NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1 | /* |
| 2 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 |
| 3 | * |
| 4 | * bitmap_create - sets up the bitmap structure |
| 5 | * bitmap_destroy - destroys the bitmap structure |
| 6 | * |
| 7 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: |
| 8 | * - added disk storage for bitmap |
| 9 | * - changes to allow various bitmap chunk sizes |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * Still to do: |
| 14 | * |
| 15 | * flush after percent set rather than just time based. (maybe both). |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 16 | */ |
| 17 | |
NeilBrown | bff6197 | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 18 | #include <linux/blkdev.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 20 | #include <linux/errno.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/init.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 23 | #include <linux/timer.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/list.h> |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/mount.h> |
| 28 | #include <linux/buffer_head.h> |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 29 | #include <linux/seq_file.h> |
NeilBrown | 43b2e5d | 2009-03-31 14:33:13 +1100 | [diff] [blame] | 30 | #include "md.h" |
Christoph Hellwig | ef740c3 | 2009-03-31 14:27:03 +1100 | [diff] [blame] | 31 | #include "bitmap.h" |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 32 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 33 | static inline char *bmname(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 34 | { |
| 35 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; |
| 36 | } |
| 37 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 38 | /* |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 39 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) |
| 40 | * |
| 41 | * 1) check to see if this page is allocated, if it's not then try to alloc |
| 42 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the |
| 43 | * page pointer directly as a counter |
| 44 | * |
| 45 | * if we find our page, we increment the page's refcount so that it stays |
| 46 | * allocated while we're using it |
| 47 | */ |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 48 | static int bitmap_checkpage(struct bitmap *bitmap, |
| 49 | unsigned long page, int create) |
NeilBrown | ee305ac | 2009-09-23 18:06:44 +1000 | [diff] [blame] | 50 | __releases(bitmap->lock) |
| 51 | __acquires(bitmap->lock) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 52 | { |
| 53 | unsigned char *mappage; |
| 54 | |
| 55 | if (page >= bitmap->pages) { |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 56 | /* This can happen if bitmap_start_sync goes beyond |
| 57 | * End-of-device while looking for a whole page. |
| 58 | * It is harmless. |
| 59 | */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 60 | return -EINVAL; |
| 61 | } |
| 62 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 63 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
| 64 | return 0; |
| 65 | |
| 66 | if (bitmap->bp[page].map) /* page is already allocated, just return */ |
| 67 | return 0; |
| 68 | |
| 69 | if (!create) |
| 70 | return -ENOENT; |
| 71 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 72 | /* this page has not been allocated yet */ |
| 73 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 74 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 75 | mappage = kzalloc(PAGE_SIZE, GFP_NOIO); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 76 | spin_lock_irq(&bitmap->lock); |
| 77 | |
| 78 | if (mappage == NULL) { |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 79 | pr_debug("%s: bitmap map page allocation failed, hijacking\n", |
| 80 | bmname(bitmap)); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 81 | /* failed - set the hijacked flag so that we can use the |
| 82 | * pointer as a counter */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 83 | if (!bitmap->bp[page].map) |
| 84 | bitmap->bp[page].hijacked = 1; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 85 | } else if (bitmap->bp[page].map || |
| 86 | bitmap->bp[page].hijacked) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 87 | /* somebody beat us to getting the page */ |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 88 | kfree(mappage); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 89 | return 0; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 90 | } else { |
| 91 | |
| 92 | /* no page was in place and we have one, so install it */ |
| 93 | |
| 94 | bitmap->bp[page].map = mappage; |
| 95 | bitmap->missing_pages--; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 96 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 97 | return 0; |
| 98 | } |
| 99 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 100 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
| 101 | /* if page was hijacked, unmark the flag so it might get alloced next time */ |
| 102 | /* Note: lock should be held when calling this */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 103 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 104 | { |
| 105 | char *ptr; |
| 106 | |
| 107 | if (bitmap->bp[page].count) /* page is still busy */ |
| 108 | return; |
| 109 | |
| 110 | /* page is no longer in use, it can be released */ |
| 111 | |
| 112 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ |
| 113 | bitmap->bp[page].hijacked = 0; |
| 114 | bitmap->bp[page].map = NULL; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 115 | } else { |
| 116 | /* normal case, free the page */ |
| 117 | ptr = bitmap->bp[page].map; |
| 118 | bitmap->bp[page].map = NULL; |
| 119 | bitmap->missing_pages++; |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 120 | kfree(ptr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 121 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 122 | } |
| 123 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 124 | /* |
| 125 | * bitmap file handling - read and write the bitmap file and its superblock |
| 126 | */ |
| 127 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 128 | /* |
| 129 | * basic page I/O operations |
| 130 | */ |
| 131 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 132 | /* IO operations when bitmap is stored near all superblocks */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 133 | static int read_sb_page(struct mddev *mddev, loff_t offset, |
| 134 | struct page *page, |
| 135 | unsigned long index, int size) |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 136 | { |
| 137 | /* choose a good rdev and read the page from there */ |
| 138 | |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 139 | struct md_rdev *rdev; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 140 | sector_t target; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 141 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 142 | rdev_for_each(rdev, mddev) { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 143 | if (! test_bit(In_sync, &rdev->flags) |
| 144 | || test_bit(Faulty, &rdev->flags)) |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 145 | continue; |
| 146 | |
Jonathan Brassow | ccebd4c | 2011-01-14 09:14:33 +1100 | [diff] [blame] | 147 | target = offset + index * (PAGE_SIZE/512); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 148 | |
NeilBrown | 2b19336 | 2010-10-27 15:16:40 +1100 | [diff] [blame] | 149 | if (sync_page_io(rdev, target, |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 150 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
Jonathan Brassow | ccebd4c | 2011-01-14 09:14:33 +1100 | [diff] [blame] | 151 | page, READ, true)) { |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 152 | page->index = index; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 153 | return 0; |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 154 | } |
| 155 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 156 | return -EIO; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 157 | } |
| 158 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 159 | static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 160 | { |
| 161 | /* Iterate the disks of an mddev, using rcu to protect access to the |
| 162 | * linked list, and raising the refcount of devices we return to ensure |
| 163 | * they don't disappear while in use. |
| 164 | * As devices are only added or removed when raid_disk is < 0 and |
| 165 | * nr_pending is 0 and In_sync is clear, the entries we return will |
| 166 | * still be in the same position on the list when we re-enter |
| 167 | * list_for_each_continue_rcu. |
| 168 | */ |
| 169 | struct list_head *pos; |
| 170 | rcu_read_lock(); |
| 171 | if (rdev == NULL) |
| 172 | /* start at the beginning */ |
| 173 | pos = &mddev->disks; |
| 174 | else { |
| 175 | /* release the previous rdev and start from there. */ |
| 176 | rdev_dec_pending(rdev, mddev); |
| 177 | pos = &rdev->same_set; |
| 178 | } |
| 179 | list_for_each_continue_rcu(pos, &mddev->disks) { |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 180 | rdev = list_entry(pos, struct md_rdev, same_set); |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 181 | if (rdev->raid_disk >= 0 && |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 182 | !test_bit(Faulty, &rdev->flags)) { |
| 183 | /* this is a usable devices */ |
| 184 | atomic_inc(&rdev->nr_pending); |
| 185 | rcu_read_unlock(); |
| 186 | return rdev; |
| 187 | } |
| 188 | } |
| 189 | rcu_read_unlock(); |
| 190 | return NULL; |
| 191 | } |
| 192 | |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 193 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 194 | { |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 195 | struct md_rdev *rdev = NULL; |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 196 | struct block_device *bdev; |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 197 | struct mddev *mddev = bitmap->mddev; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 198 | struct bitmap_storage *store = &bitmap->storage; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 199 | |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 200 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 201 | int size = PAGE_SIZE; |
| 202 | loff_t offset = mddev->bitmap_info.offset; |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 203 | |
| 204 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; |
| 205 | |
NeilBrown | 9b1215c | 2012-05-22 13:55:11 +1000 | [diff] [blame] | 206 | if (page->index == store->file_pages-1) { |
| 207 | int last_page_size = store->bytes & (PAGE_SIZE-1); |
| 208 | if (last_page_size == 0) |
| 209 | last_page_size = PAGE_SIZE; |
| 210 | size = roundup(last_page_size, |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 211 | bdev_logical_block_size(bdev)); |
NeilBrown | 9b1215c | 2012-05-22 13:55:11 +1000 | [diff] [blame] | 212 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 213 | /* Just make sure we aren't corrupting data or |
| 214 | * metadata |
| 215 | */ |
| 216 | if (mddev->external) { |
| 217 | /* Bitmap could be anywhere. */ |
| 218 | if (rdev->sb_start + offset + (page->index |
| 219 | * (PAGE_SIZE/512)) |
| 220 | > rdev->data_offset |
| 221 | && |
| 222 | rdev->sb_start + offset |
| 223 | < (rdev->data_offset + mddev->dev_sectors |
| 224 | + (PAGE_SIZE/512))) |
| 225 | goto bad_alignment; |
| 226 | } else if (offset < 0) { |
| 227 | /* DATA BITMAP METADATA */ |
| 228 | if (offset |
| 229 | + (long)(page->index * (PAGE_SIZE/512)) |
| 230 | + size/512 > 0) |
| 231 | /* bitmap runs in to metadata */ |
| 232 | goto bad_alignment; |
| 233 | if (rdev->data_offset + mddev->dev_sectors |
| 234 | > rdev->sb_start + offset) |
| 235 | /* data runs in to bitmap */ |
| 236 | goto bad_alignment; |
| 237 | } else if (rdev->sb_start < rdev->data_offset) { |
| 238 | /* METADATA BITMAP DATA */ |
| 239 | if (rdev->sb_start |
| 240 | + offset |
| 241 | + page->index*(PAGE_SIZE/512) + size/512 |
| 242 | > rdev->data_offset) |
| 243 | /* bitmap runs in to data */ |
| 244 | goto bad_alignment; |
| 245 | } else { |
| 246 | /* DATA METADATA BITMAP - no problems */ |
| 247 | } |
| 248 | md_super_write(mddev, rdev, |
| 249 | rdev->sb_start + offset |
| 250 | + page->index * (PAGE_SIZE/512), |
| 251 | size, |
| 252 | page); |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 253 | } |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 254 | |
| 255 | if (wait) |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 256 | md_super_wait(mddev); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 257 | return 0; |
NeilBrown | 4b80991 | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 258 | |
| 259 | bad_alignment: |
NeilBrown | 4b80991 | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 260 | return -EINVAL; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 261 | } |
| 262 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 263 | static void bitmap_file_kick(struct bitmap *bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 264 | /* |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 265 | * write out a page to a file |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 266 | */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 267 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 268 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 269 | struct buffer_head *bh; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 270 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 271 | if (bitmap->storage.file == NULL) { |
NeilBrown | f0d76d7 | 2007-07-17 04:06:12 -0700 | [diff] [blame] | 272 | switch (write_sb_page(bitmap, page, wait)) { |
| 273 | case -EINVAL: |
| 274 | bitmap->flags |= BITMAP_WRITE_ERROR; |
