Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | drbd_bitmap.c |
| 3 | |
| 4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| 5 | |
| 6 | Copyright (C) 2004-2008, LINBIT Information Technologies GmbH. |
| 7 | Copyright (C) 2004-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| 8 | Copyright (C) 2004-2008, 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 | |
Lars Ellenberg | f88c5d9 | 2014-03-27 14:10:55 +0100 | [diff] [blame] | 25 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 26 | |
Lars Ellenberg | 5fb3bc4 | 2015-03-20 16:15:24 +0100 | [diff] [blame^] | 27 | #include <linux/bitmap.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 28 | #include <linux/vmalloc.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/drbd.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 31 | #include <linux/slab.h> |
Christoph Hellwig | dbcbdc4 | 2015-08-28 09:27:17 +0200 | [diff] [blame] | 32 | #include <linux/highmem.h> |
Stephen Rothwell | f0ff135 | 2011-03-17 15:02:51 +0100 | [diff] [blame] | 33 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 34 | #include "drbd_int.h" |
| 35 | |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 36 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 37 | /* OPAQUE outside this file! |
| 38 | * interface defined in drbd_int.h |
| 39 | |
| 40 | * convention: |
| 41 | * function name drbd_bm_... => used elsewhere, "public". |
| 42 | * function name bm_... => internal to implementation, "private". |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 43 | */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 44 | |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 45 | |
| 46 | /* |
| 47 | * LIMITATIONS: |
| 48 | * We want to support >= peta byte of backend storage, while for now still using |
| 49 | * a granularity of one bit per 4KiB of storage. |
| 50 | * 1 << 50 bytes backend storage (1 PiB) |
| 51 | * 1 << (50 - 12) bits needed |
| 52 | * 38 --> we need u64 to index and count bits |
| 53 | * 1 << (38 - 3) bitmap bytes needed |
| 54 | * 35 --> we still need u64 to index and count bytes |
| 55 | * (that's 32 GiB of bitmap for 1 PiB storage) |
| 56 | * 1 << (35 - 2) 32bit longs needed |
| 57 | * 33 --> we'd even need u64 to index and count 32bit long words. |
| 58 | * 1 << (35 - 3) 64bit longs needed |
| 59 | * 32 --> we could get away with a 32bit unsigned int to index and count |
| 60 | * 64bit long words, but I rather stay with unsigned long for now. |
| 61 | * We probably should neither count nor point to bytes or long words |
| 62 | * directly, but either by bitnumber, or by page index and offset. |
| 63 | * 1 << (35 - 12) |
| 64 | * 22 --> we need that much 4KiB pages of bitmap. |
| 65 | * 1 << (22 + 3) --> on a 64bit arch, |
| 66 | * we need 32 MiB to store the array of page pointers. |
| 67 | * |
| 68 | * Because I'm lazy, and because the resulting patch was too large, too ugly |
| 69 | * and still incomplete, on 32bit we still "only" support 16 TiB (minus some), |
| 70 | * (1 << 32) bits * 4k storage. |
| 71 | * |
| 72 | |
| 73 | * bitmap storage and IO: |
| 74 | * Bitmap is stored little endian on disk, and is kept little endian in |
| 75 | * core memory. Currently we still hold the full bitmap in core as long |
| 76 | * as we are "attached" to a local disk, which at 32 GiB for 1PiB storage |
| 77 | * seems excessive. |
| 78 | * |
Bart Van Assche | 24c4830 | 2011-05-21 18:32:29 +0200 | [diff] [blame] | 79 | * We plan to reduce the amount of in-core bitmap pages by paging them in |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 80 | * and out against their on-disk location as necessary, but need to make |
| 81 | * sure we don't cause too much meta data IO, and must not deadlock in |
| 82 | * tight memory situations. This needs some more work. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 83 | */ |
| 84 | |
| 85 | /* |
| 86 | * NOTE |
| 87 | * Access to the *bm_pages is protected by bm_lock. |
| 88 | * It is safe to read the other members within the lock. |
| 89 | * |
| 90 | * drbd_bm_set_bits is called from bio_endio callbacks, |
| 91 | * We may be called with irq already disabled, |
| 92 | * so we need spin_lock_irqsave(). |
| 93 | * And we need the kmap_atomic. |
| 94 | */ |
| 95 | struct drbd_bitmap { |
| 96 | struct page **bm_pages; |
| 97 | spinlock_t bm_lock; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 98 | |
| 99 | /* see LIMITATIONS: above */ |
| 100 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 101 | unsigned long bm_set; /* nr of set bits; THINK maybe atomic_t? */ |
| 102 | unsigned long bm_bits; |
| 103 | size_t bm_words; |
| 104 | size_t bm_number_of_pages; |
| 105 | sector_t bm_dev_capacity; |
Thomas Gleixner | 8a03ae2 | 2010-01-29 20:39:07 +0000 | [diff] [blame] | 106 | struct mutex bm_change; /* serializes resize operations */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 107 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 108 | wait_queue_head_t bm_io_wait; /* used to serialize IO of single pages */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 109 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 110 | enum bm_flag bm_flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 111 | |
| 112 | /* debugging aid, in case we are still racy somewhere */ |
| 113 | char *bm_why; |
| 114 | struct task_struct *bm_task; |
| 115 | }; |
| 116 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 117 | #define bm_print_lock_info(m) __bm_print_lock_info(m, __func__) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 118 | static void __bm_print_lock_info(struct drbd_device *device, const char *func) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 119 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 120 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 121 | if (!__ratelimit(&drbd_ratelimit_state)) |
| 122 | return; |
Andreas Gruenbacher | c60b025 | 2011-08-10 15:05:02 +0200 | [diff] [blame] | 123 | drbd_err(device, "FIXME %s[%d] in %s, bitmap locked for '%s' by %s[%d]\n", |
| 124 | current->comm, task_pid_nr(current), |
| 125 | func, b->bm_why ?: "?", |
| 126 | b->bm_task->comm, task_pid_nr(b->bm_task)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 127 | } |
| 128 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 129 | void drbd_bm_lock(struct drbd_device *device, char *why, enum bm_flag flags) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 130 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 131 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 132 | int trylock_failed; |
| 133 | |
| 134 | if (!b) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 135 | drbd_err(device, "FIXME no bitmap in drbd_bm_lock!?\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 136 | return; |
| 137 | } |
| 138 | |
Thomas Gleixner | 8a03ae2 | 2010-01-29 20:39:07 +0000 | [diff] [blame] | 139 | trylock_failed = !mutex_trylock(&b->bm_change); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 140 | |
| 141 | if (trylock_failed) { |
Andreas Gruenbacher | c60b025 | 2011-08-10 15:05:02 +0200 | [diff] [blame] | 142 | drbd_warn(device, "%s[%d] going to '%s' but bitmap already locked for '%s' by %s[%d]\n", |
| 143 | current->comm, task_pid_nr(current), |
| 144 | why, b->bm_why ?: "?", |
| 145 | b->bm_task->comm, task_pid_nr(b->bm_task)); |
Thomas Gleixner | 8a03ae2 | 2010-01-29 20:39:07 +0000 | [diff] [blame] | 146 | mutex_lock(&b->bm_change); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 147 | } |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 148 | if (BM_LOCKED_MASK & b->bm_flags) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 149 | drbd_err(device, "FIXME bitmap already locked in bm_lock\n"); |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 150 | b->bm_flags |= flags & BM_LOCKED_MASK; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 151 | |
| 152 | b->bm_why = why; |
| 153 | b->bm_task = current; |
| 154 | } |
| 155 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 156 | void drbd_bm_unlock(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 157 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 158 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 159 | if (!b) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 160 | drbd_err(device, "FIXME no bitmap in drbd_bm_unlock!?\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 161 | return; |
| 162 | } |
| 163 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 164 | if (!(BM_LOCKED_MASK & device->bitmap->bm_flags)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 165 | drbd_err(device, "FIXME bitmap not locked in bm_unlock\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 166 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 167 | b->bm_flags &= ~BM_LOCKED_MASK; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 168 | b->bm_why = NULL; |
| 169 | b->bm_task = NULL; |
Thomas Gleixner | 8a03ae2 | 2010-01-29 20:39:07 +0000 | [diff] [blame] | 170 | mutex_unlock(&b->bm_change); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 171 | } |
| 172 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 173 | /* we store some "meta" info about our pages in page->private */ |
| 174 | /* at a granularity of 4k storage per bitmap bit: |
| 175 | * one peta byte storage: 1<<50 byte, 1<<38 * 4k storage blocks |
| 176 | * 1<<38 bits, |
| 177 | * 1<<23 4k bitmap pages. |
| 178 | * Use 24 bits as page index, covers 2 peta byte storage |
| 179 | * at a granularity of 4k per bit. |
| 180 | * Used to report the failed page idx on io error from the endio handlers. |
| 181 | */ |
| 182 | #define BM_PAGE_IDX_MASK ((1UL<<24)-1) |
| 183 | /* this page is currently read in, or written back */ |
| 184 | #define BM_PAGE_IO_LOCK 31 |
| 185 | /* if there has been an IO error for this page */ |
| 186 | #define BM_PAGE_IO_ERROR 30 |
| 187 | /* this is to be able to intelligently skip disk IO, |
| 188 | * set if bits have been set since last IO. */ |
| 189 | #define BM_PAGE_NEED_WRITEOUT 29 |
| 190 | /* to mark for lazy writeout once syncer cleared all clearable bits, |
| 191 | * we if bits have been cleared since last IO. */ |
| 192 | #define BM_PAGE_LAZY_WRITEOUT 28 |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 193 | /* pages marked with this "HINT" will be considered for writeout |
| 194 | * on activity log transactions */ |
| 195 | #define BM_PAGE_HINT_WRITEOUT 27 |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 196 | |
Bart Van Assche | 24c4830 | 2011-05-21 18:32:29 +0200 | [diff] [blame] | 197 | /* store_page_idx uses non-atomic assignment. It is only used directly after |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 198 | * allocating the page. All other bm_set_page_* and bm_clear_page_* need to |
| 199 | * use atomic bit manipulation, as set_out_of_sync (and therefore bitmap |
| 200 | * changes) may happen from various contexts, and wait_on_bit/wake_up_bit |
| 201 | * requires it all to be atomic as well. */ |
| 202 | static void bm_store_page_idx(struct page *page, unsigned long idx) |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 203 | { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 204 | BUG_ON(0 != (idx & ~BM_PAGE_IDX_MASK)); |
Arne Redlich | 0c7db27 | 2012-03-16 08:19:33 +0100 | [diff] [blame] | 205 | set_page_private(page, idx); |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 206 | } |
| 207 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 208 | static unsigned long bm_page_to_idx(struct page *page) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 209 | { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 210 | return page_private(page) & BM_PAGE_IDX_MASK; |
| 211 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 212 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 213 | /* As is very unlikely that the same page is under IO from more than one |
| 214 | * context, we can get away with a bit per page and one wait queue per bitmap. |
