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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3a8a9a10 | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
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> | |
d0dc80db | 15 | #include <linux/kallsyms.h> |
f057f6cd | 16 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
17 | |
18 | #include "gfs2.h" | |
5c676f6d | 19 | #include "incore.h" |
b3b94faa DT |
20 | #include "glock.h" |
21 | #include "log.h" | |
22 | #include "lops.h" | |
23 | #include "meta_io.h" | |
24 | #include "trans.h" | |
5c676f6d | 25 | #include "util.h" |
5e687eac | 26 | #include "trace_gfs2.h" |
b3b94faa | 27 | |
d0dc80db SW |
28 | int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, |
29 | unsigned int revokes) | |
b3b94faa DT |
30 | { |
31 | struct gfs2_trans *tr; | |
32 | int error; | |
33 | ||
d0dc80db SW |
34 | BUG_ON(current->journal_info); |
35 | BUG_ON(blocks == 0 && revokes == 0); | |
b3b94faa | 36 | |
a1c0643f SW |
37 | if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) |
38 | return -EROFS; | |
39 | ||
f55ab26a | 40 | tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); |
b3b94faa DT |
41 | if (!tr) |
42 | return -ENOMEM; | |
43 | ||
d0dc80db | 44 | tr->tr_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
45 | tr->tr_blocks = blocks; |
46 | tr->tr_revokes = revokes; | |
47 | tr->tr_reserved = 1; | |
48 | if (blocks) | |
f4154ea0 | 49 | tr->tr_reserved += 6 + blocks; |
b3b94faa DT |
50 | if (revokes) |
51 | tr->tr_reserved += gfs2_struct2blk(sdp, revokes, | |
cd915493 | 52 | sizeof(u64)); |
579b78a4 | 53 | gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); |
b3b94faa | 54 | |
e317ffcb | 55 | error = gfs2_glock_nq(&tr->tr_t_gh); |
b3b94faa | 56 | if (error) |
e317ffcb | 57 | goto fail_holder_uninit; |
b3b94faa | 58 | |
b3b94faa DT |
59 | error = gfs2_log_reserve(sdp, tr->tr_reserved); |
60 | if (error) | |
61 | goto fail_gunlock; | |
62 | ||
5c676f6d | 63 | current->journal_info = tr; |
b3b94faa DT |
64 | |
65 | return 0; | |
66 | ||
484adff8 | 67 | fail_gunlock: |
e317ffcb | 68 | gfs2_glock_dq(&tr->tr_t_gh); |
b3b94faa | 69 | |
484adff8 | 70 | fail_holder_uninit: |
e317ffcb | 71 | gfs2_holder_uninit(&tr->tr_t_gh); |
b3b94faa DT |
72 | kfree(tr); |
73 | ||
74 | return error; | |
75 | } | |
76 | ||
5e687eac BM |
77 | /** |
78 | * gfs2_log_release - Release a given number of log blocks | |
79 | * @sdp: The GFS2 superblock | |
80 | * @blks: The number of blocks | |
81 | * | |
82 | */ | |
83 | ||
84 | static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) | |
85 | { | |
86 | ||
87 | atomic_add(blks, &sdp->sd_log_blks_free); | |
88 | trace_gfs2_log_blocks(sdp, blks); | |
89 | gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= | |
90 | sdp->sd_jdesc->jd_blocks); | |
91 | up_read(&sdp->sd_log_flush_lock); | |
92 | } | |
93 | ||
c50b91c4 SW |
94 | static void gfs2_print_trans(const struct gfs2_trans *tr) |
95 | { | |
96 | print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); | |
97 | printk(KERN_WARNING "GFS2: blocks=%u revokes=%u reserved=%u touched=%d\n", | |
98 | tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched); | |
99 | printk(KERN_WARNING "GFS2: Buf %u/%u Databuf %u/%u Revoke %u/%u\n", | |
100 | tr->tr_num_buf_new, tr->tr_num_buf_rm, | |
101 | tr->tr_num_databuf_new, tr->tr_num_databuf_rm, | |
102 | tr->tr_num_revoke, tr->tr_num_revoke_rm); | |
