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btrfs: convert while loop to list_for_each_entry 

No functional changes, just make the loop a bit more readable

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2017-06-27 10:02:24 +03:00 committed by David Sterba
parent ef954844c7
commit ebcc9301ea
1 changed files with 2 additions and 9 deletions
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11
fs/btrfs/volumes.c
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@ -4629,7 +4629,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
{
struct btrfs_fs_info *info = trans->fs_info;
struct btrfs_fs_devices *fs_devices = info->fs_devices;
struct list_head *cur;
struct btrfs_device *device;
struct map_lookup *map = NULL;
struct extent_map_tree *em_tree;
struct extent_map *em;
@ -4703,22 +4703,15 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
if (!devices_info)
return -ENOMEM;
cur = fs_devices->alloc_list.next;
/*
* in the first pass through the devices list, we gather information
* about the available holes on each device.
*/
ndevs = 0;
while (cur != &fs_devices->alloc_list) {
struct btrfs_device *device;
list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
u64 max_avail;
u64 dev_offset;
device = list_entry(cur, struct btrfs_device, dev_alloc_list);
cur = cur->next;
if (!device->writeable) {
WARN(1, KERN_ERR
"BTRFS: read-only device in alloc_list\n");