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Commit | Line | Data |
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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 | ||
d77d1b58 JP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
b3b94faa DT |
12 | #include <linux/sched.h> |
13 | #include <linux/slab.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/completion.h> | |
16 | #include <linux/buffer_head.h> | |
d0dc80db | 17 | #include <linux/kallsyms.h> |
f057f6cd | 18 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
19 | |
20 | #include "gfs2.h" | |
5c676f6d | 21 | #include "incore.h" |
b3b94faa | 22 | #include "glock.h" |
767f433f | 23 | #include "inode.h" |
b3b94faa DT |
24 | #include "log.h" |
25 | #include "lops.h" | |
26 | #include "meta_io.h" | |
27 | #include "trans.h" | |
5c676f6d | 28 | #include "util.h" |
5e687eac | 29 | #include "trace_gfs2.h" |
b3b94faa | 30 | |
d0dc80db SW |
31 | int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, |
32 | unsigned int revokes) | |
b3b94faa DT |
33 | { |
34 | struct gfs2_trans *tr; | |
35 | int error; | |
36 | ||
d0dc80db SW |
37 | BUG_ON(current->journal_info); |
38 | BUG_ON(blocks == 0 && revokes == 0); | |
b3b94faa | 39 | |
a1c0643f SW |
40 | if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) |
41 | return -EROFS; | |
42 | ||
f55ab26a | 43 | tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); |
b3b94faa DT |
44 | if (!tr) |
45 | return -ENOMEM; | |
46 | ||
d0dc80db | 47 | tr->tr_ip = (unsigned long)__builtin_return_address(0); |
b3b94faa DT |
48 | tr->tr_blocks = blocks; |
49 | tr->tr_revokes = revokes; | |
50 | tr->tr_reserved = 1; | |
24972557 | 51 | tr->tr_alloced = 1; |
b3b94faa | 52 | if (blocks) |
f4154ea0 | 53 | tr->tr_reserved += 6 + blocks; |
b3b94faa DT |
54 | if (revokes) |
55 | tr->tr_reserved += gfs2_struct2blk(sdp, revokes, | |
cd915493 | 56 | sizeof(u64)); |
d69a3c65 SW |
57 | INIT_LIST_HEAD(&tr->tr_databuf); |
58 | INIT_LIST_HEAD(&tr->tr_buf); | |
59 | ||
39263d5e | 60 | sb_start_intwrite(sdp->sd_vfs); |
b3b94faa | 61 | |
b3b94faa DT |
62 | error = gfs2_log_reserve(sdp, tr->tr_reserved); |
63 | if (error) | |
24972557 | 64 | goto fail; |
b3b94faa | 65 | |
5c676f6d | 66 | current->journal_info = tr; |
b3b94faa DT |
67 | |
68 | return 0; | |
69 | ||
24972557 | 70 | fail: |
39263d5e | 71 | sb_end_intwrite(sdp->sd_vfs); |
b3b94faa DT |
72 | kfree(tr); |
73 | ||
74 | return error; | |
75 | } | |
76 | ||
c50b91c4 SW |
77 | static void gfs2_print_trans(const struct gfs2_trans *tr) |
78 | { | |
d77d1b58 JP |
79 | pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip); |
80 | pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n", | |
81 | tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched); | |
82 | pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n", | |
83 | tr->tr_num_buf_new, tr->tr_num_buf_rm, | |
84 | tr->tr_num_databuf_new, tr->tr_num_databuf_rm, | |
85 | tr->tr_num_revoke, tr->tr_num_revoke_rm); | |
c50b91c4 SW |
86 | } |
87 | ||
b3b94faa DT |
88 | void gfs2_trans_end(struct gfs2_sbd *sdp) |
89 | { | |
f4154ea0 | 90 | struct gfs2_trans *tr = current->journal_info; |
c50b91c4 | 91 | s64 nbuf; |
f4154ea0 | 92 | BUG_ON(!tr); |
5c676f6d | 93 | current->journal_info = NULL; |
b3b94faa | 94 | |
b3b94faa DT |
95 | if (!tr->tr_touched) { |
96 | gfs2_log_release(sdp, tr->tr_reserved); | |
24972557 | 97 | if (tr->tr_alloced) |
d8348de0 | 98 | kfree(tr); |
39263d5e | 99 | sb_end_intwrite(sdp->sd_vfs); |
