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 static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
  29 {
  30         fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
  31         fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
  32                 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
  33                 test_bit(TR_TOUCHED, &tr->tr_flags));
  34         fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
  35                 tr->tr_num_buf_new, tr->tr_num_buf_rm,
  36                 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
  37                 tr->tr_num_revoke, tr->tr_num_revoke_rm);
  38 }
  39
  40 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
  41                      unsigned int revokes)
  42 {
  43         struct gfs2_trans *tr;
  44         int error;
  45
  46         if (current->journal_info) {
  47                 gfs2_print_trans(sdp, current->journal_info);
  48                 BUG();
  49         }
  50         BUG_ON(blocks == 0 && revokes == 0);
  51
  52         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
  53                 return -EROFS;
  54
  55         tr = kmem_cache_zalloc(gfs2_trans_cachep, GFP_NOFS);
  56         if (!tr)
  57                 return -ENOMEM;
  58
  59         tr->tr_ip = _RET_IP_;
  60         tr->tr_blocks = blocks;
  61         tr->tr_revokes = revokes;
  62         tr->tr_reserved = 1;
  63         set_bit(TR_ALLOCED, &tr->tr_flags);
  64         if (blocks)
  65                 tr->tr_reserved += 6 + blocks;
  66         if (revokes)
  67                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes);
  68         INIT_LIST_HEAD(&tr->tr_databuf);
  69         INIT_LIST_HEAD(&tr->tr_buf);
  70         INIT_LIST_HEAD(&tr->tr_list);
  71         INIT_LIST_HEAD(&tr->tr_ail1_list);
  72         INIT_LIST_HEAD(&tr->tr_ail2_list);
  73
  74         sb_start_intwrite(sdp->sd_vfs);
  75
  76         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  77         if (error)
  78                 goto fail;
  79
  80         current->journal_info = tr;
  81
  82         return 0;
  83
  84 fail:
  85         sb_end_intwrite(sdp->sd_vfs);
  86         kmem_cache_free(gfs2_trans_cachep, tr);
  87
  88         return error;
  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         current->journal_info = NULL;
  98
  99         if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
 100                 gfs2_log_release(sdp, tr->tr_reserved);
 101                 if (alloced) {
 102                         gfs2_trans_free(sdp, tr);
 103                         sb_end_intwrite(sdp->sd_vfs);
 104                 }
 105                 return;
 106         }
 107
 108         nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
 109         nbuf -= tr->tr_num_buf_rm;
 110         nbuf -= tr->tr_num_databuf_rm;
 111
 112         if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
 113                                        (tr->tr_num_revoke <= tr->tr_revokes)))
 114                 gfs2_print_trans(sdp, tr);
 115
 116         gfs2_log_commit(sdp, tr);
 117         if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
 118                 gfs2_trans_free(sdp, tr);
 119         up_read(&sdp->sd_log_flush_lock);
 120
 121         if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
 122                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 123                                GFS2_LFC_TRANS_END);
 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 {
 131         struct gfs2_bufdata *bd;
 132
 133         bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
 134         bd->bd_bh = bh;
 135         bd->bd_gl = gl;
 136         INIT_LIST_HEAD(&bd->bd_list);
 137         bh->b_private = bd;
 138         return bd;
 139 }
 140
 141 /**
 142  * gfs2_trans_add_data - Add a databuf to the transaction.
 143  * @gl: The inode glock associated with the buffer
 144  * @bh: The buffer to add
 145  *
 146  * This is used in journaled data mode.
 147  * We need to journal the data block in the same way as metadata in
 148  * the functions above. The difference is that here we have a tag
 149  * which is two __be64's being the block number (as per meta data)
 150  * and a flag which says whether the data block needs escaping or
 151  * not. This means we need a new log entry for each 251 or so data
 152  * blocks, which isn't an enormous overhead but twice as much as
 153  * for normal metadata blocks.
