nfsd4: use a single struct file for delegations

When we converted to sharing struct filess between nfs4 opens I went too
far and also used the same mechanism for delegations.  But keeping
a reference to the struct file ensures it will outlast the lease, and
allows us to remove the lease with the same file as we added it.

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

2 files changed, 6 insertions, 5 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 2e44ad2539ab..cbe1b81c147d 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -230,7 +230,8 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_f
         dp->dl_client = clp;
         get_nfs4_file(fp);
         dp->dl_file = fp;
-        nfs4_file_get_access(fp, O_RDONLY);
+        dp->dl_vfs_file = find_readable_file(fp);
+        get_file(dp->dl_vfs_file);
         dp->dl_flock = NULL;
         dp->dl_type = type;
         dp->dl_stateid.si_boot = boot_time;
@@ -252,6 +253,7 @@ nfs4_put_delegation(struct nfs4_delegation *dp)
         if (atomic_dec_and_test(&dp->dl_count)) {
                 dprintk("NFSD: freeing dp %p\n",dp);
                 put_nfs4_file(dp->dl_file);
+                fput(dp->dl_vfs_file);
                 kmem_cache_free(deleg_slab, dp);
                 num_delegations--;
         }
@@ -265,12 +267,10 @@ nfs4_put_delegation(struct nfs4_delegation *dp)
 static void
 nfs4_close_delegation(struct nfs4_delegation *dp)
 {
-        struct file *filp = find_readable_file(dp->dl_file);
-
         dprintk("NFSD: close_delegation dp %p\n",dp);
+        /* XXX: do we even need this check?: */
         if (dp->dl_flock)
-                vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
-        nfs4_file_put_access(dp->dl_file, O_RDONLY);
+                vfs_setlease(dp->dl_vfs_file, F_UNLCK, &dp->dl_flock);
 }
 
 /* Called under the state lock. */
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 39adc27b0685..84b230217b1b 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -81,6 +81,7 @@ struct nfs4_delegation {
         atomic_t                dl_count;       /* ref count */
         struct nfs4_client      *dl_client;
         struct nfs4_file        *dl_file;
+        struct file             *dl_vfs_file;
         struct file_lock        *dl_flock;
         u32                     dl_type;
         time_t                  dl_time;