Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 Hellwig | 63fe081 | 2009-04-14 12:01:53 +1000 | [diff] [blame] | 15 | #ifndef _MD_MD_H |
| 16 | #define _MD_MD_H |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
Christoph Hellwig | 63fe081 | 2009-04-14 12:01:53 +1000 | [diff] [blame] | 18 | #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 Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 26 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #define MaxSector (~(sector_t)0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | typedef struct mddev_s mddev_t; |
| 30 | typedef struct mdk_rdev_s mdk_rdev_t; |
| 31 | |
NeilBrown | 2ac8740 | 2010-06-01 19:37:29 +1000 | [diff] [blame] | 32 | /* generic plugging support - like that provided with request_queue, |
| 33 | * but does not require a request_queue |
| 34 | */ |
| 35 | struct 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 |
| 42 | void plugger_init(struct plug_handle *plug, |
| 43 | void (*unplug_fn)(struct plug_handle *)); |
| 44 | void plugger_set_plug(struct plug_handle *plug); |
| 45 | int plugger_remove_plug(struct plug_handle *plug); |
| 46 | static 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | * MD's 'extended' device |
| 54 | */ |
| 55 | struct mdk_rdev_s |
| 56 | { |
| 57 | struct list_head same_set; /* RAID devices within the same set */ |
| 58 | |
Andre Noll | dd8ac33 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 59 | sector_t sectors; /* Device size (in 512bytes sectors) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | mddev_t *mddev; /* RAID array if running */ |
NeilBrown | eea1bf3 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 61 | int last_events; /* IO event timestamp */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | struct block_device *bdev; /* block device handle */ |
| 64 | |
| 65 | struct page *sb_page; |
| 66 | int sb_loaded; |
NeilBrown | 4254376 | 2006-06-26 00:27:57 -0700 | [diff] [blame] | 67 | __u64 sb_events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | sector_t data_offset; /* start of data in array */ |
Andre Noll | 0f42035 | 2008-07-11 22:02:23 +1000 | [diff] [blame] | 69 | sector_t sb_start; /* offset of the super block (in 512byte sectors) */ |
NeilBrown | 0002b27 | 2005-09-09 16:23:53 -0700 | [diff] [blame] | 70 | int sb_size; /* bytes in the superblock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | int preferred_minor; /* autorun support */ |
| 72 | |
NeilBrown | 86e6ffd | 2005-11-08 21:39:24 -0800 | [diff] [blame] | 73 | struct kobject kobj; |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | /* 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 86 | 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 */ |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 89 | #define WriteMostly 4 /* Avoid reading if at all possible */ |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 90 | #define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */ |
NeilBrown | c5d79ad | 2008-02-06 01:39:54 -0800 | [diff] [blame] | 91 | #define AllReserved 6 /* If whole device is reserved for |
| 92 | * one array */ |
NeilBrown | d0fae18 | 2008-03-04 14:29:31 -0800 | [diff] [blame] | 93 | #define AutoDetected 7 /* added by auto-detect */ |
Dan Williams | 6bfe0b4 | 2008-04-30 00:52:32 -0700 | [diff] [blame] | 94 | #define Blocked 8 /* An error occured on an externally |
| 95 | * managed array, don't allow writes |
| 96 | * until it is cleared */ |
| 97 | wait_queue_head_t blocked_wait; |
NeilBrown | 8ddf9ef | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | int desc_nr; /* descriptor index in the superblock */ |
| 100 | int raid_disk; /* role of device in array */ |
