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; 260b86a832SChris Mason struct btrfs_device { 270b86a832SChris Mason struct list_head dev_list; 28b3075717SChris Mason struct list_head dev_alloc_list; 292b82032cSYan Zheng struct btrfs_fs_devices *fs_devices; 300b86a832SChris Mason struct btrfs_root *dev_root; 318b712842SChris Mason struct bio *pending_bios; 328b712842SChris Mason struct bio *pending_bio_tail; 338b712842SChris Mason int running_pending; 34dfe25020SChris Mason u64 generation; 35b3075717SChris Mason 36f2984462SChris Mason int barriers; 372b82032cSYan Zheng int writeable; 38dfe25020SChris Mason int in_fs_metadata; 39b3075717SChris Mason 408790d502SChris Mason spinlock_t io_lock; 410b86a832SChris Mason 420b86a832SChris Mason struct block_device *bdev; 430b86a832SChris Mason 4415916de8SChris Mason /* the mode sent to open_bdev_exclusive */ 4515916de8SChris Mason fmode_t mode; 4615916de8SChris Mason 478a4b83ccSChris Mason char *name; 488a4b83ccSChris Mason 490b86a832SChris Mason /* the internal btrfs device id */ 500b86a832SChris Mason u64 devid; 510b86a832SChris Mason 520b86a832SChris Mason /* size of the device */ 530b86a832SChris Mason u64 total_bytes; 540b86a832SChris Mason 550b86a832SChris Mason /* bytes used */ 560b86a832SChris Mason u64 bytes_used; 570b86a832SChris Mason 580b86a832SChris Mason /* optimal io alignment for this device */ 590b86a832SChris Mason u32 io_align; 600b86a832SChris Mason 610b86a832SChris Mason /* optimal io width for this device */ 620b86a832SChris Mason u32 io_width; 630b86a832SChris Mason 640b86a832SChris Mason /* minimal io size for this device */ 650b86a832SChris Mason u32 sector_size; 660b86a832SChris Mason 670b86a832SChris Mason /* type and info about this device */ 680b86a832SChris Mason u64 type; 690b86a832SChris Mason 700b86a832SChris Mason /* physical drive uuid (or lvm uuid) */ 71e17cade2SChris Mason u8 uuid[BTRFS_UUID_SIZE]; 728b712842SChris Mason 738b712842SChris Mason struct btrfs_work work; 740b86a832SChris Mason }; 750b86a832SChris Mason 768a4b83ccSChris Mason struct btrfs_fs_devices { 778a4b83ccSChris Mason u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 788a4b83ccSChris Mason 79d4a78947SWu Fengguang /* the device with this id has the most recent copy of the super */ 808a4b83ccSChris Mason u64 latest_devid; 818a4b83ccSChris Mason u64 latest_trans; 828a4b83ccSChris Mason u64 num_devices; 83a0af469bSChris Mason u64 open_devices; 842b82032cSYan Zheng u64 rw_devices; 852b82032cSYan Zheng u64 total_rw_bytes; 868a4b83ccSChris Mason struct block_device *latest_bdev; 87b3075717SChris Mason /* all of the devices in the FS */ 888a4b83ccSChris Mason struct list_head devices; 89b3075717SChris Mason 90b3075717SChris Mason /* devices not currently being allocated */ 91b3075717SChris Mason struct list_head alloc_list; 928a4b83ccSChris Mason struct list_head list; 932b82032cSYan Zheng 942b82032cSYan Zheng struct btrfs_fs_devices *seed; 952b82032cSYan Zheng int seeding; 962b82032cSYan Zheng 972b82032cSYan Zheng int opened; 988a4b83ccSChris Mason }; 998a4b83ccSChris Mason 100cea9e445SChris Mason struct btrfs_bio_stripe { 101cea9e445SChris Mason struct btrfs_device *dev; 102cea9e445SChris Mason u64 physical; 103cea9e445SChris Mason }; 104cea9e445SChris Mason 105cea9e445SChris Mason struct btrfs_multi_bio { 106cea9e445SChris Mason atomic_t stripes_pending; 107cea9e445SChris Mason bio_end_io_t *end_io; 1087d2b4daaSChris Mason struct bio *orig_bio; 109cea9e445SChris Mason void *private; 110a236aed1SChris