Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/fs/ext4/ext4_jbd2.c

  1 /*
  2  * Interface between ext4 and JBD
  3  */
  4 
  5 #include "ext4_jbd2.h"
  6 
  7 #include <trace/events/ext4.h>
  8 
  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  */
 41 static int ext4_journal_check_start(struct super_block *sb)
 42 {
 43         journal_t *journal;
 44 
 45         might_sleep();
 46         if (sb->s_flags & MS_RDONLY)
 47                 return -EROFS;
 48         WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
 49         journal = EXT4_SB(sb)->s_journal;
 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          */
 55         if (journal && is_journal_aborted(journal)) {
 56                 ext4_abort(sb, "Detected aborted journal");
 57                 return -EROFS;
 58         }
 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);
 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 
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 
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)
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 
150 int __ext4_journal_get_write_access(const char *where, unsigned int line,
151                                     handle_t *handle, struct buffer_head *bh)
152 {
153         int err = 0;
154 
155         might_sleep();
156 
157         if (ext4_handle_valid(handle)) {
158                 err = jbd2_journal_get_write_access(handle, bh);
159                 if (err)
160                         ext4_journal_abort_handle(where, line, __func__, bh,
161                                                   handle, err);
162         }
163         return err;
164 }
165 
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  */
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)
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 
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 
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");
209                         err = jbd2_journal_forget(handle, bh);
210                         if (err)
211                                 ext4_journal_abort_handle(where, line, __func__,
212                                                           bh, handle, err);
213                         return err;
214                 }
215                 return 0;
216         }
217 
218         /*
219          * data!=journal && (is_metadata || should_journal_data(inode))
220          */
221         BUFFER_TRACE(bh, "call jbd2_journal_revoke");
222         err = jbd2_journal_revoke(handle, blocknr, bh);
223         if (err) {
224                 ext4_journal_abort_handle(where, line, __func__,
225                                           bh, handle, err);
226                 __ext4_abort(inode->i_sb, where, line,
227                            "error %d when attempting revoke", err);
228         }
229         BUFFER_TRACE(bh, "exit");
230         return err;
231 }
232 
233 int __ext4_journal_get_create_access(const char *where, unsigned int line,
234                                 handle_t *handle, struct buffer_head *bh)
235 {
236         int err = 0;
237 
238         if (ext4_handle_valid(handle)) {
239                 err = jbd2_journal_get_create_access(handle, bh);
240                 if (err)
241                         ext4_journal_abort_handle(where, line, __func__,
242                                                   bh, handle, err);
243         }
244         return err;
245 }
246 
247 int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
248                                  handle_t *handle, struct inode *inode,
249                                  struct buffer_head *bh)
250 {
251         int err = 0;
252 
253         might_sleep();
254 
255         set_buffer_meta(bh);
256         set_buffer_prio(bh);
257         if (ext4_handle_valid(handle)) {
258                 err = jbd2_journal_dirty_metadata(handle, bh);
259                 /* Errors can only happen due to aborted journal or a nasty bug */
260                 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
261                         ext4_journal_abort_handle(where, line, __func__, bh,
262                                                   handle, err);
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                         }
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);
282                 }
283         } else {
284                 if (inode)
285                         mark_buffer_dirty_inode(bh, inode);
286                 else
287                         mark_buffer_dirty(bh);
288                 if (inode && inode_needs_sync(inode)) {
289                         sync_dirty_buffer(bh);
290                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
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);
296                                 ext4_error_inode(inode, where, line,
297                                                  bh->b_blocknr,
298                                         "IO error syncing itable block");
299                                 err = -EIO;
300                         }
301                 }
302         }
303         return err;
304 }
305 
306 int __ext4_handle_dirty_super(const char *where, unsigned int line,
307                               handle_t *handle, struct super_block *sb)
308 {
309         struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
310         int err = 0;
311 
312         ext4_superblock_csum_set(sb);
313         if (ext4_handle_valid(handle)) {
314                 err = jbd2_journal_dirty_metadata(handle, bh);
315                 if (err)
316                         ext4_journal_abort_handle(where, line, __func__,
317                                                   bh, handle, err);
318         } else
319                 mark_buffer_dirty(bh);
320         return err;
321 }
322 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us