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NFSv4: Keep dropped state owners on the LRU list for a while

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To ensure that we don't reuse their identifiers.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-04-21 12:36:19 -04:00
parent c77365c963
commit 7bf97bc273
1 changed files with 11 additions and 9 deletions
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20
fs/nfs/nfs4state.c
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@ -521,6 +521,14 @@ out:
/**
* nfs4_put_state_owner - Release a nfs4_state_owner
* @sp: state owner data to release
*
* Note that we keep released state owners on an LRU
* list.
* This caches valid state owners so that they can be
* reused, to avoid the OPEN_CONFIRM on minor version 0.
* It also pins the uniquifier of dropped state owners for
* a while, to ensure that those state owner names are
* never reused.
*/
void nfs4_put_state_owner(struct nfs4_state_owner *sp)
{
@ -530,15 +538,9 @@ void nfs4_put_state_owner(struct nfs4_state_owner *sp)
if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock))
return;
if (!RB_EMPTY_NODE(&sp->so_server_node)) {
sp->so_expires = jiffies;
list_add_tail(&sp->so_lru, &server->state_owners_lru);
spin_unlock(&clp->cl_lock);
} else {
nfs4_remove_state_owner_locked(sp);
spin_unlock(&clp->cl_lock);
nfs4_free_state_owner(sp);
}
sp->so_expires = jiffies;
list_add_tail(&sp->so_lru, &server->state_owners_lru);
spin_unlock(&clp->cl_lock);
}
/**