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-rw-r--r--fs/jbd2/transaction.c33
1 files changed, 20 insertions, 13 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index b320c1ba7fdc..799f96c67211 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -1211,11 +1211,12 @@ int jbd2_journal_get_undo_access(handle_t *handle, struct buffer_head *bh)
struct journal_head *jh;
char *committed_data = NULL;
- JBUFFER_TRACE(jh, "entry");
if (jbd2_write_access_granted(handle, bh, true))
return 0;
jh = jbd2_journal_add_journal_head(bh);
+ JBUFFER_TRACE(jh, "entry");
+
/*
* Do this first --- it can drop the journal lock, so we want to
* make sure that obtaining the committed_data is done
@@ -1326,15 +1327,17 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
if (is_handle_aborted(handle))
return -EROFS;
- if (!buffer_jbd(bh)) {
- ret = -EUCLEAN;
- goto out;
- }
+ if (!buffer_jbd(bh))
+ return -EUCLEAN;
+
/*
* We don't grab jh reference here since the buffer must be part
* of the running transaction.
*/
jh = bh2jh(bh);
+ jbd_debug(5, "journal_head %p\n", jh);
+ JBUFFER_TRACE(jh, "entry");
+
/*
* This and the following assertions are unreliable since we may see jh
* in inconsistent state unless we grab bh_state lock. But this is
@@ -1368,9 +1371,6 @@ int jbd2_journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
}
journal = transaction->t_journal;
- jbd_debug(5, "journal_head %p\n", jh);
- JBUFFER_TRACE(jh, "entry");
-
jbd_lock_bh_state(bh);
if (jh->b_modified == 0) {
@@ -1568,14 +1568,21 @@ int jbd2_journal_forget (handle_t *handle, struct buffer_head *bh)
/* However, if the buffer is still owned by a prior
* (committing) transaction, we can't drop it yet... */
JBUFFER_TRACE(jh, "belongs to older transaction");
- /* ... but we CAN drop it from the new transaction if we
- * have also modified it since the original commit. */
+ /* ... but we CAN drop it from the new transaction through
+ * marking the buffer as freed and set j_next_transaction to
+ * the new transaction, so that not only the commit code
+ * knows it should clear dirty bits when it is done with the
+ * buffer, but also the buffer can be checkpointed only
+ * after the new transaction commits. */
- if (jh->b_next_transaction) {
- J_ASSERT(jh->b_next_transaction == transaction);
+ set_buffer_freed(bh);
+
+ if (!jh->b_next_transaction) {
spin_lock(&journal->j_list_lock);
- jh->b_next_transaction = NULL;
+ jh->b_next_transaction = transaction;
spin_unlock(&journal->j_list_lock);
+ } else {
+ J_ASSERT(jh->b_next_transaction == transaction);
/*
* only drop a reference if this transaction modified