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nfs: verify open flags before allowing an atomic open

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Currently, you can open a NFSv4 file with O_APPEND|O_DIRECT, but cannot
fcntl(F_SETFL,...) with those flags. This flag combination is explicitly
forbidden on NFSv3 opens, and it seems like it should also be on NFSv4.

Reported-by: Chao Ye <cye@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Jeff Layton 2013-08-02 11:39:32 -04:00 • committed by Trond Myklebust
parent 55b592933b
commit 9597c13b2f
1 changed files with 4 additions and 0 deletions
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4
fs/nfs/dir.c
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@ -1413,6 +1413,10 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n", dfprintk(VFS, "NFS: atomic_open(%s/%ld), %s\n",
dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); dir->i_sb->s_id, dir->i_ino, dentry->d_name.name);
err = nfs_check_flags(open_flags);
if (err)
return err;
/* NFS only supports OPEN on regular files */ /* NFS only supports OPEN on regular files */
if ((open_flags & O_DIRECTORY)) { if ((open_flags & O_DIRECTORY)) {
if (!d_unhashed(dentry)) { if (!d_unhashed(dentry)) {