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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Andrew Morton8984d132006-12-06 20:37:15 -08002/*
3 * Interface between ext4 and JBD
4 */
5
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04006#include "ext4_jbd2.h"
Andrew Morton8984d132006-12-06 20:37:15 -08007
Theodore Ts'od6797d12009-11-22 20:52:12 -05008#include <trace/events/ext4.h>
9
Eric Biggers46797ad2019-12-09 15:36:02 -080010int 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
Theodore Ts'o722887d2013-02-08 13:00:31 -050032/* Just increment the non-pointer handle value */
33static 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 */
49static 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 */
Jan Kara5fe2fe82013-06-04 12:37:50 -040064static int ext4_journal_check_start(struct super_block *sb)
Theodore Ts'o722887d2013-02-08 13:00:31 -050065{
66 journal_t *journal;
67
Theodore Ts'ob10a44c2013-04-03 22:00:52 -040068 might_sleep();
Theodore Ts'o0db1ff22017-02-05 01:28:48 -050069
Jan Karaeb8ab442023-06-16 18:50:49 +020070 if (unlikely(ext4_forced_shutdown(sb)))
Theodore Ts'o0db1ff22017-02-05 01:28:48 -050071 return -EIO;
72
Jan Karae7fc2b32023-06-16 18:50:53 +020073 if (WARN_ON_ONCE(sb_rdonly(sb)))
Jan Kara5fe2fe82013-06-04 12:37:50 -040074 return -EROFS;
Jan Karae7fc2b32023-06-16 18:50:53 +020075
Theodore Ts'o722887d2013-02-08 13:00:31 -050076 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
77 journal = EXT4_SB(sb)->s_journal;
Theodore Ts'o722887d2013-02-08 13:00:31 -050078 /*
79 * Special case here: if the journal has aborted behind our
80 * backs (eg. EIO in the commit thread), then we still need to
81 * take the FS itself readonly cleanly.
82 */
Jan Kara5fe2fe82013-06-04 12:37:50 -040083 if (journal && is_journal_aborted(journal)) {
Theodore Ts'o54d3adb2020-03-28 19:33:43 -040084 ext4_abort(sb, -journal->j_errno, "Detected aborted journal");
Jan Kara5fe2fe82013-06-04 12:37:50 -040085 return -EROFS;
Theodore Ts'o722887d2013-02-08 13:00:31 -050086 }
Jan Kara5fe2fe82013-06-04 12:37:50 -040087 return 0;
88}
89
changfengnan5f3e2402022-10-08 20:05:18 +080090handle_t *__ext4_journal_start_sb(struct inode *inode,
91 struct super_block *sb, unsigned int line,
Jan Kara83448bd2019-11-05 17:44:29 +010092 int type, int blocks, int rsv_blocks,
93 int revoke_creds)
Jan Kara5fe2fe82013-06-04 12:37:50 -040094{
95 journal_t *journal;
96 int err;
changfengnan5f3e2402022-10-08 20:05:18 +080097 if (inode)
98 trace_ext4_journal_start_inode(inode, blocks, rsv_blocks,
99 revoke_creds, type,
100 _RET_IP_);
101 else
102 trace_ext4_journal_start_sb(sb, blocks, rsv_blocks,
103 revoke_creds, type,
104 _RET_IP_);
Jan Kara5fe2fe82013-06-04 12:37:50 -0400105 err = ext4_journal_check_start(sb);
106 if (err < 0)
107 return ERR_PTR(err);
108
109 journal = EXT4_SB(sb)->s_journal;
Harshad Shirwadkar8016e292020-10-15 13:37:59 -0700110 if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
Jan Kara5fe2fe82013-06-04 12:37:50 -0400111 return ext4_get_nojournal();
Jan Kara83448bd2019-11-05 17:44:29 +0100112 return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds,
113 GFP_NOFS, type, line);
Theodore Ts'o722887d2013-02-08 13:00:31 -0500114}
115
116int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
117{
118 struct super_block *sb;
119 int err;
120 int rc;
121
122 if (!ext4_handle_valid(handle)) {
123 ext4_put_nojournal(handle);
124 return 0;
125 }
Lukas Czerner9d506592015-05-14 18:55:18 -0400126
