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 = kmem_cache_zalloc(gfs2_trans_cachep, 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         INIT_LIST_HEAD(&tr->tr_ail1_list);
  56         INIT_LIST_HEAD(&tr->tr_ail2_list);
  57
  58         sb_start_intwrite(sdp->sd_vfs);
  59
  60         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  61         if (error)
  62                 goto fail;
  63
  64         current->journal_info = tr;
  65
  66         return 0;
  67
  68 fail:
  69         sb_end_intwrite(sdp->sd_vfs);
  70         kmem_cache_free(gfs2_trans_cachep, tr);
  71
  72         return error;
  73 }
  74
  75 static void gfs2_print_trans(struct gfs2_sbd *sdp, const struct gfs2_trans *tr)
  76 {
  77         fs_warn(sdp, "Transaction created at: %pSR\n", (void *)tr->tr_ip);
  78         fs_warn(sdp, "blocks=%u revokes=%u reserved=%u touched=%u\n",
  79                 tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
  80                 test_bit(TR_TOUCHED, &tr->tr_flags));
  81         fs_warn(sdp, "Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
  82                 tr->tr_num_buf_new, tr->tr_num_buf_rm,
  83                 tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
  84                 tr->tr_num_revoke, tr->tr_num_revoke_rm);
  85 }
  86
  87 void gfs2_trans_end(struct gfs2_sbd *sdp)
  88 {
  89         struct gfs2_trans *tr = current->journal_info;
  90         s64 nbuf;
  91         int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
  92
  93         current->journal_info = NULL;
  94
  95         if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
  96                 gfs2_log_release(sdp, tr->tr_reserved);
  97                 if (alloced) {
  98                         gfs2_trans_free(sdp, tr);
  99                         sb_end_intwrite(sdp->sd_vfs);
 100                 }
 101                 return;
 102         }
 103
 104         nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new;
 105         nbuf -= tr->tr_num_buf_rm;
 106         nbuf -= tr->tr_num_databuf_rm;
 107
 108         if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) &&
 109                                        (tr->tr_num_revoke <= tr->tr_revokes)))
 110                 gfs2_print_trans(sdp, tr);
 111
 112         gfs2_log_commit(sdp, tr);
 113         if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
 114                 gfs2_trans_free(sdp, tr);
 115         up_read(&sdp->sd_log_flush_lock);
 116
 117         if (sdp->sd_vfs->s_flags & SB_SYNCHRONOUS)
 118                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
 119                                GFS2_LFC_TRANS_END);
 120         if (alloced)
 121                 sb_end_intwrite(sdp->sd_vfs);
 122 }
 123
 124 static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl,
 125                                                struct buffer_head *bh)
 126 {
 127         struct gfs2_bufdata *bd;
 128
 129         bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL);
 130         bd->bd_bh = bh;
 131         bd->bd_gl = gl;
 132         INIT_LIST_HEAD(&bd->bd_list);
 133         bh->b_private = bd;
 134         return bd;
 135 }
 136
 137 /**
 138  * gfs2_trans_add_data - Add a databuf to the transaction.
 139  * @gl: The inode glock associated with the buffer
 140  * @bh: The buffer to add
 141  *
 142  * This is used in journaled data mode.
 143  * We need to journal the data block in the same way as metadata in
 144  * the functions above. The difference is that here we have a tag
 145  * which is two __be64's being the block number (as per meta data)
 146  * and a flag which says whether the data block needs escaping or
 147  * not. This means we need a new log entry for each 251 or so data
 148  * blocks, which isn't an enormous overhead but twice as much as
 149  * for normal metadata blocks.
