Merge branch 'ib-chrome-platform-atmel-mxt-ts-device-properties' of git://git.kernel...
[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 /* Just increment the non-pointer handle value */
11 static handle_t *ext4_get_nojournal(void)
12 {
13         handle_t *handle = current->journal_info;
14         unsigned long ref_cnt = (unsigned long)handle;
15
16         BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
17
18         ref_cnt++;
19         handle = (handle_t *)ref_cnt;
20
21         current->journal_info = handle;
22         return handle;
23 }
24
25
26 /* Decrement the non-pointer handle value */
27 static void ext4_put_nojournal(handle_t *handle)
28 {
29         unsigned long ref_cnt = (unsigned long)handle;
30
31         BUG_ON(ref_cnt == 0);
32
33         ref_cnt--;
34         handle = (handle_t *)ref_cnt;
35
36         current->journal_info = handle;
37 }
38
39 /*
40  * Wrappers for jbd2_journal_start/end.
41  */
42 static int ext4_journal_check_start(struct super_block *sb)
43 {
44         journal_t *journal;
45
46         might_sleep();
47
48         if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
49                 return -EIO;
50
51         if (sb_rdonly(sb))
52                 return -EROFS;
53         WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
54         journal = EXT4_SB(sb)->s_journal;
55         /*
56          * Special case here: if the journal has aborted behind our
57          * backs (eg. EIO in the commit thread), then we still need to
58          * take the FS itself readonly cleanly.
59          */
60         if (journal && is_journal_aborted(journal)) {
61                 ext4_abort(sb, "Detected aborted journal");
62                 return -EROFS;
63         }
64         return 0;
65 }
66
67 handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
68                                   int type, int blocks, int rsv_blocks)
69 {
70         journal_t *journal;
71         int err;
72
73         trace_ext4_journal_start(sb, blocks, rsv_blocks, _RET_IP_);
74         err = ext4_journal_check_start(sb);
75         if (err < 0)
76                 return ERR_PTR(err);
77
78         journal = EXT4_SB(sb)->s_journal;
79         if (!journal)
80                 return ext4_get_nojournal();
81         return jbd2__journal_start(journal, blocks, rsv_blocks, GFP_NOFS,
82                                    type, line);
83 }
84
85 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
86 {
87         struct super_block *sb;
88         int err;
89         int rc;
90
91         if (!ext4_handle_valid(handle)) {
92                 ext4_put_nojournal(handle);
93                 return 0;
94         }
95
96         err = handle->h_err;
97         if (!handle->h_transaction) {
98                 rc = jbd2_journal_stop(handle);
99                 return err ? err : rc;
100         }
101
102         sb = handle->h_transaction->t_journal->j_private;
103         rc = jbd2_journal_stop(handle);
104
105         if (!err)
106                 err = rc;
107         if (err)
108                 __ext4_std_error(sb, where, line, err);
109         return err;
110 }
111
112 handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
113                                         int type)
114 {
115         struct super_block *sb;
116         int err;
117
118         if (!ext4_handle_valid(handle))
119                 return ext4_get_nojournal();
120
121         sb = handle->h_journal->j_private;
122         trace_ext4_journal_start_reserved(sb, handle->h_buffer_credits,
123                                           _RET_IP_);
124         err = ext4_journal_check_start(sb);
125         if (err < 0) {
126                 jbd2_journal_free_reserved(handle);
127                 return ERR_PTR(err);
128         }
129
130         err = jbd2_journal_start_reserved(handle, type, line);
131         if (err < 0)
132                 return ERR_PTR(err);
133         return handle;
134 }
135
136 static void ext4_journal_abort_handle(const char *caller, unsigned int line,
137                                       const char *err_fn,
138                                       struct buffer_head *bh,
139                                       handle_t *handle, int err)
140 {
141         char nbuf[16];
142         const char *errstr = ext4_decode_error(NULL, err, nbuf);
143
144         BUG_ON(!ext4_handle_valid(handle));
145
146         if (bh)
147                 BUFFER_TRACE(bh, "abort");
148
149         if (!handle->h_err)
150                 handle->h_err = err;
151
152         if (is_handle_aborted(handle))
153                 return;
154
155         printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
156                caller, line, errstr, err_fn);
157
158         jbd2_journal_abort_handle(handle);
159 }
160
161 int __ext4_journal_get_write_access(const char *where, unsigned int line,
162                                     handle_t *handle, struct buffer_head *bh)
163 {
164         int err = 0;
165
166         might_sleep();
167
168         if (ext4_handle_valid(handle)) {
169                 err = jbd2_journal_get_write_access(handle, bh);
170                 if (err)
171                         ext4_journal_abort_handle(where, line, __func__, bh,
172                                                   handle, err);
173         }
174         return err;
175 }
176
177 /*
178  * The ext4 forget function must perform a revoke if we are freeing data
179  * which has been journaled.  Metadata (eg. indirect blocks) must be
180  * revoked in all cases.
