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 | |
Lars Ellenberg | 85f103d | 2011-03-31 12:06:48 +0200 | [diff] [blame] | 33 | |
| 34 | enum al_transaction_types { |
| 35 | AL_TR_UPDATE = 0, |
| 36 | AL_TR_INITIALIZED = 0xffff |
| 37 | }; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 38 | /* all fields on disc in big endian */ |
| 39 | struct __packed al_transaction_on_disk { |
| 40 | /* don't we all like magic */ |
| 41 | __be32 magic; |
| 42 | |
| 43 | /* to identify the most recent transaction block |
| 44 | * in the on disk ring buffer */ |
| 45 | __be32 tr_number; |
| 46 | |
| 47 | /* checksum on the full 4k block, with this field set to 0. */ |
| 48 | __be32 crc32c; |
| 49 | |
| 50 | /* type of transaction, special transaction types like: |
Lars Ellenberg | 85f103d | 2011-03-31 12:06:48 +0200 | [diff] [blame] | 51 | * purge-all, set-all-idle, set-all-active, ... to-be-defined |
| 52 | * see also enum al_transaction_types */ |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 53 | __be16 transaction_type; |
| 54 | |
| 55 | /* we currently allow only a few thousand extents, |
| 56 | * so 16bit will be enough for the slot number. */ |
| 57 | |
| 58 | /* how many updates in this transaction */ |
| 59 | __be16 n_updates; |
| 60 | |
| 61 | /* maximum slot number, "al-extents" in drbd.conf speak. |
| 62 | * Having this in each transaction should make reconfiguration |
| 63 | * of that parameter easier. */ |
| 64 | __be16 context_size; |
| 65 | |
| 66 | /* slot number the context starts with */ |
| 67 | __be16 context_start_slot_nr; |
| 68 | |
| 69 | /* Some reserved bytes. Expected usage is a 64bit counter of |
| 70 | * sectors-written since device creation, and other data generation tag |
| 71 | * supporting usage */ |
| 72 | __be32 __reserved[4]; |
| 73 | |
| 74 | /* --- 36 byte used --- */ |
| 75 | |
| 76 | /* Reserve space for up to AL_UPDATES_PER_TRANSACTION changes |
| 77 | * in one transaction, then use the remaining byte in the 4k block for |
| 78 | * context information. "Flexible" number of updates per transaction |
| 79 | * does not help, as we have to account for the case when all update |
| 80 | * slots are used anyways, so it would only complicate code without |
| 81 | * additional benefit. |
| 82 | */ |
| 83 | __be16 update_slot_nr[AL_UPDATES_PER_TRANSACTION]; |
| 84 | |
| 85 | /* but the extent number is 32bit, which at an extent size of 4 MiB |
| 86 | * allows to cover device sizes of up to 2**54 Byte (16 PiB) */ |
| 87 | __be32 update_extent_nr[AL_UPDATES_PER_TRANSACTION]; |
| 88 | |
| 89 | /* --- 420 bytes used (36 + 64*6) --- */ |
| 90 | |
| 91 | /* 4096 - 420 = 3676 = 919 * 4 */ |
| 92 | __be32 context[AL_CONTEXT_PER_TRANSACTION]; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 93 | }; |
| 94 | |
| 95 | struct update_odbm_work { |
| 96 | struct drbd_work w; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 97 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 98 | unsigned int enr; |
| 99 | }; |
| 100 | |
| 101 | struct update_al_work { |
| 102 | struct drbd_work w; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 103 | struct drbd_device *device; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 104 | struct completion event; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 105 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 106 | }; |
| 107 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 108 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 109 | void *drbd_md_get_buffer(struct drbd_device *device) |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 110 | { |
| 111 | int r; |
| 112 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 113 | wait_event(device->misc_wait, |
| 114 | (r = atomic_cmpxchg(&device->md_io_in_use, 0, 1)) == 0 || |
| 115 | device->state.disk <= D_FAILED); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 116 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 117 | return r ? NULL : page_address(device->md_io_page); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 118 | } |
| 119 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 120 | void drbd_md_put_buffer(struct drbd_device *device) |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 121 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 122 | if (atomic_dec_and_test(&device->md_io_in_use)) |
| 123 | wake_up(&device->misc_wait); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 124 | } |
| 125 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 126 | void wait_until_done_or_force_detached(struct drbd_device *device, struct drbd_backing_dev *bdev, |
Philipp Reisner | 32db80f | 2012-02-22 11:51:57 +0100 | [diff] [blame] | 127 | unsigned int *done) |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 128 | { |
Philipp Reisner | 32db80f | 2012-02-22 11:51:57 +0100 | [diff] [blame] | 129 | long dt; |
| 130 | |
| 131 | rcu_read_lock(); |
| 132 | dt = rcu_dereference(bdev->disk_conf)->disk_timeout; |
| 133 | rcu_read_unlock(); |
| 134 | dt = dt * HZ / 10; |
| 135 | if (dt == 0) |
| 136 | dt = MAX_SCHEDULE_TIMEOUT; |
| 137 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 138 | dt = wait_event_timeout(device->misc_wait, |
| 139 | *done || test_bit(FORCE_DETACH, &device->flags), dt); |
Lars Ellenberg | e34b677 | 2012-09-27 15:07:11 +0200 | [diff] [blame] | 140 | if (dt == 0) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 141 | drbd_err(device, "meta-data IO operation timed out\n"); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 142 | drbd_chk_io_error(device, 1, DRBD_FORCE_DETACH); |
Lars Ellenberg | e34b677 | 2012-09-27 15:07:11 +0200 | [diff] [blame] | 143 | } |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 144 | } |
| 145 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 146 | static int _drbd_md_sync_page_io(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 147 | struct drbd_backing_dev *bdev, |
| 148 | struct page *page, sector_t sector, |
| 149 | int rw, int size) |
| 150 | { |
| 151 | struct bio *bio; |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 152 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 153 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 154 | device->md_io.done = 0; |
| 155 | device->md_io.error = -ENODEV; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 156 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 157 | if ((rw & WRITE) && !test_bit(MD_NO_FUA, &device->flags)) |
Lars Ellenberg | 86e1e98 | 2011-06-28 13:22:48 +0200 | [diff] [blame] | 158 | rw |= REQ_FUA | REQ_FLUSH; |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 159 | rw |= REQ_SYNC; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 160 | |
Lars Ellenberg | da4a75d | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 161 | bio = bio_alloc_drbd(GFP_NOIO); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 162 | bio->bi_bdev = bdev->md_bdev; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 163 | bio->bi_iter.bi_sector = sector; |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 164 | err = -EIO; |
| 165 | if (bio_add_page(bio, page, size, 0) != size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 166 | goto out; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 167 | bio->bi_private = &device->md_io; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 168 | bio->bi_end_io = drbd_md_io_complete; |
| 169 | bio->bi_rw = rw; |
| 170 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 171 | if (!(rw & WRITE) && device->state.disk == D_DISKLESS && device->ldev == NULL) |
Lars Ellenberg | c04ccaa | 2013-03-19 18:16:47 +0100 | [diff] [blame] | 172 | /* special case, drbd_md_read() during drbd_adm_attach(): no get_ldev */ |
| 173 | ; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 174 | else if (!get_ldev_if_state(device, D_ATTACHING)) { |
Lars Ellenberg | c04ccaa | 2013-03-19 18:16:47 +0100 | [diff] [blame] | 175 | /* Corresponding put_ldev in drbd_md_io_complete() */ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 176 | drbd_err(device, "ASSERT FAILED: get_ldev_if_state() == 1 in _drbd_md_sync_page_io()\n"); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 177 | err = -ENODEV; |
| 178 | goto out; |
| 179 | } |
| 180 | |
| 181 | bio_get(bio); /* one bio_put() is in the completion handler */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 182 | atomic_inc(&device->md_io_in_use); /* drbd_md_put_buffer() is in the completion handler */ |
| 183 | if (drbd_insert_fault(device, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 184 | bio_endio(bio, -EIO); |
| 185 | else |
| 186 | submit_bio(rw, bio); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 187 | wait_until_done_or_force_detached(device, bdev, &device->md_io.done); |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 188 | if (bio_flagged(bio, BIO_UPTODATE)) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 189 | err = device->md_io.error; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 190 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 191 | out: |
| 192 | bio_put(bio); |
Andreas Gruenbacher | ac29f40 | 2010-12-13 02:20:47 +0100 | [diff] [blame] | 193 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 194 | } |
| 195 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 196 | int drbd_md_sync_page_io(struct drbd_device *device, struct drbd_backing_dev *bdev, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 197 | sector_t sector, int rw) |
| 198 | { |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 199 | int err; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 200 | struct page *iop = device->md_io_page; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 201 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 202 | D_ASSERT(device, atomic_read(&device->md_io_in_use) == 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 203 | |
| 204 | BUG_ON(!bdev->md_bdev); |
| 205 | |
