NFS: Sync the correct byte range during synchronous writes

commit e973b1a5999e57da677ab50da5f5479fdc0f0c31 upstream.

Since commit 18290650b1c8 ("NFS: Move buffered I/O locking into
nfs_file_write()") nfs_file_write() has not flushed the correct byte
range during synchronous writes.  generic_write_sync() expects that
iocb->ki_pos points to the right edge of the range rather than the
left edge.

To replicate the problem, open a file with O_DSYNC, have the client
write at increasing offsets, and then print the successful offsets.
Block port 2049 partway through that sequence, and observe that the
client application indicates successful writes in advance of what the
server received.

Fixes: 18290650b1c8 ("NFS: Move buffered I/O locking into nfs_file_write()")
Signed-off-by: Jacob Strauss <jsstraus@amazon.com>
Signed-off-by: Tarang Gupta <tarangg@amazon.com>
Tested-by: Tarang Gupta <tarangg@amazon.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index d264363559db6e7fafd789e26e372ee5766ac05e..426e4e06b33324da7db6cb1f6f65413b103004b5 100644 (file)
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -629,11 +629,11 @@ ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
        if (result <= 0)
                goto out;
 
-       result = generic_write_sync(iocb, result);
-       if (result < 0)
-               goto out;
        written = result;
        iocb->ki_pos += written;
+       result = generic_write_sync(iocb, written);
+       if (result < 0)
+               goto out;
 
        /* Return error values */
        if (nfs_need_check_write(file, inode)) {