um: hostfs: use a kmem cache for inodes

This collects all of them together and makes it possible to
e.g. exclude it from slub debugging.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index aea35459d3903159655ee869f144c16acff22fe8..4a5beca6eaa8e413c4677c08ded58b175e13664b 100644 (file)
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -34,6 +34,8 @@ static inline struct hostfs_inode_info *HOSTFS_I(struct inode *inode)
 
 #define FILE_HOSTFS_I(file) HOSTFS_I(file_inode(file))
 
+static struct kmem_cache *hostfs_inode_cache;
+
 /* Changed in hostfs_args before the kernel starts running */
 static char *root_ino = "";
 static int append = 0;
@@ -221,7 +223,7 @@ static struct inode *hostfs_alloc_inode(struct super_block *sb)
 {
        struct hostfs_inode_info *hi;
 
-       hi = kmalloc(sizeof(*hi), GFP_KERNEL_ACCOUNT);
+       hi = kmem_cache_alloc(hostfs_inode_cache, GFP_KERNEL_ACCOUNT);
        if (hi == NULL)
                return NULL;
        hi->fd = -1;
@@ -243,7 +245,7 @@ static void hostfs_evict_inode(struct inode *inode)
 
 static void hostfs_free_inode(struct inode *inode)
 {
-       kfree(HOSTFS_I(inode));
+       kmem_cache_free(hostfs_inode_cache, HOSTFS_I(inode));
 }
 
 static int hostfs_show_options(struct seq_file *seq, struct dentry *root)
@@ -986,12 +988,16 @@ MODULE_ALIAS_FS("hostfs");
 
 static int __init init_hostfs(void)
 {
+       hostfs_inode_cache = KMEM_CACHE(hostfs_inode_info, 0);
+       if (!hostfs_inode_cache)
+               return -ENOMEM;
        return register_filesystem(&hostfs_type);
 }
 
 static void __exit exit_hostfs(void)
 {
        unregister_filesystem(&hostfs_type);
+       kmem_cache_destroy(hostfs_inode_cache);
 }
 
 module_init(init_hostfs)