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). | |
16 | * wait if count gets too high, wake when it drops to half. | |
32a7627c N |
17 | */ |
18 | ||
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> | |
29 | #include <linux/raid/md.h> | |
30 | #include <linux/raid/bitmap.h> | |
31 | ||
32 | /* debug macros */ | |
33 | ||
34 | #define DEBUG 0 | |
35 | ||
36 | #if DEBUG | |
37 | /* these are for debugging purposes only! */ | |
38 | ||
39 | /* define one and only one of these */ | |
40 | #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */ | |
41 | #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/ | |
42 | #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */ | |
43 | #define INJECT_FAULTS_4 0 /* undef */ | |
44 | #define INJECT_FAULTS_5 0 /* undef */ | |
45 | #define INJECT_FAULTS_6 0 | |
46 | ||
47 | /* if these are defined, the driver will fail! debug only */ | |
48 | #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */ | |
49 | #define INJECT_FATAL_FAULT_2 0 /* undef */ | |
50 | #define INJECT_FATAL_FAULT_3 0 /* undef */ | |
51 | #endif | |
52 | ||
53 | //#define DPRINTK PRINTK /* set this NULL to avoid verbose debug output */ | |
54 | #define DPRINTK(x...) do { } while(0) | |
55 | ||
56 | #ifndef PRINTK | |
57 | # if DEBUG > 0 | |
58 | # define PRINTK(x...) printk(KERN_DEBUG x) | |
59 | # else | |
60 | # define PRINTK(x...) | |
61 | # endif | |
62 | #endif | |
63 | ||
64 | static inline char * bmname(struct bitmap *bitmap) | |
65 | { | |
66 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; | |
67 | } | |
68 | ||
32a7627c N |
69 | |
70 | /* | |
71 | * just a placeholder - calls kmalloc for bitmap pages | |
72 | */ | |
73 | static unsigned char *bitmap_alloc_page(struct bitmap *bitmap) | |
74 | { | |
75 | unsigned char *page; | |
76 | ||
44456d37 | 77 | #ifdef INJECT_FAULTS_1 |
32a7627c N |
78 | page = NULL; |
79 | #else | |
80 | page = kmalloc(PAGE_SIZE, GFP_NOIO); | |
81 | #endif | |
82 | if (!page) | |
83 | printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap)); | |
84 | else | |
a654b9d8 | 85 | PRINTK("%s: bitmap_alloc_page: allocated page at %p\n", |
32a7627c N |
86 | bmname(bitmap), page); |
87 | return page; | |
88 | } | |
89 | ||
90 | /* | |
91 | * for now just a placeholder -- just calls kfree for bitmap pages | |
92 | */ | |
93 | static void bitmap_free_page(struct bitmap *bitmap, unsigned char *page) | |
94 | { | |
95 | PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap), page); | |
96 | kfree(page); | |
97 | } | |
98 | ||
99 | /* | |
100 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) | |
101 | * | |
102 | * 1) check to see if this page is allocated, if it's not then try to alloc | |
103 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the | |
104 | * page pointer directly as a counter | |
105 | * | |
106 | * if we find our page, we increment the page's refcount so that it stays | |
107 | * allocated while we're using it | |
108 | */ | |
109 | static int bitmap_checkpage(struct bitmap *bitmap, unsigned long page, int create) | |
110 | { | |
111 | unsigned char *mappage; | |
112 | ||
113 | if (page >= bitmap->pages) { | |
114 | printk(KERN_ALERT | |
115 | "%s: invalid bitmap page request: %lu (> %lu)\n", | |
116 | bmname(bitmap), page, bitmap->pages-1); | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
120 | ||
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 | ||
130 | spin_unlock_irq(&bitmap->lock); | |
131 | ||
132 | /* this page has not been allocated yet */ | |
133 | ||
134 | if ((mappage = bitmap_alloc_page(bitmap)) == NULL) { | |
135 | PRINTK("%s: bitmap map page allocation failed, hijacking\n", | |
136 | bmname(bitmap)); | |
137 | /* failed - set the hijacked flag so that we can use the | |
138 | * pointer as a counter */ | |
139 | spin_lock_irq(&bitmap->lock); | |
140 | if (!bitmap->bp[page].map) | |
141 | bitmap->bp[page].hijacked = 1; | |
142 | goto out; | |
143 | } | |
144 | ||
145 | /* got a page */ | |
146 | ||
147 | spin_lock_irq(&bitmap->lock); | |
148 | ||
149 | /* recheck the page */ | |
150 | ||
151 | if (bitmap->bp[page].map || bitmap->bp[page].hijacked) { | |
152 | /* somebody beat us to getting the page */ | |
153 | bitmap_free_page(bitmap, mappage); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* no page was in place and we have one, so install it */ | |
158 | ||
159 | memset(mappage, 0, PAGE_SIZE); | |
160 | bitmap->bp[page].map = mappage; | |
161 | bitmap->missing_pages--; | |
162 | out: | |
163 | return 0; | |
164 | } | |
165 | ||
166 | ||
167 | /* if page is completely empty, put it back on the free list, or dealloc it */ | |
168 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
169 | /* Note: lock should be held when calling this */ | |
858119e1 | 170 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
32a7627c N |
171 | { |
172 | char *ptr; | |
173 | ||
174 | if (bitmap->bp[page].count) /* page is still busy */ | |
175 | return; | |
176 | ||
177 | /* page is no longer in use, it can be released */ | |
178 | ||
179 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
180 | bitmap->bp[page].hijacked = 0; | |
181 | bitmap->bp[page].map = NULL; | |
182 | return; | |
183 | } | |
184 | ||
185 | /* normal case, free the page */ | |
186 | ||
187 | #if 0 | |
188 | /* actually ... let's not. We will probably need the page again exactly when | |
189 | * memory is tight and we are flusing to disk | |
190 | */ | |
191 | return; | |
192 | #else | |
193 | ptr = bitmap->bp[page].map; | |
194 | bitmap->bp[page].map = NULL; | |
195 | bitmap->missing_pages++; | |
196 | bitmap_free_page(bitmap, ptr); | |
197 | return; | |
198 | #endif | |
199 | } | |
200 | ||
201 | ||
202 | /* | |
203 | * bitmap file handling - read and write the bitmap file and its superblock | |
204 | */ | |
205 | ||
206 | /* copy the pathname of a file to a buffer */ | |
207 | char *file_path(struct file *file, char *buf, int count) | |
208 | { | |
32a7627c N |
209 | if (!buf) |
210 | return NULL; | |
211 | ||
cf28b486 | 212 | buf = d_path(&file->f_path, buf, count); |
32a7627c N |
213 | |
214 | return IS_ERR(buf) ? NULL : buf; | |
215 | } | |
216 | ||
217 | /* | |
218 | * basic page I/O operations | |
219 | */ | |
220 | ||
a654b9d8 N |
221 | /* IO operations when bitmap is stored near all superblocks */ |
222 | static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long index) | |
223 | { | |
224 | /* choose a good rdev and read the page from there */ | |
225 | ||
226 | mdk_rdev_t *rdev; | |
227 | struct list_head *tmp; | |
228 | struct page *page = alloc_page(GFP_KERNEL); | |
229 | sector_t target; | |
230 | ||
231 | if (!page) | |
232 | return ERR_PTR(-ENOMEM); | |
a654b9d8 | 233 | |
d089c6af | 234 | rdev_for_each(rdev, tmp, mddev) { |
b2d444d7 N |
235 | if (! test_bit(In_sync, &rdev->flags) |
236 | || test_bit(Faulty, &rdev->flags)) | |
ab904d63 N |
237 | continue; |
238 | ||
a654b9d8 N |
239 | target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512); |
240 | ||
ab904d63 N |
241 | if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) { |
242 | page->index = index; | |
ce25c31b N |
243 | attach_page_buffers(page, NULL); /* so that free_buffer will |
244 | * quietly no-op */ | |
ab904d63 N |
245 | return page; |
246 | } | |
