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authorWu Fengguang <fengguang.wu@intel.com>2010-08-11 14:17:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-12 08:43:30 -0700
commit23539afc71937dbaca7de2229669f4475ff4ea7b (patch)
tree1a37d78bc4d387c6cbdc201755dce09297ebe308
parent1babe18385d3976043c04237ce837f3736197eb4 (diff)
downloadlinux-23539afc71937dbaca7de2229669f4475ff4ea7b.tar.bz2
writeback: don't redirty tail an inode with dirty pages
Avoid delaying writeback for an expire inode with lots of dirty pages, but no active dirtier at the moment. Previously we only do that for the kupdate case. Any filesystem that does delayed allocation or unwritten extent conversion after IO completion will cause this - for example, XFS. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Jan Kara <jack@suse.cz> Cc: Dave Chinner <david@fromorbit.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/fs-writeback.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index fca43d4d7bf4..1ce364bbb003 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -363,18 +363,7 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
spin_lock(&inode_lock);
inode->i_state &= ~I_SYNC;
if (!(inode->i_state & I_FREEING)) {
- if ((inode->i_state & I_DIRTY_PAGES) && wbc->for_kupdate) {
- /*
- * More pages get dirtied by a fast dirtier.
- */
- goto select_queue;
- } else if (inode->i_state & I_DIRTY) {
- /*
- * At least XFS will redirty the inode during the
- * writeback (delalloc) and on io completion (isize).
- */
- redirty_tail(inode);
- } else if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+ if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
/*
* We didn't write back all the pages. nfs_writepages()
* sometimes bales out without doing anything. Redirty
@@ -396,7 +385,6 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
* soon as the queue becomes uncongested.
*/
inode->i_state |= I_DIRTY_PAGES;
-select_queue:
if (wbc->nr_to_write <= 0) {
/*
* slice used up: queue for next turn
@@ -419,6 +407,14 @@ select_queue:
inode->i_state |= I_DIRTY_PAGES;
redirty_tail(inode);
}
+ } else if (inode->i_state & I_DIRTY) {
+ /*
+ * Filesystems can dirty the inode during writeback
+ * operations, such as delayed allocation during
+ * submission or metadata updates after data IO
+ * completion.
+ */
+ redirty_tail(inode);
} else if (atomic_read(&inode->i_count)) {
/*
* The inode is clean, inuse