Lars Ellenberg | e4d7d6f | 2014-04-28 18:43:28 +0200 | [diff] [blame] | 206 | dynamic_drbd_dbg(device, "meta_data io: %s [%d]:%s(,%llus,%s) %pS\n", |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 207 | current->comm, current->pid, __func__, |
Lars Ellenberg | c04ccaa | 2013-03-19 18:16:47 +0100 | [diff] [blame] | 208 | (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ", |
| 209 | (void*)_RET_IP_ ); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 210 | |
| 211 | if (sector < drbd_md_first_sector(bdev) || |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 212 | sector + 7 > drbd_md_last_sector(bdev)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 213 | drbd_alert(device, "%s [%d]:%s(,%llus,%s) out of range md access!\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 214 | current->comm, current->pid, __func__, |
| 215 | (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ"); |
| 216 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 217 | /* we do all our meta data IO in aligned 4k blocks. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 218 | err = _drbd_md_sync_page_io(device, bdev, iop, sector, rw, 4096); |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 219 | if (err) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 220 | drbd_err(device, "drbd_md_sync_page_io(,%llus,%s) failed with error %d\n", |
Andreas Gruenbacher | 935be26 | 2011-08-19 13:47:31 +0200 | [diff] [blame] | 221 | (unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ", err); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 222 | } |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 223 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 224 | } |
| 225 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 226 | static struct bm_extent *find_active_resync_extent(struct drbd_device *device, unsigned int enr) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 227 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 228 | struct lc_element *tmp; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 229 | tmp = lc_find(device->resync, enr/AL_EXT_PER_BM_SECT); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 230 | if (unlikely(tmp != NULL)) { |
| 231 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); |
Lars Ellenberg | 6c3c4355 | 2013-03-19 18:16:53 +0100 | [diff] [blame] | 232 | if (test_bit(BME_NO_WRITES, &bm_ext->flags)) |
| 233 | return bm_ext; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 234 | } |
Lars Ellenberg | 6c3c4355 | 2013-03-19 18:16:53 +0100 | [diff] [blame] | 235 | return NULL; |
| 236 | } |
| 237 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 238 | static struct lc_element *_al_get(struct drbd_device *device, unsigned int enr, bool nonblock) |
Lars Ellenberg | 6c3c4355 | 2013-03-19 18:16:53 +0100 | [diff] [blame] | 239 | { |
| 240 | struct lc_element *al_ext; |
| 241 | struct bm_extent *bm_ext; |
| 242 | int wake; |
| 243 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 244 | spin_lock_irq(&device->al_lock); |
| 245 | bm_ext = find_active_resync_extent(device, enr); |
Lars Ellenberg | 6c3c4355 | 2013-03-19 18:16:53 +0100 | [diff] [blame] | 246 | if (bm_ext) { |
| 247 | wake = !test_and_set_bit(BME_PRIORITY, &bm_ext->flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 248 | spin_unlock_irq(&device->al_lock); |
Lars Ellenberg | 6c3c4355 | 2013-03-19 18:16:53 +0100 | [diff] [blame] | 249 | if (wake) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 250 | wake_up(&device->al_wait); |
Lars Ellenberg | 6c3c4355 | 2013-03-19 18:16:53 +0100 | [diff] [blame] | 251 | return NULL; |
| 252 | } |
| 253 | if (nonblock) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 254 | al_ext = lc_try_get(device->act_log, enr); |
Lars Ellenberg | 6c3c4355 | 2013-03-19 18:16:53 +0100 | [diff] [blame] | 255 | else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 256 | al_ext = lc_get(device->act_log, enr); |
| 257 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 258 | return al_ext; |
| 259 | } |
| 260 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 261 | bool drbd_al_begin_io_fastpath(struct drbd_device *device, struct drbd_interval *i) |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 262 | { |
| 263 | /* for bios crossing activity log extent boundaries, |
| 264 | * we may need to activate two extents in one go */ |
| 265 | unsigned first = i->sector >> (AL_EXTENT_SHIFT-9); |
| 266 | unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 267 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 268 | D_ASSERT(device, (unsigned)(last - first) <= 1); |
| 269 | D_ASSERT(device, atomic_read(&device->local_cnt) > 0); |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 270 | |
| 271 | /* FIXME figure out a fast path for bios crossing AL extent boundaries */ |
| 272 | if (first != last) |
| 273 | return false; |
| 274 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 275 | return _al_get(device, first, true); |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 276 | } |
| 277 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 278 | bool drbd_al_begin_io_prepare(struct drbd_device *device, struct drbd_interval *i) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 279 | { |
Lars Ellenberg | 7726547 | 2011-03-31 16:00:51 +0200 | [diff] [blame] | 280 | /* for bios crossing activity log extent boundaries, |
| 281 | * we may need to activate two extents in one go */ |
Lars Ellenberg | e15766e | 2011-04-01 10:38:30 +0200 | [diff] [blame] | 282 | unsigned first = i->sector >> (AL_EXTENT_SHIFT-9); |
Lars Ellenberg | 81a3537 | 2012-07-30 09:00:54 +0200 | [diff] [blame] | 283 | unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); |
Lars Ellenberg | e15766e | 2011-04-01 10:38:30 +0200 | [diff] [blame] | 284 | unsigned enr; |
Lars Ellenberg | ebfd5d8 | 2013-03-19 18:16:49 +0100 | [diff] [blame] | 285 | bool need_transaction = false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 286 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 287 | D_ASSERT(device, first <= last); |
| 288 | D_ASSERT(device, atomic_read(&device->local_cnt) > 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 289 | |
Lars Ellenberg | ebfd5d8 | 2013-03-19 18:16:49 +0100 | [diff] [blame] | 290 | for (enr = first; enr <= last; enr++) { |
| 291 | struct lc_element *al_ext; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 292 | wait_event(device->al_wait, |
| 293 | (al_ext = _al_get(device, enr, false)) != NULL); |
Lars Ellenberg | ebfd5d8 | 2013-03-19 18:16:49 +0100 | [diff] [blame] | 294 | if (al_ext->lc_number != enr) |
| 295 | need_transaction = true; |
| 296 | } |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 297 | return need_transaction; |
| 298 | } |
Lars Ellenberg | ebfd5d8 | 2013-03-19 18:16:49 +0100 | [diff] [blame] | 299 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 300 | static int al_write_transaction(struct drbd_device *device, bool delegate); |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 301 | |
| 302 | /* When called through generic_make_request(), we must delegate |
| 303 | * activity log I/O to the worker thread: a further request |
| 304 | * submitted via generic_make_request() within the same task |
| 305 | * would be queued on current->bio_list, and would only start |
| 306 | * after this function returns (see generic_make_request()). |
| 307 | * |
| 308 | * However, if we *are* the worker, we must not delegate to ourselves. |
| 309 | */ |
| 310 | |
| 311 | /* |
| 312 | * @delegate: delegate activity log I/O to the worker thread |
| 313 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 314 | void drbd_al_begin_io_commit(struct drbd_device *device, bool delegate) |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 315 | { |
| 316 | bool locked = false; |
| 317 | |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 318 | BUG_ON(delegate && current == first_peer_device(device)->connection->worker.task); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 319 | |
Lars Ellenberg | 7dc1d67 | 2011-05-03 16:49:20 +0200 | [diff] [blame] | 320 | /* Serialize multiple transactions. |
| 321 | * This uses test_and_set_bit, memory barrier is implicit. |
| 322 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 323 | wait_event(device->al_wait, |
| 324 | device->act_log->pending_changes == 0 || |
| 325 | (locked = lc_try_lock_for_transaction(device->act_log))); |
Lars Ellenberg | 7dc1d67 | 2011-05-03 16:49:20 +0200 | [diff] [blame] | 326 | |
| 327 | if (locked) { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 328 | /* Double check: it may have been committed by someone else, |
| 329 | * while we have been waiting for the lock. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 330 | if (device->act_log->pending_changes) { |
Philipp Reisner | 9a51ab1 | 2012-02-20 21:53:28 +0100 | [diff] [blame] | 331 | bool write_al_updates; |
| 332 | |
| 333 | rcu_read_lock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 334 | write_al_updates = rcu_dereference(device->ldev->disk_conf)->al_updates; |
Philipp Reisner | 9a51ab1 | 2012-02-20 21:53:28 +0100 | [diff] [blame] | 335 | rcu_read_unlock(); |
| 336 | |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 337 | if (write_al_updates) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 338 | al_write_transaction(device, delegate); |
| 339 | spin_lock_irq(&device->al_lock); |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 340 | /* FIXME |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 341 | if (err) |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 342 | we need an "lc_cancel" here; |
| 343 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 344 | lc_committed(device->act_log); |
| 345 | spin_unlock_irq(&device->al_lock); |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 346 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 347 | lc_unlock(device->act_log); |
| 348 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 349 | } |
