AcoSail/kernel_optimize_test
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fuse: writepage: skip already in flight

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If ->writepage() tries to write back a page whose copy is still in flight,
then just skip by calling redirty_page_for_writepage().

This is OK, since now ->writepage() should never be called for data
integrity sync.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Miklos Szeredi 2013-10-01 16:44:53 +02:00
parent 8b284dc472
commit ff17be0864
1 changed files with 12 additions and 0 deletions
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12
fs/fuse/file.c
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@ -1591,6 +1591,18 @@ static int fuse_writepage(struct page *page, struct writeback_control *wbc)
{
int err;
if (fuse_page_is_writeback(page->mapping->host, page->index)) {
/*
* ->writepages() should be called for sync() and friends. We
* should only get here on direct reclaim and then we are
* allowed to skip a page which is already in flight
*/
WARN_ON(wbc->sync_mode == WB_SYNC_ALL);
redirty_page_for_writepage(wbc, page);
return 0;
}
err = fuse_writepage_locked(page);
unlock_page(page);