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> 238b712842SChris Mason #include "async-thread.h" 24cea9e445SChris Mason 25f2984462SChris Mason struct buffer_head; 26ffbd517dSChris Mason struct btrfs_pending_bios { 27ffbd517dSChris Mason struct bio *head; 28ffbd517dSChris Mason struct bio *tail; 29ffbd517dSChris Mason }; 30ffbd517dSChris Mason 310b86a832SChris Mason struct btrfs_device { 320b86a832SChris Mason struct list_head dev_list; 33b3075717SChris Mason struct list_head dev_alloc_list; 342b82032cSYan Zheng struct btrfs_fs_devices *fs_devices; 350b86a832SChris Mason struct btrfs_root *dev_root; 36ffbd517dSChris Mason 37ffbd517dSChris Mason /* regular prio bios */ 38ffbd517dSChris Mason struct btrfs_pending_bios pending_bios; 39ffbd517dSChris Mason /* WRITE_SYNC bios */ 40ffbd517dSChris Mason struct btrfs_pending_bios pending_sync_bios; 41ffbd517dSChris Mason 428b712842SChris Mason int running_pending; 43dfe25020SChris Mason u64 generation; 44b3075717SChris Mason 452b82032cSYan Zheng int writeable; 46dfe25020SChris Mason int in_fs_metadata; 47b3075717SChris Mason 488790d502SChris Mason spinlock_t io_lock; 490b86a832SChris Mason 500b86a832SChris Mason struct block_device *bdev; 510b86a832SChris Mason 52d4d77629STejun Heo /* the mode sent to blkdev_get */ 5315916de8SChris Mason fmode_t mode; 5415916de8SChris Mason 558a4b83ccSChris Mason char *name; 568a4b83ccSChris Mason 570b86a832SChris Mason /* the internal btrfs device id */ 580b86a832SChris Mason u64 devid; 590b86a832SChris Mason 600b86a832SChris Mason /* size of the device */ 610b86a832SChris Mason u64 total_bytes; 620b86a832SChris Mason 63d6397baeSChris Ball /* size of the disk */ 64d6397baeSChris Ball u64 disk_total_bytes; 65d6397baeSChris Ball 660b86a832SChris Mason /* bytes used */ 670b86a832SChris Mason u64 bytes_used; 680b86a832SChris Mason 690b86a832SChris Mason /* optimal io alignment for this device */ 700b86a832SChris Mason u32 io_align; 710b86a832SChris Mason 720b86a832SChris Mason /* optimal io width for this device */ 730b86a832SChris Mason u32 io_width; 740b86a832SChris Mason 750b86a832SChris Mason /* minimal io size for this device */ 760b86a832SChris Mason u32 sector_size; 770b86a832SChris Mason 780b86a832SChris Mason /* type and info about this device */ 790b86a832SChris Mason u64 type; 800b86a832SChris Mason 810b86a832SChris Mason /* physical drive uuid (or lvm uuid) */ 82e17cade2SChris Mason u8 uuid[BTRFS_UUID_SIZE]; 838b712842SChris Mason 848b712842SChris Mason struct btrfs_work work; 850b86a832SChris Mason }; 860b86a832SChris Mason 878a4b83ccSChris Mason struct btrfs_fs_devices { 888a4b83ccSChris Mason u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 898a4b83ccSChris Mason 90d4a78947SWu Fengguang /* the device with this id has the most recent copy of the super */ 918a4b83ccSChris Mason u64 latest_devid; 928a4b83ccSChris Mason u64 latest_trans; 938a4b83ccSChris Mason u64 num_devices; 94a0af469bSChris Mason u64 open_devices; 952b82032cSYan Zheng u64 rw_devices; 962b82032cSYan Zheng u64 total_rw_bytes; 978a4b83ccSChris Mason struct block_device *latest_bdev; 98e5e9a520SChris Mason 99e5e9a520SChris Mason /* all of the devices in the FS, protected by a mutex 100e5e9a520SChris Mason * so we can safely walk it to write out the supers without 101e5e9a520SChris Mason * worrying about add/remove by the multi-device code 102e5e9a520SChris Mason */ 103e5e9a520SChris Mason struct mutex device_list_mutex; 1048a4b83ccSChris Mason struct list_head devices; 105b3075717SChris Mason 106b3075717SChris Mason /* devices not currently being allocated */ 107b3075717SChris Mason struct list_head alloc_list; 1088a4b83ccSChris Mason struct list_head list; 1092b82032cSYan Zheng 1102b82032cSYan Zheng struct btrfs_fs_devices *seed; 1112b82032cSYan Zheng int seeding; 1122b82032cSYan Zheng 1132b82032cSYan Zheng int opened; 114c289811cSChris Mason 115c289811cSChris Mason /* set when we find or add a device that doesn't have the 116c289811cSChris Mason * nonrot flag set 117c289811cSChris Mason */ 118c289811cSChris Mason int rotating; 1198a4b83ccSChris Mason }; 1208a4b83ccSChris Mason 