Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
32a7627c N |
2 | /* |
3 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 | |
4 | * | |
5 | * bitmap_create - sets up the bitmap structure | |
6 | * bitmap_destroy - destroys the bitmap structure | |
7 | * | |
8 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: | |
9 | * - added disk storage for bitmap | |
10 | * - changes to allow various bitmap chunk sizes | |
32a7627c N |
11 | */ |
12 | ||
13 | /* | |
14 | * Still to do: | |
15 | * | |
16 | * flush after percent set rather than just time based. (maybe both). | |
32a7627c N |
17 | */ |
18 | ||
bff61975 | 19 | #include <linux/blkdev.h> |
32a7627c | 20 | #include <linux/module.h> |
32a7627c N |
21 | #include <linux/errno.h> |
22 | #include <linux/slab.h> | |
23 | #include <linux/init.h> | |
32a7627c N |
24 | #include <linux/timer.h> |
25 | #include <linux/sched.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/file.h> | |
28 | #include <linux/mount.h> | |
29 | #include <linux/buffer_head.h> | |
57148964 | 30 | #include <linux/seq_file.h> |
581dbd94 | 31 | #include <trace/events/block.h> |
43b2e5d8 | 32 | #include "md.h" |
935fe098 | 33 | #include "md-bitmap.h" |
32a7627c | 34 | |
ac2f40be | 35 | static inline char *bmname(struct bitmap *bitmap) |
32a7627c N |
36 | { |
37 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; | |
38 | } | |
39 | ||
32a7627c N |
40 | /* |
41 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) | |
42 | * | |
43 | * 1) check to see if this page is allocated, if it's not then try to alloc | |
44 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the | |
45 | * page pointer directly as a counter | |
46 | * | |
47 | * if we find our page, we increment the page's refcount so that it stays | |
48 | * allocated while we're using it | |
49 | */ | |
e64e4018 AS |
50 | static int md_bitmap_checkpage(struct bitmap_counts *bitmap, |
51 | unsigned long page, int create, int no_hijack) | |
ee305ace N |
52 | __releases(bitmap->lock) |
53 | __acquires(bitmap->lock) | |
32a7627c N |
54 | { |
55 | unsigned char *mappage; | |
56 | ||
57 | if (page >= bitmap->pages) { | |
1187cf0a N |
58 | /* This can happen if bitmap_start_sync goes beyond |
59 | * End-of-device while looking for a whole page. | |
60 | * It is harmless. | |
61 | */ | |
32a7627c N |
62 | return -EINVAL; |
63 | } | |
64 | ||
32a7627c N |
65 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
66 | return 0; | |
67 | ||
68 | if (bitmap->bp[page].map) /* page is already allocated, just return */ | |
69 | return 0; | |
70 | ||
71 | if (!create) | |
72 | return -ENOENT; | |
73 | ||
32a7627c N |
74 | /* this page has not been allocated yet */ |
75 | ||
ac2f40be | 76 | spin_unlock_irq(&bitmap->lock); |
d9590143 N |
77 | /* It is possible that this is being called inside a |
78 | * prepare_to_wait/finish_wait loop from raid5c:make_request(). | |
79 | * In general it is not permitted to sleep in that context as it | |
80 | * can cause the loop to spin freely. | |
81 | * That doesn't apply here as we can only reach this point | |
82 | * once with any loop. | |
83 | * When this function completes, either bp[page].map or | |
84 | * bp[page].hijacked. In either case, this function will | |
85 | * abort before getting to this point again. So there is | |
86 | * no risk of a free-spin, and so it is safe to assert | |
87 | * that sleeping here is allowed. | |
88 | */ | |
89 | sched_annotate_sleep(); | |
792a1d4b | 90 | mappage = kzalloc(PAGE_SIZE, GFP_NOIO); |
ac2f40be N |
91 | spin_lock_irq(&bitmap->lock); |
92 | ||
93 | if (mappage == NULL) { | |
40cffcc0 | 94 | pr_debug("md/bitmap: map page allocation failed, hijacking\n"); |
c9d65032 GJ |
95 | /* We don't support hijack for cluster raid */ |
96 | if (no_hijack) | |
97 | return -ENOMEM; | |
32a7627c N |
98 | /* failed - set the hijacked flag so that we can use the |
99 | * pointer as a counter */ | |
32a7627c N |
100 | if (!bitmap->bp[page].map) |
101 | bitmap->bp[page].hijacked = 1; | |
ac2f40be N |
102 | } else if (bitmap->bp[page].map || |
103 | bitmap->bp[page].hijacked) { | |
32a7627c | 104 | /* somebody beat us to getting the page */ |
792a1d4b | 105 | kfree(mappage); |
ac2f40be | 106 | } else { |
32a7627c | 107 | |
ac2f40be | 108 | /* no page was in place and we have one, so install it */ |
32a7627c | 109 | |
ac2f40be N |
110 | bitmap->bp[page].map = mappage; |
111 | bitmap->missing_pages--; | |
112 | } | |
32a7627c N |
113 | return 0; |
114 | } | |
115 | ||
32a7627c N |
116 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
117 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
118 | /* Note: lock should be held when calling this */ | |
e64e4018 | 119 | static void md_bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page) |
32a7627c N |
120 | { |
121 | char *ptr; | |
122 | ||
123 | if (bitmap->bp[page].count) /* page is still busy */ | |
124 | return; | |
125 | ||
126 | /* page is no longer in use, it can be released */ | |
127 | ||
128 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
129 | bitmap->bp[page].hijacked = 0; | |
130 | bitmap->bp[page].map = NULL; | |
ac2f40be N |
131 | } else { |
132 | /* normal case, free the page */ | |
133 | ptr = bitmap->bp[page].map; | |
134 | bitmap->bp[page].map = NULL; | |
135 | bitmap->missing_pages++; | |
792a1d4b | 136 | kfree(ptr); |
32a7627c | 137 | } |
32a7627c N |
138 | } |
139 | ||
32a7627c N |
140 | /* |
141 | * bitmap file handling - read and write the bitmap file and its superblock | |
142 | */ | |
143 | ||
32a7627c N |
144 | /* |
145 | * basic page I/O operations | |
146 | */ | |
147 | ||
a654b9d8 | 148 | /* IO operations when bitmap is stored near all superblocks */ |
27581e5a N |
149 | static int read_sb_page(struct mddev *mddev, loff_t offset, |
150 | struct page *page, | |
151 | unsigned long index, int size) | |
a654b9d8 N |
152 | { |
153 | /* choose a good rdev and read the page from there */ | |
154 | ||
3cb03002 | 155 | struct md_rdev *rdev; |
a654b9d8 | 156 | sector_t target; |
a654b9d8 | 157 | |
dafb20fa | 158 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 159 | if (! test_bit(In_sync, &rdev->flags) |
4aaf7694 GJ |
160 | || test_bit(Faulty, &rdev->flags) |
161 | || test_bit(Bitmap_sync, &rdev->flags)) | |
ab904d63 N |
162 | continue; |
163 | ||
ccebd4c4 | 164 | target = offset + index * (PAGE_SIZE/512); |
a654b9d8 | 165 | |
2b193363 | 166 | if (sync_page_io(rdev, target, |
e1defc4f | 167 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
4ce4c73f | 168 | page, REQ_OP_READ, true)) { |
ab904d63 | 169 | page->index = index; |
27581e5a | 170 | return 0; |
ab904d63 N |
171 | } |
172 | } | |
27581e5a | 173 | return -EIO; |
a654b9d8 N |
174 | } |
175 | ||
fd01b88c | 176 | static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) |
b2d2c4ce N |
177 | { |
178 | /* Iterate the disks of an mddev, using rcu to protect access to the | |
179 | * linked list, and raising the refcount of devices we return to ensure | |
180 | * they don't disappear while in use. | |
181 | * As devices are only added or removed when raid_disk is < 0 and | |
182 | * nr_pending is 0 and In_sync is clear, the entries we return will | |
183 | * still be in the same position on the list when we re-enter | |
fd177481 | 184 | * list_for_each_entry_continue_rcu. |
8532e343 N |
185 | * |
186 | * Note that if entered with 'rdev == NULL' to start at the | |
187 | * beginning, we temporarily assign 'rdev' to an address which | |
188 | * isn't really an rdev, but which can be used by | |
189 | * list_for_each_entry_continue_rcu() to find the first entry. | |
b2d2c4ce | 190 | */ |
b2d2c4ce N |
191 | rcu_read_lock(); |
192 | if (rdev == NULL) | |
193 | /* start at the beginning */ | |
8532e343 | 194 | rdev = list_entry(&mddev->disks, struct md_rdev, same_set); |
b2d2c4ce N |
195 | else { |
196 | /* release the previous rdev and start from there. */ | |
197 | rdev_dec_pending(rdev, mddev); | |
b2d2c4ce | 198 | } |
fd177481 | 199 | list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) { |
b2d2c4ce | 200 | if (rdev->raid_disk >= 0 && |
b2d2c4ce N |
201 | !test_bit(Faulty, &rdev->flags)) { |
202 | /* this is a usable devices */ | |
203 | atomic_inc(&rdev->nr_pending); | |
204 | rcu_read_unlock(); | |
205 | return rdev; | |
206 | } | |
207 | } | |
208 | rcu_read_unlock(); | |
209 | return NULL; | |
210 | } | |
211 | ||
ab6085c7 | 212 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
a654b9d8 | 213 | { |
46533ff7 | 214 | struct md_rdev *rdev; |
a6ff7e08 | 215 | struct block_device *bdev; |
fd01b88c | 216 | struct mddev *mddev = bitmap->mddev; |
1ec885cd | 217 | struct bitmap_storage *store = &bitmap->storage; |
a654b9d8 | 218 | |
46533ff7 N |
219 | restart: |
220 | rdev = NULL; | |
b2d2c4ce | 221 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
ac2f40be N |
222 | int size = PAGE_SIZE; |
223 | loff_t offset = mddev->bitmap_info.offset; | |
a6ff7e08 JB |
224 | |
225 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; | |
226 | ||
9b1215c1 N |
227 | if (page->index == store->file_pages-1) { |
228 | int last_page_size = store->bytes & (PAGE_SIZE-1); | |
229 | if (last_page_size == 0) | |
230 | last_page_size = PAGE_SIZE; | |
231 | size = roundup(last_page_size, | |
a6ff7e08 | 232 | bdev_logical_block_size(bdev)); |
9b1215c1 | 233 | } |
ac2f40be N |
234 | /* Just make sure we aren't corrupting data or |
235 | * metadata | |
236 | */ | |
237 | if (mddev->external) { | |
238 | /* Bitmap could be anywhere. */ | |
239 | if (rdev->sb_start + offset + (page->index | |
240 | * (PAGE_SIZE/512)) | |
241 | > rdev->data_offset | |
242 | && | |
243 | rdev->sb_start + offset | |
244 | < (rdev->data_offset + mddev->dev_sectors | |
245 | + (PAGE_SIZE/512))) | |
246 | goto bad_alignment; | |
247 | } else if (offset < 0) { | |
248 | /* DATA BITMAP METADATA */ | |
249 | if (offset | |
250 | + (long)(page->index * (PAGE_SIZE/512)) | |
251 | + size/512 > 0) | |
252 | /* bitmap runs in to metadata */ | |
253 | goto bad_alignment; | |
254 | if (rdev->data_offset + mddev->dev_sectors | |
255 | > rdev->sb_start + offset) | |
256 | /* data runs in to bitmap */ | |
257 | goto bad_alignment; | |
258 | } else if (rdev->sb_start < rdev->data_offset) { | |
259 | /* METADATA BITMAP DATA */ | |
260 | if (rdev->sb_start | |
261 | + offset | |
262 | + page->index*(PAGE_SIZE/512) + size/512 | |
263 | > rdev->data_offset) | |
264 | /* bitmap runs in to data */ | |
265 | goto bad_alignment; | |
266 | } else { | |
267 | /* DATA METADATA BITMAP - no problems */ | |
268 | } | |
269 | md_super_write(mddev, rdev, | |
270 | rdev->sb_start + offset | |
271 | + page->index * (PAGE_SIZE/512), | |
272 | size, | |
273 | page); | |
b2d2c4ce | 274 | } |
a654b9d8 | 275 | |
46533ff7 N |
276 | if (wait && md_super_wait(mddev) < 0) |
277 | goto restart; | |
a654b9d8 | 278 | return 0; |
4b80991c N |
279 | |
280 | bad_alignment: | |
4b80991c | 281 | return -EINVAL; |
a654b9d8 N |
282 | } |
283 | ||
e64e4018 | 284 | static void md_bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 285 | /* |
a654b9d8 | 286 | * write out a page to a file |
32a7627c | 287 | */ |
4ad13663 | 288 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 289 | { |
d785a06a | 290 | struct buffer_head *bh; |
32a7627c | 291 | |
1ec885cd | 292 | if (bitmap->storage.file == NULL) { |
f0d76d70 N |
293 | switch (write_sb_page(bitmap, page, wait)) { |
294 | case -EINVAL: | |
b405fe91 | 295 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); |
f0d76d70 | 296 | } |
4ad13663 | 297 | } else { |
a654b9d8 | 298 | |
4ad13663 | 299 | bh = page_buffers(page); |
c708443c | 300 | |
4ad13663 N |
301 | while (bh && bh->b_blocknr) { |
302 | atomic_inc(&bitmap->pending_writes); | |
303 | set_buffer_locked(bh); | |
304 | set_buffer_mapped(bh); | |
1420c4a5 | 305 | submit_bh(REQ_OP_WRITE | REQ_SYNC, bh); |
4ad13663 N |
306 | bh = bh->b_this_page; |
307 | } | |
d785a06a | 308 | |
ac2f40be | 309 | if (wait) |
4ad13663 N |
310 | wait_event(bitmap->write_wait, |
311 | atomic_read(&bitmap->pending_writes)==0); | |
8a5e9cf1 | 312 | } |
b405fe91 | 313 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
e64e4018 | 314 | md_bitmap_file_kick(bitmap); |
d785a06a N |
315 | } |
316 | ||
317 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
318 | { | |
319 | struct bitmap *bitmap = bh->b_private; | |
32a7627c | 320 | |
b405fe91 N |
321 | if (!uptodate) |
322 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); | |
d785a06a N |
323 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
324 | wake_up(&bitmap->write_wait); | |
325 | } | |
32a7627c | 326 | |
d785a06a N |
327 | static void free_buffers(struct page *page) |
328 | { | |
27581e5a | 329 | struct buffer_head *bh; |
77ad4bc7 | 330 | |
27581e5a N |
331 | if (!PagePrivate(page)) |
332 | return; | |
333 | ||
334 | bh = page_buffers(page); | |
d785a06a N |
335 | while (bh) { |
336 | struct buffer_head *next = bh->b_this_page; | |
337 | free_buffer_head(bh); | |
338 | bh = next; | |
77ad4bc7 | 339 | } |
db2c1d86 | 340 | detach_page_private(page); |
d785a06a | 341 | put_page(page); |
32a7627c N |
342 | } |
343 | ||
d785a06a N |
344 | /* read a page from a file. |
