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Commit | Line | Data |
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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 | { | |
209 | struct dentry *d; | |
210 | struct vfsmount *v; | |
211 | ||
212 | if (!buf) | |
213 | return NULL; | |
214 | ||
c649bb9c JS |
215 | d = file->f_path.dentry; |
216 | v = file->f_path.mnt; | |
32a7627c N |
217 | |
218 | buf = d_path(d, v, buf, count); | |
219 | ||
220 | return IS_ERR(buf) ? NULL : buf; | |
221 | } | |
222 | ||
223 | /* | |
224 | * basic page I/O operations | |
225 | */ | |
226 | ||
a654b9d8 N |
227 | /* IO operations when bitmap is stored near all superblocks */ |
228 | static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long index) | |
229 | { | |
230 | /* choose a good rdev and read the page from there */ | |
231 | ||
232 | mdk_rdev_t *rdev; | |
233 | struct list_head *tmp; | |
234 | struct page *page = alloc_page(GFP_KERNEL); | |
235 | sector_t target; | |
236 | ||
237 | if (!page) | |
238 | return ERR_PTR(-ENOMEM); | |
a654b9d8 | 239 | |
ab904d63 | 240 | ITERATE_RDEV(mddev, rdev, tmp) { |
b2d444d7 N |
241 | if (! test_bit(In_sync, &rdev->flags) |
242 | || test_bit(Faulty, &rdev->flags)) | |
ab904d63 N |
243 | continue; |
244 | ||
a654b9d8 N |
245 | target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512); |
246 | ||
ab904d63 N |
247 | if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) { |
248 | page->index = index; | |
ce25c31b N |
249 | attach_page_buffers(page, NULL); /* so that free_buffer will |
250 | * quietly no-op */ | |
ab904d63 N |
251 | return page; |
252 | } | |
253 | } | |
254 | return ERR_PTR(-EIO); | |
a654b9d8 | 255 | |
a654b9d8 N |
256 | } |
257 | ||
258 | static int write_sb_page(mddev_t *mddev, long offset, struct page *page, int wait) | |
259 | { | |
260 | mdk_rdev_t *rdev; | |
261 | struct list_head *tmp; | |
262 | ||
263 | ITERATE_RDEV(mddev, rdev, tmp) | |
b2d444d7 N |
264 | if (test_bit(In_sync, &rdev->flags) |
265 | && !test_bit(Faulty, &rdev->flags)) | |
a654b9d8 N |
266 | md_super_write(mddev, rdev, |
267 | (rdev->sb_offset<<1) + offset | |
268 | + page->index * (PAGE_SIZE/512), | |
269 | PAGE_SIZE, | |
270 | page); | |
271 | ||
272 | if (wait) | |
a9701a30 | 273 | md_super_wait(mddev); |
a654b9d8 N |
274 | return 0; |
275 | } | |
276 | ||
32a7627c | 277 | /* |
a654b9d8 | 278 | * write out a page to a file |
32a7627c | 279 | */ |
77ad4bc7 | 280 | static int write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 281 | { |
d785a06a | 282 | struct buffer_head *bh; |
32a7627c | 283 | |
a654b9d8 N |
284 | if (bitmap->file == NULL) |
285 | return write_sb_page(bitmap->mddev, bitmap->offset, page, wait); | |
286 | ||
d785a06a | 287 | bh = page_buffers(page); |
c708443c | 288 | |
d785a06a N |
289 | while (bh && bh->b_blocknr) { |
290 | atomic_inc(&bitmap->pending_writes); | |
291 | set_buffer_locked(bh); | |
292 | set_buffer_mapped(bh); | |
293 | submit_bh(WRITE, bh); | |
294 | bh = bh->b_this_page; | |
295 | } | |
296 | ||
297 | if (wait) { | |
298 | wait_event(bitmap->write_wait, | |
299 | atomic_read(&bitmap->pending_writes)==0); | |
300 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; | |
8a5e9cf1 | 301 | } |
d785a06a N |
302 | return 0; |
303 | } | |
304 | ||
305 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
306 | { | |
307 | struct bitmap *bitmap = bh->b_private; | |
308 | unsigned long flags; | |
32a7627c | 309 | |
d785a06a N |
310 | if (!uptodate) { |
311 | spin_lock_irqsave(&bitmap->lock, flags); | |
312 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
313 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
32a7627c | 314 | } |
d785a06a N |
315 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
316 | wake_up(&bitmap->write_wait); | |
317 | } | |
32a7627c | 318 | |
d785a06a N |
319 | /* copied from buffer.c */ |
320 | static void | |
321 | __clear_page_buffers(struct page *page) | |
322 | { | |
323 | ClearPagePrivate(page); | |
324 | set_page_private(page, 0); | |
325 | page_cache_release(page); | |
326 | } | |
327 | static void free_buffers(struct page *page) | |
328 | { | |
329 | struct buffer_head *bh = page_buffers(page); | |
77ad4bc7 | 330 | |
d785a06a N |
331 | while (bh) { |
332 | struct buffer_head *next = bh->b_this_page; | |
333 | free_buffer_head(bh); | |
334 | bh = next; | |
77ad4bc7 | 335 | } |
d785a06a N |
336 | __clear_page_buffers(page); |
337 | put_page(page); | |
32a7627c N |
338 | } |
339 | ||
d785a06a N |
340 | /* read a page from a file. |
341 | * We both read the page, and attach buffers to the page to record the | |
342 | * address of each block (using bmap). These addresses will be used | |
343 | * to write the block later, completely bypassing the filesystem. | |
344 | * This usage is similar to how swap files are handled, and allows us | |
345 | * to write to a file with no concerns of memory allocation failing. | |
346 | */ | |
32a7627c | 347 | static struct page *read_page(struct file *file, unsigned long index, |
d785a06a N |
348 | struct bitmap *bitmap, |
349 | unsigned long count) | |
32a7627c | 350 | { |
32a7627c | 351 | struct page *page = NULL; |
c649bb9c | 352 | struct inode *inode = file->f_path.dentry->d_inode; |
d785a06a N |
353 | struct buffer_head *bh; |
354 | sector_t block; | |
32a7627c | 355 | |
2d1f3b5d N |
356 | PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_SIZE, |
357 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 358 | |
d785a06a N |
359 | page = alloc_page(GFP_KERNEL); |
360 | if (!page) | |
361 | page = ERR_PTR(-ENOMEM); | |
32a7627c N |
362 | if (IS_ERR(page)) |
363 | goto out; | |
d785a06a | 364 | |
d785a06a N |
365 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
366 | if (!bh) { | |
2d1f3b5d | 367 | put_page(page); |
d785a06a | 368 | page = ERR_PTR(-ENOMEM); |
32a7627c N |
369 | goto out; |
370 | } | |
d785a06a N |
371 | attach_page_buffers(page, bh); |
372 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
