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-rw-r--r--fs/gfs2/trans.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/fs/gfs2/trans.c b/fs/gfs2/trans.c
new file mode 100644
index 000000000000..afa5408c0008
--- /dev/null
+++ b/fs/gfs2/trans.c
@@ -0,0 +1,214 @@
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
24int 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_KERNEL);
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_KERNEL);
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
88void 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
132void 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 *
142 */
143
144void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh)
145{
146 struct gfs2_sbd *sdp = gl->gl_sbd;
147 struct gfs2_bufdata *bd;
148
149 bd = get_v2bd(bh);
150 if (bd)
151 gfs2_assert(sdp, bd->bd_gl == gl);
152 else {
153 gfs2_meta_attach_bufdata(gl, bh);
154 bd = get_v2bd(bh);
155 }
156
157 lops_add(sdp, &bd->bd_le);
158}
159
160void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno)
161{
162 struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke),
163 GFP_KERNEL | __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
169void 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
194void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd)
195{
196 lops_add(rgd->rd_sbd, &rgd->rd_le);
197}
198
199void gfs2_trans_add_databuf(struct gfs2_sbd *sdp, struct buffer_head *bh)
200{
201 struct gfs2_databuf *db;
202
203 db = get_v2db(bh);
204 if (!db) {
205 db = kmalloc(sizeof(struct gfs2_databuf),
206 GFP_KERNEL | __GFP_NOFAIL);
207 lops_init_le(&db->db_le, &gfs2_databuf_lops);
208 get_bh(bh);
209 db->db_bh = bh;
210 set_v2db(bh, db);
211 lops_add(sdp, &db->db_le);
212 }
213}
214