10b86a832SChris Mason /* 20b86a832SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 30b86a832SChris Mason * 40b86a832SChris Mason * This program is free software; you can redistribute it and/or 50b86a832SChris Mason * modify it under the terms of the GNU General Public 60b86a832SChris Mason * License v2 as published by the Free Software Foundation. 70b86a832SChris Mason * 80b86a832SChris Mason * This program is distributed in the hope that it will be useful, 90b86a832SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 100b86a832SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 110b86a832SChris Mason * General Public License for more details. 120b86a832SChris Mason * 130b86a832SChris Mason * You should have received a copy of the GNU General Public 140b86a832SChris Mason * License along with this program; if not, write to the 150b86a832SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 160b86a832SChris Mason * Boston, MA 021110-1307, USA. 170b86a832SChris Mason */ 180b86a832SChris Mason 190b86a832SChris Mason #ifndef __BTRFS_VOLUMES_ 200b86a832SChris Mason #define __BTRFS_VOLUMES_ 218790d502SChris Mason 22cea9e445SChris Mason #include <linux/bio.h> 23b2117a39SMiao Xie #include <linux/sort.h> 248b712842SChris Mason #include "async-thread.h" 25cea9e445SChris Mason 26b2117a39SMiao Xie #define BTRFS_STRIPE_LEN (64 * 1024) 27b2117a39SMiao Xie 28f2984462SChris Mason struct buffer_head; 29ffbd517dSChris Mason struct btrfs_pending_bios { 30ffbd517dSChris Mason struct bio *head; 31ffbd517dSChris Mason struct bio *tail; 32ffbd517dSChris Mason }; 33ffbd517dSChris Mason 340b86a832SChris Mason struct btrfs_device { 350b86a832SChris Mason struct list_head dev_list; 36b3075717SChris Mason struct list_head dev_alloc_list; 372b82032cSYan Zheng struct btrfs_fs_devices *fs_devices; 380b86a832SChris Mason struct btrfs_root *dev_root; 39ffbd517dSChris Mason 40ffbd517dSChris Mason /* regular prio bios */ 41ffbd517dSChris Mason struct btrfs_pending_bios pending_bios; 42ffbd517dSChris Mason /* WRITE_SYNC bios */ 43ffbd517dSChris Mason struct btrfs_pending_bios pending_sync_bios; 44ffbd517dSChris Mason 458b712842SChris Mason int running_pending; 46dfe25020SChris Mason u64 generation; 47b3075717SChris Mason 482b82032cSYan Zheng int writeable; 49dfe25020SChris Mason int in_fs_metadata; 50cd02dca5SChris Mason int missing; 51d5e2003cSJosef Bacik int can_discard; 52b3075717SChris Mason 538790d502SChris Mason spinlock_t io_lock; 540b86a832SChris Mason 550b86a832SChris Mason struct block_device *bdev; 560b86a832SChris Mason 57d4d77629STejun Heo /* the mode sent to blkdev_get */ 5815916de8SChris Mason fmode_t mode; 5915916de8SChris Mason 608a4b83ccSChris Mason char *name; 618a4b83ccSChris Mason 620b86a832SChris Mason /* the internal btrfs device id */ 630b86a832SChris Mason u64 devid; 640b86a832SChris Mason 650b86a832SChris Mason /* size of the device */ 660b86a832SChris Mason u64 total_bytes; 670b86a832SChris Mason 68d6397baeSChris Ball /* size of the disk */ 69d6397baeSChris Ball u64 disk_total_bytes; 70d6397baeSChris Ball 710b86a832SChris Mason /* bytes used */ 720b86a832SChris Mason u64 bytes_used; 730b86a832SChris Mason 740b86a832SChris Mason /* optimal io alignment for this device */ 750b86a832SChris Mason u32 io_align; 760b86a832SChris Mason 770b86a832SChris Mason /* optimal io width for this device */ 780b86a832SChris Mason u32 io_width; 790b86a832SChris Mason 800b86a832SChris Mason /* minimal io size for this device */ 810b86a832SChris Mason u32 sector_size; 820b86a832SChris Mason 830b86a832SChris Mason /* type and info about this device */ 840b86a832SChris Mason u64 type; 850b86a832SChris Mason 860b86a832SChris Mason /* physical drive uuid (or lvm uuid) */ 87e17cade2SChris Mason u8 uuid[BTRFS_UUID_SIZE]; 888b712842SChris Mason 89a2de733cSArne Jansen /* per-device scrub information */ 90a2de733cSArne Jansen struct scrub_dev *scrub_device; 91a2de733cSArne Jansen 928b712842SChris Mason struct btrfs_work work; 931f78160cSXiao Guangrong struct rcu_head rcu; 941f78160cSXiao Guangrong struct work_struct rcu_work; 9590519d66SArne Jansen 9690519d66SArne Jansen /* readahead state */ 9790519d66SArne Jansen spinlock_t reada_lock; 9890519d66SArne Jansen atomic_t reada_in_flight; 9990519d66SArne Jansen u64 reada_next; 