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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_
21
22#include <linux/bio.h>
23#include <linux/sort.h>
24#include "async-thread.h"
25
26#define BTRFS_STRIPE_LEN (64 * 1024)
27
28struct buffer_head;
29struct btrfs_pending_bios {
30 struct bio *head;
31 struct bio *tail;
32};
33
34struct btrfs_device {
35 struct list_head dev_list;
36 struct list_head dev_alloc_list;
37 struct btrfs_fs_devices *fs_devices;
38 struct btrfs_root *dev_root;
39
40 /* regular prio bios */
41 struct btrfs_pending_bios pending_bios;
42 /* WRITE_SYNC bios */
43 struct btrfs_pending_bios pending_sync_bios;
44
45 int running_pending;
46 u64 generation;
47
48 int writeable;
49 int in_fs_metadata;
50 int missing;
51 int can_discard;
52
53 spinlock_t io_lock;
54
55 struct block_device *bdev;
56
57 /* the mode sent to blkdev_get */
58 fmode_t mode;
59
60 char *name;
61
62 /* the internal btrfs device id */
63 u64 devid;
64
65 /* size of the device */
66 u64 total_bytes;
67
68 /* size of the disk */
69 u64 disk_total_bytes;
70
71 /* 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
83 /* type and info about this device */
84 u64 type;
85
86 /* physical drive uuid (or lvm uuid) */
87 u8 uuid[BTRFS_UUID_SIZE];
88
89 /* per-device scrub information */
90 struct scrub_dev *scrub_device;
91
92 struct btrfs_work work;
93 struct rcu_head rcu;
94 struct work_struct rcu_work;
95};
96
97struct btrfs_fs_devices {
98 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
99
100 /* the device with this id has the most recent copy of the super */
101 u64 latest_devid;
102 u64 latest_trans;
103 u64 num_devices;
104 u64 open_devices;
105 u64 rw_devices;
106 u64 missing_devices;
107 u64 total_rw_bytes;
108 u64 num_can_discard;
109 struct block_device *latest_bdev;
110
111 /* all of the devices in the FS, protected by a mutex
112 * so we can safely walk it to write out the supers without
113 * worrying about add/remove by the multi-device code
114 */
115 struct mutex device_list_mutex;
116 struct list_head devices;
117
118 /* devices not currently being allocated */
119 struct list_head alloc_list;
120 struct list_head list;
121
122 struct btrfs_fs_devices *seed;
123 int seeding;
124
125 int opened;
126
127 /* set when we find or add a device that doesn't have the
128 * nonrot flag set
129 */
130 int rotating;
131};
132
133struct btrfs_bio_stripe {
134 struct btrfs_device *dev;
135 u64 physical;
136 u64 length; /* only used for discard mappings */
137};
138
139struct btrfs_multi_bio {
140 atomic_t stripes_pending;
141 bio_end_io_t *end_io;
142 struct bio *orig_bio;
143 void *private;
144 atomic_t error;
145 int max_errors;
146 int num_stripes;
147 struct btrfs_bio_stripe stripes[];
148};
149
150struct btrfs_device_info {
151 struct btrfs_device *dev;
152 u64 dev_offset;
153 u64 max_avail;
154 u64 total_avail;
155};
156
157struct map_lookup {
158 u64 type;
159 int io_align;
160 int io_width;
161 int stripe_len;
162 int sector_size;
163 int num_stripes;
164 int sub_stripes;
165 struct btrfs_bio_stripe stripes[];
166};
167
168#define map_lookup_size(n) (sizeof(struct map_lookup) + \
169 (sizeof(struct btrfs_bio_stripe) * (n)))
170
171int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
172 u64 end, u64 *length);
173
174#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
175 (sizeof(struct btrfs_bio_stripe) * (n)))
176
177int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
178 struct btrfs_device *device,
179 u64 chunk_tree, u64 chunk_objectid,
180 u64 chunk_offset, u64 start, u64 num_bytes);
181int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
182 u64 logical, u64 *length,
183 struct btrfs_multi_bio **multi_ret, int mirror_num);
184int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
185 u64 chunk_start, u64 physical, u64 devid,
186 u64 **logical, int *naddrs, int *stripe_len);
187int btrfs_read_sys_array(struct btrfs_root *root);
188int btrfs_read_chunk_tree(struct btrfs_root *root);
189int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
190 struct btrfs_root *extent_root, u64 type);