| 215 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 216 | static void bm_page_lock_io(struct drbd_device *device, int page_nr) |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 217 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 218 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 219 | void *addr = &page_private(b->bm_pages[page_nr]); |
| 220 | wait_event(b->bm_io_wait, !test_and_set_bit(BM_PAGE_IO_LOCK, addr)); |
| 221 | } |
| 222 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 223 | static void bm_page_unlock_io(struct drbd_device *device, int page_nr) |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 224 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 225 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 226 | void *addr = &page_private(b->bm_pages[page_nr]); |
Lars Ellenberg | 4738fa1 | 2011-02-21 13:20:55 +0100 | [diff] [blame] | 227 | clear_bit_unlock(BM_PAGE_IO_LOCK, addr); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 228 | wake_up(&device->bitmap->bm_io_wait); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | /* set _before_ submit_io, so it may be reset due to being changed |
| 232 | * while this page is in flight... will get submitted later again */ |
| 233 | static void bm_set_page_unchanged(struct page *page) |
| 234 | { |
| 235 | /* use cmpxchg? */ |
| 236 | clear_bit(BM_PAGE_NEED_WRITEOUT, &page_private(page)); |
| 237 | clear_bit(BM_PAGE_LAZY_WRITEOUT, &page_private(page)); |
| 238 | } |
| 239 | |
| 240 | static void bm_set_page_need_writeout(struct page *page) |
| 241 | { |
| 242 | set_bit(BM_PAGE_NEED_WRITEOUT, &page_private(page)); |
| 243 | } |
| 244 | |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 245 | /** |
| 246 | * drbd_bm_mark_for_writeout() - mark a page with a "hint" to be considered for writeout |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 247 | * @device: DRBD device. |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 248 | * @page_nr: the bitmap page to mark with the "hint" flag |
| 249 | * |
| 250 | * From within an activity log transaction, we mark a few pages with these |
| 251 | * hints, then call drbd_bm_write_hinted(), which will only write out changed |
| 252 | * pages which are flagged with this mark. |
| 253 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 254 | void drbd_bm_mark_for_writeout(struct drbd_device *device, int page_nr) |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 255 | { |
| 256 | struct page *page; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 257 | if (page_nr >= device->bitmap->bm_number_of_pages) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 258 | drbd_warn(device, "BAD: page_nr: %u, number_of_pages: %u\n", |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 259 | page_nr, (int)device->bitmap->bm_number_of_pages); |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 260 | return; |
| 261 | } |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 262 | page = device->bitmap->bm_pages[page_nr]; |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 263 | set_bit(BM_PAGE_HINT_WRITEOUT, &page_private(page)); |
| 264 | } |
| 265 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 266 | static int bm_test_page_unchanged(struct page *page) |
| 267 | { |
| 268 | volatile const unsigned long *addr = &page_private(page); |
| 269 | return (*addr & ((1UL<<BM_PAGE_NEED_WRITEOUT)|(1UL<<BM_PAGE_LAZY_WRITEOUT))) == 0; |
| 270 | } |
| 271 | |
| 272 | static void bm_set_page_io_err(struct page *page) |
| 273 | { |
| 274 | set_bit(BM_PAGE_IO_ERROR, &page_private(page)); |
| 275 | } |
| 276 | |
| 277 | static void bm_clear_page_io_err(struct page *page) |
| 278 | { |
| 279 | clear_bit(BM_PAGE_IO_ERROR, &page_private(page)); |
| 280 | } |
| 281 | |
| 282 | static void bm_set_page_lazy_writeout(struct page *page) |
| 283 | { |
| 284 | set_bit(BM_PAGE_LAZY_WRITEOUT, &page_private(page)); |
| 285 | } |
| 286 | |
| 287 | static int bm_test_page_lazy_writeout(struct page *page) |
| 288 | { |
| 289 | return test_bit(BM_PAGE_LAZY_WRITEOUT, &page_private(page)); |
| 290 | } |
| 291 | |
| 292 | /* on a 32bit box, this would allow for exactly (2<<38) bits. */ |
| 293 | static unsigned int bm_word_to_page_idx(struct drbd_bitmap *b, unsigned long long_nr) |
| 294 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 295 | /* page_nr = (word*sizeof(long)) >> PAGE_SHIFT; */ |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 296 | unsigned int page_nr = long_nr >> (PAGE_SHIFT - LN2_BPL + 3); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 297 | BUG_ON(page_nr >= b->bm_number_of_pages); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 298 | return page_nr; |
| 299 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 300 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 301 | static unsigned int bm_bit_to_page_idx(struct drbd_bitmap *b, u64 bitnr) |
| 302 | { |
| 303 | /* page_nr = (bitnr/8) >> PAGE_SHIFT; */ |
| 304 | unsigned int page_nr = bitnr >> (PAGE_SHIFT + 3); |
| 305 | BUG_ON(page_nr >= b->bm_number_of_pages); |
| 306 | return page_nr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 307 | } |
| 308 | |
Cong Wang | 589973a | 2011-11-25 23:51:58 +0800 | [diff] [blame] | 309 | static unsigned long *__bm_map_pidx(struct drbd_bitmap *b, unsigned int idx) |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 310 | { |
| 311 | struct page *page = b->bm_pages[idx]; |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 312 | return (unsigned long *) kmap_atomic(page); |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | static unsigned long *bm_map_pidx(struct drbd_bitmap *b, unsigned int idx) |
| 316 | { |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 317 | return __bm_map_pidx(b, idx); |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 318 | } |
| 319 | |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 320 | static void __bm_unmap(unsigned long *p_addr) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 321 | { |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 322 | kunmap_atomic(p_addr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 323 | }; |
| 324 | |
| 325 | static void bm_unmap(unsigned long *p_addr) |
| 326 | { |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 327 | return __bm_unmap(p_addr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | /* long word offset of _bitmap_ sector */ |
| 331 | #define S2W(s) ((s)<<(BM_EXT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL)) |
| 332 | /* word offset from start of bitmap to word number _in_page_ |
| 333 | * modulo longs per page |
| 334 | #define MLPP(X) ((X) % (PAGE_SIZE/sizeof(long)) |
Bart Van Assche | 24c4830 | 2011-05-21 18:32:29 +0200 | [diff] [blame] | 335 | hm, well, Philipp thinks gcc might not optimize the % into & (... - 1) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 336 | so do it explicitly: |
| 337 | */ |
| 338 | #define MLPP(X) ((X) & ((PAGE_SIZE/sizeof(long))-1)) |
| 339 | |
| 340 | /* Long words per page */ |
| 341 | #define LWPP (PAGE_SIZE/sizeof(long)) |
| 342 | |
| 343 | /* |
| 344 | * actually most functions herein should take a struct drbd_bitmap*, not a |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 345 | * struct drbd_device*, but for the debug macros I like to have the device around |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 346 | * to be able to report device specific. |
| 347 | */ |
| 348 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 349 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 350 | static void bm_free_pages(struct page **pages, unsigned long number) |
| 351 | { |
| 352 | unsigned long i; |
| 353 | if (!pages) |
| 354 | return; |
| 355 | |
| 356 | for (i = 0; i < number; i++) { |
| 357 | if (!pages[i]) { |
Lars Ellenberg | f88c5d9 | 2014-03-27 14:10:55 +0100 | [diff] [blame] | 358 | pr_alert("bm_free_pages tried to free a NULL pointer; i=%lu n=%lu\n", |
| 359 | i, number); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 360 | continue; |
| 361 | } |
| 362 | __free_page(pages[i]); |
| 363 | pages[i] = NULL; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | static void bm_vk_free(void *ptr, int v) |
| 368 | { |
| 369 | if (v) |
| 370 | vfree(ptr); |
| 371 | else |
| 372 | kfree(ptr); |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * "have" and "want" are NUMBER OF PAGES. |
| 377 | */ |
| 378 | static struct page **bm_realloc_pages(struct drbd_bitmap *b, unsigned long want) |
| 379 | { |
| 380 | struct page **old_pages = b->bm_pages; |
| 381 | struct page **new_pages, *page; |
| 382 | unsigned int i, bytes, vmalloced = 0; |
| 383 | unsigned long have = b->bm_number_of_pages; |
| 384 | |
| 385 | BUG_ON(have == 0 && old_pages != NULL); |
| 386 | BUG_ON(have != 0 && old_pages == NULL); |
| 387 | |
| 388 | if (have == want) |
| 389 | return old_pages; |
| 390 | |
| 391 | /* Trying kmalloc first, falling back to vmalloc. |
Lars Ellenberg | 0b143d4 | 2012-09-20 14:05:39 +0200 | [diff] [blame] | 392 | * GFP_NOIO, as this is called while drbd IO is "suspended", |
| 393 | * and during resize or attach on diskless Primary, |
| 394 | * we must not block on IO to ourselves. |
Lars Ellenberg | bc891c9 | 2012-09-26 14:18:51 +0200 | [diff] [blame] | 395 | * Context is receiver thread or dmsetup. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 396 | bytes = sizeof(struct page *)*want; |
Joe Perches | 8be04b9 | 2013-06-19 12:15:53 -0700 | [diff] [blame] | 397 | new_pages = kzalloc(bytes, GFP_NOIO | __GFP_NOWARN); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 398 | if (!new_pages) { |
Lars Ellenberg | 0b143d4 | 2012-09-20 14:05:39 +0200 | [diff] [blame] | 399 | new_pages = __vmalloc(bytes, |
| 400 | GFP_NOIO | __GFP_HIGHMEM | __GFP_ZERO, |
| 401 | PAGE_KERNEL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 402 | if (!new_pages) |
| 403 | return NULL; |
| 404 | vmalloced = 1; |
| 405 | } |
| 406 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 407 | if (want >= have) { |
| 408 | for (i = 0; i < have; i++) |
| 409 | new_pages[i] = old_pages[i]; |
| 410 | for (; i < want; i++) { |
Lars Ellenberg | 0b143d4 | 2012-09-20 14:05:39 +0200 | [diff] [blame] | 411 | page = alloc_page(GFP_NOIO | __GFP_HIGHMEM); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 412 | if (!page) { |
| 413 | bm_free_pages(new_pages + have, i - have); |
| 414 | bm_vk_free(new_pages, vmalloced); |
| 415 | return NULL; |
| 416 | } |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 417 | /* we want to know which page it is |
| 418 | * from the endio handlers */ |
| 419 | bm_store_page_idx(page, i); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 420 | new_pages[i] = page; |
| 421 | } |
| 422 | } else { |
| 423 | for (i = 0; i < want; i++) |
| 424 | new_pages[i] = old_pages[i]; |
| 425 | /* NOT HERE, we are outside the spinlock! |
| 426 | bm_free_pages(old_pages + want, have - want); |
| 427 | */ |
| 428 | } |
| 429 | |
| 430 | if (vmalloced) |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 431 | b->bm_flags |= BM_P_VMALLOCED; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 432 | else |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 433 | b->bm_flags &= ~BM_P_VMALLOCED; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 434 | |
| 435 | return new_pages; |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * called on driver init only. TODO call when a device is created. |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 440 | * allocates the drbd_bitmap, and stores it in device->bitmap. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 441 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 442 | int drbd_bm_init(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 443 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 444 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 445 | WARN_ON(b != NULL); |
| 446 | b = kzalloc(sizeof(struct drbd_bitmap), GFP_KERNEL); |
| 447 | if (!b) |
| 448 | return -ENOMEM; |
| 449 | spin_lock_init(&b->bm_lock); |
