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 | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 48 | static int bitmap_checkpage(struct bitmap_counts *bitmap, |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 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 | d959014 | 2015-02-02 17:08:03 +1100 | [diff] [blame] | 75 | /* It is possible that this is being called inside a |
| 76 | * prepare_to_wait/finish_wait loop from raid5c:make_request(). |
| 77 | * In general it is not permitted to sleep in that context as it |
| 78 | * can cause the loop to spin freely. |
| 79 | * That doesn't apply here as we can only reach this point |
| 80 | * once with any loop. |
| 81 | * When this function completes, either bp[page].map or |
| 82 | * bp[page].hijacked. In either case, this function will |
| 83 | * abort before getting to this point again. So there is |
| 84 | * no risk of a free-spin, and so it is safe to assert |
| 85 | * that sleeping here is allowed. |
| 86 | */ |
| 87 | sched_annotate_sleep(); |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 88 | mappage = kzalloc(PAGE_SIZE, GFP_NOIO); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 89 | spin_lock_irq(&bitmap->lock); |
| 90 | |
| 91 | if (mappage == NULL) { |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 92 | pr_debug("md/bitmap: map page allocation failed, hijacking\n"); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 93 | /* failed - set the hijacked flag so that we can use the |
| 94 | * pointer as a counter */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 95 | if (!bitmap->bp[page].map) |
| 96 | bitmap->bp[page].hijacked = 1; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 97 | } else if (bitmap->bp[page].map || |
| 98 | bitmap->bp[page].hijacked) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 99 | /* somebody beat us to getting the page */ |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 100 | kfree(mappage); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 101 | return 0; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 102 | } else { |
| 103 | |
| 104 | /* no page was in place and we have one, so install it */ |
| 105 | |
| 106 | bitmap->bp[page].map = mappage; |
| 107 | bitmap->missing_pages--; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 108 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 109 | return 0; |
| 110 | } |
| 111 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 112 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
| 113 | /* if page was hijacked, unmark the flag so it might get alloced next time */ |
| 114 | /* Note: lock should be held when calling this */ |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 115 | static void bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 116 | { |
| 117 | char *ptr; |
| 118 | |
| 119 | if (bitmap->bp[page].count) /* page is still busy */ |
| 120 | return; |
| 121 | |
| 122 | /* page is no longer in use, it can be released */ |
| 123 | |
| 124 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ |
| 125 | bitmap->bp[page].hijacked = 0; |
| 126 | bitmap->bp[page].map = NULL; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 127 | } else { |
| 128 | /* normal case, free the page */ |
| 129 | ptr = bitmap->bp[page].map; |
| 130 | bitmap->bp[page].map = NULL; |
| 131 | bitmap->missing_pages++; |
NeilBrown | 792a1d4 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 132 | kfree(ptr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 133 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 134 | } |
| 135 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 136 | /* |
| 137 | * bitmap file handling - read and write the bitmap file and its superblock |
| 138 | */ |
| 139 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 140 | /* |
| 141 | * basic page I/O operations |
| 142 | */ |
| 143 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 144 | /* IO operations when bitmap is stored near all superblocks */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 145 | static int read_sb_page(struct mddev *mddev, loff_t offset, |
| 146 | struct page *page, |
| 147 | unsigned long index, int size) |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 148 | { |
| 149 | /* choose a good rdev and read the page from there */ |
| 150 | |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 151 | struct md_rdev *rdev; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 152 | sector_t target; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 153 | |
NeilBrown | dafb20f | 2012-03-19 12:46:39 +1100 | [diff] [blame] | 154 | rdev_for_each(rdev, mddev) { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 155 | if (! test_bit(In_sync, &rdev->flags) |
| 156 | || test_bit(Faulty, &rdev->flags)) |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 157 | continue; |
| 158 | |
Jonathan Brassow | ccebd4c | 2011-01-14 09:14:33 +1100 | [diff] [blame] | 159 | target = offset + index * (PAGE_SIZE/512); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 160 | |
NeilBrown | 2b19336 | 2010-10-27 15:16:40 +1100 | [diff] [blame] | 161 | if (sync_page_io(rdev, target, |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 162 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
Jonathan Brassow | ccebd4c | 2011-01-14 09:14:33 +1100 | [diff] [blame] | 163 | page, READ, true)) { |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 164 | page->index = index; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 165 | return 0; |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 166 | } |
| 167 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 168 | return -EIO; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 169 | } |
| 170 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 171 | 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] | 172 | { |
| 173 | /* Iterate the disks of an mddev, using rcu to protect access to the |
| 174 | * linked list, and raising the refcount of devices we return to ensure |
| 175 | * they don't disappear while in use. |
| 176 | * As devices are only added or removed when raid_disk is < 0 and |
| 177 | * nr_pending is 0 and In_sync is clear, the entries we return will |
| 178 | * still be in the same position on the list when we re-enter |
Michael Wang | fd17748 | 2012-10-11 13:43:21 +1100 | [diff] [blame] | 179 | * list_for_each_entry_continue_rcu. |
NeilBrown | 8532e34 | 2015-05-20 15:05:09 +1000 | [diff] [blame] | 180 | * |
| 181 | * Note that if entered with 'rdev == NULL' to start at the |
| 182 | * beginning, we temporarily assign 'rdev' to an address which |
| 183 | * isn't really an rdev, but which can be used by |
| 184 | * list_for_each_entry_continue_rcu() to find the first entry. |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 185 | */ |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 186 | rcu_read_lock(); |
| 187 | if (rdev == NULL) |
| 188 | /* start at the beginning */ |
NeilBrown | 8532e34 | 2015-05-20 15:05:09 +1000 | [diff] [blame] | 189 | rdev = list_entry(&mddev->disks, struct md_rdev, same_set); |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 190 | else { |
| 191 | /* release the previous rdev and start from there. */ |
| 192 | rdev_dec_pending(rdev, mddev); |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 193 | } |
Michael Wang | fd17748 | 2012-10-11 13:43:21 +1100 | [diff] [blame] | 194 | list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) { |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 195 | if (rdev->raid_disk >= 0 && |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 196 | !test_bit(Faulty, &rdev->flags)) { |
| 197 | /* this is a usable devices */ |
| 198 | atomic_inc(&rdev->nr_pending); |
| 199 | rcu_read_unlock(); |
| 200 | return rdev; |
| 201 | } |
| 202 | } |
| 203 | rcu_read_unlock(); |
| 204 | return NULL; |
| 205 | } |
| 206 | |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 207 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 208 | { |
NeilBrown | 3cb0300 | 2011-10-11 16:45:26 +1100 | [diff] [blame] | 209 | struct md_rdev *rdev = NULL; |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 210 | struct block_device *bdev; |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 211 | struct mddev *mddev = bitmap->mddev; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 212 | struct bitmap_storage *store = &bitmap->storage; |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 213 | int node_offset = 0; |
| 214 | |
| 215 | if (mddev_is_clustered(bitmap->mddev)) |
| 216 | node_offset = bitmap->cluster_slot * store->file_pages; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 217 | |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 218 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 219 | int size = PAGE_SIZE; |
| 220 | loff_t offset = mddev->bitmap_info.offset; |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 221 | |
| 222 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; |
| 223 | |
NeilBrown | 9b1215c | 2012-05-22 13:55:11 +1000 | [diff] [blame] | 224 | if (page->index == store->file_pages-1) { |
| 225 | int last_page_size = store->bytes & (PAGE_SIZE-1); |
| 226 | if (last_page_size == 0) |
| 227 | last_page_size = PAGE_SIZE; |
| 228 | size = roundup(last_page_size, |
Jonathan Brassow | a6ff7e0 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 229 | bdev_logical_block_size(bdev)); |
NeilBrown | 9b1215c | 2012-05-22 13:55:11 +1000 | [diff] [blame] | 230 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 231 | /* Just make sure we aren't corrupting data or |
| 232 | * metadata |
| 233 | */ |
| 234 | if (mddev->external) { |
| 235 | /* Bitmap could be anywhere. */ |
| 236 | if (rdev->sb_start + offset + (page->index |
| 237 | * (PAGE_SIZE/512)) |
| 238 | > rdev->data_offset |
| 239 | && |
| 240 | rdev->sb_start + offset |
| 241 | < (rdev->data_offset + mddev->dev_sectors |
| 242 | + (PAGE_SIZE/512))) |
| 243 | goto bad_alignment; |
| 244 | } else if (offset < 0) { |
| 245 | /* DATA BITMAP METADATA */ |
| 246 | if (offset |
| 247 | + (long)(page->index * (PAGE_SIZE/512)) |
| 248 | + size/512 > 0) |
| 249 | /* bitmap runs in to metadata */ |
| 250 | goto bad_alignment; |
| 251 | if (rdev->data_offset + mddev->dev_sectors |
| 252 | > rdev->sb_start + offset) |
| 253 | /* data runs in to bitmap */ |
| 254 | goto bad_alignment; |
| 255 | } else if (rdev->sb_start < rdev->data_offset) { |
| 256 | /* METADATA BITMAP DATA */ |
| 257 | if (rdev->sb_start |
| 258 | + offset |
| 259 | + page->index*(PAGE_SIZE/512) + size/512 |
| 260 | > rdev->data_offset) |
| 261 | /* bitmap runs in to data */ |
| 262 | goto bad_alignment; |
| 263 | } else { |
| 264 | /* DATA METADATA BITMAP - no problems */ |
| 265 | } |
| 266 | md_super_write(mddev, rdev, |
| 267 | rdev->sb_start + offset |
| 268 | + page->index * (PAGE_SIZE/512), |
| 269 | size, |
| 270 | page); |
NeilBrown | b2d2c4c | 2008-09-01 12:48:13 +1000 | [diff] [blame] | 271 | } |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 272 | |
| 273 | if (wait) |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 274 | md_super_wait(mddev); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 275 | return 0; |
NeilBrown | 4b80991 | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 276 | |
| 277 | bad_alignment: |
NeilBrown | 4b80991 | 2008-07-21 17:05:25 +1000 | [diff] [blame] | 278 | return -EINVAL; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 279 | } |
| 280 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 281 | static void bitmap_file_kick(struct bitmap *bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 282 | /* |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 283 | * write out a page to a file |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 284 | */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 285 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 286 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 287 | struct buffer_head *bh; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 288 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 289 | if (bitmap->storage.file == NULL) { |
NeilBrown | f0d76d7 | 2007-07-17 04:06:12 -0700 | [diff] [blame] | 290 | switch (write_sb_page(bitmap, page, wait)) { |
| 291 | case -EINVAL: |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 292 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); |
NeilBrown | f0d76d7 | 2007-07-17 04:06:12 -0700 | [diff] [blame] | 293 | } |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 294 | } else { |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 295 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 296 | bh = page_buffers(page); |
NeilBrown | c708443 | 2006-01-06 00:20:45 -0800 | [diff] [blame] | 297 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 298 | while (bh && bh->b_blocknr) { |
| 299 | atomic_inc(&bitmap->pending_writes); |
| 300 | set_buffer_locked(bh); |
| 301 | set_buffer_mapped(bh); |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 302 | submit_bh(WRITE | REQ_SYNC, bh); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 303 | bh = bh->b_this_page; |
| 304 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 305 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 306 | if (wait) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 307 | wait_event(bitmap->write_wait, |
| 308 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 309 | } |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 310 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 311 | bitmap_file_kick(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 312 | } |
| 313 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 314 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 315 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 316 | struct bitmap *bitmap = bh->b_private; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 317 | |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 318 | if (!uptodate) |
| 319 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 320 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
| 321 | wake_up(&bitmap->write_wait); |
| 322 | } |
| 323 | |
| 324 | /* copied from buffer.c */ |
| 325 | static void |
| 326 | __clear_page_buffers(struct page *page) |
| 327 | { |
| 328 | ClearPagePrivate(page); |
| 329 | set_page_private(page, 0); |
| 330 | page_cache_release(page); |
| 331 | } |
| 332 | static void free_buffers(struct page *page) |
| 333 | { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 334 | struct buffer_head *bh; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 335 | |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 336 | if (!PagePrivate(page)) |
| 337 | return; |
| 338 | |
| 339 | bh = page_buffers(page); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 340 | while (bh) { |
| 341 | struct buffer_head *next = bh->b_this_page; |
| 342 | free_buffer_head(bh); |
| 343 | bh = next; |
| 344 | } |
| 345 | __clear_page_buffers(page); |
| 346 | put_page(page); |
| 347 | } |
| 348 | |
| 349 | /* read a page from a file. |
| 350 | * We both read the page, and attach buffers to the page to record the |
| 351 | * address of each block (using bmap). These addresses will be used |
| 352 | * to write the block later, completely bypassing the filesystem. |
| 353 | * This usage is similar to how swap files are handled, and allows us |
| 354 | * to write to a file with no concerns of memory allocation failing. |
| 355 | */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 356 | static int read_page(struct file *file, unsigned long index, |
| 357 | struct bitmap *bitmap, |
| 358 | unsigned long count, |
| 359 | struct page *page) |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 360 | { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 361 | int ret = 0; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 362 | struct inode *inode = file_inode(file); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 363 | struct buffer_head *bh; |
