4.19-stable review patch. If anyone has any objections, please let me know.
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From: Xiubo Li xiubli@redhat.com
[ Upstream commit b493ad718b1f0357394d2cdecbf00a44a36fa085 ]
The lock order is incorrect between denty and its parent, we should always make sure that the parent get the lock first.
But since this deadcode is never used and the parent dir will always be set from the callers, let's just remove it.
Link: https://lore.kernel.org/r/20231116081919.GZ1957730@ZenIV Reported-by: Al Viro viro@zeniv.linux.org.uk Signed-off-by: Xiubo Li xiubli@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 | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index fcfba2af5f98..729a67700a4f 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -4216,12 +4216,14 @@ int ceph_encode_dentry_release(void **p, struct dentry *dentry, struct inode *dir, int mds, int drop, int unless) { - struct dentry *parent = NULL; struct ceph_mds_request_release *rel = *p; struct ceph_dentry_info *di = ceph_dentry(dentry); int force = 0; int ret;
+ /* This shouldn't happen */ + BUG_ON(!dir); + /* * force an record for the directory caps if we have a dentry lease. * this is racy (can't take i_ceph_lock and d_lock together), but it @@ -4231,14 +4233,9 @@ int ceph_encode_dentry_release(void **p, struct dentry *dentry, spin_lock(&dentry->d_lock); if (di->lease_session && di->lease_session->s_mds == mds) force = 1; - if (!dir) { - parent = dget(dentry->d_parent); - dir = d_inode(parent); - } spin_unlock(&dentry->d_lock);
ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force); - dput(parent);
spin_lock(&dentry->d_lock); if (ret && di->lease_session && di->lease_session->s_mds == mds) {