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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>
Miao Xieb2117a32011-01-05 10:07:28 +000023#include <linux/sort.h>
Chris Mason8b712842008-06-11 16:50:36 -040024#include "async-thread.h"
Chris Masoncea9e442008-04-09 16:28:12 -040025
Miao Xieb2117a32011-01-05 10:07:28 +000026#define BTRFS_STRIPE_LEN (64 * 1024)
27
Chris Masonf2984462008-04-10 16:19:33 -040028struct buffer_head;
Chris Masonffbd5172009-04-20 15:50:09 -040029struct btrfs_pending_bios {
30 struct bio *head;
31 struct bio *tail;
32};
33
Chris Mason0b86a832008-03-24 15:01:56 -040034struct btrfs_device {
35 struct list_head dev_list;
Chris Masonb3075712008-04-22 09:22:07 -040036 struct list_head dev_alloc_list;
Yan Zheng2b820322008-11-17 21:11:30 -050037 struct btrfs_fs_devices *fs_devices;
Chris Mason0b86a832008-03-24 15:01:56 -040038 struct btrfs_root *dev_root;
Chris Masonffbd5172009-04-20 15:50:09 -040039
40 /* regular prio bios */
41 struct btrfs_pending_bios pending_bios;
42 /* WRITE_SYNC bios */
43 struct btrfs_pending_bios pending_sync_bios;
44
Chris Mason8b712842008-06-11 16:50:36 -040045 int running_pending;
Chris Masondfe25022008-05-13 13:46:40 -040046 u64 generation;
Chris Masonb3075712008-04-22 09:22:07 -040047
Yan Zheng2b820322008-11-17 21:11:30 -050048 int writeable;
Chris Masondfe25022008-05-13 13:46:40 -040049 int in_fs_metadata;
Chris Masoncd02dca2010-12-13 14:56:23 -050050 int missing;
Josef Bacikd5e20032011-08-04 14:52:27 +000051 int can_discard;
Chris Masonb3075712008-04-22 09:22:07 -040052
Chris Mason8790d502008-04-03 16:29:03 -040053 spinlock_t io_lock;
Chris Mason0b86a832008-03-24 15:01:56 -040054
55 struct block_device *bdev;
56
Tejun Heod4d77622010-11-13 11:55:18 +010057 /* the mode sent to blkdev_get */
Chris Mason15916de2008-11-19 21:17:22 -050058 fmode_t mode;
59
Chris Mason8a4b83c2008-03-24 15:02:07 -040060 char *name;
61
Chris Mason0b86a832008-03-24 15:01:56 -040062 /* the internal btrfs device id */
63 u64 devid;
64
65 /* size of the device */
66 u64 total_bytes;
67
Chris Balld6397ba2009-04-27 07:29:03 -040068 /* size of the disk */
69 u64 disk_total_bytes;
70
Chris Mason0b86a832008-03-24 15:01:56 -040071 /* bytes used */
72 u64 bytes_used;
73
74 /* optimal io alignment for this device */
75 u32 io_align;
76
77 /* optimal io width for this device */
78 u32 io_width;
79
80 /* minimal io size for this device */
81 u32 sector_size;
82
Chris Mason0b86a832008-03-24 15:01:56 -040083 /* type and info about this device */
84 u64 type;
85
Chris Mason0b86a832008-03-24 15:01:56 -040086 /* physical drive uuid (or lvm uuid) */
Chris Masone17cade2008-04-15 15:41:47 -040087 u8 uuid[BTRFS_UUID_SIZE];
Chris Mason8b712842008-06-11 16:50:36 -040088
Arne Jansena2de7332011-03-08 14:14:00 +010089 /* per-device scrub information */
90 struct scrub_dev *scrub_device;
91
Chris Mason8b712842008-06-11 16:50:36 -040092 struct btrfs_work work;
Xiao Guangrong1f781602011-04-20 10:09:16 +000093 struct rcu_head rcu;
94 struct work_struct rcu_work;
Arne Jansen90519d62011-05-23 14:30:00 +020095
96 /* readahead state */
97 spinlock_t reada_lock;
98 atomic_t reada_in_flight;
99 u64 reada_next;
100 struct reada_zone *reada_curr_zone;
101 struct radix_tree_root reada_zones;
102 struct radix_tree_root reada_extents;
Chris Mason387125f2011-11-18 15:07:51 -0500103
104 /* for sending down flush barriers */
105 struct bio *flush_bio;
106 struct completion flush_wait;
107 int nobarriers;
108
Chris Mason0b86a832008-03-24 15:01:56 -0400109};