NeilBrown | e93f68a | 2010-06-15 09:36:03 +0100 | [diff] [blame] | 101 | int new_raid_disk; /* role that the device will have in |
| 102 | * the array after a level-change completes. |
| 103 | */ |
NeilBrown | 41158c7 | 2005-06-21 17:17:25 -0700 | [diff] [blame] | 104 | int saved_raid_disk; /* role that device used to have in the |
| 105 | * array and could again if we did a partial |
| 106 | * resync from the bitmap |
| 107 | */ |
NeilBrown | 5fd6c1d | 2006-06-26 00:27:40 -0700 | [diff] [blame] | 108 | sector_t recovery_offset;/* If this device has been partially |
| 109 | * recovered, this is where we were |
| 110 | * up to. |
| 111 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
| 113 | atomic_t nr_pending; /* number of pending requests. |
| 114 | * only maintained for arrays that |
| 115 | * support hot removal |
| 116 | */ |
NeilBrown | ba22dcb | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 117 | atomic_t read_errors; /* number of consecutive read errors that |
| 118 | * we have tried to ignore. |
| 119 | */ |
Robert Becker | 1e50915 | 2009-12-14 12:49:58 +1100 | [diff] [blame] | 120 | struct timespec last_read_error; /* monotonic time since our |
| 121 | * last read error |
| 122 | */ |
NeilBrown | 4dbcdc7 | 2006-01-06 00:20:52 -0800 | [diff] [blame] | 123 | atomic_t corrected_errors; /* number of corrected read errors, |
| 124 | * for reporting to userspace and storing |
| 125 | * in superblock. |
| 126 | */ |
NeilBrown | 5792a28 | 2007-04-04 19:08:18 -0700 | [diff] [blame] | 127 | struct work_struct del_work; /* used for delayed sysfs removal */ |
NeilBrown | 3c0ee63 | 2008-10-21 13:25:28 +1100 | [diff] [blame] | 128 | |
| 129 | struct sysfs_dirent *sysfs_state; /* handle for 'state' |
| 130 | * sysfs entry */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | }; |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | struct mddev_s |
| 134 | { |
| 135 | void *private; |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 136 | struct mdk_personality *pers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | dev_t unit; |
| 138 | int md_minor; |
| 139 | struct list_head disks; |
NeilBrown | 850b2b4 | 2006-10-03 01:15:46 -0700 | [diff] [blame] | 140 | unsigned long flags; |
| 141 | #define MD_CHANGE_DEVS 0 /* Some device status has changed */ |
| 142 | #define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */ |
| 143 | #define MD_CHANGE_PENDING 2 /* superblock update in progress */ |
| 144 | |
NeilBrown | 409c57f | 2009-03-31 14:39:39 +1100 | [diff] [blame] | 145 | int suspended; |
| 146 | atomic_t active_io; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | int ro; |
| 148 | |
| 149 | struct gendisk *gendisk; |
| 150 | |
NeilBrown | eae1701 | 2005-11-08 21:39:23 -0800 | [diff] [blame] | 151 | struct kobject kobj; |
NeilBrown | d337482 | 2009-01-09 08:31:10 +1100 | [diff] [blame] | 152 | int hold_active; |
| 153 | #define UNTIL_IOCTL 1 |
NeilBrown | efeb53c | 2009-01-09 08:31:10 +1100 | [diff] [blame] | 154 | #define UNTIL_STOP 2 |
NeilBrown | eae1701 | 2005-11-08 21:39:23 -0800 | [diff] [blame] | 155 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | /* Superblock information */ |
| 157 | int major_version, |
| 158 | minor_version, |
| 159 | patch_version; |
| 160 | int persistent; |
NeilBrown | e691063 | 2008-02-06 01:39:51 -0800 | [diff] [blame] | 161 | int external; /* metadata is |
| 162 | * managed externally */ |
| 163 | char metadata_type[17]; /* externally set*/ |
Andre Noll | 9d8f036 | 2009-06-18 08:45:01 +1000 | [diff] [blame] | 164 | int chunk_sectors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | time_t ctime, utime; |
| 166 | int level, layout; |