| 350 | } |
| 351 | |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 352 | /* |
| 353 | * @delegate: delegate activity log I/O to the worker thread |
| 354 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 355 | void drbd_al_begin_io(struct drbd_device *device, struct drbd_interval *i, bool delegate) |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 356 | { |
Andreas Gruenbacher | a6b32bc | 2011-05-31 14:33:49 +0200 | [diff] [blame] | 357 | BUG_ON(delegate && current == first_peer_device(device)->connection->worker.task); |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 358 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 359 | if (drbd_al_begin_io_prepare(device, i)) |
| 360 | drbd_al_begin_io_commit(device, delegate); |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 361 | } |
| 362 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 363 | int drbd_al_begin_io_nonblock(struct drbd_device *device, struct drbd_interval *i) |
Lars Ellenberg | 08a1dda | 2013-03-19 18:16:56 +0100 | [diff] [blame] | 364 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 365 | struct lru_cache *al = device->act_log; |
Lars Ellenberg | 08a1dda | 2013-03-19 18:16:56 +0100 | [diff] [blame] | 366 | /* for bios crossing activity log extent boundaries, |
| 367 | * we may need to activate two extents in one go */ |
| 368 | unsigned first = i->sector >> (AL_EXTENT_SHIFT-9); |
| 369 | unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); |
| 370 | unsigned nr_al_extents; |
| 371 | unsigned available_update_slots; |
| 372 | unsigned enr; |
| 373 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 374 | D_ASSERT(device, first <= last); |
Lars Ellenberg | 08a1dda | 2013-03-19 18:16:56 +0100 | [diff] [blame] | 375 | |
| 376 | nr_al_extents = 1 + last - first; /* worst case: all touched extends are cold. */ |
| 377 | available_update_slots = min(al->nr_elements - al->used, |
| 378 | al->max_pending_changes - al->pending_changes); |
| 379 | |
| 380 | /* We want all necessary updates for a given request within the same transaction |
| 381 | * We could first check how many updates are *actually* needed, |
| 382 | * and use that instead of the worst-case nr_al_extents */ |
| 383 | if (available_update_slots < nr_al_extents) |
| 384 | return -EWOULDBLOCK; |
| 385 | |
| 386 | /* Is resync active in this area? */ |
| 387 | for (enr = first; enr <= last; enr++) { |
| 388 | struct lc_element *tmp; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 389 | tmp = lc_find(device->resync, enr/AL_EXT_PER_BM_SECT); |
Lars Ellenberg | 08a1dda | 2013-03-19 18:16:56 +0100 | [diff] [blame] | 390 | if (unlikely(tmp != NULL)) { |
| 391 | struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce); |
| 392 | if (test_bit(BME_NO_WRITES, &bm_ext->flags)) { |
Lars Ellenberg | 0b6ef41 | 2013-03-27 14:08:49 +0100 | [diff] [blame] | 393 | if (!test_and_set_bit(BME_PRIORITY, &bm_ext->flags)) |
Lars Ellenberg | 08a1dda | 2013-03-19 18:16:56 +0100 | [diff] [blame] | 394 | return -EBUSY; |
| 395 | return -EWOULDBLOCK; |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | |
| 400 | /* Checkout the refcounts. |
| 401 | * Given that we checked for available elements and update slots above, |
| 402 | * this has to be successful. */ |
| 403 | for (enr = first; enr <= last; enr++) { |
| 404 | struct lc_element *al_ext; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 405 | al_ext = lc_get_cumulative(device->act_log, enr); |
Lars Ellenberg | 08a1dda | 2013-03-19 18:16:56 +0100 | [diff] [blame] | 406 | if (!al_ext) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 407 | drbd_info(device, "LOGIC BUG for enr=%u\n", enr); |
Lars Ellenberg | 08a1dda | 2013-03-19 18:16:56 +0100 | [diff] [blame] | 408 | } |
| 409 | return 0; |
| 410 | } |
| 411 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 412 | void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 413 | { |
Lars Ellenberg | e15766e | 2011-04-01 10:38:30 +0200 | [diff] [blame] | 414 | /* for bios crossing activity log extent boundaries, |
| 415 | * we may need to activate two extents in one go */ |
| 416 | unsigned first = i->sector >> (AL_EXTENT_SHIFT-9); |
Lars Ellenberg | 81a3537 | 2012-07-30 09:00:54 +0200 | [diff] [blame] | 417 | unsigned last = i->size == 0 ? first : (i->sector + (i->size >> 9) - 1) >> (AL_EXTENT_SHIFT-9); |
Lars Ellenberg | e15766e | 2011-04-01 10:38:30 +0200 | [diff] [blame] | 418 | unsigned enr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 419 | struct lc_element *extent; |
| 420 | unsigned long flags; |
| 421 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 422 | D_ASSERT(device, first <= last); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 423 | spin_lock_irqsave(&device->al_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 424 | |
Lars Ellenberg | e15766e | 2011-04-01 10:38:30 +0200 | [diff] [blame] | 425 | for (enr = first; enr <= last; enr++) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 426 | extent = lc_find(device->act_log, enr); |
Lars Ellenberg | e15766e | 2011-04-01 10:38:30 +0200 | [diff] [blame] | 427 | if (!extent) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 428 | drbd_err(device, "al_complete_io() called on inactive extent %u\n", enr); |
Lars Ellenberg | e15766e | 2011-04-01 10:38:30 +0200 | [diff] [blame] | 429 | continue; |
| 430 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 431 | lc_put(device->act_log, extent); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 432 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 433 | spin_unlock_irqrestore(&device->al_lock, flags); |
| 434 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 435 | } |
| 436 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 437 | #if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT) |
| 438 | /* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT |
| 439 | * are still coupled, or assume too much about their relation. |
| 440 | * Code below will not work if this is violated. |
| 441 | * Will be cleaned up with some followup patch. |
| 442 | */ |
| 443 | # error FIXME |
| 444 | #endif |
| 445 | |
| 446 | static unsigned int al_extent_to_bm_page(unsigned int al_enr) |
| 447 | { |
| 448 | return al_enr >> |
| 449 | /* bit to page */ |
| 450 | ((PAGE_SHIFT + 3) - |
| 451 | /* al extent number to bit */ |
| 452 | (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)); |
| 453 | } |
| 454 | |
| 455 | static unsigned int rs_extent_to_bm_page(unsigned int rs_enr) |
| 456 | { |
| 457 | return rs_enr >> |
| 458 | /* bit to page */ |
| 459 | ((PAGE_SHIFT + 3) - |
Lars Ellenberg | acb104c3 | 2011-04-28 07:58:24 +0200 | [diff] [blame] | 460 | /* resync extent number to bit */ |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 461 | (BM_EXT_SHIFT - BM_BLOCK_SHIFT)); |
| 462 | } |
| 463 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 464 | static sector_t al_tr_number_to_on_disk_sector(struct drbd_device *device) |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 465 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 466 | const unsigned int stripes = device->ldev->md.al_stripes; |
| 467 | const unsigned int stripe_size_4kB = device->ldev->md.al_stripe_size_4k; |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 468 | |
| 469 | /* transaction number, modulo on-disk ring buffer wrap around */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 470 | unsigned int t = device->al_tr_number % (device->ldev->md.al_size_4k); |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 471 | |
| 472 | /* ... to aligned 4k on disk block */ |
| 473 | t = ((t % stripes) * stripe_size_4kB) + t/stripes; |
| 474 | |
| 475 | /* ... to 512 byte sector in activity log */ |
| 476 | t *= 8; |
| 477 | |
| 478 | /* ... plus offset to the on disk position */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 479 | return device->ldev->md.md_offset + device->ldev->md.al_offset + t; |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 480 | } |
| 481 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 482 | static int |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 483 | _al_write_transaction(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 484 | { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 485 | struct al_transaction_on_disk *buffer; |
| 486 | struct lc_element *e; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 487 | sector_t sector; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 488 | int i, mx; |
| 489 | unsigned extent_nr; |
| 490 | unsigned crc = 0; |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 491 | int err = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 492 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 493 | if (!get_ldev(device)) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 494 | drbd_err(device, "disk is %s, cannot start al transaction\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 495 | drbd_disk_str(device->state.disk)); |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 496 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 497 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 498 | |
Lars Ellenberg | 6719fb0 | 2010-10-18 23:04:07 +0200 | [diff] [blame] | 499 | /* The bitmap write may have failed, causing a state change. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 500 | if (device->state.disk < D_INCONSISTENT) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 501 | drbd_err(device, |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 502 | "disk is %s, cannot write al transaction\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 503 | drbd_disk_str(device->state.disk)); |
| 504 | put_ldev(device); |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 505 | return -EIO; |
Lars Ellenberg | 6719fb0 | 2010-10-18 23:04:07 +0200 | [diff] [blame] | 506 | } |
