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DateFri, 28 Dec 2007 21:41:21 +0800
FromFengguang Wu <>
Subject[PATCH 02/11] writeback: requeue_io_wait() on blocked kupdate
Convert to requeue_io_wait() for case:

kupdate cannot write all pages because of uncontrollable bad conditions.

Cc: Michael Rubin <mrubin@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
---
fs/fs-writeback.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- linux-2.6.24-rc6-mm1.orig/fs/fs-writeback.c
+++ linux-2.6.24-rc6-mm1/fs/fs-writeback.c
@@ -292,11 +292,16 @@ __sync_single_inode(struct inode *inode,
* 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;
- requeue_io(inode);
+ 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
--


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