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0b86a832 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #ifndef __BTRFS_VOLUMES_ | |
20 | #define __BTRFS_VOLUMES_ | |
8790d502 | 21 | |
cea9e445 CM |
22 | #include <linux/bio.h> |
23 | ||
f2984462 | 24 | struct buffer_head; |
0b86a832 CM |
25 | struct btrfs_device { |
26 | struct list_head dev_list; | |
b3075717 | 27 | struct list_head dev_alloc_list; |
0b86a832 | 28 | struct btrfs_root *dev_root; |
f2984462 | 29 | struct buffer_head *pending_io; |
b3075717 | 30 | |
f2984462 | 31 | int barriers; |
b3075717 | 32 | |
8790d502 | 33 | spinlock_t io_lock; |
0b86a832 CM |
34 | |
35 | struct block_device *bdev; | |
36 | ||
8790d502 CM |
37 | u64 total_ios; |
38 | ||
8a4b83cc CM |
39 | char *name; |
40 | ||
0b86a832 CM |
41 | /* the internal btrfs device id */ |
42 | u64 devid; | |
43 | ||
44 | /* size of the device */ | |
45 | u64 total_bytes; | |
46 | ||
47 | /* bytes used */ | |
48 | u64 bytes_used; | |
49 | ||
50 | /* optimal io alignment for this device */ | |
51 | u32 io_align; | |
52 | ||
53 | /* optimal io width for this device */ | |
54 | u32 io_width; | |
55 | ||
56 | /* minimal io size for this device */ | |
57 | u32 sector_size; | |
58 | ||
0b86a832 CM |
59 | /* type and info about this device */ |
60 | u64 type; | |
61 | ||
0b86a832 | 62 | /* physical drive uuid (or lvm uuid) */ |
e17cade2 | 63 | u8 uuid[BTRFS_UUID_SIZE]; |
0b86a832 CM |
64 | }; |
65 | ||
8a4b83cc CM |
66 | struct btrfs_fs_devices { |
67 | u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ | |
68 | ||
69 | /* the device with this id has the most recent coyp of the super */ | |
70 | u64 latest_devid; | |
71 | u64 latest_trans; | |
72 | u64 lowest_devid; | |
73 | u64 num_devices; | |
74 | struct block_device *latest_bdev; | |
75 | struct block_device *lowest_bdev; | |
b3075717 | 76 | /* all of the devices in the FS */ |
8a4b83cc | 77 | struct list_head devices; |
b3075717 CM |
78 | |
79 | /* devices not currently being allocated */ | |
80 | struct list_head alloc_list; | |
8a4b83cc CM |
81 | struct list_head list; |
82 | }; | |
83 | ||
cea9e445 CM |
84 | struct btrfs_bio_stripe { |
85 | struct btrfs_device *dev; | |
86 | u64 physical; | |
87 | }; | |
88 | ||
89 | struct btrfs_multi_bio { | |
90 | atomic_t stripes_pending; | |
91 | bio_end_io_t *end_io; | |
92 | void *private; | |
a236aed1 CM |
93 | atomic_t error; |
94 | int max_errors; | |
cea9e445 CM |
95 | int num_stripes; |
96 | struct btrfs_bio_stripe stripes[]; | |
97 | }; | |
98 | ||
99 | #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ | |
100 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
101 | ||
0b86a832 CM |
102 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
103 | struct btrfs_device *device, | |
e17cade2 CM |
104 | u64 chunk_tree, u64 chunk_objectid, |
105 | u64 chunk_offset, | |
106 | u64 num_bytes, u64 *start); | |
cea9e445 CM |
107 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
108 | u64 logical, u64 *length, | |
f188591e | 109 | struct btrfs_multi_bio **multi_ret, int mirror_num); |
0b86a832 CM |
110 | int btrfs_read_sys_array(struct btrfs_root *root); |
111 | int btrfs_read_chunk_tree(struct btrfs_root *root); | |
112 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
113 | struct btrfs_root *extent_root, u64 *start, | |
6324fbf3 | 114 | u64 *num_bytes, u64 type); |
0b86a832 CM |
115 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree); |
116 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); | |
f188591e CM |
117 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
118 | int mirror_num); | |
0d81ba5d | 119 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); |
8a4b83cc CM |
120 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
121 | int flags, void *holder); | |
122 | int btrfs_scan_one_device(const char *path, int flags, void *holder, | |
123 | struct btrfs_fs_devices **fs_devices_ret); | |
124 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); | |
125 | int btrfs_add_device(struct btrfs_trans_handle *trans, | |
126 | struct btrfs_root *root, | |
127 | struct btrfs_device *device); | |
128 | int btrfs_cleanup_fs_uuids(void); | |
f188591e | 129 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); |
f2d8d74d CM |
130 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
131 | u64 logical, struct page *page); | |
8f18cf13 CM |
132 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
133 | struct btrfs_device *device, u64 new_size); | |
134 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, | |
135 | u8 *uuid); | |
136 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); | |
788f20eb | 137 | int btrfs_init_new_device(struct btrfs_root *root, char *path); |
ec44a35c | 138 | int btrfs_balance(struct btrfs_root *dev_root); |
0b86a832 | 139 | #endif |