Commit | Line | Data |
---|---|---|
32a7627c N |
1 | /* |
2 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 | |
3 | * | |
4 | * bitmap_create - sets up the bitmap structure | |
5 | * bitmap_destroy - destroys the bitmap structure | |
6 | * | |
7 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: | |
8 | * - added disk storage for bitmap | |
9 | * - changes to allow various bitmap chunk sizes | |
32a7627c N |
10 | */ |
11 | ||
12 | /* | |
13 | * Still to do: | |
14 | * | |
15 | * flush after percent set rather than just time based. (maybe both). | |
32a7627c N |
16 | */ |
17 | ||
bff61975 | 18 | #include <linux/blkdev.h> |
32a7627c | 19 | #include <linux/module.h> |
32a7627c N |
20 | #include <linux/errno.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/init.h> | |
32a7627c N |
23 | #include <linux/timer.h> |
24 | #include <linux/sched.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/file.h> | |
27 | #include <linux/mount.h> | |
28 | #include <linux/buffer_head.h> | |
43b2e5d8 | 29 | #include "md.h" |
ef740c37 | 30 | #include "bitmap.h" |
32a7627c N |
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 | ||
32a7627c N |
53 | #ifndef PRINTK |
54 | # if DEBUG > 0 | |
55 | # define PRINTK(x...) printk(KERN_DEBUG x) | |
56 | # else | |
57 | # define PRINTK(x...) | |
58 | # endif | |
59 | #endif | |
60 | ||
ac2f40be | 61 | static inline char *bmname(struct bitmap *bitmap) |
32a7627c N |
62 | { |
63 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; | |
64 | } | |
65 | ||
32a7627c N |
66 | /* |
67 | * just a placeholder - calls kmalloc for bitmap pages | |
68 | */ | |
69 | static unsigned char *bitmap_alloc_page(struct bitmap *bitmap) | |
70 | { | |
71 | unsigned char *page; | |
72 | ||
44456d37 | 73 | #ifdef INJECT_FAULTS_1 |
32a7627c N |
74 | page = NULL; |
75 | #else | |
ac2f40be | 76 | page = kzalloc(PAGE_SIZE, GFP_NOIO); |
32a7627c N |
77 | #endif |
78 | if (!page) | |
79 | printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap)); | |
80 | else | |
a654b9d8 | 81 | PRINTK("%s: bitmap_alloc_page: allocated page at %p\n", |
32a7627c N |
82 | bmname(bitmap), page); |
83 | return page; | |
84 | } | |
85 | ||
86 | /* | |
87 | * for now just a placeholder -- just calls kfree for bitmap pages | |
88 | */ | |
89 | static void bitmap_free_page(struct bitmap *bitmap, unsigned char *page) | |
90 | { | |
91 | PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap), page); | |
92 | kfree(page); | |
93 | } | |
94 | ||
95 | /* | |
96 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) | |
97 | * | |
98 | * 1) check to see if this page is allocated, if it's not then try to alloc | |
99 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the | |
100 | * page pointer directly as a counter | |
101 | * | |
102 | * if we find our page, we increment the page's refcount so that it stays | |
103 | * allocated while we're using it | |
104 | */ | |
ac2f40be N |
105 | static int bitmap_checkpage(struct bitmap *bitmap, |
106 | unsigned long page, int create) | |
ee305ace N |
107 | __releases(bitmap->lock) |
108 | __acquires(bitmap->lock) | |
32a7627c N |
109 | { |
110 | unsigned char *mappage; | |
111 | ||
112 | if (page >= bitmap->pages) { | |
1187cf0a N |
113 | /* This can happen if bitmap_start_sync goes beyond |
114 | * End-of-device while looking for a whole page. | |
115 | * It is harmless. | |
116 | */ | |
32a7627c N |
117 | return -EINVAL; |
118 | } | |
119 | ||
32a7627c N |
120 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
121 | return 0; | |
122 | ||
123 | if (bitmap->bp[page].map) /* page is already allocated, just return */ | |
124 | return 0; | |
125 | ||
126 | if (!create) | |
127 | return -ENOENT; | |
128 | ||
32a7627c N |
129 | /* this page has not been allocated yet */ |
130 | ||
ac2f40be N |
131 | spin_unlock_irq(&bitmap->lock); |
132 | mappage = bitmap_alloc_page(bitmap); | |
133 | spin_lock_irq(&bitmap->lock); | |
134 | ||
135 | if (mappage == NULL) { | |
32a7627c N |
136 | PRINTK("%s: bitmap map page allocation failed, hijacking\n", |
137 | bmname(bitmap)); | |
138 | /* failed - set the hijacked flag so that we can use the | |
139 | * pointer as a counter */ | |
32a7627c N |
140 | if (!bitmap->bp[page].map) |
141 | bitmap->bp[page].hijacked = 1; | |
ac2f40be N |
142 | } else if (bitmap->bp[page].map || |
143 | bitmap->bp[page].hijacked) { | |
32a7627c N |
144 | /* somebody beat us to getting the page */ |
145 | bitmap_free_page(bitmap, mappage); | |
146 | return 0; | |
ac2f40be | 147 | } else { |
32a7627c | 148 | |
ac2f40be | 149 | /* no page was in place and we have one, so install it */ |
32a7627c | 150 | |
ac2f40be N |
151 | bitmap->bp[page].map = mappage; |
152 | bitmap->missing_pages--; | |
153 | } | |
32a7627c N |
154 | return 0; |
155 | } | |
156 | ||
32a7627c N |
157 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
158 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
159 | /* Note: lock should be held when calling this */ | |
858119e1 | 160 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
32a7627c N |
161 | { |
162 | char *ptr; | |
163 | ||
164 | if (bitmap->bp[page].count) /* page is still busy */ | |
165 | return; | |
166 | ||
167 | /* page is no longer in use, it can be released */ | |
168 | ||
169 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
170 | bitmap->bp[page].hijacked = 0; | |
171 | bitmap->bp[page].map = NULL; | |
ac2f40be N |
172 | } else { |
173 | /* normal case, free the page */ | |
174 | ptr = bitmap->bp[page].map; | |
175 | bitmap->bp[page].map = NULL; | |
176 | bitmap->missing_pages++; | |
177 | bitmap_free_page(bitmap, ptr); | |
32a7627c | 178 | } |
32a7627c N |
179 | } |
180 | ||
32a7627c N |
181 | /* |
182 | * bitmap file handling - read and write the bitmap file and its superblock | |
183 | */ | |
184 | ||
32a7627c N |
185 | /* |
186 | * basic page I/O operations | |
187 | */ | |
188 | ||
a654b9d8 | 189 | /* IO operations when bitmap is stored near all superblocks */ |
f6af949c | 190 | static struct page *read_sb_page(mddev_t *mddev, loff_t offset, |
a2ed9615 N |
191 | struct page *page, |
192 | unsigned long index, int size) | |
a654b9d8 N |
193 | { |
194 | /* choose a good rdev and read the page from there */ | |
195 | ||
196 | mdk_rdev_t *rdev; | |
a654b9d8 | 197 | sector_t target; |
ac2f40be | 198 | int did_alloc = 0; |
a654b9d8 | 199 | |
ac2f40be | 200 | if (!page) { |
a2ed9615 | 201 | page = alloc_page(GFP_KERNEL); |
ac2f40be N |
202 | if (!page) |
203 | return ERR_PTR(-ENOMEM); | |
204 | did_alloc = 1; | |
205 | } | |
a654b9d8 | 206 | |
159ec1fc | 207 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 N |
208 | if (! test_bit(In_sync, &rdev->flags) |
209 | || test_bit(Faulty, &rdev->flags)) | |
ab904d63 N |
210 | continue; |
211 | ||
0f420358 | 212 | target = rdev->sb_start + offset + index * (PAGE_SIZE/512); |
a654b9d8 | 213 | |
a2ed9615 | 214 | if (sync_page_io(rdev->bdev, target, |
e1defc4f | 215 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
a2ed9615 | 216 | page, READ)) { |
ab904d63 | 217 | page->index = index; |
ce25c31b N |
218 | attach_page_buffers(page, NULL); /* so that free_buffer will |
219 | * quietly no-op */ | |
ab904d63 N |
220 | return page; |
221 | } | |
222 | } | |
ac2f40be N |
223 | if (did_alloc) |
224 | put_page(page); | |
ab904d63 | 225 | return ERR_PTR(-EIO); |
a654b9d8 | 226 | |
a654b9d8 N |
227 | } |
228 | ||
b2d2c4ce N |
229 | static mdk_rdev_t *next_active_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
230 | { | |
231 | /* Iterate the disks of an mddev, using rcu to protect access to the | |
232 | * linked list, and raising the refcount of devices we return to ensure | |
233 | * they don't disappear while in use. | |
234 | * As devices are only added or removed when raid_disk is < 0 and | |
235 | * nr_pending is 0 and In_sync is clear, the entries we return will | |
236 | * still be in the same position on the list when we re-enter | |
237 | * list_for_each_continue_rcu. | |
238 | */ | |
239 | struct list_head *pos; | |
240 | rcu_read_lock(); | |
241 | if (rdev == NULL) | |
242 | /* start at the beginning */ | |
243 | pos = &mddev->disks; | |
244 | else { | |
245 | /* release the previous rdev and start from there. */ | |
246 | rdev_dec_pending(rdev, mddev); | |
247 | pos = &rdev->same_set; | |
248 | } | |
249 | list_for_each_continue_rcu(pos, &mddev->disks) { | |
250 | rdev = list_entry(pos, mdk_rdev_t, same_set); | |
251 | if (rdev->raid_disk >= 0 && | |
b2d2c4ce N |
252 | !test_bit(Faulty, &rdev->flags)) { |
253 | /* this is a usable devices */ | |
254 | atomic_inc(&rdev->nr_pending); | |
255 | rcu_read_unlock(); | |
256 | return rdev; | |
257 | } | |
258 | } | |
259 | rcu_read_unlock(); | |
260 | return NULL; | |
261 | } | |
262 | ||
ab6085c7 | 263 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
a654b9d8 | 264 | { |
b2d2c4ce | 265 | mdk_rdev_t *rdev = NULL; |
ab6085c7 | 266 | mddev_t *mddev = bitmap->mddev; |
a654b9d8 | 267 | |
b2d2c4ce | 268 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
ac2f40be N |
269 | int size = PAGE_SIZE; |
270 | loff_t offset = mddev->bitmap_info.offset; | |
271 | if (page->index == bitmap->file_pages-1) | |
272 | size = roundup(bitmap->last_page_size, | |
273 | bdev_logical_block_size(rdev->bdev)); | |
274 | /* Just make sure we aren't corrupting data or | |
275 | * metadata | |
276 | */ | |
277 | if (mddev->external) { | |
278 | /* Bitmap could be anywhere. */ | |
