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Commit | Line | Data |
---|---|---|
32a7627c N |
1 | /* |
2 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 | |
3 | * | |
4 | * bitmap_create - sets up the bitmap structure | |
5 | * bitmap_destroy - destroys the bitmap structure | |
6 | * | |
7 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: | |
8 | * - added disk storage for bitmap | |
9 | * - changes to allow various bitmap chunk sizes | |
32a7627c N |
10 | */ |
11 | ||
12 | /* | |
13 | * Still to do: | |
14 | * | |
15 | * flush after percent set rather than just time based. (maybe both). | |
32a7627c N |
16 | */ |
17 | ||
bff61975 | 18 | #include <linux/blkdev.h> |
32a7627c | 19 | #include <linux/module.h> |
32a7627c N |
20 | #include <linux/errno.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/init.h> | |
32a7627c N |
23 | #include <linux/timer.h> |
24 | #include <linux/sched.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/file.h> | |
27 | #include <linux/mount.h> | |
28 | #include <linux/buffer_head.h> | |
43b2e5d8 | 29 | #include "md.h" |
ef740c37 | 30 | #include "bitmap.h" |
32a7627c | 31 | |
e384e585 | 32 | #include <linux/dm-dirty-log.h> |
32a7627c N |
33 | /* debug macros */ |
34 | ||
35 | #define DEBUG 0 | |
36 | ||
37 | #if DEBUG | |
38 | /* these are for debugging purposes only! */ | |
39 | ||
40 | /* define one and only one of these */ | |
41 | #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */ | |
42 | #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/ | |
43 | #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */ | |
44 | #define INJECT_FAULTS_4 0 /* undef */ | |
45 | #define INJECT_FAULTS_5 0 /* undef */ | |
46 | #define INJECT_FAULTS_6 0 | |
47 | ||
48 | /* if these are defined, the driver will fail! debug only */ | |
49 | #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */ | |
50 | #define INJECT_FATAL_FAULT_2 0 /* undef */ | |
51 | #define INJECT_FATAL_FAULT_3 0 /* undef */ | |
52 | #endif | |
53 | ||
32a7627c N |
54 | #ifndef PRINTK |
55 | # if DEBUG > 0 | |
56 | # define PRINTK(x...) printk(KERN_DEBUG x) | |
57 | # else | |
58 | # define PRINTK(x...) | |
59 | # endif | |
60 | #endif | |
61 | ||
ac2f40be | 62 | static inline char *bmname(struct bitmap *bitmap) |
32a7627c N |
63 | { |
64 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; | |
65 | } | |
66 | ||
32a7627c N |
67 | /* |
68 | * just a placeholder - calls kmalloc for bitmap pages | |
69 | */ | |
70 | static unsigned char *bitmap_alloc_page(struct bitmap *bitmap) | |
71 | { | |
72 | unsigned char *page; | |
73 | ||
44456d37 | 74 | #ifdef INJECT_FAULTS_1 |
32a7627c N |
75 | page = NULL; |
76 | #else | |
ac2f40be | 77 | page = kzalloc(PAGE_SIZE, GFP_NOIO); |
32a7627c N |
78 | #endif |
79 | if (!page) | |
80 | printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap)); | |
81 | else | |
a654b9d8 | 82 | PRINTK("%s: bitmap_alloc_page: allocated page at %p\n", |
32a7627c N |
83 | bmname(bitmap), page); |
84 | return page; | |
85 | } | |
86 | ||
87 | /* | |
88 | * for now just a placeholder -- just calls kfree for bitmap pages | |
89 | */ | |
90 | static void bitmap_free_page(struct bitmap *bitmap, unsigned char *page) | |
91 | { | |
92 | PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap), page); | |
93 | kfree(page); | |
94 | } | |
95 | ||
96 | /* | |
97 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) | |
98 | * | |
99 | * 1) check to see if this page is allocated, if it's not then try to alloc | |
100 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the | |
101 | * page pointer directly as a counter | |
102 | * | |
103 | * if we find our page, we increment the page's refcount so that it stays | |
104 | * allocated while we're using it | |
105 | */ | |
ac2f40be N |
106 | static int bitmap_checkpage(struct bitmap *bitmap, |
107 | unsigned long page, int create) | |
ee305ace N |
108 | __releases(bitmap->lock) |
109 | __acquires(bitmap->lock) | |
32a7627c N |
110 | { |
111 | unsigned char *mappage; | |
112 | ||
113 | if (page >= bitmap->pages) { | |
1187cf0a N |
114 | /* This can happen if bitmap_start_sync goes beyond |
115 | * End-of-device while looking for a whole page. | |
116 | * It is harmless. | |
117 | */ | |
32a7627c N |
118 | return -EINVAL; |
119 | } | |
120 | ||
32a7627c N |
121 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
122 | return 0; | |
123 | ||
124 | if (bitmap->bp[page].map) /* page is already allocated, just return */ | |
125 | return 0; | |
126 | ||
127 | if (!create) | |
128 | return -ENOENT; | |
129 | ||
32a7627c N |
130 | /* this page has not been allocated yet */ |
131 | ||
ac2f40be N |
132 | spin_unlock_irq(&bitmap->lock); |
133 | mappage = bitmap_alloc_page(bitmap); | |
134 | spin_lock_irq(&bitmap->lock); | |
135 | ||
136 | if (mappage == NULL) { | |
32a7627c N |
137 | PRINTK("%s: bitmap map page allocation failed, hijacking\n", |
138 | bmname(bitmap)); | |
139 | /* failed - set the hijacked flag so that we can use the | |
140 | * pointer as a counter */ | |
32a7627c N |
141 | if (!bitmap->bp[page].map) |
142 | bitmap->bp[page].hijacked = 1; | |
ac2f40be N |
143 | } else if (bitmap->bp[page].map || |
144 | bitmap->bp[page].hijacked) { | |
32a7627c N |
145 | /* somebody beat us to getting the page */ |
146 | bitmap_free_page(bitmap, mappage); | |
147 | return 0; | |
ac2f40be | 148 | } else { |
32a7627c | 149 | |
ac2f40be | 150 | /* no page was in place and we have one, so install it */ |
32a7627c | 151 | |
ac2f40be N |
152 | bitmap->bp[page].map = mappage; |
153 | bitmap->missing_pages--; | |
154 | } | |
32a7627c N |
155 | return 0; |
156 | } | |
157 | ||
32a7627c N |
158 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
159 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
160 | /* Note: lock should be held when calling this */ | |
858119e1 | 161 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
32a7627c N |
162 | { |
163 | char *ptr; | |
164 | ||
165 | if (bitmap->bp[page].count) /* page is still busy */ | |
166 | return; | |
167 | ||
168 | /* page is no longer in use, it can be released */ | |
169 | ||
170 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
171 | bitmap->bp[page].hijacked = 0; | |
172 | bitmap->bp[page].map = NULL; | |
ac2f40be N |
173 | } else { |
174 | /* normal case, free the page */ | |
175 | ptr = bitmap->bp[page].map; | |
176 | bitmap->bp[page].map = NULL; | |
177 | bitmap->missing_pages++; | |
178 | bitmap_free_page(bitmap, ptr); | |
32a7627c | 179 | } |
32a7627c N |
180 | } |
181 | ||
32a7627c N |
182 | /* |
183 | * bitmap file handling - read and write the bitmap file and its superblock | |
184 | */ | |
185 | ||
32a7627c N |
186 | /* |
187 | * basic page I/O operations | |
188 | */ | |
189 | ||
a654b9d8 | 190 | /* IO operations when bitmap is stored near all superblocks */ |
f6af949c | 191 | static struct page *read_sb_page(mddev_t *mddev, loff_t offset, |
a2ed9615 N |
192 | struct page *page, |
193 | unsigned long index, int size) | |
a654b9d8 N |
194 | { |
195 | /* choose a good rdev and read the page from there */ | |
196 | ||
197 | mdk_rdev_t *rdev; | |
a654b9d8 | 198 | sector_t target; |
ac2f40be | 199 | int did_alloc = 0; |
a654b9d8 | 200 | |
ac2f40be | 201 | if (!page) { |
a2ed9615 | 202 | page = alloc_page(GFP_KERNEL); |
ac2f40be N |
203 | if (!page) |
204 | return ERR_PTR(-ENOMEM); | |
205 | did_alloc = 1; | |
206 | } | |
a654b9d8 | 207 | |
159ec1fc | 208 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 N |
209 | if (! test_bit(In_sync, &rdev->flags) |
210 | || test_bit(Faulty, &rdev->flags)) | |
ab904d63 N |
211 | continue; |
212 | ||
ccebd4c4 | 213 | target = offset + index * (PAGE_SIZE/512); |
a654b9d8 | 214 | |
2b193363 | 215 | if (sync_page_io(rdev, target, |
e1defc4f | 216 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
ccebd4c4 | 217 | page, READ, true)) { |
ab904d63 | 218 | page->index = index; |
ce25c31b N |
219 | attach_page_buffers(page, NULL); /* so that free_buffer will |
220 | * quietly no-op */ | |
ab904d63 N |
221 | return page; |
222 | } | |
223 | } | |
ac2f40be N |
224 | if (did_alloc) |
225 | put_page(page); | |
ab904d63 | 226 | return ERR_PTR(-EIO); |
a654b9d8 | 227 | |
a654b9d8 N |
228 | } |
229 | ||
b2d2c4ce N |
230 | static mdk_rdev_t *next_active_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
231 | { | |
232 | /* Iterate the disks of an mddev, using rcu to protect access to the | |
233 | * linked list, and raising the refcount of devices we return to ensure | |
234 | * they don't disappear while in use. | |
235 | * As devices are only added or removed when raid_disk is < 0 and | |
236 | * nr_pending is 0 and In_sync is clear, the entries we return will | |
237 | * still be in the same position on the list when we re-enter | |
238 | * list_for_each_continue_rcu. | |
239 | */ | |
240 | struct list_head *pos; | |
241 | rcu_read_lock(); | |
242 | if (rdev == NULL) | |
243 | /* start at the beginning */ | |
244 | pos = &mddev->disks; | |
245 | else { | |
246 | /* release the previous rdev and start from there. */ | |
247 | rdev_dec_pending(rdev, mddev); | |
248 | pos = &rdev->same_set; | |
249 | } | |
250 | list_for_each_continue_rcu(pos, &mddev->disks) { | |
251 | rdev = list_entry(pos, mdk_rdev_t, same_set); | |
252 | if (rdev->raid_disk >= 0 && | |
b2d2c4ce N |
253 | !test_bit(Faulty, &rdev->flags)) { |
254 | /* this is a usable devices */ | |
255 | atomic_inc(&rdev->nr_pending); | |
256 | rcu_read_unlock(); | |
257 | return rdev; | |
258 | } | |
259 | } | |
260 | rcu_read_unlock(); | |
261 | return NULL; | |
262 | } | |
263 | ||
ab6085c7 | 264 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
a654b9d8 | 265 | { |
b2d2c4ce | 266 | mdk_rdev_t *rdev = NULL; |
a6ff7e08 | 267 | struct block_device *bdev; |
ab6085c7 | 268 | mddev_t *mddev = bitmap->mddev; |
a654b9d8 | 269 | |
b2d2c4ce | 270 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
ac2f40be N |
