diff options
author | Jiri Kosina <jkosina@suse.cz> | 2011-02-15 10:24:31 +0100 |
---|---|---|
committer | Jiri Kosina <jkosina@suse.cz> | 2011-02-15 10:24:31 +0100 |
commit | 0a9d59a2461477bd9ed143c01af9df3f8f00fa81 (patch) | |
tree | df997d1cfb0786427a0df1fbd6f0640fa4248cf4 /fs/btrfs/volumes.h | |
parent | a23ce6da9677d245aa0aadc99f4197030350ab54 (diff) | |
parent | 795abaf1e4e188c4171e3cd3dbb11a9fcacaf505 (diff) | |
download | kernel_samsung_smdk4412-0a9d59a2461477bd9ed143c01af9df3f8f00fa81.zip kernel_samsung_smdk4412-0a9d59a2461477bd9ed143c01af9df3f8f00fa81.tar.gz kernel_samsung_smdk4412-0a9d59a2461477bd9ed143c01af9df3f8f00fa81.tar.bz2 |
Merge branch 'master' into for-next
Diffstat (limited to 'fs/btrfs/volumes.h')
-rw-r--r-- | fs/btrfs/volumes.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 1be7810..7fb59d4 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; @@ -136,6 +139,30 @@ 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); +} + +int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, + u64 end, u64 *length); + #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ (sizeof(struct btrfs_bio_stripe) * (n))) |