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NFSv4: Reduce the footprint of the idmapper 

Instead of pre-allocating the storage for all the strings, we can
significantly reduce the size of that table by doing the allocation
when we do the downcall.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
This commit is contained in:
Trond Myklebust 2012-02-07 14:59:05 -05:00
parent 7ced286e0a
commit d073e9b541
1 changed files with 13 additions and 3 deletions
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16
fs/nfs/idmap.c
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@ -362,7 +362,7 @@ struct idmap_hashent {
unsigned long ih_expires;
__u32 ih_id;
size_t ih_namelen;
char ih_name[IDMAP_NAMESZ];
const char *ih_name;
};
struct idmap_hashtable {
@ -482,12 +482,17 @@ void
nfs_idmap_delete(struct nfs_client *clp)
{
struct idmap *idmap = clp->cl_idmap;
int i;
if (!idmap)
return;
nfs_idmap_unregister(clp, idmap->idmap_pipe);
rpc_destroy_pipe_data(idmap->idmap_pipe);
clp->cl_idmap = NULL;
for (i = 0; i < ARRAY_SIZE(idmap->idmap_user_hash.h_entries); i++)
kfree(idmap->idmap_user_hash.h_entries[i].ih_name);
for (i = 0; i < ARRAY_SIZE(idmap->idmap_group_hash.h_entries); i++)
kfree(idmap->idmap_group_hash.h_entries[i].ih_name);
kfree(idmap);
}
@ -634,9 +639,14 @@ static void
idmap_update_entry(struct idmap_hashent *he, const char *name,
size_t namelen, __u32 id)
{
char *str = kmalloc(namelen + 1, GFP_KERNEL);
if (str == NULL)
return;
kfree(he->ih_name);
he->ih_id = id;
memcpy(he->ih_name, name, namelen);
he->ih_name[namelen] = '\0';
memcpy(str, name, namelen);
str[namelen] = '\0';
he->ih_name = str;
he->ih_namelen = namelen;
he->ih_expires = jiffies + nfs_idmap_cache_timeout;
}