121cea9e445SChris Mason struct btrfs_bio_stripe { 122cea9e445SChris Mason struct btrfs_device *dev; 123cea9e445SChris Mason u64 physical; 124cea9e445SChris Mason }; 125cea9e445SChris Mason 126cea9e445SChris Mason struct btrfs_multi_bio { 127cea9e445SChris Mason atomic_t stripes_pending; 128cea9e445SChris Mason bio_end_io_t *end_io; 1297d2b4daaSChris Mason struct bio *orig_bio; 130cea9e445SChris Mason void *private; 131a236aed1SChris Mason atomic_t error; 132a236aed1SChris Mason int max_errors; 133cea9e445SChris Mason int num_stripes; 134cea9e445SChris Mason struct btrfs_bio_stripe stripes[]; 135cea9e445SChris Mason }; 136cea9e445SChris Mason 137cea9e445SChris Mason #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 138cea9e445SChris Mason (sizeof(struct btrfs_bio_stripe) * (n))) 139cea9e445SChris Mason 1400b86a832SChris Mason int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 1410b86a832SChris Mason struct btrfs_device *device, 142e17cade2SChris Mason u64 chunk_tree, u64 chunk_objectid, 1432b82032cSYan Zheng u64 chunk_offset, u64 start, u64 num_bytes); 144cea9e445SChris Mason int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 145cea9e445SChris Mason u64 logical, u64 *length, 146f188591eSChris Mason struct btrfs_multi_bio **multi_ret, int mirror_num); 147a512bbf8SYan Zheng int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 148a512bbf8SYan Zheng u64 chunk_start, u64 physical, u64 devid, 149a512bbf8SYan Zheng u64 **logical, int *naddrs, int *stripe_len); 150e4404d6eSYan Zheng int btrfs_read_sys_array(struct btrfs_root *root); 1510b86a832SChris Mason int btrfs_read_chunk_tree(struct btrfs_root *root); 1520b86a832SChris Mason int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 1532b82032cSYan Zheng struct btrfs_root *extent_root, u64 type); 1540b86a832SChris Mason void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 1550b86a832SChris Mason void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 156f188591eSChris Mason int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 1578b712842SChris Mason int mirror_num, int async_submit); 1580d81ba5dSChris Mason int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); 1598a4b83ccSChris Mason int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 16097288f2cSChristoph Hellwig fmode_t flags, void *holder); 16197288f2cSChristoph Hellwig int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 1628a4b83ccSChris Mason struct btrfs_fs_devices **fs_devices_ret); 1638a4b83ccSChris Mason int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 164dfe25020SChris Mason int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 1658a4b83ccSChris Mason int btrfs_add_device(struct btrfs_trans_handle *trans, 1668a4b83ccSChris Mason struct btrfs_root *root, 1678a4b83ccSChris Mason struct btrfs_device *device); 168a061fc8dSChris Mason int btrfs_rm_device(struct btrfs_root *root, char *device_path); 1698a4b83ccSChris Mason int btrfs_cleanup_fs_uuids(void); 170f188591eSChris Mason int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 171f2d8d74dSChris Mason int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, 172f2d8d74dSChris Mason u64 logical, struct page *page); 1738f18cf13SChris Mason int btrfs_grow_device(struct btrfs_trans_handle *trans, 1748f18cf13SChris Mason struct btrfs_device *device, u64 new_size); 1758f18cf13SChris Mason struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 1762b82032cSYan Zheng u8 *uuid, u8 *fsid); 1778f18cf13SChris Mason int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 178788f20ebSChris Mason int btrfs_init_new_device(struct btrfs_root *root, char *path); 179ec44a35cSChris Mason int btrfs_balance(struct btrfs_root *dev_root); 180a061fc8dSChris Mason void btrfs_unlock_volumes(void); 181a061fc8dSChris Mason void btrfs_lock_volumes(void); 1822b82032cSYan Zheng int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 183ba1bf481SJosef Bacik int find_free_dev_extent(struct btrfs_trans_handle *trans, 184ba1bf481SJosef Bacik struct btrfs_device *device, u64 num_bytes, 185ba1bf481SJosef Bacik u64 *start, u64 *max_avail); 1860b86a832SChris Mason #endif 187