Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | drbd_actlog.c |
| 3 | |
| 4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| 5 | |
| 6 | Copyright (C) 2003-2008, LINBIT Information Technologies GmbH. |
| 7 | Copyright (C) 2003-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| 8 | Copyright (C) 2003-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| 9 | |
| 10 | drbd is free software; you can redistribute it and/or modify |
| 11 | it under the terms of the GNU General Public License as published by |
| 12 | the Free Software Foundation; either version 2, or (at your option) |
| 13 | any later version. |
| 14 | |
| 15 | drbd is distributed in the hope that it will be useful, |
| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | GNU General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with drbd; see the file COPYING. If not, write to |
| 22 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 23 | |
| 24 | */ |
| 25 | |
| 26 | #include <linux/slab.h> |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 27 | #include <linux/crc32c.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 28 | #include <linux/drbd.h> |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 29 | #include <linux/drbd_limits.h> |
| 30 | #include <linux/dynamic_debug.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 31 | #include "drbd_int.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 32 | #include "drbd_wrappers.h" |
| 33 | |
Lars Ellenberg | 85f103d | 2011-03-31 12:06:48 +0200 | [diff] [blame] | 34 | |
| 35 | enum al_transaction_types { |
| 36 | AL_TR_UPDATE = 0, |
| 37 | AL_TR_INITIALIZED = 0xffff |
| 38 | }; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 39 | /* all fields on disc in big endian */ |
| 40 | struct __packed al_transaction_on_disk { |
| 41 | /* don't we all like magic */ |
| 42 | __be32 magic; |
| 43 | |
| 44 | /* to identify the most recent transaction block |
| 45 | * in the on disk ring buffer */ |
| 46 | __be32 tr_number; |
| 47 | |
| 48 | /* checksum on the full 4k block, with this field set to 0. */ |
| 49 | __be32 crc32c; |
| 50 | |
| 51 | /* type of transaction, special transaction types like: |
Lars Ellenberg | 85f103d | 2011-03-31 12:06:48 +0200 | [diff] [blame] | 52 | * purge-all, set-all-idle, set-all-active, ... to-be-defined |
| 53 | * see also enum al_transaction_types */ |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 54 | __be16 transaction_type; |
| 55 | |
| 56 | /* we currently allow only a few thousand extents, |
| 57 | * so 16bit will be enough for the slot number. */ |
| 58 | |
| 59 | /* how many updates in this transaction */ |
| 60 | __be16 n_updates; |
| 61 | |
| 62 | /* maximum slot number, "al-extents" in drbd.conf speak. |
| 63 | * Having this in each transaction should make reconfiguration |
| 64 | * of that parameter easier. */ |
| 65 | __be16 context_size; |
| 66 | |
| 67 | /* slot number the context starts with */ |
| 68 | __be16 context_start_slot_nr; |
| 69 | |
| 70 | /* Some reserved bytes. Expected usage is a 64bit counter of |
| 71 | * sectors-written since device creation, and other data generation tag |
| 72 | * supporting usage */ |
| 73 | __be32 __reserved[4]; |
| 74 | |
| 75 | /* --- 36 byte used --- */ |
| 76 | |
| 77 | /* Reserve space for up to AL_UPDATES_PER_TRANSACTION changes |
| 78 | * in one transaction, then use the remaining byte in the 4k block for |
| 79 | * context information. "Flexible" number of updates per transaction |
| 80 | * does not help, as we have to account for the case when all update |
| 81 | * slots are used anyways, so it would only complicate code without |
| 82 | * additional benefit. |
| 83 | */ |
| 84 | __be16 update_slot_nr[AL_UPDATES_PER_TRANSACTION]; |
| 85 | |
| 86 | /* but the extent number is 32bit, which at an extent size of 4 MiB |
| 87 | * allows to cover device sizes of up to 2**54 Byte (16 PiB) */ |
| 88 | __be32 update_extent_nr[AL_UPDATES_PER_TRANSACTION]; |
| 89 | |
| 90 | /* --- 420 bytes used (36 + 64*6) --- */ |
| 91 | |
| 92 | /* 4096 - 420 = 3676 = 919 * 4 */ |
| 93 | __be32 context[AL_CONTEXT_PER_TRANSACTION]; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 94 | }; |
| 95 | |
| 96 | struct update_odbm_work { |
| 97 | struct drbd_work w; |
| 98 | unsigned int enr; |
| 99 | }; |
| 100 | |
| 101 | struct update_al_work { |
| 102 | struct drbd_work w; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 103 | struct completion event; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 104 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 105 | }; |
| 106 | |
| 107 | struct drbd_atodb_wait { |
| 108 | atomic_t count; |
| 109 | struct completion io_done; |
| 110 | struct drbd_conf *mdev; |
| 111 | int error; |
| 112 | }; |
| 113 | |
| 114 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 115 | static int w_al_write_transaction(struct drbd_work *, int); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 116 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 117 | static int _drbd_md_sync_page_io(struct drbd_conf *mdev, |
| 118 | struct drbd_backing_dev *bdev, |
| 119 | struct page *page, sector_t sector, |
| 120 | int rw, int size) |
| 121 | { |
| 122 | struct bio *bio; |
| 123 | struct drbd_md_io md_io; |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 124 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 125 | |
| 126 | md_io.mdev = mdev; |
| 127 | init_completion(&md_io.event); |
| 128 | md_io.error = 0; |
| 129 | |
Philipp Reisner | a8a4e51 | 2010-08-25 10:21:04 +0200 | [diff] [blame] | 130 | if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags)) |
Lars Ellenberg | 86e1e98 | 2011-06-28 13:22:48 +0200 | [diff] [blame] | 131 | rw |= REQ_FUA | REQ_FLUSH; |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 132 | rw |= REQ_SYNC; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 133 | |
Lars Ellenberg | da4a75d | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 134 | bio = bio_alloc_drbd(GFP_NOIO); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 135 | bio->bi_bdev = bdev->md_bdev; |
| 136 | bio->bi_sector = sector; |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 137 | err = -EIO; |
| 138 | if (bio_add_page(bio, page, size, 0) != size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 139 | goto out; |
| 140 | bio->bi_private = &md_io; |
| 141 | bio->bi_end_io = drbd_md_io_complete; |
| 142 | bio->bi_rw = rw; |
| 143 | |
Andreas Gruenbacher | 0cf9d27 | 2010-12-07 10:43:29 +0100 | [diff] [blame] | 144 | if (drbd_insert_fault(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 145 | bio_endio(bio, -EIO); |
| 146 | else |
| 147 | submit_bio(rw, bio); |
| 148 | wait_for_completion(&md_io.event); |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 149 | if (bio_flagged(bio, BIO_UPTODATE)) |
| 150 | err = md_io.error; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 151 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 152 | out: |
| 153 | bio_put(bio); |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 154 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 155 | } |
| 156 | |
| 157 | int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, |
| 158 | sector_t sector, int rw) |
| 159 | { |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 160 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 161 | struct page *iop = mdev->md_io_page; |
| 162 | |
| 163 | D_ASSERT(mutex_is_locked(&mdev->md_io_mutex)); |
| 164 | |
| 165 | BUG_ON(!bdev->md_bdev); |
| 166 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 167 | dev_dbg(DEV, "meta_data io: %s [%d]:%s(,%llus,%s)\n", |
| 168 | current->comm, current->pid, __func__, |
| 169 | (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 170 | |
| 171 | if (sector < drbd_md_first_sector(bdev) || |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 172 | sector + 7 > drbd_md_last_sector(bdev)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 173 | dev_alert(DEV, "%s [%d]:%s(,%llus,%s) out of range md access!\n", |
