@echo " [LN] $@"
$(Q)$(LN_S) -f $^ $@
-mkfs.btrfs: $(objects) $(libs_static) mkfs/main.o
+mkfs.btrfs: $(objects) $(libs_static) mkfs/main.o mkfs/common.o
@echo " [LD] $@"
- $(Q)$(CC) $(CFLAGS) -o mkfs.btrfs $(objects) $(libs_static) mkfs/main.o $(LDFLAGS) $(LIBS)
+ $(Q)$(CC) $(CFLAGS) -o mkfs.btrfs $(objects) $(libs_static) \
+ mkfs/main.o mkfs/common.o $(LDFLAGS) $(LIBS)
-mkfs.btrfs.static: $(static_objects) mkfs/main.static.o $(static_libbtrfs_objects)
+mkfs.btrfs.static: $(static_objects) mkfs/main.static.o mkfs/common.static.o $(static_libbtrfs_objects)
@echo " [LD] $@"
- $(Q)$(CC) $(STATIC_CFLAGS) -o mkfs.btrfs.static mkfs/main.static.o $(static_objects) \
+ $(Q)$(CC) $(STATIC_CFLAGS) -o mkfs.btrfs.static \
+ mkfs/main.static.o mkfs/common.static.o $(static_objects) \
$(static_libbtrfs_objects) $(STATIC_LDFLAGS) $(STATIC_LIBS)
btrfstune: $(objects) $(libs_static) btrfstune.o
--- /dev/null
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <unistd.h>
+#include <uuid/uuid.h>
+#include "ctree.h"
+#include "disk-io.h"
+#include "volumes.h"
+#include "utils.h"
+#include "mkfs/common.h"
+
+static u64 reference_root_table[] = {
+ [1] = BTRFS_ROOT_TREE_OBJECTID,
+ [2] = BTRFS_EXTENT_TREE_OBJECTID,
+ [3] = BTRFS_CHUNK_TREE_OBJECTID,
+ [4] = BTRFS_DEV_TREE_OBJECTID,
+ [5] = BTRFS_FS_TREE_OBJECTID,
+ [6] = BTRFS_CSUM_TREE_OBJECTID,
+};
+
+/*
+ * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
+ *
+ * The superblock signature is not valid, denotes a partially created
+ * filesystem, needs to be finalized.
+ */
+int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
+{
+ struct btrfs_super_block super;
+ struct extent_buffer *buf;
+ struct btrfs_root_item root_item;
+ struct btrfs_disk_key disk_key;
+ struct btrfs_extent_item *extent_item;
+ struct btrfs_inode_item *inode_item;
+ struct btrfs_chunk *chunk;
+ struct btrfs_dev_item *dev_item;
+ struct btrfs_dev_extent *dev_extent;
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ u8 *ptr;
+ int i;
+ int ret;
+ u32 itemoff;
+ u32 nritems = 0;
+ u64 first_free;
+ u64 ref_root;
+ u32 array_size;
+ u32 item_size;
+ int skinny_metadata = !!(cfg->features &
+ BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
+ u64 num_bytes;
+
+ buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
+ if (!buf)
+ return -ENOMEM;
+
+ first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
+ first_free &= ~((u64)cfg->sectorsize - 1);
+
+ memset(&super, 0, sizeof(super));
+
+ num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
+ if (*cfg->fs_uuid) {
+ if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
+ error("cannot not parse UUID: %s", cfg->fs_uuid);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (!test_uuid_unique(cfg->fs_uuid)) {
+ error("non-unique UUID: %s", cfg->fs_uuid);
+ ret = -EBUSY;
+ goto out;
+ }
+ } else {
+ uuid_generate(super.fsid);
+ uuid_unparse(super.fsid, cfg->fs_uuid);
+ }
+ uuid_generate(super.dev_item.uuid);
+ uuid_generate(chunk_tree_uuid);
+
+ btrfs_set_super_bytenr(&super, cfg->blocks[0]);
+ btrfs_set_super_num_devices(&super, 1);
+ btrfs_set_super_magic(&super, BTRFS_MAGIC_PARTIAL);
+ btrfs_set_super_generation(&super, 1);
+ btrfs_set_super_root(&super, cfg->blocks[1]);
+ btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
+ btrfs_set_super_total_bytes(&super, num_bytes);
+ btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
+ btrfs_set_super_sectorsize(&super, cfg->sectorsize);
+ btrfs_set_super_leafsize(&super, cfg->nodesize);
+ btrfs_set_super_nodesize(&super, cfg->nodesize);
+ btrfs_set_super_stripesize(&super, cfg->stripesize);
+ btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
+ btrfs_set_super_chunk_root_generation(&super, 1);
+ btrfs_set_super_cache_generation(&super, -1);
+ btrfs_set_super_incompat_flags(&super, cfg->features);
+ if (cfg->label)
+ __strncpy_null(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
+
+ /* create the tree of root objects */
+ memset(buf->data, 0, cfg->nodesize);
+ buf->len = cfg->nodesize;
+ btrfs_set_header_bytenr(buf, cfg->blocks[1]);
+ btrfs_set_header_nritems(buf, 4);
+ btrfs_set_header_generation(buf, 1);
+ btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
+ btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
+ write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
+ BTRFS_FSID_SIZE);
+
+ write_extent_buffer(buf, chunk_tree_uuid,
+ btrfs_header_chunk_tree_uuid(buf),
+ BTRFS_UUID_SIZE);
+
+ /* create the items for the root tree */
+ memset(&root_item, 0, sizeof(root_item));
+ inode_item = &root_item.inode;
+ btrfs_set_stack_inode_generation(inode_item, 1);
+ btrfs_set_stack_inode_size(inode_item, 3);
+ btrfs_set_stack_inode_nlink(inode_item, 1);
+ btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
+ btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
+ btrfs_set_root_refs(&root_item, 1);
+ btrfs_set_root_used(&root_item, cfg->nodesize);
+ btrfs_set_root_generation(&root_item, 1);
+
+ memset(&disk_key, 0, sizeof(disk_key));
+ btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ nritems = 0;
+
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
+ nritems), sizeof(root_item));
+ nritems++;
+
+ itemoff = itemoff - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item,
+ btrfs_item_ptr_offset(buf, nritems),
+ sizeof(root_item));
+ nritems++;
+
+ itemoff = itemoff - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item,
+ btrfs_item_ptr_offset(buf, nritems),
+ sizeof(root_item));
+ nritems++;
+
+ itemoff = itemoff - sizeof(root_item);
+ btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(root_item));
+ write_extent_buffer(buf, &root_item,
+ btrfs_item_ptr_offset(buf, nritems),
+ sizeof(root_item));
+ nritems++;
+
+
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* create the items for the extent tree */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ nritems = 0;
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
+ for (i = 1; i < 7; i++) {
+ item_size = sizeof(struct btrfs_extent_item);
+ if (!skinny_metadata)
+ item_size += sizeof(struct btrfs_tree_block_info);
+
+ if (cfg->blocks[i] < first_free) {
+ error("block[%d] below first free: %llu < %llu",
+ i, (unsigned long long)cfg->blocks[i],
+ (unsigned long long)first_free);
+ ret = -EINVAL;
+ goto out;
+ }
+ if (cfg->blocks[i] < cfg->blocks[i - 1]) {
+ error("blocks %d and %d in reverse order: %llu < %llu",
+ i, i - 1,
+ (unsigned long long)cfg->blocks[i],
+ (unsigned long long)cfg->blocks[i - 1]);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* create extent item */
+ itemoff -= item_size;
+ btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
+ if (skinny_metadata) {
+ btrfs_set_disk_key_type(&disk_key,
+ BTRFS_METADATA_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ } else {
+ btrfs_set_disk_key_type(&disk_key,
+ BTRFS_EXTENT_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
+ }
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
+ itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems),
+ item_size);
+ extent_item = btrfs_item_ptr(buf, nritems,
+ struct btrfs_extent_item);
+ btrfs_set_extent_refs(buf, extent_item, 1);
+ btrfs_set_extent_generation(buf, extent_item, 1);
+ btrfs_set_extent_flags(buf, extent_item,
+ BTRFS_EXTENT_FLAG_TREE_BLOCK);
+ nritems++;
+
+ /* create extent ref */
+ ref_root = reference_root_table[i];
+ btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
+ btrfs_set_disk_key_offset(&disk_key, ref_root);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
+ itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
+ nritems++;
+ }
+ btrfs_set_header_bytenr(buf, cfg->blocks[2]);
+ btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, nritems);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* create the chunk tree */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ nritems = 0;
+ item_size = sizeof(*dev_item);
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
+
+ /* first device 1 (there is no device 0) */
+ btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
+ btrfs_set_disk_key_offset(&disk_key, 1);
+ btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
+ btrfs_set_item_key(buf, &disk_key, nritems);
+ btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
+ btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
+
+ dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
+ btrfs_set_device_id(buf, dev_item, 1);