191void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
192void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
193int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
194 int mirror_num, int async_submit);
195int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
196 fmode_t flags, void *holder);
197int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
198 struct btrfs_fs_devices **fs_devices_ret);
199int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
200int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
201int btrfs_add_device(struct btrfs_trans_handle *trans,
202 struct btrfs_root *root,
203 struct btrfs_device *device);
204int btrfs_rm_device(struct btrfs_root *root, char *device_path);
205int btrfs_cleanup_fs_uuids(void);
206int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
207int btrfs_grow_device(struct btrfs_trans_handle *trans,
208 struct btrfs_device *device, u64 new_size);
209struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
210 u8 *uuid, u8 *fsid);
211int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
212int btrfs_init_new_device(struct btrfs_root *root, char *path);
213int btrfs_balance(struct btrfs_root *dev_root);
214int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
215int find_free_dev_extent(struct btrfs_trans_handle *trans,
216 struct btrfs_device *device, u64 num_bytes,
217 u64 *start, u64 *max_avail);
218#endif
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_
21
22#include <linux/bio.h>
23#include <linux/sort.h>
24#include <linux/btrfs.h>
25#include "async-thread.h"
26
27#define BTRFS_STRIPE_LEN (64 * 1024)
28
29struct buffer_head;
30struct btrfs_pending_bios {
31 struct bio *head;
32 struct bio *tail;
33};
34
35struct btrfs_device {
36 struct list_head dev_list;
37 struct list_head dev_alloc_list;
38 struct btrfs_fs_devices *fs_devices;
39 struct btrfs_root *dev_root;
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
46 u64 generation;
47 int running_pending;
48 int writeable;
49 int in_fs_metadata;
50 int missing;
51 int can_discard;
52 int is_tgtdev_for_dev_replace;
53
54 spinlock_t io_lock;
55 /* the mode sent to blkdev_get */
56 fmode_t mode;
57
58 struct block_device *bdev;
59
60
61 struct rcu_string *name;
62
63 /* the internal btrfs device id */
64 u64 devid;
65
66 /* size of the device */
67 u64 total_bytes;
68
69 /* size of the disk */
70 u64 disk_total_bytes;
71
72 /* bytes used */
73 u64 bytes_used;
74
75 /* optimal io alignment for this device */
76 u32 io_align;
77
78 /* optimal io width for this device */
79 u32 io_width;
80 /* type and info about this device */
81 u64 type;
82
83 /* minimal io size for this device */
84 u32 sector_size;
85
86
87 /* physical drive uuid (or lvm uuid) */
88 u8 uuid[BTRFS_UUID_SIZE];
89
90 /* for sending down flush barriers */
91 int nobarriers;
92 struct bio *flush_bio;
93 struct completion flush_wait;
94
95 /* per-device scrub information */
96 struct scrub_ctx *scrub_device;
97
98 struct btrfs_work work;
99 struct rcu_head rcu;
100 struct work_struct rcu_work;
101
102 /* readahead state */
103 spinlock_t reada_lock;
104 atomic_t reada_in_flight;
105 u64 reada_next;
106 struct reada_zone *reada_curr_zone;
107 struct radix_tree_root reada_zones;
108 struct radix_tree_root reada_extents;
109
110
111 /* disk I/O failure stats. For detailed description refer to
112 * enum btrfs_dev_stat_values in ioctl.h */
113 int dev_stats_valid;
114 int dev_stats_dirty; /* counters need to be written to disk */
115 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
116};
117
118struct btrfs_fs_devices {
119 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
120
121 /* the device with this id has the most recent copy of the super */
122 u64 latest_devid;
123 u64 latest_trans;
124 u64 num_devices;
125 u64 open_devices;
126 u64 rw_devices;
127 u64 missing_devices;
128 u64 total_rw_bytes;
129 u64 num_can_discard;
130 u64 total_devices;
131 struct block_device *latest_bdev;
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 * Scrubbing super can kick off supers writing by holding
137 * this mutex lock.
