diff options
Diffstat (limited to 'fs/btrfs/volumes.h')
| -rw-r--r-- | fs/btrfs/volumes.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index a668c0116982..a5cfedf393f9 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -20,8 +20,11 @@ #define __BTRFS_VOLUMES_ #include <linux/bio.h> +#include <linux/sort.h> #include "async-thread.h" +#define BTRFS_STRIPE_LEN (64 * 1024) + struct buffer_head; struct btrfs_pending_bios { struct bio *head; @@ -137,6 +140,27 @@ struct btrfs_multi_bio { struct btrfs_bio_stripe stripes[]; }; +struct btrfs_device_info { + struct btrfs_device *dev; + u64 dev_offset; + u64 max_avail; +}; + +/* Used to sort the devices by max_avail(descending sort) */ +int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2); + +/* + * sort the devices by max_avail, in which max free extent size of each device + * is stored.(Descending Sort) + */ +static inline void btrfs_descending_sort_devices( + struct btrfs_device_info *devices, + size_t nr_devices) +{ + sort(devices, nr_devices, sizeof(struct btrfs_device_info), + btrfs_cmp_device_free_bytes, NULL); +} + #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ (sizeof(struct btrfs_bio_stripe) * (n))) |