| 364 | sector_t block; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 365 | |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 366 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
| 367 | (unsigned long long)index << PAGE_SHIFT); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 368 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 369 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
| 370 | if (!bh) { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 371 | ret = -ENOMEM; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 372 | goto out; |
| 373 | } |
| 374 | attach_page_buffers(page, bh); |
| 375 | block = index << (PAGE_SHIFT - inode->i_blkbits); |
| 376 | while (bh) { |
| 377 | if (count == 0) |
| 378 | bh->b_blocknr = 0; |
| 379 | else { |
| 380 | bh->b_blocknr = bmap(inode, block); |
| 381 | if (bh->b_blocknr == 0) { |
| 382 | /* Cannot use this file! */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 383 | ret = -EINVAL; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 384 | goto out; |
| 385 | } |
| 386 | bh->b_bdev = inode->i_sb->s_bdev; |
| 387 | if (count < (1<<inode->i_blkbits)) |
| 388 | count = 0; |
| 389 | else |
| 390 | count -= (1<<inode->i_blkbits); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 391 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 392 | bh->b_end_io = end_bitmap_write; |
| 393 | bh->b_private = bitmap; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 394 | atomic_inc(&bitmap->pending_writes); |
| 395 | set_buffer_locked(bh); |
| 396 | set_buffer_mapped(bh); |
| 397 | submit_bh(READ, bh); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 398 | } |
| 399 | block++; |
| 400 | bh = bh->b_this_page; |
| 401 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 402 | page->index = index; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 403 | |
| 404 | wait_event(bitmap->write_wait, |
| 405 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 406 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 407 | ret = -EIO; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 408 | out: |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 409 | if (ret) |
| 410 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %d\n", |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 411 | (int)PAGE_SIZE, |
| 412 | (unsigned long long)index << PAGE_SHIFT, |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 413 | ret); |
| 414 | return ret; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 415 | } |
| 416 | |
| 417 | /* |
| 418 | * bitmap file superblock operations |
| 419 | */ |
| 420 | |
| 421 | /* update the event counter and sync the superblock to disk */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 422 | void bitmap_update_sb(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 423 | { |
| 424 | bitmap_super_t *sb; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 425 | |
| 426 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 427 | return; |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 428 | if (bitmap->mddev->bitmap_info.external) |
| 429 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 430 | if (!bitmap->storage.sb_page) /* no superblock */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 431 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 432 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 433 | sb->events = cpu_to_le64(bitmap->mddev->events); |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 434 | if (bitmap->mddev->events < bitmap->events_cleared) |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 435 | /* rocking back to read-only */ |
| 436 | bitmap->events_cleared = bitmap->mddev->events; |
NeilBrown | 8258c53 | 2011-05-11 14:26:30 +1000 | [diff] [blame] | 437 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
| 438 | sb->state = cpu_to_le32(bitmap->flags); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 439 | /* Just in case these have been changed via sysfs: */ |
| 440 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); |
| 441 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); |
NeilBrown | b81a040 | 2012-05-22 13:55:26 +1000 | [diff] [blame] | 442 | /* This might have been changed by a reshape */ |
| 443 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 444 | sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize); |
Goldwyn Rodrigues | c4ce867 | 2014-03-29 10:20:02 -0500 | [diff] [blame] | 445 | sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes); |
NeilBrown | 1dff2b8 | 2012-05-22 13:55:34 +1000 | [diff] [blame] | 446 | sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> |
| 447 | bitmap_info.space); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 448 | kunmap_atomic(sb); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 449 | write_page(bitmap, bitmap->storage.sb_page, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | /* print out the bitmap file superblock */ |
| 453 | void bitmap_print_sb(struct bitmap *bitmap) |
| 454 | { |
| 455 | bitmap_super_t *sb; |
| 456 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 457 | if (!bitmap || !bitmap->storage.sb_page) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 458 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 459 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 460 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 461 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
| 462 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); |
| 463 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 464 | *(__u32 *)(sb->uuid+0), |
| 465 | *(__u32 *)(sb->uuid+4), |
| 466 | *(__u32 *)(sb->uuid+8), |
| 467 | *(__u32 *)(sb->uuid+12)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 468 | printk(KERN_DEBUG " events: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 469 | (unsigned long long) le64_to_cpu(sb->events)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 470 | printk(KERN_DEBUG "events cleared: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 471 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 472 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
| 473 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); |
| 474 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); |
| 475 | printk(KERN_DEBUG " sync size: %llu KB\n", |
| 476 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 477 | 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] | 478 | kunmap_atomic(sb); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 479 | } |
| 480 | |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 481 | /* |
| 482 | * bitmap_new_disk_sb |
| 483 | * @bitmap |
| 484 | * |
| 485 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb |
| 486 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. |
| 487 | * This function verifies 'bitmap_info' and populates the on-disk bitmap |
| 488 | * structure, which is to be written to disk. |
| 489 | * |
| 490 | * Returns: 0 on success, -Exxx on error |
| 491 | */ |
| 492 | static int bitmap_new_disk_sb(struct bitmap *bitmap) |
| 493 | { |
| 494 | bitmap_super_t *sb; |
| 495 | unsigned long chunksize, daemon_sleep, write_behind; |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 496 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 497 | bitmap->storage.sb_page = alloc_page(GFP_KERNEL); |
Jianpeng Ma | 582e2e0 | 2012-10-11 13:45:36 +1100 | [diff] [blame] | 498 | if (bitmap->storage.sb_page == NULL) |
| 499 | return -ENOMEM; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 500 | bitmap->storage.sb_page->index = 0; |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 501 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 502 | sb = kmap_atomic(bitmap->storage.sb_page); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 503 | |
| 504 | sb->magic = cpu_to_le32(BITMAP_MAGIC); |
| 505 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); |
| 506 | |
| 507 | chunksize = bitmap->mddev->bitmap_info.chunksize; |
| 508 | BUG_ON(!chunksize); |
| 509 | if (!is_power_of_2(chunksize)) { |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 510 | kunmap_atomic(sb); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 511 | printk(KERN_ERR "bitmap chunksize not a power of 2\n"); |
| 512 | return -EINVAL; |
| 513 | } |
| 514 | sb->chunksize = cpu_to_le32(chunksize); |
| 515 | |
| 516 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; |
| 517 | if (!daemon_sleep || |
| 518 | (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { |
| 519 | printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n"); |
| 520 | daemon_sleep = 5 * HZ; |
| 521 | } |
| 522 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); |
| 523 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; |
| 524 | |
| 525 | /* |
| 526 | * FIXME: write_behind for RAID1. If not specified, what |
| 527 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. |
| 528 | */ |
| 529 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; |
| 530 | if (write_behind > COUNTER_MAX) |
| 531 | write_behind = COUNTER_MAX / 2; |
| 532 | sb->write_behind = cpu_to_le32(write_behind); |
| 533 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
| 534 | |
| 535 | /* keep the array size field of the bitmap superblock up to date */ |
| 536 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 537 | |
| 538 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); |
| 539 | |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 540 | set_bit(BITMAP_STALE, &bitmap->flags); |
NeilBrown | 84e9234 | 2012-05-22 13:55:14 +1000 | [diff] [blame] | 541 | sb->state = cpu_to_le32(bitmap->flags); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 542 | bitmap->events_cleared = bitmap->mddev->events; |
| 543 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); |
| 544 | |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 545 | kunmap_atomic(sb); |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 550 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
| 551 | static int bitmap_read_sb(struct bitmap *bitmap) |
| 552 | { |
| 553 | char *reason = NULL; |
| 554 | bitmap_super_t *sb; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 555 | unsigned long chunksize, daemon_sleep, write_behind; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 556 | unsigned long long events; |
Goldwyn Rodrigues | c4ce867 | 2014-03-29 10:20:02 -0500 | [diff] [blame] | 557 | int nodes = 0; |
NeilBrown | 1dff2b8 | 2012-05-22 13:55:34 +1000 | [diff] [blame] | 558 | unsigned long sectors_reserved = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 559 | int err = -EINVAL; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 560 | struct page *sb_page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 561 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 562 | if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 563 | chunksize = 128 * 1024 * 1024; |
| 564 | daemon_sleep = 5 * HZ; |
| 565 | write_behind = 0; |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 566 | set_bit(BITMAP_STALE, &bitmap->flags); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 567 | err = 0; |
| 568 | goto out_no_sb; |
| 569 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 570 | /* page 0 is the superblock, read it... */ |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 571 | sb_page = alloc_page(GFP_KERNEL); |
| 572 | if (!sb_page) |
| 573 | return -ENOMEM; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 574 | bitmap->storage.sb_page = sb_page; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 575 | |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 576 | re_read: |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 577 | /* If cluster_slot is set, the cluster is setup */ |
| 578 | if (bitmap->cluster_slot >= 0) { |
Stephen Rothwell | 3b0e6aa | 2015-03-03 13:35:31 +1100 | [diff] [blame] | 579 | sector_t bm_blocks = bitmap->mddev->resync_max_sectors; |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 580 | |
Stephen Rothwell | 3b0e6aa | 2015-03-03 13:35:31 +1100 | [diff] [blame] | 581 | sector_div(bm_blocks, |
| 582 | bitmap->mddev->bitmap_info.chunksize >> 9); |
Goldwyn Rodrigues | 124eb76 | 2015-03-24 11:29:05 -0500 | [diff] [blame] | 583 | /* bits to bytes */ |
| 584 | bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t); |
| 585 | /* to 4k blocks */ |
NeilBrown | 935f3d4 | 2015-03-02 17:02:29 +1100 | [diff] [blame] | 586 | bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096); |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 587 | bitmap->mddev->bitmap_info.offset += bitmap->cluster_slot * (bm_blocks << 3); |
| 588 | pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__, |
| 589 | bitmap->cluster_slot, (unsigned long long)bitmap->mddev->bitmap_info.offset); |
| 590 | } |
| 591 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 592 | if (bitmap->storage.file) { |
| 593 | loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 594 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
| 595 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 596 | err = read_page(bitmap->storage.file, 0, |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 597 | bitmap, bytes, sb_page); |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 598 | } else { |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 599 | err = read_sb_page(bitmap->mddev, |
| 600 | bitmap->mddev->bitmap_info.offset, |
| 601 | sb_page, |
| 602 | 0, sizeof(bitmap_super_t)); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 603 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 604 | if (err) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 605 | return err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 606 | |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 607 | err = -EINVAL; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 608 | sb = kmap_atomic(sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 609 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 610 | chunksize = le32_to_cpu(sb->chunksize); |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 611 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 612 | write_behind = le32_to_cpu(sb->write_behind); |
NeilBrown | 1dff2b8 | 2012-05-22 13:55:34 +1000 | [diff] [blame] | 613 | sectors_reserved = le32_to_cpu(sb->sectors_reserved); |
Goldwyn Rodrigues | c4ce867 | 2014-03-29 10:20:02 -0500 | [diff] [blame] | 614 | nodes = le32_to_cpu(sb->nodes); |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 615 | strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 616 | |
| 617 | /* verify that the bitmap-specific fields are valid */ |
| 618 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) |
| 619 | reason = "bad magic"; |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 620 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
| 621 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 622 | reason = "unrecognized superblock version"; |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 623 | else if (chunksize < 512) |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 624 | reason = "bitmap chunksize too small"; |
Jonathan Brassow | d744540 | 2011-06-08 18:01:10 -0500 | [diff] [blame] | 625 | else if (!is_power_of_2(chunksize)) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 626 | reason = "bitmap chunksize not a power of 2"; |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 627 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 628 | reason = "daemon sleep period out of range"; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 629 | else if (write_behind > COUNTER_MAX) |
| 630 | reason = "write-behind limit out of range (0 - 16383)"; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 631 | if (reason) { |
| 632 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", |
| 633 | bmname(bitmap), reason); |
| 634 | goto out; |
| 635 | } |
| 636 | |
