From e12937279c8b07798651de7f5c8c52974c699931 Mon Sep 17 00:00:00 2001 From: Benjamin Coddington Date: Tue, 11 Apr 2017 12:50:08 -0400 Subject: 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 Reviewed-by: Christoph Hellwig Reviewed-by: Jeff Layton Signed-off-by: Trond Myklebust --- fs/nfs/file.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'fs/nfs/file.c') 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); -- cgit v1.2.3