138 */
139 struct mutex device_list_mutex;
140 struct list_head devices;
141
142 /* devices not currently being allocated */
143 struct list_head alloc_list;
144 struct list_head list;
145
146 struct btrfs_fs_devices *seed;
147 int seeding;
148
149 int opened;
150
151 /* set when we find or add a device that doesn't have the
152 * nonrot flag set
153 */
154 int rotating;
155};
156
157#define BTRFS_BIO_INLINE_CSUM_SIZE 64
158
159/*
160 * we need the mirror number and stripe index to be passed around
161 * the call chain while we are processing end_io (especially errors).
162 * Really, what we need is a btrfs_bio structure that has this info
163 * and is properly sized with its stripe array, but we're not there
164 * quite yet. We have our own btrfs bioset, and all of the bios
165 * we allocate are actually btrfs_io_bios. We'll cram as much of
166 * struct btrfs_bio as we can into this over time.
167 */
168typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
169struct btrfs_io_bio {
170 unsigned long mirror_num;
171 unsigned long stripe_index;
172 u8 *csum;
173 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
174 u8 *csum_allocated;
175 btrfs_io_bio_end_io_t *end_io;
176 struct bio bio;
177};
178
179static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
180{
181 return container_of(bio, struct btrfs_io_bio, bio);
182}
183
184struct btrfs_bio_stripe {
185 struct btrfs_device *dev;
186 u64 physical;
187 u64 length; /* only used for discard mappings */
188};
189
190struct btrfs_bio;
191typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
192
193struct btrfs_bio {
194 atomic_t stripes_pending;
195 struct btrfs_fs_info *fs_info;
196 bio_end_io_t *end_io;
197 struct bio *orig_bio;
198 void *private;
199 atomic_t error;
200 int max_errors;
201 int num_stripes;
202 int mirror_num;
203 struct btrfs_bio_stripe stripes[];
204};
205
206struct btrfs_device_info {
207 struct btrfs_device *dev;
208 u64 dev_offset;
209 u64 max_avail;
210 u64 total_avail;
211};
212
213struct btrfs_raid_attr {
214 int sub_stripes; /* sub_stripes info for map */
215 int dev_stripes; /* stripes per dev */
216 int devs_max; /* max devs to use */
217 int devs_min; /* min devs needed */
218 int devs_increment; /* ndevs has to be a multiple of this */
219 int ncopies; /* how many copies to data has */
220};
221
222struct map_lookup {
223 u64 type;
224 int io_align;
225 int io_width;
226 int stripe_len;
227 int sector_size;
228 int num_stripes;
229 int sub_stripes;
230 struct btrfs_bio_stripe stripes[];
231};
232
233#define map_lookup_size(n) (sizeof(struct map_lookup) + \
234 (sizeof(struct btrfs_bio_stripe) * (n)))
235
236/*
237 * Restriper's general type filter
238 */
239#define BTRFS_BALANCE_DATA (1ULL << 0)
240#define BTRFS_BALANCE_SYSTEM (1ULL << 1)
241#define BTRFS_BALANCE_METADATA (1ULL << 2)
242
243#define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
244 BTRFS_BALANCE_SYSTEM | \
245 BTRFS_BALANCE_METADATA)
246
247#define BTRFS_BALANCE_FORCE (1ULL << 3)
248#define BTRFS_BALANCE_RESUME (1ULL << 4)
249
250/*
251 * Balance filters
252 */
253#define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
254#define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
255#define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
256#define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
257#define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
258
259/*
260 * Profile changing flags. When SOFT is set we won't relocate chunk if
261 * it already has the target profile (even though it may be
262 * half-filled).
