NFS: Ensure that we always drop inodes that have been marked as stale

There is no need to cache stale inodes.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 9 insertions, 0 deletions

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 117183b1ee09..2faae14d89f4 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -107,6 +107,12 @@ u64 nfs_compat_user_ino64(u64 fileid)
         return ino;
 }
 
+int nfs_drop_inode(struct inode *inode)
+{
+        return NFS_STALE(inode) || generic_drop_inode(inode);
+}
+EXPORT_SYMBOL_GPL(nfs_drop_inode);
+
 void nfs_clear_inode(struct inode *inode)
 {
         /*
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 89c1ee4a432c..f0e6c7df1a07 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -296,6 +296,7 @@ extern struct workqueue_struct *nfsiod_workqueue;
 extern struct inode *nfs_alloc_inode(struct super_block *sb);
 extern void nfs_destroy_inode(struct inode *);
 extern int nfs_write_inode(struct inode *, struct writeback_control *);
+extern int nfs_drop_inode(struct inode *);
 extern void nfs_clear_inode(struct inode *);
 extern void nfs_evict_inode(struct inode *);
 void nfs_zap_acl_cache(struct inode *inode);
diff --git a/fs/nfs/nfs4super.c b/fs/nfs/nfs4super.c
index bd61221ad2c5..84d2e9e2f313 100644
--- a/fs/nfs/nfs4super.c
+++ b/fs/nfs/nfs4super.c
@@ -51,6 +51,7 @@ static const struct super_operations nfs4_sops = {
         .alloc_inode    = nfs_alloc_inode,
         .destroy_inode  = nfs_destroy_inode,
         .write_inode    = nfs4_write_inode,
+        .drop_inode     = nfs_drop_inode,
         .put_super      = nfs_put_super,
         .statfs         = nfs_statfs,
         .evict_inode    = nfs4_evict_inode,
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index e12cea4b36a5..aa5315bb3666 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -308,6 +308,7 @@ const struct super_operations nfs_sops = {
         .alloc_inode    = nfs_alloc_inode,
         .destroy_inode  = nfs_destroy_inode,
         .write_inode    = nfs_write_inode,
+        .drop_inode     = nfs_drop_inode,
         .put_super      = nfs_put_super,
         .statfs         = nfs_statfs,
         .evict_inode    = nfs_evict_inode,