Commit | Line | Data |
---|---|---|
8984d137 AM |
1 | /* |
2 | * Interface between ext4 and JBD | |
3 | */ | |
4 | ||
3dcf5451 | 5 | #include "ext4_jbd2.h" |
8984d137 | 6 | |
d6797d14 TT |
7 | #include <trace/events/ext4.h> |
8 | ||
722887dd TT |
9 | /* Just increment the non-pointer handle value */ |
10 | static handle_t *ext4_get_nojournal(void) | |
11 | { | |
12 | handle_t *handle = current->journal_info; | |
13 | unsigned long ref_cnt = (unsigned long)handle; | |
14 | ||
15 | BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); | |
16 | ||
17 | ref_cnt++; | |
18 | handle = (handle_t *)ref_cnt; | |
19 | ||
20 | current->journal_info = handle; | |
21 | return handle; | |
22 | } | |
23 | ||
24 | ||
25 | /* Decrement the non-pointer handle value */ | |
26 | static void ext4_put_nojournal(handle_t *handle) | |
27 | { | |
28 | unsigned long ref_cnt = (unsigned long)handle; | |
29 | ||
30 | BUG_ON(ref_cnt == 0); | |
31 | ||
32 | ref_cnt--; | |
33 | handle = (handle_t *)ref_cnt; | |
34 | ||
35 | current->journal_info = handle; | |
36 | } | |
37 | ||
38 | /* | |
39 | * Wrappers for jbd2_journal_start/end. | |
40 | */ | |
5fe2fe89 | 41 | static int ext4_journal_check_start(struct super_block *sb) |
722887dd TT |
42 | { |
43 | journal_t *journal; | |
44 | ||
b10a44c3 | 45 | might_sleep(); |
722887dd | 46 | if (sb->s_flags & MS_RDONLY) |
5fe2fe89 | 47 | return -EROFS; |
722887dd TT |
48 | WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE); |
49 | journal = EXT4_SB(sb)->s_journal; | |
722887dd TT |
50 | /* |
51 | * Special case here: if the journal has aborted behind our | |
52 | * backs (eg. EIO in the commit thread), then we still need to | |
53 | * take the FS itself readonly cleanly. | |
54 | */ | |
5fe2fe89 | 55 | if (journal && is_journal_aborted(journal)) { |
722887dd | 56 | ext4_abort(sb, "Detected aborted journal"); |
5fe2fe89 | 57 | return -EROFS; |
722887dd | 58 | } |
5fe2fe89 JK |
59 | return 0; |
60 | } | |
61 | ||
62 | handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line, | |
63 | int type, int blocks, int rsv_blocks) | |
64 | { | |
65 | journal_t *journal; | |
66 | int err; | |
67 | ||
68 | trace_ext4_journal_start(sb, blocks, rsv_blocks, _RET_IP_); | |
69 | err = ext4_journal_check_start(sb); | |
70 | if (err < 0) | |
71 | return ERR_PTR(err); | |
72 | ||
73 | journal = EXT4_SB(sb)->s_journal; | |
74 | if (!journal) | |
75 | return ext4_get_nojournal(); | |
76 | return jbd2__journal_start(journal, blocks, rsv_blocks, GFP_NOFS, | |
77 | type, line); | |
722887dd TT |
78 | } |
79 | ||
80 | int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) | |
81 | { | |
82 | struct super_block *sb; | |
83 | int err; | |
84 | int rc; | |
85 | ||
86 | if (!ext4_handle_valid(handle)) { | |
87 | ext4_put_nojournal(handle); | |
88 | return 0; | |
89 | } | |
90 | sb = handle->h_transaction->t_journal->j_private; | |
91 | err = handle->h_err; | |
92 | rc = jbd2_journal_stop(handle); | |
93 | ||
94 | if (!err) | |
95 | err = rc; | |
96 | if (err) | |
97 | __ext4_std_error(sb, where, line, err); | |
98 | return err; | |
99 | } | |
100 | ||
5fe2fe89 JK |
101 | handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line, |
102 | int type) | |
103 | { | |
104 | struct super_block *sb; | |
105 | int err; | |
106 | ||
107 | if (!ext4_handle_valid(handle)) | |
108 | return ext4_get_nojournal(); | |
109 | ||
110 | sb = handle->h_journal->j_private; | |
111 | trace_ext4_journal_start_reserved(sb, handle->h_buffer_credits, | |
112 | _RET_IP_); | |
113 | err = ext4_journal_check_start(sb); | |
114 | if (err < 0) { | |
115 | jbd2_journal_free_reserved(handle); | |
116 | return ERR_PTR(err); | |
117 | } | |
118 | ||
119 | err = jbd2_journal_start_reserved(handle, type, line); | |