NeilBrown | d9d166c | 2006-01-06 00:20:51 -0800 | [diff] [blame] | 167 | char clevel[16]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | int raid_disks; |
| 169 | int max_disks; |
Andre Noll | 58c0fed | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 170 | sector_t dev_sectors; /* used size of |
| 171 | * component devices */ |
Andre Noll | f233ea5 | 2008-07-21 17:05:22 +1000 | [diff] [blame] | 172 | sector_t array_sectors; /* exported array size */ |
Dan Williams | b522adc | 2009-03-31 15:00:31 +1100 | [diff] [blame] | 173 | int external_size; /* size managed |
| 174 | * externally */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | __u64 events; |
NeilBrown | a8707c0 | 2010-05-18 09:28:43 +1000 | [diff] [blame] | 176 | /* If the last 'event' was simply a clean->dirty transition, and |
| 177 | * we didn't write it to the spares, then it is safe and simple |
| 178 | * to just decrement the event count on a dirty->clean transition. |
| 179 | * So we record that possibility here. |
| 180 | */ |
| 181 | int can_decrease_events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | char uuid[16]; |
| 184 | |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 185 | /* If the array is being reshaped, we need to record the |
| 186 | * new shape and an indication of where we are up to. |
| 187 | * This is written to the superblock. |
| 188 | * If reshape_position is MaxSector, then no reshape is happening (yet). |
| 189 | */ |
| 190 | sector_t reshape_position; |
Andre Noll | 664e7c4 | 2009-06-18 08:45:27 +1000 | [diff] [blame] | 191 | int delta_disks, new_level, new_layout; |
| 192 | int new_chunk_sectors; |
NeilBrown | f670557 | 2006-03-27 01:18:11 -0800 | [diff] [blame] | 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | struct mdk_thread_s *thread; /* management thread */ |
| 195 | struct mdk_thread_s *sync_thread; /* doing resync or reconstruct */ |
NeilBrown | ff4e8d9 | 2006-07-10 04:44:16 -0700 | [diff] [blame] | 196 | sector_t curr_resync; /* last block scheduled */ |
NeilBrown | 97e4f42 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 197 | /* As resync requests can complete out of order, we cannot easily track |
| 198 | * how much resync has been completed. So we occasionally pause until |
| 199 | * everything completes, then set curr_resync_completed to curr_resync. |
| 200 | * As such it may be well behind the real resync mark, but it is a value |
| 201 | * we are certain of. |
| 202 | */ |
| 203 | sector_t curr_resync_completed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | unsigned long resync_mark; /* a recent timestamp */ |
| 205 | sector_t resync_mark_cnt;/* blocks written at resync_mark */ |
NeilBrown | ff4e8d9 | 2006-07-10 04:44:16 -0700 | [diff] [blame] | 206 | sector_t curr_mark_cnt; /* blocks scheduled now */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | sector_t resync_max_sectors; /* may be set by personality */ |
NeilBrown | 9d88883 | 2005-11-08 21:39:26 -0800 | [diff] [blame] | 209 | |
| 210 | sector_t resync_mismatches; /* count of sectors where |
| 211 | * parity/replica mismatch found |
| 212 | */ |
NeilBrown | e464eaf | 2006-03-27 01:18:14 -0800 | [diff] [blame] | 213 | |
| 214 | /* allow user-space to request suspension of IO to regions of the array */ |
| 215 | sector_t suspend_lo; |
| 216 | sector_t suspend_hi; |
NeilBrown | 88202a0 | 2006-01-06 00:21:36 -0800 | [diff] [blame] | 217 | /* if zero, use the system-wide default */ |
| 218 | int sync_speed_min; |
| 219 | int sync_speed_max; |
| 220 | |
Bernd Schubert | 90b0871 | 2008-05-23 13:04:38 -0700 | [diff] [blame] | 221 | /* resync even though the same disks are shared among md-devices */ |
| 222 | int parallel_resync; |
| 223 | |