279 | if (rdev->sb_start + offset + (page->index | |
280 | * (PAGE_SIZE/512)) | |
281 | > rdev->data_offset | |
282 | && | |
283 | rdev->sb_start + offset | |
284 | < (rdev->data_offset + mddev->dev_sectors | |
285 | + (PAGE_SIZE/512))) | |
286 | goto bad_alignment; | |
287 | } else if (offset < 0) { | |
288 | /* DATA BITMAP METADATA */ | |
289 | if (offset | |
290 | + (long)(page->index * (PAGE_SIZE/512)) | |
291 | + size/512 > 0) | |
292 | /* bitmap runs in to metadata */ | |
293 | goto bad_alignment; | |
294 | if (rdev->data_offset + mddev->dev_sectors | |
295 | > rdev->sb_start + offset) | |
296 | /* data runs in to bitmap */ | |
297 | goto bad_alignment; | |
298 | } else if (rdev->sb_start < rdev->data_offset) { | |
299 | /* METADATA BITMAP DATA */ | |
300 | if (rdev->sb_start | |
301 | + offset | |
302 | + page->index*(PAGE_SIZE/512) + size/512 | |
303 | > rdev->data_offset) | |
304 | /* bitmap runs in to data */ | |
305 | goto bad_alignment; | |
306 | } else { | |
307 | /* DATA METADATA BITMAP - no problems */ | |
308 | } | |
309 | md_super_write(mddev, rdev, | |
310 | rdev->sb_start + offset | |
311 | + page->index * (PAGE_SIZE/512), | |
312 | size, | |
313 | page); | |
b2d2c4ce | 314 | } |
a654b9d8 N |
315 | |
316 | if (wait) | |
a9701a30 | 317 | md_super_wait(mddev); |
a654b9d8 | 318 | return 0; |
4b80991c N |
319 | |
320 | bad_alignment: | |
4b80991c | 321 | return -EINVAL; |
a654b9d8 N |
322 | } |
323 | ||
4ad13663 | 324 | static void bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 325 | /* |
a654b9d8 | 326 | * write out a page to a file |
32a7627c | 327 | */ |
4ad13663 | 328 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 329 | { |
d785a06a | 330 | struct buffer_head *bh; |
32a7627c | 331 | |
f0d76d70 N |
332 | if (bitmap->file == NULL) { |
333 | switch (write_sb_page(bitmap, page, wait)) { | |
334 | case -EINVAL: | |
335 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
f0d76d70 | 336 | } |
4ad13663 | 337 | } else { |
a654b9d8 | 338 | |
4ad13663 | 339 | bh = page_buffers(page); |
c708443c | 340 | |
4ad13663 N |
341 | while (bh && bh->b_blocknr) { |
342 | atomic_inc(&bitmap->pending_writes); | |
343 | set_buffer_locked(bh); | |
344 | set_buffer_mapped(bh); | |
345 | submit_bh(WRITE, bh); | |
346 | bh = bh->b_this_page; | |
347 | } | |
d785a06a | 348 | |
ac2f40be | 349 | if (wait) |
4ad13663 N |
350 | wait_event(bitmap->write_wait, |
351 | atomic_read(&bitmap->pending_writes)==0); | |
8a5e9cf1 | 352 | } |
4ad13663 N |
353 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
354 | bitmap_file_kick(bitmap); | |
d785a06a N |
355 | } |
356 | ||
357 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
358 | { | |
359 | struct bitmap *bitmap = bh->b_private; | |
360 | unsigned long flags; | |
32a7627c | 361 | |
d785a06a N |
362 | if (!uptodate) { |
363 | spin_lock_irqsave(&bitmap->lock, flags); | |
364 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
365 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
32a7627c | 366 | } |
d785a06a N |
367 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
368 | wake_up(&bitmap->write_wait); | |
369 | } | |
32a7627c | 370 | |
d785a06a N |
371 | /* copied from buffer.c */ |
372 | static void | |
373 | __clear_page_buffers(struct page *page) | |
374 | { | |
375 | ClearPagePrivate(page); | |
376 | set_page_private(page, 0); | |
377 | page_cache_release(page); | |
378 | } | |
379 | static void free_buffers(struct page *page) | |
380 | { | |
381 | struct buffer_head *bh = page_buffers(page); | |
77ad4bc7 | 382 | |
d785a06a N |
383 | while (bh) { |
384 | struct buffer_head *next = bh->b_this_page; | |
385 | free_buffer_head(bh); | |
386 | bh = next; | |
77ad4bc7 | 387 | } |
d785a06a N |
388 | __clear_page_buffers(page); |
389 | put_page(page); | |
32a7627c N |
390 | } |
391 | ||
d785a06a N |
392 | /* read a page from a file. |
393 | * We both read the page, and attach buffers to the page to record the | |
394 | * address of each block (using bmap). These addresses will be used | |
395 | * to write the block later, completely bypassing the filesystem. | |
396 | * This usage is similar to how swap files are handled, and allows us | |
397 | * to write to a file with no concerns of memory allocation failing. | |
398 | */ | |
32a7627c | 399 | static struct page *read_page(struct file *file, unsigned long index, |
d785a06a N |
400 | struct bitmap *bitmap, |
401 | unsigned long count) | |
32a7627c | 402 | { |
32a7627c | 403 | struct page *page = NULL; |
c649bb9c | 404 | struct inode *inode = file->f_path.dentry->d_inode; |
d785a06a N |
405 | struct buffer_head *bh; |
406 | sector_t block; | |
32a7627c | 407 | |
ac2f40be | 408 | PRINTK("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
2d1f3b5d | 409 | (unsigned long long)index << PAGE_SHIFT); |
32a7627c | 410 | |
d785a06a N |
411 | page = alloc_page(GFP_KERNEL); |
412 | if (!page) | |
413 | page = ERR_PTR(-ENOMEM); | |
32a7627c N |
414 | if (IS_ERR(page)) |
415 | goto out; | |
d785a06a | 416 | |
d785a06a N |
417 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
418 | if (!bh) { | |
2d1f3b5d | 419 | put_page(page); |
d785a06a | 420 | page = ERR_PTR(-ENOMEM); |
32a7627c N |
421 | goto out; |
422 | } | |
d785a06a N |
423 | attach_page_buffers(page, bh); |
424 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
425 | while (bh) { | |
426 | if (count == 0) | |
427 | bh->b_blocknr = 0; | |
428 | else { | |
429 | bh->b_blocknr = bmap(inode, block); | |
430 | if (bh->b_blocknr == 0) { | |
431 | /* Cannot use this file! */ | |
432 | free_buffers(page); | |
433 | page = ERR_PTR(-EINVAL); | |
434 | goto out; | |
435 | } | |
436 | bh->b_bdev = inode->i_sb->s_bdev; | |
437 | if (count < (1<<inode->i_blkbits)) | |
438 | count = 0; | |
439 | else | |
440 | count -= (1<<inode->i_blkbits); | |
441 | ||
442 | bh->b_end_io = end_bitmap_write; | |
443 | bh->b_private = bitmap; | |
ce25c31b N |
444 | atomic_inc(&bitmap->pending_writes); |
445 | set_buffer_locked(bh); | |
446 | set_buffer_mapped(bh); | |
447 | submit_bh(READ, bh); | |
d785a06a N |
448 | } |
449 | block++; | |
450 | bh = bh->b_this_page; | |
451 | } | |
d785a06a | 452 | page->index = index; |
ce25c31b N |
453 | |
454 | wait_event(bitmap->write_wait, | |
455 | atomic_read(&bitmap->pending_writes)==0); | |
456 | if (bitmap->flags & BITMAP_WRITE_ERROR) { | |
457 | free_buffers(page); | |
458 | page = ERR_PTR(-EIO); | |
459 | } | |
32a7627c N |
460 | out: |
461 | if (IS_ERR(page)) | |
ac2f40be | 462 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %ld\n", |
2d1f3b5d N |
463 | (int)PAGE_SIZE, |
464 | (unsigned long long)index << PAGE_SHIFT, | |
32a7627c N |
465 | PTR_ERR(page)); |
466 | return page; | |
467 | } | |
468 | ||
469 | /* | |
470 | * bitmap file superblock operations | |
471 | */ | |
472 | ||
473 | /* update the event counter and sync the superblock to disk */ | |
4ad13663 | 474 | void bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
475 | { |
476 | bitmap_super_t *sb; | |
477 | unsigned long flags; | |
478 | ||
479 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 480 | return; |
ece5cff0 N |
481 | if (bitmap->mddev->bitmap_info.external) |
482 | return; | |
32a7627c N |
483 | spin_lock_irqsave(&bitmap->lock, flags); |
484 | if (!bitmap->sb_page) { /* no superblock */ | |
485 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 486 | return; |
32a7627c | 487 | } |
32a7627c | 488 | spin_unlock_irqrestore(&bitmap->lock, flags); |
7b92813c | 489 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 490 | sb->events = cpu_to_le64(bitmap->mddev->events); |
a0da84f3 NB |
491 | if (bitmap->mddev->events < bitmap->events_cleared) { |
492 | /* rocking back to read-only */ | |
493 | bitmap->events_cleared = bitmap->mddev->events; | |
494 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); | |
495 | } | |
43a70507 N |
496 | /* Just in case these have been changed via sysfs: */ |
497 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
498 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
ea03aff9 | 499 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 500 | write_page(bitmap, bitmap->sb_page, 1); |
32a7627c N |
501 | } |
502 | ||
503 | /* print out the bitmap file superblock */ | |
504 | void bitmap_print_sb(struct bitmap *bitmap) | |
505 | { | |
506 | bitmap_super_t *sb; | |
507 | ||
508 | if (!bitmap || !bitmap->sb_page) | |
509 | return; | |
7b92813c | 510 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 511 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
512 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
513 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
514 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
515 | *(__u32 *)(sb->uuid+0), |
516 | *(__u32 *)(sb->uuid+4), | |
517 | *(__u32 *)(sb->uuid+8), | |
518 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 519 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 520 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 521 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 522 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
523 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
524 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
525 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
526 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
527 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 528 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