| 507 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 508 | buffer = drbd_md_get_buffer(device); /* protects md_io_buffer, al_tr_cycle, ... */ |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 509 | if (!buffer) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 510 | drbd_err(device, "disk failed while waiting for md_io buffer\n"); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 511 | put_ldev(device); |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 512 | return -ENODEV; |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 513 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 514 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 515 | memset(buffer, 0, sizeof(*buffer)); |
| 516 | buffer->magic = cpu_to_be32(DRBD_AL_MAGIC); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 517 | buffer->tr_number = cpu_to_be32(device->al_tr_number); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 518 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 519 | i = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 520 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 521 | /* Even though no one can start to change this list |
| 522 | * once we set the LC_LOCKED -- from drbd_al_begin_io(), |
| 523 | * lc_try_lock_for_transaction() --, someone may still |
| 524 | * be in the process of changing it. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 525 | spin_lock_irq(&device->al_lock); |
| 526 | list_for_each_entry(e, &device->act_log->to_be_changed, list) { |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 527 | if (i == AL_UPDATES_PER_TRANSACTION) { |
| 528 | i++; |
| 529 | break; |
| 530 | } |
| 531 | buffer->update_slot_nr[i] = cpu_to_be16(e->lc_index); |
| 532 | buffer->update_extent_nr[i] = cpu_to_be32(e->lc_new_number); |
| 533 | if (e->lc_number != LC_FREE) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 534 | drbd_bm_mark_for_writeout(device, |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 535 | al_extent_to_bm_page(e->lc_number)); |
| 536 | i++; |
| 537 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 538 | spin_unlock_irq(&device->al_lock); |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 539 | BUG_ON(i > AL_UPDATES_PER_TRANSACTION); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 540 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 541 | buffer->n_updates = cpu_to_be16(i); |
| 542 | for ( ; i < AL_UPDATES_PER_TRANSACTION; i++) { |
| 543 | buffer->update_slot_nr[i] = cpu_to_be16(-1); |
| 544 | buffer->update_extent_nr[i] = cpu_to_be32(LC_FREE); |
| 545 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 546 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 547 | buffer->context_size = cpu_to_be16(device->act_log->nr_elements); |
| 548 | buffer->context_start_slot_nr = cpu_to_be16(device->al_tr_cycle); |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 549 | |
| 550 | mx = min_t(int, AL_CONTEXT_PER_TRANSACTION, |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 551 | device->act_log->nr_elements - device->al_tr_cycle); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 552 | for (i = 0; i < mx; i++) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 553 | unsigned idx = device->al_tr_cycle + i; |
| 554 | extent_nr = lc_element_by_index(device->act_log, idx)->lc_number; |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 555 | buffer->context[i] = cpu_to_be32(extent_nr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 556 | } |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 557 | for (; i < AL_CONTEXT_PER_TRANSACTION; i++) |
| 558 | buffer->context[i] = cpu_to_be32(LC_FREE); |
| 559 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 560 | device->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION; |
| 561 | if (device->al_tr_cycle >= device->act_log->nr_elements) |
| 562 | device->al_tr_cycle = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 563 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 564 | sector = al_tr_number_to_on_disk_sector(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 565 | |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 566 | crc = crc32c(0, buffer, 4096); |
| 567 | buffer->crc32c = cpu_to_be32(crc); |
| 568 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 569 | if (drbd_bm_write_hinted(device)) |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 570 | err = -EIO; |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 571 | else { |
| 572 | bool write_al_updates; |
| 573 | rcu_read_lock(); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 574 | write_al_updates = rcu_dereference(device->ldev->disk_conf)->al_updates; |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 575 | rcu_read_unlock(); |
| 576 | if (write_al_updates) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 577 | if (drbd_md_sync_page_io(device, device->ldev, sector, WRITE)) { |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 578 | err = -EIO; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 579 | drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR); |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 580 | } else { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 581 | device->al_tr_number++; |
| 582 | device->al_writ_cnt++; |
Lars Ellenberg | b5bc8e0 | 2013-03-19 18:16:52 +0100 | [diff] [blame] | 583 | } |
| 584 | } |
Lars Ellenberg | 7ad651b | 2011-02-21 13:21:03 +0100 | [diff] [blame] | 585 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 586 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 587 | drbd_md_put_buffer(device); |
| 588 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 589 | |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 590 | return err; |
| 591 | } |
| 592 | |
| 593 | |
| 594 | static int w_al_write_transaction(struct drbd_work *w, int unused) |
| 595 | { |
| 596 | struct update_al_work *aw = container_of(w, struct update_al_work, w); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 597 | struct drbd_device *device = aw->device; |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 598 | int err; |
| 599 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 600 | err = _al_write_transaction(device); |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 601 | aw->err = err; |
| 602 | complete(&aw->event); |
| 603 | |
| 604 | return err != -EIO ? err : 0; |
| 605 | } |
| 606 | |
| 607 | /* Calls from worker context (see w_restart_disk_io()) need to write the |
| 608 | transaction directly. Others came through generic_make_request(), |
| 609 | those need to delegate it to the worker. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 610 | static int al_write_transaction(struct drbd_device *device, bool delegate) |
Philipp Reisner | 1b7ab15 | 2011-07-15 17:19:02 +0200 | [diff] [blame] | 611 | { |
Lars Ellenberg | 56392d2 | 2013-03-19 18:16:48 +0100 | [diff] [blame] | 612 | if (delegate) { |
| 613 | struct update_al_work al_work; |
| 614 | init_completion(&al_work.event); |
| 615 | al_work.w.cb = w_al_write_transaction; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 616 | al_work.device = device; |
| 617 | drbd_queue_work_front(&first_peer_device(device)->connection->sender_work, |
| 618 | &al_work.w); |
Lars Ellenberg | 56392d2 | 2013-03-19 18:16:48 +0100 | [diff] [blame] | 619 | wait_for_completion(&al_work.event); |
| 620 | return al_work.err; |
| 621 | } else |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 622 | return _al_write_transaction(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 623 | } |
| 624 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 625 | static int _try_lc_del(struct drbd_device *device, struct lc_element *al_ext) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 626 | { |
| 627 | int rv; |
| 628 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 629 | spin_lock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 630 | rv = (al_ext->refcnt == 0); |
| 631 | if (likely(rv)) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 632 | lc_del(device->act_log, al_ext); |
| 633 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 634 | |
| 635 | return rv; |
| 636 | } |
| 637 | |
| 638 | /** |
| 639 | * drbd_al_shrink() - Removes all active extents form the activity log |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 640 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 641 | * |
| 642 | * Removes all active extents form the activity log, waiting until |
| 643 | * the reference count of each entry dropped to 0 first, of course. |
| 644 | * |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 645 | * You need to lock device->act_log with lc_try_lock() / lc_unlock() |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 646 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 647 | void drbd_al_shrink(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 648 | { |
| 649 | struct lc_element *al_ext; |
| 650 | int i; |
| 651 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 652 | D_ASSERT(device, test_bit(__LC_LOCKED, &device->act_log->flags)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 653 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 654 | for (i = 0; i < device->act_log->nr_elements; i++) { |
| 655 | al_ext = lc_element_by_index(device->act_log, i); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 656 | if (al_ext->lc_number == LC_FREE) |
| 657 | continue; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 658 | wait_event(device->al_wait, _try_lc_del(device, al_ext)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 659 | } |
| 660 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 661 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 662 | } |
| 663 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 664 | int drbd_initialize_al(struct drbd_device *device, void *buffer) |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 665 | { |
| 666 | struct al_transaction_on_disk *al = buffer; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 667 | struct drbd_md *md = &device->ldev->md; |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 668 | sector_t al_base = md->md_offset + md->al_offset; |
