Btrfs: use slabs for auto defrag allocation
The auto defrag allocation is in the fast path of the IO, so use slabs
to improve the speed of the allocation.
And besides that, it can do check for leaked objects when the module is removed.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index bd7f1b0..15117ea 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -41,6 +41,7 @@
#include "compat.h"
#include "volumes.h"
+static struct kmem_cache *btrfs_inode_defrag_cachep;
/*
* when auto defrag is enabled we
* queue up these defrag structs to remember which
@@ -127,7 +128,7 @@
return;
exists:
- kfree(defrag);
+ kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
return;
}
@@ -157,7 +158,7 @@
else
transid = BTRFS_I(inode)->root->last_trans;
- defrag = kzalloc(sizeof(*defrag), GFP_NOFS);
+ defrag = kmem_cache_zalloc(btrfs_inode_defrag_cachep, GFP_NOFS);
if (!defrag)
return -ENOMEM;
@@ -169,7 +170,7 @@
if (!test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags))
__btrfs_add_inode_defrag(inode, defrag);
else
- kfree(defrag);
+ kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
spin_unlock(&root->fs_info->defrag_inodes_lock);
return 0;
}
@@ -315,7 +316,8 @@
next:
spin_lock(&fs_info->defrag_inodes_lock);
next_free:
- kfree(defrag);
+ if (defrag)
+ kmem_cache_free(btrfs_inode_defrag_cachep, defrag);
}
spin_unlock(&fs_info->defrag_inodes_lock);
@@ -2293,3 +2295,21 @@
.compat_ioctl = btrfs_ioctl,
#endif
};
+
+void btrfs_auto_defrag_exit(void)
+{
+ if (btrfs_inode_defrag_cachep)
+ kmem_cache_destroy(btrfs_inode_defrag_cachep);
+}
+
+int btrfs_auto_defrag_init(void)
+{
+ btrfs_inode_defrag_cachep = kmem_cache_create("btrfs_inode_defrag",
+ sizeof(struct inode_defrag), 0,
+ SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
+ NULL);
+ if (!btrfs_inode_defrag_cachep)
+ return -ENOMEM;
+
+ return 0;
+}