b3b94faa DT |
100 | return; |
101 | } | |
102 | ||
c50b91c4 SW |
103 | nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; |
104 | nbuf -= tr->tr_num_buf_rm; | |
105 | nbuf -= tr->tr_num_databuf_rm; | |
106 | ||
107 | if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && | |
108 | (tr->tr_num_revoke <= tr->tr_revokes))) | |
109 | gfs2_print_trans(tr); | |
b3b94faa DT |
110 | |
111 | gfs2_log_commit(sdp, tr); | |
24972557 | 112 | if (tr->tr_alloced && !tr->tr_attached) |
16ca9412 | 113 | kfree(tr); |
16ca9412 | 114 | up_read(&sdp->sd_log_flush_lock); |
b3b94faa DT |
115 | |
116 | if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) | |
24972557 | 117 | gfs2_log_flush(sdp, NULL, NORMAL_FLUSH); |
39263d5e | 118 | sb_end_intwrite(sdp->sd_vfs); |
b3b94faa DT |
119 | } |
120 | ||
c76c4d96 SW |
121 | static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, |
122 | struct buffer_head *bh, | |
123 | const struct gfs2_log_operations *lops) | |
124 | { | |
125 | struct gfs2_bufdata *bd; | |
126 | ||
127 | bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); | |
128 | bd->bd_bh = bh; | |
129 | bd->bd_gl = gl; | |
130 | bd->bd_ops = lops; | |
131 | INIT_LIST_HEAD(&bd->bd_list); | |
132 | bh->b_private = bd; | |
133 | return bd; | |
134 | } | |
135 | ||
b3b94faa | 136 | /** |
45138990 SW |
137 | * gfs2_trans_add_data - Add a databuf to the transaction. |
138 | * @gl: The inode glock associated with the buffer | |
139 | * @bh: The buffer to add | |
b3b94faa | 140 | * |
767f433f SW |
141 | * This is used in two distinct cases: |
142 | * i) In ordered write mode | |
143 | * We put the data buffer on a list so that we can ensure that its | |
144 | * synced to disk at the right time | |
145 | * ii) In journaled data mode | |
146 | * We need to journal the data block in the same way as metadata in | |
147 | * the functions above. The difference is that here we have a tag | |
148 | * which is two __be64's being the block number (as per meta data) | |
149 | * and a flag which says whether the data block needs escaping or | |
150 | * not. This means we need a new log entry for each 251 or so data | |
151 | * blocks, which isn't an enormous overhead but twice as much as | |
152 | * for normal metadata blocks. | |
b3b94faa | 153 | */ |
45138990 | 154 | void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) |
767f433f SW |
155 | { |
156 | struct gfs2_trans *tr = current->journal_info; | |
45138990 SW |
157 | struct gfs2_sbd *sdp = gl->gl_sbd; |
158 | struct address_space *mapping = bh->b_page->mapping; | |
767f433f | 159 | struct gfs2_inode *ip = GFS2_I(mapping->host); |
45138990 | 160 | struct gfs2_bufdata *bd; |
767f433f | 161 | |
45138990 SW |
162 | if (!gfs2_is_jdata(ip)) { |
163 | gfs2_ordered_add_inode(ip); | |
767f433f | 164 | return; |
767f433f | 165 | } |
b3b94faa | 166 | |
96e5d1d3 BM |
167 | lock_buffer(bh); |
168 | gfs2_log_lock(sdp); | |
5c676f6d | 169 | bd = bh->b_private; |
c76c4d96 | 170 | if (bd == NULL) { |
96e5d1d3 BM |
171 | gfs2_log_unlock(sdp); |
172 | unlock_buffer(bh); | |
c76c4d96 SW |
173 | if (bh->b_private == NULL) |
174 | bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops); | |
96e5d1d3 BM |
175 | lock_buffer(bh); |
176 | gfs2_log_lock(sdp); | |
b3b94faa | 177 | } |
c76c4d96 | 178 | gfs2_assert(sdp, bd->bd_gl == gl); |
45138990 SW |
179 | tr->tr_touched = 1; |
180 | if (list_empty(&bd->bd_list)) { | |
181 | set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); | |