345 | * We both read the page, and attach buffers to the page to record the | |
346 | * address of each block (using bmap). These addresses will be used | |
347 | * to write the block later, completely bypassing the filesystem. | |
348 | * This usage is similar to how swap files are handled, and allows us | |
349 | * to write to a file with no concerns of memory allocation failing. | |
350 | */ | |
27581e5a N |
351 | static int read_page(struct file *file, unsigned long index, |
352 | struct bitmap *bitmap, | |
353 | unsigned long count, | |
354 | struct page *page) | |
32a7627c | 355 | { |
27581e5a | 356 | int ret = 0; |
496ad9aa | 357 | struct inode *inode = file_inode(file); |
d785a06a | 358 | struct buffer_head *bh; |
30460e1e | 359 | sector_t block, blk_cur; |
313b825f | 360 | unsigned long blocksize = i_blocksize(inode); |
32a7627c | 361 | |
36a4e1fe N |
362 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
363 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 364 | |
313b825f | 365 | bh = alloc_page_buffers(page, blocksize, false); |
d785a06a | 366 | if (!bh) { |
27581e5a | 367 | ret = -ENOMEM; |
32a7627c N |
368 | goto out; |
369 | } | |
db2c1d86 | 370 | attach_page_private(page, bh); |
30460e1e | 371 | blk_cur = index << (PAGE_SHIFT - inode->i_blkbits); |
d785a06a | 372 | while (bh) { |
30460e1e CM |
373 | block = blk_cur; |
374 | ||
d785a06a N |
375 | if (count == 0) |
376 | bh->b_blocknr = 0; | |
377 | else { | |
30460e1e CM |
378 | ret = bmap(inode, &block); |
379 | if (ret || !block) { | |
27581e5a | 380 | ret = -EINVAL; |
30460e1e | 381 | bh->b_blocknr = 0; |
d785a06a N |
382 | goto out; |
383 | } | |
30460e1e CM |
384 | |
385 | bh->b_blocknr = block; | |
d785a06a | 386 | bh->b_bdev = inode->i_sb->s_bdev; |
313b825f | 387 | if (count < blocksize) |
d785a06a N |
388 | count = 0; |
389 | else | |
313b825f | 390 | count -= blocksize; |
d785a06a N |
391 | |
392 | bh->b_end_io = end_bitmap_write; | |
393 | bh->b_private = bitmap; | |
ce25c31b N |
394 | atomic_inc(&bitmap->pending_writes); |
395 | set_buffer_locked(bh); | |
396 | set_buffer_mapped(bh); | |
1420c4a5 | 397 | submit_bh(REQ_OP_READ, bh); |
d785a06a | 398 | } |
30460e1e | 399 | blk_cur++; |
d785a06a N |
400 | bh = bh->b_this_page; |
401 | } | |
d785a06a | 402 | page->index = index; |
ce25c31b N |
403 | |
404 | wait_event(bitmap->write_wait, | |
405 | atomic_read(&bitmap->pending_writes)==0); | |
b405fe91 | 406 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
27581e5a | 407 | ret = -EIO; |
32a7627c | 408 | out: |
27581e5a | 409 | if (ret) |
ec0cc226 N |
410 | pr_err("md: bitmap read error: (%dB @ %llu): %d\n", |
411 | (int)PAGE_SIZE, | |
412 | (unsigned long long)index << PAGE_SHIFT, | |
413 | ret); | |
27581e5a | 414 | return ret; |
32a7627c N |
415 | } |
416 | ||
417 | /* | |
418 | * bitmap file superblock operations | |
419 | */ | |
420 | ||
85c9ccd4 | 421 | /* |
e64e4018 | 422 | * md_bitmap_wait_writes() should be called before writing any bitmap |
85c9ccd4 | 423 | * blocks, to ensure previous writes, particularly from |
e64e4018 | 424 | * md_bitmap_daemon_work(), have completed. |
85c9ccd4 | 425 | */ |
e64e4018 | 426 | static void md_bitmap_wait_writes(struct bitmap *bitmap) |
85c9ccd4 N |
427 | { |
428 | if (bitmap->storage.file) | |
429 | wait_event(bitmap->write_wait, | |
430 | atomic_read(&bitmap->pending_writes)==0); | |
431 | else | |
46533ff7 N |
432 | /* Note that we ignore the return value. The writes |
433 | * might have failed, but that would just mean that | |
434 | * some bits which should be cleared haven't been, | |
435 | * which is safe. The relevant bitmap blocks will | |
436 | * probably get written again, but there is no great | |
437 | * loss if they aren't. | |
438 | */ | |
85c9ccd4 N |
439 | md_super_wait(bitmap->mddev); |
440 | } | |
441 | ||
442 | ||
32a7627c | 443 | /* update the event counter and sync the superblock to disk */ |
e64e4018 | 444 | void md_bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
445 | { |
446 | bitmap_super_t *sb; | |
32a7627c N |
447 | |
448 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 449 | return; |
ece5cff0 N |
450 | if (bitmap->mddev->bitmap_info.external) |
451 | return; | |
1ec885cd | 452 | if (!bitmap->storage.sb_page) /* no superblock */ |
4ad13663 | 453 | return; |
1ec885cd | 454 | sb = kmap_atomic(bitmap->storage.sb_page); |
32a7627c | 455 | sb->events = cpu_to_le64(bitmap->mddev->events); |
8258c532 | 456 | if (bitmap->mddev->events < bitmap->events_cleared) |
a0da84f3 NB |
457 | /* rocking back to read-only */ |
458 | bitmap->events_cleared = bitmap->mddev->events; | |
8258c532 | 459 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
97f0eb9f HT |
460 | /* |
461 | * clear BITMAP_WRITE_ERROR bit to protect against the case that | |
462 | * a bitmap write error occurred but the later writes succeeded. | |
463 | */ | |
464 | sb->state = cpu_to_le32(bitmap->flags & ~BIT(BITMAP_WRITE_ERROR)); | |
43a70507 N |
465 | /* Just in case these have been changed via sysfs: */ |
466 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
467 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
b81a0404 N |
468 | /* This might have been changed by a reshape */ |
469 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
470 | sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize); | |
c4ce867f | 471 | sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes); |
1dff2b87 N |
472 | sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> |
473 | bitmap_info.space); | |
b2f46e68 | 474 | kunmap_atomic(sb); |
1ec885cd | 475 | write_page(bitmap, bitmap->storage.sb_page, 1); |
32a7627c | 476 | } |
e64e4018 | 477 | EXPORT_SYMBOL(md_bitmap_update_sb); |
32a7627c N |
478 | |
479 | /* print out the bitmap file superblock */ | |
e64e4018 | 480 | void md_bitmap_print_sb(struct bitmap *bitmap) |
32a7627c N |
481 | { |
482 | bitmap_super_t *sb; | |
483 | ||
1ec885cd | 484 | if (!bitmap || !bitmap->storage.sb_page) |
32a7627c | 485 | return; |
1ec885cd | 486 | sb = kmap_atomic(bitmap->storage.sb_page); |
ec0cc226 N |
487 | pr_debug("%s: bitmap file superblock:\n", bmname(bitmap)); |
488 | pr_debug(" magic: %08x\n", le32_to_cpu(sb->magic)); | |
489 | pr_debug(" version: %d\n", le32_to_cpu(sb->version)); | |
490 | pr_debug(" uuid: %08x.%08x.%08x.%08x\n", | |
c35403f8 CH |
491 | le32_to_cpu(*(__le32 *)(sb->uuid+0)), |
492 | le32_to_cpu(*(__le32 *)(sb->uuid+4)), | |
493 | le32_to_cpu(*(__le32 *)(sb->uuid+8)), | |
494 | le32_to_cpu(*(__le32 *)(sb->uuid+12))); | |
ec0cc226 N |
495 | pr_debug(" events: %llu\n", |
496 | (unsigned long long) le64_to_cpu(sb->events)); | |
497 | pr_debug("events cleared: %llu\n", | |
498 | (unsigned long long) le64_to_cpu(sb->events_cleared)); | |
499 | pr_debug(" state: %08x\n", le32_to_cpu(sb->state)); | |
500 | pr_debug(" chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
501 | pr_debug(" daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
502 | pr_debug(" sync size: %llu KB\n", | |
503 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
504 | pr_debug("max write behind: %d\n", le32_to_cpu(sb->write_behind)); | |
b2f46e68 | 505 | kunmap_atomic(sb); |
32a7627c N |
506 | } |
507 | ||
9c81075f JB |
508 | /* |
509 | * bitmap_new_disk_sb | |
510 | * @bitmap | |
511 | * | |
512 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb | |
513 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. | |
514 | * This function verifies 'bitmap_info' and populates the on-disk bitmap | |
515 | * structure, which is to be written to disk. | |
516 | * | |
517 | * Returns: 0 on success, -Exxx on error | |
518 | */ | |
e64e4018 | 519 | static int md_bitmap_new_disk_sb(struct bitmap *bitmap) |
9c81075f JB |
520 | { |
521 | bitmap_super_t *sb; | |
522 | unsigned long chunksize, daemon_sleep, write_behind; | |
9c81075f | 523 | |
d3b178ad | 524 | bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
582e2e05 JM |
525 | if (bitmap->storage.sb_page == NULL) |
526 | return -ENOMEM; | |
1ec885cd | 527 | bitmap->storage.sb_page->index = 0; |
9c81075f | 528 | |
1ec885cd | 529 | sb = kmap_atomic(bitmap->storage.sb_page); |
9c81075f JB |
530 | |
531 | sb->magic = cpu_to_le32(BITMAP_MAGIC); | |
532 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); | |
533 | ||
534 | chunksize = bitmap->mddev->bitmap_info.chunksize; | |
535 | BUG_ON(!chunksize); | |
536 | if (!is_power_of_2(chunksize)) { | |
b2f46e68 | 537 | kunmap_atomic(sb); |
ec0cc226 | 538 | pr_warn("bitmap chunksize not a power of 2\n"); |
9c81075f JB |
539 | return -EINVAL; |
540 | } | |
541 | sb->chunksize = cpu_to_le32(chunksize); | |
542 | ||
543 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; | |
c97e0602 | 544 | if (!daemon_sleep || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { |
ec0cc226 | 545 | pr_debug("Choosing daemon_sleep default (5 sec)\n"); |
9c81075f JB |
546 | daemon_sleep = 5 * HZ; |
547 | } | |
548 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); | |
549 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
550 | ||
551 | /* | |
552 | * FIXME: write_behind for RAID1. If not specified, what | |
553 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. | |
554 | */ | |
555 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; | |
556 | if (write_behind > COUNTER_MAX) | |
557 | write_behind = COUNTER_MAX / 2; | |
558 | sb->write_behind = cpu_to_le32(write_behind); | |
559 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
560 | ||
561 | /* keep the array size field of the bitmap superblock up to date */ | |
562 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
563 | ||
564 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); | |
565 | ||
b405fe91 | 566 | set_bit(BITMAP_STALE, &bitmap->flags); |
84e92345 | 567 | sb->state = cpu_to_le32(bitmap->flags); |
9c81075f JB |
568 | bitmap->events_cleared = bitmap->mddev->events; |
569 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
d3b178ad | 570 | bitmap->mddev->bitmap_info.nodes = 0; |
9c81075f | 571 | |
b2f46e68 | 572 | kunmap_atomic(sb); |
9c81075f JB |
573 | |
574 | return 0; | |
575 | } | |
576 | ||
32a7627c | 577 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
e64e4018 | 578 | static int md_bitmap_read_sb(struct bitmap *bitmap) |
32a7627c N |
579 | { |
580 | char *reason = NULL; | |
581 | bitmap_super_t *sb; | |
4b6d287f | 582 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c | 583 | unsigned long long events; |
c4ce867f | 584 | int nodes = 0; |
1dff2b87 | 585 | unsigned long sectors_reserved = 0; |
32a7627c | 586 | int err = -EINVAL; |
27581e5a | 587 | struct page *sb_page; |
33e38ac6 | 588 | loff_t offset = bitmap->mddev->bitmap_info.offset; |
32a7627c | 589 | |
1ec885cd | 590 | if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { |
ef99bf48 N |
591 | chunksize = 128 * 1024 * 1024; |
592 | daemon_sleep = 5 * HZ; | |
593 | write_behind = 0; | |
b405fe91 | 594 | set_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
595 | err = 0; |
596 | goto out_no_sb; | |
597 | } | |
32a7627c | 598 | /* page 0 is the superblock, read it... */ |
27581e5a N |
599 | sb_page = alloc_page(GFP_KERNEL); |
600 | if (!sb_page) | |
601 | return -ENOMEM; | |
1ec885cd | 602 | bitmap->storage.sb_page = sb_page; |
27581e5a | 603 | |
b97e9257 | 604 | re_read: |
f9209a32 GR |
605 | /* If cluster_slot is set, the cluster is setup */ |
606 | if (bitmap->cluster_slot >= 0) { | |
3b0e6aac | 607 | sector_t bm_blocks = bitmap->mddev->resync_max_sectors; |
f9209a32 | 608 | |
a913096d ZH |
609 | bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, |
610 | (bitmap->mddev->bitmap_info.chunksize >> 9)); | |
124eb761 GR |
611 | /* bits to bytes */ |
612 | bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t); | |
613 | /* to 4k blocks */ | |
935f3d4f | 614 | bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096); |
33e38ac6 | 615 | offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3)); |
ec0cc226 | 616 | pr_debug("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__, |
33e38ac6 | 617 | bitmap->cluster_slot, offset); |
f9209a32 GR |
618 | } |
619 | ||
1ec885cd N |
620 | if (bitmap->storage.file) { |
621 | loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); | |
f49d5e62 N |
622 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
623 | ||
1ec885cd | 624 | err = read_page(bitmap->storage.file, 0, |
27581e5a | 625 | bitmap, bytes, sb_page); |
f49d5e62 | 626 | } else { |
27581e5a | 627 | err = read_sb_page(bitmap->mddev, |
33e38ac6 | 628 | offset, |
27581e5a | 629 | sb_page, |
938b533d | 630 | 0, sizeof(bitmap_super_t)); |
a654b9d8 | 631 | } |
27581e5a | 632 | if (err) |
32a7627c | 633 | return err; |
32a7627c | 634 | |
b97e9257 | 635 | err = -EINVAL; |
27581e5a | 636 | sb = kmap_atomic(sb_page); |
32a7627c | 637 | |
32a7627c | 638 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 639 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 640 | write_behind = le32_to_cpu(sb->write_behind); |
1dff2b87 | 641 | sectors_reserved = le32_to_cpu(sb->sectors_reserved); |
32a7627c N |
642 | |
643 | /* verify that the bitmap-specific fields are valid */ | |
