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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;
Yan Zheng2b820322008-11-17 21:11:30 -050029 struct btrfs_fs_devices *fs_devices;
Chris Mason0b86a832008-03-24 15:01:56 -040030 struct btrfs_root *dev_root;
Chris Masonf2984462008-04-10 16:19:33 -040031 struct buffer_head *pending_io;
Chris Mason8b712842008-06-11 16:50:36 -040032 struct bio *pending_bios;
33 struct bio *pending_bio_tail;
34 int running_pending;
Chris Masondfe25022008-05-13 13:46:40 -040035 u64 generation;
Chris Masonb3075712008-04-22 09:22:07 -040036
Chris Masonf2984462008-04-10 16:19:33 -040037 int barriers;
Yan Zheng2b820322008-11-17 21:11:30 -050038 int writeable;
Chris Masondfe25022008-05-13 13:46:40 -040039 int in_fs_metadata;
Chris Masonb3075712008-04-22 09:22:07 -040040
Chris Mason8790d502008-04-03 16:29:03 -040041 spinlock_t io_lock;
Chris Mason0b86a832008-03-24 15:01:56 -040042
43 struct block_device *bdev;
44
Chris Mason15916de2008-11-19 21:17:22 -050045 /* the mode sent to open_bdev_exclusive */
46 fmode_t mode;
47
Chris Mason8a4b83c2008-03-24 15:02:07 -040048 char *name;
49
Chris Mason0b86a832008-03-24 15:01:56 -040050 /* 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
Chris Mason0b86a832008-03-24 15:01:56 -040068 /* type and info about this device */
69 u64 type;
70
Chris Mason0b86a832008-03-24 15:01:56 -040071 /* physical drive uuid (or lvm uuid) */
Chris Masone17cade2008-04-15 15:41:47 -040072 u8 uuid[BTRFS_UUID_SIZE];
Chris Mason8b712842008-06-11 16:50:36 -040073
74 struct btrfs_work work;
Chris Mason0b86a832008-03-24 15:01:56 -040075};
76
Chris Mason8a4b83c2008-03-24 15:02:07 -040077struct 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;
Chris Mason8a4b83c2008-03-24 15:02:07 -040083 u64 num_devices;
Chris Masona0af4692008-05-13 16:03:06 -040084 u64 open_devices;
Yan Zheng2b820322008-11-17 21:11:30 -050085 u64 rw_devices;
86 u64 total_rw_bytes;
Chris Mason8a4b83c2008-03-24 15:02:07 -040087 struct block_device *latest_bdev;
Chris Masonb3075712008-04-22 09:22:07 -040088 /* all of the devices in the FS */
Chris Mason8a4b83c2008-03-24 15:02:07 -040089 struct list_head devices;
Chris Masonb3075712008-04-22 09:22:07 -040090
91 /* devices not currently being allocated */
92 struct list_head alloc_list;
Chris Mason8a4b83c2008-03-24 15:02:07 -040093 struct list_head list;
Yan Zheng2b820322008-11-17 21:11:30 -050094
95 struct btrfs_fs_devices *seed;
96 int seeding;
97 int sprouted;
98
99 int opened;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400100};
101
Chris Masoncea9e442008-04-09 16:28:12 -0400102struct btrfs_bio_stripe {
103 struct btrfs_device *dev;
104 u64 physical;
105};
106
107struct btrfs_multi_bio {
108 atomic_t stripes_pending;
109 bio_end_io_t *end_io;
Chris Mason7d2b4da2008-08-05 10:13:57 -0400110 struct bio *orig_bio;
Chris Masoncea9e442008-04-09 16:28:12 -0400111 void *private;
Chris Masona236aed2008-04-29 09:38:00 -0400112 atomic_t error;
113 int max_errors;
Chris Masoncea9e442008-04-09 16:28:12 -0400114 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
Chris Mason0b86a832008-03-24 15:01:56 -0400121int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
122 struct btrfs_device *device,
Chris Masone17cade2008-04-15 15:41:47 -0400123 u64 chunk_tree, u64 chunk_objectid,
Yan Zheng2b820322008-11-17 21:11:30 -0500124 u64 chunk_offset, u64 start, u64 num_bytes);
Chris Masoncea9e442008-04-09 16:28:12 -0400125int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
126 u64 logical, u64 *length,
Chris Masonf1885912008-04-09 16:28:12 -0400127 struct btrfs_multi_bio **multi_ret, int mirror_num);
Chris Mason0b86a832008-03-24 15:01:56 -0400128int btrfs_read_sys_array(struct btrfs_root *root);
129int btrfs_read_chunk_tree(struct btrfs_root *root);
130int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
Yan Zheng2b820322008-11-17 21:11:30 -0500131 struct btrfs_root *extent_root, u64 type);
Chris Mason0b86a832008-03-24 15:01:56 -0400132void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
133void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
Chris Masonf1885912008-04-09 16:28:12 -0400134int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
Chris Mason8b712842008-06-11 16:50:36 -0400135 int mirror_num, int async_submit);
Chris Mason0d81ba52008-03-24 15:02:07 -0400136int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400137int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
Christoph Hellwig97288f22008-12-02 06:36:09 -0500138 fmode_t flags, void *holder);
139int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400140 struct btrfs_fs_devices **fs_devices_ret);
141int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
Chris Masondfe25022008-05-13 13:46:40 -0400142int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400143int btrfs_add_device(struct btrfs_trans_handle *trans,
144 struct btrfs_root *root,
145 struct btrfs_device *device);
Chris Masona061fc82008-05-07 11:43:44 -0400146int btrfs_rm_device(struct btrfs_root *root, char *device_path);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400147int btrfs_cleanup_fs_uuids(void);
Chris Masonf1885912008-04-09 16:28:12 -0400148int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
Chris Masonf2d8d742008-04-21 10:03:05 -0400149int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
150 u64 logical, struct page *page);
Chris Mason8f18cf12008-04-25 16:53:30 -0400151int btrfs_grow_device(struct btrfs_trans_handle *trans,
152 struct btrfs_device *device, u64 new_size);
153struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
Yan Zheng2b820322008-11-17 21:11:30 -0500154 u8 *uuid, u8 *fsid);
Chris Mason8f18cf12008-04-25 16:53:30 -0400155int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
Chris Mason788f20e2008-04-28 15:29:42 -0400156int btrfs_init_new_device(struct btrfs_root *root, char *path);
Chris Masonec44a352008-04-28 15:29:52 -0400157int btrfs_balance(struct btrfs_root *dev_root);
Chris Masona061fc82008-05-07 11:43:44 -0400158void btrfs_unlock_volumes(void);
159void btrfs_lock_volumes(void);
Yan Zheng2b820322008-11-17 21:11:30 -0500160int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
Chris Mason0b86a832008-03-24 15:01:56 -0400161#endif