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btrfs-progs: Introduce function to initialize device tree 

Introduce new function, setup_temp_device_tree(), to setup temporary
device tree for make_btrfs_v2().

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2016-01-29 13:03:18 +08:00 committed by David Sterba
parent 56f26c533e
commit f0a81c88d0
1 changed files with 55 additions and 1 deletions
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56
utils.c
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@ -603,6 +603,59 @@ out:
return ret;
}
static void insert_temp_dev_extent(struct extent_buffer *buf,
int *slot, u32 *itemoff, u64 start, u64 len)
{
struct btrfs_dev_extent *dev_extent;
struct btrfs_disk_key disk_key;
btrfs_set_header_nritems(buf, *slot + 1);
(*itemoff) -= sizeof(*dev_extent);
btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
btrfs_set_disk_key_objectid(&disk_key, 1);
btrfs_set_disk_key_offset(&disk_key, start);
btrfs_set_item_key(buf, &disk_key, *slot);
btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(*dev_extent));
dev_extent = btrfs_item_ptr(buf, *slot, struct btrfs_dev_extent);
btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
BTRFS_FIRST_CHUNK_TREE_OBJECTID);
btrfs_set_dev_extent_length(buf, dev_extent, len);
btrfs_set_dev_extent_chunk_offset(buf, dev_extent, start);
btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
BTRFS_CHUNK_TREE_OBJECTID);
(*slot)++;
}
static int setup_temp_dev_tree(int fd, struct btrfs_mkfs_config *cfg,
u64 sys_chunk_start, u64 meta_chunk_start,
u64 dev_bytenr)
{
struct extent_buffer *buf = NULL;
u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
int slot = 0;
int ret;
/* Must ensure SYS chunk starts before META chunk */
BUG_ON(meta_chunk_start < sys_chunk_start);
buf = malloc(sizeof(*buf) + cfg->nodesize);
if (!buf)
return -ENOMEM;
ret = setup_temp_extent_buffer(buf, cfg, dev_bytenr,
BTRFS_DEV_TREE_OBJECTID);
if (ret < 0)
goto out;
insert_temp_dev_extent(buf, &slot, &itemoff, sys_chunk_start,
BTRFS_MKFS_SYSTEM_GROUP_SIZE);
insert_temp_dev_extent(buf, &slot, &itemoff, meta_chunk_start,
BTRFS_CONVERT_META_GROUP_SIZE);
ret = write_temp_extent_buffer(fd, buf, dev_bytenr);
out:
free(buf);
return ret;
}
/*
* Improved version of make_btrfs().
*
@ -696,7 +749,8 @@ static int make_convert_btrfs(int fd, struct btrfs_mkfs_config *cfg,
chunk_bytenr);
if (ret < 0)
goto out;
ret = setup_temp_dev_tree(fd, cfg, sys_chunk_start, meta_chunk_start,
dev_bytenr);
out:
return ret;
}