373 | while (bh) { | |
374 | if (count == 0) | |
375 | bh->b_blocknr = 0; | |
376 | else { | |
377 | bh->b_blocknr = bmap(inode, block); | |
378 | if (bh->b_blocknr == 0) { | |
379 | /* Cannot use this file! */ | |
380 | free_buffers(page); | |
381 | page = ERR_PTR(-EINVAL); | |
382 | goto out; | |
383 | } | |
384 | bh->b_bdev = inode->i_sb->s_bdev; | |
385 | if (count < (1<<inode->i_blkbits)) | |
386 | count = 0; | |
387 | else | |
388 | count -= (1<<inode->i_blkbits); | |
389 | ||
390 | bh->b_end_io = end_bitmap_write; | |
391 | bh->b_private = bitmap; | |
ce25c31b N |
392 | atomic_inc(&bitmap->pending_writes); |
393 | set_buffer_locked(bh); | |
394 | set_buffer_mapped(bh); | |
395 | submit_bh(READ, bh); | |
d785a06a N |
396 | } |
397 | block++; | |
398 | bh = bh->b_this_page; | |
399 | } | |
d785a06a | 400 | page->index = index; |
ce25c31b N |
401 | |
402 | wait_event(bitmap->write_wait, | |
403 | atomic_read(&bitmap->pending_writes)==0); | |
404 | if (bitmap->flags & BITMAP_WRITE_ERROR) { | |
405 | free_buffers(page); | |
406 | page = ERR_PTR(-EIO); | |
407 | } | |
32a7627c N |
408 | out: |
409 | if (IS_ERR(page)) | |
410 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %Lu): %ld\n", | |
2d1f3b5d N |
411 | (int)PAGE_SIZE, |
412 | (unsigned long long)index << PAGE_SHIFT, | |
32a7627c N |
413 | PTR_ERR(page)); |
414 | return page; | |
415 | } | |
416 | ||
417 | /* | |
418 | * bitmap file superblock operations | |
419 | */ | |
420 | ||
421 | /* update the event counter and sync the superblock to disk */ | |
422 | int bitmap_update_sb(struct bitmap *bitmap) | |
423 | { | |
424 | bitmap_super_t *sb; | |
425 | unsigned long flags; | |
426 | ||
427 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
428 | return 0; | |
429 | spin_lock_irqsave(&bitmap->lock, flags); | |
430 | if (!bitmap->sb_page) { /* no superblock */ | |
431 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
432 | return 0; | |
433 | } | |
32a7627c | 434 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ea03aff9 | 435 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c N |
436 | sb->events = cpu_to_le64(bitmap->mddev->events); |
437 | if (!bitmap->mddev->degraded) | |
438 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
ea03aff9 | 439 | kunmap_atomic(sb, KM_USER0); |
8a5e9cf1 | 440 | return write_page(bitmap, bitmap->sb_page, 1); |
32a7627c N |
441 | } |
442 | ||
443 | /* print out the bitmap file superblock */ | |
444 | void bitmap_print_sb(struct bitmap *bitmap) | |
445 | { | |
446 | bitmap_super_t *sb; | |
447 | ||
448 | if (!bitmap || !bitmap->sb_page) | |
449 | return; | |
ea03aff9 | 450 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 451 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
452 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
453 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
454 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
455 | *(__u32 *)(sb->uuid+0), |
456 | *(__u32 *)(sb->uuid+4), | |
457 | *(__u32 *)(sb->uuid+8), | |
458 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 459 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 460 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 461 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 462 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
463 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
464 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
465 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
466 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
467 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 468 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
ea03aff9 | 469 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
470 | } |
471 | ||
472 | /* read the superblock from the bitmap file and initialize some bitmap fields */ | |
473 | static int bitmap_read_sb(struct bitmap *bitmap) | |
474 | { | |
475 | char *reason = NULL; | |
476 | bitmap_super_t *sb; | |
4b6d287f | 477 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c N |
478 | unsigned long long events; |
479 | int err = -EINVAL; | |
480 | ||
481 | /* page 0 is the superblock, read it... */ | |
a654b9d8 | 482 | if (bitmap->file) |
d785a06a | 483 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, PAGE_SIZE); |
a654b9d8 N |
484 | else { |
485 | bitmap->sb_page = read_sb_page(bitmap->mddev, bitmap->offset, 0); | |
a654b9d8 | 486 | } |
32a7627c N |
487 | if (IS_ERR(bitmap->sb_page)) { |
488 | err = PTR_ERR(bitmap->sb_page); | |
489 | bitmap->sb_page = NULL; | |
490 | return err; | |
491 | } | |
492 | ||
ea03aff9 | 493 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 494 | |
32a7627c N |
495 | chunksize = le32_to_cpu(sb->chunksize); |
496 | daemon_sleep = le32_to_cpu(sb->daemon_sleep); | |
4b6d287f | 497 | write_behind = le32_to_cpu(sb->write_behind); |
32a7627c N |
498 | |
499 | /* verify that the bitmap-specific fields are valid */ | |
500 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
501 | reason = "bad magic"; | |
bd926c63 N |
502 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
503 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) | |
32a7627c | 504 | reason = "unrecognized superblock version"; |
7dd5d34c N |
505 | else if (chunksize < PAGE_SIZE) |
506 | reason = "bitmap chunksize too small"; | |
32a7627c N |
507 | else if ((1 << ffz(~chunksize)) != chunksize) |
508 | reason = "bitmap chunksize not a power of 2"; | |
7dd5d34c N |
509 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT / HZ) |
510 | reason = "daemon sleep period out of range"; | |
4b6d287f N |
511 | else if (write_behind > COUNTER_MAX) |
512 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
513 | if (reason) { |
514 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
515 | bmname(bitmap), reason); | |
516 | goto out; | |
517 | } | |
518 | ||
519 | /* keep the array size field of the bitmap superblock up to date */ | |
520 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