Thomas Gleixner | 8a03ae2 | 2010-01-29 20:39:07 +0000 | [diff] [blame] | 450 | mutex_init(&b->bm_change); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 451 | init_waitqueue_head(&b->bm_io_wait); |
| 452 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 453 | device->bitmap = b; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 454 | |
| 455 | return 0; |
| 456 | } |
| 457 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 458 | sector_t drbd_bm_capacity(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 459 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 460 | if (!expect(device->bitmap)) |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 461 | return 0; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 462 | return device->bitmap->bm_dev_capacity; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* called on driver unload. TODO: call when a device is destroyed. |
| 466 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 467 | void drbd_bm_cleanup(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 468 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 469 | if (!expect(device->bitmap)) |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 470 | return; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 471 | bm_free_pages(device->bitmap->bm_pages, device->bitmap->bm_number_of_pages); |
| 472 | bm_vk_free(device->bitmap->bm_pages, (BM_P_VMALLOCED & device->bitmap->bm_flags)); |
| 473 | kfree(device->bitmap); |
| 474 | device->bitmap = NULL; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | /* |
| 478 | * since (b->bm_bits % BITS_PER_LONG) != 0, |
| 479 | * this masks out the remaining bits. |
| 480 | * Returns the number of bits cleared. |
| 481 | */ |
Lars Ellenberg | 2630628 | 2015-03-20 15:47:22 +0100 | [diff] [blame] | 482 | #ifndef BITS_PER_PAGE |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 483 | #define BITS_PER_PAGE (1UL << (PAGE_SHIFT + 3)) |
| 484 | #define BITS_PER_PAGE_MASK (BITS_PER_PAGE - 1) |
Lars Ellenberg | 2630628 | 2015-03-20 15:47:22 +0100 | [diff] [blame] | 485 | #else |
| 486 | # if BITS_PER_PAGE != (1UL << (PAGE_SHIFT + 3)) |
| 487 | # error "ambiguous BITS_PER_PAGE" |
| 488 | # endif |
| 489 | #endif |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 490 | #define BITS_PER_LONG_MASK (BITS_PER_LONG - 1) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 491 | static int bm_clear_surplus(struct drbd_bitmap *b) |
| 492 | { |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 493 | unsigned long mask; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 494 | unsigned long *p_addr, *bm; |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 495 | int tmp; |
| 496 | int cleared = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 497 | |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 498 | /* number of bits modulo bits per page */ |
| 499 | tmp = (b->bm_bits & BITS_PER_PAGE_MASK); |
| 500 | /* mask the used bits of the word containing the last bit */ |
| 501 | mask = (1UL << (tmp & BITS_PER_LONG_MASK)) -1; |
| 502 | /* bitmap is always stored little endian, |
| 503 | * on disk and in core memory alike */ |
| 504 | mask = cpu_to_lel(mask); |
| 505 | |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 506 | p_addr = bm_map_pidx(b, b->bm_number_of_pages - 1); |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 507 | bm = p_addr + (tmp/BITS_PER_LONG); |
| 508 | if (mask) { |
| 509 | /* If mask != 0, we are not exactly aligned, so bm now points |
| 510 | * to the long containing the last bit. |
| 511 | * If mask == 0, bm already points to the word immediately |
| 512 | * after the last (long word aligned) bit. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 513 | cleared = hweight_long(*bm & ~mask); |
| 514 | *bm &= mask; |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 515 | bm++; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 516 | } |
| 517 | |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 518 | if (BITS_PER_LONG == 32 && ((bm - p_addr) & 1) == 1) { |
| 519 | /* on a 32bit arch, we may need to zero out |
| 520 | * a padding long to align with a 64bit remote */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 521 | cleared += hweight_long(*bm); |
| 522 | *bm = 0; |
| 523 | } |
| 524 | bm_unmap(p_addr); |
| 525 | return cleared; |
| 526 | } |
| 527 | |
| 528 | static void bm_set_surplus(struct drbd_bitmap *b) |
| 529 | { |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 530 | unsigned long mask; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 531 | unsigned long *p_addr, *bm; |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 532 | int tmp; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 533 | |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 534 | /* number of bits modulo bits per page */ |
| 535 | tmp = (b->bm_bits & BITS_PER_PAGE_MASK); |
| 536 | /* mask the used bits of the word containing the last bit */ |
| 537 | mask = (1UL << (tmp & BITS_PER_LONG_MASK)) -1; |
| 538 | /* bitmap is always stored little endian, |
| 539 | * on disk and in core memory alike */ |
| 540 | mask = cpu_to_lel(mask); |
| 541 | |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 542 | p_addr = bm_map_pidx(b, b->bm_number_of_pages - 1); |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 543 | bm = p_addr + (tmp/BITS_PER_LONG); |
| 544 | if (mask) { |
| 545 | /* If mask != 0, we are not exactly aligned, so bm now points |
| 546 | * to the long containing the last bit. |
| 547 | * If mask == 0, bm already points to the word immediately |
| 548 | * after the last (long word aligned) bit. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 549 | *bm |= ~mask; |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 550 | bm++; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 551 | } |
| 552 | |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 553 | if (BITS_PER_LONG == 32 && ((bm - p_addr) & 1) == 1) { |
| 554 | /* on a 32bit arch, we may need to zero out |
| 555 | * a padding long to align with a 64bit remote */ |
| 556 | *bm = ~0UL; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 557 | } |
| 558 | bm_unmap(p_addr); |
| 559 | } |
| 560 | |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 561 | /* you better not modify the bitmap while this is running, |
| 562 | * or its results will be stale */ |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 563 | static unsigned long bm_count_bits(struct drbd_bitmap *b) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 564 | { |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 565 | unsigned long *p_addr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 566 | unsigned long bits = 0; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 567 | unsigned long mask = (1UL << (b->bm_bits & BITS_PER_LONG_MASK)) -1; |
Lars Ellenberg | 5fb3bc4 | 2015-03-20 16:15:24 +0100 | [diff] [blame^] | 568 | int idx, last_word; |
Lars Ellenberg | 7777a8b | 2010-12-15 23:21:39 +0100 | [diff] [blame] | 569 | |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 570 | /* all but last page */ |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 571 | for (idx = 0; idx < b->bm_number_of_pages - 1; idx++) { |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 572 | p_addr = __bm_map_pidx(b, idx); |
Lars Ellenberg | 5fb3bc4 | 2015-03-20 16:15:24 +0100 | [diff] [blame^] | 573 | bits += bitmap_weight(p_addr, BITS_PER_PAGE); |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 574 | __bm_unmap(p_addr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 575 | cond_resched(); |
| 576 | } |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 577 | /* last (or only) page */ |
| 578 | last_word = ((b->bm_bits - 1) & BITS_PER_PAGE_MASK) >> LN2_BPL; |
Cong Wang | 589973a | 2011-11-25 23:51:58 +0800 | [diff] [blame] | 579 | p_addr = __bm_map_pidx(b, idx); |
Lars Ellenberg | 5fb3bc4 | 2015-03-20 16:15:24 +0100 | [diff] [blame^] | 580 | bits += bitmap_weight(p_addr, last_word * BITS_PER_LONG); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 581 | p_addr[last_word] &= cpu_to_lel(mask); |
| 582 | bits += hweight_long(p_addr[last_word]); |
| 583 | /* 32bit arch, may have an unused padding long */ |
| 584 | if (BITS_PER_LONG == 32 && (last_word & 1) == 0) |
| 585 | p_addr[last_word+1] = 0; |
Cong Wang | 589973a | 2011-11-25 23:51:58 +0800 | [diff] [blame] | 586 | __bm_unmap(p_addr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 587 | return bits; |
| 588 | } |
| 589 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 590 | /* offset and len in long words.*/ |
| 591 | static void bm_memset(struct drbd_bitmap *b, size_t offset, int c, size_t len) |
| 592 | { |
| 593 | unsigned long *p_addr, *bm; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 594 | unsigned int idx; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 595 | size_t do_now, end; |
| 596 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 597 | end = offset + len; |
| 598 | |
| 599 | if (end > b->bm_words) { |
Lars Ellenberg | f88c5d9 | 2014-03-27 14:10:55 +0100 | [diff] [blame] | 600 | pr_alert("bm_memset end > bm_words\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 601 | return; |
| 602 | } |
| 603 | |
| 604 | while (offset < end) { |
| 605 | do_now = min_t(size_t, ALIGN(offset + 1, LWPP), end) - offset; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 606 | idx = bm_word_to_page_idx(b, offset); |
| 607 | p_addr = bm_map_pidx(b, idx); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 608 | bm = p_addr + MLPP(offset); |
| 609 | if (bm+do_now > p_addr + LWPP) { |
Lars Ellenberg | f88c5d9 | 2014-03-27 14:10:55 +0100 | [diff] [blame] | 610 | pr_alert("BUG BUG BUG! p_addr:%p bm:%p do_now:%d\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 611 | p_addr, bm, (int)do_now); |
Lars Ellenberg | 84e7c0f | 2010-12-16 00:37:57 +0100 | [diff] [blame] | 612 | } else |
| 613 | memset(bm, c, do_now * sizeof(long)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 614 | bm_unmap(p_addr); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 615 | bm_set_page_need_writeout(b->bm_pages[idx]); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 616 | offset += do_now; |
| 617 | } |
| 618 | } |
| 619 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame] | 620 | /* For the layout, see comment above drbd_md_set_sector_offsets(). */ |
| 621 | static u64 drbd_md_on_disk_bits(struct drbd_backing_dev *ldev) |
| 622 | { |
| 623 | u64 bitmap_sectors; |
| 624 | if (ldev->md.al_offset == 8) |
| 625 | bitmap_sectors = ldev->md.md_size_sect - ldev->md.bm_offset; |
| 626 | else |
| 627 | bitmap_sectors = ldev->md.al_offset - ldev->md.bm_offset; |
| 628 | return bitmap_sectors << (9 + 3); |
| 629 | } |
| 630 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 631 | /* |
| 632 | * make sure the bitmap has enough room for the attached storage, |
| 633 | * if necessary, resize. |
| 634 | * called whenever we may have changed the device size. |
| 635 | * returns -ENOMEM if we could not allocate enough memory, 0 on success. |
| 636 | * In case this is actually a resize, we copy the old bitmap into the new one. |
| 637 | * Otherwise, the bitmap is initialized to all bits set. |
| 638 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 639 | int drbd_bm_resize(struct drbd_device *device, sector_t capacity, int set_new_bits) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 640 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 641 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 642 | unsigned long bits, words, owords, obits; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 643 | unsigned long want, have, onpages; /* number of pages */ |
| 644 | struct page **npages, **opages = NULL; |
| 645 | int err = 0, growing; |
| 646 | int opages_vmalloced; |
| 647 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 648 | if (!expect(b)) |