120 | if (err < 0) | |
121 | return ERR_PTR(err); | |
122 | return handle; | |
123 | } | |
124 | ||
c197855e SH |
125 | static void ext4_journal_abort_handle(const char *caller, unsigned int line, |
126 | const char *err_fn, | |
127 | struct buffer_head *bh, | |
128 | handle_t *handle, int err) | |
722887dd TT |
129 | { |
130 | char nbuf[16]; | |
131 | const char *errstr = ext4_decode_error(NULL, err, nbuf); | |
132 | ||
133 | BUG_ON(!ext4_handle_valid(handle)); | |
134 | ||
135 | if (bh) | |
136 | BUFFER_TRACE(bh, "abort"); | |
137 | ||
138 | if (!handle->h_err) | |
139 | handle->h_err = err; | |
140 | ||
141 | if (is_handle_aborted(handle)) | |
142 | return; | |
143 | ||
144 | printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n", | |
145 | caller, line, errstr, err_fn); | |
146 | ||
147 | jbd2_journal_abort_handle(handle); | |
148 | } | |
149 | ||
90c7201b TT |
150 | int __ext4_journal_get_write_access(const char *where, unsigned int line, |
151 | handle_t *handle, struct buffer_head *bh) | |
8984d137 | 152 | { |
0390131b FM |
153 | int err = 0; |
154 | ||
b10a44c3 TT |
155 | might_sleep(); |
156 | ||
0390131b FM |
157 | if (ext4_handle_valid(handle)) { |
158 | err = jbd2_journal_get_write_access(handle, bh); | |
159 | if (err) | |
90c7201b | 160 | ext4_journal_abort_handle(where, line, __func__, bh, |
0390131b FM |
161 | handle, err); |
162 | } | |
8984d137 AM |
163 | return err; |
164 | } | |
165 | ||
d6797d14 TT |
166 | /* |
167 | * The ext4 forget function must perform a revoke if we are freeing data | |
168 | * which has been journaled. Metadata (eg. indirect blocks) must be | |
169 | * revoked in all cases. | |
170 | * | |
171 | * "bh" may be NULL: a metadata block may have been freed from memory | |
172 | * but there may still be a record of it in the journal, and that record | |
173 | * still needs to be revoked. | |
174 | * | |
175 | * If the handle isn't valid we're not journaling, but we still need to | |
176 | * call into ext4_journal_revoke() to put the buffer head. | |
177 | */ | |
90c7201b TT |
178 | int __ext4_forget(const char *where, unsigned int line, handle_t *handle, |
179 | int is_metadata, struct inode *inode, | |
180 | struct buffer_head *bh, ext4_fsblk_t blocknr) | |
d6797d14 TT |
181 | { |
182 | int err; | |
183 | ||
184 | might_sleep(); | |
185 | ||
186 | trace_ext4_forget(inode, is_metadata, blocknr); | |
187 | BUFFER_TRACE(bh, "enter"); | |
188 | ||
189 | jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, " | |
190 | "data mode %x\n", | |
191 | bh, is_metadata, inode->i_mode, | |
192 | test_opt(inode->i_sb, DATA_FLAGS)); | |
193 | ||
e4684b3f TT |
194 | /* In the no journal case, we can just do a bforget and return */ |
195 | if (!ext4_handle_valid(handle)) { | |
196 | bforget(bh); | |
197 | return 0; | |
198 | } | |
199 | ||
d6797d14 TT |
200 | /* Never use the revoke function if we are doing full data |
201 | * journaling: there is no need to, and a V1 superblock won't | |
202 | * support it. Otherwise, only skip the revoke on un-journaled | |
203 | * data blocks. */ | |
204 | ||
205 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA || | |
206 | (!is_metadata && !ext4_should_journal_data(inode))) { | |
207 | if (bh) { | |
208 | BUFFER_TRACE(bh, "call jbd2_journal_forget"); | |
b7e57e7c TT |
209 | err = jbd2_journal_forget(handle, bh); |
210 | if (err) | |
90c7201b TT |
211 | ext4_journal_abort_handle(where, line, __func__, |
212 | bh, handle, err); | |
b7e57e7c | 213 | return err; |
d6797d14 TT |
214 | } |
215 | return 0; | |
216 | } | |
217 | ||
218 | /* | |
219 | * data!=journal && (is_metadata || should_journal_data(inode)) | |
220 | */ | |
e4684b3f TT |
221 | BUFFER_TRACE(bh, "call jbd2_journal_revoke"); |
