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cifs: fix actimeo=0 corner case when cifs_i->time == jiffies

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actimeo=0 is supposed to be a special case that ensures that inode
attributes are always refetched from the server instead of trusting the
cache. The cifs code however uses time_in_range() to determine whether
the attributes have timed out. In the case where cifs_i->time equals
jiffies, this leads to the cifs code not refetching the inode attributes
when it should.

Fix this by explicitly testing for actimeo=0, and handling it as a
special case.

Reported-and-tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton 2014-03-26 07:24:23 -07:00 committed by Steve French
parent 76429f1ded
commit a87c9ad956
1 changed files with 3 additions and 0 deletions
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3
fs/cifs/inode.c
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@ -1737,6 +1737,9 @@ cifs_inode_needs_reval(struct inode *inode)
if (cifs_i->time == 0)
return true;
if (!cifs_sb->actimeo)
return true;
if (!time_in_range(jiffies, cifs_i->time,
cifs_i->time + cifs_sb->actimeo))
return true;