NeilBrown | f0d76d7 | 2007-07-17 04:06:12 -0700 | [diff] [blame] | 275 | } |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 276 | } else { |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 277 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 278 | bh = page_buffers(page); |
NeilBrown | c708443 | 2006-01-06 00:20:45 -0800 | [diff] [blame] | 279 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 280 | while (bh && bh->b_blocknr) { |
| 281 | atomic_inc(&bitmap->pending_writes); |
| 282 | set_buffer_locked(bh); |
| 283 | set_buffer_mapped(bh); |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 284 | submit_bh(WRITE | REQ_SYNC, bh); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 285 | bh = bh->b_this_page; |
| 286 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 287 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 288 | if (wait) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 289 | wait_event(bitmap->write_wait, |
| 290 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 291 | } |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 292 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 293 | bitmap_file_kick(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 294 | } |
| 295 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 296 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 297 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 298 | struct bitmap *bitmap = bh->b_private; |
| 299 | unsigned long flags; |
| 300 | |
| 301 | if (!uptodate) { |
| 302 | spin_lock_irqsave(&bitmap->lock, flags); |
| 303 | bitmap->flags |= BITMAP_WRITE_ERROR; |
| 304 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 305 | } |
| 306 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
| 307 | wake_up(&bitmap->write_wait); |
| 308 | } |
| 309 | |
| 310 | /* copied from buffer.c */ |
| 311 | static void |
| 312 | __clear_page_buffers(struct page *page) |
| 313 | { |
| 314 | ClearPagePrivate(page); |
| 315 | set_page_private(page, 0); |
| 316 | page_cache_release(page); |
| 317 | } |
| 318 | static void free_buffers(struct page *page) |
| 319 | { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 320 | struct buffer_head *bh; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 321 | |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 322 | if (!PagePrivate(page)) |
| 323 | return; |
| 324 | |
| 325 | bh = page_buffers(page); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 326 | while (bh) { |
| 327 | struct buffer_head *next = bh->b_this_page; |
| 328 | free_buffer_head(bh); |
| 329 | bh = next; |
| 330 | } |
| 331 | __clear_page_buffers(page); |
| 332 | put_page(page); |
| 333 | } |
| 334 | |
| 335 | /* read a page from a file. |
| 336 | * We both read the page, and attach buffers to the page to record the |
| 337 | * address of each block (using bmap). These addresses will be used |
| 338 | * to write the block later, completely bypassing the filesystem. |
| 339 | * This usage is similar to how swap files are handled, and allows us |
| 340 | * to write to a file with no concerns of memory allocation failing. |
| 341 | */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 342 | static int read_page(struct file *file, unsigned long index, |
| 343 | struct bitmap *bitmap, |
| 344 | unsigned long count, |
| 345 | struct page *page) |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 346 | { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 347 | int ret = 0; |
Josef Sipek | c649bb9 | 2006-12-08 02:37:19 -0800 | [diff] [blame] | 348 | struct inode *inode = file->f_path.dentry->d_inode; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 349 | struct buffer_head *bh; |
| 350 | sector_t block; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 351 | |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 352 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
| 353 | (unsigned long long)index << PAGE_SHIFT); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 354 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 355 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
| 356 | if (!bh) { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 357 | ret = -ENOMEM; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 358 | goto out; |
| 359 | } |
| 360 | attach_page_buffers(page, bh); |
| 361 | block = index << (PAGE_SHIFT - inode->i_blkbits); |
| 362 | while (bh) { |
| 363 | if (count == 0) |
| 364 | bh->b_blocknr = 0; |
| 365 | else { |
| 366 | bh->b_blocknr = bmap(inode, block); |
| 367 | if (bh->b_blocknr == 0) { |
| 368 | /* Cannot use this file! */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 369 | ret = -EINVAL; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 370 | goto out; |
| 371 | } |
| 372 | bh->b_bdev = inode->i_sb->s_bdev; |
| 373 | if (count < (1<<inode->i_blkbits)) |
| 374 | count = 0; |
| 375 | else |
| 376 | count -= (1<<inode->i_blkbits); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 377 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 378 | bh->b_end_io = end_bitmap_write; |
| 379 | bh->b_private = bitmap; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 380 | atomic_inc(&bitmap->pending_writes); |
| 381 | set_buffer_locked(bh); |
| 382 | set_buffer_mapped(bh); |
| 383 | submit_bh(READ, bh); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 384 | } |
| 385 | block++; |
| 386 | bh = bh->b_this_page; |
| 387 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 388 | page->index = index; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 389 | |
| 390 | wait_event(bitmap->write_wait, |
| 391 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 392 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 393 | ret = -EIO; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 394 | out: |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 395 | if (ret) |
| 396 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %d\n", |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 397 | (int)PAGE_SIZE, |
| 398 | (unsigned long long)index << PAGE_SHIFT, |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 399 | ret); |
| 400 | return ret; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | /* |
| 404 | * bitmap file superblock operations |
| 405 | */ |
| 406 | |
| 407 | /* update the event counter and sync the superblock to disk */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 408 | void bitmap_update_sb(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 409 | { |
| 410 | bitmap_super_t *sb; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 411 | |
| 412 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 413 | return; |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 414 | if (bitmap->mddev->bitmap_info.external) |
| 415 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 416 | if (!bitmap->storage.sb_page) /* no superblock */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 417 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 418 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 419 | sb->events = cpu_to_le64(bitmap->mddev->events); |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 420 | if (bitmap->mddev->events < bitmap->events_cleared) |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 421 | /* rocking back to read-only */ |
| 422 | bitmap->events_cleared = bitmap->mddev->events; |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 423 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
| 424 | sb->state = cpu_to_le32(bitmap->flags); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 425 | /* Just in case these have been changed via sysfs: */ |
| 426 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); |
| 427 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 428 | kunmap_atomic(sb); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 429 | write_page(bitmap, bitmap->storage.sb_page, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | /* print out the bitmap file superblock */ |
| 433 | void bitmap_print_sb(struct bitmap *bitmap) |
| 434 | { |
| 435 | bitmap_super_t *sb; |
| 436 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 437 | if (!bitmap || !bitmap->storage.sb_page) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 438 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 439 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 440 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 441 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
| 442 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); |
| 443 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 444 | *(__u32 *)(sb->uuid+0), |
| 445 | *(__u32 *)(sb->uuid+4), |
| 446 | *(__u32 *)(sb->uuid+8), |
| 447 | *(__u32 *)(sb->uuid+12)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 448 | printk(KERN_DEBUG " events: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 449 | (unsigned long long) le64_to_cpu(sb->events)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 450 | printk(KERN_DEBUG "events cleared: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 451 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 452 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
| 453 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); |
| 454 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); |
| 455 | printk(KERN_DEBUG " sync size: %llu KB\n", |
| 456 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 457 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 458 | kunmap_atomic(sb); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 459 | } |
| 460 | |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 461 | /* |
| 462 | * bitmap_new_disk_sb |
| 463 | * @bitmap |
| 464 | * |
| 465 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb |
| 466 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. |
| 467 | * This function verifies 'bitmap_info' and populates the on-disk bitmap |
| 468 | * structure, which is to be written to disk. |
| 469 | * |
| 470 | * Returns: 0 on success, -Exxx on error |
| 471 | */ |
| 472 | static int bitmap_new_disk_sb(struct bitmap *bitmap) |
| 473 | { |
| 474 | bitmap_super_t *sb; |
| 475 | unsigned long chunksize, daemon_sleep, write_behind; |
| 476 | int err = -EINVAL; |
| 477 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 478 | bitmap->storage.sb_page = alloc_page(GFP_KERNEL); |
| 479 | if (IS_ERR(bitmap->storage.sb_page)) { |
| 480 | err = PTR_ERR(bitmap->storage.sb_page); |
| 481 | bitmap->storage.sb_page = NULL; |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 482 | return err; |
| 483 | } |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 484 | bitmap->storage.sb_page->index = 0; |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 485 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 486 | sb = kmap_atomic(bitmap->storage.sb_page); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 487 | |
| 488 | sb->magic = cpu_to_le32(BITMAP_MAGIC); |
| 489 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); |
| 490 | |
| 491 | chunksize = bitmap->mddev->bitmap_info.chunksize; |
| 492 | BUG_ON(!chunksize); |
| 493 | if (!is_power_of_2(chunksize)) { |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 494 | kunmap_atomic(sb); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 495 | printk(KERN_ERR "bitmap chunksize not a power of 2\n"); |
| 496 | return -EINVAL; |
| 497 | } |
| 498 | sb->chunksize = cpu_to_le32(chunksize); |
| 499 | |
| 500 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; |
| 501 | if (!daemon_sleep || |
| 502 | (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { |
| 503 | printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n"); |
| 504 | daemon_sleep = 5 * HZ; |
| 505 | } |
| 506 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); |
| 507 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; |
| 508 | |
| 509 | /* |
| 510 | * FIXME: write_behind for RAID1. If not specified, what |
| 511 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. |
| 512 | */ |
| 513 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; |
| 514 | if (write_behind > COUNTER_MAX) |
| 515 | write_behind = COUNTER_MAX / 2; |
| 516 | sb->write_behind = cpu_to_le32(write_behind); |
| 517 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
| 518 | |
| 519 | /* keep the array size field of the bitmap superblock up to date */ |
| 520 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 521 | |
| 522 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); |
| 523 | |
| 524 | bitmap->flags |= BITMAP_STALE; |
NeilBrown | 84e9234 | 2012-05-22 13:55:14 +1000 | [diff] [blame^] | 525 | sb->state = cpu_to_le32(bitmap->flags); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 526 | bitmap->events_cleared = bitmap->mddev->events; |
| 527 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); |
| 528 | |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 529 | kunmap_atomic(sb); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 530 | |
| 531 | return 0; |
| 532 | } |
| 533 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 534 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
| 535 | static int bitmap_read_sb(struct bitmap *bitmap) |
| 536 | { |
| 537 | char *reason = NULL; |
| 538 | bitmap_super_t *sb; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 539 | unsigned long chunksize, daemon_sleep, write_behind; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 540 | unsigned long long events; |
| 541 | int err = -EINVAL; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 542 | struct page *sb_page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 543 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 544 | if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 545 | chunksize = 128 * 1024 * 1024; |
| 546 | daemon_sleep = 5 * HZ; |
| 547 | write_behind = 0; |