271 | int size = PAGE_SIZE; |
272 | loff_t offset = mddev->bitmap_info.offset; | |
a6ff7e08 JB |
273 | |
274 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; | |
275 | ||
ac2f40be N |
276 | if (page->index == bitmap->file_pages-1) |
277 | size = roundup(bitmap->last_page_size, | |
a6ff7e08 | 278 | bdev_logical_block_size(bdev)); |
ac2f40be N |
279 | /* Just make sure we aren't corrupting data or |
280 | * metadata | |
281 | */ | |
282 | if (mddev->external) { | |
283 | /* Bitmap could be anywhere. */ | |
284 | if (rdev->sb_start + offset + (page->index | |
285 | * (PAGE_SIZE/512)) | |
286 | > rdev->data_offset | |
287 | && | |
288 | rdev->sb_start + offset | |
289 | < (rdev->data_offset + mddev->dev_sectors | |
290 | + (PAGE_SIZE/512))) | |
291 | goto bad_alignment; | |
292 | } else if (offset < 0) { | |
293 | /* DATA BITMAP METADATA */ | |
294 | if (offset | |
295 | + (long)(page->index * (PAGE_SIZE/512)) | |
296 | + size/512 > 0) | |
297 | /* bitmap runs in to metadata */ | |
298 | goto bad_alignment; | |
299 | if (rdev->data_offset + mddev->dev_sectors | |
300 | > rdev->sb_start + offset) | |
301 | /* data runs in to bitmap */ | |
302 | goto bad_alignment; | |
303 | } else if (rdev->sb_start < rdev->data_offset) { | |
304 | /* METADATA BITMAP DATA */ | |
305 | if (rdev->sb_start | |
306 | + offset | |
307 | + page->index*(PAGE_SIZE/512) + size/512 | |
308 | > rdev->data_offset) | |
309 | /* bitmap runs in to data */ | |
310 | goto bad_alignment; | |
311 | } else { | |
312 | /* DATA METADATA BITMAP - no problems */ | |
313 | } | |
314 | md_super_write(mddev, rdev, | |
315 | rdev->sb_start + offset | |
316 | + page->index * (PAGE_SIZE/512), | |
317 | size, | |
318 | page); | |
b2d2c4ce | 319 | } |
a654b9d8 N |
320 | |
321 | if (wait) | |
a9701a30 | 322 | md_super_wait(mddev); |
a654b9d8 | 323 | return 0; |
4b80991c N |
324 | |
325 | bad_alignment: | |
4b80991c | 326 | return -EINVAL; |
a654b9d8 N |
327 | } |
328 | ||
4ad13663 | 329 | static void bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 330 | /* |
a654b9d8 | 331 | * write out a page to a file |
32a7627c | 332 | */ |
4ad13663 | 333 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 334 | { |
d785a06a | 335 | struct buffer_head *bh; |
32a7627c | 336 | |
f0d76d70 N |
337 | if (bitmap->file == NULL) { |
338 | switch (write_sb_page(bitmap, page, wait)) { | |
339 | case -EINVAL: | |
340 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
f0d76d70 | 341 | } |
4ad13663 | 342 | } else { |
a654b9d8 | 343 | |
4ad13663 | 344 | bh = page_buffers(page); |
c708443c | 345 | |
4ad13663 N |
346 | while (bh && bh->b_blocknr) { |
347 | atomic_inc(&bitmap->pending_writes); | |
348 | set_buffer_locked(bh); | |
349 | set_buffer_mapped(bh); | |
be2a2656 | 350 | submit_bh(WRITE | REQ_UNPLUG | REQ_SYNC, bh); |
4ad13663 N |
351 | bh = bh->b_this_page; |
352 | } | |
d785a06a | 353 | |
ac2f40be | 354 | if (wait) |
4ad13663 N |
355 | wait_event(bitmap->write_wait, |
356 | atomic_read(&bitmap->pending_writes)==0); | |
8a5e9cf1 | 357 | } |
4ad13663 N |
358 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
359 | bitmap_file_kick(bitmap); | |
d785a06a N |
360 | } |
361 | ||
362 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
363 | { | |
364 | struct bitmap *bitmap = bh->b_private; | |
365 | unsigned long flags; | |
32a7627c | 366 | |
d785a06a N |
367 | if (!uptodate) { |
368 | spin_lock_irqsave(&bitmap->lock, flags); | |
369 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
370 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
32a7627c | 371 | } |
d785a06a N |
372 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
373 | wake_up(&bitmap->write_wait); | |
374 | } | |
32a7627c | 375 | |
d785a06a N |
376 | /* copied from buffer.c */ |
377 | static void | |
378 | __clear_page_buffers(struct page *page) | |
379 | { | |
380 | ClearPagePrivate(page); | |
381 | set_page_private(page, 0); | |
382 | page_cache_release(page); | |
383 | } | |
384 | static void free_buffers(struct page *page) | |
385 | { | |
386 | struct buffer_head *bh = page_buffers(page); | |
77ad4bc7 | 387 | |
d785a06a N |
388 | while (bh) { |
389 | struct buffer_head *next = bh->b_this_page; | |
390 | free_buffer_head(bh); | |
391 | bh = next; | |
77ad4bc7 | 392 | } |
d785a06a N |
393 | __clear_page_buffers(page); |
394 | put_page(page); | |
32a7627c N |
395 | } |
396 | ||
d785a06a N |
397 | /* read a page from a file. |
398 | * We both read the page, and attach buffers to the page to record the | |
399 | * address of each block (using bmap). These addresses will be used | |
400 | * to write the block later, completely bypassing the filesystem. | |
401 | * This usage is similar to how swap files are handled, and allows us | |
402 | * to write to a file with no concerns of memory allocation failing. | |
403 | */ | |
32a7627c | 404 | static struct page *read_page(struct file *file, unsigned long index, |
d785a06a N |
405 | struct bitmap *bitmap, |
406 | unsigned long count) | |
32a7627c | 407 | { |
32a7627c | 408 | struct page *page = NULL; |
c649bb9c | 409 | struct inode *inode = file->f_path.dentry->d_inode; |
d785a06a N |
410 | struct buffer_head *bh; |
411 | sector_t block; | |
32a7627c | 412 | |
ac2f40be | 413 | PRINTK("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
2d1f3b5d | 414 | (unsigned long long)index << PAGE_SHIFT); |
32a7627c | 415 | |
d785a06a N |
416 | page = alloc_page(GFP_KERNEL); |
417 | if (!page) | |
418 | page = ERR_PTR(-ENOMEM); | |
32a7627c N |
419 | if (IS_ERR(page)) |
420 | goto out; | |
d785a06a | 421 | |
d785a06a N |
422 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
423 | if (!bh) { | |
2d1f3b5d | 424 | put_page(page); |
d785a06a | 425 | page = ERR_PTR(-ENOMEM); |
32a7627c N |
426 | goto out; |
427 | } | |
d785a06a N |
428 | attach_page_buffers(page, bh); |
429 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
430 | while (bh) { | |
431 | if (count == 0) | |
432 | bh->b_blocknr = 0; | |
433 | else { | |
434 | bh->b_blocknr = bmap(inode, block); | |
435 | if (bh->b_blocknr == 0) { | |
436 | /* Cannot use this file! */ | |
437 | free_buffers(page); | |
438 | page = ERR_PTR(-EINVAL); | |
439 | goto out; | |
440 | } | |
441 | bh->b_bdev = inode->i_sb->s_bdev; | |
442 | if (count < (1<<inode->i_blkbits)) | |
443 | count = 0; | |
444 | else | |
445 | count -= (1<<inode->i_blkbits); | |
446 | ||
447 | bh->b_end_io = end_bitmap_write; | |
448 | bh->b_private = bitmap; | |
ce25c31b N |
449 | atomic_inc(&bitmap->pending_writes); |
450 | set_buffer_locked(bh); | |
451 | set_buffer_mapped(bh); | |
452 | submit_bh(READ, bh); | |
d785a06a N |
453 | } |
454 | block++; | |
455 | bh = bh->b_this_page; | |
456 | } | |
d785a06a | 457 | page->index = index; |
ce25c31b N |
458 | |
459 | wait_event(bitmap->write_wait, | |
460 | atomic_read(&bitmap->pending_writes)==0); | |
461 | if (bitmap->flags & BITMAP_WRITE_ERROR) { | |
462 | free_buffers(page); | |
463 | page = ERR_PTR(-EIO); | |
464 | } | |
32a7627c N |
465 | out: |
466 | if (IS_ERR(page)) | |
ac2f40be | 467 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %ld\n", |
2d1f3b5d N |
468 | (int)PAGE_SIZE, |
469 | (unsigned long long)index << PAGE_SHIFT, | |
32a7627c N |
470 | PTR_ERR(page)); |
471 | return page; | |
472 | } | |
473 | ||
474 | /* | |
475 | * bitmap file superblock operations | |
476 | */ | |
477 | ||
478 | /* update the event counter and sync the superblock to disk */ | |
4ad13663 | 479 | void bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
480 | { |
481 | bitmap_super_t *sb; | |
482 | unsigned long flags; | |
483 | ||
484 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 485 | return; |
ece5cff0 N |
486 | if (bitmap->mddev->bitmap_info.external) |
487 | return; | |
32a7627c N |
488 | spin_lock_irqsave(&bitmap->lock, flags); |
489 | if (!bitmap->sb_page) { /* no superblock */ | |
490 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 491 | return; |
32a7627c | 492 | } |
32a7627c | 493 | spin_unlock_irqrestore(&bitmap->lock, flags); |
7b92813c | 494 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 495 | sb->events = cpu_to_le64(bitmap->mddev->events); |
a0da84f3 NB |
496 | if (bitmap->mddev->events < bitmap->events_cleared) { |
497 | /* rocking back to read-only */ | |
498 | bitmap->events_cleared = bitmap->mddev->events; | |
499 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); | |
500 | } | |
43a70507 N |
501 | /* Just in case these have been changed via sysfs: */ |
502 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
503 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
ea03aff9 | 504 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 505 | write_page(bitmap, bitmap->sb_page, 1); |
32a7627c N |
506 | } |
507 | ||
508 | /* print out the bitmap file superblock */ | |
509 | void bitmap_print_sb(struct bitmap *bitmap) | |
510 | { | |
511 | bitmap_super_t *sb; | |
512 | ||
513 | if (!bitmap || !bitmap->sb_page) | |
514 | return; | |
7b92813c | 515 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 516 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
517 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
518 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
519 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
520 | *(__u32 *)(sb->uuid+0), |
521 | *(__u32 *)(sb->uuid+4), | |
522 | *(__u32 *)(sb->uuid+8), | |
523 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 524 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 525 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 526 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 527 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
528 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
529 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
530 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
531 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
532 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 533 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
