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/gfs2_ondisk.h>
16 #include <linux/kallsyms.h>
17 #include <linux/lm_interface.h>
18
19 #include "gfs2.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(struct gfs2_sbd *sdp, unsigned int blocks,
29 unsigned int revokes)
30 {
31 struct gfs2_trans *tr;
32 int error;
33
34 BUG_ON(current->journal_info);
35 BUG_ON(blocks == 0 && revokes == 0);
36
37 tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS);
38 if (!tr)
39 return -ENOMEM;
40
41 tr->tr_ip = (unsigned long)__builtin_return_address(0);
42 tr->tr_blocks = blocks;
43 tr->tr_revokes = revokes;
44 tr->tr_reserved = 1;
45 if (blocks)
46 tr->tr_reserved += 6 + blocks;
47 if (revokes)
48 tr->tr_reserved += gfs2_struct2blk(sdp, revokes,
49 sizeof(u64));
50 INIT_LIST_HEAD(&tr->tr_list_buf);
51
52 gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh);
53
54 error = gfs2_glock_nq(&tr->tr_t_gh);
55 if (error)
56 goto fail_holder_uninit;
57
58 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
59 tr->tr_t_gh.gh_flags |= GL_NOCACHE;
60 error = -EROFS;
61 goto fail_gunlock;
62 }
63
64 error = gfs2_log_reserve(sdp, tr->tr_reserved);
65 if (error)
66 goto fail_gunlock;
67
68 current->journal_info = tr;
69
70 return 0;
71
72 fail_gunlock:
73 gfs2_glock_dq(&tr->tr_t_gh);
74
75 fail_holder_uninit:
76 gfs2_holder_uninit(&tr->tr_t_gh);
77 kfree(tr);
78
79 return error;
80 }
81
82 void gfs2_trans_end(struct gfs2_sbd *sdp)
83 {
84 struct gfs2_trans *tr = current->journal_info;
85
86 BUG_ON(!tr);
87 current->journal_info = NULL;
88
89 if (!tr->tr_touched) {
90 gfs2_log_release(sdp, tr->tr_reserved);
91 gfs2_glock_dq(&tr->tr_t_gh);
92 gfs2_holder_uninit(&tr->tr_t_gh);
93 kfree(tr);
94 return;
95 }
96
97 if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) {
98 fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ",
99 tr->tr_num_buf, tr->tr_blocks);
100 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
101 }
102 if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) {
103 fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ",
104 tr->tr_num_revoke, tr->tr_revokes);
105 print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip);
106 }
107
108 gfs2_log_commit(sdp, tr);
109 gfs2_glock_dq(&tr->tr_t_gh);
110 gfs2_holder_uninit(&tr->tr_t_gh);
111 kfree(tr);
112
113 if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
114 gfs2_log_flush(sdp, NULL);
115 }
116
117 /**
118 * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction
119 * @gl: the glock the buffer belongs to
120 * @bh: The buffer to add
121 * @meta: True in the case of adding metadata
122 *
123 */
124
125 void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta)
126 {
127 struct gfs2_sbd *sdp = gl->gl_sbd;
128 struct gfs2_bufdata *bd;
129
130 bd = bh->b_private;
131 if (bd)
132 gfs2_assert(sdp, bd->bd_gl == gl);
133 else {
134 gfs2_attach_bufdata(gl, bh, meta);
135 bd = bh->b_private;
136 }
137 lops_add(sdp, &bd->bd_le);
138 }
139
140 void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
141 {
142 BUG_ON(!list_empty(&bd->bd_le.le_list));
143 BUG_ON(!list_empty(&bd->bd_ail_st_list));
144 BUG_ON(!list_empty(&bd->bd_ail_gl_list));
145 lops_init_le(&bd->bd_le, &gfs2_revoke_lops);
146 lops_add(sdp, &bd->bd_le);
147 }
148
149 void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno)
150 {
151 struct gfs2_bufdata *bd;
152 int found = 0;
153
154 gfs2_log_lock(sdp);
155
156 list_for_each_entry(bd, &sdp->sd_log_le_revoke, bd_le.le_list) {
157 if (bd->bd_blkno == blkno) {
158 list_del_init(&bd->bd_le.le_list);
159 gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke);
160 sdp->sd_log_num_revoke--;
161 found = 1;
162 break;
163 }
164 }
165
166 gfs2_log_unlock(sdp);
167
168 if (found) {
169 struct gfs2_trans *tr = current->journal_info;
170 kmem_cache_free(gfs2_bufdata_cachep, bd);
171 tr->tr_num_revoke_rm++;
172 }
173 }
174
175 void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
176 {
177 lops_add(rgd->rd_sbd, &rgd->rd_le);
178 }
179
180
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