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https://github.com/kdave/btrfs-progs
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3c555beabf
There are two different subvolume/data reloc tree creation routines:
- create_subvol() from convert/main.c
* calls btrfs_copy_root() to create an empty root
This is not safe, as it relies on the source root to be empty.
* calls btrfs_read_fs_root() to add it to the cache and trace it
properly
* calls btrfs_make_root_dir() to initialize the empty new root
- create_data_reloc_tree() from mkfs/main.c
* calls btrfs_create_tree() to create an empty root
* Manually add the root to fs_root cache
This is only safe for data reloc tree as it's never updated
inside btrfs-progs.
But not safe for other subvolume trees.
* manually setup the root dir
Both have their good and bad aspects, so here we introduce a new helper,
btrfs_make_subvolume():
- Calls btrfs_create_tree() to create an empty root
- Calls btrfs_read_fs_root() to setup the cache and tracking properly
- Calls btrfs_make_root_dir() to initialize the root dir
- Calls btrfs_update_root() to reflect the rootdir change
So this new helper can replace both create_subvol() and
create_data_reloc_tree().
Signed-off-by: Qu Wenruo <wqu@suse.com>
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/*
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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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/*
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* Defines and function declarations for users of the mkfs API, no internal
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* definitions.
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*/
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#ifndef __BTRFS_MKFS_COMMON_H__
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#define __BTRFS_MKFS_COMMON_H__
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#include "kerncompat.h"
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#include <stdbool.h>
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#include "kernel-lib/sizes.h"
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#include "kernel-shared/uapi/btrfs_tree.h"
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#include "common/defs.h"
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#include "common/fsfeatures.h"
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struct btrfs_root;
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struct btrfs_trans_handle;
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#define BTRFS_MKFS_SYSTEM_GROUP_SIZE SZ_4M
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#define BTRFS_MKFS_SMALL_VOLUME_SIZE SZ_1G
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/*
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* Default settings for block group types
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*/
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#define BTRFS_MKFS_DEFAULT_DATA_ONE_DEVICE 0 /* SINGLE */
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#define BTRFS_MKFS_DEFAULT_META_ONE_DEVICE BTRFS_BLOCK_GROUP_DUP
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#define BTRFS_MKFS_DEFAULT_DATA_MULTI_DEVICE 0 /* SINGLE */
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#define BTRFS_MKFS_DEFAULT_META_MULTI_DEVICE BTRFS_BLOCK_GROUP_RAID1
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/*
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* Tree root blocks created during mkfs
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*/
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enum btrfs_mkfs_block {
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MKFS_ROOT_TREE,
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MKFS_EXTENT_TREE,
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MKFS_CHUNK_TREE,
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MKFS_DEV_TREE,
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MKFS_FS_TREE,
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MKFS_CSUM_TREE,
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MKFS_FREE_SPACE_TREE,
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MKFS_BLOCK_GROUP_TREE,
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/* MKFS_BLOCK_COUNT should be the max blocks we can have at mkfs time. */
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MKFS_BLOCK_COUNT
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};
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static const enum btrfs_mkfs_block default_blocks[] = {
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MKFS_ROOT_TREE,
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MKFS_EXTENT_TREE,
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MKFS_CHUNK_TREE,
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MKFS_DEV_TREE,
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MKFS_FS_TREE,
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MKFS_CSUM_TREE,
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MKFS_FREE_SPACE_TREE,
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};
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struct btrfs_mkfs_config {
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/* Label of the new filesystem */
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const char *label;
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/* Block sizes */
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u32 nodesize;
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u32 sectorsize;
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u32 stripesize;
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u32 leaf_data_size;
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struct btrfs_mkfs_features features;
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/* Size of the filesystem in bytes */
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u64 num_bytes;
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/* checksum algorithm to use */
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enum btrfs_csum_type csum_type;
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u64 zone_size;
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/* Output fields, set during creation */
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/* Logical addresses of superblock [0] and other tree roots */
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u64 blocks[MKFS_BLOCK_COUNT + 1];
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/* btrfs_super_block filesystem uuid */
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char fs_uuid[BTRFS_UUID_UNPARSED_SIZE];
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/* Set the given uuid to super block device_item. */
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char dev_uuid[BTRFS_UUID_UNPARSED_SIZE];
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char chunk_uuid[BTRFS_UUID_UNPARSED_SIZE];
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/* Superblock offset after make_btrfs */
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u64 super_bytenr;
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};
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int make_btrfs(int fd, struct btrfs_mkfs_config *cfg);
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u64 btrfs_min_dev_size(u32 nodesize, bool mixed, u64 zone_size, u64 meta_profile,
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u64 data_profile);
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int test_minimum_size(const char *file, u64 min_dev_size);
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int is_vol_small(const char *file);
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int test_num_disk_vs_raid(u64 metadata_profile, u64 data_profile,
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u64 dev_cnt, int mixed, int ssd);
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bool test_status_for_mkfs(const char *file, bool force_overwrite);
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bool test_dev_for_mkfs(const char *file, int force_overwrite);
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#endif
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