| 548 | bitmap->flags = BITMAP_STALE; |
| 549 | err = 0; |
| 550 | goto out_no_sb; |
| 551 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 552 | /* page 0 is the superblock, read it... */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 553 | sb_page = alloc_page(GFP_KERNEL); |
| 554 | if (!sb_page) |
| 555 | return -ENOMEM; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 556 | bitmap->storage.sb_page = sb_page; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 557 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 558 | if (bitmap->storage.file) { |
| 559 | loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 560 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
| 561 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 562 | err = read_page(bitmap->storage.file, 0, |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 563 | bitmap, bytes, sb_page); |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 564 | } else { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 565 | err = read_sb_page(bitmap->mddev, |
| 566 | bitmap->mddev->bitmap_info.offset, |
| 567 | sb_page, |
| 568 | 0, sizeof(bitmap_super_t)); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 569 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 570 | if (err) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 571 | return err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 572 | |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 573 | sb = kmap_atomic(sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 574 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 575 | chunksize = le32_to_cpu(sb->chunksize); |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 576 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 577 | write_behind = le32_to_cpu(sb->write_behind); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 578 | |
| 579 | /* verify that the bitmap-specific fields are valid */ |
| 580 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) |
| 581 | reason = "bad magic"; |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 582 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
| 583 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 584 | reason = "unrecognized superblock version"; |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 585 | else if (chunksize < 512) |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 586 | reason = "bitmap chunksize too small"; |
Jonathan Brassow | d744540 | 2011-06-08 18:01:10 -0500 | [diff] [blame] | 587 | else if (!is_power_of_2(chunksize)) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 588 | reason = "bitmap chunksize not a power of 2"; |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 589 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 590 | reason = "daemon sleep period out of range"; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 591 | else if (write_behind > COUNTER_MAX) |
| 592 | reason = "write-behind limit out of range (0 - 16383)"; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 593 | if (reason) { |
| 594 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", |
| 595 | bmname(bitmap), reason); |
| 596 | goto out; |
| 597 | } |
| 598 | |
| 599 | /* keep the array size field of the bitmap superblock up to date */ |
| 600 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 601 | |
NeilBrown | 278c1ca | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 602 | if (bitmap->mddev->persistent) { |
| 603 | /* |
| 604 | * We have a persistent array superblock, so compare the |
| 605 | * bitmap's UUID and event counter to the mddev's |
| 606 | */ |
| 607 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { |
| 608 | printk(KERN_INFO |
| 609 | "%s: bitmap superblock UUID mismatch\n", |
| 610 | bmname(bitmap)); |
| 611 | goto out; |
| 612 | } |
| 613 | events = le64_to_cpu(sb->events); |
| 614 | if (events < bitmap->mddev->events) { |
| 615 | printk(KERN_INFO |
| 616 | "%s: bitmap file is out of date (%llu < %llu) " |
| 617 | "-- forcing full recovery\n", |
| 618 | bmname(bitmap), events, |
| 619 | (unsigned long long) bitmap->mddev->events); |
NeilBrown | 84e9234 | 2012-05-22 13:55:14 +1000 | [diff] [blame^] | 620 | bitmap->flags |= BITMAP_STALE; |
NeilBrown | 278c1ca | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 621 | } |
| 622 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 623 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 624 | /* assign fields using values from superblock */ |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 625 | bitmap->flags |= le32_to_cpu(sb->state); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 626 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
| 627 | bitmap->flags |= BITMAP_HOSTENDIAN; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 628 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
| 629 | err = 0; |
| 630 | out: |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 631 | kunmap_atomic(sb); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 632 | out_no_sb: |
| 633 | if (bitmap->flags & BITMAP_STALE) |
| 634 | bitmap->events_cleared = bitmap->mddev->events; |
| 635 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
| 636 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; |
| 637 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 638 | if (err) |
| 639 | bitmap_print_sb(bitmap); |
| 640 | return err; |
| 641 | } |
| 642 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 643 | /* |
| 644 | * general bitmap file operations |
| 645 | */ |
| 646 | |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 647 | /* |
| 648 | * on-disk bitmap: |
| 649 | * |
| 650 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap |
| 651 | * file a page at a time. There's a superblock at the start of the file. |
| 652 | */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 653 | /* calculate the index of the page that contains this bit */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 654 | static inline unsigned long file_page_index(struct bitmap_storage *store, |
| 655 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 656 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 657 | if (store->sb_page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 658 | chunk += sizeof(bitmap_super_t) << 3; |
| 659 | return chunk >> PAGE_BIT_SHIFT; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | /* calculate the (bit) offset of this bit within a page */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 663 | static inline unsigned long file_page_offset(struct bitmap_storage *store, |
| 664 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 665 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 666 | if (store->sb_page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 667 | chunk += sizeof(bitmap_super_t) << 3; |
| 668 | return chunk & (PAGE_BITS - 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | /* |
| 672 | * return a pointer to the page in the filemap that contains the given bit |
| 673 | * |
| 674 | * this lookup is complicated by the fact that the bitmap sb might be exactly |
| 675 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page |
| 676 | * 0 or page 1 |
| 677 | */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 678 | static inline struct page *filemap_get_page(struct bitmap_storage *store, |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 679 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 680 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 681 | if (file_page_index(store, chunk) >= store->file_pages) |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 682 | return NULL; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 683 | return store->filemap[file_page_index(store, chunk) |
| 684 | - file_page_index(store, 0)]; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 685 | } |
| 686 | |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 687 | static int bitmap_storage_alloc(struct bitmap_storage *store, |
| 688 | unsigned long chunks, int with_super) |
| 689 | { |
| 690 | int pnum; |
| 691 | unsigned long num_pages; |
| 692 | unsigned long bytes; |
| 693 | |
| 694 | bytes = DIV_ROUND_UP(chunks, 8); |
| 695 | if (with_super) |
| 696 | bytes += sizeof(bitmap_super_t); |
| 697 | |
| 698 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); |
| 699 | |
| 700 | store->filemap = kmalloc(sizeof(struct page *) |
| 701 | * num_pages, GFP_KERNEL); |
| 702 | if (!store->filemap) |
| 703 | return -ENOMEM; |
| 704 | |
| 705 | if (with_super && !store->sb_page) { |
| 706 | store->sb_page = alloc_page(GFP_KERNEL); |
| 707 | if (store->sb_page == NULL) |
| 708 | return -ENOMEM; |
| 709 | store->sb_page->index = 0; |
| 710 | } |
| 711 | pnum = 0; |
| 712 | if (store->sb_page) { |
| 713 | store->filemap[0] = store->sb_page; |
| 714 | pnum = 1; |
| 715 | } |
| 716 | for ( ; pnum < num_pages; pnum++) { |
| 717 | store->filemap[pnum] = alloc_page(GFP_KERNEL); |
| 718 | if (!store->filemap[pnum]) { |
| 719 | store->file_pages = pnum; |
| 720 | return -ENOMEM; |
| 721 | } |
| 722 | store->filemap[pnum]->index = pnum; |
| 723 | } |
| 724 | store->file_pages = pnum; |
| 725 | |
| 726 | /* We need 4 bits per page, rounded up to a multiple |
| 727 | * of sizeof(unsigned long) */ |
| 728 | store->filemap_attr = kzalloc( |
| 729 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
| 730 | GFP_KERNEL); |
| 731 | if (!store->filemap_attr) |
| 732 | return -ENOMEM; |
| 733 | |
| 734 | store->bytes = bytes; |
| 735 | |
| 736 | return 0; |
| 737 | } |
| 738 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 739 | static void bitmap_file_unmap(struct bitmap *bitmap) |
| 740 | { |
| 741 | struct page **map, *sb_page; |
| 742 | unsigned long *attr; |
| 743 | int pages; |
| 744 | unsigned long flags; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 745 | struct bitmap_storage *store = &bitmap->storage; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 746 | |
| 747 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 748 | map = store->filemap; |
| 749 | store->filemap = NULL; |
| 750 | attr = store->filemap_attr; |
| 751 | store->filemap_attr = NULL; |
| 752 | pages = store->file_pages; |
| 753 | store->file_pages = 0; |
| 754 | sb_page = store->sb_page; |
| 755 | store->sb_page = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 756 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 757 | |
| 758 | while (pages--) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 759 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 760 | free_buffers(map[pages]); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 761 | kfree(map); |
| 762 | kfree(attr); |
| 763 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 764 | if (sb_page) |
| 765 | free_buffers(sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | static void bitmap_file_put(struct bitmap *bitmap) |
| 769 | { |
| 770 | struct file *file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 771 | unsigned long flags; |
| 772 | |
| 773 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 774 | file = bitmap->storage.file; |
| 775 | bitmap->storage.file = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 776 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 777 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 778 | if (file) |
| 779 | wait_event(bitmap->write_wait, |
| 780 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 781 | bitmap_file_unmap(bitmap); |
| 782 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 783 | if (file) { |
Josef Sipek | c649bb9 | 2006-12-08 02:37:19 -0800 | [diff] [blame] | 784 | struct inode *inode = file->f_path.dentry->d_inode; |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 785 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 786 | fput(file); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 787 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 788 | } |
| 789 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 790 | /* |
| 791 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file |
| 792 | * then it is no longer reliable, so we stop using it and we mark the file |
| 793 | * as failed in the superblock |
| 794 | */ |
| 795 | static void bitmap_file_kick(struct bitmap *bitmap) |
| 796 | { |
| 797 | char *path, *ptr = NULL; |
| 798 | |
NeilBrown | edbb79d | 2012-05-22 13:55:13 +1000 | [diff] [blame] | 799 | if (!(bitmap->flags & BITMAP_STALE)) { |
| 800 | bitmap->flags |= BITMAP_STALE; |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 801 | bitmap_update_sb(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 802 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 803 | if (bitmap->storage.file) { |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 804 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 805 | if (path) |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 806 | ptr = d_path(&bitmap->storage.file->f_path, |
| 807 | path, PAGE_SIZE); |
Christoph Hellwig | 6bcfd60 | 2008-05-23 13:04:34 -0700 | [diff] [blame] | 808 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 809 | printk(KERN_ALERT |
| 810 | "%s: kicking failed bitmap file %s from array!\n", |
Christoph Hellwig | 6bcfd60 | 2008-05-23 13:04:34 -0700 | [diff] [blame] | 811 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 812 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 813 | kfree(path); |
| 814 | } else |
| 815 | printk(KERN_ALERT |
| 816 | "%s: disabling internal bitmap due to errors\n", |
| 817 | bmname(bitmap)); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 818 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 819 | |
| 820 | bitmap_file_put(bitmap); |
| 821 | |
| 822 | return; |
| 823 | } |
| 824 | |
| 825 | enum bitmap_page_attr { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 826 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
