Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...
[linux-2.6] / 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