247 | } | |
248 | return ERR_PTR(-EIO); | |
a654b9d8 | 249 | |
a654b9d8 N |
250 | } |
251 | ||
ab6085c7 | 252 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
a654b9d8 N |
253 | { |
254 | mdk_rdev_t *rdev; | |
255 | struct list_head *tmp; | |
ab6085c7 | 256 | mddev_t *mddev = bitmap->mddev; |
a654b9d8 | 257 | |
d089c6af | 258 | rdev_for_each(rdev, tmp, mddev) |
b2d444d7 | 259 | if (test_bit(In_sync, &rdev->flags) |
ab6085c7 N |
260 | && !test_bit(Faulty, &rdev->flags)) { |
261 | int size = PAGE_SIZE; | |
262 | if (page->index == bitmap->file_pages-1) | |
263 | size = roundup(bitmap->last_page_size, | |
264 | bdev_hardsect_size(rdev->bdev)); | |
f0d76d70 N |
265 | /* Just make sure we aren't corrupting data or |
266 | * metadata | |
267 | */ | |
268 | if (bitmap->offset < 0) { | |
269 | /* DATA BITMAP METADATA */ | |
270 | if (bitmap->offset | |
85bfb4da | 271 | + (long)(page->index * (PAGE_SIZE/512)) |
f0d76d70 N |
272 | + size/512 > 0) |
273 | /* bitmap runs in to metadata */ | |
274 | return -EINVAL; | |
275 | if (rdev->data_offset + mddev->size*2 | |
276 | > rdev->sb_offset*2 + bitmap->offset) | |
277 | /* data runs in to bitmap */ | |
278 | return -EINVAL; | |
279 | } else if (rdev->sb_offset*2 < rdev->data_offset) { | |
280 | /* METADATA BITMAP DATA */ | |
281 | if (rdev->sb_offset*2 | |
282 | + bitmap->offset | |
283 | + page->index*(PAGE_SIZE/512) + size/512 | |
284 | > rdev->data_offset) | |
285 | /* bitmap runs in to data */ | |
286 | return -EINVAL; | |
287 | } else { | |
288 | /* DATA METADATA BITMAP - no problems */ | |
289 | } | |
a654b9d8 | 290 | md_super_write(mddev, rdev, |
ab6085c7 | 291 | (rdev->sb_offset<<1) + bitmap->offset |
a654b9d8 | 292 | + page->index * (PAGE_SIZE/512), |
ab6085c7 | 293 | size, |
a654b9d8 | 294 | page); |
ab6085c7 | 295 | } |
a654b9d8 N |
296 | |
297 | if (wait) | |
a9701a30 | 298 | md_super_wait(mddev); |
a654b9d8 N |
299 | return 0; |
300 | } | |
301 | ||
4ad13663 | 302 | static void bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 303 | /* |
a654b9d8 | 304 | * write out a page to a file |
32a7627c | 305 | */ |
4ad13663 | 306 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 307 | { |
d785a06a | 308 | struct buffer_head *bh; |
32a7627c | 309 | |
f0d76d70 N |
310 | if (bitmap->file == NULL) { |
311 | switch (write_sb_page(bitmap, page, wait)) { | |
312 | case -EINVAL: | |
313 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
f0d76d70 | 314 | } |
4ad13663 | 315 | } else { |
a654b9d8 | 316 | |
4ad13663 | 317 | bh = page_buffers(page); |
c708443c | 318 | |
4ad13663 N |
319 | while (bh && bh->b_blocknr) { |
320 | atomic_inc(&bitmap->pending_writes); | |
321 | set_buffer_locked(bh); | |
322 | set_buffer_mapped(bh); | |
323 | submit_bh(WRITE, bh); | |
324 | bh = bh->b_this_page; | |
325 | } | |
d785a06a | 326 | |
4ad13663 N |
327 | if (wait) { |
328 | wait_event(bitmap->write_wait, | |
329 | atomic_read(&bitmap->pending_writes)==0); | |
330 | } | |
8a5e9cf1 | 331 | } |
4ad13663 N |
332 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
333 | bitmap_file_kick(bitmap); | |
d785a06a N |
334 | } |
335 | ||
336 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
337 | { | |
338 | struct bitmap *bitmap = bh->b_private; | |
339 | unsigned long flags; | |
32a7627c | 340 | |
d785a06a N |
341 | if (!uptodate) { |
342 | spin_lock_irqsave(&bitmap->lock, flags); | |
343 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
344 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
32a7627c | 345 | } |
d785a06a N |
346 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
347 | wake_up(&bitmap->write_wait); | |
348 | } | |
32a7627c | 349 | |
d785a06a N |
350 | /* copied from buffer.c */ |
351 | static void | |
352 | __clear_page_buffers(struct page *page) | |
353 | { | |
354 | ClearPagePrivate(page); | |
355 | set_page_private(page, 0); | |
356 | page_cache_release(page); | |
357 | } | |
358 | static void free_buffers(struct page *page) | |
359 | { | |
360 | struct buffer_head *bh = page_buffers(page); | |
77ad4bc7 | 361 | |
d785a06a N |
362 | while (bh) { |
363 | struct buffer_head *next = bh->b_this_page; | |
364 | free_buffer_head(bh); | |
365 | bh = next; | |
77ad4bc7 | 366 | } |
d785a06a N |
367 | __clear_page_buffers(page); |
368 | put_page(page); | |
32a7627c N |
369 | } |
370 | ||
d785a06a N |
371 | /* read a page from a file. |
372 | * We both read the page, and attach buffers to the page to record the | |
373 | * address of each block (using bmap). These addresses will be used | |
374 | * to write the block later, completely bypassing the filesystem. | |
375 | * This usage is similar to how swap files are handled, and allows us | |
376 | * to write to a file with no concerns of memory allocation failing. | |
377 | */ | |
32a7627c | 378 | static struct page *read_page(struct file *file, unsigned long index, |
d785a06a N |
379 | struct bitmap *bitmap, |
380 | unsigned long count) | |
32a7627c | 381 | { |
32a7627c | 382 | struct page *page = NULL; |
c649bb9c | 383 | struct inode *inode = file->f_path.dentry->d_inode; |
d785a06a N |
384 | struct buffer_head *bh; |
385 | sector_t block; | |
32a7627c | 386 | |
2d1f3b5d N |
387 | PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_SIZE, |
388 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 389 | |
d785a06a N |
390 | page = alloc_page(GFP_KERNEL); |
391 | if (!page) | |
392 | page = ERR_PTR(-ENOMEM); | |
32a7627c N |
393 | if (IS_ERR(page)) |
394 | goto out; | |
d785a06a | 395 | |
d785a06a N |
396 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
397 | if (!bh) { | |
2d1f3b5d | 398 | put_page(page); |
d785a06a | 399 | page = ERR_PTR(-ENOMEM); |
32a7627c N |
400 | goto out; |
401 | } | |
d785a06a N |
402 | attach_page_buffers(page, bh); |
403 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
404 | while (bh) { | |
405 | if (count == 0) | |
406 | bh->b_blocknr = 0; | |
407 | else { | |
408 | bh->b_blocknr = bmap(inode, block); | |
409 | if (bh->b_blocknr == 0) { | |
410 | /* Cannot use this file! */ | |
411 | free_buffers(page); | |
412 | page = ERR_PTR(-EINVAL); | |
413 | goto out; | |
414 | } | |
415 | bh->b_bdev = inode->i_sb->s_bdev; | |
416 | if (count < (1<<inode->i_blkbits)) | |
417 | count = 0; | |
418 | else | |
419 | count -= (1<<inode->i_blkbits); | |
420 | ||
421 | bh->b_end_io = end_bitmap_write; | |
422 | bh->b_private = bitmap; | |
ce25c31b N |
423 | atomic_inc(&bitmap->pending_writes); |
424 | set_buffer_locked(bh); | |
425 | set_buffer_mapped(bh); | |
426 | submit_bh(READ, bh); | |
d785a06a N |
427 | } |
428 | block++; | |
429 | bh = bh->b_this_page; | |
430 | } | |
d785a06a | 431 | page->index = index; |
ce25c31b N |
432 | |
433 | wait_event(bitmap->write_wait, | |
434 | atomic_read(&bitmap->pending_writes)==0); | |
435 | if (bitmap->flags & BITMAP_WRITE_ERROR) { | |
436 | free_buffers(page); | |
437 | page = ERR_PTR(-EIO); | |
438 | } | |
32a7627c N |
439 | out: |
440 | if (IS_ERR(page)) | |
441 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %Lu): %ld\n", | |
2d1f3b5d N |
442 | (int)PAGE_SIZE, |
443 | (unsigned long long)index << PAGE_SHIFT, | |
32a7627c N |
444 | PTR_ERR(page)); |
445 | return page; | |
446 | } | |
447 | ||
448 | /* | |
449 | * bitmap file superblock operations | |
