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