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         struct gfs2_holder *t_gh;
  91
  92         tr = current->journal_info;
  93         current->journal_info = NULL;
  94
  95         if (gfs2_assert_warn(sdp, tr))
  96                 return;
  97
  98         t_gh = &tr->tr_t_gh;
  99
 100         if (!tr->tr_touched) {
 101                 gfs2_log_release(sdp, tr->tr_reserved);
 102
 103                 gfs2_glock_dq(t_gh);
 104                 gfs2_holder_uninit(t_gh);
 105
 106                 kfree(tr);
 107                 return;
 108         }
 109
 110         if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
 111                 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
 112                        "tr_file = %s, tr_line = %u\n",
 113                        tr->tr_num_buf, tr->tr_blocks,
 114                        tr->tr_file, tr->tr_line);
 115         if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
 116                 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
 117                        "tr_file = %s, tr_line = %u\n",
 118                        tr->tr_num_revoke, tr->tr_revokes,
 119                        tr->tr_file, tr->tr_line);
 120
 121         gfs2_log_commit(sdp, tr);
 122
 123         gfs2_glock_dq(t_gh);
 124         gfs2_holder_uninit(t_gh);
 125
 126         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 127                 gfs2_log_flush(sdp);
 128 }
 129
 130 void gfs2_trans_add_gl(struct gfs2_glock *gl)
 131 {
 132         lops_add(gl->gl_sbd, &gl->gl_le);
 133 }
 134
 135 /**
 136  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 137  * @gl: the glock the buffer belongs to
 138  * @bh: The buffer to add
 139  * @meta: True in the case of adding metadata
 140  *
 141  */
 142
 143 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 144 {
 145         struct gfs2_sbd *sdp = gl->gl_sbd;
 146         struct gfs2_bufdata *bd;
 147
 148         bd = bh->b_private;
 149         if (bd)
 150                 gfs2_assert(sdp, bd->bd_gl == gl);
 151         else {
 152                 gfs2_attach_bufdata(gl, bh, meta);
 153                 bd = bh->b_private;
 154         }
 155         lops_add(sdp, &bd->bd_le);
 156 }
 157
 158 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
 159 {
 160         struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
 161                                          GFP_NOFS | __GFP_NOFAIL);
 162         lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
 163         rv->rv_blkno = blkno;
 164         lops_add(sdp, &rv->rv_le);
 165 }
 166
 167 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
 168 {
 169         struct gfs2_revoke *rv;
 170         int found = 0;
 171
 172         gfs2_log_lock(sdp);
 173
 174         list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
 175                 if (rv->rv_blkno == blkno) {
 176                         list_del(&rv->rv_le.le_list);
 177                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 178                         sdp->sd_log_num_revoke--;
 179                         found = 1;
 180                         break;
 181                 }
 182         }
 183
 184         gfs2_log_unlock(sdp);
 185
 186         if (found) {
 187                 struct gfs2_trans *tr = current->journal_info;
 188                 kfree(rv);
 189                 tr->tr_num_revoke_rm++;
 190         }
 191 }
 192
 193 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 194 {
 195         lops_add(rgd->rd_sbd, &rgd->rd_le);
 196 }
 197