NeilBrown | 6ff8d8ec | 2006-01-06 00:20:15 -0800 | [diff] [blame] | 224 | int ok_start_degraded; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | /* recovery/resync flags |
| 226 | * NEEDED: we might need to start a resync/recover |
| 227 | * RUNNING: a thread is running, or about to be started |
| 228 | * SYNC: actually doing a resync, not a recovery |
Neil Brown | 72a23c2 | 2008-06-28 08:31:41 +1000 | [diff] [blame] | 229 | * RECOVER: doing recovery, or need to try it. |
NeilBrown | dfc7064 | 2008-05-23 13:04:39 -0700 | [diff] [blame] | 230 | * INTR: resync needs to be aborted for some reason |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | * DONE: thread is done and is waiting to be reaped |
NeilBrown | 24dd469 | 2005-11-08 21:39:26 -0800 | [diff] [blame] | 232 | * REQUEST: user-space has requested a sync (used with SYNC) |
Anand Gadiyar | 411c940 | 2009-07-07 15:24:23 +0530 | [diff] [blame] | 233 | * CHECK: user-space request for check-only, no repair |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 234 | * RESHAPE: A reshape is happening |
| 235 | * |
| 236 | * If neither SYNC or RESHAPE are set, then it is a recovery. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | */ |
| 238 | #define MD_RECOVERY_RUNNING 0 |
| 239 | #define MD_RECOVERY_SYNC 1 |
Neil Brown | 72a23c2 | 2008-06-28 08:31:41 +1000 | [diff] [blame] | 240 | #define MD_RECOVERY_RECOVER 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | #define MD_RECOVERY_INTR 3 |
| 242 | #define MD_RECOVERY_DONE 4 |
| 243 | #define MD_RECOVERY_NEEDED 5 |
NeilBrown | 24dd469 | 2005-11-08 21:39:26 -0800 | [diff] [blame] | 244 | #define MD_RECOVERY_REQUESTED 6 |
| 245 | #define MD_RECOVERY_CHECK 7 |
NeilBrown | ccfcc3c | 2006-03-27 01:18:09 -0800 | [diff] [blame] | 246 | #define MD_RECOVERY_RESHAPE 8 |
NeilBrown | 5fd6c1d | 2006-06-26 00:27:40 -0700 | [diff] [blame] | 247 | #define MD_RECOVERY_FROZEN 9 |
| 248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | unsigned long recovery; |
NeilBrown | 4044ba5 | 2009-01-09 08:31:11 +1100 | [diff] [blame] | 250 | int recovery_disabled; /* if we detect that recovery |
| 251 | * will always fail, set this |
| 252 | * so we don't loop trying */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | int in_sync; /* know to not need resync */ |
NeilBrown | c8c00a6 | 2009-08-10 12:50:52 +1000 | [diff] [blame] | 255 | /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so |
| 256 | * that we are never stopping an array while it is open. |
| 257 | * 'reconfig_mutex' protects all other reconfiguration. |
| 258 | * These locks are separate due to conflicting interactions |
| 259 | * with bdev->bd_mutex. |
| 260 | * Lock ordering is: |
| 261 | * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk |
| 262 | * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open |
| 263 | */ |
| 264 | struct mutex open_mutex; |
NeilBrown | df5b89b | 2006-03-27 01:18:20 -0800 | [diff] [blame] | 265 | struct mutex reconfig_mutex; |
NeilBrown | f2ea68c | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 266 | atomic_t active; /* general refcount */ |
| 267 | atomic_t openers; /* number of active opens */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | int degraded; /* whether md should consider |
| 270 | * adding a spare |
| 271 | */ |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 272 | int barriers_work; /* initialised to true, cleared as soon |
| 273 | * as a barrier request to slave |
| 274 | * fails. Only supported |
| 275 | */ |
| 276 | struct bio *biolist; /* bios that need to be retried |
| 277 | * because BIO_RW_BARRIER is not supported |
| 278 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