450 | */ | |
451 | ||
452 | /* update the event counter and sync the superblock to disk */ | |
4ad13663 | 453 | void bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
454 | { |
455 | bitmap_super_t *sb; | |
456 | unsigned long flags; | |
457 | ||
458 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 459 | return; |
32a7627c N |
460 | spin_lock_irqsave(&bitmap->lock, flags); |
461 | if (!bitmap->sb_page) { /* no superblock */ | |
462 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 463 | return; |
32a7627c | 464 | } |
32a7627c | 465 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ea03aff9 | 466 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c N |
467 | sb->events = cpu_to_le64(bitmap->mddev->events); |
468 | if (!bitmap->mddev->degraded) | |
469 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
ea03aff9 | 470 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 471 | write_page(bitmap, bitmap->sb_page, 1); |
32a7627c N |
472 | } |
473 | ||
474 | /* print out the bitmap file superblock */ | |
475 | void bitmap_print_sb(struct bitmap *bitmap) | |
476 | { | |
477 | bitmap_super_t *sb; | |
478 | ||
479 | if (!bitmap || !bitmap->sb_page) | |
480 | return; | |
ea03aff9 | 481 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 482 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
483 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
484 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
485 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
486 | *(__u32 *)(sb->uuid+0), |
487 | *(__u32 *)(sb->uuid+4), | |
488 | *(__u32 *)(sb->uuid+8), | |
489 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 490 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 491 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 492 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 493 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
494 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
495 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
496 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
497 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
498 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 499 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
ea03aff9 | 500 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
501 | } |
502 | ||
503 | /* read the superblock from the bitmap file and initialize some bitmap fields */ | |
504 | static int bitmap_read_sb(struct bitmap *bitmap) | |
505 | { | |
506 | char *reason = NULL; | |
507 | bitmap_super_t *sb; | |
4b6d287f | 508 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c N |
509 | unsigned long long events; |
510 | int err = -EINVAL; | |
511 | ||
512 | /* page 0 is the superblock, read it... */ | |
f49d5e62 N |
513 | if (bitmap->file) { |
514 | loff_t isize = i_size_read(bitmap->file->f_mapping->host); | |
515 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; | |
516 | ||
517 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes); | |
518 | } else { | |
a654b9d8 | 519 | bitmap->sb_page = read_sb_page(bitmap->mddev, bitmap->offset, 0); |
a654b9d8 | 520 | } |
32a7627c N |
521 | if (IS_ERR(bitmap->sb_page)) { |
522 | err = PTR_ERR(bitmap->sb_page); | |
523 | bitmap->sb_page = NULL; | |
524 | return err; | |
525 | } | |
526 | ||
ea03aff9 | 527 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 528 | |
32a7627c N |
529 | chunksize = le32_to_cpu(sb->chunksize); |
530 | daemon_sleep = le32_to_cpu(sb->daemon_sleep); | |
4b6d287f | 531 | write_behind = le32_to_cpu(sb->write_behind); |
32a7627c N |
532 | |
533 | /* verify that the bitmap-specific fields are valid */ | |
534 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
535 | reason = "bad magic"; | |
bd926c63 N |
536 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
537 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) | |
32a7627c | 538 | reason = "unrecognized superblock version"; |
7dd5d34c N |
539 | else if (chunksize < PAGE_SIZE) |
540 | reason = "bitmap chunksize too small"; | |
32a7627c N |
541 | else if ((1 << ffz(~chunksize)) != chunksize) |
542 | reason = "bitmap chunksize not a power of 2"; | |
7dd5d34c N |
543 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT / HZ) |
544 | reason = "daemon sleep period out of range"; | |
4b6d287f N |
545 | else if (write_behind > COUNTER_MAX) |
546 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
547 | if (reason) { |
548 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
549 | bmname(bitmap), reason); | |
550 | goto out; | |
551 | } | |
552 | ||
553 | /* keep the array size field of the bitmap superblock up to date */ | |
554 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
555 | ||
556 | if (!bitmap->mddev->persistent) | |
557 | goto success; | |
558 | ||
559 | /* | |
560 | * if we have a persistent array superblock, compare the | |
561 | * bitmap's UUID and event counter to the mddev's | |
562 | */ | |
563 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
564 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", | |
565 | bmname(bitmap)); | |
566 | goto out; | |
567 | } | |
568 | events = le64_to_cpu(sb->events); | |
569 | if (events < bitmap->mddev->events) { | |
570 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " | |
571 | "-- forcing full recovery\n", bmname(bitmap), events, | |
572 | (unsigned long long) bitmap->mddev->events); | |
4f2e639a | 573 | sb->state |= cpu_to_le32(BITMAP_STALE); |
32a7627c N |
574 | } |
575 | success: | |
576 | /* assign fields using values from superblock */ | |
577 | bitmap->chunksize = chunksize; | |
578 | bitmap->daemon_sleep = daemon_sleep; | |
585f0dd5 | 579 | bitmap->daemon_lastrun = jiffies; |
4b6d287f | 580 | bitmap->max_write_behind = write_behind; |
4f2e639a | 581 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 N |
582 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
583 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
32a7627c | 584 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
4f2e639a | 585 | if (sb->state & cpu_to_le32(BITMAP_STALE)) |
6a07997f | 586 | bitmap->events_cleared = bitmap->mddev->events; |
32a7627c N |
587 | err = 0; |
588 | out: | |
ea03aff9 | 589 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
590 | if (err) |
591 | bitmap_print_sb(bitmap); | |
592 | return err; | |
593 | } | |
594 | ||
595 | enum bitmap_mask_op { | |
596 | MASK_SET, | |
597 | MASK_UNSET | |
598 | }; | |
599 | ||
4ad13663 N |
600 | /* record the state of the bitmap in the superblock. Return the old value */ |
601 | static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, | |
602 | enum bitmap_mask_op op) | |
32a7627c N |
603 | { |
604 | bitmap_super_t *sb; | |
605 | unsigned long flags; | |
4ad13663 | 606 | int old; |
32a7627c N |
607 | |
608 | spin_lock_irqsave(&bitmap->lock, flags); | |
7e317655 | 609 | if (!bitmap->sb_page) { /* can't set the state */ |
32a7627c | 610 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 611 | return 0; |
32a7627c | 612 | } |
32a7627c | 613 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ea03aff9 | 614 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
4ad13663 | 615 | old = le32_to_cpu(sb->state) & bits; |
32a7627c | 616 | switch (op) { |
