forked from Mirrors/btrfs-progs
320 lines
9.6 KiB
C
320 lines
9.6 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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#ifndef __BTRFS_VOLUMES_H__
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#define __BTRFS_VOLUMES_H__
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#include "kerncompat.h"
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#include "ctree.h"
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#define BTRFS_STRIPE_LEN SZ_64K
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struct btrfs_device {
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struct list_head dev_list;
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struct btrfs_root *dev_root;
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struct btrfs_fs_devices *fs_devices;
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u64 total_ios;
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int fd;
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int writeable;
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char *name;
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/* these are read off the super block, only in the progs */
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char *label;
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u64 total_devs;
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u64 super_bytes_used;
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u64 generation;
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/* the internal btrfs device id */
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u64 devid;
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/* size of the device */
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u64 total_bytes;
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/* bytes used */
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u64 bytes_used;
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/* optimal io alignment for this device */
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u32 io_align;
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/* optimal io width for this device */
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u32 io_width;
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/* minimal io size for this device */
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u32 sector_size;
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/* type and info about this device */
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u64 type;
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/* physical drive uuid (or lvm uuid) */
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u8 uuid[BTRFS_UUID_SIZE];
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};
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struct btrfs_fs_devices {
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u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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u8 metadata_uuid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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/* the device with this id has the most recent copy of the super */
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u64 latest_devid;
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u64 latest_trans;
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u64 lowest_devid;
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u64 total_rw_bytes;
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int latest_bdev;
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int lowest_bdev;
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struct list_head devices;
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struct list_head list;
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int seeding;
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struct btrfs_fs_devices *seed;
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};
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struct btrfs_bio_stripe {
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struct btrfs_device *dev;
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u64 physical;
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};
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struct btrfs_multi_bio {
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int error;
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int num_stripes;
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struct btrfs_bio_stripe stripes[];
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};
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struct map_lookup {
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struct cache_extent ce;
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u64 type;
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int io_align;
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int io_width;
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int stripe_len;
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int sector_size;
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int num_stripes;
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int sub_stripes;
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struct btrfs_bio_stripe stripes[];
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};
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struct btrfs_raid_attr {
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int sub_stripes; /* sub_stripes info for map */
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int dev_stripes; /* stripes per dev */
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int devs_max; /* max devs to use */
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int devs_min; /* min devs needed */
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int tolerated_failures; /* max tolerated fail devs */
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int devs_increment; /* ndevs has to be a multiple of this */
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int ncopies; /* how many copies to data has */
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int nparity; /* number of stripes worth of bytes to store
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* parity information */
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int mindev_error; /* error code if min devs requisite is unmet */
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const char raid_name[8]; /* name of the raid */
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u64 bg_flag; /* block group flag of the raid */
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};
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extern const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES];
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static inline enum btrfs_raid_types btrfs_bg_flags_to_raid_index(u64 flags)
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{
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if (flags & BTRFS_BLOCK_GROUP_RAID10)
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return BTRFS_RAID_RAID10;
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else if (flags & BTRFS_BLOCK_GROUP_RAID1)
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return BTRFS_RAID_RAID1;
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else if (flags & BTRFS_BLOCK_GROUP_RAID1C3)
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return BTRFS_RAID_RAID1C3;
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else if (flags & BTRFS_BLOCK_GROUP_RAID1C4)
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return BTRFS_RAID_RAID1C4;
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else if (flags & BTRFS_BLOCK_GROUP_DUP)
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return BTRFS_RAID_DUP;
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else if (flags & BTRFS_BLOCK_GROUP_RAID0)
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return BTRFS_RAID_RAID0;
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else if (flags & BTRFS_BLOCK_GROUP_RAID5)
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return BTRFS_RAID_RAID5;
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else if (flags & BTRFS_BLOCK_GROUP_RAID6)
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return BTRFS_RAID_RAID6;
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return BTRFS_RAID_SINGLE; /* BTRFS_BLOCK_GROUP_SINGLE */
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}
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#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
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(sizeof(struct btrfs_bio_stripe) * (n)))
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#define btrfs_map_lookup_size(n) (sizeof(struct map_lookup) + \
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(sizeof(struct btrfs_bio_stripe) * (n)))
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/*
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* Restriper's general type filter
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*/
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#define BTRFS_BALANCE_DATA (1ULL << 0)
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#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
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#define BTRFS_BALANCE_METADATA (1ULL << 2)
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#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
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BTRFS_BALANCE_SYSTEM | \
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BTRFS_BALANCE_METADATA)
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#define BTRFS_BALANCE_FORCE (1ULL << 3)
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#define BTRFS_BALANCE_RESUME (1ULL << 4)
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/*
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* Balance filters
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*/
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#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
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#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
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#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
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#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
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#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
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#define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
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#define BTRFS_BALANCE_ARGS_LIMIT_RANGE (1ULL << 6)
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#define BTRFS_BALANCE_ARGS_STRIPES_RANGE (1ULL << 7)
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#define BTRFS_BALANCE_ARGS_USAGE_RANGE (1ULL << 10)
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/*
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* Profile changing flags. When SOFT is set we won't relocate chunk if
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* it already has the target profile (even though it may be
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* half-filled).
