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Btrfs: use the inode own lock to protect its delalloc_bytes

PATCH Superseded Miao Xie 1 participant 1 message Jan 10, 2013 Btrfs file system

v1 of 2 Superseded Latest is v2 →

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Miao Xie

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PATCH 8/11 Btrfs: use the inode own lock to protect its delalloc_bytes

We need not use a global lock to protect the delalloc_bytes of the inode, just use its own lock. In this way, we can reduce the lock contention and ->delalloc_lock will just protect delalloc inode list.

Signed-off-by Miao Xie <[email protected]>
---
 fs/btrfs/btrfs_inode.h |  1 +
 fs/btrfs/disk-io.c     |  2 ++
 fs/btrfs/inode.c       | 47 ++++++++++++++++++++++++++++++++++-------------
 3 files changed, 37 insertions(+), 13 deletions(-)
fs/btrfs/btrfs_inode.h +1 -0
index 2a8c242..c935a77 100644
@@ -40,6 +40,7 @@
 #define BTRFS_INODE_HAS_ASYNC_EXTENT		6
 #define BTRFS_INODE_NEEDS_FULL_SYNC		7
 #define BTRFS_INODE_COPY_EVERYTHING		8
+#define BTRFS_INODE_IN_DELALLOC_LIST		9
 
 /* in memory btrfs inode */
 struct btrfs_inode {
fs/btrfs/disk-io.c +2 -0
index 750afd4..748ce06 100644
@@ -3685,6 +3685,8 @@ static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
 				    delalloc_inodes);
 
 		list_del_init(&btrfs_inode->delalloc_inodes);
+		clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
+			  &btrfs_inode->runtime_flags);
 
 		btrfs_invalidate_inodes(btrfs_inode->root);
 	}
fs/btrfs/inode.c +34 -13

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