521 | ||
522 | if (!bitmap->mddev->persistent) | |
523 | goto success; | |
524 | ||
525 | /* | |
526 | * if we have a persistent array superblock, compare the | |
527 | * bitmap's UUID and event counter to the mddev's | |
528 | */ | |
529 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
530 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", | |
531 | bmname(bitmap)); | |
532 | goto out; | |
533 | } | |
534 | events = le64_to_cpu(sb->events); | |
535 | if (events < bitmap->mddev->events) { | |
536 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " | |
537 | "-- forcing full recovery\n", bmname(bitmap), events, | |
538 | (unsigned long long) bitmap->mddev->events); | |
4f2e639a | 539 | sb->state |= cpu_to_le32(BITMAP_STALE); |
32a7627c N |
540 | } |
541 | success: | |
542 | /* assign fields using values from superblock */ | |
543 | bitmap->chunksize = chunksize; | |
544 | bitmap->daemon_sleep = daemon_sleep; | |
585f0dd5 | 545 | bitmap->daemon_lastrun = jiffies; |
4b6d287f | 546 | bitmap->max_write_behind = write_behind; |
4f2e639a | 547 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 N |
548 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
549 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
32a7627c | 550 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
4f2e639a | 551 | if (sb->state & cpu_to_le32(BITMAP_STALE)) |
6a07997f | 552 | bitmap->events_cleared = bitmap->mddev->events; |
32a7627c N |
553 | err = 0; |
554 | out: | |
ea03aff9 | 555 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
556 | if (err) |
557 | bitmap_print_sb(bitmap); | |
558 | return err; | |
559 | } | |
560 | ||
561 | enum bitmap_mask_op { | |
562 | MASK_SET, | |
563 | MASK_UNSET | |
564 | }; | |
565 | ||
566 | /* record the state of the bitmap in the superblock */ | |
567 | static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, | |
568 | enum bitmap_mask_op op) | |
569 | { | |
570 | bitmap_super_t *sb; | |
571 | unsigned long flags; | |
572 | ||
573 | spin_lock_irqsave(&bitmap->lock, flags); | |
7e317655 | 574 | if (!bitmap->sb_page) { /* can't set the state */ |
32a7627c N |
575 | spin_unlock_irqrestore(&bitmap->lock, flags); |
576 | return; | |
577 | } | |
32a7627c | 578 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ea03aff9 | 579 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 580 | switch (op) { |
4f2e639a | 581 | case MASK_SET: sb->state |= cpu_to_le32(bits); |
32a7627c | 582 | break; |
4f2e639a | 583 | case MASK_UNSET: sb->state &= cpu_to_le32(~bits); |
32a7627c N |
584 | break; |
585 | default: BUG(); | |
586 | } | |
ea03aff9 | 587 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
588 | } |
589 | ||
590 | /* | |
591 | * general bitmap file operations | |
592 | */ | |
593 | ||
594 | /* calculate the index of the page that contains this bit */ | |
595 | static inline unsigned long file_page_index(unsigned long chunk) | |
596 | { | |
597 | return CHUNK_BIT_OFFSET(chunk) >> PAGE_BIT_SHIFT; | |
598 | } | |
599 | ||
600 | /* calculate the (bit) offset of this bit within a page */ | |
601 | static inline unsigned long file_page_offset(unsigned long chunk) | |
602 | { | |
603 | return CHUNK_BIT_OFFSET(chunk) & (PAGE_BITS - 1); | |
604 | } | |
605 | ||
606 | /* | |
607 | * return a pointer to the page in the filemap that contains the given bit | |
608 | * | |
609 | * this lookup is complicated by the fact that the bitmap sb might be exactly | |
610 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page | |
611 | * 0 or page 1 | |
612 | */ | |
613 | static inline struct page *filemap_get_page(struct bitmap *bitmap, | |
614 | unsigned long chunk) | |
615 | { | |
9b1d1dac | 616 | if (file_page_index(chunk) >= bitmap->file_pages) return NULL; |
32a7627c N |
617 | return bitmap->filemap[file_page_index(chunk) - file_page_index(0)]; |
618 | } | |
619 | ||
620 | ||
621 | static void bitmap_file_unmap(struct bitmap *bitmap) | |
622 | { | |
623 | struct page **map, *sb_page; | |
624 | unsigned long *attr; | |
625 | int pages; | |
626 | unsigned long flags; | |
627 | ||
628 | spin_lock_irqsave(&bitmap->lock, flags); | |
629 | map = bitmap->filemap; | |
630 | bitmap->filemap = NULL; | |
631 | attr = bitmap->filemap_attr; | |
632 | bitmap->filemap_attr = NULL; | |
633 | pages = bitmap->file_pages; | |
634 | bitmap->file_pages = 0; | |
635 | sb_page = bitmap->sb_page; | |
636 | bitmap->sb_page = NULL; | |
637 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
638 | ||
639 | while (pages--) | |
640 | if (map[pages]->index != 0) /* 0 is sb_page, release it below */ | |
d785a06a | 641 | free_buffers(map[pages]); |
32a7627c N |
642 | kfree(map); |
643 | kfree(attr); | |
644 | ||
d785a06a N |
645 | if (sb_page) |
646 | free_buffers(sb_page); | |
32a7627c N |
647 | } |
648 | ||
649 | static void bitmap_file_put(struct bitmap *bitmap) | |
650 | { | |
651 | struct file *file; | |
32a7627c N |
652 | unsigned long flags; |
653 | ||
654 | spin_lock_irqsave(&bitmap->lock, flags); | |
655 | file = bitmap->file; | |
656 | bitmap->file = NULL; | |
657 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
658 | ||
d785a06a N |
659 | if (file) |
660 | wait_event(bitmap->write_wait, | |
661 | atomic_read(&bitmap->pending_writes)==0); | |
32a7627c N |
662 | bitmap_file_unmap(bitmap); |
663 | ||
d785a06a | 664 | if (file) { |
c649bb9c | 665 | struct inode *inode = file->f_path.dentry->d_inode; |
d785a06a | 666 | invalidate_inode_pages(inode->i_mapping); |
32a7627c | 667 | fput(file); |
d785a06a | 668 | } |
32a7627c N |
669 | } |
670 | ||
671 | ||
672 | /* | |
673 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
674 | * then it is no longer reliable, so we stop using it and we mark the file | |
675 | * as failed in the superblock | |
676 | */ | |
677 | static void bitmap_file_kick(struct bitmap *bitmap) | |
678 | { | |
679 | char *path, *ptr = NULL; | |
680 | ||
681 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET); | |
682 | bitmap_update_sb(bitmap); | |