Mason atomic_t error; 111a236aed1SChris Mason int max_errors; 112cea9e445SChris Mason int num_stripes; 113cea9e445SChris Mason struct btrfs_bio_stripe stripes[]; 114cea9e445SChris Mason }; 115cea9e445SChris Mason 116cea9e445SChris Mason #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ 117cea9e445SChris Mason (sizeof(struct btrfs_bio_stripe) * (n))) 118cea9e445SChris Mason 1190b86a832SChris Mason int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, 1200b86a832SChris Mason struct btrfs_device *device, 121e17cade2SChris Mason u64 chunk_tree, u64 chunk_objectid, 1222b82032cSYan Zheng u64 chunk_offset, u64 start, u64 num_bytes); 123cea9e445SChris Mason int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, 124cea9e445SChris Mason u64 logical, u64 *length, 125f188591eSChris Mason struct btrfs_multi_bio **multi_ret, int mirror_num); 126a512bbf8SYan Zheng int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree, 127a512bbf8SYan Zheng u64 chunk_start, u64 physical, u64 devid, 128a512bbf8SYan Zheng u64 **logical, int *naddrs, int *stripe_len); 129e4404d6eSYan Zheng int btrfs_read_sys_array(struct btrfs_root *root); 1300b86a832SChris Mason int btrfs_read_chunk_tree(struct btrfs_root *root); 1310b86a832SChris Mason int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, 1322b82032cSYan Zheng struct btrfs_root *extent_root, u64 type); 1330b86a832SChris Mason void btrfs_mapping_init(struct btrfs_mapping_tree *tree); 1340b86a832SChris Mason void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); 135f188591eSChris Mason int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, 1368b712842SChris Mason int mirror_num, int async_submit); 1370d81ba5dSChris Mason int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); 1388a4b83ccSChris Mason int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, 13997288f2cSChristoph Hellwig fmode_t flags, void *holder); 14097288f2cSChristoph Hellwig int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, 1418a4b83ccSChris Mason struct btrfs_fs_devices **fs_devices_ret); 1428a4b83ccSChris Mason int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); 143dfe25020SChris Mason int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); 1448a4b83ccSChris Mason int btrfs_add_device(struct btrfs_trans_handle *trans, 1458a4b83ccSChris Mason struct btrfs_root *root, 1468a4b83ccSChris Mason struct btrfs_device *device); 147a061fc8dSChris Mason int btrfs_rm_device(struct btrfs_root *root, char *device_path); 1488a4b83ccSChris Mason int btrfs_cleanup_fs_uuids(void); 149f188591eSChris Mason int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); 150f2d8d74dSChris Mason int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, 151f2d8d74dSChris Mason u64 logical, struct page *page); 1528f18cf13SChris Mason int btrfs_grow_device(struct btrfs_trans_handle *trans, 1538f18cf13SChris Mason struct btrfs_device *device, u64 new_size); 1548f18cf13SChris Mason struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, 1552b82032cSYan Zheng u8 *uuid, u8 *fsid); 1568f18cf13SChris Mason int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); 157788f20ebSChris Mason int btrfs_init_new_device(struct btrfs_root *root, char *path); 158ec44a35cSChris Mason int btrfs_balance(struct btrfs_root *dev_root); 159a061fc8dSChris Mason void btrfs_unlock_volumes(void); 160a061fc8dSChris Mason void btrfs_lock_volumes(void); 1612b82032cSYan Zheng int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); 1620b86a832SChris Mason #endif 163