| 174 | current->comm, current->pid, __func__, |
| 175 | (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ"); |
| 176 | |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 177 | err = _drbd_md_sync_page_io(mdev, bdev, iop, sector, rw, MD_BLOCK_SIZE); |
| 178 | if (err) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 179 | dev_err(DEV, "drbd_md_sync_page_io(,%llus,%s) failed!\n", |
| 180 | (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 181 | } |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 182 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | static struct lc_element *_al_get(struct drbd_conf *mdev, unsigned int enr) |
| 186 | { |
| 187 | struct lc_element *al_ext; |
| 188 | struct lc_element *tmp; |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 189 | int wake; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 190 | |
| 191 | spin_lock_irq(&mdev->al_lock); |
| 192 | tmp = lc_find(mdev->resync, enr/AL_EXT_PER_BM_SECT); |
| 193 | if (unlikely(tmp != NULL)) { |
| 194 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); |
| 195 | if (test_bit(BME_NO_WRITES, &bm_ext->flags)) { |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 196 | wake = !test_and_set_bit(BME_PRIORITY, &bm_ext->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 197 | spin_unlock_irq(&mdev->al_lock); |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 198 | if (wake) |
| 199 | wake_up(&mdev->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 200 | return NULL; |
| 201 | } |
| 202 | } |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 203 | al_ext = lc_get(mdev->act_log, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 204 | spin_unlock_irq(&mdev->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 205 | return al_ext; |
| 206 | } |
| 207 | |
Lars Ellenberg | 181286a | 2011-03-31 15:18:56 +0200 | [diff] [blame^] | 208 | void drbd_al_begin_io(struct drbd_conf *mdev, struct drbd_interval *i) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 209 | { |
Lars Ellenberg | 181286a | 2011-03-31 15:18:56 +0200 | [diff] [blame^] | 210 | unsigned int enr = (i->sector >> (AL_EXTENT_SHIFT-9)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 211 | struct lc_element *al_ext; |
| 212 | struct update_al_work al_work; |
| 213 | |
| 214 | D_ASSERT(atomic_read(&mdev->local_cnt) > 0); |
| 215 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 216 | wait_event(mdev->al_wait, (al_ext = _al_get(mdev, enr))); |
| 217 | |
| 218 | if (al_ext->lc_number != enr) { |
| 219 | /* drbd_al_write_transaction(mdev,al_ext,enr); |
| 220 | * recurses into generic_make_request(), which |
| 221 | * disallows recursion, bios being serialized on the |
| 222 | * current->bio_tail list now. |
| 223 | * we have to delegate updates to the activity log |
| 224 | * to the worker thread. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 225 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 226 | /* Serialize multiple transactions. |
| 227 | * This uses test_and_set_bit, memory barrier is implicit. |
| 228 | * Optimization potential: |
| 229 | * first check for transaction number > old transaction number, |
| 230 | * so not all waiters have to lock/unlock. */ |
| 231 | wait_event(mdev->al_wait, lc_try_lock_for_transaction(mdev->act_log)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 232 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 233 | /* Double check: it may have been committed by someone else, |
| 234 | * while we have been waiting for the lock. */ |
| 235 | if (al_ext->lc_number != enr) { |
| 236 | init_completion(&al_work.event); |
| 237 | al_work.w.cb = w_al_write_transaction; |
| 238 | al_work.w.mdev = mdev; |
| 239 | drbd_queue_work_front(&mdev->tconn->data.work, &al_work.w); |
| 240 | wait_for_completion(&al_work.event); |
| 241 | |
| 242 | mdev->al_writ_cnt++; |
| 243 | |
| 244 | spin_lock_irq(&mdev->al_lock); |
| 245 | /* FIXME |
| 246 | if (al_work.err) |
| 247 | we need an "lc_cancel" here; |
| 248 | */ |
| 249 | lc_committed(mdev->act_log); |
| 250 | spin_unlock_irq(&mdev->al_lock); |
| 251 | } |
| 252 | lc_unlock(mdev->act_log); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 253 | wake_up(&mdev->al_wait); |
| 254 | } |
| 255 | } |
| 256 | |
Lars Ellenberg | 181286a | 2011-03-31 15:18:56 +0200 | [diff] [blame^] | 257 | void drbd_al_complete_io(struct drbd_conf *mdev, struct drbd_interval *i) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 258 | { |
Lars Ellenberg | 181286a | 2011-03-31 15:18:56 +0200 | [diff] [blame^] | 259 | unsigned int enr = (i->sector >> (AL_EXTENT_SHIFT-9)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 260 | struct lc_element *extent; |
| 261 | unsigned long flags; |
| 262 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 263 | spin_lock_irqsave(&mdev->al_lock, flags); |
| 264 | |
| 265 | extent = lc_find(mdev->act_log, enr); |
| 266 | |
| 267 | if (!extent) { |
| 268 | spin_unlock_irqrestore(&mdev->al_lock, flags); |
| 269 | dev_err(DEV, "al_complete_io() called on inactive extent %u\n", enr); |
| 270 | return; |
| 271 | } |
| 272 | |
| 273 | if (lc_put(mdev->act_log, extent) == 0) |
| 274 | wake_up(&mdev->al_wait); |
| 275 | |
| 276 | spin_unlock_irqrestore(&mdev->al_lock, flags); |
| 277 | } |
| 278 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 279 | #if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT) |
| 280 | /* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT |
| 281 | * are still coupled, or assume too much about their relation. |
| 282 | * Code below will not work if this is violated. |
| 283 | * Will be cleaned up with some followup patch. |
| 284 | */ |
| 285 | # error FIXME |
| 286 | #endif |
| 287 | |
| 288 | static unsigned int al_extent_to_bm_page(unsigned int al_enr) |
| 289 | { |
| 290 | return al_enr >> |
| 291 | /* bit to page */ |
| 292 | ((PAGE_SHIFT + 3) - |
| 293 | /* al extent number to bit */ |
| 294 | (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)); |
| 295 | } |
| 296 | |
| 297 | static unsigned int rs_extent_to_bm_page(unsigned int rs_enr) |
| 298 | { |
| 299 | return rs_enr >> |
| 300 | /* bit to page */ |
| 301 | ((PAGE_SHIFT + 3) - |
| 302 | /* al extent number to bit */ |
| 303 | (BM_EXT_SHIFT - BM_BLOCK_SHIFT)); |
| 304 | } |
| 305 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 306 | static int |
Philipp Reisner | 00d5694 | 2011-02-09 18:09:48 +0100 | [diff] [blame] | 307 | w_al_write_transaction(struct drbd_work *w, int unused) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 308 | { |
| 309 | struct update_al_work *aw = container_of(w, struct update_al_work, w); |
Philipp Reisner | 00d5694 | 2011-02-09 18:09:48 +0100 | [diff] [blame] | 310 | struct drbd_conf *mdev = w->mdev; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 311 | struct al_transaction_on_disk *buffer; |
| 312 | struct lc_element *e; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 313 | sector_t sector; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 314 | int i, mx; |
| 315 | unsigned extent_nr; |
| 316 | unsigned crc = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 317 | |
| 318 | if (!get_ldev(mdev)) { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 319 | dev_err(DEV, "disk is %s, cannot start al transaction\n", |
| 320 | drbd_disk_str(mdev->state.disk)); |
| 321 | aw->err = -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 322 | complete(&((struct update_al_work *)w)->event); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 323 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 324 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 325 | |
Lars Ellenberg | 6719fb0 | 2010-10-18 23:04:07 +0200 | [diff] [blame] | 326 | /* The bitmap write may have failed, causing a state change. */ |
| 327 | if (mdev->state.disk < D_INCONSISTENT) { |
