f1507716c6
The single profile is better suited as default for data on multiple devices. Switch from RAID0 because: - it's easier to convert to other profiles, as single consumes some chunks per device, but RAID0 has chunks on all devices regardless of the used space - RAID0 has no redundancy and compared one disk failure affects many files due to striping, while with single the chances are a bit higher that complete files are stored on one device - when the device sizes are not equal and not even close to equal, the maximum achievable size with RAID0 is size of the smallest device due to striping, with single it's the sum of all device sizes The changed defaults could affect scripts and deployments that rely on the old values, but given the number of possible profiles for multiple devices let's hope that they're specified explicitly in majority of cases. Issue: #270 Signed-off-by: David Sterba <dsterba@suse.com>
91 lines
2.6 KiB
C
91 lines
2.6 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 "common/defs.h"
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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_META_ONE_DEVICE_SSD 0 /* SINGLE */
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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_SUPER_BLOCK = 0,
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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_BLOCK_COUNT
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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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/* Bitfield of incompat features, BTRFS_FEATURE_INCOMPAT_* */
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u64 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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/* 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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char fs_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, int mixed, 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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int test_status_for_mkfs(const char *file, bool force_overwrite);
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int test_dev_for_mkfs(const char *file, int force_overwrite);
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#endif
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