644 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
645 | reason = "bad magic"; | |
bd926c63 | 646 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
3c462c88 | 647 | le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED) |
32a7627c | 648 | reason = "unrecognized superblock version"; |
1187cf0a | 649 | else if (chunksize < 512) |
7dd5d34c | 650 | reason = "bitmap chunksize too small"; |
d744540c | 651 | else if (!is_power_of_2(chunksize)) |
32a7627c | 652 | reason = "bitmap chunksize not a power of 2"; |
1b04be96 | 653 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 654 | reason = "daemon sleep period out of range"; |
4b6d287f N |
655 | else if (write_behind > COUNTER_MAX) |
656 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c | 657 | if (reason) { |
ec0cc226 | 658 | pr_warn("%s: invalid bitmap file superblock: %s\n", |
32a7627c N |
659 | bmname(bitmap), reason); |
660 | goto out; | |
661 | } | |
662 | ||
e68cb83a HZ |
663 | /* |
664 | * Setup nodes/clustername only if bitmap version is | |
665 | * cluster-compatible | |
666 | */ | |
667 | if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) { | |
668 | nodes = le32_to_cpu(sb->nodes); | |
92d9aac9 | 669 | strscpy(bitmap->mddev->bitmap_info.cluster_name, |
e68cb83a HZ |
670 | sb->cluster_name, 64); |
671 | } | |
672 | ||
32a7627c N |
673 | /* keep the array size field of the bitmap superblock up to date */ |
674 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
675 | ||
278c1ca2 N |
676 | if (bitmap->mddev->persistent) { |
677 | /* | |
678 | * We have a persistent array superblock, so compare the | |
679 | * bitmap's UUID and event counter to the mddev's | |
680 | */ | |
681 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
ec0cc226 N |
682 | pr_warn("%s: bitmap superblock UUID mismatch\n", |
683 | bmname(bitmap)); | |
278c1ca2 N |
684 | goto out; |
685 | } | |
686 | events = le64_to_cpu(sb->events); | |
b97e9257 | 687 | if (!nodes && (events < bitmap->mddev->events)) { |
ec0cc226 N |
688 | pr_warn("%s: bitmap file is out of date (%llu < %llu) -- forcing full recovery\n", |
689 | bmname(bitmap), events, | |
690 | (unsigned long long) bitmap->mddev->events); | |
b405fe91 | 691 | set_bit(BITMAP_STALE, &bitmap->flags); |
278c1ca2 | 692 | } |
32a7627c | 693 | } |
278c1ca2 | 694 | |
32a7627c | 695 | /* assign fields using values from superblock */ |
4f2e639a | 696 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 | 697 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
b405fe91 | 698 | set_bit(BITMAP_HOSTENDIAN, &bitmap->flags); |
32a7627c N |
699 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
700 | err = 0; | |
b97e9257 | 701 | |
32a7627c | 702 | out: |
b2f46e68 | 703 | kunmap_atomic(sb); |
f7357273 | 704 | if (err == 0 && nodes && (bitmap->cluster_slot < 0)) { |
e68cb83a HZ |
705 | /* Assigning chunksize is required for "re_read" */ |
706 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
b97e9257 GR |
707 | err = md_setup_cluster(bitmap->mddev, nodes); |
708 | if (err) { | |
ec0cc226 N |
709 | pr_warn("%s: Could not setup cluster service (%d)\n", |
710 | bmname(bitmap), err); | |
b97e9257 GR |
711 | goto out_no_sb; |
712 | } | |
713 | bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev); | |
b97e9257 GR |
714 | goto re_read; |
715 | } | |
716 | ||
ef99bf48 | 717 | out_no_sb: |
e68cb83a HZ |
718 | if (err == 0) { |
719 | if (test_bit(BITMAP_STALE, &bitmap->flags)) | |
720 | bitmap->events_cleared = bitmap->mddev->events; | |
721 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
722 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
723 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
724 | bitmap->mddev->bitmap_info.nodes = nodes; | |
725 | if (bitmap->mddev->bitmap_info.space == 0 || | |
726 | bitmap->mddev->bitmap_info.space > sectors_reserved) | |
727 | bitmap->mddev->bitmap_info.space = sectors_reserved; | |
728 | } else { | |
e64e4018 | 729 | md_bitmap_print_sb(bitmap); |
f9209a32 | 730 | if (bitmap->cluster_slot < 0) |
b97e9257 GR |
731 | md_cluster_stop(bitmap->mddev); |
732 | } | |
32a7627c N |
733 | return err; |
734 | } | |
735 | ||
32a7627c N |
736 | /* |
737 | * general bitmap file operations | |
738 | */ | |
739 | ||
ece5cff0 N |
740 | /* |
741 | * on-disk bitmap: | |
742 | * | |
743 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
744 | * file a page at a time. There's a superblock at the start of the file. | |
745 | */ | |
32a7627c | 746 | /* calculate the index of the page that contains this bit */ |
1ec885cd N |
747 | static inline unsigned long file_page_index(struct bitmap_storage *store, |
748 | unsigned long chunk) | |
32a7627c | 749 | { |
1ec885cd | 750 | if (store->sb_page) |
ece5cff0 N |
751 | chunk += sizeof(bitmap_super_t) << 3; |
752 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
753 | } |
754 | ||
755 | /* calculate the (bit) offset of this bit within a page */ | |
1ec885cd N |
756 | static inline unsigned long file_page_offset(struct bitmap_storage *store, |
757 | unsigned long chunk) | |
32a7627c | 758 | { |
1ec885cd | 759 | if (store->sb_page) |
ece5cff0 N |
760 | chunk += sizeof(bitmap_super_t) << 3; |
761 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
762 | } |
763 | ||
764 | /* | |
765 | * return a pointer to the page in the filemap that contains the given bit | |
766 | * | |
32a7627c | 767 | */ |
1ec885cd | 768 | static inline struct page *filemap_get_page(struct bitmap_storage *store, |
3520fa4d | 769 | unsigned long chunk) |
32a7627c | 770 | { |
1ec885cd | 771 | if (file_page_index(store, chunk) >= store->file_pages) |
ac2f40be | 772 | return NULL; |
f2e06c58 | 773 | return store->filemap[file_page_index(store, chunk)]; |
32a7627c N |
774 | } |
775 | ||
e64e4018 AS |
776 | static int md_bitmap_storage_alloc(struct bitmap_storage *store, |
777 | unsigned long chunks, int with_super, | |
778 | int slot_number) | |
d1244cb0 | 779 | { |
b97e9257 | 780 | int pnum, offset = 0; |
d1244cb0 N |
781 | unsigned long num_pages; |
782 | unsigned long bytes; | |
783 | ||
784 | bytes = DIV_ROUND_UP(chunks, 8); | |
785 | if (with_super) | |
786 | bytes += sizeof(bitmap_super_t); | |
787 | ||
788 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); | |
7f86ffed | 789 | offset = slot_number * num_pages; |
d1244cb0 | 790 | |
6da2ec56 KC |
791 | store->filemap = kmalloc_array(num_pages, sizeof(struct page *), |
792 | GFP_KERNEL); | |
d1244cb0 N |
793 | if (!store->filemap) |
794 | return -ENOMEM; | |
795 | ||
796 | if (with_super && !store->sb_page) { | |
d60b479d | 797 | store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
798 | if (store->sb_page == NULL) |
799 | return -ENOMEM; | |
d1244cb0 | 800 | } |
b97e9257 | 801 | |
d1244cb0 N |
802 | pnum = 0; |
803 | if (store->sb_page) { | |
804 | store->filemap[0] = store->sb_page; | |
805 | pnum = 1; | |
b97e9257 | 806 | store->sb_page->index = offset; |
d1244cb0 | 807 | } |
b97e9257 | 808 | |
d1244cb0 | 809 | for ( ; pnum < num_pages; pnum++) { |
d60b479d | 810 | store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
811 | if (!store->filemap[pnum]) { |
812 | store->file_pages = pnum; | |
813 | return -ENOMEM; | |
814 | } | |
b97e9257 | 815 | store->filemap[pnum]->index = pnum + offset; |
d1244cb0 N |
816 | } |
817 | store->file_pages = pnum; | |
818 | ||
819 | /* We need 4 bits per page, rounded up to a multiple | |
820 | * of sizeof(unsigned long) */ | |
821 | store->filemap_attr = kzalloc( | |
822 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), | |
823 | GFP_KERNEL); | |
824 | if (!store->filemap_attr) | |
825 | return -ENOMEM; | |
826 | ||
827 | store->bytes = bytes; | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
e64e4018 | 832 | static void md_bitmap_file_unmap(struct bitmap_storage *store) |
32a7627c N |
833 | { |
834 | struct page **map, *sb_page; | |
32a7627c | 835 | int pages; |
fae7d326 | 836 | struct file *file; |
32a7627c | 837 | |
fae7d326 | 838 | file = store->file; |
1ec885cd | 839 | map = store->filemap; |
1ec885cd | 840 | pages = store->file_pages; |
1ec885cd | 841 | sb_page = store->sb_page; |
32a7627c N |
842 | |
843 | while (pages--) | |
ece5cff0 | 844 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 845 | free_buffers(map[pages]); |
32a7627c | 846 | kfree(map); |
fae7d326 | 847 | kfree(store->filemap_attr); |
32a7627c | 848 | |
d785a06a N |
849 | if (sb_page) |
850 | free_buffers(sb_page); | |
32a7627c | 851 | |
d785a06a | 852 | if (file) { |
496ad9aa | 853 | struct inode *inode = file_inode(file); |
fc0ecff6 | 854 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 855 | fput(file); |
d785a06a | 856 | } |
32a7627c N |
857 | } |
858 | ||
32a7627c N |
859 | /* |
860 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
861 | * then it is no longer reliable, so we stop using it and we mark the file | |
862 | * as failed in the superblock | |
863 | */ | |
e64e4018 | 864 | static void md_bitmap_file_kick(struct bitmap *bitmap) |
32a7627c N |
865 | { |
866 | char *path, *ptr = NULL; | |
867 | ||
b405fe91 | 868 | if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) { |
e64e4018 | 869 | md_bitmap_update_sb(bitmap); |
32a7627c | 870 | |
1ec885cd | 871 | if (bitmap->storage.file) { |
4ad13663 N |
872 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
873 | if (path) | |
9bf39ab2 | 874 | ptr = file_path(bitmap->storage.file, |
1ec885cd | 875 | path, PAGE_SIZE); |
6bcfd601 | 876 | |
ec0cc226 N |
877 | pr_warn("%s: kicking failed bitmap file %s from array!\n", |
878 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); | |
32a7627c | 879 | |
4ad13663 N |
880 | kfree(path); |
881 | } else | |
ec0cc226 N |
882 | pr_warn("%s: disabling internal bitmap due to errors\n", |
883 | bmname(bitmap)); | |
a654b9d8 | 884 | } |
32a7627c N |
885 | } |
886 | ||
887 | enum bitmap_page_attr { | |
ac2f40be | 888 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
5a537df4 N |
889 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
890 | * i.e. counter is 1 or 2. */ | |
ac2f40be | 891 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
32a7627c N |
892 | }; |
893 | ||
d189122d N |
894 | static inline void set_page_attr(struct bitmap *bitmap, int pnum, |
895 | enum bitmap_page_attr attr) | |
32a7627c | 896 | { |
bdfd1140 | 897 | set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
898 | } |
899 | ||
d189122d N |
900 | static inline void clear_page_attr(struct bitmap *bitmap, int pnum, |
901 | enum bitmap_page_attr attr) | |
32a7627c | 902 | { |
bdfd1140 | 903 | clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
904 | } |
905 | ||
bdfd1140 N |
906 | static inline int test_page_attr(struct bitmap *bitmap, int pnum, |
907 | enum bitmap_page_attr attr) | |
32a7627c | 908 | { |
1ec885cd | 909 | return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
910 | } |
911 | ||
bdfd1140 N |
912 | static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum, |
913 | enum bitmap_page_attr attr) | |
914 | { | |
915 | return test_and_clear_bit((pnum<<2) + attr, | |
916 | bitmap->storage.filemap_attr); | |
917 | } | |
32a7627c N |
918 | /* |
919 | * bitmap_file_set_bit -- called before performing a write to the md device | |
920 | * to set (and eventually sync) a particular bit in the bitmap file | |
921 | * | |
922 | * we set the bit immediately, then we record the page number so that | |
923 | * when an unplug occurs, we can flush the dirty pages out to disk | |
924 | */ | |
e64e4018 | 925 | static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) |
32a7627c N |
926 | { |
927 | unsigned long bit; | |
3520fa4d | 928 | struct page *page; |
32a7627c | 929 | void *kaddr; |
40cffcc0 | 930 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
23cea66a GJ |
931 | struct bitmap_storage *store = &bitmap->storage; |
932 | unsigned long node_offset = 0; | |
933 | ||
934 | if (mddev_is_clustered(bitmap->mddev)) | |
935 | node_offset = bitmap->cluster_slot * store->file_pages; | |
32a7627c | 936 | |
1ec885cd | 937 | page = filemap_get_page(&bitmap->storage, chunk); |
3520fa4d JB |
938 | if (!page) |
939 | return; | |
1ec885cd | 940 | bit = file_page_offset(&bitmap->storage, chunk); |
32a7627c | 941 | |
3520fa4d | 942 | /* set the bit */ |
b2f46e68 | 943 | kaddr = kmap_atomic(page); |
b405fe91 | 944 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
3520fa4d JB |
945 | set_bit(bit, kaddr); |
946 | else | |
3f810b6c | 947 | set_bit_le(bit, kaddr); |
b2f46e68 | 948 | kunmap_atomic(kaddr); |
36a4e1fe | 949 | pr_debug("set file bit %lu page %lu\n", bit, page->index); |
32a7627c | 950 | /* record page number so it gets flushed to disk when unplug occurs */ |
23cea66a | 951 | set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_DIRTY); |
32a7627c N |
952 | } |
953 | ||
e64e4018 | 954 | static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) |
ef99bf48 N |
955 | { |
956 | unsigned long bit; | |
957 | struct page *page; | |
958 | void *paddr; | |
40cffcc0 | 959 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
23cea66a GJ |
960 | struct bitmap_storage *store = &bitmap->storage; |
961 | unsigned long node_offset = 0; | |
962 | ||
963 | if (mddev_is_clustered(bitmap->mddev)) | |
