From 81a6cf2d30eac5d790f53cdff110892f7b18c7fe Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Fri, 14 May 2010 09:35:38 -0700
Subject: [PATCH] ceph: invalidate affected dentry leases on aborted requests

If we abort a request, we return to caller, but the request may still
complete.  And if we hold the dir FILE_EXCL bit, we may not release a
lease when sending a request.  A simple un-tar, control-c, un-tar again
will reproduce the bug (manifested as a 'Cannot open: File exists').

Ensure we invalidate affected dentry leases (as well dir I_COMPLETE) so
we don't have valid (but incorrect) leases.  Do the same, consistently, at
other sites where I_COMPLETE is similarly cleared.

Signed-off-by: Sage Weil <sage@newdream.net>
---
 fs/ceph/dir.c        | 13 +++++++++++--
 fs/ceph/inode.c      | 13 +++++++++++--
 fs/ceph/mds_client.c |  7 ++++++-
 fs/ceph/super.h      |  1 +
 4 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 650d2db5ed26..4b1a7a4bae0b 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -888,13 +888,22 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
 
 		/* ensure target dentry is invalidated, despite
 		   rehashing bug in vfs_rename_dir */
-		new_dentry->d_time = jiffies;
-		ceph_dentry(new_dentry)->lease_shared_gen = 0;
+		ceph_invalidate_dentry_lease(new_dentry);
 	}
 	ceph_mdsc_put_request(req);
 	return err;
 }
 
+/*
+ * Ensure a dentry lease will no longer revalidate.
+ */
+void ceph_invalidate_dentry_lease(struct dentry *dentry)
+{
+	spin_lock(&dentry->d_lock);
+	dentry->d_time = jiffies;
+	ceph_dentry(dentry)->lease_shared_gen = 0;
+	spin_unlock(&dentry->d_lock);
+}
 
 /*
  * Check if dentry lease is valid.  If not, delete the lease.  Try to
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 85b4d2ffdeba..220a2aec0545 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -938,8 +938,15 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 				ceph_inode(req->r_locked_dir);
 			dout(" clearing %p complete (empty trace)\n",
 			     req->r_locked_dir);
+			spin_lock(&req->r_locked_dir->i_lock);
 			ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
 			ci->i_release_count++;
+			spin_unlock(&req->r_locked_dir->i_lock);
+
+			if (req->r_dentry)
+				ceph_invalidate_dentry_lease(req->r_dentry);
+			if (req->r_old_dentry)
+				ceph_invalidate_dentry_lease(req->r_old_dentry);
 		}
 		return 0;
 	}
@@ -1011,13 +1018,15 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
 			     req->r_old_dentry->d_name.len,
 			     req->r_old_dentry->d_name.name,
 			     dn, dn->d_name.len, dn->d_name.name);
+
 			/* ensure target dentry is invalidated, despite
 			   rehashing bug in vfs_rename_dir */
-			dn->d_time = jiffies;
-			ceph_dentry(dn)->lease_shared_gen = 0;
+			ceph_invalidate_dentry_lease(dn);
+
 			/* take overwritten dentry's readdir offset */
 			ceph_dentry(req->r_old_dentry)->offset =
 				ceph_dentry(dn)->offset;
+
 			dn = req->r_old_dentry;  /* use old_dentry */
 			in = dn->d_inode;
 		}
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index c0568fe3c0ba..76995a960432 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1732,12 +1732,17 @@ int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
 			struct ceph_inode_info *ci =
 				ceph_inode(req->r_locked_dir);
 
-			dout("aborted, clearing I_COMPLETE on %p\n",
+			dout("aborted, clearing I_COMPLETE on %p, leases\n",
 			     req->r_locked_dir);
 			spin_lock(&req->r_locked_dir->i_lock);
 			ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
 			ci->i_release_count++;
 			spin_unlock(&req->r_locked_dir->i_lock);
+
+			if (req->r_dentry)
+				ceph_invalidate_dentry_lease(req->r_dentry);
+			if (req->r_old_dentry)
+				ceph_invalidate_dentry_lease(req->r_old_dentry);
 		}
 	} else {
 		err = req->r_err;
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 13513b80d87f..cfe3b0834d54 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -871,6 +871,7 @@ extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req,
 extern void ceph_dentry_lru_add(struct dentry *dn);
 extern void ceph_dentry_lru_touch(struct dentry *dn);
 extern void ceph_dentry_lru_del(struct dentry *dn);
+extern void ceph_invalidate_dentry_lease(struct dentry *dentry);
 
 /*
  * our d_ops vary depending on whether the inode is live,
-- 
2.20.1