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Commit | Line | Data |
---|---|---|
32a7627c N |
1 | /* |
2 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 | |
3 | * | |
4 | * bitmap_create - sets up the bitmap structure | |
5 | * bitmap_destroy - destroys the bitmap structure | |
6 | * | |
7 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: | |
8 | * - added disk storage for bitmap | |
9 | * - changes to allow various bitmap chunk sizes | |
32a7627c N |
10 | */ |
11 | ||
12 | /* | |
13 | * Still to do: | |
14 | * | |
15 | * flush after percent set rather than just time based. (maybe both). | |
32a7627c N |
16 | */ |
17 | ||
bff61975 | 18 | #include <linux/blkdev.h> |
32a7627c | 19 | #include <linux/module.h> |
32a7627c N |
20 | #include <linux/errno.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/init.h> | |
32a7627c N |
23 | #include <linux/timer.h> |
24 | #include <linux/sched.h> | |
25 | #include <linux/list.h> | |
26 | #include <linux/file.h> | |
27 | #include <linux/mount.h> | |
28 | #include <linux/buffer_head.h> | |
43b2e5d8 | 29 | #include "md.h" |
ef740c37 | 30 | #include "bitmap.h" |
32a7627c 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 | ||
ccebd4c4 | 212 | target = offset + index * (PAGE_SIZE/512); |
a654b9d8 | 213 | |
2b193363 | 214 | if (sync_page_io(rdev, target, |
e1defc4f | 215 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
ccebd4c4 | 216 | page, READ, true)) { |
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; |
a6ff7e08 | 266 | struct block_device *bdev; |
ab6085c7 | 267 | mddev_t *mddev = bitmap->mddev; |
a654b9d8 | 268 | |
b2d2c4ce | 269 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
ac2f40be N |
270 | int size = PAGE_SIZE; |
271 | loff_t offset = mddev->bitmap_info.offset; | |
a6ff7e08 JB |
272 | |
273 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; | |
274 | ||
ac2f40be N |
275 | if (page->index == bitmap->file_pages-1) |
276 | size = roundup(bitmap->last_page_size, | |
a6ff7e08 | 277 | bdev_logical_block_size(bdev)); |
ac2f40be N |
278 | /* Just make sure we aren't corrupting data or |
279 | * metadata | |
280 | */ | |
281 | if (mddev->external) { | |
282 | /* Bitmap could be anywhere. */ | |
283 | if (rdev->sb_start + offset + (page->index | |
284 | * (PAGE_SIZE/512)) | |
285 | > rdev->data_offset | |
286 | && | |
287 | rdev->sb_start + offset | |
288 | < (rdev->data_offset + mddev->dev_sectors | |
289 | + (PAGE_SIZE/512))) | |
290 | goto bad_alignment; | |
291 | } else if (offset < 0) { | |
292 | /* DATA BITMAP METADATA */ | |
293 | if (offset | |
294 | + (long)(page->index * (PAGE_SIZE/512)) | |
295 | + size/512 > 0) | |
296 | /* bitmap runs in to metadata */ | |
297 | goto bad_alignment; | |
298 | if (rdev->data_offset + mddev->dev_sectors | |
299 | > rdev->sb_start + offset) | |
300 | /* data runs in to bitmap */ | |
301 | goto bad_alignment; | |
302 | } else if (rdev->sb_start < rdev->data_offset) { | |
303 | /* METADATA BITMAP DATA */ | |
304 | if (rdev->sb_start | |
305 | + offset | |
306 | + page->index*(PAGE_SIZE/512) + size/512 | |
307 | > rdev->data_offset) | |
308 | /* bitmap runs in to data */ | |
309 | goto bad_alignment; | |
310 | } else { | |
311 | /* DATA METADATA BITMAP - no problems */ | |
312 | } | |
313 | md_super_write(mddev, rdev, | |
314 | rdev->sb_start + offset | |
315 | + page->index * (PAGE_SIZE/512), | |
316 | size, | |
317 | page); | |
b2d2c4ce | 318 | } |
a654b9d8 N |
319 | |
320 | if (wait) | |
a9701a30 | 321 | md_super_wait(mddev); |
a654b9d8 | 322 | return 0; |
4b80991c N |
323 | |
324 | bad_alignment: | |
4b80991c | 325 | return -EINVAL; |
a654b9d8 N |
326 | } |
327 | ||
4ad13663 | 328 | static void bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 329 | /* |
a654b9d8 | 330 | * write out a page to a file |
32a7627c | 331 | */ |
4ad13663 | 332 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 333 | { |
d785a06a | 334 | struct buffer_head *bh; |
32a7627c | 335 | |
f0d76d70 N |
336 | if (bitmap->file == NULL) { |
337 | switch (write_sb_page(bitmap, page, wait)) { | |
338 | case -EINVAL: | |
339 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
f0d76d70 | 340 | } |
4ad13663 | 341 | } else { |
a654b9d8 | 342 | |
4ad13663 | 343 | bh = page_buffers(page); |
c708443c | 344 | |
4ad13663 N |
345 | while (bh && bh->b_blocknr) { |
346 | atomic_inc(&bitmap->pending_writes); | |
347 | set_buffer_locked(bh); | |
348 | set_buffer_mapped(bh); | |
721a9602 | 349 | submit_bh(WRITE | REQ_SYNC, bh); |
4ad13663 N |
350 | bh = bh->b_this_page; |
351 | } | |
d785a06a | 352 | |
ac2f40be | 353 | if (wait) |
4ad13663 N |
354 | wait_event(bitmap->write_wait, |
355 | atomic_read(&bitmap->pending_writes)==0); | |
8a5e9cf1 | 356 | } |
4ad13663 N |
357 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
358 | bitmap_file_kick(bitmap); | |
d785a06a N |
359 | } |
360 | ||
361 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
362 | { | |
363 | struct bitmap *bitmap = bh->b_private; | |
364 | unsigned long flags; | |
32a7627c | 365 | |
d785a06a N |
366 | if (!uptodate) { |
367 | spin_lock_irqsave(&bitmap->lock, flags); | |
368 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
369 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
32a7627c | 370 | } |
d785a06a N |
371 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
372 | wake_up(&bitmap->write_wait); | |
373 | } | |
32a7627c | 374 | |
d785a06a N |
375 | /* copied from buffer.c */ |
376 | static void | |
377 | __clear_page_buffers(struct page *page) | |
378 | { | |
379 | ClearPagePrivate(page); | |
380 | set_page_private(page, 0); | |
381 | page_cache_release(page); | |
382 | } | |
383 | static void free_buffers(struct page *page) | |
384 | { | |
385 | struct buffer_head *bh = page_buffers(page); | |
77ad4bc7 | 386 | |
d785a06a N |
387 | while (bh) { |
388 | struct buffer_head *next = bh->b_this_page; | |
389 | free_buffer_head(bh); | |
390 | bh = next; | |
77ad4bc7 | 391 | } |
d785a06a N |
392 | __clear_page_buffers(page); |
393 | put_page(page); | |
32a7627c N |
394 | } |
395 | ||
d785a06a N |
396 | /* read a page from a file. |
397 | * We both read the page, and attach buffers to the page to record the | |
398 | * address of each block (using bmap). These addresses will be used | |
399 | * to write the block later, completely bypassing the filesystem. | |
400 | * This usage is similar to how swap files are handled, and allows us | |
401 | * to write to a file with no concerns of memory allocation failing. | |
402 | */ | |
32a7627c | 403 | static struct page *read_page(struct file *file, unsigned long index, |
d785a06a N |
404 | struct bitmap *bitmap, |
405 | unsigned long count) | |
32a7627c | 406 | { |
32a7627c | 407 | struct page *page = NULL; |
c649bb9c | 408 | struct inode *inode = file->f_path.dentry->d_inode; |
d785a06a N |
409 | struct buffer_head *bh; |
410 | sector_t block; | |
32a7627c | 411 | |
ac2f40be | 412 | PRINTK("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
2d1f3b5d | 413 | (unsigned long long)index << PAGE_SHIFT); |
32a7627c | 414 | |
d785a06a N |
415 | page = alloc_page(GFP_KERNEL); |
416 | if (!page) | |
417 | page = ERR_PTR(-ENOMEM); | |
32a7627c N |
418 | if (IS_ERR(page)) |
419 | goto out; | |
d785a06a | 420 | |
d785a06a N |
421 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
422 | if (!bh) { | |
2d1f3b5d | 423 | put_page(page); |
d785a06a | 424 | page = ERR_PTR(-ENOMEM); |
32a7627c N |
425 | goto out; |
426 | } | |
d785a06a N |
427 | attach_page_buffers(page, bh); |
428 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
429 | while (bh) { | |
430 | if (count == 0) | |
431 | bh->b_blocknr = 0; | |
432 | else { | |
433 | bh->b_blocknr = bmap(inode, block); | |
434 | if (bh->b_blocknr == 0) { | |
435 | /* Cannot use this file! */ | |
436 | free_buffers(page); | |
437 | page = ERR_PTR(-EINVAL); | |
438 | goto out; | |
439 | } | |
440 | bh->b_bdev = inode->i_sb->s_bdev; | |
441 | if (count < (1<<inode->i_blkbits)) | |
442 | count = 0; | |
443 | else | |
444 | count -= (1<<inode->i_blkbits); | |
445 | ||
446 | bh->b_end_io = end_bitmap_write; | |
447 | bh->b_private = bitmap; | |
ce25c31b N |
448 | atomic_inc(&bitmap->pending_writes); |
449 | set_buffer_locked(bh); | |
450 | set_buffer_mapped(bh); | |
451 | submit_bh(READ, bh); | |
d785a06a N |
452 | } |
453 | block++; | |
454 | bh = bh->b_this_page; | |
455 | } | |
d785a06a | 456 | page->index = index; |
ce25c31b N |
457 | |
458 | wait_event(bitmap->write_wait, | |
459 | atomic_read(&bitmap->pending_writes)==0); | |
460 | if (bitmap->flags & BITMAP_WRITE_ERROR) { | |
461 | free_buffers(page); | |
462 | page = ERR_PTR(-EIO); | |
463 | } | |
32a7627c N |
464 | out: |
465 | if (IS_ERR(page)) | |
ac2f40be | 466 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %ld\n", |
2d1f3b5d N |
467 | (int)PAGE_SIZE, |
468 | (unsigned long long)index << PAGE_SHIFT, | |
32a7627c N |
469 | PTR_ERR(page)); |
470 | return page; | |
471 | } | |
472 | ||
473 | /* | |
474 | * bitmap file superblock operations | |
475 | */ | |
476 | ||
477 | /* update the event counter and sync the superblock to disk */ | |