964 | node_offset = bitmap->cluster_slot * store->file_pages; | |
ef99bf48 | 965 | |
1ec885cd | 966 | page = filemap_get_page(&bitmap->storage, chunk); |
ef99bf48 N |
967 | if (!page) |
968 | return; | |
1ec885cd | 969 | bit = file_page_offset(&bitmap->storage, chunk); |
ef99bf48 | 970 | paddr = kmap_atomic(page); |
b405fe91 | 971 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
ef99bf48 N |
972 | clear_bit(bit, paddr); |
973 | else | |
3f810b6c | 974 | clear_bit_le(bit, paddr); |
ef99bf48 | 975 | kunmap_atomic(paddr); |
23cea66a GJ |
976 | if (!test_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_NEEDWRITE)) { |
977 | set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_PENDING); | |
ef99bf48 N |
978 | bitmap->allclean = 0; |
979 | } | |
980 | } | |
981 | ||
e64e4018 | 982 | static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) |
11dd35da GR |
983 | { |
984 | unsigned long bit; | |
985 | struct page *page; | |
986 | void *paddr; | |
987 | unsigned long chunk = block >> bitmap->counts.chunkshift; | |
988 | int set = 0; | |
989 | ||
990 | page = filemap_get_page(&bitmap->storage, chunk); | |
991 | if (!page) | |
992 | return -EINVAL; | |
993 | bit = file_page_offset(&bitmap->storage, chunk); | |
994 | paddr = kmap_atomic(page); | |
995 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) | |
996 | set = test_bit(bit, paddr); | |
997 | else | |
998 | set = test_bit_le(bit, paddr); | |
999 | kunmap_atomic(paddr); | |
1000 | return set; | |
1001 | } | |
1002 | ||
1003 | ||
32a7627c N |
1004 | /* this gets called when the md device is ready to unplug its underlying |
1005 | * (slave) device queues -- before we let any writes go down, we need to | |
1006 | * sync the dirty pages of the bitmap file to disk */ | |
e64e4018 | 1007 | void md_bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 1008 | { |
74667123 | 1009 | unsigned long i; |
ec7a3197 | 1010 | int dirty, need_write; |
85c9ccd4 | 1011 | int writing = 0; |
32a7627c | 1012 | |
62f82faa N |
1013 | if (!bitmap || !bitmap->storage.filemap || |
1014 | test_bit(BITMAP_STALE, &bitmap->flags)) | |
4ad13663 | 1015 | return; |
32a7627c N |
1016 | |
1017 | /* look at each page to see if there are any set bits that need to be | |
1018 | * flushed out to disk */ | |
1ec885cd | 1019 | for (i = 0; i < bitmap->storage.file_pages; i++) { |
bdfd1140 N |
1020 | dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
1021 | need_write = test_and_clear_page_attr(bitmap, i, | |
1022 | BITMAP_PAGE_NEEDWRITE); | |
1023 | if (dirty || need_write) { | |
581dbd94 | 1024 | if (!writing) { |
e64e4018 | 1025 | md_bitmap_wait_writes(bitmap); |
581dbd94 N |
1026 | if (bitmap->mddev->queue) |
1027 | blk_add_trace_msg(bitmap->mddev->queue, | |
1028 | "md bitmap_unplug"); | |
1029 | } | |
d189122d | 1030 | clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); |
bdfd1140 | 1031 | write_page(bitmap, bitmap->storage.filemap[i], 0); |
85c9ccd4 | 1032 | writing = 1; |
bdfd1140 | 1033 | } |
32a7627c | 1034 | } |
85c9ccd4 | 1035 | if (writing) |
e64e4018 | 1036 | md_bitmap_wait_writes(bitmap); |
4b5060dd | 1037 | |
b405fe91 | 1038 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
e64e4018 | 1039 | md_bitmap_file_kick(bitmap); |
32a7627c | 1040 | } |
e64e4018 | 1041 | EXPORT_SYMBOL(md_bitmap_unplug); |
32a7627c | 1042 | |
e64e4018 | 1043 | static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
1044 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
1045 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
1046 | * memory mapping of the bitmap file | |
1047 | * Special cases: | |
1048 | * if there's no bitmap file, or if the bitmap file had been | |
1049 | * previously kicked from the array, we mark all the bits as | |
1050 | * 1's in order to cause a full resync. | |
6a07997f N |
1051 | * |
1052 | * We ignore all bits for sectors that end earlier than 'start'. | |
1053 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 1054 | */ |
e64e4018 | 1055 | static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c | 1056 | { |
b97e9257 | 1057 | unsigned long i, chunks, index, oldindex, bit, node_offset = 0; |
27581e5a | 1058 | struct page *page = NULL; |
d1244cb0 | 1059 | unsigned long bit_cnt = 0; |
32a7627c | 1060 | struct file *file; |
d1244cb0 | 1061 | unsigned long offset; |
32a7627c N |
1062 | int outofdate; |
1063 | int ret = -ENOSPC; | |
ea03aff9 | 1064 | void *paddr; |
1ec885cd | 1065 | struct bitmap_storage *store = &bitmap->storage; |
32a7627c | 1066 | |
40cffcc0 | 1067 | chunks = bitmap->counts.chunks; |
1ec885cd | 1068 | file = store->file; |
32a7627c | 1069 | |
ef99bf48 N |
1070 | if (!file && !bitmap->mddev->bitmap_info.offset) { |
1071 | /* No permanent bitmap - fill with '1s'. */ | |
1ec885cd N |
1072 | store->filemap = NULL; |
1073 | store->file_pages = 0; | |
ef99bf48 N |
1074 | for (i = 0; i < chunks ; i++) { |
1075 | /* if the disk bit is set, set the memory bit */ | |
40cffcc0 | 1076 | int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift) |
ef99bf48 | 1077 | >= start); |
e64e4018 AS |
1078 | md_bitmap_set_memory_bits(bitmap, |
1079 | (sector_t)i << bitmap->counts.chunkshift, | |
1080 | needed); | |
ef99bf48 N |
1081 | } |
1082 | return 0; | |
1083 | } | |
32a7627c | 1084 | |
b405fe91 | 1085 | outofdate = test_bit(BITMAP_STALE, &bitmap->flags); |
32a7627c | 1086 | if (outofdate) |
ec0cc226 | 1087 | pr_warn("%s: bitmap file is out of date, doing full recovery\n", bmname(bitmap)); |
32a7627c | 1088 | |
d1244cb0 | 1089 | if (file && i_size_read(file->f_mapping->host) < store->bytes) { |
ec0cc226 N |
1090 | pr_warn("%s: bitmap file too short %lu < %lu\n", |
1091 | bmname(bitmap), | |
1092 | (unsigned long) i_size_read(file->f_mapping->host), | |
1093 | store->bytes); | |
4ad13663 | 1094 | goto err; |
32a7627c | 1095 | } |
bc7f77de | 1096 | |
d1244cb0 | 1097 | oldindex = ~0L; |
27581e5a | 1098 | offset = 0; |
d1244cb0 | 1099 | if (!bitmap->mddev->bitmap_info.external) |
27581e5a | 1100 | offset = sizeof(bitmap_super_t); |
32a7627c | 1101 | |
b97e9257 GR |
1102 | if (mddev_is_clustered(bitmap->mddev)) |
1103 | node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE)); | |
1104 | ||
32a7627c | 1105 | for (i = 0; i < chunks; i++) { |
bd926c63 | 1106 | int b; |
1ec885cd N |
1107 | index = file_page_index(&bitmap->storage, i); |
1108 | bit = file_page_offset(&bitmap->storage, i); | |
32a7627c | 1109 | if (index != oldindex) { /* this is a new page, read it in */ |
d785a06a | 1110 | int count; |
32a7627c | 1111 | /* unmap the old page, we're done with it */ |
d1244cb0 N |
1112 | if (index == store->file_pages-1) |
1113 | count = store->bytes - index * PAGE_SIZE; | |
d785a06a N |
1114 | else |
1115 | count = PAGE_SIZE; | |
1ec885cd | 1116 | page = store->filemap[index]; |
27581e5a N |
1117 | if (file) |
1118 | ret = read_page(file, index, bitmap, | |
1119 | count, page); | |
1120 | else | |
1121 | ret = read_sb_page( | |
1122 | bitmap->mddev, | |
1123 | bitmap->mddev->bitmap_info.offset, | |
1124 | page, | |
b97e9257 | 1125 | index + node_offset, count); |
27581e5a N |
1126 | |
1127 | if (ret) | |
4ad13663 | 1128 | goto err; |
a654b9d8 | 1129 | |
32a7627c | 1130 | oldindex = index; |
32a7627c N |
1131 | |
1132 | if (outofdate) { | |
1133 | /* | |
1134 | * if bitmap is out of date, dirty the | |
ac2f40be | 1135 | * whole page and write it out |
32a7627c | 1136 | */ |
b2f46e68 | 1137 | paddr = kmap_atomic(page); |
ea03aff9 | 1138 | memset(paddr + offset, 0xff, |
6a07997f | 1139 | PAGE_SIZE - offset); |
b2f46e68 | 1140 | kunmap_atomic(paddr); |
4ad13663 N |
1141 | write_page(bitmap, page, 1); |
1142 | ||
1143 | ret = -EIO; | |
b405fe91 N |
1144 | if (test_bit(BITMAP_WRITE_ERROR, |
1145 | &bitmap->flags)) | |
4ad13663 | 1146 | goto err; |
32a7627c | 1147 | } |
32a7627c | 1148 | } |
b2f46e68 | 1149 | paddr = kmap_atomic(page); |
b405fe91 | 1150 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
ea03aff9 | 1151 | b = test_bit(bit, paddr); |
bd926c63 | 1152 | else |
6b33aff3 | 1153 | b = test_bit_le(bit, paddr); |
b2f46e68 | 1154 | kunmap_atomic(paddr); |
bd926c63 | 1155 | if (b) { |
32a7627c | 1156 | /* if the disk bit is set, set the memory bit */ |
40cffcc0 | 1157 | int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift |
db305e50 | 1158 | >= start); |
e64e4018 AS |
1159 | md_bitmap_set_memory_bits(bitmap, |
1160 | (sector_t)i << bitmap->counts.chunkshift, | |
1161 | needed); | |
32a7627c N |
1162 | bit_cnt++; |
1163 | } | |
27581e5a | 1164 | offset = 0; |
32a7627c N |
1165 | } |
1166 | ||
ec0cc226 N |
1167 | pr_debug("%s: bitmap initialized from disk: read %lu pages, set %lu of %lu bits\n", |
1168 | bmname(bitmap), store->file_pages, | |
1169 | bit_cnt, chunks); | |
4ad13663 N |
1170 | |
1171 | return 0; | |
32a7627c | 1172 | |
4ad13663 | 1173 | err: |
ec0cc226 N |
1174 | pr_warn("%s: bitmap initialisation failed: %d\n", |
1175 | bmname(bitmap), ret); | |
32a7627c N |
1176 | return ret; |
1177 | } | |
1178 | ||
e64e4018 | 1179 | void md_bitmap_write_all(struct bitmap *bitmap) |
a654b9d8 N |
1180 | { |
1181 | /* We don't actually write all bitmap blocks here, | |
1182 | * just flag them as needing to be written | |
1183 | */ | |
ec7a3197 | 1184 | int i; |
a654b9d8 | 1185 | |
1ec885cd | 1186 | if (!bitmap || !bitmap->storage.filemap) |
ef99bf48 | 1187 | return; |
1ec885cd | 1188 | if (bitmap->storage.file) |
ef99bf48 N |
1189 | /* Only one copy, so nothing needed */ |
1190 | return; | |
1191 | ||
1ec885cd | 1192 | for (i = 0; i < bitmap->storage.file_pages; i++) |
d189122d | 1193 | set_page_attr(bitmap, i, |
ec7a3197 | 1194 | BITMAP_PAGE_NEEDWRITE); |
2585f3ef | 1195 | bitmap->allclean = 0; |
a654b9d8 N |
1196 | } |
1197 | ||
e64e4018 AS |
1198 | static void md_bitmap_count_page(struct bitmap_counts *bitmap, |
1199 | sector_t offset, int inc) | |
32a7627c | 1200 | { |
61a0d80c | 1201 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1202 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1203 | bitmap->bp[page].count += inc; | |
e64e4018 | 1204 | md_bitmap_checkfree(bitmap, page); |
32a7627c | 1205 | } |
bf07bb7d | 1206 | |
e64e4018 | 1207 | static void md_bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset) |
bf07bb7d N |
1208 | { |
1209 | sector_t chunk = offset >> bitmap->chunkshift; | |
1210 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1211 | struct bitmap_page *bp = &bitmap->bp[page]; | |
1212 | ||
1213 | if (!bp->pending) | |
1214 | bp->pending = 1; | |
1215 | } | |
1216 | ||
e64e4018 AS |
1217 | static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap, |
1218 | sector_t offset, sector_t *blocks, | |
1219 | int create); | |
32a7627c N |
1220 | |
1221 | /* | |
1222 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1223 | * out to disk | |
1224 | */ | |
1225 | ||
e64e4018 | 1226 | void md_bitmap_daemon_work(struct mddev *mddev) |
32a7627c | 1227 | { |
aa5cbd10 | 1228 | struct bitmap *bitmap; |
aa3163f8 | 1229 | unsigned long j; |
bf07bb7d | 1230 | unsigned long nextpage; |
57dab0bd | 1231 | sector_t blocks; |
40cffcc0 | 1232 | struct bitmap_counts *counts; |
32a7627c | 1233 | |
aa5cbd10 N |
1234 | /* Use a mutex to guard daemon_work against |
1235 | * bitmap_destroy. | |
1236 | */ | |
c3d9714e | 1237 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1238 | bitmap = mddev->bitmap; |
1239 | if (bitmap == NULL) { | |
c3d9714e | 1240 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1241 | return; |
aa5cbd10 | 1242 | } |
42a04b50 | 1243 | if (time_before(jiffies, bitmap->daemon_lastrun |
2e61ebbc | 1244 | + mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1245 | goto done; |
1246 | ||
32a7627c | 1247 | bitmap->daemon_lastrun = jiffies; |
8311c29d | 1248 | if (bitmap->allclean) { |
2e61ebbc | 1249 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
aa5cbd10 | 1250 | goto done; |
8311c29d N |
1251 | } |
1252 | bitmap->allclean = 1; | |
32a7627c | 1253 | |
581dbd94 N |
1254 | if (bitmap->mddev->queue) |
1255 | blk_add_trace_msg(bitmap->mddev->queue, | |
1256 | "md bitmap_daemon_work"); | |
1257 | ||
bf07bb7d N |
1258 | /* Any file-page which is PENDING now needs to be written. |
1259 | * So set NEEDWRITE now, then after we make any last-minute changes | |
1260 | * we will write it. | |
1261 | */ | |
1ec885cd | 1262 | for (j = 0; j < bitmap->storage.file_pages; j++) |
bdfd1140 N |
1263 | if (test_and_clear_page_attr(bitmap, j, |
1264 | BITMAP_PAGE_PENDING)) | |
d189122d | 1265 | set_page_attr(bitmap, j, |
bf07bb7d | 1266 | BITMAP_PAGE_NEEDWRITE); |
bf07bb7d N |
1267 | |
1268 | if (bitmap->need_sync && | |
1269 | mddev->bitmap_info.external == 0) { | |
1270 | /* Arrange for superblock update as well as | |
1271 | * other changes */ | |
1272 | bitmap_super_t *sb; | |
1273 | bitmap->need_sync = 0; | |
1ec885cd N |
1274 | if (bitmap->storage.filemap) { |
1275 | sb = kmap_atomic(bitmap->storage.sb_page); | |
ef99bf48 N |
1276 | sb->events_cleared = |
1277 | cpu_to_le64(bitmap->events_cleared); | |
1278 | kunmap_atomic(sb); | |
d189122d | 1279 | set_page_attr(bitmap, 0, |
ef99bf48 N |
1280 | BITMAP_PAGE_NEEDWRITE); |
1281 | } | |
bf07bb7d N |
1282 | } |
1283 | /* Now look at the bitmap counters and if any are '2' or '1', | |
