ceph: check inode caps in ceph_d_revalidate

Some inodes in readdir reply may have no caps. Getattr mds request
for these inodes can return -ESTALE. The fix is consider dentry that
links to inode with no caps as invalid. Invalid dentry causes a
lookup request to send to the mds, the MDS will send caps back.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

3 files changed, 21 insertions, 3 deletions

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index d2154d63f671..d65ff334901c 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -891,6 +891,18 @@ static int __ceph_is_any_caps(struct ceph_inode_info *ci)
         return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0;
 }
 
+int ceph_is_any_caps(struct inode *inode)
+{
+        struct ceph_inode_info *ci = ceph_inode(inode);
+        int ret;
+
+        spin_lock(&ci->i_ceph_lock);
+        ret = __ceph_is_any_caps(ci);
+        spin_unlock(&ci->i_ceph_lock);
+
+        return ret;
+}
+
 /*
  * Remove a cap.  Take steps to deal with a racing iterate_session_caps.
  *
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index b629e9d59a35..619616d585b0 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1041,14 +1041,19 @@ static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags)
                 valid = 1;
         } else if (dentry_lease_is_valid(dentry) ||
                    dir_lease_is_valid(dir, dentry)) {
-                valid = 1;
+                if (dentry->d_inode)
+                        valid = ceph_is_any_caps(dentry->d_inode);
+                else
+                        valid = 1;
         }
 
         dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid");
-        if (valid)
+        if (valid) {
                 ceph_dentry_lru_touch(dentry);
-        else
+        } else {
+                ceph_dir_clear_complete(dir);
                 d_drop(dentry);
+        }
         iput(dir);
         return valid;
 }
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 891cda8c72aa..a6ba32fb0d49 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -782,6 +782,7 @@ extern int ceph_add_cap(struct inode *inode,
 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release);
 extern void ceph_put_cap(struct ceph_mds_client *mdsc,
                          struct ceph_cap *cap);
+extern int ceph_is_any_caps(struct inode *inode);
 
 extern void __queue_cap_release(struct ceph_mds_session *session, u64 ino,
                                 u64 cap_id, u32 migrate_seq, u32 issue_seq);