ceph: drop unconnected inodes

Positve dentry and corresponding inode are always accompanied in MDS reply.
So no need to keep inode in the cache after dropping all its aliases.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>

3 files changed, 12 insertions, 0 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 278fd2891288..d37b2dc01d3f 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -436,6 +436,16 @@ void ceph_destroy_inode(struct inode *inode)
         call_rcu(&inode->i_rcu, ceph_i_callback);
 }
 
+int ceph_drop_inode(struct inode *inode)
+{
+        /*
+         * Positve dentry and corresponding inode are always accompanied
+         * in MDS reply. So no need to keep inode in the cache after
+         * dropping all its aliases.
+         */
+        return 1;
+}
+
 /*
  * Helpers to fill in size, ctime, mtime, and atime.  We have to be
  * careful because either the client or MDS may have more up to date
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 6a0951e43044..e58bd4a23bfb 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -686,6 +686,7 @@ static const struct super_operations ceph_super_ops = {
         .alloc_inode    = ceph_alloc_inode,
         .destroy_inode  = ceph_destroy_inode,
         .write_inode    = ceph_write_inode,
+        .drop_inode     = ceph_drop_inode,
         .sync_fs        = ceph_sync_fs,
         .put_super      = ceph_put_super,
         .show_options   = ceph_show_options,
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index ef4ac38bb614..8de94b564d67 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -691,6 +691,7 @@ extern const struct inode_operations ceph_file_iops;
 
 extern struct inode *ceph_alloc_inode(struct super_block *sb);
 extern void ceph_destroy_inode(struct inode *inode);
+extern int ceph_drop_inode(struct inode *inode);
 
 extern struct inode *ceph_get_inode(struct super_block *sb,
                                     struct ceph_vino vino);