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writeback: kupdate writeback shall not stop when more io is possible

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Fix the kupdate case, which disregards wbc.more_io and stop writeback
prematurely even when there are more inodes to be synced.

wbc.more_io should always be respected.

Also remove the pages_skipped check. It will set when some page(s) of some
inode(s) cannot be written for now. Such inodes will be delayed for a while.
This variable has nothing to do with whether there are other writeable inodes.

CC: Jan Kara <[email protected]>
CC: Dave Chinner <[email protected]>
CC: Peter Zijlstra <[email protected]>
Signed-off-by: Wu Fengguang <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Wu Fengguang 2009-09-23 20:33:41 +08:00 • committed by Jens Axboe
commit 7fbdea3232
1 changed files with 2 additions and 2 deletions
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4
fs/fs-writeback.c
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@ -753,8 +753,8 @@ static long wb_writeback(struct bdi_writeback *wb,
/*
* If we ran out of stuff to write, bail unless more_io got set
*/
if (wbc.nr_to_write > 0 || wbc.pages_skipped > 0) {
if (wbc.more_io && !wbc.for_kupdate) {
if (wbc.nr_to_write > 0) {
if (wbc.more_io) {
if (wbc.nr_to_write < MAX_WRITEBACK_PAGES)
continue;
/*