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netfs: Fix writethrough-mode error handling

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Fix the error return in netfs_perform_write() acting in writethrough-mode
to return any cached error in the case that netfs_end_writethrough()
returns 0.

This can affect the use of O_SYNC/O_DSYNC/RWF_SYNC/RWF_DSYNC in 9p and afs.

Fixes: 41d8e7673a ("netfs: Implement a write-through caching option")
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/6736.1713343639@warthog.procyon.org.uk
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: Eric Van Hensbergen <ericvh@kernel.org>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: Christian Schoenebeck <linux_oss@crudebyte.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
cc: v9fs@lists.linux.dev
cc: linux-afs@lists.infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells 2024-04-17 09:47:19 +01:00 committed by Christian Brauner
parent 9b872cc50d
commit 619606a7b8
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 6 additions and 4 deletions
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10
fs/netfs/buffered_write.c
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@ -164,7 +164,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
enum netfs_how_to_modify howto;
enum netfs_folio_trace trace;
unsigned int bdp_flags = (iocb->ki_flags & IOCB_SYNC) ? 0: BDP_ASYNC;
ssize_t written = 0, ret;
ssize_t written = 0, ret, ret2;
loff_t i_size, pos = iocb->ki_pos, from, to;
size_t max_chunk = PAGE_SIZE << MAX_PAGECACHE_ORDER;
bool maybe_trouble = false;
@ -395,10 +395,12 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
out:
if (unlikely(wreq)) {
ret = netfs_end_writethrough(wreq, iocb);
ret2 = netfs_end_writethrough(wreq, iocb);
wbc_detach_inode(&wbc);
if (ret == -EIOCBQUEUED)
return ret;
if (ret2 == -EIOCBQUEUED)
return ret2;
if (ret == 0)
ret = ret2;
}
iocb->ki_pos += written;