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From: Jeff Layton <jlayton@kernel.org>
To: ceph-devel@vger.kernel.org
Cc: idryomov@gmail.com, pdonnell@redhat.com
Subject: [PATCH 4/6] ceph: fix auth cap handling logic in remove_session_caps_cb
Date: Wed,  8 Sep 2021 09:03:34 -0400	[thread overview]
Message-ID: <20210908130336.56668-5-jlayton@kernel.org> (raw)
In-Reply-To: <20210908130336.56668-1-jlayton@kernel.org>

The existing logic relies on ci->i_auth_cap being NULL, but if we end up
removing the auth cap early, then we'll do a lot of useless work and
lock-taking on the remaining caps. Ensure that we only do the auth cap
removal when we're _actually_ removing the auth cap.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
 fs/ceph/mds_client.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 2ff4e6481d09..4b3ef0412539 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1626,6 +1626,7 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 	struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
 	struct ceph_mds_client *mdsc = fsc->mdsc;
 	struct ceph_inode_info *ci = ceph_inode(inode);
+	bool is_auth;
 	bool dirty_dropped = false;
 	bool invalidate = false;
 	int capsnap_release = 0;
@@ -1633,8 +1634,9 @@ static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
 	dout("removing cap %p, ci is %p, inode is %p\n",
 	     cap, ci, &ci->vfs_inode);
 	spin_lock(&ci->i_ceph_lock);
+	is_auth = (cap == ci->i_auth_cap);
 	__ceph_remove_cap(cap, false);
-	if (!ci->i_auth_cap) {
+	if (is_auth) {
 		struct ceph_cap_flush *cf;
 
 		if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
-- 
2.31.1


  parent reply	other threads:[~2021-09-08 13:04 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08 13:03 [PATCH 0/6] ceph: better error handling for failed async creates Jeff Layton
2021-09-08 13:03 ` [PATCH 1/6] ceph: print inode numbers instead of pointer values Jeff Layton
2021-09-08 13:03 ` [PATCH 2/6] ceph: don't use -ESTALE as special return code in try_get_cap_refs Jeff Layton
2021-09-08 13:03 ` [PATCH 3/6] ceph: drop private list from remove_session_caps_cb Jeff Layton
2021-09-08 13:03 ` Jeff Layton [this message]
2021-09-08 13:03 ` [PATCH 5/6] ceph: refactor remove_session_caps_cb Jeff Layton
2021-09-08 13:03 ` [PATCH 6/6] ceph: shut down access to inode when async create fails Jeff Layton

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