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> 23cea9e445SChris Mason 24f2984462SChris Mason struct buffer_head; 250b86a832SChris Mason struct btrfs_device { 260b86a832SChris Mason struct list_head dev_list; 27b3075717SChris Mason struct list_head dev_alloc_list; 280b86a832SChris Mason struct btrfs_root *dev_root; 29f2984462SChris Mason struct buffer_head *pending_io; 30dfe25020SChris Mason u64 generation; 31b3075717SChris Mason 32f2984462SChris Mason int barriers; 33dfe25020SChris Mason int in_fs_metadata; 34b3075717SChris Mason 358790d502SChris Mason spinlock_t io_lock; 360b86a832SChris Mason 370b86a832SChris Mason struct block_device *bdev; 380b86a832SChris Mason 398790d502SChris Mason u64 total_ios; 408790d502SChris Mason 418a4b83ccSChris Mason char *name; 428a4b83ccSChris Mason 430b86a832SChris Mason /* the internal btrfs device id */ 440b86a832SChris Mason u64 devid; 450b86a832SChris Mason 460b86a832SChris Mason /* size of the device */ 470b86a832SChris Mason u64 total_bytes; 480b86a832SChris Mason 490b86a832SChris Mason /* bytes used */ 500b86a832SChris Mason u64 bytes_used; 510b86a832SChris Mason 520b86a832SChris Mason /* optimal io alignment for this device */ 530b86a832SChris Mason u32 io_align; 540b86a832SChris Mason 550b86a832SChris Mason /* optimal io width for this device */ 560b86a832SChris Mason u32 io_width; 570b86a832SChris Mason 580b86a832SChris Mason /* minimal io size for this device */ 590b86a832SChris Mason u32 sector_size; 600b86a832SChris Mason 610b86a832SChris Mason /* type and info about this device */ 620b86a832SChris Mason u64 type; 630b86a832SChris Mason 640b86a832SChris Mason /* physical drive uuid (or lvm uuid) */ 65e17cade2SChris Mason u8 uuid[BTRFS_UUID_SIZE]; 660b86a832SChris Mason }; 670b86a832SChris Mason 688a4b83ccSChris Mason struct btrfs_fs_devices { 698a4b83ccSChris Mason u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 708a4b83ccSChris Mason 718a4b83ccSChris Mason /* the device with this id has the most recent coyp of the super */ 728a4b83ccSChris Mason u64 latest_devid; 738a4b83ccSChris Mason u64 latest_trans; 748a4b83ccSChris Mason u64 lowest_devid; 758a4b83ccSChris Mason u64 num_devices; 768a4b83ccSChris Mason struct block_device *latest_bdev; 778a4b83ccSChris Mason struct block_device *lowest_bdev; 78b3075717SChris Mason /* all of the devices in the FS */ 798a4b83ccSChris Mason struct list_head devices; 80b3075717SChris Mason 81b3075717SChris Mason /* devices not currently being allocated */ 82b3075717SChris Mason struct list_head alloc_list; 838a4b83ccSChris Mason struct list_head list; 848a4b83ccSChris Mason }; 858a4b83ccSChris Mason 86cea9e445SChris Mason struct btrfs_bio_stripe { 87cea9e445SChris Mason struct btrfs_device *dev; 88cea9e445SChris Mason u64 physical; 89cea9e445SChris Mason }; 90cea9e445SChris Mason 91cea9e445SChris Mason struct btrfs_multi_bio { 92cea9e445SChris Mason atomic_t stripes_pending; 93cea9e445SChris Mason bio_end_io_t *end_io; 94cea9e445SChris Mason void *private; 95a236aed1SChris Mason atomic_t error; 96a236aed1SChris Mason int max_errors; 97cea9e445SChris Mason int num_stripes; 98cea9e445SChris Mason struct btrfs_bio_stripe stripes[]; 99cea9e445SChris Mason }; 100cea9e445SChris Mason 101cea9e445SChris Mason #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 102cea9e445SChris Mason (sizeof(struct btrfs_bio_stripe) * (n))) 103cea9e445SChris Mason 1040b86a832SChris Mason int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 1050b86a832SChris Mason struct btrfs_device *device, 106e17cade2SChris Mason u64 chunk_tree, u64 chunk_objectid, 107e17cade2SChris Mason u64 chunk_offset, 108e17cade2SChris Mason u64 num_bytes, u64 *start); 109cea9e445SChris Mason int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 110cea9e445SChris Mason u64 logical, u64 *length, 111f188591eSChris Mason struct btrfs_multi_bio **multi_ret, int mirror_num); 1120b86a832SChris Mason int btrfs_read_sys_array(struct btrfs_root *root); 1130b86a832SChris Mason int btrfs_read_chunk_tree(struct btrfs_root *root); 1140b86a832SChris Mason int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 1150b86a832SChris Mason struct btrfs_root *extent_root, u64 *start, 1166324fbf3SChris Mason u64 *num_bytes, u64 type); 1170b86a832SChris Mason void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 1180b86a832SChris Mason void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 119f188591eSChris Mason int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 120f188591eSChris Mason int mirror_num); 1210d81ba5dSChris Mason int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); 1228a4b83ccSChris Mason int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 1238a4b83ccSChris Mason int flags, void *holder); 1248a4b83ccSChris Mason int btrfs_scan_one_device(const char *path, int flags, void *holder, 1258a4b83ccSChris Mason struct btrfs_fs_devices **fs_devices_ret); 1268a4b83ccSChris Mason int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 127dfe25020SChris Mason int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 1288a4b83ccSChris Mason int btrfs_add_device(struct btrfs_trans_handle *trans, 1298a4b83ccSChris Mason struct btrfs_root *root, 1308a4b83ccSChris Mason struct btrfs_device *device); 131a061fc8dSChris Mason int btrfs_rm_device(struct btrfs_root *root, char *device_path); 1328a4b83ccSChris Mason int btrfs_cleanup_fs_uuids(void); 133f188591eSChris Mason int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 134f2d8d74dSChris Mason int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, 135f2d8d74dSChris Mason u64 logical, struct page *page); 1368f18cf13SChris Mason int btrfs_grow_device(struct btrfs_trans_handle *trans, 1378f18cf13SChris Mason struct btrfs_device *device, u64 new_size); 1388f18cf13SChris Mason struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 1398f18cf13SChris Mason u8 *uuid); 1408f18cf13SChris Mason int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 141788f20ebSChris Mason int btrfs_init_new_device(struct btrfs_root *root, char *path); 142ec44a35cSChris Mason int btrfs_balance(struct btrfs_root *dev_root); 143a061fc8dSChris Mason void btrfs_unlock_volumes(void); 144a061fc8dSChris Mason void btrfs_lock_volumes(void); 1450b86a832SChris Mason #endif 146