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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>
Chris Mason8b712842008-06-11 16:50:36 -040023#include "async-thread.h"
Chris Masoncea9e442008-04-09 16:28:12 -040024
Chris Masonf2984462008-04-10 16:19:33 -040025struct buffer_head;
Chris Mason0b86a832008-03-24 15:01:56 -040026struct btrfs_device {
27 struct list_head dev_list;
Chris Masonb3075712008-04-22 09:22:07 -040028 struct list_head dev_alloc_list;
Chris Mason0b86a832008-03-24 15:01:56 -040029 struct btrfs_root *dev_root;
Chris Masonf2984462008-04-10 16:19:33 -040030 struct buffer_head *pending_io;
Chris Mason8b712842008-06-11 16:50:36 -040031 struct bio *pending_bios;
32 struct bio *pending_bio_tail;
33 int running_pending;
Chris Masondfe25022008-05-13 13:46:40 -040034 u64 generation;
Chris Masonb3075712008-04-22 09:22:07 -040035
Chris Masonf2984462008-04-10 16:19:33 -040036 int barriers;
Chris Masondfe25022008-05-13 13:46:40 -040037 int in_fs_metadata;
Chris Masonb3075712008-04-22 09:22:07 -040038
Chris Mason8790d502008-04-03 16:29:03 -040039 spinlock_t io_lock;
Chris Mason0b86a832008-03-24 15:01:56 -040040
41 struct block_device *bdev;
42
Chris Mason8a4b83c2008-03-24 15:02:07 -040043 char *name;
44
Chris Mason0b86a832008-03-24 15:01:56 -040045 /* 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
Chris Mason0b86a832008-03-24 15:01:56 -040063 /* type and info about this device */
64 u64 type;
65
Chris Mason0b86a832008-03-24 15:01:56 -040066 /* physical drive uuid (or lvm uuid) */
Chris Masone17cade2008-04-15 15:41:47 -040067 u8 uuid[BTRFS_UUID_SIZE];
Chris Mason8b712842008-06-11 16:50:36 -040068
69 struct btrfs_work work;
Chris Mason0b86a832008-03-24 15:01:56 -040070};
71
Chris Mason8a4b83c2008-03-24 15:02:07 -040072struct 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;
Chris Mason8a4b83c2008-03-24 15:02:07 -040078 u64 num_devices;
Chris Masona0af4692008-05-13 16:03:06 -040079 u64 open_devices;
Chris Mason8a4b83c2008-03-24 15:02:07 -040080 struct block_device *latest_bdev;
Chris Masonb3075712008-04-22 09:22:07 -040081 /* all of the devices in the FS */
Chris Mason8a4b83c2008-03-24 15:02:07 -040082 struct list_head devices;
Chris Masonb3075712008-04-22 09:22:07 -040083
84 /* devices not currently being allocated */
85 struct list_head alloc_list;
Chris Mason8a4b83c2008-03-24 15:02:07 -040086 struct list_head list;
Chris Masona0af4692008-05-13 16:03:06 -040087 int mounted;
Chris Mason8a4b83c2008-03-24 15:02:07 -040088};
89
Chris Masoncea9e442008-04-09 16:28:12 -040090struct btrfs_bio_stripe {
91 struct btrfs_device *dev;
92 u64 physical;
93};
94
95struct btrfs_multi_bio {
96 atomic_t stripes_pending;
97 bio_end_io_t *end_io;
Chris Mason7d2b4da2008-08-05 10:13:57 -040098 struct bio *orig_bio;
Chris Masoncea9e442008-04-09 16:28:12 -040099 void *private;
Chris Masona236aed2008-04-29 09:38:00 -0400100 atomic_t error;
101 int max_errors;
Chris Masoncea9e442008-04-09 16:28:12 -0400102 int num_stripes;
103 struct btrfs_bio_stripe stripes[];
104};
105
106#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
107 (sizeof(struct btrfs_bio_stripe) * (n)))
108
Chris Mason0b86a832008-03-24 15:01:56 -0400109int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
110 struct btrfs_device *device,
Chris Masone17cade2008-04-15 15:41:47 -0400111 u64 chunk_tree, u64 chunk_objectid,
112 u64 chunk_offset,
113 u64 num_bytes, u64 *start);
Chris Masoncea9e442008-04-09 16:28:12 -0400114int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
115 u64 logical, u64 *length,
Chris Masonf1885912008-04-09 16:28:12 -0400116 struct btrfs_multi_bio **multi_ret, int mirror_num);
Chris Mason0b86a832008-03-24 15:01:56 -0400117int btrfs_read_sys_array(struct btrfs_root *root);
118int btrfs_read_chunk_tree(struct btrfs_root *root);
119int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
120 struct btrfs_root *extent_root, u64 *start,
Chris Mason6324fbf2008-03-24 15:01:59 -0400121 u64 *num_bytes, u64 type);
Chris Mason0b86a832008-03-24 15:01:56 -0400122void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
123void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
Chris Masonf1885912008-04-09 16:28:12 -0400124int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
Chris Mason8b712842008-06-11 16:50:36 -0400125 int mirror_num, int async_submit);
Chris Mason0d81ba52008-03-24 15:02:07 -0400126int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400127int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
128 int flags, void *holder);
129int btrfs_scan_one_device(const char *path, int flags, void *holder,
130 struct btrfs_fs_devices **fs_devices_ret);
131int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
Chris Masondfe25022008-05-13 13:46:40 -0400132int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400133int btrfs_add_device(struct btrfs_trans_handle *trans,
134 struct btrfs_root *root,
135 struct btrfs_device *device);
Chris Masona061fc82008-05-07 11:43:44 -0400136int btrfs_rm_device(struct btrfs_root *root, char *device_path);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400137int btrfs_cleanup_fs_uuids(void);
Chris Masonf1885912008-04-09 16:28:12 -0400138int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
Chris Masonf2d8d742008-04-21 10:03:05 -0400139int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
140 u64 logical, struct page *page);
Chris Mason8f18cf12008-04-25 16:53:30 -0400141int btrfs_grow_device(struct btrfs_trans_handle *trans,
142 struct btrfs_device *device, u64 new_size);
143struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
144 u8 *uuid);
145int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
Chris Mason788f20e2008-04-28 15:29:42 -0400146int btrfs_init_new_device(struct btrfs_root *root, char *path);
Chris Masonec44a352008-04-28 15:29:52 -0400147int btrfs_balance(struct btrfs_root *dev_root);
Chris Masona061fc82008-05-07 11:43:44 -0400148void btrfs_unlock_volumes(void);
149void btrfs_lock_volumes(void);
Chris Mason0b86a832008-03-24 15:01:56 -0400150#endif