blob: 7e4f358a26a61a3430b3d82455218c8d1349c438 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 md_k.h : kernel internal structure of the Linux MD driver
3 Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
8 any later version.
9
10 You should have received a copy of the GNU General Public License
11 (for example /usr/src/linux/COPYING); if not, write to the Free
12 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
13*/
14
Christoph Hellwig63fe0812009-04-14 12:01:53 +100015#ifndef _MD_MD_H
16#define _MD_MD_H
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Christoph Hellwig63fe0812009-04-14 12:01:53 +100018#include <linux/blkdev.h>
19#include <linux/kobject.h>
20#include <linux/list.h>
21#include <linux/mm.h>
22#include <linux/mutex.h>
23#include <linux/timer.h>
24#include <linux/wait.h>
25#include <linux/workqueue.h>
David Howells93614012006-09-30 20:45:40 +020026
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#define MaxSector (~(sector_t)0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029typedef struct mddev_s mddev_t;
30typedef struct mdk_rdev_s mdk_rdev_t;
31
NeilBrown2ac87402010-06-01 19:37:29 +100032/* generic plugging support - like that provided with request_queue,
33 * but does not require a request_queue
34 */
35struct plug_handle {
36 void (*unplug_fn)(struct plug_handle *);
37 struct timer_list unplug_timer;
38 struct work_struct unplug_work;
39 unsigned long unplug_flag;
40};
41#define PLUGGED_FLAG 1
42void plugger_init(struct plug_handle *plug,
43 void (*unplug_fn)(struct plug_handle *));
44void plugger_set_plug(struct plug_handle *plug);
45int plugger_remove_plug(struct plug_handle *plug);
46static inline void plugger_flush(struct plug_handle *plug)
47{
48 del_timer_sync(&plug->unplug_timer);
49 cancel_work_sync(&plug->unplug_work);
50}
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 * MD's 'extended' device
54 */
55struct mdk_rdev_s
56{
57 struct list_head same_set; /* RAID devices within the same set */
58
Andre Nolldd8ac332009-03-31 14:33:13 +110059 sector_t sectors; /* Device size (in 512bytes sectors) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 mddev_t *mddev; /* RAID array if running */
NeilBrowneea1bf32009-03-31 14:27:02 +110061 int last_events; /* IO event timestamp */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63 struct block_device *bdev; /* block device handle */
64
65 struct page *sb_page;
66 int sb_loaded;
NeilBrown42543762006-06-26 00:27:57 -070067 __u64 sb_events;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 sector_t data_offset; /* start of data in array */
Andre Noll0f420352008-07-11 22:02:23 +100069 sector_t sb_start; /* offset of the super block (in 512byte sectors) */
NeilBrown0002b272005-09-09 16:23:53 -070070 int sb_size; /* bytes in the superblock */
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 int preferred_minor; /* autorun support */
72
NeilBrown86e6ffd2005-11-08 21:39:24 -080073 struct kobject kobj;
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 /* A device can be in one of three states based on two flags:
76 * Not working: faulty==1 in_sync==0
77 * Fully working: faulty==0 in_sync==1
78 * Working, but not
79 * in sync with array
80 * faulty==0 in_sync==0
81 *
82 * It can never have faulty==1, in_sync==1
83 * This reduces the burden of testing multiple flags in many cases
84 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070085
NeilBrownb2d444d2005-11-08 21:39:31 -080086 unsigned long flags;
87#define Faulty 1 /* device is known to have a fault */
88#define In_sync 2 /* device is in_sync with rest of array */
NeilBrown8ddf9ef2005-09-09 16:23:45 -070089#define WriteMostly 4 /* Avoid reading if at all possible */
NeilBrownc5d79ad2008-02-06 01:39:54 -080090#define AllReserved 6 /* If whole device is reserved for
91 * one array */
NeilBrownd0fae182008-03-04 14:29:31 -080092#define AutoDetected 7 /* added by auto-detect */
Dan Williams6bfe0b42008-04-30 00:52:32 -070093#define Blocked 8 /* An error occured on an externally
94 * managed array, don't allow writes
95 * until it is cleared */
96 wait_queue_head_t blocked_wait;
NeilBrown8ddf9ef2005-09-09 16:23:45 -070097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 int desc_nr; /* descriptor index in the superblock */
99 int raid_disk; /* role of device in array */
NeilBrowne93f68a2010-06-15 09:36:03 +0100100 int new_raid_disk; /* role that the device will have in
101 * the array after a level-change completes.