ea03aff9 | 529 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
530 | } |
531 | ||
532 | /* read the superblock from the bitmap file and initialize some bitmap fields */ | |
533 | static int bitmap_read_sb(struct bitmap *bitmap) | |
534 | { | |
535 | char *reason = NULL; | |
536 | bitmap_super_t *sb; | |
4b6d287f | 537 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c N |
538 | unsigned long long events; |
539 | int err = -EINVAL; | |
540 | ||
541 | /* page 0 is the superblock, read it... */ | |
f49d5e62 N |
542 | if (bitmap->file) { |
543 | loff_t isize = i_size_read(bitmap->file->f_mapping->host); | |
544 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; | |
545 | ||
546 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes); | |
547 | } else { | |
42a04b50 N |
548 | bitmap->sb_page = read_sb_page(bitmap->mddev, |
549 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
550 | NULL, |
551 | 0, sizeof(bitmap_super_t)); | |
a654b9d8 | 552 | } |
32a7627c N |
553 | if (IS_ERR(bitmap->sb_page)) { |
554 | err = PTR_ERR(bitmap->sb_page); | |
555 | bitmap->sb_page = NULL; | |
556 | return err; | |
557 | } | |
558 | ||
7b92813c | 559 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 560 | |
32a7627c | 561 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 562 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 563 | write_behind = le32_to_cpu(sb->write_behind); |
32a7627c N |
564 | |
565 | /* verify that the bitmap-specific fields are valid */ | |
566 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
567 | reason = "bad magic"; | |
bd926c63 N |
568 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
569 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) | |
32a7627c | 570 | reason = "unrecognized superblock version"; |
1187cf0a | 571 | else if (chunksize < 512) |
7dd5d34c | 572 | reason = "bitmap chunksize too small"; |
32a7627c N |
573 | else if ((1 << ffz(~chunksize)) != chunksize) |
574 | reason = "bitmap chunksize not a power of 2"; | |
1b04be96 | 575 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 576 | reason = "daemon sleep period out of range"; |
4b6d287f N |
577 | else if (write_behind > COUNTER_MAX) |
578 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
579 | if (reason) { |
580 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
581 | bmname(bitmap), reason); | |
582 | goto out; | |
583 | } | |
584 | ||
585 | /* keep the array size field of the bitmap superblock up to date */ | |
586 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
587 | ||
588 | if (!bitmap->mddev->persistent) | |
589 | goto success; | |
590 | ||
591 | /* | |
592 | * if we have a persistent array superblock, compare the | |
593 | * bitmap's UUID and event counter to the mddev's | |
594 | */ | |
595 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
596 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", | |
597 | bmname(bitmap)); | |
598 | goto out; | |
599 | } | |
600 | events = le64_to_cpu(sb->events); | |
601 | if (events < bitmap->mddev->events) { | |
602 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " | |
603 | "-- forcing full recovery\n", bmname(bitmap), events, | |
604 | (unsigned long long) bitmap->mddev->events); | |
4f2e639a | 605 | sb->state |= cpu_to_le32(BITMAP_STALE); |
32a7627c N |
606 | } |
607 | success: | |
608 | /* assign fields using values from superblock */ | |
42a04b50 N |
609 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
610 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
42a04b50 | 611 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
4f2e639a | 612 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 N |
613 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
614 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
32a7627c | 615 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
4f2e639a | 616 | if (sb->state & cpu_to_le32(BITMAP_STALE)) |
6a07997f | 617 | bitmap->events_cleared = bitmap->mddev->events; |
32a7627c N |
618 | err = 0; |
619 | out: | |
ea03aff9 | 620 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
621 | if (err) |
622 | bitmap_print_sb(bitmap); | |
623 | return err; | |
624 | } | |
625 | ||
626 | enum bitmap_mask_op { | |
627 | MASK_SET, | |
628 | MASK_UNSET | |
629 | }; | |
630 | ||
4ad13663 N |
631 | /* record the state of the bitmap in the superblock. Return the old value */ |
632 | static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, | |
633 | enum bitmap_mask_op op) | |
32a7627c N |
634 | { |
635 | bitmap_super_t *sb; | |
636 | unsigned long flags; | |
4ad13663 | 637 | int old; |
32a7627c N |
638 | |
639 | spin_lock_irqsave(&bitmap->lock, flags); | |
7e317655 | 640 | if (!bitmap->sb_page) { /* can't set the state */ |
32a7627c | 641 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 642 | return 0; |
32a7627c | 643 | } |
32a7627c | 644 | spin_unlock_irqrestore(&bitmap->lock, flags); |
7b92813c | 645 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
4ad13663 | 646 | old = le32_to_cpu(sb->state) & bits; |
32a7627c | 647 | switch (op) { |
ac2f40be N |
648 | case MASK_SET: |
649 | sb->state |= cpu_to_le32(bits); | |
650 | break; | |
651 | case MASK_UNSET: | |
652 | sb->state &= cpu_to_le32(~bits); | |
653 | break; | |
654 | default: | |
655 | BUG(); | |
32a7627c | 656 | } |
ea03aff9 | 657 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 658 | return old; |
32a7627c N |
659 | } |
660 | ||
661 | /* | |
662 | * general bitmap file operations | |
663 | */ | |
664 | ||
ece5cff0 N |
665 | /* |
666 | * on-disk bitmap: | |
667 | * | |
668 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
669 | * file a page at a time. There's a superblock at the start of the file. | |
670 | */ | |
32a7627c | 671 | /* calculate the index of the page that contains this bit */ |
ece5cff0 | 672 | static inline unsigned long file_page_index(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 673 | { |
ece5cff0 N |
674 | if (!bitmap->mddev->bitmap_info.external) |
675 | chunk += sizeof(bitmap_super_t) << 3; | |
676 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
677 | } |
678 | ||
679 | /* calculate the (bit) offset of this bit within a page */ | |
ece5cff0 | 680 | static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 681 | { |
ece5cff0 N |
682 | if (!bitmap->mddev->bitmap_info.external) |
683 | chunk += sizeof(bitmap_super_t) << 3; | |
684 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
685 | } |
686 | ||
687 | /* | |
688 | * return a pointer to the page in the filemap that contains the given bit | |
689 | * | |
690 | * this lookup is complicated by the fact that the bitmap sb might be exactly | |
691 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page | |
692 | * 0 or page 1 | |
693 | */ | |
694 | static inline struct page *filemap_get_page(struct bitmap *bitmap, | |
695 | unsigned long chunk) | |
696 | { | |
ac2f40be N |
697 | if (file_page_index(bitmap, chunk) >= bitmap->file_pages) |
698 | return NULL; | |
ece5cff0 N |
699 | return bitmap->filemap[file_page_index(bitmap, chunk) |
700 | - file_page_index(bitmap, 0)]; | |
32a7627c N |
701 | } |
702 | ||
32a7627c N |
703 | static void bitmap_file_unmap(struct bitmap *bitmap) |
704 | { | |
705 | struct page **map, *sb_page; | |
706 | unsigned long *attr; | |
707 | int pages; | |
708 | unsigned long flags; | |
709 | ||
710 | spin_lock_irqsave(&bitmap->lock, flags); | |
711 | map = bitmap->filemap; | |
712 | bitmap->filemap = NULL; | |
713 | attr = bitmap->filemap_attr; | |
714 | bitmap->filemap_attr = NULL; | |
715 | pages = bitmap->file_pages; | |
716 | bitmap->file_pages = 0; | |
717 | sb_page = bitmap->sb_page; | |
718 | bitmap->sb_page = NULL; | |
719 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
720 | ||
721 | while (pages--) | |
ece5cff0 | 722 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 723 | free_buffers(map[pages]); |
32a7627c N |
724 | kfree(map); |
725 | kfree(attr); | |
726 | ||
d785a06a N |
727 | if (sb_page) |
728 | free_buffers(sb_page); | |
32a7627c N |
729 | } |
730 | ||
731 | static void bitmap_file_put(struct bitmap *bitmap) | |
732 | { | |
733 | struct file *file; | |
32a7627c N |
734 | unsigned long flags; |
735 | ||
736 | spin_lock_irqsave(&bitmap->lock, flags); | |
737 | file = bitmap->file; | |
738 | bitmap->file = NULL; | |
739 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
740 | ||
d785a06a N |
741 | if (file) |
742 | wait_event(bitmap->write_wait, | |
743 | atomic_read(&bitmap->pending_writes)==0); | |
32a7627c N |
744 | bitmap_file_unmap(bitmap); |
745 | ||
d785a06a | 746 | if (file) { |
c649bb9c | 747 | struct inode *inode = file->f_path.dentry->d_inode; |
fc0ecff6 | 748 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 749 | fput(file); |
d785a06a | 750 | } |
32a7627c N |
751 | } |
752 | ||
32a7627c N |
753 | /* |
754 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
755 | * then it is no longer reliable, so we stop using it and we mark the file | |
756 | * as failed in the superblock | |
757 | */ | |
758 | static void bitmap_file_kick(struct bitmap *bitmap) | |
759 | { | |
760 | char *path, *ptr = NULL; | |
761 | ||
4ad13663 N |
762 | if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) { |
763 | bitmap_update_sb(bitmap); | |
32a7627c | 764 | |
4ad13663 N |
765 | if (bitmap->file) { |
766 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
767 | if (path) | |
6bcfd601 CH |
768 | ptr = d_path(&bitmap->file->f_path, path, |