1284 | * decrement and handle accordingly. | |
1285 | */ | |
40cffcc0 N |
1286 | counts = &bitmap->counts; |
1287 | spin_lock_irq(&counts->lock); | |
bf07bb7d | 1288 | nextpage = 0; |
40cffcc0 | 1289 | for (j = 0; j < counts->chunks; j++) { |
32a7627c | 1290 | bitmap_counter_t *bmc; |
40cffcc0 | 1291 | sector_t block = (sector_t)j << counts->chunkshift; |
3520fa4d | 1292 | |
bf07bb7d N |
1293 | if (j == nextpage) { |
1294 | nextpage += PAGE_COUNTER_RATIO; | |
40cffcc0 | 1295 | if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) { |
bf07bb7d | 1296 | j |= PAGE_COUNTER_MASK; |
aa3163f8 N |
1297 | continue; |
1298 | } | |
40cffcc0 | 1299 | counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; |
32a7627c | 1300 | } |
bf07bb7d | 1301 | |
e64e4018 | 1302 | bmc = md_bitmap_get_counter(counts, block, &blocks, 0); |
bf07bb7d | 1303 | if (!bmc) { |
5a537df4 | 1304 | j |= PAGE_COUNTER_MASK; |
bf07bb7d N |
1305 | continue; |
1306 | } | |
1307 | if (*bmc == 1 && !bitmap->need_sync) { | |
1308 | /* We can clear the bit */ | |
bf07bb7d | 1309 | *bmc = 0; |
e64e4018 AS |
1310 | md_bitmap_count_page(counts, block, -1); |
1311 | md_bitmap_file_clear_bit(bitmap, block); | |
bf07bb7d N |
1312 | } else if (*bmc && *bmc <= 2) { |
1313 | *bmc = 1; | |
e64e4018 | 1314 | md_bitmap_set_pending(counts, block); |
bf07bb7d | 1315 | bitmap->allclean = 0; |
5a537df4 | 1316 | } |
32a7627c | 1317 | } |
40cffcc0 | 1318 | spin_unlock_irq(&counts->lock); |
32a7627c | 1319 | |
e64e4018 | 1320 | md_bitmap_wait_writes(bitmap); |
bf07bb7d N |
1321 | /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. |
1322 | * DIRTY pages need to be written by bitmap_unplug so it can wait | |
1323 | * for them. | |
1324 | * If we find any DIRTY page we stop there and let bitmap_unplug | |
1325 | * handle all the rest. This is important in the case where | |
1326 | * the first blocking holds the superblock and it has been updated. | |
1327 | * We mustn't write any other blocks before the superblock. | |
1328 | */ | |
62f82faa N |
1329 | for (j = 0; |
1330 | j < bitmap->storage.file_pages | |
1331 | && !test_bit(BITMAP_STALE, &bitmap->flags); | |
1332 | j++) { | |
d189122d | 1333 | if (test_page_attr(bitmap, j, |
bf07bb7d N |
1334 | BITMAP_PAGE_DIRTY)) |
1335 | /* bitmap_unplug will handle the rest */ | |
1336 | break; | |
55180498 ZL |
1337 | if (bitmap->storage.filemap && |
1338 | test_and_clear_page_attr(bitmap, j, | |
bdfd1140 | 1339 | BITMAP_PAGE_NEEDWRITE)) { |
1ec885cd | 1340 | write_page(bitmap, bitmap->storage.filemap[j], 0); |
32a7627c | 1341 | } |
32a7627c N |
1342 | } |
1343 | ||
7be3dfec | 1344 | done: |
8311c29d | 1345 | if (bitmap->allclean == 0) |
2e61ebbc N |
1346 | mddev->thread->timeout = |
1347 | mddev->bitmap_info.daemon_sleep; | |
c3d9714e | 1348 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1349 | } |
1350 | ||
e64e4018 AS |
1351 | static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap, |
1352 | sector_t offset, sector_t *blocks, | |
1353 | int create) | |
ee305ace N |
1354 | __releases(bitmap->lock) |
1355 | __acquires(bitmap->lock) | |
32a7627c N |
1356 | { |
1357 | /* If 'create', we might release the lock and reclaim it. | |
1358 | * The lock must have been taken with interrupts enabled. | |
1359 | * If !create, we don't release the lock. | |
1360 | */ | |
61a0d80c | 1361 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1362 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1363 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1364 | sector_t csize; | |
ef425673 | 1365 | int err; |
32a7627c | 1366 | |
e64e4018 | 1367 | err = md_bitmap_checkpage(bitmap, page, create, 0); |
ef425673 N |
1368 | |
1369 | if (bitmap->bp[page].hijacked || | |
1370 | bitmap->bp[page].map == NULL) | |
61a0d80c | 1371 | csize = ((sector_t)1) << (bitmap->chunkshift + |
d837f727 | 1372 | PAGE_COUNTER_SHIFT); |
ef425673 | 1373 | else |
61a0d80c | 1374 | csize = ((sector_t)1) << bitmap->chunkshift; |
ef425673 N |
1375 | *blocks = csize - (offset & (csize - 1)); |
1376 | ||
1377 | if (err < 0) | |
32a7627c | 1378 | return NULL; |
ef425673 | 1379 | |
32a7627c N |
1380 | /* now locked ... */ |
1381 | ||
1382 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1383 | /* should we use the first or second counter field | |
1384 | * of the hijacked pointer? */ | |
1385 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
32a7627c N |
1386 | return &((bitmap_counter_t *) |
1387 | &bitmap->bp[page].map)[hi]; | |
ef425673 | 1388 | } else /* page is allocated */ |
32a7627c N |
1389 | return (bitmap_counter_t *) |
1390 | &(bitmap->bp[page].map[pageoff]); | |
32a7627c N |
1391 | } |
1392 | ||
e64e4018 | 1393 | int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1394 | { |
ac2f40be N |
1395 | if (!bitmap) |
1396 | return 0; | |
4b6d287f N |
1397 | |
1398 | if (behind) { | |
696fcd53 | 1399 | int bw; |
4b6d287f | 1400 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1401 | bw = atomic_read(&bitmap->behind_writes); |
1402 | if (bw > bitmap->behind_writes_used) | |
1403 | bitmap->behind_writes_used = bw; | |
1404 | ||
36a4e1fe N |
1405 | pr_debug("inc write-behind count %d/%lu\n", |
1406 | bw, bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1407 | } |
1408 | ||
32a7627c | 1409 | while (sectors) { |
57dab0bd | 1410 | sector_t blocks; |
32a7627c N |
1411 | bitmap_counter_t *bmc; |
1412 | ||
40cffcc0 | 1413 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 1414 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 1); |
32a7627c | 1415 | if (!bmc) { |
40cffcc0 | 1416 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1417 | return 0; |
1418 | } | |
1419 | ||
27d5ea04 | 1420 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
da6e1a32 NB |
1421 | DEFINE_WAIT(__wait); |
1422 | /* note that it is safe to do the prepare_to_wait | |
1423 | * after the test as long as we do it before dropping | |
1424 | * the spinlock. | |
1425 | */ | |
1426 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1427 | TASK_UNINTERRUPTIBLE); | |
40cffcc0 | 1428 | spin_unlock_irq(&bitmap->counts.lock); |
f54a9d0e | 1429 | schedule(); |
da6e1a32 NB |
1430 | finish_wait(&bitmap->overflow_wait, &__wait); |
1431 | continue; | |
1432 | } | |
1433 | ||
ac2f40be | 1434 | switch (*bmc) { |
32a7627c | 1435 | case 0: |
e64e4018 AS |
1436 | md_bitmap_file_set_bit(bitmap, offset); |
1437 | md_bitmap_count_page(&bitmap->counts, offset, 1); | |
df561f66 | 1438 | fallthrough; |
32a7627c N |
1439 | case 1: |
1440 | *bmc = 2; | |
1441 | } | |
da6e1a32 | 1442 | |
32a7627c N |
1443 | (*bmc)++; |
1444 | ||
40cffcc0 | 1445 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1446 | |
1447 | offset += blocks; | |
1448 | if (sectors > blocks) | |
1449 | sectors -= blocks; | |
ac2f40be N |
1450 | else |
1451 | sectors = 0; | |
32a7627c N |
1452 | } |
1453 | return 0; | |
1454 | } | |
e64e4018 | 1455 | EXPORT_SYMBOL(md_bitmap_startwrite); |
32a7627c | 1456 | |
e64e4018 AS |
1457 | void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset, |
1458 | unsigned long sectors, int success, int behind) | |
32a7627c | 1459 | { |
ac2f40be N |
1460 | if (!bitmap) |
1461 | return; | |
4b6d287f | 1462 | if (behind) { |
e555190d N |
1463 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1464 | wake_up(&bitmap->behind_wait); | |
36a4e1fe N |
1465 | pr_debug("dec write-behind count %d/%lu\n", |
1466 | atomic_read(&bitmap->behind_writes), | |
1467 | bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1468 | } |
1469 | ||
32a7627c | 1470 | while (sectors) { |
57dab0bd | 1471 | sector_t blocks; |
32a7627c N |
1472 | unsigned long flags; |
1473 | bitmap_counter_t *bmc; | |
1474 | ||
40cffcc0 | 1475 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
e64e4018 | 1476 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 0); |
32a7627c | 1477 | if (!bmc) { |
40cffcc0 | 1478 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1479 | return; |
1480 | } | |
1481 | ||
961902c0 | 1482 | if (success && !bitmap->mddev->degraded && |
a0da84f3 NB |
1483 | bitmap->events_cleared < bitmap->mddev->events) { |
1484 | bitmap->events_cleared = bitmap->mddev->events; | |
1485 | bitmap->need_sync = 1; | |
5ff5afff | 1486 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1487 | } |
1488 | ||
27d5ea04 | 1489 | if (!success && !NEEDED(*bmc)) |
32a7627c N |
1490 | *bmc |= NEEDED_MASK; |
1491 | ||
27d5ea04 | 1492 | if (COUNTER(*bmc) == COUNTER_MAX) |
da6e1a32 NB |
1493 | wake_up(&bitmap->overflow_wait); |
1494 | ||
32a7627c | 1495 | (*bmc)--; |
2585f3ef | 1496 | if (*bmc <= 2) { |
e64e4018 | 1497 | md_bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1498 | bitmap->allclean = 0; |
1499 | } | |
40cffcc0 | 1500 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1501 | offset += blocks; |
1502 | if (sectors > blocks) | |
1503 | sectors -= blocks; | |
ac2f40be N |
1504 | else |
1505 | sectors = 0; | |
32a7627c N |
1506 | } |
1507 | } | |
e64e4018 | 1508 | EXPORT_SYMBOL(md_bitmap_endwrite); |
32a7627c | 1509 | |
57dab0bd | 1510 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a | 1511 | int degraded) |
32a7627c N |
1512 | { |
1513 | bitmap_counter_t *bmc; | |
1514 | int rv; | |
1515 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1516 | *blocks = 1024; | |
1517 | return 1; /* always resync if no bitmap */ | |
1518 | } | |
40cffcc0 | 1519 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 1520 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0); |
32a7627c N |
1521 | rv = 0; |
1522 | if (bmc) { | |
1523 | /* locked */ | |
1524 | if (RESYNC(*bmc)) | |
1525 | rv = 1; | |
1526 | else if (NEEDED(*bmc)) { | |
1527 | rv = 1; | |
6a806c51 N |
1528 | if (!degraded) { /* don't set/clear bits if degraded */ |
1529 | *bmc |= RESYNC_MASK; | |
1530 | *bmc &= ~NEEDED_MASK; | |
1531 | } | |
32a7627c N |
1532 | } |
1533 | } | |
40cffcc0 | 1534 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1535 | return rv; |
1536 | } | |
1537 | ||
e64e4018 AS |
1538 | int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1539 | int degraded) | |
1187cf0a N |
1540 | { |
1541 | /* bitmap_start_sync must always report on multiples of whole | |
1542 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1543 | * get confused. | |
1544 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1545 | * At least PAGE_SIZE>>9 blocks are covered. | |
1546 | * Return the 'or' of the result. | |
1547 | */ | |
1548 | int rv = 0; | |
57dab0bd | 1549 | sector_t blocks1; |
1187cf0a N |
1550 | |
1551 | *blocks = 0; | |
1552 | while (*blocks < (PAGE_SIZE>>9)) { | |
1553 | rv |= __bitmap_start_sync(bitmap, offset, | |
1554 | &blocks1, degraded); | |
1555 | offset += blocks1; | |
1556 | *blocks += blocks1; | |
1557 | } | |
1558 | return rv; | |
1559 | } | |
e64e4018 | 1560 | EXPORT_SYMBOL(md_bitmap_start_sync); |
1187cf0a | 1561 | |
e64e4018 | 1562 | void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
32a7627c N |
1563 | { |
1564 | bitmap_counter_t *bmc; | |
1565 | unsigned long flags; | |
ac2f40be N |
1566 | |
1567 | if (bitmap == NULL) { | |
32a7627c N |
1568 | *blocks = 1024; |
1569 | return; | |
1570 | } | |
40cffcc0 | 1571 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
e64e4018 | 1572 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0); |
32a7627c N |
1573 | if (bmc == NULL) |
1574 | goto unlock; | |
1575 | /* locked */ | |
32a7627c N |
1576 | if (RESYNC(*bmc)) { |
1577 | *bmc &= ~RESYNC_MASK; | |
1578 | ||
1579 | if (!NEEDED(*bmc) && aborted) | |
1580 | *bmc |= NEEDED_MASK; | |
1581 | else { | |
2585f3ef | 1582 | if (*bmc <= 2) { |
e64e4018 | 1583 | md_bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1584 | bitmap->allclean = 0; |
1585 | } | |
32a7627c N |
1586 | } |
1587 | } | |
1588 | unlock: | |
40cffcc0 | 1589 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c | 1590 | } |
e64e4018 | 1591 | EXPORT_SYMBOL(md_bitmap_end_sync); |
32a7627c | 1592 | |
e64e4018 | 1593 | void md_bitmap_close_sync(struct bitmap *bitmap) |
32a7627c N |
1594 | { |
1595 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1596 | * properly have been aborted. It remains to us to clear the | |
1597 | * RESYNC bit wherever it is still on | |
1598 | */ | |
1599 | sector_t sector = 0; | |
57dab0bd | 1600 | sector_t blocks; |
b47490c9 N |
1601 | if (!bitmap) |
1602 | return; | |
32a7627c | 1603 | while (sector < bitmap->mddev->resync_max_sectors) { |
e64e4018 | 1604 | md_bitmap_end_sync(bitmap, sector, &blocks, 0); |
b47490c9 N |
1605 | sector += blocks; |
1606 | } | |
1607 | } | |
e64e4018 | 1608 | EXPORT_SYMBOL(md_bitmap_close_sync); |
b47490c9 | 1609 | |
e64e4018 | 1610 | void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force) |
b47490c9 N |
1611 | { |
1612 | sector_t s = 0; | |
57dab0bd | 1613 | sector_t blocks; |
b47490c9 N |
1614 | |
1615 | if (!bitmap) | |
1616 | return; | |
1617 | if (sector == 0) { | |
1618 | bitmap->last_end_sync = jiffies; | |
1619 | return; | |
1620 | } | |
c40f341f | 1621 | if (!force && time_before(jiffies, (bitmap->last_end_sync |
1b04be96 | 1622 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1623 | return; |
