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authorBenjamin Coddington <bcodding@redhat.com>2017-04-11 12:50:08 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2017-04-21 10:45:00 -0400
commite12937279c8b07798651de7f5c8c52974c699931 (patch)
treefe115eac669f575bfdf74c66b9abe6787ad92ea8 /fs
parent12a16d15b67c66fc0a8274d094a270e4fbaed3eb (diff)
downloadlinux-e12937279c8b07798651de7f5c8c52974c699931.tar.bz2
NFS: Move the flock open mode check into nfs_flock()
We only need to check lock exclusive/shared types against open mode when flock() is used on NFS, so move it into the flock-specific path instead of checking it for all locks. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/file.c18
-rw-r--r--fs/nfs/nfs4proc.c14
2 files changed, 16 insertions, 16 deletions
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 668213984d68..b7f4af3483b6 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -820,9 +820,23 @@ int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
is_local = 1;
- /* We're simulating flock() locks using posix locks on the server */
- if (fl->fl_type == F_UNLCK)
+ /*
+ * VFS doesn't require the open mode to match a flock() lock's type.
+ * NFS, however, may simulate flock() locking with posix locking which
+ * requires the open mode to match the lock type.
+ */
+ switch (fl->fl_type) {
+ case F_UNLCK:
return do_unlk(filp, cmd, fl, is_local);
+ case F_RDLCK:
+ if (!(filp->f_mode & FMODE_READ))
+ return -EBADF;
+ break;
+ case F_WRLCK:
+ if (!(filp->f_mode & FMODE_WRITE))
+ return -EBADF;
+ }
+
return do_setlk(filp, cmd, fl, is_local);
}
EXPORT_SYMBOL_GPL(nfs_flock);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index d682ef3b2da2..c52f72c86940 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -6469,20 +6469,6 @@ nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
!test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
return -ENOLCK;
- /*
- * Don't rely on the VFS having checked the file open mode,
- * since it won't do this for flock() locks.
- */
- switch (request->fl_type) {
- case F_RDLCK:
- if (!(filp->f_mode & FMODE_READ))
- return -EBADF;
- break;
- case F_WRLCK:
- if (!(filp->f_mode & FMODE_WRITE))
- return -EBADF;
- }
-
status = nfs4_set_lock_state(state, request);
if (status != 0)
return status;