10090519d66SArne Jansen struct reada_zone *reada_curr_zone; 10190519d66SArne Jansen struct radix_tree_root reada_zones; 10290519d66SArne Jansen struct radix_tree_root reada_extents; 103387125fcSChris Mason 104387125fcSChris Mason /* for sending down flush barriers */ 105387125fcSChris Mason struct bio *flush_bio; 106387125fcSChris Mason struct completion flush_wait; 107387125fcSChris Mason int nobarriers; 108387125fcSChris Mason 1090b86a832SChris Mason }; 1100b86a832SChris Mason 1118a4b83ccSChris Mason struct btrfs_fs_devices { 1128a4b83ccSChris Mason u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 1138a4b83ccSChris Mason 114d4a78947SWu Fengguang /* the device with this id has the most recent copy of the super */ 1158a4b83ccSChris Mason u64 latest_devid; 1168a4b83ccSChris Mason u64 latest_trans; 1178a4b83ccSChris Mason u64 num_devices; 118a0af469bSChris Mason u64 open_devices; 1192b82032cSYan Zheng u64 rw_devices; 120cd02dca5SChris Mason u64 missing_devices; 1212b82032cSYan Zheng u64 total_rw_bytes; 122d5e2003cSJosef Bacik u64 num_can_discard; 1238a4b83ccSChris Mason struct block_device *latest_bdev; 124e5e9a520SChris Mason 125e5e9a520SChris Mason /* all of the devices in the FS, protected by a mutex 126e5e9a520SChris Mason * so we can safely walk it to write out the supers without 127e5e9a520SChris Mason * worrying about add/remove by the multi-device code 128e5e9a520SChris Mason */ 129e5e9a520SChris Mason struct mutex device_list_mutex; 1308a4b83ccSChris Mason struct list_head devices; 131b3075717SChris Mason 132b3075717SChris Mason /* devices not currently being allocated */ 133b3075717SChris Mason struct list_head alloc_list; 1348a4b83ccSChris Mason struct list_head list; 1352b82032cSYan Zheng 1362b82032cSYan Zheng struct btrfs_fs_devices *seed; 1372b82032cSYan Zheng int seeding; 1382b82032cSYan Zheng 1392b82032cSYan Zheng int opened; 140c289811cSChris Mason 141c289811cSChris Mason /* set when we find or add a device that doesn't have the 142c289811cSChris Mason * nonrot flag set 143c289811cSChris Mason */ 144c289811cSChris Mason int rotating; 1458a4b83ccSChris Mason }; 1468a4b83ccSChris Mason 147cea9e445SChris Mason struct btrfs_bio_stripe { 148cea9e445SChris Mason struct btrfs_device *dev; 149cea9e445SChris Mason u64 physical; 150fce3bb9aSLi Dongyang u64 length; /* only used for discard mappings */ 151cea9e445SChris Mason }; 152cea9e445SChris Mason 153a1d3c478SJan Schmidt struct btrfs_bio; 154a1d3c478SJan Schmidt typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err); 155a1d3c478SJan Schmidt 156a1d3c478SJan Schmidt struct btrfs_bio { 157cea9e445SChris Mason atomic_t stripes_pending; 158cea9e445SChris Mason bio_end_io_t *end_io; 1597d2b4daaSChris Mason struct bio *orig_bio; 160cea9e445SChris Mason void *private; 161a236aed1SChris Mason atomic_t error; 162a236aed1SChris Mason int max_errors; 163cea9e445SChris Mason int num_stripes; 164a1d3c478SJan Schmidt int mirror_num; 165cea9e445SChris Mason struct btrfs_bio_stripe stripes[]; 166cea9e445SChris Mason }; 167cea9e445SChris Mason 168b2117a39SMiao Xie struct btrfs_device_info { 169b2117a39SMiao Xie struct btrfs_device *dev; 170b2117a39SMiao Xie u64 dev_offset; 171b2117a39SMiao Xie u64 max_avail; 17273c5de00SArne Jansen u64 total_avail; 173b2117a39SMiao Xie }; 174b2117a39SMiao Xie 1751abe9b8aSliubo struct map_lookup { 1761abe9b8aSliubo u64 type; 1771abe9b8aSliubo int io_align; 1781abe9b8aSliubo int io_width; 1791abe9b8aSliubo int stripe_len; 1801abe9b8aSliubo int sector_size; 1811abe9b8aSliubo int num_stripes; 1821abe9b8aSliubo int sub_stripes; 1831abe9b8aSliubo struct btrfs_bio_stripe stripes[]; 1841abe9b8aSliubo }; 1851abe9b8aSliubo 186a2de733cSArne Jansen #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 187a2de733cSArne Jansen (sizeof(struct btrfs_bio_stripe) * (n))) 188a2de733cSArne Jansen 189f43ffb60SIlya Dryomov /* 190f43ffb60SIlya Dryomov * Restriper's general type filter 191f43ffb60SIlya Dryomov */ 192f43ffb60SIlya Dryomov #define BTRFS_BALANCE_DATA (1ULL << 0) 193f43ffb60SIlya Dryomov #define BTRFS_BALANCE_SYSTEM (1ULL << 1) 194f43ffb60SIlya Dryomov #define BTRFS_BALANCE_METADATA (1ULL << 2) 195f43ffb60SIlya Dryomov 196f43ffb60SIlya Dryomov #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \ 197f43ffb60SIlya Dryomov