Line data Source code
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 17251 : int ext4_inode_journal_mode(struct inode *inode)
11 : {
12 17251 : if (EXT4_JOURNAL(inode) == NULL)
13 : return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
14 : /* We do not support data journalling with delayed allocation */
15 17249 : if (!S_ISREG(inode->i_mode) ||
16 16153 : ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE) ||
17 16153 : test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
18 16153 : (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
19 0 : !test_opt(inode->i_sb, DELALLOC))) {
20 : /* We do not support data journalling for encrypted data */
21 1096 : if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
22 : return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
23 1096 : return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
24 : }
25 16153 : if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
26 : return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
27 0 : if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
28 : return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
29 0 : BUG();
30 : }
31 :
32 : /* Just increment the non-pointer handle value */
33 0 : static handle_t *ext4_get_nojournal(void)
34 : {
35 0 : handle_t *handle = current->journal_info;
36 0 : unsigned long ref_cnt = (unsigned long)handle;
37 :
38 0 : BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
39 :
40 0 : ref_cnt++;
41 0 : handle = (handle_t *)ref_cnt;
42 :
43 0 : current->journal_info = handle;
44 0 : return handle;
45 : }
46 :
47 :
48 : /* Decrement the non-pointer handle value */
49 0 : static void ext4_put_nojournal(handle_t *handle)
50 : {
51 0 : unsigned long ref_cnt = (unsigned long)handle;
52 :
53 0 : BUG_ON(ref_cnt == 0);
54 :
55 0 : ref_cnt--;
56 0 : handle = (handle_t *)ref_cnt;
57 :
58 0 : current->journal_info = handle;
59 0 : }
60 :
61 : /*
62 : * Wrappers for jbd2_journal_start/end.
63 : */
64 8919 : static int ext4_journal_check_start(struct super_block *sb)
65 : {
66 8919 : journal_t *journal;
67 :
68 8919 : might_sleep();
69 :
70 8919 : if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
71 : return -EIO;
72 :
73 8919 : if (sb_rdonly(sb))
74 : return -EROFS;
75 8919 : WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
76 8919 : 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 8919 : if (journal && is_journal_aborted(journal)) {
83 0 : ext4_abort(sb, -journal->j_errno, "Detected aborted journal");
84 0 : return -EROFS;
85 : }
86 : return 0;
87 : }
88 :
89 8849 : 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 8849 : journal_t *journal;
94 8849 : int err;
95 :
96 8849 : trace_ext4_journal_start(sb, blocks, rsv_blocks, revoke_creds,
97 8849 : _RET_IP_);
98 8849 : err = ext4_journal_check_start(sb);
99 8849 : if (err < 0)
100 0 : return ERR_PTR(err);
101 :
102 8849 : journal = EXT4_SB(sb)->s_journal;
103 8849 : if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
104 0 : return ext4_get_nojournal();
105 8849 : return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds,
106 : GFP_NOFS, type, line);
107 : }
108 :
109 8919 : int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
110 : {
111 8919 : struct super_block *sb;
112 8919 : int err;
113 8919 : int rc;
114 :
115 8919 : if (!ext4_handle_valid(handle)) {
116 0 : ext4_put_nojournal(handle);
117 0 : return 0;
118 : }
119 :
120 8919 : err = handle->h_err;
121 8919 : if (!handle->h_transaction) {