222 | err = jbd2_journal_revoke(handle, blocknr, bh); | |
223 | if (err) { | |
90c7201b TT |
224 | ext4_journal_abort_handle(where, line, __func__, |
225 | bh, handle, err); | |
c398eda0 TT |
226 | __ext4_abort(inode->i_sb, where, line, |
227 | "error %d when attempting revoke", err); | |
e4684b3f | 228 | } |
d6797d14 TT |
229 | BUFFER_TRACE(bh, "exit"); |
230 | return err; | |
231 | } | |
232 | ||
90c7201b | 233 | int __ext4_journal_get_create_access(const char *where, unsigned int line, |
8984d137 AM |
234 | handle_t *handle, struct buffer_head *bh) |
235 | { | |
0390131b FM |
236 | int err = 0; |
237 | ||
238 | if (ext4_handle_valid(handle)) { | |
239 | err = jbd2_journal_get_create_access(handle, bh); | |
240 | if (err) | |
90c7201b TT |
241 | ext4_journal_abort_handle(where, line, __func__, |
242 | bh, handle, err); | |
0390131b | 243 | } |
8984d137 AM |
244 | return err; |
245 | } | |
246 | ||
90c7201b TT |
247 | int __ext4_handle_dirty_metadata(const char *where, unsigned int line, |
248 | handle_t *handle, struct inode *inode, | |
249 | struct buffer_head *bh) | |
8984d137 | 250 | { |
0390131b FM |
251 | int err = 0; |
252 | ||
b10a44c3 TT |
253 | might_sleep(); |
254 | ||
13fca323 TT |
255 | set_buffer_meta(bh); |
256 | set_buffer_prio(bh); | |
0390131b FM |
257 | if (ext4_handle_valid(handle)) { |
258 | err = jbd2_journal_dirty_metadata(handle, bh); | |
91aa11fa JK |
259 | /* Errors can only happen if there is a bug */ |
260 | if (WARN_ON_ONCE(err)) { | |
261 | ext4_journal_abort_handle(where, line, __func__, bh, | |
262 | handle, err); | |
66a4cb18 TT |
263 | if (inode == NULL) { |
264 | pr_err("EXT4: jbd2_journal_dirty_metadata " | |
265 | "failed: handle type %u started at " | |
266 | "line %u, credits %u/%u, errcode %d", | |
267 | handle->h_type, | |
268 | handle->h_line_no, | |
269 | handle->h_requested_credits, | |
270 | handle->h_buffer_credits, err); | |
271 | return err; | |
272 | } | |
ae1495b1 TT |
273 | ext4_error_inode(inode, where, line, |
274 | bh->b_blocknr, | |
275 | "journal_dirty_metadata failed: " | |
276 | "handle type %u started at line %u, " | |
277 | "credits %u/%u, errcode %d", | |
278 | handle->h_type, | |
279 | handle->h_line_no, | |
280 | handle->h_requested_credits, | |
281 | handle->h_buffer_credits, err); | |
9ea7a0df | 282 | } |
0390131b | 283 | } else { |
73b50c1c | 284 | if (inode) |
fe188c0e TT |
285 | mark_buffer_dirty_inode(bh, inode); |
286 | else | |
287 | mark_buffer_dirty(bh); | |
0390131b FM |
288 | if (inode && inode_needs_sync(inode)) { |
289 | sync_dirty_buffer(bh); | |
290 | if (buffer_req(bh) && !buffer_uptodate(bh)) { | |
1c13d5c0 TT |
291 | struct ext4_super_block *es; |
292 | ||
293 | es = EXT4_SB(inode->i_sb)->s_es; | |
294 | es->s_last_error_block = | |
295 | cpu_to_le64(bh->b_blocknr); | |
c398eda0 TT |
296 | ext4_error_inode(inode, where, line, |
297 | bh->b_blocknr, | |
298 | "IO error syncing itable block"); | |
0390131b FM |
299 | err = -EIO; |
300 | } | |
301 | } | |
302 | } | |
8984d137 AM |
303 | return err; |
304 | } | |
a0375156 | 305 | |
90c7201b | 306 | int __ext4_handle_dirty_super(const char *where, unsigned int line, |
b50924c2 | 307 | handle_t *handle, struct super_block *sb) |
a0375156 TT |
308 | { |
309 | struct buffer_head *bh = EXT4_SB(sb)->s_sbh; | |
310 | int err = 0; | |
311 | ||
06db49e6 | 312 | ext4_superblock_csum_set(sb); |
a0375156 TT |
313 | if (ext4_handle_valid(handle)) { |
314 | err = jbd2_journal_dirty_metadata(handle, bh); | |
315 | if (err) | |
90c7201b TT |
316 | ext4_journal_abort_handle(where, line, __func__, |
317 | bh, handle, err); | |
06db49e6 | 318 | } else |
a9c47317 | 319 | mark_buffer_dirty(bh); |
a0375156 TT |
320 | return err; |
321 | } |