Lukas Czerner6934da92015-10-17 22:57:06 -0400127 err = handle->h_err;
Lukas Czerner9d506592015-05-14 18:55:18 -0400128 if (!handle->h_transaction) {
Lukas Czerner6934da92015-10-17 22:57:06 -0400129 rc = jbd2_journal_stop(handle);
130 return err ? err : rc;
Lukas Czerner9d506592015-05-14 18:55:18 -0400131 }
132
Theodore Ts'o722887d2013-02-08 13:00:31 -0500133 sb = handle->h_transaction->t_journal->j_private;
Theodore Ts'o722887d2013-02-08 13:00:31 -0500134 rc = jbd2_journal_stop(handle);
135
136 if (!err)
137 err = rc;
138 if (err)
139 __ext4_std_error(sb, where, line, err);
140 return err;
141}
142
Jan Kara5fe2fe82013-06-04 12:37:50 -0400143handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
144 int type)
145{
146 struct super_block *sb;
147 int err;
148
149 if (!ext4_handle_valid(handle))
150 return ext4_get_nojournal();
151
152 sb = handle->h_journal->j_private;
Jan Karaa9a83442019-11-05 17:44:17 +0100153 trace_ext4_journal_start_reserved(sb,
154 jbd2_handle_buffer_credits(handle), _RET_IP_);
Jan Kara5fe2fe82013-06-04 12:37:50 -0400155 err = ext4_journal_check_start(sb);
156 if (err < 0) {
157 jbd2_journal_free_reserved(handle);
158 return ERR_PTR(err);
159 }
160
161 err = jbd2_journal_start_reserved(handle, type, line);
162 if (err < 0)
163 return ERR_PTR(err);
164 return handle;
165}
166
Jan Karaa4130362019-11-05 17:44:16 +0100167int __ext4_journal_ensure_credits(handle_t *handle, int check_cred,
Jan Kara83448bd2019-11-05 17:44:29 +0100168 int extend_cred, int revoke_cred)
Jan Karaa4130362019-11-05 17:44:16 +0100169{
170 if (!ext4_handle_valid(handle))
171 return 0;
Ye Bin298b5c52021-12-24 18:03:41 +0800172 if (is_handle_aborted(handle))
173 return -EROFS;
Jan Kara83448bd2019-11-05 17:44:29 +0100174 if (jbd2_handle_buffer_credits(handle) >= check_cred &&
175 handle->h_revoke_credits >= revoke_cred)
Jan Karaa4130362019-11-05 17:44:16 +0100176 return 0;
Jan Kara83448bd2019-11-05 17:44:29 +0100177 extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle));
178 revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);
179 return ext4_journal_extend(handle, extend_cred, revoke_cred);
Jan Karaa4130362019-11-05 17:44:16 +0100180}
181
Stephen Hemmingerc1978552014-05-12 10:50:23 -0400182static void ext4_journal_abort_handle(const char *caller, unsigned int line,
183 const char *err_fn,
184 struct buffer_head *bh,
185 handle_t *handle, int err)
Theodore Ts'o722887d2013-02-08 13:00:31 -0500186{
187 char nbuf[16];
188 const char *errstr = ext4_decode_error(NULL, err, nbuf);
189
190 BUG_ON(!ext4_handle_valid(handle));
191
192 if (bh)
193 BUFFER_TRACE(bh, "abort");
194
195 if (!handle->h_err)
196 handle->h_err = err;
197
198 if (is_handle_aborted(handle))
199 return;
200
201 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
202 caller, line, errstr, err_fn);
203
204 jbd2_journal_abort_handle(handle);
205}
206
zhangyi (F)bc717262020-06-20 10:54:23 +0800207static void ext4_check_bdev_write_error(struct super_block *sb)
208{
Al Viro224941e2024-04-11 15:53:37 +0100209 struct address_space *mapping = sb->s_bdev->bd_mapping;
zhangyi (F)bc717262020-06-20 10:54:23 +0800210 struct ext4_sb_info *sbi = EXT4_SB(sb);
211 int err;
212
213 /*
214 * If the block device has write error flag, it may have failed to
215 * async write out metadata buffers in the background. In this case,
216 * we could read old data from disk and write it out again, which
217 * may lead to on-disk filesystem inconsistency.