| 328 | dev_err(DEV, |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 329 | "disk is %s, cannot write al transaction\n", |
| 330 | drbd_disk_str(mdev->state.disk)); |
| 331 | aw->err = -EIO; |
Lars Ellenberg | 6719fb0 | 2010-10-18 23:04:07 +0200 | [diff] [blame] | 332 | complete(&((struct update_al_work *)w)->event); |
| 333 | put_ldev(mdev); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 334 | return 0; |
Lars Ellenberg | 6719fb0 | 2010-10-18 23:04:07 +0200 | [diff] [blame] | 335 | } |
| 336 | |
| 337 | mutex_lock(&mdev->md_io_mutex); /* protects md_io_buffer, al_tr_cycle, ... */ |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 338 | buffer = page_address(mdev->md_io_page); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 339 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 340 | memset(buffer, 0, sizeof(*buffer)); |
| 341 | buffer->magic = cpu_to_be32(DRBD_AL_MAGIC); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 342 | buffer->tr_number = cpu_to_be32(mdev->al_tr_number); |
| 343 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 344 | i = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 345 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 346 | /* Even though no one can start to change this list |
| 347 | * once we set the LC_LOCKED -- from drbd_al_begin_io(), |
| 348 | * lc_try_lock_for_transaction() --, someone may still |
| 349 | * be in the process of changing it. */ |
| 350 | spin_lock_irq(&mdev->al_lock); |
| 351 | list_for_each_entry(e, &mdev->act_log->to_be_changed, list) { |
| 352 | if (i == AL_UPDATES_PER_TRANSACTION) { |
| 353 | i++; |
| 354 | break; |
| 355 | } |
| 356 | buffer->update_slot_nr[i] = cpu_to_be16(e->lc_index); |
| 357 | buffer->update_extent_nr[i] = cpu_to_be32(e->lc_new_number); |
| 358 | if (e->lc_number != LC_FREE) |
| 359 | drbd_bm_mark_for_writeout(mdev, |
| 360 | al_extent_to_bm_page(e->lc_number)); |
| 361 | i++; |
| 362 | } |
| 363 | spin_unlock_irq(&mdev->al_lock); |
| 364 | BUG_ON(i > AL_UPDATES_PER_TRANSACTION); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 365 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 366 | buffer->n_updates = cpu_to_be16(i); |
| 367 | for ( ; i < AL_UPDATES_PER_TRANSACTION; i++) { |
| 368 | buffer->update_slot_nr[i] = cpu_to_be16(-1); |
| 369 | buffer->update_extent_nr[i] = cpu_to_be32(LC_FREE); |
| 370 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 371 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 372 | buffer->context_size = cpu_to_be16(mdev->act_log->nr_elements); |
| 373 | buffer->context_start_slot_nr = cpu_to_be16(mdev->al_tr_cycle); |
| 374 | |
| 375 | mx = min_t(int, AL_CONTEXT_PER_TRANSACTION, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 376 | mdev->act_log->nr_elements - mdev->al_tr_cycle); |
| 377 | for (i = 0; i < mx; i++) { |
| 378 | unsigned idx = mdev->al_tr_cycle + i; |
| 379 | extent_nr = lc_element_by_index(mdev->act_log, idx)->lc_number; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 380 | buffer->context[i] = cpu_to_be32(extent_nr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 381 | } |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 382 | for (; i < AL_CONTEXT_PER_TRANSACTION; i++) |
| 383 | buffer->context[i] = cpu_to_be32(LC_FREE); |
| 384 | |
| 385 | mdev->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 386 | if (mdev->al_tr_cycle >= mdev->act_log->nr_elements) |
| 387 | mdev->al_tr_cycle = 0; |
| 388 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 389 | sector = mdev->ldev->md.md_offset |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 390 | + mdev->ldev->md.al_offset |
| 391 | + mdev->al_tr_pos * (MD_BLOCK_SIZE>>9); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 392 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 393 | crc = crc32c(0, buffer, 4096); |
| 394 | buffer->crc32c = cpu_to_be32(crc); |
| 395 | |
| 396 | if (drbd_bm_write_hinted(mdev)) |
| 397 | aw->err = -EIO; |
| 398 | /* drbd_chk_io_error done already */ |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 399 | else if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 400 | aw->err = -EIO; |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 401 | drbd_chk_io_error(mdev, 1, true); |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 402 | } else { |
| 403 | /* advance ringbuffer position and transaction counter */ |
| 404 | mdev->al_tr_pos = (mdev->al_tr_pos + 1) % (MD_AL_SECTORS*512/MD_BLOCK_SIZE); |
| 405 | mdev->al_tr_number++; |
| 406 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 407 | |
| 408 | mutex_unlock(&mdev->md_io_mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 409 | complete(&((struct update_al_work *)w)->event); |
| 410 | put_ldev(mdev); |
| 411 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 412 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 413 | } |
| 414 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 415 | /* FIXME |
| 416 | * reading of the activity log, |
| 417 | * and potentially dirtying of the affected bitmap regions, |
| 418 | * should be done from userland only. |
| 419 | * DRBD would simply always attach with an empty activity log, |
| 420 | * and refuse to attach to something that looks like a crashed primary. |
| 421 | */ |
| 422 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 423 | /** |
| 424 | * drbd_al_read_tr() - Read a single transaction from the on disk activity log |
| 425 | * @mdev: DRBD device. |
| 426 | * @bdev: Block device to read form. |
| 427 | * @b: pointer to an al_transaction. |
| 428 | * @index: On disk slot of the transaction to read. |
| 429 | * |
| 430 | * Returns -1 on IO error, 0 on checksum error and 1 upon success. |
| 431 | */ |
| 432 | static int drbd_al_read_tr(struct drbd_conf *mdev, |
| 433 | struct drbd_backing_dev *bdev, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 434 | int index) |
| 435 | { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 436 | struct al_transaction_on_disk *b = page_address(mdev->md_io_page); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 437 | sector_t sector; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 438 | u32 crc; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 439 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 440 | sector = bdev->md.md_offset |
| 441 | + bdev->md.al_offset |
| 442 | + index * (MD_BLOCK_SIZE>>9); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 443 | |
| 444 | /* Dont process error normally, |
| 445 | * as this is done before disk is attached! */ |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 446 | if (drbd_md_sync_page_io(mdev, bdev, sector, READ)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 447 | return -1; |
| 448 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 449 | if (!expect(b->magic == cpu_to_be32(DRBD_AL_MAGIC))) |
| 450 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 451 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 452 | if (!expect(be16_to_cpu(b->n_updates) <= AL_UPDATES_PER_TRANSACTION)) |
| 453 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 454 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 455 | if (!expect(be16_to_cpu(b->context_size) <= DRBD_AL_EXTENTS_MAX)) |
| 456 | return 0; |
| 457 | |
| 458 | if (!expect(be16_to_cpu(b->context_start_slot_nr) < DRBD_AL_EXTENTS_MAX)) |
| 459 | return 0; |
| 460 | |
| 461 | crc = be32_to_cpu(b->crc32c); |
| 462 | b->crc32c = 0; |
| 463 | if (!expect(crc == crc32c(0, b, 4096))) |
| 464 | return 0; |
| 465 | |
| 466 | return 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | /** |
| 470 | * drbd_al_read_log() - Restores the activity log from its on disk representation. |
| 471 | * @mdev: DRBD device. |
| 472 | * @bdev: Block device to read form. |
| 473 | * |
| 474 | * Returns 1 on success, returns 0 when reading the log failed due to IO errors. |
| 475 | */ |
| 476 | int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) |
