blob: 31b0fabdd2ea7da5489a4bffaa065c59e9282119 [file] [log] [blame]
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 Masonffbd5172009-04-20 15:50:09 -040026struct btrfs_pending_bios {
27 struct bio *head;
28 struct bio *tail;
29};
30
Chris Mason0b86a832008-03-24 15:01:56 -040031struct btrfs_device {
32 struct list_head dev_list;
Chris Masonb3075712008-04-22 09:22:07 -040033 struct list_head dev_alloc_list;
Yan Zheng2b820322008-11-17 21:11:30 -050034 struct btrfs_fs_devices *fs_devices;
Chris Mason0b86a832008-03-24 15:01:56 -040035 struct btrfs_root *dev_root;
Chris Masonffbd5172009-04-20 15:50:09 -040036
37 /* regular prio bios */
38 struct btrfs_pending_bios pending_bios;
39 /* WRITE_SYNC bios */
40 struct btrfs_pending_bios pending_sync_bios;
41
Chris Mason8b712842008-06-11 16:50:36 -040042 int running_pending;
Chris Masondfe25022008-05-13 13:46:40 -040043 u64 generation;
Chris Masonb3075712008-04-22 09:22:07 -040044
Chris Masonf2984462008-04-10 16:19:33 -040045 int barriers;
Yan Zheng2b820322008-11-17 21:11:30 -050046 int writeable;
Chris Masondfe25022008-05-13 13:46:40 -040047 int in_fs_metadata;
Chris Masonb3075712008-04-22 09:22:07 -040048
Chris Mason8790d502008-04-03 16:29:03 -040049 spinlock_t io_lock;
Chris Mason0b86a832008-03-24 15:01:56 -040050
51 struct block_device *bdev;
52
Chris Mason15916de2008-11-19 21:17:22 -050053 /* the mode sent to open_bdev_exclusive */
54 fmode_t mode;
55
Chris Mason8a4b83c2008-03-24 15:02:07 -040056 char *name;
57
Chris Mason0b86a832008-03-24 15:01:56 -040058 /* the internal btrfs device id */
59 u64 devid;
60
61 /* size of the device */
62 u64 total_bytes;
63
Chris Balld6397ba2009-04-27 07:29:03 -040064 /* size of the disk */
65 u64 disk_total_bytes;
66
Chris Mason0b86a832008-03-24 15:01:56 -040067 /* bytes used */
68 u64 bytes_used;
69
70 /* optimal io alignment for this device */
71 u32 io_align;
72
73 /* optimal io width for this device */
74 u32 io_width;
75
76 /* minimal io size for this device */
77 u32 sector_size;
78
Chris Mason0b86a832008-03-24 15:01:56 -040079 /* type and info about this device */
80 u64 type;
81
Chris Mason0b86a832008-03-24 15:01:56 -040082 /* physical drive uuid (or lvm uuid) */
Chris Masone17cade2008-04-15 15:41:47 -040083 u8 uuid[BTRFS_UUID_SIZE];
Chris Mason8b712842008-06-11 16:50:36 -040084
85 struct btrfs_work work;
Chris Mason0b86a832008-03-24 15:01:56 -040086};
87
Chris Mason8a4b83c2008-03-24 15:02:07 -040088struct btrfs_fs_devices {
89 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
90
Wu Fengguangd4a78942009-04-02 16:46:06 -040091 /* the device with this id has the most recent copy of the super */
Chris Mason8a4b83c2008-03-24 15:02:07 -040092 u64 latest_devid;
93 u64 latest_trans;
Chris Mason8a4b83c2008-03-24 15:02:07 -040094 u64 num_devices;
Chris Masona0af4692008-05-13 16:03:06 -040095 u64 open_devices;
Yan Zheng2b820322008-11-17 21:11:30 -050096 u64 rw_devices;
97 u64 total_rw_bytes;
Chris Mason8a4b83c2008-03-24 15:02:07 -040098 struct block_device *latest_bdev;
Chris Masone5e9a522009-06-10 15:17:02 -040099
100 /* all of the devices in the FS, protected by a mutex
101 * so we can safely walk it to write out the supers without
102 * worrying about add/remove by the multi-device code
103 */
104 struct mutex device_list_mutex;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400105 struct list_head devices;
Chris Masonb3075712008-04-22 09:22:07 -0400106
107 /* devices not currently being allocated */
108 struct list_head alloc_list;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400109 struct list_head list;
Yan Zheng2b820322008-11-17 21:11:30 -0500110
111 struct btrfs_fs_devices *seed;
112 int seeding;
Yan Zheng2b820322008-11-17 21:11:30 -0500113
114 int opened;
Chris Masonc2898112009-06-10 09:51:32 -0400115
116 /* set when we find or add a device that doesn't have the
117 * nonrot flag set
118 */
119 int rotating;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400120};
121
Chris Masoncea9e442008-04-09 16:28:12 -0400122struct btrfs_bio_stripe {
123 struct btrfs_device *dev;
124 u64 physical;
125};
