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From: Miklos Szeredi <miklos@szeredi.hu>
To: staubach@redhat.com
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [patch 01/22] update ctime and mtime for mmaped write
Date: Wed, 28 Feb 2007 21:58:54 +0100	[thread overview]
Message-ID: <E1HMVt0-0000D2-00@dorka.pomaz.szeredi.hu> (raw)
In-Reply-To: <E1HMVWJ-00009K-00@dorka.pomaz.szeredi.hu> (message from Miklos Szeredi on Wed, 28 Feb 2007 21:35:27 +0100)

> What happens if the application overwrites what it had written some
> time later?  Nothing.  The page is already read-write, the pte dirty,
> so even though the file was clearly modified, there's absolutely no
> way in which this can be used to force an update to the timestamp.

Which, I realize now, actually means, that the patch is wrong.  Msync
will have to write protect the page table entries, so that later
dirtyings may have an effect on the timestamp.

Thanks,
Miklos

  reply	other threads:[~2007-02-28 20:59 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-27 23:14 [patch 00/22] misc VFS/VM patches and fuse writable shared mapping support Miklos Szeredi
2007-02-27 23:14 ` [patch 01/22] update ctime and mtime for mmaped write Miklos Szeredi
2007-02-28 14:16   ` Peter Staubach
2007-02-28 17:06     ` Miklos Szeredi
2007-02-28 17:21       ` Peter Staubach
2007-02-28 17:51         ` Miklos Szeredi
2007-02-28 20:01           ` Peter Staubach
2007-02-28 20:35             ` Miklos Szeredi
2007-02-28 20:58               ` Miklos Szeredi [this message]
2007-02-28 21:09                 ` Peter Staubach
2007-03-01  7:25                   ` Miklos Szeredi
2007-02-27 23:14 ` [patch 02/22] fix quadratic behavior of shrink_dcache_parent() Miklos Szeredi
2007-02-27 23:14 ` [patch 03/22] fix deadlock in balance_dirty_pages Miklos Szeredi
2007-02-27 23:14 ` [patch 04/22] fix deadlock in throttle_vm_writeout Miklos Szeredi
2007-02-27 23:14 ` [patch 05/22] balance dirty pages from loop device Miklos Szeredi
2007-02-27 23:14 ` [patch 06/22] consolidate generic_writepages and mpage_writepages Miklos Szeredi
2007-02-27 23:14 ` [patch 07/22] add filesystem subtype support Miklos Szeredi
2007-02-27 23:14 ` [patch 08/22] fuse: update backing_dev_info congestion state Miklos Szeredi
2007-02-27 23:14 ` [patch 09/22] fuse: fix reserved request wake up Miklos Szeredi
2007-02-27 23:14 ` [patch 10/22] fuse: add reference counting to fuse_file Miklos Szeredi
2007-02-27 23:14 ` [patch 11/22] fuse: add truncation semaphore Miklos Szeredi
2007-02-27 23:14 ` [patch 12/22] fuse: fix page invalidation Miklos Szeredi
2007-02-27 23:14 ` [patch 13/22] fuse: add list of writable files to fuse_inode Miklos Szeredi
2007-02-27 23:14 ` [patch 14/22] fuse: add helper for asynchronous writes Miklos Szeredi
2007-02-27 23:14 ` [patch 15/22] add non-owner variant of down_read_trylock() Miklos Szeredi
2007-02-27 23:14 ` [patch 16/22] fuse: add fuse_writepage() function Miklos Szeredi
2007-02-27 23:14 ` [patch 17/22] fuse: writable shared mmap support Miklos Szeredi
2007-02-27 23:15 ` [patch 18/22] fuse: add fuse_writepages() function Miklos Szeredi
2007-02-27 23:15 ` [patch 19/22] export sync_sb() to modules Miklos Szeredi
2007-02-27 23:15 ` [patch 20/22] fuse: make dirty stats available Miklos Szeredi
2007-02-27 23:15 ` [patch 21/22] fuse: limit dirty pages Miklos Szeredi
2007-02-27 23:15 ` [patch 22/22] fuse: allow big write requests Miklos Szeredi

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