linux-kernel - [PATCH 5.16 034/200] ceph: set pool_ns in new inode layout for async creates

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Date:   Mon, 31 Jan 2022 11:54:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan van der Ster <dan@...derster.com>,
        Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>
Subject: [PATCH 5.16 034/200] ceph: set pool_ns in new inode layout for async creates

From: Jeff Layton <jlayton@...nel.org>

commit 4584a768f22b7669cdebabc911543621ac661341 upstream.

Dan reported that he was unable to write to files that had been
asynchronously created when the client's OSD caps are restricted to a
particular namespace.

The issue is that the layout for the new inode is only partially being
filled. Ensure that we populate the pool_ns_data and pool_ns_len in the
iinfo before calling ceph_fill_inode.

Cc: stable@...r.kernel.org
URL: https://tracker.ceph.com/issues/54013
Fixes: 9a8d03ca2e2c ("ceph: attempt to do async create when possible")
Reported-by: Dan van der Ster <dan@...derster.com>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Reviewed-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ceph/file.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -579,6 +579,7 @@ static int ceph_finish_async_create(stru
 	struct ceph_inode_info *ci = ceph_inode(dir);
 	struct inode *inode;
 	struct timespec64 now;
+	struct ceph_string *pool_ns;
 	struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb);
 	struct ceph_vino vino = { .ino = req->r_deleg_ino,
 				  .snap = CEPH_NOSNAP };
@@ -628,6 +629,12 @@ static int ceph_finish_async_create(stru
 	in.max_size = cpu_to_le64(lo->stripe_unit);
 
 	ceph_file_layout_to_legacy(lo, &in.layout);
+	/* lo is private, so pool_ns can't change */
+	pool_ns = rcu_dereference_raw(lo->pool_ns);
+	if (pool_ns) {
+		iinfo.pool_ns_len = pool_ns->len;
+		iinfo.pool_ns_data = pool_ns->str;
+	}
 
 	down_read(&mdsc->snap_rwsem);
 	ret = ceph_fill_inode(inode, NULL, &iinfo, NULL, req->r_session,