| 477 | { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 478 | struct al_transaction_on_disk *b; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 479 | int i; |
| 480 | int rv; |
| 481 | int mx; |
| 482 | int active_extents = 0; |
| 483 | int transactions = 0; |
| 484 | int found_valid = 0; |
Lars Ellenberg | 85f103d | 2011-03-31 12:06:48 +0200 | [diff] [blame] | 485 | int found_initialized = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 486 | int from = 0; |
| 487 | int to = 0; |
| 488 | u32 from_tnr = 0; |
| 489 | u32 to_tnr = 0; |
| 490 | u32 cnr; |
| 491 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 492 | /* Note that this is expected to be called with a newly created, |
| 493 | * clean and all unused activity log of the "expected size". |
| 494 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 495 | |
| 496 | /* lock out all other meta data io for now, |
| 497 | * and make sure the page is mapped. |
| 498 | */ |
| 499 | mutex_lock(&mdev->md_io_mutex); |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 500 | b = page_address(mdev->md_io_page); |
| 501 | |
| 502 | /* Always use the full ringbuffer space for now. |
| 503 | * possible optimization: read in all of it, |
| 504 | * then scan the in-memory pages. */ |
| 505 | |
| 506 | mx = (MD_AL_SECTORS*512/MD_BLOCK_SIZE); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 507 | |
| 508 | /* Find the valid transaction in the log */ |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 509 | for (i = 0; i < mx; i++) { |
| 510 | rv = drbd_al_read_tr(mdev, bdev, i); |
| 511 | /* invalid data in that block */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 512 | if (rv == 0) |
| 513 | continue; |
Lars Ellenberg | 85f103d | 2011-03-31 12:06:48 +0200 | [diff] [blame] | 514 | if (be16_to_cpu(b->transaction_type) == AL_TR_INITIALIZED) { |
| 515 | ++found_initialized; |
| 516 | continue; |
| 517 | } |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 518 | |
| 519 | /* IO error */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 520 | if (rv == -1) { |
| 521 | mutex_unlock(&mdev->md_io_mutex); |
| 522 | return 0; |
| 523 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 524 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 525 | cnr = be32_to_cpu(b->tr_number); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 526 | if (++found_valid == 1) { |
| 527 | from = i; |
| 528 | to = i; |
| 529 | from_tnr = cnr; |
| 530 | to_tnr = cnr; |
| 531 | continue; |
| 532 | } |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 533 | |
| 534 | D_ASSERT(cnr != to_tnr); |
| 535 | D_ASSERT(cnr != from_tnr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 536 | if ((int)cnr - (int)from_tnr < 0) { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 537 | D_ASSERT(from_tnr - cnr + i - from == mx); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 538 | from = i; |
| 539 | from_tnr = cnr; |
| 540 | } |
| 541 | if ((int)cnr - (int)to_tnr > 0) { |
| 542 | D_ASSERT(cnr - to_tnr == i - to); |
| 543 | to = i; |
| 544 | to_tnr = cnr; |
| 545 | } |
| 546 | } |
| 547 | |
| 548 | if (!found_valid) { |
Lars Ellenberg | 85f103d | 2011-03-31 12:06:48 +0200 | [diff] [blame] | 549 | if (found_initialized != mx) |
| 550 | dev_warn(DEV, "No usable activity log found.\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 551 | mutex_unlock(&mdev->md_io_mutex); |
| 552 | return 1; |
| 553 | } |
| 554 | |
| 555 | /* Read the valid transactions. |
| 556 | * dev_info(DEV, "Reading from %d to %d.\n",from,to); */ |
| 557 | i = from; |
| 558 | while (1) { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 559 | struct lc_element *e; |
| 560 | unsigned j, n, slot, extent_nr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 561 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 562 | rv = drbd_al_read_tr(mdev, bdev, i); |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 563 | if (!expect(rv != 0)) |
| 564 | goto cancel; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 565 | if (rv == -1) { |
| 566 | mutex_unlock(&mdev->md_io_mutex); |
| 567 | return 0; |
| 568 | } |
| 569 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 570 | /* deal with different transaction types. |
| 571 | * not yet implemented */ |
| 572 | if (!expect(b->transaction_type == 0)) |
| 573 | goto cancel; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 574 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 575 | /* on the fly re-create/resize activity log? |
| 576 | * will be a special transaction type flag. */ |
| 577 | if (!expect(be16_to_cpu(b->context_size) == mdev->act_log->nr_elements)) |
| 578 | goto cancel; |
| 579 | if (!expect(be16_to_cpu(b->context_start_slot_nr) < mdev->act_log->nr_elements)) |
| 580 | goto cancel; |
| 581 | |
| 582 | /* We are the only user of the activity log right now, |
| 583 | * don't actually need to take that lock. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 584 | spin_lock_irq(&mdev->al_lock); |
| 585 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 586 | /* first, apply the context, ... */ |
| 587 | for (j = 0, slot = be16_to_cpu(b->context_start_slot_nr); |
| 588 | j < AL_CONTEXT_PER_TRANSACTION && |
| 589 | slot < mdev->act_log->nr_elements; j++, slot++) { |
| 590 | extent_nr = be32_to_cpu(b->context[j]); |
| 591 | e = lc_element_by_index(mdev->act_log, slot); |
| 592 | if (e->lc_number != extent_nr) { |
| 593 | if (extent_nr != LC_FREE) |
| 594 | active_extents++; |
| 595 | else |
| 596 | active_extents--; |
| 597 | } |
| 598 | lc_set(mdev->act_log, extent_nr, slot); |
| 599 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 600 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 601 | /* ... then apply the updates, |
| 602 | * which override the context information. |
| 603 | * drbd_al_read_tr already did the rangecheck |
| 604 | * on n <= AL_UPDATES_PER_TRANSACTION */ |
| 605 | n = be16_to_cpu(b->n_updates); |
| 606 | for (j = 0; j < n; j++) { |
| 607 | slot = be16_to_cpu(b->update_slot_nr[j]); |
| 608 | extent_nr = be32_to_cpu(b->update_extent_nr[j]); |
| 609 | if (!expect(slot < mdev->act_log->nr_elements)) |
| 610 | break; |
| 611 | e = lc_element_by_index(mdev->act_log, slot); |
| 612 | if (e->lc_number != extent_nr) { |
| 613 | if (extent_nr != LC_FREE) |
| 614 | active_extents++; |
| 615 | else |
| 616 | active_extents--; |
| 617 | } |
| 618 | lc_set(mdev->act_log, extent_nr, slot); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 619 | } |
| 620 | spin_unlock_irq(&mdev->al_lock); |
| 621 | |
| 622 | transactions++; |
| 623 | |
| 624 | cancel: |
| 625 | if (i == to) |
| 626 | break; |
| 627 | i++; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 628 | if (i >= mx) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 629 | i = 0; |
| 630 | } |
| 631 | |
| 632 | mdev->al_tr_number = to_tnr+1; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 633 | mdev->al_tr_pos = (to + 1) % (MD_AL_SECTORS*512/MD_BLOCK_SIZE); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 634 | |
| 635 | /* ok, we are done with it */ |
| 636 | mutex_unlock(&mdev->md_io_mutex); |
| 637 | |
| 638 | dev_info(DEV, "Found %d transactions (%d active extents) in activity log.\n", |
| 639 | transactions, active_extents); |
| 640 | |
| 641 | return 1; |
| 642 | } |
| 643 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 644 | /** |
Lars Ellenberg | 867f574 | 2011-02-21 13:20:53 +0100 | [diff] [blame] | 645 | * drbd_al_apply_to_bm() - Sets the bitmap to dirty(1) where covered by active AL extents |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 646 | * @mdev: DRBD device. |
| 647 | */ |
| 648 | void drbd_al_apply_to_bm(struct drbd_conf *mdev) |
| 649 | { |
| 650 | unsigned int enr; |
| 651 | unsigned long add = 0; |
| 652 | char ppb[10]; |
Lars Ellenberg | 6719fb0 | 2010-10-18 23:04:07 +0200 | [diff] [blame] | 653 | int i, tmp; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 654 | |
