> Reminds me, I've got a patch here for addressing that problem with loop mounts:
quoted text
> 
> Writes to loop should update the mtime of the underlying file.
> 
> Signed-off-by: Matt Mackall <mpm@selenic.com>
> 
> Index: l/drivers/block/loop.c
> ===================================================================
> --- l.orig/drivers/block/loop.c	2007-11-05 17:50:07.000000000 -0600
> +++ l/drivers/block/loop.c	2007-11-05 19:03:51.000000000 -0600
> @@ -221,6 +221,7 @@ static int do_lo_send_aops(struct loop_d
>  	offset = pos & ((pgoff_t)PAGE_CACHE_SIZE - 1);
>  	bv_offs = bvec->bv_offset;
>  	len = bvec->bv_len;
> +	file_update_time(file);
>  	while (len > 0) {
>  		sector_t IV;
>  		unsigned size;
> @@ -299,6 +300,7 @@ static int __do_lo_send_write(struct fil
>  
>  	set_fs(get_ds());
>  	bw = file->f_op->write(file, buf, len, &pos);
> +	file_update_time(file);

->write should have already updated the times, no?

quoted text
>  	set_fs(old_fs);
>  	if (likely(bw == len))
>  		return 0;
> 
> 
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