nfsd: don't break lease on CLAIM_DELEGATE_CUR

CLAIM_DELEGATE_CUR is used in response to a broken lease; allowing it
to break the lease and return EAGAIN leaves the client unable to make
progress in returning the delegation

nfs4_get_vfs_file() now takes struct nfsd4_open for access to the
claim type, and calls nfsd_open() with NFSD_MAY_NOT_BREAK_LEASE when
claim type is CLAIM_DELEGATE_CUR

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
Cc: stable@kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 12 insertions, 6 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 47da52576e66..3787ec117400 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2585,12 +2585,18 @@ static inline int nfs4_access_to_access(u32 nfs4_access)
         return flags;
 }
 
-static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file
-*fp, struct svc_fh *cur_fh, u32 nfs4_access)
+static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
+                struct svc_fh *cur_fh, struct nfsd4_open *open)
 {
         __be32 status;
-        int oflag = nfs4_access_to_omode(nfs4_access);
-        int access = nfs4_access_to_access(nfs4_access);
+        int oflag = nfs4_access_to_omode(open->op_share_access);
+        int access = nfs4_access_to_access(open->op_share_access);
+
+        /* CLAIM_DELEGATE_CUR is used in response to a broken lease;
+         * allowing it to break the lease and return EAGAIN leaves the
+         * client unable to make progress in returning the delegation */
+        if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
+                access |= NFSD_MAY_NOT_BREAK_LEASE;
 
         if (!fp->fi_fds[oflag]) {
                 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
@@ -2615,7 +2621,7 @@ nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
         if (stp == NULL)
                 return nfserr_resource;
 
-        status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open->op_share_access);
+        status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
         if (status) {
                 kmem_cache_free(stateid_slab, stp);
                 return status;
@@ -2648,7 +2654,7 @@ nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *c
 
         new_access = !test_bit(op_share_access, &stp->st_access_bmap);
         if (new_access) {
-                status = nfs4_get_vfs_file(rqstp, fp, cur_fh, op_share_access);
+                status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
                 if (status)
                         return status;
         }