181  *
182  * "bh" may be NULL: a metadata block may have been freed from memory
183  * but there may still be a record of it in the journal, and that record
184  * still needs to be revoked.
185  *
186  * If the handle isn't valid we're not journaling, but we still need to
187  * call into ext4_journal_revoke() to put the buffer head.
188  */
189 int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
190                   int is_metadata, struct inode *inode,
191                   struct buffer_head *bh, ext4_fsblk_t blocknr)
192 {
193         int err;
194
195         might_sleep();
196
197         trace_ext4_forget(inode, is_metadata, blocknr);
198         BUFFER_TRACE(bh, "enter");
199
200         jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
201                   "data mode %x\n",
202                   bh, is_metadata, inode->i_mode,
203                   test_opt(inode->i_sb, DATA_FLAGS));
204
205         /* In the no journal case, we can just do a bforget and return */
206         if (!ext4_handle_valid(handle)) {
207                 bforget(bh);
208                 return 0;
209         }
210
211         /* Never use the revoke function if we are doing full data
212          * journaling: there is no need to, and a V1 superblock won't
213          * support it.  Otherwise, only skip the revoke on un-journaled
214          * data blocks. */
215
216         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
217             (!is_metadata && !ext4_should_journal_data(inode))) {
218                 if (bh) {
219                         BUFFER_TRACE(bh, "call jbd2_journal_forget");
220                         err = jbd2_journal_forget(handle, bh);
221                         if (err)
222                                 ext4_journal_abort_handle(where, line, __func__,
223                                                           bh, handle, err);
224                         return err;
225                 }
226                 return 0;
227         }
228
229         /*
230          * data!=journal && (is_metadata || should_journal_data(inode))
231          */
232         BUFFER_TRACE(bh, "call jbd2_journal_revoke");
233         err = jbd2_journal_revoke(handle, blocknr, bh);
234         if (err) {
235                 ext4_journal_abort_handle(where, line, __func__,
236                                           bh, handle, err);
237                 __ext4_abort(inode->i_sb, where, line,
238                            "error %d when attempting revoke", err);
239         }
240         BUFFER_TRACE(bh, "exit");
241         return err;
242 }
243
244 int __ext4_journal_get_create_access(const char *where, unsigned int line,
245                                 handle_t *handle, struct buffer_head *bh)
246 {
247         int err = 0;
248
249         if (ext4_handle_valid(handle)) {
250                 err = jbd2_journal_get_create_access(handle, bh);
251                 if (err)
252                         ext4_journal_abort_handle(where, line, __func__,
253                                                   bh, handle, err);
254         }
255         return err;
256 }
257
258 int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
259                                  handle_t *handle, struct inode *inode,
260                                  struct buffer_head *bh)
261 {
262         int err = 0;
263
264         might_sleep();
265
266         set_buffer_meta(bh);
267         set_buffer_prio(bh);
268         if (ext4_handle_valid(handle)) {
269                 err = jbd2_journal_dirty_metadata(handle, bh);
270                 /* Errors can only happen due to aborted journal or a nasty bug */
271                 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
272                         ext4_journal_abort_handle(where, line, __func__, bh,
273                                                   handle, err);
274                         if (inode == NULL) {
275                                 pr_err("EXT4: jbd2_journal_dirty_metadata "
276                                        "failed: handle type %u started at "
277                                        "line %u, 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);
282                                 return err;
283                         }
284                         ext4_error_inode(inode, where, line,
285                                          bh->b_blocknr,
286                                          "journal_dirty_metadata failed: "
287                                          "handle type %u started at line %u, "
288                                          "credits %u/%u, errcode %d",
289                                          handle->h_type,
290                                          handle->h_line_no,
291                                          handle->h_requested_credits,
292                                          handle->h_buffer_credits, err);
293                 }
294         } else {
295                 if (inode)
296                         mark_buffer_dirty_inode(bh, inode);
297                 else
298                         mark_buffer_dirty(bh);
299                 if (inode && inode_needs_sync(inode)) {
300                         sync_dirty_buffer(bh);
301                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
302                                 struct ext4_super_block *es;
303
304                                 es = EXT4_SB(inode->i_sb)->s_es;
305                                 es->s_last_error_block =
306                                         cpu_to_le64(bh->b_blocknr);
307                                 ext4_error_inode(inode, where, line,
308                                                  bh->b_blocknr,
309                                         "IO error syncing itable block");
310                                 err = -EIO;
311                         }
312                 }
313         }
314         return err;
315 }
316
317 int __ext4_handle_dirty_super(const char *where, unsigned int line,
318                               handle_t *handle, struct super_block *sb)
319 {
320         struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
321         int err = 0;
322
323         ext4_superblock_csum_set(sb);
324         if (ext4_handle_valid(handle)) {
325                 err = jbd2_journal_dirty_metadata(handle, bh);
326                 if (err)
327                         ext4_journal_abort_handle(where, line, __func__,
328                                                   bh, handle, err);
329         } else
330                 mark_buffer_dirty(bh);
331         return err;
332 }