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btrfs: move btrfs_cmp_device_free_bytes to super.c

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this function won't be used here anymore, so move it super.c where it is
used for df-calculation
This commit is contained in:
Arne Jansen
2011-04-12 10:43:21 +02:00
parent 7cf96da3ec
commit bcd53741cc
3 changed files with 26 additions and 28 deletions
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26
fs/btrfs/super.c
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@@ -913,6 +913,32 @@ 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.