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Andrew Morton8984d132006-12-06 20:37:15 -08001/*
2 * Interface between ext4 and JBD
3 */
4
Christoph Hellwig3dcf5452008-04-29 18:13:32 -04005#include "ext4_jbd2.h"
Andrew Morton8984d132006-12-06 20:37:15 -08006
Theodore Ts'od6797d12009-11-22 20:52:12 -05007#include <trace/events/ext4.h>
8
Theodore Ts'o722887d2013-02-08 13:00:31 -05009/* Just increment the non-pointer handle value */
10static 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 */
26static 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 */
Jan Kara5fe2fe82013-06-04 12:37:50 -040041static int ext4_journal_check_start(struct super_block *sb)
Theodore Ts'o722887d2013-02-08 13:00:31 -050042{
43 journal_t *journal;
44
Theodore Ts'ob10a44c2013-04-03 22:00:52 -040045 might_sleep();
Theodore Ts'o722887d2013-02-08 13:00:31 -050046 if (sb->s_flags & MS_RDONLY)
Jan Kara5fe2fe82013-06-04 12:37:50 -040047 return -EROFS;
Theodore Ts'o722887d2013-02-08 13:00:31 -050048 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
49 journal = EXT4_SB(sb)->s_journal;
Theodore Ts'o722887d2013-02-08 13:00:31 -050050 /*
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 */
Jan Kara5fe2fe82013-06-04 12:37:50 -040055 if (journal && is_journal_aborted(journal)) {
Theodore Ts'o722887d2013-02-08 13:00:31 -050056 ext4_abort(sb, "Detected aborted journal");
Jan Kara5fe2fe82013-06-04 12:37:50 -040057 return -EROFS;
Theodore Ts'o722887d2013-02-08 13:00:31 -050058 }
Jan Kara5fe2fe82013-06-04 12:37:50 -040059 return 0;
60}
61
62handle_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);
Theodore Ts'o722887d2013-02-08 13:00:31 -050078}
79
80int __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
Jan Kara5fe2fe82013-06-04 12:37:50 -0400101handle_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
Theodore Ts'o722887d2013-02-08 13:00:31 -0500125void ext4_journal_abort_handle(const char *caller, unsigned int line,
126 const char *err_fn, struct buffer_head *bh,
127 handle_t *handle, int err)
128{
129 char nbuf[16];
130 const char *errstr = ext4_decode_error(NULL, err, nbuf);
131
132 BUG_ON(!ext4_handle_valid(handle));
133
134 if (bh)
135 BUFFER_TRACE(bh, "abort");
136
137 if (!handle->h_err)
138 handle->h_err = err;
139
140 if (is_handle_aborted(handle))
141 return;
142
143 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
144 caller, line, errstr, err_fn);
145
146 jbd2_journal_abort_handle(handle);
147}
148
Theodore Ts'o90c72012010-06-29 14:53:24 -0400149int __ext4_journal_get_write_access(const char *where, unsigned int line,
150 handle_t *handle, struct buffer_head *bh)
Andrew Morton8984d132006-12-06 20:37:15 -0800151{
Frank Mayhar03901312009-01-07 00:06:22 -0500152 int err = 0;
153
Theodore Ts'ob10a44c2013-04-03 22:00:52 -0400154 might_sleep();
155
Frank Mayhar03901312009-01-07 00:06:22 -0500156 if (ext4_handle_valid(handle)) {
157 err = jbd2_journal_get_write_access(handle, bh);
158 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -0400159 ext4_journal_abort_handle(where, line, __func__, bh,
Frank Mayhar03901312009-01-07 00:06:22 -0500160 handle, err);
161 }
Andrew Morton8984d132006-12-06 20:37:15 -0800162 return err;
163}
164
Theodore Ts'od6797d12009-11-22 20:52:12 -0500165/*
166 * The ext4 forget function must perform a revoke if we are freeing data
167 * which has been journaled. Metadata (eg. indirect blocks) must be
168 * revoked in all cases.
169 *
170 * "bh" may be NULL: a metadata block may have been freed from memory
171 * but there may still be a record of it in the journal, and that record
172 * still needs to be revoked.
173 *
174 * If the handle isn't valid we're not journaling, but we still need to
175 * call into ext4_journal_revoke() to put the buffer head.