4ad13663 | 478 | void bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
479 | { |
480 | bitmap_super_t *sb; | |
481 | unsigned long flags; | |
482 | ||
483 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 484 | return; |
ece5cff0 N |
485 | if (bitmap->mddev->bitmap_info.external) |
486 | return; | |
32a7627c N |
487 | spin_lock_irqsave(&bitmap->lock, flags); |
488 | if (!bitmap->sb_page) { /* no superblock */ | |
489 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 490 | return; |
32a7627c | 491 | } |
32a7627c | 492 | spin_unlock_irqrestore(&bitmap->lock, flags); |
7b92813c | 493 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 494 | sb->events = cpu_to_le64(bitmap->mddev->events); |
8258c532 | 495 | if (bitmap->mddev->events < bitmap->events_cleared) |
a0da84f3 NB |
496 | /* rocking back to read-only */ |
497 | bitmap->events_cleared = bitmap->mddev->events; | |
8258c532 N |
498 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
499 | sb->state = cpu_to_le32(bitmap->flags); | |
43a70507 N |
500 | /* Just in case these have been changed via sysfs: */ |
501 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
502 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
ea03aff9 | 503 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 504 | write_page(bitmap, bitmap->sb_page, 1); |
32a7627c N |
505 | } |
506 | ||
507 | /* print out the bitmap file superblock */ | |
508 | void bitmap_print_sb(struct bitmap *bitmap) | |
509 | { | |
510 | bitmap_super_t *sb; | |
511 | ||
512 | if (!bitmap || !bitmap->sb_page) | |
513 | return; | |
7b92813c | 514 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 515 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
516 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
517 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
518 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
519 | *(__u32 *)(sb->uuid+0), |
520 | *(__u32 *)(sb->uuid+4), | |
521 | *(__u32 *)(sb->uuid+8), | |
522 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 523 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 524 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 525 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 526 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
527 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
528 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
529 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
530 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
531 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 532 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
ea03aff9 | 533 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
534 | } |
535 | ||
9c81075f JB |
536 | /* |
537 | * bitmap_new_disk_sb | |
538 | * @bitmap | |
539 | * | |
540 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb | |
541 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. | |
542 | * This function verifies 'bitmap_info' and populates the on-disk bitmap | |
543 | * structure, which is to be written to disk. | |
544 | * | |
545 | * Returns: 0 on success, -Exxx on error | |
546 | */ | |
547 | static int bitmap_new_disk_sb(struct bitmap *bitmap) | |
548 | { | |
549 | bitmap_super_t *sb; | |
550 | unsigned long chunksize, daemon_sleep, write_behind; | |
551 | int err = -EINVAL; | |
552 | ||
553 | bitmap->sb_page = alloc_page(GFP_KERNEL); | |
554 | if (IS_ERR(bitmap->sb_page)) { | |
555 | err = PTR_ERR(bitmap->sb_page); | |
556 | bitmap->sb_page = NULL; | |
557 | return err; | |
558 | } | |
559 | bitmap->sb_page->index = 0; | |
560 | ||
561 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); | |
562 | ||
563 | sb->magic = cpu_to_le32(BITMAP_MAGIC); | |
564 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); | |
565 | ||
566 | chunksize = bitmap->mddev->bitmap_info.chunksize; | |
567 | BUG_ON(!chunksize); | |
568 | if (!is_power_of_2(chunksize)) { | |
569 | kunmap_atomic(sb, KM_USER0); | |
570 | printk(KERN_ERR "bitmap chunksize not a power of 2\n"); | |
571 | return -EINVAL; | |
572 | } | |
573 | sb->chunksize = cpu_to_le32(chunksize); | |
574 | ||
575 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; | |
576 | if (!daemon_sleep || | |
577 | (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { | |
578 | printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n"); | |
579 | daemon_sleep = 5 * HZ; | |
580 | } | |
581 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); | |
582 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
583 | ||
584 | /* | |
585 | * FIXME: write_behind for RAID1. If not specified, what | |
586 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. | |
587 | */ | |
588 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; | |
589 | if (write_behind > COUNTER_MAX) | |
590 | write_behind = COUNTER_MAX / 2; | |
591 | sb->write_behind = cpu_to_le32(write_behind); | |
592 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
593 | ||
594 | /* keep the array size field of the bitmap superblock up to date */ | |
595 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
596 | ||
597 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); | |
598 | ||
599 | bitmap->flags |= BITMAP_STALE; | |
600 | sb->state |= cpu_to_le32(BITMAP_STALE); | |
601 | bitmap->events_cleared = bitmap->mddev->events; | |
602 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
603 | ||
604 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
605 | sb->version = cpu_to_le32(BITMAP_MAJOR_HOSTENDIAN); | |
606 | ||
607 | kunmap_atomic(sb, KM_USER0); | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
32a7627c N |
612 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
613 | static int bitmap_read_sb(struct bitmap *bitmap) | |
614 | { | |
615 | char *reason = NULL; | |
616 | bitmap_super_t *sb; | |
4b6d287f | 617 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c N |
618 | unsigned long long events; |
619 | int err = -EINVAL; | |
620 | ||
621 | /* page 0 is the superblock, read it... */ | |
f49d5e62 N |
622 | if (bitmap->file) { |
623 | loff_t isize = i_size_read(bitmap->file->f_mapping->host); | |
624 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; | |
625 | ||
626 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes); | |
627 | } else { | |
42a04b50 N |
628 | bitmap->sb_page = read_sb_page(bitmap->mddev, |
629 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
630 | NULL, |
631 | 0, sizeof(bitmap_super_t)); | |
a654b9d8 | 632 | } |
32a7627c N |
633 | if (IS_ERR(bitmap->sb_page)) { |
634 | err = PTR_ERR(bitmap->sb_page); | |
635 | bitmap->sb_page = NULL; | |
636 | return err; | |
637 | } | |
638 | ||
7b92813c | 639 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 640 | |
32a7627c | 641 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 642 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 643 | write_behind = le32_to_cpu(sb->write_behind); |
32a7627c N |
644 | |
645 | /* verify that the bitmap-specific fields are valid */ | |
646 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
647 | reason = "bad magic"; | |
bd926c63 N |
648 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
649 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) | |
32a7627c | 650 | reason = "unrecognized superblock version"; |
1187cf0a | 651 | else if (chunksize < 512) |
7dd5d34c | 652 | reason = "bitmap chunksize too small"; |
d744540c | 653 | else if (!is_power_of_2(chunksize)) |
32a7627c | 654 | reason = "bitmap chunksize not a power of 2"; |
1b04be96 | 655 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 656 | reason = "daemon sleep period out of range"; |
4b6d287f N |
657 | else if (write_behind > COUNTER_MAX) |
658 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
659 | if (reason) { |
660 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
661 | bmname(bitmap), reason); | |
662 | goto out; | |
663 | } | |
664 | ||
665 | /* keep the array size field of the bitmap superblock up to date */ | |
666 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
667 | ||
668 | if (!bitmap->mddev->persistent) | |
669 | goto success; | |
670 | ||
671 | /* | |
672 | * if we have a persistent array superblock, compare the | |
673 | * bitmap's UUID and event counter to the mddev's | |
674 | */ | |
675 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
676 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", | |
677 | bmname(bitmap)); | |
678 | goto out; | |
679 | } | |
680 | events = le64_to_cpu(sb->events); | |
681 | if (events < bitmap->mddev->events) { | |
682 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " | |
683 | "-- forcing full recovery\n", bmname(bitmap), events, | |
684 | (unsigned long long) bitmap->mddev->events); | |
4f2e639a | 685 | sb->state |= cpu_to_le32(BITMAP_STALE); |
32a7627c N |
686 | } |
687 | success: | |
688 | /* assign fields using values from superblock */ | |
42a04b50 N |
689 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
690 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
42a04b50 | 691 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