NeilBrown | 5a537df | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 827 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
| 828 | * i.e. counter is 1 or 2. */ |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 829 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 830 | }; |
| 831 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 832 | static inline void set_page_attr(struct bitmap *bitmap, int pnum, |
| 833 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 834 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 835 | __set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 836 | } |
| 837 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 838 | static inline void clear_page_attr(struct bitmap *bitmap, int pnum, |
| 839 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 840 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 841 | __clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 842 | } |
| 843 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 844 | static inline unsigned long test_page_attr(struct bitmap *bitmap, int pnum, |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 845 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 846 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 847 | return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 848 | } |
| 849 | |
| 850 | /* |
| 851 | * bitmap_file_set_bit -- called before performing a write to the md device |
| 852 | * to set (and eventually sync) a particular bit in the bitmap file |
| 853 | * |
| 854 | * we set the bit immediately, then we record the page number so that |
| 855 | * when an unplug occurs, we can flush the dirty pages out to disk |
| 856 | */ |
| 857 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) |
| 858 | { |
| 859 | unsigned long bit; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 860 | struct page *page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 861 | void *kaddr; |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 862 | unsigned long chunk = block >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 863 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 864 | page = filemap_get_page(&bitmap->storage, chunk); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 865 | if (!page) |
| 866 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 867 | bit = file_page_offset(&bitmap->storage, chunk); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 868 | |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 869 | /* set the bit */ |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 870 | kaddr = kmap_atomic(page); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 871 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
| 872 | set_bit(bit, kaddr); |
| 873 | else |
| 874 | __set_bit_le(bit, kaddr); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 875 | kunmap_atomic(kaddr); |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 876 | pr_debug("set file bit %lu page %lu\n", bit, page->index); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 877 | /* record page number so it gets flushed to disk when unplug occurs */ |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 878 | set_page_attr(bitmap, page->index, BITMAP_PAGE_DIRTY); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 879 | } |
| 880 | |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 881 | static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) |
| 882 | { |
| 883 | unsigned long bit; |
| 884 | struct page *page; |
| 885 | void *paddr; |
| 886 | unsigned long chunk = block >> bitmap->chunkshift; |
| 887 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 888 | page = filemap_get_page(&bitmap->storage, chunk); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 889 | if (!page) |
| 890 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 891 | bit = file_page_offset(&bitmap->storage, chunk); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 892 | paddr = kmap_atomic(page); |
| 893 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
| 894 | clear_bit(bit, paddr); |
| 895 | else |
| 896 | __clear_bit_le(bit, paddr); |
| 897 | kunmap_atomic(paddr); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 898 | if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) { |
| 899 | set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 900 | bitmap->allclean = 0; |
| 901 | } |
| 902 | } |
| 903 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 904 | /* this gets called when the md device is ready to unplug its underlying |
| 905 | * (slave) device queues -- before we let any writes go down, we need to |
| 906 | * sync the dirty pages of the bitmap file to disk */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 907 | void bitmap_unplug(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 908 | { |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 909 | unsigned long i, flags; |
| 910 | int dirty, need_write; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 911 | int wait = 0; |
| 912 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 913 | if (!bitmap || !bitmap->storage.filemap) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 914 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 915 | |
| 916 | /* look at each page to see if there are any set bits that need to be |
| 917 | * flushed out to disk */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 918 | for (i = 0; i < bitmap->storage.file_pages; i++) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 919 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 920 | if (!bitmap->storage.filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 921 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 922 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 923 | } |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 924 | dirty = test_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
| 925 | need_write = test_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); |
| 926 | clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
| 927 | clear_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 928 | if (dirty || need_write) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 929 | clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 930 | if (dirty) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 931 | wait = 1; |
| 932 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 933 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 934 | if (dirty || need_write) |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 935 | write_page(bitmap, bitmap->storage.filemap[i], 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 936 | } |
| 937 | if (wait) { /* if any writes were performed, we need to wait on them */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 938 | if (bitmap->storage.file) |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 939 | wait_event(bitmap->write_wait, |
| 940 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 0b79ccf | 2006-06-26 00:27:44 -0700 | [diff] [blame] | 941 | else |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 942 | md_super_wait(bitmap->mddev); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 943 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 944 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 945 | bitmap_file_kick(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 946 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 947 | EXPORT_SYMBOL(bitmap_unplug); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 948 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 949 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 950 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
| 951 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the |
| 952 | * memory mapping of the bitmap file |
| 953 | * Special cases: |
| 954 | * if there's no bitmap file, or if the bitmap file had been |
| 955 | * previously kicked from the array, we mark all the bits as |
| 956 | * 1's in order to cause a full resync. |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 957 | * |
| 958 | * We ignore all bits for sectors that end earlier than 'start'. |
| 959 | * This is used when reading an out-of-date bitmap... |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 960 | */ |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 961 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 962 | { |
| 963 | unsigned long i, chunks, index, oldindex, bit; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 964 | struct page *page = NULL; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 965 | unsigned long bit_cnt = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 966 | struct file *file; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 967 | unsigned long offset; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 968 | int outofdate; |
| 969 | int ret = -ENOSPC; |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 970 | void *paddr; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 971 | struct bitmap_storage *store = &bitmap->storage; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 972 | |
| 973 | chunks = bitmap->chunks; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 974 | file = store->file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 975 | |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 976 | if (!file && !bitmap->mddev->bitmap_info.offset) { |
| 977 | /* No permanent bitmap - fill with '1s'. */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 978 | store->filemap = NULL; |
| 979 | store->file_pages = 0; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 980 | for (i = 0; i < chunks ; i++) { |
| 981 | /* if the disk bit is set, set the memory bit */ |
| 982 | int needed = ((sector_t)(i+1) << (bitmap->chunkshift) |
| 983 | >= start); |
| 984 | bitmap_set_memory_bits(bitmap, |
| 985 | (sector_t)i << bitmap->chunkshift, |
| 986 | needed); |
| 987 | } |
| 988 | return 0; |
| 989 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 990 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 991 | outofdate = bitmap->flags & BITMAP_STALE; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 992 | if (outofdate) |
| 993 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " |
| 994 | "recovery\n", bmname(bitmap)); |
| 995 | |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 996 | if (file && i_size_read(file->f_mapping->host) < store->bytes) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 997 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 998 | bmname(bitmap), |
| 999 | (unsigned long) i_size_read(file->f_mapping->host), |
| 1000 | store->bytes); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1001 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1002 | } |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 1003 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1004 | oldindex = ~0L; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1005 | offset = 0; |
| 1006 | if (!bitmap->mddev->bitmap_info.external) |
| 1007 | offset = sizeof(bitmap_super_t); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1008 | |
| 1009 | for (i = 0; i < chunks; i++) { |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1010 | int b; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1011 | index = file_page_index(&bitmap->storage, i); |
| 1012 | bit = file_page_offset(&bitmap->storage, i); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1013 | if (index != oldindex) { /* this is a new page, read it in */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 1014 | int count; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1015 | /* unmap the old page, we're done with it */ |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1016 | if (index == store->file_pages-1) |
| 1017 | count = store->bytes - index * PAGE_SIZE; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 1018 | else |
| 1019 | count = PAGE_SIZE; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1020 | page = store->filemap[index]; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1021 | if (file) |
| 1022 | ret = read_page(file, index, bitmap, |
| 1023 | count, page); |
| 1024 | else |
| 1025 | ret = read_sb_page( |
| 1026 | bitmap->mddev, |
| 1027 | bitmap->mddev->bitmap_info.offset, |
| 1028 | page, |
| 1029 | index, count); |
| 1030 | |
| 1031 | if (ret) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1032 | goto err; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1033 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1034 | oldindex = index; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1035 | |
| 1036 | if (outofdate) { |
| 1037 | /* |
| 1038 | * if bitmap is out of date, dirty the |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1039 | * whole page and write it out |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1040 | */ |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1041 | paddr = kmap_atomic(page); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1042 | memset(paddr + offset, 0xff, |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1043 | PAGE_SIZE - offset); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1044 | kunmap_atomic(paddr); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1045 | write_page(bitmap, page, 1); |
| 1046 | |
| 1047 | ret = -EIO; |
NeilBrown | b74fd28 | 2009-05-07 12:47:19 +1000 | [diff] [blame] | 1048 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1049 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1050 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1051 | } |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1052 | paddr = kmap_atomic(page); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1053 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1054 | b = test_bit(bit, paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1055 | else |