769 | PAGE_SIZE); | |
770 | ||
4ad13663 N |
771 | printk(KERN_ALERT |
772 | "%s: kicking failed bitmap file %s from array!\n", | |
6bcfd601 | 773 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
32a7627c | 774 | |
4ad13663 N |
775 | kfree(path); |
776 | } else | |
777 | printk(KERN_ALERT | |
778 | "%s: disabling internal bitmap due to errors\n", | |
779 | bmname(bitmap)); | |
a654b9d8 | 780 | } |
32a7627c N |
781 | |
782 | bitmap_file_put(bitmap); | |
783 | ||
784 | return; | |
785 | } | |
786 | ||
787 | enum bitmap_page_attr { | |
ac2f40be N |
788 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
789 | BITMAP_PAGE_CLEAN = 1, /* there are bits that might need to be cleared */ | |
790 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ | |
32a7627c N |
791 | }; |
792 | ||
793 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, | |
794 | enum bitmap_page_attr attr) | |
795 | { | |
e16b68b6 | 796 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
797 | } |
798 | ||
799 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, | |
800 | enum bitmap_page_attr attr) | |
801 | { | |
e16b68b6 | 802 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
803 | } |
804 | ||
ec7a3197 N |
805 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
806 | enum bitmap_page_attr attr) | |
32a7627c | 807 | { |
e16b68b6 | 808 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
809 | } |
810 | ||
811 | /* | |
812 | * bitmap_file_set_bit -- called before performing a write to the md device | |
813 | * to set (and eventually sync) a particular bit in the bitmap file | |
814 | * | |
815 | * we set the bit immediately, then we record the page number so that | |
816 | * when an unplug occurs, we can flush the dirty pages out to disk | |
817 | */ | |
818 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
819 | { | |
820 | unsigned long bit; | |
821 | struct page *page; | |
822 | void *kaddr; | |
823 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); | |
824 | ||
ac2f40be | 825 | if (!bitmap->filemap) |
32a7627c | 826 | return; |
32a7627c N |
827 | |
828 | page = filemap_get_page(bitmap, chunk); | |
ac2f40be N |
829 | if (!page) |
830 | return; | |
ece5cff0 | 831 | bit = file_page_offset(bitmap, chunk); |
32a7627c | 832 | |
ac2f40be | 833 | /* set the bit */ |
32a7627c | 834 | kaddr = kmap_atomic(page, KM_USER0); |
bd926c63 N |
835 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
836 | set_bit(bit, kaddr); | |
837 | else | |
838 | ext2_set_bit(bit, kaddr); | |
32a7627c N |
839 | kunmap_atomic(kaddr, KM_USER0); |
840 | PRINTK("set file bit %lu page %lu\n", bit, page->index); | |
841 | ||
842 | /* record page number so it gets flushed to disk when unplug occurs */ | |
843 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); | |
32a7627c N |
844 | } |
845 | ||
846 | /* this gets called when the md device is ready to unplug its underlying | |
847 | * (slave) device queues -- before we let any writes go down, we need to | |
848 | * sync the dirty pages of the bitmap file to disk */ | |
4ad13663 | 849 | void bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 850 | { |
ec7a3197 N |
851 | unsigned long i, flags; |
852 | int dirty, need_write; | |
32a7627c N |
853 | struct page *page; |
854 | int wait = 0; | |
855 | ||
856 | if (!bitmap) | |
4ad13663 | 857 | return; |
32a7627c N |
858 | |
859 | /* look at each page to see if there are any set bits that need to be | |
860 | * flushed out to disk */ | |
861 | for (i = 0; i < bitmap->file_pages; i++) { | |
862 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 863 | if (!bitmap->filemap) { |
32a7627c | 864 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 865 | return; |
32a7627c N |
866 | } |
867 | page = bitmap->filemap[i]; | |
ec7a3197 N |
868 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
869 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
32a7627c N |
870 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
871 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
ec7a3197 | 872 | if (dirty) |
32a7627c N |
873 | wait = 1; |
874 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
875 | ||
ac2f40be | 876 | if (dirty || need_write) |
4ad13663 | 877 | write_page(bitmap, page, 0); |
32a7627c N |
878 | } |
879 | if (wait) { /* if any writes were performed, we need to wait on them */ | |
0b79ccf0 | 880 | if (bitmap->file) |
d785a06a N |
881 | wait_event(bitmap->write_wait, |
882 | atomic_read(&bitmap->pending_writes)==0); | |
0b79ccf0 | 883 | else |
a9701a30 | 884 | md_super_wait(bitmap->mddev); |
32a7627c | 885 | } |
d785a06a N |
886 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
887 | bitmap_file_kick(bitmap); | |
32a7627c | 888 | } |
ac2f40be | 889 | EXPORT_SYMBOL(bitmap_unplug); |
32a7627c | 890 | |
6a07997f | 891 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
892 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
893 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
894 | * memory mapping of the bitmap file | |
895 | * Special cases: | |
896 | * if there's no bitmap file, or if the bitmap file had been | |
897 | * previously kicked from the array, we mark all the bits as | |
898 | * 1's in order to cause a full resync. | |
6a07997f N |
899 | * |
900 | * We ignore all bits for sectors that end earlier than 'start'. | |
901 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 902 | */ |
6a07997f | 903 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c N |
904 | { |
905 | unsigned long i, chunks, index, oldindex, bit; | |
906 | struct page *page = NULL, *oldpage = NULL; | |
907 | unsigned long num_pages, bit_cnt = 0; | |
908 | struct file *file; | |
d785a06a | 909 | unsigned long bytes, offset; |
32a7627c N |
910 | int outofdate; |
911 | int ret = -ENOSPC; | |
ea03aff9 | 912 | void *paddr; |
32a7627c N |
913 | |
914 | chunks = bitmap->chunks; | |
915 | file = bitmap->file; | |
916 | ||
42a04b50 | 917 | BUG_ON(!file && !bitmap->mddev->bitmap_info.offset); |
32a7627c | 918 | |
44456d37 | 919 | #ifdef INJECT_FAULTS_3 |
32a7627c N |
920 | outofdate = 1; |
921 | #else | |
922 | outofdate = bitmap->flags & BITMAP_STALE; | |
923 | #endif | |
924 | if (outofdate) | |
925 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
926 | "recovery\n", bmname(bitmap)); | |
927 | ||
928 | bytes = (chunks + 7) / 8; | |
ece5cff0 N |
929 | if (!bitmap->mddev->bitmap_info.external) |
930 | bytes += sizeof(bitmap_super_t); | |
bc7f77de | 931 | |
ece5cff0 | 932 | num_pages = (bytes + PAGE_SIZE - 1) / PAGE_SIZE; |
bc7f77de | 933 | |
ece5cff0 | 934 | if (file && i_size_read(file->f_mapping->host) < bytes) { |
32a7627c N |
935 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
936 | bmname(bitmap), | |
937 | (unsigned long) i_size_read(file->f_mapping->host), | |
ece5cff0 | 938 | bytes); |
4ad13663 | 939 | goto err; |
32a7627c | 940 | } |
bc7f77de N |
941 | |
942 | ret = -ENOMEM; | |
943 | ||
32a7627c | 944 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
bc7f77de | 945 | if (!bitmap->filemap) |
4ad13663 | 946 | goto err; |
32a7627c | 947 | |
e16b68b6 N |
948 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
949 | bitmap->filemap_attr = kzalloc( | |
ac2f40be | 950 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
e16b68b6 | 951 | GFP_KERNEL); |
bc7f77de | 952 | if (!bitmap->filemap_attr) |
4ad13663 | 953 | goto err; |
32a7627c | 954 | |
32a7627c N |
955 | oldindex = ~0L; |
956 | ||
957 | for (i = 0; i < chunks; i++) { | |
bd926c63 | 958 | int b; |
ece5cff0 N |
959 | index = file_page_index(bitmap, i); |
960 | bit = file_page_offset(bitmap, i); | |
32a7627c | 961 | if (index != oldindex) { /* this is a new page, read it in */ |
d785a06a | 962 | int count; |
32a7627c | 963 | /* unmap the old page, we're done with it */ |
d785a06a | 964 | if (index == num_pages-1) |
ece5cff0 | 965 | count = bytes - index * PAGE_SIZE; |
d785a06a N |
966 | else |
967 | count = PAGE_SIZE; | |
ece5cff0 | 968 | if (index == 0 && bitmap->sb_page) { |
32a7627c N |
969 | /* |
970 | * if we're here then the superblock page | |
971 | * contains some bits (PAGE_SIZE != sizeof sb) | |
972 | * we've already read it in, so just use it | |
973 | */ | |
974 | page = bitmap->sb_page; | |
975 | offset = sizeof(bitmap_super_t); | |
53845270 N |
976 | if (!file) |
977 | read_sb_page(bitmap->mddev, | |
42a04b50 | 978 | bitmap->mddev->bitmap_info.offset, |
53845270 N |
979 | page, |
980 | index, count); | |
a654b9d8 | 981 | } else if (file) { |
d785a06a | 982 | page = read_page(file, index, bitmap, count); |
a654b9d8 N |
983 | offset = 0; |
984 | } else { | |
42a04b50 N |
985 | page = read_sb_page(bitmap->mddev, |
986 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
987 | NULL, |
988 | index, count); | |
32a7627c N |
989 | offset = 0; |
990 | } | |
a654b9d8 N |
991 | if (IS_ERR(page)) { /* read error */ |
992 | ret = PTR_ERR(page); | |
4ad13663 | 993 | goto err; |
a654b9d8 N |
994 | } |
995 | ||
32a7627c N |
996 | oldindex = index; |
997 | oldpage = page; | |
32a7627c | 998 | |
b74fd282 N |
999 | bitmap->filemap[bitmap->file_pages++] = page; |
1000 | bitmap->last_page_size = count; | |
1001 | ||
32a7627c N |
1002 | if (outofdate) { |
1003 | /* | |
1004 | * if bitmap is out of date, dirty the | |
ac2f40be | 1005 | * whole page and write it out |
32a7627c | 1006 | */ |
ea03aff9 N |
1007 | paddr = kmap_atomic(page, KM_USER0); |
1008 | memset(paddr + offset, 0xff, | |
6a07997f | 1009 | PAGE_SIZE - offset); |