4f2e639a | 692 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 N |
693 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
694 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
32a7627c | 695 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
8258c532 | 696 | if (bitmap->flags & BITMAP_STALE) |
6a07997f | 697 | bitmap->events_cleared = bitmap->mddev->events; |
32a7627c N |
698 | err = 0; |
699 | out: | |
ea03aff9 | 700 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
701 | if (err) |
702 | bitmap_print_sb(bitmap); | |
703 | return err; | |
704 | } | |
705 | ||
706 | enum bitmap_mask_op { | |
707 | MASK_SET, | |
708 | MASK_UNSET | |
709 | }; | |
710 | ||
4ad13663 N |
711 | /* record the state of the bitmap in the superblock. Return the old value */ |
712 | static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, | |
713 | enum bitmap_mask_op op) | |
32a7627c N |
714 | { |
715 | bitmap_super_t *sb; | |
716 | unsigned long flags; | |
4ad13663 | 717 | int old; |
32a7627c N |
718 | |
719 | spin_lock_irqsave(&bitmap->lock, flags); | |
7e317655 | 720 | if (!bitmap->sb_page) { /* can't set the state */ |
32a7627c | 721 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 722 | return 0; |
32a7627c | 723 | } |
32a7627c | 724 | spin_unlock_irqrestore(&bitmap->lock, flags); |
7b92813c | 725 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
4ad13663 | 726 | old = le32_to_cpu(sb->state) & bits; |
32a7627c | 727 | switch (op) { |
ac2f40be N |
728 | case MASK_SET: |
729 | sb->state |= cpu_to_le32(bits); | |
8258c532 | 730 | bitmap->flags |= bits; |
ac2f40be N |
731 | break; |
732 | case MASK_UNSET: | |
733 | sb->state &= cpu_to_le32(~bits); | |
8258c532 | 734 | bitmap->flags &= ~bits; |
ac2f40be N |
735 | break; |
736 | default: | |
737 | BUG(); | |
32a7627c | 738 | } |
ea03aff9 | 739 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 740 | return old; |
32a7627c N |
741 | } |
742 | ||
743 | /* | |
744 | * general bitmap file operations | |
745 | */ | |
746 | ||
ece5cff0 N |
747 | /* |
748 | * on-disk bitmap: | |
749 | * | |
750 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
751 | * file a page at a time. There's a superblock at the start of the file. | |
752 | */ | |
32a7627c | 753 | /* calculate the index of the page that contains this bit */ |
ece5cff0 | 754 | static inline unsigned long file_page_index(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 755 | { |
ece5cff0 N |
756 | if (!bitmap->mddev->bitmap_info.external) |
757 | chunk += sizeof(bitmap_super_t) << 3; | |
758 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
759 | } |
760 | ||
761 | /* calculate the (bit) offset of this bit within a page */ | |
ece5cff0 | 762 | static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 763 | { |
ece5cff0 N |
764 | if (!bitmap->mddev->bitmap_info.external) |
765 | chunk += sizeof(bitmap_super_t) << 3; | |
766 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
767 | } |
768 | ||
769 | /* | |
770 | * return a pointer to the page in the filemap that contains the given bit | |
771 | * | |
772 | * this lookup is complicated by the fact that the bitmap sb might be exactly | |
773 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page | |
774 | * 0 or page 1 | |
775 | */ | |
776 | static inline struct page *filemap_get_page(struct bitmap *bitmap, | |
3520fa4d | 777 | unsigned long chunk) |
32a7627c | 778 | { |
ac2f40be N |
779 | if (file_page_index(bitmap, chunk) >= bitmap->file_pages) |
780 | return NULL; | |
ece5cff0 N |
781 | return bitmap->filemap[file_page_index(bitmap, chunk) |
782 | - file_page_index(bitmap, 0)]; | |
32a7627c N |
783 | } |
784 | ||
32a7627c N |
785 | static void bitmap_file_unmap(struct bitmap *bitmap) |
786 | { | |
787 | struct page **map, *sb_page; | |
788 | unsigned long *attr; | |
789 | int pages; | |
790 | unsigned long flags; | |
791 | ||
792 | spin_lock_irqsave(&bitmap->lock, flags); | |
793 | map = bitmap->filemap; | |
794 | bitmap->filemap = NULL; | |
795 | attr = bitmap->filemap_attr; | |
796 | bitmap->filemap_attr = NULL; | |
797 | pages = bitmap->file_pages; | |
798 | bitmap->file_pages = 0; | |
799 | sb_page = bitmap->sb_page; | |
800 | bitmap->sb_page = NULL; | |
801 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
802 | ||
803 | while (pages--) | |
ece5cff0 | 804 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 805 | free_buffers(map[pages]); |
32a7627c N |
806 | kfree(map); |
807 | kfree(attr); | |
808 | ||
d785a06a N |
809 | if (sb_page) |
810 | free_buffers(sb_page); | |
32a7627c N |
811 | } |
812 | ||
813 | static void bitmap_file_put(struct bitmap *bitmap) | |
814 | { | |
815 | struct file *file; | |
32a7627c N |
816 | unsigned long flags; |
817 | ||
818 | spin_lock_irqsave(&bitmap->lock, flags); | |
819 | file = bitmap->file; | |
820 | bitmap->file = NULL; | |
821 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
822 | ||
d785a06a N |
823 | if (file) |
824 | wait_event(bitmap->write_wait, | |
825 | atomic_read(&bitmap->pending_writes)==0); | |
32a7627c N |
826 | bitmap_file_unmap(bitmap); |
827 | ||
d785a06a | 828 | if (file) { |
c649bb9c | 829 | struct inode *inode = file->f_path.dentry->d_inode; |
fc0ecff6 | 830 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 831 | fput(file); |
d785a06a | 832 | } |
32a7627c N |
833 | } |
834 | ||
32a7627c N |
835 | /* |
836 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
837 | * then it is no longer reliable, so we stop using it and we mark the file | |
838 | * as failed in the superblock | |
839 | */ | |
840 | static void bitmap_file_kick(struct bitmap *bitmap) | |
841 | { | |
842 | char *path, *ptr = NULL; | |
843 | ||
4ad13663 N |
844 | if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) { |
845 | bitmap_update_sb(bitmap); | |
32a7627c | 846 | |
4ad13663 N |
847 | if (bitmap->file) { |
848 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
849 | if (path) | |
6bcfd601 CH |
850 | ptr = d_path(&bitmap->file->f_path, path, |
851 | PAGE_SIZE); | |
852 | ||
4ad13663 N |
853 | printk(KERN_ALERT |
854 | "%s: kicking failed bitmap file %s from array!\n", | |
6bcfd601 | 855 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
32a7627c | 856 | |
4ad13663 N |
857 | kfree(path); |
858 | } else | |
859 | printk(KERN_ALERT | |
860 | "%s: disabling internal bitmap due to errors\n", | |
861 | bmname(bitmap)); | |
a654b9d8 | 862 | } |
32a7627c N |
863 | |
864 | bitmap_file_put(bitmap); | |
865 | ||
866 | return; | |
867 | } | |
868 | ||
869 | enum bitmap_page_attr { | |
ac2f40be N |
870 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
871 | BITMAP_PAGE_CLEAN = 1, /* there are bits that might need to be cleared */ | |
872 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ | |
32a7627c N |
873 | }; |
874 | ||
875 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, | |
876 | enum bitmap_page_attr attr) | |
877 | { | |
3520fa4d | 878 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
879 | } |
880 | ||
881 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, | |
882 | enum bitmap_page_attr attr) | |
883 | { | |
3520fa4d | 884 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
885 | } |
886 | ||
ec7a3197 N |
887 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
888 | enum bitmap_page_attr attr) | |
32a7627c | 889 | { |
3520fa4d | 890 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
891 | } |
892 | ||
893 | /* | |
894 | * bitmap_file_set_bit -- called before performing a write to the md device | |
895 | * to set (and eventually sync) a particular bit in the bitmap file | |
896 | * | |
897 | * we set the bit immediately, then we record the page number so that | |
898 | * when an unplug occurs, we can flush the dirty pages out to disk | |
899 | */ | |
900 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
901 | { | |
902 | unsigned long bit; | |
3520fa4d | 903 | struct page *page; |
32a7627c N |
904 | void *kaddr; |
905 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); | |
906 | ||
3520fa4d JB |
907 | if (!bitmap->filemap) |
908 | return; | |
32a7627c | 909 | |
3520fa4d JB |
910 | page = filemap_get_page(bitmap, chunk); |
911 | if (!page) | |
912 | return; | |
913 | bit = file_page_offset(bitmap, chunk); | |
32a7627c | 914 | |
3520fa4d JB |
915 | /* set the bit */ |
916 | kaddr = kmap_atomic(page, KM_USER0); | |
917 | if (bitmap->flags & BITMAP_HOSTENDIAN) | |
918 | set_bit(bit, kaddr); | |
919 | else | |
920 | __set_bit_le(bit, kaddr); | |
921 | kunmap_atomic(kaddr, KM_USER0); | |
922 | PRINTK("set file bit %lu page %lu\n", bit, page->index); | |
32a7627c N |
923 | /* record page number so it gets flushed to disk when unplug occurs */ |
924 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); | |
32a7627c N |
925 | } |
926 | ||
927 | /* this gets called when the md device is ready to unplug its underlying | |
928 | * (slave) device queues -- before we let any writes go down, we need to | |
929 | * sync the dirty pages of the bitmap file to disk */ | |
4ad13663 | 930 | void bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 931 | { |
