nfsd4: fix openmode checking on IO using lock stateid

It is legal to perform a write using the lock stateid that was
originally associated with a read lock, or with a file that was
originally opened for read, but has since been upgraded.

So, when checking the openmode, check the mode associated with the
open stateid from which the lock was derived.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index d9c8232fc62f..b996a4badeb8 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2779,6 +2779,9 @@ __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
 {
         __be32 status = nfserr_openmode;
 
+        /* For lock stateid's, we test the parent open, not the lock: */
+        if (stp->st_openstp)
+                stp = stp->st_openstp;
         if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
                 goto out;
         if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
@@ -3466,7 +3469,6 @@ alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struc
         stp->st_stateid.si_fileid = fp->fi_id;
         stp->st_stateid.si_generation = 0;
         stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
-        stp->st_access_bmap = open_stp->st_access_bmap;
         stp->st_deny_bmap = open_stp->st_deny_bmap;
         stp->st_openstp = open_stp;