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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8984d137 AM |
2 | /* |
3 | * Interface between ext4 and JBD | |
4 | */ | |
5 | ||
3dcf5451 | 6 | #include "ext4_jbd2.h" |
8984d137 | 7 | |
d6797d14 TT |
8 | #include <trace/events/ext4.h> |
9 | ||
46797ad7 EB |
10 | int ext4_inode_journal_mode(struct inode *inode) |
11 | { | |
12 | if (EXT4_JOURNAL(inode) == NULL) | |
13 | return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ | |
14 | /* We do not support data journalling with delayed allocation */ | |
15 | if (!S_ISREG(inode->i_mode) || | |
16 | ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE) || | |
17 | test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA || | |
18 | (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) && | |
19 | !test_opt(inode->i_sb, DELALLOC))) { | |
20 | /* We do not support data journalling for encrypted data */ | |
21 | if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode)) | |
22 | return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */ | |
23 | return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */ | |
24 | } | |
25 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) | |
26 | return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */ | |
27 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) | |
28 | return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */ | |
29 | BUG(); | |
30 | } | |
31 | ||
722887dd TT |
32 | /* Just increment the non-pointer handle value */ |
33 | static handle_t *ext4_get_nojournal(void) | |
34 | { | |
35 | handle_t *handle = current->journal_info; | |
36 | unsigned long ref_cnt = (unsigned long)handle; | |
37 | ||
38 | BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); | |
39 | ||
40 | ref_cnt++; | |
41 | handle = (handle_t *)ref_cnt; | |
42 | ||
43 | current->journal_info = handle; | |
44 | return handle; | |
45 | } | |
46 | ||
47 | ||
48 | /* Decrement the non-pointer handle value */ | |
49 | static void ext4_put_nojournal(handle_t *handle) | |
50 | { | |
51 | unsigned long ref_cnt = (unsigned long)handle; | |
52 | ||
53 | BUG_ON(ref_cnt == 0); | |
54 | ||
55 | ref_cnt--; | |
56 | handle = (handle_t *)ref_cnt; | |
57 | ||
58 | current->journal_info = handle; | |
59 | } | |
60 | ||
61 | /* | |
62 | * Wrappers for jbd2_journal_start/end. | |
63 | */ | |
5fe2fe89 | 64 | static int ext4_journal_check_start(struct super_block *sb) |
722887dd TT |
65 | { |
66 | journal_t *journal; | |
67 | ||
b10a44c3 | 68 | might_sleep(); |
0db1ff22 TT |
69 | |
70 | if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) | |
71 | return -EIO; | |
72 | ||
bc98a42c | 73 | if (sb_rdonly(sb)) |
5fe2fe89 | 74 | return -EROFS; |
722887dd TT |
75 | WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); |
76 | journal = EXT4_SB(sb)->s_journal; | |
722887dd TT |
77 | /* |
78 | * Special case here: if the journal has aborted behind our | |
79 | * backs (eg. EIO in the commit thread), then we still need to | |
80 | * take the FS itself readonly cleanly. | |
81 | */ | |
5fe2fe89 | 82 | if (journal && is_journal_aborted(journal)) { |
54d3adbc | 83 | ext4_abort(sb, -journal->j_errno, "Detected aborted journal"); |
5fe2fe89 | 84 | return -EROFS; |
722887dd | 85 | } |
5fe2fe89 JK |
86 | return 0; |
87 | } | |
88 | ||
89 | handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line, | |
83448bdf JK |
90 | int type, int blocks, int rsv_blocks, |
91 | int revoke_creds) | |
5fe2fe89 JK |
92 | { |
93 | journal_t *journal; | |
94 | int err; | |
95 | ||
83448bdf JK |
96 | trace_ext4_journal_start(sb, blocks, rsv_blocks, revoke_creds, |
97 | _RET_IP_); | |
5fe2fe89 JK |
98 | err = ext4_journal_check_start(sb); |
