2008-01-15 12:49:52

by Wu Fengguang

[permalink] [raw]
Subject: [PATCH 02/13] writeback: clear PAGECACHE_TAG_DIRTY for truncated page in block_write_full_page()

The `truncated' page in block_write_full_page() may stick for a long time.
E.g. ext2_rmdir() will set i_size to 0, and then the dir inode may hang around
because of being referenced by someone.

So clear PAGECACHE_TAG_DIRTY to prevent pdflush from retrying and iowaiting on
it.

Tested-by: Joerg Platte <[email protected]>
Signed-off-by: Fengguang Wu <[email protected]>
---
fs/buffer.c | 2 ++
1 files changed, 2 insertions(+)

Index: linux/fs/buffer.c
===================================================================
--- linux.orig/fs/buffer.c
+++ linux/fs/buffer.c
@@ -2820,7 +2820,9 @@ int block_write_full_page(struct page *p
* freeable here, so the page does not leak.
*/
do_invalidatepage(page, 0);
+ set_page_writeback(page);
unlock_page(page);
+ end_page_writeback(page);
return 0; /* don't care */
}


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