ea03aff9 | 534 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
535 | } |
536 | ||
537 | /* read the superblock from the bitmap file and initialize some bitmap fields */ | |
538 | static int bitmap_read_sb(struct bitmap *bitmap) | |
539 | { | |
540 | char *reason = NULL; | |
541 | bitmap_super_t *sb; | |
4b6d287f | 542 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c N |
543 | unsigned long long events; |
544 | int err = -EINVAL; | |
545 | ||
546 | /* page 0 is the superblock, read it... */ | |
f49d5e62 N |
547 | if (bitmap->file) { |
548 | loff_t isize = i_size_read(bitmap->file->f_mapping->host); | |
549 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; | |
550 | ||
551 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes); | |
552 | } else { | |
42a04b50 N |
553 | bitmap->sb_page = read_sb_page(bitmap->mddev, |
554 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
555 | NULL, |
556 | 0, sizeof(bitmap_super_t)); | |
a654b9d8 | 557 | } |
32a7627c N |
558 | if (IS_ERR(bitmap->sb_page)) { |
559 | err = PTR_ERR(bitmap->sb_page); | |
560 | bitmap->sb_page = NULL; | |
561 | return err; | |
562 | } | |
563 | ||
7b92813c | 564 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 565 | |
32a7627c | 566 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 567 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 568 | write_behind = le32_to_cpu(sb->write_behind); |
32a7627c N |
569 | |
570 | /* verify that the bitmap-specific fields are valid */ | |
571 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
572 | reason = "bad magic"; | |
bd926c63 N |
573 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
574 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) | |
32a7627c | 575 | reason = "unrecognized superblock version"; |
1187cf0a | 576 | else if (chunksize < 512) |
7dd5d34c | 577 | reason = "bitmap chunksize too small"; |
32a7627c N |
578 | else if ((1 << ffz(~chunksize)) != chunksize) |
579 | reason = "bitmap chunksize not a power of 2"; | |
1b04be96 | 580 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 581 | reason = "daemon sleep period out of range"; |
4b6d287f N |
582 | else if (write_behind > COUNTER_MAX) |
583 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
584 | if (reason) { |
585 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
586 | bmname(bitmap), reason); | |
587 | goto out; | |
588 | } | |
589 | ||
590 | /* keep the array size field of the bitmap superblock up to date */ | |
591 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
592 | ||
593 | if (!bitmap->mddev->persistent) | |
594 | goto success; | |
595 | ||
596 | /* | |
597 | * if we have a persistent array superblock, compare the | |
598 | * bitmap's UUID and event counter to the mddev's | |
599 | */ | |
600 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
601 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", | |
602 | bmname(bitmap)); | |
603 | goto out; | |
604 | } | |
605 | events = le64_to_cpu(sb->events); | |
606 | if (events < bitmap->mddev->events) { | |
607 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " | |
608 | "-- forcing full recovery\n", bmname(bitmap), events, | |
609 | (unsigned long long) bitmap->mddev->events); | |
4f2e639a | 610 | sb->state |= cpu_to_le32(BITMAP_STALE); |
32a7627c N |
611 | } |
612 | success: | |
613 | /* assign fields using values from superblock */ | |
42a04b50 N |
614 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
615 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
42a04b50 | 616 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
4f2e639a | 617 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 N |
618 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
619 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
32a7627c | 620 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
4f2e639a | 621 | if (sb->state & cpu_to_le32(BITMAP_STALE)) |
6a07997f | 622 | bitmap->events_cleared = bitmap->mddev->events; |
32a7627c N |
623 | err = 0; |
624 | out: | |
ea03aff9 | 625 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
626 | if (err) |
627 | bitmap_print_sb(bitmap); | |
628 | return err; | |
629 | } | |
630 | ||
631 | enum bitmap_mask_op { | |
632 | MASK_SET, | |
633 | MASK_UNSET | |
634 | }; | |
635 | ||
4ad13663 N |
636 | /* record the state of the bitmap in the superblock. Return the old value */ |
637 | static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, | |
638 | enum bitmap_mask_op op) | |
32a7627c N |
639 | { |
640 | bitmap_super_t *sb; | |
641 | unsigned long flags; | |
4ad13663 | 642 | int old; |
32a7627c N |
643 | |
644 | spin_lock_irqsave(&bitmap->lock, flags); | |
7e317655 | 645 | if (!bitmap->sb_page) { /* can't set the state */ |
32a7627c | 646 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 647 | return 0; |
32a7627c | 648 | } |
32a7627c | 649 | spin_unlock_irqrestore(&bitmap->lock, flags); |
7b92813c | 650 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
4ad13663 | 651 | old = le32_to_cpu(sb->state) & bits; |
32a7627c | 652 | switch (op) { |
ac2f40be N |
653 | case MASK_SET: |
654 | sb->state |= cpu_to_le32(bits); | |
655 | break; | |
656 | case MASK_UNSET: | |
657 | sb->state &= cpu_to_le32(~bits); | |
658 | break; | |
659 | default: | |
660 | BUG(); | |
32a7627c | 661 | } |
ea03aff9 | 662 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 663 | return old; |
32a7627c N |
664 | } |
665 | ||
666 | /* | |
667 | * general bitmap file operations | |
668 | */ | |
669 | ||
ece5cff0 N |
670 | /* |
671 | * on-disk bitmap: | |
672 | * | |
673 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
674 | * file a page at a time. There's a superblock at the start of the file. | |
675 | */ | |
32a7627c | 676 | /* calculate the index of the page that contains this bit */ |
ece5cff0 | 677 | static inline unsigned long file_page_index(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 678 | { |
ece5cff0 N |
679 | if (!bitmap->mddev->bitmap_info.external) |
680 | chunk += sizeof(bitmap_super_t) << 3; | |
681 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
682 | } |
683 | ||
684 | /* calculate the (bit) offset of this bit within a page */ | |
ece5cff0 | 685 | static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 686 | { |
ece5cff0 N |
687 | if (!bitmap->mddev->bitmap_info.external) |
688 | chunk += sizeof(bitmap_super_t) << 3; | |
689 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
690 | } |
691 | ||
692 | /* | |
693 | * return a pointer to the page in the filemap that contains the given bit | |
694 | * | |
695 | * this lookup is complicated by the fact that the bitmap sb might be exactly | |
696 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page | |
697 | * 0 or page 1 | |
698 | */ | |
699 | static inline struct page *filemap_get_page(struct bitmap *bitmap, | |
700 | unsigned long chunk) | |
701 | { | |
e384e585 N |
702 | if (bitmap->filemap == NULL) |
703 | return NULL; | |
ac2f40be N |
704 | if (file_page_index(bitmap, chunk) >= bitmap->file_pages) |
705 | return NULL; | |
ece5cff0 N |
706 | return bitmap->filemap[file_page_index(bitmap, chunk) |
707 | - file_page_index(bitmap, 0)]; | |
32a7627c N |
708 | } |
709 | ||
32a7627c N |
710 | static void bitmap_file_unmap(struct bitmap *bitmap) |
711 | { | |
712 | struct page **map, *sb_page; | |
713 | unsigned long *attr; | |
714 | int pages; | |
715 | unsigned long flags; | |
716 | ||
717 | spin_lock_irqsave(&bitmap->lock, flags); | |
718 | map = bitmap->filemap; | |
719 | bitmap->filemap = NULL; | |
720 | attr = bitmap->filemap_attr; | |
721 | bitmap->filemap_attr = NULL; | |
722 | pages = bitmap->file_pages; | |
723 | bitmap->file_pages = 0; | |
724 | sb_page = bitmap->sb_page; | |
725 | bitmap->sb_page = NULL; | |
726 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
727 | ||
728 | while (pages--) | |
ece5cff0 | 729 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 730 | free_buffers(map[pages]); |
32a7627c N |
731 | kfree(map); |
732 | kfree(attr); | |
733 | ||
d785a06a N |
734 | if (sb_page) |
735 | free_buffers(sb_page); | |
32a7627c N |
736 | } |
737 | ||
738 | static void bitmap_file_put(struct bitmap *bitmap) | |
739 | { | |
740 | struct file *file; | |
32a7627c N |
741 | unsigned long flags; |
742 | ||
743 | spin_lock_irqsave(&bitmap->lock, flags); | |
744 | file = bitmap->file; | |
745 | bitmap->file = NULL; | |
746 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
747 | ||
d785a06a N |
748 | if (file) |
749 | wait_event(bitmap->write_wait, | |
750 | atomic_read(&bitmap->pending_writes)==0); | |
32a7627c N |
751 | bitmap_file_unmap(bitmap); |
752 | ||
d785a06a | 753 | if (file) { |
c649bb9c | 754 | struct inode *inode = file->f_path.dentry->d_inode; |
fc0ecff6 | 755 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 756 | fput(file); |
d785a06a | 757 | } |
32a7627c N |
758 | } |
759 | ||
32a7627c N |
760 | /* |
761 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
762 | * then it is no longer reliable, so we stop using it and we mark the file | |
763 | * as failed in the superblock | |
764 | */ | |
765 | static void bitmap_file_kick(struct bitmap *bitmap) | |
766 | { | |
767 | char *path, *ptr = NULL; | |
768 | ||
4ad13663 N |
769 | if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) { |
770 | bitmap_update_sb(bitmap); | |
32a7627c | 771 | |
4ad13663 N |
772 | if (bitmap->file) { |
773 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
774 | if (path) | |
6bcfd601 CH |
775 | ptr = d_path(&bitmap->file->f_path, path, |
776 | PAGE_SIZE); | |
777 | ||
4ad13663 N |
778 | printk(KERN_ALERT |
779 | "%s: kicking failed bitmap file %s from array!\n", | |
6bcfd601 | 780 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
32a7627c | 781 | |
4ad13663 N |
782 | kfree(path); |
783 | } else | |
784 | printk(KERN_ALERT | |
785 | "%s: disabling internal bitmap due to errors\n", | |
