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From: Cai Xinchen <caixinchen1@huawei.com>
To: Christian Brauner <brauner@kernel.org>
Cc: <mic@digikod.net>, <gnoack@google.com>, <paul@paul-moore.com>,
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Subject: Re: [PATCH v2 -next 01/18] fs: pass struct path to notify_change()
Date: Fri, 23 Oct 2026 14:31:28 +0800	[thread overview]
Message-ID: <a2832263-3e3b-4d05-98bd-dc006d5be689@huawei.com> (raw)
In-Reply-To: <20261021-nanotechnologie-gebadet-gepaukt-52a950759f0a@brauner>

Thanks for the explanation, you are right.  I will restore the idmap as 
a separate argument

On 10/21/2026 6:21 PM, Christian Brauner wrote:
> On Thu, Oct 15, 2026 at 08:54:07PM +0800, Cai Xinchen wrote:
>> notify_change() takes a struct mnt_idmap and a struct dentry even
>> though all of its callers either already hold a struct path (or a
>> struct file) or have to pass &nop_mnt_idmap because no idmapped
>> mount is involved.  Switch the helper and its declaration to take a
>> struct path instead and derive the idmap and dentry from it.
> No, the idmap needs to be passed separately. The whole point is that
> during path lookup mnt->mnt_idmap can change. So mnt->mnt_idmap is taken
> of the mount at the time it was checked and passed down to the
> filesystem so that the VFS and the filesystem are guaranteed to see the
> same idmap.

  reply	other threads:[~2026-10-23  6:31 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-15 12:54 [PATCH v2 -next 00/18] landlock: Add READ_METADATA and WRITE_METADATA access rights Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 01/18] fs: pass struct path to notify_change() Cai Xinchen
2026-10-21 10:21   ` Christian Brauner
2026-10-23  6:31     ` Cai Xinchen [this message]
2026-10-15 12:54 ` [PATCH v2 -next 02/18] LSM: pass struct path to the inode_setsecctx hook Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 03/18] fs: pass struct path to xattr helpers Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 04/18] fs: pass struct path to POSIX ACL helpers Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 05/18] LSM: pass struct path to the inode_setattr hook Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 06/18] LSM: pass struct path to the inode xattr hooks Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 07/18] LSM: pass struct path to the inode posix acl hooks Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 08/18] LSM: pass struct path to the inode fileattr hooks Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 09/18] landlock: Add READ_METADATA and WRITE_METADATA access rights Cai Xinchen
2026-10-16 14:44   ` Justin Suess
2026-10-19 11:43     ` Günther Noack
2026-10-19 13:18       ` Cai Xinchen
2026-10-19 13:16     ` Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 10/18] LSM: rename inode_getattr to path_getattr Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 11/18] LSM: rename inode_setattr to path_setattr Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 12/18] LSM: rename the inode xattr hooks to path_xattr hooks Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 13/18] LSM: rename the inode posix acl hooks to path_*_acl hooks Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 14/18] LSM: rename the inode fileattr hooks to path_file_* hooks Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 15/18] LSM: rename inode_setsecctx to path_setsecctx Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 16/18] selftests/landlock: Add tests for metadata access rights Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 17/18] samples/landlock: Add metadata rights to sandboxer Cai Xinchen
2026-10-15 12:54 ` [PATCH v2 -next 18/18] Documentation: Update landlock doc for metadata rights Cai Xinchen
2026-10-21 10:25 ` [PATCH v2 -next 00/18] landlock: Add READ_METADATA and WRITE_METADATA access rights Christian Brauner

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