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 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/gfs2_ondisk.h>
  16 #include <linux/kallsyms.h>
  17 #include <linux/lm_interface.h>
  18
  19 #include "gfs2.h"
  20 #include "incore.h"
  21 #include "glock.h"
  22 #include "log.h"
  23 #include "lops.h"
  24 #include "meta_io.h"
  25 #include "trans.h"
  26 #include "util.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         tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
  38         if (!tr)
  39                 return -ENOMEM;
  40
  41         tr->tr_ip = (unsigned long)__builtin_return_address(0);
  42         tr->tr_blocks = blocks;
  43         tr->tr_revokes = revokes;
  44         tr->tr_reserved = 1;
  45         if (blocks)
  46                 tr->tr_reserved += 6 + blocks;
  47         if (revokes)
  48                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
  49                                                    sizeof(u64));
  50         INIT_LIST_HEAD(&tr->tr_list_buf);
  51
  52         gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
  53
  54         error = gfs2_glock_nq(&tr->tr_t_gh);
  55         if (error)
  56                 goto fail_holder_uninit;
  57
  58         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
  59                 tr->tr_t_gh.gh_flags |= GL_NOCACHE;
  60                 error = -EROFS;
  61                 goto fail_gunlock;
  62         }
  63
  64         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  65         if (error)
  66                 goto fail_gunlock;
  67
  68         current->journal_info = tr;
  69
  70         return 0;
  71
  72 fail_gunlock:
  73         gfs2_glock_dq(&tr->tr_t_gh);
  74
  75 fail_holder_uninit:
  76         gfs2_holder_uninit(&tr->tr_t_gh);
  77         kfree(tr);
  78
  79         return error;
  80 }
  81
  82 void gfs2_trans_end(struct gfs2_sbd *sdp)
  83 {
  84         struct gfs2_trans *tr = current->journal_info;
  85
  86         BUG_ON(!tr);
  87         current->journal_info = NULL;
  88
  89         if (!tr->tr_touched) {
  90                 gfs2_log_release(sdp, tr->tr_reserved);
  91                 gfs2_glock_dq(&tr->tr_t_gh);
  92                 gfs2_holder_uninit(&tr->tr_t_gh);
  93                 kfree(tr);
  94                 return;
  95         }
  96
  97         if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
  98                 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
  99                        tr->tr_num_buf, tr->tr_blocks);
 100                 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
 101         }
 102         if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
 103                 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
 104                        tr->tr_num_revoke, tr->tr_revokes);
 105                 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
 106         }
 107
 108         gfs2_log_commit(sdp, tr);
 109         gfs2_glock_dq(&tr->tr_t_gh);
 110         gfs2_holder_uninit(&tr->tr_t_gh);
 111         kfree(tr);
 112
 113         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 114                 gfs2_log_flush(sdp, NULL);
 115 }
 116
 117 /**
 118  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 119  * @gl: the glock the buffer belongs to
 120  * @bh: The buffer to add
 121  * @meta: True in the case of adding metadata
 122  *
 123  */
 124
 125 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 126 {
 127         struct gfs2_sbd *sdp = gl->gl_sbd;
 128         struct gfs2_bufdata *bd;
 129
 130         bd = bh->b_private;
 131         if (bd)
 132                 gfs2_assert(sdp, bd->bd_gl == gl);
 133         else {
 134                 gfs2_attach_bufdata(gl, bh, meta);
 135                 bd = bh->b_private;
 136         }
 137         lops_add(sdp, &bd->bd_le);
 138 }
 139
 140 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 141 {
 142         BUG_ON(!list_empty(&bd->bd_le.le_list));
 143         BUG_ON(!list_empty(&bd->bd_ail_st_list));
 144         BUG_ON(!list_empty(&bd->bd_ail_gl_list));
 145         lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
 146         lops_add(sdp, &bd->bd_le);
 147 }
 148
 149 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
 150 {
 151         struct gfs2_bufdata *bd, *tmp;
 152         struct gfs2_trans *tr = current->journal_info;
 153         unsigned int n = len;
 154
 155         gfs2_log_lock(sdp);
 156         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) {
 157                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
 158                         list_del_init(&bd->bd_le.le_list);
 159                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 160                         sdp->sd_log_num_revoke--;
 161                         kmem_cache_free(gfs2_bufdata_cachep, bd);
 162                         tr->tr_num_revoke_rm++;
 163                         if (--n == 0)
 164                                 break;
 165                 }
 166         }
 167         gfs2_log_unlock(sdp);
 168 }
 169
 170 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 171 {
 172         lops_add(rgd->rd_sbd, &rgd->rd_le);
 173 }
 174