| 669 | int al_size_4k = md->al_stripes * md->al_stripe_size_4k; |
| 670 | int i; |
| 671 | |
| 672 | memset(al, 0, 4096); |
| 673 | al->magic = cpu_to_be32(DRBD_AL_MAGIC); |
| 674 | al->transaction_type = cpu_to_be16(AL_TR_INITIALIZED); |
| 675 | al->crc32c = cpu_to_be32(crc32c(0, al, 4096)); |
| 676 | |
| 677 | for (i = 0; i < al_size_4k; i++) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 678 | int err = drbd_md_sync_page_io(device, device->ldev, al_base + i * 8, WRITE); |
Philipp Reisner | d752b26 | 2013-06-25 16:50:08 +0200 | [diff] [blame] | 679 | if (err) |
| 680 | return err; |
| 681 | } |
| 682 | return 0; |
| 683 | } |
| 684 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 685 | static int w_update_odbm(struct drbd_work *w, int unused) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 686 | { |
| 687 | struct update_odbm_work *udw = container_of(w, struct update_odbm_work, w); |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 688 | struct drbd_device *device = udw->device; |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 689 | struct sib_info sib = { .sib_reason = SIB_SYNC_PROGRESS, }; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 690 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 691 | if (!get_ldev(device)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 692 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 693 | drbd_warn(device, "Can not update on disk bitmap, local IO disabled.\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 694 | kfree(udw); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 695 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 696 | } |
| 697 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 698 | drbd_bm_write_page(device, rs_extent_to_bm_page(udw->enr)); |
| 699 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 700 | |
| 701 | kfree(udw); |
| 702 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 703 | if (drbd_bm_total_weight(device) <= device->rs_failed) { |
| 704 | switch (device->state.conn) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 705 | case C_SYNC_SOURCE: case C_SYNC_TARGET: |
| 706 | case C_PAUSED_SYNC_S: case C_PAUSED_SYNC_T: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 707 | drbd_resync_finished(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 708 | default: |
| 709 | /* nothing to do */ |
| 710 | break; |
| 711 | } |
| 712 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 713 | drbd_bcast_event(device, &sib); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 714 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 715 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | |
| 719 | /* ATTENTION. The AL's extents are 4MB each, while the extents in the |
| 720 | * resync LRU-cache are 16MB each. |
| 721 | * The caller of this function has to hold an get_ldev() reference. |
| 722 | * |
| 723 | * TODO will be obsoleted once we have a caching lru of the on disk bitmap |
| 724 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 725 | static void drbd_try_clear_on_disk_bm(struct drbd_device *device, sector_t sector, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 726 | int count, int success) |
| 727 | { |
| 728 | struct lc_element *e; |
| 729 | struct update_odbm_work *udw; |
| 730 | |
| 731 | unsigned int enr; |
| 732 | |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 733 | D_ASSERT(device, atomic_read(&device->local_cnt)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 734 | |
| 735 | /* I simply assume that a sector/size pair never crosses |
| 736 | * a 16 MB extent border. (Currently this is true...) */ |
| 737 | enr = BM_SECT_TO_EXT(sector); |
| 738 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 739 | e = lc_get(device->resync, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 740 | if (e) { |
| 741 | struct bm_extent *ext = lc_entry(e, struct bm_extent, lce); |
| 742 | if (ext->lce.lc_number == enr) { |
| 743 | if (success) |
| 744 | ext->rs_left -= count; |
| 745 | else |
| 746 | ext->rs_failed += count; |
| 747 | if (ext->rs_left < ext->rs_failed) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 748 | drbd_warn(device, "BAD! sector=%llus enr=%u rs_left=%d " |
Philipp Reisner | 975b297 | 2011-11-17 10:11:47 +0100 | [diff] [blame] | 749 | "rs_failed=%d count=%d cstate=%s\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 750 | (unsigned long long)sector, |
| 751 | ext->lce.lc_number, ext->rs_left, |
Philipp Reisner | 975b297 | 2011-11-17 10:11:47 +0100 | [diff] [blame] | 752 | ext->rs_failed, count, |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 753 | drbd_conn_str(device->state.conn)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 754 | |
Philipp Reisner | 975b297 | 2011-11-17 10:11:47 +0100 | [diff] [blame] | 755 | /* We don't expect to be able to clear more bits |
| 756 | * than have been set when we originally counted |
| 757 | * the set bits to cache that value in ext->rs_left. |
| 758 | * Whatever the reason (disconnect during resync, |
| 759 | * delayed local completion of an application write), |
| 760 | * try to fix it up by recounting here. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 761 | ext->rs_left = drbd_bm_e_weight(device, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 762 | } |
| 763 | } else { |
| 764 | /* Normally this element should be in the cache, |
| 765 | * since drbd_rs_begin_io() pulled it already in. |
| 766 | * |
| 767 | * But maybe an application write finished, and we set |
| 768 | * something outside the resync lru_cache in sync. |
| 769 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 770 | int rs_left = drbd_bm_e_weight(device, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 771 | if (ext->flags != 0) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 772 | drbd_warn(device, "changing resync lce: %d[%u;%02lx]" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 773 | " -> %d[%u;00]\n", |
| 774 | ext->lce.lc_number, ext->rs_left, |
| 775 | ext->flags, enr, rs_left); |
| 776 | ext->flags = 0; |
| 777 | } |
| 778 | if (ext->rs_failed) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 779 | drbd_warn(device, "Kicking resync_lru element enr=%u " |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 780 | "out with rs_failed=%d\n", |
| 781 | ext->lce.lc_number, ext->rs_failed); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 782 | } |
| 783 | ext->rs_left = rs_left; |
| 784 | ext->rs_failed = success ? 0 : count; |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 785 | /* we don't keep a persistent log of the resync lru, |
| 786 | * we can commit any change right away. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 787 | lc_committed(device->resync); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 788 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 789 | lc_put(device->resync, &ext->lce); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 790 | /* no race, we are within the al_lock! */ |
| 791 | |
| 792 | if (ext->rs_left == ext->rs_failed) { |
| 793 | ext->rs_failed = 0; |
| 794 | |
| 795 | udw = kmalloc(sizeof(*udw), GFP_ATOMIC); |
| 796 | if (udw) { |
| 797 | udw->enr = ext->lce.lc_number; |
| 798 | udw->w.cb = w_update_odbm; |
Andreas Gruenbacher | 84b8c06 | 2011-07-28 15:27:51 +0200 | [diff] [blame] | 799 | udw->device = device; |
| 800 | drbd_queue_work_front(&first_peer_device(device)->connection->sender_work, |
| 801 | &udw->w); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 802 | } else { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 803 | drbd_warn(device, "Could not kmalloc an udw\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 804 | } |
| 805 | } |
| 806 | } else { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 807 | drbd_err(device, "lc_get() failed! locked=%d/%d flags=%lu\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 808 | device->resync_locked, |
| 809 | device->resync->nr_elements, |
| 810 | device->resync->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 811 | } |
| 812 | } |
| 813 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 814 | void drbd_advance_rs_marks(struct drbd_device *device, unsigned long still_to_go) |
Lars Ellenberg | c6ea14d | 2010-11-05 09:23:37 +0100 | [diff] [blame] | 815 | { |
| 816 | unsigned long now = jiffies; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 817 | unsigned long last = device->rs_mark_time[device->rs_last_mark]; |
| 818 | int next = (device->rs_last_mark + 1) % DRBD_SYNC_MARKS; |
Lars Ellenberg | c6ea14d | 2010-11-05 09:23:37 +0100 | [diff] [blame] | 819 | if (time_after_eq(now, last + DRBD_SYNC_MARK_STEP)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 820 | if (device->rs_mark_left[device->rs_last_mark] != still_to_go && |
| 821 | device->state.conn != C_PAUSED_SYNC_T && |
| 822 | device->state.conn != C_PAUSED_SYNC_S) { |
| 823 | device->rs_mark_time[next] = now; |
| 824 | device->rs_mark_left[next] = still_to_go; |
| 825 | device->rs_last_mark = next; |
Lars Ellenberg | c6ea14d | 2010-11-05 09:23:37 +0100 | [diff] [blame] | 826 | } |
| 827 | } |
| 828 | } |
| 829 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 830 | /* clear the bit corresponding to the piece of storage in question: |
| 831 | * size byte of data starting from sector. Only clear a bits of the affected |
| 832 | * one ore more _aligned_ BM_BLOCK_SIZE blocks. |
| 833 | * |
| 834 | * called by worker on C_SYNC_TARGET and receiver on SyncSource. |
| 835 | * |
| 836 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 837 | void __drbd_set_in_sync(struct drbd_device *device, sector_t sector, int size, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 838 | const char *file, const unsigned int line) |
| 839 | { |
| 840 | /* Is called from worker and receiver context _only_ */ |
