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* [PATCH resend] Update atime from future.
@ 2011-01-04  8:56 yangsheng
  2011-01-04  9:02 ` Andreas Schwab
  2011-01-04 18:21 ` Valdis.Kletnieks
  0 siblings, 2 replies; 6+ messages in thread
From: yangsheng @ 2011-01-04  8:56 UTC (permalink / raw)
  To: linux-kernel
  Cc: adilger, linux-fsdevel, linux-ext4, swhiteho, yangsheng, sickadm

If atime has been wrong set to future, then it cannot
be updated back to current time.

CC: swhiteho@redhat.com
Signed-off-by: sickadm@gmail.com
Reviewed-by: adilger@dilger.ca
---
 fs/inode.c |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index da85e56..9cf7375 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1446,6 +1446,8 @@ sector_t bmap(struct inode *inode, sector_t block)
 }
 EXPORT_SYMBOL(bmap);
 
+#define RELATIME_MARGIN (24 * 60 * 60)
+
 /*
  * With relative atime, only update atime if the previous atime is
  * earlier than either the ctime or mtime or if at least a day has
@@ -1469,10 +1471,16 @@ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
 		return 1;
 
 	/*
-	 * Is the previous atime value older than a day? If yes,
+	 * Is the previous atime value in future? If yes,
+	 * update atime:
+	 */
+	if ((long)(now.tv_sec - inode->i_atime.tv_sec) < -RELATIME_MARGIN)
+		return 1;
+	/*
+	 * Is the previous atime value old than a day? If yes,
 	 * update atime:
 	 */
-	if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60)
+	if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= RELATIME_MARGIN)
 		return 1;
 	/*
 	 * Good, we can skip the atime update:
-- 
1.7.2.3


^ permalink raw reply related	[flat|nested] 6+ messages in thread

* Re: [PATCH resend] Update atime from future.
  2011-01-04  8:56 [PATCH resend] Update atime from future yangsheng
@ 2011-01-04  9:02 ` Andreas Schwab
  2011-01-04  9:05   ` YangSheng
  2011-01-04 18:21 ` Valdis.Kletnieks
  1 sibling, 1 reply; 6+ messages in thread
From: Andreas Schwab @ 2011-01-04  9:02 UTC (permalink / raw)
  To: yangsheng
  Cc: linux-kernel, adilger, linux-fsdevel, linux-ext4, swhiteho,
	sickadm

yangsheng <sickamd@gmail.com> writes:

> -	 * Is the previous atime value older than a day? If yes,
> +	 * Is the previous atime value old than a day? If yes,

Why did you change that comment?

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH resend] Update atime from future.
  2011-01-04  9:02 ` Andreas Schwab
@ 2011-01-04  9:05   ` YangSheng
  0 siblings, 0 replies; 6+ messages in thread
From: YangSheng @ 2011-01-04  9:05 UTC (permalink / raw)
  To: Andreas Schwab
  Cc: linux-kernel, adilger, linux-fsdevel, linux-ext4, swhiteho,
	sickadm

On 01/04/2011 05:02 PM, Andreas Schwab wrote:
> yangsheng<sickamd@gmail.com>  writes:
>
>    
>> -	 * Is the previous atime value older than a day? If yes,
>> +	 * Is the previous atime value old than a day? If yes,
>>      
> Why did you change that comment?
>    
Sorry, It is a typo. I'll resent it.
> Andreas.
>
>    


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH resend] Update atime from future.
  2011-01-04  8:56 [PATCH resend] Update atime from future yangsheng
  2011-01-04  9:02 ` Andreas Schwab
@ 2011-01-04 18:21 ` Valdis.Kletnieks
  2011-01-04 19:13   ` Andreas Dilger
  1 sibling, 1 reply; 6+ messages in thread
From: Valdis.Kletnieks @ 2011-01-04 18:21 UTC (permalink / raw)
  To: yangsheng
  Cc: linux-kernel, adilger, linux-fsdevel, linux-ext4, swhiteho,
	sickadm

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On Tue, 04 Jan 2011 16:56:58 +0800, yangsheng said:
> If atime has been wrong set to future, then it cannot
> be updated back to current time.

> +#define RELATIME_MARGIN (24 * 60 * 60)

Nice patch overall.  Should this be a #define, or a CONFIG_ variable,
or a tweakable /proc/sys/fs variable?  Or am I senile and we thrashed
all this out once before when the relatime code landed?

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^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH resend] Update atime from future.
  2011-01-04 18:21 ` Valdis.Kletnieks
@ 2011-01-04 19:13   ` Andreas Dilger
  2011-01-04 20:31     ` Valdis.Kletnieks
  0 siblings, 1 reply; 6+ messages in thread
From: Andreas Dilger @ 2011-01-04 19:13 UTC (permalink / raw)
  To: Valdis.Kletnieks
  Cc: yangsheng, linux-kernel, linux-fsdevel, linux-ext4, swhiteho,
	sickadm

On 2011-01-04, at 11:21, Valdis.Kletnieks@vt.edu wrote:
> On Tue, 04 Jan 2011 16:56:58 +0800, yangsheng said:
>> If atime has been wrong set to future, then it cannot
>> be updated back to current time.
>> 
>> +#define RELATIME_MARGIN (24 * 60 * 60)
> 
> Nice patch overall.  Should this be a #define, or a CONFIG_ variable,
> or a tweakable /proc/sys/fs variable?  Or am I senile and we thrashed
> all this out once before when the relatime code landed?

I recall the consensus was that a /proc tunable was "too much" for the initial patch.  An atime update interval of 1 day is sufficient for most applications, since they run daily to do file access scanning.  The #define was added because I dislike having multiple hard-coded values in any code.

I haven't heard of any complaints about the relatime update frequency, except for this "atime in the future" problem, so until that happens we may as well leave it as-is.

Cheers, Andreas

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH resend] Update atime from future.
  2011-01-04 19:13   ` Andreas Dilger
@ 2011-01-04 20:31     ` Valdis.Kletnieks
  0 siblings, 0 replies; 6+ messages in thread
From: Valdis.Kletnieks @ 2011-01-04 20:31 UTC (permalink / raw)
  To: Andreas Dilger
  Cc: yangsheng, linux-kernel, linux-fsdevel, linux-ext4, swhiteho,
	sickadm

[-- Attachment #1: Type: text/plain, Size: 681 bytes --]

On Tue, 04 Jan 2011 12:13:37 MST, Andreas Dilger said:
> On 2011-01-04, at 11:21, Valdis.Kletnieks@vt.edu wrote:
> > On Tue, 04 Jan 2011 16:56:58 +0800, yangsheng said:
> >> If atime has been wrong set to future, then it cannot
> >> be updated back to current time.
> >>
> >> +#define RELATIME_MARGIN (24 * 60 * 60)
> >
> > Nice patch overall.  Should this be a #define, or a CONFIG_ variable,
> > or a tweakable /proc/sys/fs variable?  Or am I senile and we thrashed
> > all this out once before when the relatime code landed?
> 
> I recall the consensus was that a /proc tunable was "too much" for the
> initial patch.

OK, in that case yangsheng's patch is probably good to go.

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^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2011-01-04 20:31 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-01-04  8:56 [PATCH resend] Update atime from future yangsheng
2011-01-04  9:02 ` Andreas Schwab
2011-01-04  9:05   ` YangSheng
2011-01-04 18:21 ` Valdis.Kletnieks
2011-01-04 19:13   ` Andreas Dilger
2011-01-04 20:31     ` Valdis.Kletnieks

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