From 9046e979413d3a05057ae9995cebf93eed24f80c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 8 Feb 2012 13:39:15 -0500 Subject: [PATCH] NFSv4: Further reduce the footprint of the idmapper commit 685f50f9188ac1e8244d0340a9d6ea36b6136cec upstream. Don't allocate the legacy idmapper tables until we actually need them. Signed-off-by: Trond Myklebust Reviewed-by: Jeff Layton [bwh: Backported to 3.2: adjust context in nfs_idmap_delete()] Signed-off-by: Ben Hutchings --- fs/nfs/idmap.c | 42 ++++++++++++++++++++++++++++++++++++------ 1 file changed, 36 insertions(+), 6 deletions(-) diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c index b8c41c3f259a..b122af8d7345 100644 --- a/fs/nfs/idmap.c +++ b/fs/nfs/idmap.c @@ -323,7 +323,7 @@ struct idmap_hashent { struct idmap_hashtable { __u8 h_type; - struct idmap_hashent h_entries[IDMAP_HASH_SZ]; + struct idmap_hashent *h_entries; }; struct idmap { @@ -378,20 +378,39 @@ nfs_idmap_new(struct nfs_client *clp) return 0; } +static void +idmap_alloc_hashtable(struct idmap_hashtable *h) +{ + if (h->h_entries != NULL) + return; + h->h_entries = kcalloc(IDMAP_HASH_SZ, + sizeof(*h->h_entries), + GFP_KERNEL); +} + +static void +idmap_free_hashtable(struct idmap_hashtable *h) +{ + int i; + + if (h->h_entries == NULL) + return; + for (i = 0; i < IDMAP_HASH_SZ; i++) + kfree(h->h_entries[i].ih_name); + kfree(h->h_entries); +} + void nfs_idmap_delete(struct nfs_client *clp) { struct idmap *idmap = clp->cl_idmap; - int i; if (!idmap) return; rpc_unlink(idmap->idmap_dentry); 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); + idmap_free_hashtable(&idmap->idmap_user_hash); + idmap_free_hashtable(&idmap->idmap_group_hash); kfree(idmap); } @@ -401,6 +420,8 @@ nfs_idmap_delete(struct nfs_client *clp) static inline struct idmap_hashent * idmap_name_hash(struct idmap_hashtable* h, const char *name, size_t len) { + if (h->h_entries == NULL) + return NULL; return &h->h_entries[fnvhash32(name, len) % IDMAP_HASH_SZ]; } @@ -409,6 +430,8 @@ idmap_lookup_name(struct idmap_hashtable *h, const char *name, size_t len) { struct idmap_hashent *he = idmap_name_hash(h, name, len); + if (he == NULL) + return NULL; if (he->ih_namelen != len || memcmp(he->ih_name, name, len) != 0) return NULL; if (time_after(jiffies, he->ih_expires)) @@ -419,6 +442,8 @@ idmap_lookup_name(struct idmap_hashtable *h, const char *name, size_t len) static inline struct idmap_hashent * idmap_id_hash(struct idmap_hashtable* h, __u32 id) { + if (h->h_entries == NULL) + return NULL; return &h->h_entries[fnvhash32(&id, sizeof(id)) % IDMAP_HASH_SZ]; } @@ -426,6 +451,9 @@ static struct idmap_hashent * idmap_lookup_id(struct idmap_hashtable *h, __u32 id) { struct idmap_hashent *he = idmap_id_hash(h, id); + + if (he == NULL) + return NULL; if (he->ih_id != id || he->ih_namelen == 0) return NULL; if (time_after(jiffies, he->ih_expires)) @@ -441,12 +469,14 @@ idmap_lookup_id(struct idmap_hashtable *h, __u32 id) static inline struct idmap_hashent * idmap_alloc_name(struct idmap_hashtable *h, char *name, size_t len) { + idmap_alloc_hashtable(h); return idmap_name_hash(h, name, len); } static inline struct idmap_hashent * idmap_alloc_id(struct idmap_hashtable *h, __u32 id) { + idmap_alloc_hashtable(h); return idmap_id_hash(h, id); } -- 2.39.5