err.no Git - linux-2.6/blob - fs/gfs2/trans.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 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 <linux/kallsyms.h>
  17 #include <asm/semaphore.h>
  18
  19 #include "gfs2.h"
  20 #include "lm_interface.h"
  21 #include "incore.h"
  22 #include "glock.h"
  23 #include "log.h"
  24 #include "lops.h"
  25 #include "meta_io.h"
  26 #include "trans.h"
  27 #include "util.h"
  28
  29 int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
  30                      unsigned int revokes)
  31 {
  32         struct gfs2_trans *tr;
  33         int error;
  34
  35         BUG_ON(current->journal_info);
  36         BUG_ON(blocks == 0 && revokes == 0);
  37
  38         tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
  39         if (!tr)
  40                 return -ENOMEM;
  41
  42         tr->tr_ip = (unsigned long)__builtin_return_address(0);
  43         tr->tr_blocks = blocks;
  44         tr->tr_revokes = revokes;
  45         tr->tr_reserved = 1;
  46         if (blocks)
  47                 tr->tr_reserved += 6 + blocks;
  48         if (revokes)
  49                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
  50                                                    sizeof(uint64_t));
  51         INIT_LIST_HEAD(&tr->tr_list_buf);
  52
  53         gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
  54
  55         error = gfs2_glock_nq(&tr->tr_t_gh);
  56         if (error)
  57                 goto fail_holder_uninit;
  58
  59         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
  60                 tr->tr_t_gh.gh_flags |= GL_NOCACHE;
  61                 error = -EROFS;
  62                 goto fail_gunlock;
  63         }
  64
  65         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  66         if (error)
  67                 goto fail_gunlock;
  68
  69         current->journal_info = tr;
  70
  71         return 0;
  72
  73 fail_gunlock:
  74         gfs2_glock_dq(&tr->tr_t_gh);
  75
  76 fail_holder_uninit:
  77         gfs2_holder_uninit(&tr->tr_t_gh);
  78         kfree(tr);
  79
  80         return error;
  81 }
  82
  83 void gfs2_trans_end(struct gfs2_sbd *sdp)
  84 {
  85         struct gfs2_trans *tr = current->journal_info;
  86
  87         BUG_ON(!tr);
  88         current->journal_info = NULL;
  89
  90         if (!tr->tr_touched) {
  91                 gfs2_log_release(sdp, tr->tr_reserved);
  92                 gfs2_glock_dq(&tr->tr_t_gh);
  93                 gfs2_holder_uninit(&tr->tr_t_gh);
  94                 kfree(tr);
  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         gfs2_glock_dq(&tr->tr_t_gh);
 111         gfs2_holder_uninit(&tr->tr_t_gh);
 112         kfree(tr);
 113
 114         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 115                 gfs2_log_flush(sdp, NULL);
 116 }
 117
 118 void gfs2_trans_add_gl(struct gfs2_glock *gl)
 119 {
 120         lops_add(gl->gl_sbd, &gl->gl_le);
 121 }
 122
 123 /**
 124  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 125  * @gl: the glock the buffer belongs to
 126  * @bh: The buffer to add
 127  * @meta: True in the case of adding metadata
 128  *
 129  */
 130
 131 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 132 {
 133         struct gfs2_sbd *sdp = gl->gl_sbd;
 134         struct gfs2_bufdata *bd;
 135
 136         bd = bh->b_private;
 137         if (bd)
 138                 gfs2_assert(sdp, bd->bd_gl == gl);
 139         else {
 140                 gfs2_attach_bufdata(gl, bh, meta);
 141                 bd = bh->b_private;
 142         }
 143         lops_add(sdp, &bd->bd_le);
 144 }
 145
 146 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
 147 {
 148         struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
 149                                          GFP_NOFS | __GFP_NOFAIL);
 150         lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
 151         rv->rv_blkno = blkno;
 152         lops_add(sdp, &rv->rv_le);
 153 }
 154
 155 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
 156 {
 157         struct gfs2_revoke *rv;
 158         int found = 0;
 159
 160         gfs2_log_lock(sdp);
 161
 162         list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
 163                 if (rv->rv_blkno == blkno) {
 164                         list_del(&rv->rv_le.le_list);
 165                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 166                         sdp->sd_log_num_revoke--;
 167                         found = 1;
 168                         break;
 169                 }
 170         }
 171
 172         gfs2_log_unlock(sdp);
 173
 174         if (found) {
 175                 struct gfs2_trans *tr = current->journal_info;
 176                 kfree(rv);
 177                 tr->tr_num_revoke_rm++;
 178         }
 179 }
 180
 181 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 182 {
 183         lops_add(rgd->rd_sbd, &rgd->rd_le);
 184 }
 185