| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| * |
| * 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. |
| */ |
| |
| #define _XOPEN_SOURCE 600 |
| #define __USE_XOPEN2K |
| #include <stdio.h> |
| #include <stdlib.h> |
| #ifndef __CHECKER__ |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #endif |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <uuid/uuid.h> |
| #include <dirent.h> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <mntent.h> |
| #include "kerncompat.h" |
| #include "radix-tree.h" |
| #include "ctree.h" |
| #include "disk-io.h" |
| #include "transaction.h" |
| #include "crc32c.h" |
| #include "utils.h" |
| #include "volumes.h" |
| #include "ioctl.h" |
| |
| #ifdef __CHECKER__ |
| #define BLKGETSIZE64 0 |
| static inline int ioctl(int fd, int define, u64 *size) { return 0; } |
| #endif |
| |
| static u64 reference_root_table[6] = { |
| [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, |
| }; |
| |
| int make_btrfs(int fd, const char *device, const char *label, |
| u64 blocks[6], u64 num_bytes, u32 nodesize, |
| u32 leafsize, u32 sectorsize, u32 stripesize) |
| { |
| struct btrfs_super_block super; |
| struct extent_buffer *buf; |
| struct btrfs_root_item root_item; |
| struct btrfs_disk_key disk_key; |
| struct btrfs_extent_ref *extent_ref; |
| 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 hash; |
| u64 first_free; |
| u64 ref_gen; |
| u64 ref_root; |
| u32 array_size; |
| u32 item_size; |
| |
| first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1; |
| first_free &= ~((u64)sectorsize - 1); |
| |
| memset(&super, 0, sizeof(super)); |
| |
| num_bytes = (num_bytes / sectorsize) * sectorsize; |
| uuid_generate(super.fsid); |
| uuid_generate(super.dev_item.uuid); |
| uuid_generate(chunk_tree_uuid); |
| |
| btrfs_set_super_bytenr(&super, blocks[0]); |
| btrfs_set_super_num_devices(&super, 1); |
| strncpy((char *)&super.magic, BTRFS_MAGIC, sizeof(super.magic)); |
| btrfs_set_super_generation(&super, 1); |
| btrfs_set_super_root(&super, blocks[1]); |
| btrfs_set_super_chunk_root(&super, blocks[3]); |
| btrfs_set_super_total_bytes(&super, num_bytes); |
| btrfs_set_super_bytes_used(&super, first_free + 5 * leafsize); |
| btrfs_set_super_sectorsize(&super, sectorsize); |
| btrfs_set_super_leafsize(&super, leafsize); |
| btrfs_set_super_nodesize(&super, nodesize); |
| btrfs_set_super_stripesize(&super, stripesize); |
| if (label) |
| strcpy(super.label, label); |
| |
| buf = malloc(sizeof(*buf) + max(sectorsize, leafsize)); |
| |
| /* create the tree of root objects */ |
| memset(buf->data, 0, leafsize); |
| buf->len = leafsize; |
| btrfs_set_header_bytenr(buf, blocks[1]); |
| btrfs_set_header_nritems(buf, 3); |
| btrfs_set_header_generation(buf, 1); |
| btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID); |
| write_extent_buffer(buf, super.fsid, (unsigned long) |
| btrfs_header_fsid(buf), BTRFS_FSID_SIZE); |
| |
| write_extent_buffer(buf, chunk_tree_uuid, (unsigned long) |
| 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_nblocks(inode_item, 1); |
| btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); |
| btrfs_set_root_refs(&root_item, 1); |
| btrfs_set_root_used(&root_item, leafsize); |
| |
| 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(leafsize) - sizeof(root_item); |
| btrfs_set_root_bytenr(&root_item, 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(buf, nritems), itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, 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, 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(buf, nritems), itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, 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, 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(buf, nritems), itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), |
| sizeof(root_item)); |
| write_extent_buffer(buf, &root_item, |
| btrfs_item_ptr_offset(buf, nritems), |