Akinobu Mita | 6b33aff | 2011-03-23 16:42:13 -0700 | [diff] [blame] | 1056 | b = test_bit_le(bit, paddr); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1057 | kunmap_atomic(paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1058 | if (b) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1059 | /* if the disk bit is set, set the memory bit */ |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1060 | int needed = ((sector_t)(i+1) << bitmap->chunkshift |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1061 | >= start); |
| 1062 | bitmap_set_memory_bits(bitmap, |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1063 | (sector_t)i << bitmap->chunkshift, |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1064 | needed); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1065 | bit_cnt++; |
| 1066 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1067 | offset = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1068 | } |
| 1069 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1070 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1071 | "read %lu pages, set %lu of %lu bits\n", |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1072 | bmname(bitmap), store->file_pages, |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1073 | bit_cnt, chunks); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1074 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1075 | return 0; |
| 1076 | |
| 1077 | err: |
| 1078 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", |
| 1079 | bmname(bitmap), ret); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1080 | return ret; |
| 1081 | } |
| 1082 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1083 | void bitmap_write_all(struct bitmap *bitmap) |
| 1084 | { |
| 1085 | /* We don't actually write all bitmap blocks here, |
| 1086 | * just flag them as needing to be written |
| 1087 | */ |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1088 | int i; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1089 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1090 | if (!bitmap || !bitmap->storage.filemap) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1091 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1092 | if (bitmap->storage.file) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1093 | /* Only one copy, so nothing needed */ |
| 1094 | return; |
| 1095 | |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1096 | spin_lock_irq(&bitmap->lock); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1097 | for (i = 0; i < bitmap->storage.file_pages; i++) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1098 | set_page_attr(bitmap, i, |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1099 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1100 | bitmap->allclean = 0; |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1101 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1102 | } |
| 1103 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1104 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
| 1105 | { |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1106 | sector_t chunk = offset >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1107 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1108 | bitmap->bp[page].count += inc; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1109 | bitmap_checkfree(bitmap, page); |
| 1110 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1111 | |
| 1112 | static void bitmap_set_pending(struct bitmap *bitmap, sector_t offset) |
| 1113 | { |
| 1114 | sector_t chunk = offset >> bitmap->chunkshift; |
| 1115 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1116 | struct bitmap_page *bp = &bitmap->bp[page]; |
| 1117 | |
| 1118 | if (!bp->pending) |
| 1119 | bp->pending = 1; |
| 1120 | } |
| 1121 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1122 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1123 | sector_t offset, sector_t *blocks, |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1124 | int create); |
| 1125 | |
| 1126 | /* |
| 1127 | * bitmap daemon -- periodically wakes up to clean bits and flush pages |
| 1128 | * out to disk |
| 1129 | */ |
| 1130 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1131 | void bitmap_daemon_work(struct mddev *mddev) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1132 | { |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1133 | struct bitmap *bitmap; |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1134 | unsigned long j; |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1135 | unsigned long nextpage; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1136 | unsigned long flags; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1137 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1138 | |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1139 | /* Use a mutex to guard daemon_work against |
| 1140 | * bitmap_destroy. |
| 1141 | */ |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1142 | mutex_lock(&mddev->bitmap_info.mutex); |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1143 | bitmap = mddev->bitmap; |
| 1144 | if (bitmap == NULL) { |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1145 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1146 | return; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1147 | } |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1148 | if (time_before(jiffies, bitmap->daemon_lastrun |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1149 | + mddev->bitmap_info.daemon_sleep)) |
NeilBrown | 7be3dfe | 2008-03-10 11:43:48 -0700 | [diff] [blame] | 1150 | goto done; |
| 1151 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1152 | bitmap->daemon_lastrun = jiffies; |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1153 | if (bitmap->allclean) { |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1154 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1155 | goto done; |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1156 | } |
| 1157 | bitmap->allclean = 1; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1158 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1159 | /* Any file-page which is PENDING now needs to be written. |
| 1160 | * So set NEEDWRITE now, then after we make any last-minute changes |
| 1161 | * we will write it. |
| 1162 | */ |
NeilBrown | be51269 | 2009-05-26 09:41:17 +1000 | [diff] [blame] | 1163 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1164 | for (j = 0; j < bitmap->storage.file_pages; j++) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1165 | if (test_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1166 | BITMAP_PAGE_PENDING)) { |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1167 | set_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1168 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1169 | clear_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1170 | BITMAP_PAGE_PENDING); |
| 1171 | } |
| 1172 | |
| 1173 | if (bitmap->need_sync && |
| 1174 | mddev->bitmap_info.external == 0) { |
| 1175 | /* Arrange for superblock update as well as |
| 1176 | * other changes */ |
| 1177 | bitmap_super_t *sb; |
| 1178 | bitmap->need_sync = 0; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1179 | if (bitmap->storage.filemap) { |
| 1180 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1181 | sb->events_cleared = |
| 1182 | cpu_to_le64(bitmap->events_cleared); |
| 1183 | kunmap_atomic(sb); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1184 | set_page_attr(bitmap, 0, |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1185 | BITMAP_PAGE_NEEDWRITE); |
| 1186 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1187 | } |
| 1188 | /* Now look at the bitmap counters and if any are '2' or '1', |
| 1189 | * decrement and handle accordingly. |
| 1190 | */ |
| 1191 | nextpage = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1192 | for (j = 0; j < bitmap->chunks; j++) { |
| 1193 | bitmap_counter_t *bmc; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1194 | sector_t block = (sector_t)j << bitmap->chunkshift; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1195 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1196 | if (j == nextpage) { |
| 1197 | nextpage += PAGE_COUNTER_RATIO; |
| 1198 | if (!bitmap->bp[j >> PAGE_COUNTER_SHIFT].pending) { |
| 1199 | j |= PAGE_COUNTER_MASK; |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1200 | continue; |
| 1201 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1202 | bitmap->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1203 | } |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1204 | bmc = bitmap_get_counter(bitmap, |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1205 | block, |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1206 | &blocks, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1207 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1208 | if (!bmc) { |
| 1209 | j |= PAGE_COUNTER_MASK; |
| 1210 | continue; |
| 1211 | } |
| 1212 | if (*bmc == 1 && !bitmap->need_sync) { |
| 1213 | /* We can clear the bit */ |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1214 | *bmc = 0; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1215 | bitmap_count_page(bitmap, block, -1); |
| 1216 | bitmap_file_clear_bit(bitmap, block); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1217 | } else if (*bmc && *bmc <= 2) { |
| 1218 | *bmc = 1; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1219 | bitmap_set_pending(bitmap, block); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1220 | bitmap->allclean = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1221 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1222 | } |
| 1223 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1224 | /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. |
| 1225 | * DIRTY pages need to be written by bitmap_unplug so it can wait |
| 1226 | * for them. |
| 1227 | * If we find any DIRTY page we stop there and let bitmap_unplug |
| 1228 | * handle all the rest. This is important in the case where |
| 1229 | * the first blocking holds the superblock and it has been updated. |
| 1230 | * We mustn't write any other blocks before the superblock. |
| 1231 | */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1232 | for (j = 0; j < bitmap->storage.file_pages; j++) { |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1233 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1234 | if (test_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1235 | BITMAP_PAGE_DIRTY)) |
| 1236 | /* bitmap_unplug will handle the rest */ |
| 1237 | break; |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1238 | if (test_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1239 | BITMAP_PAGE_NEEDWRITE)) { |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1240 | clear_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1241 | BITMAP_PAGE_NEEDWRITE); |
| 1242 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1243 | write_page(bitmap, bitmap->storage.filemap[j], 0); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1244 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1245 | if (!bitmap->storage.filemap) |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1246 | break; |
| 1247 | } |
| 1248 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1249 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1250 | |
NeilBrown | 7be3dfe | 2008-03-10 11:43:48 -0700 | [diff] [blame] | 1251 | done: |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1252 | if (bitmap->allclean == 0) |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1253 | mddev->thread->timeout = |
| 1254 | mddev->bitmap_info.daemon_sleep; |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1255 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1256 | } |
| 1257 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1258 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1259 | sector_t offset, sector_t *blocks, |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1260 | int create) |
NeilBrown | ee305ac | 2009-09-23 18:06:44 +1000 | [diff] [blame] | 1261 | __releases(bitmap->lock) |
| 1262 | __acquires(bitmap->lock) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1263 | { |
| 1264 | /* If 'create', we might release the lock and reclaim it. |
| 1265 | * The lock must have been taken with interrupts enabled. |
| 1266 | * If !create, we don't release the lock. |
| 1267 | */ |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1268 | sector_t chunk = offset >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1269 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1270 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; |
| 1271 | sector_t csize; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1272 | int err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1273 | |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1274 | err = bitmap_checkpage(bitmap, page, create); |
| 1275 | |
| 1276 | if (bitmap->bp[page].hijacked || |
| 1277 | bitmap->bp[page].map == NULL) |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1278 | csize = ((sector_t)1) << (bitmap->chunkshift + |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1279 | PAGE_COUNTER_SHIFT - 1); |
| 1280 | else |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1281 | csize = ((sector_t)1) << bitmap->chunkshift; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1282 | *blocks = csize - (offset & (csize - 1)); |
| 1283 | |
| 1284 | if (err < 0) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1285 | return NULL; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1286 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1287 | /* now locked ... */ |