103 | } | |
104 | ||
b3b94faa DT |
105 | void gfs2_trans_end(struct gfs2_sbd *sdp) |
106 | { | |
f4154ea0 | 107 | struct gfs2_trans *tr = current->journal_info; |
c50b91c4 | 108 | s64 nbuf; |
f4154ea0 | 109 | BUG_ON(!tr); |
5c676f6d | 110 | current->journal_info = NULL; |
b3b94faa | 111 | |
b3b94faa DT |
112 | if (!tr->tr_touched) { |
113 | gfs2_log_release(sdp, tr->tr_reserved); | |
d8348de0 SW |
114 | if (tr->tr_t_gh.gh_gl) { |
115 | gfs2_glock_dq(&tr->tr_t_gh); | |
116 | gfs2_holder_uninit(&tr->tr_t_gh); | |
117 | kfree(tr); | |
118 | } | |
b3b94faa DT |
119 | return; |
120 | } | |
121 | ||
c50b91c4 SW |
122 | nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; |
123 | nbuf -= tr->tr_num_buf_rm; | |
124 | nbuf -= tr->tr_num_databuf_rm; | |
125 | ||
126 | if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && | |
127 | (tr->tr_num_revoke <= tr->tr_revokes))) | |
128 | gfs2_print_trans(tr); | |
b3b94faa DT |
129 | |
130 | gfs2_log_commit(sdp, tr); | |
d8348de0 SW |
131 | if (tr->tr_t_gh.gh_gl) { |
132 | gfs2_glock_dq(&tr->tr_t_gh); | |
133 | gfs2_holder_uninit(&tr->tr_t_gh); | |
134 | kfree(tr); | |
135 | } | |
b3b94faa DT |
136 | |
137 | if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) | |
b09e593d | 138 | gfs2_log_flush(sdp, NULL); |
b3b94faa DT |
139 | } |
140 | ||
b3b94faa DT |
141 | /** |
142 | * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction | |
143 | * @gl: the glock the buffer belongs to | |
144 | * @bh: The buffer to add | |
d4e9c4c3 | 145 | * @meta: True in the case of adding metadata |
b3b94faa DT |
146 | * |
147 | */ | |
148 | ||
d4e9c4c3 | 149 | void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) |
b3b94faa DT |
150 | { |
151 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
152 | struct gfs2_bufdata *bd; | |
153 | ||
5c676f6d | 154 | bd = bh->b_private; |
b3b94faa DT |
155 | if (bd) |
156 | gfs2_assert(sdp, bd->bd_gl == gl); | |
157 | else { | |
586dfdaa | 158 | gfs2_attach_bufdata(gl, bh, meta); |
5c676f6d | 159 | bd = bh->b_private; |
b3b94faa | 160 | } |
c0752aa7 | 161 | lops_add(sdp, bd); |
b3b94faa DT |
162 | } |
163 | ||
1ad38c43 | 164 | void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) |
b3b94faa | 165 | { |
c0752aa7 | 166 | BUG_ON(!list_empty(&bd->bd_list)); |
1ad38c43 SW |
167 | BUG_ON(!list_empty(&bd->bd_ail_st_list)); |
168 | BUG_ON(!list_empty(&bd->bd_ail_gl_list)); | |
c0752aa7 BP |
169 | lops_init_le(bd, &gfs2_revoke_lops); |
170 | lops_add(sdp, bd); | |
b3b94faa DT |
171 | } |
172 | ||
5731be53 | 173 | void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) |
b3b94faa | 174 | { |
5731be53 SW |
175 | struct gfs2_bufdata *bd, *tmp; |
176 | struct gfs2_trans *tr = current->journal_info; | |
177 | unsigned int n = len; | |
b3b94faa DT |
178 | |
179 | gfs2_log_lock(sdp); | |
c0752aa7 | 180 | list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { |
5731be53 | 181 | if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { |
c0752aa7 | 182 | list_del_init(&bd->bd_list); |
b3b94faa DT |
183 | gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); |
184 | sdp->sd_log_num_revoke--; | |
5731be53 SW |
185 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
186 | tr->tr_num_revoke_rm++; | |
187 | if (--n == 0) | |
188 | break; | |
b3b94faa DT |
189 | } |
190 | } | |
b3b94faa | 191 | gfs2_log_unlock(sdp); |
b3b94faa DT |
192 | } |
193 |