mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-24 23:22:27 +00:00
8935d84361
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
1227 lines
32 KiB
C
1227 lines
32 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#define _XOPEN_SOURCE 600
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#define __USE_XOPEN2K
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef __CHECKER__
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <uuid/uuid.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <mntent.h>
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#include <linux/loop.h>
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#include <linux/major.h>
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#include <linux/kdev_t.h>
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#include <limits.h>
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#include "kerncompat.h"
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#include "radix-tree.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "crc32c.h"
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#include "utils.h"
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#include "volumes.h"
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#include "ioctl.h"
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#ifdef __CHECKER__
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#define BLKGETSIZE64 0
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static inline int ioctl(int fd, int define, u64 *size) { return 0; }
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#endif
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#ifndef BLKDISCARD
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#define BLKDISCARD _IO(0x12,119)
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#endif
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static int
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discard_blocks(int fd, u64 start, u64 len)
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{
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u64 range[2] = { start, len };
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if (ioctl(fd, BLKDISCARD, &range) < 0)
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return errno;
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return 0;
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}
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static u64 reference_root_table[] = {
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[1] = BTRFS_ROOT_TREE_OBJECTID,
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[2] = BTRFS_EXTENT_TREE_OBJECTID,
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[3] = BTRFS_CHUNK_TREE_OBJECTID,
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[4] = BTRFS_DEV_TREE_OBJECTID,
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[5] = BTRFS_FS_TREE_OBJECTID,
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[6] = BTRFS_CSUM_TREE_OBJECTID,
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};
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int make_btrfs(int fd, const char *device, const char *label,
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u64 blocks[7], u64 num_bytes, u32 nodesize,
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u32 leafsize, u32 sectorsize, u32 stripesize)
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{
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struct btrfs_super_block super;
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struct extent_buffer *buf;
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struct btrfs_root_item root_item;
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struct btrfs_disk_key disk_key;
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struct btrfs_extent_item *extent_item;
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struct btrfs_inode_item *inode_item;
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struct btrfs_chunk *chunk;
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struct btrfs_dev_item *dev_item;
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struct btrfs_dev_extent *dev_extent;
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u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
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u8 *ptr;
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int i;
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int ret;
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u32 itemoff;
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u32 nritems = 0;
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u64 first_free;
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u64 ref_root;
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u32 array_size;
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u32 item_size;
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first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
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first_free &= ~((u64)sectorsize - 1);
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memset(&super, 0, sizeof(super));
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num_bytes = (num_bytes / sectorsize) * sectorsize;
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uuid_generate(super.fsid);
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uuid_generate(super.dev_item.uuid);
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uuid_generate(chunk_tree_uuid);
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btrfs_set_super_bytenr(&super, blocks[0]);
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btrfs_set_super_num_devices(&super, 1);
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strncpy((char *)&super.magic, BTRFS_MAGIC, sizeof(super.magic));
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btrfs_set_super_generation(&super, 1);
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btrfs_set_super_root(&super, blocks[1]);
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btrfs_set_super_chunk_root(&super, blocks[3]);
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btrfs_set_super_total_bytes(&super, num_bytes);
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btrfs_set_super_bytes_used(&super, 6 * leafsize);