218 */
219 if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) {
220 spin_lock(&sbi->s_bdev_wb_lock);
221 err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);
222 spin_unlock(&sbi->s_bdev_wb_lock);
223 if (err)
224 ext4_error_err(sb, -err,
225 "Error while async write back metadata");
226 }
227}
228
Theodore Ts'o90c72012010-06-29 14:53:24 -0400229int __ext4_journal_get_write_access(const char *where, unsigned int line,
Jan Kara188c2992021-08-16 11:57:04 +0200230 handle_t *handle, struct super_block *sb,
231 struct buffer_head *bh,
232 enum ext4_journal_trigger_type trigger_type)
Andrew Morton8984d132006-12-06 20:37:15 -0800233{
Jan Kara188c2992021-08-16 11:57:04 +0200234 int err;
Frank Mayhar03901312009-01-07 00:06:22 -0500235
Theodore Ts'ob10a44c2013-04-03 22:00:52 -0400236 might_sleep();
237
Frank Mayhar03901312009-01-07 00:06:22 -0500238 if (ext4_handle_valid(handle)) {
239 err = jbd2_journal_get_write_access(handle, bh);
Jan Kara188c2992021-08-16 11:57:04 +0200240 if (err) {
Theodore Ts'o90c72012010-06-29 14:53:24 -0400241 ext4_journal_abort_handle(where, line, __func__, bh,
Frank Mayhar03901312009-01-07 00:06:22 -0500242 handle, err);
Jan Kara188c2992021-08-16 11:57:04 +0200243 return err;
244 }
Zhihao Chengada3fb82023-12-13 09:32:24 +0800245 } else
246 ext4_check_bdev_write_error(sb);
Jan Kara188c2992021-08-16 11:57:04 +0200247 if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
248 return 0;
249 BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
250 jbd2_journal_set_triggers(bh,
251 &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
252 return 0;
Andrew Morton8984d132006-12-06 20:37:15 -0800253}
254
Theodore Ts'od6797d12009-11-22 20:52:12 -0500255/*
256 * The ext4 forget function must perform a revoke if we are freeing data
257 * which has been journaled. Metadata (eg. indirect blocks) must be
258 * revoked in all cases.
259 *
260 * "bh" may be NULL: a metadata block may have been freed from memory
261 * but there may still be a record of it in the journal, and that record
262 * still needs to be revoked.
Theodore Ts'od6797d12009-11-22 20:52:12 -0500263 */
Theodore Ts'o90c72012010-06-29 14:53:24 -0400264int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
265 int is_metadata, struct inode *inode,
266 struct buffer_head *bh, ext4_fsblk_t blocknr)
Theodore Ts'od6797d12009-11-22 20:52:12 -0500267{
268 int err;
269
270 might_sleep();
271
272 trace_ext4_forget(inode, is_metadata, blocknr);
273 BUFFER_TRACE(bh, "enter");
274
Jan Kara4978c652022-06-08 13:23:47 +0200275 ext4_debug("forgetting bh %p: is_metadata=%d, mode %o, data mode %x\n",
Theodore Ts'od6797d12009-11-22 20:52:12 -0500276 bh, is_metadata, inode->i_mode,
277 test_opt(inode->i_sb, DATA_FLAGS));
278
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500279 /* In the no journal case, we can just do a bforget and return */
280 if (!ext4_handle_valid(handle)) {
281 bforget(bh);
282 return 0;
283 }
284
Theodore Ts'od6797d12009-11-22 20:52:12 -0500285 /* Never use the revoke function if we are doing full data
286 * journaling: there is no need to, and a V1 superblock won't
287 * support it. Otherwise, only skip the revoke on un-journaled
288 * data blocks. */
289
290 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
291 (!is_metadata && !ext4_should_journal_data(inode))) {
292 if (bh) {
293 BUFFER_TRACE(bh, "call jbd2_journal_forget");
Theodore Ts'ob7e57e72009-11-22 21:00:13 -0500294 err = jbd2_journal_forget(handle, bh);
295 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -0400296 ext4_journal_abort_handle(where, line, __func__,
297 bh, handle, err);
Theodore Ts'ob7e57e72009-11-22 21:00:13 -0500298 return err;
Theodore Ts'od6797d12009-11-22 20:52:12 -0500299 }
300 return 0;
301 }
302
303 /*
304 * data!=journal && (is_metadata || should_journal_data(inode))
305 */
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500306 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
307 err = jbd2_journal_revoke(handle, blocknr, bh);
308 if (err) {
