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/kallsyms.h>
  16 #include <linux/gfs2_ondisk.h>
  17
  18 #include "gfs2.h"
  19 #include "incore.h"
  20 #include "glock.h"
  21 #include "log.h"
  22 #include "lops.h"
  23 #include "meta_io.h"
  24 #include "trans.h"
  25 #include "util.h"
  26
  27 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
  28                      unsigned int revokes)
  29 {
  30         struct gfs2_trans *tr;
  31         int error;
  32
  33         BUG_ON(current->journal_info);
  34         BUG_ON(blocks == 0 && revokes == 0);
  35
  36         tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
  37         if (!tr)
  38                 return -ENOMEM;
  39
  40         tr->tr_ip = (unsigned long)__builtin_return_address(0);
  41         tr->tr_blocks = blocks;
  42         tr->tr_revokes = revokes;
  43         tr->tr_reserved = 1;
  44         if (blocks)
  45                 tr->tr_reserved += 6 + blocks;
  46         if (revokes)
  47                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
  48                                                    sizeof(u64));
  49         INIT_LIST_HEAD(&tr->tr_list_buf);
  50
  51         gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
  52
  53         error = gfs2_glock_nq(&tr->tr_t_gh);
  54         if (error)
  55                 goto fail_holder_uninit;
  56
  57         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
  58                 tr->tr_t_gh.gh_flags |= GL_NOCACHE;
  59                 error = -EROFS;
  60                 goto fail_gunlock;
  61         }
  62
  63         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  64         if (error)
  65                 goto fail_gunlock;
  66
  67         current->journal_info = tr;
  68
  69         return 0;
  70
  71 fail_gunlock:
  72         gfs2_glock_dq(&tr->tr_t_gh);
  73
  74 fail_holder_uninit:
  75         gfs2_holder_uninit(&tr->tr_t_gh);
  76         kfree(tr);
  77
  78         return error;
  79 }
  80
  81 void gfs2_trans_end(struct gfs2_sbd *sdp)
  82 {
  83         struct gfs2_trans *tr = current->journal_info;
  84
  85         BUG_ON(!tr);
  86         current->journal_info = NULL;
  87
  88         if (!tr->tr_touched) {
  89                 gfs2_log_release(sdp, tr->tr_reserved);
  90                 if (tr->tr_t_gh.gh_gl) {
  91                         gfs2_glock_dq(&tr->tr_t_gh);
  92                         gfs2_holder_uninit(&tr->tr_t_gh);
  93                         kfree(tr);
  94                 }
  95                 return;
  96         }
  97
  98         if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
  99                 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
 100                        tr->tr_num_buf, tr->tr_blocks);
 101                 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
 102         }
 103         if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
 104                 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
 105                        tr->tr_num_revoke, tr->tr_revokes);
 106                 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
 107         }
 108
 109         gfs2_log_commit(sdp, tr);
 110         if (tr->tr_t_gh.gh_gl) {
 111                 gfs2_glock_dq(&tr->tr_t_gh);
 112                 gfs2_holder_uninit(&tr->tr_t_gh);
 113                 kfree(tr);
 114         }
 115
 116         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 117                 gfs2_log_flush(sdp, NULL);
 118 }
 119
 120 /**
 121  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 122  * @gl: the glock the buffer belongs to
 123  * @bh: The buffer to add
 124  * @meta: True in the case of adding metadata
 125  *
 126  */
 127
 128 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 129 {
 130         struct gfs2_sbd *sdp = gl->gl_sbd;
 131         struct gfs2_bufdata *bd;
 132
 133         bd = bh->b_private;
 134         if (bd)
 135                 gfs2_assert(sdp, bd->bd_gl == gl);
 136         else {
 137                 gfs2_attach_bufdata(gl, bh, meta);
 138                 bd = bh->b_private;
 139         }
 140         lops_add(sdp, &bd->bd_le);
 141 }
 142
 143 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
 144 {
 145         BUG_ON(!list_empty(&bd->bd_le.le_list));
 146         BUG_ON(!list_empty(&bd->bd_ail_st_list));
 147         BUG_ON(!list_empty(&bd->bd_ail_gl_list));
 148         lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
 149         lops_add(sdp, &bd->bd_le);
 150 }
 151
 152 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len)
 153 {
 154         struct gfs2_bufdata *bd, *tmp;
 155         struct gfs2_trans *tr = current->journal_info;
 156         unsigned int n = len;
 157
 158         gfs2_log_lock(sdp);
 159         list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_le.le_list) {
 160                 if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) {
 161                         list_del_init(&bd->bd_le.le_list);
 162                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 163                         sdp->sd_log_num_revoke--;
 164                         kmem_cache_free(gfs2_bufdata_cachep, bd);
 165                         tr->tr_num_revoke_rm++;
 166                         if (--n == 0)
 167                                 break;
 168                 }
 169         }
 170         gfs2_log_unlock(sdp);
 171 }
 172
 173 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 174 {
 175         lops_add(rgd->rd_sbd, &rgd->rd_le);
 176 }
 177