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ceph: fix auth cap handling logic in remove_session_caps_cb

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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>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2021-09-02 12:47:01 -04:00 committed by Ilya Dryomov
parent c35cac610a
commit 3c3050267e
1 changed files with 3 additions and 1 deletions
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4
fs/ceph/mds_client.c
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@ -1619,6 +1619,7 @@ 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;
@ -1626,8 +1627,9 @@ 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) {