On Wed, 2014-08-20 at 11:42 +0800, Ian Kent wrote: > > > > From 201f75bc25906e8f64e28b37f1bb478958bf2987 Mon Sep 17 00:00:00 2001 > > From: NeilBrown <[email protected]> > > Date: Wed, 20 Aug 2014 12:40:06 +1000 > > Subject: [PATCH] autofs4: make "autofs4_can_expire" idempotent. > > > > Have a "test" function change the value it is testing can > > be confusing, particularly as a future patch will be calling > > this function twice. > > > > So move the update for 'last_used' to avoid repeat expiry > > to the place where the final determination on what to expire is known. > > > > Signed-off-by: NeilBrown <[email protected]> > > > > diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c > > index bee939efca2b..af09dada91bc 100644 > > --- a/fs/autofs4/expire.c > > +++ b/fs/autofs4/expire.c > > @@ -30,12 +30,6 @@ static inline int autofs4_can_expire(struct dentry > > *dentry, > > /* Too young to die */ > > if (!timeout || time_after(ino->last_used + timeout, now)) > > return 0; > > - > > - /* update last_used here :- > > - - obviously makes sense if it is in use now > > - - less obviously, prevents rapid-fire expire > > - attempts if expire fails the first time */ > > - ino->last_used = now; > > } > > return 1; > > } > > @@ -541,6 +535,8 @@ int autofs4_expire_run(struct super_block *sb, > > > > spin_lock(&sbi->fs_lock); > > ino = autofs4_dentry_ino(dentry); > > + /* avoid rapid-fire expire attempts if expiry fails */ > > + ino->last_used = now; > > ino->flags &= ~AUTOFS_INF_EXPIRING; > > complete_all(&ino->expire_complete); > > spin_unlock(&sbi->fs_lock); > > @@ -567,6 +563,8 @@ int autofs4_do_expire_multi(struct super_block *sb, > > struct vfsmount *mnt, > > ret = autofs4_wait(sbi, dentry, NFY_EXPIRE); > > > > spin_lock(&sbi->fs_lock); > > + /* avoid rapid-fire expire attempts if expiry fails */ > > + ino->last_used = now; > > ino->flags &= ~AUTOFS_INF_EXPIRING; > > complete_all(&ino->expire_complete); > > spin_unlock(&sbi->fs_lock); >
On looking a little closer I've set last_used at slightly different locations. It is still does the same thing though. I'm not fussy where we actually do this, so your call. autofs - fix last_used usage From: Ian Kent <[email protected]> Signed-off-by: Ian Kent <[email protected]> --- fs/autofs4/expire.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c index cca5d1e..d97a761 100644 --- a/fs/autofs4/expire.c +++ b/fs/autofs4/expire.c @@ -30,12 +30,6 @@ static inline int autofs4_can_expire(struct dentry *dentry, /* Too young to die */ if (!timeout || time_after(ino->last_used + timeout, now)) return 0; - - /* update last_used here :- - - obviously makes sense if it is in use now - - less obviously, prevents rapid-fire expire - attempts if expire fails the first time */ - ino->last_used = now; } return 1; } @@ -341,6 +335,8 @@ struct dentry *autofs4_expire_direct(struct super_block *sb, ino->flags |= AUTOFS_INF_EXPIRING; smp_mb(); ino->flags &= ~AUTOFS_INF_NO_RCU; + /* Prevent rapid fire expire events */ + ino->last_used = now; init_completion(&ino->expire_complete); spin_unlock(&sbi->fs_lock); return root; @@ -496,6 +492,8 @@ found: ino->flags |= AUTOFS_INF_EXPIRING; smp_mb(); ino->flags &= ~AUTOFS_INF_NO_RCU; + /* Prevent rapid fire expire events */ + ino->last_used = now; init_completion(&ino->expire_complete); spin_unlock(&sbi->fs_lock); spin_lock(&sbi->lookup_lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