ec7a3197 N |
932 | unsigned long i, flags; |
933 | int dirty, need_write; | |
32a7627c N |
934 | struct page *page; |
935 | int wait = 0; | |
936 | ||
937 | if (!bitmap) | |
4ad13663 | 938 | return; |
32a7627c N |
939 | |
940 | /* look at each page to see if there are any set bits that need to be | |
941 | * flushed out to disk */ | |
942 | for (i = 0; i < bitmap->file_pages; i++) { | |
943 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 944 | if (!bitmap->filemap) { |
32a7627c | 945 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 946 | return; |
32a7627c N |
947 | } |
948 | page = bitmap->filemap[i]; | |
ec7a3197 N |
949 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
950 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
32a7627c N |
951 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
952 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
ec7a3197 | 953 | if (dirty) |
32a7627c N |
954 | wait = 1; |
955 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
956 | ||
ac2f40be | 957 | if (dirty || need_write) |
4ad13663 | 958 | write_page(bitmap, page, 0); |
32a7627c N |
959 | } |
960 | if (wait) { /* if any writes were performed, we need to wait on them */ | |
0b79ccf0 | 961 | if (bitmap->file) |
d785a06a N |
962 | wait_event(bitmap->write_wait, |
963 | atomic_read(&bitmap->pending_writes)==0); | |
0b79ccf0 | 964 | else |
a9701a30 | 965 | md_super_wait(bitmap->mddev); |
32a7627c | 966 | } |
d785a06a N |
967 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
968 | bitmap_file_kick(bitmap); | |
32a7627c | 969 | } |
ac2f40be | 970 | EXPORT_SYMBOL(bitmap_unplug); |
32a7627c | 971 | |
6a07997f | 972 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
973 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
974 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
975 | * memory mapping of the bitmap file | |
976 | * Special cases: | |
977 | * if there's no bitmap file, or if the bitmap file had been | |
978 | * previously kicked from the array, we mark all the bits as | |
979 | * 1's in order to cause a full resync. | |
6a07997f N |
980 | * |
981 | * We ignore all bits for sectors that end earlier than 'start'. | |
982 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 983 | */ |
6a07997f | 984 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c N |
985 | { |
986 | unsigned long i, chunks, index, oldindex, bit; | |
987 | struct page *page = NULL, *oldpage = NULL; | |
988 | unsigned long num_pages, bit_cnt = 0; | |
989 | struct file *file; | |
d785a06a | 990 | unsigned long bytes, offset; |
32a7627c N |
991 | int outofdate; |
992 | int ret = -ENOSPC; | |
ea03aff9 | 993 | void *paddr; |
32a7627c N |
994 | |
995 | chunks = bitmap->chunks; | |
996 | file = bitmap->file; | |
997 | ||
42a04b50 | 998 | BUG_ON(!file && !bitmap->mddev->bitmap_info.offset); |
32a7627c | 999 | |
44456d37 | 1000 | #ifdef INJECT_FAULTS_3 |
32a7627c N |
1001 | outofdate = 1; |
1002 | #else | |
1003 | outofdate = bitmap->flags & BITMAP_STALE; | |
1004 | #endif | |
1005 | if (outofdate) | |
1006 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
1007 | "recovery\n", bmname(bitmap)); | |
1008 | ||
e384e585 | 1009 | bytes = DIV_ROUND_UP(bitmap->chunks, 8); |
ece5cff0 N |
1010 | if (!bitmap->mddev->bitmap_info.external) |
1011 | bytes += sizeof(bitmap_super_t); | |
bc7f77de | 1012 | |
e384e585 | 1013 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); |
bc7f77de | 1014 | |
ece5cff0 | 1015 | if (file && i_size_read(file->f_mapping->host) < bytes) { |
32a7627c N |
1016 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
1017 | bmname(bitmap), | |
1018 | (unsigned long) i_size_read(file->f_mapping->host), | |
ece5cff0 | 1019 | bytes); |
4ad13663 | 1020 | goto err; |
32a7627c | 1021 | } |
bc7f77de N |
1022 | |
1023 | ret = -ENOMEM; | |
1024 | ||
32a7627c | 1025 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
bc7f77de | 1026 | if (!bitmap->filemap) |
4ad13663 | 1027 | goto err; |
32a7627c | 1028 | |
e16b68b6 N |
1029 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
1030 | bitmap->filemap_attr = kzalloc( | |
ac2f40be | 1031 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
e16b68b6 | 1032 | GFP_KERNEL); |
bc7f77de | 1033 | if (!bitmap->filemap_attr) |
4ad13663 | 1034 | goto err; |
32a7627c | 1035 | |
32a7627c N |
1036 | oldindex = ~0L; |
1037 | ||
1038 | for (i = 0; i < chunks; i++) { | |
bd926c63 | 1039 | int b; |
ece5cff0 N |
1040 | index = file_page_index(bitmap, i); |
1041 | bit = file_page_offset(bitmap, i); | |
32a7627c | 1042 | if (index != oldindex) { /* this is a new page, read it in */ |
d785a06a | 1043 | int count; |
32a7627c | 1044 | /* unmap the old page, we're done with it */ |
d785a06a | 1045 | if (index == num_pages-1) |
ece5cff0 | 1046 | count = bytes - index * PAGE_SIZE; |
d785a06a N |
1047 | else |
1048 | count = PAGE_SIZE; | |
ece5cff0 | 1049 | if (index == 0 && bitmap->sb_page) { |
32a7627c N |
1050 | /* |
1051 | * if we're here then the superblock page | |
1052 | * contains some bits (PAGE_SIZE != sizeof sb) | |
1053 | * we've already read it in, so just use it | |
1054 | */ | |
1055 | page = bitmap->sb_page; | |
1056 | offset = sizeof(bitmap_super_t); | |
53845270 | 1057 | if (!file) |
5c04f551 VK |
1058 | page = read_sb_page( |
1059 | bitmap->mddev, | |
1060 | bitmap->mddev->bitmap_info.offset, | |
1061 | page, | |
1062 | index, count); | |
a654b9d8 | 1063 | } else if (file) { |
d785a06a | 1064 | page = read_page(file, index, bitmap, count); |
a654b9d8 N |
1065 | offset = 0; |
1066 | } else { | |
42a04b50 N |
1067 | page = read_sb_page(bitmap->mddev, |
1068 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
1069 | NULL, |
1070 | index, count); | |
32a7627c N |
1071 | offset = 0; |
1072 | } | |
a654b9d8 N |
1073 | if (IS_ERR(page)) { /* read error */ |
1074 | ret = PTR_ERR(page); | |
4ad13663 | 1075 | goto err; |
a654b9d8 N |
1076 | } |
1077 | ||
32a7627c N |
1078 | oldindex = index; |
1079 | oldpage = page; | |
32a7627c | 1080 | |
b74fd282 N |
1081 | bitmap->filemap[bitmap->file_pages++] = page; |
1082 | bitmap->last_page_size = count; | |
1083 | ||
32a7627c N |
1084 | if (outofdate) { |
1085 | /* | |
1086 | * if bitmap is out of date, dirty the | |
ac2f40be | 1087 | * whole page and write it out |
32a7627c | 1088 | */ |
ea03aff9 N |
1089 | paddr = kmap_atomic(page, KM_USER0); |
1090 | memset(paddr + offset, 0xff, | |
6a07997f | 1091 | PAGE_SIZE - offset); |
ea03aff9 | 1092 | kunmap_atomic(paddr, KM_USER0); |
4ad13663 N |
1093 | write_page(bitmap, page, 1); |
1094 | ||
1095 | ret = -EIO; | |
b74fd282 | 1096 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
4ad13663 | 1097 | goto err; |
32a7627c | 1098 | } |
32a7627c | 1099 | } |
ea03aff9 | 1100 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1101 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 1102 | b = test_bit(bit, paddr); |
bd926c63 | 1103 | else |
6b33aff3 | 1104 | b = test_bit_le(bit, paddr); |
ea03aff9 | 1105 | kunmap_atomic(paddr, KM_USER0); |
bd926c63 | 1106 | if (b) { |
32a7627c | 1107 | /* if the disk bit is set, set the memory bit */ |
db305e50 N |
1108 | int needed = ((sector_t)(i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) |
1109 | >= start); | |
1110 | bitmap_set_memory_bits(bitmap, | |
1111 | (sector_t)i << CHUNK_BLOCK_SHIFT(bitmap), | |
1112 | needed); | |
32a7627c | 1113 | bit_cnt++; |
6a07997f | 1114 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
32a7627c | 1115 | } |
32a7627c N |
1116 | } |
1117 | ||
ac2f40be | 1118 | /* everything went OK */ |
32a7627c N |
1119 | ret = 0; |
1120 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); | |
1121 | ||
32a7627c N |
1122 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
1123 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
1124 | md_wakeup_thread(bitmap->mddev->thread); | |
1125 | } | |
1126 | ||
32a7627c | 1127 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
9c81075f JB |
1128 | "read %lu/%lu pages, set %lu of %lu bits\n", |
1129 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, chunks); | |
4ad13663 N |
1130 | |
1131 | return 0; | |
32a7627c | 1132 | |
4ad13663 N |
1133 | err: |
1134 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", | |
1135 | bmname(bitmap), ret); | |
32a7627c N |
1136 | return ret; |
1137 | } | |
1138 | ||
a654b9d8 N |
1139 | void bitmap_write_all(struct bitmap *bitmap) |
1140 | { | |
1141 | /* We don't actually write all bitmap blocks here, | |
1142 | * just flag them as needing to be written | |
1143 | */ | |
ec7a3197 | 1144 | int i; |
a654b9d8 | 1145 | |
ac2f40be | 1146 | for (i = 0; i < bitmap->file_pages; i++) |
ec7a3197 N |
1147 | set_page_attr(bitmap, bitmap->filemap[i], |
1148 | BITMAP_PAGE_NEEDWRITE); | |
a654b9d8 N |
1149 | } |
1150 | ||
32a7627c N |
1151 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
1152 | { | |
1153 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1154 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1155 | bitmap->bp[page].count += inc; | |
32a7627c N |
1156 | bitmap_checkfree(bitmap, page); |
1157 | } | |
