 242                        (unsigned long long)bd->bd_bh->b_blocknr);
 243                 BUG();
 244         }
 245         if (unlikely(state == SFS_FROZEN)) {
 246                 printk(KERN_INFO "GFS2:adding buf while frozen\n");
 247                 gfs2_assert_withdraw(sdp, 0);
 248         }
 249         gfs2_pin(sdp, bd->bd_bh);
 250         mh->__pad0 = cpu_to_be64(0);
 251         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 252         list_add(&bd->bd_list, &tr->tr_buf);
 253         tr->tr_num_buf_new++;
 254 out_unlock:
 255         gfs2_log_unlock(sdp);
 256 out:
 257         unlock_buffer(bh);
 258 }
 259
 260 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 261 {
 262         struct gfs2_trans *tr = current->journal_info;
 263
 264         BUG_ON(!list_empty(&bd->bd_list));
 265         gfs2_add_revoke(sdp, bd);
 266         set_bit(TR_TOUCHED, &tr->tr_flags);
 267         tr->tr_num_revoke++;
 268 }
 269
 270 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
 271 {
 272         struct gfs2_bufdata *bd, *tmp;
 273         struct gfs2_trans *tr = current->journal_info;
 274         unsigned int n = len;
 275
 276         gfs2_log_lock(sdp);
 277         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) {
 278                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
 279                         list_del_init(&bd->bd_list);
 280                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 281                         sdp->sd_log_num_revoke--;
 282                         if (bd->bd_gl)
 283                                 gfs2_glock_remove_revoke(bd->bd_gl);
 284                         kmem_cache_free(gfs2_bufdata_cachep, bd);
 285                         tr->tr_num_revoke_rm++;
 286                         if (--n == 0)
 287                                 break;
 288                 }
 289         }
 290         gfs2_log_unlock(sdp);
 291 }
 292