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btrfs_set_super_sectorsize(&super, sectorsize);
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btrfs_set_super_leafsize(&super, leafsize);
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btrfs_set_super_nodesize(&super, nodesize);
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btrfs_set_super_stripesize(&super, stripesize);
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btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
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btrfs_set_super_chunk_root_generation(&super, 1);
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btrfs_set_super_cache_generation(&super, -1);
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if (label)
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strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
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buf = malloc(sizeof(*buf) + max(sectorsize, leafsize));
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/* create the tree of root objects */
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memset(buf->data, 0, leafsize);
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buf->len = leafsize;
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btrfs_set_header_bytenr(buf, blocks[1]);
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btrfs_set_header_nritems(buf, 4);
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btrfs_set_header_generation(buf, 1);
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btrfs_set_header_backref_rev(buf, BTRFS_MIXED_BACKREF_REV);
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btrfs_set_header_owner(buf, BTRFS_ROOT_TREE_OBJECTID);
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write_extent_buffer(buf, super.fsid, (unsigned long)
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btrfs_header_fsid(buf), BTRFS_FSID_SIZE);
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write_extent_buffer(buf, chunk_tree_uuid, (unsigned long)
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btrfs_header_chunk_tree_uuid(buf),
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BTRFS_UUID_SIZE);
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/* create the items for the root tree */
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memset(&root_item, 0, sizeof(root_item));
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inode_item = &root_item.inode;
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btrfs_set_stack_inode_generation(inode_item, 1);
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btrfs_set_stack_inode_size(inode_item, 3);
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btrfs_set_stack_inode_nlink(inode_item, 1);
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btrfs_set_stack_inode_nbytes(inode_item, leafsize);
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btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
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btrfs_set_root_refs(&root_item, 1);
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btrfs_set_root_used(&root_item, leafsize);
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btrfs_set_root_generation(&root_item, 1);
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memset(&disk_key, 0, sizeof(disk_key));
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btrfs_set_disk_key_type(&disk_key, BTRFS_ROOT_ITEM_KEY);
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btrfs_set_disk_key_offset(&disk_key, 0);
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nritems = 0;
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itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[2]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_EXTENT_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item, btrfs_item_ptr_offset(buf,
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nritems), sizeof(root_item));
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nritems++;
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itemoff = itemoff - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[4]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item,
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btrfs_item_ptr_offset(buf, nritems),
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sizeof(root_item));
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nritems++;
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itemoff = itemoff - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[5]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_FS_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item,
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btrfs_item_ptr_offset(buf, nritems),
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sizeof(root_item));
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nritems++;
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itemoff = itemoff - sizeof(root_item);
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btrfs_set_root_bytenr(&root_item, blocks[6]);
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btrfs_set_disk_key_objectid(&disk_key, BTRFS_CSUM_TREE_OBJECTID);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
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sizeof(root_item));
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write_extent_buffer(buf, &root_item,
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btrfs_item_ptr_offset(buf, nritems),
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sizeof(root_item));
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nritems++;
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csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
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ret = pwrite(fd, buf->data, leafsize, blocks[1]);
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BUG_ON(ret != leafsize);
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/* create the items for the extent tree */
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memset(buf->data+sizeof(struct btrfs_header), 0,
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leafsize-sizeof(struct btrfs_header));