786 | bmname(bitmap)); | |
a654b9d8 | 787 | } |
32a7627c N |
788 | |
789 | bitmap_file_put(bitmap); | |
790 | ||
791 | return; | |
792 | } | |
793 | ||
794 | enum bitmap_page_attr { | |
ac2f40be N |
795 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
796 | BITMAP_PAGE_CLEAN = 1, /* there are bits that might need to be cleared */ | |
797 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ | |
32a7627c N |
798 | }; |
799 | ||
800 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, | |
801 | enum bitmap_page_attr attr) | |
802 | { | |
e384e585 N |
803 | if (page) |
804 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); | |
805 | else | |
806 | __set_bit(attr, &bitmap->logattrs); | |
32a7627c N |
807 | } |
808 | ||
809 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, | |
810 | enum bitmap_page_attr attr) | |
811 | { | |
e384e585 N |
812 | if (page) |
813 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); | |
814 | else | |
815 | __clear_bit(attr, &bitmap->logattrs); | |
32a7627c N |
816 | } |
817 | ||
ec7a3197 N |
818 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
819 | enum bitmap_page_attr attr) | |
32a7627c | 820 | { |
e384e585 N |
821 | if (page) |
822 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); | |
823 | else | |
824 | return test_bit(attr, &bitmap->logattrs); | |
32a7627c N |
825 | } |
826 | ||
827 | /* | |
828 | * bitmap_file_set_bit -- called before performing a write to the md device | |
829 | * to set (and eventually sync) a particular bit in the bitmap file | |
830 | * | |
831 | * we set the bit immediately, then we record the page number so that | |
832 | * when an unplug occurs, we can flush the dirty pages out to disk | |
833 | */ | |
834 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
835 | { | |
836 | unsigned long bit; | |
e384e585 | 837 | struct page *page = NULL; |
32a7627c N |
838 | void *kaddr; |
839 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); | |
840 | ||
e384e585 N |
841 | if (!bitmap->filemap) { |
842 | struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log; | |
843 | if (log) | |
844 | log->type->mark_region(log, chunk); | |
845 | } else { | |
32a7627c | 846 | |
e384e585 N |
847 | page = filemap_get_page(bitmap, chunk); |
848 | if (!page) | |
849 | return; | |
850 | bit = file_page_offset(bitmap, chunk); | |
32a7627c | 851 | |
e384e585 N |
852 | /* set the bit */ |
853 | kaddr = kmap_atomic(page, KM_USER0); | |
854 | if (bitmap->flags & BITMAP_HOSTENDIAN) | |
855 | set_bit(bit, kaddr); | |
856 | else | |
857 | ext2_set_bit(bit, kaddr); | |
858 | kunmap_atomic(kaddr, KM_USER0); | |
859 | PRINTK("set file bit %lu page %lu\n", bit, page->index); | |
860 | } | |
32a7627c N |
861 | /* record page number so it gets flushed to disk when unplug occurs */ |
862 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); | |
32a7627c N |
863 | } |
864 | ||
865 | /* this gets called when the md device is ready to unplug its underlying | |
866 | * (slave) device queues -- before we let any writes go down, we need to | |
867 | * sync the dirty pages of the bitmap file to disk */ | |
4ad13663 | 868 | void bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 869 | { |
ec7a3197 N |
870 | unsigned long i, flags; |
871 | int dirty, need_write; | |
32a7627c N |
872 | struct page *page; |
873 | int wait = 0; | |
874 | ||
875 | if (!bitmap) | |
4ad13663 | 876 | return; |
e384e585 N |
877 | if (!bitmap->filemap) { |
878 | /* Must be using a dirty_log */ | |
879 | struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log; | |
880 | dirty = test_and_clear_bit(BITMAP_PAGE_DIRTY, &bitmap->logattrs); | |
881 | need_write = test_and_clear_bit(BITMAP_PAGE_NEEDWRITE, &bitmap->logattrs); | |
882 | if (dirty || need_write) | |
883 | if (log->type->flush(log)) | |
884 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
885 | goto out; | |
886 | } | |
32a7627c N |
887 | |
888 | /* look at each page to see if there are any set bits that need to be | |
889 | * flushed out to disk */ | |
890 | for (i = 0; i < bitmap->file_pages; i++) { | |
891 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 892 | if (!bitmap->filemap) { |
32a7627c | 893 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 894 | return; |
32a7627c N |
895 | } |
896 | page = bitmap->filemap[i]; | |
ec7a3197 N |
897 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
898 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
32a7627c N |
899 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
900 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
ec7a3197 | 901 | if (dirty) |
32a7627c N |
902 | wait = 1; |
903 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
904 | ||
ac2f40be | 905 | if (dirty || need_write) |
4ad13663 | 906 | write_page(bitmap, page, 0); |
32a7627c N |
907 | } |
908 | if (wait) { /* if any writes were performed, we need to wait on them */ | |
0b79ccf0 | 909 | if (bitmap->file) |
d785a06a N |
910 | wait_event(bitmap->write_wait, |
911 | atomic_read(&bitmap->pending_writes)==0); | |
0b79ccf0 | 912 | else |
a9701a30 | 913 | md_super_wait(bitmap->mddev); |
32a7627c | 914 | } |
e384e585 | 915 | out: |
d785a06a N |
916 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
917 | bitmap_file_kick(bitmap); | |
32a7627c | 918 | } |
ac2f40be | 919 | EXPORT_SYMBOL(bitmap_unplug); |
32a7627c | 920 | |
6a07997f | 921 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
922 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
923 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
924 | * memory mapping of the bitmap file | |
925 | * Special cases: | |
926 | * if there's no bitmap file, or if the bitmap file had been | |
927 | * previously kicked from the array, we mark all the bits as | |
928 | * 1's in order to cause a full resync. | |
6a07997f N |
929 | * |
930 | * We ignore all bits for sectors that end earlier than 'start'. | |
931 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 932 | */ |
6a07997f | 933 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c N |
934 | { |
935 | unsigned long i, chunks, index, oldindex, bit; | |
936 | struct page *page = NULL, *oldpage = NULL; | |
937 | unsigned long num_pages, bit_cnt = 0; | |
938 | struct file *file; | |
d785a06a | 939 | unsigned long bytes, offset; |
32a7627c N |
940 | int outofdate; |
941 | int ret = -ENOSPC; | |
ea03aff9 | 942 | void *paddr; |
32a7627c N |
943 | |
944 | chunks = bitmap->chunks; | |
945 | file = bitmap->file; | |
946 | ||
42a04b50 | 947 | BUG_ON(!file && !bitmap->mddev->bitmap_info.offset); |
32a7627c | 948 | |
44456d37 | 949 | #ifdef INJECT_FAULTS_3 |
32a7627c N |
950 | outofdate = 1; |
951 | #else | |
952 | outofdate = bitmap->flags & BITMAP_STALE; | |
953 | #endif | |
954 | if (outofdate) | |
955 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
956 | "recovery\n", bmname(bitmap)); | |
957 | ||
e384e585 | 958 | bytes = DIV_ROUND_UP(bitmap->chunks, 8); |
ece5cff0 N |
959 | if (!bitmap->mddev->bitmap_info.external) |
960 | bytes += sizeof(bitmap_super_t); | |
bc7f77de | 961 | |
e384e585 | 962 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); |
bc7f77de | 963 | |
ece5cff0 | 964 | if (file && i_size_read(file->f_mapping->host) < bytes) { |
32a7627c N |
965 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
966 | bmname(bitmap), | |
967 | (unsigned long) i_size_read(file->f_mapping->host), | |
ece5cff0 | 968 | bytes); |
4ad13663 | 969 | goto err; |
32a7627c | 970 | } |
bc7f77de N |
971 | |
972 | ret = -ENOMEM; | |
973 | ||
32a7627c | 974 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
bc7f77de | 975 | if (!bitmap->filemap) |
4ad13663 | 976 | goto err; |
32a7627c | 977 | |
e16b68b6 N |
978 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
979 | bitmap->filemap_attr = kzalloc( | |
ac2f40be | 980 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
e16b68b6 | 981 | GFP_KERNEL); |
bc7f77de | 982 | if (!bitmap->filemap_attr) |
4ad13663 | 983 | goto err; |
32a7627c | 984 | |
32a7627c N |
985 | oldindex = ~0L; |
986 | ||
987 | for (i = 0; i < chunks; i++) { | |
bd926c63 | 988 | int b; |
ece5cff0 N |
989 | index = file_page_index(bitmap, i); |
990 | bit = file_page_offset(bitmap, i); | |
32a7627c | 991 | if (index != oldindex) { /* this is a new page, read it in */ |
d785a06a | 992 | int count; |
32a7627c | 993 | /* unmap the old page, we're done with it */ |
d785a06a | 994 | if (index == num_pages-1) |
ece5cff0 | 995 | count = bytes - index * PAGE_SIZE; |
d785a06a N |
996 | else |
997 | count = PAGE_SIZE; | |
ece5cff0 | 998 | if (index == 0 && bitmap->sb_page) { |
32a7627c N |
999 | /* |
1000 | * if we're here then the superblock page | |
1001 | * contains some bits (PAGE_SIZE != sizeof sb) | |
1002 | * we've already read it in, so just use it | |
1003 | */ | |
1004 | page = bitmap->sb_page; | |
1005 | offset = sizeof(bitmap_super_t); | |
53845270 | 1006 | if (!file) |
5c04f551 VK |
1007 | page = read_sb_page( |
1008 | bitmap->mddev, | |
1009 | bitmap->mddev->bitmap_info.offset, | |
1010 | page, | |
1011 | index, count); | |
a654b9d8 | 1012 | } else if (file) { |
d785a06a | 1013 | page = read_page(file, index, bitmap, count); |
a654b9d8 N |
1014 | offset = 0; |
1015 | } else { | |
42a04b50 N |
1016 | page = read_sb_page(bitmap->mddev, |
1017 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
1018 | NULL, |
1019 | index, count); | |
32a7627c N |
1020 | offset = 0; |
1021 | } | |
a654b9d8 N |
1022 | if (IS_ERR(page)) { /* read error */ |
1023 | ret = PTR_ERR(page); | |
4ad13663 | 1024 | goto err; |
a654b9d8 N |
1025 | } |
1026 | ||
32a7627c N |
1027 | oldindex = index; |
1028 | oldpage = page; | |
32a7627c | 1029 | |
b74fd282 N |
1030 | bitmap->filemap[bitmap->file_pages++] = page; |
1031 | bitmap->last_page_size = count; | |
1032 | ||
32a7627c N |
1033 | if (outofdate) { |
1034 | /* | |
1035 | * if bitmap is out of date, dirty the | |
ac2f40be | 1036 | * whole page and write it out |