99 | if (err < 0) | |
100 | return ERR_PTR(err); | |
101 | ||
102 | journal = EXT4_SB(sb)->s_journal; | |
8016e29f | 103 | if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY)) |
5fe2fe89 | 104 | return ext4_get_nojournal(); |
83448bdf JK |
105 | return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds, |
106 | GFP_NOFS, type, line); | |
722887dd TT |
107 | } |
108 | ||
109 | int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) | |
110 | { | |
111 | struct super_block *sb; | |
112 | int err; | |
113 | int rc; | |
114 | ||
115 | if (!ext4_handle_valid(handle)) { | |
116 | ext4_put_nojournal(handle); | |
117 | return 0; | |
118 | } | |
9d506594 | 119 | |
6934da92 | 120 | err = handle->h_err; |
9d506594 | 121 | if (!handle->h_transaction) { |
6934da92 LC |
122 | rc = jbd2_journal_stop(handle); |
123 | return err ? err : rc; | |
9d506594 LC |
124 | } |
125 | ||
722887dd | 126 | sb = handle->h_transaction->t_journal->j_private; |
722887dd TT |
127 | rc = jbd2_journal_stop(handle); |
128 | ||
129 | if (!err) | |
130 | err = rc; | |
131 | if (err) | |
132 | __ext4_std_error(sb, where, line, err); | |
133 | return err; | |
134 | } | |
135 | ||
5fe2fe89 JK |
136 | handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line, |
137 | int type) | |
138 | { | |
139 | struct super_block *sb; | |
140 | int err; | |
141 | ||
142 | if (!ext4_handle_valid(handle)) | |
143 | return ext4_get_nojournal(); | |
144 | ||
145 | sb = handle->h_journal->j_private; | |
a9a8344e JK |
146 | trace_ext4_journal_start_reserved(sb, |
147 | jbd2_handle_buffer_credits(handle), _RET_IP_); | |
5fe2fe89 JK |
148 | err = ext4_journal_check_start(sb); |
149 | if (err < 0) { | |
150 | jbd2_journal_free_reserved(handle); | |
151 | return ERR_PTR(err); | |
152 | } | |
153 | ||
154 | err = jbd2_journal_start_reserved(handle, type, line); | |
155 | if (err < 0) | |
156 | return ERR_PTR(err); | |
157 | return handle; | |
158 | } | |
159 | ||
a4130367 | 160 | int __ext4_journal_ensure_credits(handle_t *handle, int check_cred, |
83448bdf | 161 | int extend_cred, int revoke_cred) |
a4130367 JK |
162 | { |
163 | if (!ext4_handle_valid(handle)) | |
164 | return 0; | |
f8db10c0 YB |
165 | if (is_handle_aborted(handle)) |
166 | return -EROFS; | |
83448bdf JK |
167 | if (jbd2_handle_buffer_credits(handle) >= check_cred && |
168 | handle->h_revoke_credits >= revoke_cred) | |
a4130367 | 169 | return 0; |
83448bdf JK |
170 | extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle)); |
171 | revoke_cred = max(0, revoke_cred - handle->h_revoke_credits); | |
172 | return ext4_journal_extend(handle, extend_cred, revoke_cred); | |
a4130367 JK |
173 | } |
174 | ||
c197855e SH |
175 | static void ext4_journal_abort_handle(const char *caller, unsigned int line, |
176 | const char *err_fn, | |
177 | struct buffer_head *bh, | |
178 | handle_t *handle, int err) | |
722887dd TT |
179 | { |
180 | char nbuf[16]; | |
181 | const char *errstr = ext4_decode_error(NULL, err, nbuf); | |
182 | ||
183 | BUG_ON(!ext4_handle_valid(handle)); | |
184 | ||
185 | if (bh) | |
186 | BUFFER_TRACE(bh, "abort"); | |
187 | ||
188 | if (!handle->h_err) | |
189 | handle->h_err = err; | |
190 | ||
191 | if (is_handle_aborted(handle)) | |
192 | return; | |
193 | ||
194 | printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n", | |
195 | caller, line, errstr, err_fn); | |
196 | ||
197 | jbd2_journal_abort_handle(handle); | |
198 | } | |
199 | ||
bc71726c | 200 | static void ext4_check_bdev_write_error(struct super_block *sb) |
201 | { | |
202 | struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping; | |
203 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
204 | int err; | |
205 | ||
206 | /* | |