102 */
NeilBrown41158c72005-06-21 17:17:25 -0700103 int saved_raid_disk; /* role that device used to have in the
104 * array and could again if we did a partial
105 * resync from the bitmap
106 */
NeilBrown5fd6c1d2006-06-26 00:27:40 -0700107 sector_t recovery_offset;/* If this device has been partially
108 * recovered, this is where we were
109 * up to.
110 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 atomic_t nr_pending; /* number of pending requests.
113 * only maintained for arrays that
114 * support hot removal
115 */
NeilBrownba22dcb2005-11-08 21:39:31 -0800116 atomic_t read_errors; /* number of consecutive read errors that
117 * we have tried to ignore.
118 */
Robert Becker1e509152009-12-14 12:49:58 +1100119 struct timespec last_read_error; /* monotonic time since our
120 * last read error
121 */
NeilBrown4dbcdc72006-01-06 00:20:52 -0800122 atomic_t corrected_errors; /* number of corrected read errors,
123 * for reporting to userspace and storing
124 * in superblock.
125 */
NeilBrown5792a282007-04-04 19:08:18 -0700126 struct work_struct del_work; /* used for delayed sysfs removal */
NeilBrown3c0ee632008-10-21 13:25:28 +1100127
128 struct sysfs_dirent *sysfs_state; /* handle for 'state'
129 * sysfs entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130};
131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132struct mddev_s
133{
134 void *private;
NeilBrown2604b702006-01-06 00:20:36 -0800135 struct mdk_personality *pers;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 dev_t unit;
137 int md_minor;
138 struct list_head disks;
NeilBrown850b2b42006-10-03 01:15:46 -0700139 unsigned long flags;
140#define MD_CHANGE_DEVS 0 /* Some device status has changed */
141#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
NeilBrown070dc6d2010-08-30 17:33:34 +1000142#define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */
NeilBrown850b2b42006-10-03 01:15:46 -0700143
NeilBrown409c57f2009-03-31 14:39:39 +1100144 int suspended;
145 atomic_t active_io;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 int ro;
NeilBrownbb4f1e92010-08-08 21:18:03 +1000147 int sysfs_active; /* set when sysfs deletes
148 * are happening, so run/
149 * takeover/stop are not safe
150 */
NeilBrown0ca69882011-01-14 09:14:33 +1100151 int ready; /* See when safe to pass
152 * IO requests down */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 struct gendisk *gendisk;
154
NeilBrowneae17012005-11-08 21:39:23 -0800155 struct kobject kobj;
NeilBrownd3374822009-01-09 08:31:10 +1100156 int hold_active;
157#define UNTIL_IOCTL 1
NeilBrownefeb53c2009-01-09 08:31:10 +1100158#define UNTIL_STOP 2
NeilBrowneae17012005-11-08 21:39:23 -0800159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 /* Superblock information */
161 int major_version,
162 minor_version,
163 patch_version;
164 int persistent;
NeilBrowne6910632008-02-06 01:39:51 -0800165 int external; /* metadata is
166 * managed externally */
167 char metadata_type[17]; /* externally set*/
Andre Noll9d8f0362009-06-18 08:45:01 +1000168 int chunk_sectors;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 time_t ctime, utime;
170 int level, layout;
NeilBrownd9d166c2006-01-06 00:20:51 -0800171 char clevel[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 int raid_disks;
173 int max_disks;
Andre Noll58c0fed2009-03-31 14:33:13 +1100174 sector_t dev_sectors; /* used size of
175 * component devices */
Andre Nollf233ea52008-07-21 17:05:22 +1000176 sector_t array_sectors; /* exported array size */
Dan Williamsb522adc2009-03-31 15:00:31 +1100177 int external_size; /* size managed
178 * externally */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 __u64 events;
NeilBrowna8707c02010-05-18 09:28:43 +1000180 /* If the last 'event' was simply a clean->dirty transition, and
181 * we didn't write it to the spares, then it is safe and simple
182 * to just decrement the event count on a dirty->clean transition.
