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authorTheodore Ts'o <tytso@mit.edu>2011-09-04 10:18:14 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-09-04 10:18:14 -0400
commit9ea7a0df63630ad8197716cd313ea66e28906fc0 (patch)
tree2f9cb8bb3f4c709aa666c7863b496f2757b261fb /fs/jbd2
parent56889787cfa77dfd96f0b3a3e6a4f26c2e4a5134 (diff)
downloadlinux-9ea7a0df63630ad8197716cd313ea66e28906fc0.tar.bz2
jbd2: add debugging information to jbd2_journal_dirty_metadata()
Add debugging information in case jbd2_journal_dirty_metadata() is called with a buffer_head which didn't have jbd2_journal_get_write_access() called on it, or if the journal_head has the wrong transaction in it. In addition, return an error code. This won't change anything for ocfs2, which will BUG_ON() the non-zero exit code. For ext4, the caller of this function is ext4_handle_dirty_metadata(), and on seeing a non-zero return code, will call __ext4_journal_stop(), which will print the function and line number of the (buggy) calling function and abort the journal. This will allow us to recover instead of bug halting, which is better from a robustness and reliability point of view. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/transaction.c58
1 files changed, 52 insertions, 6 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 2d7109414cdd..cb56fe9aaabb 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1049,6 +1049,10 @@ void jbd2_buffer_abort_trigger(struct journal_head *jh,
* mark dirty metadata which needs to be journaled as part of the current
* transaction.
*
+ * The buffer must have previously had jbd2_journal_get_write_access()
+ * called so that it has a valid journal_head attached to the buffer
+ * head.
+ *
* The buffer is placed on the transaction's metadata list and is marked
* as belonging to the transaction.
*
@@ -1065,11 +1069,16 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
transaction_t *transaction = handle->h_transaction;
journal_t *journal = transaction->t_journal;
struct journal_head *jh = bh2jh(bh);
+ int ret = 0;
jbd_debug(5, "journal_head %p\n", jh);
JBUFFER_TRACE(jh, "entry");
if (is_handle_aborted(handle))
goto out;
+ if (!buffer_jbd(bh)) {
+ ret = -EUCLEAN;
+ goto out;
+ }
jbd_lock_bh_state(bh);
@@ -1093,8 +1102,20 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
*/
if (jh->b_transaction == transaction && jh->b_jlist == BJ_Metadata) {
JBUFFER_TRACE(jh, "fastpath");
- J_ASSERT_JH(jh, jh->b_transaction ==
- journal->j_running_transaction);
+ if (unlikely(jh->b_transaction !=
+ journal->j_running_transaction)) {
+ printk(KERN_EMERG "JBD: %s: "
+ "jh->b_transaction (%llu, %p, %u) != "
+ "journal->j_running_transaction (%p, %u)",
+ journal->j_devname,
+ (unsigned long long) bh->b_blocknr,
+ jh->b_transaction,
+ jh->b_transaction ? jh->b_transaction->t_tid : 0,
+ journal->j_running_transaction,
+ journal->j_running_transaction ?
+ journal->j_running_transaction->t_tid : 0);
+ ret = -EINVAL;
+ }
goto out_unlock_bh;
}
@@ -1108,9 +1129,32 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
*/
if (jh->b_transaction != transaction) {
JBUFFER_TRACE(jh, "already on other transaction");
- J_ASSERT_JH(jh, jh->b_transaction ==
- journal->j_committing_transaction);
- J_ASSERT_JH(jh, jh->b_next_transaction == transaction);
+ if (unlikely(jh->b_transaction !=
+ journal->j_committing_transaction)) {
+ printk(KERN_EMERG "JBD: %s: "
+ "jh->b_transaction (%llu, %p, %u) != "
+ "journal->j_committing_transaction (%p, %u)",
+ journal->j_devname,
+ (unsigned long long) bh->b_blocknr,
+ jh->b_transaction,
+ jh->b_transaction ? jh->b_transaction->t_tid : 0,
+ journal->j_committing_transaction,
+ journal->j_committing_transaction ?
+ journal->j_committing_transaction->t_tid : 0);
+ ret = -EINVAL;
+ }
+ if (unlikely(jh->b_next_transaction != transaction)) {
+ printk(KERN_EMERG "JBD: %s: "
+ "jh->b_next_transaction (%llu, %p, %u) != "
+ "transaction (%p, %u)",
+ journal->j_devname,
+ (unsigned long long) bh->b_blocknr,
+ jh->b_next_transaction,
+ jh->b_next_transaction ?
+ jh->b_next_transaction->t_tid : 0,
+ transaction, transaction->t_tid);
+ ret = -EINVAL;
+ }
/* And this case is illegal: we can't reuse another
* transaction's data buffer, ever. */
goto out_unlock_bh;
@@ -1127,7 +1171,9 @@ out_unlock_bh:
jbd_unlock_bh_state(bh);
out:
JBUFFER_TRACE(jh, "exit");
- return 0;
+ if (ret)
+ __WARN(); /* All errors are bugs, so dump the stack */
+ return ret;
}
/*