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Re: [PATCH 7/9] vfs: protect remounting superblock read-only

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From: Al Viro
Subject: Re: [PATCH 7/9] vfs: protect remounting superblock read-only
Date: Thursday, October 21, 2010 - 11:46 pm

On Tue, Oct 05, 2010 at 12:31:15PM +0200, Miklos Szeredi wrote:

Umm...  What'll happen if your remount will say mnt_want_write() on
e.g. internal vfsmount over that sb?  Or, more subtle, tries to
update atime on some opened struct file on that sb.
--
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Messages in current thread:
[PATCH 0/9] read-only remount fixes, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 1/9] vfs: fix infinite loop caused by clone_mnt race, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 2/9] vfs: ignore error on forced remount, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 3/9] vfs: fix per mount read-write, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 4/9] vfs: add sb_force_remount_readonly() helper, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 5/9] vfs: allow mnt_want_write() to sleep, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 6/9] vfs: keep list of mounts for each superblock, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 7/9] vfs: protect remounting superblock read-only, Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 8/9] vfs: fs_may_remount_ro: turn unnecessary check ..., Miklos Szeredi, (Tue Oct 5, 3:31 am)
[PATCH 9/9] vfs: mark mounts read-only on forced remount, Miklos Szeredi, (Tue Oct 5, 3:31 am)
Re: [PATCH 1/9] vfs: fix infinite loop caused by clone_mnt ..., Miklos Szeredi, (Tue Oct 5, 3:49 am)
Re: [PATCH 7/9] vfs: protect remounting superblock read-only, Al Viro, (Thu Oct 21, 11:46 pm)
Re: [PATCH 7/9] vfs: protect remounting superblock read-only, Miklos Szeredi, (Fri Oct 22, 5:25 am)
[PATCH 7/9 updated] vfs: protect remounting superblock rea ..., Miklos Szeredi, (Fri Oct 22, 9:14 am)
Re: [PATCH 7/9 updated] vfs: protect remounting superblock ..., Al Viro, (Sat Oct 23, 9:19 am)
Re: [PATCH 7/9 updated] vfs: protect remounting superblock ..., Al Viro, (Sat Oct 23, 2:42 pm)
Re: [PATCH 7/9 updated] vfs: protect remounting superblock ..., Miklos Szeredi, (Mon Oct 25, 5:36 am)