1158 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, | |
57dab0bd | 1159 | sector_t offset, sector_t *blocks, |
32a7627c N |
1160 | int create); |
1161 | ||
1162 | /* | |
1163 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1164 | * out to disk | |
1165 | */ | |
1166 | ||
aa5cbd10 | 1167 | void bitmap_daemon_work(mddev_t *mddev) |
32a7627c | 1168 | { |
aa5cbd10 | 1169 | struct bitmap *bitmap; |
aa3163f8 | 1170 | unsigned long j; |
32a7627c N |
1171 | unsigned long flags; |
1172 | struct page *page = NULL, *lastpage = NULL; | |
57dab0bd | 1173 | sector_t blocks; |
ea03aff9 | 1174 | void *paddr; |
32a7627c | 1175 | |
aa5cbd10 N |
1176 | /* Use a mutex to guard daemon_work against |
1177 | * bitmap_destroy. | |
1178 | */ | |
c3d9714e | 1179 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1180 | bitmap = mddev->bitmap; |
1181 | if (bitmap == NULL) { | |
c3d9714e | 1182 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1183 | return; |
aa5cbd10 | 1184 | } |
42a04b50 | 1185 | if (time_before(jiffies, bitmap->daemon_lastrun |
1b04be96 | 1186 | + bitmap->mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1187 | goto done; |
1188 | ||
32a7627c | 1189 | bitmap->daemon_lastrun = jiffies; |
8311c29d N |
1190 | if (bitmap->allclean) { |
1191 | bitmap->mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
aa5cbd10 | 1192 | goto done; |
8311c29d N |
1193 | } |
1194 | bitmap->allclean = 1; | |
32a7627c | 1195 | |
be512691 | 1196 | spin_lock_irqsave(&bitmap->lock, flags); |
32a7627c N |
1197 | for (j = 0; j < bitmap->chunks; j++) { |
1198 | bitmap_counter_t *bmc; | |
3520fa4d JB |
1199 | if (!bitmap->filemap) |
1200 | /* error or shutdown */ | |
1201 | break; | |
1202 | ||
1203 | page = filemap_get_page(bitmap, j); | |
32a7627c N |
1204 | |
1205 | if (page != lastpage) { | |
aa3163f8 | 1206 | /* skip this page unless it's marked as needing cleaning */ |
ec7a3197 N |
1207 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) { |
1208 | int need_write = test_page_attr(bitmap, page, | |
1209 | BITMAP_PAGE_NEEDWRITE); | |
a647e4bc | 1210 | if (need_write) |
aa3163f8 | 1211 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
a647e4bc | 1212 | |
aa3163f8 | 1213 | spin_unlock_irqrestore(&bitmap->lock, flags); |
8311c29d | 1214 | if (need_write) { |
4ad13663 | 1215 | write_page(bitmap, page, 0); |
8311c29d N |
1216 | bitmap->allclean = 0; |
1217 | } | |
be512691 N |
1218 | spin_lock_irqsave(&bitmap->lock, flags); |
1219 | j |= (PAGE_BITS - 1); | |
aa3163f8 N |
1220 | continue; |
1221 | } | |
1222 | ||
32a7627c | 1223 | /* grab the new page, sync and release the old */ |
32a7627c | 1224 | if (lastpage != NULL) { |
ec7a3197 | 1225 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1226 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1227 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
4ad13663 | 1228 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1229 | } else { |
1230 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1231 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1232 | } | |
32a7627c N |
1233 | } else |
1234 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1235 | lastpage = page; | |
a0da84f3 NB |
1236 | |
1237 | /* We are possibly going to clear some bits, so make | |
1238 | * sure that events_cleared is up-to-date. | |
1239 | */ | |
ece5cff0 N |
1240 | if (bitmap->need_sync && |
1241 | bitmap->mddev->bitmap_info.external == 0) { | |
a0da84f3 NB |
1242 | bitmap_super_t *sb; |
1243 | bitmap->need_sync = 0; | |
1244 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); | |
1245 | sb->events_cleared = | |
1246 | cpu_to_le64(bitmap->events_cleared); | |
1247 | kunmap_atomic(sb, KM_USER0); | |
1248 | write_page(bitmap, bitmap->sb_page, 1); | |
1249 | } | |
32a7627c | 1250 | spin_lock_irqsave(&bitmap->lock, flags); |
ece5cff0 N |
1251 | if (!bitmap->need_sync) |
1252 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
32a7627c | 1253 | } |
db305e50 N |
1254 | bmc = bitmap_get_counter(bitmap, |
1255 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
1256 | &blocks, 0); | |
32a7627c | 1257 | if (bmc) { |
8311c29d N |
1258 | if (*bmc) |
1259 | bitmap->allclean = 0; | |
1260 | ||
32a7627c | 1261 | if (*bmc == 2) { |
ac2f40be | 1262 | *bmc = 1; /* maybe clear the bit next time */ |
32a7627c | 1263 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
ece5cff0 | 1264 | } else if (*bmc == 1 && !bitmap->need_sync) { |
32a7627c N |
1265 | /* we can clear the bit */ |
1266 | *bmc = 0; | |
db305e50 N |
1267 | bitmap_count_page(bitmap, |
1268 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
32a7627c N |
1269 | -1); |
1270 | ||
1271 | /* clear the bit */ | |
3520fa4d JB |
1272 | paddr = kmap_atomic(page, KM_USER0); |
1273 | if (bitmap->flags & BITMAP_HOSTENDIAN) | |
1274 | clear_bit(file_page_offset(bitmap, j), | |
1275 | paddr); | |
1276 | else | |
1277 | __clear_bit_le( | |
a0a02a7a AM |
1278 | file_page_offset(bitmap, |
1279 | j), | |
1280 | paddr); | |
3520fa4d | 1281 | kunmap_atomic(paddr, KM_USER0); |
32a7627c | 1282 | } |
be512691 N |
1283 | } else |
1284 | j |= PAGE_COUNTER_MASK; | |
32a7627c | 1285 | } |
be512691 | 1286 | spin_unlock_irqrestore(&bitmap->lock, flags); |
32a7627c N |
1287 | |
1288 | /* now sync the final page */ | |
3520fa4d | 1289 | if (lastpage != NULL) { |
32a7627c | 1290 | spin_lock_irqsave(&bitmap->lock, flags); |
ec7a3197 | 1291 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1292 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1293 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
3520fa4d | 1294 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1295 | } else { |
1296 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1297 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1298 | } | |
32a7627c N |
1299 | } |
1300 | ||
7be3dfec | 1301 | done: |
8311c29d | 1302 | if (bitmap->allclean == 0) |
ac2f40be | 1303 | bitmap->mddev->thread->timeout = |
1b04be96 | 1304 | bitmap->mddev->bitmap_info.daemon_sleep; |
c3d9714e | 1305 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1306 | } |
1307 | ||
32a7627c | 1308 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
57dab0bd | 1309 | sector_t offset, sector_t *blocks, |
32a7627c | 1310 | int create) |
ee305ace N |
1311 | __releases(bitmap->lock) |
1312 | __acquires(bitmap->lock) | |
32a7627c N |
1313 | { |
1314 | /* If 'create', we might release the lock and reclaim it. | |
1315 | * The lock must have been taken with interrupts enabled. | |
1316 | * If !create, we don't release the lock. | |
1317 | */ | |
1318 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1319 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1320 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1321 | sector_t csize; | |
ef425673 | 1322 | int err; |
32a7627c | 1323 | |
ef425673 N |
1324 | err = bitmap_checkpage(bitmap, page, create); |
1325 | ||
1326 | if (bitmap->bp[page].hijacked || | |
1327 | bitmap->bp[page].map == NULL) | |
1328 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + | |
1329 | PAGE_COUNTER_SHIFT - 1); | |
1330 | else | |
32a7627c | 1331 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); |
ef425673 N |
1332 | *blocks = csize - (offset & (csize - 1)); |
1333 | ||
1334 | if (err < 0) | |
32a7627c | 1335 | return NULL; |
ef425673 | 1336 | |
32a7627c N |
1337 | /* now locked ... */ |
1338 | ||
1339 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1340 | /* should we use the first or second counter field | |
1341 | * of the hijacked pointer? */ | |
1342 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
32a7627c N |
1343 | return &((bitmap_counter_t *) |
1344 | &bitmap->bp[page].map)[hi]; | |
ef425673 | 1345 | } else /* page is allocated */ |
32a7627c N |
1346 | return (bitmap_counter_t *) |
1347 | &(bitmap->bp[page].map[pageoff]); | |
32a7627c N |
1348 | } |
1349 | ||
4b6d287f | 1350 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1351 | { |
ac2f40be N |
1352 | if (!bitmap) |
1353 | return 0; | |
4b6d287f N |
1354 | |
1355 | if (behind) { | |
696fcd53 | 1356 | int bw; |
4b6d287f | 1357 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1358 | bw = atomic_read(&bitmap->behind_writes); |
1359 | if (bw > bitmap->behind_writes_used) | |
1360 | bitmap->behind_writes_used = bw; | |
1361 | ||
4b6d287f | 1362 | PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", |
696fcd53 | 1363 | bw, bitmap->max_write_behind); |
4b6d287f N |
1364 | } |
1365 | ||
32a7627c | 1366 | while (sectors) { |
57dab0bd | 1367 | sector_t blocks; |
32a7627c N |
1368 | bitmap_counter_t *bmc; |
1369 | ||
1370 | spin_lock_irq(&bitmap->lock); | |
1371 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); | |
1372 | if (!bmc) { | |
1373 | spin_unlock_irq(&bitmap->lock); | |
1374 | return 0; | |
1375 | } | |
1376 | ||
27d5ea04 | 1377 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
da6e1a32 NB |
1378 | DEFINE_WAIT(__wait); |
1379 | /* note that it is safe to do the prepare_to_wait | |
1380 | * after the test as long as we do it before dropping | |
1381 | * the spinlock. | |
1382 | */ | |