4f2e639a | 617 | case MASK_SET: sb->state |= cpu_to_le32(bits); |
32a7627c | 618 | break; |
4f2e639a | 619 | case MASK_UNSET: sb->state &= cpu_to_le32(~bits); |
32a7627c N |
620 | break; |
621 | default: BUG(); | |
622 | } | |
ea03aff9 | 623 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 624 | return old; |
32a7627c N |
625 | } |
626 | ||
627 | /* | |
628 | * general bitmap file operations | |
629 | */ | |
630 | ||
631 | /* calculate the index of the page that contains this bit */ | |
632 | static inline unsigned long file_page_index(unsigned long chunk) | |
633 | { | |
634 | return CHUNK_BIT_OFFSET(chunk) >> PAGE_BIT_SHIFT; | |
635 | } | |
636 | ||
637 | /* calculate the (bit) offset of this bit within a page */ | |
638 | static inline unsigned long file_page_offset(unsigned long chunk) | |
639 | { | |
640 | return CHUNK_BIT_OFFSET(chunk) & (PAGE_BITS - 1); | |
641 | } | |
642 | ||
643 | /* | |
644 | * return a pointer to the page in the filemap that contains the given bit | |
645 | * | |
646 | * this lookup is complicated by the fact that the bitmap sb might be exactly | |
647 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page | |
648 | * 0 or page 1 | |
649 | */ | |
650 | static inline struct page *filemap_get_page(struct bitmap *bitmap, | |
651 | unsigned long chunk) | |
652 | { | |
9b1d1dac | 653 | if (file_page_index(chunk) >= bitmap->file_pages) return NULL; |
32a7627c N |
654 | return bitmap->filemap[file_page_index(chunk) - file_page_index(0)]; |
655 | } | |
656 | ||
657 | ||
658 | static void bitmap_file_unmap(struct bitmap *bitmap) | |
659 | { | |
660 | struct page **map, *sb_page; | |
661 | unsigned long *attr; | |
662 | int pages; | |
663 | unsigned long flags; | |
664 | ||
665 | spin_lock_irqsave(&bitmap->lock, flags); | |
666 | map = bitmap->filemap; | |
667 | bitmap->filemap = NULL; | |
668 | attr = bitmap->filemap_attr; | |
669 | bitmap->filemap_attr = NULL; | |
670 | pages = bitmap->file_pages; | |
671 | bitmap->file_pages = 0; | |
672 | sb_page = bitmap->sb_page; | |
673 | bitmap->sb_page = NULL; | |
674 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
675 | ||
676 | while (pages--) | |
677 | if (map[pages]->index != 0) /* 0 is sb_page, release it below */ | |
d785a06a | 678 | free_buffers(map[pages]); |
32a7627c N |
679 | kfree(map); |
680 | kfree(attr); | |
681 | ||
d785a06a N |
682 | if (sb_page) |
683 | free_buffers(sb_page); | |
32a7627c N |
684 | } |
685 | ||
686 | static void bitmap_file_put(struct bitmap *bitmap) | |
687 | { | |
688 | struct file *file; | |
32a7627c N |
689 | unsigned long flags; |
690 | ||
691 | spin_lock_irqsave(&bitmap->lock, flags); | |
692 | file = bitmap->file; | |
693 | bitmap->file = NULL; | |
694 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
695 | ||
d785a06a N |
696 | if (file) |
697 | wait_event(bitmap->write_wait, | |
698 | atomic_read(&bitmap->pending_writes)==0); | |
32a7627c N |
699 | bitmap_file_unmap(bitmap); |
700 | ||
d785a06a | 701 | if (file) { |
c649bb9c | 702 | struct inode *inode = file->f_path.dentry->d_inode; |
fc0ecff6 | 703 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 704 | fput(file); |
d785a06a | 705 | } |
32a7627c N |
706 | } |
707 | ||
708 | ||
709 | /* | |
710 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
711 | * then it is no longer reliable, so we stop using it and we mark the file | |
712 | * as failed in the superblock | |
713 | */ | |
714 | static void bitmap_file_kick(struct bitmap *bitmap) | |
715 | { | |
716 | char *path, *ptr = NULL; | |
717 | ||
4ad13663 N |
718 | if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) { |
719 | bitmap_update_sb(bitmap); | |
32a7627c | 720 | |
4ad13663 N |
721 | if (bitmap->file) { |
722 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
723 | if (path) | |
724 | ptr = file_path(bitmap->file, path, PAGE_SIZE); | |
32a7627c | 725 | |
4ad13663 N |
726 | printk(KERN_ALERT |
727 | "%s: kicking failed bitmap file %s from array!\n", | |
728 | bmname(bitmap), ptr ? ptr : ""); | |
32a7627c | 729 | |
4ad13663 N |
730 | kfree(path); |
731 | } else | |
732 | printk(KERN_ALERT | |
733 | "%s: disabling internal bitmap due to errors\n", | |
734 | bmname(bitmap)); | |
a654b9d8 | 735 | } |
32a7627c N |
736 | |
737 | bitmap_file_put(bitmap); | |
738 | ||
739 | return; | |
740 | } | |
741 | ||
742 | enum bitmap_page_attr { | |
e16b68b6 N |
743 | BITMAP_PAGE_DIRTY = 0, // there are set bits that need to be synced |
744 | BITMAP_PAGE_CLEAN = 1, // there are bits that might need to be cleared | |
745 | BITMAP_PAGE_NEEDWRITE=2, // there are cleared bits that need to be synced | |
32a7627c N |
746 | }; |
747 | ||
748 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, | |
749 | enum bitmap_page_attr attr) | |
750 | { | |
e16b68b6 | 751 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
752 | } |
753 | ||
754 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, | |
755 | enum bitmap_page_attr attr) | |
756 | { | |
e16b68b6 | 757 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
758 | } |
759 | ||
ec7a3197 N |
760 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
761 | enum bitmap_page_attr attr) | |
32a7627c | 762 | { |
e16b68b6 | 763 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
764 | } |
765 | ||
766 | /* | |
767 | * bitmap_file_set_bit -- called before performing a write to the md device | |
768 | * to set (and eventually sync) a particular bit in the bitmap file | |
769 | * | |
770 | * we set the bit immediately, then we record the page number so that | |
771 | * when an unplug occurs, we can flush the dirty pages out to disk | |
772 | */ | |
773 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
774 | { | |
775 | unsigned long bit; | |
776 | struct page *page; | |
777 | void *kaddr; | |
778 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); | |
779 | ||
a654b9d8 | 780 | if (!bitmap->filemap) { |
32a7627c N |
781 | return; |
782 | } | |
783 | ||
784 | page = filemap_get_page(bitmap, chunk); | |
9b1d1dac | 785 | if (!page) return; |
32a7627c N |
786 | bit = file_page_offset(chunk); |
787 | ||
32a7627c N |
788 | /* set the bit */ |
789 | kaddr = kmap_atomic(page, KM_USER0); | |
bd926c63 N |
790 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
791 | set_bit(bit, kaddr); | |
792 | else | |
793 | ext2_set_bit(bit, kaddr); | |
32a7627c N |
794 | kunmap_atomic(kaddr, KM_USER0); |
795 | PRINTK("set file bit %lu page %lu\n", bit, page->index); | |
796 | ||
797 | /* record page number so it gets flushed to disk when unplug occurs */ | |
798 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); | |
799 | ||
800 | } | |
801 | ||
802 | /* this gets called when the md device is ready to unplug its underlying | |
803 | * (slave) device queues -- before we let any writes go down, we need to | |
804 | * sync the dirty pages of the bitmap file to disk */ | |
4ad13663 | 805 | void bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 806 | { |
ec7a3197 N |
807 | unsigned long i, flags; |
808 | int dirty, need_write; | |
32a7627c N |
809 | struct page *page; |
810 | int wait = 0; | |
811 | ||
812 | if (!bitmap) | |
4ad13663 | 813 | return; |
32a7627c N |
814 | |
815 | /* look at each page to see if there are any set bits that need to be | |
