This avoids delaying writeback for an expired (XFS) inode with lots of
dirty pages, but no active dirtier at the moment.
CC: Dave Chinner <david@xxxxxxxxxxxxx>
CC: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
fs/fs-writeback.c | 20 +++++++-------------
1 file changed, 7 insertions(+), 13 deletions(-)
--- linux.orig/fs/fs-writeback.c 2009-10-06 23:37:57.000000000 +0800
+++ linux/fs/fs-writeback.c 2009-10-06 23:38:28.000000000 +0800
@@ -479,18 +479,7 @@ writeback_single_inode(struct inode *ino
spin_lock(&inode_lock);
inode->i_state &= ~I_SYNC;
if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
- 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
@@ -512,7 +501,6 @@ writeback_single_inode(struct inode *ino
* 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
@@ -535,6 +523,12 @@ select_queue:
inode->i_state |= I_DIRTY_PAGES;
redirty_tail(inode);
}
+ } 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 (atomic_read(&inode->i_count)) {
/*
* The inode is clean, inuse
--
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