tree 0721b1775b9a99ed5481e8a47383f6f49b50f64a
parent a96e5b90804be8b540d30f4a1453fc87f95b3149
author Sachin Prabhu <sprabhu@redhat.com> 1303301375 +0100
committer J. Bruce Fields <bfields@redhat.com> 1303311781 -0400

Open with O_CREAT flag set fails to open existing files on non writable directories

An open on a NFS4 share using the O_CREAT flag on an existing file for
which we have permissions to open but contained in a directory with no
write permissions will fail with EACCES.

A tcpdump shows that the client had set the open mode to UNCHECKED which
indicates that the file should be created if it doesn't exist and
encountering an existing flag is not an error. Since in this case the
file exists and can be opened by the user, the NFS server is wrong in
attempting to check create permissions on the parent directory.

The patch adds a conditional statement to check for create permissions
only if the file doesn't exist.

Signed-off-by: Sachin S. Prabhu <sprabhu@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>