126
127struct btrfs_multi_bio {
128 atomic_t stripes_pending;
129 bio_end_io_t *end_io;
Chris Mason7d2b4da2008-08-05 10:13:57 -0400130 struct bio *orig_bio;
Chris Masoncea9e442008-04-09 16:28:12 -0400131 void *private;
Chris Masona236aed2008-04-29 09:38:00 -0400132 atomic_t error;
133 int max_errors;
Chris Masoncea9e442008-04-09 16:28:12 -0400134 int num_stripes;
135 struct btrfs_bio_stripe stripes[];
136};
137
138#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
139 (sizeof(struct btrfs_bio_stripe) * (n)))
140
Chris Mason0b86a832008-03-24 15:01:56 -0400141int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
142 struct btrfs_device *device,
Chris Masone17cade2008-04-15 15:41:47 -0400143 u64 chunk_tree, u64 chunk_objectid,
Yan Zheng2b820322008-11-17 21:11:30 -0500144 u64 chunk_offset, u64 start, u64 num_bytes);
Chris Masoncea9e442008-04-09 16:28:12 -0400145int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
146 u64 logical, u64 *length,
Chris Masonf1885912008-04-09 16:28:12 -0400147 struct btrfs_multi_bio **multi_ret, int mirror_num);
Yan Zhenga512bbf2008-12-08 16:46:26 -0500148int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
149 u64 chunk_start, u64 physical, u64 devid,
150 u64 **logical, int *naddrs, int *stripe_len);
Yan Zhenge4404d62008-12-12 10:03:26 -0500151int btrfs_read_sys_array(struct btrfs_root *root);
Chris Mason0b86a832008-03-24 15:01:56 -0400152int btrfs_read_chunk_tree(struct btrfs_root *root);
153int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
Yan Zheng2b820322008-11-17 21:11:30 -0500154 struct btrfs_root *extent_root, u64 type);
Chris Mason0b86a832008-03-24 15:01:56 -0400155void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
156void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
Chris Masonf1885912008-04-09 16:28:12 -0400157int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
Chris Mason8b712842008-06-11 16:50:36 -0400158 int mirror_num, int async_submit);
Chris Mason0d81ba52008-03-24 15:02:07 -0400159int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400160int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
Christoph Hellwig97288f22008-12-02 06:36:09 -0500161 fmode_t flags, void *holder);
162int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400163 struct btrfs_fs_devices **fs_devices_ret);
164int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
Chris Masondfe25022008-05-13 13:46:40 -0400165int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400166int btrfs_add_device(struct btrfs_trans_handle *trans,
167 struct btrfs_root *root,
168 struct btrfs_device *device);
Chris Masona061fc82008-05-07 11:43:44 -0400169int btrfs_rm_device(struct btrfs_root *root, char *device_path);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400170int btrfs_cleanup_fs_uuids(void);
Chris Masonf1885912008-04-09 16:28:12 -0400171int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
Chris Masonf2d8d742008-04-21 10:03:05 -0400172int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
173 u64 logical, struct page *page);
Chris Mason8f18cf12008-04-25 16:53:30 -0400174int btrfs_grow_device(struct btrfs_trans_handle *trans,
175 struct btrfs_device *device, u64 new_size);
176struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
Yan Zheng2b820322008-11-17 21:11:30 -0500177 u8 *uuid, u8 *fsid);
Chris Mason8f18cf12008-04-25 16:53:30 -0400178int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
Chris Mason788f20e2008-04-28 15:29:42 -0400179int btrfs_init_new_device(struct btrfs_root *root, char *path);
Chris Masonec44a352008-04-28 15:29:52 -0400180int btrfs_balance(struct btrfs_root *dev_root);
Chris Masona061fc82008-05-07 11:43:44 -0400181void btrfs_unlock_volumes(void);
182void btrfs_lock_volumes(void);
Yan Zheng2b820322008-11-17 21:11:30 -0500183int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
Josef Bacikba1bf482009-09-11 16:11:19 -0400184int find_free_dev_extent(struct btrfs_trans_handle *trans,
185 struct btrfs_device *device, u64 num_bytes,
186 u64 *start, u64 *max_avail);
Chris Mason0b86a832008-03-24 15:01:56 -0400187#endif