683 | ||
a654b9d8 N |
684 | if (bitmap->file) { |
685 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
686 | if (path) | |
687 | ptr = file_path(bitmap->file, path, PAGE_SIZE); | |
32a7627c | 688 | |
a654b9d8 N |
689 | printk(KERN_ALERT "%s: kicking failed bitmap file %s from array!\n", |
690 | bmname(bitmap), ptr ? ptr : ""); | |
32a7627c | 691 | |
a654b9d8 N |
692 | kfree(path); |
693 | } | |
32a7627c N |
694 | |
695 | bitmap_file_put(bitmap); | |
696 | ||
697 | return; | |
698 | } | |
699 | ||
700 | enum bitmap_page_attr { | |
e16b68b6 N |
701 | BITMAP_PAGE_DIRTY = 0, // there are set bits that need to be synced |
702 | BITMAP_PAGE_CLEAN = 1, // there are bits that might need to be cleared | |
703 | BITMAP_PAGE_NEEDWRITE=2, // there are cleared bits that need to be synced | |
32a7627c N |
704 | }; |
705 | ||
706 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, | |
707 | enum bitmap_page_attr attr) | |
708 | { | |
e16b68b6 | 709 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
710 | } |
711 | ||
712 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, | |
713 | enum bitmap_page_attr attr) | |
714 | { | |
e16b68b6 | 715 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
716 | } |
717 | ||
ec7a3197 N |
718 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
719 | enum bitmap_page_attr attr) | |
32a7627c | 720 | { |
e16b68b6 | 721 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
722 | } |
723 | ||
724 | /* | |
725 | * bitmap_file_set_bit -- called before performing a write to the md device | |
726 | * to set (and eventually sync) a particular bit in the bitmap file | |
727 | * | |
728 | * we set the bit immediately, then we record the page number so that | |
729 | * when an unplug occurs, we can flush the dirty pages out to disk | |
730 | */ | |
731 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
732 | { | |
733 | unsigned long bit; | |
734 | struct page *page; | |
735 | void *kaddr; | |
736 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); | |
737 | ||
a654b9d8 | 738 | if (!bitmap->filemap) { |
32a7627c N |
739 | return; |
740 | } | |
741 | ||
742 | page = filemap_get_page(bitmap, chunk); | |
9b1d1dac | 743 | if (!page) return; |
32a7627c N |
744 | bit = file_page_offset(chunk); |
745 | ||
32a7627c N |
746 | /* set the bit */ |
747 | kaddr = kmap_atomic(page, KM_USER0); | |
bd926c63 N |
748 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
749 | set_bit(bit, kaddr); | |
750 | else | |
751 | ext2_set_bit(bit, kaddr); | |
32a7627c N |
752 | kunmap_atomic(kaddr, KM_USER0); |
753 | PRINTK("set file bit %lu page %lu\n", bit, page->index); | |
754 | ||
755 | /* record page number so it gets flushed to disk when unplug occurs */ | |
756 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); | |
757 | ||
758 | } | |
759 | ||
760 | /* this gets called when the md device is ready to unplug its underlying | |
761 | * (slave) device queues -- before we let any writes go down, we need to | |
762 | * sync the dirty pages of the bitmap file to disk */ | |
763 | int bitmap_unplug(struct bitmap *bitmap) | |
764 | { | |
ec7a3197 N |
765 | unsigned long i, flags; |
766 | int dirty, need_write; | |
32a7627c N |
767 | struct page *page; |
768 | int wait = 0; | |
8a5e9cf1 | 769 | int err; |
32a7627c N |
770 | |
771 | if (!bitmap) | |
772 | return 0; | |
773 | ||
774 | /* look at each page to see if there are any set bits that need to be | |
775 | * flushed out to disk */ | |
776 | for (i = 0; i < bitmap->file_pages; i++) { | |
777 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 778 | if (!bitmap->filemap) { |
32a7627c N |
779 | spin_unlock_irqrestore(&bitmap->lock, flags); |
780 | return 0; | |
781 | } | |
782 | page = bitmap->filemap[i]; | |
ec7a3197 N |
783 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
784 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
32a7627c N |
785 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
786 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
ec7a3197 | 787 | if (dirty) |
32a7627c N |
788 | wait = 1; |
789 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
790 | ||
d785a06a | 791 | if (dirty | need_write) |
8a5e9cf1 | 792 | err = write_page(bitmap, page, 0); |
32a7627c N |
793 | } |
794 | if (wait) { /* if any writes were performed, we need to wait on them */ | |
0b79ccf0 | 795 | if (bitmap->file) |
d785a06a N |
796 | wait_event(bitmap->write_wait, |
797 | atomic_read(&bitmap->pending_writes)==0); | |
0b79ccf0 | 798 | else |
a9701a30 | 799 | md_super_wait(bitmap->mddev); |
32a7627c | 800 | } |
d785a06a N |
801 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
802 | bitmap_file_kick(bitmap); | |
32a7627c N |
803 | return 0; |
804 | } | |
805 | ||
6a07997f | 806 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
807 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
808 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
809 | * memory mapping of the bitmap file | |
810 | * Special cases: | |
811 | * if there's no bitmap file, or if the bitmap file had been | |
812 | * previously kicked from the array, we mark all the bits as | |
813 | * 1's in order to cause a full resync. | |
6a07997f N |
814 | * |
815 | * We ignore all bits for sectors that end earlier than 'start'. | |
816 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 817 | */ |
6a07997f | 818 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c N |
819 | { |
820 | unsigned long i, chunks, index, oldindex, bit; | |
821 | struct page *page = NULL, *oldpage = NULL; | |
822 | unsigned long num_pages, bit_cnt = 0; | |
823 | struct file *file; | |
d785a06a | 824 | unsigned long bytes, offset; |
32a7627c N |
825 | int outofdate; |
826 | int ret = -ENOSPC; | |
ea03aff9 | 827 | void *paddr; |
32a7627c N |
828 | |
829 | chunks = bitmap->chunks; | |
830 | file = bitmap->file; | |
831 | ||
a654b9d8 | 832 | BUG_ON(!file && !bitmap->offset); |
32a7627c | 833 | |
44456d37 | 834 | #ifdef INJECT_FAULTS_3 |
