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afs: Don't wait for page writeback with the page lock held 

Drop the page lock before waiting for page writeback.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2017-03-16 16:27:49 +00:00
parent 65a151094e
commit c5051c7bc7
1 changed files with 4 additions and 5 deletions
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9
fs/afs/write.c
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@ -518,17 +518,16 @@ static int afs_writepages_region(struct address_space *mapping,
*/
lock_page(page);
if (page->mapping != mapping) {
if (page->mapping != mapping || !PageDirty(page)) {
unlock_page(page);
put_page(page);
continue;
}
if (wbc->sync_mode != WB_SYNC_NONE)
wait_on_page_writeback(page);
if (PageWriteback(page) || !PageDirty(page)) {
if (PageWriteback(page)) {
unlock_page(page);
if (wbc->sync_mode != WB_SYNC_NONE)
wait_on_page_writeback(page);
put_page(page);
continue;
}