[PATCH AUTOSEL 4.9 04/23] ceph: return ceph_mdsc_do_request() errors from __get_parent()

[PATCH AUTOSEL 4.9 04/23] ceph: return ceph_mdsc_do_request() errors from __get_parent()

[Sasha Levin]

From: Qiujun Huang <hqjagain@gmail.com>

[ Upstream commit c6d50296032f0b97473eb2e274dc7cc5d0173847 ]

Return the error returned by ceph_mdsc_do_request(). Otherwise,
r_target_inode ends up being NULL this ends up returning ENOENT
regardless of the error.

Signed-off-by: Qiujun Huang <hqjagain@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ceph/export.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index 1780218a48f08..f8e1f31e46439 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -157,6 +157,11 @@ static struct dentry *__get_parent(struct super_block *sb,
 
 	req->r_num_caps = 1;
 	err = ceph_mdsc_do_request(mdsc, NULL, req);
+	if (err) {
+		ceph_mdsc_put_request(req);
+		return ERR_PTR(err);
+	}
+
 	inode = req->r_target_inode;
 	if (inode)
 		ihold(inode);
-- 
2.20.1

[PATCH AUTOSEL 4.9 05/23] ceph: don't skip updating wanted caps when cap is stale

[Sasha Levin]

From: "Yan, Zheng" <zyan@redhat.com>

[ Upstream commit 0aa971b6fd3f92afef6afe24ef78d9bb14471519 ]

1. try_get_cap_refs() fails to get caps and finds that mds_wanted
   does not include what it wants. It returns -ESTALE.
2. ceph_get_caps() calls ceph_renew_caps(). ceph_renew_caps() finds
   that inode has cap, so it calls ceph_check_caps().
3. ceph_check_caps() finds that issued caps (without checking if it's
   stale) already includes caps wanted by open file, so it skips
   updating wanted caps.

Above events can cause an infinite loop inside ceph_get_caps().

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ceph/caps.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index f5d9835264aa1..617e9ae67f506 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -1764,8 +1764,12 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 		}
 
 		/* want more caps from mds? */
-		if (want & ~(cap->mds_wanted | cap->issued))
-			goto ack;
+		if (want & ~cap->mds_wanted) {
+			if (want & ~(cap->mds_wanted | cap->issued))
+				goto ack;
+			if (!__cap_is_valid(cap))
+				goto ack;
+		}
 
 		/* things we might delay */
 		if ((cap->issued & ~retain) == 0 &&
-- 
2.20.1