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b3b94faa DT |
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> | |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
d0dc80db | 16 | #include <linux/kallsyms.h> |
b3b94faa DT |
17 | #include <asm/semaphore.h> |
18 | ||
19 | #include "gfs2.h" | |
5c676f6d SW |
20 | #include "lm_interface.h" |
21 | #include "incore.h" | |
b3b94faa DT |
22 | #include "glock.h" |
23 | #include "log.h" | |
24 | #include "lops.h" | |
25 | #include "meta_io.h" | |
26 | #include "trans.h" | |
5c676f6d | 27 | #include "util.h" |
b3b94faa | 28 | |
d0dc80db SW |
29 | int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, |
30 | unsigned int revokes) | |
b3b94faa DT |
31 | { |
32 | struct gfs2_trans *tr; | |
33 | int error; | |
34 | ||
d0dc80db SW |
35 | BUG_ON(current->journal_info); |
36 | BUG_ON(blocks == 0 && revokes == 0); | |
b3b94faa | 37 | |
f55ab26a | 38 | tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); |
b3b94faa DT |
39 | if (!tr) |
40 | return -ENOMEM; | |
41 | ||
d0dc80db | 42 | tr->tr_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
43 | tr->tr_blocks = blocks; |
44 | tr->tr_revokes = revokes; | |
45 | tr->tr_reserved = 1; | |
46 | if (blocks) | |
47 | tr->tr_reserved += 1 + blocks; | |
48 | if (revokes) | |
49 | tr->tr_reserved += gfs2_struct2blk(sdp, revokes, | |
50 | sizeof(uint64_t)); | |
51 | INIT_LIST_HEAD(&tr->tr_list_buf); | |
52 | ||
e317ffcb SW |
53 | gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, |
54 | GL_NEVER_RECURSE, &tr->tr_t_gh); | |
b3b94faa | 55 | |
e317ffcb | 56 | error = gfs2_glock_nq(&tr->tr_t_gh); |
b3b94faa | 57 | if (error) |
e317ffcb | 58 | goto fail_holder_uninit; |
b3b94faa DT |
59 | |
60 | if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { | |
e317ffcb | 61 | tr->tr_t_gh.gh_flags |= GL_NOCACHE; |
b3b94faa DT |
62 | error = -EROFS; |
63 | goto fail_gunlock; | |
64 | } | |
65 | ||
66 | error = gfs2_log_reserve(sdp, tr->tr_reserved); | |
67 | if (error) | |
68 | goto fail_gunlock; | |
69 | ||
5c676f6d | 70 | current->journal_info = tr; |
b3b94faa DT |
71 | |
72 | return 0; | |
73 | ||
484adff8 | 74 | fail_gunlock: |
e317ffcb | 75 | gfs2_glock_dq(&tr->tr_t_gh); |
b3b94faa | 76 | |
484adff8 | 77 | fail_holder_uninit: |
e317ffcb | 78 | gfs2_holder_uninit(&tr->tr_t_gh); |
b3b94faa DT |
79 | kfree(tr); |
80 | ||
81 | return error; | |
82 | } | |
83 | ||
84 | void gfs2_trans_end(struct gfs2_sbd *sdp) | |
85 | { | |
86 | struct gfs2_trans *tr; | |
b3b94faa | 87 | |
5c676f6d SW |
88 | tr = current->journal_info; |
89 | current->journal_info = NULL; | |
b3b94faa DT |
90 | |
91 | if (gfs2_assert_warn(sdp, tr)) | |
92 | return; | |
93 | ||
b3b94faa DT |
94 | if (!tr->tr_touched) { |
95 | gfs2_log_release(sdp, tr->tr_reserved); | |
b3b94faa | 96 | |
b4dc7291 SW |
97 | gfs2_glock_dq(&tr->tr_t_gh); |
98 | gfs2_holder_uninit(&tr->tr_t_gh); | |
b3b94faa | 99 | |
e317ffcb | 100 | kfree(tr); |
b3b94faa DT |
101 | return; |
102 | } | |
103 | ||
d0dc80db SW |
104 | if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) { |
