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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>
zero-colors
Benjamin Coddington 2017-04-11 12:50:08 -04:00 committed by Trond Myklebust
parent 12a16d15b6
commit e12937279c
2 changed files with 16 additions and 16 deletions
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18
fs/nfs/file.c
View File

@ -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);

14
fs/nfs/nfs4proc.c
View File

@ -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;