u32 itemoff;
int ret = 0;
int blk;
+ u8 uuid[BTRFS_UUID_SIZE];
memset(buf->data + sizeof(struct btrfs_header), 0,
cfg->nodesize - sizeof(struct btrfs_header));
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
btrfs_set_item_size(buf, btrfs_item_nr(nritems),
sizeof(root_item));
+ if (blk == MKFS_FS_TREE) {
+ time_t now = time(NULL);
+
+ uuid_generate(uuid);
+ memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+ btrfs_set_stack_timespec_sec(&root_item.otime, now);
+ btrfs_set_stack_timespec_sec(&root_item.ctime, now);
+ } else {
+ memset(uuid, 0, BTRFS_UUID_SIZE);
+ memcpy(root_item.uuid, uuid, BTRFS_UUID_SIZE);
+ btrfs_set_stack_timespec_sec(&root_item.otime, 0);
+ btrfs_set_stack_timespec_sec(&root_item.ctime, 0);
+ }
write_extent_buffer(buf, &root_item,
btrfs_item_ptr_offset(buf, nritems),
sizeof(root_item));
}
/* generate checksum */
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ csum_tree_block_size(buf, btrfs_csum_sizes[BTRFS_CSUM_TYPE_CRC32], 0);
/* write back root tree */
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_ROOT_TREE]);
*
* The superblock signature is not valid, denotes a partially created
* filesystem, needs to be finalized.
+ *
+ * The temporary fs will have the following chunk layout:
+ * Device extent:
+ * 0 1M 5M ......
+ * | Reserved | dev extent for SYS chunk |
+ *
+ * And chunk mapping will be:
+ * Chunk mapping:
+ * 0 1M 5M
+ * | | System chunk, 1:1 mapped |
+ *
+ * That's to say, there will only be *ONE* system chunk, mapped to
+ * [1M, 5M) physical offset.
+ * And the only chunk is also in logical address [1M, 5M), containing
+ * all essential tree blocks.
*/
int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
{
cfg->blocks[MKFS_SUPER_BLOCK] = BTRFS_SUPER_INFO_OFFSET;
for (i = 1; i < MKFS_BLOCK_COUNT; i++) {
- cfg->blocks[i] = BTRFS_SUPER_INFO_OFFSET + SZ_1M +
- cfg->nodesize * i;
+ cfg->blocks[i] = BTRFS_BLOCK_RESERVED_1M_FOR_SUPER +
+ cfg->nodesize * (i - 1);
}
btrfs_set_super_bytenr(&super, cfg->blocks[MKFS_SUPER_BLOCK]);
btrfs_set_super_num_devices(&super, 1);
- btrfs_set_super_magic(&super, BTRFS_MAGIC_PARTIAL);
+ btrfs_set_super_magic(&super, BTRFS_MAGIC_TEMPORARY);
btrfs_set_super_generation(&super, 1);
btrfs_set_super_root(&super, cfg->blocks[MKFS_ROOT_TREE]);
btrfs_set_super_chunk_root(&super, cfg->blocks[MKFS_CHUNK_TREE]);
btrfs_set_header_bytenr(buf, cfg->blocks[MKFS_EXTENT_TREE]);
btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ csum_tree_block_size(buf, btrfs_csum_sizes[BTRFS_CSUM_TYPE_CRC32], 0);
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_EXTENT_TREE]);
if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
/* then we have chunk 0 */
btrfs_set_disk_key_objectid(&disk_key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 0);
+ btrfs_set_disk_key_offset(&disk_key, BTRFS_BLOCK_RESERVED_1M_FOR_SUPER);
btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
btrfs_set_chunk_sector_size(buf, chunk, cfg->sectorsize);
btrfs_set_chunk_num_stripes(buf, chunk, 1);
btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
- btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
+ btrfs_set_stripe_offset_nr(buf, chunk, 0,
+ BTRFS_BLOCK_RESERVED_1M_FOR_SUPER);
nritems++;
write_extent_buffer(buf, super.dev_item.uuid,
btrfs_set_header_bytenr(buf, cfg->blocks[MKFS_CHUNK_TREE]);
btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ csum_tree_block_size(buf, btrfs_csum_sizes[BTRFS_CSUM_TYPE_CRC32], 0);
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_CHUNK_TREE]);
if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
sizeof(struct btrfs_dev_extent);
btrfs_set_disk_key_objectid(&disk_key, 1);
- btrfs_set_disk_key_offset(&disk_key, 0);
+ btrfs_set_disk_key_offset(&disk_key, BTRFS_BLOCK_RESERVED_1M_FOR_SUPER);
btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
BTRFS_CHUNK_TREE_OBJECTID);
btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
BTRFS_FIRST_CHUNK_TREE_OBJECTID);
- btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
+ btrfs_set_dev_extent_chunk_offset(buf, dev_extent,
+ BTRFS_BLOCK_RESERVED_1M_FOR_SUPER);
write_extent_buffer(buf, chunk_tree_uuid,
(unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
btrfs_set_header_bytenr(buf, cfg->blocks[MKFS_DEV_TREE]);
btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ csum_tree_block_size(buf, btrfs_csum_sizes[BTRFS_CSUM_TYPE_CRC32], 0);
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_DEV_TREE]);
if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
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_CRC32_SIZE, 0);
+ csum_tree_block_size(buf, btrfs_csum_sizes[BTRFS_CSUM_TYPE_CRC32], 0);
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_FS_TREE]);
if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
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_CRC32_SIZE, 0);
+ csum_tree_block_size(buf, btrfs_csum_sizes[BTRFS_CSUM_TYPE_CRC32], 0);
ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[MKFS_CSUM_TREE]);
if (ret != cfg->nodesize) {
ret = (ret < 0 ? -errno : -EIO);
memset(buf->data, 0, BTRFS_SUPER_INFO_SIZE);
memcpy(buf->data, &super, sizeof(super));
buf->len = BTRFS_SUPER_INFO_SIZE;
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ csum_tree_block_size(buf, btrfs_csum_sizes[BTRFS_CSUM_TYPE_CRC32], 0);
ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE,
cfg->blocks[MKFS_SUPER_BLOCK]);
if (ret != BTRFS_SUPER_INFO_SIZE) {
/*
* Minimal size calculation is complex due to several factors:
+ * 0) Reserved 1M range.
+ *
* 1) Temporary chunk reuse
* If specified chunk profile is SINGLE, we can reuse
* temporary chunks, no need to allocate new chunks.
* The latter two are all 8M, accroding to @calc_size of
* btrfs_alloc_chunk().
*/
- reserved += BTRFS_MKFS_SYSTEM_GROUP_SIZE + SZ_8M * 2;
+ reserved += BTRFS_BLOCK_RESERVED_1M_FOR_SUPER +
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE + SZ_8M * 2;
/*
* For real chunks, we need to select different sizes:
/* check if the device is busy */
fd = open(file, O_RDWR|O_EXCL);
if (fd < 0) {
- error("unable to open %s: %s", file, strerror(errno));
+ error("unable to open %s: %m", file);
return 1;
}
if (fstat(fd, &st)) {
- error("unable to stat %s: %s", file, strerror(errno));
+ error("unable to stat %s: %m", file);
close(fd);
return 1;
}
projects / platform / upstream / btrfs-progs.git / blobdiff