122 0 : rc = jbd2_journal_stop(handle);
123 0 : return err ? err : rc;
124 : }
125 :
126 8919 : sb = handle->h_transaction->t_journal->j_private;
127 8919 : rc = jbd2_journal_stop(handle);
128 :
129 8919 : if (!err)
130 8919 : err = rc;
131 8919 : if (err)
132 0 : __ext4_std_error(sb, where, line, err);
133 : return err;
134 : }
135 :
136 70 : handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
137 : int type)
138 : {
139 70 : struct super_block *sb;
140 70 : int err;
141 :
142 70 : if (!ext4_handle_valid(handle))
143 0 : return ext4_get_nojournal();
144 :
145 70 : sb = handle->h_journal->j_private;
146 70 : trace_ext4_journal_start_reserved(sb,
147 70 : jbd2_handle_buffer_credits(handle), _RET_IP_);
148 70 : err = ext4_journal_check_start(sb);
149 70 : if (err < 0) {
150 0 : jbd2_journal_free_reserved(handle);
151 0 : return ERR_PTR(err);
152 : }
153 :
154 70 : err = jbd2_journal_start_reserved(handle, type, line);
155 70 : if (err < 0)
156 0 : return ERR_PTR(err);
157 : return handle;
158 : }
159 :
160 393 : int __ext4_journal_ensure_credits(handle_t *handle, int check_cred,
161 : int extend_cred, int revoke_cred)
162 : {
163 393 : if (!ext4_handle_valid(handle))
164 : return 0;
165 393 : if (jbd2_handle_buffer_credits(handle) >= check_cred &&
166 393 : handle->h_revoke_credits >= revoke_cred)
167 : return 0;
168 0 : extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle));
169 0 : revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);
170 0 : return ext4_journal_extend(handle, extend_cred, revoke_cred);
171 : }
172 :
173 0 : 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 0 : char nbuf[16];
179 0 : const char *errstr = ext4_decode_error(NULL, err, nbuf);
180 :
181 0 : BUG_ON(!ext4_handle_valid(handle));
182 :
183 0 : if (bh)
184 0 : BUFFER_TRACE(bh, "abort");
185 :
186 0 : if (!handle->h_err)
187 0 : handle->h_err = err;
188 :
189 0 : if (is_handle_aborted(handle))
190 0 : return;
191 :
192 0 : printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
193 : caller, line, errstr, err_fn);
194 :
195 0 : jbd2_journal_abort_handle(handle);
196 : }
197 :
198 14537 : static void ext4_check_bdev_write_error(struct super_block *sb)
199 : {
200 14537 : struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
201 14537 : struct ext4_sb_info *sbi = EXT4_SB(sb);
202 14537 : 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 14537 : if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) {
211 0 : spin_lock(&sbi->s_bdev_wb_lock);
212 0 : err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);
213 0 : spin_unlock(&sbi->s_bdev_wb_lock);
214 0 : if (err)
215 0 : ext4_error_err(sb, -err,
216 : "Error while async write back metadata");
217 : }
218 14537 : }
219 :
220 14537 : int __ext4_journal_get_write_access(const char *where, unsigned int line,
221 : handle_t *handle, struct buffer_head *bh)
222 : {
223 14537 : int err = 0;
224 :
225 14537 : might_sleep();
226 :
227 14537 : if (bh->b_bdev->bd_super)
228 14537 : ext4_check_bdev_write_error(bh->b_bdev->bd_super);
229 :
230 14537 : if (ext4_handle_valid(handle)) {
231 14537 : err = jbd2_journal_get_write_access(handle, bh);
232 14537 : if (err)
233 0 : ext4_journal_abort_handle(where, line, __func__, bh,
234 : handle, err);
235 : }
236 14537 : 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 : *
248 : * If the handle isn't valid we're not journaling, but we still need to
249 : * call into ext4_journal_revoke() to put the buffer head.