32a7627c | 1037 | */ |
ea03aff9 N |
1038 | paddr = kmap_atomic(page, KM_USER0); |
1039 | memset(paddr + offset, 0xff, | |
6a07997f | 1040 | PAGE_SIZE - offset); |
ea03aff9 | 1041 | kunmap_atomic(paddr, KM_USER0); |
4ad13663 N |
1042 | write_page(bitmap, page, 1); |
1043 | ||
1044 | ret = -EIO; | |
b74fd282 | 1045 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
4ad13663 | 1046 | goto err; |
32a7627c | 1047 | } |
32a7627c | 1048 | } |
ea03aff9 | 1049 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1050 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 1051 | b = test_bit(bit, paddr); |
bd926c63 | 1052 | else |
ea03aff9 N |
1053 | b = ext2_test_bit(bit, paddr); |
1054 | kunmap_atomic(paddr, KM_USER0); | |
bd926c63 | 1055 | if (b) { |
32a7627c | 1056 | /* if the disk bit is set, set the memory bit */ |
db305e50 N |
1057 | int needed = ((sector_t)(i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) |
1058 | >= start); | |
1059 | bitmap_set_memory_bits(bitmap, | |
1060 | (sector_t)i << CHUNK_BLOCK_SHIFT(bitmap), | |
1061 | needed); | |
32a7627c | 1062 | bit_cnt++; |
6a07997f | 1063 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
32a7627c | 1064 | } |
32a7627c N |
1065 | } |
1066 | ||
ac2f40be | 1067 | /* everything went OK */ |
32a7627c N |
1068 | ret = 0; |
1069 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); | |
1070 | ||
32a7627c N |
1071 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
1072 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
1073 | md_wakeup_thread(bitmap->mddev->thread); | |
1074 | } | |
1075 | ||
32a7627c | 1076 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
4ad13663 N |
1077 | "read %lu/%lu pages, set %lu bits\n", |
1078 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt); | |
1079 | ||
1080 | return 0; | |
32a7627c | 1081 | |
4ad13663 N |
1082 | err: |
1083 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", | |
1084 | bmname(bitmap), ret); | |
32a7627c N |
1085 | return ret; |
1086 | } | |
1087 | ||
a654b9d8 N |
1088 | void bitmap_write_all(struct bitmap *bitmap) |
1089 | { | |
1090 | /* We don't actually write all bitmap blocks here, | |
1091 | * just flag them as needing to be written | |
1092 | */ | |
ec7a3197 | 1093 | int i; |
a654b9d8 | 1094 | |
ac2f40be | 1095 | for (i = 0; i < bitmap->file_pages; i++) |
ec7a3197 N |
1096 | set_page_attr(bitmap, bitmap->filemap[i], |
1097 | BITMAP_PAGE_NEEDWRITE); | |
a654b9d8 N |
1098 | } |
1099 | ||
32a7627c N |
1100 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
1101 | { | |
1102 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1103 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1104 | bitmap->bp[page].count += inc; | |
32a7627c N |
1105 | bitmap_checkfree(bitmap, page); |
1106 | } | |
1107 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, | |
57dab0bd | 1108 | sector_t offset, sector_t *blocks, |
32a7627c N |
1109 | int create); |
1110 | ||
1111 | /* | |
1112 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1113 | * out to disk | |
1114 | */ | |
1115 | ||
aa5cbd10 | 1116 | void bitmap_daemon_work(mddev_t *mddev) |
32a7627c | 1117 | { |
aa5cbd10 | 1118 | struct bitmap *bitmap; |
aa3163f8 | 1119 | unsigned long j; |
32a7627c N |
1120 | unsigned long flags; |
1121 | struct page *page = NULL, *lastpage = NULL; | |
57dab0bd | 1122 | sector_t blocks; |
ea03aff9 | 1123 | void *paddr; |
e384e585 | 1124 | struct dm_dirty_log *log = mddev->bitmap_info.log; |
32a7627c | 1125 | |
aa5cbd10 N |
1126 | /* Use a mutex to guard daemon_work against |
1127 | * bitmap_destroy. | |
1128 | */ | |
c3d9714e | 1129 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1130 | bitmap = mddev->bitmap; |
1131 | if (bitmap == NULL) { | |
c3d9714e | 1132 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1133 | return; |
aa5cbd10 | 1134 | } |
42a04b50 | 1135 | if (time_before(jiffies, bitmap->daemon_lastrun |
1b04be96 | 1136 | + bitmap->mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1137 | goto done; |
1138 | ||
32a7627c | 1139 | bitmap->daemon_lastrun = jiffies; |
8311c29d N |
1140 | if (bitmap->allclean) { |
1141 | bitmap->mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
aa5cbd10 | 1142 | goto done; |
8311c29d N |
1143 | } |
1144 | bitmap->allclean = 1; | |
32a7627c | 1145 | |
be512691 | 1146 | spin_lock_irqsave(&bitmap->lock, flags); |
32a7627c N |
1147 | for (j = 0; j < bitmap->chunks; j++) { |
1148 | bitmap_counter_t *bmc; | |
e384e585 N |
1149 | if (!bitmap->filemap) { |
1150 | if (!log) | |
1151 | /* error or shutdown */ | |
1152 | break; | |
1153 | } else | |
1154 | page = filemap_get_page(bitmap, j); | |
32a7627c N |
1155 | |
1156 | if (page != lastpage) { | |
aa3163f8 | 1157 | /* skip this page unless it's marked as needing cleaning */ |
ec7a3197 N |
1158 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) { |
1159 | int need_write = test_page_attr(bitmap, page, | |
1160 | BITMAP_PAGE_NEEDWRITE); | |
a647e4bc | 1161 | if (need_write) |
aa3163f8 | 1162 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
a647e4bc | 1163 | |
aa3163f8 | 1164 | spin_unlock_irqrestore(&bitmap->lock, flags); |
8311c29d | 1165 | if (need_write) { |
4ad13663 | 1166 | write_page(bitmap, page, 0); |
8311c29d N |
1167 | bitmap->allclean = 0; |
1168 | } | |
be512691 N |
1169 | spin_lock_irqsave(&bitmap->lock, flags); |
1170 | j |= (PAGE_BITS - 1); | |
aa3163f8 N |
1171 | continue; |
1172 | } | |
1173 | ||
32a7627c | 1174 | /* grab the new page, sync and release the old */ |
32a7627c | 1175 | if (lastpage != NULL) { |
ec7a3197 | 1176 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1177 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1178 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 1179 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1180 | } else { |
1181 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1182 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1183 | } | |
32a7627c N |
1184 | } else |
1185 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1186 | lastpage = page; | |
a0da84f3 NB |
1187 | |
1188 | /* We are possibly going to clear some bits, so make | |
1189 | * sure that events_cleared is up-to-date. | |
1190 | */ | |
ece5cff0 N |
1191 | if (bitmap->need_sync && |
1192 | bitmap->mddev->bitmap_info.external == 0) { | |
a0da84f3 NB |
1193 | bitmap_super_t *sb; |
1194 | bitmap->need_sync = 0; | |
1195 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); | |
1196 | sb->events_cleared = | |
1197 | cpu_to_le64(bitmap->events_cleared); | |
1198 | kunmap_atomic(sb, KM_USER0); | |
1199 | write_page(bitmap, bitmap->sb_page, 1); | |
1200 | } | |
32a7627c | 1201 | spin_lock_irqsave(&bitmap->lock, flags); |
ece5cff0 N |
1202 | if (!bitmap->need_sync) |
1203 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
32a7627c | 1204 | } |
db305e50 N |
1205 | bmc = bitmap_get_counter(bitmap, |
1206 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
1207 | &blocks, 0); | |
32a7627c | 1208 | if (bmc) { |
8311c29d N |
1209 | if (*bmc) |
1210 | bitmap->allclean = 0; | |
1211 | ||
32a7627c | 1212 | if (*bmc == 2) { |
ac2f40be | 1213 | *bmc = 1; /* maybe clear the bit next time */ |
32a7627c | 1214 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
ece5cff0 | 1215 | } else if (*bmc == 1 && !bitmap->need_sync) { |
32a7627c N |
1216 | /* we can clear the bit */ |
1217 | *bmc = 0; | |
db305e50 N |
1218 | bitmap_count_page(bitmap, |
1219 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
32a7627c N |
1220 | -1); |
1221 | ||
1222 | /* clear the bit */ | |
e384e585 N |
1223 | if (page) { |
1224 | paddr = kmap_atomic(page, KM_USER0); | |
1225 | if (bitmap->flags & BITMAP_HOSTENDIAN) | |
1226 | clear_bit(file_page_offset(bitmap, j), | |
1227 | paddr); | |
1228 | else | |
1229 | ext2_clear_bit(file_page_offset(bitmap, j), | |
1230 | paddr); | |
1231 | kunmap_atomic(paddr, KM_USER0); | |
1232 | } else | |
1233 | log->type->clear_region(log, j); | |
32a7627c | 1234 | } |
be512691 N |
1235 | } else |
1236 | j |= PAGE_COUNTER_MASK; | |
32a7627c | 1237 | } |
be512691 | 1238 | spin_unlock_irqrestore(&bitmap->lock, flags); |
32a7627c N |
1239 | |
1240 | /* now sync the final page */ | |
e384e585 | 1241 | if (lastpage != NULL || log != NULL) { |
32a7627c | 1242 | spin_lock_irqsave(&bitmap->lock, flags); |
ec7a3197 | 1243 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1244 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1245 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
e384e585 N |
1246 | if (lastpage) |
1247 | write_page(bitmap, lastpage, 0); | |
1248 | else | |
1249 | if (log->type->flush(log)) | |
1250 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
32a7627c N |
1251 | } else { |
1252 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1253 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1254 | } | |
32a7627c N |
1255 | } |
1256 | ||
7be3dfec | 1257 | done: |
8311c29d | 1258 | if (bitmap->allclean == 0) |
ac2f40be | 1259 | bitmap->mddev->thread->timeout = |
1b04be96 | 1260 | bitmap->mddev->bitmap_info.daemon_sleep; |
c3d9714e | 1261 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1262 | } |
1263 | ||
32a7627c | 1264 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
57dab0bd | 1265 | sector_t offset, sector_t *blocks, |
32a7627c | 1266 | int create) |
ee305ace N |
1267 | __releases(bitmap->lock) |
1268 | __acquires(bitmap->lock) | |
32a7627c N |
1269 | { |
1270 | /* If 'create', we might release the lock and reclaim it. | |
1271 | * The lock must have been taken with interrupts enabled. | |
1272 | * If !create, we don't release the lock. | |
1273 | */ | |
1274 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1275 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1276 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1277 | sector_t csize; | |
ef425673 | 1278 | int err; |
32a7627c | 1279 | |
ef425673 N |
1280 | err = bitmap_checkpage(bitmap, page, create); |
1281 | ||