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nritems = 0;
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itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
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for (i = 1; i < 7; i++) {
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BUG_ON(blocks[i] < first_free);
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BUG_ON(blocks[i] < blocks[i - 1]);
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/* create extent item */
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itemoff -= sizeof(struct btrfs_extent_item) +
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sizeof(struct btrfs_tree_block_info);
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btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
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btrfs_set_disk_key_offset(&disk_key, leafsize);
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btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
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itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
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sizeof(struct btrfs_extent_item) +
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sizeof(struct btrfs_tree_block_info));
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extent_item = btrfs_item_ptr(buf, nritems,
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struct btrfs_extent_item);
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btrfs_set_extent_refs(buf, extent_item, 1);
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btrfs_set_extent_generation(buf, extent_item, 1);
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btrfs_set_extent_flags(buf, extent_item,
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BTRFS_EXTENT_FLAG_TREE_BLOCK);
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nritems++;
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/* create extent ref */
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ref_root = reference_root_table[i];
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btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
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btrfs_set_disk_key_offset(&disk_key, ref_root);
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btrfs_set_disk_key_type(&disk_key, BTRFS_TREE_BLOCK_REF_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
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itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), 0);
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nritems++;
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}
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btrfs_set_header_bytenr(buf, blocks[2]);
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btrfs_set_header_owner(buf, BTRFS_EXTENT_TREE_OBJECTID);
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btrfs_set_header_nritems(buf, nritems);
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csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
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ret = pwrite(fd, buf->data, leafsize, blocks[2]);
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BUG_ON(ret != leafsize);
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/* create the chunk tree */
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memset(buf->data+sizeof(struct btrfs_header), 0,
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leafsize-sizeof(struct btrfs_header));
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nritems = 0;
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item_size = sizeof(*dev_item);
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itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) - item_size;
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/* first device 1 (there is no device 0) */
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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_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
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dev_item = btrfs_item_ptr(buf, nritems, struct btrfs_dev_item);
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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, num_bytes);
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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_set_device_io_align(buf, dev_item, sectorsize);
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btrfs_set_device_io_width(buf, dev_item, sectorsize);
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btrfs_set_device_sector_size(buf, dev_item, sectorsize);
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btrfs_set_device_type(buf, dev_item, 0);
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write_extent_buffer(buf, super.dev_item.uuid,
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(unsigned long)btrfs_device_uuid(dev_item),
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BTRFS_UUID_SIZE);
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write_extent_buffer(buf, super.fsid,
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(unsigned long)btrfs_device_fsid(dev_item),
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BTRFS_UUID_SIZE);
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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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nritems++;
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item_size = btrfs_chunk_item_size(1);
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itemoff = itemoff - item_size;
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/* then we have chunk 0 */
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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, 0);
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btrfs_set_disk_key_type(&disk_key, BTRFS_CHUNK_ITEM_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems), item_size);
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chunk = btrfs_item_ptr(buf, nritems, struct btrfs_chunk);
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btrfs_set_chunk_length(buf, chunk, BTRFS_MKFS_SYSTEM_GROUP_SIZE);
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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, BTRFS_BLOCK_GROUP_SYSTEM);
