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svcrpc: free contexts immediately on PROC_DESTROY

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We currently handle a client PROC_DESTROY request by turning it
CACHE_NEGATIVE, setting the expired time to now, and then waiting for
cache_clean to clean it up later.  Since we forgot to set the cache's
nextcheck value, that could take up to 30 minutes.  Also, though there's
probably no real bug in this case, setting CACHE_NEGATIVE directly like
this probably isn't a great idea in general.

So let's just remove the entry from the cache directly, and move this
bit of cache manipulation to a helper function.

Signed-off-by: Neil Brown <neilb@suse.com>
Reported-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Neil Brown 2016-12-22 12:38:06 -05:00 committed by J. Bruce Fields
parent 034dd34ff4
commit 2b477c00f3
3 changed files with 15 additions and 2 deletions
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1
include/linux/sunrpc/cache.h
View file

@ -227,6 +227,7 @@ extern void sunrpc_destroy_cache_detail(struct cache_detail *cd);
extern int sunrpc_cache_register_pipefs(struct dentry *parent, const char *,
umode_t, struct cache_detail *);
extern void sunrpc_cache_unregister_pipefs(struct cache_detail *);
extern void sunrpc_cache_unhash(struct cache_detail *, struct cache_head *);
/* Must store cache_detail in seq_file->private if using next three functions */
extern void *cache_seq_start(struct seq_file *file, loff_t *pos);

4
net/sunrpc/auth_gss/svcauth_gss.c
View file

@ -1489,8 +1489,8 @@ svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
case RPC_GSS_PROC_DESTROY:
if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
goto auth_err;
rsci->h.expiry_time = seconds_since_boot();
set_bit(CACHE_NEGATIVE, &rsci->h.flags);
/* Delete the entry from the cache_list and call cache_put */
sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
if (resv->iov_len + 4 > PAGE_SIZE)
goto drop;
svc_putnl(resv, RPC_SUCCESS);

12
net/sunrpc/cache.c
View file

@ -1855,3 +1855,15 @@ void sunrpc_cache_unregister_pipefs(struct cache_detail *cd)
}
EXPORT_SYMBOL_GPL(sunrpc_cache_unregister_pipefs);
void sunrpc_cache_unhash(struct cache_detail *cd, struct cache_head *h)
{
write_lock(&cd->hash_lock);
if (!hlist_unhashed(&h->cache_list)){
hlist_del_init(&h->cache_list);
cd->entries--;
write_unlock(&cd->hash_lock);
cache_put(h, cd);
} else
write_unlock(&cd->hash_lock);
}
EXPORT_SYMBOL_GPL(sunrpc_cache_unhash);