Linux 3.12.28
[linux/fpc-iii.git] / fs / btrfs / volumes.h
blobb72f540c8b295d1be0b3642d695ee0b8b75ebed1
1 /*
2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #ifndef __BTRFS_VOLUMES_
20 #define __BTRFS_VOLUMES_
22 #include <linux/bio.h>
23 #include <linux/sort.h>
24 #include <linux/btrfs.h>
25 #include "async-thread.h"
27 #define BTRFS_STRIPE_LEN (64 * 1024)
29 struct buffer_head;
30 struct btrfs_pending_bios {
31 struct bio *head;
32 struct bio *tail;
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;
41 /* regular prio bios */
42 struct btrfs_pending_bios pending_bios;
43 /* WRITE_SYNC bios */
44 struct btrfs_pending_bios pending_sync_bios;
46 int running_pending;
47 u64 generation;
49 int writeable;
50 int in_fs_metadata;
51 int missing;
52 int can_discard;
53 int is_tgtdev_for_dev_replace;
55 spinlock_t io_lock;
57 struct block_device *bdev;
59 /* the mode sent to blkdev_get */
60 fmode_t mode;
62 struct rcu_string *name;
64 /* the internal btrfs device id */
65 u64 devid;
67 /* size of the device */
68 u64 total_bytes;
70 /* size of the disk */
71 u64 disk_total_bytes;
73 /* bytes used */
74 u64 bytes_used;
76 /* optimal io alignment for this device */
77 u32 io_align;
79 /* optimal io width for this device */
80 u32 io_width;
82 /* minimal io size for this device */
83 u32 sector_size;
85 /* type and info about this device */
86 u64 type;
88 /* physical drive uuid (or lvm uuid) */
89 u8 uuid[BTRFS_UUID_SIZE];
91 /* per-device scrub information */
92 struct scrub_ctx *scrub_device;
94 struct btrfs_work work;
95 struct rcu_head rcu;
96 struct work_struct rcu_work;
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;
106 /* for sending down flush barriers */
107 struct bio *flush_bio;
108 struct completion flush_wait;
109 int nobarriers;
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];
118 struct btrfs_fs_devices {
119 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
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;
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
137 struct mutex device_list_mutex;
138 struct list_head devices;
140 /* devices not currently being allocated */
141 struct list_head alloc_list;
142 struct list_head list;
144 struct btrfs_fs_devices *seed;
145 int seeding;
147 int opened;
149 /* set when we find or add a device that doesn't have the
150 * nonrot flag set
152 int rotating;
155 #define BTRFS_BIO_INLINE_CSUM_SIZE 64
158 * we need the mirror number and stripe index to be passed around
159 * the call chain while we are processing end_io (especially errors).
160 * Really, what we need is a btrfs_bio structure that has this info
161 * and is properly sized with its stripe array, but we're not there
162 * quite yet. We have our own btrfs bioset, and all of the bios
163 * we allocate are actually btrfs_io_bios. We'll cram as much of
164 * struct btrfs_bio as we can into this over time.
166 typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
167 struct btrfs_io_bio {
168 unsigned long mirror_num;
169 unsigned long stripe_index;
170 u8 *csum;
171 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
172 u8 *csum_allocated;
173 btrfs_io_bio_end_io_t *end_io;
174 struct bio bio;
177 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
179 return container_of(bio, struct btrfs_io_bio, bio);
182 struct btrfs_bio_stripe {
183 struct btrfs_device *dev;
184 u64 physical;
185 u64 length; /* only used for discard mappings */
188 struct btrfs_bio;
189 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
191 struct btrfs_bio {
192 atomic_t stripes_pending;
193 bio_end_io_t *end_io;
194 struct bio *orig_bio;
195 void *private;
196 atomic_t error;
197 int max_errors;
198 int num_stripes;
199 int mirror_num;
200 struct btrfs_bio_stripe stripes[];
203 struct btrfs_device_info {
204 struct btrfs_device *dev;
205 u64 dev_offset;
206 u64 max_avail;
207 u64 total_avail;
210 struct btrfs_raid_attr {
211 int sub_stripes; /* sub_stripes info for map */
212 int dev_stripes; /* stripes per dev */
213 int devs_max; /* max devs to use */
214 int devs_min; /* min devs needed */
215 int devs_increment; /* ndevs has to be a multiple of this */
216 int ncopies; /* how many copies to data has */
219 struct map_lookup {
220 u64 type;
221 int io_align;
222 int io_width;
223 int stripe_len;
224 int sector_size;
225 int num_stripes;
226 int sub_stripes;
227 struct btrfs_bio_stripe stripes[];
230 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
231 (sizeof(struct btrfs_bio_stripe) * (n)))
234 * Restriper's general type filter
236 #define BTRFS_BALANCE_DATA (1ULL << 0)
237 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
238 #define BTRFS_BALANCE_METADATA (1ULL << 2)
240 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
241 BTRFS_BALANCE_SYSTEM | \
242 BTRFS_BALANCE_METADATA)
244 #define BTRFS_BALANCE_FORCE (1ULL << 3)
245 #define BTRFS_BALANCE_RESUME (1ULL << 4)
248 * Balance filters
250 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
251 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
252 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
253 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
254 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
257 * Profile changing flags. When SOFT is set we won't relocate chunk if
258 * it already has the target profile (even though it may be
259 * half-filled).