| 649 | return -ENOMEM; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 650 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 651 | drbd_bm_lock(device, "resize", BM_LOCKED_MASK); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 652 | |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 653 | drbd_info(device, "drbd_bm_resize called with capacity == %llu\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 654 | (unsigned long long)capacity); |
| 655 | |
| 656 | if (capacity == b->bm_dev_capacity) |
| 657 | goto out; |
| 658 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 659 | opages_vmalloced = (BM_P_VMALLOCED & b->bm_flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 660 | |
| 661 | if (capacity == 0) { |
| 662 | spin_lock_irq(&b->bm_lock); |
| 663 | opages = b->bm_pages; |
| 664 | onpages = b->bm_number_of_pages; |
| 665 | owords = b->bm_words; |
| 666 | b->bm_pages = NULL; |
| 667 | b->bm_number_of_pages = |
| 668 | b->bm_set = |
| 669 | b->bm_bits = |
| 670 | b->bm_words = |
| 671 | b->bm_dev_capacity = 0; |
| 672 | spin_unlock_irq(&b->bm_lock); |
| 673 | bm_free_pages(opages, onpages); |
| 674 | bm_vk_free(opages, opages_vmalloced); |
| 675 | goto out; |
| 676 | } |
| 677 | bits = BM_SECT_TO_BIT(ALIGN(capacity, BM_SECT_PER_BIT)); |
| 678 | |
| 679 | /* if we would use |
| 680 | words = ALIGN(bits,BITS_PER_LONG) >> LN2_BPL; |
| 681 | a 32bit host could present the wrong number of words |
| 682 | to a 64bit host. |
| 683 | */ |
| 684 | words = ALIGN(bits, 64) >> LN2_BPL; |
| 685 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 686 | if (get_ldev(device)) { |
| 687 | u64 bits_on_disk = drbd_md_on_disk_bits(device->ldev); |
| 688 | put_ldev(device); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 689 | if (bits > bits_on_disk) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 690 | drbd_info(device, "bits = %lu\n", bits); |
| 691 | drbd_info(device, "bits_on_disk = %llu\n", bits_on_disk); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 692 | err = -ENOSPC; |
| 693 | goto out; |
| 694 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 695 | } |
| 696 | |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 697 | want = ALIGN(words*sizeof(long), PAGE_SIZE) >> PAGE_SHIFT; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 698 | have = b->bm_number_of_pages; |
| 699 | if (want == have) { |
Andreas Gruenbacher | 0b0ba1e | 2011-06-27 16:23:33 +0200 | [diff] [blame] | 700 | D_ASSERT(device, b->bm_pages != NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 701 | npages = b->bm_pages; |
| 702 | } else { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 703 | if (drbd_insert_fault(device, DRBD_FAULT_BM_ALLOC)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 704 | npages = NULL; |
| 705 | else |
| 706 | npages = bm_realloc_pages(b, want); |
| 707 | } |
| 708 | |
| 709 | if (!npages) { |
| 710 | err = -ENOMEM; |
| 711 | goto out; |
| 712 | } |
| 713 | |
| 714 | spin_lock_irq(&b->bm_lock); |
| 715 | opages = b->bm_pages; |
| 716 | owords = b->bm_words; |
| 717 | obits = b->bm_bits; |
| 718 | |
| 719 | growing = bits > obits; |
Philipp Reisner | 5223671 | 2010-04-28 14:46:57 +0200 | [diff] [blame] | 720 | if (opages && growing && set_new_bits) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 721 | bm_set_surplus(b); |
| 722 | |
| 723 | b->bm_pages = npages; |
| 724 | b->bm_number_of_pages = want; |
| 725 | b->bm_bits = bits; |
| 726 | b->bm_words = words; |
| 727 | b->bm_dev_capacity = capacity; |
| 728 | |
| 729 | if (growing) { |
Philipp Reisner | 02d9a94 | 2010-03-24 16:23:03 +0100 | [diff] [blame] | 730 | if (set_new_bits) { |
| 731 | bm_memset(b, owords, 0xff, words-owords); |
| 732 | b->bm_set += bits - obits; |
| 733 | } else |
| 734 | bm_memset(b, owords, 0x00, words-owords); |
| 735 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | if (want < have) { |
| 739 | /* implicit: (opages != NULL) && (opages != npages) */ |
| 740 | bm_free_pages(opages + want, have - want); |
| 741 | } |
| 742 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 743 | (void)bm_clear_surplus(b); |
| 744 | |
| 745 | spin_unlock_irq(&b->bm_lock); |
| 746 | if (opages != npages) |
| 747 | bm_vk_free(opages, opages_vmalloced); |
| 748 | if (!growing) |
| 749 | b->bm_set = bm_count_bits(b); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 750 | drbd_info(device, "resync bitmap: bits=%lu words=%lu pages=%lu\n", bits, words, want); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 751 | |
| 752 | out: |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 753 | drbd_bm_unlock(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 754 | return err; |
| 755 | } |
| 756 | |
| 757 | /* inherently racy: |
| 758 | * if not protected by other means, return value may be out of date when |
| 759 | * leaving this function... |
| 760 | * we still need to lock it, since it is important that this returns |
| 761 | * bm_set == 0 precisely. |
| 762 | * |
| 763 | * maybe bm_set should be atomic_t ? |
| 764 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 765 | unsigned long _drbd_bm_total_weight(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 766 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 767 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 768 | unsigned long s; |
| 769 | unsigned long flags; |
| 770 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 771 | if (!expect(b)) |
| 772 | return 0; |
| 773 | if (!expect(b->bm_pages)) |
| 774 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 775 | |
| 776 | spin_lock_irqsave(&b->bm_lock, flags); |
| 777 | s = b->bm_set; |
| 778 | spin_unlock_irqrestore(&b->bm_lock, flags); |
| 779 | |
| 780 | return s; |
| 781 | } |
| 782 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 783 | unsigned long drbd_bm_total_weight(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 784 | { |
| 785 | unsigned long s; |
| 786 | /* if I don't have a disk, I don't know about out-of-sync status */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 787 | if (!get_ldev_if_state(device, D_NEGOTIATING)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 788 | return 0; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 789 | s = _drbd_bm_total_weight(device); |
| 790 | put_ldev(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 791 | return s; |
| 792 | } |
| 793 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 794 | size_t drbd_bm_words(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 795 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 796 | struct drbd_bitmap *b = device->bitmap; |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 797 | if (!expect(b)) |
| 798 | return 0; |
| 799 | if (!expect(b->bm_pages)) |
| 800 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 801 | |
| 802 | return b->bm_words; |
| 803 | } |
| 804 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 805 | unsigned long drbd_bm_bits(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 806 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 807 | struct drbd_bitmap *b = device->bitmap; |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 808 | if (!expect(b)) |
| 809 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 810 | |
| 811 | return b->bm_bits; |
| 812 | } |
| 813 | |
| 814 | /* merge number words from buffer into the bitmap starting at offset. |
| 815 | * buffer[i] is expected to be little endian unsigned long. |
| 816 | * bitmap must be locked by drbd_bm_lock. |
| 817 | * currently only used from receive_bitmap. |
| 818 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 819 | void drbd_bm_merge_lel(struct drbd_device *device, size_t offset, size_t number, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 820 | unsigned long *buffer) |
| 821 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 822 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 823 | unsigned long *p_addr, *bm; |
| 824 | unsigned long word, bits; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 825 | unsigned int idx; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 826 | size_t end, do_now; |
| 827 | |
| 828 | end = offset + number; |
| 829 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 830 | if (!expect(b)) |
| 831 | return; |
| 832 | if (!expect(b->bm_pages)) |
| 833 | return; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 834 | if (number == 0) |
| 835 | return; |
| 836 | WARN_ON(offset >= b->bm_words); |
| 837 | WARN_ON(end > b->bm_words); |
| 838 | |
| 839 | spin_lock_irq(&b->bm_lock); |
| 840 | while (offset < end) { |
| 841 | do_now = min_t(size_t, ALIGN(offset+1, LWPP), end) - offset; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 842 | idx = bm_word_to_page_idx(b, offset); |
| 843 | p_addr = bm_map_pidx(b, idx); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 844 | bm = p_addr + MLPP(offset); |
| 845 | offset += do_now; |
| 846 | while (do_now--) { |
| 847 | bits = hweight_long(*bm); |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 848 | word = *bm | *buffer++; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 849 | *bm++ = word; |
| 850 | b->bm_set += hweight_long(word) - bits; |
| 851 | } |
| 852 | bm_unmap(p_addr); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 853 | bm_set_page_need_writeout(b->bm_pages[idx]); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 854 | } |
| 855 | /* with 32bit <-> 64bit cross-platform connect |
| 856 | * this is only correct for current usage, |
| 857 | * where we _know_ that we are 64 bit aligned, |
| 858 | * and know that this function is used in this way, too... |
| 859 | */ |
| 860 | if (end == b->bm_words) |
| 861 | b->bm_set -= bm_clear_surplus(b); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 862 | spin_unlock_irq(&b->bm_lock); |
| 863 | } |
| 864 | |
| 865 | /* copy number words from the bitmap starting at offset into the buffer. |
| 866 | * buffer[i] will be little endian unsigned long. |
| 867 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 868 | void drbd_bm_get_lel(struct drbd_device *device, size_t offset, size_t number, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 869 | unsigned long *buffer) |
| 870 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 871 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 872 | unsigned long *p_addr, *bm; |
| 873 | size_t end, do_now; |
| 874 | |
| 875 | end = offset + number; |
| 876 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 877 | if (!expect(b)) |
| 878 | return; |
| 879 | if (!expect(b->bm_pages)) |
| 880 | return; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 881 | |
| 882 | spin_lock_irq(&b->bm_lock); |
| 883 | if ((offset >= b->bm_words) || |
| 884 | (end > b->bm_words) || |
| 885 | (number <= 0)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 886 | drbd_err(device, "offset=%lu number=%lu bm_words=%lu\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 887 | (unsigned long) offset, |
| 888 | (unsigned long) number, |
| 889 | (unsigned long) b->bm_words); |
| 890 | else { |
| 891 | while (offset < end) { |
| 892 | do_now = min_t(size_t, ALIGN(offset+1, LWPP), end) - offset; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 893 | p_addr = bm_map_pidx(b, bm_word_to_page_idx(b, offset)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 894 | bm = p_addr + MLPP(offset); |
| 895 | offset += do_now; |
| 896 | while (do_now--) |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 897 | *buffer++ = *bm++; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 898 | bm_unmap(p_addr); |
| 899 | } |
| 900 | } |
| 901 | spin_unlock_irq(&b->bm_lock); |
| 902 | } |
| 903 | |
| 904 | /* set all bits in the bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 905 | void drbd_bm_set_all(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 906 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 907 | struct drbd_bitmap *b = device->bitmap; |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 908 | if (!expect(b)) |
| 909 | return; |
| 910 | if (!expect(b->bm_pages)) |
| 911 | return; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 912 | |