| 655 | wait_event(mdev->al_wait, lc_try_lock(mdev->act_log)); |
| 656 | |
| 657 | for (i = 0; i < mdev->act_log->nr_elements; i++) { |
| 658 | enr = lc_element_by_index(mdev->act_log, i)->lc_number; |
| 659 | if (enr == LC_FREE) |
| 660 | continue; |
Lars Ellenberg | 6719fb0 | 2010-10-18 23:04:07 +0200 | [diff] [blame] | 661 | tmp = drbd_bm_ALe_set_all(mdev, enr); |
| 662 | dynamic_dev_dbg(DEV, "AL: set %d bits in extent %u\n", tmp, enr); |
| 663 | add += tmp; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 664 | } |
| 665 | |
| 666 | lc_unlock(mdev->act_log); |
| 667 | wake_up(&mdev->al_wait); |
| 668 | |
| 669 | dev_info(DEV, "Marked additional %s as out-of-sync based on AL.\n", |
| 670 | ppsize(ppb, Bit2KB(add))); |
| 671 | } |
| 672 | |
| 673 | static int _try_lc_del(struct drbd_conf *mdev, struct lc_element *al_ext) |
| 674 | { |
| 675 | int rv; |
| 676 | |
| 677 | spin_lock_irq(&mdev->al_lock); |
| 678 | rv = (al_ext->refcnt == 0); |
| 679 | if (likely(rv)) |
| 680 | lc_del(mdev->act_log, al_ext); |
| 681 | spin_unlock_irq(&mdev->al_lock); |
| 682 | |
| 683 | return rv; |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * drbd_al_shrink() - Removes all active extents form the activity log |
| 688 | * @mdev: DRBD device. |
| 689 | * |
| 690 | * Removes all active extents form the activity log, waiting until |
| 691 | * the reference count of each entry dropped to 0 first, of course. |
| 692 | * |
| 693 | * You need to lock mdev->act_log with lc_try_lock() / lc_unlock() |
| 694 | */ |
| 695 | void drbd_al_shrink(struct drbd_conf *mdev) |
| 696 | { |
| 697 | struct lc_element *al_ext; |
| 698 | int i; |
| 699 | |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 700 | D_ASSERT(test_bit(__LC_LOCKED, &mdev->act_log->flags)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 701 | |
| 702 | for (i = 0; i < mdev->act_log->nr_elements; i++) { |
| 703 | al_ext = lc_element_by_index(mdev->act_log, i); |
| 704 | if (al_ext->lc_number == LC_FREE) |
| 705 | continue; |
| 706 | wait_event(mdev->al_wait, _try_lc_del(mdev, al_ext)); |
| 707 | } |
| 708 | |
| 709 | wake_up(&mdev->al_wait); |
| 710 | } |
| 711 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 712 | static int w_update_odbm(struct drbd_work *w, int unused) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 713 | { |
| 714 | struct update_odbm_work *udw = container_of(w, struct update_odbm_work, w); |
Philipp Reisner | 00d5694 | 2011-02-09 18:09:48 +0100 | [diff] [blame] | 715 | struct drbd_conf *mdev = w->mdev; |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 716 | struct sib_info sib = { .sib_reason = SIB_SYNC_PROGRESS, }; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 717 | |
| 718 | if (!get_ldev(mdev)) { |
| 719 | if (__ratelimit(&drbd_ratelimit_state)) |
| 720 | dev_warn(DEV, "Can not update on disk bitmap, local IO disabled.\n"); |
| 721 | kfree(udw); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 722 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 723 | } |
| 724 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 725 | drbd_bm_write_page(mdev, rs_extent_to_bm_page(udw->enr)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 726 | put_ldev(mdev); |
| 727 | |
| 728 | kfree(udw); |
| 729 | |
| 730 | if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) { |
| 731 | switch (mdev->state.conn) { |
| 732 | case C_SYNC_SOURCE: case C_SYNC_TARGET: |
| 733 | case C_PAUSED_SYNC_S: case C_PAUSED_SYNC_T: |
| 734 | drbd_resync_finished(mdev); |
| 735 | default: |
| 736 | /* nothing to do */ |
| 737 | break; |
| 738 | } |
| 739 | } |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 740 | drbd_bcast_event(mdev, &sib); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 741 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 742 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | |
| 746 | /* ATTENTION. The AL's extents are 4MB each, while the extents in the |
| 747 | * resync LRU-cache are 16MB each. |
| 748 | * The caller of this function has to hold an get_ldev() reference. |
| 749 | * |
| 750 | * TODO will be obsoleted once we have a caching lru of the on disk bitmap |
| 751 | */ |
| 752 | static void drbd_try_clear_on_disk_bm(struct drbd_conf *mdev, sector_t sector, |
| 753 | int count, int success) |
| 754 | { |
| 755 | struct lc_element *e; |
| 756 | struct update_odbm_work *udw; |
| 757 | |
| 758 | unsigned int enr; |
| 759 | |
| 760 | D_ASSERT(atomic_read(&mdev->local_cnt)); |
| 761 | |
| 762 | /* I simply assume that a sector/size pair never crosses |
| 763 | * a 16 MB extent border. (Currently this is true...) */ |
| 764 | enr = BM_SECT_TO_EXT(sector); |
| 765 | |
| 766 | e = lc_get(mdev->resync, enr); |
| 767 | if (e) { |
| 768 | struct bm_extent *ext = lc_entry(e, struct bm_extent, lce); |
| 769 | if (ext->lce.lc_number == enr) { |
| 770 | if (success) |
| 771 | ext->rs_left -= count; |
| 772 | else |
| 773 | ext->rs_failed += count; |
| 774 | if (ext->rs_left < ext->rs_failed) { |
| 775 | dev_err(DEV, "BAD! sector=%llus enr=%u rs_left=%d " |
| 776 | "rs_failed=%d count=%d\n", |
| 777 | (unsigned long long)sector, |
| 778 | ext->lce.lc_number, ext->rs_left, |
| 779 | ext->rs_failed, count); |
| 780 | dump_stack(); |
| 781 | |
| 782 | lc_put(mdev->resync, &ext->lce); |
Philipp Reisner | 38fa998 | 2011-03-15 18:24:49 +0100 | [diff] [blame] | 783 | conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 784 | return; |
| 785 | } |
| 786 | } else { |
| 787 | /* Normally this element should be in the cache, |
| 788 | * since drbd_rs_begin_io() pulled it already in. |
| 789 | * |
| 790 | * But maybe an application write finished, and we set |
| 791 | * something outside the resync lru_cache in sync. |
| 792 | */ |
| 793 | int rs_left = drbd_bm_e_weight(mdev, enr); |
| 794 | if (ext->flags != 0) { |
| 795 | dev_warn(DEV, "changing resync lce: %d[%u;%02lx]" |
| 796 | " -> %d[%u;00]\n", |
| 797 | ext->lce.lc_number, ext->rs_left, |
| 798 | ext->flags, enr, rs_left); |
| 799 | ext->flags = 0; |
| 800 | } |
| 801 | if (ext->rs_failed) { |
| 802 | dev_warn(DEV, "Kicking resync_lru element enr=%u " |
| 803 | "out with rs_failed=%d\n", |
| 804 | ext->lce.lc_number, ext->rs_failed); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 805 | } |
| 806 | ext->rs_left = rs_left; |
| 807 | ext->rs_failed = success ? 0 : count; |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 808 | /* we don't keep a persistent log of the resync lru, |
| 809 | * we can commit any change right away. */ |
| 810 | lc_committed(mdev->resync); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 811 | } |
| 812 | lc_put(mdev->resync, &ext->lce); |
| 813 | /* no race, we are within the al_lock! */ |
| 814 | |
| 815 | if (ext->rs_left == ext->rs_failed) { |
| 816 | ext->rs_failed = 0; |
| 817 | |
| 818 | udw = kmalloc(sizeof(*udw), GFP_ATOMIC); |
| 819 | if (udw) { |
| 820 | udw->enr = ext->lce.lc_number; |
| 821 | udw->w.cb = w_update_odbm; |
Philipp Reisner | a21e929 | 2011-02-08 15:08:49 +0100 | [diff] [blame] | 822 | udw->w.mdev = mdev; |
Philipp Reisner | e42325a | 2011-01-19 13:55:45 +0100 | [diff] [blame] | 823 | drbd_queue_work_front(&mdev->tconn->data.work, &udw->w); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 824 | } else { |
| 825 | dev_warn(DEV, "Could not kmalloc an udw\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 826 | } |
| 827 | } |
| 828 | } else { |
| 829 | dev_err(DEV, "lc_get() failed! locked=%d/%d flags=%lu\n", |
| 830 | mdev->resync_locked, |
| 831 | mdev->resync->nr_elements, |
| 832 | mdev->resync->flags); |
| 833 | } |
| 834 | } |
| 835 | |
Lars Ellenberg | c6ea14d | 2010-11-05 09:23:37 +0100 | [diff] [blame] | 836 | void drbd_advance_rs_marks(struct drbd_conf *mdev, unsigned long still_to_go) |
| 837 | { |
| 838 | unsigned long now = jiffies; |
| 839 | unsigned long last = mdev->rs_mark_time[mdev->rs_last_mark]; |
| 840 | int next = (mdev->rs_last_mark + 1) % DRBD_SYNC_MARKS; |