| 1288 | |
| 1289 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ |
| 1290 | /* should we use the first or second counter field |
| 1291 | * of the hijacked pointer? */ |
| 1292 | int hi = (pageoff > PAGE_COUNTER_MASK); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1293 | return &((bitmap_counter_t *) |
| 1294 | &bitmap->bp[page].map)[hi]; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1295 | } else /* page is allocated */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1296 | return (bitmap_counter_t *) |
| 1297 | &(bitmap->bp[page].map[pageoff]); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1298 | } |
| 1299 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1300 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1301 | { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1302 | if (!bitmap) |
| 1303 | return 0; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1304 | |
| 1305 | if (behind) { |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 1306 | int bw; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1307 | atomic_inc(&bitmap->behind_writes); |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 1308 | bw = atomic_read(&bitmap->behind_writes); |
| 1309 | if (bw > bitmap->behind_writes_used) |
| 1310 | bitmap->behind_writes_used = bw; |
| 1311 | |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 1312 | pr_debug("inc write-behind count %d/%lu\n", |
| 1313 | bw, bitmap->mddev->bitmap_info.max_write_behind); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1314 | } |
| 1315 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1316 | while (sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1317 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1318 | bitmap_counter_t *bmc; |
| 1319 | |
| 1320 | spin_lock_irq(&bitmap->lock); |
| 1321 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); |
| 1322 | if (!bmc) { |
| 1323 | spin_unlock_irq(&bitmap->lock); |
| 1324 | return 0; |
| 1325 | } |
| 1326 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1327 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1328 | DEFINE_WAIT(__wait); |
| 1329 | /* note that it is safe to do the prepare_to_wait |
| 1330 | * after the test as long as we do it before dropping |
| 1331 | * the spinlock. |
| 1332 | */ |
| 1333 | prepare_to_wait(&bitmap->overflow_wait, &__wait, |
| 1334 | TASK_UNINTERRUPTIBLE); |
| 1335 | spin_unlock_irq(&bitmap->lock); |
Jens Axboe | 7eaceac | 2011-03-10 08:52:07 +0100 | [diff] [blame] | 1336 | io_schedule(); |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1337 | finish_wait(&bitmap->overflow_wait, &__wait); |
| 1338 | continue; |
| 1339 | } |
| 1340 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1341 | switch (*bmc) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1342 | case 0: |
| 1343 | bitmap_file_set_bit(bitmap, offset); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1344 | bitmap_count_page(bitmap, offset, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1345 | /* fall through */ |
| 1346 | case 1: |
| 1347 | *bmc = 2; |
| 1348 | } |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1349 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1350 | (*bmc)++; |
| 1351 | |
| 1352 | spin_unlock_irq(&bitmap->lock); |
| 1353 | |
| 1354 | offset += blocks; |
| 1355 | if (sectors > blocks) |
| 1356 | sectors -= blocks; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1357 | else |
| 1358 | sectors = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1359 | } |
| 1360 | return 0; |
| 1361 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1362 | EXPORT_SYMBOL(bitmap_startwrite); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1363 | |
| 1364 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1365 | int success, int behind) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1366 | { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1367 | if (!bitmap) |
| 1368 | return; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1369 | if (behind) { |
NeilBrown | e555190 | 2010-03-31 11:21:44 +1100 | [diff] [blame] | 1370 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
| 1371 | wake_up(&bitmap->behind_wait); |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 1372 | pr_debug("dec write-behind count %d/%lu\n", |
| 1373 | atomic_read(&bitmap->behind_writes), |
| 1374 | bitmap->mddev->bitmap_info.max_write_behind); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1375 | } |
| 1376 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1377 | while (sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1378 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1379 | unsigned long flags; |
| 1380 | bitmap_counter_t *bmc; |
| 1381 | |
| 1382 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1383 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); |
| 1384 | if (!bmc) { |
| 1385 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1386 | return; |
| 1387 | } |
| 1388 | |
NeilBrown | 961902c | 2011-12-23 09:57:48 +1100 | [diff] [blame] | 1389 | if (success && !bitmap->mddev->degraded && |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 1390 | bitmap->events_cleared < bitmap->mddev->events) { |
| 1391 | bitmap->events_cleared = bitmap->mddev->events; |
| 1392 | bitmap->need_sync = 1; |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1393 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 1394 | } |
| 1395 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1396 | if (!success && !NEEDED(*bmc)) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1397 | *bmc |= NEEDED_MASK; |
| 1398 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1399 | if (COUNTER(*bmc) == COUNTER_MAX) |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1400 | wake_up(&bitmap->overflow_wait); |
| 1401 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1402 | (*bmc)--; |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1403 | if (*bmc <= 2) { |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1404 | bitmap_set_pending(bitmap, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1405 | bitmap->allclean = 0; |
| 1406 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1407 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1408 | offset += blocks; |
| 1409 | if (sectors > blocks) |
| 1410 | sectors -= blocks; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1411 | else |
| 1412 | sectors = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1413 | } |
| 1414 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1415 | EXPORT_SYMBOL(bitmap_endwrite); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1416 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1417 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1418 | int degraded) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1419 | { |
| 1420 | bitmap_counter_t *bmc; |
| 1421 | int rv; |
| 1422 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ |
| 1423 | *blocks = 1024; |
| 1424 | return 1; /* always resync if no bitmap */ |
| 1425 | } |
| 1426 | spin_lock_irq(&bitmap->lock); |
| 1427 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1428 | rv = 0; |
| 1429 | if (bmc) { |
| 1430 | /* locked */ |
| 1431 | if (RESYNC(*bmc)) |
| 1432 | rv = 1; |
| 1433 | else if (NEEDED(*bmc)) { |
| 1434 | rv = 1; |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1435 | if (!degraded) { /* don't set/clear bits if degraded */ |
| 1436 | *bmc |= RESYNC_MASK; |
| 1437 | *bmc &= ~NEEDED_MASK; |
| 1438 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1439 | } |
| 1440 | } |
| 1441 | spin_unlock_irq(&bitmap->lock); |
| 1442 | return rv; |
| 1443 | } |
| 1444 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1445 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1446 | int degraded) |
| 1447 | { |
| 1448 | /* bitmap_start_sync must always report on multiples of whole |
| 1449 | * pages, otherwise resync (which is very PAGE_SIZE based) will |
| 1450 | * get confused. |
| 1451 | * So call __bitmap_start_sync repeatedly (if needed) until |
| 1452 | * At least PAGE_SIZE>>9 blocks are covered. |
| 1453 | * Return the 'or' of the result. |
| 1454 | */ |
| 1455 | int rv = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1456 | sector_t blocks1; |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1457 | |
| 1458 | *blocks = 0; |
| 1459 | while (*blocks < (PAGE_SIZE>>9)) { |
| 1460 | rv |= __bitmap_start_sync(bitmap, offset, |
| 1461 | &blocks1, degraded); |
| 1462 | offset += blocks1; |
| 1463 | *blocks += blocks1; |
| 1464 | } |
| 1465 | return rv; |
| 1466 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1467 | EXPORT_SYMBOL(bitmap_start_sync); |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1468 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1469 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1470 | { |
| 1471 | bitmap_counter_t *bmc; |
| 1472 | unsigned long flags; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1473 | |
| 1474 | if (bitmap == NULL) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1475 | *blocks = 1024; |
| 1476 | return; |
| 1477 | } |
| 1478 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1479 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1480 | if (bmc == NULL) |
| 1481 | goto unlock; |
| 1482 | /* locked */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1483 | if (RESYNC(*bmc)) { |
| 1484 | *bmc &= ~RESYNC_MASK; |
| 1485 | |
| 1486 | if (!NEEDED(*bmc) && aborted) |
| 1487 | *bmc |= NEEDED_MASK; |
| 1488 | else { |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1489 | if (*bmc <= 2) { |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1490 | bitmap_set_pending(bitmap, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1491 | bitmap->allclean = 0; |
| 1492 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1493 | } |
| 1494 | } |
| 1495 | unlock: |
| 1496 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1497 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1498 | EXPORT_SYMBOL(bitmap_end_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1499 | |
| 1500 | void bitmap_close_sync(struct bitmap *bitmap) |
| 1501 | { |
| 1502 | /* Sync has finished, and any bitmap chunks that weren't synced |
| 1503 | * properly have been aborted. It remains to us to clear the |
| 1504 | * RESYNC bit wherever it is still on |
| 1505 | */ |
| 1506 | sector_t sector = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1507 | sector_t blocks; |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1508 | if (!bitmap) |
| 1509 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1510 | while (sector < bitmap->mddev->resync_max_sectors) { |
| 1511 | bitmap_end_sync(bitmap, sector, &blocks, 0); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1512 | sector += blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1513 | } |
| 1514 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1515 | EXPORT_SYMBOL(bitmap_close_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1516 | |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1517 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) |
| 1518 | { |
| 1519 | sector_t s = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1520 | sector_t blocks; |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1521 | |
| 1522 | if (!bitmap) |
| 1523 | return; |
| 1524 | if (sector == 0) { |
| 1525 | bitmap->last_end_sync = jiffies; |
| 1526 | return; |
| 1527 | } |
| 1528 | if (time_before(jiffies, (bitmap->last_end_sync |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1529 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1530 | return; |
| 1531 | wait_event(bitmap->mddev->recovery_wait, |
| 1532 | atomic_read(&bitmap->mddev->recovery_active) == 0); |
| 1533 | |
NeilBrown | 75d3da4 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 1534 | bitmap->mddev->curr_resync_completed = sector; |
NeilBrown | 070dc6d | 2010-08-30 17:33:34 +1000 | [diff] [blame] | 1535 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1536 | sector &= ~((1ULL << bitmap->chunkshift) - 1); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1537 | s = 0; |
| 1538 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { |
| 1539 | bitmap_end_sync(bitmap, s, &blocks, 0); |
| 1540 | s += blocks; |
| 1541 | } |
| 1542 | bitmap->last_end_sync = jiffies; |
NeilBrown | acb180b | 2009-04-14 16:28:34 +1000 | [diff] [blame] | 1543 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1544 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1545 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1546 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1547 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1548 | { |
| 1549 | /* For each chunk covered by any of these sectors, set the |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1550 | * counter to 2 and possibly set resync_needed. They should all |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1551 | * be 0 at this point |
| 1552 | */ |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1553 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1554 | sector_t secs; |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1555 | bitmap_counter_t *bmc; |
| 1556 | spin_lock_irq(&bitmap->lock); |
| 1557 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); |
| 1558 | if (!bmc) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1559 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1560 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1561 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1562 | if (!*bmc) { |