816 | * flushed out to disk */ | |
817 | for (i = 0; i < bitmap->file_pages; i++) { | |
818 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 819 | if (!bitmap->filemap) { |
32a7627c | 820 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 821 | return; |
32a7627c N |
822 | } |
823 | page = bitmap->filemap[i]; | |
ec7a3197 N |
824 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
825 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
32a7627c N |
826 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
827 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
ec7a3197 | 828 | if (dirty) |
32a7627c N |
829 | wait = 1; |
830 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
831 | ||
d785a06a | 832 | if (dirty | need_write) |
4ad13663 | 833 | write_page(bitmap, page, 0); |
32a7627c N |
834 | } |
835 | if (wait) { /* if any writes were performed, we need to wait on them */ | |
0b79ccf0 | 836 | if (bitmap->file) |
d785a06a N |
837 | wait_event(bitmap->write_wait, |
838 | atomic_read(&bitmap->pending_writes)==0); | |
0b79ccf0 | 839 | else |
a9701a30 | 840 | md_super_wait(bitmap->mddev); |
32a7627c | 841 | } |
d785a06a N |
842 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
843 | bitmap_file_kick(bitmap); | |
32a7627c N |
844 | } |
845 | ||
6a07997f | 846 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
847 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
848 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
849 | * memory mapping of the bitmap file | |
850 | * Special cases: | |
851 | * if there's no bitmap file, or if the bitmap file had been | |
852 | * previously kicked from the array, we mark all the bits as | |
853 | * 1's in order to cause a full resync. | |
6a07997f N |
854 | * |
855 | * We ignore all bits for sectors that end earlier than 'start'. | |
856 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 857 | */ |
6a07997f | 858 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c N |
859 | { |
860 | unsigned long i, chunks, index, oldindex, bit; | |
861 | struct page *page = NULL, *oldpage = NULL; | |
862 | unsigned long num_pages, bit_cnt = 0; | |
863 | struct file *file; | |
d785a06a | 864 | unsigned long bytes, offset; |
32a7627c N |
865 | int outofdate; |
866 | int ret = -ENOSPC; | |
ea03aff9 | 867 | void *paddr; |
32a7627c N |
868 | |
869 | chunks = bitmap->chunks; | |
870 | file = bitmap->file; | |
871 | ||
a654b9d8 | 872 | BUG_ON(!file && !bitmap->offset); |
32a7627c | 873 | |
44456d37 | 874 | #ifdef INJECT_FAULTS_3 |
32a7627c N |
875 | outofdate = 1; |
876 | #else | |
877 | outofdate = bitmap->flags & BITMAP_STALE; | |
878 | #endif | |
879 | if (outofdate) | |
880 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
881 | "recovery\n", bmname(bitmap)); | |
882 | ||
883 | bytes = (chunks + 7) / 8; | |
bc7f77de | 884 | |
cdbb4cc2 | 885 | num_pages = (bytes + sizeof(bitmap_super_t) + PAGE_SIZE - 1) / PAGE_SIZE; |
bc7f77de | 886 | |
a654b9d8 | 887 | if (file && i_size_read(file->f_mapping->host) < bytes + sizeof(bitmap_super_t)) { |
32a7627c N |
888 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
889 | bmname(bitmap), | |
890 | (unsigned long) i_size_read(file->f_mapping->host), | |
891 | bytes + sizeof(bitmap_super_t)); | |
4ad13663 | 892 | goto err; |
32a7627c | 893 | } |
bc7f77de N |
894 | |
895 | ret = -ENOMEM; | |
896 | ||
32a7627c | 897 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
bc7f77de | 898 | if (!bitmap->filemap) |
4ad13663 | 899 | goto err; |
32a7627c | 900 | |
e16b68b6 N |
901 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
902 | bitmap->filemap_attr = kzalloc( | |
505fa2c4 | 903 | roundup( DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
e16b68b6 | 904 | GFP_KERNEL); |
bc7f77de | 905 | if (!bitmap->filemap_attr) |
4ad13663 | 906 | goto err; |
32a7627c | 907 | |
32a7627c N |
908 | oldindex = ~0L; |
909 | ||
910 | for (i = 0; i < chunks; i++) { | |
bd926c63 | 911 | int b; |
32a7627c N |
912 | index = file_page_index(i); |
913 | bit = file_page_offset(i); | |
914 | if (index != oldindex) { /* this is a new page, read it in */ | |
d785a06a | 915 | int count; |
32a7627c | 916 | /* unmap the old page, we're done with it */ |
d785a06a | 917 | if (index == num_pages-1) |
f49d5e62 N |
918 | count = bytes + sizeof(bitmap_super_t) |
919 | - index * PAGE_SIZE; | |
d785a06a N |
920 | else |
921 | count = PAGE_SIZE; | |
32a7627c N |
922 | if (index == 0) { |
923 | /* | |
924 | * if we're here then the superblock page | |
925 | * contains some bits (PAGE_SIZE != sizeof sb) | |
926 | * we've already read it in, so just use it | |
927 | */ | |
928 | page = bitmap->sb_page; | |
929 | offset = sizeof(bitmap_super_t); | |
a654b9d8 | 930 | } else if (file) { |
d785a06a | 931 | page = read_page(file, index, bitmap, count); |
a654b9d8 N |
932 | offset = 0; |
933 | } else { | |
934 | page = read_sb_page(bitmap->mddev, bitmap->offset, index); | |
32a7627c N |
935 | offset = 0; |
936 | } | |
a654b9d8 N |
937 | if (IS_ERR(page)) { /* read error */ |
938 | ret = PTR_ERR(page); | |
4ad13663 | 939 | goto err; |
a654b9d8 N |
940 | } |
941 | ||
32a7627c N |
942 | oldindex = index; |
943 | oldpage = page; | |
32a7627c N |
944 | |
945 | if (outofdate) { | |
946 | /* | |
947 | * if bitmap is out of date, dirty the | |
948 | * whole page and write it out | |
949 | */ | |
ea03aff9 N |
950 | paddr = kmap_atomic(page, KM_USER0); |
951 | memset(paddr + offset, 0xff, | |
6a07997f | 952 | PAGE_SIZE - offset); |
ea03aff9 | 953 | kunmap_atomic(paddr, KM_USER0); |
4ad13663 N |
954 | write_page(bitmap, page, 1); |
955 | ||
956 | ret = -EIO; | |
957 | if (bitmap->flags & BITMAP_WRITE_ERROR) { | |
32a7627c | 958 | /* release, page not in filemap yet */ |
2d1f3b5d | 959 | put_page(page); |
4ad13663 | 960 | goto err; |
32a7627c N |
961 | } |
962 | } | |
963 | ||
964 | bitmap->filemap[bitmap->file_pages++] = page; | |
ab6085c7 | 965 | bitmap->last_page_size = count; |
32a7627c | 966 | } |
ea03aff9 | 967 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 968 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 969 | b = test_bit(bit, paddr); |
bd926c63 | 970 | else |
ea03aff9 N |
971 | b = ext2_test_bit(bit, paddr); |
972 | kunmap_atomic(paddr, KM_USER0); | |
bd926c63 | 973 | if (b) { |
32a7627c | 974 | /* if the disk bit is set, set the memory bit */ |
6a07997f N |
975 | bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap), |
976 | ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start) | |
977 | ); | |
32a7627c | 978 | bit_cnt++; |
6a07997f | 979 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
32a7627c | 980 | } |
32a7627c N |
981 | } |
982 | ||
983 | /* everything went OK */ | |
984 | ret = 0; | |
985 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); | |
986 | ||
32a7627c N |
987 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
988 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
989 | md_wakeup_thread(bitmap->mddev->thread); | |
990 | } | |
991 | ||
32a7627c | 992 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
4ad13663 N |
993 | "read %lu/%lu pages, set %lu bits\n", |
994 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt); | |
995 | ||
996 | return 0; | |
32a7627c | 997 | |
4ad13663 N |
998 | err: |
999 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", | |