+ btrfs_set_device_generation(buf, dev_item, 0);
+ btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
+ btrfs_set_device_bytes_used(buf, dev_item,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
+ btrfs_set_device_type(buf, dev_item, 0);
+
+ write_extent_buffer(buf, super.dev_item.uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+ write_extent_buffer(buf, super.fsid,
+ (unsigned long)btrfs_device_fsid(dev_item),
+ BTRFS_UUID_SIZE);
+ read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
+ sizeof(*dev_item));
+
+ nritems++;
+ item_size = btrfs_chunk_item_size(1);
+ itemoff = itemoff - item_size;
+
+ /* 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_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_item_size(buf, btrfs_item_nr(nritems), item_size);
+
+ chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
+ btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_chunk_stripe_len(buf, chunk, BTRFS_STRIPE_LEN);
+ btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
+ btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
+ btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
+ 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);
+ nritems++;
+
+ write_extent_buffer(buf, super.dev_item.uuid,
+ (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
+ BTRFS_UUID_SIZE);
+
+ /* copy the key for the chunk to the system array */
+ ptr = super.sys_chunk_array;
+ array_size = sizeof(disk_key);
+
+ memcpy(ptr, &disk_key, sizeof(disk_key));
+ ptr += sizeof(disk_key);
+
+ /* copy the chunk to the system array */
+ read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
+ array_size += item_size;
+ ptr += item_size;
+ btrfs_set_super_sys_array_size(&super, array_size);
+
+ btrfs_set_header_bytenr(buf, cfg->blocks[3]);
+ btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, nritems);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* create the device tree */
+ memset(buf->data + sizeof(struct btrfs_header), 0,
+ cfg->nodesize - sizeof(struct btrfs_header));
+ nritems = 0;
+ itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
+ 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_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_set_item_size(buf, btrfs_item_nr(nritems),
+ sizeof(struct btrfs_dev_extent));
+ dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
+ btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
+ 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);
+
+ write_extent_buffer(buf, chunk_tree_uuid,
+ (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
+ BTRFS_UUID_SIZE);
+
+ btrfs_set_dev_extent_length(buf, dev_extent,
+ BTRFS_MKFS_SYSTEM_GROUP_SIZE);
+ nritems++;
+
+ btrfs_set_header_bytenr(buf, cfg->blocks[4]);
+ btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, nritems);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* 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[5]);
+ btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, 0);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ 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[6]);
+ btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
+ btrfs_set_header_nritems(buf, 0);
+ csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
+ ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
+ if (ret != cfg->nodesize) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ /* and write out the super block */
+ 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);
+ ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
+ if (ret != BTRFS_SUPER_INFO_SIZE) {
+ ret = (ret < 0 ? -errno : -EIO);
+ goto out;
+ }
+
+ ret = 0;
+
+out:
+ free(buf);
+ return ret;
+}
+
return 0;
}
-static u64 reference_root_table[] = {
- [1] = BTRFS_ROOT_TREE_OBJECTID,
- [2] = BTRFS_EXTENT_TREE_OBJECTID,
- [3] = BTRFS_CHUNK_TREE_OBJECTID,
- [4] = BTRFS_DEV_TREE_OBJECTID,
- [5] = BTRFS_FS_TREE_OBJECTID,
- [6] = BTRFS_CSUM_TREE_OBJECTID,
-};
-
int test_uuid_unique(char *fs_uuid)
{
int unique = 1;
return ret;
}
-/*
- * @fs_uuid - if NULL, generates a UUID, returns back the new filesystem UUID
- *
- * The superblock signature is not valid, denotes a partially created
- * filesystem, needs to be finalized.