| 841 | if (time_after_eq(now, last + DRBD_SYNC_MARK_STEP)) { |
| 842 | if (mdev->rs_mark_left[mdev->rs_last_mark] != still_to_go && |
| 843 | mdev->state.conn != C_PAUSED_SYNC_T && |
| 844 | mdev->state.conn != C_PAUSED_SYNC_S) { |
| 845 | mdev->rs_mark_time[next] = now; |
| 846 | mdev->rs_mark_left[next] = still_to_go; |
| 847 | mdev->rs_last_mark = next; |
| 848 | } |
| 849 | } |
| 850 | } |
| 851 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 852 | /* clear the bit corresponding to the piece of storage in question: |
| 853 | * size byte of data starting from sector. Only clear a bits of the affected |
| 854 | * one ore more _aligned_ BM_BLOCK_SIZE blocks. |
| 855 | * |
| 856 | * called by worker on C_SYNC_TARGET and receiver on SyncSource. |
| 857 | * |
| 858 | */ |
| 859 | void __drbd_set_in_sync(struct drbd_conf *mdev, sector_t sector, int size, |
| 860 | const char *file, const unsigned int line) |
| 861 | { |
| 862 | /* Is called from worker and receiver context _only_ */ |
| 863 | unsigned long sbnr, ebnr, lbnr; |
| 864 | unsigned long count = 0; |
| 865 | sector_t esector, nr_sectors; |
| 866 | int wake_up = 0; |
| 867 | unsigned long flags; |
| 868 | |
Andreas Gruenbacher | c670a39 | 2011-02-21 12:41:39 +0100 | [diff] [blame] | 869 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 870 | dev_err(DEV, "drbd_set_in_sync: sector=%llus size=%d nonsense!\n", |
| 871 | (unsigned long long)sector, size); |
| 872 | return; |
| 873 | } |
| 874 | nr_sectors = drbd_get_capacity(mdev->this_bdev); |
| 875 | esector = sector + (size >> 9) - 1; |
| 876 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 877 | if (!expect(sector < nr_sectors)) |
| 878 | return; |
| 879 | if (!expect(esector < nr_sectors)) |
| 880 | esector = nr_sectors - 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 881 | |
| 882 | lbnr = BM_SECT_TO_BIT(nr_sectors-1); |
| 883 | |
| 884 | /* we clear it (in sync). |
| 885 | * round up start sector, round down end sector. we make sure we only |
| 886 | * clear full, aligned, BM_BLOCK_SIZE (4K) blocks */ |
| 887 | if (unlikely(esector < BM_SECT_PER_BIT-1)) |
| 888 | return; |
| 889 | if (unlikely(esector == (nr_sectors-1))) |
| 890 | ebnr = lbnr; |
| 891 | else |
| 892 | ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1)); |
| 893 | sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1); |
| 894 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 895 | if (sbnr > ebnr) |
| 896 | return; |
| 897 | |
| 898 | /* |
| 899 | * ok, (capacity & 7) != 0 sometimes, but who cares... |
| 900 | * we count rs_{total,left} in bits, not sectors. |
| 901 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 902 | count = drbd_bm_clear_bits(mdev, sbnr, ebnr); |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 903 | if (count && get_ldev(mdev)) { |
Lars Ellenberg | c6ea14d | 2010-11-05 09:23:37 +0100 | [diff] [blame] | 904 | drbd_advance_rs_marks(mdev, drbd_bm_total_weight(mdev)); |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 905 | spin_lock_irqsave(&mdev->al_lock, flags); |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 906 | drbd_try_clear_on_disk_bm(mdev, sector, count, true); |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 907 | spin_unlock_irqrestore(&mdev->al_lock, flags); |
| 908 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 909 | /* just wake_up unconditional now, various lc_chaged(), |
| 910 | * lc_put() in drbd_try_clear_on_disk_bm(). */ |
| 911 | wake_up = 1; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 912 | put_ldev(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 913 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 914 | if (wake_up) |
| 915 | wake_up(&mdev->al_wait); |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * this is intended to set one request worth of data out of sync. |
| 920 | * affects at least 1 bit, |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 921 | * and at most 1+DRBD_MAX_BIO_SIZE/BM_BLOCK_SIZE bits. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 922 | * |
| 923 | * called by tl_clear and drbd_send_dblock (==drbd_make_request). |
| 924 | * so this can be _any_ process. |
| 925 | */ |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 926 | int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, int size, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 927 | const char *file, const unsigned int line) |
| 928 | { |
| 929 | unsigned long sbnr, ebnr, lbnr, flags; |
| 930 | sector_t esector, nr_sectors; |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 931 | unsigned int enr, count = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 932 | struct lc_element *e; |
| 933 | |
Andreas Gruenbacher | c670a39 | 2011-02-21 12:41:39 +0100 | [diff] [blame] | 934 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 935 | dev_err(DEV, "sector: %llus, size: %d\n", |
| 936 | (unsigned long long)sector, size); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 937 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | if (!get_ldev(mdev)) |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 941 | return 0; /* no disk, no metadata, no bitmap to set bits in */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 942 | |
| 943 | nr_sectors = drbd_get_capacity(mdev->this_bdev); |
| 944 | esector = sector + (size >> 9) - 1; |
| 945 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 946 | if (!expect(sector < nr_sectors)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 947 | goto out; |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 948 | if (!expect(esector < nr_sectors)) |
| 949 | esector = nr_sectors - 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 950 | |
| 951 | lbnr = BM_SECT_TO_BIT(nr_sectors-1); |
| 952 | |
| 953 | /* we set it out of sync, |
| 954 | * we do not need to round anything here */ |
| 955 | sbnr = BM_SECT_TO_BIT(sector); |
| 956 | ebnr = BM_SECT_TO_BIT(esector); |
| 957 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 958 | /* ok, (capacity & 7) != 0 sometimes, but who cares... |
| 959 | * we count rs_{total,left} in bits, not sectors. */ |
| 960 | spin_lock_irqsave(&mdev->al_lock, flags); |
| 961 | count = drbd_bm_set_bits(mdev, sbnr, ebnr); |
| 962 | |
| 963 | enr = BM_SECT_TO_EXT(sector); |
| 964 | e = lc_find(mdev->resync, enr); |
| 965 | if (e) |
| 966 | lc_entry(e, struct bm_extent, lce)->rs_left += count; |
| 967 | spin_unlock_irqrestore(&mdev->al_lock, flags); |
| 968 | |
| 969 | out: |
| 970 | put_ldev(mdev); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 971 | |
| 972 | return count; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 973 | } |
| 974 | |
| 975 | static |
| 976 | struct bm_extent *_bme_get(struct drbd_conf *mdev, unsigned int enr) |
| 977 | { |
| 978 | struct lc_element *e; |
| 979 | struct bm_extent *bm_ext; |
| 980 | int wakeup = 0; |
| 981 | unsigned long rs_flags; |
| 982 | |
| 983 | spin_lock_irq(&mdev->al_lock); |
| 984 | if (mdev->resync_locked > mdev->resync->nr_elements/2) { |
| 985 | spin_unlock_irq(&mdev->al_lock); |
| 986 | return NULL; |
| 987 | } |
| 988 | e = lc_get(mdev->resync, enr); |
| 989 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 990 | if (bm_ext) { |
| 991 | if (bm_ext->lce.lc_number != enr) { |
| 992 | bm_ext->rs_left = drbd_bm_e_weight(mdev, enr); |
| 993 | bm_ext->rs_failed = 0; |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 994 | lc_committed(mdev->resync); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 995 | wakeup = 1; |
| 996 | } |
| 997 | if (bm_ext->lce.refcnt == 1) |
| 998 | mdev->resync_locked++; |
| 999 | set_bit(BME_NO_WRITES, &bm_ext->flags); |
| 1000 | } |
| 1001 | rs_flags = mdev->resync->flags; |
| 1002 | spin_unlock_irq(&mdev->al_lock); |
| 1003 | if (wakeup) |
| 1004 | wake_up(&mdev->al_wait); |
| 1005 | |
| 1006 | if (!bm_ext) { |
| 1007 | if (rs_flags & LC_STARVING) |