1000 | bmname(bitmap), ret); | |
32a7627c N |
1001 | return ret; |
1002 | } | |
1003 | ||
a654b9d8 N |
1004 | void bitmap_write_all(struct bitmap *bitmap) |
1005 | { | |
1006 | /* We don't actually write all bitmap blocks here, | |
1007 | * just flag them as needing to be written | |
1008 | */ | |
ec7a3197 | 1009 | int i; |
a654b9d8 | 1010 | |
ec7a3197 N |
1011 | for (i=0; i < bitmap->file_pages; i++) |
1012 | set_page_attr(bitmap, bitmap->filemap[i], | |
1013 | BITMAP_PAGE_NEEDWRITE); | |
a654b9d8 N |
1014 | } |
1015 | ||
32a7627c N |
1016 | |
1017 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) | |
1018 | { | |
1019 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1020 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1021 | bitmap->bp[page].count += inc; | |
1022 | /* | |
1023 | if (page == 0) printk("count page 0, offset %llu: %d gives %d\n", | |
1024 | (unsigned long long)offset, inc, bitmap->bp[page].count); | |
1025 | */ | |
1026 | bitmap_checkfree(bitmap, page); | |
1027 | } | |
1028 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, | |
1029 | sector_t offset, int *blocks, | |
1030 | int create); | |
1031 | ||
1032 | /* | |
1033 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1034 | * out to disk | |
1035 | */ | |
1036 | ||
4ad13663 | 1037 | void bitmap_daemon_work(struct bitmap *bitmap) |
32a7627c | 1038 | { |
aa3163f8 | 1039 | unsigned long j; |
32a7627c N |
1040 | unsigned long flags; |
1041 | struct page *page = NULL, *lastpage = NULL; | |
32a7627c | 1042 | int blocks; |
ea03aff9 | 1043 | void *paddr; |
32a7627c N |
1044 | |
1045 | if (bitmap == NULL) | |
4ad13663 | 1046 | return; |
32a7627c | 1047 | if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ)) |
7be3dfec N |
1048 | goto done; |
1049 | ||
32a7627c | 1050 | bitmap->daemon_lastrun = jiffies; |
8311c29d N |
1051 | if (bitmap->allclean) { |
1052 | bitmap->mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
1053 | return; | |
1054 | } | |
1055 | bitmap->allclean = 1; | |
32a7627c N |
1056 | |
1057 | for (j = 0; j < bitmap->chunks; j++) { | |
1058 | bitmap_counter_t *bmc; | |
1059 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 1060 | if (!bitmap->filemap) { |
32a7627c N |
1061 | /* error or shutdown */ |
1062 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1063 | break; | |
1064 | } | |
1065 | ||
1066 | page = filemap_get_page(bitmap, j); | |
32a7627c N |
1067 | |
1068 | if (page != lastpage) { | |
aa3163f8 | 1069 | /* skip this page unless it's marked as needing cleaning */ |
ec7a3197 N |
1070 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) { |
1071 | int need_write = test_page_attr(bitmap, page, | |
1072 | BITMAP_PAGE_NEEDWRITE); | |
a647e4bc | 1073 | if (need_write) |
aa3163f8 | 1074 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
a647e4bc | 1075 | |
aa3163f8 | 1076 | spin_unlock_irqrestore(&bitmap->lock, flags); |
8311c29d | 1077 | if (need_write) { |
4ad13663 | 1078 | write_page(bitmap, page, 0); |
8311c29d N |
1079 | bitmap->allclean = 0; |
1080 | } | |
aa3163f8 N |
1081 | continue; |
1082 | } | |
1083 | ||
32a7627c | 1084 | /* grab the new page, sync and release the old */ |
32a7627c | 1085 | if (lastpage != NULL) { |
ec7a3197 | 1086 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1087 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1088 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 1089 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1090 | } else { |
1091 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1092 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1093 | } | |
32a7627c N |
1094 | } else |
1095 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1096 | lastpage = page; | |
32a7627c N |
1097 | /* |
1098 | printk("bitmap clean at page %lu\n", j); | |
1099 | */ | |
1100 | spin_lock_irqsave(&bitmap->lock, flags); | |
1101 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1102 | } | |
1103 | bmc = bitmap_get_counter(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), | |
1104 | &blocks, 0); | |
1105 | if (bmc) { | |
1106 | /* | |
1107 | if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc); | |
1108 | */ | |
8311c29d N |
1109 | if (*bmc) |
1110 | bitmap->allclean = 0; | |
1111 | ||
32a7627c N |
1112 | if (*bmc == 2) { |
1113 | *bmc=1; /* maybe clear the bit next time */ | |
1114 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1115 | } else if (*bmc == 1) { | |
1116 | /* we can clear the bit */ | |
1117 | *bmc = 0; | |
1118 | bitmap_count_page(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), | |
1119 | -1); | |
1120 | ||
1121 | /* clear the bit */ | |
ea03aff9 | 1122 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1123 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 1124 | clear_bit(file_page_offset(j), paddr); |
bd926c63 | 1125 | else |
ea03aff9 N |
1126 | ext2_clear_bit(file_page_offset(j), paddr); |
1127 | kunmap_atomic(paddr, KM_USER0); | |
32a7627c N |
1128 | } |
1129 | } | |
1130 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1131 | } | |
1132 | ||
1133 | /* now sync the final page */ | |
1134 | if (lastpage != NULL) { | |
32a7627c | 1135 | spin_lock_irqsave(&bitmap->lock, flags); |
ec7a3197 | 1136 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1137 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1138 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 1139 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1140 | } else { |
1141 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1142 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1143 | } | |
32a7627c N |
1144 | } |
1145 | ||
7be3dfec | 1146 | done: |
8311c29d N |
1147 | if (bitmap->allclean == 0) |
1148 | bitmap->mddev->thread->timeout = bitmap->daemon_sleep * HZ; | |
32a7627c N |
1149 | } |
1150 | ||
32a7627c N |
1151 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
1152 | sector_t offset, int *blocks, | |
1153 | int create) | |
1154 | { | |
1155 | /* If 'create', we might release the lock and reclaim it. | |
1156 | * The lock must have been taken with interrupts enabled. | |
1157 | * If !create, we don't release the lock. | |
1158 | */ | |
1159 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1160 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1161 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1162 | sector_t csize; | |
1163 | ||
1164 | if (bitmap_checkpage(bitmap, page, create) < 0) { | |
1165 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
1166 | *blocks = csize - (offset & (csize- 1)); | |
1167 | return NULL; | |
1168 | } | |
1169 | /* now locked ... */ | |
1170 | ||
1171 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1172 | /* should we use the first or second counter field | |
1173 | * of the hijacked pointer? */ | |
1174 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
1175 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + | |
1176 | PAGE_COUNTER_SHIFT - 1); | |
1177 | *blocks = csize - (offset & (csize- 1)); | |
1178 | return &((bitmap_counter_t *) | |
1179 | &bitmap->bp[page].map)[hi]; | |
1180 | } else { /* page is allocated */ | |
1181 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
1182 | *blocks = csize - (offset & (csize- 1)); | |
