SAFE public projects git trees. - safe/jmp/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 <asm/semaphore.h>
  16
  17 #include "gfs2.h"
  18 #include "glock.h"
  19 #include "log.h"
  20 #include "lops.h"
  21 #include "meta_io.h"
  22 #include "trans.h"
  23
  24 int gfs2_trans_begin_i(struct gfs2_sbd *sdp, unsigned int blocks,
  25                        unsigned int revokes, char *file, unsigned int line)
  26 {
  27         struct gfs2_trans *tr;
  28         int error;
  29
  30         if (gfs2_assert_warn(sdp, !get_transaction) ||
  31             gfs2_assert_warn(sdp, blocks || revokes)) {
  32                 fs_warn(sdp, "(%s, %u)\n", file, line);
  33                 return -EINVAL;
  34         }
  35
  36         tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
  37         if (!tr)
  38                 return -ENOMEM;
  39
  40         tr->tr_file = file;
  41         tr->tr_line = line;
  42         tr->tr_blocks = blocks;
  43         tr->tr_revokes = revokes;
  44         tr->tr_reserved = 1;
  45         if (blocks)
  46                 tr->tr_reserved += 1 + blocks;
  47         if (revokes)
  48                 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
  49                                                    sizeof(uint64_t));
  50         INIT_LIST_HEAD(&tr->tr_list_buf);
  51
  52         error = -ENOMEM;
  53         tr->tr_t_gh = gfs2_holder_get(sdp->sd_trans_gl, LM_ST_SHARED,
  54                                       GL_NEVER_RECURSE, GFP_NOFS);
  55         if (!tr->tr_t_gh)
  56                 goto fail;
  57
  58         error = gfs2_glock_nq(tr->tr_t_gh);
  59         if (error)
  60                 goto fail_holder_put;
  61
  62         if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
  63                 tr->tr_t_gh->gh_flags |= GL_NOCACHE;
  64                 error = -EROFS;
  65                 goto fail_gunlock;
  66         }
  67
  68         error = gfs2_log_reserve(sdp, tr->tr_reserved);
  69         if (error)
  70                 goto fail_gunlock;
  71
  72         set_transaction(tr);
  73
  74         return 0;
  75
  76  fail_gunlock:
  77         gfs2_glock_dq(tr->tr_t_gh);
  78
  79  fail_holder_put:
  80         gfs2_holder_put(tr->tr_t_gh);
  81
  82  fail:
  83         kfree(tr);
  84
  85         return error;
  86 }
  87
  88 void gfs2_trans_end(struct gfs2_sbd *sdp)
  89 {
  90         struct gfs2_trans *tr;
  91         struct gfs2_holder *t_gh;
  92
  93         tr = get_transaction;
  94         set_transaction(NULL);
  95
  96         if (gfs2_assert_warn(sdp, tr))
  97                 return;
  98
  99         t_gh = tr->tr_t_gh;
 100         tr->tr_t_gh = NULL;
 101
 102         if (!tr->tr_touched) {
 103                 gfs2_log_release(sdp, tr->tr_reserved);
 104                 kfree(tr);
 105
 106                 gfs2_glock_dq(t_gh);
 107                 gfs2_holder_put(t_gh);
 108
 109                 return;
 110         }
 111
 112         if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks))
 113                 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u "
 114                        "tr_file = %s, tr_line = %u\n",
 115                        tr->tr_num_buf, tr->tr_blocks,
 116                        tr->tr_file, tr->tr_line);
 117         if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes))
 118                 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u "
 119                        "tr_file = %s, tr_line = %u\n",
 120                        tr->tr_num_revoke, tr->tr_revokes,
 121                        tr->tr_file, tr->tr_line);
 122
 123         gfs2_log_commit(sdp, tr);
 124
 125         gfs2_glock_dq(t_gh);
 126         gfs2_holder_put(t_gh);
 127
 128         if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
 129                 gfs2_log_flush(sdp);
 130 }
 131
 132 void gfs2_trans_add_gl(struct gfs2_glock *gl)
 133 {
 134         lops_add(gl->gl_sbd, &gl->gl_le);
 135 }
 136
 137 /**
 138  * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
 139  * @gl: the glock the buffer belongs to
 140  * @bh: The buffer to add
 141  * @meta: True in the case of adding metadata
 142  *
 143  */
 144
 145 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
 146 {
 147         struct gfs2_sbd *sdp = gl->gl_sbd;
 148         struct gfs2_bufdata *bd;
 149
 150         bd = get_v2bd(bh);
 151         if (bd)
 152                 gfs2_assert(sdp, bd->bd_gl == gl);
 153         else {
 154                 gfs2_attach_bufdata(gl, bh, meta);
 155                 bd = get_v2bd(bh);
 156         }
 157         lops_add(sdp, &bd->bd_le);
 158 }
 159
 160 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
 161 {
 162         struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
 163                                          GFP_NOFS | __GFP_NOFAIL);
 164         lops_init_le(&rv->rv_le, &gfs2_revoke_lops);
 165         rv->rv_blkno = blkno;
 166         lops_add(sdp, &rv->rv_le);
 167 }
 168
 169 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno)
 170 {
 171         struct gfs2_revoke *rv;
 172         int found = 0;
 173
 174         gfs2_log_lock(sdp);
 175
 176         list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) {
 177                 if (rv->rv_blkno == blkno) {
 178                         list_del(&rv->rv_le.le_list);
 179                         gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
 180                         sdp->sd_log_num_revoke--;
 181                         found = 1;
 182                         break;
 183                 }
 184         }
 185
 186         gfs2_log_unlock(sdp);
 187
 188         if (found) {
 189                 kfree(rv);
 190                 get_transaction->tr_num_revoke_rm++;
 191         }
 192 }
 193
 194 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
 195 {
 196         lops_add(rgd->rd_sbd, &rgd->rd_le);
 197 }
 198