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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-02-07 14:59:05 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-02-15 00:19:50 -0500
commitd073e9b541e1ac3f52d72c3a153855d9a9ee3278 (patch)
tree4719e9b10b9df0416523577d5008045198ad8633 /fs/nfs/idmap.c
parent7ced286e0ade171af89d32c22b1590e1ca480542 (diff)
downloadlinux-d073e9b541e1ac3f52d72c3a153855d9a9ee3278.tar.bz2
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>
Diffstat (limited to 'fs/nfs/idmap.c')
-rw-r--r--fs/nfs/idmap.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 5a5566fa1619..fff79481218c 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -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;
}