path: root/fs/ext3/inode.c
diff options
authorJan Kara <jack@suse.cz>2010-08-05 12:38:26 +0200
committerJan Kara <jack@suse.cz>2010-08-05 21:28:28 +0200
commit5f11e6a44059f728dddd8d0dbe5b4368ea93575b (patch)
treec66eed7a13b1de48d9a6539b9a7c7a27bda706c6 /fs/ext3/inode.c
parentaa32a796389bedbcf1c7714385b18714a0743810 (diff)
ext3: Fix dirtying of journalled buffers in data=journal mode
In data=journal mode, we still use block_write_begin() to prepare page for writing. This function can occasionally mark buffer dirty which violates journalling assumptions - when a buffer is part of a transaction, it should be dirty and a buffer can be already part of a forget list of some transaction when block_write_begin() gets called. This violation of journalling assumptions then results in "JBD: Spotted dirty metadata buffer..." warnings. In fact, temporary dirtying the buffer while the page is still locked does not really cause problems to the journalling because we won't write the buffer until the page gets unlocked. So we just have to make sure to clear dirty bits before unlocking the page. Reviewed-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext3/inode.c')
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 436e5bbccbc..001eb0e2d48 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1149,9 +1149,25 @@ static int walk_page_buffers( handle_t *handle,
static int do_journal_get_write_access(handle_t *handle,
struct buffer_head *bh)
+ int dirty = buffer_dirty(bh);
+ int ret;
if (!buffer_mapped(bh) || buffer_freed(bh))
return 0;
- return ext3_journal_get_write_access(handle, bh);
+ /*
+ * __block_prepare_write() could have dirtied some buffers. Clean
+ * the dirty bit as jbd2_journal_get_write_access() could complain
+ * otherwise about fs integrity issues. Setting of the dirty bit
+ * by __block_prepare_write() isn't a real problem here as we clear
+ * the bit before releasing a page lock and thus writeback cannot
+ * ever write the buffer.
+ */
+ if (dirty)
+ clear_buffer_dirty(bh);
+ ret = ext3_journal_get_write_access(handle, bh);
+ if (!ret && dirty)
+ ret = ext3_journal_dirty_metadata(handle, bh);
+ return ret;