| 280 | atomic_t recovery_active; /* blocks scheduled, but not written */ |
| 281 | wait_queue_head_t recovery_wait; |
| 282 | sector_t recovery_cp; |
Neil Brown | 5e96ee6 | 2008-06-28 08:31:24 +1000 | [diff] [blame] | 283 | sector_t resync_min; /* user requested sync |
| 284 | * starts here */ |
NeilBrown | c620727 | 2008-02-06 01:39:52 -0800 | [diff] [blame] | 285 | sector_t resync_max; /* resync should pause |
| 286 | * when it gets here */ |
NeilBrown | 06d91a5 | 2005-06-21 17:17:12 -0700 | [diff] [blame] | 287 | |
NeilBrown | b62b759 | 2008-10-21 13:25:21 +1100 | [diff] [blame] | 288 | struct sysfs_dirent *sysfs_state; /* handle for 'array_state' |
| 289 | * file in sysfs. |
| 290 | */ |
NeilBrown | 0c3573f | 2009-01-09 08:31:05 +1100 | [diff] [blame] | 291 | struct sysfs_dirent *sysfs_action; /* handle for 'sync_action' */ |
NeilBrown | b62b759 | 2008-10-21 13:25:21 +1100 | [diff] [blame] | 292 | |
NeilBrown | d337482 | 2009-01-09 08:31:10 +1100 | [diff] [blame] | 293 | struct work_struct del_work; /* used for delayed sysfs removal */ |
| 294 | |
NeilBrown | 06d91a5 | 2005-06-21 17:17:12 -0700 | [diff] [blame] | 295 | spinlock_t write_lock; |
NeilBrown | 3d310eb | 2005-06-21 17:17:26 -0700 | [diff] [blame] | 296 | wait_queue_head_t sb_wait; /* for waiting on superblock updates */ |
NeilBrown | 7bfa19f | 2005-06-21 17:17:28 -0700 | [diff] [blame] | 297 | atomic_t pending_writes; /* number of active superblock writes */ |
NeilBrown | 06d91a5 | 2005-06-21 17:17:12 -0700 | [diff] [blame] | 298 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | unsigned int safemode; /* if set, update "clean" superblock |
| 300 | * when no writes pending. |
| 301 | */ |
| 302 | unsigned int safemode_delay; |
| 303 | struct timer_list safemode_timer; |
| 304 | atomic_t writes_pending; |
Jens Axboe | 165125e | 2007-07-24 09:28:11 +0200 | [diff] [blame] | 305 | struct request_queue *queue; /* for plugging ... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 307 | struct bitmap *bitmap; /* the bitmap for the device */ |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 308 | struct { |
| 309 | struct file *file; /* the bitmap file */ |
NeilBrown | f6af949 | 2009-12-14 12:49:54 +1100 | [diff] [blame] | 310 | loff_t offset; /* offset from superblock of |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 311 | * start of bitmap. May be |
| 312 | * negative, but not '0' |
NeilBrown | f6af949 | 2009-12-14 12:49:54 +1100 | [diff] [blame] | 313 | * For external metadata, offset |
| 314 | * from start of device. |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 315 | */ |
NeilBrown | f6af949 | 2009-12-14 12:49:54 +1100 | [diff] [blame] | 316 | loff_t default_offset; /* this is the offset to use when |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 317 | * hot-adding a bitmap. It should |
| 318 | * eventually be settable by sysfs. |
| 319 | */ |
| 320 | struct mutex mutex; |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 321 | unsigned long chunksize; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 322 | unsigned long daemon_sleep; /* how many jiffies between updates? */ |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 323 | unsigned long max_write_behind; /* write-behind mode */ |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 324 | int external; |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 325 | } bitmap_info; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 326 | |
Robert Becker | 1e50915 | 2009-12-14 12:49:58 +1100 | [diff] [blame] | 327 | atomic_t max_corr_read_errors; /* max read retries */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | struct list_head all_mddevs; |
