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Chris Mason0b86a832008-03-24 15:01:56 -04001/*
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_
Chris Mason8790d502008-04-03 16:29:03 -040021
Chris Masoncea9e442008-04-09 16:28:12 -040022#include <linux/bio.h>
23
Chris Masonf2984462008-04-10 16:19:33 -040024struct buffer_head;
Chris Mason0b86a832008-03-24 15:01:56 -040025struct btrfs_device {
26 struct list_head dev_list;
Chris Masonb3075712008-04-22 09:22:07 -040027 struct list_head dev_alloc_list;
Chris Mason0b86a832008-03-24 15:01:56 -040028 struct btrfs_root *dev_root;
Chris Masonf2984462008-04-10 16:19:33 -040029 struct buffer_head *pending_io;
Chris Masonb3075712008-04-22 09:22:07 -040030
Chris Masonf2984462008-04-10 16:19:33 -040031 int barriers;
Chris Masonb3075712008-04-22 09:22:07 -040032
Chris Mason8790d502008-04-03 16:29:03 -040033 spinlock_t io_lock;
Chris Mason0b86a832008-03-24 15:01:56 -040034
35 struct block_device *bdev;
36
Chris Mason8790d502008-04-03 16:29:03 -040037 u64 total_ios;
38
Chris Mason8a4b83c2008-03-24 15:02:07 -040039 char *name;
40
Chris Mason0b86a832008-03-24 15:01:56 -040041 /* 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
Chris Mason0b86a832008-03-24 15:01:56 -040059 /* type and info about this device */
60 u64 type;
61
Chris Mason0b86a832008-03-24 15:01:56 -040062 /* physical drive uuid (or lvm uuid) */
Chris Masone17cade2008-04-15 15:41:47 -040063 u8 uuid[BTRFS_UUID_SIZE];
Chris Mason0b86a832008-03-24 15:01:56 -040064};
65
Chris Mason8a4b83c2008-03-24 15:02:07 -040066struct 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;
Chris Masonb3075712008-04-22 09:22:07 -040076 /* all of the devices in the FS */
Chris Mason8a4b83c2008-03-24 15:02:07 -040077 struct list_head devices;
Chris Masonb3075712008-04-22 09:22:07 -040078
79 /* devices not currently being allocated */
80 struct list_head alloc_list;
Chris Mason8a4b83c2008-03-24 15:02:07 -040081 struct list_head list;
82};
83
Chris Masoncea9e442008-04-09 16:28:12 -040084struct btrfs_bio_stripe {
85 struct btrfs_device *dev;
86 u64 physical;
87};
88
89struct btrfs_multi_bio {
90 atomic_t stripes_pending;
91 bio_end_io_t *end_io;
92 void *private;
93 int error;
94 int num_stripes;
95 struct btrfs_bio_stripe stripes[];
96};
97
98#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
99 (sizeof(struct btrfs_bio_stripe) * (n)))
100
Chris Mason0b86a832008-03-24 15:01:56 -0400101int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
102 struct btrfs_device *device,
Chris Masone17cade2008-04-15 15:41:47 -0400103 u64 chunk_tree, u64 chunk_objectid,
104 u64 chunk_offset,
105 u64 num_bytes, u64 *start);
Chris Masoncea9e442008-04-09 16:28:12 -0400106int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
107 u64 logical, u64 *length,
Chris Masonf1885912008-04-09 16:28:12 -0400108 struct btrfs_multi_bio **multi_ret, int mirror_num);
Chris Mason0b86a832008-03-24 15:01:56 -0400109int btrfs_read_sys_array(struct btrfs_root *root);
110int btrfs_read_chunk_tree(struct btrfs_root *root);
111int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
112 struct btrfs_root *extent_root, u64 *start,
Chris Mason6324fbf2008-03-24 15:01:59 -0400113 u64 *num_bytes, u64 type);
Chris Mason0b86a832008-03-24 15:01:56 -0400114void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
115void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
Chris Masonf1885912008-04-09 16:28:12 -0400116int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
117 int mirror_num);
Chris Mason0d81ba52008-03-24 15:02:07 -0400118int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400119int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
120 int flags, void *holder);
121int btrfs_scan_one_device(const char *path, int flags, void *holder,
122 struct btrfs_fs_devices **fs_devices_ret);
123int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
124int btrfs_add_device(struct btrfs_trans_handle *trans,
125 struct btrfs_root *root,
126 struct btrfs_device *device);
127int btrfs_cleanup_fs_uuids(void);
Chris Masonf1885912008-04-09 16:28:12 -0400128int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
Chris Masonf2d8d742008-04-21 10:03:05 -0400129int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
130 u64 logical, struct page *page);
Chris Mason0b86a832008-03-24 15:01:56 -0400131#endif