Merge tag 'mips-fixes_5.15_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips...
[linux-2.6-microblaze.git] / fs / ext4 / ext4_jbd2.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Interface between ext4 and JBD
4  */
5
6 #include "ext4_jbd2.h"
7
8 #include <trace/events/ext4.h>
9
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
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  */
64 static int ext4_journal_check_start(struct super_block *sb)
65 {
66         journal_t *journal;
67
68         might_sleep();
69
70         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
71                 return -EIO;
72
73         if (sb_rdonly(sb))
74                 return -EROFS;
75         WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
76         journal = EXT4_SB(sb)->s_journal;
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          */
82         if (journal && is_journal_aborted(journal)) {
83                 ext4_abort(sb, -journal->j_errno, "Detected aborted journal");
84                 return -EROFS;
85         }
86         return 0;
87 }
88
89 handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
90                                   int type, int blocks, int rsv_blocks,
91                                   int revoke_creds)
92 {
93         journal_t *journal;
94         int err;
95
96         trace_ext4_journal_start(sb, blocks, rsv_blocks, revoke_creds,
97                                  _RET_IP_);
98         err = ext4_journal_check_start(sb);
99         if (err < 0)
100                 return ERR_PTR(err);
101
102         journal = EXT4_SB(sb)->s_journal;
103         if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
104                 return ext4_get_nojournal();
105         return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds,
106                                    GFP_NOFS, type, line);
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         }
119
120         err = handle->h_err;
121         if (!handle->h_transaction) {
122                 rc = jbd2_journal_stop(handle);
123                 return err ? err : rc;
124         }
125
126         sb = handle->h_transaction->t_journal->j_private;
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
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;
146         trace_ext4_journal_start_reserved(sb,
147                                 jbd2_handle_buffer_credits(handle), _RET_IP_);
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
160 int __ext4_journal_ensure_credits(handle_t *handle, int check_cred,
161                                   int extend_cred, int revoke_cred)
162 {
163         if (!ext4_handle_valid(handle))
164                 return 0;
165         if (jbd2_handle_buffer_credits(handle) >= check_cred &&
166             handle->h_revoke_credits >= revoke_cred)
167                 return 0;
168         extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle));
169         revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);
170         return ext4_journal_extend(handle, extend_cred, revoke_cred);
171 }
172
173 static void ext4_journal_abort_handle(const char *caller, unsigned int line,
174                                       const char *err_fn,
175                                       struct buffer_head *bh,
176                                       handle_t *handle, int err)
177 {
178         char nbuf[16];
179         const char *errstr = ext4_decode_error(NULL, err, nbuf);
180
181         BUG_ON(!ext4_handle_valid(handle));
182
183         if (bh)
184                 BUFFER_TRACE(bh, "abort");
185
186         if (!handle->h_err)
187                 handle->h_err = err;
188
189         if (is_handle_aborted(handle))
190                 return;
191
192         printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
193                caller, line, errstr, err_fn);
194
195         jbd2_journal_abort_handle(handle);
196 }
197
198 static void ext4_check_bdev_write_error(struct super_block *sb)
199 {
200         struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
201         struct ext4_sb_info *sbi = EXT4_SB(sb);
202         int err;
203
204         /*
205          * If the block device has write error flag, it may have failed to
206          * async write out metadata buffers in the background. In this case,
207          * we could read old data from disk and write it out again, which
208          * may lead to on-disk filesystem inconsistency.
209          */
210         if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) {
211                 spin_lock(&sbi->s_bdev_wb_lock);
212                 err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);
213                 spin_unlock(&sbi->s_bdev_wb_lock);
214                 if (err)
215                         ext4_error_err(sb, -err,
216                                        "Error while async write back metadata");
217         }
218 }
219
220 int __ext4_journal_get_write_access(const char *where, unsigned int line,
221                                     handle_t *handle, struct super_block *sb,
222                                     struct buffer_head *bh,
223                                     enum ext4_journal_trigger_type trigger_type)
224 {
225         int err;
226
227         might_sleep();
228
229         if (bh->b_bdev->bd_super)
230                 ext4_check_bdev_write_error(bh->b_bdev->bd_super);
231
232         if (ext4_handle_valid(handle)) {
233                 err = jbd2_journal_get_write_access(handle, bh);
234                 if (err) {
235                         ext4_journal_abort_handle(where, line, __func__, bh,
236                                                   handle, err);
237                         return err;
238                 }
239         }
240         if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
241                 return 0;
242         BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
243         jbd2_journal_set_triggers(bh,
244                 &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
245         return 0;
246 }
247
248 /*
249  * The ext4 forget function must perform a revoke if we are freeing data
250  * which has been journaled.  Metadata (eg. indirect blocks) must be
251  * revoked in all cases.