| 637 | /* keep the array size field of the bitmap superblock up to date */ |
| 638 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 639 | |
NeilBrown | 278c1ca | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 640 | if (bitmap->mddev->persistent) { |
| 641 | /* |
| 642 | * We have a persistent array superblock, so compare the |
| 643 | * bitmap's UUID and event counter to the mddev's |
| 644 | */ |
| 645 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { |
| 646 | printk(KERN_INFO |
| 647 | "%s: bitmap superblock UUID mismatch\n", |
| 648 | bmname(bitmap)); |
| 649 | goto out; |
| 650 | } |
| 651 | events = le64_to_cpu(sb->events); |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 652 | if (!nodes && (events < bitmap->mddev->events)) { |
NeilBrown | 278c1ca | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 653 | printk(KERN_INFO |
| 654 | "%s: bitmap file is out of date (%llu < %llu) " |
| 655 | "-- forcing full recovery\n", |
| 656 | bmname(bitmap), events, |
| 657 | (unsigned long long) bitmap->mddev->events); |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 658 | set_bit(BITMAP_STALE, &bitmap->flags); |
NeilBrown | 278c1ca | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 659 | } |
| 660 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 661 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 662 | /* assign fields using values from superblock */ |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 663 | bitmap->flags |= le32_to_cpu(sb->state); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 664 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 665 | set_bit(BITMAP_HOSTENDIAN, &bitmap->flags); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 666 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
Goldwyn Rodrigues | cf921cc | 2014-03-30 00:42:49 -0500 | [diff] [blame] | 667 | strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 668 | err = 0; |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 669 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 670 | out: |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 671 | kunmap_atomic(sb); |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 672 | /* Assiging chunksize is required for "re_read" */ |
| 673 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
| 674 | if (nodes && (bitmap->cluster_slot < 0)) { |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 675 | err = md_setup_cluster(bitmap->mddev, nodes); |
| 676 | if (err) { |
| 677 | pr_err("%s: Could not setup cluster service (%d)\n", |
| 678 | bmname(bitmap), err); |
| 679 | goto out_no_sb; |
| 680 | } |
| 681 | bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev); |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 682 | goto re_read; |
| 683 | } |
| 684 | |
| 685 | |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 686 | out_no_sb: |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 687 | if (test_bit(BITMAP_STALE, &bitmap->flags)) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 688 | bitmap->events_cleared = bitmap->mddev->events; |
| 689 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
| 690 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; |
| 691 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
Goldwyn Rodrigues | c4ce867 | 2014-03-29 10:20:02 -0500 | [diff] [blame] | 692 | bitmap->mddev->bitmap_info.nodes = nodes; |
NeilBrown | 1dff2b8 | 2012-05-22 13:55:34 +1000 | [diff] [blame] | 693 | if (bitmap->mddev->bitmap_info.space == 0 || |
| 694 | bitmap->mddev->bitmap_info.space > sectors_reserved) |
| 695 | bitmap->mddev->bitmap_info.space = sectors_reserved; |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 696 | if (err) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 697 | bitmap_print_sb(bitmap); |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 698 | if (bitmap->cluster_slot < 0) |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 699 | md_cluster_stop(bitmap->mddev); |
| 700 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 701 | return err; |
| 702 | } |
| 703 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 704 | /* |
| 705 | * general bitmap file operations |
| 706 | */ |
| 707 | |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 708 | /* |
| 709 | * on-disk bitmap: |
| 710 | * |
| 711 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap |
| 712 | * file a page at a time. There's a superblock at the start of the file. |
| 713 | */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 714 | /* calculate the index of the page that contains this bit */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 715 | static inline unsigned long file_page_index(struct bitmap_storage *store, |
| 716 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 717 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 718 | if (store->sb_page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 719 | chunk += sizeof(bitmap_super_t) << 3; |
| 720 | return chunk >> PAGE_BIT_SHIFT; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 721 | } |
| 722 | |
| 723 | /* calculate the (bit) offset of this bit within a page */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 724 | static inline unsigned long file_page_offset(struct bitmap_storage *store, |
| 725 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 726 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 727 | if (store->sb_page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 728 | chunk += sizeof(bitmap_super_t) << 3; |
| 729 | return chunk & (PAGE_BITS - 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /* |
| 733 | * return a pointer to the page in the filemap that contains the given bit |
| 734 | * |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 735 | */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 736 | static inline struct page *filemap_get_page(struct bitmap_storage *store, |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 737 | unsigned long chunk) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 738 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 739 | if (file_page_index(store, chunk) >= store->file_pages) |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 740 | return NULL; |
NeilBrown | f2e06c5 | 2014-05-28 13:39:23 +1000 | [diff] [blame] | 741 | return store->filemap[file_page_index(store, chunk)]; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 742 | } |
| 743 | |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 744 | static int bitmap_storage_alloc(struct bitmap_storage *store, |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 745 | unsigned long chunks, int with_super, |
| 746 | int slot_number) |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 747 | { |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 748 | int pnum, offset = 0; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 749 | unsigned long num_pages; |
| 750 | unsigned long bytes; |
| 751 | |
| 752 | bytes = DIV_ROUND_UP(chunks, 8); |
| 753 | if (with_super) |
| 754 | bytes += sizeof(bitmap_super_t); |
| 755 | |
| 756 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 757 | offset = slot_number * (num_pages - 1); |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 758 | |
| 759 | store->filemap = kmalloc(sizeof(struct page *) |
| 760 | * num_pages, GFP_KERNEL); |
| 761 | if (!store->filemap) |
| 762 | return -ENOMEM; |
| 763 | |
| 764 | if (with_super && !store->sb_page) { |
NeilBrown | d60b479 | 2012-05-22 13:55:25 +1000 | [diff] [blame] | 765 | store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO); |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 766 | if (store->sb_page == NULL) |
| 767 | return -ENOMEM; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 768 | } |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 769 | |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 770 | pnum = 0; |
| 771 | if (store->sb_page) { |
| 772 | store->filemap[0] = store->sb_page; |
| 773 | pnum = 1; |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 774 | store->sb_page->index = offset; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 775 | } |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 776 | |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 777 | for ( ; pnum < num_pages; pnum++) { |
NeilBrown | d60b479 | 2012-05-22 13:55:25 +1000 | [diff] [blame] | 778 | store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 779 | if (!store->filemap[pnum]) { |
| 780 | store->file_pages = pnum; |
| 781 | return -ENOMEM; |
| 782 | } |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 783 | store->filemap[pnum]->index = pnum + offset; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 784 | } |
| 785 | store->file_pages = pnum; |
| 786 | |
| 787 | /* We need 4 bits per page, rounded up to a multiple |
| 788 | * of sizeof(unsigned long) */ |
| 789 | store->filemap_attr = kzalloc( |
| 790 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
| 791 | GFP_KERNEL); |
| 792 | if (!store->filemap_attr) |
| 793 | return -ENOMEM; |
| 794 | |
| 795 | store->bytes = bytes; |
| 796 | |
| 797 | return 0; |
| 798 | } |
| 799 | |
NeilBrown | fae7d32 | 2012-05-22 13:55:21 +1000 | [diff] [blame] | 800 | static void bitmap_file_unmap(struct bitmap_storage *store) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 801 | { |
| 802 | struct page **map, *sb_page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 803 | int pages; |
NeilBrown | fae7d32 | 2012-05-22 13:55:21 +1000 | [diff] [blame] | 804 | struct file *file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 805 | |
NeilBrown | fae7d32 | 2012-05-22 13:55:21 +1000 | [diff] [blame] | 806 | file = store->file; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 807 | map = store->filemap; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 808 | pages = store->file_pages; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 809 | sb_page = store->sb_page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 810 | |
| 811 | while (pages--) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 812 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 813 | free_buffers(map[pages]); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 814 | kfree(map); |
NeilBrown | fae7d32 | 2012-05-22 13:55:21 +1000 | [diff] [blame] | 815 | kfree(store->filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 816 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 817 | if (sb_page) |
| 818 | free_buffers(sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 819 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 820 | if (file) { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 821 | struct inode *inode = file_inode(file); |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 822 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 823 | fput(file); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 824 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 825 | } |
| 826 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 827 | /* |
| 828 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file |
| 829 | * then it is no longer reliable, so we stop using it and we mark the file |
| 830 | * as failed in the superblock |
| 831 | */ |
| 832 | static void bitmap_file_kick(struct bitmap *bitmap) |
| 833 | { |
| 834 | char *path, *ptr = NULL; |
| 835 | |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 836 | if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) { |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 837 | bitmap_update_sb(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 838 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 839 | if (bitmap->storage.file) { |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 840 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 841 | if (path) |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 842 | ptr = d_path(&bitmap->storage.file->f_path, |
| 843 | path, PAGE_SIZE); |
Christoph Hellwig | 6bcfd60 | 2008-05-23 13:04:34 -0700 | [diff] [blame] | 844 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 845 | printk(KERN_ALERT |
| 846 | "%s: kicking failed bitmap file %s from array!\n", |
Christoph Hellwig | 6bcfd60 | 2008-05-23 13:04:34 -0700 | [diff] [blame] | 847 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 848 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 849 | kfree(path); |
| 850 | } else |
| 851 | printk(KERN_ALERT |
| 852 | "%s: disabling internal bitmap due to errors\n", |
| 853 | bmname(bitmap)); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 854 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | enum bitmap_page_attr { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 858 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
NeilBrown | 5a537df | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 859 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
| 860 | * i.e. counter is 1 or 2. */ |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 861 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 862 | }; |
| 863 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 864 | static inline void set_page_attr(struct bitmap *bitmap, int pnum, |
| 865 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 866 | { |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 867 | set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 868 | } |
| 869 | |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 870 | static inline void clear_page_attr(struct bitmap *bitmap, int pnum, |
| 871 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 872 | { |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 873 | clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 874 | } |
| 875 | |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 876 | static inline int test_page_attr(struct bitmap *bitmap, int pnum, |
| 877 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 878 | { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 879 | return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 880 | } |
| 881 | |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 882 | static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum, |
| 883 | enum bitmap_page_attr attr) |
| 884 | { |
| 885 | return test_and_clear_bit((pnum<<2) + attr, |
| 886 | bitmap->storage.filemap_attr); |
| 887 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 888 | /* |
| 889 | * bitmap_file_set_bit -- called before performing a write to the md device |
| 890 | * to set (and eventually sync) a particular bit in the bitmap file |
| 891 | * |
| 892 | * we set the bit immediately, then we record the page number so that |
| 893 | * when an unplug occurs, we can flush the dirty pages out to disk |
| 894 | */ |
| 895 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) |
| 896 | { |
| 897 | unsigned long bit; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 898 | struct page *page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 899 | void *kaddr; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 900 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 901 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 902 | page = filemap_get_page(&bitmap->storage, chunk); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 903 | if (!page) |
| 904 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 905 | bit = file_page_offset(&bitmap->storage, chunk); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 906 | |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 907 | /* set the bit */ |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 908 | kaddr = kmap_atomic(page); |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 909 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 910 | set_bit(bit, kaddr); |
| 911 | else |