NeilBrown | a2826aa | 2009-12-14 12:49:49 +1100 | [diff] [blame] | 329 | |
NeilBrown | a64c876 | 2010-04-14 17:15:37 +1000 | [diff] [blame] | 330 | struct attribute_group *to_remove; |
NeilBrown | 252ac52 | 2010-06-01 19:37:29 +1000 | [diff] [blame] | 331 | struct plug_handle *plug; /* if used by personality */ |
| 332 | |
NeilBrown | a2826aa | 2009-12-14 12:49:49 +1100 | [diff] [blame] | 333 | /* Generic barrier handling. |
| 334 | * If there is a pending barrier request, all other |
| 335 | * writes are blocked while the devices are flushed. |
| 336 | * The last to finish a flush schedules a worker to |
| 337 | * submit the barrier request (without the barrier flag), |
| 338 | * then submit more flush requests. |
| 339 | */ |
| 340 | struct bio *barrier; |
| 341 | atomic_t flush_pending; |
| 342 | struct work_struct barrier_work; |
NeilBrown | 768a418 | 2010-07-26 11:49:55 +1000 | [diff] [blame] | 343 | struct work_struct event_work; /* used by dm to report failure event */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | }; |
| 345 | |
| 346 | |
| 347 | static inline void rdev_dec_pending(mdk_rdev_t *rdev, mddev_t *mddev) |
| 348 | { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 349 | int faulty = test_bit(Faulty, &rdev->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | if (atomic_dec_and_test(&rdev->nr_pending) && faulty) |
| 351 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
| 352 | } |
| 353 | |
| 354 | static inline void md_sync_acct(struct block_device *bdev, unsigned long nr_sectors) |
| 355 | { |
| 356 | atomic_add(nr_sectors, &bdev->bd_contains->bd_disk->sync_io); |
| 357 | } |
| 358 | |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 359 | struct mdk_personality |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
| 361 | char *name; |
NeilBrown | 2604b70 | 2006-01-06 00:20:36 -0800 | [diff] [blame] | 362 | int level; |
| 363 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | struct module *owner; |
NeilBrown | 21a52c6 | 2010-04-01 15:02:13 +1100 | [diff] [blame] | 365 | int (*make_request)(mddev_t *mddev, struct bio *bio); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | int (*run)(mddev_t *mddev); |
| 367 | int (*stop)(mddev_t *mddev); |
| 368 | void (*status)(struct seq_file *seq, mddev_t *mddev); |
| 369 | /* error_handler must set ->faulty and clear ->in_sync |
| 370 | * if appropriate, and should abort recovery if needed |
| 371 | */ |
| 372 | void (*error_handler)(mddev_t *mddev, mdk_rdev_t *rdev); |
| 373 | int (*hot_add_disk) (mddev_t *mddev, mdk_rdev_t *rdev); |
| 374 | int (*hot_remove_disk) (mddev_t *mddev, int number); |
| 375 | int (*spare_active) (mddev_t *mddev); |
NeilBrown | 57afd89 | 2005-06-21 17:17:13 -0700 | [diff] [blame] | 376 | sector_t (*sync_request)(mddev_t *mddev, sector_t sector_nr, int *skipped, int go_faster); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | int (*resize) (mddev_t *mddev, sector_t sectors); |
Dan Williams | 80c3a6c | 2009-03-17 18:10:40 -0700 | [diff] [blame] | 378 | sector_t (*size) (mddev_t *mddev, sector_t sectors, int raid_disks); |
NeilBrown | 63c70c4 | 2006-03-27 01:18:13 -0800 | [diff] [blame] | 379 | int (*check_reshape) (mddev_t *mddev); |
| 380 | int (*start_reshape) (mddev_t *mddev); |
NeilBrown | cea9c22 | 2009-03-31 15:15:05 +1100 | [diff] [blame] | 381 | void (*finish_reshape) (mddev_t *mddev); |
NeilBrown | 36fa306 | 2005-09-09 16:23:45 -0700 | [diff] [blame] | 382 | /* quiesce moves between quiescence states |
| 383 | * 0 - fully active |
| 384 | * 1 - no new requests allowed |
| 385 | * others - reserved |
| 386 | */ |
| 387 | void (*quiesce) (mddev_t *mddev, int state); |
