forked from Mirrors/btrfs-progs
btrfs-progs: Introduce function to setup temporary chunk root
Introduce new function, setup_temp_chunk_root(), to initialize temporary chunk root for make_btrfs_v2(). Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>master
Qu Wenruo
David Sterba
parent
df20ed3e5e
commit
56f26c533e
171
utils.c
171
utils.c
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@ -436,6 +436,173 @@ out:
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return ret;
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}
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static int insert_temp_dev_item(int fd, struct extent_buffer *buf,
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struct btrfs_mkfs_config *cfg,
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int *slot, u32 *itemoff)
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{
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struct btrfs_disk_key disk_key;
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struct btrfs_dev_item *dev_item;
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char super_buf[BTRFS_SUPER_INFO_SIZE];
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unsigned char dev_uuid[BTRFS_UUID_SIZE];
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unsigned char fsid[BTRFS_FSID_SIZE];
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struct btrfs_super_block *super = (struct btrfs_super_block *)super_buf;
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int ret;
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ret = pread(fd, super_buf, BTRFS_SUPER_INFO_SIZE, cfg->super_bytenr);
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if (ret < BTRFS_SUPER_INFO_SIZE) {
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ret = (ret < 0 ? -errno : -EIO);
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goto out;
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}
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btrfs_set_header_nritems(buf, *slot + 1);
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(*itemoff) -= sizeof(*dev_item);
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/* setup device item 1, 0 is for replace case */
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btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
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btrfs_set_disk_key_offset(&disk_key, 1);
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btrfs_set_item_key(buf, &disk_key, *slot);
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btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(*slot), sizeof(*dev_item));
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dev_item = btrfs_item_ptr(buf, *slot, struct btrfs_dev_item);
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/* Generate device uuid */
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uuid_generate(dev_uuid);
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write_extent_buffer(buf, dev_uuid,
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(unsigned long)btrfs_device_uuid(dev_item),
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BTRFS_UUID_SIZE);
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uuid_parse(cfg->fs_uuid, fsid);
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write_extent_buffer(buf, fsid,
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(unsigned long)btrfs_device_fsid(dev_item),
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BTRFS_FSID_SIZE);
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btrfs_set_device_id(buf, dev_item, 1);
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btrfs_set_device_generation(buf, dev_item, 0);
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btrfs_set_device_total_bytes(buf, dev_item, cfg->num_bytes);
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/*
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* The number must match the initial SYSTEM and META chunk size
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*/
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btrfs_set_device_bytes_used(buf, dev_item,
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BTRFS_MKFS_SYSTEM_GROUP_SIZE +
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BTRFS_CONVERT_META_GROUP_SIZE);
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btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
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btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
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btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
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btrfs_set_device_type(buf, dev_item, 0);
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/* Super dev_item is not complete, copy the complete one to sb */
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read_extent_buffer(buf, &super->dev_item, (unsigned long)dev_item,
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sizeof(*dev_item));
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ret = write_temp_super(fd, super, cfg->super_bytenr);
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(*slot)++;
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out:
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return ret;
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}
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static int insert_temp_chunk_item(int fd, struct extent_buffer *buf,
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struct btrfs_mkfs_config *cfg,
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int *slot, u32 *itemoff, u64 start, u64 len,
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u64 type)
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{
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struct btrfs_chunk *chunk;
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struct btrfs_disk_key disk_key;
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char super_buf[BTRFS_SUPER_INFO_SIZE];
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struct btrfs_super_block *sb = (struct btrfs_super_block *)super_buf;
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int ret = 0;
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ret = pread(fd, super_buf, BTRFS_SUPER_INFO_SIZE,
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cfg->super_bytenr);
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if (ret < BTRFS_SUPER_INFO_SIZE) {
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ret = (ret < 0 ? ret : -EIO);
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return ret;
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}
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btrfs_set_header_nritems(buf, *slot + 1);
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(*itemoff) -= btrfs_chunk_item_size(1);
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btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
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btrfs_set_disk_key_offset(&disk_key, start);
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btrfs_set_item_key(buf, &disk_key, *slot);
