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netfs: Fix DIO write retry for filesystems without a ->prepare_write()

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Fix netfs_unbuffered_write() so that it doesn't re-issue a write twice when
the filesystem doesn't have a ->prepare_write().  The resetting of the
iterator and the call to netfs_reissue_write() should just be removed as
almost everything it does is done again when the loop it's in goes back to
the top.

It does, however, still need the IN_PROGRESS flag setting, so that (and the
stat inc) are moved out of the if-statement.

Further, the MADE_PROGRESS flags should be cleared and wreq->transferred
should be updated, so fix those too.

Reported-by: syzbot+3c74b1f0c372e98efc32@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=3c74b1f0c372e98efc32
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260625140640.3116900-16-dhowells@redhat.com
cc: Paulo Alcantara <pc@manguebit.org>
cc: hongao <hongao@uniontech.com>
cc: ChenXiaoSong <chenxiaosong@chenxiaosong.com>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
David Howells
2026-06-25 15:06:33 +01:00
committed by Christian Brauner
parent b6a713fd34
commit 64f04f9789
1 changed files with 7 additions and 11 deletions
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18
fs/netfs/direct_write.c
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@@ -166,13 +166,16 @@ static int netfs_unbuffered_write(struct netfs_io_request *wreq)
*/
subreq->error = -EAGAIN;
trace_netfs_sreq(subreq, netfs_sreq_trace_retry);
if (subreq->transferred > 0)
if (subreq->transferred > 0) {
iov_iter_advance(&wreq->buffer.iter, subreq->transferred);
wreq->transferred += subreq->transferred;
}
if (stream->source == NETFS_UPLOAD_TO_SERVER &&
wreq->netfs_ops->retry_request)
wreq->netfs_ops->retry_request(wreq, stream);
__clear_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
__clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
__clear_bit(NETFS_SREQ_BOUNDARY, &subreq->flags);
__clear_bit(NETFS_SREQ_FAILED, &subreq->flags);
@@ -186,17 +189,10 @@ static int netfs_unbuffered_write(struct netfs_io_request *wreq)
netfs_get_subrequest(subreq, netfs_sreq_trace_get_resubmit);
if (stream->prepare_write) {
if (stream->prepare_write)
stream->prepare_write(subreq);
__set_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
netfs_stat(&netfs_n_wh_retry_write_subreq);
} else {
struct iov_iter source;
netfs_reset_iter(subreq);
source = subreq->io_iter;
netfs_reissue_write(stream, subreq, &source);
}
__set_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
netfs_stat(&netfs_n_wh_retry_write_subreq);
}
netfs_unbuffered_write_done(wreq);