| 913 | spin_lock_irq(&b->bm_lock); |
| 914 | bm_memset(b, 0, 0xff, b->bm_words); |
| 915 | (void)bm_clear_surplus(b); |
| 916 | b->bm_set = b->bm_bits; |
| 917 | spin_unlock_irq(&b->bm_lock); |
| 918 | } |
| 919 | |
| 920 | /* clear all bits in the bitmap */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 921 | void drbd_bm_clear_all(struct drbd_device *device) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 922 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 923 | struct drbd_bitmap *b = device->bitmap; |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 924 | if (!expect(b)) |
| 925 | return; |
| 926 | if (!expect(b->bm_pages)) |
| 927 | return; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 928 | |
| 929 | spin_lock_irq(&b->bm_lock); |
| 930 | bm_memset(b, 0, 0, b->bm_words); |
| 931 | b->bm_set = 0; |
| 932 | spin_unlock_irq(&b->bm_lock); |
| 933 | } |
| 934 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 935 | static void drbd_bm_aio_ctx_destroy(struct kref *kref) |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 936 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 937 | struct drbd_bm_aio_ctx *ctx = container_of(kref, struct drbd_bm_aio_ctx, kref); |
| 938 | unsigned long flags; |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 939 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 940 | spin_lock_irqsave(&ctx->device->resource->req_lock, flags); |
| 941 | list_del(&ctx->list); |
| 942 | spin_unlock_irqrestore(&ctx->device->resource->req_lock, flags); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 943 | put_ldev(ctx->device); |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 944 | kfree(ctx); |
| 945 | } |
| 946 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 947 | /* bv_page may be a copy, or may be the original */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 948 | static void drbd_bm_endio(struct bio *bio) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 949 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 950 | struct drbd_bm_aio_ctx *ctx = bio->bi_private; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 951 | struct drbd_device *device = ctx->device; |
| 952 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 953 | unsigned int idx = bm_page_to_idx(bio->bi_io_vec[0].bv_page); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 954 | |
Lars Ellenberg | 7648cdf | 2010-12-17 23:58:41 +0100 | [diff] [blame] | 955 | if ((ctx->flags & BM_AIO_COPY_PAGES) == 0 && |
| 956 | !bm_test_page_unchanged(b->bm_pages[idx])) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 957 | drbd_warn(device, "bitmap page idx %u changed during IO!\n", idx); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 958 | |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 959 | if (bio->bi_error) { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 960 | /* ctx error will hold the completed-last non-zero error code, |
| 961 | * in case error codes differ. */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 962 | ctx->error = bio->bi_error; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 963 | bm_set_page_io_err(b->bm_pages[idx]); |
| 964 | /* Not identical to on disk version of it. |
| 965 | * Is BM_PAGE_IO_ERROR enough? */ |
| 966 | if (__ratelimit(&drbd_ratelimit_state)) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 967 | drbd_err(device, "IO ERROR %d on bitmap page idx %u\n", |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 968 | bio->bi_error, idx); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 969 | } else { |
| 970 | bm_clear_page_io_err(b->bm_pages[idx]); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 971 | dynamic_drbd_dbg(device, "bitmap page idx %u completed\n", idx); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 972 | } |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 973 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 974 | bm_page_unlock_io(device, idx); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 975 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 976 | if (ctx->flags & BM_AIO_COPY_PAGES) |
Lars Ellenberg | 4d95a10 | 2011-02-23 15:38:47 +0100 | [diff] [blame] | 977 | mempool_free(bio->bi_io_vec[0].bv_page, drbd_md_io_page_pool); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 978 | |
| 979 | bio_put(bio); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 980 | |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 981 | if (atomic_dec_and_test(&ctx->in_flight)) { |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 982 | ctx->done = 1; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 983 | wake_up(&device->misc_wait); |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 984 | kref_put(&ctx->kref, &drbd_bm_aio_ctx_destroy); |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 985 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 986 | } |
| 987 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 988 | static void bm_page_io_async(struct drbd_bm_aio_ctx *ctx, int page_nr) __must_hold(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 989 | { |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 990 | struct bio *bio = bio_alloc_drbd(GFP_NOIO); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 991 | struct drbd_device *device = ctx->device; |
| 992 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 993 | struct page *page; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 994 | unsigned int len; |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 995 | unsigned int rw = (ctx->flags & BM_AIO_READ) ? READ : WRITE; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 996 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 997 | sector_t on_disk_sector = |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 998 | device->ldev->md.md_offset + device->ldev->md.bm_offset; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 999 | on_disk_sector += ((sector_t)page_nr) << (PAGE_SHIFT-9); |
| 1000 | |
| 1001 | /* this might happen with very small |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1002 | * flexible external meta data device, |
| 1003 | * or with PAGE_SIZE > 4k */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1004 | len = min_t(unsigned int, PAGE_SIZE, |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1005 | (drbd_md_last_sector(device->ldev) - on_disk_sector + 1)<<9); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1006 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1007 | /* serialize IO on this page */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1008 | bm_page_lock_io(device, page_nr); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1009 | /* before memcpy and submit, |
| 1010 | * so it can be redirtied any time */ |
| 1011 | bm_set_page_unchanged(b->bm_pages[page_nr]); |
| 1012 | |
| 1013 | if (ctx->flags & BM_AIO_COPY_PAGES) { |
Mel Gorman | 71baba4 | 2015-11-06 16:28:28 -0800 | [diff] [blame] | 1014 | page = mempool_alloc(drbd_md_io_page_pool, __GFP_HIGHMEM|__GFP_RECLAIM); |
Akinobu Mita | f1d6a32 | 2012-11-08 16:12:31 -0800 | [diff] [blame] | 1015 | copy_highpage(page, b->bm_pages[page_nr]); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1016 | bm_store_page_idx(page, page_nr); |
| 1017 | } else |
| 1018 | page = b->bm_pages[page_nr]; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1019 | bio->bi_bdev = device->ldev->md_bdev; |
Kent Overstreet | 4f024f3 | 2013-10-11 15:44:27 -0700 | [diff] [blame] | 1020 | bio->bi_iter.bi_sector = on_disk_sector; |
Lars Ellenberg | 4d95a10 | 2011-02-23 15:38:47 +0100 | [diff] [blame] | 1021 | /* bio_add_page of a single page to an empty bio will always succeed, |
| 1022 | * according to api. Do we want to assert that? */ |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1023 | bio_add_page(bio, page, len, 0); |
| 1024 | bio->bi_private = ctx; |
Andreas Gruenbacher | ed15b79 | 2014-09-11 14:29:06 +0200 | [diff] [blame] | 1025 | bio->bi_end_io = drbd_bm_endio; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1026 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1027 | 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] | 1028 | bio->bi_rw |= rw; |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1029 | bio_io_error(bio); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1030 | } else { |
| 1031 | submit_bio(rw, bio); |
Lars Ellenberg | 5a8b424 | 2011-06-14 14:18:23 +0200 | [diff] [blame] | 1032 | /* this should not count as user activity and cause the |
| 1033 | * resync to throttle -- see drbd_rs_should_slow_down(). */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1034 | atomic_add(len >> 9, &device->rs_sect_ev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1035 | } |
| 1036 | } |
| 1037 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1038 | /* |
| 1039 | * bm_rw: read/write the whole bitmap from/to its on disk location. |
| 1040 | */ |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1041 | static int bm_rw(struct drbd_device *device, const unsigned int flags, unsigned lazy_writeout_upper_idx) __must_hold(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1042 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1043 | struct drbd_bm_aio_ctx *ctx; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1044 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 1045 | int num_pages, i, count = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1046 | unsigned long now; |
| 1047 | char ppb[10]; |
| 1048 | int err = 0; |
| 1049 | |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1050 | /* |
| 1051 | * We are protected against bitmap disappearing/resizing by holding an |
| 1052 | * ldev reference (caller must have called get_ldev()). |
| 1053 | * For read/write, we are protected against changes to the bitmap by |
| 1054 | * the bitmap lock (see drbd_bitmap_io). |
| 1055 | * For lazy writeout, we don't care for ongoing changes to the bitmap, |
| 1056 | * as we submit copies of pages anyways. |
| 1057 | */ |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1058 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1059 | ctx = kmalloc(sizeof(struct drbd_bm_aio_ctx), GFP_NOIO); |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1060 | if (!ctx) |
| 1061 | return -ENOMEM; |
| 1062 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1063 | *ctx = (struct drbd_bm_aio_ctx) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1064 | .device = device, |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1065 | .start_jif = jiffies, |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1066 | .in_flight = ATOMIC_INIT(1), |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1067 | .done = 0, |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 1068 | .flags = flags, |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1069 | .error = 0, |
| 1070 | .kref = { ATOMIC_INIT(2) }, |
| 1071 | }; |
| 1072 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1073 | if (!get_ldev_if_state(device, D_ATTACHING)) { /* put is in drbd_bm_aio_ctx_destroy() */ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1074 | drbd_err(device, "ASSERT FAILED: get_ldev_if_state() == 1 in bm_rw()\n"); |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1075 | kfree(ctx); |
| 1076 | return -ENODEV; |
| 1077 | } |
Philipp Reisner | 8fe39aa | 2013-11-22 13:22:13 +0100 | [diff] [blame] | 1078 | /* Here D_ATTACHING is sufficient since drbd_bm_read() is called only from |
| 1079 | drbd_adm_attach(), after device->ldev was assigned. */ |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1080 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1081 | if (0 == (ctx->flags & ~BM_AIO_READ)) |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1082 | WARN_ON(!(BM_LOCKED_MASK & b->bm_flags)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1083 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1084 | spin_lock_irq(&device->resource->req_lock); |