 150  */
 151 void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
 152 {
 153         struct gfs2_trans *tr = current->journal_info;
 154         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 155         struct gfs2_bufdata *bd;
 156
 157         lock_buffer(bh);
 158         if (buffer_pinned(bh)) {
 159                 set_bit(TR_TOUCHED, &tr->tr_flags);
 160                 goto out;
 161         }
 162         gfs2_log_lock(sdp);
 163         bd = bh->b_private;
 164         if (bd == NULL) {
 165                 gfs2_log_unlock(sdp);
 166                 unlock_buffer(bh);
 167                 if (bh->b_private == NULL)
 168                         bd = gfs2_alloc_bufdata(gl, bh);
 169                 else
 170                         bd = bh->b_private;
 171                 lock_buffer(bh);
 172                 gfs2_log_lock(sdp);
 173         }
 174         gfs2_assert(sdp, bd->bd_gl == gl);
 175         set_bit(TR_TOUCHED, &tr->tr_flags);
 176         if (list_empty(&bd->bd_list)) {
 177                 set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 178                 set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 179                 gfs2_pin(sdp, bd->bd_bh);
 180                 tr->tr_num_databuf_new++;
 181                 list_add_tail(&bd->bd_list, &tr->tr_databuf);
 182         }
 183         gfs2_log_unlock(sdp);
 184 out:
 185         unlock_buffer(bh);
 186 }
 187
 188 void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
 189 {
 190
 191         struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
 192         struct gfs2_bufdata *bd;
 193         struct gfs2_meta_header *mh;
 194         struct gfs2_trans *tr = current->journal_info;
 195         enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
 196
 197         lock_buffer(bh);
 198         if (buffer_pinned(bh)) {
 199                 set_bit(TR_TOUCHED, &tr->tr_flags);
 200                 goto out;
 201         }
 202         gfs2_log_lock(sdp);
 203         bd = bh->b_private;
 204         if (bd == NULL) {
 205                 gfs2_log_unlock(sdp);
 206                 unlock_buffer(bh);
 207                 lock_page(bh->b_page);
 208                 if (bh->b_private == NULL)
 209                         bd = gfs2_alloc_bufdata(gl, bh);
 210                 else
 211                         bd = bh->b_private;
 212                 unlock_page(bh->b_page);
 213                 lock_buffer(bh);
 214                 gfs2_log_lock(sdp);
 215         }
 216         gfs2_assert(sdp, bd->bd_gl == gl);
 217         set_bit(TR_TOUCHED, &tr->tr_flags);
 218         if (!list_empty(&bd->bd_list))
 219                 goto out_unlock;
 220         set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
 221         set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
 222         mh = (struct gfs2_meta_header *)bd->bd_bh->b_data;
 223         if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) {
 224                 fs_err(sdp, "Attempting to add uninitialised block to "
 225                        "journal (inplace block=%lld)\n",
 226                        (unsigned long long)bd->bd_bh->b_blocknr);
 227                 BUG();
 228         }
 229         if (unlikely(state == SFS_FROZEN)) {
 230                 fs_info(sdp, "GFS2:adding buf while frozen\n");
 231                 gfs2_assert_withdraw(sdp, 0);
 232         }
 233         if (unlikely(gfs2_withdrawn(sdp))) {
 234                 fs_info(sdp, "GFS2:adding buf while withdrawn! 0x%llx\n",
 235                         (unsigned long long)bd->bd_bh->b_blocknr);
 236         }
 237         gfs2_pin(sdp, bd->bd_bh);
 238         mh->__pad0 = cpu_to_be64(0);
 239         mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid);
 240         list_add(&bd->bd_list, &tr->tr_buf);
 241         tr->tr_num_buf_new++;
 242 out_unlock:
 243         gfs2_log_unlock(sdp);
 244 out:
 245         unlock_buffer(bh);
 246 }
 247
 248 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 249 {
 250         struct gfs2_trans *tr = current->journal_info;
 251
 252         BUG_ON(!list_empty(&bd->bd_list));
 253         gfs2_add_revoke(sdp, bd);
 254         set_bit(TR_TOUCHED, &tr->tr_flags);
 255         tr->tr_num_revoke++;
 256 }
 257
 258 void gfs2_trans_remove_revoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
 259 {
 260         struct gfs2_bufdata *bd, *tmp;
 261         struct gfs2_trans *tr = current->journal_info;
 262         unsigned int n = len;
 263
 264         gfs2_log_lock(sdp);
 265         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_revokes, bd_list) {
 266                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
 267                         list_del_init(&bd->bd_list);
 268                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 269                         sdp->sd_log_num_revoke--;
 270                         if (bd->bd_gl)
 271                                 gfs2_glock_remove_revoke(bd->bd_gl);
 272                         kmem_cache_free(gfs2_bufdata_cachep, bd);
 273                         tr->tr_num_revoke_rm++;
 274                         if (--n == 0)
 275                                 break;
 276                 }
 277         }
 278         gfs2_log_unlock(sdp);
 279 }
 280
 281 void gfs2_trans_free(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
 282 {
 283         if (tr == NULL)
 284                 return;
 285
 286         gfs2_assert_warn(sdp, list_empty(&tr->tr_ail1_list));
 287         gfs2_assert_warn(sdp, list_empty(&tr->tr_ail2_list));
 288         gfs2_assert_warn(sdp, list_empty(&tr->tr_databuf));
 289         gfs2_assert_warn(sdp, list_empty(&tr->tr_buf));
 290         kmem_cache_free(gfs2_trans_cachep, tr);
 291 }