Btrfs: check if there is enough space for balancing smarter

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / btrfs / extent-tree.c

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 059dfa0..a3e71b5 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6728,6 +6728,10 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
        struct btrfs_space_info *space_info;
        struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
        struct btrfs_device *device;
+       u64 min_free;
+       int index;
+       int dev_nr = 0;
+       int dev_min = 1;
        int full = 0;
        int ret = 0;
 
@@ -6737,8 +6741,10 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
        if (!block_group)
                return -1;
 
+       min_free = btrfs_block_group_used(&block_group->item);
+
        /* no bytes used, we're good */
-       if (!btrfs_block_group_used(&block_group->item))
+       if (!min_free)
                goto out;
 
        space_info = block_group->space_info;
@@ -6754,10 +6760,9 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
         * all of the extents from this block group.  If we can, we're good
         */
        if ((space_info->total_bytes != block_group->key.offset) &&
-          (space_info->bytes_used + space_info->bytes_reserved +
-           space_info->bytes_pinned + space_info->bytes_readonly +
-           btrfs_block_group_used(&block_group->item) <
-           space_info->total_bytes)) {
+           (space_info->bytes_used + space_info->bytes_reserved +
+            space_info->bytes_pinned + space_info->bytes_readonly +
+            min_free < space_info->total_bytes)) {
                spin_unlock(&space_info->lock);
                goto out;
        }
@@ -6774,9 +6779,29 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
        if (full)
                goto out;
 
+       /*
+        * index:
+        *      0: raid10
+        *      1: raid1
+        *      2: dup
+        *      3: raid0
+        *      4: single
+        */
+       index = get_block_group_index(block_group);
+       if (index == 0) {
+               dev_min = 4;
+               min_free /= 2;
+       } else if (index == 1) {
+               dev_min = 2;
+       } else if (index == 2) {
+               min_free *= 2;
+       } else if (index == 3) {
+               dev_min = fs_devices->rw_devices;
+               min_free /= dev_min;
+       }
+
        mutex_lock(&root->fs_info->chunk_mutex);
        list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
-               u64 min_free = btrfs_block_group_used(&block_group->item);
                u64 dev_offset;
 
                /*
@@ -6787,7 +6812,11 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
                        ret = find_free_dev_extent(NULL, device, min_free,
                                                   &dev_offset, NULL);
                        if (!ret)
+                               dev_nr++;
+
+                       if (dev_nr >= dev_min)
                                break;
+
                        ret = -1;
                }
        }