ea03aff9 | 1010 | kunmap_atomic(paddr, KM_USER0); |
4ad13663 N |
1011 | write_page(bitmap, page, 1); |
1012 | ||
1013 | ret = -EIO; | |
b74fd282 | 1014 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
4ad13663 | 1015 | goto err; |
32a7627c | 1016 | } |
32a7627c | 1017 | } |
ea03aff9 | 1018 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1019 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 1020 | b = test_bit(bit, paddr); |
bd926c63 | 1021 | else |
ea03aff9 N |
1022 | b = ext2_test_bit(bit, paddr); |
1023 | kunmap_atomic(paddr, KM_USER0); | |
bd926c63 | 1024 | if (b) { |
32a7627c | 1025 | /* if the disk bit is set, set the memory bit */ |
db305e50 N |
1026 | int needed = ((sector_t)(i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) |
1027 | >= start); | |
1028 | bitmap_set_memory_bits(bitmap, | |
1029 | (sector_t)i << CHUNK_BLOCK_SHIFT(bitmap), | |
1030 | needed); | |
32a7627c | 1031 | bit_cnt++; |
6a07997f | 1032 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
32a7627c | 1033 | } |
32a7627c N |
1034 | } |
1035 | ||
ac2f40be | 1036 | /* everything went OK */ |
32a7627c N |
1037 | ret = 0; |
1038 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); | |
1039 | ||
32a7627c N |
1040 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
1041 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
1042 | md_wakeup_thread(bitmap->mddev->thread); | |
1043 | } | |
1044 | ||
32a7627c | 1045 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
4ad13663 N |
1046 | "read %lu/%lu pages, set %lu bits\n", |
1047 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt); | |
1048 | ||
1049 | return 0; | |
32a7627c | 1050 | |
4ad13663 N |
1051 | err: |
1052 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", | |
1053 | bmname(bitmap), ret); | |
32a7627c N |
1054 | return ret; |
1055 | } | |
1056 | ||
a654b9d8 N |
1057 | void bitmap_write_all(struct bitmap *bitmap) |
1058 | { | |
1059 | /* We don't actually write all bitmap blocks here, | |
1060 | * just flag them as needing to be written | |
1061 | */ | |
ec7a3197 | 1062 | int i; |
a654b9d8 | 1063 | |
ac2f40be | 1064 | for (i = 0; i < bitmap->file_pages; i++) |
ec7a3197 N |
1065 | set_page_attr(bitmap, bitmap->filemap[i], |
1066 | BITMAP_PAGE_NEEDWRITE); | |
a654b9d8 N |
1067 | } |
1068 | ||
32a7627c N |
1069 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
1070 | { | |
1071 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1072 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1073 | bitmap->bp[page].count += inc; | |
32a7627c N |
1074 | bitmap_checkfree(bitmap, page); |
1075 | } | |
1076 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, | |
1077 | sector_t offset, int *blocks, | |
1078 | int create); | |
1079 | ||
1080 | /* | |
1081 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1082 | * out to disk | |
1083 | */ | |
1084 | ||
aa5cbd10 | 1085 | void bitmap_daemon_work(mddev_t *mddev) |
32a7627c | 1086 | { |
aa5cbd10 | 1087 | struct bitmap *bitmap; |
aa3163f8 | 1088 | unsigned long j; |
32a7627c N |
1089 | unsigned long flags; |
1090 | struct page *page = NULL, *lastpage = NULL; | |
32a7627c | 1091 | int blocks; |
ea03aff9 | 1092 | void *paddr; |
32a7627c | 1093 | |
aa5cbd10 N |
1094 | /* Use a mutex to guard daemon_work against |
1095 | * bitmap_destroy. | |
1096 | */ | |
c3d9714e | 1097 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1098 | bitmap = mddev->bitmap; |
1099 | if (bitmap == NULL) { | |
c3d9714e | 1100 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1101 | return; |
aa5cbd10 | 1102 | } |
42a04b50 | 1103 | if (time_before(jiffies, bitmap->daemon_lastrun |
1b04be96 | 1104 | + bitmap->mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1105 | goto done; |
1106 | ||
32a7627c | 1107 | bitmap->daemon_lastrun = jiffies; |
8311c29d N |
1108 | if (bitmap->allclean) { |
1109 | bitmap->mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
aa5cbd10 | 1110 | goto done; |
8311c29d N |
1111 | } |
1112 | bitmap->allclean = 1; | |
32a7627c | 1113 | |
be512691 | 1114 | spin_lock_irqsave(&bitmap->lock, flags); |
32a7627c N |
1115 | for (j = 0; j < bitmap->chunks; j++) { |
1116 | bitmap_counter_t *bmc; | |
be512691 | 1117 | if (!bitmap->filemap) |
32a7627c | 1118 | /* error or shutdown */ |
32a7627c | 1119 | break; |
32a7627c N |
1120 | |
1121 | page = filemap_get_page(bitmap, j); | |
32a7627c N |
1122 | |
1123 | if (page != lastpage) { | |
aa3163f8 | 1124 | /* skip this page unless it's marked as needing cleaning */ |
ec7a3197 N |
1125 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) { |
1126 | int need_write = test_page_attr(bitmap, page, | |
1127 | BITMAP_PAGE_NEEDWRITE); | |
a647e4bc | 1128 | if (need_write) |
aa3163f8 | 1129 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
a647e4bc | 1130 | |
aa3163f8 | 1131 | spin_unlock_irqrestore(&bitmap->lock, flags); |
8311c29d | 1132 | if (need_write) { |
4ad13663 | 1133 | write_page(bitmap, page, 0); |
8311c29d N |
1134 | bitmap->allclean = 0; |
1135 | } | |
be512691 N |
1136 | spin_lock_irqsave(&bitmap->lock, flags); |
1137 | j |= (PAGE_BITS - 1); | |
aa3163f8 N |
1138 | continue; |
1139 | } | |
1140 | ||
32a7627c | 1141 | /* grab the new page, sync and release the old */ |
32a7627c | 1142 | if (lastpage != NULL) { |
ec7a3197 | 1143 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1144 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1145 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 1146 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1147 | } else { |
1148 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1149 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1150 | } | |
32a7627c N |
1151 | } else |
1152 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1153 | lastpage = page; | |
a0da84f3 NB |
1154 | |
1155 | /* We are possibly going to clear some bits, so make | |
1156 | * sure that events_cleared is up-to-date. | |
1157 | */ | |
ece5cff0 N |
1158 | if (bitmap->need_sync && |
1159 | bitmap->mddev->bitmap_info.external == 0) { | |
a0da84f3 NB |
1160 | bitmap_super_t *sb; |
1161 | bitmap->need_sync = 0; | |
1162 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); | |
1163 | sb->events_cleared = | |
1164 | cpu_to_le64(bitmap->events_cleared); | |
1165 | kunmap_atomic(sb, KM_USER0); | |
1166 | write_page(bitmap, bitmap->sb_page, 1); | |
1167 | } | |
32a7627c | 1168 | spin_lock_irqsave(&bitmap->lock, flags); |
ece5cff0 N |
1169 | if (!bitmap->need_sync) |
1170 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
32a7627c | 1171 | } |
db305e50 N |
1172 | bmc = bitmap_get_counter(bitmap, |
1173 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
1174 | &blocks, 0); | |
32a7627c | 1175 | if (bmc) { |
8311c29d N |
1176 | if (*bmc) |
1177 | bitmap->allclean = 0; | |
1178 | ||
32a7627c | 1179 | if (*bmc == 2) { |
ac2f40be | 1180 | *bmc = 1; /* maybe clear the bit next time */ |
32a7627c | 1181 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
ece5cff0 | 1182 | } else if (*bmc == 1 && !bitmap->need_sync) { |
32a7627c N |
1183 | /* we can clear the bit */ |
1184 | *bmc = 0; | |
db305e50 N |
1185 | bitmap_count_page(bitmap, |
1186 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
32a7627c N |
1187 | -1); |
1188 | ||
1189 | /* clear the bit */ | |
ea03aff9 | 1190 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1191 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ece5cff0 N |
1192 | clear_bit(file_page_offset(bitmap, j), |
1193 | paddr); | |
bd926c63 | 1194 | else |
ece5cff0 N |
1195 | ext2_clear_bit(file_page_offset(bitmap, j), |
1196 | paddr); | |
ea03aff9 | 1197 | kunmap_atomic(paddr, KM_USER0); |
32a7627c | 1198 | } |
be512691 N |
1199 | } else |
1200 | j |= PAGE_COUNTER_MASK; | |
32a7627c | 1201 | } |
be512691 | 1202 | spin_unlock_irqrestore(&bitmap->lock, flags); |
32a7627c N |
1203 | |
1204 | /* now sync the final page */ | |
1205 | if (lastpage != NULL) { | |
32a7627c | 1206 | spin_lock_irqsave(&bitmap->lock, flags); |
ec7a3197 | 1207 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1208 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1209 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 1210 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1211 | } else { |
1212 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1213 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1214 | } | |
32a7627c N |
1215 | } |
1216 | ||
7be3dfec | 1217 | done: |
8311c29d | 1218 | if (bitmap->allclean == 0) |
ac2f40be | 1219 | bitmap->mddev->thread->timeout = |
1b04be96 | 1220 | bitmap->mddev->bitmap_info.daemon_sleep; |
c3d9714e | 1221 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1222 | } |
1223 | ||
32a7627c N |
1224 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
1225 | sector_t offset, int *blocks, | |
1226 | int create) | |
ee305ace N |
1227 | __releases(bitmap->lock) |
1228 | __acquires(bitmap->lock) | |
32a7627c N |
1229 | { |
1230 | /* If 'create', we might release the lock and reclaim it. | |
1231 | * The lock must have been taken with interrupts enabled. | |
1232 | * If !create, we don't release the lock. | |
1233 | */ | |
1234 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1235 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1236 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1237 | sector_t csize; | |
1238 | ||
1239 | if (bitmap_checkpage(bitmap, page, create) < 0) { | |
1240 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
