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1/*
2 * Interface between ext4 and JBD
3 */
4
5#include "ext4_jbd2.h"
6
7#include <trace/events/ext4.h>
8
9int __ext4_journal_get_write_access(const char *where, unsigned int line,
10 handle_t *handle, struct buffer_head *bh)
11{
12 int err = 0;
13
14 if (ext4_handle_valid(handle)) {
15 err = jbd2_journal_get_write_access(handle, bh);
16 if (err)
17 ext4_journal_abort_handle(where, line, __func__, bh,
18 handle, err);
19 }
20 return err;
21}
22
23/*
24 * The ext4 forget function must perform a revoke if we are freeing data
25 * which has been journaled. Metadata (eg. indirect blocks) must be
26 * revoked in all cases.
27 *
28 * "bh" may be NULL: a metadata block may have been freed from memory
29 * but there may still be a record of it in the journal, and that record
30 * still needs to be revoked.
31 *
32 * If the handle isn't valid we're not journaling, but we still need to
33 * call into ext4_journal_revoke() to put the buffer head.
34 */
35int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
36 int is_metadata, struct inode *inode,
37 struct buffer_head *bh, ext4_fsblk_t blocknr)
38{
39 int err;
40
41 might_sleep();
42
43 trace_ext4_forget(inode, is_metadata, blocknr);
44 BUFFER_TRACE(bh, "enter");
45
46 jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
47 "data mode %x\n",
48 bh, is_metadata, inode->i_mode,
49 test_opt(inode->i_sb, DATA_FLAGS));
50
51 /* In the no journal case, we can just do a bforget and return */
52 if (!ext4_handle_valid(handle)) {
53 bforget(bh);
54 return 0;
55 }
56
57 /* Never use the revoke function if we are doing full data
58 * journaling: there is no need to, and a V1 superblock won't
59 * support it. Otherwise, only skip the revoke on un-journaled
60 * data blocks. */
61
62 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
63 (!is_metadata && !ext4_should_journal_data(inode))) {
64 if (bh) {
65 BUFFER_TRACE(bh, "call jbd2_journal_forget");
66 err = jbd2_journal_forget(handle, bh);
67 if (err)
68 ext4_journal_abort_handle(where, line, __func__,
69 bh, handle, err);
70 return err;
71 }
72 return 0;
73 }
74
75 /*
76 * data!=journal && (is_metadata || should_journal_data(inode))
77 */
78 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
79 err = jbd2_journal_revoke(handle, blocknr, bh);
80 if (err) {
81 ext4_journal_abort_handle(where, line, __func__,
82 bh, handle, err);
83 __ext4_abort(inode->i_sb, where, line,
84 "error %d when attempting revoke", err);
85 }
86 BUFFER_TRACE(bh, "exit");
87 return err;
88}
89
90int __ext4_journal_get_create_access(const char *where, unsigned int line,
91 handle_t *handle, struct buffer_head *bh)
92{
93 int err = 0;
94
95 if (ext4_handle_valid(handle)) {
96 err = jbd2_journal_get_create_access(handle, bh);
97 if (err)
98 ext4_journal_abort_handle(where, line, __func__,
99 bh, handle, err);
100 }
101 return err;
102}
103
104int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
105 handle_t *handle, struct inode *inode,
106 struct buffer_head *bh)
107{
108 int err = 0;
109
110 if (ext4_handle_valid(handle)) {
111 err = jbd2_journal_dirty_metadata(handle, bh);
112 if (err) {
113 /* Errors can only happen if there is a bug */
114 handle->h_err = err;
115 __ext4_journal_stop(where, line, handle);
116 }
117 } else {
118 if (inode)
119 mark_buffer_dirty_inode(bh, inode);
120 else
121 mark_buffer_dirty(bh);
122 if (inode && inode_needs_sync(inode)) {
123 sync_dirty_buffer(bh);
124 if (buffer_req(bh) && !buffer_uptodate(bh)) {
125 struct ext4_super_block *es;
126
127 es = EXT4_SB(inode->i_sb)->s_es;
128 es->s_last_error_block =
129 cpu_to_le64(bh->b_blocknr);
130 ext4_error_inode(inode, where, line,
131 bh->b_blocknr,
132 "IO error syncing itable block");
133 err = -EIO;
134 }
135 }
136 }
137 return err;
138}
139
140int __ext4_handle_dirty_super(const char *where, unsigned int line,
141 handle_t *handle, struct super_block *sb,
142 int now)
143{
144 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
145 int err = 0;
146
147 if (ext4_handle_valid(handle)) {
148 ext4_superblock_csum_set(sb,
149 (struct ext4_super_block *)bh->b_data);
150 err = jbd2_journal_dirty_metadata(handle, bh);
151 if (err)
152 ext4_journal_abort_handle(where, line, __func__,
153 bh, handle, err);
154 } else if (now) {
155 ext4_superblock_csum_set(sb,
156 (struct ext4_super_block *)bh->b_data);
157 mark_buffer_dirty(bh);
158 } else
159 sb->s_dirt = 1;
160 return err;
161}
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
10int 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 */
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 */
64static 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
89handle_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
109int __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
136handle_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
160int __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
173static 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
198static 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
220int __ext4_journal_get_write_access(const char *where, unsigned int line,
221 handle_t *handle, struct buffer_head *bh)
222{
223 int err = 0;
224
225 might_sleep();
226
227 if (bh->b_bdev->bd_super)
228 ext4_check_bdev_write_error(bh->b_bdev->bd_super);
229
230 if (ext4_handle_valid(handle)) {
231 err = jbd2_journal_get_write_access(handle, bh);
232 if (err)
233 ext4_journal_abort_handle(where, line, __func__, bh,
234 handle, err);
235 }
236 return err;
237}
238
239/*
240 * The ext4 forget function must perform a revoke if we are freeing data
241 * which has been journaled. Metadata (eg. indirect blocks) must be
242 * revoked in all cases.