| 841 | unsigned long sbnr, ebnr, lbnr; |
| 842 | unsigned long count = 0; |
| 843 | sector_t esector, nr_sectors; |
| 844 | int wake_up = 0; |
| 845 | unsigned long flags; |
| 846 | |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 847 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_DISCARD_SIZE) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 848 | drbd_err(device, "drbd_set_in_sync: sector=%llus size=%d nonsense!\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 849 | (unsigned long long)sector, size); |
| 850 | return; |
| 851 | } |
Philipp Reisner | 518a4d5 | 2012-10-19 14:21:22 +0200 | [diff] [blame] | 852 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 853 | if (!get_ldev(device)) |
Philipp Reisner | 518a4d5 | 2012-10-19 14:21:22 +0200 | [diff] [blame] | 854 | return; /* no disk, no metadata, no bitmap to clear bits in */ |
| 855 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 856 | nr_sectors = drbd_get_capacity(device->this_bdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 857 | esector = sector + (size >> 9) - 1; |
| 858 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 859 | if (!expect(sector < nr_sectors)) |
Philipp Reisner | 518a4d5 | 2012-10-19 14:21:22 +0200 | [diff] [blame] | 860 | goto out; |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 861 | if (!expect(esector < nr_sectors)) |
| 862 | esector = nr_sectors - 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 863 | |
| 864 | lbnr = BM_SECT_TO_BIT(nr_sectors-1); |
| 865 | |
| 866 | /* we clear it (in sync). |
| 867 | * round up start sector, round down end sector. we make sure we only |
| 868 | * clear full, aligned, BM_BLOCK_SIZE (4K) blocks */ |
| 869 | if (unlikely(esector < BM_SECT_PER_BIT-1)) |
Philipp Reisner | 518a4d5 | 2012-10-19 14:21:22 +0200 | [diff] [blame] | 870 | goto out; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 871 | if (unlikely(esector == (nr_sectors-1))) |
| 872 | ebnr = lbnr; |
| 873 | else |
| 874 | ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1)); |
| 875 | sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1); |
| 876 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 877 | if (sbnr > ebnr) |
Philipp Reisner | 518a4d5 | 2012-10-19 14:21:22 +0200 | [diff] [blame] | 878 | goto out; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 879 | |
| 880 | /* |
| 881 | * ok, (capacity & 7) != 0 sometimes, but who cares... |
| 882 | * we count rs_{total,left} in bits, not sectors. |
| 883 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 884 | count = drbd_bm_clear_bits(device, sbnr, ebnr); |
Philipp Reisner | 518a4d5 | 2012-10-19 14:21:22 +0200 | [diff] [blame] | 885 | if (count) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 886 | drbd_advance_rs_marks(device, drbd_bm_total_weight(device)); |
| 887 | spin_lock_irqsave(&device->al_lock, flags); |
| 888 | drbd_try_clear_on_disk_bm(device, sector, count, true); |
| 889 | spin_unlock_irqrestore(&device->al_lock, flags); |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 890 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 891 | /* just wake_up unconditional now, various lc_chaged(), |
| 892 | * lc_put() in drbd_try_clear_on_disk_bm(). */ |
| 893 | wake_up = 1; |
| 894 | } |
Philipp Reisner | 518a4d5 | 2012-10-19 14:21:22 +0200 | [diff] [blame] | 895 | out: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 896 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 897 | if (wake_up) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 898 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | /* |
| 902 | * this is intended to set one request worth of data out of sync. |
| 903 | * affects at least 1 bit, |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 904 | * and at most 1+DRBD_MAX_BIO_SIZE/BM_BLOCK_SIZE bits. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 905 | * |
| 906 | * called by tl_clear and drbd_send_dblock (==drbd_make_request). |
| 907 | * so this can be _any_ process. |
| 908 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 909 | int __drbd_set_out_of_sync(struct drbd_device *device, sector_t sector, int size, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 910 | const char *file, const unsigned int line) |
| 911 | { |
Philipp Reisner | 376694a | 2011-11-07 10:54:28 +0100 | [diff] [blame] | 912 | unsigned long sbnr, ebnr, flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 913 | sector_t esector, nr_sectors; |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 914 | unsigned int enr, count = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 915 | struct lc_element *e; |
| 916 | |
Lars Ellenberg | 81a3537 | 2012-07-30 09:00:54 +0200 | [diff] [blame] | 917 | /* this should be an empty REQ_FLUSH */ |
| 918 | if (size == 0) |
| 919 | return 0; |
| 920 | |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 921 | if (size < 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_DISCARD_SIZE) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 922 | drbd_err(device, "sector: %llus, size: %d\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 923 | (unsigned long long)sector, size); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 924 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 925 | } |
| 926 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 927 | if (!get_ldev(device)) |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 928 | return 0; /* no disk, no metadata, no bitmap to set bits in */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 929 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 930 | nr_sectors = drbd_get_capacity(device->this_bdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 931 | esector = sector + (size >> 9) - 1; |
| 932 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 933 | if (!expect(sector < nr_sectors)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 934 | goto out; |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 935 | if (!expect(esector < nr_sectors)) |
| 936 | esector = nr_sectors - 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 937 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 938 | /* we set it out of sync, |
| 939 | * we do not need to round anything here */ |
| 940 | sbnr = BM_SECT_TO_BIT(sector); |
| 941 | ebnr = BM_SECT_TO_BIT(esector); |
| 942 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 943 | /* ok, (capacity & 7) != 0 sometimes, but who cares... |
| 944 | * we count rs_{total,left} in bits, not sectors. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 945 | spin_lock_irqsave(&device->al_lock, flags); |
| 946 | count = drbd_bm_set_bits(device, sbnr, ebnr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 947 | |
| 948 | enr = BM_SECT_TO_EXT(sector); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 949 | e = lc_find(device->resync, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 950 | if (e) |
| 951 | lc_entry(e, struct bm_extent, lce)->rs_left += count; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 952 | spin_unlock_irqrestore(&device->al_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 953 | |
| 954 | out: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 955 | put_ldev(device); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 956 | |
| 957 | return count; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 958 | } |
| 959 | |
| 960 | static |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 961 | struct bm_extent *_bme_get(struct drbd_device *device, unsigned int enr) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 962 | { |
| 963 | struct lc_element *e; |
| 964 | struct bm_extent *bm_ext; |
| 965 | int wakeup = 0; |
| 966 | unsigned long rs_flags; |
| 967 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 968 | spin_lock_irq(&device->al_lock); |
| 969 | if (device->resync_locked > device->resync->nr_elements/2) { |
| 970 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 971 | return NULL; |
| 972 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 973 | e = lc_get(device->resync, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 974 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 975 | if (bm_ext) { |
| 976 | if (bm_ext->lce.lc_number != enr) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 977 | bm_ext->rs_left = drbd_bm_e_weight(device, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 978 | bm_ext->rs_failed = 0; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 979 | lc_committed(device->resync); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 980 | wakeup = 1; |
| 981 | } |
| 982 | if (bm_ext->lce.refcnt == 1) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 983 | device->resync_locked++; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 984 | set_bit(BME_NO_WRITES, &bm_ext->flags); |
| 985 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 986 | rs_flags = device->resync->flags; |
| 987 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 988 | if (wakeup) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 989 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 990 | |
| 991 | if (!bm_ext) { |
| 992 | if (rs_flags & LC_STARVING) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 993 | drbd_warn(device, "Have to wait for element" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 994 | " (resync LRU too small?)\n"); |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 995 | BUG_ON(rs_flags & LC_LOCKED); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | return bm_ext; |
| 999 | } |
| 1000 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1001 | static int _is_in_al(struct drbd_device *device, unsigned int enr) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1002 | { |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 1003 | int rv; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1004 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1005 | spin_lock_irq(&device->al_lock); |
