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From: Christian Brauner <brauner@kernel.org>
To: Jeff Layton <jlayton@kernel.org>, ceph-devel@vger.kernel.org
Cc: Ilya Dryomov <idryomov@gmail.com>, Christoph Hellwig <hch@lst.de>,
	Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH 01/12] ceph: stash idmapping in mdsc request
Date: Tue,  4 Jan 2022 15:04:03 +0100	[thread overview]
Message-ID: <20220104140414.155198-2-brauner@kernel.org> (raw)
In-Reply-To: <20220104140414.155198-1-brauner@kernel.org>

From: Christian Brauner <christian.brauner@ubuntu.com>

When sending a mds request cephfs will send relevant data for the
requested operation. For creation requests the caller's fs{g,u}id is
used to set the ownership of the newly created filesystem object. For
setattr requests the caller can pass in arbitrary {g,u}id values to
which the relevant filesystem object is supposed to be changed.

If the caller is performing the relevant operation via an idmapped mount
cephfs simply needs to take the idmapping into account when it sends the
relevant mds request.

In order to support idmapped mounts for cephfs we stash the idmapping
whenever they are relevant for the operation for the duration of the
request. Since mds requests can be queued and performed asynchronously
we make sure to keep the idmapping around and release it once the
request has finished.

In follow-up patches we will use this to send correct ownership
information over the wire. This patch just adds the basic infrastructure
to keep the idmapping around. The actual conversion patches are all
fairly minimal.

Cc: Jeff Layton <jlayton@kernel.org>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: ceph-devel@vger.kernel.org
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
 fs/ceph/mds_client.c | 7 +++++++
 fs/ceph/mds_client.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index c30eefc0ac19..ae2cc4ce1d48 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -12,6 +12,7 @@
 #include <linux/bits.h>
 #include <linux/ktime.h>
 #include <linux/bitmap.h>
+#include <linux/mnt_idmapping.h>
 
 #include "super.h"
 #include "mds_client.h"
@@ -862,6 +863,8 @@ void ceph_mdsc_release_request(struct kref *kref)
 	kfree(req->r_path1);
 	kfree(req->r_path2);
 	put_cred(req->r_cred);
+	if (!initial_idmapping(req->mnt_userns))
+		put_user_ns(req->mnt_userns);
 	if (req->r_pagelist)
 		ceph_pagelist_release(req->r_pagelist);
 	put_request_session(req);
@@ -918,6 +921,10 @@ static void __register_request(struct ceph_mds_client *mdsc,
 	insert_request(&mdsc->request_tree, req);
 
 	req->r_cred = get_current_cred();
+	if (!req->mnt_userns)
+		req->mnt_userns = &init_user_ns;
+	else
+		get_user_ns(req->mnt_userns);
 
 	if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
 		mdsc->oldest_tid = req->r_tid;
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 97c7f7bfa55f..1b648645e340 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -275,6 +275,7 @@ struct ceph_mds_request {
 	union ceph_mds_request_args r_args;
 	int r_fmode;        /* file mode, if expecting cap */
 	const struct cred *r_cred;
+	struct user_namespace *mnt_userns;
 	int r_request_release_offset;
 	struct timespec64 r_stamp;
 
-- 
2.32.0


  reply	other threads:[~2022-01-04 14:04 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-04 14:04 [PATCH 00/12] ceph: support idmapped mounts Christian Brauner
2022-01-04 14:04 ` Christian Brauner [this message]
2022-01-04 17:22   ` [PATCH 01/12] ceph: stash idmapping in mdsc request Jeff Layton
2022-01-04 14:04 ` [PATCH 02/12] ceph: handle idmapped mounts in create_request_message() Christian Brauner
2022-01-04 17:40   ` Jeff Layton
2022-01-04 19:33     ` Gregory Farnum
2022-01-05 14:11       ` Christian Brauner
2022-01-05 14:10     ` Christian Brauner
2022-01-05 15:03       ` Jeff Layton
2022-01-05 15:35         ` Christian Brauner
2022-01-04 14:04 ` [PATCH 03/12] ceph: allow idmapped mknod inode op Christian Brauner
2022-01-04 14:04 ` [PATCH 04/12] ceph: allow idmapped symlink " Christian Brauner
2022-01-04 14:04 ` [PATCH 05/12] ceph: allow idmapped mkdir " Christian Brauner
2022-01-04 14:04 ` [PATCH 06/12] ceph: allow idmapped rename " Christian Brauner
2022-01-04 14:04 ` [PATCH 07/12] ceph: allow idmapped getattr " Christian Brauner
2022-01-04 14:04 ` [PATCH 08/12] ceph: allow idmapped permission " Christian Brauner
2022-01-04 14:04 ` [PATCH 09/12] ceph: allow idmapped setattr " Christian Brauner
2022-01-04 14:04 ` [PATCH 10/12] ceph/acl: allow idmapped set_acl " Christian Brauner
2022-01-04 14:04 ` [PATCH 11/12] ceph/file: allow idmapped atomic_open " Christian Brauner
2022-01-04 14:04 ` [PATCH 12/12] ceph: allow idmapped mounts Christian Brauner

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