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btrfs_set_chunk_io_align(buf, chunk, sectorsize);
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btrfs_set_chunk_io_width(buf, chunk, sectorsize);
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btrfs_set_chunk_sector_size(buf, chunk, sectorsize);
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btrfs_set_chunk_num_stripes(buf, chunk, 1);
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btrfs_set_stripe_devid_nr(buf, chunk, 0, 1);
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btrfs_set_stripe_offset_nr(buf, chunk, 0, 0);
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nritems++;
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write_extent_buffer(buf, super.dev_item.uuid,
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(unsigned long)btrfs_stripe_dev_uuid(&chunk->stripe),
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BTRFS_UUID_SIZE);
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/* copy the key for the chunk to the system array */
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ptr = super.sys_chunk_array;
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array_size = sizeof(disk_key);
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memcpy(ptr, &disk_key, sizeof(disk_key));
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ptr += sizeof(disk_key);
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/* copy the chunk to the system array */
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read_extent_buffer(buf, ptr, (unsigned long)chunk, item_size);
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array_size += item_size;
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ptr += item_size;
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btrfs_set_super_sys_array_size(&super, array_size);
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btrfs_set_header_bytenr(buf, blocks[3]);
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btrfs_set_header_owner(buf, BTRFS_CHUNK_TREE_OBJECTID);
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btrfs_set_header_nritems(buf, nritems);
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csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
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ret = pwrite(fd, buf->data, leafsize, blocks[3]);
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/* create the device tree */
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memset(buf->data+sizeof(struct btrfs_header), 0,
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leafsize-sizeof(struct btrfs_header));
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nritems = 0;
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itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize) -
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sizeof(struct btrfs_dev_extent);
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btrfs_set_disk_key_objectid(&disk_key, 1);
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btrfs_set_disk_key_offset(&disk_key, 0);
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btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_EXTENT_KEY);
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btrfs_set_item_key(buf, &disk_key, nritems);
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btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems), itemoff);
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btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
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sizeof(struct btrfs_dev_extent));
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dev_extent = btrfs_item_ptr(buf, nritems, struct btrfs_dev_extent);
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btrfs_set_dev_extent_chunk_tree(buf, dev_extent,
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BTRFS_CHUNK_TREE_OBJECTID);
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btrfs_set_dev_extent_chunk_objectid(buf, dev_extent,
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BTRFS_FIRST_CHUNK_TREE_OBJECTID);
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btrfs_set_dev_extent_chunk_offset(buf, dev_extent, 0);
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write_extent_buffer(buf, chunk_tree_uuid,
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(unsigned long)btrfs_dev_extent_chunk_tree_uuid(dev_extent),
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BTRFS_UUID_SIZE);
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btrfs_set_dev_extent_length(buf, dev_extent,
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BTRFS_MKFS_SYSTEM_GROUP_SIZE);
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nritems++;
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btrfs_set_header_bytenr(buf, blocks[4]);
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btrfs_set_header_owner(buf, BTRFS_DEV_TREE_OBJECTID);
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btrfs_set_header_nritems(buf, nritems);
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csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
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ret = pwrite(fd, buf->data, leafsize, blocks[4]);
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/* create the FS root */
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memset(buf->data+sizeof(struct btrfs_header), 0,
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leafsize-sizeof(struct btrfs_header));
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btrfs_set_header_bytenr(buf, blocks[5]);
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btrfs_set_header_owner(buf, BTRFS_FS_TREE_OBJECTID);
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btrfs_set_header_nritems(buf, 0);
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csum_tree_block_size(buf, BTRFS_CRC32_SIZE, 0);
|
|
ret = pwrite(fd, buf->data, leafsize, blocks[5]);
|
|
BUG_ON(ret != leafsize);
|
|
|
|
/* finally create the csum root */
|
|
memset(buf->data+sizeof(struct btrfs_header), 0,
|
|
leafsize-sizeof(struct btrfs_header));
|
|
btrfs_set_header_bytenr(buf, 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, leafsize, blocks[6]);
