2 * Interface between ext4 and JBD
7 #include <trace/events/ext4.h>
9 /* Just increment the non-pointer handle value */
10 static handle_t *ext4_get_nojournal(void)
12 handle_t *handle = current->journal_info;
13 unsigned long ref_cnt = (unsigned long)handle;
15 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
18 handle = (handle_t *)ref_cnt;
20 current->journal_info = handle;
25 /* Decrement the non-pointer handle value */
26 static void ext4_put_nojournal(handle_t *handle)
28 unsigned long ref_cnt = (unsigned long)handle;
33 handle = (handle_t *)ref_cnt;
35 current->journal_info = handle;
39 * Wrappers for jbd2_journal_start/end.
41 static int ext4_journal_check_start(struct super_block *sb)
47 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
50 if (sb->s_flags & MS_RDONLY)
52 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
53 journal = EXT4_SB(sb)->s_journal;
55 * Special case here: if the journal has aborted behind our
56 * backs (eg. EIO in the commit thread), then we still need to
57 * take the FS itself readonly cleanly.
59 if (journal && is_journal_aborted(journal)) {
60 ext4_abort(sb, "Detected aborted journal");
66 handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
67 int type, int blocks, int rsv_blocks)
72 trace_ext4_journal_start(sb, blocks, rsv_blocks, _RET_IP_);
73 err = ext4_journal_check_start(sb);
77 journal = EXT4_SB(sb)->s_journal;
79 return ext4_get_nojournal();
80 return jbd2__journal_start(journal, blocks, rsv_blocks, GFP_NOFS,
84 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
86 struct super_block *sb;
90 if (!ext4_handle_valid(handle)) {
91 ext4_put_nojournal(handle);
96 if (!handle->h_transaction) {
97 rc = jbd2_journal_stop(handle);
98 return err ? err : rc;
101 sb = handle->h_transaction->t_journal->j_private;
102 rc = jbd2_journal_stop(handle);
107 __ext4_std_error(sb, where, line, err);
111 handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
114 struct super_block *sb;
117 if (!ext4_handle_valid(handle))
118 return ext4_get_nojournal();
120 sb = handle->h_journal->j_private;
121 trace_ext4_journal_start_reserved(sb, handle->h_buffer_credits,
123 err = ext4_journal_check_start(sb);
125 jbd2_journal_free_reserved(handle);
129 err = jbd2_journal_start_reserved(handle, type, line);
135 static void ext4_journal_abort_handle(const char *caller, unsigned int line,
137 struct buffer_head *bh,
138 handle_t *handle, int err)
141 const char *errstr = ext4_decode_error(NULL, err, nbuf);
143 BUG_ON(!ext4_handle_valid(handle));
146 BUFFER_TRACE(bh, "abort");
151 if (is_handle_aborted(handle))
154 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
155 caller, line, errstr, err_fn);
157 jbd2_journal_abort_handle(handle);
160 int __ext4_journal_get_write_access(const char *where, unsigned int line,
161 handle_t *handle, struct buffer_head *bh)
167 if (ext4_handle_valid(handle)) {
168 struct super_block *sb;
170 sb = handle->h_transaction->t_journal->j_private;
171 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb)))) {
172 jbd2_journal_abort_handle(handle);
175 err = jbd2_journal_get_write_access(handle, bh);
177 ext4_journal_abort_handle(where, line, __func__, bh,
184 * The ext4 forget function must perform a revoke if we are freeing data
185 * which has been journaled. Metadata (eg. indirect blocks) must be
186 * revoked in all cases.
188 * "bh" may be NULL: a metadata block may have been freed from memory
189 * but there may still be a record of it in the journal, and that record
190 * still needs to be revoked.
192 * If the handle isn't valid we're not journaling, but we still need to
193 * call into ext4_journal_revoke() to put the buffer head.
195 int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
196 int is_metadata, struct inode *inode,
197 struct buffer_head *bh, ext4_fsblk_t blocknr)
203 trace_ext4_forget(inode, is_metadata, blocknr);
204 BUFFER_TRACE(bh, "enter");
206 jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
208 bh, is_metadata, inode->i_mode,
209 test_opt(inode->i_sb, DATA_FLAGS));
211 /* In the no journal case, we can just do a bforget and return */
212 if (!ext4_handle_valid(handle)) {
217 /* Never use the revoke function if we are doing full data
218 * journaling: there is no need to, and a V1 superblock won't
219 * support it. Otherwise, only skip the revoke on un-journaled
222 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
223 (!is_metadata && !ext4_should_journal_data(inode))) {
225 BUFFER_TRACE(bh, "call jbd2_journal_forget");
226 err = jbd2_journal_forget(handle, bh);
228 ext4_journal_abort_handle(where, line, __func__,
236 * data!=journal && (is_metadata || should_journal_data(inode))
238 BUFFER_TRACE(bh, "call jbd2_journal_revoke");
239 err = jbd2_journal_revoke(handle, blocknr, bh);
241 ext4_journal_abort_handle(where, line, __func__,
243 __ext4_abort(inode->i_sb, where, line,
244 "error %d when attempting revoke", err);
246 BUFFER_TRACE(bh, "exit");
250 int __ext4_journal_get_create_access(const char *where, unsigned int line,
251 handle_t *handle, struct buffer_head *bh)
255 if (ext4_handle_valid(handle)) {
256 err = jbd2_journal_get_create_access(handle, bh);
258 ext4_journal_abort_handle(where, line, __func__,
264 int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
265 handle_t *handle, struct inode *inode,
266 struct buffer_head *bh)
274 if (ext4_handle_valid(handle)) {
275 err = jbd2_journal_dirty_metadata(handle, bh);
276 /* Errors can only happen due to aborted journal or a nasty bug */
277 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
278 ext4_journal_abort_handle(where, line, __func__, bh,
281 pr_err("EXT4: jbd2_journal_dirty_metadata "
282 "failed: handle type %u started at "
283 "line %u, credits %u/%u, errcode %d",
286 handle->h_requested_credits,
287 handle->h_buffer_credits, err);
290 ext4_error_inode(inode, where, line,
292 "journal_dirty_metadata failed: "
293 "handle type %u started at line %u, "
294 "credits %u/%u, errcode %d",
297 handle->h_requested_credits,
298 handle->h_buffer_credits, err);
302 mark_buffer_dirty_inode(bh, inode);
304 mark_buffer_dirty(bh);
305 if (inode && inode_needs_sync(inode)) {
306 sync_dirty_buffer(bh);
307 if (buffer_req(bh) && !buffer_uptodate(bh)) {
308 struct ext4_super_block *es;
310 es = EXT4_SB(inode->i_sb)->s_es;
311 es->s_last_error_block =
312 cpu_to_le64(bh->b_blocknr);
313 ext4_error_inode(inode, where, line,
315 "IO error syncing itable block");
323 int __ext4_handle_dirty_super(const char *where, unsigned int line,
324 handle_t *handle, struct super_block *sb)
326 struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
329 ext4_superblock_csum_set(sb);
330 if (ext4_handle_valid(handle)) {
331 err = jbd2_journal_dirty_metadata(handle, bh);
333 ext4_journal_abort_handle(where, line, __func__,
336 mark_buffer_dirty(bh);