- */
-int make_btrfs(int fd, struct btrfs_mkfs_config *cfg)
-{
- struct btrfs_super_block super;
- struct extent_buffer *buf;
- struct btrfs_root_item root_item;
- struct btrfs_disk_key disk_key;
- struct btrfs_extent_item *extent_item;
- struct btrfs_inode_item *inode_item;
- struct btrfs_chunk *chunk;
- struct btrfs_dev_item *dev_item;
- struct btrfs_dev_extent *dev_extent;
- u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
- u8 *ptr;
- int i;
- int ret;
- u32 itemoff;
- u32 nritems = 0;
- u64 first_free;
- u64 ref_root;
- u32 array_size;
- u32 item_size;
- int skinny_metadata = !!(cfg->features &
- BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
- u64 num_bytes;
-
- buf = malloc(sizeof(*buf) + max(cfg->sectorsize, cfg->nodesize));
- if (!buf)
- return -ENOMEM;
-
- first_free = BTRFS_SUPER_INFO_OFFSET + cfg->sectorsize * 2 - 1;
- first_free &= ~((u64)cfg->sectorsize - 1);
-
- memset(&super, 0, sizeof(super));
-
- num_bytes = (cfg->num_bytes / cfg->sectorsize) * cfg->sectorsize;
- if (*cfg->fs_uuid) {
- if (uuid_parse(cfg->fs_uuid, super.fsid) != 0) {
- error("cannot not parse UUID: %s", cfg->fs_uuid);
- ret = -EINVAL;
- goto out;
- }
- if (!test_uuid_unique(cfg->fs_uuid)) {
- error("non-unique UUID: %s", cfg->fs_uuid);
- ret = -EBUSY;
- goto out;
- }
- } else {
- uuid_generate(super.fsid);
- uuid_unparse(super.fsid, cfg->fs_uuid);
- }
- uuid_generate(super.dev_item.uuid);
- uuid_generate(chunk_tree_uuid);
-
- btrfs_set_super_bytenr(&super, cfg->blocks[0]);
- btrfs_set_super_num_devices(&super, 1);
- btrfs_set_super_magic(&super, BTRFS_MAGIC_PARTIAL);
- btrfs_set_super_generation(&super, 1);
- btrfs_set_super_root(&super, cfg->blocks[1]);
- btrfs_set_super_chunk_root(&super, cfg->blocks[3]);
- btrfs_set_super_total_bytes(&super, num_bytes);
- btrfs_set_super_bytes_used(&super, 6 * cfg->nodesize);
- btrfs_set_super_sectorsize(&super, cfg->sectorsize);
- btrfs_set_super_leafsize(&super, cfg->nodesize);
- btrfs_set_super_nodesize(&super, cfg->nodesize);
- btrfs_set_super_stripesize(&super, cfg->stripesize);
- btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
- btrfs_set_super_chunk_root_generation(&super, 1);
- btrfs_set_super_cache_generation(&super, -1);
- btrfs_set_super_incompat_flags(&super, cfg->features);
- if (cfg->label)
- __strncpy_null(super.label, cfg->label, BTRFS_LABEL_SIZE - 1);
-
- /* create the tree of root objects */
- memset(buf->data, 0, cfg->nodesize);
- buf->len = cfg->nodesize;
- btrfs_set_header_bytenr(buf, cfg->blocks[1]);
- btrfs_set_header_nritems(buf, 4);
- btrfs_set_header_generation(buf, 1);
- btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
- btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
- write_extent_buffer(buf, super.fsid, btrfs_header_fsid(),
- BTRFS_FSID_SIZE);
-
- write_extent_buffer(buf, chunk_tree_uuid,
- btrfs_header_chunk_tree_uuid(buf),
- BTRFS_UUID_SIZE);
-
- /* create the items for the root tree */
- memset(&root_item, 0, sizeof(root_item));
- inode_item = &root_item.inode;
- btrfs_set_stack_inode_generation(inode_item, 1);
- btrfs_set_stack_inode_size(inode_item, 3);
- btrfs_set_stack_inode_nlink(inode_item, 1);
- btrfs_set_stack_inode_nbytes(inode_item, cfg->nodesize);
- btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
- btrfs_set_root_refs(&root_item, 1);
- btrfs_set_root_used(&root_item, cfg->nodesize);
- btrfs_set_root_generation(&root_item, 1);
-
- memset(&disk_key, 0, sizeof(disk_key));
- btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- nritems = 0;
-
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[2]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