1624 | wait_event(bitmap->mddev->recovery_wait, | |
1625 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1626 | ||
75d3da43 | 1627 | bitmap->mddev->curr_resync_completed = sector; |
2953079c | 1628 | set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags); |
40cffcc0 | 1629 | sector &= ~((1ULL << bitmap->counts.chunkshift) - 1); |
b47490c9 N |
1630 | s = 0; |
1631 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
e64e4018 | 1632 | md_bitmap_end_sync(bitmap, s, &blocks, 0); |
b47490c9 | 1633 | s += blocks; |
32a7627c | 1634 | } |
b47490c9 | 1635 | bitmap->last_end_sync = jiffies; |
e1a86dbb | 1636 | sysfs_notify_dirent_safe(bitmap->mddev->sysfs_completed); |
32a7627c | 1637 | } |
e64e4018 | 1638 | EXPORT_SYMBOL(md_bitmap_cond_end_sync); |
32a7627c | 1639 | |
e64e4018 | 1640 | void md_bitmap_sync_with_cluster(struct mddev *mddev, |
18c9ff7f GJ |
1641 | sector_t old_lo, sector_t old_hi, |
1642 | sector_t new_lo, sector_t new_hi) | |
1643 | { | |
1644 | struct bitmap *bitmap = mddev->bitmap; | |
1645 | sector_t sector, blocks = 0; | |
1646 | ||
1647 | for (sector = old_lo; sector < new_lo; ) { | |
e64e4018 | 1648 | md_bitmap_end_sync(bitmap, sector, &blocks, 0); |
18c9ff7f GJ |
1649 | sector += blocks; |
1650 | } | |
1651 | WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n"); | |
1652 | ||
1653 | for (sector = old_hi; sector < new_hi; ) { | |
e64e4018 | 1654 | md_bitmap_start_sync(bitmap, sector, &blocks, 0); |
18c9ff7f GJ |
1655 | sector += blocks; |
1656 | } | |
1657 | WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n"); | |
1658 | } | |
e64e4018 | 1659 | EXPORT_SYMBOL(md_bitmap_sync_with_cluster); |
18c9ff7f | 1660 | |
e64e4018 | 1661 | static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1662 | { |
1663 | /* For each chunk covered by any of these sectors, set the | |
ef99bf48 | 1664 | * counter to 2 and possibly set resync_needed. They should all |
32a7627c N |
1665 | * be 0 at this point |
1666 | */ | |
193f1c93 | 1667 | |
57dab0bd | 1668 | sector_t secs; |
193f1c93 | 1669 | bitmap_counter_t *bmc; |
40cffcc0 | 1670 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 1671 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, &secs, 1); |
193f1c93 | 1672 | if (!bmc) { |
40cffcc0 | 1673 | spin_unlock_irq(&bitmap->counts.lock); |
193f1c93 | 1674 | return; |
32a7627c | 1675 | } |
ac2f40be | 1676 | if (!*bmc) { |
11dd35da | 1677 | *bmc = 2; |
e64e4018 AS |
1678 | md_bitmap_count_page(&bitmap->counts, offset, 1); |
1679 | md_bitmap_set_pending(&bitmap->counts, offset); | |
2585f3ef | 1680 | bitmap->allclean = 0; |
193f1c93 | 1681 | } |
11dd35da GR |
1682 | if (needed) |
1683 | *bmc |= NEEDED_MASK; | |
40cffcc0 | 1684 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1685 | } |
1686 | ||
9b1d1dac | 1687 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
e64e4018 | 1688 | void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) |
9b1d1dac PC |
1689 | { |
1690 | unsigned long chunk; | |
1691 | ||
1692 | for (chunk = s; chunk <= e; chunk++) { | |
40cffcc0 | 1693 | sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift; |
e64e4018 AS |
1694 | md_bitmap_set_memory_bits(bitmap, sec, 1); |
1695 | md_bitmap_file_set_bit(bitmap, sec); | |
ffa23322 N |
1696 | if (sec < bitmap->mddev->recovery_cp) |
1697 | /* We are asserting that the array is dirty, | |
1698 | * so move the recovery_cp address back so | |
1699 | * that it is obvious that it is dirty | |
1700 | */ | |
1701 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1702 | } |
1703 | } | |
1704 | ||
6b8b3e8a N |
1705 | /* |
1706 | * flush out any pending updates | |
1707 | */ | |
e64e4018 | 1708 | void md_bitmap_flush(struct mddev *mddev) |
6b8b3e8a N |
1709 | { |
1710 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1711 | long sleep; |
6b8b3e8a N |
1712 | |
1713 | if (!bitmap) /* there was no bitmap */ | |
1714 | return; | |
1715 | ||
1716 | /* run the daemon_work three time to ensure everything is flushed | |
1717 | * that can be | |
1718 | */ | |
1b04be96 | 1719 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1720 | bitmap->daemon_lastrun -= sleep; |
e64e4018 | 1721 | md_bitmap_daemon_work(mddev); |
42a04b50 | 1722 | bitmap->daemon_lastrun -= sleep; |
e64e4018 | 1723 | md_bitmap_daemon_work(mddev); |
42a04b50 | 1724 | bitmap->daemon_lastrun -= sleep; |
e64e4018 | 1725 | md_bitmap_daemon_work(mddev); |
404a8ef5 SP |
1726 | if (mddev->bitmap_info.external) |
1727 | md_super_wait(mddev); | |
e64e4018 | 1728 | md_bitmap_update_sb(bitmap); |
6b8b3e8a N |
1729 | } |
1730 | ||
32a7627c N |
1731 | /* |
1732 | * free memory that was allocated | |
1733 | */ | |
e64e4018 | 1734 | void md_bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1735 | { |
1736 | unsigned long k, pages; | |
1737 | struct bitmap_page *bp; | |
32a7627c N |
1738 | |
1739 | if (!bitmap) /* there was no bitmap */ | |
1740 | return; | |
1741 | ||
f9a67b11 GJ |
1742 | if (bitmap->sysfs_can_clear) |
1743 | sysfs_put(bitmap->sysfs_can_clear); | |
1744 | ||
f9209a32 GR |
1745 | if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info && |
1746 | bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev)) | |
b97e9257 GR |
1747 | md_cluster_stop(bitmap->mddev); |
1748 | ||
fae7d326 N |
1749 | /* Shouldn't be needed - but just in case.... */ |
1750 | wait_event(bitmap->write_wait, | |
1751 | atomic_read(&bitmap->pending_writes) == 0); | |
1752 | ||
1753 | /* release the bitmap file */ | |
e64e4018 | 1754 | md_bitmap_file_unmap(&bitmap->storage); |
32a7627c | 1755 | |
40cffcc0 N |
1756 | bp = bitmap->counts.bp; |
1757 | pages = bitmap->counts.pages; | |
32a7627c N |
1758 | |
1759 | /* free all allocated memory */ | |
1760 | ||
32a7627c N |
1761 | if (bp) /* deallocate the page memory */ |
1762 | for (k = 0; k < pages; k++) | |
1763 | if (bp[k].map && !bp[k].hijacked) | |
1764 | kfree(bp[k].map); | |
1765 | kfree(bp); | |
1766 | kfree(bitmap); | |
1767 | } | |
e64e4018 | 1768 | EXPORT_SYMBOL(md_bitmap_free); |
aa5cbd10 | 1769 | |
e64e4018 | 1770 | void md_bitmap_wait_behind_writes(struct mddev *mddev) |
48df498d GJ |
1771 | { |
1772 | struct bitmap *bitmap = mddev->bitmap; | |
1773 | ||
1774 | /* wait for behind writes to complete */ | |
1775 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
1776 | pr_debug("md:%s: behind writes in progress - waiting to stop.\n", | |
1777 | mdname(mddev)); | |
1778 | /* need to kick something here to make sure I/O goes? */ | |
1779 | wait_event(bitmap->behind_wait, | |
1780 | atomic_read(&bitmap->behind_writes) == 0); | |
1781 | } | |
1782 | } | |
1783 | ||
e64e4018 | 1784 | void md_bitmap_destroy(struct mddev *mddev) |
3178b0db N |
1785 | { |
1786 | struct bitmap *bitmap = mddev->bitmap; | |
1787 | ||
1788 | if (!bitmap) /* there was no bitmap */ | |
1789 | return; | |
1790 | ||
e64e4018 | 1791 | md_bitmap_wait_behind_writes(mddev); |
69b00b5b GJ |
1792 | if (!mddev->serialize_policy) |
1793 | mddev_destroy_serial_pool(mddev, NULL, true); | |
48df498d | 1794 | |
c3d9714e | 1795 | mutex_lock(&mddev->bitmap_info.mutex); |
978a7a47 | 1796 | spin_lock(&mddev->lock); |
3178b0db | 1797 | mddev->bitmap = NULL; /* disconnect from the md device */ |
978a7a47 | 1798 | spin_unlock(&mddev->lock); |
c3d9714e | 1799 | mutex_unlock(&mddev->bitmap_info.mutex); |
b15c2e57 N |
1800 | if (mddev->thread) |
1801 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db | 1802 | |
e64e4018 | 1803 | md_bitmap_free(bitmap); |
3178b0db | 1804 | } |
32a7627c N |
1805 | |
1806 | /* | |
1807 | * initialize the bitmap structure | |
1808 | * if this returns an error, bitmap_destroy must be called to do clean up | |
f9a67b11 | 1809 | * once mddev->bitmap is set |
32a7627c | 1810 | */ |
e64e4018 | 1811 | struct bitmap *md_bitmap_create(struct mddev *mddev, int slot) |
32a7627c N |
1812 | { |
1813 | struct bitmap *bitmap; | |
1f593903 | 1814 | sector_t blocks = mddev->resync_max_sectors; |
c3d9714e | 1815 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1816 | int err; |
324a56e1 | 1817 | struct kernfs_node *bm = NULL; |
32a7627c | 1818 | |
5f6e3c83 | 1819 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1820 | |
c3d9714e | 1821 | BUG_ON(file && mddev->bitmap_info.offset); |
a654b9d8 | 1822 | |
230b55fa N |
1823 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
1824 | pr_notice("md/raid:%s: array with journal cannot have bitmap\n", | |
1825 | mdname(mddev)); | |
1826 | return ERR_PTR(-EBUSY); | |
1827 | } | |
1828 | ||
9ffae0cf | 1829 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c | 1830 | if (!bitmap) |
f9209a32 | 1831 | return ERR_PTR(-ENOMEM); |
32a7627c | 1832 | |
40cffcc0 | 1833 | spin_lock_init(&bitmap->counts.lock); |
ce25c31b N |
1834 | atomic_set(&bitmap->pending_writes, 0); |
1835 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1836 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1837 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1838 | |
32a7627c | 1839 | bitmap->mddev = mddev; |
f9209a32 | 1840 | bitmap->cluster_slot = slot; |
32a7627c | 1841 | |
5ff5afff | 1842 | if (mddev->kobj.sd) |
388975cc | 1843 | bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap"); |
ece5cff0 | 1844 | if (bm) { |
388975cc | 1845 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear"); |
ece5cff0 N |
1846 | sysfs_put(bm); |
1847 | } else | |
1848 | bitmap->sysfs_can_clear = NULL; | |
1849 | ||
1ec885cd | 1850 | bitmap->storage.file = file; |
ce25c31b N |
1851 | if (file) { |
1852 | get_file(file); | |
ae8fa283 N |
1853 | /* As future accesses to this file will use bmap, |
1854 | * and bypass the page cache, we must sync the file | |
1855 | * first. | |
1856 | */ | |
8018ab05 | 1857 | vfs_fsync(file, 1); |
ce25c31b | 1858 | } |
42a04b50 | 1859 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
9c81075f JB |
1860 | if (!mddev->bitmap_info.external) { |
1861 | /* | |
1862 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is | |
1863 | * instructing us to create a new on-disk bitmap instance. | |
1864 | */ | |
1865 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) | |
e64e4018 | 1866 | err = md_bitmap_new_disk_sb(bitmap); |
9c81075f | 1867 | else |
e64e4018 | 1868 | err = md_bitmap_read_sb(bitmap); |
9c81075f | 1869 | } else { |
ece5cff0 N |
1870 | err = 0; |
1871 | if (mddev->bitmap_info.chunksize == 0 || | |
1872 | mddev->bitmap_info.daemon_sleep == 0) | |
1873 | /* chunksize and time_base need to be | |
1874 | * set first. */ | |
1875 | err = -EINVAL; | |
1876 | } | |
32a7627c | 1877 | if (err) |
3178b0db | 1878 | goto error; |
32a7627c | 1879 | |
624ce4f5 | 1880 | bitmap->daemon_lastrun = jiffies; |
e64e4018 | 1881 | err = md_bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1); |
d60b479d | 1882 | if (err) |
3178b0db | 1883 | goto error; |
32a7627c | 1884 | |
ec0cc226 N |
1885 | pr_debug("created bitmap (%lu pages) for device %s\n", |
1886 | bitmap->counts.pages, bmname(bitmap)); | |
69e51b44 | 1887 | |
f9209a32 GR |
1888 | err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0; |
1889 | if (err) | |
1890 | goto error; | |
69e51b44 | 1891 | |
f9209a32 | 1892 | return bitmap; |
69e51b44 | 1893 | error: |
e64e4018 | 1894 | md_bitmap_free(bitmap); |
f9209a32 | 1895 | return ERR_PTR(err); |
69e51b44 N |
1896 | } |
1897 | ||
e64e4018 | 1898 | int md_bitmap_load(struct mddev *mddev) |
69e51b44 N |
1899 | { |
1900 | int err = 0; | |
3520fa4d | 1901 | sector_t start = 0; |
69e51b44 N |
1902 | sector_t sector = 0; |
1903 | struct bitmap *bitmap = mddev->bitmap; | |
617b194a | 1904 | struct md_rdev *rdev; |
69e51b44 N |
1905 | |
1906 | if (!bitmap) | |
1907 | goto out; | |
1908 | ||
617b194a | 1909 | rdev_for_each(rdev, mddev) |
404659cf | 1910 | mddev_create_serial_pool(mddev, rdev, true); |
617b194a | 1911 | |
51e453ae GJ |
1912 | if (mddev_is_clustered(mddev)) |
1913 | md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes); | |
1914 | ||
69e51b44 N |
1915 | /* Clear out old bitmap info first: Either there is none, or we |
1916 | * are resuming after someone else has possibly changed things, | |
1917 | * so we should forget old cached info. | |
1918 | * All chunks should be clean, but some might need_sync. | |
1919 | */ | |
1920 | while (sector < mddev->resync_max_sectors) { | |
57dab0bd | 1921 | sector_t blocks; |
e64e4018 | 1922 | md_bitmap_start_sync(bitmap, sector, &blocks, 0); |
69e51b44 N |
1923 | sector += blocks; |
1924 | } | |
e64e4018 | 1925 | md_bitmap_close_sync(bitmap); |
69e51b44 | 1926 | |
3520fa4d JB |
1927 | if (mddev->degraded == 0 |
1928 | || bitmap->events_cleared == mddev->events) | |
1929 | /* no need to keep dirty bits to optimise a | |
1930 | * re-add of a missing device */ | |
1931 | start = mddev->recovery_cp; | |
1932 | ||
afbaa90b | 1933 | mutex_lock(&mddev->bitmap_info.mutex); |
e64e4018 | 1934 | err = md_bitmap_init_from_disk(bitmap, start); |
afbaa90b | 1935 | mutex_unlock(&mddev->bitmap_info.mutex); |
3520fa4d | 1936 | |
32a7627c | 1937 | if (err) |
69e51b44 | 1938 | goto out; |
b405fe91 | 1939 | clear_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
1940 | |
1941 | /* Kick recovery in case any bits were set */ | |
1942 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