183 * So we record that possibility here.
184 */
185 int can_decrease_events;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187 char uuid[16];
188
NeilBrownf6705572006-03-27 01:18:11 -0800189 /* If the array is being reshaped, we need to record the
190 * new shape and an indication of where we are up to.
191 * This is written to the superblock.
192 * If reshape_position is MaxSector, then no reshape is happening (yet).
193 */
194 sector_t reshape_position;
Andre Noll664e7c42009-06-18 08:45:27 +1000195 int delta_disks, new_level, new_layout;
196 int new_chunk_sectors;
NeilBrownf6705572006-03-27 01:18:11 -0800197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 struct mdk_thread_s *thread; /* management thread */
199 struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */
NeilBrownff4e8d92006-07-10 04:44:16 -0700200 sector_t curr_resync; /* last block scheduled */
NeilBrown97e4f422009-03-31 14:33:13 +1100201 /* As resync requests can complete out of order, we cannot easily track
202 * how much resync has been completed. So we occasionally pause until
203 * everything completes, then set curr_resync_completed to curr_resync.
204 * As such it may be well behind the real resync mark, but it is a value
205 * we are certain of.
206 */
207 sector_t curr_resync_completed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 unsigned long resync_mark; /* a recent timestamp */
209 sector_t resync_mark_cnt;/* blocks written at resync_mark */
NeilBrownff4e8d92006-07-10 04:44:16 -0700210 sector_t curr_mark_cnt; /* blocks scheduled now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 sector_t resync_max_sectors; /* may be set by personality */
NeilBrown9d888832005-11-08 21:39:26 -0800213
214 sector_t resync_mismatches; /* count of sectors where
215 * parity/replica mismatch found
216 */
NeilBrowne464eaf2006-03-27 01:18:14 -0800217
218 /* allow user-space to request suspension of IO to regions of the array */
219 sector_t suspend_lo;
220 sector_t suspend_hi;
NeilBrown88202a02006-01-06 00:21:36 -0800221 /* if zero, use the system-wide default */
222 int sync_speed_min;
223 int sync_speed_max;
224
Bernd Schubert90b08712008-05-23 13:04:38 -0700225 /* resync even though the same disks are shared among md-devices */
226 int parallel_resync;
227
NeilBrown6ff8d8ec2006-01-06 00:20:15 -0800228 int ok_start_degraded;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 /* recovery/resync flags
230 * NEEDED: we might need to start a resync/recover
231 * RUNNING: a thread is running, or about to be started
232 * SYNC: actually doing a resync, not a recovery
Neil Brown72a23c22008-06-28 08:31:41 +1000233 * RECOVER: doing recovery, or need to try it.