1282 | if (bitmap->bp[page].hijacked || | |
1283 | bitmap->bp[page].map == NULL) | |
1284 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + | |
1285 | PAGE_COUNTER_SHIFT - 1); | |
1286 | else | |
32a7627c | 1287 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); |
ef425673 N |
1288 | *blocks = csize - (offset & (csize - 1)); |
1289 | ||
1290 | if (err < 0) | |
32a7627c | 1291 | return NULL; |
ef425673 | 1292 | |
32a7627c N |
1293 | /* now locked ... */ |
1294 | ||
1295 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1296 | /* should we use the first or second counter field | |
1297 | * of the hijacked pointer? */ | |
1298 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
32a7627c N |
1299 | return &((bitmap_counter_t *) |
1300 | &bitmap->bp[page].map)[hi]; | |
ef425673 | 1301 | } else /* page is allocated */ |
32a7627c N |
1302 | return (bitmap_counter_t *) |
1303 | &(bitmap->bp[page].map[pageoff]); | |
32a7627c N |
1304 | } |
1305 | ||
4b6d287f | 1306 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1307 | { |
ac2f40be N |
1308 | if (!bitmap) |
1309 | return 0; | |
4b6d287f N |
1310 | |
1311 | if (behind) { | |
696fcd53 | 1312 | int bw; |
4b6d287f | 1313 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1314 | bw = atomic_read(&bitmap->behind_writes); |
1315 | if (bw > bitmap->behind_writes_used) | |
1316 | bitmap->behind_writes_used = bw; | |
1317 | ||
4b6d287f | 1318 | PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", |
696fcd53 | 1319 | bw, bitmap->max_write_behind); |
4b6d287f N |
1320 | } |
1321 | ||
32a7627c | 1322 | while (sectors) { |
57dab0bd | 1323 | sector_t blocks; |
32a7627c N |
1324 | bitmap_counter_t *bmc; |
1325 | ||
1326 | spin_lock_irq(&bitmap->lock); | |
1327 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); | |
1328 | if (!bmc) { | |
1329 | spin_unlock_irq(&bitmap->lock); | |
1330 | return 0; | |
1331 | } | |
1332 | ||
da6e1a32 NB |
1333 | if (unlikely((*bmc & COUNTER_MAX) == COUNTER_MAX)) { |
1334 | DEFINE_WAIT(__wait); | |
1335 | /* note that it is safe to do the prepare_to_wait | |
1336 | * after the test as long as we do it before dropping | |
1337 | * the spinlock. | |
1338 | */ | |
1339 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1340 | TASK_UNINTERRUPTIBLE); | |
1341 | spin_unlock_irq(&bitmap->lock); | |
b63d7c2e | 1342 | md_unplug(bitmap->mddev); |
da6e1a32 NB |
1343 | schedule(); |
1344 | finish_wait(&bitmap->overflow_wait, &__wait); | |
1345 | continue; | |
1346 | } | |
1347 | ||
ac2f40be | 1348 | switch (*bmc) { |
32a7627c N |
1349 | case 0: |
1350 | bitmap_file_set_bit(bitmap, offset); | |
ac2f40be | 1351 | bitmap_count_page(bitmap, offset, 1); |
32a7627c N |
1352 | /* fall through */ |
1353 | case 1: | |
1354 | *bmc = 2; | |
1355 | } | |
da6e1a32 | 1356 | |
32a7627c N |
1357 | (*bmc)++; |
1358 | ||
1359 | spin_unlock_irq(&bitmap->lock); | |
1360 | ||
1361 | offset += blocks; | |
1362 | if (sectors > blocks) | |
1363 | sectors -= blocks; | |
ac2f40be N |
1364 | else |
1365 | sectors = 0; | |
32a7627c | 1366 | } |
8311c29d | 1367 | bitmap->allclean = 0; |
32a7627c N |
1368 | return 0; |
1369 | } | |
ac2f40be | 1370 | EXPORT_SYMBOL(bitmap_startwrite); |
32a7627c N |
1371 | |
1372 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1373 | int success, int behind) |
32a7627c | 1374 | { |
ac2f40be N |
1375 | if (!bitmap) |
1376 | return; | |
4b6d287f | 1377 | if (behind) { |
e555190d N |
1378 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1379 | wake_up(&bitmap->behind_wait); | |
4b6d287f N |
1380 | PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", |
1381 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1382 | } | |
d0a4bb49 N |
1383 | if (bitmap->mddev->degraded) |
1384 | /* Never clear bits or update events_cleared when degraded */ | |
1385 | success = 0; | |
4b6d287f | 1386 | |
32a7627c | 1387 | while (sectors) { |
57dab0bd | 1388 | sector_t blocks; |
32a7627c N |
1389 | unsigned long flags; |
1390 | bitmap_counter_t *bmc; | |
1391 | ||
1392 | spin_lock_irqsave(&bitmap->lock, flags); | |
1393 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); | |
1394 | if (!bmc) { | |
1395 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1396 | return; | |
1397 | } | |
1398 | ||
a0da84f3 NB |
1399 | if (success && |
1400 | bitmap->events_cleared < bitmap->mddev->events) { | |
1401 | bitmap->events_cleared = bitmap->mddev->events; | |
1402 | bitmap->need_sync = 1; | |
5ff5afff | 1403 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1404 | } |
1405 | ||
32a7627c N |
1406 | if (!success && ! (*bmc & NEEDED_MASK)) |
1407 | *bmc |= NEEDED_MASK; | |
1408 | ||
da6e1a32 NB |
1409 | if ((*bmc & COUNTER_MAX) == COUNTER_MAX) |
1410 | wake_up(&bitmap->overflow_wait); | |
1411 | ||
32a7627c | 1412 | (*bmc)--; |
ac2f40be | 1413 | if (*bmc <= 2) |
32a7627c | 1414 | set_page_attr(bitmap, |
e384e585 N |
1415 | filemap_get_page( |
1416 | bitmap, | |
1417 | offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
32a7627c | 1418 | BITMAP_PAGE_CLEAN); |
ac2f40be | 1419 | |
32a7627c N |
1420 | spin_unlock_irqrestore(&bitmap->lock, flags); |
1421 | offset += blocks; | |
1422 | if (sectors > blocks) | |
1423 | sectors -= blocks; | |
ac2f40be N |
1424 | else |
1425 | sectors = 0; | |
32a7627c N |
1426 | } |
1427 | } | |
ac2f40be | 1428 | EXPORT_SYMBOL(bitmap_endwrite); |
32a7627c | 1429 | |
57dab0bd | 1430 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a | 1431 | int degraded) |
32a7627c N |
1432 | { |
1433 | bitmap_counter_t *bmc; | |
1434 | int rv; | |
1435 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1436 | *blocks = 1024; | |
1437 | return 1; /* always resync if no bitmap */ | |
1438 | } | |
1439 | spin_lock_irq(&bitmap->lock); | |
1440 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1441 | rv = 0; | |
1442 | if (bmc) { | |
1443 | /* locked */ | |
1444 | if (RESYNC(*bmc)) | |
1445 | rv = 1; | |
1446 | else if (NEEDED(*bmc)) { | |
1447 | rv = 1; | |
6a806c51 N |
1448 | if (!degraded) { /* don't set/clear bits if degraded */ |
1449 | *bmc |= RESYNC_MASK; | |
1450 | *bmc &= ~NEEDED_MASK; | |
1451 | } | |
32a7627c N |
1452 | } |
1453 | } | |
1454 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1455 | bitmap->allclean = 0; |
32a7627c N |
1456 | return rv; |
1457 | } | |
1458 | ||
57dab0bd | 1459 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a N |
1460 | int degraded) |
1461 | { | |
1462 | /* bitmap_start_sync must always report on multiples of whole | |
1463 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1464 | * get confused. | |
1465 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1466 | * At least PAGE_SIZE>>9 blocks are covered. | |
1467 | * Return the 'or' of the result. | |
1468 | */ | |
1469 | int rv = 0; | |
57dab0bd | 1470 | sector_t blocks1; |
1187cf0a N |
1471 | |
1472 | *blocks = 0; | |
1473 | while (*blocks < (PAGE_SIZE>>9)) { | |
1474 | rv |= __bitmap_start_sync(bitmap, offset, | |
1475 | &blocks1, degraded); | |
1476 | offset += blocks1; | |
1477 | *blocks += blocks1; | |
1478 | } | |
1479 | return rv; | |
1480 | } | |
ac2f40be | 1481 | EXPORT_SYMBOL(bitmap_start_sync); |
1187cf0a | 1482 | |
57dab0bd | 1483 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
32a7627c N |
1484 | { |
1485 | bitmap_counter_t *bmc; | |
1486 | unsigned long flags; | |
ac2f40be N |
1487 | |
1488 | if (bitmap == NULL) { | |
32a7627c N |
1489 | *blocks = 1024; |
1490 | return; | |
1491 | } | |
1492 | spin_lock_irqsave(&bitmap->lock, flags); | |
1493 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1494 | if (bmc == NULL) | |
1495 | goto unlock; | |
1496 | /* locked */ | |
32a7627c N |
1497 | if (RESYNC(*bmc)) { |
1498 | *bmc &= ~RESYNC_MASK; | |
1499 | ||
1500 | if (!NEEDED(*bmc) && aborted) | |
1501 | *bmc |= NEEDED_MASK; | |
1502 | else { | |
ac2f40be | 1503 | if (*bmc <= 2) |
32a7627c N |
1504 | set_page_attr(bitmap, |
1505 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1506 | BITMAP_PAGE_CLEAN); | |
32a7627c N |
1507 | } |
1508 | } | |
1509 | unlock: | |
1510 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
8311c29d | 1511 | bitmap->allclean = 0; |
32a7627c | 1512 | } |
ac2f40be | 1513 | EXPORT_SYMBOL(bitmap_end_sync); |
32a7627c N |
1514 | |
1515 | void bitmap_close_sync(struct bitmap *bitmap) | |
1516 | { | |
1517 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1518 | * properly have been aborted. It remains to us to clear the | |
1519 | * RESYNC bit wherever it is still on | |
1520 | */ | |
1521 | sector_t sector = 0; | |
57dab0bd | 1522 | sector_t blocks; |
b47490c9 N |
1523 | if (!bitmap) |
1524 | return; | |
32a7627c N |
1525 | while (sector < bitmap->mddev->resync_max_sectors) { |
1526 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
b47490c9 N |
1527 | sector += blocks; |
1528 | } | |
1529 | } | |
ac2f40be | 1530 | EXPORT_SYMBOL(bitmap_close_sync); |
b47490c9 N |
1531 | |
1532 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) | |
1533 | { | |
1534 | sector_t s = 0; | |
57dab0bd | 1535 | sector_t blocks; |
b47490c9 N |
1536 | |
1537 | if (!bitmap) | |
1538 | return; | |
1539 | if (sector == 0) { | |
1540 | bitmap->last_end_sync = jiffies; | |
1541 | return; | |
1542 | } | |
1543 | if (time_before(jiffies, (bitmap->last_end_sync | |
1b04be96 | 1544 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1545 | return; |
1546 | wait_event(bitmap->mddev->recovery_wait, | |
1547 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1548 | ||
97e4f42d | 1549 | bitmap->mddev->curr_resync_completed = bitmap->mddev->curr_resync; |
070dc6dd | 1550 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
b47490c9 N |
1551 | sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1); |
1552 | s = 0; | |
1553 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
1554 | bitmap_end_sync(bitmap, s, &blocks, 0); | |
1555 | s += blocks; | |
32a7627c | 1556 | } |
b47490c9 | 1557 | bitmap->last_end_sync = jiffies; |