ac2f40be | 1241 | *blocks = csize - (offset & (csize - 1)); |
32a7627c N |
1242 | return NULL; |
1243 | } | |
1244 | /* now locked ... */ | |
1245 | ||
1246 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1247 | /* should we use the first or second counter field | |
1248 | * of the hijacked pointer? */ | |
1249 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
1250 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + | |
1251 | PAGE_COUNTER_SHIFT - 1); | |
ac2f40be | 1252 | *blocks = csize - (offset & (csize - 1)); |
32a7627c N |
1253 | return &((bitmap_counter_t *) |
1254 | &bitmap->bp[page].map)[hi]; | |
1255 | } else { /* page is allocated */ | |
1256 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
ac2f40be | 1257 | *blocks = csize - (offset & (csize - 1)); |
32a7627c N |
1258 | return (bitmap_counter_t *) |
1259 | &(bitmap->bp[page].map[pageoff]); | |
1260 | } | |
1261 | } | |
1262 | ||
4b6d287f | 1263 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1264 | { |
ac2f40be N |
1265 | if (!bitmap) |
1266 | return 0; | |
4b6d287f N |
1267 | |
1268 | if (behind) { | |
696fcd53 | 1269 | int bw; |
4b6d287f | 1270 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1271 | bw = atomic_read(&bitmap->behind_writes); |
1272 | if (bw > bitmap->behind_writes_used) | |
1273 | bitmap->behind_writes_used = bw; | |
1274 | ||
4b6d287f | 1275 | PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", |
696fcd53 | 1276 | bw, bitmap->max_write_behind); |
4b6d287f N |
1277 | } |
1278 | ||
32a7627c N |
1279 | while (sectors) { |
1280 | int blocks; | |
1281 | bitmap_counter_t *bmc; | |
1282 | ||
1283 | spin_lock_irq(&bitmap->lock); | |
1284 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); | |
1285 | if (!bmc) { | |
1286 | spin_unlock_irq(&bitmap->lock); | |
1287 | return 0; | |
1288 | } | |
1289 | ||
da6e1a32 NB |
1290 | if (unlikely((*bmc & COUNTER_MAX) == COUNTER_MAX)) { |
1291 | DEFINE_WAIT(__wait); | |
1292 | /* note that it is safe to do the prepare_to_wait | |
1293 | * after the test as long as we do it before dropping | |
1294 | * the spinlock. | |
1295 | */ | |
1296 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1297 | TASK_UNINTERRUPTIBLE); | |
1298 | spin_unlock_irq(&bitmap->lock); | |
2ad8b1ef | 1299 | blk_unplug(bitmap->mddev->queue); |
da6e1a32 NB |
1300 | schedule(); |
1301 | finish_wait(&bitmap->overflow_wait, &__wait); | |
1302 | continue; | |
1303 | } | |
1304 | ||
ac2f40be | 1305 | switch (*bmc) { |
32a7627c N |
1306 | case 0: |
1307 | bitmap_file_set_bit(bitmap, offset); | |
ac2f40be | 1308 | bitmap_count_page(bitmap, offset, 1); |
93769f58 | 1309 | blk_plug_device_unlocked(bitmap->mddev->queue); |
32a7627c N |
1310 | /* fall through */ |
1311 | case 1: | |
1312 | *bmc = 2; | |
1313 | } | |
da6e1a32 | 1314 | |
32a7627c N |
1315 | (*bmc)++; |
1316 | ||
1317 | spin_unlock_irq(&bitmap->lock); | |
1318 | ||
1319 | offset += blocks; | |
1320 | if (sectors > blocks) | |
1321 | sectors -= blocks; | |
ac2f40be N |
1322 | else |
1323 | sectors = 0; | |
32a7627c | 1324 | } |
8311c29d | 1325 | bitmap->allclean = 0; |
32a7627c N |
1326 | return 0; |
1327 | } | |
ac2f40be | 1328 | EXPORT_SYMBOL(bitmap_startwrite); |
32a7627c N |
1329 | |
1330 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1331 | int success, int behind) |
32a7627c | 1332 | { |
ac2f40be N |
1333 | if (!bitmap) |
1334 | return; | |
4b6d287f | 1335 | if (behind) { |
e555190d N |
1336 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1337 | wake_up(&bitmap->behind_wait); | |
4b6d287f N |
1338 | PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", |
1339 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1340 | } | |
d0a4bb49 N |
1341 | if (bitmap->mddev->degraded) |
1342 | /* Never clear bits or update events_cleared when degraded */ | |
1343 | success = 0; | |
4b6d287f | 1344 | |
32a7627c N |
1345 | while (sectors) { |
1346 | int blocks; | |
1347 | unsigned long flags; | |
1348 | bitmap_counter_t *bmc; | |
1349 | ||
1350 | spin_lock_irqsave(&bitmap->lock, flags); | |
1351 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); | |
1352 | if (!bmc) { | |
1353 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1354 | return; | |
1355 | } | |
1356 | ||
a0da84f3 NB |
1357 | if (success && |
1358 | bitmap->events_cleared < bitmap->mddev->events) { | |
1359 | bitmap->events_cleared = bitmap->mddev->events; | |
1360 | bitmap->need_sync = 1; | |
5ff5afff | 1361 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1362 | } |
1363 | ||
32a7627c N |
1364 | if (!success && ! (*bmc & NEEDED_MASK)) |
1365 | *bmc |= NEEDED_MASK; | |
1366 | ||
da6e1a32 NB |
1367 | if ((*bmc & COUNTER_MAX) == COUNTER_MAX) |
1368 | wake_up(&bitmap->overflow_wait); | |
1369 | ||
32a7627c | 1370 | (*bmc)--; |
ac2f40be | 1371 | if (*bmc <= 2) |
32a7627c N |
1372 | set_page_attr(bitmap, |
1373 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1374 | BITMAP_PAGE_CLEAN); | |
ac2f40be | 1375 | |
32a7627c N |
1376 | spin_unlock_irqrestore(&bitmap->lock, flags); |
1377 | offset += blocks; | |
1378 | if (sectors > blocks) | |
1379 | sectors -= blocks; | |
ac2f40be N |
1380 | else |
1381 | sectors = 0; | |
32a7627c N |
1382 | } |
1383 | } | |
ac2f40be | 1384 | EXPORT_SYMBOL(bitmap_endwrite); |
32a7627c | 1385 | |
1187cf0a N |
1386 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, |
1387 | int degraded) | |
32a7627c N |
1388 | { |
1389 | bitmap_counter_t *bmc; | |
1390 | int rv; | |
1391 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1392 | *blocks = 1024; | |
1393 | return 1; /* always resync if no bitmap */ | |
1394 | } | |
1395 | spin_lock_irq(&bitmap->lock); | |
1396 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1397 | rv = 0; | |
1398 | if (bmc) { | |
1399 | /* locked */ | |
1400 | if (RESYNC(*bmc)) | |
1401 | rv = 1; | |
1402 | else if (NEEDED(*bmc)) { | |
1403 | rv = 1; | |
6a806c51 N |
1404 | if (!degraded) { /* don't set/clear bits if degraded */ |
1405 | *bmc |= RESYNC_MASK; | |
1406 | *bmc &= ~NEEDED_MASK; | |
1407 | } | |
32a7627c N |
1408 | } |
1409 | } | |
1410 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1411 | bitmap->allclean = 0; |
32a7627c N |
1412 | return rv; |
1413 | } | |
1414 | ||
1187cf0a N |
1415 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, |
1416 | int degraded) | |
1417 | { | |
1418 | /* bitmap_start_sync must always report on multiples of whole | |
1419 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1420 | * get confused. | |
1421 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1422 | * At least PAGE_SIZE>>9 blocks are covered. | |
1423 | * Return the 'or' of the result. | |
1424 | */ | |
1425 | int rv = 0; | |
1426 | int blocks1; | |
1427 | ||
1428 | *blocks = 0; | |
1429 | while (*blocks < (PAGE_SIZE>>9)) { | |
1430 | rv |= __bitmap_start_sync(bitmap, offset, | |
1431 | &blocks1, degraded); | |
1432 | offset += blocks1; | |
1433 | *blocks += blocks1; | |
1434 | } | |
1435 | return rv; | |
1436 | } | |
ac2f40be | 1437 | EXPORT_SYMBOL(bitmap_start_sync); |
1187cf0a | 1438 | |
32a7627c N |
1439 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted) |
1440 | { | |
1441 | bitmap_counter_t *bmc; | |
1442 | unsigned long flags; | |
ac2f40be N |
1443 | |
1444 | if (bitmap == NULL) { | |
32a7627c N |
1445 | *blocks = 1024; |
1446 | return; | |
1447 | } | |
1448 | spin_lock_irqsave(&bitmap->lock, flags); | |
1449 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1450 | if (bmc == NULL) | |
1451 | goto unlock; | |
1452 | /* locked */ | |
32a7627c N |
1453 | if (RESYNC(*bmc)) { |
1454 | *bmc &= ~RESYNC_MASK; | |
1455 | ||
1456 | if (!NEEDED(*bmc) && aborted) | |
1457 | *bmc |= NEEDED_MASK; | |
1458 | else { | |
ac2f40be | 1459 | if (*bmc <= 2) |
32a7627c N |
1460 | set_page_attr(bitmap, |
1461 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1462 | BITMAP_PAGE_CLEAN); | |
32a7627c N |
1463 | } |
1464 | } | |
1465 | unlock: | |
1466 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
8311c29d | 1467 | bitmap->allclean = 0; |
32a7627c | 1468 | } |
ac2f40be | 1469 | EXPORT_SYMBOL(bitmap_end_sync); |
32a7627c N |
1470 | |
1471 | void bitmap_close_sync(struct bitmap *bitmap) | |
1472 | { | |
1473 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1474 | * properly have been aborted. It remains to us to clear the | |
1475 | * RESYNC bit wherever it is still on | |
1476 | */ | |
1477 | sector_t sector = 0; | |
1478 | int blocks; | |
b47490c9 N |
1479 | if (!bitmap) |
1480 | return; | |
32a7627c N |
1481 | while (sector < bitmap->mddev->resync_max_sectors) { |
1482 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
b47490c9 N |
1483 | sector += blocks; |
1484 | } | |
1485 | } | |
ac2f40be | 1486 | EXPORT_SYMBOL(bitmap_close_sync); |
b47490c9 N |
1487 | |
1488 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) | |
1489 | { | |
1490 | sector_t s = 0; | |
1491 | int blocks; | |
1492 | ||
1493 | if (!bitmap) | |
1494 | return; | |
1495 | if (sector == 0) { | |
1496 | bitmap->last_end_sync = jiffies; | |
1497 | return; | |
1498 | } | |
1499 | if (time_before(jiffies, (bitmap->last_end_sync | |
1b04be96 | 1500 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1501 | return; |
1502 | wait_event(bitmap->mddev->recovery_wait, | |
1503 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1504 | ||
97e4f42d | 1505 | bitmap->mddev->curr_resync_completed = bitmap->mddev->curr_resync; |
676e42d8 N |