250 : */
251 77 : int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
252 : int is_metadata, struct inode *inode,
253 : struct buffer_head *bh, ext4_fsblk_t blocknr)
254 : {
255 77 : int err;
256 :
257 77 : might_sleep();
258 :
259 77 : trace_ext4_forget(inode, is_metadata, blocknr);
260 77 : BUFFER_TRACE(bh, "enter");
261 :
262 : jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
263 : "data mode %x\n",
264 : bh, is_metadata, inode->i_mode,
265 77 : test_opt(inode->i_sb, DATA_FLAGS));
266 :
267 : /* In the no journal case, we can just do a bforget and return */
268 77 : if (!ext4_handle_valid(handle)) {
269 0 : bforget(bh);
270 0 : return 0;
271 : }
272 :
273 : /* Never use the revoke function if we are doing full data
274 : * journaling: there is no need to, and a V1 superblock won't
275 : * support it. Otherwise, only skip the revoke on un-journaled
276 : * data blocks. */
277 :
278 77 : if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
279 0 : (!is_metadata && !ext4_should_journal_data(inode))) {
280 0 : if (bh) {
281 0 : BUFFER_TRACE(bh, "call jbd2_journal_forget");
282 0 : err = jbd2_journal_forget(handle, bh);
283 0 : if (err)
284 0 : ext4_journal_abort_handle(where, line, __func__,
285 : bh, handle, err);
286 0 : return err;
287 : }
288 : return 0;
289 : }
290 :
291 : /*
292 : * data!=journal && (is_metadata || should_journal_data(inode))
293 : */
294 77 : BUFFER_TRACE(bh, "call jbd2_journal_revoke");
295 77 : err = jbd2_journal_revoke(handle, blocknr, bh);
296 77 : if (err) {
297 0 : ext4_journal_abort_handle(where, line, __func__,
298 : bh, handle, err);
299 0 : __ext4_error(inode->i_sb, where, line, true, -err, 0,
300 : "error %d when attempting revoke", err);
301 : }
302 : BUFFER_TRACE(bh, "exit");
303 : return err;
304 : }
305 :
306 175 : int __ext4_journal_get_create_access(const char *where, unsigned int line,
307 : handle_t *handle, struct buffer_head *bh)
308 : {
309 175 : int err = 0;
310 :
311 175 : if (ext4_handle_valid(handle)) {
312 175 : err = jbd2_journal_get_create_access(handle, bh);
313 175 : if (err)
314 0 : ext4_journal_abort_handle(where, line, __func__,
315 : bh, handle, err);
316 : }
317 175 : return err;
318 : }
319 :
320 14708 : int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
321 : handle_t *handle, struct inode *inode,
322 : struct buffer_head *bh)
323 : {
324 14708 : int err = 0;
325 :
326 14708 : might_sleep();
327 :
328 14708 : set_buffer_meta(bh);
329 14708 : set_buffer_prio(bh);
330 14708 : if (ext4_handle_valid(handle)) {
331 14708 : err = jbd2_journal_dirty_metadata(handle, bh);
332 : /* Errors can only happen due to aborted journal or a nasty bug */
333 29416 : if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
334 0 : ext4_journal_abort_handle(where, line, __func__, bh,
335 : handle, err);
336 0 : if (inode == NULL) {
337 0 : pr_err("EXT4: jbd2_journal_dirty_metadata "
338 : "failed: handle type %u started at "
339 : "line %u, credits %u/%u, errcode %d",
340 : handle->h_type,
341 : handle->h_line_no,
342 : handle->h_requested_credits,
343 : jbd2_handle_buffer_credits(handle), err);
344 0 : return err;
345 : }
346 0 : ext4_error_inode(inode, where, line,
347 : bh->b_blocknr,
348 : "journal_dirty_metadata failed: "
349 : "handle type %u started at line %u, "
350 : "credits %u/%u, errcode %d",
351 : handle->h_type,
352 : handle->h_line_no,
353 : handle->h_requested_credits,
354 : jbd2_handle_buffer_credits(handle),
355 : err);
356 : }
357 : } else {
358 0 : set_buffer_uptodate(bh);
359 0 : if (inode)
360 0 : mark_buffer_dirty_inode(bh, inode);
361 : else
362 0 : mark_buffer_dirty(bh);
363 0 : if (inode && inode_needs_sync(inode)) {
364 0 : sync_dirty_buffer(bh);
365 0 : if (buffer_req(bh) && !buffer_uptodate(bh)) {
366 0 : ext4_error_inode_err(inode, where, line,
367 : bh->b_blocknr, EIO,
368 : "IO error syncing itable block");
369 0 : err = -EIO;
370 : }
371 : }
372 : }
373 : return err;
374 : }
|