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*/
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#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
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#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
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#define BTRFS_RAID5_P_STRIPE ((u64)-2)
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#define BTRFS_RAID6_Q_STRIPE ((u64)-1)
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/*
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* Check if the given range cross stripes.
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* To ensure kernel scrub won't causing bug on with METADATA in mixed
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* block group
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*
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* Return 1 if the range crosses STRIPE boundary
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* Return 0 if the range doesn't cross STRIPE boundary or it
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* doesn't belong to any block group (no boundary to cross)
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*/
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static inline int check_crossing_stripes(struct btrfs_fs_info *fs_info,
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u64 start, u64 len)
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{
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struct btrfs_block_group_cache *bg_cache;
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u64 bg_offset;
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bg_cache = btrfs_lookup_block_group(fs_info, start);
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/*
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* Does not belong to block group, no boundary to cross
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* although it's a bigger problem, but here we don't care.
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*/
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if (!bg_cache)
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return 0;
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bg_offset = start - bg_cache->key.objectid;
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return (bg_offset / BTRFS_STRIPE_LEN !=
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(bg_offset + len - 1) / BTRFS_STRIPE_LEN);
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}
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static inline u64 calc_stripe_length(u64 type, u64 length, int num_stripes)
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{
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u64 stripe_size;
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if (type & BTRFS_BLOCK_GROUP_RAID0) {
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stripe_size = length;
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stripe_size /= num_stripes;
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} else if (type & BTRFS_BLOCK_GROUP_RAID10) {
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stripe_size = length * 2;
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stripe_size /= num_stripes;
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} else if (type & BTRFS_BLOCK_GROUP_RAID5) {
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stripe_size = length;
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stripe_size /= (num_stripes - 1);
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} else if (type & BTRFS_BLOCK_GROUP_RAID6) {
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stripe_size = length;
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stripe_size /= (num_stripes - 2);
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} else {
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stripe_size = length;
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}
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return stripe_size;
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}
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int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
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u64 logical, u64 *length, u64 *type,
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struct btrfs_multi_bio **multi_ret, int mirror_num,
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u64 **raid_map);
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int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
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u64 logical, u64 *length,
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struct btrfs_multi_bio **multi_ret, int mirror_num,
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u64 **raid_map_ret);
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int btrfs_next_bg(struct btrfs_fs_info *map_tree, u64 *logical,
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u64 *size, u64 type);
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static inline int btrfs_next_bg_metadata(struct btrfs_fs_info *fs_info,
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u64 *logical, u64 *size)
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{
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return btrfs_next_bg(fs_info, logical, size,
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BTRFS_BLOCK_GROUP_METADATA);
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}
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static inline int btrfs_next_bg_system(struct btrfs_fs_info *fs_info,
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u64 *logical, u64 *size)
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{
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return btrfs_next_bg(fs_info, logical, size,
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BTRFS_BLOCK_GROUP_SYSTEM);
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}
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int btrfs_rmap_block(struct btrfs_fs_info *fs_info,
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u64 chunk_start, u64 physical, u64 **logical,
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int *naddrs, int *stripe_len);
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int btrfs_read_sys_array(struct btrfs_fs_info *fs_info);
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int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info);
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int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 *start,
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u64 *num_bytes, u64 type);
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int btrfs_alloc_data_chunk(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info, u64 *start, u64 num_bytes);
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int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
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int flags);
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int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
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void btrfs_close_all_devices(void);
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int btrfs_insert_dev_extent(struct btrfs_trans_handle *trans,
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struct btrfs_device *device,
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u64 chunk_offset, u64 num_bytes, u64 start);
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int btrfs_add_device(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info,
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struct btrfs_device *device);
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int btrfs_update_device(struct btrfs_trans_handle *trans,
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struct btrfs_device *device);
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int btrfs_scan_one_device(int fd, const char *path,
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struct btrfs_fs_devices **fs_devices_ret,
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u64 *total_devs, u64 super_offset, unsigned sbflags);
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int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
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struct list_head *btrfs_scanned_uuids(void);
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int btrfs_add_system_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
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struct btrfs_chunk *chunk, int item_size);
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int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info, u64 chunk_offset);
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struct btrfs_device *
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btrfs_find_device_by_devid(struct btrfs_fs_devices *fs_devices,
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u64 devid, int instance);
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struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
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u8 *uuid, u8 *fsid);
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int write_raid56_with_parity(struct btrfs_fs_info *info,
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struct extent_buffer *eb,
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struct btrfs_multi_bio *multi,
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u64 stripe_len, u64 *raid_map);
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int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
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struct extent_buffer *leaf,
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struct btrfs_chunk *chunk,
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int slot, u64 logical);
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u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
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struct extent_buffer *leaf,
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struct btrfs_chunk *chunk);
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int btrfs_fix_device_size(struct btrfs_fs_info *fs_info,
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struct btrfs_device *device);
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int btrfs_fix_super_size(struct btrfs_fs_info *fs_info);
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int btrfs_fix_device_and_super_size(struct btrfs_fs_info *fs_info);
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#endif
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