1506 | if (bitmap->mddev->persistent) |
1507 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); | |
b47490c9 N |
1508 | sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1); |
1509 | s = 0; | |
1510 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
1511 | bitmap_end_sync(bitmap, s, &blocks, 0); | |
1512 | s += blocks; | |
32a7627c | 1513 | } |
b47490c9 | 1514 | bitmap->last_end_sync = jiffies; |
acb180b0 | 1515 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
32a7627c | 1516 | } |
ac2f40be | 1517 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
32a7627c | 1518 | |
6a07997f | 1519 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1520 | { |
1521 | /* For each chunk covered by any of these sectors, set the | |
193f1c93 | 1522 | * counter to 1 and set resync_needed. They should all |
32a7627c N |
1523 | * be 0 at this point |
1524 | */ | |
193f1c93 N |
1525 | |
1526 | int secs; | |
1527 | bitmap_counter_t *bmc; | |
1528 | spin_lock_irq(&bitmap->lock); | |
1529 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); | |
1530 | if (!bmc) { | |
32a7627c | 1531 | spin_unlock_irq(&bitmap->lock); |
193f1c93 | 1532 | return; |
32a7627c | 1533 | } |
ac2f40be | 1534 | if (!*bmc) { |
193f1c93 | 1535 | struct page *page; |
ac2f40be | 1536 | *bmc = 1 | (needed ? NEEDED_MASK : 0); |
193f1c93 N |
1537 | bitmap_count_page(bitmap, offset, 1); |
1538 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); | |
1539 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1540 | } | |
1541 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1542 | bitmap->allclean = 0; |
32a7627c N |
1543 | } |
1544 | ||
9b1d1dac PC |
1545 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1546 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1547 | { | |
1548 | unsigned long chunk; | |
1549 | ||
1550 | for (chunk = s; chunk <= e; chunk++) { | |
db305e50 | 1551 | sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap); |
9b1d1dac PC |
1552 | bitmap_set_memory_bits(bitmap, sec, 1); |
1553 | bitmap_file_set_bit(bitmap, sec); | |
ffa23322 N |
1554 | if (sec < bitmap->mddev->recovery_cp) |
1555 | /* We are asserting that the array is dirty, | |
1556 | * so move the recovery_cp address back so | |
1557 | * that it is obvious that it is dirty | |
1558 | */ | |
1559 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1560 | } |
1561 | } | |
1562 | ||
6b8b3e8a N |
1563 | /* |
1564 | * flush out any pending updates | |
1565 | */ | |
1566 | void bitmap_flush(mddev_t *mddev) | |
1567 | { | |
1568 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1569 | long sleep; |
6b8b3e8a N |
1570 | |
1571 | if (!bitmap) /* there was no bitmap */ | |
1572 | return; | |
1573 | ||
1574 | /* run the daemon_work three time to ensure everything is flushed | |
1575 | * that can be | |
1576 | */ | |
1b04be96 | 1577 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1578 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1579 | bitmap_daemon_work(mddev); |
42a04b50 | 1580 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1581 | bitmap_daemon_work(mddev); |
42a04b50 | 1582 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1583 | bitmap_daemon_work(mddev); |
6b8b3e8a N |
1584 | bitmap_update_sb(bitmap); |
1585 | } | |
1586 | ||
32a7627c N |
1587 | /* |
1588 | * free memory that was allocated | |
1589 | */ | |
3178b0db | 1590 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1591 | { |
1592 | unsigned long k, pages; | |
1593 | struct bitmap_page *bp; | |
32a7627c N |
1594 | |
1595 | if (!bitmap) /* there was no bitmap */ | |
1596 | return; | |
1597 | ||
32a7627c N |
1598 | /* release the bitmap file and kill the daemon */ |
1599 | bitmap_file_put(bitmap); | |
1600 | ||
1601 | bp = bitmap->bp; | |
1602 | pages = bitmap->pages; | |
1603 | ||
1604 | /* free all allocated memory */ | |
1605 | ||
32a7627c N |
1606 | if (bp) /* deallocate the page memory */ |
1607 | for (k = 0; k < pages; k++) | |
1608 | if (bp[k].map && !bp[k].hijacked) | |
1609 | kfree(bp[k].map); | |
1610 | kfree(bp); | |
1611 | kfree(bitmap); | |
1612 | } | |
aa5cbd10 | 1613 | |
3178b0db N |
1614 | void bitmap_destroy(mddev_t *mddev) |
1615 | { | |
1616 | struct bitmap *bitmap = mddev->bitmap; | |
1617 | ||
1618 | if (!bitmap) /* there was no bitmap */ | |
1619 | return; | |
1620 | ||
c3d9714e | 1621 | mutex_lock(&mddev->bitmap_info.mutex); |
3178b0db | 1622 | mddev->bitmap = NULL; /* disconnect from the md device */ |
c3d9714e | 1623 | mutex_unlock(&mddev->bitmap_info.mutex); |
b15c2e57 N |
1624 | if (mddev->thread) |
1625 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db | 1626 | |
ece5cff0 N |
1627 | if (bitmap->sysfs_can_clear) |
1628 | sysfs_put(bitmap->sysfs_can_clear); | |
1629 | ||
3178b0db N |
1630 | bitmap_free(bitmap); |
1631 | } | |
32a7627c N |
1632 | |
1633 | /* | |
1634 | * initialize the bitmap structure | |
1635 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1636 | */ | |
1637 | int bitmap_create(mddev_t *mddev) | |
1638 | { | |
1639 | struct bitmap *bitmap; | |
1f593903 | 1640 | sector_t blocks = mddev->resync_max_sectors; |
32a7627c N |
1641 | unsigned long chunks; |
1642 | unsigned long pages; | |
c3d9714e | 1643 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1644 | int err; |
6a07997f | 1645 | sector_t start; |
5ff5afff | 1646 | struct sysfs_dirent *bm = NULL; |
32a7627c | 1647 | |
5f6e3c83 | 1648 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1649 | |
c3d9714e | 1650 | if (!file && !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */ |
32a7627c N |
1651 | return 0; |
1652 | ||
c3d9714e | 1653 | BUG_ON(file && mddev->bitmap_info.offset); |
a654b9d8 | 1654 | |
9ffae0cf | 1655 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c N |
1656 | if (!bitmap) |
1657 | return -ENOMEM; | |
1658 | ||
32a7627c | 1659 | spin_lock_init(&bitmap->lock); |
ce25c31b N |
1660 | atomic_set(&bitmap->pending_writes, 0); |
1661 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1662 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1663 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1664 | |
32a7627c | 1665 | bitmap->mddev = mddev; |
32a7627c | 1666 | |
5ff5afff N |
1667 | if (mddev->kobj.sd) |
1668 | bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap"); | |
ece5cff0 | 1669 | if (bm) { |
3ff195b0 | 1670 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear"); |
ece5cff0 N |
1671 | sysfs_put(bm); |
1672 | } else | |
1673 | bitmap->sysfs_can_clear = NULL; | |
1674 | ||
32a7627c | 1675 | bitmap->file = file; |
ce25c31b N |
1676 | if (file) { |
1677 | get_file(file); | |
ae8fa283 N |
1678 | /* As future accesses to this file will use bmap, |
1679 | * and bypass the page cache, we must sync the file | |
1680 | * first. | |
1681 | */ | |
8018ab05 | 1682 | vfs_fsync(file, 1); |
ce25c31b | 1683 | } |
42a04b50 | 1684 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
ece5cff0 N |
1685 | if (!mddev->bitmap_info.external) |
1686 | err = bitmap_read_sb(bitmap); | |
1687 | else { | |
1688 | err = 0; | |
1689 | if (mddev->bitmap_info.chunksize == 0 || | |
1690 | mddev->bitmap_info.daemon_sleep == 0) | |
1691 | /* chunksize and time_base need to be | |
1692 | * set first. */ | |
1693 | err = -EINVAL; | |
1694 | } | |
32a7627c | 1695 | if (err) |
3178b0db | 1696 | goto error; |
32a7627c | 1697 | |
624ce4f5 | 1698 | bitmap->daemon_lastrun = jiffies; |
42a04b50 | 1699 | bitmap->chunkshift = ffz(~mddev->bitmap_info.chunksize); |
32a7627c N |
1700 | |
1701 | /* now that chunksize and chunkshift are set, we can use these macros */ | |
ac2f40be | 1702 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) >> |
1f593903 | 1703 | CHUNK_BLOCK_SHIFT(bitmap); |
ac2f40be | 1704 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
32a7627c N |
1705 | |
1706 | BUG_ON(!pages); | |
1707 | ||
1708 | bitmap->chunks = chunks; | |
1709 | bitmap->pages = pages; | |
1710 | bitmap->missing_pages = pages; | |
1711 | bitmap->counter_bits = COUNTER_BITS; | |
1712 | ||
1713 | bitmap->syncchunk = ~0UL; | |
1714 | ||
44456d37 | 1715 | #ifdef INJECT_FATAL_FAULT_1 |
32a7627c N |
1716 | bitmap->bp = NULL; |
1717 | #else | |
9ffae0cf | 1718 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
32a7627c | 1719 | #endif |
3178b0db | 1720 | err = -ENOMEM; |
32a7627c | 1721 | if (!bitmap->bp) |
3178b0db | 1722 | goto error; |
32a7627c | 1723 | |
32a7627c N |
1724 | /* now that we have some pages available, initialize the in-memory |
1725 | * bitmap from the on-disk bitmap */ | |
6a07997f N |
1726 | start = 0; |
1727 | if (mddev->degraded == 0 | |
1728 | || bitmap->events_cleared == mddev->events) | |
1729 | /* no need to keep dirty bits to optimise a re-add of a missing device */ | |
1730 | start = mddev->recovery_cp; | |
1731 | err = bitmap_init_from_disk(bitmap, start); | |
193f1c93 | 1732 | |
32a7627c | 1733 | if (err) |
3178b0db | 1734 | goto error; |
32a7627c N |
1735 | |
1736 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", | |
1737 | pages, bmname(bitmap)); | |
1738 | ||
3178b0db N |
1739 | mddev->bitmap = bitmap; |
1740 | ||
1b04be96 | 1741 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
9cd30fdc | 1742 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 1743 | |
4ad13663 N |
1744 | bitmap_update_sb(bitmap); |
1745 | ||
1746 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; | |
3178b0db N |
1747 | |
1748 | error: | |
1749 | bitmap_free(bitmap); | |
1750 | return err; | |
32a7627c N |
1751 | } |
1752 | ||
