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1/*
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_
8790d502 21
cea9e445 22#include <linux/bio.h>
b2117a39 23#include <linux/sort.h>
8b712842 24#include "async-thread.h"
442a4f63 25#include "ioctl.h"
cea9e445 26
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27#define BTRFS_STRIPE_LEN (64 * 1024)
28
f2984462 29struct buffer_head;
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30struct btrfs_pending_bios {
31 struct bio *head;
32 struct bio *tail;
33};
34
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35struct btrfs_device {
36 struct list_head dev_list;
b3075717 37 struct list_head dev_alloc_list;
2b82032c 38 struct btrfs_fs_devices *fs_devices;
0b86a832 39 struct btrfs_root *dev_root;
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40
41 /* regular prio bios */
42 struct btrfs_pending_bios pending_bios;
43 /* WRITE_SYNC bios */
44 struct btrfs_pending_bios pending_sync_bios;
45
8b712842 46 int running_pending;
dfe25020 47 u64 generation;
b3075717 48
2b82032c 49 int writeable;
dfe25020 50 int in_fs_metadata;
cd02dca5 51 int missing;
d5e2003c 52 int can_discard;
63a212ab 53 int is_tgtdev_for_dev_replace;
b3075717 54
8790d502 55 spinlock_t io_lock;
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56
57 struct block_device *bdev;
58
d4d77629 59 /* the mode sent to blkdev_get */
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60 fmode_t mode;
61
606686ee 62 struct rcu_string *name;
8a4b83cc 63
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64 /* the internal btrfs device id */
65 u64 devid;
66
67 /* size of the device */
68 u64 total_bytes;
69
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70 /* size of the disk */
71 u64 disk_total_bytes;
72
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73 /* bytes used */
74 u64 bytes_used;
75
76 /* optimal io alignment for this device */
77 u32 io_align;
78
79 /* optimal io width for this device */
80 u32 io_width;
81
82 /* minimal io size for this device */
83 u32 sector_size;
84
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85 /* type and info about this device */
86 u64 type;
87
0b86a832 88 /* physical drive uuid (or lvm uuid) */
e17cade2 89 u8 uuid[BTRFS_UUID_SIZE];
8b712842 90
a2de733c 91 /* per-device scrub information */
d9d181c1 92 struct scrub_ctx *scrub_device;
a2de733c 93
8b712842 94 struct btrfs_work work;
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95 struct rcu_head rcu;
96 struct work_struct rcu_work;
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97
98 /* readahead state */
99 spinlock_t reada_lock;
100 atomic_t reada_in_flight;
101 u64 reada_next;
102 struct reada_zone *reada_curr_zone;
103 struct radix_tree_root reada_zones;
104 struct radix_tree_root reada_extents;
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105
106 /* for sending down flush barriers */
107 struct bio *flush_bio;
108 struct completion flush_wait;
109 int nobarriers;
110
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111 /* disk I/O failure stats. For detailed description refer to
112 * enum btrfs_dev_stat_values in ioctl.h */
733f4fbb 113 int dev_stats_valid;
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114 int dev_stats_dirty; /* counters need to be written to disk */
115 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
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116};
117
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118struct btrfs_fs_devices {
119 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
120
d4a78947 121 /* the device with this id has the most recent copy of the super */
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122 u64 latest_devid;
123 u64 latest_trans;
8a4b83cc 124 u64 num_devices;
a0af469b 125 u64 open_devices;
2b82032c 126 u64 rw_devices;
cd02dca5 127 u64 missing_devices;
2b82032c 128 u64 total_rw_bytes;
d5e2003c 129 u64 num_can_discard;
02db0844 130 u64 total_devices;
8a4b83cc 131 struct block_device *latest_bdev;
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132
133 /* all of the devices in the FS, protected by a mutex
134 * so we can safely walk it to write out the supers without
135 * worrying about add/remove by the multi-device code
136 */
137 struct mutex device_list_mutex;
8a4b83cc 138 struct list_head devices;
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139
140 /* devices not currently being allocated */
141 struct list_head alloc_list;
8a4b83cc 142 struct list_head list;
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143
144 struct btrfs_fs_devices *seed;
145 int seeding;
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146
147 int opened;
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148
149 /* set when we find or add a device that doesn't have the
150 * nonrot flag set
151 */
152 int rotating;
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153};
154
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155struct btrfs_bio_stripe {
156 struct btrfs_device *dev;
157 u64 physical;
fce3bb9a 158 u64 length; /* only used for discard mappings */
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159};
160
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161struct btrfs_bio;
162typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
163
164struct btrfs_bio {
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165 atomic_t stripes_pending;
166 bio_end_io_t *end_io;
7d2b4daa 167 struct bio *orig_bio;
cea9e445 168 void *private;
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169 atomic_t error;
170 int max_errors;
cea9e445 171 int num_stripes;
a1d3c478 172 int mirror_num;
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173 struct btrfs_bio_stripe stripes[];
174};
175
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176struct btrfs_device_info {
177 struct btrfs_device *dev;
178 u64 dev_offset;
179 u64 max_avail;
73c5de00 180 u64 total_avail;
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181};
182
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183struct btrfs_raid_attr {
184 int sub_stripes; /* sub_stripes info for map */
185 int dev_stripes; /* stripes per dev */
186 int devs_max; /* max devs to use */
187 int devs_min; /* min devs needed */
188 int devs_increment; /* ndevs has to be a multiple of this */
189 int ncopies; /* how many copies to data has */
190};
191
1abe9b8a 192struct map_lookup {
193 u64 type;
194 int io_align;
195 int io_width;
196 int stripe_len;
197 int sector_size;
198 int num_stripes;
199 int sub_stripes;
200 struct btrfs_bio_stripe stripes[];
201};
202
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203#define map_lookup_size(n) (sizeof(struct map_lookup) + \
204 (sizeof(struct btrfs_bio_stripe) * (n)))
205
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206/*
207 * Restriper's general type filter
208 */
209#define BTRFS_BALANCE_DATA (1ULL << 0)
210#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
211#define BTRFS_BALANCE_METADATA (1ULL << 2)
212
213#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
214 BTRFS_BALANCE_SYSTEM | \
215 BTRFS_BALANCE_METADATA)
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216
217#define BTRFS_BALANCE_FORCE (1ULL << 3)
59641015 218#define BTRFS_BALANCE_RESUME (1ULL << 4)
e4d8ec0f 219
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220/*
221 * Balance filters
222 */
223#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
5ce5b3c0 224#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
409d404b 225#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
94e60d5a 226#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
ea67176a 227#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
f43ffb60 228
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229/*
230 * Profile changing flags. When SOFT is set we won't relocate chunk if
231 * it already has the target profile (even though it may be
232 * half-filled).