|
|
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_size(buf, BTRFS_CRC32_SIZE, 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->writeable = 1;
|
|
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_super_bytenr(disk_super, BTRFS_SUPER_INFO_OFFSET);
|
|
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);
|
|
device->fs_devices = root->fs_info->fs_devices;
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
|
|
int *mixed)
|
|
{
|
|
/* discard by default when called from 'device add' */
|
|
return __btrfs_prepare_device(fd, file, zero_end, block_count_ret, mixed, 0);
|
|
}
|
|
int __btrfs_prepare_device(int fd, char *file, int zero_end, u64 *block_count_ret,
|
|
int *mixed, int nodiscard)
|
|
{
|
|
u64 block_count;
|
|
u64 bytenr;
|
|
struct stat st;
|
|
int i, 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);
|
|
}
|
|
if (*block_count_ret)
|
|
block_count = min(block_count, *block_count_ret);
|
|
zero_end = 1;
|
|
|
|
if (block_count < 1024 * 1024 * 1024 && !(*mixed)) {
|
|
printf("SMALL VOLUME: forcing mixed metadata/data groups\n");
|
|
*mixed = 1;
|
|
}
|
|
|
|
if (!nodiscard) {
|
|
/*
|
|
* We intentionally ignore errors from the discard ioctl. It is
|
|
* not necessary for the mkfs functionality but just an optimization.
|
|
*/
|
|
discard_blocks(fd, 0, block_count);
|
|
}
|
|
|
|
ret = zero_dev_start(fd);
|
|
if (ret) {
|
|
fprintf(stderr, "failed to zero device start %d\n", ret);
|
|
exit(1);
|
|
}
|
|
|
|
for (i = 0 ; i < BTRFS_SUPER_MIRROR_MAX; i++) {
|
|
bytenr = btrfs_sb_offset(i);
|
|
if (bytenr >= block_count)
|
|
break;
|
|
zero_blocks(fd, bytenr, BTRFS_SUPER_INFO_SIZE);
|
|
}
|
|
|
|
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;
|
|
time_t now = time(NULL);
|
|
|
|
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_nbytes(&inode_item, root->leafsize);
|
|
btrfs_set_stack_inode_mode(&inode_item, S_IFDIR | 0555);
|
|
btrfs_set_stack_timespec_sec(&inode_item.atime, now);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.atime, 0);
|
|
btrfs_set_stack_timespec_sec(&inode_item.ctime, now);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.ctime, 0);
|
|
btrfs_set_stack_timespec_sec(&inode_item.mtime, now);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.mtime, 0);
|
|
btrfs_set_stack_timespec_sec(&inode_item.otime, 0);
|
|
btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
|
|
|
|
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;
|
|
}
|
|
|
|
/* checks if a device is a loop device */
|
|
int is_loop_device (const char* device) {
|
|
struct stat statbuf;
|
|
|
|
if(stat(device, &statbuf) < 0)
|
|
return -errno;
|
|
|
|
return (S_ISBLK(statbuf.st_mode) &&
|
|
MAJOR(statbuf.st_rdev) == LOOP_MAJOR);
|
|
}
|
|
|
|
|
|
/* Takes a loop device path (e.g. /dev/loop0) and returns
|
|
* the associated file (e.g. /images/my_btrfs.img) */
|
|
int resolve_loop_device(const char* loop_dev, char* loop_file, int max_len)
|
|
{
|
|
int loop_fd;
|
|
int ret_ioctl;
|
|
struct loop_info loopinfo;
|
|
|
|
if ((loop_fd = open(loop_dev, O_RDONLY)) < 0)
|
|
return -errno;
|
|
|
|
ret_ioctl = ioctl(loop_fd, LOOP_GET_STATUS, &loopinfo);
|
|
close(loop_fd);
|
|
|
|
if (ret_ioctl == 0) {
|
|
strncpy(loop_file, loopinfo.lo_name, max_len);
|
|
if (max_len > 0)
|
|
loop_file[max_len-1] = 0;
|
|
} else
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Checks whether a and b are identical or device
|
|
* files associated with the same block device
|
|
*/
|
|
int is_same_blk_file(const char* a, const char* b)
|
|
{
|
|
struct stat st_buf_a, st_buf_b;
|
|
char real_a[PATH_MAX];
|
|
char real_b[PATH_MAX];
|
|
|
|
if(!realpath(a, real_a) ||
|
|
!realpath(b, real_b))
|
|
{
|
|
return -errno;
|
|
}
|
|
|
|
/* Identical path? */
|
|
if(strcmp(real_a, real_b) == 0)
|
|
return 1;
|
|
|
|
if(stat(a, &st_buf_a) < 0 ||
|
|
stat(b, &st_buf_b) < 0)
|
|
{
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
return -errno;
|
|
}
|
|
|
|
/* Same blockdevice? */
|
|
if(S_ISBLK(st_buf_a.st_mode) &&
|
|
S_ISBLK(st_buf_b.st_mode) &&
|
|
st_buf_a.st_rdev == st_buf_b.st_rdev)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/* Hardlink? */
|
|
if (st_buf_a.st_dev == st_buf_b.st_dev &&
|
|
st_buf_a.st_ino == st_buf_b.st_ino)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* checks if a and b are identical or device
|
|
* files associated with the same block device or
|
|
* if one file is a loop device that uses the other
|
|
* file.
|
|
*/
|
|
int is_same_loop_file(const char* a, const char* b)
|
|
{
|
|
char res_a[PATH_MAX];
|
|
char res_b[PATH_MAX];
|
|
const char* final_a;
|
|
const char* final_b;
|
|
int ret;
|
|
|
|
/* Resolve a if it is a loop device */
|
|
if((ret = is_loop_device(a)) < 0) {
|
|
if (ret == -ENOENT)
|
|
return 0;
|
|
return ret;
|
|
} else if (ret) {
|
|
if ((ret = resolve_loop_device(a, res_a, sizeof(res_a))) < 0)
|
|
return ret;
|
|
|
|
final_a = res_a;
|
|
} else {
|
|
final_a = a;
|
|
}
|
|
|
|
/* Resolve b if it is a loop device */
|
|
if ((ret = is_loop_device(b)) < 0) {
|
|
if (ret == -ENOENT)
|
|
return 0;
|
|
return ret;
|
|
} else if (ret) {
|
|
if((ret = resolve_loop_device(b, res_b, sizeof(res_b))) < 0)
|
|
return ret;
|
|
|
|
final_b = res_b;
|
|
} else {
|
|
final_b = b;
|
|
}
|
|
|
|
return is_same_blk_file(final_a, final_b);
|
|
}
|
|
|
|
/* Checks if a file exists and is a block or regular file*/
|
|
int is_existing_blk_or_reg_file(const char* filename)
|
|
{
|
|
struct stat st_buf;
|
|
|
|
if(stat(filename, &st_buf) < 0) {
|
|
if(errno == ENOENT)
|
|
return 0;
|
|
else
|
|
return -errno;
|
|
}
|
|
|
|
return (S_ISBLK(st_buf.st_mode) || S_ISREG(st_buf.st_mode));
|
|
}
|
|
|
|
/* Checks if a file is used (directly or indirectly via a loop device)
|
|
* by a device in fs_devices
|
|
*/
|
|
int blk_file_in_dev_list(struct btrfs_fs_devices* fs_devices, const char* file)
|
|
{
|
|
int ret;
|
|
struct list_head *head;
|
|
struct list_head *cur;
|
|
struct btrfs_device *device;
|
|
|
|
head = &fs_devices->devices;
|
|
list_for_each(cur, head) {
|
|
device = list_entry(cur, struct btrfs_device, dev_list);
|
|
|
|
if((ret = is_same_loop_file(device->name, file)))
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* returns 1 if the device was mounted, < 0 on error or 0 if everything
|
|
* is safe to continue.