207 | * If the block device has write error flag, it may have failed to | |
208 | * async write out metadata buffers in the background. In this case, | |
209 | * we could read old data from disk and write it out again, which | |
210 | * may lead to on-disk filesystem inconsistency. | |
211 | */ | |
212 | if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) { | |
213 | spin_lock(&sbi->s_bdev_wb_lock); | |
214 | err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err); | |
215 | spin_unlock(&sbi->s_bdev_wb_lock); | |
216 | if (err) | |
217 | ext4_error_err(sb, -err, | |
218 | "Error while async write back metadata"); | |
219 | } | |
220 | } | |
221 | ||
90c7201b | 222 | int __ext4_journal_get_write_access(const char *where, unsigned int line, |
188c299e JK |
223 | handle_t *handle, struct super_block *sb, |
224 | struct buffer_head *bh, | |
225 | enum ext4_journal_trigger_type trigger_type) | |
8984d137 | 226 | { |
188c299e | 227 | int err; |
0390131b | 228 | |
b10a44c3 TT |
229 | might_sleep(); |
230 | ||
bc71726c | 231 | if (bh->b_bdev->bd_super) |
232 | ext4_check_bdev_write_error(bh->b_bdev->bd_super); | |
233 | ||
0390131b FM |
234 | if (ext4_handle_valid(handle)) { |
235 | err = jbd2_journal_get_write_access(handle, bh); | |
188c299e | 236 | if (err) { |
90c7201b | 237 | ext4_journal_abort_handle(where, line, __func__, bh, |
0390131b | 238 | handle, err); |
188c299e JK |
239 | return err; |
240 | } | |
0390131b | 241 | } |
188c299e JK |
242 | if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb)) |
243 | return 0; | |
244 | BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT); | |
245 | jbd2_journal_set_triggers(bh, | |
246 | &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers); | |
247 | return 0; | |
8984d137 AM |
248 | } |
249 | ||
d6797d14 TT |
250 | /* |
251 | * The ext4 forget function must perform a revoke if we are freeing data | |
252 | * which has been journaled. Metadata (eg. indirect blocks) must be | |
253 | * revoked in all cases. | |
254 | * | |
255 | * "bh" may be NULL: a metadata block may have been freed from memory | |
256 | * but there may still be a record of it in the journal, and that record | |
257 | * still needs to be revoked. | |
d6797d14 | 258 | */ |
90c7201b TT |
259 | int __ext4_forget(const char *where, unsigned int line, handle_t *handle, |
260 | int is_metadata, struct inode *inode, | |
261 | struct buffer_head *bh, ext4_fsblk_t blocknr) | |
d6797d14 TT |
262 | { |
263 | int err; | |
264 | ||
265 | might_sleep(); | |
266 | ||
267 | trace_ext4_forget(inode, is_metadata, blocknr); | |
268 | BUFFER_TRACE(bh, "enter"); | |
269 | ||
270 | jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, " | |
271 | "data mode %x\n", | |
272 | bh, is_metadata, inode->i_mode, | |
273 | test_opt(inode->i_sb, DATA_FLAGS)); | |
274 | ||
e4684b3f TT |
275 | /* In the no journal case, we can just do a bforget and return */ |
276 | if (!ext4_handle_valid(handle)) { | |
277 | bforget(bh); | |
278 | return 0; | |
279 | } | |
280 | ||
d6797d14 TT |
281 | /* Never use the revoke function if we are doing full data |
282 | * journaling: there is no need to, and a V1 superblock won't | |
283 | * support it. Otherwise, only skip the revoke on un-journaled | |
284 | * data blocks. */ | |
285 | ||
286 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA || | |
287 | (!is_metadata && !ext4_should_journal_data(inode))) { | |
288 | if (bh) { | |
289 | BUFFER_TRACE(bh, "call jbd2_journal_forget"); | |
b7e57e7c TT |
290 | err = jbd2_journal_forget(handle, bh); |
291 | if (err) | |
90c7201b TT |
292 | ext4_journal_abort_handle(where, line, __func__, |
293 | bh, handle, err); | |
b7e57e7c | 294 | return err; |
d6797d14 TT |
295 | } |