32a7627c N |
835 | outofdate = 1; |
836 | #else | |
837 | outofdate = bitmap->flags & BITMAP_STALE; | |
838 | #endif | |
839 | if (outofdate) | |
840 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
841 | "recovery\n", bmname(bitmap)); | |
842 | ||
843 | bytes = (chunks + 7) / 8; | |
bc7f77de | 844 | |
cdbb4cc2 | 845 | num_pages = (bytes + sizeof(bitmap_super_t) + PAGE_SIZE - 1) / PAGE_SIZE; |
bc7f77de | 846 | |
a654b9d8 | 847 | if (file && i_size_read(file->f_mapping->host) < bytes + sizeof(bitmap_super_t)) { |
32a7627c N |
848 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
849 | bmname(bitmap), | |
850 | (unsigned long) i_size_read(file->f_mapping->host), | |
851 | bytes + sizeof(bitmap_super_t)); | |
852 | goto out; | |
853 | } | |
bc7f77de N |
854 | |
855 | ret = -ENOMEM; | |
856 | ||
32a7627c | 857 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
bc7f77de | 858 | if (!bitmap->filemap) |
32a7627c | 859 | goto out; |
32a7627c | 860 | |
e16b68b6 N |
861 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
862 | bitmap->filemap_attr = kzalloc( | |
863 | (((num_pages*4/8)+sizeof(unsigned long)-1) | |
864 | /sizeof(unsigned long)) | |
865 | *sizeof(unsigned long), | |
866 | GFP_KERNEL); | |
bc7f77de | 867 | if (!bitmap->filemap_attr) |
32a7627c | 868 | goto out; |
32a7627c | 869 | |
32a7627c N |
870 | oldindex = ~0L; |
871 | ||
872 | for (i = 0; i < chunks; i++) { | |
bd926c63 | 873 | int b; |
32a7627c N |
874 | index = file_page_index(i); |
875 | bit = file_page_offset(i); | |
876 | if (index != oldindex) { /* this is a new page, read it in */ | |
d785a06a | 877 | int count; |
32a7627c | 878 | /* unmap the old page, we're done with it */ |
d785a06a N |
879 | if (index == num_pages-1) |
880 | count = bytes - index * PAGE_SIZE; | |
881 | else | |
882 | count = PAGE_SIZE; | |
32a7627c N |
883 | if (index == 0) { |
884 | /* | |
885 | * if we're here then the superblock page | |
886 | * contains some bits (PAGE_SIZE != sizeof sb) | |
887 | * we've already read it in, so just use it | |
888 | */ | |
889 | page = bitmap->sb_page; | |
890 | offset = sizeof(bitmap_super_t); | |
a654b9d8 | 891 | } else if (file) { |
d785a06a | 892 | page = read_page(file, index, bitmap, count); |
a654b9d8 N |
893 | offset = 0; |
894 | } else { | |
895 | page = read_sb_page(bitmap->mddev, bitmap->offset, index); | |
32a7627c N |
896 | offset = 0; |
897 | } | |
a654b9d8 N |
898 | if (IS_ERR(page)) { /* read error */ |
899 | ret = PTR_ERR(page); | |
900 | goto out; | |
901 | } | |
902 | ||
32a7627c N |
903 | oldindex = index; |
904 | oldpage = page; | |
32a7627c N |
905 | |
906 | if (outofdate) { | |
907 | /* | |
908 | * if bitmap is out of date, dirty the | |
909 | * whole page and write it out | |
910 | */ | |
ea03aff9 N |
911 | paddr = kmap_atomic(page, KM_USER0); |
912 | memset(paddr + offset, 0xff, | |
6a07997f | 913 | PAGE_SIZE - offset); |
ea03aff9 | 914 | kunmap_atomic(paddr, KM_USER0); |
77ad4bc7 | 915 | ret = write_page(bitmap, page, 1); |
32a7627c | 916 | if (ret) { |
32a7627c | 917 | /* release, page not in filemap yet */ |
2d1f3b5d | 918 | put_page(page); |
32a7627c N |
919 | goto out; |
920 | } | |
921 | } | |
922 | ||
923 | bitmap->filemap[bitmap->file_pages++] = page; | |
924 | } | |
ea03aff9 | 925 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 926 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 927 | b = test_bit(bit, paddr); |
bd926c63 | 928 | else |
ea03aff9 N |
929 | b = ext2_test_bit(bit, paddr); |
930 | kunmap_atomic(paddr, KM_USER0); | |
bd926c63 | 931 | if (b) { |
32a7627c | 932 | /* if the disk bit is set, set the memory bit */ |
6a07997f N |
933 | bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap), |
934 | ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start) | |
935 | ); | |
32a7627c | 936 | bit_cnt++; |
6a07997f | 937 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
32a7627c | 938 | } |
32a7627c N |
939 | } |
940 | ||
941 | /* everything went OK */ | |
942 | ret = 0; | |
943 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); | |
944 | ||
32a7627c N |
945 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
946 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
947 | md_wakeup_thread(bitmap->mddev->thread); | |
948 | } | |
949 | ||
950 | out: | |
951 | printk(KERN_INFO "%s: bitmap initialized from disk: " | |
952 | "read %lu/%lu pages, set %lu bits, status: %d\n", | |
953 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, ret); | |
954 | ||
955 | return ret; | |
956 | } | |
957 | ||
a654b9d8 N |
958 | void bitmap_write_all(struct bitmap *bitmap) |
959 | { | |
960 | /* We don't actually write all bitmap blocks here, | |
961 | * just flag them as needing to be written | |
962 | */ | |
ec7a3197 | 963 | int i; |
a654b9d8 | 964 | |
ec7a3197 N |
965 | for (i=0; i < bitmap->file_pages; i++) |
966 | set_page_attr(bitmap, bitmap->filemap[i], | |
967 | BITMAP_PAGE_NEEDWRITE); | |
a654b9d8 N |
968 | } |
969 | ||
32a7627c N |
970 | |
971 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) | |
972 | { | |
973 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
974 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
975 | bitmap->bp[page].count += inc; | |
976 | /* | |
977 | if (page == 0) printk("count page 0, offset %llu: %d gives %d\n", | |
978 | (unsigned long long)offset, inc, bitmap->bp[page].count); | |
979 | */ | |
980 | bitmap_checkfree(bitmap, page); | |
981 | } | |
982 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, | |
983 | sector_t offset, int *blocks, | |
984 | int create); | |
985 | ||
986 | /* | |
987 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
988 | * out to disk | |
989 | */ | |
990 | ||
991 | int bitmap_daemon_work(struct bitmap *bitmap) | |
992 | { | |
aa3163f8 | 993 | unsigned long j; |
32a7627c N |
994 | unsigned long flags; |
995 | struct page *page = NULL, *lastpage = NULL; | |
996 | int err = 0; | |
997 | int blocks; | |
ea03aff9 | 998 | void *paddr; |
32a7627c N |
999 | |