| 1006 | rv = lc_is_used(device->act_log, enr); |
| 1007 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1008 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1009 | return rv; |
| 1010 | } |
| 1011 | |
| 1012 | /** |
| 1013 | * drbd_rs_begin_io() - Gets an extent in the resync LRU cache and sets it to BME_LOCKED |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1014 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1015 | * @sector: The sector number. |
| 1016 | * |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1017 | * 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] | 1018 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1019 | int drbd_rs_begin_io(struct drbd_device *device, sector_t sector) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1020 | { |
| 1021 | unsigned int enr = BM_SECT_TO_EXT(sector); |
| 1022 | struct bm_extent *bm_ext; |
| 1023 | int i, sig; |
Lars Ellenberg | e829987 | 2014-04-28 18:43:19 +0200 | [diff] [blame] | 1024 | bool sa; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1025 | |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1026 | retry: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1027 | sig = wait_event_interruptible(device->al_wait, |
| 1028 | (bm_ext = _bme_get(device, enr))); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1029 | if (sig) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1030 | return -EINTR; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1031 | |
| 1032 | if (test_bit(BME_LOCKED, &bm_ext->flags)) |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1033 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1034 | |
Lars Ellenberg | e829987 | 2014-04-28 18:43:19 +0200 | [diff] [blame] | 1035 | /* step aside only while we are above c-min-rate; unless disabled. */ |
| 1036 | sa = drbd_rs_c_min_rate_throttle(device); |
| 1037 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1038 | for (i = 0; i < AL_EXT_PER_BM_SECT; i++) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1039 | sig = wait_event_interruptible(device->al_wait, |
| 1040 | !_is_in_al(device, enr * AL_EXT_PER_BM_SECT + i) || |
Lars Ellenberg | e829987 | 2014-04-28 18:43:19 +0200 | [diff] [blame] | 1041 | (sa && test_bit(BME_PRIORITY, &bm_ext->flags))); |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1042 | |
Lars Ellenberg | e829987 | 2014-04-28 18:43:19 +0200 | [diff] [blame] | 1043 | if (sig || (sa && test_bit(BME_PRIORITY, &bm_ext->flags))) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1044 | spin_lock_irq(&device->al_lock); |
| 1045 | if (lc_put(device->resync, &bm_ext->lce) == 0) { |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1046 | bm_ext->flags = 0; /* clears BME_NO_WRITES and eventually BME_PRIORITY */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1047 | device->resync_locked--; |
| 1048 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1049 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1050 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1051 | if (sig) |
| 1052 | return -EINTR; |
| 1053 | if (schedule_timeout_interruptible(HZ/10)) |
| 1054 | return -EINTR; |
Philipp Reisner | f91ab62 | 2010-11-09 13:59:41 +0100 | [diff] [blame] | 1055 | goto retry; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1056 | } |
| 1057 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1058 | set_bit(BME_LOCKED, &bm_ext->flags); |
Lars Ellenberg | 80a40e4 | 2010-08-11 23:28:00 +0200 | [diff] [blame] | 1059 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1060 | } |
| 1061 | |
| 1062 | /** |
| 1063 | * drbd_try_rs_begin_io() - Gets an extent in the resync LRU cache, does not sleep |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1064 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1065 | * @sector: The sector number. |
| 1066 | * |
| 1067 | * Gets an extent in the resync LRU cache, sets it to BME_NO_WRITES, then |
| 1068 | * tries to set it to BME_LOCKED. Returns 0 upon success, and -EAGAIN |
| 1069 | * if there is still application IO going on in this area. |
| 1070 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1071 | int drbd_try_rs_begin_io(struct drbd_device *device, sector_t sector) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1072 | { |
| 1073 | unsigned int enr = BM_SECT_TO_EXT(sector); |
| 1074 | const unsigned int al_enr = enr*AL_EXT_PER_BM_SECT; |
| 1075 | struct lc_element *e; |
| 1076 | struct bm_extent *bm_ext; |
| 1077 | int i; |
| 1078 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1079 | spin_lock_irq(&device->al_lock); |
| 1080 | if (device->resync_wenr != LC_FREE && device->resync_wenr != enr) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1081 | /* in case you have very heavy scattered io, it may |
| 1082 | * stall the syncer undefined if we give up the ref count |
| 1083 | * when we try again and requeue. |
| 1084 | * |
| 1085 | * if we don't give up the refcount, but the next time |
| 1086 | * we are scheduled this extent has been "synced" by new |
| 1087 | * application writes, we'd miss the lc_put on the |
| 1088 | * extent we keep the refcount on. |
| 1089 | * so we remembered which extent we had to try again, and |
| 1090 | * if the next requested one is something else, we do |
| 1091 | * the lc_put here... |
| 1092 | * we also have to wake_up |
| 1093 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1094 | e = lc_find(device->resync, device->resync_wenr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1095 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1096 | if (bm_ext) { |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1097 | D_ASSERT(device, !test_bit(BME_LOCKED, &bm_ext->flags)); |
| 1098 | D_ASSERT(device, test_bit(BME_NO_WRITES, &bm_ext->flags)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1099 | clear_bit(BME_NO_WRITES, &bm_ext->flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1100 | device->resync_wenr = LC_FREE; |
| 1101 | if (lc_put(device->resync, &bm_ext->lce) == 0) |
| 1102 | device->resync_locked--; |
| 1103 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1104 | } else { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1105 | drbd_alert(device, "LOGIC BUG\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1106 | } |
| 1107 | } |
| 1108 | /* TRY. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1109 | e = lc_try_get(device->resync, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1110 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1111 | if (bm_ext) { |
| 1112 | if (test_bit(BME_LOCKED, &bm_ext->flags)) |
| 1113 | goto proceed; |
| 1114 | if (!test_and_set_bit(BME_NO_WRITES, &bm_ext->flags)) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1115 | device->resync_locked++; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1116 | } else { |
| 1117 | /* we did set the BME_NO_WRITES, |
| 1118 | * but then could not set BME_LOCKED, |
| 1119 | * so we tried again. |
| 1120 | * drop the extra reference. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1121 | bm_ext->lce.refcnt--; |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1122 | D_ASSERT(device, bm_ext->lce.refcnt > 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1123 | } |
| 1124 | goto check_al; |
| 1125 | } else { |
| 1126 | /* do we rather want to try later? */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1127 | if (device->resync_locked > device->resync->nr_elements-3) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1128 | goto try_again; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1129 | /* Do or do not. There is no try. -- Yoda */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1130 | e = lc_get(device->resync, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1131 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1132 | if (!bm_ext) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1133 | const unsigned long rs_flags = device->resync->flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1134 | if (rs_flags & LC_STARVING) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1135 | drbd_warn(device, "Have to wait for element" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1136 | " (resync LRU too small?)\n"); |
Lars Ellenberg | 46a15bc | 2011-02-21 13:21:01 +0100 | [diff] [blame] | 1137 | BUG_ON(rs_flags & LC_LOCKED); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1138 | goto try_again; |
| 1139 | } |
| 1140 | if (bm_ext->lce.lc_number != enr) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1141 | bm_ext->rs_left = drbd_bm_e_weight(device, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1142 | bm_ext->rs_failed = 0; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1143 | lc_committed(device->resync); |
| 1144 | wake_up(&device->al_wait); |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1145 | D_ASSERT(device, test_bit(BME_LOCKED, &bm_ext->flags) == 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1146 | } |
| 1147 | set_bit(BME_NO_WRITES, &bm_ext->flags); |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1148 | D_ASSERT(device, bm_ext->lce.refcnt == 1); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1149 | device->resync_locked++; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1150 | goto check_al; |
| 1151 | } |
| 1152 | check_al: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1153 | for (i = 0; i < AL_EXT_PER_BM_SECT; i++) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1154 | if (lc_is_used(device->act_log, al_enr+i)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1155 | goto try_again; |
| 1156 | } |
| 1157 | set_bit(BME_LOCKED, &bm_ext->flags); |
| 1158 | proceed: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1159 | device->resync_wenr = LC_FREE; |
| 1160 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1161 | return 0; |
| 1162 | |
| 1163 | try_again: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1164 | if (bm_ext) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1165 | device->resync_wenr = enr; |