| sizeof(root_item)); |
| nritems++; |
| |
| |
| csum_tree_block(NULL, buf, 0); |
| ret = pwrite(fd, buf->data, leafsize, blocks[1]); |
| BUG_ON(ret != leafsize); |
| |
| /* create the items for the extent tree */ |
| nritems = 0; |
| itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - |
| sizeof(struct btrfs_extent_item); |
| btrfs_set_disk_key_objectid(&disk_key, 0); |
| btrfs_set_disk_key_offset(&disk_key, first_free); |
| btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY); |
| btrfs_set_item_key(buf, &disk_key, nritems); |
| btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), |
| sizeof(struct btrfs_extent_item)); |
| extent_item = btrfs_item_ptr(buf, nritems, struct btrfs_extent_item); |
| btrfs_set_extent_refs(buf, extent_item, 1); |
| nritems++; |
| for (i = 1; i < 6; i++) { |
| BUG_ON(blocks[i] < first_free); |
| BUG_ON(blocks[i] < blocks[i - 1]); |
| |
| /* create extent item */ |
| itemoff = itemoff - sizeof(struct btrfs_extent_item); |
| btrfs_set_disk_key_objectid(&disk_key, blocks[i]); |
| btrfs_set_disk_key_offset(&disk_key, leafsize); |
| btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY); |
| btrfs_set_item_key(buf, &disk_key, nritems); |
| btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), |
| itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), |
| sizeof(struct btrfs_extent_item)); |
| extent_item = btrfs_item_ptr(buf, nritems, |
| struct btrfs_extent_item); |
| btrfs_set_extent_refs(buf, extent_item, 1); |
| nritems++; |
| |
| /* create extent ref */ |
| ref_root = reference_root_table[i]; |
| if (ref_root == BTRFS_FS_TREE_OBJECTID) |
| ref_gen = 1; |
| else |
| ref_gen = 0; |
| |
| hash = btrfs_hash_extent_ref(ref_root, ref_gen, 0, 0); |
| itemoff = itemoff - sizeof(struct btrfs_extent_ref); |
| btrfs_set_disk_key_objectid(&disk_key, blocks[i]); |
| btrfs_set_disk_key_offset(&disk_key, hash); |
| btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_REF_KEY); |
| btrfs_set_item_key(buf, &disk_key, nritems); |
| btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), |
| itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), |
| sizeof(struct btrfs_extent_ref)); |
| extent_ref = btrfs_item_ptr(buf, nritems, |
| struct btrfs_extent_ref); |
| btrfs_set_ref_root(buf, extent_ref, ref_root); |
| btrfs_set_ref_generation(buf, extent_ref, ref_gen); |
| btrfs_set_ref_objectid(buf, extent_ref, 0); |
| btrfs_set_ref_offset(buf, extent_ref, 0); |
| nritems++; |
| } |
| btrfs_set_header_bytenr(buf, blocks[2]); |
| btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID); |
| btrfs_set_header_nritems(buf, nritems); |
| csum_tree_block(NULL, buf, 0); |
| ret = pwrite(fd, buf->data, leafsize, blocks[2]); |
| BUG_ON(ret != leafsize); |
| |
| /* create the chunk tree */ |
| nritems = 0; |
| item_size = sizeof(*dev_item); |
| itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - 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(buf, nritems), itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, 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_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, sectorsize); |
| btrfs_set_device_io_width(buf, dev_item, sectorsize); |
| btrfs_set_device_sector_size(buf, dev_item, 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); |
| 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(buf, nritems), itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, 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, 64 * 1024); |
| btrfs_set_chunk_type(buf, chunk, BTRFS_BLOCK_GROUP_SYSTEM); |
| btrfs_set_chunk_io_align(buf, chunk, sectorsize); |
| btrfs_set_chunk_io_width(buf, chunk, sectorsize); |
| btrfs_set_chunk_sector_size(buf, chunk, 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, blocks[3]); |
| btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID); |
| btrfs_set_header_nritems(buf, nritems); |
| csum_tree_block(NULL, buf, 0); |