| 1008 | dev_warn(DEV, "Have to wait for element" |
| 1009 | " (resync LRU too small?)\n"); |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 1010 | BUG_ON(rs_flags & LC_LOCKED); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1011 | } |
| 1012 | |
| 1013 | return bm_ext; |
| 1014 | } |
| 1015 | |
| 1016 | static int _is_in_al(struct drbd_conf *mdev, unsigned int enr) |
| 1017 | { |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 1018 | int rv; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1019 | |
| 1020 | spin_lock_irq(&mdev->al_lock); |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 1021 | rv = lc_is_used(mdev->act_log, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1022 | spin_unlock_irq(&mdev->al_lock); |
| 1023 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1024 | return rv; |
| 1025 | } |
| 1026 | |
| 1027 | /** |
| 1028 | * drbd_rs_begin_io() - Gets an extent in the resync LRU cache and sets it to BME_LOCKED |
| 1029 | * @mdev: DRBD device. |
| 1030 | * @sector: The sector number. |
| 1031 | * |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1032 | * This functions sleeps on al_wait. Returns 0 on success, -EINTR if interrupted. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1033 | */ |
| 1034 | int drbd_rs_begin_io(struct drbd_conf *mdev, sector_t sector) |
| 1035 | { |
| 1036 | unsigned int enr = BM_SECT_TO_EXT(sector); |
| 1037 | struct bm_extent *bm_ext; |
| 1038 | int i, sig; |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1039 | int sa = 200; /* Step aside 200 times, then grab the extent and let app-IO wait. |
| 1040 | 200 times -> 20 seconds. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1041 | |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1042 | retry: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1043 | sig = wait_event_interruptible(mdev->al_wait, |
| 1044 | (bm_ext = _bme_get(mdev, enr))); |
| 1045 | if (sig) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1046 | return -EINTR; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1047 | |
| 1048 | if (test_bit(BME_LOCKED, &bm_ext->flags)) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1049 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1050 | |
| 1051 | for (i = 0; i < AL_EXT_PER_BM_SECT; i++) { |
| 1052 | sig = wait_event_interruptible(mdev->al_wait, |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1053 | !_is_in_al(mdev, enr * AL_EXT_PER_BM_SECT + i) || |
Philipp Reisner | c507f46 | 2010-11-22 15:49:17 +0100 | [diff] [blame] | 1054 | test_bit(BME_PRIORITY, &bm_ext->flags)); |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1055 | |
| 1056 | if (sig || (test_bit(BME_PRIORITY, &bm_ext->flags) && sa)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1057 | spin_lock_irq(&mdev->al_lock); |
| 1058 | if (lc_put(mdev->resync, &bm_ext->lce) == 0) { |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1059 | bm_ext->flags = 0; /* clears BME_NO_WRITES and eventually BME_PRIORITY */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1060 | mdev->resync_locked--; |
| 1061 | wake_up(&mdev->al_wait); |
| 1062 | } |
| 1063 | spin_unlock_irq(&mdev->al_lock); |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1064 | if (sig) |
| 1065 | return -EINTR; |
| 1066 | if (schedule_timeout_interruptible(HZ/10)) |
| 1067 | return -EINTR; |
Philipp Reisner | c507f46 | 2010-11-22 15:49:17 +0100 | [diff] [blame] | 1068 | if (sa && --sa == 0) |
| 1069 | dev_warn(DEV,"drbd_rs_begin_io() stepped aside for 20sec." |
| 1070 | "Resync stalled?\n"); |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1071 | goto retry; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1072 | } |
| 1073 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1074 | set_bit(BME_LOCKED, &bm_ext->flags); |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1075 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1076 | } |
| 1077 | |
| 1078 | /** |
| 1079 | * drbd_try_rs_begin_io() - Gets an extent in the resync LRU cache, does not sleep |
| 1080 | * @mdev: DRBD device. |
| 1081 | * @sector: The sector number. |
| 1082 | * |
| 1083 | * Gets an extent in the resync LRU cache, sets it to BME_NO_WRITES, then |
| 1084 | * tries to set it to BME_LOCKED. Returns 0 upon success, and -EAGAIN |
| 1085 | * if there is still application IO going on in this area. |
| 1086 | */ |
| 1087 | int drbd_try_rs_begin_io(struct drbd_conf *mdev, sector_t sector) |
| 1088 | { |
| 1089 | unsigned int enr = BM_SECT_TO_EXT(sector); |
| 1090 | const unsigned int al_enr = enr*AL_EXT_PER_BM_SECT; |
| 1091 | struct lc_element *e; |
| 1092 | struct bm_extent *bm_ext; |
| 1093 | int i; |
| 1094 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1095 | spin_lock_irq(&mdev->al_lock); |
| 1096 | if (mdev->resync_wenr != LC_FREE && mdev->resync_wenr != enr) { |
| 1097 | /* in case you have very heavy scattered io, it may |
| 1098 | * stall the syncer undefined if we give up the ref count |
| 1099 | * when we try again and requeue. |
| 1100 | * |
| 1101 | * if we don't give up the refcount, but the next time |
| 1102 | * we are scheduled this extent has been "synced" by new |
| 1103 | * application writes, we'd miss the lc_put on the |
| 1104 | * extent we keep the refcount on. |
| 1105 | * so we remembered which extent we had to try again, and |
| 1106 | * if the next requested one is something else, we do |
| 1107 | * the lc_put here... |
| 1108 | * we also have to wake_up |
| 1109 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1110 | e = lc_find(mdev->resync, mdev->resync_wenr); |
| 1111 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1112 | if (bm_ext) { |
| 1113 | D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags)); |
| 1114 | D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags)); |
| 1115 | clear_bit(BME_NO_WRITES, &bm_ext->flags); |
| 1116 | mdev->resync_wenr = LC_FREE; |
| 1117 | if (lc_put(mdev->resync, &bm_ext->lce) == 0) |
| 1118 | mdev->resync_locked--; |
| 1119 | wake_up(&mdev->al_wait); |
| 1120 | } else { |
| 1121 | dev_alert(DEV, "LOGIC BUG\n"); |
| 1122 | } |
| 1123 | } |
| 1124 | /* TRY. */ |
| 1125 | e = lc_try_get(mdev->resync, enr); |
| 1126 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1127 | if (bm_ext) { |
| 1128 | if (test_bit(BME_LOCKED, &bm_ext->flags)) |
| 1129 | goto proceed; |
| 1130 | if (!test_and_set_bit(BME_NO_WRITES, &bm_ext->flags)) { |
| 1131 | mdev->resync_locked++; |
| 1132 | } else { |
| 1133 | /* we did set the BME_NO_WRITES, |
| 1134 | * but then could not set BME_LOCKED, |
| 1135 | * so we tried again. |
| 1136 | * drop the extra reference. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1137 | bm_ext->lce.refcnt--; |
| 1138 | D_ASSERT(bm_ext->lce.refcnt > 0); |
| 1139 | } |
| 1140 | goto check_al; |
| 1141 | } else { |
| 1142 | /* do we rather want to try later? */ |
Jens Axboe | 6a0afdf | 2009-10-01 09:04:14 +0200 | [diff] [blame] | 1143 | if (mdev->resync_locked > mdev->resync->nr_elements-3) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1144 | goto try_again; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1145 | /* Do or do not. There is no try. -- Yoda */ |
| 1146 | e = lc_get(mdev->resync, enr); |
| 1147 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1148 | if (!bm_ext) { |
| 1149 | const unsigned long rs_flags = mdev->resync->flags; |
| 1150 | if (rs_flags & LC_STARVING) |
| 1151 | dev_warn(DEV, "Have to wait for element" |
| 1152 | " (resync LRU too small?)\n"); |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 1153 | BUG_ON(rs_flags & LC_LOCKED); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1154 | goto try_again; |
| 1155 | } |
| 1156 | if (bm_ext->lce.lc_number != enr) { |
| 1157 | bm_ext->rs_left = drbd_bm_e_weight(mdev, enr); |
| 1158 | bm_ext->rs_failed = 0; |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 1159 | lc_committed(mdev->resync); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1160 | wake_up(&mdev->al_wait); |
