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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 | 22 | #include <linux/bio.h> |
8b712842 | 23 | #include "async-thread.h" |
cea9e445 | 24 | |
f2984462 | 25 | struct buffer_head; |
0b86a832 CM |
26 | struct btrfs_device { |
27 | struct list_head dev_list; | |
b3075717 | 28 | struct list_head dev_alloc_list; |
0b86a832 | 29 | struct btrfs_root *dev_root; |
f2984462 | 30 | struct buffer_head *pending_io; |
8b712842 CM |
31 | struct bio *pending_bios; |
32 | struct bio *pending_bio_tail; | |
33 | int running_pending; | |
dfe25020 | 34 | u64 generation; |
b3075717 | 35 | |
f2984462 | 36 | int barriers; |
dfe25020 | 37 | int in_fs_metadata; |
b3075717 | 38 | |
8790d502 | 39 | spinlock_t io_lock; |
0b86a832 CM |
40 | |
41 | struct block_device *bdev; | |
42 | ||
8a4b83cc CM |
43 | char *name; |
44 | ||
0b86a832 CM |
45 | /* the internal btrfs device id */ |
46 | u64 devid; | |
47 | ||
48 | /* size of the device */ | |
49 | u64 total_bytes; | |
50 | ||
51 | /* bytes used */ | |
52 | u64 bytes_used; | |
53 | ||
54 | /* optimal io alignment for this device */ | |
55 | u32 io_align; | |
56 | ||
57 | /* optimal io width for this device */ | |
58 | u32 io_width; | |
59 | ||
60 | /* minimal io size for this device */ | |
61 | u32 sector_size; | |
62 | ||
0b86a832 CM |
63 | /* type and info about this device */ |
64 | u64 type; | |
65 | ||
0b86a832 | 66 | /* physical drive uuid (or lvm uuid) */ |
e17cade2 | 67 | u8 uuid[BTRFS_UUID_SIZE]; |
8b712842 CM |
68 | |
69 | struct btrfs_work work; | |
0b86a832 CM |
70 | }; |
71 | ||
8a4b83cc CM |
72 | struct btrfs_fs_devices { |
73 | u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ | |
74 | ||
75 | /* the device with this id has the most recent coyp of the super */ | |
76 | u64 latest_devid; | |
77 | u64 latest_trans; | |
8a4b83cc | 78 | u64 num_devices; |
a0af469b | 79 | u64 open_devices; |
8a4b83cc | 80 | struct block_device *latest_bdev; |
b3075717 | 81 | /* all of the devices in the FS */ |
8a4b83cc | 82 | struct list_head devices; |
b3075717 CM |
83 | |
84 | /* devices not currently being allocated */ | |
85 | struct list_head alloc_list; | |
8a4b83cc | 86 | struct list_head list; |
a0af469b | 87 | int mounted; |
8a4b83cc CM |
88 | }; |
89 | ||
cea9e445 CM |
90 | struct btrfs_bio_stripe { |
91 | struct btrfs_device *dev; | |
92 | u64 physical; | |
93 | }; | |
94 | ||
95 | struct btrfs_multi_bio { | |
96 | atomic_t stripes_pending; | |
97 | bio_end_io_t *end_io; | |
98 | void *private; | |
a236aed1 CM |
99 | atomic_t error; |
100 | int max_errors; | |
cea9e445 CM |
101 | int num_stripes; |
102 | struct btrfs_bio_stripe stripes[]; | |
103 | }; | |
104 | ||
105 | #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ | |
106 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
107 | ||
0b86a832 CM |
108 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
109 | struct btrfs_device *device, | |
e17cade2 CM |
110 | u64 chunk_tree, u64 chunk_objectid, |
111 | u64 chunk_offset, | |
112 | u64 num_bytes, u64 *start); | |
cea9e445 CM |
113 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
114 | u64 logical, u64 *length, | |
f188591e | 115 | struct btrfs_multi_bio **multi_ret, int mirror_num); |
0b86a832 CM |
116 | int btrfs_read_sys_array(struct btrfs_root *root); |
117 | int btrfs_read_chunk_tree(struct btrfs_root *root); | |
118 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
119 | struct btrfs_root *extent_root, u64 *start, | |
6324fbf3 | 120 | u64 *num_bytes, u64 type); |
0b86a832 CM |
121 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree); |
122 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); | |
f188591e | 123 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 124 | int mirror_num, int async_submit); |
0d81ba5d | 125 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); |
8a4b83cc CM |
126 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
127 | int flags, void *holder); | |
128 | int btrfs_scan_one_device(const char *path, int flags, void *holder, | |
129 | struct btrfs_fs_devices **fs_devices_ret); | |
130 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); | |
dfe25020 | 131 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); |
8a4b83cc CM |
132 | int btrfs_add_device(struct btrfs_trans_handle *trans, |
133 | struct btrfs_root *root, | |
134 | struct btrfs_device *device); | |
a061fc8d | 135 | int btrfs_rm_device(struct btrfs_root *root, char *device_path); |
8a4b83cc | 136 | int btrfs_cleanup_fs_uuids(void); |
f188591e | 137 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); |
f2d8d74d CM |
138 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
139 | u64 logical, struct page *page); | |
8f18cf13 CM |
140 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
141 | struct btrfs_device *device, u64 new_size); | |
142 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, | |
143 | u8 *uuid); | |
144 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); | |
788f20eb | 145 | int btrfs_init_new_device(struct btrfs_root *root, char *path); |
ec44a35c | 146 | int btrfs_balance(struct btrfs_root *dev_root); |
a061fc8d CM |
147 | void btrfs_unlock_volumes(void); |
148 | void btrfs_lock_volumes(void); | |
0b86a832 | 149 | #endif |