1183 | return (bitmap_counter_t *) | |
1184 | &(bitmap->bp[page].map[pageoff]); | |
1185 | } | |
1186 | } | |
1187 | ||
4b6d287f | 1188 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c N |
1189 | { |
1190 | if (!bitmap) return 0; | |
4b6d287f N |
1191 | |
1192 | if (behind) { | |
1193 | atomic_inc(&bitmap->behind_writes); | |
1194 | PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", | |
1195 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1196 | } | |
1197 | ||
32a7627c N |
1198 | while (sectors) { |
1199 | int blocks; | |
1200 | bitmap_counter_t *bmc; | |
1201 | ||
1202 | spin_lock_irq(&bitmap->lock); | |
1203 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); | |
1204 | if (!bmc) { | |
1205 | spin_unlock_irq(&bitmap->lock); | |
1206 | return 0; | |
1207 | } | |
1208 | ||
da6e1a32 NB |
1209 | if (unlikely((*bmc & COUNTER_MAX) == COUNTER_MAX)) { |
1210 | DEFINE_WAIT(__wait); | |
1211 | /* note that it is safe to do the prepare_to_wait | |
1212 | * after the test as long as we do it before dropping | |
1213 | * the spinlock. | |
1214 | */ | |
1215 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1216 | TASK_UNINTERRUPTIBLE); | |
1217 | spin_unlock_irq(&bitmap->lock); | |
2ad8b1ef | 1218 | blk_unplug(bitmap->mddev->queue); |
da6e1a32 NB |
1219 | schedule(); |
1220 | finish_wait(&bitmap->overflow_wait, &__wait); | |
1221 | continue; | |
1222 | } | |
1223 | ||
32a7627c N |
1224 | switch(*bmc) { |
1225 | case 0: | |
1226 | bitmap_file_set_bit(bitmap, offset); | |
1227 | bitmap_count_page(bitmap,offset, 1); | |
1228 | blk_plug_device(bitmap->mddev->queue); | |
1229 | /* fall through */ | |
1230 | case 1: | |
1231 | *bmc = 2; | |
1232 | } | |
da6e1a32 | 1233 | |
32a7627c N |
1234 | (*bmc)++; |
1235 | ||
1236 | spin_unlock_irq(&bitmap->lock); | |
1237 | ||
1238 | offset += blocks; | |
1239 | if (sectors > blocks) | |
1240 | sectors -= blocks; | |
1241 | else sectors = 0; | |
1242 | } | |
8311c29d | 1243 | bitmap->allclean = 0; |
32a7627c N |
1244 | return 0; |
1245 | } | |
1246 | ||
1247 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1248 | int success, int behind) |
32a7627c N |
1249 | { |
1250 | if (!bitmap) return; | |
4b6d287f N |
1251 | if (behind) { |
1252 | atomic_dec(&bitmap->behind_writes); | |
1253 | PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", | |
1254 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1255 | } | |
1256 | ||
32a7627c N |
1257 | while (sectors) { |
1258 | int blocks; | |
1259 | unsigned long flags; | |
1260 | bitmap_counter_t *bmc; | |
1261 | ||
1262 | spin_lock_irqsave(&bitmap->lock, flags); | |
1263 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); | |
1264 | if (!bmc) { | |
1265 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1266 | return; | |
1267 | } | |
1268 | ||
1269 | if (!success && ! (*bmc & NEEDED_MASK)) | |
1270 | *bmc |= NEEDED_MASK; | |
1271 | ||
da6e1a32 NB |
1272 | if ((*bmc & COUNTER_MAX) == COUNTER_MAX) |
1273 | wake_up(&bitmap->overflow_wait); | |
1274 | ||
32a7627c N |
1275 | (*bmc)--; |
1276 | if (*bmc <= 2) { | |
1277 | set_page_attr(bitmap, | |
1278 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1279 | BITMAP_PAGE_CLEAN); | |
1280 | } | |
1281 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1282 | offset += blocks; | |
1283 | if (sectors > blocks) | |
1284 | sectors -= blocks; | |
1285 | else sectors = 0; | |
1286 | } | |
1287 | } | |
1288 | ||
6a806c51 N |
1289 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, |
1290 | int degraded) | |
32a7627c N |
1291 | { |
1292 | bitmap_counter_t *bmc; | |
1293 | int rv; | |
1294 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1295 | *blocks = 1024; | |
1296 | return 1; /* always resync if no bitmap */ | |
1297 | } | |
1298 | spin_lock_irq(&bitmap->lock); | |
1299 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1300 | rv = 0; | |
1301 | if (bmc) { | |
1302 | /* locked */ | |
1303 | if (RESYNC(*bmc)) | |
1304 | rv = 1; | |
1305 | else if (NEEDED(*bmc)) { | |
1306 | rv = 1; | |
6a806c51 N |
1307 | if (!degraded) { /* don't set/clear bits if degraded */ |
1308 | *bmc |= RESYNC_MASK; | |
1309 | *bmc &= ~NEEDED_MASK; | |
1310 | } | |
32a7627c N |
1311 | } |
1312 | } | |
1313 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1314 | bitmap->allclean = 0; |
32a7627c N |
1315 | return rv; |
1316 | } | |
1317 | ||
1318 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted) | |
1319 | { | |
1320 | bitmap_counter_t *bmc; | |
1321 | unsigned long flags; | |
1322 | /* | |
1323 | if (offset == 0) printk("bitmap_end_sync 0 (%d)\n", aborted); | |
1324 | */ if (bitmap == NULL) { | |
1325 | *blocks = 1024; | |
1326 | return; | |
1327 | } | |
1328 | spin_lock_irqsave(&bitmap->lock, flags); | |
1329 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1330 | if (bmc == NULL) | |
1331 | goto unlock; | |
1332 | /* locked */ | |
1333 | /* | |
1334 | if (offset == 0) printk("bitmap_end sync found 0x%x, blocks %d\n", *bmc, *blocks); | |
1335 | */ | |
1336 | if (RESYNC(*bmc)) { | |
1337 | *bmc &= ~RESYNC_MASK; | |
1338 | ||
1339 | if (!NEEDED(*bmc) && aborted) | |
1340 | *bmc |= NEEDED_MASK; | |
1341 | else { | |
1342 | if (*bmc <= 2) { | |
1343 | set_page_attr(bitmap, | |
1344 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1345 | BITMAP_PAGE_CLEAN); | |
1346 | } | |
1347 | } | |
1348 | } | |
1349 | unlock: | |
1350 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
8311c29d | 1351 | bitmap->allclean = 0; |
32a7627c N |
1352 | } |
1353 | ||
1354 | void bitmap_close_sync(struct bitmap *bitmap) | |
1355 | { | |
1356 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1357 | * properly have been aborted. It remains to us to clear the | |
1358 | * RESYNC bit wherever it is still on | |
1359 | */ | |
1360 | sector_t sector = 0; | |
1361 | int blocks; | |
b47490c9 N |
1362 | if (!bitmap) |
1363 | return; | |
32a7627c N |
1364 | while (sector < bitmap->mddev->resync_max_sectors) { |
1365 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
b47490c9 N |
1366 | sector += blocks; |
1367 | } | |
1368 | } | |
1369 | ||
1370 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) | |
1371 | { | |
1372 | sector_t s = 0; | |
1373 | int blocks; | |
1374 | ||
1375 | if (!bitmap) | |
1376 | return; | |
1377 | if (sector == 0) { | |
1378 | bitmap->last_end_sync = jiffies; | |
1379 | return; | |
1380 | } | |
1381 | if (time_before(jiffies, (bitmap->last_end_sync | |
1382 | + bitmap->daemon_sleep * HZ))) | |
1383 | return; | |
1384 | wait_event(bitmap->mddev->recovery_wait, | |
1385 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1386 | ||
1387 | sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1); | |
1388 | s = 0; | |
1389 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
1390 | bitmap_end_sync(bitmap, s, &blocks, 0); | |
1391 | s += blocks; | |
32a7627c | 1392 | } |
b47490c9 | 1393 | bitmap->last_end_sync = jiffies; |
32a7627c N |
1394 | } |
1395 | ||
6a07997f | 1396 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1397 | { |
1398 | /* For each chunk covered by any of these sectors, set the | |
193f1c93 | 1399 | * counter to 1 and set resync_needed. They should all |
32a7627c N |
1400 | * be 0 at this point |
1401 | */ | |
193f1c93 N |
1402 | |
1403 | int secs; | |
