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