1000 | if (bitmap == NULL) | |
1001 | return 0; | |
1002 | if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ)) | |
1003 | return 0; | |
1004 | bitmap->daemon_lastrun = jiffies; | |
1005 | ||
1006 | for (j = 0; j < bitmap->chunks; j++) { | |
1007 | bitmap_counter_t *bmc; | |
1008 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 1009 | if (!bitmap->filemap) { |
32a7627c N |
1010 | /* error or shutdown */ |
1011 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1012 | break; | |
1013 | } | |
1014 | ||
1015 | page = filemap_get_page(bitmap, j); | |
32a7627c N |
1016 | |
1017 | if (page != lastpage) { | |
aa3163f8 | 1018 | /* skip this page unless it's marked as needing cleaning */ |
ec7a3197 N |
1019 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) { |
1020 | int need_write = test_page_attr(bitmap, page, | |
1021 | BITMAP_PAGE_NEEDWRITE); | |
a647e4bc | 1022 | if (need_write) |
aa3163f8 | 1023 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
a647e4bc | 1024 | |
aa3163f8 | 1025 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ec7a3197 | 1026 | if (need_write) { |
8a5e9cf1 | 1027 | switch (write_page(bitmap, page, 0)) { |
8a5e9cf1 N |
1028 | case 0: |
1029 | break; | |
1030 | default: | |
aa3163f8 | 1031 | bitmap_file_kick(bitmap); |
8a5e9cf1 | 1032 | } |
aa3163f8 N |
1033 | } |
1034 | continue; | |
1035 | } | |
1036 | ||
32a7627c | 1037 | /* grab the new page, sync and release the old */ |
32a7627c | 1038 | if (lastpage != NULL) { |
ec7a3197 | 1039 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1040 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1041 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
77ad4bc7 | 1042 | err = write_page(bitmap, lastpage, 0); |
32a7627c N |
1043 | } else { |
1044 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1045 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1046 | } | |
32a7627c N |
1047 | if (err) |
1048 | bitmap_file_kick(bitmap); | |
1049 | } else | |
1050 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1051 | lastpage = page; | |
32a7627c N |
1052 | /* |
1053 | printk("bitmap clean at page %lu\n", j); | |
1054 | */ | |
1055 | spin_lock_irqsave(&bitmap->lock, flags); | |
1056 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1057 | } | |
1058 | bmc = bitmap_get_counter(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), | |
1059 | &blocks, 0); | |
1060 | if (bmc) { | |
1061 | /* | |
1062 | if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc); | |
1063 | */ | |
1064 | if (*bmc == 2) { | |
1065 | *bmc=1; /* maybe clear the bit next time */ | |
1066 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1067 | } else if (*bmc == 1) { | |
1068 | /* we can clear the bit */ | |
1069 | *bmc = 0; | |
1070 | bitmap_count_page(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), | |
1071 | -1); | |
1072 | ||
1073 | /* clear the bit */ | |
ea03aff9 | 1074 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1075 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 1076 | clear_bit(file_page_offset(j), paddr); |
bd926c63 | 1077 | else |
ea03aff9 N |
1078 | ext2_clear_bit(file_page_offset(j), paddr); |
1079 | kunmap_atomic(paddr, KM_USER0); | |
32a7627c N |
1080 | } |
1081 | } | |
1082 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1083 | } | |
1084 | ||
1085 | /* now sync the final page */ | |
1086 | if (lastpage != NULL) { | |
32a7627c | 1087 | spin_lock_irqsave(&bitmap->lock, flags); |
ec7a3197 | 1088 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1089 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1090 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
77ad4bc7 | 1091 | err = write_page(bitmap, lastpage, 0); |
32a7627c N |
1092 | } else { |
1093 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1094 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1095 | } | |
32a7627c N |
1096 | } |
1097 | ||
1098 | return err; | |
1099 | } | |
1100 | ||
32a7627c N |
1101 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
1102 | sector_t offset, int *blocks, | |
1103 | int create) | |
1104 | { | |
1105 | /* If 'create', we might release the lock and reclaim it. | |
1106 | * The lock must have been taken with interrupts enabled. | |
1107 | * If !create, we don't release the lock. | |
1108 | */ | |
1109 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1110 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1111 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1112 | sector_t csize; | |
1113 | ||
1114 | if (bitmap_checkpage(bitmap, page, create) < 0) { | |
1115 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
1116 | *blocks = csize - (offset & (csize- 1)); | |
1117 | return NULL; | |
1118 | } | |
1119 | /* now locked ... */ | |
1120 | ||
1121 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1122 | /* should we use the first or second counter field | |
1123 | * of the hijacked pointer? */ | |
1124 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
1125 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + | |
1126 | PAGE_COUNTER_SHIFT - 1); | |
1127 | *blocks = csize - (offset & (csize- 1)); | |
1128 | return &((bitmap_counter_t *) | |
1129 | &bitmap->bp[page].map)[hi]; | |
1130 | } else { /* page is allocated */ | |
1131 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
1132 | *blocks = csize - (offset & (csize- 1)); | |
1133 | return (bitmap_counter_t *) | |
1134 | &(bitmap->bp[page].map[pageoff]); | |
1135 | } | |
1136 | } | |
1137 | ||
4b6d287f | 1138 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c N |
1139 | { |
1140 | if (!bitmap) return 0; | |
4b6d287f N |
1141 | |
1142 | if (behind) { | |
1143 | atomic_inc(&bitmap->behind_writes); | |
1144 | PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", | |
1145 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1146 | } | |
1147 | ||
32a7627c N |
1148 | while (sectors) { |
1149 | int blocks; | |
1150 | bitmap_counter_t *bmc; | |
1151 | ||
1152 | spin_lock_irq(&bitmap->lock); | |