| ret = pwrite(fd, buf->data, leafsize, blocks[3]); |
| |
| /* create the device tree */ |
| nritems = 0; |
| itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - |
| 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(buf, nritems), itemoff); |
| btrfs_set_item_size(buf, btrfs_item_nr(buf, 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, blocks[4]); |
| btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID); |
| btrfs_set_header_nritems(buf, nritems); |
| csum_tree_block(NULL, buf, 0); |
| ret = pwrite(fd, buf->data, leafsize, blocks[4]); |
| |
| /* finally create the FS root */ |
| btrfs_set_header_bytenr(buf, blocks[5]); |
| btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID); |
| btrfs_set_header_nritems(buf, 0); |
| csum_tree_block(NULL, buf, 0); |
| ret = pwrite(fd, buf->data, leafsize, blocks[5]); |
| BUG_ON(ret != leafsize); |
| |
| /* and write out the super block */ |
| BUG_ON(sizeof(super) > sectorsize); |
| memset(buf->data, 0, sectorsize); |
| memcpy(buf->data, &super, sizeof(super)); |
| buf->len = sectorsize; |
| csum_tree_block(NULL, buf, 0); |
| ret = pwrite(fd, buf->data, sectorsize, blocks[0]); |
| BUG_ON(ret != sectorsize); |
| |
| |
| free(buf); |
| return 0; |
| } |
| |
| static u64 device_size(int fd, struct stat *st) |
| { |
| u64 size; |
| if (S_ISREG(st->st_mode)) { |
| return st->st_size; |
| } |
| if (!S_ISBLK(st->st_mode)) { |
| return 0; |
| } |
| if (ioctl(fd, BLKGETSIZE64, &size) >= 0) { |
| return size; |
| } |
| return 0; |
| } |
| |
| static int zero_blocks(int fd, off_t start, size_t len) |
| { |
| char *buf = malloc(len); |
| int ret = 0; |
| ssize_t written; |
| |
| if (!buf) |
| return -ENOMEM; |
| memset(buf, 0, len); |
| written = pwrite(fd, buf, len, start); |
| if (written != len) |
| ret = -EIO; |
| free(buf); |
| return ret; |
| } |
| |
| static int zero_dev_start(int fd) |
| { |
| off_t start = 0; |
| size_t len = 2 * 1024 * 1024; |
| |
| #ifdef __sparc__ |
| /* don't overwrite the disk labels on sparc */ |
| start = 1024; |
| len -= 1024; |
| #endif |
| return zero_blocks(fd, start, len); |
| } |
| |
| static int zero_dev_end(int fd, u64 dev_size) |
| { |
| size_t len = 2 * 1024 * 1024; |
| off_t start = dev_size - len; |
| |
| return zero_blocks(fd, start, len); |
| } |
| |
| int btrfs_add_to_fsid(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, int fd, char *path, |
| u64 block_count, u32 io_width, u32 io_align, |
| u32 sectorsize) |
| { |
| struct btrfs_super_block *disk_super; |
| struct btrfs_super_block *super = &root->fs_info->super_copy; |
| struct btrfs_device *device; |
| struct btrfs_dev_item *dev_item; |
| char *buf; |
| u64 total_bytes; |
| u64 num_devs; |
| int ret; |
| |
| device = kmalloc(sizeof(*device), GFP_NOFS); |
| if (!device) |
| return -ENOMEM; |
| buf = kmalloc(sectorsize, GFP_NOFS); |
| if (!buf) { |
| kfree(device); |
| return -ENOMEM; |
| } |
| BUG_ON(sizeof(*disk_super) > sectorsize); |
| memset(buf, 0, sectorsize); |
| |
| disk_super = (struct btrfs_super_block *)buf; |
| dev_item = &disk_super->dev_item; |
| |
| uuid_generate(device->uuid); |
| device->devid = 0; |
| device->type = 0; |
| device->io_width = io_width; |
| device->io_align = io_align; |
| device->sector_size = sectorsize; |
| device->fd = fd; |
| device->total_bytes = block_count; |
| device->bytes_used = 0; |
| device->total_ios = 0; |
| device->dev_root = root->fs_info->dev_root; |
| |
| ret = btrfs_add_device(trans, root, device); |
| BUG_ON(ret); |
| |
| total_bytes = btrfs_super_total_bytes(super) + block_count; |
| btrfs_set_super_total_bytes(super, total_bytes); |
| |
| num_devs = btrfs_super_num_devices(super) + 1; |
| btrfs_set_super_num_devices(super, num_devs); |
| |
| memcpy(disk_super, super, sizeof(*disk_super)); |
| |
| printf("adding device %s id %llu\n", path, |
| (unsigned long long)device->devid); |
| |
| btrfs_set_stack_device_id(dev_item, device->devid); |
| btrfs_set_stack_device_type(dev_item, device->type); |