| 1085 | list_add_tail(&ctx->list, &device->pending_bitmap_io); |
| 1086 | spin_unlock_irq(&device->resource->req_lock); |
| 1087 | |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 1088 | num_pages = b->bm_number_of_pages; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1089 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1090 | now = jiffies; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1091 | |
| 1092 | /* let the layers below us try to merge these bios... */ |
Lars Ellenberg | 6850c44 | 2010-12-16 00:32:38 +0100 | [diff] [blame] | 1093 | for (i = 0; i < num_pages; i++) { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1094 | /* ignore completely unchanged pages */ |
| 1095 | if (lazy_writeout_upper_idx && i == lazy_writeout_upper_idx) |
| 1096 | break; |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1097 | if (!(flags & BM_AIO_READ)) { |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1098 | if ((flags & BM_AIO_WRITE_HINTED) && |
| 1099 | !test_and_clear_bit(BM_PAGE_HINT_WRITEOUT, |
| 1100 | &page_private(b->bm_pages[i]))) |
| 1101 | continue; |
Philipp Reisner | fef45d2 | 2012-08-14 11:46:59 +0200 | [diff] [blame] | 1102 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1103 | if (!(flags & BM_AIO_WRITE_ALL_PAGES) && |
Philipp Reisner | d1aa4d0 | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 1104 | bm_test_page_unchanged(b->bm_pages[i])) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1105 | dynamic_drbd_dbg(device, "skipped bm write for idx %u\n", i); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1106 | continue; |
| 1107 | } |
| 1108 | /* during lazy writeout, |
| 1109 | * ignore those pages not marked for lazy writeout. */ |
| 1110 | if (lazy_writeout_upper_idx && |
| 1111 | !bm_test_page_lazy_writeout(b->bm_pages[i])) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1112 | dynamic_drbd_dbg(device, "skipped bm lazy write for idx %u\n", i); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1113 | continue; |
| 1114 | } |
| 1115 | } |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1116 | atomic_inc(&ctx->in_flight); |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1117 | bm_page_io_async(ctx, i); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1118 | ++count; |
| 1119 | cond_resched(); |
| 1120 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1121 | |
Lars Ellenberg | 725a97e | 2010-12-19 11:29:55 +0100 | [diff] [blame] | 1122 | /* |
Andreas Gruenbacher | ed15b79 | 2014-09-11 14:29:06 +0200 | [diff] [blame] | 1123 | * We initialize ctx->in_flight to one to make sure drbd_bm_endio |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1124 | * will not set ctx->done early, and decrement / test it here. If there |
Lars Ellenberg | 725a97e | 2010-12-19 11:29:55 +0100 | [diff] [blame] | 1125 | * are still some bios in flight, we need to wait for them here. |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1126 | * If all IO is done already (or nothing had been submitted), there is |
| 1127 | * no need to wait. Still, we need to put the kref associated with the |
| 1128 | * "in_flight reached zero, all done" event. |
Lars Ellenberg | 725a97e | 2010-12-19 11:29:55 +0100 | [diff] [blame] | 1129 | */ |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1130 | if (!atomic_dec_and_test(&ctx->in_flight)) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1131 | wait_until_done_or_force_detached(device, device->ldev, &ctx->done); |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1132 | else |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1133 | kref_put(&ctx->kref, &drbd_bm_aio_ctx_destroy); |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1134 | |
Lars Ellenberg | c9d963a | 2011-02-21 15:10:23 +0100 | [diff] [blame] | 1135 | /* summary for global bitmap IO */ |
| 1136 | if (flags == 0) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1137 | drbd_info(device, "bitmap %s of %u pages took %lu jiffies\n", |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1138 | (flags & BM_AIO_READ) ? "READ" : "WRITE", |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 1139 | count, jiffies - now); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1140 | |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1141 | if (ctx->error) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1142 | drbd_alert(device, "we had at least one MD IO ERROR during bitmap IO\n"); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1143 | drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR); |
Philipp Reisner | d1f3779 | 2011-06-27 14:56:52 +0200 | [diff] [blame] | 1144 | err = -EIO; /* ctx->error ? */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1145 | } |
| 1146 | |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1147 | if (atomic_read(&ctx->in_flight)) |
Lars Ellenberg | 44edfb0 | 2012-09-27 13:03:45 +0200 | [diff] [blame] | 1148 | err = -EIO; /* Disk timeout/force-detach during IO... */ |
Philipp Reisner | 9e58c4d | 2011-06-27 15:29:16 +0200 | [diff] [blame] | 1149 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1150 | now = jiffies; |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1151 | if (flags & BM_AIO_READ) { |
Lars Ellenberg | 95a0f10 | 2010-12-15 08:59:09 +0100 | [diff] [blame] | 1152 | b->bm_set = bm_count_bits(b); |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1153 | drbd_info(device, "recounting of set bits took additional %lu jiffies\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1154 | jiffies - now); |
| 1155 | } |
| 1156 | now = b->bm_set; |
| 1157 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1158 | if ((flags & ~BM_AIO_READ) == 0) |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1159 | drbd_info(device, "%s (%lu bits) marked out-of-sync by on disk bit-map.\n", |
Lars Ellenberg | c9d963a | 2011-02-21 15:10:23 +0100 | [diff] [blame] | 1160 | ppsize(ppb, now << (BM_BLOCK_SHIFT-10)), now); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1161 | |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1162 | kref_put(&ctx->kref, &drbd_bm_aio_ctx_destroy); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1163 | return err; |
| 1164 | } |
| 1165 | |
| 1166 | /** |
| 1167 | * drbd_bm_read() - Read the whole bitmap from its on disk location. |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1168 | * @device: DRBD device. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1169 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1170 | int drbd_bm_read(struct drbd_device *device) __must_hold(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1171 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1172 | return bm_rw(device, BM_AIO_READ, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | /** |
| 1176 | * drbd_bm_write() - Write the whole bitmap to its on disk location. |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1177 | * @device: DRBD device. |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1178 | * |
| 1179 | * Will only write pages that have changed since last IO. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1180 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1181 | int drbd_bm_write(struct drbd_device *device) __must_hold(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1182 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1183 | return bm_rw(device, 0, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1184 | } |
| 1185 | |
| 1186 | /** |
Philipp Reisner | d1aa4d0 | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 1187 | * drbd_bm_write_all() - Write the whole bitmap to its on disk location. |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1188 | * @device: DRBD device. |
Philipp Reisner | d1aa4d0 | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 1189 | * |
| 1190 | * Will write all pages. |
| 1191 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1192 | int drbd_bm_write_all(struct drbd_device *device) __must_hold(local) |
Philipp Reisner | d1aa4d0 | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 1193 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1194 | return bm_rw(device, BM_AIO_WRITE_ALL_PAGES, 0); |
Philipp Reisner | d1aa4d0 | 2012-08-08 21:19:09 +0200 | [diff] [blame] | 1195 | } |
| 1196 | |
| 1197 | /** |
Lars Ellenberg | c7a58db | 2013-12-20 11:39:48 +0100 | [diff] [blame] | 1198 | * drbd_bm_write_lazy() - Write bitmap pages 0 to @upper_idx-1, if they have changed. |
| 1199 | * @device: DRBD device. |
| 1200 | * @upper_idx: 0: write all changed pages; +ve: page index to stop scanning for changed pages |
| 1201 | */ |
| 1202 | int drbd_bm_write_lazy(struct drbd_device *device, unsigned upper_idx) __must_hold(local) |
| 1203 | { |
| 1204 | return bm_rw(device, BM_AIO_COPY_PAGES, upper_idx); |
| 1205 | } |
| 1206 | |
| 1207 | /** |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 1208 | * drbd_bm_write_copy_pages() - Write the whole bitmap to its on disk location. |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1209 | * @device: DRBD device. |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 1210 | * |
| 1211 | * Will only write pages that have changed since last IO. |
| 1212 | * In contrast to drbd_bm_write(), this will copy the bitmap pages |
| 1213 | * to temporary writeout pages. It is intended to trigger a full write-out |
| 1214 | * while still allowing the bitmap to change, for example if a resync or online |
| 1215 | * verify is aborted due to a failed peer disk, while local IO continues, or |
| 1216 | * pending resync acks are still being processed. |
| 1217 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1218 | int drbd_bm_write_copy_pages(struct drbd_device *device) __must_hold(local) |
Lars Ellenberg | 0e8488a | 2012-04-25 23:06:45 +0200 | [diff] [blame] | 1219 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1220 | return bm_rw(device, BM_AIO_COPY_PAGES, 0); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1221 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1222 | |
Lars Ellenberg | a220d29 | 2012-05-07 12:07:18 +0200 | [diff] [blame] | 1223 | /** |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1224 | * drbd_bm_write_hinted() - Write bitmap pages with "hint" marks, if they have changed. |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1225 | * @device: DRBD device. |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1226 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1227 | int drbd_bm_write_hinted(struct drbd_device *device) __must_hold(local) |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1228 | { |
Lars Ellenberg | 4ce4926 | 2014-05-06 00:44:59 +0200 | [diff] [blame] | 1229 | return bm_rw(device, BM_AIO_WRITE_HINTED | BM_AIO_COPY_PAGES, 0); |
Lars Ellenberg | 45dfffe | 2011-02-21 13:21:00 +0100 | [diff] [blame] | 1230 | } |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1231 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1232 | /* NOTE |
| 1233 | * find_first_bit returns int, we return unsigned long. |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1234 | * For this to work on 32bit arch with bitnumbers > (1<<32), |
| 1235 | * we'd need to return u64, and get a whole lot of other places |
| 1236 | * fixed where we still use unsigned long. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1237 | * |
| 1238 | * this returns a bit number, NOT a sector! |
| 1239 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1240 | static unsigned long __bm_find_next(struct drbd_device *device, unsigned long bm_fo, |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1241 | const int find_zero_bit) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1242 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1243 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1244 | unsigned long *p_addr; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1245 | unsigned long bit_offset; |
| 1246 | unsigned i; |
| 1247 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1248 | |