105 | fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ", | |
106 | tr->tr_num_buf, tr->tr_blocks); | |
107 | print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); | |
108 | } | |
b3b94faa | 109 | if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) |
d0dc80db SW |
110 | fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ", |
111 | tr->tr_num_revoke, tr->tr_revokes); | |
112 | print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); | |
b3b94faa DT |
113 | |
114 | gfs2_log_commit(sdp, tr); | |
115 | ||
b4dc7291 SW |
116 | gfs2_glock_dq(&tr->tr_t_gh); |
117 | gfs2_holder_uninit(&tr->tr_t_gh); | |
118 | ||
119 | kfree(tr); | |
b3b94faa DT |
120 | |
121 | if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) | |
122 | gfs2_log_flush(sdp); | |
123 | } | |
124 | ||
125 | void gfs2_trans_add_gl(struct gfs2_glock *gl) | |
126 | { | |
127 | lops_add(gl->gl_sbd, &gl->gl_le); | |
128 | } | |
129 | ||
130 | /** | |
131 | * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction | |
132 | * @gl: the glock the buffer belongs to | |
133 | * @bh: The buffer to add | |
d4e9c4c3 | 134 | * @meta: True in the case of adding metadata |
b3b94faa DT |
135 | * |
136 | */ | |
137 | ||
d4e9c4c3 | 138 | void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) |
b3b94faa DT |
139 | { |
140 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
141 | struct gfs2_bufdata *bd; | |
142 | ||
5c676f6d | 143 | bd = bh->b_private; |
b3b94faa DT |
144 | if (bd) |
145 | gfs2_assert(sdp, bd->bd_gl == gl); | |
146 | else { | |
586dfdaa | 147 | gfs2_attach_bufdata(gl, bh, meta); |
5c676f6d | 148 | bd = bh->b_private; |
b3b94faa | 149 | } |
b3b94faa DT |
150 | lops_add(sdp, &bd->bd_le); |
151 | } | |
152 | ||
153 | void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, uint64_t blkno) | |
154 | { | |
155 | struct gfs2_revoke *rv = kmalloc(sizeof(struct gfs2_revoke), | |
18ec7d5c | 156 | GFP_NOFS | __GFP_NOFAIL); |
b3b94faa DT |
157 | lops_init_le(&rv->rv_le, &gfs2_revoke_lops); |
158 | rv->rv_blkno = blkno; | |
159 | lops_add(sdp, &rv->rv_le); | |
160 | } | |
161 | ||
162 | void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, uint64_t blkno) | |
163 | { | |
164 | struct gfs2_revoke *rv; | |
165 | int found = 0; | |
166 | ||
167 | gfs2_log_lock(sdp); | |
168 | ||
169 | list_for_each_entry(rv, &sdp->sd_log_le_revoke, rv_le.le_list) { | |
170 | if (rv->rv_blkno == blkno) { | |
171 | list_del(&rv->rv_le.le_list); | |
172 | gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); | |
173 | sdp->sd_log_num_revoke--; | |
174 | found = 1; | |
175 | break; | |
176 | } | |
177 | } | |
178 | ||
179 | gfs2_log_unlock(sdp); | |
180 | ||
181 | if (found) { | |
5c676f6d | 182 | struct gfs2_trans *tr = current->journal_info; |
b3b94faa | 183 | kfree(rv); |
5c676f6d | 184 | tr->tr_num_revoke_rm++; |
b3b94faa DT |
185 | } |
186 | } | |
187 | ||
188 | void gfs2_trans_add_rg(struct gfs2_rgrpd *rgd) | |
189 | { | |
190 | lops_add(rgd->rd_sbd, &rgd->rd_le); | |
191 | } | |
192 |