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Btrfs: Add support for device scanning and detection ioctls

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-03-24 15:02:07 -04:00
parent 239b14b32d
commit 8a4b83cc8b
7 changed files with 333 additions and 44 deletions
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25
fs/btrfs/volumes.h
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@ -24,6 +24,8 @@ struct btrfs_device {
struct block_device *bdev;
char *name;
/* the internal btrfs device id */
u64 devid;
@ -49,6 +51,20 @@ struct btrfs_device {
u8 uuid[BTRFS_DEV_UUID_SIZE];
};
struct btrfs_fs_devices {
u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
/* the device with this id has the most recent coyp of the super */
u64 latest_devid;
u64 latest_trans;
u64 lowest_devid;
u64 num_devices;
struct block_device *latest_bdev;
struct block_device *lowest_bdev;
struct list_head devices;
struct list_head list;
};
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
struct btrfs_device *device,
u64 owner, u64 num_bytes, u64 *start);
@ -67,4 +83,13 @@ int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
u64 logical, u64 *phys, u64 *length,
struct btrfs_device **dev);
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
int flags, void *holder);
int btrfs_scan_one_device(const char *path, int flags, void *holder,
struct btrfs_fs_devices **fs_devices_ret);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
int btrfs_add_device(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_device *device);
int btrfs_cleanup_fs_uuids(void);
#endif