| 1166 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1167 | return -EAGAIN; |
| 1168 | } |
| 1169 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1170 | void drbd_rs_complete_io(struct drbd_device *device, sector_t sector) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1171 | { |
| 1172 | unsigned int enr = BM_SECT_TO_EXT(sector); |
| 1173 | struct lc_element *e; |
| 1174 | struct bm_extent *bm_ext; |
| 1175 | unsigned long flags; |
| 1176 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1177 | spin_lock_irqsave(&device->al_lock, flags); |
| 1178 | e = lc_find(device->resync, enr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1179 | bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL; |
| 1180 | if (!bm_ext) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1181 | spin_unlock_irqrestore(&device->al_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1182 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1183 | drbd_err(device, "drbd_rs_complete_io() called, but extent not found\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1184 | return; |
| 1185 | } |
| 1186 | |
| 1187 | if (bm_ext->lce.refcnt == 0) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1188 | spin_unlock_irqrestore(&device->al_lock, flags); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1189 | drbd_err(device, "drbd_rs_complete_io(,%llu [=%u]) called, " |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1190 | "but refcnt is 0!?\n", |
| 1191 | (unsigned long long)sector, enr); |
| 1192 | return; |
| 1193 | } |
| 1194 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1195 | if (lc_put(device->resync, &bm_ext->lce) == 0) { |
Philipp Reisner | e3555d8 | 2010-11-07 15:56:29 +0100 | [diff] [blame] | 1196 | bm_ext->flags = 0; /* clear BME_LOCKED, BME_NO_WRITES and BME_PRIORITY */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1197 | device->resync_locked--; |
| 1198 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1199 | } |
| 1200 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1201 | spin_unlock_irqrestore(&device->al_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | /** |
| 1205 | * drbd_rs_cancel_all() - Removes all extents from the resync LRU (even BME_LOCKED) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1206 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1207 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1208 | void drbd_rs_cancel_all(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1209 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1210 | spin_lock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1211 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1212 | if (get_ldev_if_state(device, D_FAILED)) { /* Makes sure ->resync is there. */ |
| 1213 | lc_reset(device->resync); |
| 1214 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1215 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1216 | device->resync_locked = 0; |
| 1217 | device->resync_wenr = LC_FREE; |
| 1218 | spin_unlock_irq(&device->al_lock); |
| 1219 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1220 | } |
| 1221 | |
| 1222 | /** |
| 1223 | * drbd_rs_del_all() - Gracefully remove all extents from the resync LRU |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1224 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1225 | * |
| 1226 | * Returns 0 upon success, -EAGAIN if at least one reference count was |
| 1227 | * not zero. |
| 1228 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1229 | int drbd_rs_del_all(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1230 | { |
| 1231 | struct lc_element *e; |
| 1232 | struct bm_extent *bm_ext; |
| 1233 | int i; |
| 1234 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1235 | spin_lock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1236 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1237 | if (get_ldev_if_state(device, D_FAILED)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1238 | /* ok, ->resync is there. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1239 | for (i = 0; i < device->resync->nr_elements; i++) { |
| 1240 | e = lc_element_by_index(device->resync, i); |
Philipp Reisner | b2b163d | 2010-04-02 08:40:33 +0200 | [diff] [blame] | 1241 | bm_ext = lc_entry(e, struct bm_extent, lce); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1242 | if (bm_ext->lce.lc_number == LC_FREE) |
| 1243 | continue; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1244 | if (bm_ext->lce.lc_number == device->resync_wenr) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1245 | drbd_info(device, "dropping %u in drbd_rs_del_all, apparently" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1246 | " got 'synced' by application io\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1247 | device->resync_wenr); |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1248 | D_ASSERT(device, !test_bit(BME_LOCKED, &bm_ext->flags)); |
| 1249 | D_ASSERT(device, test_bit(BME_NO_WRITES, &bm_ext->flags)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1250 | clear_bit(BME_NO_WRITES, &bm_ext->flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1251 | device->resync_wenr = LC_FREE; |
| 1252 | lc_put(device->resync, &bm_ext->lce); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1253 | } |
| 1254 | if (bm_ext->lce.refcnt != 0) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1255 | drbd_info(device, "Retrying drbd_rs_del_all() later. " |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1256 | "refcnt=%d\n", bm_ext->lce.refcnt); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1257 | put_ldev(device); |
| 1258 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1259 | return -EAGAIN; |
| 1260 | } |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1261 | D_ASSERT(device, !test_bit(BME_LOCKED, &bm_ext->flags)); |
| 1262 | D_ASSERT(device, !test_bit(BME_NO_WRITES, &bm_ext->flags)); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1263 | lc_del(device->resync, &bm_ext->lce); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1264 | } |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 1265 | D_ASSERT(device, device->resync->used == 0); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1266 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1267 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1268 | spin_unlock_irq(&device->al_lock); |
| 1269 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1270 | |
| 1271 | return 0; |
| 1272 | } |
| 1273 | |
| 1274 | /** |
| 1275 | * drbd_rs_failed_io() - Record information on a failure to resync the specified blocks |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1276 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1277 | * @sector: The sector number. |
| 1278 | * @size: Size of failed IO operation, in byte. |
| 1279 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1280 | void drbd_rs_failed_io(struct drbd_device *device, sector_t sector, int size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1281 | { |
| 1282 | /* Is called from worker and receiver context _only_ */ |
| 1283 | unsigned long sbnr, ebnr, lbnr; |
| 1284 | unsigned long count; |
| 1285 | sector_t esector, nr_sectors; |
| 1286 | int wake_up = 0; |
| 1287 | |
Lars Ellenberg | a0fb3c4 | 2014-04-28 18:43:23 +0200 | [diff] [blame] | 1288 | if (size <= 0 || !IS_ALIGNED(size, 512) || size > DRBD_MAX_DISCARD_SIZE) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1289 | drbd_err(device, "drbd_rs_failed_io: sector=%llus size=%d nonsense!\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1290 | (unsigned long long)sector, size); |
| 1291 | return; |
| 1292 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1293 | nr_sectors = drbd_get_capacity(device->this_bdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1294 | esector = sector + (size >> 9) - 1; |
| 1295 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1296 | if (!expect(sector < nr_sectors)) |
| 1297 | return; |
| 1298 | if (!expect(esector < nr_sectors)) |
| 1299 | esector = nr_sectors - 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1300 | |
| 1301 | lbnr = BM_SECT_TO_BIT(nr_sectors-1); |
| 1302 | |
| 1303 | /* |
| 1304 | * round up start sector, round down end sector. we make sure we only |
| 1305 | * handle full, aligned, BM_BLOCK_SIZE (4K) blocks */ |
| 1306 | if (unlikely(esector < BM_SECT_PER_BIT-1)) |
| 1307 | return; |
| 1308 | if (unlikely(esector == (nr_sectors-1))) |
| 1309 | ebnr = lbnr; |
| 1310 | else |
| 1311 | ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1)); |
| 1312 | sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1); |
| 1313 | |
| 1314 | if (sbnr > ebnr) |
| 1315 | return; |
| 1316 | |
| 1317 | /* |
| 1318 | * ok, (capacity & 7) != 0 sometimes, but who cares... |
| 1319 | * we count rs_{total,left} in bits, not sectors. |
| 1320 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1321 | spin_lock_irq(&device->al_lock); |
| 1322 | count = drbd_bm_count_bits(device, sbnr, ebnr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1323 | if (count) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1324 | device->rs_failed += count; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1325 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1326 | if (get_ldev(device)) { |
| 1327 | drbd_try_clear_on_disk_bm(device, sector, count, false); |
| 1328 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | /* just wake_up unconditional now, various lc_chaged(), |
| 1332 | * lc_put() in drbd_try_clear_on_disk_bm(). */ |
| 1333 | wake_up = 1; |
| 1334 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1335 | spin_unlock_irq(&device->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1336 | if (wake_up) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1337 | wake_up(&device->al_wait); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1338 | } |