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btrfs-progs: mkfs: add helper for writing empty tree nodes

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With extent tree v2 we're going to be writing some more empty trees for
the initial mkfs step, so take this common code and make it a helper.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-08-23 16:14:50 -04:00 committed by David Sterba
parent 9b4207a0f9
commit 41c3fa5d0b
1 changed files with 25 additions and 22 deletions
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47
mkfs/common.c
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@ -39,6 +39,25 @@ static u64 reference_root_table[] = {
[MKFS_CSUM_TREE] = BTRFS_CSUM_TREE_OBJECTID,
};
static int btrfs_write_empty_tree(int fd, struct btrfs_mkfs_config *cfg,
struct extent_buffer *buf, u64 objectid,
u64 block)
{
int ret;
memset(buf->data + sizeof(struct btrfs_header), 0,
cfg->nodesize - sizeof(struct btrfs_header));
btrfs_set_header_bytenr(buf, block);
btrfs_set_header_owner(buf, objectid);
btrfs_set_header_nritems(buf, 0);
csum_tree_block_size(buf, btrfs_csum_type_size(cfg->csum_type), 0,
cfg->csum_type);
ret = pwrite(fd, buf->data, cfg->nodesize, block);
if (ret != cfg->nodesize)
return ret < 0 ? -errno : -EIO;
return 0;
}
static int btrfs_create_tree_root(int fd, struct btrfs_mkfs_config *cfg,
struct extent_buffer *buf,
const enum btrfs_mkfs_block *blocks,
@ -453,31 +472,15 @@ int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
}
/* create the FS root */
memset(buf->data + sizeof(struct btrfs_header), 0,
cfg->nodesize - sizeof(struct btrfs_header));
btrfs_set_header_bytenr(buf, cfg->blocks[MKFS_FS_TREE]);
btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
btrfs_set_header_nritems(buf, 0);
csum_tree_block_size(buf, btrfs_csum_type_size(cfg->csum_type), 0,
cfg->csum_type);
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_FS_TREE]);
if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
ret = btrfs_write_empty_tree(fd, cfg, buf, BTRFS_FS_TREE_OBJECTID,
cfg->blocks[MKFS_FS_TREE]);
if (ret)
goto out;
}
/* finally create the csum root */
memset(buf->data + sizeof(struct btrfs_header), 0,
cfg->nodesize - sizeof(struct btrfs_header));
btrfs_set_header_bytenr(buf, cfg->blocks[MKFS_CSUM_TREE]);
btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
btrfs_set_header_nritems(buf, 0);
csum_tree_block_size(buf, btrfs_csum_type_size(cfg->csum_type), 0,
cfg->csum_type);
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_CSUM_TREE]);
if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
ret = btrfs_write_empty_tree(fd, cfg, buf, BTRFS_CSUM_TREE_OBJECTID,
cfg->blocks[MKFS_CSUM_TREE]);
if (ret)
goto out;
}
/* and write out the super block */
memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);