NeilBrowndfc70642008-05-23 13:04:39 -0700234 * INTR: resync needs to be aborted for some reason
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 * DONE: thread is done and is waiting to be reaped
NeilBrown24dd4692005-11-08 21:39:26 -0800236 * REQUEST: user-space has requested a sync (used with SYNC)
Anand Gadiyar411c9402009-07-07 15:24:23 +0530237 * CHECK: user-space request for check-only, no repair
NeilBrownccfcc3c2006-03-27 01:18:09 -0800238 * RESHAPE: A reshape is happening
239 *
240 * If neither SYNC or RESHAPE are set, then it is a recovery.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 */
242#define MD_RECOVERY_RUNNING 0
243#define MD_RECOVERY_SYNC 1
Neil Brown72a23c22008-06-28 08:31:41 +1000244#define MD_RECOVERY_RECOVER 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245#define MD_RECOVERY_INTR 3
246#define MD_RECOVERY_DONE 4
247#define MD_RECOVERY_NEEDED 5
NeilBrown24dd4692005-11-08 21:39:26 -0800248#define MD_RECOVERY_REQUESTED 6
249#define MD_RECOVERY_CHECK 7
NeilBrownccfcc3c2006-03-27 01:18:09 -0800250#define MD_RECOVERY_RESHAPE 8
NeilBrown5fd6c1d2006-06-26 00:27:40 -0700251#define MD_RECOVERY_FROZEN 9
252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 unsigned long recovery;
NeilBrown4044ba52009-01-09 08:31:11 +1100254 int recovery_disabled; /* if we detect that recovery
255 * will always fail, set this
256 * so we don't loop trying */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 int in_sync; /* know to not need resync */
NeilBrownc8c00a62009-08-10 12:50:52 +1000259 /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
260 * that we are never stopping an array while it is open.
261 * 'reconfig_mutex' protects all other reconfiguration.
262 * These locks are separate due to conflicting interactions
263 * with bdev->bd_mutex.
264 * Lock ordering is:
265 * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk
266 * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open
267 */
268 struct mutex open_mutex;
NeilBrowndf5b89b2006-03-27 01:18:20 -0800269 struct mutex reconfig_mutex;
NeilBrownf2ea68c2008-07-21 17:05:25 +1000270 atomic_t active; /* general refcount */
271 atomic_t openers; /* number of active opens */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 int degraded; /* whether md should consider
274 * adding a spare
275 */
276
277 atomic_t recovery_active; /* blocks scheduled, but not written */
278 wait_queue_head_t recovery_wait;
279 sector_t recovery_cp;
Neil Brown5e96ee62008-06-28 08:31:24 +1000280 sector_t resync_min; /* user requested sync
281 * starts here */
NeilBrownc6207272008-02-06 01:39:52 -0800282 sector_t resync_max; /* resync should pause
283 * when it gets here */
NeilBrown06d91a52005-06-21 17:17:12 -0700284
NeilBrownb62b7592008-10-21 13:25:21 +1100285 struct sysfs_dirent *sysfs_state; /* handle for 'array_state'
286 * file in sysfs.
287 */
NeilBrown0c3573f2009-01-09 08:31:05 +1100288 struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */
NeilBrownb62b7592008-10-21 13:25:21 +1100289
NeilBrownd3374822009-01-09 08:31:10 +1100290 struct work_struct del_work; /* used for delayed sysfs removal */
291
NeilBrown06d91a52005-06-21 17:17:12 -0700292 spinlock_t write_lock;
NeilBrown3d310eb2005-06-21 17:17:26 -0700293 wait_queue_head_t sb_wait; /* for waiting on superblock updates */
NeilBrown7bfa19f2005-06-21 17:17:28 -0700294 atomic_t pending_writes; /* number of active superblock writes */
NeilBrown06d91a52005-06-21 17:17:12 -0700295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 unsigned int safemode; /* if set, update "clean" superblock
297 * when no writes pending.
298 */
299 unsigned int safemode_delay;
300 struct timer_list safemode_timer;
301 atomic_t writes_pending;
Jens Axboe165125e2007-07-24 09:28:11 +0200302 struct request_queue *queue; /* for plugging ... */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
NeilBrown32a76272005-06-21 17:17:14 -0700304 struct bitmap *bitmap; /* the bitmap for the device */
NeilBrownc3d97142009-12-14 12:49:52 +1100305 struct {
306 struct file *file; /* the bitmap file */
NeilBrownf6af9492009-12-14 12:49:54 +1100307 loff_t offset; /* offset from superblock of
NeilBrownc3d97142009-12-14 12:49:52 +1100308 * start of bitmap. May be
309 * negative, but not '0'
NeilBrownf6af9492009-12-14 12:49:54 +1100310 * For external metadata, offset
311 * from start of device.
