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authorArne Jansen <sensille@gmx.net>2011-04-12 10:43:21 +0200
committerArne Jansen <sensille@gmx.net>2011-05-13 15:36:05 +0200
commitbcd53741cc2af4342ac3ff6983bddc4a1b63b9b4 (patch)
tree5be83348abb93689effda63918fdec4fb0b5461c /fs/btrfs/super.c
parent7cf96da3ec7ca225acf4f284b0e904a1f5f98821 (diff)
downloadop-kernel-dev-bcd53741cc2af4342ac3ff6983bddc4a1b63b9b4.zip
op-kernel-dev-bcd53741cc2af4342ac3ff6983bddc4a1b63b9b4.tar.gz
btrfs: move btrfs_cmp_device_free_bytes to super.c
this function won't be used here anymore, so move it super.c where it is used for df-calculation
Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r--fs/btrfs/super.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 0ac712e..32fe8b3 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -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.
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