1383 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1384 | TASK_UNINTERRUPTIBLE); | |
1385 | spin_unlock_irq(&bitmap->lock); | |
7eaceacc | 1386 | io_schedule(); |
da6e1a32 NB |
1387 | finish_wait(&bitmap->overflow_wait, &__wait); |
1388 | continue; | |
1389 | } | |
1390 | ||
ac2f40be | 1391 | switch (*bmc) { |
32a7627c N |
1392 | case 0: |
1393 | bitmap_file_set_bit(bitmap, offset); | |
ac2f40be | 1394 | bitmap_count_page(bitmap, offset, 1); |
32a7627c N |
1395 | /* fall through */ |
1396 | case 1: | |
1397 | *bmc = 2; | |
1398 | } | |
da6e1a32 | 1399 | |
32a7627c N |
1400 | (*bmc)++; |
1401 | ||
1402 | spin_unlock_irq(&bitmap->lock); | |
1403 | ||
1404 | offset += blocks; | |
1405 | if (sectors > blocks) | |
1406 | sectors -= blocks; | |
ac2f40be N |
1407 | else |
1408 | sectors = 0; | |
32a7627c | 1409 | } |
8311c29d | 1410 | bitmap->allclean = 0; |
32a7627c N |
1411 | return 0; |
1412 | } | |
ac2f40be | 1413 | EXPORT_SYMBOL(bitmap_startwrite); |
32a7627c N |
1414 | |
1415 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1416 | int success, int behind) |
32a7627c | 1417 | { |
ac2f40be N |
1418 | if (!bitmap) |
1419 | return; | |
4b6d287f | 1420 | if (behind) { |
e555190d N |
1421 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1422 | wake_up(&bitmap->behind_wait); | |
4b6d287f N |
1423 | PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", |
1424 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1425 | } | |
d0a4bb49 N |
1426 | if (bitmap->mddev->degraded) |
1427 | /* Never clear bits or update events_cleared when degraded */ | |
1428 | success = 0; | |
4b6d287f | 1429 | |
32a7627c | 1430 | while (sectors) { |
57dab0bd | 1431 | sector_t blocks; |
32a7627c N |
1432 | unsigned long flags; |
1433 | bitmap_counter_t *bmc; | |
1434 | ||
1435 | spin_lock_irqsave(&bitmap->lock, flags); | |
1436 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); | |
1437 | if (!bmc) { | |
1438 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1439 | return; | |
1440 | } | |
1441 | ||
a0da84f3 NB |
1442 | if (success && |
1443 | bitmap->events_cleared < bitmap->mddev->events) { | |
1444 | bitmap->events_cleared = bitmap->mddev->events; | |
1445 | bitmap->need_sync = 1; | |
5ff5afff | 1446 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1447 | } |
1448 | ||
27d5ea04 | 1449 | if (!success && !NEEDED(*bmc)) |
32a7627c N |
1450 | *bmc |= NEEDED_MASK; |
1451 | ||
27d5ea04 | 1452 | if (COUNTER(*bmc) == COUNTER_MAX) |
da6e1a32 NB |
1453 | wake_up(&bitmap->overflow_wait); |
1454 | ||
32a7627c | 1455 | (*bmc)--; |
ac2f40be | 1456 | if (*bmc <= 2) |
32a7627c | 1457 | set_page_attr(bitmap, |
e384e585 N |
1458 | filemap_get_page( |
1459 | bitmap, | |
1460 | offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
32a7627c | 1461 | BITMAP_PAGE_CLEAN); |
ac2f40be | 1462 | |
32a7627c N |
1463 | spin_unlock_irqrestore(&bitmap->lock, flags); |
1464 | offset += blocks; | |
1465 | if (sectors > blocks) | |
1466 | sectors -= blocks; | |
ac2f40be N |
1467 | else |
1468 | sectors = 0; | |
32a7627c N |
1469 | } |
1470 | } | |
ac2f40be | 1471 | EXPORT_SYMBOL(bitmap_endwrite); |
32a7627c | 1472 | |
57dab0bd | 1473 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a | 1474 | int degraded) |
32a7627c N |
1475 | { |
1476 | bitmap_counter_t *bmc; | |
1477 | int rv; | |
1478 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1479 | *blocks = 1024; | |
1480 | return 1; /* always resync if no bitmap */ | |
1481 | } | |
1482 | spin_lock_irq(&bitmap->lock); | |
1483 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1484 | rv = 0; | |
1485 | if (bmc) { | |
1486 | /* locked */ | |
1487 | if (RESYNC(*bmc)) | |
1488 | rv = 1; | |
1489 | else if (NEEDED(*bmc)) { | |
1490 | rv = 1; | |
6a806c51 N |
1491 | if (!degraded) { /* don't set/clear bits if degraded */ |
1492 | *bmc |= RESYNC_MASK; | |
1493 | *bmc &= ~NEEDED_MASK; | |
1494 | } | |
32a7627c N |
1495 | } |
1496 | } | |
1497 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1498 | bitmap->allclean = 0; |
32a7627c N |
1499 | return rv; |
1500 | } | |
1501 | ||
57dab0bd | 1502 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a N |
1503 | int degraded) |
1504 | { | |
1505 | /* bitmap_start_sync must always report on multiples of whole | |
1506 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1507 | * get confused. | |
1508 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1509 | * At least PAGE_SIZE>>9 blocks are covered. | |
1510 | * Return the 'or' of the result. | |
1511 | */ | |
1512 | int rv = 0; | |
57dab0bd | 1513 | sector_t blocks1; |
1187cf0a N |
1514 | |
1515 | *blocks = 0; | |
1516 | while (*blocks < (PAGE_SIZE>>9)) { | |
1517 | rv |= __bitmap_start_sync(bitmap, offset, | |
1518 | &blocks1, degraded); | |
1519 | offset += blocks1; | |
1520 | *blocks += blocks1; | |
1521 | } | |
1522 | return rv; | |
1523 | } | |
ac2f40be | 1524 | EXPORT_SYMBOL(bitmap_start_sync); |
1187cf0a | 1525 | |
57dab0bd | 1526 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
32a7627c N |
1527 | { |
1528 | bitmap_counter_t *bmc; | |
1529 | unsigned long flags; | |
ac2f40be N |
1530 | |
1531 | if (bitmap == NULL) { | |
32a7627c N |
1532 | *blocks = 1024; |
1533 | return; | |
1534 | } | |
1535 | spin_lock_irqsave(&bitmap->lock, flags); | |
1536 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1537 | if (bmc == NULL) | |
1538 | goto unlock; | |
1539 | /* locked */ | |
32a7627c N |
1540 | if (RESYNC(*bmc)) { |
1541 | *bmc &= ~RESYNC_MASK; | |
1542 | ||
1543 | if (!NEEDED(*bmc) && aborted) | |
1544 | *bmc |= NEEDED_MASK; | |
1545 | else { | |
ac2f40be | 1546 | if (*bmc <= 2) |
32a7627c N |
1547 | set_page_attr(bitmap, |
1548 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1549 | BITMAP_PAGE_CLEAN); | |
32a7627c N |
1550 | } |
1551 | } | |
1552 | unlock: | |
1553 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
8311c29d | 1554 | bitmap->allclean = 0; |
32a7627c | 1555 | } |
ac2f40be | 1556 | EXPORT_SYMBOL(bitmap_end_sync); |
32a7627c N |
1557 | |
1558 | void bitmap_close_sync(struct bitmap *bitmap) | |
1559 | { | |
1560 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1561 | * properly have been aborted. It remains to us to clear the | |
1562 | * RESYNC bit wherever it is still on | |
1563 | */ | |
1564 | sector_t sector = 0; | |
57dab0bd | 1565 | sector_t blocks; |
b47490c9 N |
1566 | if (!bitmap) |
1567 | return; | |
32a7627c N |
1568 | while (sector < bitmap->mddev->resync_max_sectors) { |
1569 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
b47490c9 N |
1570 | sector += blocks; |
1571 | } | |
1572 | } | |
ac2f40be | 1573 | EXPORT_SYMBOL(bitmap_close_sync); |
b47490c9 N |
1574 | |
1575 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) | |
1576 | { | |
1577 | sector_t s = 0; | |
57dab0bd | 1578 | sector_t blocks; |
b47490c9 N |
1579 | |
1580 | if (!bitmap) | |
1581 | return; | |
1582 | if (sector == 0) { | |
1583 | bitmap->last_end_sync = jiffies; | |
1584 | return; | |
1585 | } | |
1586 | if (time_before(jiffies, (bitmap->last_end_sync | |
1b04be96 | 1587 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1588 | return; |
1589 | wait_event(bitmap->mddev->recovery_wait, | |
1590 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1591 | ||
75d3da43 | 1592 | bitmap->mddev->curr_resync_completed = sector; |
070dc6dd | 1593 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
b47490c9 N |
1594 | sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1); |
1595 | s = 0; | |
1596 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
1597 | bitmap_end_sync(bitmap, s, &blocks, 0); | |
1598 | s += blocks; | |
32a7627c | 1599 | } |
b47490c9 | 1600 | bitmap->last_end_sync = jiffies; |
acb180b0 | 1601 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
32a7627c | 1602 | } |
ac2f40be | 1603 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
32a7627c | 1604 | |
6a07997f | 1605 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1606 | { |
1607 | /* For each chunk covered by any of these sectors, set the | |
193f1c93 | 1608 | * counter to 1 and set resync_needed. They should all |
32a7627c N |
1609 | * be 0 at this point |
1610 | */ | |
193f1c93 | 1611 | |
57dab0bd | 1612 | sector_t secs; |
193f1c93 N |
1613 | bitmap_counter_t *bmc; |
1614 | spin_lock_irq(&bitmap->lock); | |
1615 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); | |
1616 | if (!bmc) { | |
32a7627c | 1617 | spin_unlock_irq(&bitmap->lock); |
193f1c93 | 1618 | return; |
32a7627c | 1619 | } |
ac2f40be | 1620 | if (!*bmc) { |
193f1c93 | 1621 | struct page *page; |
ac2f40be | 1622 | *bmc = 1 | (needed ? NEEDED_MASK : 0); |
193f1c93 N |
1623 | bitmap_count_page(bitmap, offset, 1); |
1624 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); | |
1625 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1626 | } | |
1627 | spin_unlock_irq(&bitmap->lock); | |
8311c29d | 1628 | bitmap->allclean = 0; |
32a7627c N |
1629 | } |
1630 | ||
9b1d1dac PC |
1631 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1632 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1633 | { | |
1634 | unsigned long chunk; | |
