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 <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,
  54                          GL_NEVER_RECURSE, &tr->tr_t_gh);
  55
  56         error = gfs2_glock_nq(&tr->tr_t_gh);
  57         if (error)
  58                 goto fail_holder_uninit;
  59
  60         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
  61                 tr->tr_t_gh.gh_flags |= GL_NOCACHE;
  62                 error = -EROFS;
  63                 goto fail_gunlock;
  64         }
  65
  66         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  67         if (error)
  68                 goto fail_gunlock;
  69
  70         current->journal_info = tr;
  71
  72         return 0;
  73
  74 fail_gunlock:
  75         gfs2_glock_dq(&tr->tr_t_gh);
  76
  77 fail_holder_uninit:
  78         gfs2_holder_uninit(&tr->tr_t_gh);
  79         kfree(tr);
  80
  81         return error;
  82 }
  83
  84 void gfs2_trans_end(struct gfs2_sbd *sdp)
  85 {
  86         struct gfs2_trans *tr = current->journal_info;
  87
  88         BUG_ON(!tr);
  89         current->journal_info = NULL;
  90
  91         if (!tr->tr_touched) {
  92                 gfs2_log_release(sdp, tr->tr_reserved);
  93                 gfs2_glock_dq(&tr->tr_t_gh);
  94                 gfs2_holder_uninit(&tr->tr_t_gh);
  95                 kfree(tr);
  96                 return;
  97         }
  98
  99         if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
 100                 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
 101                        tr->tr_num_buf, tr->tr_blocks);
 102                 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
 103         }
 104         if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
 105                 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
 106                        tr->tr_num_revoke, tr->tr_revokes);
 107                 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
 108         }
 109
 110         gfs2_log_commit(sdp, tr);
 111         gfs2_glock_dq(&tr->tr_t_gh);
 112         gfs2_holder_uninit(&tr->tr_t_gh);
 113         kfree(tr);
 114
 115         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 116                 gfs2_log_flush(sdp, NULL);
 117 }
 118
 119 void gfs2_trans_add_gl(struct gfs2_glock *gl)
 120 {
 121         lops_add(gl->gl_sbd, &gl->gl_le);
 122 }
 123
 124 /**
 125  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 126  * @gl: the glock the buffer belongs to
 127  * @bh: The buffer to add
 128  * @meta: True in the case of adding metadata
 129  *
 130  */
 131
 132 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 133 {
 134         struct gfs2_sbd *sdp = gl->gl_sbd;
 135         struct gfs2_bufdata *bd;
 136
 137         bd = bh->b_private;
 138         if (bd)
 139                 gfs2_assert(sdp, bd->bd_gl == gl);
 140         else {
 141                 gfs2_attach_bufdata(gl, bh, meta);
 142                 bd = bh->b_private;
 143         }
 144         lops_add(sdp, &bd->bd_le);
 145 }
 146
 147 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
 148 {
 149         struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
 150                                          GFP_NOFS | __GFP_NOFAIL);
 151         lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
 152         rv->rv_blkno = blkno;
 153         lops_add(sdp, &rv->rv_le);
 154 }
 155
 156 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
 157 {
 158         struct gfs2_revoke *rv;
 159         int found = 0;
 160
 161         gfs2_log_lock(sdp);
 162
 163         list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
 164                 if (rv->rv_blkno == blkno) {
 165                         list_del(&rv->rv_le.le_list);
 166                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 167                         sdp->sd_log_num_revoke--;
 168                         found = 1;
 169                         break;
 170                 }
 171         }
 172
 173         gfs2_log_unlock(sdp);
 174
 175         if (found) {
 176                 struct gfs2_trans *tr = current->journal_info;
 177                 kfree(rv);
 178                 tr->tr_num_revoke_rm++;
 179         }
 180 }
 181
 182 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 183 {
 184         lops_add(rgd->rd_sbd, &rgd->rd_le);
 185 }
 186