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 <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         error = -ENOMEM;
  57         tr->tr_t_gh = gfs2_holder_get(sdp->sd_trans_gl, LM_ST_SHARED,
  58                                       GL_NEVER_RECURSE, GFP_NOFS);
  59         if (!tr->tr_t_gh)
  60                 goto fail;
  61
  62         error = gfs2_glock_nq(tr->tr_t_gh);
  63         if (error)
  64                 goto fail_holder_put;
  65
  66         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
  67                 tr->tr_t_gh->gh_flags |= GL_NOCACHE;
  68                 error = -EROFS;
  69                 goto fail_gunlock;
  70         }
  71
  72         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  73         if (error)
  74                 goto fail_gunlock;
  75
  76         current->journal_info = tr;
  77
  78         return 0;
  79
  80  fail_gunlock:
  81         gfs2_glock_dq(tr->tr_t_gh);
  82
  83  fail_holder_put:
  84         gfs2_holder_put(tr->tr_t_gh);
  85
  86  fail:
  87         kfree(tr);
  88
  89         return error;
  90 }
  91
  92 void gfs2_trans_end(struct gfs2_sbd *sdp)
  93 {
  94         struct gfs2_trans *tr;
  95         struct gfs2_holder *t_gh;
  96
  97         tr = current->journal_info;
  98         current->journal_info = NULL;
  99
 100         if (gfs2_assert_warn(sdp, tr))
 101                 return;
 102
 103         t_gh = tr->tr_t_gh;
 104         tr->tr_t_gh = NULL;
 105
 106         if (!tr->tr_touched) {
 107                 gfs2_log_release(sdp, tr->tr_reserved);
 108                 kfree(tr);
 109
 110                 gfs2_glock_dq(t_gh);
 111                 gfs2_holder_put(t_gh);
 112
 113                 return;
 114         }
 115
 116         if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
 117                 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
 118                        "tr_file = %s, tr_line = %u\n",
 119                        tr->tr_num_buf, tr->tr_blocks,
 120                        tr->tr_file, tr->tr_line);
 121         if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
 122                 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
 123                        "tr_file = %s, tr_line = %u\n",
 124                        tr->tr_num_revoke, tr->tr_revokes,
 125                        tr->tr_file, tr->tr_line);
 126
 127         gfs2_log_commit(sdp, tr);
 128
 129         gfs2_glock_dq(t_gh);
 130         gfs2_holder_put(t_gh);
 131
 132         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 133                 gfs2_log_flush(sdp);
 134 }
 135
 136 void gfs2_trans_add_gl(struct gfs2_glock *gl)
 137 {
 138         lops_add(gl->gl_sbd, &gl->gl_le);
 139 }
 140
 141 /**
 142  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 143  * @gl: the glock the buffer belongs to
 144  * @bh: The buffer to add
 145  * @meta: True in the case of adding metadata
 146  *
 147  */
 148
 149 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 150 {
 151         struct gfs2_sbd *sdp = gl->gl_sbd;
 152         struct gfs2_bufdata *bd;
 153
 154         bd = bh->b_private;
 155         if (bd)
 156                 gfs2_assert(sdp, bd->bd_gl == gl);
 157         else {
 158                 gfs2_attach_bufdata(gl, bh, meta);
 159                 bd = bh->b_private;
 160         }
 161         lops_add(sdp, &bd->bd_le);
 162 }
 163
 164 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
 165 {
 166         struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
 167                                          GFP_NOFS | __GFP_NOFAIL);
 168         lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
 169         rv->rv_blkno = blkno;
 170         lops_add(sdp, &rv->rv_le);
 171 }
 172
 173 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
 174 {
 175         struct gfs2_revoke *rv;
 176         int found = 0;
 177
 178         gfs2_log_lock(sdp);
 179
 180         list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
 181                 if (rv->rv_blkno == blkno) {
 182                         list_del(&rv->rv_le.le_list);
 183                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 184                         sdp->sd_log_num_revoke--;
 185                         found = 1;
 186                         break;
 187                 }
 188         }
 189
 190         gfs2_log_unlock(sdp);
 191
 192         if (found) {
 193                 struct gfs2_trans *tr = current->journal_info;
 194                 kfree(rv);
 195                 tr->tr_num_revoke_rm++;
 196         }
 197 }
 198
 199 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 200 {
 201         lops_add(rgd->rd_sbd, &rgd->rd_le);
 202 }
 203