1404 | bitmap_counter_t *bmc; | |
1405 | spin_lock_irq(&bitmap->lock); | |
1406 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); | |
1407 | if (!bmc) { | |
32a7627c | 1408 | spin_unlock_irq(&bitmap->lock); |
193f1c93 | 1409 | return; |
32a7627c | 1410 | } |
193f1c93 N |
1411 | if (! *bmc) { |
1412 | struct page *page; | |
6a07997f | 1413 | *bmc = 1 | (needed?NEEDED_MASK:0); |
193f1c93 N |
1414 | bitmap_count_page(bitmap, offset, 1); |
1415 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); | |
1416 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1417 | } | |
1418 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1419 | bitmap->allclean = 0; |
32a7627c N |
1420 | } |
1421 | ||
9b1d1dac PC |
1422 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1423 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1424 | { | |
1425 | unsigned long chunk; | |
1426 | ||
1427 | for (chunk = s; chunk <= e; chunk++) { | |
1428 | sector_t sec = chunk << CHUNK_BLOCK_SHIFT(bitmap); | |
1429 | bitmap_set_memory_bits(bitmap, sec, 1); | |
1430 | bitmap_file_set_bit(bitmap, sec); | |
1431 | } | |
1432 | } | |
1433 | ||
6b8b3e8a N |
1434 | /* |
1435 | * flush out any pending updates | |
1436 | */ | |
1437 | void bitmap_flush(mddev_t *mddev) | |
1438 | { | |
1439 | struct bitmap *bitmap = mddev->bitmap; | |
1440 | int sleep; | |
1441 | ||
1442 | if (!bitmap) /* there was no bitmap */ | |
1443 | return; | |
1444 | ||
1445 | /* run the daemon_work three time to ensure everything is flushed | |
1446 | * that can be | |
1447 | */ | |
1448 | sleep = bitmap->daemon_sleep; | |
1449 | bitmap->daemon_sleep = 0; | |
1450 | bitmap_daemon_work(bitmap); | |
1451 | bitmap_daemon_work(bitmap); | |
1452 | bitmap_daemon_work(bitmap); | |
1453 | bitmap->daemon_sleep = sleep; | |
1454 | bitmap_update_sb(bitmap); | |
1455 | } | |
1456 | ||
32a7627c N |
1457 | /* |
1458 | * free memory that was allocated | |
1459 | */ | |
3178b0db | 1460 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1461 | { |
1462 | unsigned long k, pages; | |
1463 | struct bitmap_page *bp; | |
32a7627c N |
1464 | |
1465 | if (!bitmap) /* there was no bitmap */ | |
1466 | return; | |
1467 | ||
32a7627c N |
1468 | /* release the bitmap file and kill the daemon */ |
1469 | bitmap_file_put(bitmap); | |
1470 | ||
1471 | bp = bitmap->bp; | |
1472 | pages = bitmap->pages; | |
1473 | ||
1474 | /* free all allocated memory */ | |
1475 | ||
32a7627c N |
1476 | if (bp) /* deallocate the page memory */ |
1477 | for (k = 0; k < pages; k++) | |
1478 | if (bp[k].map && !bp[k].hijacked) | |
1479 | kfree(bp[k].map); | |
1480 | kfree(bp); | |
1481 | kfree(bitmap); | |
1482 | } | |
3178b0db N |
1483 | void bitmap_destroy(mddev_t *mddev) |
1484 | { | |
1485 | struct bitmap *bitmap = mddev->bitmap; | |
1486 | ||
1487 | if (!bitmap) /* there was no bitmap */ | |
1488 | return; | |
1489 | ||
1490 | mddev->bitmap = NULL; /* disconnect from the md device */ | |
b15c2e57 N |
1491 | if (mddev->thread) |
1492 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db N |
1493 | |
1494 | bitmap_free(bitmap); | |
1495 | } | |
32a7627c N |
1496 | |
1497 | /* | |
1498 | * initialize the bitmap structure | |
1499 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1500 | */ | |
1501 | int bitmap_create(mddev_t *mddev) | |
1502 | { | |
1503 | struct bitmap *bitmap; | |
1504 | unsigned long blocks = mddev->resync_max_sectors; | |
1505 | unsigned long chunks; | |
1506 | unsigned long pages; | |
1507 | struct file *file = mddev->bitmap_file; | |
1508 | int err; | |
6a07997f | 1509 | sector_t start; |
32a7627c | 1510 | |
5f6e3c83 | 1511 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1512 | |
a654b9d8 | 1513 | if (!file && !mddev->bitmap_offset) /* bitmap disabled, nothing to do */ |
32a7627c N |
1514 | return 0; |
1515 | ||
a654b9d8 N |
1516 | BUG_ON(file && mddev->bitmap_offset); |
1517 | ||
9ffae0cf | 1518 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c N |
1519 | if (!bitmap) |
1520 | return -ENOMEM; | |
1521 | ||
32a7627c | 1522 | spin_lock_init(&bitmap->lock); |
ce25c31b N |
1523 | atomic_set(&bitmap->pending_writes, 0); |
1524 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1525 | init_waitqueue_head(&bitmap->overflow_wait); |
ce25c31b | 1526 | |
32a7627c | 1527 | bitmap->mddev = mddev; |
32a7627c | 1528 | |
32a7627c | 1529 | bitmap->file = file; |
a654b9d8 | 1530 | bitmap->offset = mddev->bitmap_offset; |
ce25c31b N |
1531 | if (file) { |
1532 | get_file(file); | |
ef51c976 MF |
1533 | do_sync_mapping_range(file->f_mapping, 0, LLONG_MAX, |
1534 | SYNC_FILE_RANGE_WAIT_BEFORE | | |
1535 | SYNC_FILE_RANGE_WRITE | | |
1536 | SYNC_FILE_RANGE_WAIT_AFTER); | |
ce25c31b | 1537 | } |
32a7627c N |
1538 | /* read superblock from bitmap file (this sets bitmap->chunksize) */ |
1539 | err = bitmap_read_sb(bitmap); | |
1540 | if (err) | |
3178b0db | 1541 | goto error; |
32a7627c | 1542 | |
a638b2dc | 1543 | bitmap->chunkshift = ffz(~bitmap->chunksize); |
32a7627c N |
1544 | |
1545 | /* now that chunksize and chunkshift are set, we can use these macros */ | |
1546 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) / | |
1547 | CHUNK_BLOCK_RATIO(bitmap); | |
1548 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; | |
1549 | ||
1550 | BUG_ON(!pages); | |
1551 | ||
1552 | bitmap->chunks = chunks; | |
1553 | bitmap->pages = pages; | |
1554 | bitmap->missing_pages = pages; | |
1555 | bitmap->counter_bits = COUNTER_BITS; | |
1556 | ||
1557 | bitmap->syncchunk = ~0UL; | |
1558 | ||
44456d37 | 1559 | #ifdef INJECT_FATAL_FAULT_1 |
32a7627c N |
1560 | bitmap->bp = NULL; |
1561 | #else | |
9ffae0cf | 1562 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
32a7627c | 1563 | #endif |
3178b0db | 1564 | err = -ENOMEM; |
32a7627c | 1565 | if (!bitmap->bp) |
3178b0db | 1566 | goto error; |
32a7627c | 1567 | |
32a7627c N |
1568 | /* now that we have some pages available, initialize the in-memory |
1569 | * bitmap from the on-disk bitmap */ | |
6a07997f N |
1570 | start = 0; |
1571 | if (mddev->degraded == 0 | |
1572 | || bitmap->events_cleared == mddev->events) | |
1573 | /* no need to keep dirty bits to optimise a re-add of a missing device */ | |
1574 | start = mddev->recovery_cp; | |
1575 | err = bitmap_init_from_disk(bitmap, start); | |
193f1c93 | 1576 | |
32a7627c | 1577 | if (err) |
3178b0db | 1578 | goto error; |
32a7627c N |
1579 | |
1580 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", | |
1581 | pages, bmname(bitmap)); | |
1582 | ||
3178b0db N |
1583 | mddev->bitmap = bitmap; |
1584 | ||
b15c2e57 N |
1585 | mddev->thread->timeout = bitmap->daemon_sleep * HZ; |
1586 | ||
4ad13663 N |
1587 | bitmap_update_sb(bitmap); |
1588 | ||
1589 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; | |
3178b0db N |
1590 | |
1591 | error: | |
1592 | bitmap_free(bitmap); | |
1593 | return err; | |
32a7627c N |
1594 | } |
1595 | ||
1596 | /* the bitmap API -- for raid personalities */ | |
1597 | EXPORT_SYMBOL(bitmap_startwrite); | |
1598 | EXPORT_SYMBOL(bitmap_endwrite); | |
1599 | EXPORT_SYMBOL(bitmap_start_sync); | |
1600 | EXPORT_SYMBOL(bitmap_end_sync); | |
1601 | EXPORT_SYMBOL(bitmap_unplug); | |
1602 | EXPORT_SYMBOL(bitmap_close_sync); | |
b47490c9 | 1603 | EXPORT_SYMBOL(bitmap_cond_end_sync); |