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cifs: Fix cifs_write_back_from_locked_folio() 

cifs_write_back_from_locked_folio() should return the number of bytes read,
but returns the result of ->async_writev(), which will be 0 on success.  As
it happens, this doesn't prevent cifs_writepages_region() from working as
it will then examine and ignore the pages that are no longer dirty rather
than just skipping over them.

Fixes: d08089f649 ("cifs: Change the I/O paths to use an iterator rather than a page list")
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Tom Talpey <tom@talpey.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
David Howells 2023-02-27 13:04:53 +00:00 committed by Steve French
parent 410612b072
commit 0268792f77
1 changed files with 1 additions and 0 deletions
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fs/cifs/file.c
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@ -2845,6 +2845,7 @@ err_xid:
free_xid(xid);
if (rc == 0) {
wbc->nr_to_write = count;
rc = len;
} else if (is_retryable_error(rc)) {
cifs_pages_write_redirty(inode, start, len);
} else {