1635 | ||
1636 | for (chunk = s; chunk <= e; chunk++) { | |
db305e50 | 1637 | sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap); |
9b1d1dac PC |
1638 | bitmap_set_memory_bits(bitmap, sec, 1); |
1639 | bitmap_file_set_bit(bitmap, sec); | |
ffa23322 N |
1640 | if (sec < bitmap->mddev->recovery_cp) |
1641 | /* We are asserting that the array is dirty, | |
1642 | * so move the recovery_cp address back so | |
1643 | * that it is obvious that it is dirty | |
1644 | */ | |
1645 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1646 | } |
1647 | } | |
1648 | ||
6b8b3e8a N |
1649 | /* |
1650 | * flush out any pending updates | |
1651 | */ | |
1652 | void bitmap_flush(mddev_t *mddev) | |
1653 | { | |
1654 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1655 | long sleep; |
6b8b3e8a N |
1656 | |
1657 | if (!bitmap) /* there was no bitmap */ | |
1658 | return; | |
1659 | ||
1660 | /* run the daemon_work three time to ensure everything is flushed | |
1661 | * that can be | |
1662 | */ | |
1b04be96 | 1663 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1664 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1665 | bitmap_daemon_work(mddev); |
42a04b50 | 1666 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1667 | bitmap_daemon_work(mddev); |
42a04b50 | 1668 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1669 | bitmap_daemon_work(mddev); |
6b8b3e8a N |
1670 | bitmap_update_sb(bitmap); |
1671 | } | |
1672 | ||
32a7627c N |
1673 | /* |
1674 | * free memory that was allocated | |
1675 | */ | |
3178b0db | 1676 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1677 | { |
1678 | unsigned long k, pages; | |
1679 | struct bitmap_page *bp; | |
32a7627c N |
1680 | |
1681 | if (!bitmap) /* there was no bitmap */ | |
1682 | return; | |
1683 | ||
32a7627c N |
1684 | /* release the bitmap file and kill the daemon */ |
1685 | bitmap_file_put(bitmap); | |
1686 | ||
1687 | bp = bitmap->bp; | |
1688 | pages = bitmap->pages; | |
1689 | ||
1690 | /* free all allocated memory */ | |
1691 | ||
32a7627c N |
1692 | if (bp) /* deallocate the page memory */ |
1693 | for (k = 0; k < pages; k++) | |
1694 | if (bp[k].map && !bp[k].hijacked) | |
1695 | kfree(bp[k].map); | |
1696 | kfree(bp); | |
1697 | kfree(bitmap); | |
1698 | } | |
aa5cbd10 | 1699 | |
3178b0db N |
1700 | void bitmap_destroy(mddev_t *mddev) |
1701 | { | |
1702 | struct bitmap *bitmap = mddev->bitmap; | |
1703 | ||
1704 | if (!bitmap) /* there was no bitmap */ | |
1705 | return; | |
1706 | ||
c3d9714e | 1707 | mutex_lock(&mddev->bitmap_info.mutex); |
3178b0db | 1708 | mddev->bitmap = NULL; /* disconnect from the md device */ |
c3d9714e | 1709 | mutex_unlock(&mddev->bitmap_info.mutex); |
b15c2e57 N |
1710 | if (mddev->thread) |
1711 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db | 1712 | |
ece5cff0 N |
1713 | if (bitmap->sysfs_can_clear) |
1714 | sysfs_put(bitmap->sysfs_can_clear); | |
1715 | ||
3178b0db N |
1716 | bitmap_free(bitmap); |
1717 | } | |
32a7627c N |
1718 | |
1719 | /* | |
1720 | * initialize the bitmap structure | |
1721 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1722 | */ | |
1723 | int bitmap_create(mddev_t *mddev) | |
1724 | { | |
1725 | struct bitmap *bitmap; | |
1f593903 | 1726 | sector_t blocks = mddev->resync_max_sectors; |
32a7627c N |
1727 | unsigned long chunks; |
1728 | unsigned long pages; | |
c3d9714e | 1729 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1730 | int err; |
5ff5afff | 1731 | struct sysfs_dirent *bm = NULL; |
32a7627c | 1732 | |
5f6e3c83 | 1733 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1734 | |
e384e585 | 1735 | if (!file |
3520fa4d | 1736 | && !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */ |
32a7627c N |
1737 | return 0; |
1738 | ||
c3d9714e | 1739 | BUG_ON(file && mddev->bitmap_info.offset); |
a654b9d8 | 1740 | |
9ffae0cf | 1741 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c N |
1742 | if (!bitmap) |
1743 | return -ENOMEM; | |
1744 | ||
32a7627c | 1745 | spin_lock_init(&bitmap->lock); |
ce25c31b N |
1746 | atomic_set(&bitmap->pending_writes, 0); |
1747 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1748 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1749 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1750 | |
32a7627c | 1751 | bitmap->mddev = mddev; |
32a7627c | 1752 | |
5ff5afff N |
1753 | if (mddev->kobj.sd) |
1754 | bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap"); | |
ece5cff0 | 1755 | if (bm) { |
3ff195b0 | 1756 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear"); |
ece5cff0 N |
1757 | sysfs_put(bm); |
1758 | } else | |
1759 | bitmap->sysfs_can_clear = NULL; | |
1760 | ||
32a7627c | 1761 | bitmap->file = file; |
ce25c31b N |
1762 | if (file) { |
1763 | get_file(file); | |
ae8fa283 N |
1764 | /* As future accesses to this file will use bmap, |
1765 | * and bypass the page cache, we must sync the file | |
1766 | * first. | |
1767 | */ | |
8018ab05 | 1768 | vfs_fsync(file, 1); |
ce25c31b | 1769 | } |
42a04b50 | 1770 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
9c81075f JB |
1771 | if (!mddev->bitmap_info.external) { |
1772 | /* | |
1773 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is | |
1774 | * instructing us to create a new on-disk bitmap instance. | |
1775 | */ | |
1776 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) | |
1777 | err = bitmap_new_disk_sb(bitmap); | |
1778 | else | |
1779 | err = bitmap_read_sb(bitmap); | |
1780 | } else { | |
ece5cff0 N |
1781 | err = 0; |
1782 | if (mddev->bitmap_info.chunksize == 0 || | |
1783 | mddev->bitmap_info.daemon_sleep == 0) | |
1784 | /* chunksize and time_base need to be | |
1785 | * set first. */ | |
1786 | err = -EINVAL; | |
1787 | } | |
32a7627c | 1788 | if (err) |
3178b0db | 1789 | goto error; |
32a7627c | 1790 | |
624ce4f5 | 1791 | bitmap->daemon_lastrun = jiffies; |
42a04b50 | 1792 | bitmap->chunkshift = ffz(~mddev->bitmap_info.chunksize); |
32a7627c N |
1793 | |
1794 | /* now that chunksize and chunkshift are set, we can use these macros */ | |
ac2f40be | 1795 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) >> |
1f593903 | 1796 | CHUNK_BLOCK_SHIFT(bitmap); |
ac2f40be | 1797 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
32a7627c N |
1798 | |
1799 | BUG_ON(!pages); | |
1800 | ||
1801 | bitmap->chunks = chunks; | |
1802 | bitmap->pages = pages; | |
1803 | bitmap->missing_pages = pages; | |
32a7627c | 1804 | |
44456d37 | 1805 | #ifdef INJECT_FATAL_FAULT_1 |
32a7627c N |
1806 | bitmap->bp = NULL; |
1807 | #else | |
9ffae0cf | 1808 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
32a7627c | 1809 | #endif |
3178b0db | 1810 | err = -ENOMEM; |
32a7627c | 1811 | if (!bitmap->bp) |
3178b0db | 1812 | goto error; |
32a7627c | 1813 | |
69e51b44 N |
1814 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
1815 | pages, bmname(bitmap)); | |
1816 | ||
1817 | mddev->bitmap = bitmap; | |
1818 | ||
1819 | ||
1820 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; | |
1821 | ||
1822 | error: | |
1823 | bitmap_free(bitmap); | |
1824 | return err; | |
1825 | } | |
1826 | ||
1827 | int bitmap_load(mddev_t *mddev) | |
1828 | { | |
1829 | int err = 0; | |
3520fa4d | 1830 | sector_t start = 0; |
69e51b44 N |
1831 | sector_t sector = 0; |
1832 | struct bitmap *bitmap = mddev->bitmap; | |
1833 | ||
1834 | if (!bitmap) | |
1835 | goto out; | |
1836 | ||
1837 | /* Clear out old bitmap info first: Either there is none, or we | |
1838 | * are resuming after someone else has possibly changed things, | |
1839 | * so we should forget old cached info. | |
1840 | * All chunks should be clean, but some might need_sync. | |
1841 | */ | |
1842 | while (sector < mddev->resync_max_sectors) { | |
57dab0bd | 1843 | sector_t blocks; |
69e51b44 N |
1844 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
1845 | sector += blocks; | |
1846 | } | |
1847 | bitmap_close_sync(bitmap); | |
1848 | ||
3520fa4d JB |
1849 | if (mddev->degraded == 0 |
1850 | || bitmap->events_cleared == mddev->events) | |
1851 | /* no need to keep dirty bits to optimise a | |
1852 | * re-add of a missing device */ | |
1853 | start = mddev->recovery_cp; | |
1854 | ||
1855 | err = bitmap_init_from_disk(bitmap, start); | |
1856 | ||
32a7627c | 1857 | if (err) |
69e51b44 | 1858 | goto out; |
3178b0db | 1859 | |
1b04be96 | 1860 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
9cd30fdc | 1861 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 1862 | |
4ad13663 N |
1863 | bitmap_update_sb(bitmap); |
1864 | ||
69e51b44 N |
1865 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
1866 | err = -EIO; | |
1867 | out: | |
3178b0db | 1868 | return err; |
32a7627c | 1869 | } |
69e51b44 | 1870 | EXPORT_SYMBOL_GPL(bitmap_load); |
32a7627c | 1871 | |
43a70507 N |
1872 | static ssize_t |
1873 | location_show(mddev_t *mddev, char *page) | |
1874 | { | |
1875 | ssize_t len; | |
ac2f40be | 1876 | if (mddev->bitmap_info.file) |
43a70507 | 1877 | len = sprintf(page, "file"); |
ac2f40be | 1878 | else if (mddev->bitmap_info.offset) |
43a70507 | 1879 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 1880 | else |