110
Chris Mason8a4b83c2008-03-24 15:02:07 -0400111struct btrfs_fs_devices {
112 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
113
Wu Fengguangd4a78942009-04-02 16:46:06 -0400114 /* the device with this id has the most recent copy of the super */
Chris Mason8a4b83c2008-03-24 15:02:07 -0400115 u64 latest_devid;
116 u64 latest_trans;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400117 u64 num_devices;
Chris Masona0af4692008-05-13 16:03:06 -0400118 u64 open_devices;
Yan Zheng2b820322008-11-17 21:11:30 -0500119 u64 rw_devices;
Chris Masoncd02dca2010-12-13 14:56:23 -0500120 u64 missing_devices;
Yan Zheng2b820322008-11-17 21:11:30 -0500121 u64 total_rw_bytes;
Josef Bacikd5e20032011-08-04 14:52:27 +0000122 u64 num_can_discard;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400123 struct block_device *latest_bdev;
Chris Masone5e9a522009-06-10 15:17:02 -0400124
125 /* all of the devices in the FS, protected by a mutex
126 * so we can safely walk it to write out the supers without
127 * worrying about add/remove by the multi-device code
128 */
129 struct mutex device_list_mutex;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400130 struct list_head devices;
Chris Masonb3075712008-04-22 09:22:07 -0400131
132 /* devices not currently being allocated */
133 struct list_head alloc_list;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400134 struct list_head list;
Yan Zheng2b820322008-11-17 21:11:30 -0500135
136 struct btrfs_fs_devices *seed;
137 int seeding;
Yan Zheng2b820322008-11-17 21:11:30 -0500138
139 int opened;
Chris Masonc2898112009-06-10 09:51:32 -0400140
141 /* set when we find or add a device that doesn't have the
142 * nonrot flag set
143 */
144 int rotating;
Chris Mason8a4b83c2008-03-24 15:02:07 -0400145};
146
Chris Masoncea9e442008-04-09 16:28:12 -0400147struct btrfs_bio_stripe {
148 struct btrfs_device *dev;
149 u64 physical;
Li Dongyangfce3bb92011-03-24 10:24:26 +0000150 u64 length; /* only used for discard mappings */
Chris Masoncea9e442008-04-09 16:28:12 -0400151};
152
Jan Schmidta1d3c472011-08-04 17:15:33 +0200153struct btrfs_bio;
154typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
155
156struct btrfs_bio {
Chris Masoncea9e442008-04-09 16:28:12 -0400157 atomic_t stripes_pending;
158 bio_end_io_t *end_io;
Chris Mason7d2b4da2008-08-05 10:13:57 -0400159 struct bio *orig_bio;
Chris Masoncea9e442008-04-09 16:28:12 -0400160 void *private;
Chris Masona236aed2008-04-29 09:38:00 -0400161 atomic_t error;
162 int max_errors;
Chris Masoncea9e442008-04-09 16:28:12 -0400163 int num_stripes;
Jan Schmidta1d3c472011-08-04 17:15:33 +0200164 int mirror_num;
Chris Masoncea9e442008-04-09 16:28:12 -0400165 struct btrfs_bio_stripe stripes[];
166};
167
Miao Xieb2117a32011-01-05 10:07:28 +0000168struct btrfs_device_info {
169 struct btrfs_device *dev;
170 u64 dev_offset;
171 u64 max_avail;
Arne Jansen73c5de02011-04-12 12:07:57 +0200172 u64 total_avail;
Miao Xieb2117a32011-01-05 10:07:28 +0000173};
174
liubo1abe9b82011-03-24 11:18:59 +0000175struct map_lookup {
176 u64 type;
177 int io_align;
178 int io_width;
179 int stripe_len;
180 int sector_size;
181 int num_stripes;
182 int sub_stripes;
183 struct btrfs_bio_stripe stripes[];
184};
185
Arne Jansena2de7332011-03-08 14:14:00 +0100186#define map_lookup_size(n) (sizeof(struct map_lookup) + \
187 (sizeof(struct btrfs_bio_stripe) * (n)))
188
Miao Xie6d07bce2011-01-05 10:07:31 +0000189int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