BTRFS_BALANCE_SYSTEM | \ 198f43ffb60SIlya Dryomov BTRFS_BALANCE_METADATA) 199ed25e9b2SIlya Dryomov /* 200ed25e9b2SIlya Dryomov * Balance filters 201ed25e9b2SIlya Dryomov */ 202ed25e9b2SIlya Dryomov #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0) 2035ce5b3c0SIlya Dryomov #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1) 204409d404bSIlya Dryomov #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2) 205f43ffb60SIlya Dryomov 206c9e9f97bSIlya Dryomov struct btrfs_balance_args; 207c9e9f97bSIlya Dryomov struct btrfs_balance_control { 208c9e9f97bSIlya Dryomov struct btrfs_fs_info *fs_info; 209c9e9f97bSIlya Dryomov 210c9e9f97bSIlya Dryomov struct btrfs_balance_args data; 211c9e9f97bSIlya Dryomov struct btrfs_balance_args meta; 212c9e9f97bSIlya Dryomov struct btrfs_balance_args sys; 213c9e9f97bSIlya Dryomov 214c9e9f97bSIlya Dryomov u64 flags; 215c9e9f97bSIlya Dryomov }; 216c9e9f97bSIlya Dryomov 2176d07bcecSMiao Xie int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 2186d07bcecSMiao Xie u64 end, u64 *length); 2196d07bcecSMiao Xie 220a1d3c478SJan Schmidt #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \ 221cea9e445SChris Mason (sizeof(struct btrfs_bio_stripe) * (n))) 222cea9e445SChris Mason 2230b86a832SChris Mason int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 2240b86a832SChris Mason struct btrfs_device *device, 225e17cade2SChris Mason u64 chunk_tree, u64 chunk_objectid, 2262b82032cSYan Zheng u64 chunk_offset, u64 start, u64 num_bytes); 227cea9e445SChris Mason int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 228cea9e445SChris Mason u64 logical, u64 *length, 229a1d3c478SJan Schmidt struct btrfs_bio **bbio_ret, int mirror_num); 230a512bbf8SYan Zheng int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 231a512bbf8SYan Zheng u64 chunk_start, u64 physical, u64 devid, 232a512bbf8SYan Zheng u64 **logical, int *naddrs, int *stripe_len); 233e4404d6eSYan Zheng int btrfs_read_sys_array(struct btrfs_root *root); 2340b86a832SChris Mason int btrfs_read_chunk_tree(struct btrfs_root *root); 2350b86a832SChris Mason int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 2362b82032cSYan Zheng struct btrfs_root *extent_root, u64 type); 2370b86a832SChris Mason void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 2380b86a832SChris Mason void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 239f188591eSChris Mason int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 2408b712842SChris Mason int mirror_num, int async_submit); 2418a4b83ccSChris Mason int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 24297288f2cSChristoph Hellwig fmode_t flags, void *holder); 24397288f2cSChristoph Hellwig int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 2448a4b83ccSChris Mason struct btrfs_fs_devices **fs_devices_ret); 2458a4b83ccSChris Mason int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 246dfe25020SChris Mason int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 2478a4b83ccSChris Mason int btrfs_add_device(struct btrfs_trans_handle *trans, 2488a4b83ccSChris Mason struct btrfs_root *root, 2498a4b83ccSChris Mason struct btrfs_device *device); 250a061fc8dSChris Mason int btrfs_rm_device(struct btrfs_root *root, char *device_path); 2518a4b83ccSChris Mason int btrfs_cleanup_fs_uuids(void); 252f188591eSChris Mason int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 2538f18cf13SChris Mason int btrfs_grow_device(struct btrfs_trans_handle *trans, 2548f18cf13SChris Mason struct btrfs_device *device, u64 new_size); 2558f18cf13SChris Mason struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 2562b82032cSYan Zheng u8 *uuid, u8 *fsid); 2578f18cf13SChris Mason int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 258788f20ebSChris Mason int btrfs_init_new_device(struct btrfs_root *root, char *path); 259c9e9f97bSIlya Dryomov int btrfs_balance(struct btrfs_balance_control *bctl, 260c9e9f97bSIlya Dryomov struct btrfs_ioctl_balance_args *bargs); 2612b82032cSYan Zheng int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 262ba1bf481SJosef Bacik int find_free_dev_extent(struct btrfs_trans_handle *trans, 263ba1bf481SJosef Bacik struct btrfs_device *device, u64 num_bytes, 264ba1bf481SJosef Bacik u64 *start, u64 *max_avail); 2650b86a832SChris Mason #endif 266