acb180b0 | 1558 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
32a7627c | 1559 | } |
ac2f40be | 1560 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
32a7627c | 1561 | |
6a07997f | 1562 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1563 | { |
1564 | /* For each chunk covered by any of these sectors, set the | |
193f1c93 | 1565 | * counter to 1 and set resync_needed. They should all |
32a7627c N |
1566 | * be 0 at this point |
1567 | */ | |
193f1c93 | 1568 | |
57dab0bd | 1569 | sector_t secs; |
193f1c93 N |
1570 | bitmap_counter_t *bmc; |
1571 | spin_lock_irq(&bitmap->lock); | |
1572 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); | |
1573 | if (!bmc) { | |
32a7627c | 1574 | spin_unlock_irq(&bitmap->lock); |
193f1c93 | 1575 | return; |
32a7627c | 1576 | } |
ac2f40be | 1577 | if (!*bmc) { |
193f1c93 | 1578 | struct page *page; |
ac2f40be | 1579 | *bmc = 1 | (needed ? NEEDED_MASK : 0); |
193f1c93 N |
1580 | bitmap_count_page(bitmap, offset, 1); |
1581 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); | |
1582 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1583 | } | |
1584 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1585 | bitmap->allclean = 0; |
32a7627c N |
1586 | } |
1587 | ||
9b1d1dac PC |
1588 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1589 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1590 | { | |
1591 | unsigned long chunk; | |
1592 | ||
1593 | for (chunk = s; chunk <= e; chunk++) { | |
db305e50 | 1594 | sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap); |
9b1d1dac PC |
1595 | bitmap_set_memory_bits(bitmap, sec, 1); |
1596 | bitmap_file_set_bit(bitmap, sec); | |
ffa23322 N |
1597 | if (sec < bitmap->mddev->recovery_cp) |
1598 | /* We are asserting that the array is dirty, | |
1599 | * so move the recovery_cp address back so | |
1600 | * that it is obvious that it is dirty | |
1601 | */ | |
1602 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1603 | } |
1604 | } | |
1605 | ||
6b8b3e8a N |
1606 | /* |
1607 | * flush out any pending updates | |
1608 | */ | |
1609 | void bitmap_flush(mddev_t *mddev) | |
1610 | { | |
1611 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1612 | long sleep; |
6b8b3e8a N |
1613 | |
1614 | if (!bitmap) /* there was no bitmap */ | |
1615 | return; | |
1616 | ||
1617 | /* run the daemon_work three time to ensure everything is flushed | |
1618 | * that can be | |
1619 | */ | |
1b04be96 | 1620 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1621 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1622 | bitmap_daemon_work(mddev); |
42a04b50 | 1623 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1624 | bitmap_daemon_work(mddev); |
42a04b50 | 1625 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1626 | bitmap_daemon_work(mddev); |
6b8b3e8a N |
1627 | bitmap_update_sb(bitmap); |
1628 | } | |
1629 | ||
32a7627c N |
1630 | /* |
1631 | * free memory that was allocated | |
1632 | */ | |
3178b0db | 1633 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1634 | { |
1635 | unsigned long k, pages; | |
1636 | struct bitmap_page *bp; | |
32a7627c N |
1637 | |
1638 | if (!bitmap) /* there was no bitmap */ | |
1639 | return; | |
1640 | ||
32a7627c N |
1641 | /* release the bitmap file and kill the daemon */ |
1642 | bitmap_file_put(bitmap); | |
1643 | ||
1644 | bp = bitmap->bp; | |
1645 | pages = bitmap->pages; | |
1646 | ||
1647 | /* free all allocated memory */ | |
1648 | ||
32a7627c N |
1649 | if (bp) /* deallocate the page memory */ |
1650 | for (k = 0; k < pages; k++) | |
1651 | if (bp[k].map && !bp[k].hijacked) | |
1652 | kfree(bp[k].map); | |
1653 | kfree(bp); | |
1654 | kfree(bitmap); | |
1655 | } | |
aa5cbd10 | 1656 | |
3178b0db N |
1657 | void bitmap_destroy(mddev_t *mddev) |
1658 | { | |
1659 | struct bitmap *bitmap = mddev->bitmap; | |
1660 | ||
1661 | if (!bitmap) /* there was no bitmap */ | |
1662 | return; | |
1663 | ||
c3d9714e | 1664 | mutex_lock(&mddev->bitmap_info.mutex); |
3178b0db | 1665 | mddev->bitmap = NULL; /* disconnect from the md device */ |
c3d9714e | 1666 | mutex_unlock(&mddev->bitmap_info.mutex); |
b15c2e57 N |
1667 | if (mddev->thread) |
1668 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db | 1669 | |
ece5cff0 N |
1670 | if (bitmap->sysfs_can_clear) |
1671 | sysfs_put(bitmap->sysfs_can_clear); | |
1672 | ||
3178b0db N |
1673 | bitmap_free(bitmap); |
1674 | } | |
32a7627c N |
1675 | |
1676 | /* | |
1677 | * initialize the bitmap structure | |
1678 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1679 | */ | |
1680 | int bitmap_create(mddev_t *mddev) | |
1681 | { | |
1682 | struct bitmap *bitmap; | |
1f593903 | 1683 | sector_t blocks = mddev->resync_max_sectors; |
32a7627c N |
1684 | unsigned long chunks; |
1685 | unsigned long pages; | |
c3d9714e | 1686 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1687 | int err; |
5ff5afff | 1688 | struct sysfs_dirent *bm = NULL; |
32a7627c | 1689 | |
5f6e3c83 | 1690 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1691 | |
e384e585 N |
1692 | if (!file |
1693 | && !mddev->bitmap_info.offset | |
1694 | && !mddev->bitmap_info.log) /* bitmap disabled, nothing to do */ | |
32a7627c N |
1695 | return 0; |
1696 | ||
c3d9714e | 1697 | BUG_ON(file && mddev->bitmap_info.offset); |
e384e585 | 1698 | BUG_ON(mddev->bitmap_info.offset && mddev->bitmap_info.log); |
a654b9d8 | 1699 | |
9ffae0cf | 1700 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c N |
1701 | if (!bitmap) |
1702 | return -ENOMEM; | |
1703 | ||
32a7627c | 1704 | spin_lock_init(&bitmap->lock); |
ce25c31b N |
1705 | atomic_set(&bitmap->pending_writes, 0); |
1706 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1707 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1708 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1709 | |
32a7627c | 1710 | bitmap->mddev = mddev; |
32a7627c | 1711 | |
5ff5afff N |
1712 | if (mddev->kobj.sd) |
1713 | bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap"); | |
ece5cff0 | 1714 | if (bm) { |
3ff195b0 | 1715 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear"); |
ece5cff0 N |
1716 | sysfs_put(bm); |
1717 | } else | |
1718 | bitmap->sysfs_can_clear = NULL; | |
1719 | ||
32a7627c | 1720 | bitmap->file = file; |
ce25c31b N |
1721 | if (file) { |
1722 | get_file(file); | |
ae8fa283 N |
1723 | /* As future accesses to this file will use bmap, |
1724 | * and bypass the page cache, we must sync the file | |
1725 | * first. | |
1726 | */ | |
8018ab05 | 1727 | vfs_fsync(file, 1); |
ce25c31b | 1728 | } |
42a04b50 | 1729 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
ece5cff0 N |
1730 | if (!mddev->bitmap_info.external) |
1731 | err = bitmap_read_sb(bitmap); | |
1732 | else { | |
1733 | err = 0; | |
1734 | if (mddev->bitmap_info.chunksize == 0 || | |
1735 | mddev->bitmap_info.daemon_sleep == 0) | |
1736 | /* chunksize and time_base need to be | |
1737 | * set first. */ | |
1738 | err = -EINVAL; | |
1739 | } | |
32a7627c | 1740 | if (err) |
3178b0db | 1741 | goto error; |
32a7627c | 1742 | |
624ce4f5 | 1743 | bitmap->daemon_lastrun = jiffies; |
42a04b50 | 1744 | bitmap->chunkshift = ffz(~mddev->bitmap_info.chunksize); |
32a7627c N |
1745 | |
1746 | /* now that chunksize and chunkshift are set, we can use these macros */ | |
ac2f40be | 1747 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) >> |
1f593903 | 1748 | CHUNK_BLOCK_SHIFT(bitmap); |
ac2f40be | 1749 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
32a7627c N |
1750 | |
1751 | BUG_ON(!pages); | |
1752 | ||
1753 | bitmap->chunks = chunks; | |
1754 | bitmap->pages = pages; | |
1755 | bitmap->missing_pages = pages; | |
1756 | bitmap->counter_bits = COUNTER_BITS; | |
1757 | ||
1758 | bitmap->syncchunk = ~0UL; | |
1759 | ||
44456d37 | 1760 | #ifdef INJECT_FATAL_FAULT_1 |
32a7627c N |
1761 | bitmap->bp = NULL; |
1762 | #else | |
9ffae0cf | 1763 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
32a7627c | 1764 | #endif |
3178b0db | 1765 | err = -ENOMEM; |
32a7627c | 1766 | if (!bitmap->bp) |
3178b0db | 1767 | goto error; |
32a7627c | 1768 | |
69e51b44 N |
1769 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
1770 | pages, bmname(bitmap)); | |
1771 | ||
1772 | mddev->bitmap = bitmap; | |
1773 | ||
1774 | ||
1775 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; | |
1776 | ||
1777 | error: | |
1778 | bitmap_free(bitmap); | |
1779 | return err; | |
1780 | } | |
1781 | ||
1782 | int bitmap_load(mddev_t *mddev) | |
1783 | { | |
1784 | int err = 0; | |
1785 | sector_t sector = 0; | |
1786 | struct bitmap *bitmap = mddev->bitmap; | |
1787 | ||
1788 | if (!bitmap) | |
1789 | goto out; | |
1790 | ||
1791 | /* Clear out old bitmap info first: Either there is none, or we | |
1792 | * are resuming after someone else has possibly changed things, | |
1793 | * so we should forget old cached info. | |
1794 | * All chunks should be clean, but some might need_sync. | |
1795 | */ | |
1796 | while (sector < mddev->resync_max_sectors) { | |
57dab0bd | 1797 | sector_t blocks; |
69e51b44 N |
1798 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
1799 | sector += blocks; | |
1800 | } | |
1801 | bitmap_close_sync(bitmap); | |
1802 | ||
e384e585 N |
1803 | if (mddev->bitmap_info.log) { |
1804 | unsigned long i; | |
1805 | struct dm_dirty_log *log = mddev->bitmap_info.log; | |
1806 | for (i = 0; i < bitmap->chunks; i++) | |
1807 | if (!log->type->in_sync(log, i, 1)) | |
1808 | bitmap_set_memory_bits(bitmap, | |
1809 | (sector_t)i << CHUNK_BLOCK_SHIFT(bitmap), | |
1810 | 1); | |
69e51b44 N |
1811 | } else { |
1812 | sector_t start = 0; | |
1813 | if (mddev->degraded == 0 | |
1814 | || bitmap->events_cleared == mddev->events) | |
1815 | /* no need to keep dirty bits to optimise a | |
1816 | * re-add of a missing device */ | |
1817 | start = mddev->recovery_cp; | |
193f1c93 | 1818 | |
69e51b44 N |
1819 | err = bitmap_init_from_disk(bitmap, start); |
1820 | } | |
32a7627c | 1821 | if (err) |
