btrfs: cleanup fs_devices pointer usage in btrfs_trim_fs

Drop variable 'devices' (used only once) and add new variable for
the fs_devices, so it is used at two locations within btrfs_trim_fs()
function and also helps to access fs_devices->devices.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 268ce58..d5925be 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5950,9 +5950,9 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, u64 *trimmed)
  */
 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
 {
+       struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
        struct btrfs_block_group *cache = NULL;
        struct btrfs_device *device;
-       struct list_head *devices;
        u64 group_trimmed;
        u64 range_end = U64_MAX;
        u64 start;
@@ -6016,9 +6016,9 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
                btrfs_warn(fs_info,
                        "failed to trim %llu block group(s), last error %d",
                        bg_failed, bg_ret);
-       mutex_lock(&fs_info->fs_devices->device_list_mutex);
-       devices = &fs_info->fs_devices->devices;
-       list_for_each_entry(device, devices, dev_list) {
+
+       mutex_lock(&fs_devices->device_list_mutex);
+       list_for_each_entry(device, &fs_devices->devices, dev_list) {
                if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
                        continue;
 
@@ -6031,7 +6031,7 @@ int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range)
 
                trimmed += group_trimmed;
        }
-       mutex_unlock(&fs_info->fs_devices->device_list_mutex);
+       mutex_unlock(&fs_devices->device_list_mutex);
 
        if (dev_failed)
                btrfs_warn(fs_info,