|
|
*/
|
|
int check_mounted(const char* file)
|
|
{
|
|
int fd;
|
|
int ret;
|
|
|
|
fd = open(file, O_RDONLY);
|
|
if (fd < 0) {
|
|
fprintf (stderr, "check_mounted(): Could not open %s\n", file);
|
|
return -errno;
|
|
}
|
|
|
|
ret = check_mounted_where(fd, file, NULL, 0, NULL);
|
|
close(fd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int check_mounted_where(int fd, const char *file, char *where, int size,
|
|
struct btrfs_fs_devices **fs_dev_ret)
|
|
{
|
|
int ret;
|
|
u64 total_devs = 1;
|
|
int is_btrfs;
|
|
struct btrfs_fs_devices *fs_devices_mnt = NULL;
|
|
FILE *f;
|
|
struct mntent *mnt;
|
|
|
|
/* scan the initial device */
|
|
ret = btrfs_scan_one_device(fd, file, &fs_devices_mnt,
|
|
&total_devs, BTRFS_SUPER_INFO_OFFSET);
|
|
is_btrfs = (ret >= 0);
|
|
|
|
/* scan other devices */
|
|
if (is_btrfs && total_devs > 1) {
|
|
if((ret = btrfs_scan_for_fsid(fs_devices_mnt, total_devs, 1)))
|
|
return ret;
|
|
}
|
|
|
|
/* iterate over the list of currently mountes filesystems */
|
|
if ((f = setmntent ("/proc/mounts", "r")) == NULL)
|
|
return -errno;
|
|
|
|
while ((mnt = getmntent (f)) != NULL) {
|
|
if(is_btrfs) {
|
|
if(strcmp(mnt->mnt_type, "btrfs") != 0)
|
|
continue;
|
|
|
|
ret = blk_file_in_dev_list(fs_devices_mnt, mnt->mnt_fsname);
|
|
} else {
|
|
/* ignore entries in the mount table that are not
|
|
associated with a file*/
|
|
if((ret = is_existing_blk_or_reg_file(mnt->mnt_fsname)) < 0)
|
|
goto out_mntloop_err;
|
|
else if(!ret)
|
|
continue;
|
|
|
|
ret = is_same_loop_file(file, mnt->mnt_fsname);
|
|
}
|
|
|
|
if(ret < 0)
|
|
goto out_mntloop_err;
|
|
else if(ret)
|
|
break;
|
|
}
|
|
|
|
/* Did we find an entry in mnt table? */
|
|
if (mnt && size && where) {
|
|
strncpy(where, mnt->mnt_dir, size);
|
|
where[size-1] = 0;
|
|
}
|
|
if (fs_dev_ret)
|
|
*fs_dev_ret = fs_devices_mnt;
|
|
|
|
ret = (mnt != NULL);
|
|
|
|
out_mntloop_err:
|
|
endmntent (f);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Gets the mount point of btrfs filesystem that is using the specified device.
|
|
* Returns 0 is everything is good, <0 if we have an error.
|
|
* TODO: Fix this fucntion and check_mounted to work with multiple drive BTRFS
|
|
* setups.