| 1161 | D_ASSERT(test_bit(BME_LOCKED, &bm_ext->flags) == 0); |
| 1162 | } |
| 1163 | set_bit(BME_NO_WRITES, &bm_ext->flags); |
| 1164 | D_ASSERT(bm_ext->lce.refcnt == 1); |
| 1165 | mdev->resync_locked++; |
| 1166 | goto check_al; |
| 1167 | } |
| 1168 | check_al: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1169 | for (i = 0; i < AL_EXT_PER_BM_SECT; i++) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1170 | if (lc_is_used(mdev->act_log, al_enr+i)) |
| 1171 | goto try_again; |
| 1172 | } |
| 1173 | set_bit(BME_LOCKED, &bm_ext->flags); |
| 1174 | proceed: |
| 1175 | mdev->resync_wenr = LC_FREE; |
| 1176 | spin_unlock_irq(&mdev->al_lock); |
| 1177 | return 0; |
| 1178 | |
| 1179 | try_again: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1180 | if (bm_ext) |
| 1181 | mdev->resync_wenr = enr; |
| 1182 | spin_unlock_irq(&mdev->al_lock); |
| 1183 | return -EAGAIN; |
| 1184 | } |
| 1185 | |
| 1186 | void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector) |
| 1187 | { |
| 1188 | unsigned int enr = BM_SECT_TO_EXT(sector); |
| 1189 | struct lc_element *e; |
| 1190 | struct bm_extent *bm_ext; |
| 1191 | unsigned long flags; |
| 1192 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1193 | spin_lock_irqsave(&mdev->al_lock, flags); |
| 1194 | e = lc_find(mdev->resync, enr); |
| 1195 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1196 | if (!bm_ext) { |
| 1197 | spin_unlock_irqrestore(&mdev->al_lock, flags); |
| 1198 | if (__ratelimit(&drbd_ratelimit_state)) |
| 1199 | dev_err(DEV, "drbd_rs_complete_io() called, but extent not found\n"); |
| 1200 | return; |
| 1201 | } |
| 1202 | |
| 1203 | if (bm_ext->lce.refcnt == 0) { |
| 1204 | spin_unlock_irqrestore(&mdev->al_lock, flags); |
| 1205 | dev_err(DEV, "drbd_rs_complete_io(,%llu [=%u]) called, " |
| 1206 | "but refcnt is 0!?\n", |
| 1207 | (unsigned long long)sector, enr); |
| 1208 | return; |
| 1209 | } |
| 1210 | |
| 1211 | if (lc_put(mdev->resync, &bm_ext->lce) == 0) { |
Philipp Reisner | e3555d8 | 2010-11-07 15:56:29 +0100 | [diff] [blame] | 1212 | bm_ext->flags = 0; /* clear BME_LOCKED, BME_NO_WRITES and BME_PRIORITY */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1213 | mdev->resync_locked--; |
| 1214 | wake_up(&mdev->al_wait); |
| 1215 | } |
| 1216 | |
| 1217 | spin_unlock_irqrestore(&mdev->al_lock, flags); |
| 1218 | } |
| 1219 | |
| 1220 | /** |
| 1221 | * drbd_rs_cancel_all() - Removes all extents from the resync LRU (even BME_LOCKED) |
| 1222 | * @mdev: DRBD device. |
| 1223 | */ |
| 1224 | void drbd_rs_cancel_all(struct drbd_conf *mdev) |
| 1225 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1226 | spin_lock_irq(&mdev->al_lock); |
| 1227 | |
| 1228 | if (get_ldev_if_state(mdev, D_FAILED)) { /* Makes sure ->resync is there. */ |
| 1229 | lc_reset(mdev->resync); |
| 1230 | put_ldev(mdev); |
| 1231 | } |
| 1232 | mdev->resync_locked = 0; |
| 1233 | mdev->resync_wenr = LC_FREE; |
| 1234 | spin_unlock_irq(&mdev->al_lock); |
| 1235 | wake_up(&mdev->al_wait); |
| 1236 | } |
| 1237 | |
| 1238 | /** |
| 1239 | * drbd_rs_del_all() - Gracefully remove all extents from the resync LRU |
| 1240 | * @mdev: DRBD device. |
| 1241 | * |
| 1242 | * Returns 0 upon success, -EAGAIN if at least one reference count was |
| 1243 | * not zero. |
| 1244 | */ |
| 1245 | int drbd_rs_del_all(struct drbd_conf *mdev) |
| 1246 | { |
| 1247 | struct lc_element *e; |
| 1248 | struct bm_extent *bm_ext; |
| 1249 | int i; |
| 1250 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1251 | spin_lock_irq(&mdev->al_lock); |
| 1252 | |
| 1253 | if (get_ldev_if_state(mdev, D_FAILED)) { |
| 1254 | /* ok, ->resync is there. */ |
| 1255 | for (i = 0; i < mdev->resync->nr_elements; i++) { |
| 1256 | e = lc_element_by_index(mdev->resync, i); |
Philipp Reisner | b2b163d | 2010-04-02 08:40:33 +0200 | [diff] [blame] | 1257 | bm_ext = lc_entry(e, struct bm_extent, lce); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1258 | if (bm_ext->lce.lc_number == LC_FREE) |
| 1259 | continue; |
| 1260 | if (bm_ext->lce.lc_number == mdev->resync_wenr) { |
| 1261 | dev_info(DEV, "dropping %u in drbd_rs_del_all, apparently" |
| 1262 | " got 'synced' by application io\n", |
| 1263 | mdev->resync_wenr); |
| 1264 | D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags)); |
| 1265 | D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags)); |
| 1266 | clear_bit(BME_NO_WRITES, &bm_ext->flags); |
| 1267 | mdev->resync_wenr = LC_FREE; |
| 1268 | lc_put(mdev->resync, &bm_ext->lce); |
| 1269 | } |
| 1270 | if (bm_ext->lce.refcnt != 0) { |
| 1271 | dev_info(DEV, "Retrying drbd_rs_del_all() later. " |
| 1272 | "refcnt=%d\n", bm_ext->lce.refcnt); |
| 1273 | put_ldev(mdev); |
| 1274 | spin_unlock_irq(&mdev->al_lock); |
| 1275 | return -EAGAIN; |
| 1276 | } |
| 1277 | D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags)); |
| 1278 | D_ASSERT(!test_bit(BME_NO_WRITES, &bm_ext->flags)); |
| 1279 | lc_del(mdev->resync, &bm_ext->lce); |
| 1280 | } |
| 1281 | D_ASSERT(mdev->resync->used == 0); |
| 1282 | put_ldev(mdev); |
| 1283 | } |
| 1284 | spin_unlock_irq(&mdev->al_lock); |
| 1285 | |
| 1286 | return 0; |
| 1287 | } |
| 1288 | |
| 1289 | /** |
| 1290 | * drbd_rs_failed_io() - Record information on a failure to resync the specified blocks |
| 1291 | * @mdev: DRBD device. |
| 1292 | * @sector: The sector number. |
| 1293 | * @size: Size of failed IO operation, in byte. |
| 1294 | */ |
| 1295 | void drbd_rs_failed_io(struct drbd_conf *mdev, sector_t sector, int size) |
| 1296 | { |
| 1297 | /* Is called from worker and receiver context _only_ */ |
| 1298 | unsigned long sbnr, ebnr, lbnr; |
| 1299 | unsigned long count; |
| 1300 | sector_t esector, nr_sectors; |
| 1301 | int wake_up = 0; |
| 1302 | |
Andreas Gruenbacher | c670a39 | 2011-02-21 12:41:39 +0100 | [diff] [blame] | 1303 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_BIO_SIZE) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1304 | dev_err(DEV, "drbd_rs_failed_io: sector=%llus size=%d nonsense!\n", |
| 1305 | (unsigned long long)sector, size); |
| 1306 | return; |
| 1307 | } |
| 1308 | nr_sectors = drbd_get_capacity(mdev->this_bdev); |
| 1309 | esector = sector + (size >> 9) - 1; |
| 1310 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1311 | if (!expect(sector < nr_sectors)) |
| 1312 | return; |
| 1313 | if (!expect(esector < nr_sectors)) |
| 1314 | esector = nr_sectors - 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1315 | |
| 1316 | lbnr = BM_SECT_TO_BIT(nr_sectors-1); |
| 1317 | |
| 1318 | /* |
| 1319 | * round up start sector, round down end sector. we make sure we only |
| 1320 | * handle full, aligned, BM_BLOCK_SIZE (4K) blocks */ |
| 1321 | if (unlikely(esector < BM_SECT_PER_BIT-1)) |
| 1322 | return; |
| 1323 | if (unlikely(esector == (nr_sectors-1))) |
| 1324 | ebnr = lbnr; |
| 1325 | else |
| 1326 | ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1)); |
| 1327 | sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1); |
| 1328 | |
| 1329 | if (sbnr > ebnr) |
| 1330 | return; |
| 1331 | |
| 1332 | /* |
| 1333 | * ok, (capacity & 7) != 0 sometimes, but who cares... |
| 1334 | * we count rs_{total,left} in bits, not sectors. |
| 1335 | */ |
| 1336 | spin_lock_irq(&mdev->al_lock); |
| 1337 | count = drbd_bm_count_bits(mdev, sbnr, ebnr); |
| 1338 | if (count) { |
| 1339 | mdev->rs_failed += count; |
| 1340 | |
| 1341 | if (get_ldev(mdev)) { |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1342 | drbd_try_clear_on_disk_bm(mdev, sector, count, false); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1343 | put_ldev(mdev); |
| 1344 | } |
| 1345 | |
| 1346 | /* just wake_up unconditional now, various lc_chaged(), |
| 1347 | * lc_put() in drbd_try_clear_on_disk_bm(). */ |
| 1348 | wake_up = 1; |
| 1349 | } |
| 1350 | spin_unlock_irq(&mdev->al_lock); |
| 1351 | if (wake_up) |
| 1352 | wake_up(&mdev->al_wait); |
| 1353 | } |