3178b0db | 1943 | |
1b04be96 | 1944 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
9cd30fdc | 1945 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 1946 | |
e64e4018 | 1947 | md_bitmap_update_sb(bitmap); |
4ad13663 | 1948 | |
b405fe91 | 1949 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
69e51b44 N |
1950 | err = -EIO; |
1951 | out: | |
3178b0db | 1952 | return err; |
32a7627c | 1953 | } |
e64e4018 | 1954 | EXPORT_SYMBOL_GPL(md_bitmap_load); |
32a7627c | 1955 | |
1383b347 | 1956 | /* caller need to free returned bitmap with md_bitmap_free() */ |
b98938d1 GJ |
1957 | struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot) |
1958 | { | |
1959 | int rv = 0; | |
1960 | struct bitmap *bitmap; | |
1961 | ||
e64e4018 | 1962 | bitmap = md_bitmap_create(mddev, slot); |
b98938d1 GJ |
1963 | if (IS_ERR(bitmap)) { |
1964 | rv = PTR_ERR(bitmap); | |
1965 | return ERR_PTR(rv); | |
1966 | } | |
1967 | ||
e64e4018 | 1968 | rv = md_bitmap_init_from_disk(bitmap, 0); |
b98938d1 | 1969 | if (rv) { |
e64e4018 | 1970 | md_bitmap_free(bitmap); |
b98938d1 GJ |
1971 | return ERR_PTR(rv); |
1972 | } | |
1973 | ||
1974 | return bitmap; | |
1975 | } | |
1976 | EXPORT_SYMBOL(get_bitmap_from_slot); | |
1977 | ||
11dd35da GR |
1978 | /* Loads the bitmap associated with slot and copies the resync information |
1979 | * to our bitmap | |
1980 | */ | |
e64e4018 | 1981 | int md_bitmap_copy_from_slot(struct mddev *mddev, int slot, |
97f6cd39 | 1982 | sector_t *low, sector_t *high, bool clear_bits) |
11dd35da GR |
1983 | { |
1984 | int rv = 0, i, j; | |
1985 | sector_t block, lo = 0, hi = 0; | |
1986 | struct bitmap_counts *counts; | |
b98938d1 | 1987 | struct bitmap *bitmap; |
11dd35da | 1988 | |
b98938d1 GJ |
1989 | bitmap = get_bitmap_from_slot(mddev, slot); |
1990 | if (IS_ERR(bitmap)) { | |
1991 | pr_err("%s can't get bitmap from slot %d\n", __func__, slot); | |
1992 | return -1; | |
1993 | } | |
11dd35da GR |
1994 | |
1995 | counts = &bitmap->counts; | |
1996 | for (j = 0; j < counts->chunks; j++) { | |
1997 | block = (sector_t)j << counts->chunkshift; | |
e64e4018 | 1998 | if (md_bitmap_file_test_bit(bitmap, block)) { |
11dd35da GR |
1999 | if (!lo) |
2000 | lo = block; | |
2001 | hi = block; | |
e64e4018 AS |
2002 | md_bitmap_file_clear_bit(bitmap, block); |
2003 | md_bitmap_set_memory_bits(mddev->bitmap, block, 1); | |
2004 | md_bitmap_file_set_bit(mddev->bitmap, block); | |
11dd35da GR |
2005 | } |
2006 | } | |
2007 | ||
97f6cd39 | 2008 | if (clear_bits) { |
e64e4018 | 2009 | md_bitmap_update_sb(bitmap); |
c84400c8 GJ |
2010 | /* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs |
2011 | * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */ | |
97f6cd39 | 2012 | for (i = 0; i < bitmap->storage.file_pages; i++) |
c84400c8 GJ |
2013 | if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING)) |
2014 | set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); | |
e64e4018 | 2015 | md_bitmap_unplug(bitmap); |
97f6cd39 | 2016 | } |
e64e4018 | 2017 | md_bitmap_unplug(mddev->bitmap); |
11dd35da GR |
2018 | *low = lo; |
2019 | *high = hi; | |
1383b347 | 2020 | md_bitmap_free(bitmap); |
b98938d1 | 2021 | |
11dd35da GR |
2022 | return rv; |
2023 | } | |
e64e4018 | 2024 | EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot); |
11dd35da GR |
2025 | |
2026 | ||
e64e4018 | 2027 | void md_bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
57148964 N |
2028 | { |
2029 | unsigned long chunk_kb; | |
40cffcc0 | 2030 | struct bitmap_counts *counts; |
57148964 N |
2031 | |
2032 | if (!bitmap) | |
2033 | return; | |
2034 | ||
40cffcc0 N |
2035 | counts = &bitmap->counts; |
2036 | ||
57148964 N |
2037 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; |
2038 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
2039 | "%lu%s chunk", | |
40cffcc0 N |
2040 | counts->pages - counts->missing_pages, |
2041 | counts->pages, | |
2042 | (counts->pages - counts->missing_pages) | |
57148964 N |
2043 | << (PAGE_SHIFT - 10), |
2044 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, | |
2045 | chunk_kb ? "KB" : "B"); | |
1ec885cd | 2046 | if (bitmap->storage.file) { |
57148964 | 2047 | seq_printf(seq, ", file: "); |
2726d566 | 2048 | seq_file_path(seq, bitmap->storage.file, " \t\n"); |
57148964 N |
2049 | } |
2050 | ||
2051 | seq_printf(seq, "\n"); | |
57148964 N |
2052 | } |
2053 | ||
e64e4018 | 2054 | int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks, |
d60b479d N |
2055 | int chunksize, int init) |
2056 | { | |
2057 | /* If chunk_size is 0, choose an appropriate chunk size. | |
2058 | * Then possibly allocate new storage space. | |
2059 | * Then quiesce, copy bits, replace bitmap, and re-start | |
2060 | * | |
2061 | * This function is called both to set up the initial bitmap | |
2062 | * and to resize the bitmap while the array is active. | |
2063 | * If this happens as a result of the array being resized, | |
2064 | * chunksize will be zero, and we need to choose a suitable | |
2065 | * chunksize, otherwise we use what we are given. | |
2066 | */ | |
2067 | struct bitmap_storage store; | |
2068 | struct bitmap_counts old_counts; | |
2069 | unsigned long chunks; | |
2070 | sector_t block; | |
2071 | sector_t old_blocks, new_blocks; | |
2072 | int chunkshift; | |
2073 | int ret = 0; | |
2074 | long pages; | |
2075 | struct bitmap_page *new_bp; | |
2076 | ||
e8a27f83 N |
2077 | if (bitmap->storage.file && !init) { |
2078 | pr_info("md: cannot resize file-based bitmap\n"); | |
2079 | return -EINVAL; | |
2080 | } | |
2081 | ||
d60b479d N |
2082 | if (chunksize == 0) { |
2083 | /* If there is enough space, leave the chunk size unchanged, | |
2084 | * else increase by factor of two until there is enough space. | |
2085 | */ | |
2086 | long bytes; | |
2087 | long space = bitmap->mddev->bitmap_info.space; | |
2088 | ||
2089 | if (space == 0) { | |
2090 | /* We don't know how much space there is, so limit | |
2091 | * to current size - in sectors. | |
2092 | */ | |
2093 | bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8); | |
2094 | if (!bitmap->mddev->bitmap_info.external) | |
2095 | bytes += sizeof(bitmap_super_t); | |
2096 | space = DIV_ROUND_UP(bytes, 512); | |
2097 | bitmap->mddev->bitmap_info.space = space; | |
2098 | } | |
2099 | chunkshift = bitmap->counts.chunkshift; | |
2100 | chunkshift--; | |
2101 | do { | |
2102 | /* 'chunkshift' is shift from block size to chunk size */ | |
2103 | chunkshift++; | |
2104 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
2105 | bytes = DIV_ROUND_UP(chunks, 8); | |
2106 | if (!bitmap->mddev->bitmap_info.external) | |
2107 | bytes += sizeof(bitmap_super_t); | |
2108 | } while (bytes > (space << 9)); | |
2109 | } else | |
2110 | chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT; | |
2111 | ||
2112 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
2113 | memset(&store, 0, sizeof(store)); | |
2114 | if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file) | |
e64e4018 AS |
2115 | ret = md_bitmap_storage_alloc(&store, chunks, |
2116 | !bitmap->mddev->bitmap_info.external, | |
2117 | mddev_is_clustered(bitmap->mddev) | |
2118 | ? bitmap->cluster_slot : 0); | |
cbb38732 | 2119 | if (ret) { |
e64e4018 | 2120 | md_bitmap_file_unmap(&store); |
d60b479d | 2121 | goto err; |
cbb38732 | 2122 | } |
d60b479d N |
2123 | |
2124 | pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO); | |
2125 | ||
6396bb22 | 2126 | new_bp = kcalloc(pages, sizeof(*new_bp), GFP_KERNEL); |
d60b479d N |
2127 | ret = -ENOMEM; |
2128 | if (!new_bp) { | |
e64e4018 | 2129 | md_bitmap_file_unmap(&store); |
d60b479d N |
2130 | goto err; |
2131 | } | |
2132 | ||
2133 | if (!init) | |
2134 | bitmap->mddev->pers->quiesce(bitmap->mddev, 1); | |
2135 | ||
2136 | store.file = bitmap->storage.file; | |
2137 | bitmap->storage.file = NULL; | |
2138 | ||
2139 | if (store.sb_page && bitmap->storage.sb_page) | |
2140 | memcpy(page_address(store.sb_page), | |
2141 | page_address(bitmap->storage.sb_page), | |
938b533d | 2142 | sizeof(bitmap_super_t)); |
fadcbd29 | 2143 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 2144 | md_bitmap_file_unmap(&bitmap->storage); |
d60b479d N |
2145 | bitmap->storage = store; |
2146 | ||
2147 | old_counts = bitmap->counts; | |
2148 | bitmap->counts.bp = new_bp; | |
2149 | bitmap->counts.pages = pages; | |
2150 | bitmap->counts.missing_pages = pages; | |
2151 | bitmap->counts.chunkshift = chunkshift; | |
2152 | bitmap->counts.chunks = chunks; | |
2153 | bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift + | |
2154 | BITMAP_BLOCK_SHIFT); | |
2155 | ||
2156 | blocks = min(old_counts.chunks << old_counts.chunkshift, | |
2157 | chunks << chunkshift); | |
2158 | ||
c9d65032 GJ |
2159 | /* For cluster raid, need to pre-allocate bitmap */ |
2160 | if (mddev_is_clustered(bitmap->mddev)) { | |
2161 | unsigned long page; | |
2162 | for (page = 0; page < pages; page++) { | |
e64e4018 | 2163 | ret = md_bitmap_checkpage(&bitmap->counts, page, 1, 1); |
c9d65032 GJ |
2164 | if (ret) { |
2165 | unsigned long k; | |
2166 | ||
2167 | /* deallocate the page memory */ | |
2168 | for (k = 0; k < page; k++) { | |
bc47e842 | 2169 | kfree(new_bp[k].map); |
c9d65032 | 2170 | } |
0868b99c | 2171 | kfree(new_bp); |
c9d65032 GJ |
2172 | |
2173 | /* restore some fields from old_counts */ | |
2174 | bitmap->counts.bp = old_counts.bp; | |
2175 | bitmap->counts.pages = old_counts.pages; | |
2176 | bitmap->counts.missing_pages = old_counts.pages; | |
2177 | bitmap->counts.chunkshift = old_counts.chunkshift; | |
2178 | bitmap->counts.chunks = old_counts.chunks; | |
2179 | bitmap->mddev->bitmap_info.chunksize = 1 << (old_counts.chunkshift + | |
2180 | BITMAP_BLOCK_SHIFT); | |
2181 | blocks = old_counts.chunks << old_counts.chunkshift; | |
ec0cc226 | 2182 | pr_warn("Could not pre-allocate in-memory bitmap for cluster raid\n"); |
c9d65032 GJ |
2183 | break; |
2184 | } else | |
2185 | bitmap->counts.bp[page].count += 1; | |
2186 | } | |
2187 | } | |
2188 | ||
d60b479d N |
2189 | for (block = 0; block < blocks; ) { |
2190 | bitmap_counter_t *bmc_old, *bmc_new; | |
2191 | int set; | |
2192 | ||
e64e4018 | 2193 | bmc_old = md_bitmap_get_counter(&old_counts, block, &old_blocks, 0); |
d60b479d N |
2194 | set = bmc_old && NEEDED(*bmc_old); |
2195 | ||
2196 | if (set) { | |
e64e4018 | 2197 | bmc_new = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1); |
d60b479d N |
2198 | if (*bmc_new == 0) { |
2199 | /* need to set on-disk bits too. */ | |
2200 | sector_t end = block + new_blocks; | |
2201 | sector_t start = block >> chunkshift; | |
2202 | start <<= chunkshift; | |
2203 | while (start < end) { | |
e64e4018 | 2204 | md_bitmap_file_set_bit(bitmap, block); |
d60b479d N |
2205 | start += 1 << chunkshift; |
2206 | } | |
2207 | *bmc_new = 2; | |
e64e4018 AS |
2208 | md_bitmap_count_page(&bitmap->counts, block, 1); |
2209 | md_bitmap_set_pending(&bitmap->counts, block); | |
d60b479d N |
2210 | } |
2211 | *bmc_new |= NEEDED_MASK; | |
2212 | if (new_blocks < old_blocks) | |
2213 | old_blocks = new_blocks; | |
2214 | } | |
2215 | block += old_blocks; | |
2216 | } | |
2217 | ||
0868b99c ZK |
2218 | if (bitmap->counts.bp != old_counts.bp) { |
2219 | unsigned long k; | |
2220 | for (k = 0; k < old_counts.pages; k++) | |
2221 | if (!old_counts.bp[k].hijacked) | |
2222 | kfree(old_counts.bp[k].map); | |
2223 | kfree(old_counts.bp); | |
2224 | } | |
2225 | ||
d60b479d N |
2226 | if (!init) { |
2227 | int i; | |
2228 | while (block < (chunks << chunkshift)) { | |
2229 | bitmap_counter_t *bmc; | |
e64e4018 | 2230 | bmc = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1); |
d60b479d N |
2231 | if (bmc) { |
2232 | /* new space. It needs to be resynced, so | |
2233 | * we set NEEDED_MASK. | |
2234 | */ | |
2235 | if (*bmc == 0) { | |
2236 | *bmc = NEEDED_MASK | 2; | |
e64e4018 AS |
2237 | md_bitmap_count_page(&bitmap->counts, block, 1); |
2238 | md_bitmap_set_pending(&bitmap->counts, block); | |
d60b479d N |
2239 | } |
2240 | } | |
2241 | block += new_blocks; | |
2242 | } | |
2243 | for (i = 0; i < bitmap->storage.file_pages; i++) | |
2244 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); | |
2245 | } | |
2246 | spin_unlock_irq(&bitmap->counts.lock); | |
2247 | ||
2248 | if (!init) { | |
e64e4018 | 2249 | md_bitmap_unplug(bitmap); |
d60b479d N |
2250 | bitmap->mddev->pers->quiesce(bitmap->mddev, 0); |
2251 | } | |
2252 | ret = 0; | |
2253 | err: | |
2254 | return ret; | |
2255 | } | |
e64e4018 | 2256 | EXPORT_SYMBOL_GPL(md_bitmap_resize); |
d60b479d | 2257 | |
43a70507 | 2258 | static ssize_t |
fd01b88c | 2259 | location_show(struct mddev *mddev, char *page) |
43a70507 N |
2260 | { |
2261 | ssize_t len; | |
ac2f40be | 2262 | if (mddev->bitmap_info.file) |
43a70507 | 2263 | len = sprintf(page, "file"); |
ac2f40be | 2264 | else if (mddev->bitmap_info.offset) |
43a70507 | 2265 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 2266 | else |
43a70507 N |
2267 | len = sprintf(page, "none"); |
2268 | len += sprintf(page+len, "\n"); | |
2269 | return len; | |
2270 | } | |
2271 | ||
2272 | static ssize_t | |
fd01b88c | 2273 | location_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 | 2274 | { |