296 | return 0; | |
297 | } | |
298 | ||
299 | /* | |
300 | * data!=journal && (is_metadata || should_journal_data(inode)) | |
301 | */ | |
e4684b3f TT |
302 | BUFFER_TRACE(bh, "call jbd2_journal_revoke"); |
303 | err = jbd2_journal_revoke(handle, blocknr, bh); | |
304 | if (err) { | |
90c7201b TT |
305 | ext4_journal_abort_handle(where, line, __func__, |
306 | bh, handle, err); | |
014c9caa JK |
307 | __ext4_error(inode->i_sb, where, line, true, -err, 0, |
308 | "error %d when attempting revoke", err); | |
e4684b3f | 309 | } |
d6797d14 TT |
310 | BUFFER_TRACE(bh, "exit"); |
311 | return err; | |
312 | } | |
313 | ||
90c7201b | 314 | int __ext4_journal_get_create_access(const char *where, unsigned int line, |
188c299e JK |
315 | handle_t *handle, struct super_block *sb, |
316 | struct buffer_head *bh, | |
317 | enum ext4_journal_trigger_type trigger_type) | |
8984d137 | 318 | { |
188c299e | 319 | int err; |
0390131b | 320 | |
188c299e JK |
321 | if (!ext4_handle_valid(handle)) |
322 | return 0; | |
323 | ||
324 | err = jbd2_journal_get_create_access(handle, bh); | |
325 | if (err) { | |
326 | ext4_journal_abort_handle(where, line, __func__, bh, handle, | |
327 | err); | |
328 | return err; | |
0390131b | 329 | } |
188c299e JK |
330 | if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb)) |
331 | return 0; | |
332 | BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT); | |
333 | jbd2_journal_set_triggers(bh, | |
334 | &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers); | |
335 | return 0; | |
8984d137 AM |
336 | } |
337 | ||
90c7201b TT |
338 | int __ext4_handle_dirty_metadata(const char *where, unsigned int line, |
339 | handle_t *handle, struct inode *inode, | |
340 | struct buffer_head *bh) | |
8984d137 | 341 | { |
0390131b FM |
342 | int err = 0; |
343 | ||
b10a44c3 TT |
344 | might_sleep(); |
345 | ||
13fca323 TT |
346 | set_buffer_meta(bh); |
347 | set_buffer_prio(bh); | |
558d6450 | 348 | set_buffer_uptodate(bh); |
0390131b FM |
349 | if (ext4_handle_valid(handle)) { |
350 | err = jbd2_journal_dirty_metadata(handle, bh); | |
c5d31192 DM |
351 | /* Errors can only happen due to aborted journal or a nasty bug */ |
352 | if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) { | |
91aa11fa JK |
353 | ext4_journal_abort_handle(where, line, __func__, bh, |
354 | handle, err); | |
66a4cb18 TT |
355 | if (inode == NULL) { |
356 | pr_err("EXT4: jbd2_journal_dirty_metadata " | |
357 | "failed: handle type %u started at " | |
358 | "line %u, credits %u/%u, errcode %d", | |
359 | handle->h_type, | |
360 | handle->h_line_no, | |
361 | handle->h_requested_credits, | |
a9a8344e | 362 | jbd2_handle_buffer_credits(handle), err); |
66a4cb18 TT |
363 | return err; |
364 | } | |
ae1495b1 TT |
365 | ext4_error_inode(inode, where, line, |
366 | bh->b_blocknr, | |
367 | "journal_dirty_metadata failed: " | |
368 | "handle type %u started at line %u, " | |
369 | "credits %u/%u, errcode %d", | |
370 | handle->h_type, | |
371 | handle->h_line_no, | |
372 | handle->h_requested_credits, | |
a9a8344e JK |
373 | jbd2_handle_buffer_credits(handle), |
374 | err); | |
9ea7a0df | 375 | } |
0390131b | 376 | } else { |
73b50c1c | 377 | if (inode) |
fe188c0e TT |
378 | mark_buffer_dirty_inode(bh, inode); |
379 | else | |
380 | mark_buffer_dirty(bh); | |
0390131b FM |
381 | if (inode && inode_needs_sync(inode)) { |
382 | sync_dirty_buffer(bh); | |
383 | if (buffer_req(bh) && !buffer_uptodate(bh)) { | |
54d3adbc TT |
384 | ext4_error_inode_err(inode, where, line, |
385 | bh->b_blocknr, EIO, | |
c398eda0 | 386 | "IO error syncing itable block"); |
0390131b FM |
387 | err = -EIO; |
388 | } | |
389 | } | |
390 | } | |
8984d137 AM |
391 | return err; |
392 | } |