43a70507 N |
1753 | static ssize_t |
1754 | location_show(mddev_t *mddev, char *page) | |
1755 | { | |
1756 | ssize_t len; | |
ac2f40be | 1757 | if (mddev->bitmap_info.file) |
43a70507 | 1758 | len = sprintf(page, "file"); |
ac2f40be | 1759 | else if (mddev->bitmap_info.offset) |
43a70507 | 1760 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 1761 | else |
43a70507 N |
1762 | len = sprintf(page, "none"); |
1763 | len += sprintf(page+len, "\n"); | |
1764 | return len; | |
1765 | } | |
1766 | ||
1767 | static ssize_t | |
1768 | location_store(mddev_t *mddev, const char *buf, size_t len) | |
1769 | { | |
1770 | ||
1771 | if (mddev->pers) { | |
1772 | if (!mddev->pers->quiesce) | |
1773 | return -EBUSY; | |
1774 | if (mddev->recovery || mddev->sync_thread) | |
1775 | return -EBUSY; | |
1776 | } | |
1777 | ||
1778 | if (mddev->bitmap || mddev->bitmap_info.file || | |
1779 | mddev->bitmap_info.offset) { | |
1780 | /* bitmap already configured. Only option is to clear it */ | |
1781 | if (strncmp(buf, "none", 4) != 0) | |
1782 | return -EBUSY; | |
1783 | if (mddev->pers) { | |
1784 | mddev->pers->quiesce(mddev, 1); | |
1785 | bitmap_destroy(mddev); | |
1786 | mddev->pers->quiesce(mddev, 0); | |
1787 | } | |
1788 | mddev->bitmap_info.offset = 0; | |
1789 | if (mddev->bitmap_info.file) { | |
1790 | struct file *f = mddev->bitmap_info.file; | |
1791 | mddev->bitmap_info.file = NULL; | |
1792 | restore_bitmap_write_access(f); | |
1793 | fput(f); | |
1794 | } | |
1795 | } else { | |
1796 | /* No bitmap, OK to set a location */ | |
1797 | long long offset; | |
1798 | if (strncmp(buf, "none", 4) == 0) | |
1799 | /* nothing to be done */; | |
1800 | else if (strncmp(buf, "file:", 5) == 0) { | |
1801 | /* Not supported yet */ | |
1802 | return -EINVAL; | |
1803 | } else { | |
1804 | int rv; | |
1805 | if (buf[0] == '+') | |
1806 | rv = strict_strtoll(buf+1, 10, &offset); | |
1807 | else | |
1808 | rv = strict_strtoll(buf, 10, &offset); | |
1809 | if (rv) | |
1810 | return rv; | |
1811 | if (offset == 0) | |
1812 | return -EINVAL; | |
ece5cff0 N |
1813 | if (mddev->bitmap_info.external == 0 && |
1814 | mddev->major_version == 0 && | |
43a70507 N |
1815 | offset != mddev->bitmap_info.default_offset) |
1816 | return -EINVAL; | |
1817 | mddev->bitmap_info.offset = offset; | |
1818 | if (mddev->pers) { | |
1819 | mddev->pers->quiesce(mddev, 1); | |
1820 | rv = bitmap_create(mddev); | |
1821 | if (rv) { | |
1822 | bitmap_destroy(mddev); | |
1823 | mddev->bitmap_info.offset = 0; | |
1824 | } | |
1825 | mddev->pers->quiesce(mddev, 0); | |
1826 | if (rv) | |
1827 | return rv; | |
1828 | } | |
1829 | } | |
1830 | } | |
1831 | if (!mddev->external) { | |
1832 | /* Ensure new bitmap info is stored in | |
1833 | * metadata promptly. | |
1834 | */ | |
1835 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1836 | md_wakeup_thread(mddev->thread); | |
1837 | } | |
1838 | return len; | |
1839 | } | |
1840 | ||
1841 | static struct md_sysfs_entry bitmap_location = | |
1842 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
1843 | ||
1844 | static ssize_t | |
1845 | timeout_show(mddev_t *mddev, char *page) | |
1846 | { | |
1847 | ssize_t len; | |
1848 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
1849 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 1850 | |
43a70507 N |
1851 | len = sprintf(page, "%lu", secs); |
1852 | if (jifs) | |
1853 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
1854 | len += sprintf(page+len, "\n"); | |
1855 | return len; | |
1856 | } | |
1857 | ||
1858 | static ssize_t | |
1859 | timeout_store(mddev_t *mddev, const char *buf, size_t len) | |
1860 | { | |
1861 | /* timeout can be set at any time */ | |
1862 | unsigned long timeout; | |
1863 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
1864 | if (rv) | |
1865 | return rv; | |
1866 | ||
1867 | /* just to make sure we don't overflow... */ | |
1868 | if (timeout >= LONG_MAX / HZ) | |
1869 | return -EINVAL; | |
1870 | ||
1871 | timeout = timeout * HZ / 10000; | |
1872 | ||
1873 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
1874 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
1875 | if (timeout < 1) | |
1876 | timeout = 1; | |
1877 | mddev->bitmap_info.daemon_sleep = timeout; | |
1878 | if (mddev->thread) { | |
1879 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then | |
1880 | * the bitmap is all clean and we don't need to | |
1881 | * adjust the timeout right now | |
1882 | */ | |
1883 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { | |
1884 | mddev->thread->timeout = timeout; | |
1885 | md_wakeup_thread(mddev->thread); | |
1886 | } | |
1887 | } | |
1888 | return len; | |
1889 | } | |
1890 | ||
1891 | static struct md_sysfs_entry bitmap_timeout = | |
1892 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
1893 | ||
1894 | static ssize_t | |
1895 | backlog_show(mddev_t *mddev, char *page) | |
1896 | { | |
1897 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
1898 | } | |
1899 | ||
1900 | static ssize_t | |
1901 | backlog_store(mddev_t *mddev, const char *buf, size_t len) | |
1902 | { | |
1903 | unsigned long backlog; | |
1904 | int rv = strict_strtoul(buf, 10, &backlog); | |
1905 | if (rv) | |
1906 | return rv; | |
1907 | if (backlog > COUNTER_MAX) | |
1908 | return -EINVAL; | |
1909 | mddev->bitmap_info.max_write_behind = backlog; | |
1910 | return len; | |
1911 | } | |
1912 | ||
1913 | static struct md_sysfs_entry bitmap_backlog = | |
1914 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
1915 | ||
1916 | static ssize_t | |
1917 | chunksize_show(mddev_t *mddev, char *page) | |
1918 | { | |
1919 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
1920 | } | |
1921 | ||
1922 | static ssize_t | |
1923 | chunksize_store(mddev_t *mddev, const char *buf, size_t len) | |
1924 | { | |
1925 | /* Can only be changed when no bitmap is active */ | |
1926 | int rv; | |
1927 | unsigned long csize; | |
1928 | if (mddev->bitmap) | |
1929 | return -EBUSY; | |
1930 | rv = strict_strtoul(buf, 10, &csize); | |
1931 | if (rv) | |
1932 | return rv; | |
1933 | if (csize < 512 || | |
1934 | !is_power_of_2(csize)) | |
1935 | return -EINVAL; | |
1936 | mddev->bitmap_info.chunksize = csize; | |
1937 | return len; | |
1938 | } | |
1939 | ||
1940 | static struct md_sysfs_entry bitmap_chunksize = | |
1941 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
1942 | ||
ece5cff0 N |
1943 | static ssize_t metadata_show(mddev_t *mddev, char *page) |
1944 | { | |
1945 | return sprintf(page, "%s\n", (mddev->bitmap_info.external | |
1946 | ? "external" : "internal")); | |
1947 | } | |
1948 | ||
1949 | static ssize_t metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
1950 | { | |
1951 | if (mddev->bitmap || | |
1952 | mddev->bitmap_info.file || | |
1953 | mddev->bitmap_info.offset) | |
1954 | return -EBUSY; | |
1955 | if (strncmp(buf, "external", 8) == 0) | |
1956 | mddev->bitmap_info.external = 1; | |
1957 | else if (strncmp(buf, "internal", 8) == 0) | |
1958 | mddev->bitmap_info.external = 0; | |
1959 | else | |
1960 | return -EINVAL; | |
1961 | return len; | |
1962 | } | |
1963 | ||
1964 | static struct md_sysfs_entry bitmap_metadata = | |
1965 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
1966 | ||
1967 | static ssize_t can_clear_show(mddev_t *mddev, char *page) | |
1968 | { | |
1969 | int len; | |
1970 | if (mddev->bitmap) | |
1971 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
1972 | "false" : "true")); | |
1973 | else | |
1974 | len = sprintf(page, "\n"); | |
1975 | return len; | |
1976 | } | |
1977 | ||
1978 | static ssize_t can_clear_store(mddev_t *mddev, const char *buf, size_t len) | |
1979 | { | |
1980 | if (mddev->bitmap == NULL) | |
1981 | return -ENOENT; | |
1982 | if (strncmp(buf, "false", 5) == 0) | |
1983 | mddev->bitmap->need_sync = 1; | |
1984 | else if (strncmp(buf, "true", 4) == 0) { | |
1985 | if (mddev->degraded) | |
1986 | return -EBUSY; | |
1987 | mddev->bitmap->need_sync = 0; | |
1988 | } else | |
1989 | return -EINVAL; | |
1990 | return len; | |
1991 | } | |
1992 | ||
1993 | static struct md_sysfs_entry bitmap_can_clear = | |
1994 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
1995 | ||
696fcd53 PC |
1996 | static ssize_t |
1997 | behind_writes_used_show(mddev_t *mddev, char *page) | |
1998 | { | |
1999 | if (mddev->bitmap == NULL) | |
2000 | return sprintf(page, "0\n"); | |
2001 | return sprintf(page, "%lu\n", | |
2002 | mddev->bitmap->behind_writes_used); | |
2003 | } | |
2004 | ||
2005 | static ssize_t | |
2006 | behind_writes_used_reset(mddev_t *mddev, const char *buf, size_t len) | |
2007 | { | |
2008 | if (mddev->bitmap) | |
2009 | mddev->bitmap->behind_writes_used = 0; | |
2010 | return len; | |
2011 | } | |
2012 | ||
2013 | static struct md_sysfs_entry max_backlog_used = | |
2014 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2015 | behind_writes_used_show, behind_writes_used_reset); | |
2016 | ||
43a70507 N |
2017 | static struct attribute *md_bitmap_attrs[] = { |
2018 | &bitmap_location.attr, | |
2019 | &bitmap_timeout.attr, | |
2020 | &bitmap_backlog.attr, | |
2021 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2022 | &bitmap_metadata.attr, |
2023 | &bitmap_can_clear.attr, | |
696fcd53 | 2024 | &max_backlog_used.attr, |
43a70507 N |
2025 | NULL |
2026 | }; | |
2027 | struct attribute_group md_bitmap_group = { | |
2028 | .name = "bitmap", | |
2029 | .attrs = md_bitmap_attrs, | |
2030 | }; | |
2031 |