261 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
262 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
264 struct btrfs_balance_args;
265 struct btrfs_balance_progress;
266 struct btrfs_balance_control {
267 struct btrfs_fs_info *fs_info;
269 struct btrfs_balance_args data;
270 struct btrfs_balance_args meta;
271 struct btrfs_balance_args sys;
273 u64 flags;
275 struct btrfs_balance_progress stat;
278 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
279 u64 end, u64 *length);
281 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
282 (sizeof(struct btrfs_bio_stripe) * (n)))
284 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
285 u64 logical, u64 *length,
286 struct btrfs_bio **bbio_ret, int mirror_num);
287 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
288 u64 chunk_start, u64 physical, u64 devid,
289 u64 **logical, int *naddrs, int *stripe_len);
290 int btrfs_read_sys_array(struct btrfs_root *root);
291 int btrfs_read_chunk_tree(struct btrfs_root *root);
292 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
293 struct btrfs_root *extent_root, u64 type);
294 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
295 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
296 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
297 int mirror_num, int async_submit);
298 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
299 fmode_t flags, void *holder);
300 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
301 struct btrfs_fs_devices **fs_devices_ret);
302 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
303 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
304 struct btrfs_fs_devices *fs_devices, int step);
305 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
306 char *device_path,
307 struct btrfs_device **device);
308 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
309 const u64 *devid,
310 const u8 *uuid);
311 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
312 void btrfs_cleanup_fs_uuids(void);
313 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
314 int btrfs_grow_device(struct btrfs_trans_handle *trans,
315 struct btrfs_device *device, u64 new_size);
316 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
317 u8 *uuid, u8 *fsid);
318 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
319 int btrfs_init_new_device(struct btrfs_root *root, char *path);
320 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
321 struct btrfs_device **device_out);
322 int btrfs_balance(struct btrfs_balance_control *bctl,
323 struct btrfs_ioctl_balance_args *bargs);
324 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
325 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
326 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
327 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
328 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
329 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
330 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
331 int find_free_dev_extent(struct btrfs_trans_handle *trans,
332 struct btrfs_device *device, u64 num_bytes,
333 u64 *start, u64 *max_avail);
334 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
335 int btrfs_get_dev_stats(struct btrfs_root *root,
336 struct btrfs_ioctl_get_dev_stats *stats);
337 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
338 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
339 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
340 struct btrfs_fs_info *fs_info);
341 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
342 struct btrfs_device *srcdev);
343 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
344 struct btrfs_device *tgtdev);
345 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
346 struct btrfs_device *tgtdev);
347 int btrfs_scratch_superblock(struct btrfs_device *device);
348 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
349 u64 logical, u64 len, int mirror_num);
350 unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
351 struct btrfs_mapping_tree *map_tree,
352 u64 logical);
353 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
354 struct btrfs_root *extent_root,
355 u64 chunk_offset, u64 chunk_size);
356 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
357 int index)
359 atomic_inc(dev->dev_stat_values + index);
360 dev->dev_stats_dirty = 1;
363 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
364 int index)
366 return atomic_read(dev->dev_stat_values + index);
369 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
370 int index)
372 int ret;
374 ret = atomic_xchg(dev->dev_stat_values + index, 0);
375 dev->dev_stats_dirty = 1;
376 return ret;
379 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
380 int index, unsigned long val)
382 atomic_set(dev->dev_stat_values + index, val);
383 dev->dev_stats_dirty = 1;
386 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
387 int index)
389 btrfs_dev_stat_set(dev, index, 0);
391 #endif