NeilBrown | 915c420 | 2011-12-23 10:17:51 +1100 | [diff] [blame] | 1563 | *bmc = 2 | (needed ? NEEDED_MASK : 0); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1564 | bitmap_count_page(bitmap, offset, 1); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1565 | bitmap_set_pending(bitmap, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1566 | bitmap->allclean = 0; |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1567 | } |
| 1568 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1569 | } |
| 1570 | |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1571 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
| 1572 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) |
| 1573 | { |
| 1574 | unsigned long chunk; |
| 1575 | |
| 1576 | for (chunk = s; chunk <= e; chunk++) { |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1577 | sector_t sec = (sector_t)chunk << bitmap->chunkshift; |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1578 | bitmap_set_memory_bits(bitmap, sec, 1); |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1579 | spin_lock_irq(&bitmap->lock); |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1580 | bitmap_file_set_bit(bitmap, sec); |
NeilBrown | 7c8f424 | 2011-11-23 10:18:52 +1100 | [diff] [blame] | 1581 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | ffa2332 | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1582 | if (sec < bitmap->mddev->recovery_cp) |
| 1583 | /* We are asserting that the array is dirty, |
| 1584 | * so move the recovery_cp address back so |
| 1585 | * that it is obvious that it is dirty |
| 1586 | */ |
| 1587 | bitmap->mddev->recovery_cp = sec; |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1588 | } |
| 1589 | } |
| 1590 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1591 | /* |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1592 | * flush out any pending updates |
| 1593 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1594 | void bitmap_flush(struct mddev *mddev) |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1595 | { |
| 1596 | struct bitmap *bitmap = mddev->bitmap; |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1597 | long sleep; |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1598 | |
| 1599 | if (!bitmap) /* there was no bitmap */ |
| 1600 | return; |
| 1601 | |
| 1602 | /* run the daemon_work three time to ensure everything is flushed |
| 1603 | * that can be |
| 1604 | */ |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1605 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1606 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1607 | bitmap_daemon_work(mddev); |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1608 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1609 | bitmap_daemon_work(mddev); |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1610 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1611 | bitmap_daemon_work(mddev); |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1612 | bitmap_update_sb(bitmap); |
| 1613 | } |
| 1614 | |
| 1615 | /* |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1616 | * free memory that was allocated |
| 1617 | */ |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1618 | static void bitmap_free(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1619 | { |
| 1620 | unsigned long k, pages; |
| 1621 | struct bitmap_page *bp; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1622 | |
| 1623 | if (!bitmap) /* there was no bitmap */ |
| 1624 | return; |
| 1625 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1626 | /* release the bitmap file and kill the daemon */ |
| 1627 | bitmap_file_put(bitmap); |
| 1628 | |
| 1629 | bp = bitmap->bp; |
| 1630 | pages = bitmap->pages; |
| 1631 | |
| 1632 | /* free all allocated memory */ |
| 1633 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1634 | if (bp) /* deallocate the page memory */ |
| 1635 | for (k = 0; k < pages; k++) |
| 1636 | if (bp[k].map && !bp[k].hijacked) |
| 1637 | kfree(bp[k].map); |
| 1638 | kfree(bp); |
| 1639 | kfree(bitmap); |
| 1640 | } |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1641 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1642 | void bitmap_destroy(struct mddev *mddev) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1643 | { |
| 1644 | struct bitmap *bitmap = mddev->bitmap; |
| 1645 | |
| 1646 | if (!bitmap) /* there was no bitmap */ |
| 1647 | return; |
| 1648 | |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1649 | mutex_lock(&mddev->bitmap_info.mutex); |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1650 | mddev->bitmap = NULL; /* disconnect from the md device */ |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1651 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1652 | if (mddev->thread) |
| 1653 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1654 | |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1655 | if (bitmap->sysfs_can_clear) |
| 1656 | sysfs_put(bitmap->sysfs_can_clear); |
| 1657 | |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1658 | bitmap_free(bitmap); |
| 1659 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1660 | |
| 1661 | /* |
| 1662 | * initialize the bitmap structure |
| 1663 | * if this returns an error, bitmap_destroy must be called to do clean up |
| 1664 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1665 | int bitmap_create(struct mddev *mddev) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1666 | { |
| 1667 | struct bitmap *bitmap; |
NeilBrown | 1f59390 | 2009-04-20 11:50:24 +1000 | [diff] [blame] | 1668 | sector_t blocks = mddev->resync_max_sectors; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1669 | unsigned long chunks; |
| 1670 | unsigned long pages; |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1671 | struct file *file = mddev->bitmap_info.file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1672 | int err; |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1673 | struct sysfs_dirent *bm = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1674 | |
Alexey Dobriyan | 5f6e3c83 | 2006-10-11 01:22:26 -0700 | [diff] [blame] | 1675 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1676 | |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1677 | BUG_ON(file && mddev->bitmap_info.offset); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1678 | |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1679 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1680 | if (!bitmap) |
| 1681 | return -ENOMEM; |
| 1682 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1683 | spin_lock_init(&bitmap->lock); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1684 | atomic_set(&bitmap->pending_writes, 0); |
| 1685 | init_waitqueue_head(&bitmap->write_wait); |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1686 | init_waitqueue_head(&bitmap->overflow_wait); |
NeilBrown | e555190 | 2010-03-31 11:21:44 +1100 | [diff] [blame] | 1687 | init_waitqueue_head(&bitmap->behind_wait); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1688 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1689 | bitmap->mddev = mddev; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1690 | |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1691 | if (mddev->kobj.sd) |
| 1692 | bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap"); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1693 | if (bm) { |
Eric W. Biederman | 3ff195b | 2010-03-30 11:31:26 -0700 | [diff] [blame] | 1694 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear"); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1695 | sysfs_put(bm); |
| 1696 | } else |
| 1697 | bitmap->sysfs_can_clear = NULL; |
| 1698 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1699 | bitmap->storage.file = file; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1700 | if (file) { |
| 1701 | get_file(file); |
NeilBrown | ae8fa28 | 2009-10-16 15:56:01 +1100 | [diff] [blame] | 1702 | /* As future accesses to this file will use bmap, |
| 1703 | * and bypass the page cache, we must sync the file |
| 1704 | * first. |
| 1705 | */ |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 1706 | vfs_fsync(file, 1); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1707 | } |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1708 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 1709 | if (!mddev->bitmap_info.external) { |
| 1710 | /* |
| 1711 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is |
| 1712 | * instructing us to create a new on-disk bitmap instance. |
| 1713 | */ |
| 1714 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) |
| 1715 | err = bitmap_new_disk_sb(bitmap); |
| 1716 | else |
| 1717 | err = bitmap_read_sb(bitmap); |
| 1718 | } else { |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1719 | err = 0; |
| 1720 | if (mddev->bitmap_info.chunksize == 0 || |
| 1721 | mddev->bitmap_info.daemon_sleep == 0) |
| 1722 | /* chunksize and time_base need to be |
| 1723 | * set first. */ |
| 1724 | err = -EINVAL; |
| 1725 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1726 | if (err) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1727 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1728 | |
NeilBrown | 624ce4f | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1729 | bitmap->daemon_lastrun = jiffies; |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1730 | bitmap->chunkshift = (ffz(~mddev->bitmap_info.chunksize) |
| 1731 | - BITMAP_BLOCK_SHIFT); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1732 | |
NeilBrown | b16b1b6c | 2012-05-04 17:03:18 +1000 | [diff] [blame] | 1733 | chunks = (blocks + (1 << bitmap->chunkshift) - 1) >> |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1734 | bitmap->chunkshift; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1735 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1736 | |
| 1737 | BUG_ON(!pages); |
| 1738 | |
| 1739 | bitmap->chunks = chunks; |
| 1740 | bitmap->pages = pages; |
| 1741 | bitmap->missing_pages = pages; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1742 | |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1743 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
NeilBrown | 29d3247 | 2011-10-11 16:49:56 +1100 | [diff] [blame] | 1744 | |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1745 | err = -ENOMEM; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1746 | if (!bitmap->bp) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1747 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1748 | |
NeilBrown | bc9891a | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1749 | if (file || mddev->bitmap_info.offset) { |
| 1750 | err = bitmap_storage_alloc(&bitmap->storage, bitmap->chunks, |
| 1751 | !mddev->bitmap_info.external); |
| 1752 | if (err) |
| 1753 | goto error; |
| 1754 | } |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1755 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
| 1756 | pages, bmname(bitmap)); |
| 1757 | |
| 1758 | mddev->bitmap = bitmap; |
| 1759 | |
| 1760 | |
| 1761 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; |
| 1762 | |
| 1763 | error: |
| 1764 | bitmap_free(bitmap); |
| 1765 | return err; |
| 1766 | } |
| 1767 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1768 | int bitmap_load(struct mddev *mddev) |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1769 | { |
| 1770 | int err = 0; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1771 | sector_t start = 0; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1772 | sector_t sector = 0; |
| 1773 | struct bitmap *bitmap = mddev->bitmap; |
| 1774 | |
| 1775 | if (!bitmap) |
| 1776 | goto out; |
| 1777 | |
| 1778 | /* Clear out old bitmap info first: Either there is none, or we |
| 1779 | * are resuming after someone else has possibly changed things, |
| 1780 | * so we should forget old cached info. |
| 1781 | * All chunks should be clean, but some might need_sync. |
| 1782 | */ |
| 1783 | while (sector < mddev->resync_max_sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1784 | sector_t blocks; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1785 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
| 1786 | sector += blocks; |
| 1787 | } |
| 1788 | bitmap_close_sync(bitmap); |
| 1789 | |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1790 | if (mddev->degraded == 0 |
| 1791 | || bitmap->events_cleared == mddev->events) |
| 1792 | /* no need to keep dirty bits to optimise a |
| 1793 | * re-add of a missing device */ |
| 1794 | start = mddev->recovery_cp; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1795 | |
NeilBrown | afbaa90 | 2012-04-12 16:05:06 +1000 | [diff] [blame] | 1796 | mutex_lock(&mddev->bitmap_info.mutex); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1797 | err = bitmap_init_from_disk(bitmap, start); |
NeilBrown | afbaa90 | 2012-04-12 16:05:06 +1000 | [diff] [blame] | 1798 | mutex_unlock(&mddev->bitmap_info.mutex); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1799 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1800 | if (err) |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1801 | goto out; |
NeilBrown | edbb79d | 2012-05-22 13:55:13 +1000 | [diff] [blame] | 1802 | bitmap->flags &= ~BITMAP_STALE; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1803 | |
| 1804 | /* Kick recovery in case any bits were set */ |
| 1805 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1806 | |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1807 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
NeilBrown | 9cd30fd | 2009-12-14 12:49:54 +1100 | [diff] [blame] | 1808 | md_wakeup_thread(mddev->thread); |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1809 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1810 | bitmap_update_sb(bitmap); |
| 1811 | |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1812 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 1813 | err = -EIO; |
