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authorChris Mason <chris.mason@oracle.com>2008-04-22 17:22:07 +0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 19:04:02 +0400
commitb30757178dad19a0388d958ff9eea66e674d39ed (patch)
treede2ff27889daaa15180d49d3d04474cc8ee1f927 /fs/btrfs/volumes.h
parent3c12ac7205d4bd679fefa722aa9b61385e4b4749 (diff)
downloadlinux-b30757178dad19a0388d958ff9eea66e674d39ed.tar.xz
Btrfs: Add a special device list for chunk allocations
This allows other code that needs to walk every device in the FS to do so without locking against allocations. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
-rw-r--r--fs/btrfs/volumes.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index dfe7e8a9507c..a2660d2b6b34 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -24,9 +24,12 @@
struct buffer_head;
struct btrfs_device {
struct list_head dev_list;
+ struct list_head dev_alloc_list;
struct btrfs_root *dev_root;
struct buffer_head *pending_io;
+
int barriers;
+
spinlock_t io_lock;
struct block_device *bdev;
@@ -70,7 +73,11 @@ struct btrfs_fs_devices {
u64 num_devices;
struct block_device *latest_bdev;
struct block_device *lowest_bdev;
+ /* all of the devices in the FS */
struct list_head devices;
+
+ /* devices not currently being allocated */
+ struct list_head alloc_list;
struct list_head list;
};