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)
30 struct btrfs_pending_bios {
36 struct list_head dev_list;
37 struct list_head dev_alloc_list;
38 struct btrfs_fs_devices *fs_devices;
40 struct btrfs_root *dev_root;
42 struct rcu_string *name;
46 spinlock_t io_lock ____cacheline_aligned;
48 /* regular prio bios */
49 struct btrfs_pending_bios pending_bios;
51 struct btrfs_pending_bios pending_sync_bios;
53 struct block_device *bdev;
55 /* the mode sent to blkdev_get */
62 int is_tgtdev_for_dev_replace;
64 /* the internal btrfs device id */
67 /* size of the device in memory */
70 /* size of the device on disk */
76 /* optimal io alignment for this device */
79 /* optimal io width for this device */
81 /* type and info about this device */
84 /* minimal io size for this device */
87 /* physical drive uuid (or lvm uuid) */
88 u8 uuid[BTRFS_UUID_SIZE];
91 * size of the device on the current transaction
93 * This variant is update when committing the transaction,
94 * and protected by device_list_mutex
96 u64 commit_total_bytes;
98 /* bytes used on the current transaction */
99 u64 commit_bytes_used;
101 * used to manage the device which is resized
103 * It is protected by chunk_lock.
105 struct list_head resized_list;
107 /* for sending down flush barriers */
109 struct bio *flush_bio;
110 struct completion flush_wait;
112 /* per-device scrub information */
113 struct scrub_ctx *scrub_device;
115 struct btrfs_work work;
117 struct work_struct rcu_work;
119 /* readahead state */
120 spinlock_t reada_lock;
121 atomic_t reada_in_flight;
123 struct reada_zone *reada_curr_zone;
124 struct radix_tree_root reada_zones;
125 struct radix_tree_root reada_extents;
127 /* disk I/O failure stats. For detailed description refer to
128 * enum btrfs_dev_stat_values in ioctl.h */
131 /* Counter to record the change of device stats */
132 atomic_t dev_stats_ccnt;
133 atomic_t dev_stat_values[BTRFS_DEV_STAT_VALUES_MAX];
136 struct btrfs_fs_devices {
137 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
145 struct block_device *latest_bdev;
147 /* all of the devices in the FS, protected by a mutex
148 * so we can safely walk it to write out the supers without
149 * worrying about add/remove by the multi-device code.
150 * Scrubbing super can kick off supers writing by holding
153 struct mutex device_list_mutex;
154 struct list_head devices;
156 struct list_head resized_devices;
157 /* devices not currently being allocated */
158 struct list_head alloc_list;
159 struct list_head list;
161 struct btrfs_fs_devices *seed;
166 /* set when we find or add a device that doesn't have the
172 #define BTRFS_BIO_INLINE_CSUM_SIZE 64
175 * we need the mirror number and stripe index to be passed around
176 * the call chain while we are processing end_io (especially errors).
177 * Really, what we need is a btrfs_bio structure that has this info
178 * and is properly sized with its stripe array, but we're not there
179 * quite yet. We have our own btrfs bioset, and all of the bios
180 * we allocate are actually btrfs_io_bios. We'll cram as much of
181 * struct btrfs_bio as we can into this over time.
183 typedef void (btrfs_io_bio_end_io_t) (struct btrfs_io_bio *bio, int err);
184 struct btrfs_io_bio {
185 unsigned long mirror_num;
186 unsigned long stripe_index;
188 u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
190 btrfs_io_bio_end_io_t *end_io;
194 static inline struct btrfs_io_bio *btrfs_io_bio(struct bio *bio)
196 return container_of(bio, struct btrfs_io_bio, bio);
199 struct btrfs_bio_stripe {
200 struct btrfs_device *dev;
202 u64 length; /* only used for discard mappings */
206 typedef void (btrfs_bio_end_io_t) (struct btrfs_bio *bio, int err);
208 #define BTRFS_BIO_ORIG_BIO_SUBMITTED 0x1
211 atomic_t stripes_pending;
212 struct btrfs_fs_info *fs_info;
213 bio_end_io_t *end_io;
214 struct bio *orig_bio;
221 struct btrfs_bio_stripe stripes[];
224 struct btrfs_device_info {
225 struct btrfs_device *dev;
231 struct btrfs_raid_attr {
232 int sub_stripes; /* sub_stripes info for map */
233 int dev_stripes; /* stripes per dev */
234 int devs_max; /* max devs to use */
235 int devs_min; /* min devs needed */
236 int devs_increment; /* ndevs has to be a multiple of this */
237 int ncopies; /* how many copies to data has */
248 struct btrfs_bio_stripe stripes[];
251 #define map_lookup_size(n) (sizeof(struct map_lookup) + \
252 (sizeof(struct btrfs_bio_stripe) * (n)))
255 * Restriper's general type filter
257 #define BTRFS_BALANCE_DATA (1ULL << 0)
258 #define BTRFS_BALANCE_SYSTEM (1ULL << 1)
259 #define BTRFS_BALANCE_METADATA (1ULL << 2)
261 #define BTRFS_BALANCE_TYPE_MASK (BTRFS_BALANCE_DATA | \
262 BTRFS_BALANCE_SYSTEM | \
263 BTRFS_BALANCE_METADATA)
265 #define BTRFS_BALANCE_FORCE (1ULL << 3)
266 #define BTRFS_BALANCE_RESUME (1ULL << 4)
271 #define BTRFS_BALANCE_ARGS_PROFILES (1ULL << 0)
272 #define BTRFS_BALANCE_ARGS_USAGE (1ULL << 1)
273 #define BTRFS_BALANCE_ARGS_DEVID (1ULL << 2)
274 #define BTRFS_BALANCE_ARGS_DRANGE (1ULL << 3)
275 #define BTRFS_BALANCE_ARGS_VRANGE (1ULL << 4)
276 #define BTRFS_BALANCE_ARGS_LIMIT (1ULL << 5)
279 * Profile changing flags. When SOFT is set we won't relocate chunk if
280 * it already has the target profile (even though it may be
283 #define BTRFS_BALANCE_ARGS_CONVERT (1ULL << 8)
