volumes.h 6.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#ifndef __BTRFS_VOLUMES_
#define __BTRFS_VOLUMES_
21

22
#include <linux/bio.h>
23
#include <linux/sort.h>
24
#include "async-thread.h"
25

26 27
#define BTRFS_STRIPE_LEN	(64 * 1024)

28
struct buffer_head;
29 30 31 32 33
struct btrfs_pending_bios {
	struct bio *head;
	struct bio *tail;
};

34 35
struct btrfs_device {
	struct list_head dev_list;
36
	struct list_head dev_alloc_list;
Y
Yan Zheng 已提交
37
	struct btrfs_fs_devices *fs_devices;
38
	struct btrfs_root *dev_root;
39 40 41 42 43 44

	/* regular prio bios */
	struct btrfs_pending_bios pending_bios;
	/* WRITE_SYNC bios */
	struct btrfs_pending_bios pending_sync_bios;

45
	int running_pending;
46
	u64 generation;
47

Y
Yan Zheng 已提交
48
	int writeable;
49
	int in_fs_metadata;
50
	int missing;
51

52
	spinlock_t io_lock;
53 54 55

	struct block_device *bdev;

56
	/* the mode sent to blkdev_get */
57 58
	fmode_t mode;

59 60
	char *name;

61 62 63 64 65 66
	/* the internal btrfs device id */
	u64 devid;

	/* size of the device */
	u64 total_bytes;

67 68 69
	/* size of the disk */
	u64 disk_total_bytes;

70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85
	/* bytes used */
	u64 bytes_used;

	/* optimal io alignment for this device */
	u32 io_align;

	/* optimal io width for this device */
	u32 io_width;

	/* minimal io size for this device */
	u32 sector_size;

	/* type and info about this device */
	u64 type;

	/* physical drive uuid (or lvm uuid) */
86
	u8 uuid[BTRFS_UUID_SIZE];
87 88

	struct btrfs_work work;
89 90
};

91 92 93
struct btrfs_fs_devices {
	u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */

W
Wu Fengguang 已提交
94
	/* the device with this id has the most recent copy of the super */
95 96 97
	u64 latest_devid;
	u64 latest_trans;
	u64 num_devices;
98
	u64 open_devices;
Y
Yan Zheng 已提交
99
	u64 rw_devices;
100
	u64 missing_devices;
Y
Yan Zheng 已提交
101
	u64 total_rw_bytes;
102
	struct block_device *latest_bdev;
103 104 105 106 107 108

	/* all of the devices in the FS, protected by a mutex
	 * so we can safely walk it to write out the supers without
	 * worrying about add/remove by the multi-device code
	 */
	struct mutex device_list_mutex;
109
	struct list_head devices;
110 111 112

	/* devices not currently being allocated */
	struct list_head alloc_list;
113
	struct list_head list;
Y
Yan Zheng 已提交
114 115 116 117 118

	struct btrfs_fs_devices *seed;
	int seeding;

	int opened;
C
Chris Mason 已提交
119 120 121 122 123

	/* set when we find or add a device that doesn't have the
	 * nonrot flag set
	 */
	int rotating;
124 125
};

126 127 128
struct btrfs_bio_stripe {
	struct btrfs_device *dev;
	u64 physical;
129
	u64 length; /* only used for discard mappings */
130 131 132 133 134
};

struct btrfs_multi_bio {
	atomic_t stripes_pending;
	bio_end_io_t *end_io;
135
	struct bio *orig_bio;
136
	void *private;
137 138
	atomic_t error;
	int max_errors;
139 140 141 142
	int num_stripes;
	struct btrfs_bio_stripe stripes[];
};

143 144 145 146 147 148
struct btrfs_device_info {
	struct btrfs_device *dev;
	u64 dev_offset;
	u64 max_avail;
};

149 150 151 152 153 154 155 156 157 158 159
struct map_lookup {
	u64 type;
	int io_align;
	int io_width;
	int stripe_len;
	int sector_size;
	int num_stripes;
	int sub_stripes;
	struct btrfs_bio_stripe stripes[];
};

160 161 162 163 164 165 166 167 168 169 170 171 172 173 174
/* Used to sort the devices by max_avail(descending sort) */
int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2);

/*
 * sort the devices by max_avail, in which max free extent size of each device
 * is stored.(Descending Sort)
 */
static inline void btrfs_descending_sort_devices(
					struct btrfs_device_info *devices,
					size_t nr_devices)
{
	sort(devices, nr_devices, sizeof(struct btrfs_device_info),
	     btrfs_cmp_device_free_bytes, NULL);
}

175 176 177
int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
				   u64 end, u64 *length);

178 179 180
#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
			    (sizeof(struct btrfs_bio_stripe) * (n)))

181 182
int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
			   struct btrfs_device *device,
183
			   u64 chunk_tree, u64 chunk_objectid,
Y
Yan Zheng 已提交
184
			   u64 chunk_offset, u64 start, u64 num_bytes);
185 186
int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
		    u64 logical, u64 *length,
187
		    struct btrfs_multi_bio **multi_ret, int mirror_num);
Y
Yan Zheng 已提交
188 189 190
int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
		     u64 chunk_start, u64 physical, u64 devid,
		     u64 **logical, int *naddrs, int *stripe_len);
Y
Yan Zheng 已提交
191
int btrfs_read_sys_array(struct btrfs_root *root);
192 193
int btrfs_read_chunk_tree(struct btrfs_root *root);
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
Y
Yan Zheng 已提交
194
		      struct btrfs_root *extent_root, u64 type);
195 196
void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
197
int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
198
		  int mirror_num, int async_submit);
199
int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
200
int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
201 202
		       fmode_t flags, void *holder);
int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
203 204
			  struct btrfs_fs_devices **fs_devices_ret);
int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
205
int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
206 207 208
int btrfs_add_device(struct btrfs_trans_handle *trans,
		     struct btrfs_root *root,
		     struct btrfs_device *device);
209
int btrfs_rm_device(struct btrfs_root *root, char *device_path);
210
int btrfs_cleanup_fs_uuids(void);
211
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
212 213
int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
		      u64 logical, struct page *page);
214 215 216
int btrfs_grow_device(struct btrfs_trans_handle *trans,
		      struct btrfs_device *device, u64 new_size);
struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
Y
Yan Zheng 已提交
217
				       u8 *uuid, u8 *fsid);
218
int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
219
int btrfs_init_new_device(struct btrfs_root *root, char *path);
220
int btrfs_balance(struct btrfs_root *dev_root);
221 222
void btrfs_unlock_volumes(void);
void btrfs_lock_volumes(void);
Y
Yan Zheng 已提交
223
int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
224 225 226
int find_free_dev_extent(struct btrfs_trans_handle *trans,
			 struct btrfs_device *device, u64 num_bytes,
			 u64 *start, u64 *max_avail);
227
#endif