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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; |
2b82032c | 29 | struct btrfs_fs_devices *fs_devices; |
0b86a832 | 30 | struct btrfs_root *dev_root; |
f2984462 | 31 | struct buffer_head *pending_io; |
8b712842 CM |
32 | struct bio *pending_bios; |
33 | struct bio *pending_bio_tail; | |
34 | int running_pending; | |
dfe25020 | 35 | u64 generation; |
b3075717 | 36 | |
f2984462 | 37 | int barriers; |
2b82032c | 38 | int writeable; |
dfe25020 | 39 | int in_fs_metadata; |
b3075717 | 40 | |
8790d502 | 41 | spinlock_t io_lock; |
0b86a832 CM |
42 | |
43 | struct block_device *bdev; | |
44 | ||
15916de8 CM |
45 | /* the mode sent to open_bdev_exclusive */ |
46 | fmode_t mode; | |
47 | ||
8a4b83cc CM |
48 | char *name; |
49 | ||
0b86a832 CM |
50 | /* the internal btrfs device id */ |
51 | u64 devid; | |
52 | ||
53 | /* size of the device */ | |
54 | u64 total_bytes; | |
55 | ||
56 | /* bytes used */ | |
57 | u64 bytes_used; | |
58 | ||
59 | /* optimal io alignment for this device */ | |
60 | u32 io_align; | |
61 | ||
62 | /* optimal io width for this device */ | |
63 | u32 io_width; | |
64 | ||
65 | /* minimal io size for this device */ | |
66 | u32 sector_size; | |
67 | ||
0b86a832 CM |
68 | /* type and info about this device */ |
69 | u64 type; | |
70 | ||
0b86a832 | 71 | /* physical drive uuid (or lvm uuid) */ |
e17cade2 | 72 | u8 uuid[BTRFS_UUID_SIZE]; |
8b712842 CM |
73 | |
74 | struct btrfs_work work; | |
0b86a832 CM |
75 | }; |
76 | ||
8a4b83cc CM |
77 | struct btrfs_fs_devices { |
78 | u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ | |
79 | ||
80 | /* the device with this id has the most recent coyp of the super */ | |
81 | u64 latest_devid; | |
82 | u64 latest_trans; | |
8a4b83cc | 83 | u64 num_devices; |
a0af469b | 84 | u64 open_devices; |
2b82032c YZ |
85 | u64 rw_devices; |
86 | u64 total_rw_bytes; | |
8a4b83cc | 87 | struct block_device *latest_bdev; |
b3075717 | 88 | /* all of the devices in the FS */ |
8a4b83cc | 89 | struct list_head devices; |
b3075717 CM |
90 | |
91 | /* devices not currently being allocated */ | |
92 | struct list_head alloc_list; | |
8a4b83cc | 93 | struct list_head list; |
2b82032c YZ |
94 | |
95 | struct btrfs_fs_devices *seed; | |
96 | int seeding; | |
97 | int sprouted; | |
98 | ||
99 | int opened; | |
8a4b83cc CM |
100 | }; |
101 | ||
cea9e445 CM |
102 | struct btrfs_bio_stripe { |
103 | struct btrfs_device *dev; | |
104 | u64 physical; | |
105 | }; | |
106 | ||
107 | struct btrfs_multi_bio { | |
108 | atomic_t stripes_pending; | |
109 | bio_end_io_t *end_io; | |
7d2b4daa | 110 | struct bio *orig_bio; |
cea9e445 | 111 | void *private; |
a236aed1 CM |
112 | atomic_t error; |
113 | int max_errors; | |
cea9e445 CM |
114 | int num_stripes; |
115 | struct btrfs_bio_stripe stripes[]; | |
116 | }; | |
117 | ||
118 | #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \ | |
119 | (sizeof(struct btrfs_bio_stripe) * (n))) | |
120 | ||
0b86a832 CM |
121 | int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans, |
122 | struct btrfs_device *device, | |
e17cade2 | 123 | u64 chunk_tree, u64 chunk_objectid, |
2b82032c | 124 | u64 chunk_offset, u64 start, u64 num_bytes); |
cea9e445 CM |
125 | int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw, |
126 | u64 logical, u64 *length, | |
f188591e | 127 | struct btrfs_multi_bio **multi_ret, int mirror_num); |
0b86a832 CM |
128 | int btrfs_read_sys_array(struct btrfs_root *root); |
129 | int btrfs_read_chunk_tree(struct btrfs_root *root); | |
130 | int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, | |
2b82032c | 131 | struct btrfs_root *extent_root, u64 type); |
0b86a832 CM |
132 | void btrfs_mapping_init(struct btrfs_mapping_tree *tree); |
133 | void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree); | |
f188591e | 134 | int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio, |
8b712842 | 135 | int mirror_num, int async_submit); |
0d81ba5d | 136 | int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf); |
8a4b83cc | 137 | int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, |
97288f2c CH |
138 | fmode_t flags, void *holder); |
139 | int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, | |
8a4b83cc CM |
140 | struct btrfs_fs_devices **fs_devices_ret); |
141 | int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); | |
dfe25020 | 142 | int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices); |
8a4b83cc CM |
143 | int btrfs_add_device(struct btrfs_trans_handle *trans, |
144 | struct btrfs_root *root, | |
145 | struct btrfs_device *device); | |
a061fc8d | 146 | int btrfs_rm_device(struct btrfs_root *root, char *device_path); |
8a4b83cc | 147 | int btrfs_cleanup_fs_uuids(void); |
f188591e | 148 | int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len); |
f2d8d74d CM |
149 | int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree, |
150 | u64 logical, struct page *page); | |
8f18cf13 CM |
151 | int btrfs_grow_device(struct btrfs_trans_handle *trans, |
152 | struct btrfs_device *device, u64 new_size); | |
153 | struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid, | |
2b82032c | 154 | u8 *uuid, u8 *fsid); |
8f18cf13 | 155 | int btrfs_shrink_device(struct btrfs_device *device, u64 new_size); |
788f20eb | 156 | int btrfs_init_new_device(struct btrfs_root *root, char *path); |
ec44a35c | 157 | int btrfs_balance(struct btrfs_root *dev_root); |
a061fc8d CM |
158 | void btrfs_unlock_volumes(void); |
159 | void btrfs_lock_volumes(void); | |
2b82032c | 160 | int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset); |
0b86a832 | 161 | #endif |