forked from Minki/linux
Btrfs: don't add extent 0 to the free space cache v2
If block group 0 is completely free, btrfs_read_block_groups will add extent [0, BTRFS_SUPER_INFO_OFFSET) to the free space cache. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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06b2331f83
@ -195,6 +195,14 @@ static int exclude_super_stripes(struct btrfs_root *root,
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int stripe_len;
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int i, nr, ret;
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if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) {
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stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid;
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cache->bytes_super += stripe_len;
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ret = add_excluded_extent(root, cache->key.objectid,
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stripe_len);
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BUG_ON(ret);
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}
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for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
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bytenr = btrfs_sb_offset(i);
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ret = btrfs_rmap_block(&root->fs_info->mapping_tree,
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@ -255,7 +263,7 @@ static u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
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if (ret)
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break;
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if (extent_start == start) {
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if (extent_start <= start) {
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start = extent_end + 1;
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} else if (extent_start > start && extent_start < end) {
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size = extent_start - start;
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