1 files changed, 14 insertions, 6 deletions

diff --git a/fs/file_table.c b/fs/file_table.c
index 5ad0eca6eea2..bbeeac6efa1a 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -32,11 +32,16 @@ struct files_stat_struct files_stat = {
 /* public. Not pretty! */
 __cacheline_aligned_in_smp DEFINE_SPINLOCK(files_lock);
 
+/* SLAB cache for file structures */
+static struct kmem_cache *filp_cachep __read_mostly;
+
 static struct percpu_counter nr_files __cacheline_aligned_in_smp;
 
 static inline void file_free_rcu(struct rcu_head *head)
 {
-        struct file *f =  container_of(head, struct file, f_u.fu_rcuhead);
+        struct file *f = container_of(head, struct file, f_u.fu_rcuhead);
+
+        put_cred(f->f_cred);
         kmem_cache_free(filp_cachep, f);
 }
 
@@ -94,7 +99,7 @@ int proc_nr_files(ctl_table *table, int write, struct file *filp,
  */
 struct file *get_empty_filp(void)
 {
-        struct task_struct *tsk;
+        const struct cred *cred = current_cred();
         static int old_max;
         struct file * f;
 
@@ -118,12 +123,10 @@ struct file *get_empty_filp(void)
         if (security_file_alloc(f))
                 goto fail_sec;
 
-        tsk = current;
         INIT_LIST_HEAD(&f->f_u.fu_list);
         atomic_long_set(&f->f_count, 1);
         rwlock_init(&f->f_owner.lock);
-        f->f_uid = tsk->fsuid;
-        f->f_gid = tsk->fsgid;
+        f->f_cred = get_cred(cred);
         eventpoll_init_file(f);
         /* f->f_version: 0 */
         return f;
@@ -397,7 +400,12 @@ too_bad:
 void __init files_init(unsigned long mempages)
 { 
         int n; 
-        /* One file with associated inode and dcache is very roughly 1K. 
+
+        filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,
+                        SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
+
+        /*
+         * One file with associated inode and dcache is very roughly 1K.
          * Per default don't use more than 10% of our memory for files. 
          */