diff options
| author | Andrew Morton | 2007-10-16 23:30:36 -0700 |
|---|---|---|
| committer | Linus Torvalds | 2007-10-17 08:43:02 -0700 |
| commit | c6945e77e477103057b4a639b4b01596f5257861 (patch) | |
| tree | 02e6b473143060cdec08f3d8447512d56ea699bd | |
| parent | 1b43ef91d40190b16ba10218e66d5c2c4ba11de3 (diff) | |
writeback: fix time ordering of the per superblock dirty inode lists 5
When the writeback function is operating in writeback-for-flushing mode (as
opposed to writeback-for-integrity) and it encounters an I_LOCKed inode, it
will skip writing that inode. This is done for throughput and latency: move
on to another inode rather than blocking for this one.
Writeback skips this inode by moving it off s_io and onto s_dirty, so that
writeback can proceed with the other inodes on s_io.
However that inode movement can corrupt s_dirty's reverse-time-orderedness.
Fix that by using the new redirty_tail(), which will update the refiled
inode's dirtied_when field.
Note: the behaviour in here is a bit rude: if kupdate happens to come across a
locked inode then it will defer writeback of that inode for another 30
seconds. We'll address that in the next patch.
Cc: Mike Waychison <mikew@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/fs-writeback.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index a3d7a829137d..1b43cc9d9ebb 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -308,7 +308,7 @@ __writeback_single_inode(struct inode *inode, struct writeback_control *wbc) struct address_space *mapping = inode->i_mapping; int ret; - list_move(&inode->i_list, &inode->i_sb->s_dirty); + redirty_tail(inode); /* * Even if we don't actually write the inode itself here, |