1153 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); | |
1154 | if (!bmc) { | |
1155 | spin_unlock_irq(&bitmap->lock); | |
1156 | return 0; | |
1157 | } | |
1158 | ||
1159 | switch(*bmc) { | |
1160 | case 0: | |
1161 | bitmap_file_set_bit(bitmap, offset); | |
1162 | bitmap_count_page(bitmap,offset, 1); | |
1163 | blk_plug_device(bitmap->mddev->queue); | |
1164 | /* fall through */ | |
1165 | case 1: | |
1166 | *bmc = 2; | |
1167 | } | |
5daf2cf1 | 1168 | BUG_ON((*bmc & COUNTER_MAX) == COUNTER_MAX); |
32a7627c N |
1169 | (*bmc)++; |
1170 | ||
1171 | spin_unlock_irq(&bitmap->lock); | |
1172 | ||
1173 | offset += blocks; | |
1174 | if (sectors > blocks) | |
1175 | sectors -= blocks; | |
1176 | else sectors = 0; | |
1177 | } | |
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1182 | int success, int behind) |
32a7627c N |
1183 | { |
1184 | if (!bitmap) return; | |
4b6d287f N |
1185 | if (behind) { |
1186 | atomic_dec(&bitmap->behind_writes); | |
1187 | PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", | |
1188 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1189 | } | |
1190 | ||
32a7627c N |
1191 | while (sectors) { |
1192 | int blocks; | |
1193 | unsigned long flags; | |
1194 | bitmap_counter_t *bmc; | |
1195 | ||
1196 | spin_lock_irqsave(&bitmap->lock, flags); | |
1197 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); | |
1198 | if (!bmc) { | |
1199 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1200 | return; | |
1201 | } | |
1202 | ||
1203 | if (!success && ! (*bmc & NEEDED_MASK)) | |
1204 | *bmc |= NEEDED_MASK; | |
1205 | ||
1206 | (*bmc)--; | |
1207 | if (*bmc <= 2) { | |
1208 | set_page_attr(bitmap, | |
1209 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1210 | BITMAP_PAGE_CLEAN); | |
1211 | } | |
1212 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1213 | offset += blocks; | |
1214 | if (sectors > blocks) | |
1215 | sectors -= blocks; | |
1216 | else sectors = 0; | |
1217 | } | |
1218 | } | |
1219 | ||
6a806c51 N |
1220 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, |
1221 | int degraded) | |
32a7627c N |
1222 | { |
1223 | bitmap_counter_t *bmc; | |
1224 | int rv; | |
1225 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1226 | *blocks = 1024; | |
1227 | return 1; /* always resync if no bitmap */ | |
1228 | } | |
1229 | spin_lock_irq(&bitmap->lock); | |
1230 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1231 | rv = 0; | |
1232 | if (bmc) { | |
1233 | /* locked */ | |
1234 | if (RESYNC(*bmc)) | |
1235 | rv = 1; | |
1236 | else if (NEEDED(*bmc)) { | |
1237 | rv = 1; | |
6a806c51 N |
1238 | if (!degraded) { /* don't set/clear bits if degraded */ |
1239 | *bmc |= RESYNC_MASK; | |
1240 | *bmc &= ~NEEDED_MASK; | |
1241 | } | |
32a7627c N |
1242 | } |
1243 | } | |
1244 | spin_unlock_irq(&bitmap->lock); | |
1245 | return rv; | |
1246 | } | |
1247 | ||
1248 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted) | |
1249 | { | |
1250 | bitmap_counter_t *bmc; | |
1251 | unsigned long flags; | |
1252 | /* | |
1253 | if (offset == 0) printk("bitmap_end_sync 0 (%d)\n", aborted); | |
1254 | */ if (bitmap == NULL) { | |
1255 | *blocks = 1024; | |
1256 | return; | |
1257 | } | |
1258 | spin_lock_irqsave(&bitmap->lock, flags); | |
1259 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1260 | if (bmc == NULL) | |
1261 | goto unlock; | |
1262 | /* locked */ | |
1263 | /* | |
1264 | if (offset == 0) printk("bitmap_end sync found 0x%x, blocks %d\n", *bmc, *blocks); | |
1265 | */ | |
1266 | if (RESYNC(*bmc)) { | |
1267 | *bmc &= ~RESYNC_MASK; | |
1268 | ||
1269 | if (!NEEDED(*bmc) && aborted) | |
1270 | *bmc |= NEEDED_MASK; | |
1271 | else { | |
1272 | if (*bmc <= 2) { | |
1273 | set_page_attr(bitmap, | |
1274 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1275 | BITMAP_PAGE_CLEAN); | |
1276 | } | |
1277 | } | |
1278 | } | |
1279 | unlock: | |
1280 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1281 | } | |
1282 | ||
1283 | void bitmap_close_sync(struct bitmap *bitmap) | |
1284 | { | |
1285 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1286 | * properly have been aborted. It remains to us to clear the | |
1287 | * RESYNC bit wherever it is still on | |
1288 | */ | |
1289 | sector_t sector = 0; | |
1290 | int blocks; | |
1291 | if (!bitmap) return; | |
1292 | while (sector < bitmap->mddev->resync_max_sectors) { | |
1293 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
1294 | /* | |
1295 | if (sector < 500) printk("bitmap_close_sync: sec %llu blks %d\n", | |
1296 | (unsigned long long)sector, blocks); | |
1297 | */ sector += blocks; | |
1298 | } | |
1299 | } | |
1300 | ||
6a07997f | 1301 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1302 | { |
1303 | /* For each chunk covered by any of these sectors, set the | |
193f1c93 | 1304 | * counter to 1 and set resync_needed. They should all |
32a7627c N |
1305 | * be 0 at this point |
1306 | */ | |
193f1c93 N |
1307 | |
1308 | int secs; | |
1309 | bitmap_counter_t *bmc; | |
1310 | spin_lock_irq(&bitmap->lock); | |
1311 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); | |
1312 | if (!bmc) { | |
32a7627c | 1313 | spin_unlock_irq(&bitmap->lock); |
193f1c93 | 1314 | return; |
32a7627c | 1315 | } |
193f1c93 N |
1316 | if (! *bmc) { |
1317 | struct page *page; | |
6a07997f | 1318 | *bmc = 1 | (needed?NEEDED_MASK:0); |
193f1c93 N |
1319 | bitmap_count_page(bitmap, offset, 1); |
1320 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); | |
1321 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1322 | } | |
1323 | spin_unlock_irq(&bitmap->lock); | |
1324 | ||
32a7627c N |
1325 | } |
1326 | ||
9b1d1dac PC |
1327 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1328 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1329 | { | |
1330 | unsigned long chunk; | |
1331 | ||
1332 | for (chunk = s; chunk <= e; chunk++) { | |
1333 | sector_t sec = chunk << CHUNK_BLOCK_SHIFT(bitmap); | |
1334 | bitmap_set_memory_bits(bitmap, sec, 1); | |