NeilBrownc3d97142009-12-14 12:49:52 +1100312 */
NeilBrownf6af9492009-12-14 12:49:54 +1100313 loff_t default_offset; /* this is the offset to use when
NeilBrownc3d97142009-12-14 12:49:52 +1100314 * hot-adding a bitmap. It should
315 * eventually be settable by sysfs.
316 */
NeilBrowne384e582010-06-01 19:37:34 +1000317 /* When md is serving under dm, it might use a
318 * dirty_log to store the bits.
319 */
320 struct dm_dirty_log *log;
321
NeilBrownc3d97142009-12-14 12:49:52 +1100322 struct mutex mutex;
NeilBrown42a04b52009-12-14 12:49:53 +1100323 unsigned long chunksize;
NeilBrownac2f40b2010-06-01 19:37:31 +1000324 unsigned long daemon_sleep; /* how many jiffies between updates? */
NeilBrown42a04b52009-12-14 12:49:53 +1100325 unsigned long max_write_behind; /* write-behind mode */
NeilBrownece5cff2009-12-14 12:49:56 +1100326 int external;
NeilBrownc3d97142009-12-14 12:49:52 +1100327 } bitmap_info;
NeilBrown32a76272005-06-21 17:17:14 -0700328
Robert Becker1e509152009-12-14 12:49:58 +1100329 atomic_t max_corr_read_errors; /* max read retries */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 struct list_head all_mddevs;
NeilBrowna2826aa2009-12-14 12:49:49 +1100331
NeilBrowna64c8762010-04-14 17:15:37 +1000332 struct attribute_group *to_remove;
NeilBrown252ac522010-06-01 19:37:29 +1000333 struct plug_handle *plug; /* if used by personality */
334
NeilBrowna167f662010-10-26 18:31:13 +1100335 struct bio_set *bio_set;
336
Tejun Heoe9c74692010-09-03 11:56:18 +0200337 /* Generic flush handling.
338 * The last to finish preflush schedules a worker to submit
339 * the rest of the request (without the REQ_FLUSH flag).
NeilBrowna2826aa2009-12-14 12:49:49 +1100340 */
Tejun Heoe9c74692010-09-03 11:56:18 +0200341 struct bio *flush_bio;
NeilBrowna2826aa2009-12-14 12:49:49 +1100342 atomic_t flush_pending;
Tejun Heoe9c74692010-09-03 11:56:18 +0200343 struct work_struct flush_work;
NeilBrown768a4182010-07-26 11:49:55 +1000344 struct work_struct event_work; /* used by dm to report failure event */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345};
346
347
348static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev)
349{
NeilBrownb2d444d2005-11-08 21:39:31 -0800350 int faulty = test_bit(Faulty, &rdev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 if (atomic_dec_and_test(&rdev->nr_pending) && faulty)
352 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
353}
354
355static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors)
356{
357 atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io);
358}
359
NeilBrown2604b702006-01-06 00:20:36 -0800360struct mdk_personality
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361{
362 char *name;
NeilBrown2604b702006-01-06 00:20:36 -0800363 int level;
364 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 struct module *owner;
NeilBrown21a52c62010-04-01 15:02:13 +1100366 int (*make_request)(mddev_t *mddev, struct bio *bio);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 int (*run)(mddev_t *mddev);
368 int (*stop)(mddev_t *mddev);
369 void (*status)(struct seq_file *seq, mddev_t *mddev);
370 /* error_handler must set ->faulty and clear ->in_sync
371 * if appropriate, and should abort recovery if needed
372 */
373 void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev);
374 int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev);
375 int (*hot_remove_disk) (mddev_t *mddev, int number);
376 int (*spare_active) (mddev_t *mddev);
