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-rw-r--r--fs/jbd/commit.c29
1 files changed, 20 insertions, 9 deletions
diff --git a/fs/jbd/commit.c b/fs/jbd/commit.c
index 5a8ca61498c..f943b9b3f20 100644
--- a/fs/jbd/commit.c
+++ b/fs/jbd/commit.c
@@ -36,7 +36,7 @@ static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
/*
* When an ext3-ordered file is truncated, it is possible that many pages are
- * not sucessfully freed, because they are attached to a committing transaction.
+ * not successfully freed, because they are attached to a committing transaction.
* After the transaction commits, these pages are left on the LRU, with no
* ->mapping, and with attached buffers. These pages are trivially reclaimable
* by the VM, but their apparent absence upsets the VM accounting, and it makes
@@ -45,8 +45,8 @@ static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
* So here, we have a buffer which has just come off the forget list. Look to
* see if we can strip all buffers from the backing page.
*
- * Called under lock_journal(), and possibly under journal_datalist_lock. The
- * caller provided us with a ref against the buffer, and we drop that here.
+ * Called under journal->j_list_lock. The caller provided us with a ref
+ * against the buffer, and we drop that here.
*/
static void release_buffer_page(struct buffer_head *bh)
{
@@ -78,6 +78,19 @@ nope:
}
/*
+ * Decrement reference counter for data buffer. If it has been marked
+ * 'BH_Freed', release it and the page to which it belongs if possible.
+ */
+static void release_data_buffer(struct buffer_head *bh)
+{
+ if (buffer_freed(bh)) {
+ clear_buffer_freed(bh);
+ release_buffer_page(bh);
+ } else
+ put_bh(bh);
+}
+
+/*
* Try to acquire jbd_lock_bh_state() against the buffer, when j_list_lock is
* held. For ranking reasons we must trylock. If we lose, schedule away and
* return 0. j_list_lock is dropped in this case.
@@ -231,7 +244,7 @@ write_out_data:
if (locked)
unlock_buffer(bh);
BUFFER_TRACE(bh, "already cleaned up");
- put_bh(bh);
+ release_data_buffer(bh);
continue;
}
if (locked && test_clear_buffer_dirty(bh)) {
@@ -258,10 +271,10 @@ write_out_data:
if (locked)
unlock_buffer(bh);
journal_remove_journal_head(bh);
- /* Once for our safety reference, once for
+ /* One for our safety reference, other for
* journal_remove_journal_head() */
put_bh(bh);
- put_bh(bh);
+ release_data_buffer(bh);
}
if (need_resched() || spin_needbreak(&journal->j_list_lock)) {
@@ -443,7 +456,7 @@ void journal_commit_transaction(journal_t *journal)
} else {
jbd_unlock_bh_state(bh);
}
- put_bh(bh);
+ release_data_buffer(bh);
cond_resched_lock(&journal->j_list_lock);
}
spin_unlock(&journal->j_list_lock);
@@ -453,8 +466,6 @@ void journal_commit_transaction(journal_t *journal)
journal_write_revoke_records(journal, commit_transaction);
- jbd_debug(3, "JBD: commit phase 2\n");
-
/*
* If we found any dirty or locked buffers, then we should have
* looped back up to the write_out_data label. If there weren't