1335 | bitmap_file_set_bit(bitmap, sec); | |
1336 | } | |
1337 | } | |
1338 | ||
6b8b3e8a N |
1339 | /* |
1340 | * flush out any pending updates | |
1341 | */ | |
1342 | void bitmap_flush(mddev_t *mddev) | |
1343 | { | |
1344 | struct bitmap *bitmap = mddev->bitmap; | |
1345 | int sleep; | |
1346 | ||
1347 | if (!bitmap) /* there was no bitmap */ | |
1348 | return; | |
1349 | ||
1350 | /* run the daemon_work three time to ensure everything is flushed | |
1351 | * that can be | |
1352 | */ | |
1353 | sleep = bitmap->daemon_sleep; | |
1354 | bitmap->daemon_sleep = 0; | |
1355 | bitmap_daemon_work(bitmap); | |
1356 | bitmap_daemon_work(bitmap); | |
1357 | bitmap_daemon_work(bitmap); | |
1358 | bitmap->daemon_sleep = sleep; | |
1359 | bitmap_update_sb(bitmap); | |
1360 | } | |
1361 | ||
32a7627c N |
1362 | /* |
1363 | * free memory that was allocated | |
1364 | */ | |
3178b0db | 1365 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1366 | { |
1367 | unsigned long k, pages; | |
1368 | struct bitmap_page *bp; | |
32a7627c N |
1369 | |
1370 | if (!bitmap) /* there was no bitmap */ | |
1371 | return; | |
1372 | ||
32a7627c N |
1373 | /* release the bitmap file and kill the daemon */ |
1374 | bitmap_file_put(bitmap); | |
1375 | ||
1376 | bp = bitmap->bp; | |
1377 | pages = bitmap->pages; | |
1378 | ||
1379 | /* free all allocated memory */ | |
1380 | ||
32a7627c N |
1381 | if (bp) /* deallocate the page memory */ |
1382 | for (k = 0; k < pages; k++) | |
1383 | if (bp[k].map && !bp[k].hijacked) | |
1384 | kfree(bp[k].map); | |
1385 | kfree(bp); | |
1386 | kfree(bitmap); | |
1387 | } | |
3178b0db N |
1388 | void bitmap_destroy(mddev_t *mddev) |
1389 | { | |
1390 | struct bitmap *bitmap = mddev->bitmap; | |
1391 | ||
1392 | if (!bitmap) /* there was no bitmap */ | |
1393 | return; | |
1394 | ||
1395 | mddev->bitmap = NULL; /* disconnect from the md device */ | |
b15c2e57 N |
1396 | if (mddev->thread) |
1397 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db N |
1398 | |
1399 | bitmap_free(bitmap); | |
1400 | } | |
32a7627c N |
1401 | |
1402 | /* | |
1403 | * initialize the bitmap structure | |
1404 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1405 | */ | |
1406 | int bitmap_create(mddev_t *mddev) | |
1407 | { | |
1408 | struct bitmap *bitmap; | |
1409 | unsigned long blocks = mddev->resync_max_sectors; | |
1410 | unsigned long chunks; | |
1411 | unsigned long pages; | |
1412 | struct file *file = mddev->bitmap_file; | |
1413 | int err; | |
6a07997f | 1414 | sector_t start; |
32a7627c | 1415 | |
5f6e3c83 | 1416 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1417 | |
a654b9d8 | 1418 | if (!file && !mddev->bitmap_offset) /* bitmap disabled, nothing to do */ |
32a7627c N |
1419 | return 0; |
1420 | ||
a654b9d8 N |
1421 | BUG_ON(file && mddev->bitmap_offset); |
1422 | ||
9ffae0cf | 1423 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c N |
1424 | if (!bitmap) |
1425 | return -ENOMEM; | |
1426 | ||
32a7627c | 1427 | spin_lock_init(&bitmap->lock); |
ce25c31b N |
1428 | atomic_set(&bitmap->pending_writes, 0); |
1429 | init_waitqueue_head(&bitmap->write_wait); | |
1430 | ||
32a7627c | 1431 | bitmap->mddev = mddev; |
32a7627c | 1432 | |
32a7627c | 1433 | bitmap->file = file; |
a654b9d8 | 1434 | bitmap->offset = mddev->bitmap_offset; |
ce25c31b N |
1435 | if (file) { |
1436 | get_file(file); | |
1437 | do_sync_file_range(file, 0, LLONG_MAX, | |
1438 | SYNC_FILE_RANGE_WAIT_BEFORE | | |
1439 | SYNC_FILE_RANGE_WRITE | | |
1440 | SYNC_FILE_RANGE_WAIT_AFTER); | |
1441 | } | |
32a7627c N |
1442 | /* read superblock from bitmap file (this sets bitmap->chunksize) */ |
1443 | err = bitmap_read_sb(bitmap); | |
1444 | if (err) | |
3178b0db | 1445 | goto error; |
32a7627c | 1446 | |
a638b2dc | 1447 | bitmap->chunkshift = ffz(~bitmap->chunksize); |
32a7627c N |
1448 | |
1449 | /* now that chunksize and chunkshift are set, we can use these macros */ | |
1450 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) / | |
1451 | CHUNK_BLOCK_RATIO(bitmap); | |
1452 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; | |
1453 | ||
1454 | BUG_ON(!pages); | |
1455 | ||
1456 | bitmap->chunks = chunks; | |
1457 | bitmap->pages = pages; | |
1458 | bitmap->missing_pages = pages; | |
1459 | bitmap->counter_bits = COUNTER_BITS; | |
1460 | ||
1461 | bitmap->syncchunk = ~0UL; | |
1462 | ||
44456d37 | 1463 | #ifdef INJECT_FATAL_FAULT_1 |
32a7627c N |
1464 | bitmap->bp = NULL; |
1465 | #else | |
9ffae0cf | 1466 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
32a7627c | 1467 | #endif |
3178b0db | 1468 | err = -ENOMEM; |
32a7627c | 1469 | if (!bitmap->bp) |
3178b0db | 1470 | goto error; |
32a7627c | 1471 | |
32a7627c N |
1472 | /* now that we have some pages available, initialize the in-memory |
1473 | * bitmap from the on-disk bitmap */ | |
6a07997f N |
1474 | start = 0; |
1475 | if (mddev->degraded == 0 | |
1476 | || bitmap->events_cleared == mddev->events) | |
1477 | /* no need to keep dirty bits to optimise a re-add of a missing device */ | |
1478 | start = mddev->recovery_cp; | |
1479 | err = bitmap_init_from_disk(bitmap, start); | |
193f1c93 | 1480 | |
32a7627c | 1481 | if (err) |
3178b0db | 1482 | goto error; |
32a7627c N |
1483 | |
1484 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", | |
1485 | pages, bmname(bitmap)); | |
1486 | ||
3178b0db N |
1487 | mddev->bitmap = bitmap; |
1488 | ||
b15c2e57 N |
1489 | mddev->thread->timeout = bitmap->daemon_sleep * HZ; |
1490 | ||
32a7627c | 1491 | return bitmap_update_sb(bitmap); |
3178b0db N |
1492 | |
1493 | error: | |
1494 | bitmap_free(bitmap); | |
1495 | return err; | |
32a7627c N |
1496 | } |
1497 | ||
1498 | /* the bitmap API -- for raid personalities */ | |
1499 | EXPORT_SYMBOL(bitmap_startwrite); | |
1500 | EXPORT_SYMBOL(bitmap_endwrite); | |
1501 | EXPORT_SYMBOL(bitmap_start_sync); | |
1502 | EXPORT_SYMBOL(bitmap_end_sync); | |
1503 | EXPORT_SYMBOL(bitmap_unplug); | |
1504 | EXPORT_SYMBOL(bitmap_close_sync); |