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author | Chris Mason <chris.mason@oracle.com> | 2011-05-22 16:36:34 (GMT) |
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committer | Chris Mason <chris.mason@oracle.com> | 2011-05-22 16:36:34 (GMT) |
commit | aa2dfb372a2a647beedac163ce6f8b0fcbefac29 (patch) | |
tree | ff64f4d4921df2f0fbe5b356dc9b2384c7957dc1 /fs/btrfs/super.c | |
parent | 945d8962ceee6bb273365d0bdf42f763225b290f (diff) | |
parent | 73c5de0051533cbdf2bb656586c3eb21a475aa7d (diff) | |
download | linux-fsl-qoriq-aa2dfb372a2a647beedac163ce6f8b0fcbefac29.tar.xz |
Merge branch 'allocator' of git://git.kernel.org/pub/scm/linux/kernel/git/arne/btrfs-unstable-arne into inode_numbers
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r-- | fs/btrfs/super.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index fb72e2b..006655c 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -914,6 +914,32 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data) return 0; } +/* Used to sort the devices by max_avail(descending sort) */ +static int btrfs_cmp_device_free_bytes(const void *dev_info1, + const void *dev_info2) +{ + if (((struct btrfs_device_info *)dev_info1)->max_avail > + ((struct btrfs_device_info *)dev_info2)->max_avail) + return -1; + else if (((struct btrfs_device_info *)dev_info1)->max_avail < + ((struct btrfs_device_info *)dev_info2)->max_avail) + return 1; + else + return 0; +} + +/* + * 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); +} + /* * The helper to calc the free space on the devices that can be used to store * file data. |