| btrfs_set_stack_device_io_align(dev_item, device->io_align); |
| btrfs_set_stack_device_io_width(dev_item, device->io_width); |
| btrfs_set_stack_device_sector_size(dev_item, device->sector_size); |
| btrfs_set_stack_device_total_bytes(dev_item, device->total_bytes); |
| btrfs_set_stack_device_bytes_used(dev_item, device->bytes_used); |
| memcpy(&dev_item->uuid, device->uuid, BTRFS_UUID_SIZE); |
| |
| ret = pwrite(fd, buf, sectorsize, BTRFS_SUPER_INFO_OFFSET); |
| BUG_ON(ret != sectorsize); |
| |
| kfree(buf); |
| list_add(&device->dev_list, &root->fs_info->fs_devices->devices); |
| ret = btrfs_bootstrap_super_map(&root->fs_info->mapping_tree, |
| root->fs_info->fs_devices); |
| BUG_ON(ret); |
| return 0; |
| } |
| |
| int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret) |
| { |
| u64 block_count; |
| struct stat st; |
| int ret; |
| |
| ret = fstat(fd, &st); |
| if (ret < 0) { |
| fprintf(stderr, "unable to stat %s\n", file); |
| exit(1); |
| } |
| |
| block_count = device_size(fd, &st); |
| if (block_count == 0) { |
| fprintf(stderr, "unable to find %s size\n", file); |
| exit(1); |
| } |
| zero_end = 1; |
| |
| if (block_count < 256 * 1024 * 1024) { |
| fprintf(stderr, "device %s is too small\n", file); |
| exit(1); |
| } |
| ret = zero_dev_start(fd); |
| if (ret) { |
| fprintf(stderr, "failed to zero device start %d\n", ret); |
| exit(1); |
| } |
| |
| if (zero_end) { |
| ret = zero_dev_end(fd, block_count); |
| if (ret) { |
| fprintf(stderr, "failed to zero device end %d\n", ret); |
| exit(1); |
| } |
| } |
| *block_count_ret = block_count; |
| return 0; |
| } |
| |
| int btrfs_make_root_dir(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root, u64 objectid) |
| { |
| int ret; |
| struct btrfs_inode_item inode_item; |
| |
| memset(&inode_item, 0, sizeof(inode_item)); |
| btrfs_set_stack_inode_generation(&inode_item, trans->transid); |
| btrfs_set_stack_inode_size(&inode_item, 0); |
| btrfs_set_stack_inode_nlink(&inode_item, 1); |
| btrfs_set_stack_inode_nblocks(&inode_item, 1); |
| btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0555); |
| |
| if (root->fs_info->tree_root == root) |
| btrfs_set_super_root_dir(&root->fs_info->super_copy, objectid); |
| |
| ret = btrfs_insert_inode(trans, root, objectid, &inode_item); |
| if (ret) |
| goto error; |
| |
| ret = btrfs_insert_inode_ref(trans, root, "..", 2, objectid, objectid, 0); |
| if (ret) |
| goto error; |
| |
| btrfs_set_root_dirid(&root->root_item, objectid); |
| ret = 0; |
| error: |
| return ret; |
| } |
| |
| /* |
| * returns 1 if the device was mounted, < 0 on error or 0 if everything |
| * is safe to continue. TODO, this should also scan multi-device filesystems |
| */ |
| int check_mounted(char *file) |
| { |
| struct mntent *mnt; |
| struct stat st_buf; |
| dev_t file_dev = 0; |
| dev_t file_rdev = 0; |
| ino_t file_ino = 0; |
| FILE *f; |
| int ret = 0; |
| |
| if ((f = setmntent ("/proc/mounts", "r")) == NULL) |
| return -errno; |
| |
| if (stat(file, &st_buf) < 0) { |
| return -errno; |
| } else { |
| if (S_ISBLK(st_buf.st_mode)) { |
| file_rdev = st_buf.st_rdev; |
| } else { |
| file_dev = st_buf.st_dev; |
| file_ino = st_buf.st_ino; |
| } |
| } |
| |
| while ((mnt = getmntent (f)) != NULL) { |
| if (strcmp(file, mnt->mnt_fsname) == 0) |
| break; |
| |
| if (stat(mnt->mnt_fsname, &st_buf) == 0) { |
| if (S_ISBLK(st_buf.st_mode)) { |
| if (file_rdev && (file_rdev == st_buf.st_rdev)) |
| break; |
| } else if (file_dev && ((file_dev == st_buf.st_dev) && |
| (file_ino == st_buf.st_ino))) { |
| break; |
| } |
| } |
| } |
| |
| if (mnt) { |
| /* found an entry in mnt table */ |
| ret = 1; |
| } |
| |
| endmntent (f); |
| return ret; |
| } |
| |
| struct pending_dir { |
| struct list_head list; |
| char name[256]; |
| }; |
| |
| int btrfs_register_one_device(char *fname) |
| { |
| struct btrfs_ioctl_vol_args args; |
| int fd; |
| int ret; |
| |
| fd = open("/dev/btrfs-control", O_RDONLY); |