190 u64 end, u64 *length);
191
Jan Schmidta1d3c472011-08-04 17:15:33 +0200192#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
Chris Masoncea9e442008-04-09 16:28:12 -0400193 (sizeof(struct btrfs_bio_stripe) * (n)))
194
Chris Mason0b86a832008-03-24 15:01:56 -0400195int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
196 struct btrfs_device *device,
Chris Masone17cade2008-04-15 15:41:47 -0400197 u64 chunk_tree, u64 chunk_objectid,
Yan Zheng2b820322008-11-17 21:11:30 -0500198 u64 chunk_offset, u64 start, u64 num_bytes);
Chris Masoncea9e442008-04-09 16:28:12 -0400199int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
200 u64 logical, u64 *length,
Jan Schmidta1d3c472011-08-04 17:15:33 +0200201 struct btrfs_bio **bbio_ret, int mirror_num);
Yan Zhenga512bbf2008-12-08 16:46:26 -0500202int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
203 u64 chunk_start, u64 physical, u64 devid,
204 u64 **logical, int *naddrs, int *stripe_len);
Yan Zhenge4404d62008-12-12 10:03:26 -0500205int btrfs_read_sys_array(struct btrfs_root *root);
Chris Mason0b86a832008-03-24 15:01:56 -0400206int btrfs_read_chunk_tree(struct btrfs_root *root);
207int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
Yan Zheng2b820322008-11-17 21:11:30 -0500208 struct btrfs_root *extent_root, u64 type);
Chris Mason0b86a832008-03-24 15:01:56 -0400209void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
210void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
Chris Masonf1885912008-04-09 16:28:12 -0400211int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
Chris Mason8b712842008-06-11 16:50:36 -0400212 int mirror_num, int async_submit);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400213int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
Christoph Hellwig97288f22008-12-02 06:36:09 -0500214 fmode_t flags, void *holder);
215int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
Chris Mason8a4b83c2008-03-24 15:02:07 -0400216 struct btrfs_fs_devices **fs_devices_ret);
217int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
Chris Masondfe25022008-05-13 13:46:40 -0400218int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400219int btrfs_add_device(struct btrfs_trans_handle *trans,
220 struct btrfs_root *root,
221 struct btrfs_device *device);
Chris Masona061fc82008-05-07 11:43:44 -0400222int btrfs_rm_device(struct btrfs_root *root, char *device_path);
Chris Mason8a4b83c2008-03-24 15:02:07 -0400223int btrfs_cleanup_fs_uuids(void);
Chris Masonf1885912008-04-09 16:28:12 -0400224int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
Chris Mason8f18cf12008-04-25 16:53:30 -0400225int btrfs_grow_device(struct btrfs_trans_handle *trans,
226 struct btrfs_device *device, u64 new_size);
227struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
Yan Zheng2b820322008-11-17 21:11:30 -0500228 u8 *uuid, u8 *fsid);
Chris Mason8f18cf12008-04-25 16:53:30 -0400229int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
Chris Mason788f20e2008-04-28 15:29:42 -0400230int btrfs_init_new_device(struct btrfs_root *root, char *path);
Chris Masonec44a352008-04-28 15:29:52 -0400231int btrfs_balance(struct btrfs_root *dev_root);
Yan Zheng2b820322008-11-17 21:11:30 -0500232int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
Josef Bacikba1bf482009-09-11 16:11:19 -0400233int find_free_dev_extent(struct btrfs_trans_handle *trans,
234 struct btrfs_device *device, u64 num_bytes,
235 u64 *start, u64 *max_avail);
Chris Mason0b86a832008-03-24 15:01:56 -0400236#endif