Akinobu Mita | 3f810b6 | 2013-04-24 11:42:41 +1000 | [diff] [blame] | 912 | set_bit_le(bit, kaddr); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 913 | kunmap_atomic(kaddr); |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 914 | pr_debug("set file bit %lu page %lu\n", bit, page->index); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 915 | /* record page number so it gets flushed to disk when unplug occurs */ |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 916 | set_page_attr(bitmap, page->index, BITMAP_PAGE_DIRTY); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 917 | } |
| 918 | |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 919 | static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) |
| 920 | { |
| 921 | unsigned long bit; |
| 922 | struct page *page; |
| 923 | void *paddr; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 924 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 925 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 926 | page = filemap_get_page(&bitmap->storage, chunk); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 927 | if (!page) |
| 928 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 929 | bit = file_page_offset(&bitmap->storage, chunk); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 930 | paddr = kmap_atomic(page); |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 931 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 932 | clear_bit(bit, paddr); |
| 933 | else |
Akinobu Mita | 3f810b6 | 2013-04-24 11:42:41 +1000 | [diff] [blame] | 934 | clear_bit_le(bit, paddr); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 935 | kunmap_atomic(paddr); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 936 | if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) { |
| 937 | set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 938 | bitmap->allclean = 0; |
| 939 | } |
| 940 | } |
| 941 | |
Goldwyn Rodrigues | 11dd35d | 2014-06-07 00:36:26 -0500 | [diff] [blame] | 942 | static int bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) |
| 943 | { |
| 944 | unsigned long bit; |
| 945 | struct page *page; |
| 946 | void *paddr; |
| 947 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
| 948 | int set = 0; |
| 949 | |
| 950 | page = filemap_get_page(&bitmap->storage, chunk); |
| 951 | if (!page) |
| 952 | return -EINVAL; |
| 953 | bit = file_page_offset(&bitmap->storage, chunk); |
| 954 | paddr = kmap_atomic(page); |
| 955 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
| 956 | set = test_bit(bit, paddr); |
| 957 | else |
| 958 | set = test_bit_le(bit, paddr); |
| 959 | kunmap_atomic(paddr); |
| 960 | return set; |
| 961 | } |
| 962 | |
| 963 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 964 | /* this gets called when the md device is ready to unplug its underlying |
| 965 | * (slave) device queues -- before we let any writes go down, we need to |
| 966 | * sync the dirty pages of the bitmap file to disk */ |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 967 | void bitmap_unplug(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 968 | { |
NeilBrown | 7466712 | 2012-05-22 13:55:19 +1000 | [diff] [blame] | 969 | unsigned long i; |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 970 | int dirty, need_write; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 971 | |
NeilBrown | 62f82fa | 2012-05-22 13:55:21 +1000 | [diff] [blame] | 972 | if (!bitmap || !bitmap->storage.filemap || |
| 973 | test_bit(BITMAP_STALE, &bitmap->flags)) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 974 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 975 | |
| 976 | /* look at each page to see if there are any set bits that need to be |
| 977 | * flushed out to disk */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 978 | for (i = 0; i < bitmap->storage.file_pages; i++) { |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 979 | if (!bitmap->storage.filemap) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 980 | return; |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 981 | dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
| 982 | need_write = test_and_clear_page_attr(bitmap, i, |
| 983 | BITMAP_PAGE_NEEDWRITE); |
| 984 | if (dirty || need_write) { |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 985 | clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 986 | write_page(bitmap, bitmap->storage.filemap[i], 0); |
| 987 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 988 | } |
NeilBrown | 4b5060d | 2014-09-09 14:13:51 +1000 | [diff] [blame] | 989 | if (bitmap->storage.file) |
| 990 | wait_event(bitmap->write_wait, |
| 991 | atomic_read(&bitmap->pending_writes)==0); |
| 992 | else |
| 993 | md_super_wait(bitmap->mddev); |
| 994 | |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 995 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 996 | bitmap_file_kick(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 997 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 998 | EXPORT_SYMBOL(bitmap_unplug); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 999 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1000 | 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] | 1001 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
| 1002 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the |
| 1003 | * memory mapping of the bitmap file |
| 1004 | * Special cases: |
| 1005 | * if there's no bitmap file, or if the bitmap file had been |
| 1006 | * previously kicked from the array, we mark all the bits as |
| 1007 | * 1's in order to cause a full resync. |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1008 | * |
| 1009 | * We ignore all bits for sectors that end earlier than 'start'. |
| 1010 | * This is used when reading an out-of-date bitmap... |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1011 | */ |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1012 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1013 | { |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 1014 | unsigned long i, chunks, index, oldindex, bit, node_offset = 0; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1015 | struct page *page = NULL; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1016 | unsigned long bit_cnt = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1017 | struct file *file; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1018 | unsigned long offset; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1019 | int outofdate; |
| 1020 | int ret = -ENOSPC; |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1021 | void *paddr; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1022 | struct bitmap_storage *store = &bitmap->storage; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1023 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1024 | chunks = bitmap->counts.chunks; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1025 | file = store->file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1026 | |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1027 | if (!file && !bitmap->mddev->bitmap_info.offset) { |
| 1028 | /* No permanent bitmap - fill with '1s'. */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1029 | store->filemap = NULL; |
| 1030 | store->file_pages = 0; |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1031 | for (i = 0; i < chunks ; i++) { |
| 1032 | /* if the disk bit is set, set the memory bit */ |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1033 | int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1034 | >= start); |
| 1035 | bitmap_set_memory_bits(bitmap, |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1036 | (sector_t)i << bitmap->counts.chunkshift, |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1037 | needed); |
| 1038 | } |
| 1039 | return 0; |
| 1040 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1041 | |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 1042 | outofdate = test_bit(BITMAP_STALE, &bitmap->flags); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1043 | if (outofdate) |
| 1044 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " |
| 1045 | "recovery\n", bmname(bitmap)); |
| 1046 | |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1047 | if (file && i_size_read(file->f_mapping->host) < store->bytes) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1048 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1049 | bmname(bitmap), |
| 1050 | (unsigned long) i_size_read(file->f_mapping->host), |
| 1051 | store->bytes); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1052 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1053 | } |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 1054 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1055 | oldindex = ~0L; |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1056 | offset = 0; |
| 1057 | if (!bitmap->mddev->bitmap_info.external) |
| 1058 | offset = sizeof(bitmap_super_t); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1059 | |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 1060 | if (mddev_is_clustered(bitmap->mddev)) |
| 1061 | node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE)); |
| 1062 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1063 | for (i = 0; i < chunks; i++) { |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1064 | int b; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1065 | index = file_page_index(&bitmap->storage, i); |
| 1066 | bit = file_page_offset(&bitmap->storage, i); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1067 | if (index != oldindex) { /* this is a new page, read it in */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 1068 | int count; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1069 | /* unmap the old page, we're done with it */ |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1070 | if (index == store->file_pages-1) |
| 1071 | count = store->bytes - index * PAGE_SIZE; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 1072 | else |
| 1073 | count = PAGE_SIZE; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1074 | page = store->filemap[index]; |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1075 | if (file) |
| 1076 | ret = read_page(file, index, bitmap, |
| 1077 | count, page); |
| 1078 | else |
| 1079 | ret = read_sb_page( |
| 1080 | bitmap->mddev, |
| 1081 | bitmap->mddev->bitmap_info.offset, |
| 1082 | page, |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 1083 | index + node_offset, count); |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1084 | |
| 1085 | if (ret) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1086 | goto err; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1087 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1088 | oldindex = index; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1089 | |
| 1090 | if (outofdate) { |
| 1091 | /* |
| 1092 | * if bitmap is out of date, dirty the |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1093 | * whole page and write it out |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1094 | */ |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1095 | paddr = kmap_atomic(page); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1096 | memset(paddr + offset, 0xff, |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1097 | PAGE_SIZE - offset); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1098 | kunmap_atomic(paddr); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1099 | write_page(bitmap, page, 1); |
| 1100 | |
| 1101 | ret = -EIO; |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 1102 | if (test_bit(BITMAP_WRITE_ERROR, |
| 1103 | &bitmap->flags)) |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1104 | goto err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1105 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1106 | } |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1107 | paddr = kmap_atomic(page); |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 1108 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1109 | b = test_bit(bit, paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1110 | else |
Akinobu Mita | 6b33aff | 2011-03-23 16:42:13 -0700 | [diff] [blame] | 1111 | b = test_bit_le(bit, paddr); |
Cong Wang | b2f46e6 | 2011-11-28 13:25:44 +0800 | [diff] [blame] | 1112 | kunmap_atomic(paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1113 | if (b) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1114 | /* if the disk bit is set, set the memory bit */ |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1115 | int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1116 | >= start); |
| 1117 | bitmap_set_memory_bits(bitmap, |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1118 | (sector_t)i << bitmap->counts.chunkshift, |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1119 | needed); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1120 | bit_cnt++; |
| 1121 | } |
NeilBrown | 27581e5 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1122 | offset = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1123 | } |
| 1124 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1125 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1126 | "read %lu pages, set %lu of %lu bits\n", |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1127 | bmname(bitmap), store->file_pages, |
NeilBrown | d1244cb | 2012-05-22 13:55:12 +1000 | [diff] [blame] | 1128 | bit_cnt, chunks); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1129 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1130 | return 0; |
| 1131 | |
| 1132 | err: |
| 1133 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", |
| 1134 | bmname(bitmap), ret); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1135 | return ret; |
| 1136 | } |
| 1137 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1138 | void bitmap_write_all(struct bitmap *bitmap) |
| 1139 | { |
| 1140 | /* We don't actually write all bitmap blocks here, |
| 1141 | * just flag them as needing to be written |
| 1142 | */ |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1143 | int i; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1144 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1145 | if (!bitmap || !bitmap->storage.filemap) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1146 | return; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1147 | if (bitmap->storage.file) |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1148 | /* Only one copy, so nothing needed */ |
| 1149 | return; |
| 1150 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1151 | for (i = 0; i < bitmap->storage.file_pages; i++) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1152 | set_page_attr(bitmap, i, |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1153 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1154 | bitmap->allclean = 0; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1155 | } |
| 1156 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1157 | static void bitmap_count_page(struct bitmap_counts *bitmap, |
| 1158 | sector_t offset, int inc) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1159 | { |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1160 | sector_t chunk = offset >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1161 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1162 | bitmap->bp[page].count += inc; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1163 | bitmap_checkfree(bitmap, page); |
| 1164 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1165 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1166 | static void bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset) |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1167 | { |
| 1168 | sector_t chunk = offset >> bitmap->chunkshift; |
| 1169 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1170 | struct bitmap_page *bp = &bitmap->bp[page]; |
| 1171 | |
| 1172 | if (!bp->pending) |
| 1173 | bp->pending = 1; |
| 1174 | } |