| if (fd < 0) |
| return -EINVAL; |
| strcpy(args.name, fname); |
| ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args); |
| close(fd); |
| return ret; |
| } |
| |
| int btrfs_scan_one_dir(char *dirname, int run_ioctl) |
| { |
| DIR *dirp = NULL; |
| struct dirent *dirent; |
| struct pending_dir *pending; |
| struct stat st; |
| int ret; |
| int fd; |
| int dirname_len; |
| int pathlen; |
| char *fullpath; |
| struct list_head pending_list; |
| struct btrfs_fs_devices *tmp_devices; |
| u64 num_devices; |
| |
| INIT_LIST_HEAD(&pending_list); |
| |
| pending = malloc(sizeof(*pending)); |
| if (!pending) |
| return -ENOMEM; |
| strcpy(pending->name, dirname); |
| |
| again: |
| dirname_len = strlen(pending->name); |
| pathlen = 1024; |
| fullpath = malloc(pathlen); |
| dirname = pending->name; |
| |
| if (!fullpath) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| dirp = opendir(dirname); |
| if (!dirp) { |
| fprintf(stderr, "Unable to open /sys/block for scanning\n"); |
| return -ENOENT; |
| } |
| while(1) { |
| dirent = readdir(dirp); |
| if (!dirent) |
| break; |
| if (dirent->d_name[0] == '.') |
| continue; |
| if (dirname_len + strlen(dirent->d_name) + 2 > pathlen) { |
| ret = -EFAULT; |
| goto fail; |
| } |
| snprintf(fullpath, pathlen, "%s/%s", dirname, dirent->d_name); |
| ret = lstat(fullpath, &st); |
| if (ret < 0) { |
| fprintf(stderr, "failed to stat %s\n", fullpath); |
| continue; |
| } |
| if (S_ISLNK(st.st_mode)) |
| continue; |
| if (S_ISDIR(st.st_mode)) { |
| struct pending_dir *next = malloc(sizeof(*next)); |
| if (!next) { |
| ret = -ENOMEM; |
| goto fail; |
| } |
| strcpy(next->name, fullpath); |
| list_add_tail(&next->list, &pending_list); |
| } |
| if (!S_ISBLK(st.st_mode)) { |
| continue; |
| } |
| fd = open(fullpath, O_RDONLY); |
| if (fd < 0) { |
| fprintf(stderr, "failed to read %s\n", fullpath); |
| continue; |
| } |
| ret = btrfs_scan_one_device(fd, fullpath, &tmp_devices, |
| &num_devices, |
| BTRFS_SUPER_INFO_OFFSET); |
| if (ret == 0 && run_ioctl > 0) { |
| btrfs_register_one_device(fullpath); |
| } |
| close(fd); |
| } |
| if (!list_empty(&pending_list)) { |
| free(pending); |
| pending = list_entry(pending_list.next, struct pending_dir, |
| list); |
| list_del(&pending->list); |
| closedir(dirp); |
| goto again; |
| } |
| ret = 0; |
| fail: |
| free(pending); |
| if (dirp) |
| closedir(dirp); |
| return ret; |
| } |
| |
| int btrfs_scan_for_fsid(struct btrfs_fs_devices *fs_devices, u64 total_devs, |
| int run_ioctls) |
| { |
| return btrfs_scan_one_dir("/dev", run_ioctls); |
| } |
| |
| int btrfs_device_already_in_root(struct btrfs_root *root, int fd, |
| int super_offset) |
| { |
| struct btrfs_super_block *disk_super; |
| char *buf; |
| int ret = 0; |
| |
| buf = malloc(BTRFS_SUPER_INFO_SIZE); |
| if (!buf) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| ret = pread(fd, buf, BTRFS_SUPER_INFO_SIZE, super_offset); |
| if (ret != BTRFS_SUPER_INFO_SIZE) |
| goto brelse; |
| |
| ret = 0; |
| disk_super = (struct btrfs_super_block *)buf; |
| if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
| sizeof(disk_super->magic))) |
| goto brelse; |
| |
| if (!memcmp(disk_super->fsid, root->fs_info->super_copy.fsid, |
| BTRFS_FSID_SIZE)) |
| ret = 1; |
| brelse: |
| free(buf); |
| out: |
| return ret; |
| } |
| |
| static char *size_strs[] = { "", "KB", "MB", "GB", "TB", |
| "PB", "EB", "ZB", "YB"}; |
| char *pretty_sizes(u64 size) |
| { |
| int num_divs = 0; |
| u64 last_size = size; |
| u64 fract_size = size; |
| float fraction; |
| char *pretty; |
| |
| while(size > 0) { |
| fract_size = last_size; |
| last_size = size; |
| size /= 1024; |
| num_divs++; |
| } |
| if (num_divs == 0) |
| num_divs = 1; |
| if (num_divs > ARRAY_SIZE(size_strs)) |
| return NULL; |
| |
| fraction = (float)fract_size / 1024; |
| pretty = malloc(16); |
| sprintf(pretty, "%.2f%s", fraction, size_strs[num_divs-1]); |
| return pretty; |
| } |
| |