Replace redirty_tail() with requeue_io()/requeue_io_wait() when
there are more pages to sync. There won't be starvation.
Cc: Michael Rubin <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Signed-off-by: Fengguang Wu <[email protected]>
---
fs/fs-writeback.c | 43 ++++++++-----------------------------------
1 file changed, 8 insertions(+), 35 deletions(-)
--- linux-2.6.24-rc6-mm1.orig/fs/fs-writeback.c
+++ linux-2.6.24-rc6-mm1/fs/fs-writeback.c
@@ -273,46 +273,19 @@ __sync_single_inode(struct inode *inode,
if (!(inode->i_state & I_FREEING)) {
if (!(inode->i_state & I_DIRTY) &&
mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
/*
* We didn't write back all the pages. nfs_writepages()
- * sometimes bales out without doing anything. Redirty
- * the inode; Move it from s_io onto s_more_io/s_dirty.
+ * sometimes bales out without doing anything.
*/
- /*
- * akpm: if the caller was the kupdate function we put
- * this inode at the head of s_dirty so it gets first
- * consideration. Otherwise, move it to the tail, for
- * the reasons described there. I'm not really sure
- * how much sense this makes. Presumably I had a good
- * reasons for doing it this way, and I'd rather not
- * muck with it at present.
- */
- if (wbc->for_kupdate) {
- /*
- * For the kupdate function we move the inode
- * to s_more_io so it will get more writeout as
- * soon as the queue becomes uncongested.
- */
- inode->i_state |= I_DIRTY_PAGES;
- if (wbc->nr_to_write > 0)
- /* somehow blocked: wait and retry */
- requeue_io_wait(inode);
- else
- /* slice used up: queue for next turn */
- requeue_io(inode);
- } else {
- /*
- * Otherwise fully redirty the inode so that
- * other inodes on this superblock will get some
- * writeout. Otherwise heavy writing to one
- * file would indefinitely suspend writeout of
- * all the other files.
- */
- inode->i_state |= I_DIRTY_PAGES;
- redirty_tail(inode);
- }
+ inode->i_state |= I_DIRTY_PAGES;
+ if (wbc->nr_to_write > 0)
+ /* somehow blocked: wait and retry */
+ requeue_io_wait(inode);
+ else
+ /* slice used up: queue for next turn */
+ requeue_io(inode);
} else if (inode->i_state & I_DIRTY) {
/*
* Someone redirtied the inode while were writing back
* the pages.
*/
--
--
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