| 1175 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1176 | static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1177 | sector_t offset, sector_t *blocks, |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1178 | int create); |
| 1179 | |
| 1180 | /* |
| 1181 | * bitmap daemon -- periodically wakes up to clean bits and flush pages |
| 1182 | * out to disk |
| 1183 | */ |
| 1184 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1185 | void bitmap_daemon_work(struct mddev *mddev) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1186 | { |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1187 | struct bitmap *bitmap; |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1188 | unsigned long j; |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1189 | unsigned long nextpage; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1190 | sector_t blocks; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1191 | struct bitmap_counts *counts; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1192 | |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1193 | /* Use a mutex to guard daemon_work against |
| 1194 | * bitmap_destroy. |
| 1195 | */ |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1196 | mutex_lock(&mddev->bitmap_info.mutex); |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1197 | bitmap = mddev->bitmap; |
| 1198 | if (bitmap == NULL) { |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1199 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1200 | return; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1201 | } |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1202 | if (time_before(jiffies, bitmap->daemon_lastrun |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1203 | + mddev->bitmap_info.daemon_sleep)) |
NeilBrown | 7be3dfe | 2008-03-10 11:43:48 -0700 | [diff] [blame] | 1204 | goto done; |
| 1205 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1206 | bitmap->daemon_lastrun = jiffies; |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1207 | if (bitmap->allclean) { |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1208 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1209 | goto done; |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1210 | } |
| 1211 | bitmap->allclean = 1; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1212 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1213 | /* Any file-page which is PENDING now needs to be written. |
| 1214 | * So set NEEDWRITE now, then after we make any last-minute changes |
| 1215 | * we will write it. |
| 1216 | */ |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1217 | for (j = 0; j < bitmap->storage.file_pages; j++) |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 1218 | if (test_and_clear_page_attr(bitmap, j, |
| 1219 | BITMAP_PAGE_PENDING)) |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1220 | set_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1221 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1222 | |
| 1223 | if (bitmap->need_sync && |
| 1224 | mddev->bitmap_info.external == 0) { |
| 1225 | /* Arrange for superblock update as well as |
| 1226 | * other changes */ |
| 1227 | bitmap_super_t *sb; |
| 1228 | bitmap->need_sync = 0; |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1229 | if (bitmap->storage.filemap) { |
| 1230 | sb = kmap_atomic(bitmap->storage.sb_page); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1231 | sb->events_cleared = |
| 1232 | cpu_to_le64(bitmap->events_cleared); |
| 1233 | kunmap_atomic(sb); |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1234 | set_page_attr(bitmap, 0, |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1235 | BITMAP_PAGE_NEEDWRITE); |
| 1236 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1237 | } |
| 1238 | /* Now look at the bitmap counters and if any are '2' or '1', |
| 1239 | * decrement and handle accordingly. |
| 1240 | */ |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1241 | counts = &bitmap->counts; |
| 1242 | spin_lock_irq(&counts->lock); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1243 | nextpage = 0; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1244 | for (j = 0; j < counts->chunks; j++) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1245 | bitmap_counter_t *bmc; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1246 | sector_t block = (sector_t)j << counts->chunkshift; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1247 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1248 | if (j == nextpage) { |
| 1249 | nextpage += PAGE_COUNTER_RATIO; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1250 | if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) { |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1251 | j |= PAGE_COUNTER_MASK; |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1252 | continue; |
| 1253 | } |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1254 | counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1255 | } |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1256 | bmc = bitmap_get_counter(counts, |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1257 | block, |
NeilBrown | db305e5 | 2009-05-07 12:49:06 +1000 | [diff] [blame] | 1258 | &blocks, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1259 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1260 | if (!bmc) { |
| 1261 | j |= PAGE_COUNTER_MASK; |
| 1262 | continue; |
| 1263 | } |
| 1264 | if (*bmc == 1 && !bitmap->need_sync) { |
| 1265 | /* We can clear the bit */ |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1266 | *bmc = 0; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1267 | bitmap_count_page(counts, block, -1); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1268 | bitmap_file_clear_bit(bitmap, block); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1269 | } else if (*bmc && *bmc <= 2) { |
| 1270 | *bmc = 1; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1271 | bitmap_set_pending(counts, block); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1272 | bitmap->allclean = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1273 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1274 | } |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1275 | spin_unlock_irq(&counts->lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1276 | |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1277 | /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. |
| 1278 | * DIRTY pages need to be written by bitmap_unplug so it can wait |
| 1279 | * for them. |
| 1280 | * If we find any DIRTY page we stop there and let bitmap_unplug |
| 1281 | * handle all the rest. This is important in the case where |
| 1282 | * the first blocking holds the superblock and it has been updated. |
| 1283 | * We mustn't write any other blocks before the superblock. |
| 1284 | */ |
NeilBrown | 62f82fa | 2012-05-22 13:55:21 +1000 | [diff] [blame] | 1285 | for (j = 0; |
| 1286 | j < bitmap->storage.file_pages |
| 1287 | && !test_bit(BITMAP_STALE, &bitmap->flags); |
| 1288 | j++) { |
NeilBrown | d189122 | 2012-05-22 13:55:09 +1000 | [diff] [blame] | 1289 | if (test_page_attr(bitmap, j, |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1290 | BITMAP_PAGE_DIRTY)) |
| 1291 | /* bitmap_unplug will handle the rest */ |
| 1292 | break; |
NeilBrown | bdfd114 | 2012-05-22 13:55:22 +1000 | [diff] [blame] | 1293 | if (test_and_clear_page_attr(bitmap, j, |
| 1294 | BITMAP_PAGE_NEEDWRITE)) { |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1295 | write_page(bitmap, bitmap->storage.filemap[j], 0); |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1296 | } |
| 1297 | } |
NeilBrown | bf07bb7 | 2012-05-22 13:55:06 +1000 | [diff] [blame] | 1298 | |
NeilBrown | 7be3dfe | 2008-03-10 11:43:48 -0700 | [diff] [blame] | 1299 | done: |
NeilBrown | 8311c29 | 2008-03-04 14:29:30 -0800 | [diff] [blame] | 1300 | if (bitmap->allclean == 0) |
NeilBrown | 2e61ebb | 2011-12-23 10:17:50 +1100 | [diff] [blame] | 1301 | mddev->thread->timeout = |
| 1302 | mddev->bitmap_info.daemon_sleep; |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1303 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1304 | } |
| 1305 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1306 | static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1307 | sector_t offset, sector_t *blocks, |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1308 | int create) |
NeilBrown | ee305ac | 2009-09-23 18:06:44 +1000 | [diff] [blame] | 1309 | __releases(bitmap->lock) |
| 1310 | __acquires(bitmap->lock) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1311 | { |
| 1312 | /* If 'create', we might release the lock and reclaim it. |
| 1313 | * The lock must have been taken with interrupts enabled. |
| 1314 | * If !create, we don't release the lock. |
| 1315 | */ |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1316 | sector_t chunk = offset >> bitmap->chunkshift; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1317 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1318 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; |
| 1319 | sector_t csize; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1320 | int err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1321 | |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1322 | err = bitmap_checkpage(bitmap, page, create); |
| 1323 | |
| 1324 | if (bitmap->bp[page].hijacked || |
| 1325 | bitmap->bp[page].map == NULL) |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1326 | csize = ((sector_t)1) << (bitmap->chunkshift + |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1327 | PAGE_COUNTER_SHIFT - 1); |
| 1328 | else |
NeilBrown | 61a0d80 | 2012-03-19 12:46:41 +1100 | [diff] [blame] | 1329 | csize = ((sector_t)1) << bitmap->chunkshift; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1330 | *blocks = csize - (offset & (csize - 1)); |
| 1331 | |
| 1332 | if (err < 0) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1333 | return NULL; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1334 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1335 | /* now locked ... */ |
| 1336 | |
| 1337 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ |
| 1338 | /* should we use the first or second counter field |
| 1339 | * of the hijacked pointer? */ |
| 1340 | int hi = (pageoff > PAGE_COUNTER_MASK); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1341 | return &((bitmap_counter_t *) |
| 1342 | &bitmap->bp[page].map)[hi]; |
NeilBrown | ef42567 | 2010-06-01 19:37:33 +1000 | [diff] [blame] | 1343 | } else /* page is allocated */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1344 | return (bitmap_counter_t *) |
| 1345 | &(bitmap->bp[page].map[pageoff]); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1346 | } |
| 1347 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1348 | 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] | 1349 | { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1350 | if (!bitmap) |
| 1351 | return 0; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1352 | |
| 1353 | if (behind) { |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 1354 | int bw; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1355 | atomic_inc(&bitmap->behind_writes); |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 1356 | bw = atomic_read(&bitmap->behind_writes); |
| 1357 | if (bw > bitmap->behind_writes_used) |
| 1358 | bitmap->behind_writes_used = bw; |
| 1359 | |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 1360 | pr_debug("inc write-behind count %d/%lu\n", |
| 1361 | bw, bitmap->mddev->bitmap_info.max_write_behind); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1362 | } |
| 1363 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1364 | while (sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1365 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1366 | bitmap_counter_t *bmc; |
| 1367 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1368 | spin_lock_irq(&bitmap->counts.lock); |
| 1369 | bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1370 | if (!bmc) { |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1371 | spin_unlock_irq(&bitmap->counts.lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1372 | return 0; |
| 1373 | } |
| 1374 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1375 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1376 | DEFINE_WAIT(__wait); |
| 1377 | /* note that it is safe to do the prepare_to_wait |
| 1378 | * after the test as long as we do it before dropping |
| 1379 | * the spinlock. |
| 1380 | */ |
| 1381 | prepare_to_wait(&bitmap->overflow_wait, &__wait, |
| 1382 | TASK_UNINTERRUPTIBLE); |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1383 | spin_unlock_irq(&bitmap->counts.lock); |
NeilBrown | f54a9d0 | 2012-08-02 08:33:20 +1000 | [diff] [blame] | 1384 | schedule(); |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1385 | finish_wait(&bitmap->overflow_wait, &__wait); |
| 1386 | continue; |
| 1387 | } |
| 1388 | |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1389 | switch (*bmc) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1390 | case 0: |
| 1391 | bitmap_file_set_bit(bitmap, offset); |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1392 | bitmap_count_page(&bitmap->counts, offset, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1393 | /* fall through */ |
| 1394 | case 1: |
| 1395 | *bmc = 2; |
| 1396 | } |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1397 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1398 | (*bmc)++; |
| 1399 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1400 | spin_unlock_irq(&bitmap->counts.lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1401 | |
| 1402 | offset += blocks; |
| 1403 | if (sectors > blocks) |
| 1404 | sectors -= blocks; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1405 | else |
| 1406 | sectors = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1407 | } |
| 1408 | return 0; |
| 1409 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1410 | EXPORT_SYMBOL(bitmap_startwrite); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1411 | |
| 1412 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1413 | int success, int behind) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1414 | { |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1415 | if (!bitmap) |
| 1416 | return; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1417 | if (behind) { |
NeilBrown | e555190 | 2010-03-31 11:21:44 +1100 | [diff] [blame] | 1418 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
| 1419 | wake_up(&bitmap->behind_wait); |
NeilBrown | 36a4e1f | 2011-10-07 14:23:17 +1100 | [diff] [blame] | 1420 | pr_debug("dec write-behind count %d/%lu\n", |
| 1421 | atomic_read(&bitmap->behind_writes), |
| 1422 | bitmap->mddev->bitmap_info.max_write_behind); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1423 | } |
| 1424 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1425 | while (sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1426 | sector_t blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1427 | unsigned long flags; |
| 1428 | bitmap_counter_t *bmc; |
| 1429 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1430 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
| 1431 | bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1432 | if (!bmc) { |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1433 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1434 | return; |
| 1435 | } |
| 1436 | |
NeilBrown | 961902c | 2011-12-23 09:57:48 +1100 | [diff] [blame] | 1437 | if (success && !bitmap->mddev->degraded && |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 1438 | bitmap->events_cleared < bitmap->mddev->events) { |
| 1439 | bitmap->events_cleared = bitmap->mddev->events; |
| 1440 | bitmap->need_sync = 1; |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1441 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
Neil Brown | a0da84f | 2008-06-28 08:31:22 +1000 | [diff] [blame] | 1442 | } |