284 #define BTRFS_BALANCE_ARGS_SOFT (1ULL << 9)
286 struct btrfs_balance_args;
287 struct btrfs_balance_progress;
288 struct btrfs_balance_control {
289 struct btrfs_fs_info *fs_info;
291 struct btrfs_balance_args data;
292 struct btrfs_balance_args meta;
293 struct btrfs_balance_args sys;
297 struct btrfs_balance_progress stat;
300 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
301 u64 end, u64 *length);
303 #define btrfs_bio_size(n) (sizeof(struct btrfs_bio) + \
304 (sizeof(struct btrfs_bio_stripe) * (n)))
306 int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
307 u64 logical, u64 *length,
308 struct btrfs_bio **bbio_ret, int mirror_num);
309 int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
310 u64 chunk_start, u64 physical, u64 devid,
311 u64 **logical, int *naddrs, int *stripe_len);
312 int btrfs_read_sys_array(struct btrfs_root *root);
313 int btrfs_read_chunk_tree(struct btrfs_root *root);
314 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
315 struct btrfs_root *extent_root, u64 type);
316 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
317 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
318 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
319 int mirror_num, int async_submit);
320 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
321 fmode_t flags, void *holder);
322 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
323 struct btrfs_fs_devices **fs_devices_ret);
324 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
325 void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
326 struct btrfs_fs_devices *fs_devices, int step);
327 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
329 struct btrfs_device **device);
330 struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
333 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
334 void btrfs_cleanup_fs_uuids(void);
335 int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
336 int btrfs_grow_device(struct btrfs_trans_handle *trans,
337 struct btrfs_device *device, u64 new_size);
338 struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
340 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
341 int btrfs_init_new_device(struct btrfs_root *root, char *path);
342 int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path,
343 struct btrfs_device *srcdev,
344 struct btrfs_device **device_out);
345 int btrfs_balance(struct btrfs_balance_control *bctl,
346 struct btrfs_ioctl_balance_args *bargs);
347 int btrfs_resume_balance_async(struct btrfs_fs_info *fs_info);
348 int btrfs_recover_balance(struct btrfs_fs_info *fs_info);
349 int btrfs_pause_balance(struct btrfs_fs_info *fs_info);
350 int btrfs_cancel_balance(struct btrfs_fs_info *fs_info);
351 int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info);
352 int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info);
353 int btrfs_chunk_readonly(struct btrfs_root *root, u64 chunk_offset);
354 int find_free_dev_extent(struct btrfs_trans_handle *trans,
355 struct btrfs_device *device, u64 num_bytes,
356 u64 *start, u64 *max_avail);
357 void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);
358 int btrfs_get_dev_stats(struct btrfs_root *root,
359 struct btrfs_ioctl_get_dev_stats *stats);
360 void btrfs_init_devices_late(struct btrfs_fs_info *fs_info);
361 int btrfs_init_dev_stats(struct btrfs_fs_info *fs_info);
362 int btrfs_run_dev_stats(struct btrfs_trans_handle *trans,
363 struct btrfs_fs_info *fs_info);
364 void btrfs_rm_dev_replace_srcdev(struct btrfs_fs_info *fs_info,
365 struct btrfs_device *srcdev);
366 void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
367 struct btrfs_device *tgtdev);
368 void btrfs_init_dev_replace_tgtdev_for_resume(struct btrfs_fs_info *fs_info,
369 struct btrfs_device *tgtdev);
370 int btrfs_scratch_superblock(struct btrfs_device *device);
371 int btrfs_is_parity_mirror(struct btrfs_mapping_tree *map_tree,
372 u64 logical, u64 len, int mirror_num);
373 unsigned long btrfs_full_stripe_len(struct btrfs_root *root,
374 struct btrfs_mapping_tree *map_tree,
376 int btrfs_finish_chunk_alloc(struct btrfs_trans_handle *trans,
377 struct btrfs_root *extent_root,
378 u64 chunk_offset, u64 chunk_size);
380 static inline int btrfs_dev_stats_dirty(struct btrfs_device *dev)
382 return atomic_read(&dev->dev_stats_ccnt);
385 static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,
388 atomic_inc(dev->dev_stat_values + index);
389 smp_mb__before_atomic();
390 atomic_inc(&dev->dev_stats_ccnt);
393 static inline int btrfs_dev_stat_read(struct btrfs_device *dev,
396 return atomic_read(dev->dev_stat_values + index);
399 static inline int btrfs_dev_stat_read_and_reset(struct btrfs_device *dev,
404 ret = atomic_xchg(dev->dev_stat_values + index, 0);
405 smp_mb__before_atomic();
406 atomic_inc(&dev->dev_stats_ccnt);
410 static inline void btrfs_dev_stat_set(struct btrfs_device *dev,
411 int index, unsigned long val)
413 atomic_set(dev->dev_stat_values + index, val);
414 smp_mb__before_atomic();
415 atomic_inc(&dev->dev_stats_ccnt);
418 static inline void btrfs_dev_stat_reset(struct btrfs_device *dev,
421 btrfs_dev_stat_set(dev, index, 0);
424 void btrfs_update_commit_device_size(struct btrfs_fs_info *fs_info);
425 void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
426 struct btrfs_transaction *transaction);