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-rw-r--r--fs/locks.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/fs/locks.c b/fs/locks.c
index ae1e7cf721d6..526d5fca67c8 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -202,8 +202,49 @@ static DEFINE_HASHTABLE(blocked_hash, BLOCKED_HASH_BITS);
*/
static DEFINE_SPINLOCK(blocked_lock_lock);
+static struct kmem_cache *flctx_cache __read_mostly;
static struct kmem_cache *filelock_cache __read_mostly;
+static struct file_lock_context *
+locks_get_lock_context(struct inode *inode)
+{
+ struct file_lock_context *new;
+
+ if (likely(inode->i_flctx))
+ goto out;
+
+ new = kmem_cache_alloc(flctx_cache, GFP_KERNEL);
+ if (!new)
+ goto out;
+
+ INIT_LIST_HEAD(&new->flc_flock);
+
+ /*
+ * Assign the pointer if it's not already assigned. If it is, then
+ * free the context we just allocated.
+ */
+ spin_lock(&inode->i_lock);
+ if (likely(!inode->i_flctx)) {
+ inode->i_flctx = new;
+ new = NULL;
+ }
+ spin_unlock(&inode->i_lock);
+
+ if (new)
+ kmem_cache_free(flctx_cache, new);
+out:
+ return inode->i_flctx;
+}
+
+void
+locks_free_lock_context(struct file_lock_context *ctx)
+{
+ if (ctx) {
+ WARN_ON_ONCE(!list_empty(&ctx->flc_flock));
+ kmem_cache_free(flctx_cache, ctx);
+ }
+}
+
static void locks_init_lock_heads(struct file_lock *fl)
{
INIT_HLIST_NODE(&fl->fl_link);
@@ -2636,6 +2677,9 @@ static int __init filelock_init(void)
{
int i;
+ flctx_cache = kmem_cache_create("file_lock_ctx",
+ sizeof(struct file_lock_context), 0, SLAB_PANIC, NULL);
+
filelock_cache = kmem_cache_create("file_lock_cache",
sizeof(struct file_lock), 0, SLAB_PANIC, NULL);