| 1443 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1444 | if (!success && !NEEDED(*bmc)) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1445 | *bmc |= NEEDED_MASK; |
| 1446 | |
Namhyung Kim | 27d5ea0 | 2011-06-09 11:42:57 +1000 | [diff] [blame] | 1447 | if (COUNTER(*bmc) == COUNTER_MAX) |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1448 | wake_up(&bitmap->overflow_wait); |
| 1449 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1450 | (*bmc)--; |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1451 | if (*bmc <= 2) { |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1452 | bitmap_set_pending(&bitmap->counts, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1453 | bitmap->allclean = 0; |
| 1454 | } |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1455 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1456 | offset += blocks; |
| 1457 | if (sectors > blocks) |
| 1458 | sectors -= blocks; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1459 | else |
| 1460 | sectors = 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1461 | } |
| 1462 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1463 | EXPORT_SYMBOL(bitmap_endwrite); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1464 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1465 | 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] | 1466 | int degraded) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1467 | { |
| 1468 | bitmap_counter_t *bmc; |
| 1469 | int rv; |
| 1470 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ |
| 1471 | *blocks = 1024; |
| 1472 | return 1; /* always resync if no bitmap */ |
| 1473 | } |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1474 | spin_lock_irq(&bitmap->counts.lock); |
| 1475 | bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1476 | rv = 0; |
| 1477 | if (bmc) { |
| 1478 | /* locked */ |
| 1479 | if (RESYNC(*bmc)) |
| 1480 | rv = 1; |
| 1481 | else if (NEEDED(*bmc)) { |
| 1482 | rv = 1; |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1483 | if (!degraded) { /* don't set/clear bits if degraded */ |
| 1484 | *bmc |= RESYNC_MASK; |
| 1485 | *bmc &= ~NEEDED_MASK; |
| 1486 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1487 | } |
| 1488 | } |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1489 | spin_unlock_irq(&bitmap->counts.lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1490 | return rv; |
| 1491 | } |
| 1492 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1493 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1494 | int degraded) |
| 1495 | { |
| 1496 | /* bitmap_start_sync must always report on multiples of whole |
| 1497 | * pages, otherwise resync (which is very PAGE_SIZE based) will |
| 1498 | * get confused. |
| 1499 | * So call __bitmap_start_sync repeatedly (if needed) until |
| 1500 | * At least PAGE_SIZE>>9 blocks are covered. |
| 1501 | * Return the 'or' of the result. |
| 1502 | */ |
| 1503 | int rv = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1504 | sector_t blocks1; |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1505 | |
| 1506 | *blocks = 0; |
| 1507 | while (*blocks < (PAGE_SIZE>>9)) { |
| 1508 | rv |= __bitmap_start_sync(bitmap, offset, |
| 1509 | &blocks1, degraded); |
| 1510 | offset += blocks1; |
| 1511 | *blocks += blocks1; |
| 1512 | } |
| 1513 | return rv; |
| 1514 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1515 | EXPORT_SYMBOL(bitmap_start_sync); |
NeilBrown | 1187cf0 | 2009-03-31 14:27:02 +1100 | [diff] [blame] | 1516 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1517 | 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] | 1518 | { |
| 1519 | bitmap_counter_t *bmc; |
| 1520 | unsigned long flags; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1521 | |
| 1522 | if (bitmap == NULL) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1523 | *blocks = 1024; |
| 1524 | return; |
| 1525 | } |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1526 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
| 1527 | bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1528 | if (bmc == NULL) |
| 1529 | goto unlock; |
| 1530 | /* locked */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1531 | if (RESYNC(*bmc)) { |
| 1532 | *bmc &= ~RESYNC_MASK; |
| 1533 | |
| 1534 | if (!NEEDED(*bmc) && aborted) |
| 1535 | *bmc |= NEEDED_MASK; |
| 1536 | else { |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1537 | if (*bmc <= 2) { |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1538 | bitmap_set_pending(&bitmap->counts, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1539 | bitmap->allclean = 0; |
| 1540 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1541 | } |
| 1542 | } |
| 1543 | unlock: |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1544 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1545 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1546 | EXPORT_SYMBOL(bitmap_end_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1547 | |
| 1548 | void bitmap_close_sync(struct bitmap *bitmap) |
| 1549 | { |
| 1550 | /* Sync has finished, and any bitmap chunks that weren't synced |
| 1551 | * properly have been aborted. It remains to us to clear the |
| 1552 | * RESYNC bit wherever it is still on |
| 1553 | */ |
| 1554 | sector_t sector = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1555 | sector_t blocks; |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1556 | if (!bitmap) |
| 1557 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1558 | while (sector < bitmap->mddev->resync_max_sectors) { |
| 1559 | bitmap_end_sync(bitmap, sector, &blocks, 0); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1560 | sector += blocks; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1561 | } |
| 1562 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1563 | EXPORT_SYMBOL(bitmap_close_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1564 | |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1565 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) |
| 1566 | { |
| 1567 | sector_t s = 0; |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1568 | sector_t blocks; |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1569 | |
| 1570 | if (!bitmap) |
| 1571 | return; |
| 1572 | if (sector == 0) { |
| 1573 | bitmap->last_end_sync = jiffies; |
| 1574 | return; |
| 1575 | } |
| 1576 | if (time_before(jiffies, (bitmap->last_end_sync |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1577 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1578 | return; |
| 1579 | wait_event(bitmap->mddev->recovery_wait, |
| 1580 | atomic_read(&bitmap->mddev->recovery_active) == 0); |
| 1581 | |
NeilBrown | 75d3da4 | 2011-01-14 09:14:34 +1100 | [diff] [blame] | 1582 | bitmap->mddev->curr_resync_completed = sector; |
NeilBrown | 070dc6d | 2010-08-30 17:33:34 +1000 | [diff] [blame] | 1583 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1584 | sector &= ~((1ULL << bitmap->counts.chunkshift) - 1); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1585 | s = 0; |
| 1586 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { |
| 1587 | bitmap_end_sync(bitmap, s, &blocks, 0); |
| 1588 | s += blocks; |
| 1589 | } |
| 1590 | bitmap->last_end_sync = jiffies; |
NeilBrown | acb180b | 2009-04-14 16:28:34 +1000 | [diff] [blame] | 1591 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1592 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1593 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
NeilBrown | b47490c | 2008-02-06 01:39:50 -0800 | [diff] [blame] | 1594 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1595 | 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] | 1596 | { |
| 1597 | /* For each chunk covered by any of these sectors, set the |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1598 | * counter to 2 and possibly set resync_needed. They should all |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1599 | * be 0 at this point |
| 1600 | */ |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1601 | |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1602 | sector_t secs; |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1603 | bitmap_counter_t *bmc; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1604 | spin_lock_irq(&bitmap->counts.lock); |
| 1605 | bmc = bitmap_get_counter(&bitmap->counts, offset, &secs, 1); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1606 | if (!bmc) { |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1607 | spin_unlock_irq(&bitmap->counts.lock); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1608 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1609 | } |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 1610 | if (!*bmc) { |
Goldwyn Rodrigues | 11dd35d | 2014-06-07 00:36:26 -0500 | [diff] [blame] | 1611 | *bmc = 2; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1612 | bitmap_count_page(&bitmap->counts, offset, 1); |
| 1613 | bitmap_set_pending(&bitmap->counts, offset); |
NeilBrown | 2585f3e | 2011-09-21 15:37:46 +1000 | [diff] [blame] | 1614 | bitmap->allclean = 0; |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1615 | } |
Goldwyn Rodrigues | 11dd35d | 2014-06-07 00:36:26 -0500 | [diff] [blame] | 1616 | if (needed) |
| 1617 | *bmc |= NEEDED_MASK; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1618 | spin_unlock_irq(&bitmap->counts.lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1619 | } |
| 1620 | |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1621 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
| 1622 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) |
| 1623 | { |
| 1624 | unsigned long chunk; |
| 1625 | |
| 1626 | for (chunk = s; chunk <= e; chunk++) { |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1627 | sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift; |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1628 | bitmap_set_memory_bits(bitmap, sec, 1); |
| 1629 | bitmap_file_set_bit(bitmap, sec); |
NeilBrown | ffa2332 | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1630 | if (sec < bitmap->mddev->recovery_cp) |
| 1631 | /* We are asserting that the array is dirty, |
| 1632 | * so move the recovery_cp address back so |
| 1633 | * that it is obvious that it is dirty |
| 1634 | */ |
| 1635 | bitmap->mddev->recovery_cp = sec; |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1636 | } |
| 1637 | } |
| 1638 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1639 | /* |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1640 | * flush out any pending updates |
| 1641 | */ |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1642 | void bitmap_flush(struct mddev *mddev) |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1643 | { |
| 1644 | struct bitmap *bitmap = mddev->bitmap; |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1645 | long sleep; |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1646 | |
| 1647 | if (!bitmap) /* there was no bitmap */ |
| 1648 | return; |
| 1649 | |
| 1650 | /* run the daemon_work three time to ensure everything is flushed |
| 1651 | * that can be |
| 1652 | */ |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1653 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1654 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1655 | bitmap_daemon_work(mddev); |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1656 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1657 | bitmap_daemon_work(mddev); |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1658 | bitmap->daemon_lastrun -= sleep; |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1659 | bitmap_daemon_work(mddev); |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1660 | bitmap_update_sb(bitmap); |
| 1661 | } |
| 1662 | |
| 1663 | /* |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1664 | * free memory that was allocated |
| 1665 | */ |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1666 | static void bitmap_free(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1667 | { |
| 1668 | unsigned long k, pages; |
| 1669 | struct bitmap_page *bp; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1670 | |
| 1671 | if (!bitmap) /* there was no bitmap */ |
| 1672 | return; |
| 1673 | |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 1674 | if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info && |
| 1675 | bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev)) |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 1676 | md_cluster_stop(bitmap->mddev); |
| 1677 | |
NeilBrown | fae7d32 | 2012-05-22 13:55:21 +1000 | [diff] [blame] | 1678 | /* Shouldn't be needed - but just in case.... */ |
| 1679 | wait_event(bitmap->write_wait, |
| 1680 | atomic_read(&bitmap->pending_writes) == 0); |
| 1681 | |
| 1682 | /* release the bitmap file */ |
| 1683 | bitmap_file_unmap(&bitmap->storage); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1684 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1685 | bp = bitmap->counts.bp; |
| 1686 | pages = bitmap->counts.pages; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1687 | |
| 1688 | /* free all allocated memory */ |
| 1689 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1690 | if (bp) /* deallocate the page memory */ |
| 1691 | for (k = 0; k < pages; k++) |
| 1692 | if (bp[k].map && !bp[k].hijacked) |
| 1693 | kfree(bp[k].map); |
| 1694 | kfree(bp); |
| 1695 | kfree(bitmap); |
| 1696 | } |
NeilBrown | aa5cbd1 | 2009-12-14 12:49:46 +1100 | [diff] [blame] | 1697 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1698 | void bitmap_destroy(struct mddev *mddev) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1699 | { |
| 1700 | struct bitmap *bitmap = mddev->bitmap; |
| 1701 | |
| 1702 | if (!bitmap) /* there was no bitmap */ |
| 1703 | return; |
| 1704 | |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1705 | mutex_lock(&mddev->bitmap_info.mutex); |
NeilBrown | 978a7a4 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 1706 | spin_lock(&mddev->lock); |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1707 | mddev->bitmap = NULL; /* disconnect from the md device */ |
NeilBrown | 978a7a4 | 2014-12-15 12:56:58 +1100 | [diff] [blame] | 1708 | spin_unlock(&mddev->lock); |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1709 | mutex_unlock(&mddev->bitmap_info.mutex); |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1710 | if (mddev->thread) |
| 1711 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1712 | |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1713 | if (bitmap->sysfs_can_clear) |
| 1714 | sysfs_put(bitmap->sysfs_can_clear); |
| 1715 | |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1716 | bitmap_free(bitmap); |
| 1717 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1718 | |
| 1719 | /* |
| 1720 | * initialize the bitmap structure |
| 1721 | * if this returns an error, bitmap_destroy must be called to do clean up |
| 1722 | */ |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 1723 | struct bitmap *bitmap_create(struct mddev *mddev, int slot) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1724 | { |
| 1725 | struct bitmap *bitmap; |
NeilBrown | 1f59390 | 2009-04-20 11:50:24 +1000 | [diff] [blame] | 1726 | sector_t blocks = mddev->resync_max_sectors; |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1727 | struct file *file = mddev->bitmap_info.file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1728 | int err; |
Tejun Heo | 324a56e | 2013-12-11 14:11:53 -0500 | [diff] [blame] | 1729 | struct kernfs_node *bm = NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1730 | |
Alexey Dobriyan | 5f6e3c83 | 2006-10-11 01:22:26 -0700 | [diff] [blame] | 1731 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1732 | |