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btrfs_set_item_offset(buf, btrfs_item_nr(*slot), *itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(*slot),
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btrfs_chunk_item_size(1));
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chunk = btrfs_item_ptr(buf, *slot, struct btrfs_chunk);
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btrfs_set_chunk_length(buf, chunk, len);
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btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
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btrfs_set_chunk_stripe_len(buf, chunk, 64 * 1024);
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btrfs_set_chunk_type(buf, chunk, type);
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btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
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btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
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btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
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btrfs_set_chunk_num_stripes(buf, chunk, 1);
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/* TODO: Support DUP profile for system chunk */
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btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
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/* We are doing 1:1 mapping, so start is its dev offset */
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btrfs_set_stripe_offset_nr(buf, chunk, 0, start);
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write_extent_buffer(buf, &sb->dev_item.uuid,
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(unsigned long)btrfs_stripe_dev_uuid_nr(chunk, 0),
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BTRFS_UUID_SIZE);
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(*slot)++;
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/*
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* If it's system chunk, also copy it to super block.
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*/
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if (type & BTRFS_BLOCK_GROUP_SYSTEM) {
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char *cur;
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cur = (char *)sb->sys_chunk_array + sb->sys_chunk_array_size;
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memcpy(cur, &disk_key, sizeof(disk_key));
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cur += sizeof(disk_key);
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read_extent_buffer(buf, cur, (unsigned long int)chunk,
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btrfs_chunk_item_size(1));
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sb->sys_chunk_array_size += btrfs_chunk_item_size(1) +
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sizeof(disk_key);
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ret = write_temp_super(fd, sb, cfg->super_bytenr);
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}
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return ret;
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}
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static int setup_temp_chunk_tree(int fd, struct btrfs_mkfs_config *cfg,
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u64 sys_chunk_start, u64 meta_chunk_start,
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u64 chunk_bytenr)
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{
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struct extent_buffer *buf = NULL;
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u32 itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
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int slot = 0;
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int ret;
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/* Must ensure SYS chunk starts before META chunk */
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BUG_ON(meta_chunk_start < sys_chunk_start);
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buf = malloc(sizeof(*buf) + cfg->nodesize);
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if (!buf)
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return -ENOMEM;
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ret = setup_temp_extent_buffer(buf, cfg, chunk_bytenr,
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BTRFS_CHUNK_TREE_OBJECTID);
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if (ret < 0)
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goto out;
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ret = insert_temp_dev_item(fd, buf, cfg, &slot, &itemoff);
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if (ret < 0)
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goto out;
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ret = insert_temp_chunk_item(fd, buf, cfg, &slot, &itemoff,
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sys_chunk_start,
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BTRFS_MKFS_SYSTEM_GROUP_SIZE,
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BTRFS_BLOCK_GROUP_SYSTEM);
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if (ret < 0)
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goto out;
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ret = insert_temp_chunk_item(fd, buf, cfg, &slot, &itemoff,
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meta_chunk_start,
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BTRFS_CONVERT_META_GROUP_SIZE,
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BTRFS_BLOCK_GROUP_METADATA);
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if (ret < 0)
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goto out;
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ret = write_temp_extent_buffer(fd, buf, chunk_bytenr);
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out:
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free(buf);
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return ret;
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}
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/*
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* Improved version of make_btrfs().
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*
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@ -525,6 +692,10 @@ static int make_convert_btrfs(int fd, struct btrfs_mkfs_config *cfg,
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dev_bytenr, fs_bytenr, csum_bytenr);
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if (ret < 0)
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goto out;
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ret = setup_temp_chunk_tree(fd, cfg, sys_chunk_start, meta_chunk_start,
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chunk_bytenr);
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if (ret < 0)
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goto out;
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out:
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return ret;
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