263 */
264#define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
265#define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
266
267struct btrfs_balance_args;
268struct btrfs_balance_progress;
269struct btrfs_balance_control {
270 struct btrfs_fs_info *fs_info;
271
272 struct btrfs_balance_args data;
273 struct btrfs_balance_args meta;
274 struct btrfs_balance_args sys;
275
276 u64 flags;
277
278 struct btrfs_balance_progress stat;
279};
280
281int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
282 u64 end, u64 *length);
283
284#define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
285 (sizeof(struct btrfs_bio_stripe) * (n)))
286
287int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
288 u64 logical, u64 *length,
289 struct btrfs_bio **bbio_ret, int mirror_num);
290int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
291 u64 chunk_start, u64 physical, u64 devid,
292 u64 **logical, int *naddrs, int *stripe_len);
293int btrfs_read_sys_array(struct btrfs_root *root);
294int btrfs_read_chunk_tree(struct btrfs_root *root);
295int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
296 struct btrfs_root *extent_root, u64 type);
297void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
298void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
299int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
300 int mirror_num, int async_submit);
301int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
302 fmode_t flags, void *holder);
303int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
304 struct btrfs_fs_devices **fs_devices_ret);
305int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
306void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
307 struct btrfs_fs_devices *fs_devices, int step);
308int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
309 char *device_path,
310 struct btrfs_device **device);
311struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
312 const u64 *devid,
313 const u8 *uuid);
314int btrfs_rm_device(struct btrfs_root *root, char *device_path);
315void btrfs_cleanup_fs_uuids(void);
316int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
317int btrfs_grow_device(struct btrfs_trans_handle *trans,
318 struct btrfs_device *device, u64 new_size);
319struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
320 u8 *uuid, u8 *fsid);
321int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
322int btrfs_init_new_device(struct btrfs_root *root, char *path);
323int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
324 struct btrfs_device **device_out);
325int btrfs_balance(struct btrfs_balance_control *bctl,
326 struct btrfs_ioctl_balance_args *bargs);
327int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
328int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
329int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
330int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
331int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
332int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
333int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
334int find_free_dev_extent(struct btrfs_trans_handle *trans,
335 struct btrfs_device *device, u64 num_bytes,
336 u64 *start, u64 *max_avail);
337void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
338int btrfs_get_dev_stats(struct btrfs_root *root,
339 struct btrfs_ioctl_get_dev_stats *stats);
340void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
341int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
342int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
343 struct btrfs_fs_info *fs_info);
344void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
345 struct btrfs_device *srcdev);
346void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
347 struct btrfs_device *tgtdev);
348void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
349 struct btrfs_device *tgtdev);
350int btrfs_scratch_superblock(struct btrfs_device *device);
351int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
352 u64 logical, u64 len, int mirror_num);
353unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
354 struct btrfs_mapping_tree *map_tree,
355 u64 logical);
356int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
357 struct btrfs_root *extent_root,
358 u64 chunk_offset, u64 chunk_size);
359static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
360 int index)
361{
362 atomic_inc(dev->dev_stat_values + index);
363 dev->dev_stats_dirty = 1;
364}
365
366static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
367 int index)
368{
369 return atomic_read(dev->dev_stat_values + index);
370}
371
372static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
373 int index)
374{
375 int ret;
376
377 ret = atomic_xchg(dev->dev_stat_values + index, 0);
378 dev->dev_stats_dirty = 1;
379 return ret;
380}
381
382static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
383 int index, unsigned long val)
384{
385 atomic_set(dev->dev_stat_values + index, val);
386 dev->dev_stats_dirty = 1;
387}
388
389static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
390 int index)
391{
392 btrfs_dev_stat_set(dev, index, 0);
393}
394#endif