NeilBrown | c3d9714 | 2009-12-14 12:49:52 +1100 | [diff] [blame] | 1733 | BUG_ON(file && mddev->bitmap_info.offset); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1734 | |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1735 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1736 | if (!bitmap) |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 1737 | return ERR_PTR(-ENOMEM); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1738 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1739 | spin_lock_init(&bitmap->counts.lock); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1740 | atomic_set(&bitmap->pending_writes, 0); |
| 1741 | init_waitqueue_head(&bitmap->write_wait); |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1742 | init_waitqueue_head(&bitmap->overflow_wait); |
NeilBrown | e555190 | 2010-03-31 11:21:44 +1100 | [diff] [blame] | 1743 | init_waitqueue_head(&bitmap->behind_wait); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1744 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1745 | bitmap->mddev = mddev; |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 1746 | bitmap->cluster_slot = slot; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1747 | |
NeilBrown | 5ff5aff | 2010-06-01 19:37:32 +1000 | [diff] [blame] | 1748 | if (mddev->kobj.sd) |
Tejun Heo | 388975c | 2013-09-11 23:19:13 -0400 | [diff] [blame] | 1749 | bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap"); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1750 | if (bm) { |
Tejun Heo | 388975c | 2013-09-11 23:19:13 -0400 | [diff] [blame] | 1751 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear"); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1752 | sysfs_put(bm); |
| 1753 | } else |
| 1754 | bitmap->sysfs_can_clear = NULL; |
| 1755 | |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1756 | bitmap->storage.file = file; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1757 | if (file) { |
| 1758 | get_file(file); |
NeilBrown | ae8fa28 | 2009-10-16 15:56:01 +1100 | [diff] [blame] | 1759 | /* As future accesses to this file will use bmap, |
| 1760 | * and bypass the page cache, we must sync the file |
| 1761 | * first. |
| 1762 | */ |
Christoph Hellwig | 8018ab0 | 2010-03-22 17:32:25 +0100 | [diff] [blame] | 1763 | vfs_fsync(file, 1); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1764 | } |
NeilBrown | 42a04b5 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1765 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
Jonathan Brassow | 9c81075 | 2011-06-08 17:59:30 -0500 | [diff] [blame] | 1766 | if (!mddev->bitmap_info.external) { |
| 1767 | /* |
| 1768 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is |
| 1769 | * instructing us to create a new on-disk bitmap instance. |
| 1770 | */ |
| 1771 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) |
| 1772 | err = bitmap_new_disk_sb(bitmap); |
| 1773 | else |
| 1774 | err = bitmap_read_sb(bitmap); |
| 1775 | } else { |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1776 | err = 0; |
| 1777 | if (mddev->bitmap_info.chunksize == 0 || |
| 1778 | mddev->bitmap_info.daemon_sleep == 0) |
| 1779 | /* chunksize and time_base need to be |
| 1780 | * set first. */ |
| 1781 | err = -EINVAL; |
| 1782 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1783 | if (err) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1784 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1785 | |
NeilBrown | 624ce4f | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 1786 | bitmap->daemon_lastrun = jiffies; |
NeilBrown | d60b479 | 2012-05-22 13:55:25 +1000 | [diff] [blame] | 1787 | err = bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1); |
| 1788 | if (err) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1789 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1790 | |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1791 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
NeilBrown | d60b479 | 2012-05-22 13:55:25 +1000 | [diff] [blame] | 1792 | bitmap->counts.pages, bmname(bitmap)); |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1793 | |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 1794 | err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0; |
| 1795 | if (err) |
| 1796 | goto error; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1797 | |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 1798 | return bitmap; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1799 | error: |
| 1800 | bitmap_free(bitmap); |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 1801 | return ERR_PTR(err); |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1802 | } |
| 1803 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 1804 | int bitmap_load(struct mddev *mddev) |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1805 | { |
| 1806 | int err = 0; |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1807 | sector_t start = 0; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1808 | sector_t sector = 0; |
| 1809 | struct bitmap *bitmap = mddev->bitmap; |
| 1810 | |
| 1811 | if (!bitmap) |
| 1812 | goto out; |
| 1813 | |
| 1814 | /* Clear out old bitmap info first: Either there is none, or we |
| 1815 | * are resuming after someone else has possibly changed things, |
| 1816 | * so we should forget old cached info. |
| 1817 | * All chunks should be clean, but some might need_sync. |
| 1818 | */ |
| 1819 | while (sector < mddev->resync_max_sectors) { |
NeilBrown | 57dab0b | 2010-10-19 10:03:39 +1100 | [diff] [blame] | 1820 | sector_t blocks; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1821 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
| 1822 | sector += blocks; |
| 1823 | } |
| 1824 | bitmap_close_sync(bitmap); |
| 1825 | |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1826 | if (mddev->degraded == 0 |
| 1827 | || bitmap->events_cleared == mddev->events) |
| 1828 | /* no need to keep dirty bits to optimise a |
| 1829 | * re-add of a missing device */ |
| 1830 | start = mddev->recovery_cp; |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1831 | |
NeilBrown | afbaa90 | 2012-04-12 16:05:06 +1000 | [diff] [blame] | 1832 | mutex_lock(&mddev->bitmap_info.mutex); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1833 | err = bitmap_init_from_disk(bitmap, start); |
NeilBrown | afbaa90 | 2012-04-12 16:05:06 +1000 | [diff] [blame] | 1834 | mutex_unlock(&mddev->bitmap_info.mutex); |
Jonathan Brassow | 3520fa4 | 2011-07-27 11:00:37 +1000 | [diff] [blame] | 1835 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1836 | if (err) |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1837 | goto out; |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 1838 | clear_bit(BITMAP_STALE, &bitmap->flags); |
NeilBrown | ef99bf4 | 2012-05-22 13:55:08 +1000 | [diff] [blame] | 1839 | |
| 1840 | /* Kick recovery in case any bits were set */ |
| 1841 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1842 | |
NeilBrown | 1b04be9 | 2009-12-14 12:49:53 +1100 | [diff] [blame] | 1843 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
NeilBrown | 9cd30fd | 2009-12-14 12:49:54 +1100 | [diff] [blame] | 1844 | md_wakeup_thread(mddev->thread); |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1845 | |
NeilBrown | 4ad1366 | 2007-07-17 04:06:13 -0700 | [diff] [blame] | 1846 | bitmap_update_sb(bitmap); |
| 1847 | |
NeilBrown | b405fe9 | 2012-05-22 13:55:15 +1000 | [diff] [blame] | 1848 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1849 | err = -EIO; |
| 1850 | out: |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1851 | return err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1852 | } |
NeilBrown | 69e51b4 | 2010-06-01 19:37:35 +1000 | [diff] [blame] | 1853 | EXPORT_SYMBOL_GPL(bitmap_load); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1854 | |
Goldwyn Rodrigues | 11dd35d | 2014-06-07 00:36:26 -0500 | [diff] [blame] | 1855 | /* Loads the bitmap associated with slot and copies the resync information |
| 1856 | * to our bitmap |
| 1857 | */ |
| 1858 | int bitmap_copy_from_slot(struct mddev *mddev, int slot, |
Goldwyn Rodrigues | 97f6cd3 | 2015-04-14 10:45:42 -0500 | [diff] [blame] | 1859 | sector_t *low, sector_t *high, bool clear_bits) |
Goldwyn Rodrigues | 11dd35d | 2014-06-07 00:36:26 -0500 | [diff] [blame] | 1860 | { |
| 1861 | int rv = 0, i, j; |
| 1862 | sector_t block, lo = 0, hi = 0; |
| 1863 | struct bitmap_counts *counts; |
| 1864 | struct bitmap *bitmap = bitmap_create(mddev, slot); |
| 1865 | |
| 1866 | if (IS_ERR(bitmap)) |
| 1867 | return PTR_ERR(bitmap); |
| 1868 | |
| 1869 | rv = bitmap_read_sb(bitmap); |
| 1870 | if (rv) |
| 1871 | goto err; |
| 1872 | |
| 1873 | rv = bitmap_init_from_disk(bitmap, 0); |
| 1874 | if (rv) |
| 1875 | goto err; |
| 1876 | |
| 1877 | counts = &bitmap->counts; |
| 1878 | for (j = 0; j < counts->chunks; j++) { |
| 1879 | block = (sector_t)j << counts->chunkshift; |
| 1880 | if (bitmap_file_test_bit(bitmap, block)) { |
| 1881 | if (!lo) |
| 1882 | lo = block; |
| 1883 | hi = block; |
| 1884 | bitmap_file_clear_bit(bitmap, block); |
| 1885 | bitmap_set_memory_bits(mddev->bitmap, block, 1); |
| 1886 | bitmap_file_set_bit(mddev->bitmap, block); |
| 1887 | } |
| 1888 | } |
| 1889 | |
Goldwyn Rodrigues | 97f6cd3 | 2015-04-14 10:45:42 -0500 | [diff] [blame] | 1890 | if (clear_bits) { |
| 1891 | bitmap_update_sb(bitmap); |
| 1892 | /* Setting this for the ev_page should be enough. |
| 1893 | * And we do not require both write_all and PAGE_DIRT either |
| 1894 | */ |
| 1895 | for (i = 0; i < bitmap->storage.file_pages; i++) |
| 1896 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
| 1897 | bitmap_write_all(bitmap); |
| 1898 | bitmap_unplug(bitmap); |
| 1899 | } |
Goldwyn Rodrigues | 11dd35d | 2014-06-07 00:36:26 -0500 | [diff] [blame] | 1900 | *low = lo; |
| 1901 | *high = hi; |
| 1902 | err: |
| 1903 | bitmap_free(bitmap); |
| 1904 | return rv; |
| 1905 | } |
| 1906 | EXPORT_SYMBOL_GPL(bitmap_copy_from_slot); |
| 1907 | |
| 1908 | |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1909 | void bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
| 1910 | { |
| 1911 | unsigned long chunk_kb; |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1912 | struct bitmap_counts *counts; |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1913 | |
| 1914 | if (!bitmap) |
| 1915 | return; |
| 1916 | |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1917 | counts = &bitmap->counts; |
| 1918 | |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1919 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; |
| 1920 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
| 1921 | "%lu%s chunk", |
NeilBrown | 40cffcc | 2012-05-22 13:55:24 +1000 | [diff] [blame] | 1922 | counts->pages - counts->missing_pages, |
| 1923 | counts->pages, |
| 1924 | (counts->pages - counts->missing_pages) |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1925 | << (PAGE_SHIFT - 10), |
| 1926 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, |
| 1927 | chunk_kb ? "KB" : "B"); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1928 | if (bitmap->storage.file) { |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1929 | seq_printf(seq, ", file: "); |
NeilBrown | 1ec885c | 2012-05-22 13:55:10 +1000 | [diff] [blame] | 1930 | seq_path(seq, &bitmap->storage.file->f_path, " \t\n"); |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1931 | } |
| 1932 | |
| 1933 | seq_printf(seq, "\n"); |
NeilBrown | 5714896 | 2012-03-19 12:46:40 +1100 | [diff] [blame] | 1934 | } |
| 1935 | |
NeilBrown | d60b479 | 2012-05-22 13:55:25 +1000 | [diff] [blame] | 1936 | int bitmap_resize(struct bitmap *bitmap, sector_t blocks, |
| 1937 | int chunksize, int init) |
| 1938 | { |
| 1939 | /* If chunk_size is 0, choose an appropriate chunk size. |
| 1940 | * Then possibly allocate new storage space. |
| 1941 | * Then quiesce, copy bits, replace bitmap, and re-start |
| 1942 | * |
| 1943 | * This function is called both to set up the initial bitmap |
| 1944 | * and to resize the bitmap while the array is active. |
| 1945 | * If this happens as a result of the array being resized, |
| 1946 | * chunksize will be zero, and we need to choose a suitable |
| 1947 | * chunksize, otherwise we use what we are given. |
| 1948 | */ |
| 1949 | struct bitmap_storage store; |
| 1950 | struct bitmap_counts old_counts; |
| 1951 | unsigned long chunks; |
| 1952 | sector_t block; |
| 1953 | sector_t old_blocks, new_blocks; |
| 1954 | int chunkshift; |
| 1955 | int ret = 0; |
| 1956 | long pages; |
| 1957 | struct bitmap_page *new_bp; |
| 1958 | |
| 1959 | if (chunksize == 0) { |
| 1960 | /* If there is enough space, leave the chunk size unchanged, |
| 1961 | * else increase by factor of two until there is enough space. |
| 1962 | */ |
| 1963 | long bytes; |
| 1964 | long space = bitmap->mddev->bitmap_info.space; |
| 1965 | |
| 1966 | if (space == 0) { |
| 1967 | /* We don't know how much space there is, so limit |
| 1968 | * to current size - in sectors. |
| 1969 | */ |
| 1970 | bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8); |
| 1971 | if (!bitmap->mddev->bitmap_info.external) |
| 1972 | bytes += sizeof(bitmap_super_t); |
| 1973 | space = DIV_ROUND_UP(bytes, 512); |
| 1974 | bitmap->mddev->bitmap_info.space = space; |
| 1975 | } |
| 1976 | chunkshift = bitmap->counts.chunkshift; |
| 1977 | chunkshift--; |
| 1978 | do { |
| 1979 | /* 'chunkshift' is shift from block size to chunk size */ |
| 1980 | chunkshift++; |
| 1981 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); |
| 1982 | bytes = DIV_ROUND_UP(chunks, 8); |
| 1983 | if (!bitmap->mddev->bitmap_info.external) |
| 1984 | bytes += sizeof(bitmap_super_t); |
| 1985 | } while (bytes > (space << 9)); |
| 1986 | } else |
| 1987 | chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT; |
| 1988 | |
| 1989 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); |
| 1990 | memset(&store, 0, sizeof(store)); |
| 1991 | if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file) |
| 1992 | ret = bitmap_storage_alloc(&store, chunks, |
Goldwyn Rodrigues | b97e9257 | 2014-06-06 11:50:56 -0500 | [diff] [blame] | 1993 | !bitmap->mddev->bitmap_info.external, |
| 1994 | bitmap->cluster_slot); |
NeilBrown | d60b479 | 2012-05-22 13:55:25 +1000 | [diff] [blame] | 1995 | if (ret) |
| 1996 | goto err; |
| 1997 | |
| 1998 | pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO); |
| 1999 | |
| 2000 | new_bp = kzalloc(pages * sizeof(*new_bp), GFP_KERNEL); |
| 2001 | ret = -ENOMEM; |
| 2002 | if (!new_bp) { |
| 2003 | bitmap_file_unmap(&store); |
| 2004 | goto err; |
| 2005 | } |
| 2006 | |
| 2007 | if (!init) |
| 2008 | bitmap->mddev->pers->quiesce(bitmap->mddev, 1); |
| 2009 | |
| 2010 | store.file = bitmap->storage.file; |
| 2011 | bitmap->storage.file = NULL; |
| 2012 | |
| 2013 | if (store.sb_page && bitmap->storage.sb_page) |
| 2014 | memcpy(page_address(store.sb_page), |
| 2015 | page_address(bitmap->storage.sb_page), |
| 2016 | sizeof(bitmap_super_t)); |
| 2017 | bitmap_file_unmap(&bitmap->storage); |
| 2018 | bitmap->storage = store; |
| 2019 | |
| 2020 | old_counts = bitmap->counts; |
| 2021 | bitmap->counts.bp = new_bp; |
| 2022 | bitmap->counts.pages = pages; |
| 2023 | bitmap->counts.missing_pages = pages; |
| 2024 | bitmap->counts.chunkshift = chunkshift; |
| 2025 | bitmap->counts.chunks = chunks; |
| 2026 | bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift + |
| 2027 | BITMAP_BLOCK_SHIFT); |
| 2028 | |
| 2029 | blocks = min(old_counts.chunks << old_counts.chunkshift, |
| 2030 | chunks << chunkshift); |
| 2031 | |
| 2032 | spin_lock_irq(&bitmap->counts.lock); |
| 2033 | for (block = 0; block < blocks; ) { |
| 2034 | bitmap_counter_t *bmc_old, *bmc_new; |
| 2035 | int set; |
| 2036 | |
| 2037 | bmc_old = bitmap_get_counter(&old_counts, block, |
| 2038 | &old_blocks, 0); |
| 2039 | set = bmc_old && NEEDED(*bmc_old); |
| 2040 | |
| 2041 | if (set) { |
| 2042 | bmc_new = bitmap_get_counter(&bitmap->counts, block, |
| 2043 | &new_blocks, 1); |
| 2044 | if (*bmc_new == 0) { |
| 2045 | /* need to set on-disk bits too. */ |
| 2046 | sector_t end = block + new_blocks; |