| 1249 | if (bm_fo > b->bm_bits) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1250 | drbd_err(device, "bm_fo=%lu bm_bits=%lu\n", bm_fo, b->bm_bits); |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1251 | bm_fo = DRBD_END_OF_BITMAP; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1252 | } else { |
| 1253 | while (bm_fo < b->bm_bits) { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1254 | /* bit offset of the first bit in the page */ |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1255 | bit_offset = bm_fo & ~BITS_PER_PAGE_MASK; |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1256 | p_addr = __bm_map_pidx(b, bm_bit_to_page_idx(b, bm_fo)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1257 | |
| 1258 | if (find_zero_bit) |
Linus Torvalds | 7e599e6 | 2011-03-28 07:42:58 -0700 | [diff] [blame] | 1259 | i = find_next_zero_bit_le(p_addr, |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1260 | PAGE_SIZE*8, bm_fo & BITS_PER_PAGE_MASK); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1261 | else |
Linus Torvalds | 7e599e6 | 2011-03-28 07:42:58 -0700 | [diff] [blame] | 1262 | i = find_next_bit_le(p_addr, |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1263 | PAGE_SIZE*8, bm_fo & BITS_PER_PAGE_MASK); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1264 | |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1265 | __bm_unmap(p_addr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1266 | if (i < PAGE_SIZE*8) { |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1267 | bm_fo = bit_offset + i; |
| 1268 | if (bm_fo >= b->bm_bits) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1269 | break; |
| 1270 | goto found; |
| 1271 | } |
| 1272 | bm_fo = bit_offset + PAGE_SIZE*8; |
| 1273 | } |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1274 | bm_fo = DRBD_END_OF_BITMAP; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1275 | } |
| 1276 | found: |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1277 | return bm_fo; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1278 | } |
| 1279 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1280 | static unsigned long bm_find_next(struct drbd_device *device, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1281 | unsigned long bm_fo, const int find_zero_bit) |
| 1282 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1283 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 4b0715f | 2010-12-14 15:13:04 +0100 | [diff] [blame] | 1284 | unsigned long i = DRBD_END_OF_BITMAP; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1285 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1286 | if (!expect(b)) |
| 1287 | return i; |
| 1288 | if (!expect(b->bm_pages)) |
| 1289 | return i; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1290 | |
| 1291 | spin_lock_irq(&b->bm_lock); |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1292 | if (BM_DONT_TEST & b->bm_flags) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1293 | bm_print_lock_info(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1294 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1295 | i = __bm_find_next(device, bm_fo, find_zero_bit); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1296 | |
| 1297 | spin_unlock_irq(&b->bm_lock); |
| 1298 | return i; |
| 1299 | } |
| 1300 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1301 | unsigned long drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1302 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1303 | return bm_find_next(device, bm_fo, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1304 | } |
| 1305 | |
| 1306 | #if 0 |
| 1307 | /* not yet needed for anything. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1308 | unsigned long drbd_bm_find_next_zero(struct drbd_device *device, unsigned long bm_fo) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1309 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1310 | return bm_find_next(device, bm_fo, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1311 | } |
| 1312 | #endif |
| 1313 | |
| 1314 | /* does not spin_lock_irqsave. |
| 1315 | * you must take drbd_bm_lock() first */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1316 | unsigned long _drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1317 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1318 | /* WARN_ON(!(BM_DONT_SET & device->b->bm_flags)); */ |
| 1319 | return __bm_find_next(device, bm_fo, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1320 | } |
| 1321 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1322 | unsigned long _drbd_bm_find_next_zero(struct drbd_device *device, unsigned long bm_fo) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1323 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1324 | /* WARN_ON(!(BM_DONT_SET & device->b->bm_flags)); */ |
| 1325 | return __bm_find_next(device, bm_fo, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1326 | } |
| 1327 | |
| 1328 | /* returns number of bits actually changed. |
| 1329 | * for val != 0, we change 0 -> 1, return code positive |
| 1330 | * for val == 0, we change 1 -> 0, return code negative |
| 1331 | * wants bitnr, not sector. |
| 1332 | * expected to be called for only a few bits (e - s about BITS_PER_LONG). |
| 1333 | * Must hold bitmap lock already. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1334 | static int __bm_change_bits_to(struct drbd_device *device, const unsigned long s, |
Lars Ellenberg | 829c608 | 2011-06-03 21:18:13 +0200 | [diff] [blame] | 1335 | unsigned long e, int val) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1336 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1337 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1338 | unsigned long *p_addr = NULL; |
| 1339 | unsigned long bitnr; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1340 | unsigned int last_page_nr = -1U; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1341 | int c = 0; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1342 | int changed_total = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1343 | |
| 1344 | if (e >= b->bm_bits) { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1345 | drbd_err(device, "ASSERT FAILED: bit_s=%lu bit_e=%lu bm_bits=%lu\n", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1346 | s, e, b->bm_bits); |
| 1347 | e = b->bm_bits ? b->bm_bits -1 : 0; |
| 1348 | } |
| 1349 | for (bitnr = s; bitnr <= e; bitnr++) { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1350 | unsigned int page_nr = bm_bit_to_page_idx(b, bitnr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1351 | if (page_nr != last_page_nr) { |
| 1352 | if (p_addr) |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1353 | __bm_unmap(p_addr); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1354 | if (c < 0) |
| 1355 | bm_set_page_lazy_writeout(b->bm_pages[last_page_nr]); |
| 1356 | else if (c > 0) |
| 1357 | bm_set_page_need_writeout(b->bm_pages[last_page_nr]); |
| 1358 | changed_total += c; |
| 1359 | c = 0; |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1360 | p_addr = __bm_map_pidx(b, page_nr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1361 | last_page_nr = page_nr; |
| 1362 | } |
| 1363 | if (val) |
Linus Torvalds | 7e599e6 | 2011-03-28 07:42:58 -0700 | [diff] [blame] | 1364 | c += (0 == __test_and_set_bit_le(bitnr & BITS_PER_PAGE_MASK, p_addr)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1365 | else |
Linus Torvalds | 7e599e6 | 2011-03-28 07:42:58 -0700 | [diff] [blame] | 1366 | c -= (0 != __test_and_clear_bit_le(bitnr & BITS_PER_PAGE_MASK, p_addr)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1367 | } |
| 1368 | if (p_addr) |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1369 | __bm_unmap(p_addr); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1370 | if (c < 0) |
| 1371 | bm_set_page_lazy_writeout(b->bm_pages[last_page_nr]); |
| 1372 | else if (c > 0) |
| 1373 | bm_set_page_need_writeout(b->bm_pages[last_page_nr]); |
| 1374 | changed_total += c; |
| 1375 | b->bm_set += changed_total; |
| 1376 | return changed_total; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1377 | } |
| 1378 | |
| 1379 | /* returns number of bits actually changed. |
| 1380 | * for val != 0, we change 0 -> 1, return code positive |
| 1381 | * for val == 0, we change 1 -> 0, return code negative |
| 1382 | * wants bitnr, not sector */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1383 | static int bm_change_bits_to(struct drbd_device *device, const unsigned long s, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1384 | const unsigned long e, int val) |
| 1385 | { |
| 1386 | unsigned long flags; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1387 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1388 | int c = 0; |
| 1389 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1390 | if (!expect(b)) |
| 1391 | return 1; |
| 1392 | if (!expect(b->bm_pages)) |
| 1393 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1394 | |
| 1395 | spin_lock_irqsave(&b->bm_lock, flags); |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1396 | if ((val ? BM_DONT_SET : BM_DONT_CLEAR) & b->bm_flags) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1397 | bm_print_lock_info(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1398 | |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1399 | c = __bm_change_bits_to(device, s, e, val); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1400 | |
| 1401 | spin_unlock_irqrestore(&b->bm_lock, flags); |
| 1402 | return c; |
| 1403 | } |
| 1404 | |
| 1405 | /* returns number of bits changed 0 -> 1 */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1406 | int drbd_bm_set_bits(struct drbd_device *device, const unsigned long s, const unsigned long e) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1407 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1408 | return bm_change_bits_to(device, s, e, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1409 | } |
| 1410 | |
| 1411 | /* returns number of bits changed 1 -> 0 */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1412 | int drbd_bm_clear_bits(struct drbd_device *device, const unsigned long s, const unsigned long e) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1413 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1414 | return -bm_change_bits_to(device, s, e, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1415 | } |
| 1416 | |
| 1417 | /* sets all bits in full words, |
| 1418 | * from first_word up to, but not including, last_word */ |
| 1419 | static inline void bm_set_full_words_within_one_page(struct drbd_bitmap *b, |
| 1420 | int page_nr, int first_word, int last_word) |
| 1421 | { |
| 1422 | int i; |
| 1423 | int bits; |
Lars Ellenberg | 22d8114 | 2011-09-26 09:58:04 +0200 | [diff] [blame] | 1424 | int changed = 0; |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1425 | unsigned long *paddr = kmap_atomic(b->bm_pages[page_nr]); |
Lars Ellenberg | 5fb3bc4 | 2015-03-20 16:15:24 +0100 | [diff] [blame^] | 1426 | |
| 1427 | /* I think it is more cache line friendly to hweight_long then set to ~0UL, |
| 1428 | * than to first bitmap_weight() all words, then bitmap_fill() all words */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1429 | for (i = first_word; i < last_word; i++) { |
| 1430 | bits = hweight_long(paddr[i]); |
| 1431 | paddr[i] = ~0UL; |
Lars Ellenberg | 22d8114 | 2011-09-26 09:58:04 +0200 | [diff] [blame] | 1432 | changed += BITS_PER_LONG - bits; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1433 | } |
Cong Wang | cfd8005 | 2011-11-25 23:14:18 +0800 | [diff] [blame] | 1434 | kunmap_atomic(paddr); |
Lars Ellenberg | 22d8114 | 2011-09-26 09:58:04 +0200 | [diff] [blame] | 1435 | if (changed) { |
| 1436 | /* We only need lazy writeout, the information is still in the |
| 1437 | * remote bitmap as well, and is reconstructed during the next |
| 1438 | * bitmap exchange, if lost locally due to a crash. */ |
| 1439 | bm_set_page_lazy_writeout(b->bm_pages[page_nr]); |
