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NFSv4.1 move deviceid cache to filelayout driver

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No need for generic cache with only one user.
Keep a simple hash of deviceids in the filelayout driver.

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Acked-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Christoph Hellwig
2011-03-01 01:34:21 +00:00
committed by Trond Myklebust
parent cbdabc7f8b
commit ea8eecdd11
6 changed files with 92 additions and 264 deletions
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147
fs/nfs/pnfs.c
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@@ -75,10 +75,8 @@ find_pnfs_driver(u32 id)
void
unset_pnfs_layoutdriver(struct nfs_server *nfss)
{
if (nfss->pnfs_curr_ld) {
nfss->pnfs_curr_ld->clear_layoutdriver(nfss);
if (nfss->pnfs_curr_ld)
module_put(nfss->pnfs_curr_ld->owner);
}
nfss->pnfs_curr_ld = NULL;
}
@@ -116,13 +114,7 @@ set_pnfs_layoutdriver(struct nfs_server *server, u32 id)
goto out_no_driver;
}
server->pnfs_curr_ld = ld_type;
if (ld_type->set_layoutdriver(server)) {
printk(KERN_ERR
"%s: Error initializing mount point for layout driver %u.\n",
__func__, id);
module_put(ld_type->owner);
goto out_no_driver;
}
dprintk("%s: pNFS module for %u set\n", __func__, id);
return;
@@ -906,138 +898,3 @@ pnfs_try_to_read_data(struct nfs_read_data *rdata,
dprintk("%s End (trypnfs:%d)\n", __func__, trypnfs);
return trypnfs;
}
/*
* Device ID cache. Currently supports one layout type per struct nfs_client.
* Add layout type to the lookup key to expand to support multiple types.
*/
int
pnfs_alloc_init_deviceid_cache(struct nfs_client *clp,
void (*free_callback)(struct pnfs_deviceid_node *))
{
struct pnfs_deviceid_cache *c;
c = kzalloc(sizeof(struct pnfs_deviceid_cache), GFP_KERNEL);
if (!c)
return -ENOMEM;
spin_lock(&clp->cl_lock);
if (clp->cl_devid_cache != NULL) {
atomic_inc(&clp->cl_devid_cache->dc_ref);
dprintk("%s [kref [%d]]\n", __func__,
atomic_read(&clp->cl_devid_cache->dc_ref));
kfree(c);
} else {
/* kzalloc initializes hlists */
spin_lock_init(&c->dc_lock);
atomic_set(&c->dc_ref, 1);
c->dc_free_callback = free_callback;
clp->cl_devid_cache = c;
dprintk("%s [new]\n", __func__);
}
spin_unlock(&clp->cl_lock);
return 0;
}
EXPORT_SYMBOL_GPL(pnfs_alloc_init_deviceid_cache);
/*
* Called from pnfs_layoutdriver_type->free_lseg
* last layout segment reference frees deviceid
*/
void
pnfs_put_deviceid(struct pnfs_deviceid_cache *c,
struct pnfs_deviceid_node *devid)
{
struct nfs4_deviceid *id = &devid->de_id;
struct pnfs_deviceid_node *d;
struct hlist_node *n;
long h = nfs4_deviceid_hash(id);
dprintk("%s [%d]\n", __func__, atomic_read(&devid->de_ref));
if (!atomic_dec_and_lock(&devid->de_ref, &c->dc_lock))
return;
hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[h], de_node)
if (!memcmp(&d->de_id, id, sizeof(*id))) {
hlist_del_rcu(&d->de_node);
spin_unlock(&c->dc_lock);
synchronize_rcu();
c->dc_free_callback(devid);
return;
}
spin_unlock(&c->dc_lock);
/* Why wasn't it found in the list? */
BUG();
}
EXPORT_SYMBOL_GPL(pnfs_put_deviceid);
/* Find and reference a deviceid */
struct pnfs_deviceid_node *
pnfs_find_get_deviceid(struct pnfs_deviceid_cache *c, struct nfs4_deviceid *id)
{
struct pnfs_deviceid_node *d;
struct hlist_node *n;
long hash = nfs4_deviceid_hash(id);
dprintk("--> %s hash %ld\n", __func__, hash);
rcu_read_lock();
hlist_for_each_entry_rcu(d, n, &c->dc_deviceids[hash], de_node) {
if (!memcmp(&d->de_id, id, sizeof(*id))) {
if (!atomic_inc_not_zero(&d->de_ref)) {
goto fail;
} else {
rcu_read_unlock();
return d;
}
}
}
fail:
rcu_read_unlock();
return NULL;
}
EXPORT_SYMBOL_GPL(pnfs_find_get_deviceid);
/*
* Add a deviceid to the cache.
* GETDEVICEINFOs for same deviceid can race. If deviceid is found, discard new
*/
struct pnfs_deviceid_node *
pnfs_add_deviceid(struct pnfs_deviceid_cache *c, struct pnfs_deviceid_node *new)
{
struct pnfs_deviceid_node *d;
long hash = nfs4_deviceid_hash(&new->de_id);
dprintk("--> %s hash %ld\n", __func__, hash);
spin_lock(&c->dc_lock);
d = pnfs_find_get_deviceid(c, &new->de_id);
if (d) {
spin_unlock(&c->dc_lock);
dprintk("%s [discard]\n", __func__);
c->dc_free_callback(new);
return d;
}
INIT_HLIST_NODE(&new->de_node);
atomic_set(&new->de_ref, 1);
hlist_add_head_rcu(&new->de_node, &c->dc_deviceids[hash]);
spin_unlock(&c->dc_lock);
dprintk("%s [new]\n", __func__);
return new;
}
EXPORT_SYMBOL_GPL(pnfs_add_deviceid);
void
pnfs_put_deviceid_cache(struct nfs_client *clp)
{
struct pnfs_deviceid_cache *local = clp->cl_devid_cache;
dprintk("--> %s ({%d})\n", __func__, atomic_read(&local->dc_ref));
if (atomic_dec_and_lock(&local->dc_ref, &clp->cl_lock)) {
int i;
/* Verify cache is empty */
for (i = 0; i < NFS4_DEVICE_ID_HASH_SIZE; i++)
BUG_ON(!hlist_empty(&local->dc_deviceids[i]));
clp->cl_devid_cache = NULL;
spin_unlock(&clp->cl_lock);
kfree(local);
}
}
EXPORT_SYMBOL_GPL(pnfs_put_deviceid_cache);