182 | set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); | |
183 | gfs2_pin(sdp, bd->bd_bh); | |
184 | tr->tr_num_databuf_new++; | |
d69a3c65 | 185 | list_add_tail(&bd->bd_list, &tr->tr_databuf); |
45138990 | 186 | } |
96e5d1d3 BM |
187 | gfs2_log_unlock(sdp); |
188 | unlock_buffer(bh); | |
b3b94faa DT |
189 | } |
190 | ||
767f433f | 191 | static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) |
350a9b0a | 192 | { |
767f433f SW |
193 | struct gfs2_meta_header *mh; |
194 | struct gfs2_trans *tr; | |
195 | ||
196 | tr = current->journal_info; | |
197 | tr->tr_touched = 1; | |
198 | if (!list_empty(&bd->bd_list)) | |
199 | return; | |
200 | set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); | |
201 | set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); | |
202 | mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; | |
203 | if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { | |
d77d1b58 | 204 | pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n", |
767f433f SW |
205 | (unsigned long long)bd->bd_bh->b_blocknr); |
206 | BUG(); | |
207 | } | |
208 | gfs2_pin(sdp, bd->bd_bh); | |
209 | mh->__pad0 = cpu_to_be64(0); | |
210 | mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); | |
d69a3c65 | 211 | list_add(&bd->bd_list, &tr->tr_buf); |
767f433f | 212 | tr->tr_num_buf_new++; |
350a9b0a SW |
213 | } |
214 | ||
215 | void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) | |
216 | { | |
767f433f SW |
217 | |
218 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
219 | struct gfs2_bufdata *bd; | |
220 | ||
221 | lock_buffer(bh); | |
222 | gfs2_log_lock(sdp); | |
223 | bd = bh->b_private; | |
c76c4d96 | 224 | if (bd == NULL) { |
767f433f SW |
225 | gfs2_log_unlock(sdp); |
226 | unlock_buffer(bh); | |
c76c4d96 SW |
227 | lock_page(bh->b_page); |
228 | if (bh->b_private == NULL) | |
229 | bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops); | |
230 | unlock_page(bh->b_page); | |
767f433f SW |
231 | lock_buffer(bh); |
232 | gfs2_log_lock(sdp); | |
233 | } | |
c76c4d96 | 234 | gfs2_assert(sdp, bd->bd_gl == gl); |
767f433f SW |
235 | meta_lo_add(sdp, bd); |
236 | gfs2_log_unlock(sdp); | |
237 | unlock_buffer(bh); | |
350a9b0a SW |
238 | } |
239 | ||
1ad38c43 | 240 | void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) |
b3b94faa | 241 | { |
75f2b879 SW |
242 | struct gfs2_trans *tr = current->journal_info; |
243 | ||
c0752aa7 | 244 | BUG_ON(!list_empty(&bd->bd_list)); |
5d054964 | 245 | gfs2_add_revoke(sdp, bd); |
75f2b879 SW |
246 | tr->tr_touched = 1; |
247 | tr->tr_num_revoke++; | |
b3b94faa DT |
248 | } |
249 | ||
5731be53 | 250 | void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) |
b3b94faa | 251 | { |
5731be53 SW |
252 | struct gfs2_bufdata *bd, *tmp; |
253 | struct gfs2_trans *tr = current->journal_info; | |
254 | unsigned int n = len; | |
b3b94faa DT |
255 | |
256 | gfs2_log_lock(sdp); | |
c0752aa7 | 257 | list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { |
5731be53 | 258 | if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { |
c0752aa7 | 259 | list_del_init(&bd->bd_list); |
b3b94faa DT |
260 | gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); |
261 | sdp->sd_log_num_revoke--; | |
5731be53 SW |
262 | kmem_cache_free(gfs2_bufdata_cachep, bd); |
263 | tr->tr_num_revoke_rm++; | |
264 | if (--n == 0) | |
265 | break; | |
b3b94faa DT |
266 | } |
267 | } | |
b3b94faa | 268 | gfs2_log_unlock(sdp); |
b3b94faa DT |
269 | } |
270 |