69e51b44 | 1822 | goto out; |
3178b0db | 1823 | |
1b04be96 | 1824 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
9cd30fdc | 1825 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 1826 | |
4ad13663 N |
1827 | bitmap_update_sb(bitmap); |
1828 | ||
69e51b44 N |
1829 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
1830 | err = -EIO; | |
1831 | out: | |
3178b0db | 1832 | return err; |
32a7627c | 1833 | } |
69e51b44 | 1834 | EXPORT_SYMBOL_GPL(bitmap_load); |
32a7627c | 1835 | |
43a70507 N |
1836 | static ssize_t |
1837 | location_show(mddev_t *mddev, char *page) | |
1838 | { | |
1839 | ssize_t len; | |
ac2f40be | 1840 | if (mddev->bitmap_info.file) |
43a70507 | 1841 | len = sprintf(page, "file"); |
ac2f40be | 1842 | else if (mddev->bitmap_info.offset) |
43a70507 | 1843 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 1844 | else |
43a70507 N |
1845 | len = sprintf(page, "none"); |
1846 | len += sprintf(page+len, "\n"); | |
1847 | return len; | |
1848 | } | |
1849 | ||
1850 | static ssize_t | |
1851 | location_store(mddev_t *mddev, const char *buf, size_t len) | |
1852 | { | |
1853 | ||
1854 | if (mddev->pers) { | |
1855 | if (!mddev->pers->quiesce) | |
1856 | return -EBUSY; | |
1857 | if (mddev->recovery || mddev->sync_thread) | |
1858 | return -EBUSY; | |
1859 | } | |
1860 | ||
1861 | if (mddev->bitmap || mddev->bitmap_info.file || | |
1862 | mddev->bitmap_info.offset) { | |
1863 | /* bitmap already configured. Only option is to clear it */ | |
1864 | if (strncmp(buf, "none", 4) != 0) | |
1865 | return -EBUSY; | |
1866 | if (mddev->pers) { | |
1867 | mddev->pers->quiesce(mddev, 1); | |
1868 | bitmap_destroy(mddev); | |
1869 | mddev->pers->quiesce(mddev, 0); | |
1870 | } | |
1871 | mddev->bitmap_info.offset = 0; | |
1872 | if (mddev->bitmap_info.file) { | |
1873 | struct file *f = mddev->bitmap_info.file; | |
1874 | mddev->bitmap_info.file = NULL; | |
1875 | restore_bitmap_write_access(f); | |
1876 | fput(f); | |
1877 | } | |
1878 | } else { | |
1879 | /* No bitmap, OK to set a location */ | |
1880 | long long offset; | |
1881 | if (strncmp(buf, "none", 4) == 0) | |
1882 | /* nothing to be done */; | |
1883 | else if (strncmp(buf, "file:", 5) == 0) { | |
1884 | /* Not supported yet */ | |
1885 | return -EINVAL; | |
1886 | } else { | |
1887 | int rv; | |
1888 | if (buf[0] == '+') | |
1889 | rv = strict_strtoll(buf+1, 10, &offset); | |
1890 | else | |
1891 | rv = strict_strtoll(buf, 10, &offset); | |
1892 | if (rv) | |
1893 | return rv; | |
1894 | if (offset == 0) | |
1895 | return -EINVAL; | |
ece5cff0 N |
1896 | if (mddev->bitmap_info.external == 0 && |
1897 | mddev->major_version == 0 && | |
43a70507 N |
1898 | offset != mddev->bitmap_info.default_offset) |
1899 | return -EINVAL; | |
1900 | mddev->bitmap_info.offset = offset; | |
1901 | if (mddev->pers) { | |
1902 | mddev->pers->quiesce(mddev, 1); | |
1903 | rv = bitmap_create(mddev); | |
1904 | if (rv) { | |
1905 | bitmap_destroy(mddev); | |
1906 | mddev->bitmap_info.offset = 0; | |
1907 | } | |
1908 | mddev->pers->quiesce(mddev, 0); | |
1909 | if (rv) | |
1910 | return rv; | |
1911 | } | |
1912 | } | |
1913 | } | |
1914 | if (!mddev->external) { | |
1915 | /* Ensure new bitmap info is stored in | |
1916 | * metadata promptly. | |
1917 | */ | |
1918 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1919 | md_wakeup_thread(mddev->thread); | |
1920 | } | |
1921 | return len; | |
1922 | } | |
1923 | ||
1924 | static struct md_sysfs_entry bitmap_location = | |
1925 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
1926 | ||
1927 | static ssize_t | |
1928 | timeout_show(mddev_t *mddev, char *page) | |
1929 | { | |
1930 | ssize_t len; | |
1931 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
1932 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 1933 | |
43a70507 N |
1934 | len = sprintf(page, "%lu", secs); |
1935 | if (jifs) | |
1936 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
1937 | len += sprintf(page+len, "\n"); | |
1938 | return len; | |
1939 | } | |
1940 | ||
1941 | static ssize_t | |
1942 | timeout_store(mddev_t *mddev, const char *buf, size_t len) | |
1943 | { | |
1944 | /* timeout can be set at any time */ | |
1945 | unsigned long timeout; | |
1946 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
1947 | if (rv) | |
1948 | return rv; | |
1949 | ||
1950 | /* just to make sure we don't overflow... */ | |
1951 | if (timeout >= LONG_MAX / HZ) | |
1952 | return -EINVAL; | |
1953 | ||
1954 | timeout = timeout * HZ / 10000; | |
1955 | ||
1956 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
1957 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
1958 | if (timeout < 1) | |
1959 | timeout = 1; | |
1960 | mddev->bitmap_info.daemon_sleep = timeout; | |
1961 | if (mddev->thread) { | |
1962 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then | |
1963 | * the bitmap is all clean and we don't need to | |
1964 | * adjust the timeout right now | |
1965 | */ | |
1966 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { | |
1967 | mddev->thread->timeout = timeout; | |
1968 | md_wakeup_thread(mddev->thread); | |
1969 | } | |
1970 | } | |
1971 | return len; | |
1972 | } | |
1973 | ||
1974 | static struct md_sysfs_entry bitmap_timeout = | |
1975 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
1976 | ||
1977 | static ssize_t | |
1978 | backlog_show(mddev_t *mddev, char *page) | |
1979 | { | |
1980 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
1981 | } | |
1982 | ||
1983 | static ssize_t | |
1984 | backlog_store(mddev_t *mddev, const char *buf, size_t len) | |
1985 | { | |
1986 | unsigned long backlog; | |
1987 | int rv = strict_strtoul(buf, 10, &backlog); | |
1988 | if (rv) | |
1989 | return rv; | |
1990 | if (backlog > COUNTER_MAX) | |
1991 | return -EINVAL; | |
1992 | mddev->bitmap_info.max_write_behind = backlog; | |
1993 | return len; | |
1994 | } | |
1995 | ||
1996 | static struct md_sysfs_entry bitmap_backlog = | |
1997 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
1998 | ||
1999 | static ssize_t | |
2000 | chunksize_show(mddev_t *mddev, char *page) | |
2001 | { | |
2002 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
2003 | } | |
2004 | ||
2005 | static ssize_t | |
2006 | chunksize_store(mddev_t *mddev, const char *buf, size_t len) | |
2007 | { | |
2008 | /* Can only be changed when no bitmap is active */ | |
2009 | int rv; | |
2010 | unsigned long csize; | |
2011 | if (mddev->bitmap) | |
2012 | return -EBUSY; | |
2013 | rv = strict_strtoul(buf, 10, &csize); | |
2014 | if (rv) | |
2015 | return rv; | |
2016 | if (csize < 512 || | |
2017 | !is_power_of_2(csize)) | |
2018 | return -EINVAL; | |
2019 | mddev->bitmap_info.chunksize = csize; | |
2020 | return len; | |
2021 | } | |
2022 | ||
2023 | static struct md_sysfs_entry bitmap_chunksize = | |
2024 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
2025 | ||
ece5cff0 N |
2026 | static ssize_t metadata_show(mddev_t *mddev, char *page) |
2027 | { | |
2028 | return sprintf(page, "%s\n", (mddev->bitmap_info.external | |
2029 | ? "external" : "internal")); | |
2030 | } | |
2031 | ||
2032 | static ssize_t metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2033 | { | |
2034 | if (mddev->bitmap || | |
2035 | mddev->bitmap_info.file || | |
2036 | mddev->bitmap_info.offset) | |
2037 | return -EBUSY; | |
2038 | if (strncmp(buf, "external", 8) == 0) | |
2039 | mddev->bitmap_info.external = 1; | |
2040 | else if (strncmp(buf, "internal", 8) == 0) | |
2041 | mddev->bitmap_info.external = 0; | |
2042 | else | |
2043 | return -EINVAL; | |
2044 | return len; | |
2045 | } | |
2046 | ||
2047 | static struct md_sysfs_entry bitmap_metadata = | |
2048 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
2049 | ||
2050 | static ssize_t can_clear_show(mddev_t *mddev, char *page) | |
2051 | { | |
2052 | int len; | |
2053 | if (mddev->bitmap) | |
2054 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
2055 | "false" : "true")); | |
2056 | else | |
2057 | len = sprintf(page, "\n"); | |
2058 | return len; | |
2059 | } | |
2060 | ||
2061 | static ssize_t can_clear_store(mddev_t *mddev, const char *buf, size_t len) | |
2062 | { | |
2063 | if (mddev->bitmap == NULL) | |
2064 | return -ENOENT; | |
2065 | if (strncmp(buf, "false", 5) == 0) | |
2066 | mddev->bitmap->need_sync = 1; | |
2067 | else if (strncmp(buf, "true", 4) == 0) { | |
2068 | if (mddev->degraded) | |
2069 | return -EBUSY; | |
2070 | mddev->bitmap->need_sync = 0; | |
2071 | } else | |
2072 | return -EINVAL; | |
2073 | return len; | |
2074 | } | |
2075 | ||
2076 | static struct md_sysfs_entry bitmap_can_clear = | |
2077 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
2078 | ||
696fcd53 PC |
2079 | static ssize_t |
2080 | behind_writes_used_show(mddev_t *mddev, char *page) | |
2081 | { | |
2082 | if (mddev->bitmap == NULL) | |
2083 | return sprintf(page, "0\n"); | |
2084 | return sprintf(page, "%lu\n", | |
2085 | mddev->bitmap->behind_writes_used); | |
2086 | } | |
2087 | ||
2088 | static ssize_t | |
2089 | behind_writes_used_reset(mddev_t *mddev, const char *buf, size_t len) | |
2090 | { | |
2091 | if (mddev->bitmap) | |
2092 | mddev->bitmap->behind_writes_used = 0; | |
2093 | return len; | |
2094 | } | |
2095 | ||
2096 | static struct md_sysfs_entry max_backlog_used = | |
2097 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2098 | behind_writes_used_show, behind_writes_used_reset); | |
2099 | ||
43a70507 N |
2100 | static struct attribute *md_bitmap_attrs[] = { |
2101 | &bitmap_location.attr, | |
2102 | &bitmap_timeout.attr, | |
2103 | &bitmap_backlog.attr, | |
2104 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2105 | &bitmap_metadata.attr, |
2106 | &bitmap_can_clear.attr, | |
696fcd53 | 2107 | &max_backlog_used.attr, |
43a70507 N |
2108 | NULL |
2109 | }; | |
2110 | struct attribute_group md_bitmap_group = { | |
2111 | .name = "bitmap", | |
2112 | .attrs = md_bitmap_attrs, | |
2113 | }; | |
2114 |