NeilBrown57afd892005-06-21 17:17:13 -0700377 sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 int (*resize) (mddev_t *mddev, sector_t sectors);
Dan Williams80c3a6c2009-03-17 18:10:40 -0700379 sector_t (*size) (mddev_t *mddev, sector_t sectors, int raid_disks);
NeilBrown63c70c42006-03-27 01:18:13 -0800380 int (*check_reshape) (mddev_t *mddev);
381 int (*start_reshape) (mddev_t *mddev);
NeilBrowncea9c222009-03-31 15:15:05 +1100382 void (*finish_reshape) (mddev_t *mddev);
NeilBrown36fa3062005-09-09 16:23:45 -0700383 /* quiesce moves between quiescence states
384 * 0 - fully active
385 * 1 - no new requests allowed
386 * others - reserved
387 */
388 void (*quiesce) (mddev_t *mddev, int state);
NeilBrown245f46c2009-03-31 14:39:39 +1100389 /* takeover is used to transition an array from one
390 * personality to another. The new personality must be able
391 * to handle the data in the current layout.
392 * e.g. 2drive raid1 -> 2drive raid5
393 * ndrive raid5 -> degraded n+1drive raid6 with special layout
394 * If the takeover succeeds, a new 'private' structure is returned.
395 * This needs to be installed and then ->run used to activate the
396 * array.
397 */
398 void *(*takeover) (mddev_t *mddev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399};
400
401
NeilBrown007583c2005-11-08 21:39:30 -0800402struct md_sysfs_entry {
403 struct attribute attr;
404 ssize_t (*show)(mddev_t *, char *);
405 ssize_t (*store)(mddev_t *, const char *, size_t);
406};
NeilBrown43a70502009-12-14 12:49:55 +1100407extern struct attribute_group md_bitmap_group;
NeilBrown007583c2005-11-08 21:39:30 -0800408
NeilBrown00bcb4a2010-06-01 19:37:23 +1000409static inline struct sysfs_dirent *sysfs_get_dirent_safe(struct sysfs_dirent *sd, char *name)
410{
411 if (sd)
412 return sysfs_get_dirent(sd, NULL, name);
413 return sd;
414}
415static inline void sysfs_notify_dirent_safe(struct sysfs_dirent *sd)
416{
417 if (sd)
418 sysfs_notify_dirent(sd);
419}
420
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421static inline char * mdname (mddev_t * mddev)
422{
423 return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
424}
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426/*
427 * iterates through some rdev ringlist. It's safe to remove the
428 * current 'rdev'. Dont touch 'tmp' though.
429 */
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100430#define rdev_for_each_list(rdev, tmp, head) \
431 list_for_each_entry_safe(rdev, tmp, head, same_set)
432
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433/*
434 * iterates through the 'same array disks' ringlist
435 */
NeilBrownd089c6a2008-02-06 01:39:59 -0800436#define rdev_for_each(rdev, tmp, mddev) \
Cheng Renquan159ec1f2009-01-09 08:31:08 +1100437 list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
NeilBrown4b809912008-07-21 17:05:25 +1000439#define rdev_for_each_rcu(rdev, mddev) \
440 list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442typedef struct mdk_thread_s {
443 void (*run) (mddev_t *mddev);
444 mddev_t *mddev;
445 wait_queue_head_t wqueue;
446 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 struct task_struct *tsk;
NeilBrown32a76272005-06-21 17:17:14 -0700448 unsigned long timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449} mdk_thread_t;
450
451#define THREAD_WAKEUP 0
452
453#define __wait_event_lock_irq(wq, condition, lock, cmd) \
454do { \
455 wait_queue_t __wait; \
456 init_waitqueue_entry(&__wait, current); \
457 \
458 add_wait_queue(&wq, &__wait); \
459 for (;;) { \