176 */
Theodore Ts'o90c72012010-06-29 14:53:24 -0400177int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
178 int is_metadata, struct inode *inode,
179 struct buffer_head *bh, ext4_fsblk_t blocknr)
Theodore Ts'od6797d12009-11-22 20:52:12 -0500180{
181 int err;
182
183 might_sleep();
184
185 trace_ext4_forget(inode, is_metadata, blocknr);
186 BUFFER_TRACE(bh, "enter");
187
188 jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
189 "data mode %x\n",
190 bh, is_metadata, inode->i_mode,
191 test_opt(inode->i_sb, DATA_FLAGS));
192
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500193 /* In the no journal case, we can just do a bforget and return */
194 if (!ext4_handle_valid(handle)) {
195 bforget(bh);
196 return 0;
197 }
198
Theodore Ts'od6797d12009-11-22 20:52:12 -0500199 /* Never use the revoke function if we are doing full data
200 * journaling: there is no need to, and a V1 superblock won't
201 * support it. Otherwise, only skip the revoke on un-journaled
202 * data blocks. */
203
204 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
205 (!is_metadata && !ext4_should_journal_data(inode))) {
206 if (bh) {
207 BUFFER_TRACE(bh, "call jbd2_journal_forget");
Theodore Ts'ob7e57e72009-11-22 21:00:13 -0500208 err = jbd2_journal_forget(handle, bh);
209 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -0400210 ext4_journal_abort_handle(where, line, __func__,
211 bh, handle, err);
Theodore Ts'ob7e57e72009-11-22 21:00:13 -0500212 return err;
Theodore Ts'od6797d12009-11-22 20:52:12 -0500213 }
214 return 0;
215 }
216
217 /*
218 * data!=journal && (is_metadata || should_journal_data(inode))
219 */
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500220 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
221 err = jbd2_journal_revoke(handle, blocknr, bh);
222 if (err) {
Theodore Ts'o90c72012010-06-29 14:53:24 -0400223 ext4_journal_abort_handle(where, line, __func__,
224 bh, handle, err);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400225 __ext4_abort(inode->i_sb, where, line,
226 "error %d when attempting revoke", err);
Theodore Ts'oe4684b32009-11-24 11:05:59 -0500227 }
Theodore Ts'od6797d12009-11-22 20:52:12 -0500228 BUFFER_TRACE(bh, "exit");
229 return err;
230}
231
Theodore Ts'o90c72012010-06-29 14:53:24 -0400232int __ext4_journal_get_create_access(const char *where, unsigned int line,
Andrew Morton8984d132006-12-06 20:37:15 -0800233 handle_t *handle, struct buffer_head *bh)
234{
Frank Mayhar03901312009-01-07 00:06:22 -0500235 int err = 0;
236
237 if (ext4_handle_valid(handle)) {
238 err = jbd2_journal_get_create_access(handle, bh);
239 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -0400240 ext4_journal_abort_handle(where, line, __func__,
241 bh, handle, err);
Frank Mayhar03901312009-01-07 00:06:22 -0500242 }
Andrew Morton8984d132006-12-06 20:37:15 -0800243 return err;
244}
245
Theodore Ts'o90c72012010-06-29 14:53:24 -0400246int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
247 handle_t *handle, struct inode *inode,
248 struct buffer_head *bh)
Andrew Morton8984d132006-12-06 20:37:15 -0800249{
Frank Mayhar03901312009-01-07 00:06:22 -0500250 int err = 0;
251
Theodore Ts'ob10a44c2013-04-03 22:00:52 -0400252 might_sleep();
253
Theodore Ts'o13fca322013-04-21 16:45:54 -0400254 set_buffer_meta(bh);
255 set_buffer_prio(bh);
Frank Mayhar03901312009-01-07 00:06:22 -0500256 if (ext4_handle_valid(handle)) {
257 err = jbd2_journal_dirty_metadata(handle, bh);
Theodore Ts'o9ea7a0d2011-09-04 10:18:14 -0400258 if (err) {
259 /* Errors can only happen if there is a bug */
260 handle->h_err = err;
261 __ext4_journal_stop(where, line, handle);
262 }
Frank Mayhar03901312009-01-07 00:06:22 -0500263 } else {
Curt Wohlgemuth73b50c12010-02-16 15:06:29 -0500264 if (inode)
Theodore Ts'ofe188c02009-09-12 13:41:55 -0400265 mark_buffer_dirty_inode(bh, inode);
266 else
267 mark_buffer_dirty(bh);
Frank Mayhar03901312009-01-07 00:06:22 -0500268 if (inode && inode_needs_sync(inode)) {
269 sync_dirty_buffer(bh);
270 if (buffer_req(bh) && !buffer_uptodate(bh)) {
Theodore Ts'o1c13d5c2010-07-27 11:56:03 -0400271 struct ext4_super_block *es;
272
273 es = EXT4_SB(inode->i_sb)->s_es;
274 es->s_last_error_block =
275 cpu_to_le64(bh->b_blocknr);
Theodore Ts'oc398eda2010-07-27 11:56:40 -0400276 ext4_error_inode(inode, where, line,
277 bh->b_blocknr,
278 "IO error syncing itable block");
Frank Mayhar03901312009-01-07 00:06:22 -0500279 err = -EIO;
280 }
281 }
282 }
Andrew Morton8984d132006-12-06 20:37:15 -0800283 return err;
284}
Theodore Ts'oa0375152010-06-11 23:14:04 -0400285
Theodore Ts'o90c72012010-06-29 14:53:24 -0400286int __ext4_handle_dirty_super(const char *where, unsigned int line,
Artem Bityutskiyb50924c2012-07-22 20:37:31 -0400287 handle_t *handle, struct super_block *sb)
Theodore Ts'oa0375152010-06-11 23:14:04 -0400288{
289 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
290 int err = 0;
291
Theodore Ts'o06db49e2012-10-10 01:06:58 -0400292 ext4_superblock_csum_set(sb);
Theodore Ts'oa0375152010-06-11 23:14:04 -0400293 if (ext4_handle_valid(handle)) {
294 err = jbd2_journal_dirty_metadata(handle, bh);
295 if (err)
Theodore Ts'o90c72012010-06-29 14:53:24 -0400296 ext4_journal_abort_handle(where, line, __func__,
297 bh, handle, err);
Theodore Ts'o06db49e2012-10-10 01:06:58 -0400298 } else
Darrick J. Wonga9c473172012-04-29 18:29:10 -0400299 mark_buffer_dirty(bh);
Theodore Ts'oa0375152010-06-11 23:14:04 -0400300 return err;
301}