| 2047 | sector_t start = block >> chunkshift; |
| 2048 | start <<= chunkshift; |
| 2049 | while (start < end) { |
| 2050 | bitmap_file_set_bit(bitmap, block); |
| 2051 | start += 1 << chunkshift; |
| 2052 | } |
| 2053 | *bmc_new = 2; |
| 2054 | bitmap_count_page(&bitmap->counts, |
| 2055 | block, 1); |
| 2056 | bitmap_set_pending(&bitmap->counts, |
| 2057 | block); |
| 2058 | } |
| 2059 | *bmc_new |= NEEDED_MASK; |
| 2060 | if (new_blocks < old_blocks) |
| 2061 | old_blocks = new_blocks; |
| 2062 | } |
| 2063 | block += old_blocks; |
| 2064 | } |
| 2065 | |
| 2066 | if (!init) { |
| 2067 | int i; |
| 2068 | while (block < (chunks << chunkshift)) { |
| 2069 | bitmap_counter_t *bmc; |
| 2070 | bmc = bitmap_get_counter(&bitmap->counts, block, |
| 2071 | &new_blocks, 1); |
| 2072 | if (bmc) { |
| 2073 | /* new space. It needs to be resynced, so |
| 2074 | * we set NEEDED_MASK. |
| 2075 | */ |
| 2076 | if (*bmc == 0) { |
| 2077 | *bmc = NEEDED_MASK | 2; |
| 2078 | bitmap_count_page(&bitmap->counts, |
| 2079 | block, 1); |
| 2080 | bitmap_set_pending(&bitmap->counts, |
| 2081 | block); |
| 2082 | } |
| 2083 | } |
| 2084 | block += new_blocks; |
| 2085 | } |
| 2086 | for (i = 0; i < bitmap->storage.file_pages; i++) |
| 2087 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
| 2088 | } |
| 2089 | spin_unlock_irq(&bitmap->counts.lock); |
| 2090 | |
| 2091 | if (!init) { |
| 2092 | bitmap_unplug(bitmap); |
| 2093 | bitmap->mddev->pers->quiesce(bitmap->mddev, 0); |
| 2094 | } |
| 2095 | ret = 0; |
| 2096 | err: |
| 2097 | return ret; |
| 2098 | } |
| 2099 | EXPORT_SYMBOL_GPL(bitmap_resize); |
| 2100 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2101 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2102 | location_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2103 | { |
| 2104 | ssize_t len; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 2105 | if (mddev->bitmap_info.file) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2106 | len = sprintf(page, "file"); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 2107 | else if (mddev->bitmap_info.offset) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2108 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 2109 | else |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2110 | len = sprintf(page, "none"); |
| 2111 | len += sprintf(page+len, "\n"); |
| 2112 | return len; |
| 2113 | } |
| 2114 | |
| 2115 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2116 | location_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2117 | { |
| 2118 | |
| 2119 | if (mddev->pers) { |
| 2120 | if (!mddev->pers->quiesce) |
| 2121 | return -EBUSY; |
| 2122 | if (mddev->recovery || mddev->sync_thread) |
| 2123 | return -EBUSY; |
| 2124 | } |
| 2125 | |
| 2126 | if (mddev->bitmap || mddev->bitmap_info.file || |
| 2127 | mddev->bitmap_info.offset) { |
| 2128 | /* bitmap already configured. Only option is to clear it */ |
| 2129 | if (strncmp(buf, "none", 4) != 0) |
| 2130 | return -EBUSY; |
| 2131 | if (mddev->pers) { |
| 2132 | mddev->pers->quiesce(mddev, 1); |
| 2133 | bitmap_destroy(mddev); |
| 2134 | mddev->pers->quiesce(mddev, 0); |
| 2135 | } |
| 2136 | mddev->bitmap_info.offset = 0; |
| 2137 | if (mddev->bitmap_info.file) { |
| 2138 | struct file *f = mddev->bitmap_info.file; |
| 2139 | mddev->bitmap_info.file = NULL; |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2140 | fput(f); |
| 2141 | } |
| 2142 | } else { |
| 2143 | /* No bitmap, OK to set a location */ |
| 2144 | long long offset; |
| 2145 | if (strncmp(buf, "none", 4) == 0) |
| 2146 | /* nothing to be done */; |
| 2147 | else if (strncmp(buf, "file:", 5) == 0) { |
| 2148 | /* Not supported yet */ |
| 2149 | return -EINVAL; |
| 2150 | } else { |
| 2151 | int rv; |
| 2152 | if (buf[0] == '+') |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 2153 | rv = kstrtoll(buf+1, 10, &offset); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2154 | else |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 2155 | rv = kstrtoll(buf, 10, &offset); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2156 | if (rv) |
| 2157 | return rv; |
| 2158 | if (offset == 0) |
| 2159 | return -EINVAL; |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2160 | if (mddev->bitmap_info.external == 0 && |
| 2161 | mddev->major_version == 0 && |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2162 | offset != mddev->bitmap_info.default_offset) |
| 2163 | return -EINVAL; |
| 2164 | mddev->bitmap_info.offset = offset; |
| 2165 | if (mddev->pers) { |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 2166 | struct bitmap *bitmap; |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2167 | mddev->pers->quiesce(mddev, 1); |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 2168 | bitmap = bitmap_create(mddev, -1); |
| 2169 | if (IS_ERR(bitmap)) |
| 2170 | rv = PTR_ERR(bitmap); |
| 2171 | else { |
| 2172 | mddev->bitmap = bitmap; |
NeilBrown | 4474ca4 | 2012-03-19 12:46:37 +1100 | [diff] [blame] | 2173 | rv = bitmap_load(mddev); |
Goldwyn Rodrigues | f9209a3 | 2014-06-06 12:43:49 -0500 | [diff] [blame] | 2174 | if (rv) { |
| 2175 | bitmap_destroy(mddev); |
| 2176 | mddev->bitmap_info.offset = 0; |
| 2177 | } |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2178 | } |
| 2179 | mddev->pers->quiesce(mddev, 0); |
| 2180 | if (rv) |
| 2181 | return rv; |
| 2182 | } |
| 2183 | } |
| 2184 | } |
| 2185 | if (!mddev->external) { |
| 2186 | /* Ensure new bitmap info is stored in |
| 2187 | * metadata promptly. |
| 2188 | */ |
| 2189 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
| 2190 | md_wakeup_thread(mddev->thread); |
| 2191 | } |
| 2192 | return len; |
| 2193 | } |
| 2194 | |
| 2195 | static struct md_sysfs_entry bitmap_location = |
| 2196 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); |
| 2197 | |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 2198 | /* 'bitmap/space' is the space available at 'location' for the |
| 2199 | * bitmap. This allows the kernel to know when it is safe to |
| 2200 | * resize the bitmap to match a resized array. |
| 2201 | */ |
| 2202 | static ssize_t |
| 2203 | space_show(struct mddev *mddev, char *page) |
| 2204 | { |
| 2205 | return sprintf(page, "%lu\n", mddev->bitmap_info.space); |
| 2206 | } |
| 2207 | |
| 2208 | static ssize_t |
| 2209 | space_store(struct mddev *mddev, const char *buf, size_t len) |
| 2210 | { |
| 2211 | unsigned long sectors; |
| 2212 | int rv; |
| 2213 | |
| 2214 | rv = kstrtoul(buf, 10, §ors); |
| 2215 | if (rv) |
| 2216 | return rv; |
| 2217 | |
| 2218 | if (sectors == 0) |
| 2219 | return -EINVAL; |
| 2220 | |
| 2221 | if (mddev->bitmap && |
NeilBrown | 9b1215c | 2012-05-22 13:55:11 +1000 | [diff] [blame] | 2222 | sectors < (mddev->bitmap->storage.bytes + 511) >> 9) |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 2223 | return -EFBIG; /* Bitmap is too big for this small space */ |
| 2224 | |
| 2225 | /* could make sure it isn't too big, but that isn't really |
| 2226 | * needed - user-space should be careful. |
| 2227 | */ |
| 2228 | mddev->bitmap_info.space = sectors; |
| 2229 | return len; |
| 2230 | } |
| 2231 | |
| 2232 | static struct md_sysfs_entry bitmap_space = |
| 2233 | __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); |
| 2234 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2235 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2236 | timeout_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2237 | { |
| 2238 | ssize_t len; |
| 2239 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; |
| 2240 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; |
NeilBrown | ac2f40b | 2010-06-01 19:37:31 +1000 | [diff] [blame] | 2241 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2242 | len = sprintf(page, "%lu", secs); |
| 2243 | if (jifs) |
| 2244 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); |
| 2245 | len += sprintf(page+len, "\n"); |
| 2246 | return len; |
| 2247 | } |
| 2248 | |
| 2249 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2250 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2251 | { |
| 2252 | /* timeout can be set at any time */ |
| 2253 | unsigned long timeout; |
| 2254 | int rv = strict_strtoul_scaled(buf, &timeout, 4); |
| 2255 | if (rv) |
| 2256 | return rv; |
| 2257 | |
| 2258 | /* just to make sure we don't overflow... */ |
| 2259 | if (timeout >= LONG_MAX / HZ) |
| 2260 | return -EINVAL; |
| 2261 | |
| 2262 | timeout = timeout * HZ / 10000; |
| 2263 | |
| 2264 | if (timeout >= MAX_SCHEDULE_TIMEOUT) |
| 2265 | timeout = MAX_SCHEDULE_TIMEOUT-1; |
| 2266 | if (timeout < 1) |
| 2267 | timeout = 1; |
| 2268 | mddev->bitmap_info.daemon_sleep = timeout; |
| 2269 | if (mddev->thread) { |
| 2270 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then |
| 2271 | * the bitmap is all clean and we don't need to |
| 2272 | * adjust the timeout right now |
| 2273 | */ |
| 2274 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { |
| 2275 | mddev->thread->timeout = timeout; |
| 2276 | md_wakeup_thread(mddev->thread); |
| 2277 | } |
| 2278 | } |
| 2279 | return len; |
| 2280 | } |
| 2281 | |
| 2282 | static struct md_sysfs_entry bitmap_timeout = |
| 2283 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); |
| 2284 | |
| 2285 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2286 | backlog_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2287 | { |
| 2288 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); |
| 2289 | } |
| 2290 | |
| 2291 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2292 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2293 | { |
| 2294 | unsigned long backlog; |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 2295 | int rv = kstrtoul(buf, 10, &backlog); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2296 | if (rv) |
| 2297 | return rv; |
| 2298 | if (backlog > COUNTER_MAX) |
| 2299 | return -EINVAL; |
| 2300 | mddev->bitmap_info.max_write_behind = backlog; |
| 2301 | return len; |
| 2302 | } |
| 2303 | |
| 2304 | static struct md_sysfs_entry bitmap_backlog = |
| 2305 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); |
| 2306 | |
| 2307 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2308 | chunksize_show(struct mddev *mddev, char *page) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2309 | { |
| 2310 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); |
| 2311 | } |
| 2312 | |
| 2313 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2314 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2315 | { |
| 2316 | /* Can only be changed when no bitmap is active */ |
| 2317 | int rv; |
| 2318 | unsigned long csize; |
| 2319 | if (mddev->bitmap) |
| 2320 | return -EBUSY; |
Jingoo Han | b29bebd | 2013-06-01 16:15:16 +0900 | [diff] [blame] | 2321 | rv = kstrtoul(buf, 10, &csize); |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2322 | if (rv) |
| 2323 | return rv; |
| 2324 | if (csize < 512 || |
| 2325 | !is_power_of_2(csize)) |
| 2326 | return -EINVAL; |
| 2327 | mddev->bitmap_info.chunksize = csize; |
| 2328 | return len; |
| 2329 | } |
| 2330 | |
| 2331 | static struct md_sysfs_entry bitmap_chunksize = |
| 2332 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); |
| 2333 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2334 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2335 | { |
Goldwyn Rodrigues | c4ce867 | 2014-03-29 10:20:02 -0500 | [diff] [blame] | 2336 | if (mddev_is_clustered(mddev)) |
| 2337 | return sprintf(page, "clustered\n"); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2338 | return sprintf(page, "%s\n", (mddev->bitmap_info.external |
| 2339 | ? "external" : "internal")); |
| 2340 | } |
| 2341 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2342 | 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] | 2343 | { |
| 2344 | if (mddev->bitmap || |
| 2345 | mddev->bitmap_info.file || |
| 2346 | mddev->bitmap_info.offset) |
| 2347 | return -EBUSY; |
| 2348 | if (strncmp(buf, "external", 8) == 0) |
| 2349 | mddev->bitmap_info.external = 1; |
Goldwyn Rodrigues | c4ce867 | 2014-03-29 10:20:02 -0500 | [diff] [blame] | 2350 | else if ((strncmp(buf, "internal", 8) == 0) || |
| 2351 | (strncmp(buf, "clustered", 9) == 0)) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2352 | mddev->bitmap_info.external = 0; |
| 2353 | else |
| 2354 | return -EINVAL; |
| 2355 | return len; |
| 2356 | } |
| 2357 | |
| 2358 | static struct md_sysfs_entry bitmap_metadata = |
| 2359 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
| 2360 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2361 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2362 | { |
| 2363 | int len; |
NeilBrown | b7b17c9 | 2014-12-15 12:56:59 +1100 | [diff] [blame] | 2364 | spin_lock(&mddev->lock); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2365 | if (mddev->bitmap) |
| 2366 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? |
| 2367 | "false" : "true")); |
| 2368 | else |
| 2369 | len = sprintf(page, "\n"); |
NeilBrown | b7b17c9 | 2014-12-15 12:56:59 +1100 | [diff] [blame] | 2370 | spin_unlock(&mddev->lock); |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2371 | return len; |
| 2372 | } |
| 2373 | |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2374 | 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] | 2375 | { |
| 2376 | if (mddev->bitmap == NULL) |
| 2377 | return -ENOENT; |
| 2378 | if (strncmp(buf, "false", 5) == 0) |
| 2379 | mddev->bitmap->need_sync = 1; |
| 2380 | else if (strncmp(buf, "true", 4) == 0) { |
| 2381 | if (mddev->degraded) |
| 2382 | return -EBUSY; |
| 2383 | mddev->bitmap->need_sync = 0; |
| 2384 | } else |
| 2385 | return -EINVAL; |
| 2386 | return len; |
| 2387 | } |
| 2388 | |
| 2389 | static struct md_sysfs_entry bitmap_can_clear = |
| 2390 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); |
| 2391 | |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2392 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2393 | behind_writes_used_show(struct mddev *mddev, char *page) |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2394 | { |
NeilBrown | b7b17c9 | 2014-12-15 12:56:59 +1100 | [diff] [blame] | 2395 | ssize_t ret; |
| 2396 | spin_lock(&mddev->lock); |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2397 | if (mddev->bitmap == NULL) |
NeilBrown | b7b17c9 | 2014-12-15 12:56:59 +1100 | [diff] [blame] | 2398 | ret = sprintf(page, "0\n"); |
| 2399 | else |
| 2400 | ret = sprintf(page, "%lu\n", |
| 2401 | mddev->bitmap->behind_writes_used); |
| 2402 | spin_unlock(&mddev->lock); |
| 2403 | return ret; |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2404 | } |
| 2405 | |
| 2406 | static ssize_t |
NeilBrown | fd01b88 | 2011-10-11 16:47:53 +1100 | [diff] [blame] | 2407 | 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] | 2408 | { |
| 2409 | if (mddev->bitmap) |
| 2410 | mddev->bitmap->behind_writes_used = 0; |
| 2411 | return len; |
| 2412 | } |
| 2413 | |
| 2414 | static struct md_sysfs_entry max_backlog_used = |
| 2415 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, |
| 2416 | behind_writes_used_show, behind_writes_used_reset); |
| 2417 | |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2418 | static struct attribute *md_bitmap_attrs[] = { |
| 2419 | &bitmap_location.attr, |
NeilBrown | 6409bb0 | 2012-05-22 13:55:07 +1000 | [diff] [blame] | 2420 | &bitmap_space.attr, |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2421 | &bitmap_timeout.attr, |
| 2422 | &bitmap_backlog.attr, |
| 2423 | &bitmap_chunksize.attr, |
NeilBrown | ece5cff | 2009-12-14 12:49:56 +1100 | [diff] [blame] | 2424 | &bitmap_metadata.attr, |
| 2425 | &bitmap_can_clear.attr, |
Paul Clements | 696fcd5 | 2010-03-08 16:02:37 +1100 | [diff] [blame] | 2426 | &max_backlog_used.attr, |
NeilBrown | 43a7050 | 2009-12-14 12:49:55 +1100 | [diff] [blame] | 2427 | NULL |
| 2428 | }; |
| 2429 | struct attribute_group md_bitmap_group = { |
| 2430 | .name = "bitmap", |
| 2431 | .attrs = md_bitmap_attrs, |
| 2432 | }; |
| 2433 | |