NeilBrown | 245f46c | 2009-03-31 14:39:39 +1100 | [diff] [blame] | 388 | /* takeover is used to transition an array from one |
| 389 | * personality to another. The new personality must be able |
| 390 | * to handle the data in the current layout. |
| 391 | * e.g. 2drive raid1 -> 2drive raid5 |
| 392 | * ndrive raid5 -> degraded n+1drive raid6 with special layout |
| 393 | * If the takeover succeeds, a new 'private' structure is returned. |
| 394 | * This needs to be installed and then ->run used to activate the |
| 395 | * array. |
| 396 | */ |
| 397 | void *(*takeover) (mddev_t *mddev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | }; |
| 399 | |
| 400 | |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 401 | struct md_sysfs_entry { |
| 402 | struct attribute attr; |
| 403 | ssize_t (*show)(mddev_t *, char *); |
| 404 | ssize_t (*store)(mddev_t *, const char *, size_t); |
| 405 | }; |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 406 | extern struct attribute_group md_bitmap_group; |
NeilBrown | 007583c | 2005-11-08 21:39:30 -0800 | [diff] [blame] | 407 | |
NeilBrown | 00bcb4a | 2010-06-01 19:37:23 +1000 | [diff] [blame] | 408 | static inline struct sysfs_dirent *sysfs_get_dirent_safe(struct sysfs_dirent *sd, char *name) |
| 409 | { |
| 410 | if (sd) |
| 411 | return sysfs_get_dirent(sd, NULL, name); |
| 412 | return sd; |
| 413 | } |
| 414 | static inline void sysfs_notify_dirent_safe(struct sysfs_dirent *sd) |
| 415 | { |
| 416 | if (sd) |
| 417 | sysfs_notify_dirent(sd); |
| 418 | } |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | static inline char * mdname (mddev_t * mddev) |
| 421 | { |
| 422 | return mddev->gendisk ? mddev->gendisk->disk_name : "mdX"; |
| 423 | } |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | /* |
| 426 | * iterates through some rdev ringlist. It's safe to remove the |
| 427 | * current 'rdev'. Dont touch 'tmp' though. |
| 428 | */ |
Cheng Renquan | 159ec1f | 2009-01-09 08:31:08 +1100 | [diff] [blame] | 429 | #define rdev_for_each_list(rdev, tmp, head) \ |
| 430 | list_for_each_entry_safe(rdev, tmp, head, same_set) |
| 431 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | /* |
| 433 | * iterates through the 'same array disks' ringlist |
| 434 | */ |
NeilBrown | d089c6a | 2008-02-06 01:39:59 -0800 | [diff] [blame] | 435 | #define rdev_for_each(rdev, tmp, mddev) \ |
Cheng Renquan | 159ec1f | 2009-01-09 08:31:08 +1100 | [diff] [blame] | 436 | list_for_each_entry_safe(rdev, tmp, &((mddev)->disks), same_set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
NeilBrown | 4b80991 | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 438 | #define rdev_for_each_rcu(rdev, mddev) \ |
| 439 | list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set) |
| 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | typedef struct mdk_thread_s { |
| 442 | void (*run) (mddev_t *mddev); |
| 443 | mddev_t *mddev; |
| 444 | wait_queue_head_t wqueue; |
| 445 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | struct task_struct *tsk; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 447 | unsigned long timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } mdk_thread_t; |
| 449 | |
| 450 | #define THREAD_WAKEUP 0 |
| 451 | |
| 452 | #define __wait_event_lock_irq(wq, condition, lock, cmd) \ |
| 453 | do { \ |
| 454 | wait_queue_t __wait; \ |
| 455 | init_waitqueue_entry(&__wait, current); \ |
| 456 | \ |
| 457 | add_wait_queue(&wq, &__wait); \ |
| 458 | for (;;) { \ |
| 459 | set_current_state(TASK_UNINTERRUPTIBLE); \ |
| 460 | if (condition) \ |
| 461 | break; \ |
| 462 | spin_unlock_irq(&lock); \ |
| 463 | cmd; \ |
| 464 | schedule(); \ |
| 465 | spin_lock_irq(&lock); \ |
| 466 | } \ |
| 467 | current->state = TASK_RUNNING; \ |