- nritems), sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[4]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[5]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
- itemoff = itemoff - sizeof(root_item);
- btrfs_set_root_bytenr(&root_item, cfg->blocks[6]);
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(root_item));
- write_extent_buffer(buf, &root_item,
- btrfs_item_ptr_offset(buf, nritems),
- sizeof(root_item));
- nritems++;
-
-
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[1]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the items for the extent tree */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize);
- for (i = 1; i < 7; i++) {
- item_size = sizeof(struct btrfs_extent_item);
- if (!skinny_metadata)
- item_size += sizeof(struct btrfs_tree_block_info);
-
- if (cfg->blocks[i] < first_free) {
- error("block[%d] below first free: %llu < %llu",
- i, (unsigned long long)cfg->blocks[i],
- (unsigned long long)first_free);
- ret = -EINVAL;
- goto out;
- }
- if (cfg->blocks[i] < cfg->blocks[i - 1]) {
- error("blocks %d and %d in reverse order: %llu < %llu",
- i, i - 1,
- (unsigned long long)cfg->blocks[i],
- (unsigned long long)cfg->blocks[i - 1]);
- ret = -EINVAL;
- goto out;
- }
-
- /* create extent item */
- itemoff -= item_size;
- btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
- if (skinny_metadata) {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_METADATA_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, 0);
- } else {
- btrfs_set_disk_key_type(&disk_key,
- BTRFS_EXTENT_ITEM_KEY);
- btrfs_set_disk_key_offset(&disk_key, cfg->nodesize);
- }
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems),
- item_size);
- extent_item = btrfs_item_ptr(buf, nritems,
- struct btrfs_extent_item);
- btrfs_set_extent_refs(buf, extent_item, 1);
- btrfs_set_extent_generation(buf, extent_item, 1);
- btrfs_set_extent_flags(buf, extent_item,
- BTRFS_EXTENT_FLAG_TREE_BLOCK);
- nritems++;
-
- /* create extent ref */
- ref_root = reference_root_table[i];
- btrfs_set_disk_key_objectid(&disk_key, cfg->blocks[i]);
- btrfs_set_disk_key_offset(&disk_key, ref_root);
- btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems),
- itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), 0);
- nritems++;
- }
- btrfs_set_header_bytenr(buf, cfg->blocks[2]);
- btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[2]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the chunk tree */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- nritems = 0;
- item_size = sizeof(*dev_item);
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) - item_size;
-
- /* first device 1 (there is no device 0) */
- btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
- btrfs_set_disk_key_offset(&disk_key, 1);
- btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
- btrfs_set_item_key(buf, &disk_key, nritems);
- btrfs_set_item_offset(buf, btrfs_item_nr(nritems), itemoff);
- btrfs_set_item_size(buf, btrfs_item_nr(nritems), item_size);
-
- dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
- btrfs_set_device_id(buf, dev_item, 1);
- btrfs_set_device_generation(buf, dev_item, 0);
- btrfs_set_device_total_bytes(buf, dev_item, num_bytes);
- btrfs_set_device_bytes_used(buf, dev_item,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- btrfs_set_device_io_align(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_io_width(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_sector_size(buf, dev_item, cfg->sectorsize);
- btrfs_set_device_type(buf, dev_item, 0);
-
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_device_uuid(dev_item),
- BTRFS_UUID_SIZE);
- write_extent_buffer(buf, super.fsid,
- (unsigned long)btrfs_device_fsid(dev_item),