460 set_current_state(TASK_UNINTERRUPTIBLE); \
461 if (condition) \
462 break; \
463 spin_unlock_irq(&lock); \
464 cmd; \
465 schedule(); \
466 spin_lock_irq(&lock); \
467 } \
468 current->state = TASK_RUNNING; \
469 remove_wait_queue(&wq, &__wait); \
470} while (0)
471
472#define wait_event_lock_irq(wq, condition, lock, cmd) \
473do { \
474 if (condition) \
475 break; \
476 __wait_event_lock_irq(wq, condition, lock, cmd); \
477} while (0)
478
NeilBrown1345b1d2006-01-06 00:20:40 -0800479static inline void safe_put_page(struct page *p)
480{
481 if (p) put_page(p);
482}
483
NeilBrown92022952009-03-31 14:33:13 +1100484extern int register_md_personality(struct mdk_personality *p);
485extern int unregister_md_personality(struct mdk_personality *p);
486extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev),
487 mddev_t *mddev, const char *name);
488extern void md_unregister_thread(mdk_thread_t *thread);
489extern void md_wakeup_thread(mdk_thread_t *thread);
490extern void md_check_recovery(mddev_t *mddev);
491extern void md_write_start(mddev_t *mddev, struct bio *bi);
492extern void md_write_end(mddev_t *mddev);
493extern void md_done_sync(mddev_t *mddev, int blocks, int ok);
494extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev);
495
NeilBrown3fa841d2009-09-23 18:10:29 +1000496extern int mddev_congested(mddev_t *mddev, int bits);
Tejun Heoe9c74692010-09-03 11:56:18 +0200497extern void md_flush_request(mddev_t *mddev, struct bio *bio);
NeilBrown92022952009-03-31 14:33:13 +1100498extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
499 sector_t sector, int size, struct page *page);
500extern void md_super_wait(mddev_t *mddev);
Jonathan Brassowccebd4c2011-01-14 09:14:33 +1100501extern int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size,
502 struct page *page, int rw, bool metadata_op);
NeilBrown92022952009-03-31 14:33:13 +1100503extern void md_do_sync(mddev_t *mddev);
504extern void md_new_event(mddev_t *mddev);
505extern int md_allow_write(mddev_t *mddev);
506extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
Dan Williams1f403622009-03-31 14:59:03 +1100507extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors);
Andre Noll0894cc32009-06-18 08:49:23 +1000508extern int md_check_no_bitmap(mddev_t *mddev);
Andre Nollac5e7112009-08-03 10:59:47 +1000509extern int md_integrity_register(mddev_t *mddev);
NeilBrown72e02072009-12-14 12:49:55 +1100510extern void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
511extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
NeilBrown43a70502009-12-14 12:49:55 +1100512extern void restore_bitmap_write_access(struct file *file);
NeilBrownb63d7c22010-06-01 19:37:33 +1000513extern void md_unplug(mddev_t *mddev);
Christoph Hellwig63fe0812009-04-14 12:01:53 +1000514
NeilBrown390ee602010-06-01 19:37:27 +1000515extern void mddev_init(mddev_t *mddev);
516extern int md_run(mddev_t *mddev);
517extern void md_stop(mddev_t *mddev);
518extern void md_stop_writes(mddev_t *mddev);
NeilBrowne8bb9a82010-06-01 19:37:26 +1000519extern void md_rdev_init(mdk_rdev_t *rdev);
NeilBrown390ee602010-06-01 19:37:27 +1000520
521extern void mddev_suspend(mddev_t *mddev);
522extern void mddev_resume(mddev_t *mddev);
NeilBrowna167f662010-10-26 18:31:13 +1100523extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
524 mddev_t *mddev);
525extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
526 mddev_t *mddev);
Christoph Hellwig63fe0812009-04-14 12:01:53 +1000527#endif /* _MD_MD_H */