| 468 | remove_wait_queue(&wq, &__wait); \ |
| 469 | } while (0) |
| 470 | |
| 471 | #define wait_event_lock_irq(wq, condition, lock, cmd) \ |
| 472 | do { \ |
| 473 | if (condition) \ |
| 474 | break; \ |
| 475 | __wait_event_lock_irq(wq, condition, lock, cmd); \ |
| 476 | } while (0) |
| 477 | |
NeilBrown | 1345b1d | 2006-01-06 00:20:40 -0800 | [diff] [blame] | 478 | static inline void safe_put_page(struct page *p) |
| 479 | { |
| 480 | if (p) put_page(p); |
| 481 | } |
| 482 | |
NeilBrown | 9202295 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 483 | extern int register_md_personality(struct mdk_personality *p); |
| 484 | extern int unregister_md_personality(struct mdk_personality *p); |
| 485 | extern mdk_thread_t * md_register_thread(void (*run) (mddev_t *mddev), |
| 486 | mddev_t *mddev, const char *name); |
| 487 | extern void md_unregister_thread(mdk_thread_t *thread); |
| 488 | extern void md_wakeup_thread(mdk_thread_t *thread); |
| 489 | extern void md_check_recovery(mddev_t *mddev); |
| 490 | extern void md_write_start(mddev_t *mddev, struct bio *bi); |
| 491 | extern void md_write_end(mddev_t *mddev); |
| 492 | extern void md_done_sync(mddev_t *mddev, int blocks, int ok); |
| 493 | extern void md_error(mddev_t *mddev, mdk_rdev_t *rdev); |
| 494 | |
NeilBrown | 3fa841d | 2009-09-23 18:10:29 +1000 | [diff] [blame] | 495 | extern int mddev_congested(mddev_t *mddev, int bits); |
NeilBrown | a2826aa | 2009-12-14 12:49:49 +1100 | [diff] [blame] | 496 | extern void md_barrier_request(mddev_t *mddev, struct bio *bio); |
NeilBrown | 9202295 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 497 | extern void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
| 498 | sector_t sector, int size, struct page *page); |
| 499 | extern void md_super_wait(mddev_t *mddev); |
| 500 | extern int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
| 501 | struct page *page, int rw); |
| 502 | extern void md_do_sync(mddev_t *mddev); |
| 503 | extern void md_new_event(mddev_t *mddev); |
| 504 | extern int md_allow_write(mddev_t *mddev); |
| 505 | extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev); |
Dan Williams | 1f40362 | 2009-03-31 14:59:03 +1100 | [diff] [blame] | 506 | extern void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors); |
Andre Noll | 0894cc3 | 2009-06-18 08:49:23 +1000 | [diff] [blame] | 507 | extern int md_check_no_bitmap(mddev_t *mddev); |
Andre Noll | ac5e711 | 2009-08-03 10:59:47 +1000 | [diff] [blame] | 508 | extern int md_integrity_register(mddev_t *mddev); |
NeilBrown | 72e0207 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 509 | extern void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev); |
| 510 | extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 511 | extern void restore_bitmap_write_access(struct file *file); |
NeilBrown | b63d7c2 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 512 | extern void md_unplug(mddev_t *mddev); |
Christoph Hellwig | 63fe081 | 2009-04-14 12:01:53 +1000 | [diff] [blame] | 513 | |
NeilBrown | 390ee60 | 2010-06-01 19:37:27 +1000 | [diff] [blame] | 514 | extern void mddev_init(mddev_t *mddev); |
| 515 | extern int md_run(mddev_t *mddev); |
| 516 | extern void md_stop(mddev_t *mddev); |
| 517 | extern void md_stop_writes(mddev_t *mddev); |
NeilBrown | e8bb9a8 | 2010-06-01 19:37:26 +1000 | [diff] [blame] | 518 | extern void md_rdev_init(mdk_rdev_t *rdev); |
NeilBrown | 390ee60 | 2010-06-01 19:37:27 +1000 | [diff] [blame] | 519 | |
| 520 | extern void mddev_suspend(mddev_t *mddev); |
| 521 | extern void mddev_resume(mddev_t *mddev); |
Christoph Hellwig | 63fe081 | 2009-04-14 12:01:53 +1000 | [diff] [blame] | 522 | #endif /* _MD_MD_H */ |