| 1814 | out: |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1815 | return err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1816 | } |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1817 | EXPORT_SYMBOL_GPL(bitmap_load); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1818 | |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1819 | void bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
| 1820 | { |
| 1821 | unsigned long chunk_kb; |
| 1822 | unsigned long flags; |
| 1823 | |
| 1824 | if (!bitmap) |
| 1825 | return; |
| 1826 | |
| 1827 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1828 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; |
| 1829 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
| 1830 | "%lu%s chunk", |
| 1831 | bitmap->pages - bitmap->missing_pages, |
| 1832 | bitmap->pages, |
| 1833 | (bitmap->pages - bitmap->missing_pages) |
| 1834 | << (PAGE_SHIFT - 10), |
| 1835 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, |
| 1836 | chunk_kb ? "KB" : "B"); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1837 | if (bitmap->storage.file) { |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1838 | seq_printf(seq, ", file: "); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1839 | seq_path(seq, &bitmap->storage.file->f_path, " \t\n"); |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1840 | } |
| 1841 | |
| 1842 | seq_printf(seq, "\n"); |
| 1843 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1844 | } |
| 1845 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1846 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1847 | location_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1848 | { |
| 1849 | ssize_t len; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1850 | if (mddev->bitmap_info.file) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1851 | len = sprintf(page, "file"); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1852 | else if (mddev->bitmap_info.offset) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1853 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1854 | else |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1855 | len = sprintf(page, "none"); |
| 1856 | len += sprintf(page+len, "\n"); |
| 1857 | return len; |
| 1858 | } |
| 1859 | |
| 1860 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1861 | location_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1862 | { |
| 1863 | |
| 1864 | if (mddev->pers) { |
| 1865 | if (!mddev->pers->quiesce) |
| 1866 | return -EBUSY; |
| 1867 | if (mddev->recovery || mddev->sync_thread) |
| 1868 | return -EBUSY; |
| 1869 | } |
| 1870 | |
| 1871 | if (mddev->bitmap || mddev->bitmap_info.file || |
| 1872 | mddev->bitmap_info.offset) { |
| 1873 | /* bitmap already configured. Only option is to clear it */ |
| 1874 | if (strncmp(buf, "none", 4) != 0) |
| 1875 | return -EBUSY; |
| 1876 | if (mddev->pers) { |
| 1877 | mddev->pers->quiesce(mddev, 1); |
| 1878 | bitmap_destroy(mddev); |
| 1879 | mddev->pers->quiesce(mddev, 0); |
| 1880 | } |
| 1881 | mddev->bitmap_info.offset = 0; |
| 1882 | if (mddev->bitmap_info.file) { |
| 1883 | struct file *f = mddev->bitmap_info.file; |
| 1884 | mddev->bitmap_info.file = NULL; |
| 1885 | restore_bitmap_write_access(f); |
| 1886 | fput(f); |
| 1887 | } |
| 1888 | } else { |
| 1889 | /* No bitmap, OK to set a location */ |
| 1890 | long long offset; |
| 1891 | if (strncmp(buf, "none", 4) == 0) |
| 1892 | /* nothing to be done */; |
| 1893 | else if (strncmp(buf, "file:", 5) == 0) { |
| 1894 | /* Not supported yet */ |
| 1895 | return -EINVAL; |
| 1896 | } else { |
| 1897 | int rv; |
| 1898 | if (buf[0] == '+') |
| 1899 | rv = strict_strtoll(buf+1, 10, &offset); |
| 1900 | else |
| 1901 | rv = strict_strtoll(buf, 10, &offset); |
| 1902 | if (rv) |
| 1903 | return rv; |
| 1904 | if (offset == 0) |
| 1905 | return -EINVAL; |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1906 | if (mddev->bitmap_info.external == 0 && |
| 1907 | mddev->major_version == 0 && |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1908 | offset != mddev->bitmap_info.default_offset) |
| 1909 | return -EINVAL; |
| 1910 | mddev->bitmap_info.offset = offset; |
| 1911 | if (mddev->pers) { |
| 1912 | mddev->pers->quiesce(mddev, 1); |
| 1913 | rv = bitmap_create(mddev); |
NeilBrown | 4474ca4 | 2012-03-19 12:46:37 +1100 | [diff] [blame] | 1914 | if (!rv) |
| 1915 | rv = bitmap_load(mddev); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1916 | if (rv) { |
| 1917 | bitmap_destroy(mddev); |
| 1918 | mddev->bitmap_info.offset = 0; |
| 1919 | } |
| 1920 | mddev->pers->quiesce(mddev, 0); |
| 1921 | if (rv) |
| 1922 | return rv; |
| 1923 | } |
| 1924 | } |
| 1925 | } |
| 1926 | if (!mddev->external) { |
| 1927 | /* Ensure new bitmap info is stored in |
| 1928 | * metadata promptly. |
| 1929 | */ |
| 1930 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| 1931 | md_wakeup_thread(mddev->thread); |
| 1932 | } |
| 1933 | return len; |
| 1934 | } |
| 1935 | |
| 1936 | static struct md_sysfs_entry bitmap_location = |
| 1937 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); |
| 1938 | |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 1939 | /* 'bitmap/space' is the space available at 'location' for the |
| 1940 | * bitmap. This allows the kernel to know when it is safe to |
| 1941 | * resize the bitmap to match a resized array. |
| 1942 | */ |
| 1943 | static ssize_t |
| 1944 | space_show(struct mddev *mddev, char *page) |
| 1945 | { |
| 1946 | return sprintf(page, "%lu\n", mddev->bitmap_info.space); |
| 1947 | } |
| 1948 | |
| 1949 | static ssize_t |
| 1950 | space_store(struct mddev *mddev, const char *buf, size_t len) |
| 1951 | { |
| 1952 | unsigned long sectors; |
| 1953 | int rv; |
| 1954 | |
| 1955 | rv = kstrtoul(buf, 10, §ors); |
| 1956 | if (rv) |
| 1957 | return rv; |
| 1958 | |
| 1959 | if (sectors == 0) |
| 1960 | return -EINVAL; |
| 1961 | |
| 1962 | if (mddev->bitmap && |
NeilBrown | 9b1215c | 2012-05-22 13:55:11 +1000 | [diff] [blame] | 1963 | sectors < (mddev->bitmap->storage.bytes + 511) >> 9) |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 1964 | return -EFBIG; /* Bitmap is too big for this small space */ |
| 1965 | |
| 1966 | /* could make sure it isn't too big, but that isn't really |
| 1967 | * needed - user-space should be careful. |
| 1968 | */ |
| 1969 | mddev->bitmap_info.space = sectors; |
| 1970 | return len; |
| 1971 | } |
| 1972 | |
| 1973 | static struct md_sysfs_entry bitmap_space = |
| 1974 | __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); |
| 1975 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1976 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1977 | timeout_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1978 | { |
| 1979 | ssize_t len; |
| 1980 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; |
| 1981 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1982 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1983 | len = sprintf(page, "%lu", secs); |
| 1984 | if (jifs) |
| 1985 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); |
| 1986 | len += sprintf(page+len, "\n"); |
| 1987 | return len; |
| 1988 | } |
| 1989 | |
| 1990 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1991 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 1992 | { |
| 1993 | /* timeout can be set at any time */ |
| 1994 | unsigned long timeout; |
| 1995 | int rv = strict_strtoul_scaled(buf, &timeout, 4); |
| 1996 | if (rv) |
| 1997 | return rv; |
| 1998 | |
| 1999 | /* just to make sure we don't overflow... */ |
| 2000 | if (timeout >= LONG_MAX / HZ) |
| 2001 | return -EINVAL; |
| 2002 | |
| 2003 | timeout = timeout * HZ / 10000; |
| 2004 | |
| 2005 | if (timeout >= MAX_SCHEDULE_TIMEOUT) |
| 2006 | timeout = MAX_SCHEDULE_TIMEOUT-1; |
| 2007 | if (timeout < 1) |
| 2008 | timeout = 1; |
| 2009 | mddev->bitmap_info.daemon_sleep = timeout; |
| 2010 | if (mddev->thread) { |
| 2011 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then |
| 2012 | * the bitmap is all clean and we don't need to |
| 2013 | * adjust the timeout right now |
| 2014 | */ |
| 2015 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { |
| 2016 | mddev->thread->timeout = timeout; |
| 2017 | md_wakeup_thread(mddev->thread); |
| 2018 | } |
| 2019 | } |
| 2020 | return len; |
| 2021 | } |
| 2022 | |
| 2023 | static struct md_sysfs_entry bitmap_timeout = |
| 2024 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); |
| 2025 | |
| 2026 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2027 | backlog_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2028 | { |
| 2029 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); |
| 2030 | } |
| 2031 | |
| 2032 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2033 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2034 | { |
| 2035 | unsigned long backlog; |
| 2036 | int rv = strict_strtoul(buf, 10, &backlog); |
| 2037 | if (rv) |
| 2038 | return rv; |
| 2039 | if (backlog > COUNTER_MAX) |
| 2040 | return -EINVAL; |
| 2041 | mddev->bitmap_info.max_write_behind = backlog; |
| 2042 | return len; |
| 2043 | } |
| 2044 | |
| 2045 | static struct md_sysfs_entry bitmap_backlog = |
| 2046 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); |
| 2047 | |
| 2048 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2049 | chunksize_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2050 | { |
| 2051 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); |
| 2052 | } |
| 2053 | |
| 2054 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2055 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2056 | { |
| 2057 | /* Can only be changed when no bitmap is active */ |
| 2058 | int rv; |
| 2059 | unsigned long csize; |
| 2060 | if (mddev->bitmap) |
| 2061 | return -EBUSY; |
| 2062 | rv = strict_strtoul(buf, 10, &csize); |
| 2063 | if (rv) |
| 2064 | return rv; |
| 2065 | if (csize < 512 || |
| 2066 | !is_power_of_2(csize)) |
| 2067 | return -EINVAL; |
| 2068 | mddev->bitmap_info.chunksize = csize; |
| 2069 | return len; |
| 2070 | } |
| 2071 | |
| 2072 | static struct md_sysfs_entry bitmap_chunksize = |
| 2073 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); |
| 2074 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2075 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2076 | { |
| 2077 | return sprintf(page, "%s\n", (mddev->bitmap_info.external |
| 2078 | ? "external" : "internal")); |
| 2079 | } |
| 2080 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2081 | static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2082 | { |
| 2083 | if (mddev->bitmap || |
| 2084 | mddev->bitmap_info.file || |
| 2085 | mddev->bitmap_info.offset) |
| 2086 | return -EBUSY; |
| 2087 | if (strncmp(buf, "external", 8) == 0) |
| 2088 | mddev->bitmap_info.external = 1; |
| 2089 | else if (strncmp(buf, "internal", 8) == 0) |
| 2090 | mddev->bitmap_info.external = 0; |
| 2091 | else |
| 2092 | return -EINVAL; |
| 2093 | return len; |
| 2094 | } |
| 2095 | |
| 2096 | static struct md_sysfs_entry bitmap_metadata = |
| 2097 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
| 2098 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2099 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2100 | { |
| 2101 | int len; |
| 2102 | if (mddev->bitmap) |
| 2103 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? |
| 2104 | "false" : "true")); |
| 2105 | else |
| 2106 | len = sprintf(page, "\n"); |
| 2107 | return len; |
| 2108 | } |
| 2109 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2110 | static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2111 | { |
| 2112 | if (mddev->bitmap == NULL) |
| 2113 | return -ENOENT; |
| 2114 | if (strncmp(buf, "false", 5) == 0) |
| 2115 | mddev->bitmap->need_sync = 1; |
| 2116 | else if (strncmp(buf, "true", 4) == 0) { |
| 2117 | if (mddev->degraded) |
| 2118 | return -EBUSY; |
| 2119 | mddev->bitmap->need_sync = 0; |
| 2120 | } else |
| 2121 | return -EINVAL; |
| 2122 | return len; |
| 2123 | } |
| 2124 | |
| 2125 | static struct md_sysfs_entry bitmap_can_clear = |
| 2126 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); |
| 2127 | |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2128 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2129 | behind_writes_used_show(struct mddev *mddev, char *page) |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2130 | { |
| 2131 | if (mddev->bitmap == NULL) |
| 2132 | return sprintf(page, "0\n"); |
| 2133 | return sprintf(page, "%lu\n", |
| 2134 | mddev->bitmap->behind_writes_used); |
| 2135 | } |
| 2136 | |
| 2137 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2138 | behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2139 | { |
| 2140 | if (mddev->bitmap) |
| 2141 | mddev->bitmap->behind_writes_used = 0; |
| 2142 | return len; |
| 2143 | } |
| 2144 | |
| 2145 | static struct md_sysfs_entry max_backlog_used = |
| 2146 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, |
| 2147 | behind_writes_used_show, behind_writes_used_reset); |
| 2148 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2149 | static struct attribute *md_bitmap_attrs[] = { |
| 2150 | &bitmap_location.attr, |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 2151 | &bitmap_space.attr, |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2152 | &bitmap_timeout.attr, |
| 2153 | &bitmap_backlog.attr, |
| 2154 | &bitmap_chunksize.attr, |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2155 | &bitmap_metadata.attr, |
| 2156 | &bitmap_can_clear.attr, |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2157 | &max_backlog_used.attr, |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2158 | NULL |
| 2159 | }; |
| 2160 | struct attribute_group md_bitmap_group = { |
| 2161 | .name = "bitmap", |
| 2162 | .attrs = md_bitmap_attrs, |
| 2163 | }; |
| 2164 | |