Pileus Git - ~andy/linux/blob - fs/gfs2/trans.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 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 v.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 <asm/semaphore.h>
  17
  18 #include "gfs2.h"
  19 #include "lm_interface.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_i(struct gfs2_sbd *sdp, unsigned int blocks,
  29                        unsigned int revokes, char *file, unsigned int line)
  30 {
  31         struct gfs2_trans *tr;
  32         int error;
  33
  34         if (gfs2_assert_warn(sdp, !current->journal_info) ||
  35             gfs2_assert_warn(sdp, blocks || revokes)) {
  36                 fs_warn(sdp, "(%s, %u)\n", file, line);
  37                 return -EINVAL;
  38         }
  39
  40         tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
  41         if (!tr)
  42                 return -ENOMEM;
  43
  44         tr->tr_file = file;
  45         tr->tr_line = line;
  46         tr->tr_blocks = blocks;
  47         tr->tr_revokes = revokes;
  48         tr->tr_reserved = 1;
  49         if (blocks)
  50                 tr->tr_reserved += 1 + blocks;
  51         if (revokes)
  52                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
  53                                                    sizeof(uint64_t));
  54         INIT_LIST_HEAD(&tr->tr_list_buf);
  55
  56         gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED,
  57                          GL_NEVER_RECURSE, &tr->tr_t_gh);
  58
  59         error = gfs2_glock_nq(&tr->tr_t_gh);
  60         if (error)
  61                 goto fail_holder_uninit;
  62
  63         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
  64                 tr->tr_t_gh.gh_flags |= GL_NOCACHE;
  65                 error = -EROFS;
  66                 goto fail_gunlock;
  67         }
  68
  69         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  70         if (error)
  71                 goto fail_gunlock;
  72
  73         current->journal_info = tr;
  74
  75         return 0;
  76
  77  fail_gunlock:
  78         gfs2_glock_dq(&tr->tr_t_gh);
  79
  80  fail_holder_uninit:
  81         gfs2_holder_uninit(&tr->tr_t_gh);
  82         kfree(tr);
  83
  84         return error;
  85 }
  86
  87 void gfs2_trans_end(struct gfs2_sbd *sdp)
  88 {
  89         struct gfs2_trans *tr;
  90
  91         tr = current->journal_info;
  92         current->journal_info = NULL;
  93
  94         if (gfs2_assert_warn(sdp, tr))
  95                 return;
  96
  97         if (!tr->tr_touched) {
  98                 gfs2_log_release(sdp, tr->tr_reserved);
  99
 100                 gfs2_glock_dq(&tr->tr_t_gh);
 101                 gfs2_holder_uninit(&tr->tr_t_gh);
 102
 103                 kfree(tr);
 104                 return;
 105         }
 106
 107         if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
 108                 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
 109                        "tr_file = %s, tr_line = %u\n",
 110                        tr->tr_num_buf, tr->tr_blocks,
 111                        tr->tr_file, tr->tr_line);
 112         if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
 113                 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
 114                        "tr_file = %s, tr_line = %u\n",
 115                        tr->tr_num_revoke, tr->tr_revokes,
 116                        tr->tr_file, tr->tr_line);
 117
 118         gfs2_log_commit(sdp, tr);
 119
 120         gfs2_glock_dq(&tr->tr_t_gh);
 121         gfs2_holder_uninit(&tr->tr_t_gh);
 122
 123         kfree(tr);
 124
 125         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 126                 gfs2_log_flush(sdp);
 127 }
 128
 129 void gfs2_trans_add_gl(struct gfs2_glock *gl)
 130 {
 131         lops_add(gl->gl_sbd, &gl->gl_le);
 132 }
 133
 134 /**
 135  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 136  * @gl: the glock the buffer belongs to
 137  * @bh: The buffer to add
 138  * @meta: True in the case of adding metadata
 139  *
 140  */
 141
 142 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 143 {
 144         struct gfs2_sbd *sdp = gl->gl_sbd;
 145         struct gfs2_bufdata *bd;
 146
 147         bd = bh->b_private;
 148         if (bd)
 149                 gfs2_assert(sdp, bd->bd_gl == gl);
 150         else {
 151                 gfs2_attach_bufdata(gl, bh, meta);
 152                 bd = bh->b_private;
 153         }
 154         lops_add(sdp, &bd->bd_le);
 155 }
 156
 157 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
 158 {
 159         struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
 160                                          GFP_NOFS | __GFP_NOFAIL);
 161         lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
 162         rv->rv_blkno = blkno;
 163         lops_add(sdp, &rv->rv_le);
 164 }
 165
 166 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
 167 {
 168         struct gfs2_revoke *rv;
 169         int found = 0;
 170
 171         gfs2_log_lock(sdp);
 172
 173         list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
 174                 if (rv->rv_blkno == blkno) {
 175                         list_del(&rv->rv_le.le_list);
 176                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 177                         sdp->sd_log_num_revoke--;
 178                         found = 1;
 179                         break;
 180                 }
 181         }
 182
 183         gfs2_log_unlock(sdp);
 184
 185         if (found) {
 186                 struct gfs2_trans *tr = current->journal_info;
 187                 kfree(rv);
 188                 tr->tr_num_revoke_rm++;
 189         }
 190 }
 191
 192 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 193 {
 194         lops_add(rgd->rd_sbd, &rgd->rd_le);
 195 }
 196