Theodore Ts'o90c72012010-06-29 14:53:24 -0400309 ext4_journal_abort_handle(where, line, __func__,
310 bh, handle, err);
Jan Kara014c9ca2020-11-27 12:33:57 +0100311 __ext4_error(inode->i_sb, where, line, true, -err, 0,
312 "error %d when attempting revoke", err);
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500313 }
Theodore Ts'od6797d12009-11-22 20:52:12 -0500314 BUFFER_TRACE(bh, "exit");
315 return err;
316}
317
Theodore Ts'o90c72012010-06-29 14:53:24 -0400318int __ext4_journal_get_create_access(const char *where, unsigned int line,
Jan Kara188c2992021-08-16 11:57:04 +0200319 handle_t *handle, struct super_block *sb,
320 struct buffer_head *bh,
321 enum ext4_journal_trigger_type trigger_type)
Andrew Morton8984d132006-12-06 20:37:15 -0800322{
Jan Kara188c2992021-08-16 11:57:04 +0200323 int err;
Frank Mayhar03901312009-01-07 00:06:22 -0500324
Jan Kara188c2992021-08-16 11:57:04 +0200325 if (!ext4_handle_valid(handle))
326 return 0;
327
328 err = jbd2_journal_get_create_access(handle, bh);
329 if (err) {
330 ext4_journal_abort_handle(where, line, __func__, bh, handle,
331 err);
332 return err;
Frank Mayhar03901312009-01-07 00:06:22 -0500333 }
Jan Kara188c2992021-08-16 11:57:04 +0200334 if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
335 return 0;
336 BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
337 jbd2_journal_set_triggers(bh,
338 &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
339 return 0;
Andrew Morton8984d132006-12-06 20:37:15 -0800340}
341
Theodore Ts'o90c72012010-06-29 14:53:24 -0400342int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
343 handle_t *handle, struct inode *inode,
344 struct buffer_head *bh)
Andrew Morton8984d132006-12-06 20:37:15 -0800345{
Frank Mayhar03901312009-01-07 00:06:22 -0500346 int err = 0;
347
Theodore Ts'ob10a44c2013-04-03 22:00:52 -0400348 might_sleep();
349
Theodore Ts'o13fca322013-04-21 16:45:54 -0400350 set_buffer_meta(bh);
351 set_buffer_prio(bh);
Ye Bin558d6452021-06-15 17:05:37 +0800352 set_buffer_uptodate(bh);
Frank Mayhar03901312009-01-07 00:06:22 -0500353 if (ext4_handle_valid(handle)) {
354 err = jbd2_journal_dirty_metadata(handle, bh);
Dmitry Monakhovc5d31192014-10-01 22:23:15 -0400355 /* Errors can only happen due to aborted journal or a nasty bug */
356 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
Jan Kara91aa11f2013-08-12 09:53:28 -0400357 ext4_journal_abort_handle(where, line, __func__, bh,
358 handle, err);
Theodore Ts'o66a4cb12014-03-12 16:38:03 -0400359 if (inode == NULL) {
360 pr_err("EXT4: jbd2_journal_dirty_metadata "
361 "failed: handle type %u started at "
362 "line %u, credits %u/%u, errcode %d",
363 handle->h_type,
364 handle->h_line_no,
365 handle->h_requested_credits,
Jan Karaa9a83442019-11-05 17:44:17 +0100366 jbd2_handle_buffer_credits(handle), err);
Theodore Ts'o66a4cb12014-03-12 16:38:03 -0400367 return err;
368 }
Theodore Ts'oae1495b2013-12-02 09:31:36 -0500369 ext4_error_inode(inode, where, line,
370 bh->b_blocknr,
371 "journal_dirty_metadata failed: "
372 "handle type %u started at line %u, "
373 "credits %u/%u, errcode %d",
374 handle->h_type,
375 handle->h_line_no,
376 handle->h_requested_credits,
Jan Karaa9a83442019-11-05 17:44:17 +0100377 jbd2_handle_buffer_credits(handle),
378 err);
Theodore Ts'o9ea7a0d2011-09-04 10:18:14 -0400379 }
Frank Mayhar03901312009-01-07 00:06:22 -0500380 } else {
Curt Wohlgemuth73b50c12010-02-16 15:06:29 -0500381 if (inode)
Theodore Ts'ofe188c02009-09-12 13:41:55 -0400382 mark_buffer_dirty_inode(bh, inode);
383 else
384 mark_buffer_dirty(bh);
Frank Mayhar03901312009-01-07 00:06:22 -0500385 if (inode && inode_needs_sync(inode)) {
386 sync_dirty_buffer(bh);
387 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Theodore Ts'o54d3adb2020-03-28 19:33:43 -0400388 ext4_error_inode_err(inode, where, line,
389 bh->b_blocknr, EIO,
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400390 "IO error syncing itable block");
Frank Mayhar03901312009-01-07 00:06:22 -0500391 err = -EIO;
392 }
393 }
394 }
Andrew Morton8984d132006-12-06 20:37:15 -0800395 return err;
396}