|
|
*/
|
|
int get_mountpt(char *dev, char *mntpt, size_t size)
|
|
{
|
|
struct mntent *mnt;
|
|
FILE *f;
|
|
int ret = 0;
|
|
|
|
f = setmntent("/proc/mounts", "r");
|
|
if (f == NULL)
|
|
return -errno;
|
|
|
|
while ((mnt = getmntent(f)) != NULL )
|
|
{
|
|
if (strcmp(dev, mnt->mnt_fsname) == 0)
|
|
{
|
|
strncpy(mntpt, mnt->mnt_dir, size);
|
|
if (size)
|
|
mntpt[size-1] = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (mnt == NULL)
|
|
{
|
|
/* We didn't find an entry so lets report an error */
|
|
ret = -1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct pending_dir {
|
|
struct list_head list;
|
|
char name[256];
|
|
};
|
|
|
|
void btrfs_register_one_device(char *fname)
|
|
{
|
|
struct btrfs_ioctl_vol_args args;
|
|
int fd;
|
|
int ret;
|
|
int e;
|
|
|
|
fd = open("/dev/btrfs-control", O_RDONLY);
|
|
if (fd < 0) {
|
|
fprintf(stderr, "failed to open /dev/btrfs-control "
|
|
"skipping device registration\n");
|
|
return;
|
|
}
|
|
strncpy(args.name, fname, BTRFS_PATH_NAME_MAX);
|
|
args.name[BTRFS_PATH_NAME_MAX-1] = 0;
|
|
ret = ioctl(fd, BTRFS_IOC_SCAN_DEV, &args);
|
|
e = errno;
|
|
if(ret<0){
|
|
fprintf(stderr, "ERROR: unable to scan the device '%s' - %s\n",
|
|
fname, strerror(e));
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
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 %s for scanning\n", dirname);
|
|
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: %s\n", fullpath,
|
|
strerror(errno));
|
|
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);
|
|
dirp = NULL;
|
|
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)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_scan_block_devices(run_ioctls);
|
|
if (ret)
|
|
ret = btrfs_scan_one_dir("/dev", run_ioctls);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
int pretty_len = 16;
|
|
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(pretty_len);
|
|
snprintf(pretty, pretty_len, "%.2f%s", fraction, size_strs[num_divs-1]);
|
|
return pretty;
|
|
}
|
|
|
|
/*
|
|
* Checks to make sure that the label matches our requirements.
|
|
* Returns:
|
|
0 if everything is safe and usable
|
|
-1 if the label is too long
|
|
-2 if the label contains an invalid character
|
|
*/
|
|
int check_label(char *input)
|
|
{
|
|
int i;
|
|
int len = strlen(input);
|
|
|
|
if (len > BTRFS_LABEL_SIZE) {
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (input[i] == '/' || input[i] == '\\') {
|
|
return -2;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_scan_block_devices(int run_ioctl)
|
|
{
|
|
|
|
struct stat st;
|
|
int ret;
|
|
int fd;
|
|
struct btrfs_fs_devices *tmp_devices;
|
|
u64 num_devices;
|
|
FILE *proc_partitions;
|
|
int i;
|
|
char buf[1024];
|
|
char fullpath[110];
|
|
int scans = 0;
|
|
int special;
|
|
|
|
scan_again:
|
|
proc_partitions = fopen("/proc/partitions","r");
|
|
if (!proc_partitions) {
|
|
fprintf(stderr, "Unable to open '/proc/partitions' for scanning\n");
|
|
return -ENOENT;
|
|
}
|
|
/* skip the header */
|
|
for(i=0; i < 2 ; i++)
|
|
if(!fgets(buf, 1023, proc_partitions)){
|
|
fprintf(stderr, "Unable to read '/proc/partitions' for scanning\n");
|
|
fclose(proc_partitions);
|
|
return -ENOENT;
|
|
}
|
|
|
|
strcpy(fullpath,"/dev/");
|
|
while(fgets(buf, 1023, proc_partitions)) {
|
|
i = sscanf(buf," %*d %*d %*d %99s", fullpath+5);
|
|
|
|
/*
|
|
* multipath and MD devices may register as a btrfs filesystem
|
|
* both through the original block device and through
|
|
* the special (/dev/mapper or /dev/mdX) entry.
|
|
* This scans the special entries last
|
|
*/
|
|
special = strncmp(fullpath, "/dev/dm-", strlen("/dev/dm-")) == 0;
|
|
if (!special)
|
|
special = strncmp(fullpath, "/dev/md", strlen("/dev/md")) == 0;
|
|
|
|
if (scans == 0 && special)
|
|
continue;
|
|
if (scans > 0 && !special)
|
|
continue;
|
|
|
|
ret = lstat(fullpath, &st);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "failed to stat %s\n", fullpath);
|
|
continue;
|
|
}
|
|
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);
|
|
}
|
|
|
|
fclose(proc_partitions);
|
|
|
|
if (scans == 0) {
|
|
scans++;
|
|
goto scan_again;
|
|
}
|
|
return 0;
|
|
}
|
|
|