d9dd26b2 | 2275 | int rv; |
43a70507 | 2276 | |
d9dd26b2 SL |
2277 | rv = mddev_lock(mddev); |
2278 | if (rv) | |
2279 | return rv; | |
43a70507 | 2280 | if (mddev->pers) { |
d9dd26b2 SL |
2281 | if (!mddev->pers->quiesce) { |
2282 | rv = -EBUSY; | |
2283 | goto out; | |
2284 | } | |
2285 | if (mddev->recovery || mddev->sync_thread) { | |
2286 | rv = -EBUSY; | |
2287 | goto out; | |
2288 | } | |
43a70507 N |
2289 | } |
2290 | ||
2291 | if (mddev->bitmap || mddev->bitmap_info.file || | |
2292 | mddev->bitmap_info.offset) { | |
2293 | /* bitmap already configured. Only option is to clear it */ | |
d9dd26b2 SL |
2294 | if (strncmp(buf, "none", 4) != 0) { |
2295 | rv = -EBUSY; | |
2296 | goto out; | |
2297 | } | |
43a70507 | 2298 | if (mddev->pers) { |
f8f83d8f | 2299 | mddev_suspend(mddev); |
e64e4018 | 2300 | md_bitmap_destroy(mddev); |
f8f83d8f | 2301 | mddev_resume(mddev); |
43a70507 N |
2302 | } |
2303 | mddev->bitmap_info.offset = 0; | |
2304 | if (mddev->bitmap_info.file) { | |
2305 | struct file *f = mddev->bitmap_info.file; | |
2306 | mddev->bitmap_info.file = NULL; | |
43a70507 N |
2307 | fput(f); |
2308 | } | |
2309 | } else { | |
2310 | /* No bitmap, OK to set a location */ | |
2311 | long long offset; | |
2312 | if (strncmp(buf, "none", 4) == 0) | |
2313 | /* nothing to be done */; | |
2314 | else if (strncmp(buf, "file:", 5) == 0) { | |
2315 | /* Not supported yet */ | |
d9dd26b2 SL |
2316 | rv = -EINVAL; |
2317 | goto out; | |
43a70507 | 2318 | } else { |
43a70507 | 2319 | if (buf[0] == '+') |
b29bebd6 | 2320 | rv = kstrtoll(buf+1, 10, &offset); |
43a70507 | 2321 | else |
b29bebd6 | 2322 | rv = kstrtoll(buf, 10, &offset); |
43a70507 | 2323 | if (rv) |
d9dd26b2 SL |
2324 | goto out; |
2325 | if (offset == 0) { | |
2326 | rv = -EINVAL; | |
2327 | goto out; | |
2328 | } | |
ece5cff0 N |
2329 | if (mddev->bitmap_info.external == 0 && |
2330 | mddev->major_version == 0 && | |
d9dd26b2 SL |
2331 | offset != mddev->bitmap_info.default_offset) { |
2332 | rv = -EINVAL; | |
2333 | goto out; | |
2334 | } | |
43a70507 N |
2335 | mddev->bitmap_info.offset = offset; |
2336 | if (mddev->pers) { | |
f9209a32 | 2337 | struct bitmap *bitmap; |
e64e4018 | 2338 | bitmap = md_bitmap_create(mddev, -1); |
f8f83d8f | 2339 | mddev_suspend(mddev); |
f9209a32 GR |
2340 | if (IS_ERR(bitmap)) |
2341 | rv = PTR_ERR(bitmap); | |
2342 | else { | |
2343 | mddev->bitmap = bitmap; | |
e64e4018 | 2344 | rv = md_bitmap_load(mddev); |
f9a67b11 | 2345 | if (rv) |
f9209a32 | 2346 | mddev->bitmap_info.offset = 0; |
43a70507 | 2347 | } |
f9a67b11 | 2348 | if (rv) { |
e64e4018 | 2349 | md_bitmap_destroy(mddev); |
f8f83d8f | 2350 | mddev_resume(mddev); |
d9dd26b2 | 2351 | goto out; |
f9a67b11 | 2352 | } |
f8f83d8f | 2353 | mddev_resume(mddev); |
43a70507 N |
2354 | } |
2355 | } | |
2356 | } | |
2357 | if (!mddev->external) { | |
2358 | /* Ensure new bitmap info is stored in | |
2359 | * metadata promptly. | |
2360 | */ | |
2953079c | 2361 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
43a70507 N |
2362 | md_wakeup_thread(mddev->thread); |
2363 | } | |
d9dd26b2 SL |
2364 | rv = 0; |
2365 | out: | |
2366 | mddev_unlock(mddev); | |
2367 | if (rv) | |
2368 | return rv; | |
43a70507 N |
2369 | return len; |
2370 | } | |
2371 | ||
2372 | static struct md_sysfs_entry bitmap_location = | |
2373 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
2374 | ||
6409bb05 N |
2375 | /* 'bitmap/space' is the space available at 'location' for the |
2376 | * bitmap. This allows the kernel to know when it is safe to | |
2377 | * resize the bitmap to match a resized array. | |
2378 | */ | |
2379 | static ssize_t | |
2380 | space_show(struct mddev *mddev, char *page) | |
2381 | { | |
2382 | return sprintf(page, "%lu\n", mddev->bitmap_info.space); | |
2383 | } | |
2384 | ||
2385 | static ssize_t | |
2386 | space_store(struct mddev *mddev, const char *buf, size_t len) | |
2387 | { | |
2388 | unsigned long sectors; | |
2389 | int rv; | |
2390 | ||
2391 | rv = kstrtoul(buf, 10, §ors); | |
2392 | if (rv) | |
2393 | return rv; | |
2394 | ||
2395 | if (sectors == 0) | |
2396 | return -EINVAL; | |
2397 | ||
2398 | if (mddev->bitmap && | |
9b1215c1 | 2399 | sectors < (mddev->bitmap->storage.bytes + 511) >> 9) |
6409bb05 N |
2400 | return -EFBIG; /* Bitmap is too big for this small space */ |
2401 | ||
2402 | /* could make sure it isn't too big, but that isn't really | |
2403 | * needed - user-space should be careful. | |
2404 | */ | |
2405 | mddev->bitmap_info.space = sectors; | |
2406 | return len; | |
2407 | } | |
2408 | ||
2409 | static struct md_sysfs_entry bitmap_space = | |
2410 | __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); | |
2411 | ||
43a70507 | 2412 | static ssize_t |
fd01b88c | 2413 | timeout_show(struct mddev *mddev, char *page) |
43a70507 N |
2414 | { |
2415 | ssize_t len; | |
2416 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
2417 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 2418 | |
43a70507 N |
2419 | len = sprintf(page, "%lu", secs); |
2420 | if (jifs) | |
2421 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
2422 | len += sprintf(page+len, "\n"); | |
2423 | return len; | |
2424 | } | |
2425 | ||
2426 | static ssize_t | |
fd01b88c | 2427 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2428 | { |
2429 | /* timeout can be set at any time */ | |
2430 | unsigned long timeout; | |
2431 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
2432 | if (rv) | |
2433 | return rv; | |
2434 | ||
2435 | /* just to make sure we don't overflow... */ | |
2436 | if (timeout >= LONG_MAX / HZ) | |
2437 | return -EINVAL; | |
2438 | ||
2439 | timeout = timeout * HZ / 10000; | |
2440 | ||
2441 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
2442 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
2443 | if (timeout < 1) | |
2444 | timeout = 1; | |
2445 | mddev->bitmap_info.daemon_sleep = timeout; | |
2446 | if (mddev->thread) { | |
2447 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then | |
2448 | * the bitmap is all clean and we don't need to | |
2449 | * adjust the timeout right now | |
2450 | */ | |
2451 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { | |
2452 | mddev->thread->timeout = timeout; | |
2453 | md_wakeup_thread(mddev->thread); | |
2454 | } | |
2455 | } | |
2456 | return len; | |
2457 | } | |
2458 | ||
2459 | static struct md_sysfs_entry bitmap_timeout = | |
2460 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
2461 | ||
2462 | static ssize_t | |
fd01b88c | 2463 | backlog_show(struct mddev *mddev, char *page) |
43a70507 N |
2464 | { |
2465 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
2466 | } | |
2467 | ||
2468 | static ssize_t | |
fd01b88c | 2469 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2470 | { |
2471 | unsigned long backlog; | |
10c92fca | 2472 | unsigned long old_mwb = mddev->bitmap_info.max_write_behind; |
8c13ab11 GJ |
2473 | struct md_rdev *rdev; |
2474 | bool has_write_mostly = false; | |
b29bebd6 | 2475 | int rv = kstrtoul(buf, 10, &backlog); |
43a70507 N |
2476 | if (rv) |
2477 | return rv; | |
2478 | if (backlog > COUNTER_MAX) | |
2479 | return -EINVAL; | |
8c13ab11 GJ |
2480 | |
2481 | /* | |
2482 | * Without write mostly device, it doesn't make sense to set | |
2483 | * backlog for max_write_behind. | |
2484 | */ | |
2485 | rdev_for_each(rdev, mddev) { | |
2486 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2487 | has_write_mostly = true; | |
2488 | break; | |
2489 | } | |
2490 | } | |
2491 | if (!has_write_mostly) { | |
2492 | pr_warn_ratelimited("%s: can't set backlog, no write mostly device available\n", | |
2493 | mdname(mddev)); | |
2494 | return -EINVAL; | |
2495 | } | |
2496 | ||
43a70507 | 2497 | mddev->bitmap_info.max_write_behind = backlog; |
404659cf GJ |
2498 | if (!backlog && mddev->serial_info_pool) { |
2499 | /* serial_info_pool is not needed if backlog is zero */ | |
69b00b5b GJ |
2500 | if (!mddev->serialize_policy) |
2501 | mddev_destroy_serial_pool(mddev, NULL, false); | |
404659cf GJ |
2502 | } else if (backlog && !mddev->serial_info_pool) { |
2503 | /* serial_info_pool is needed since backlog is not zero */ | |
10c92fca GJ |
2504 | struct md_rdev *rdev; |
2505 | ||
2506 | rdev_for_each(rdev, mddev) | |
404659cf | 2507 | mddev_create_serial_pool(mddev, rdev, false); |
10c92fca GJ |
2508 | } |
2509 | if (old_mwb != backlog) | |
2510 | md_bitmap_update_sb(mddev->bitmap); | |
43a70507 N |
2511 | return len; |
2512 | } | |
2513 | ||
2514 | static struct md_sysfs_entry bitmap_backlog = | |
2515 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
2516 | ||
2517 | static ssize_t | |
fd01b88c | 2518 | chunksize_show(struct mddev *mddev, char *page) |
43a70507 N |
2519 | { |
2520 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
2521 | } | |
2522 | ||
2523 | static ssize_t | |
fd01b88c | 2524 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2525 | { |
2526 | /* Can only be changed when no bitmap is active */ | |
2527 | int rv; | |
2528 | unsigned long csize; | |
2529 | if (mddev->bitmap) | |
2530 | return -EBUSY; | |
b29bebd6 | 2531 | rv = kstrtoul(buf, 10, &csize); |
43a70507 N |
2532 | if (rv) |
2533 | return rv; | |
2534 | if (csize < 512 || | |
2535 | !is_power_of_2(csize)) | |
2536 | return -EINVAL; | |
2537 | mddev->bitmap_info.chunksize = csize; | |
2538 | return len; | |
2539 | } | |
2540 | ||
2541 | static struct md_sysfs_entry bitmap_chunksize = | |
2542 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
2543 | ||
fd01b88c | 2544 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
ece5cff0 | 2545 | { |
c4ce867f GR |
2546 | if (mddev_is_clustered(mddev)) |
2547 | return sprintf(page, "clustered\n"); | |
ece5cff0 N |
2548 | return sprintf(page, "%s\n", (mddev->bitmap_info.external |
2549 | ? "external" : "internal")); | |
2550 | } | |
2551 | ||
fd01b88c | 2552 | static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2553 | { |
2554 | if (mddev->bitmap || | |
2555 | mddev->bitmap_info.file || | |
2556 | mddev->bitmap_info.offset) | |
2557 | return -EBUSY; | |
2558 | if (strncmp(buf, "external", 8) == 0) | |
2559 | mddev->bitmap_info.external = 1; | |
c4ce867f GR |
2560 | else if ((strncmp(buf, "internal", 8) == 0) || |
2561 | (strncmp(buf, "clustered", 9) == 0)) | |
ece5cff0 N |
2562 | mddev->bitmap_info.external = 0; |
2563 | else | |
2564 | return -EINVAL; | |
2565 | return len; | |
2566 | } | |
2567 | ||
2568 | static struct md_sysfs_entry bitmap_metadata = | |
2569 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
2570 | ||
fd01b88c | 2571 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
ece5cff0 N |
2572 | { |
2573 | int len; | |
b7b17c9b | 2574 | spin_lock(&mddev->lock); |
ece5cff0 N |
2575 | if (mddev->bitmap) |
2576 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
2577 | "false" : "true")); | |
2578 | else | |
2579 | len = sprintf(page, "\n"); | |
b7b17c9b | 2580 | spin_unlock(&mddev->lock); |
ece5cff0 N |
2581 | return len; |
2582 | } | |
2583 | ||
fd01b88c | 2584 | static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2585 | { |
2586 | if (mddev->bitmap == NULL) | |
2587 | return -ENOENT; | |
2588 | if (strncmp(buf, "false", 5) == 0) | |
2589 | mddev->bitmap->need_sync = 1; | |
2590 | else if (strncmp(buf, "true", 4) == 0) { | |
2591 | if (mddev->degraded) | |
2592 | return -EBUSY; | |
2593 | mddev->bitmap->need_sync = 0; | |
2594 | } else | |
2595 | return -EINVAL; | |
2596 | return len; | |
2597 | } | |
2598 | ||
2599 | static struct md_sysfs_entry bitmap_can_clear = | |
2600 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
2601 | ||
696fcd53 | 2602 | static ssize_t |
fd01b88c | 2603 | behind_writes_used_show(struct mddev *mddev, char *page) |
696fcd53 | 2604 | { |
b7b17c9b N |
2605 | ssize_t ret; |
2606 | spin_lock(&mddev->lock); | |
696fcd53 | 2607 | if (mddev->bitmap == NULL) |
b7b17c9b N |
2608 | ret = sprintf(page, "0\n"); |
2609 | else | |
2610 | ret = sprintf(page, "%lu\n", | |
2611 | mddev->bitmap->behind_writes_used); | |
2612 | spin_unlock(&mddev->lock); | |
2613 | return ret; | |
696fcd53 PC |
2614 | } |
2615 | ||
2616 | static ssize_t | |
fd01b88c | 2617 | behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) |
696fcd53 PC |
2618 | { |
2619 | if (mddev->bitmap) | |
2620 | mddev->bitmap->behind_writes_used = 0; | |
2621 | return len; | |
2622 | } | |
2623 | ||
2624 | static struct md_sysfs_entry max_backlog_used = | |
2625 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2626 | behind_writes_used_show, behind_writes_used_reset); | |
2627 | ||
43a70507 N |
2628 | static struct attribute *md_bitmap_attrs[] = { |
2629 | &bitmap_location.attr, | |
6409bb05 | 2630 | &bitmap_space.attr, |
43a70507 N |
2631 | &bitmap_timeout.attr, |
2632 | &bitmap_backlog.attr, | |
2633 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2634 | &bitmap_metadata.attr, |
2635 | &bitmap_can_clear.attr, | |
696fcd53 | 2636 | &max_backlog_used.attr, |
43a70507 N |
2637 | NULL |
2638 | }; | |
c32dc040 | 2639 | const struct attribute_group md_bitmap_group = { |
43a70507 N |
2640 | .name = "bitmap", |
2641 | .attrs = md_bitmap_attrs, | |
2642 | }; |