Before this patch, btrfs-convert only rely on large enough initial
system/metadata chunk size to ensure no newer system/meta chunk will be
created.
But that's not safe enough. So add two new members in fs_info,
avoid_sys/meta_chunk_alloc flags to prevent any newer system or meta
chunks to be created before init_btrfs_v2().
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
btrfs-convert.c | 9 +++++++++
ctree.h | 3 +++
extent-tree.c | 10 ++++++++++
3 files changed, 22 insertions(+)
diff --git a/btrfs-convert.c b/btrfs-convert.c
index efa3b02..333f413 100644
--- a/btrfs-convert.c
+++ b/btrfs-convert.c
@@ -2322,6 +2322,13 @@ static int init_btrfs_v2(struct btrfs_mkfs_config *cfg,
struct btrfs_root *root,
struct btrfs_fs_info *fs_info = root->fs_info;
int ret;
+ /*
+ * Don't alloc any metadata/system chunk, as we don't want
+ * any meta/sys chunk allcated before all data chunks are inserted.
+ * Or we screw up the chunk layout just like the old implement.
+ */
+ fs_info->avoid_sys_chunk_alloc = 1;
+ fs_info->avoid_meta_chunk_alloc = 1;
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
ret = btrfs_fix_block_accounting(trans, root);
@@ -2359,6 +2366,8 @@ static int init_btrfs_v2(struct btrfs_mkfs_config *cfg,
struct btrfs_root *root,
goto err;
ret = btrfs_commit_transaction(trans, root);
+ fs_info->avoid_sys_chunk_alloc = 0;
+ fs_info->avoid_meta_chunk_alloc = 0;
err:
return ret;
}
diff --git a/ctree.h b/ctree.h
index 6e3e919..10038be 100644
--- a/ctree.h
+++ b/ctree.h
@@ -1015,6 +1015,9 @@ struct btrfs_fs_info {
unsigned int quota_enabled:1;
unsigned int suppress_check_block_errors:1;
unsigned int ignore_fsid_mismatch:1;
+ unsigned int avoid_meta_chunk_alloc:1;
+ unsigned int avoid_sys_chunk_alloc:1;
+
int (*free_extent_hook)(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
diff --git a/extent-tree.c b/extent-tree.c
index bfc9060..2883785 100644
--- a/extent-tree.c
+++ b/extent-tree.c
@@ -1904,6 +1904,16 @@ static int do_chunk_alloc(struct btrfs_trans_handle
*trans,
thresh)
return 0;
+ /*
+ * Avoid allocating given chunk type
+ */
+ if (extent_root->fs_info->avoid_meta_chunk_alloc &&
+ (flags & BTRFS_BLOCK_GROUP_METADATA))
+ return 0;
+ if (extent_root->fs_info->avoid_sys_chunk_alloc &&
+ (flags & BTRFS_BLOCK_GROUP_SYSTEM))
+ return 0;
+
ret = btrfs_alloc_chunk(trans, extent_root, &start, &num_bytes,
space_info->flags);
if (ret == -ENOSPC) {
--
2.6.2
--
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