233 */
e4d8ec0f 234#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
cfa4c961 235#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
e4d8ec0f 236
c9e9f97b 237struct btrfs_balance_args;
19a39dce 238struct btrfs_balance_progress;
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239struct btrfs_balance_control {
240 struct btrfs_fs_info *fs_info;
241
242 struct btrfs_balance_args data;
243 struct btrfs_balance_args meta;
244 struct btrfs_balance_args sys;
245
246 u64 flags;
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247
248 struct btrfs_balance_progress stat;
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249};
250
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251int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
252 u64 end, u64 *length);
253
a1d3c478 254#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
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255 (sizeof(struct btrfs_bio_stripe) * (n)))
256
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257int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
258 struct btrfs_device *device,
e17cade2 259 u64 chunk_tree, u64 chunk_objectid,
2b82032c 260 u64 chunk_offset, u64 start, u64 num_bytes);
3ec706c8 261int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
cea9e445 262 u64 logical, u64 *length,
a1d3c478 263 struct btrfs_bio **bbio_ret, int mirror_num);
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264int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
265 u64 chunk_start, u64 physical, u64 devid,
266 u64 **logical, int *naddrs, int *stripe_len);
e4404d6e 267int btrfs_read_sys_array(struct btrfs_root *root);
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268int btrfs_read_chunk_tree(struct btrfs_root *root);
269int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
2b82032c 270 struct btrfs_root *extent_root, u64 type);
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271void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
272void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
f188591e 273int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
8b712842 274 int mirror_num, int async_submit);
8a4b83cc 275int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
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276 fmode_t flags, void *holder);
277int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
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278 struct btrfs_fs_devices **fs_devices_ret);
279int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
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280void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
281 struct btrfs_fs_devices *fs_devices, int step);
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282int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
283 char *device_path,
284 struct btrfs_device **device);
285int btrfs_find_device_by_path(struct btrfs_root *root, char *device_path,
286 struct btrfs_device **device);
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287int btrfs_add_device(struct btrfs_trans_handle *trans,
288 struct btrfs_root *root,
289 struct btrfs_device *device);
a061fc8d 290int btrfs_rm_device(struct btrfs_root *root, char *device_path);
143bede5 291void btrfs_cleanup_fs_uuids(void);
5d964051 292int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
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293int btrfs_grow_device(struct btrfs_trans_handle *trans,
294 struct btrfs_device *device, u64 new_size);
aa1b8cd4 295struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
2b82032c 296 u8 *uuid, u8 *fsid);
8f18cf13 297int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
788f20eb 298int btrfs_init_new_device(struct btrfs_root *root, char *path);
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299int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
300 struct btrfs_device **device_out);
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301int btrfs_balance(struct btrfs_balance_control *bctl,
302 struct btrfs_ioctl_balance_args *bargs);
2b6ba629 303int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
68310a5e 304int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
837d5b6e 305int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
a7e99c69 306int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
2b82032c 307int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
125ccb0a 308int find_free_dev_extent(struct btrfs_device *device, u64 num_bytes,
ba1bf481 309 u64 *start, u64 *max_avail);
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310void btrfs_dev_stat_print_on_error(struct btrfs_device *device);
311void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
c11d2c23 312int btrfs_get_dev_stats(struct btrfs_root *root,
b27f7c0c 313 struct btrfs_ioctl_get_dev_stats *stats);
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314int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
315int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
316 struct btrfs_fs_info *fs_info);
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317void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
318 struct btrfs_device *srcdev);
319void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
320 struct btrfs_device *tgtdev);
321void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
322 struct btrfs_device *tgtdev);
a8a6dab7 323int btrfs_scratch_superblock(struct btrfs_device *device);
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324
325static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
326 int index)
327{
328 atomic_inc(dev->dev_stat_values + index);
329 dev->dev_stats_dirty = 1;
330}
331
332static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
333 int index)
334{
335 return atomic_read(dev->dev_stat_values + index);
336}
337
338static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
339 int index)
340{
341 int ret;
342
343 ret = atomic_xchg(dev->dev_stat_values + index, 0);
344 dev->dev_stats_dirty = 1;
345 return ret;
346}
347
348static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
349 int index, unsigned long val)
350{
351 atomic_set(dev->dev_stat_values + index, val);
352 dev->dev_stats_dirty = 1;
353}
354
355static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
356 int index)
357{
358 btrfs_dev_stat_set(dev, index, 0);
359}
0b86a832 360#endif