252  *
253  * "bh" may be NULL: a metadata block may have been freed from memory
254  * but there may still be a record of it in the journal, and that record
255  * still needs to be revoked.
256  */
257 int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
258                   int is_metadata, struct inode *inode,
259                   struct buffer_head *bh, ext4_fsblk_t blocknr)
260 {
261         int err;
262
263         might_sleep();
264
265         trace_ext4_forget(inode, is_metadata, blocknr);
266         BUFFER_TRACE(bh, "enter");
267
268         jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
269                   "data mode %x\n",
270                   bh, is_metadata, inode->i_mode,
271                   test_opt(inode->i_sb, DATA_FLAGS));
272
273         /* In the no journal case, we can just do a bforget and return */
274         if (!ext4_handle_valid(handle)) {
275                 bforget(bh);
276                 return 0;
277         }
278
279         /* Never use the revoke function if we are doing full data
280          * journaling: there is no need to, and a V1 superblock won't
281          * support it.  Otherwise, only skip the revoke on un-journaled
282          * data blocks. */
283
284         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
285             (!is_metadata && !ext4_should_journal_data(inode))) {
286                 if (bh) {
287                         BUFFER_TRACE(bh, "call jbd2_journal_forget");
288                         err = jbd2_journal_forget(handle, bh);
289                         if (err)
290                                 ext4_journal_abort_handle(where, line, __func__,
291                                                           bh, handle, err);
292                         return err;
293                 }
294                 return 0;
295         }
296
297         /*
298          * data!=journal && (is_metadata || should_journal_data(inode))
299          */
300         BUFFER_TRACE(bh, "call jbd2_journal_revoke");
301         err = jbd2_journal_revoke(handle, blocknr, bh);
302         if (err) {
303                 ext4_journal_abort_handle(where, line, __func__,
304                                           bh, handle, err);
305                 __ext4_error(inode->i_sb, where, line, true, -err, 0,
306                              "error %d when attempting revoke", err);
307         }
308         BUFFER_TRACE(bh, "exit");
309         return err;
310 }
311
312 int __ext4_journal_get_create_access(const char *where, unsigned int line,
313                                 handle_t *handle, struct super_block *sb,
314                                 struct buffer_head *bh,
315                                 enum ext4_journal_trigger_type trigger_type)
316 {
317         int err;
318
319         if (!ext4_handle_valid(handle))
320                 return 0;
321
322         err = jbd2_journal_get_create_access(handle, bh);
323         if (err) {
324                 ext4_journal_abort_handle(where, line, __func__, bh, handle,
325                                           err);
326                 return err;
327         }
328         if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
329                 return 0;
330         BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
331         jbd2_journal_set_triggers(bh,
332                 &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
333         return 0;
334 }
335
336 int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
337                                  handle_t *handle, struct inode *inode,
338                                  struct buffer_head *bh)
339 {
340         int err = 0;
341
342         might_sleep();
343
344         set_buffer_meta(bh);
345         set_buffer_prio(bh);
346         set_buffer_uptodate(bh);
347         if (ext4_handle_valid(handle)) {
348                 err = jbd2_journal_dirty_metadata(handle, bh);
349                 /* Errors can only happen due to aborted journal or a nasty bug */
350                 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
351                         ext4_journal_abort_handle(where, line, __func__, bh,
352                                                   handle, err);
353                         if (inode == NULL) {
354                                 pr_err("EXT4: jbd2_journal_dirty_metadata "
355                                        "failed: handle type %u started at "
356                                        "line %u, credits %u/%u, errcode %d",
357                                        handle->h_type,
358                                        handle->h_line_no,
359                                        handle->h_requested_credits,
360                                        jbd2_handle_buffer_credits(handle), err);
361                                 return err;
362                         }
363                         ext4_error_inode(inode, where, line,
364                                          bh->b_blocknr,
365                                          "journal_dirty_metadata failed: "
366                                          "handle type %u started at line %u, "
367                                          "credits %u/%u, errcode %d",
368                                          handle->h_type,
369                                          handle->h_line_no,
370                                          handle->h_requested_credits,
371                                          jbd2_handle_buffer_credits(handle),
372                                          err);
373                 }
374         } else {
375                 if (inode)
376                         mark_buffer_dirty_inode(bh, inode);
377                 else
378                         mark_buffer_dirty(bh);
379                 if (inode && inode_needs_sync(inode)) {
380                         sync_dirty_buffer(bh);
381                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
382                                 ext4_error_inode_err(inode, where, line,
383                                                      bh->b_blocknr, EIO,
384                                         "IO error syncing itable block");
385                                 err = -EIO;
386                         }
387                 }
388         }
389         return err;
390 }