git.oblomov.eu Git - linux-2.6/blob - 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 void gfs2_trans_add_gl(struct gfs2_glock *gl)
 118 {
 119         lops_add(gl->gl_sbd, &gl->gl_le);
 120 }
 121
 122 /**
 123  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 124  * @gl: the glock the buffer belongs to
 125  * @bh: The buffer to add
 126  * @meta: True in the case of adding metadata
 127  *
 128  */
 129
 130 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 131 {
 132         struct gfs2_sbd *sdp = gl->gl_sbd;
 133         struct gfs2_bufdata *bd;
 134
 135         bd = bh->b_private;
 136         if (bd)
 137                 gfs2_assert(sdp, bd->bd_gl == gl);
 138         else {
 139                 gfs2_attach_bufdata(gl, bh, meta);
 140                 bd = bh->b_private;
 141         }
 142         lops_add(sdp, &bd->bd_le);
 143 }
 144
 145 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, u64 blkno)
 146 {
 147         struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
 148                                          GFP_NOFS | __GFP_NOFAIL);
 149         lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
 150         rv->rv_blkno = blkno;
 151         lops_add(sdp, &rv->rv_le);
 152 }
 153
 154 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno)
 155 {
 156         struct gfs2_revoke *rv;
 157         int found = 0;
 158
 159         gfs2_log_lock(sdp);
 160
 161         list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
 162                 if (rv->rv_blkno == blkno) {
 163                         list_del(&rv->rv_le.le_list);
 164                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 165                         sdp->sd_log_num_revoke--;
 166                         found = 1;
 167                         break;
 168                 }
 169         }
 170
 171         gfs2_log_unlock(sdp);
 172
 173         if (found) {
 174                 struct gfs2_trans *tr = current->journal_info;
 175                 kfree(rv);
 176                 tr->tr_num_revoke_rm++;
 177         }
 178 }
 179
 180 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 181 {
 182         lops_add(rgd->rd_sbd, &rgd->rd_le);
 183 }
 184