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diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
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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_
21
22#include <linux/bio.h>
23#include "async-thread.h"
24
25struct buffer_head;
26struct btrfs_device {
27 struct list_head dev_list;
28 struct list_head dev_alloc_list;
29 struct btrfs_fs_devices *fs_devices;
30 struct btrfs_root *dev_root;
31 struct bio *pending_bios;
32 struct bio *pending_bio_tail;
33 int running_pending;
34 u64 generation;
35
36 int barriers;
37 int writeable;
38 int in_fs_metadata;
39
40 spinlock_t io_lock;
41
42 struct block_device *bdev;
43
44 /* the mode sent to open_bdev_exclusive */
45 fmode_t mode;
46
47 char *name;
48
49 /* the internal btrfs device id */
50 u64 devid;
51
52 /* size of the device */
53 u64 total_bytes;
54
55 /* bytes used */
56 u64 bytes_used;
57
58 /* optimal io alignment for this device */
59 u32 io_align;
60
61 /* optimal io width for this device */
62 u32 io_width;
63
64 /* minimal io size for this device */
65 u32 sector_size;
66
67 /* type and info about this device */
68 u64 type;
69
70 /* physical drive uuid (or lvm uuid) */
71 u8 uuid[BTRFS_UUID_SIZE];
72
73 struct btrfs_work work;
74};
75
76struct btrfs_fs_devices {
77 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
78
79 /* the device with this id has the most recent coyp of the super */
80 u64 latest_devid;
81 u64 latest_trans;
82 u64 num_devices;
83 u64 open_devices;
84 u64 rw_devices;
85 u64 total_rw_bytes;
86 struct block_device *latest_bdev;
87 /* all of the devices in the FS */
88 struct list_head devices;
89
90 /* devices not currently being allocated */
91 struct list_head alloc_list;
92 struct list_head list;
93
94 struct btrfs_fs_devices *seed;
95 int seeding;
96
97 int opened;
98};
99
100struct btrfs_bio_stripe {
101 struct btrfs_device *dev;
102 u64 physical;
103};
104
105struct btrfs_multi_bio {
106 atomic_t stripes_pending;
107 bio_end_io_t *end_io;
108 struct bio *orig_bio;
109 void *private;
110 atomic_t error;
111 int max_errors;
112 int num_stripes;
113 struct btrfs_bio_stripe stripes[];
114};
115
116#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
117 (sizeof(struct btrfs_bio_stripe) * (n)))
118
119int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
120 struct btrfs_device *device,
121 u64 chunk_tree, u64 chunk_objectid,
122 u64 chunk_offset, u64 start, u64 num_bytes);
123int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
124 u64 logical, u64 *length,
125 struct btrfs_multi_bio **multi_ret, int mirror_num);
126int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
127 u64 chunk_start, u64 physical, u64 devid,
128 u64 **logical, int *naddrs, int *stripe_len);
129int btrfs_read_sys_array(struct btrfs_root *root);
130int btrfs_read_chunk_tree(struct btrfs_root *root);
131int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
132 struct btrfs_root *extent_root, u64 type);
133void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
134void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
135int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
136 int mirror_num, int async_submit);
137int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
138int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
139 fmode_t flags, void *holder);
140int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
141 struct btrfs_fs_devices **fs_devices_ret);
142int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
143int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
144int btrfs_add_device(struct btrfs_trans_handle *trans,
145 struct btrfs_root *root,
146 struct btrfs_device *device);
147int btrfs_rm_device(struct btrfs_root *root, char *device_path);
148int btrfs_cleanup_fs_uuids(void);
149int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
150int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
151 u64 logical, struct page *page);
152int btrfs_grow_device(struct btrfs_trans_handle *trans,
153 struct btrfs_device *device, u64 new_size);
154struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
155 u8 *uuid, u8 *fsid);
156int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
157int btrfs_init_new_device(struct btrfs_root *root, char *path);
158int btrfs_balance(struct btrfs_root *dev_root);
159void btrfs_unlock_volumes(void);
160void btrfs_lock_volumes(void);
161int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
162#endif
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