[PATCH 06/13] tmpfs: time granularity fix for [acm]time going backwards

[Chris Wright <chrisw@sous-sol.org>]

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-stable review patch.  If anyone has any objections, please let us know.
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From: Robin H. Johnson <robbat2@gentoo.org>

I noticed a strange behavior in a tmpfs file system the other day, while
building packages - occasionally, and seemingly at random, make decided to
rebuild a target. However, only on tmpfs.

A file would be created, and if checked, it had a sub-second timestamp.
However, after an utimes related call where sub-seconds should be set, they
were zeroed instead. In the case that a file was created, and utimes(...,NULL)
was used on it in the same second, the timestamp on the file moved backwards.

After some digging, I found that this was being caused by tmpfs not having a
time granularity set, thus inheriting the default 1 second granularity.

Hugh adds: yes, we missed tmpfs when the s_time_gran mods went into 2.6.11.
Unfortunately, the granularity of CURRENT_TIME, often used in filesystems,
does not match the default granularity set by alloc_super.  A few more such
discrepancies have been found, but this is the most important to fix now.

Signed-off-by: Robin H. Johnson <robbat2@gentoo.org>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 mm/shmem.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-2.6.16.21.orig/mm/shmem.c
+++ linux-2.6.16.21/mm/shmem.c
@@ -2100,6 +2100,7 @@ static int shmem_fill_super(struct super
 	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 	sb->s_magic = TMPFS_MAGIC;
 	sb->s_op = &shmem_ops;
+	sb->s_time_gran = 1;
 
 	inode = shmem_get_inode(sb, S_IFDIR | mode, 0);
 	if (!inode)

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