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; 950b86a832SChris Mason }; 960b86a832SChris Mason 978a4b83ccSChris Mason struct btrfs_fs_devices { 988a4b83ccSChris Mason u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 998a4b83ccSChris Mason 100d4a78947SWu Fengguang /* the device with this id has the most recent copy of the super */ 1018a4b83ccSChris Mason u64 latest_devid; 1028a4b83ccSChris Mason u64 latest_trans; 1038a4b83ccSChris Mason u64 num_devices; 104a0af469bSChris Mason u64 open_devices; 1052b82032cSYan Zheng u64 rw_devices; 106cd02dca5SChris Mason u64 missing_devices; 1072b82032cSYan Zheng u64 total_rw_bytes; 108d5e2003cSJosef Bacik u64 num_can_discard; 1098a4b83ccSChris Mason struct block_device *latest_bdev; 110e5e9a520SChris Mason 111e5e9a520SChris Mason /* all of the devices in the FS, protected by a mutex 112e5e9a520SChris Mason * so we can safely walk it to write out the supers without 113e5e9a520SChris Mason * worrying about add/remove by the multi-device code 114e5e9a520SChris Mason */ 115e5e9a520SChris Mason struct mutex device_list_mutex; 1168a4b83ccSChris Mason struct list_head devices; 117b3075717SChris Mason 118b3075717SChris Mason /* devices not currently being allocated */ 119b3075717SChris Mason struct list_head alloc_list; 1208a4b83ccSChris Mason struct list_head list; 1212b82032cSYan Zheng 1222b82032cSYan Zheng struct btrfs_fs_devices *seed; 1232b82032cSYan Zheng int seeding; 1242b82032cSYan Zheng 1252b82032cSYan Zheng int opened; 126c289811cSChris Mason 127c289811cSChris Mason /* set when we find or add a device that doesn't have the 128c289811cSChris Mason * nonrot flag set 129c289811cSChris Mason */ 130c289811cSChris Mason int rotating; 1318a4b83ccSChris Mason }; 1328a4b83ccSChris Mason 133cea9e445SChris Mason struct btrfs_bio_stripe { 134cea9e445SChris Mason struct btrfs_device *dev; 135cea9e445SChris Mason u64 physical; 136fce3bb9aSLi Dongyang u64 length; /* only used for discard mappings */ 137cea9e445SChris Mason }; 138cea9e445SChris Mason 139cea9e445SChris Mason struct btrfs_multi_bio { 140cea9e445SChris Mason atomic_t stripes_pending; 141cea9e445SChris Mason bio_end_io_t *end_io; 1427d2b4daaSChris Mason struct bio *orig_bio; 143cea9e445SChris Mason void *private; 144a236aed1SChris Mason atomic_t error; 145a236aed1SChris Mason int max_errors; 146cea9e445SChris Mason int num_stripes; 147cea9e445SChris Mason struct btrfs_bio_stripe stripes[]; 148cea9e445SChris Mason }; 149cea9e445SChris Mason 150b2117a39SMiao Xie struct btrfs_device_info { 151b2117a39SMiao Xie struct btrfs_device *dev; 152b2117a39SMiao Xie u64 dev_offset; 153b2117a39SMiao Xie u64 max_avail; 15473c5de00SArne Jansen u64 total_avail; 155b2117a39SMiao Xie }; 156b2117a39SMiao Xie 1571abe9b8aSliubo struct map_lookup { 1581abe9b8aSliubo u64 type; 1591abe9b8aSliubo int io_align; 1601abe9b8aSliubo int io_width; 1611abe9b8aSliubo int stripe_len; 1621abe9b8aSliubo int sector_size; 1631abe9b8aSliubo int num_stripes; 1641abe9b8aSliubo int sub_stripes; 1651abe9b8aSliubo struct btrfs_bio_stripe stripes[]; 1661abe9b8aSliubo }; 1671abe9b8aSliubo 168a2de733cSArne Jansen #define map_lookup_size(n) (sizeof(struct map_lookup) + \ 169a2de733cSArne Jansen (sizeof(struct btrfs_bio_stripe) * (n))) 170a2de733cSArne Jansen 1716d07bcecSMiao Xie int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start, 1726d07bcecSMiao Xie u64 end, u64 *length); 1736d07bcecSMiao Xie 174cea9e445SChris Mason #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 175cea9e445SChris Mason (sizeof(struct btrfs_bio_stripe) * (n))) 176cea9e445SChris Mason 1770b86a832SChris Mason int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 1780b86a832SChris Mason struct btrfs_device *device, 179e17cade2SChris Mason u64 chunk_tree, u64 chunk_objectid, 1802b82032cSYan Zheng u64 chunk_offset, u64 start, u64 num_bytes); 181cea9e445SChris Mason int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 182cea9e445SChris Mason u64 logical, u64 *length, 183f188591eSChris Mason struct btrfs_multi_bio **multi_ret, int mirror_num); 184a512bbf8SYan Zheng int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 185a512bbf8SYan Zheng u64 chunk_start, u64 physical, u64 devid, 186a512bbf8SYan Zheng u64 **logical, int *naddrs, int *stripe_len); 187e4404d6eSYan Zheng int btrfs_read_sys_array(struct btrfs_root *root); 1880b86a832SChris Mason int btrfs_read_chunk_tree(struct btrfs_root *root); 1890b86a832SChris Mason int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 1902b82032cSYan Zheng struct btrfs_root *extent_root, u64 type); 1910b86a832SChris Mason void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 1920b86a832SChris Mason void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 193f188591eSChris Mason int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 1948b712842SChris Mason int mirror_num, int async_submit); 1958a4b83ccSChris Mason int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 19697288f2cSChristoph Hellwig fmode_t flags, void *holder); 19797288f2cSChristoph Hellwig int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 1988a4b83ccSChris Mason struct btrfs_fs_devices **fs_devices_ret); 1998a4b83ccSChris Mason int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 200dfe25020SChris Mason int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 2018a4b83ccSChris Mason int btrfs_add_device(struct btrfs_trans_handle *trans, 2028a4b83ccSChris Mason struct btrfs_root *root, 2038a4b83ccSChris Mason struct btrfs_device *device); 204a061fc8dSChris Mason int btrfs_rm_device(struct btrfs_root *root, char *device_path); 2058a4b83ccSChris Mason int btrfs_cleanup_fs_uuids(void); 206f188591eSChris Mason int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 2078f18cf13SChris Mason int btrfs_grow_device(struct btrfs_trans_handle *trans, 2088f18cf13SChris Mason struct btrfs_device *device, u64 new_size); 2098f18cf13SChris Mason struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 2102b82032cSYan Zheng u8 *uuid, u8 *fsid); 2118f18cf13SChris Mason int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 212788f20ebSChris Mason int btrfs_init_new_device(struct btrfs_root *root, char *path); 213ec44a35cSChris Mason int btrfs_balance(struct btrfs_root *dev_root); 2142b82032cSYan Zheng int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 215ba1bf481SJosef Bacik int find_free_dev_extent(struct btrfs_trans_handle *trans, 216ba1bf481SJosef Bacik struct btrfs_device *device, u64 num_bytes, 217ba1bf481SJosef Bacik u64 *start, u64 *max_avail); 2180b86a832SChris Mason #endif 219