Line data Source code
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 :
29 : struct buffer_head;
30 : struct btrfs_pending_bios {
31 : struct bio *head;
32 : struct bio *tail;
33 : };
34 :
35 : struct 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 :
118 : struct 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 : */
168 : typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
169 : struct 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 :
179 : static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
180 : {
181 : return container_of(bio, struct btrfs_io_bio, bio);
182 : }
183 :
184 : struct btrfs_bio_stripe {
185 : struct btrfs_device *dev;
186 : u64 physical;
187 : u64 length; /* only used for discard mappings */
188 : };
189 :
190 : struct btrfs_bio;
191 : typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
192 :
193 : #define BTRFS_BIO_ORIG_BIO_SUBMITTED 0x1
194 :
195 : struct btrfs_bio {
196 : atomic_t stripes_pending;
197 : struct btrfs_fs_info *fs_info;
198 : bio_end_io_t *end_io;
199 : struct bio *orig_bio;
200 : unsigned long flags;
201 : void *private;
202 : atomic_t error;
203 : int max_errors;
204 : int num_stripes;
205 : int mirror_num;
206 : struct btrfs_bio_stripe stripes[];
207 : };
208 :
209 : struct btrfs_device_info {
210 : struct btrfs_device *dev;
211 : u64 dev_offset;
212 : u64 max_avail;
213 : u64 total_avail;
214 : };
215 :
216 : struct btrfs_raid_attr {
217 : int sub_stripes; /* sub_stripes info for map */
218 : int dev_stripes; /* stripes per dev */
219 : int devs_max; /* max devs to use */
220 : int devs_min; /* min devs needed */
221 : int devs_increment; /* ndevs has to be a multiple of this */
222 : int ncopies; /* how many copies to data has */
223 : };
224 :
225 : struct map_lookup {
226 : u64 type;
227 : int io_align;
228 : int io_width;
229 : int stripe_len;
230 : int sector_size;
231 : int num_stripes;
232 : int sub_stripes;
233 : struct btrfs_bio_stripe stripes[];
234 : };
235 :
236 : #define map_lookup_size(n) (sizeof(struct map_lookup) + \
237 : (sizeof(struct btrfs_bio_stripe) * (n)))
238 :
239 : /*
240 : * Restriper's general type filter
241 : */
242 : #define BTRFS_BALANCE_DATA (1ULL << 0)
243 : #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
244 : #define BTRFS_BALANCE_METADATA (1ULL << 2)
245 :
246 : #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
247 : BTRFS_BALANCE_SYSTEM | \
248 : BTRFS_BALANCE_METADATA)
249 :
250 : #define BTRFS_BALANCE_FORCE (1ULL << 3)
251 : #define BTRFS_BALANCE_RESUME (1ULL << 4)
252 :
253 : /*
254 : * Balance filters
255 : */
256 : #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
257 : #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
258 : #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
259 : #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
260 : #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
261 : #define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
262 :
263 : /*
264 : * Profile changing flags. When SOFT is set we won't relocate chunk if
265 : * it already has the target profile (even though it may be
266 : * half-filled).
267 : */
268 : #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
269 : #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
270 :
271 : struct btrfs_balance_args;
272 : struct btrfs_balance_progress;
273 : struct btrfs_balance_control {
274 : struct btrfs_fs_info *fs_info;
275 :
276 : struct btrfs_balance_args data;
277 : struct btrfs_balance_args meta;
278 : struct btrfs_balance_args sys;
279 :
280 : u64 flags;
281 :
282 : struct btrfs_balance_progress stat;
283 : };
284 :
285 : int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
286 : u64 end, u64 *length);
287 :
288 : #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
289 : (sizeof(struct btrfs_bio_stripe) * (n)))
290 :
291 : int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
292 : u64 logical, u64 *length,
293 : struct btrfs_bio **bbio_ret, int mirror_num);
294 : int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
295 : u64 chunk_start, u64 physical, u64 devid,
296 : u64 **logical, int *naddrs, int *stripe_len);
297 : int btrfs_read_sys_array(struct btrfs_root *root);
298 : int btrfs_read_chunk_tree(struct btrfs_root *root);
299 : int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
300 : struct btrfs_root *extent_root, u64 type);
301 : void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
302 : void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
303 : int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
304 : int mirror_num, int async_submit);
305 : int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
306 : fmode_t flags, void *holder);
307 : int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
308 : struct btrfs_fs_devices **fs_devices_ret);
309 : int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
310 : void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
311 : struct btrfs_fs_devices *fs_devices, int step);
312 : int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
313 : char *device_path,
314 : struct btrfs_device **device);
315 : struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
316 : const u64 *devid,
317 : const u8 *uuid);
318 : int btrfs_rm_device(struct btrfs_root *root, char *device_path);
319 : void btrfs_cleanup_fs_uuids(void);
320 : int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
321 : int btrfs_grow_device(struct btrfs_trans_handle *trans,
322 : struct btrfs_device *device, u64 new_size);
323 : struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
324 : u8 *uuid, u8 *fsid);
325 : int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
326 : int btrfs_init_new_device(struct btrfs_root *root, char *path);
327 : int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
328 : struct btrfs_device **device_out);
329 : int btrfs_balance(struct btrfs_balance_control *bctl,
330 : struct btrfs_ioctl_balance_args *bargs);
331 : int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
332 : int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
333 : int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
334 : int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
335 : int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
336 : int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
337 : int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
338 : int find_free_dev_extent(struct btrfs_trans_handle *trans,
339 : struct btrfs_device *device, u64 num_bytes,
340 : u64 *start, u64 *max_avail);
341 : void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
342 : int btrfs_get_dev_stats(struct btrfs_root *root,
343 : struct btrfs_ioctl_get_dev_stats *stats);
344 : void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
345 : int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
346 : int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
347 : struct btrfs_fs_info *fs_info);
348 : void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
349 : struct btrfs_device *srcdev);
350 : void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
351 : struct btrfs_device *tgtdev);
352 : void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
353 : struct btrfs_device *tgtdev);
354 : int btrfs_scratch_superblock(struct btrfs_device *device);
355 : int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
356 : u64 logical, u64 len, int mirror_num);
357 : unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
358 : struct btrfs_mapping_tree *map_tree,
359 : u64 logical);
360 : int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
361 : struct btrfs_root *extent_root,
362 : u64 chunk_offset, u64 chunk_size);
363 : static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
364 : int index)
365 : {
366 0 : atomic_inc(dev->dev_stat_values + index);
367 0 : dev->dev_stats_dirty = 1;
368 : }
369 :
370 : static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
371 : int index)
372 : {
373 1785 : return atomic_read(dev->dev_stat_values + index);
374 : }
375 :
376 : static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
377 : int index)
378 : {
379 : int ret;
380 :
381 0 : ret = atomic_xchg(dev->dev_stat_values + index, 0);
382 0 : dev->dev_stats_dirty = 1;
383 : return ret;
384 : }
385 :
386 : static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
387 : int index, unsigned long val)
388 : {
389 1240 : atomic_set(dev->dev_stat_values + index, val);
390 1240 : dev->dev_stats_dirty = 1;
391 : }
392 :
393 : static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
394 : int index)
395 : {
396 : btrfs_dev_stat_set(dev, index, 0);
397 : }
398 : #endif
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