243 *
244 * "bh" may be NULL: a metadata block may have been freed from memory
245 * but there may still be a record of it in the journal, and that record
246 * still needs to be revoked.
247 */
248int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
249 int is_metadata, struct inode *inode,
250 struct buffer_head *bh, ext4_fsblk_t blocknr)
251{
252 int err;
253
254 might_sleep();
255
256 trace_ext4_forget(inode, is_metadata, blocknr);
257 BUFFER_TRACE(bh, "enter");
258
259 jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
260 "data mode %x\n",
261 bh, is_metadata, inode->i_mode,
262 test_opt(inode->i_sb, DATA_FLAGS));
263
264 /* In the no journal case, we can just do a bforget and return */
265 if (!ext4_handle_valid(handle)) {
266 bforget(bh);
267 return 0;
268 }
269
270 /* Never use the revoke function if we are doing full data
271 * journaling: there is no need to, and a V1 superblock won't
272 * support it. Otherwise, only skip the revoke on un-journaled
273 * data blocks. */
274
275 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
276 (!is_metadata && !ext4_should_journal_data(inode))) {
277 if (bh) {
278 BUFFER_TRACE(bh, "call jbd2_journal_forget");
279 err = jbd2_journal_forget(handle, bh);
280 if (err)
281 ext4_journal_abort_handle(where, line, __func__,
282 bh, handle, err);
283 return err;
284 }
285 return 0;
286 }
287
288 /*
289 * data!=journal && (is_metadata || should_journal_data(inode))
290 */
291 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
292 err = jbd2_journal_revoke(handle, blocknr, bh);
293 if (err) {
294 ext4_journal_abort_handle(where, line, __func__,
295 bh, handle, err);
296 __ext4_error(inode->i_sb, where, line, true, -err, 0,
297 "error %d when attempting revoke", err);
298 }
299 BUFFER_TRACE(bh, "exit");
300 return err;
301}
302
303int __ext4_journal_get_create_access(const char *where, unsigned int line,
304 handle_t *handle, struct buffer_head *bh)
305{
306 int err = 0;
307
308 if (ext4_handle_valid(handle)) {
309 err = jbd2_journal_get_create_access(handle, bh);
310 if (err)
311 ext4_journal_abort_handle(where, line, __func__,
312 bh, handle, err);
313 }
314 return err;
315}
316
317int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
318 handle_t *handle, struct inode *inode,
319 struct buffer_head *bh)
320{
321 int err = 0;
322
323 might_sleep();
324
325 set_buffer_meta(bh);
326 set_buffer_prio(bh);
327 set_buffer_uptodate(bh);
328 if (ext4_handle_valid(handle)) {
329 err = jbd2_journal_dirty_metadata(handle, bh);
330 /* Errors can only happen due to aborted journal or a nasty bug */
331 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
332 ext4_journal_abort_handle(where, line, __func__, bh,
333 handle, err);
334 if (inode == NULL) {
335 pr_err("EXT4: jbd2_journal_dirty_metadata "
336 "failed: handle type %u started at "
337 "line %u, credits %u/%u, errcode %d",
338 handle->h_type,
339 handle->h_line_no,
340 handle->h_requested_credits,
341 jbd2_handle_buffer_credits(handle), err);
342 return err;
343 }
344 ext4_error_inode(inode, where, line,
345 bh->b_blocknr,
346 "journal_dirty_metadata failed: "
347 "handle type %u started at line %u, "
348 "credits %u/%u, errcode %d",
349 handle->h_type,
350 handle->h_line_no,
351 handle->h_requested_credits,
352 jbd2_handle_buffer_credits(handle),
353 err);
354 }
355 } else {
356 if (inode)
357 mark_buffer_dirty_inode(bh, inode);
358 else
359 mark_buffer_dirty(bh);
360 if (inode && inode_needs_sync(inode)) {
361 sync_dirty_buffer(bh);
362 if (buffer_req(bh) && !buffer_uptodate(bh)) {
363 ext4_error_inode_err(inode, where, line,
364 bh->b_blocknr, EIO,
365 "IO error syncing itable block");
366 err = -EIO;
367 }
368 }
369 }
370 return err;
371}