 154  */
 155 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
 156 {
 157         struct gfs2_trans *tr = current->journal_info;
 158         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 159         struct gfs2_bufdata *bd;
 160
 161         lock_buffer(bh);
 162         if (buffer_pinned(bh)) {
 163                 set_bit(TR_TOUCHED, &tr->tr_flags);
 164                 goto out;
 165         }
 166         gfs2_log_lock(sdp);
 167         bd = bh->b_private;
 168         if (bd == NULL) {
 169                 gfs2_log_unlock(sdp);
 170                 unlock_buffer(bh);
 171                 if (bh->b_private == NULL)
 172                         bd = gfs2_alloc_bufdata(gl, bh);
 173                 else
 174                         bd = bh->b_private;
 175                 lock_buffer(bh);
 176                 gfs2_log_lock(sdp);
 177         }
 178         gfs2_assert(sdp, bd->bd_gl == gl);
 179         set_bit(TR_TOUCHED, &tr->tr_flags);
 180         if (list_empty(&bd->bd_list)) {
 181                 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 182                 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 183                 gfs2_pin(sdp, bd->bd_bh);
 184                 tr->tr_num_databuf_new++;
 185                 list_add_tail(&bd->bd_list, &tr->tr_databuf);
 186         }
 187         gfs2_log_unlock(sdp);
 188 out:
 189         unlock_buffer(bh);
 190 }
 191
 192 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 193 {
 194
 195         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 196         struct gfs2_bufdata *bd;
 197         struct gfs2_meta_header *mh;
 198         struct gfs2_trans *tr = current->journal_info;
 199         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 200
 201         lock_buffer(bh);
 202         if (buffer_pinned(bh)) {
 203                 set_bit(TR_TOUCHED, &tr->tr_flags);
 204                 goto out;
 205         }
 206         gfs2_log_lock(sdp);
 207         bd = bh->b_private;
 208         if (bd == NULL) {
 209                 gfs2_log_unlock(sdp);
 210                 unlock_buffer(bh);
 211                 lock_page(bh->b_page);
 212                 if (bh->b_private == NULL)
 213                         bd = gfs2_alloc_bufdata(gl, bh);
 214                 else
 215                         bd = bh->b_private;
 216                 unlock_page(bh->b_page);
 217                 lock_buffer(bh);
 218                 gfs2_log_lock(sdp);
 219         }
 220         gfs2_assert(sdp, bd->bd_gl == gl);
 221         set_bit(TR_TOUCHED, &tr->tr_flags);
 222         if (!list_empty(&bd->bd_list))
 223                 goto out_unlock;
 224         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 225         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 226         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
 227         if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
 228                 fs_err(sdp, "Attempting to add uninitialised block to "
 229                        "journal (inplace block=%lld)\n",
 230                        (unsigned long long)bd->bd_bh->b_blocknr);
 231                 BUG();
 232         }
 233         if (unlikely(state == SFS_FROZEN)) {
 234                 fs_info(sdp, "GFS2:adding buf while frozen\n");
 235                 gfs2_assert_withdraw(sdp, 0);
 236         }
 237         if (unlikely(gfs2_withdrawn(sdp))) {
 238                 fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n",
 239                         (unsigned long long)bd->bd_bh->b_blocknr);
 240         }
 241         gfs2_pin(sdp, bd->bd_bh);
 242         mh->__pad0 = cpu_to_be64(0);
 243         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 244         list_add(&bd->bd_list, &tr->tr_buf);
 245         tr->tr_num_buf_new++;
 246 out_unlock:
 247         gfs2_log_unlock(sdp);
 248 out:
 249         unlock_buffer(bh);
 250 }
 251
 252 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 253 {
 254         struct gfs2_trans *tr = current->journal_info;
 255
 256         BUG_ON(!list_empty(&bd->bd_list));
 257         gfs2_add_revoke(sdp, bd);
 258         set_bit(TR_TOUCHED, &tr->tr_flags);
 259         tr->tr_num_revoke++;
 260 }
 261
 262 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
 263 {
 264         struct gfs2_bufdata *bd, *tmp;
 265         struct gfs2_trans *tr = current->journal_info;
 266         unsigned int n = len;
 267
 268         gfs2_log_lock(sdp);
 269         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) {
 270                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
 271                         list_del_init(&bd->bd_list);
 272                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 273                         sdp->sd_log_num_revoke--;
 274                         if (bd->bd_gl)
 275                                 gfs2_glock_remove_revoke(bd->bd_gl);
 276                         kmem_cache_free(gfs2_bufdata_cachep, bd);
 277                         tr->tr_num_revoke_rm++;
 278                         if (--n == 0)
 279                                 break;
 280                 }
 281         }
 282         gfs2_log_unlock(sdp);
 283 }
 284
 285 void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 286 {
 287         if (tr == NULL)
 288                 return;
 289
 290         gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
 291         gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list));
 292         gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf));
 293         gfs2_assert_warn(sdp, list_empty(&tr->tr_buf));
 294         kmem_cache_free(gfs2_trans_cachep, tr);
 295 }