| 1440 | b->bm_set += changed; |
| 1441 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1442 | } |
| 1443 | |
Lars Ellenberg | 829c608 | 2011-06-03 21:18:13 +0200 | [diff] [blame] | 1444 | /* Same thing as drbd_bm_set_bits, |
| 1445 | * but more efficient for a large bit range. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1446 | * You must first drbd_bm_lock(). |
| 1447 | * Can be called to set the whole bitmap in one go. |
| 1448 | * Sets bits from s to e _inclusive_. */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1449 | void _drbd_bm_set_bits(struct drbd_device *device, const unsigned long s, const unsigned long e) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1450 | { |
| 1451 | /* First set_bit from the first bit (s) |
| 1452 | * up to the next long boundary (sl), |
| 1453 | * then assign full words up to the last long boundary (el), |
| 1454 | * then set_bit up to and including the last bit (e). |
| 1455 | * |
| 1456 | * Do not use memset, because we must account for changes, |
| 1457 | * so we need to loop over the words with hweight() anyways. |
| 1458 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1459 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1460 | unsigned long sl = ALIGN(s,BITS_PER_LONG); |
| 1461 | unsigned long el = (e+1) & ~((unsigned long)BITS_PER_LONG-1); |
| 1462 | int first_page; |
| 1463 | int last_page; |
| 1464 | int page_nr; |
| 1465 | int first_word; |
| 1466 | int last_word; |
| 1467 | |
| 1468 | if (e - s <= 3*BITS_PER_LONG) { |
| 1469 | /* don't bother; el and sl may even be wrong. */ |
Lars Ellenberg | 829c608 | 2011-06-03 21:18:13 +0200 | [diff] [blame] | 1470 | spin_lock_irq(&b->bm_lock); |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1471 | __bm_change_bits_to(device, s, e, 1); |
Lars Ellenberg | 829c608 | 2011-06-03 21:18:13 +0200 | [diff] [blame] | 1472 | spin_unlock_irq(&b->bm_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1473 | return; |
| 1474 | } |
| 1475 | |
| 1476 | /* difference is large enough that we can trust sl and el */ |
| 1477 | |
Lars Ellenberg | 829c608 | 2011-06-03 21:18:13 +0200 | [diff] [blame] | 1478 | spin_lock_irq(&b->bm_lock); |
| 1479 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1480 | /* bits filling the current long */ |
| 1481 | if (sl) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1482 | __bm_change_bits_to(device, s, sl-1, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1483 | |
| 1484 | first_page = sl >> (3 + PAGE_SHIFT); |
| 1485 | last_page = el >> (3 + PAGE_SHIFT); |
| 1486 | |
| 1487 | /* MLPP: modulo longs per page */ |
| 1488 | /* LWPP: long words per page */ |
| 1489 | first_word = MLPP(sl >> LN2_BPL); |
| 1490 | last_word = LWPP; |
| 1491 | |
| 1492 | /* first and full pages, unless first page == last page */ |
| 1493 | for (page_nr = first_page; page_nr < last_page; page_nr++) { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1494 | bm_set_full_words_within_one_page(device->bitmap, page_nr, first_word, last_word); |
Lars Ellenberg | 8ccee20 | 2011-06-06 11:31:42 +0200 | [diff] [blame] | 1495 | spin_unlock_irq(&b->bm_lock); |
| 1496 | cond_resched(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1497 | first_word = 0; |
Lars Ellenberg | 8ccee20 | 2011-06-06 11:31:42 +0200 | [diff] [blame] | 1498 | spin_lock_irq(&b->bm_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1499 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1500 | /* last page (respectively only page, for first page == last page) */ |
| 1501 | last_word = MLPP(el >> LN2_BPL); |
Lars Ellenberg | 4eccc57 | 2012-06-08 13:18:51 +0200 | [diff] [blame] | 1502 | |
| 1503 | /* consider bitmap->bm_bits = 32768, bitmap->bm_number_of_pages = 1. (or multiples). |
| 1504 | * ==> e = 32767, el = 32768, last_page = 2, |
| 1505 | * and now last_word = 0. |
| 1506 | * We do not want to touch last_page in this case, |
| 1507 | * as we did not allocate it, it is not present in bitmap->bm_pages. |
| 1508 | */ |
| 1509 | if (last_word) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1510 | bm_set_full_words_within_one_page(device->bitmap, last_page, first_word, last_word); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1511 | |
| 1512 | /* possibly trailing bits. |
| 1513 | * example: (e & 63) == 63, el will be e+1. |
| 1514 | * if that even was the very last bit, |
| 1515 | * it would trigger an assert in __bm_change_bits_to() |
| 1516 | */ |
| 1517 | if (el <= e) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1518 | __bm_change_bits_to(device, el, e, 1); |
Lars Ellenberg | 829c608 | 2011-06-03 21:18:13 +0200 | [diff] [blame] | 1519 | spin_unlock_irq(&b->bm_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1520 | } |
| 1521 | |
| 1522 | /* returns bit state |
| 1523 | * wants bitnr, NOT sector. |
| 1524 | * inherently racy... area needs to be locked by means of {al,rs}_lru |
| 1525 | * 1 ... bit set |
| 1526 | * 0 ... bit not set |
| 1527 | * -1 ... first out of bounds access, stop testing for bits! |
| 1528 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1529 | int drbd_bm_test_bit(struct drbd_device *device, const unsigned long bitnr) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1530 | { |
| 1531 | unsigned long flags; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1532 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1533 | unsigned long *p_addr; |
| 1534 | int i; |
| 1535 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1536 | if (!expect(b)) |
| 1537 | return 0; |
| 1538 | if (!expect(b->bm_pages)) |
| 1539 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1540 | |
| 1541 | spin_lock_irqsave(&b->bm_lock, flags); |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1542 | if (BM_DONT_TEST & b->bm_flags) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1543 | bm_print_lock_info(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1544 | if (bitnr < b->bm_bits) { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1545 | p_addr = bm_map_pidx(b, bm_bit_to_page_idx(b, bitnr)); |
Linus Torvalds | 7e599e6 | 2011-03-28 07:42:58 -0700 | [diff] [blame] | 1546 | i = test_bit_le(bitnr & BITS_PER_PAGE_MASK, p_addr) ? 1 : 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1547 | bm_unmap(p_addr); |
| 1548 | } else if (bitnr == b->bm_bits) { |
| 1549 | i = -1; |
| 1550 | } else { /* (bitnr > b->bm_bits) */ |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1551 | drbd_err(device, "bitnr=%lu > bm_bits=%lu\n", bitnr, b->bm_bits); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1552 | i = 0; |
| 1553 | } |
| 1554 | |
| 1555 | spin_unlock_irqrestore(&b->bm_lock, flags); |
| 1556 | return i; |
| 1557 | } |
| 1558 | |
| 1559 | /* returns number of bits set in the range [s, e] */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1560 | int drbd_bm_count_bits(struct drbd_device *device, const unsigned long s, const unsigned long e) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1561 | { |
| 1562 | unsigned long flags; |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1563 | struct drbd_bitmap *b = device->bitmap; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1564 | unsigned long *p_addr = NULL; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1565 | unsigned long bitnr; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1566 | unsigned int page_nr = -1U; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1567 | int c = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1568 | |
| 1569 | /* If this is called without a bitmap, that is a bug. But just to be |
| 1570 | * robust in case we screwed up elsewhere, in that case pretend there |
| 1571 | * was one dirty bit in the requested area, so we won't try to do a |
| 1572 | * local read there (no bitmap probably implies no disk) */ |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1573 | if (!expect(b)) |
| 1574 | return 1; |
| 1575 | if (!expect(b->bm_pages)) |
| 1576 | return 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1577 | |
| 1578 | spin_lock_irqsave(&b->bm_lock, flags); |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1579 | if (BM_DONT_TEST & b->bm_flags) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1580 | bm_print_lock_info(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1581 | for (bitnr = s; bitnr <= e; bitnr++) { |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1582 | unsigned int idx = bm_bit_to_page_idx(b, bitnr); |
| 1583 | if (page_nr != idx) { |
| 1584 | page_nr = idx; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1585 | if (p_addr) |
| 1586 | bm_unmap(p_addr); |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1587 | p_addr = bm_map_pidx(b, idx); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1588 | } |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1589 | if (expect(bitnr < b->bm_bits)) |
Linus Torvalds | 7e599e6 | 2011-03-28 07:42:58 -0700 | [diff] [blame] | 1590 | c += (0 != test_bit_le(bitnr - (page_nr << (PAGE_SHIFT+3)), p_addr)); |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1591 | else |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1592 | drbd_err(device, "bitnr=%lu bm_bits=%lu\n", bitnr, b->bm_bits); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1593 | } |
| 1594 | if (p_addr) |
| 1595 | bm_unmap(p_addr); |
| 1596 | spin_unlock_irqrestore(&b->bm_lock, flags); |
| 1597 | return c; |
| 1598 | } |
| 1599 | |
| 1600 | |
| 1601 | /* inherently racy... |
| 1602 | * return value may be already out-of-date when this function returns. |
| 1603 | * but the general usage is that this is only use during a cstate when bits are |
| 1604 | * only cleared, not set, and typically only care for the case when the return |
| 1605 | * value is zero, or we already "locked" this "bitmap extent" by other means. |
| 1606 | * |
| 1607 | * enr is bm-extent number, since we chose to name one sector (512 bytes) |
| 1608 | * worth of the bitmap a "bitmap extent". |
| 1609 | * |
| 1610 | * TODO |
| 1611 | * I think since we use it like a reference count, we should use the real |
| 1612 | * reference count of some bitmap extent element from some lru instead... |
| 1613 | * |
| 1614 | */ |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1615 | int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1616 | { |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1617 | struct drbd_bitmap *b = device->bitmap; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1618 | int count, s, e; |
| 1619 | unsigned long flags; |
| 1620 | unsigned long *p_addr, *bm; |
| 1621 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1622 | if (!expect(b)) |
| 1623 | return 0; |
| 1624 | if (!expect(b->bm_pages)) |
| 1625 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1626 | |
| 1627 | spin_lock_irqsave(&b->bm_lock, flags); |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 1628 | if (BM_DONT_TEST & b->bm_flags) |
Andreas Gruenbacher | b30ab79 | 2011-07-03 13:26:43 +0200 | [diff] [blame] | 1629 | bm_print_lock_info(device); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1630 | |
| 1631 | s = S2W(enr); |
| 1632 | e = min((size_t)S2W(enr+1), b->bm_words); |
| 1633 | count = 0; |
| 1634 | if (s < b->bm_words) { |
| 1635 | int n = e-s; |
Lars Ellenberg | 19f843a | 2010-12-15 08:59:11 +0100 | [diff] [blame] | 1636 | p_addr = bm_map_pidx(b, bm_word_to_page_idx(b, s)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1637 | bm = p_addr + MLPP(s); |
Lars Ellenberg | 5fb3bc4 | 2015-03-20 16:15:24 +0100 | [diff] [blame^] | 1638 | count += bitmap_weight(bm, n * BITS_PER_LONG); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1639 | bm_unmap(p_addr); |
| 1640 | } else { |
Andreas Gruenbacher | d018017 | 2011-07-03 17:53:52 +0200 | [diff] [blame] | 1641 | drbd_err(device, "start offset (%d) too large in drbd_bm_e_weight\n", s); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1642 | } |
| 1643 | spin_unlock_irqrestore(&b->bm_lock, flags); |
| 1644 | return count; |
| 1645 | } |