Re: [PATCH] update ctime and mtime for mmaped write

From: Miklos Szeredi
Date: Thu Feb 22 2007 - 15:49:21 EST

> > __fput() will be called when there are no more references to 'file',
> > then it will update the time if the flag is set. This applies to
> > regular files as well as devices.
> >
> >
> I suspect that you will find that, for a block device, the wrong inode
> gets updated. That's where the bd_inode_update_time() portion of my
> proposed patch came from.

How horrible :( I haven't noticed that part of the patch. But I don't
think that's needed. Updating the times through the file pointer
should be OK. You have this problem because you use the inode which
comes from the blockdev pseudo-filesystem.

> > But I've moved the check from __fput to remove_vma() in the next
> > revision of the patch, which would give slightly nicer semantics, and
> > be equally conforming.
> This still does not address the situation where a file is 'permanently'
> mmap'd, does it?

So? If application doesn't do msync, then the file times won't be
updated. That's allowed by the standard, and so portable applications
will have to call msync.

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