- BTRFS_UUID_SIZE);
- read_extent_buffer(buf, &super.dev_item, (unsigned long)dev_item,
- sizeof(*dev_item));
-
- nritems++;
- item_size = btrfs_chunk_item_size(1);
- itemoff = itemoff - item_size;
-
- /* 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_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_item_size(buf, btrfs_item_nr(nritems), item_size);
-
- chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
- btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- btrfs_set_chunk_owner(buf, chunk, BTRFS_EXTENT_TREE_OBJECTID);
- btrfs_set_chunk_stripe_len(buf, chunk, BTRFS_STRIPE_LEN);
- btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM);
- btrfs_set_chunk_io_align(buf, chunk, cfg->sectorsize);
- btrfs_set_chunk_io_width(buf, chunk, cfg->sectorsize);
- 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);
- nritems++;
-
- write_extent_buffer(buf, super.dev_item.uuid,
- (unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
- BTRFS_UUID_SIZE);
-
- /* copy the key for the chunk to the system array */
- ptr = super.sys_chunk_array;
- array_size = sizeof(disk_key);
-
- memcpy(ptr, &disk_key, sizeof(disk_key));
- ptr += sizeof(disk_key);
-
- /* copy the chunk to the system array */
- read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
- array_size += item_size;
- ptr += item_size;
- btrfs_set_super_sys_array_size(&super, array_size);
-
- btrfs_set_header_bytenr(buf, cfg->blocks[3]);
- btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[3]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* create the device tree */
- memset(buf->data + sizeof(struct btrfs_header), 0,
- cfg->nodesize - sizeof(struct btrfs_header));
- nritems = 0;
- itemoff = __BTRFS_LEAF_DATA_SIZE(cfg->nodesize) -
- 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_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_set_item_size(buf, btrfs_item_nr(nritems),
- sizeof(struct btrfs_dev_extent));
- dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
- btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
- 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);
-
- write_extent_buffer(buf, chunk_tree_uuid,
- (unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
- BTRFS_UUID_SIZE);
-
- btrfs_set_dev_extent_length(buf, dev_extent,
- BTRFS_MKFS_SYSTEM_GROUP_SIZE);
- nritems++;
-
- btrfs_set_header_bytenr(buf, cfg->blocks[4]);
- btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, nritems);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[4]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* 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[5]);
- btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, 0);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[5]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- 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[6]);
- btrfs_set_header_owner(buf, BTRFS_CSUM_TREE_OBJECTID);
- btrfs_set_header_nritems(buf, 0);
- csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
- ret = pwrite(fd, buf->data, cfg->nodesize, cfg->blocks[6]);
- if (ret != cfg->nodesize) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- /* and write out the super block */
- 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);
- ret = pwrite(fd, buf->data, BTRFS_SUPER_INFO_SIZE, cfg->blocks[0]);
- if (ret != BTRFS_SUPER_INFO_SIZE) {
- ret = (ret < 0 ? -errno : -EIO);
- goto out;
- }
-
- ret = 0;
-
-out:
- free(buf);
- return ret;
-}
-
#define VERSION_TO_STRING3(a,b,c) #a "." #b "." #c, KERNEL_VERSION(a,b,c)
#define VERSION_TO_STRING2(a,b) #a "." #b, KERNEL_VERSION(a,b,0)
projects / platform / upstream / btrfs-progs.git / commitdiff