43a70507 N |
1881 | len = sprintf(page, "none"); |
1882 | len += sprintf(page+len, "\n"); | |
1883 | return len; | |
1884 | } | |
1885 | ||
1886 | static ssize_t | |
1887 | location_store(mddev_t *mddev, const char *buf, size_t len) | |
1888 | { | |
1889 | ||
1890 | if (mddev->pers) { | |
1891 | if (!mddev->pers->quiesce) | |
1892 | return -EBUSY; | |
1893 | if (mddev->recovery || mddev->sync_thread) | |
1894 | return -EBUSY; | |
1895 | } | |
1896 | ||
1897 | if (mddev->bitmap || mddev->bitmap_info.file || | |
1898 | mddev->bitmap_info.offset) { | |
1899 | /* bitmap already configured. Only option is to clear it */ | |
1900 | if (strncmp(buf, "none", 4) != 0) | |
1901 | return -EBUSY; | |
1902 | if (mddev->pers) { | |
1903 | mddev->pers->quiesce(mddev, 1); | |
1904 | bitmap_destroy(mddev); | |
1905 | mddev->pers->quiesce(mddev, 0); | |
1906 | } | |
1907 | mddev->bitmap_info.offset = 0; | |
1908 | if (mddev->bitmap_info.file) { | |
1909 | struct file *f = mddev->bitmap_info.file; | |
1910 | mddev->bitmap_info.file = NULL; | |
1911 | restore_bitmap_write_access(f); | |
1912 | fput(f); | |
1913 | } | |
1914 | } else { | |
1915 | /* No bitmap, OK to set a location */ | |
1916 | long long offset; | |
1917 | if (strncmp(buf, "none", 4) == 0) | |
1918 | /* nothing to be done */; | |
1919 | else if (strncmp(buf, "file:", 5) == 0) { | |
1920 | /* Not supported yet */ | |
1921 | return -EINVAL; | |
1922 | } else { | |
1923 | int rv; | |
1924 | if (buf[0] == '+') | |
1925 | rv = strict_strtoll(buf+1, 10, &offset); | |
1926 | else | |
1927 | rv = strict_strtoll(buf, 10, &offset); | |
1928 | if (rv) | |
1929 | return rv; | |
1930 | if (offset == 0) | |
1931 | return -EINVAL; | |
ece5cff0 N |
1932 | if (mddev->bitmap_info.external == 0 && |
1933 | mddev->major_version == 0 && | |
43a70507 N |
1934 | offset != mddev->bitmap_info.default_offset) |
1935 | return -EINVAL; | |
1936 | mddev->bitmap_info.offset = offset; | |
1937 | if (mddev->pers) { | |
1938 | mddev->pers->quiesce(mddev, 1); | |
1939 | rv = bitmap_create(mddev); | |
1940 | if (rv) { | |
1941 | bitmap_destroy(mddev); | |
1942 | mddev->bitmap_info.offset = 0; | |
1943 | } | |
1944 | mddev->pers->quiesce(mddev, 0); | |
1945 | if (rv) | |
1946 | return rv; | |
1947 | } | |
1948 | } | |
1949 | } | |
1950 | if (!mddev->external) { | |
1951 | /* Ensure new bitmap info is stored in | |
1952 | * metadata promptly. | |
1953 | */ | |
1954 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1955 | md_wakeup_thread(mddev->thread); | |
1956 | } | |
1957 | return len; | |
1958 | } | |
1959 | ||
1960 | static struct md_sysfs_entry bitmap_location = | |
1961 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
1962 | ||
1963 | static ssize_t | |
1964 | timeout_show(mddev_t *mddev, char *page) | |
1965 | { | |
1966 | ssize_t len; | |
1967 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
1968 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 1969 | |
43a70507 N |
1970 | len = sprintf(page, "%lu", secs); |
1971 | if (jifs) | |
1972 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
1973 | len += sprintf(page+len, "\n"); | |
1974 | return len; | |
1975 | } | |
1976 | ||
1977 | static ssize_t | |
1978 | timeout_store(mddev_t *mddev, const char *buf, size_t len) | |
1979 | { | |
1980 | /* timeout can be set at any time */ | |
1981 | unsigned long timeout; | |
1982 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
1983 | if (rv) | |
1984 | return rv; | |
1985 | ||
1986 | /* just to make sure we don't overflow... */ | |
1987 | if (timeout >= LONG_MAX / HZ) | |
1988 | return -EINVAL; | |
1989 | ||
1990 | timeout = timeout * HZ / 10000; | |
1991 | ||
1992 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
1993 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
1994 | if (timeout < 1) | |
1995 | timeout = 1; | |
1996 | mddev->bitmap_info.daemon_sleep = timeout; | |
1997 | if (mddev->thread) { | |
1998 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then | |
1999 | * the bitmap is all clean and we don't need to | |
2000 | * adjust the timeout right now | |
2001 | */ | |
2002 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { | |
2003 | mddev->thread->timeout = timeout; | |
2004 | md_wakeup_thread(mddev->thread); | |
2005 | } | |
2006 | } | |
2007 | return len; | |
2008 | } | |
2009 | ||
2010 | static struct md_sysfs_entry bitmap_timeout = | |
2011 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
2012 | ||
2013 | static ssize_t | |
2014 | backlog_show(mddev_t *mddev, char *page) | |
2015 | { | |
2016 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
2017 | } | |
2018 | ||
2019 | static ssize_t | |
2020 | backlog_store(mddev_t *mddev, const char *buf, size_t len) | |
2021 | { | |
2022 | unsigned long backlog; | |
2023 | int rv = strict_strtoul(buf, 10, &backlog); | |
2024 | if (rv) | |
2025 | return rv; | |
2026 | if (backlog > COUNTER_MAX) | |
2027 | return -EINVAL; | |
2028 | mddev->bitmap_info.max_write_behind = backlog; | |
2029 | return len; | |
2030 | } | |
2031 | ||
2032 | static struct md_sysfs_entry bitmap_backlog = | |
2033 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
2034 | ||
2035 | static ssize_t | |
2036 | chunksize_show(mddev_t *mddev, char *page) | |
2037 | { | |
2038 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
2039 | } | |
2040 | ||
2041 | static ssize_t | |
2042 | chunksize_store(mddev_t *mddev, const char *buf, size_t len) | |
2043 | { | |
2044 | /* Can only be changed when no bitmap is active */ | |
2045 | int rv; | |
2046 | unsigned long csize; | |
2047 | if (mddev->bitmap) | |
2048 | return -EBUSY; | |
2049 | rv = strict_strtoul(buf, 10, &csize); | |
2050 | if (rv) | |
2051 | return rv; | |
2052 | if (csize < 512 || | |
2053 | !is_power_of_2(csize)) | |
2054 | return -EINVAL; | |
2055 | mddev->bitmap_info.chunksize = csize; | |
2056 | return len; | |
2057 | } | |
2058 | ||
2059 | static struct md_sysfs_entry bitmap_chunksize = | |
2060 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
2061 | ||
ece5cff0 N |
2062 | static ssize_t metadata_show(mddev_t *mddev, char *page) |
2063 | { | |
2064 | return sprintf(page, "%s\n", (mddev->bitmap_info.external | |
2065 | ? "external" : "internal")); | |
2066 | } | |
2067 | ||
2068 | static ssize_t metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2069 | { | |
2070 | if (mddev->bitmap || | |
2071 | mddev->bitmap_info.file || | |
2072 | mddev->bitmap_info.offset) | |
2073 | return -EBUSY; | |
2074 | if (strncmp(buf, "external", 8) == 0) | |
2075 | mddev->bitmap_info.external = 1; | |
2076 | else if (strncmp(buf, "internal", 8) == 0) | |
2077 | mddev->bitmap_info.external = 0; | |
2078 | else | |
2079 | return -EINVAL; | |
2080 | return len; | |
2081 | } | |
2082 | ||
2083 | static struct md_sysfs_entry bitmap_metadata = | |
2084 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
2085 | ||
2086 | static ssize_t can_clear_show(mddev_t *mddev, char *page) | |
2087 | { | |
2088 | int len; | |
2089 | if (mddev->bitmap) | |
2090 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
2091 | "false" : "true")); | |
2092 | else | |
2093 | len = sprintf(page, "\n"); | |
2094 | return len; | |
2095 | } | |
2096 | ||
2097 | static ssize_t can_clear_store(mddev_t *mddev, const char *buf, size_t len) | |
2098 | { | |
2099 | if (mddev->bitmap == NULL) | |
2100 | return -ENOENT; | |
2101 | if (strncmp(buf, "false", 5) == 0) | |
2102 | mddev->bitmap->need_sync = 1; | |
2103 | else if (strncmp(buf, "true", 4) == 0) { | |
2104 | if (mddev->degraded) | |
2105 | return -EBUSY; | |
2106 | mddev->bitmap->need_sync = 0; | |
2107 | } else | |
2108 | return -EINVAL; | |
2109 | return len; | |
2110 | } | |
2111 | ||
2112 | static struct md_sysfs_entry bitmap_can_clear = | |
2113 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
2114 | ||
696fcd53 PC |
2115 | static ssize_t |
2116 | behind_writes_used_show(mddev_t *mddev, char *page) | |
2117 | { | |
2118 | if (mddev->bitmap == NULL) | |
2119 | return sprintf(page, "0\n"); | |
2120 | return sprintf(page, "%lu\n", | |
2121 | mddev->bitmap->behind_writes_used); | |
2122 | } | |
2123 | ||
2124 | static ssize_t | |
2125 | behind_writes_used_reset(mddev_t *mddev, const char *buf, size_t len) | |
2126 | { | |
2127 | if (mddev->bitmap) | |
2128 | mddev->bitmap->behind_writes_used = 0; | |
2129 | return len; | |
2130 | } | |
2131 | ||
2132 | static struct md_sysfs_entry max_backlog_used = | |
2133 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2134 | behind_writes_used_show, behind_writes_used_reset); | |
2135 | ||
43a70507 N |
2136 | static struct attribute *md_bitmap_attrs[] = { |
2137 | &bitmap_location.attr, | |
2138 | &bitmap_timeout.attr, | |
2139 | &bitmap_backlog.attr, | |
2140 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2141 | &bitmap_metadata.attr, |
2142 | &bitmap_can_clear.attr, | |
696fcd53 | 2143 | &max_backlog_used.attr, |
43a70507 N |
2144 | NULL |
2145 | }; | |
2146 | struct attribute_group md_bitmap_group = { | |
2147 | .name = "bitmap", | |
2148 | .attrs = md_bitmap_attrs, | |
2149 | }; | |
2150 |