Re: [PATCH 05/11] fuse: Trust kernel i_mtime only -v2

From: Maxim Patlasov
Date: Mon Jan 20 2014 - 06:33:53 EST

On 01/06/2014 08:22 PM, Miklos Szeredi wrote:
On Thu, Dec 26, 2013 at 07:41:41PM +0400, Maxim Patlasov wrote:
+ if (!err)
+ clear_bit(FUSE_I_MTIME_DIRTY, &fi->state);
Doing the test and the clear separately opens a huge race window when i_mtime
modifications are bound to get lost.
No. Because the whole operation is protected by i_mutex (see
fuse_release_common() doesn't have i_mutex. It's probably safe to acquire it,
but is that really needed?

No, that's not needed, I think. Because by the time of calling fuse_release(), file->f_count is already zero and no userspace activity is possible on the file.

Are you OK about -v3 version of the patch (sent 12/26/2013)?



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