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> | |
57148964 | 29 | #include <linux/seq_file.h> |
43b2e5d8 | 30 | #include "md.h" |
ef740c37 | 31 | #include "bitmap.h" |
32a7627c | 32 | |
ac2f40be | 33 | static inline char *bmname(struct bitmap *bitmap) |
32a7627c N |
34 | { |
35 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; | |
36 | } | |
37 | ||
32a7627c N |
38 | /* |
39 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) | |
40 | * | |
41 | * 1) check to see if this page is allocated, if it's not then try to alloc | |
42 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the | |
43 | * page pointer directly as a counter | |
44 | * | |
45 | * if we find our page, we increment the page's refcount so that it stays | |
46 | * allocated while we're using it | |
47 | */ | |
ac2f40be N |
48 | static int bitmap_checkpage(struct bitmap *bitmap, |
49 | unsigned long page, int create) | |
ee305ace N |
50 | __releases(bitmap->lock) |
51 | __acquires(bitmap->lock) | |
32a7627c N |
52 | { |
53 | unsigned char *mappage; | |
54 | ||
55 | if (page >= bitmap->pages) { | |
1187cf0a N |
56 | /* This can happen if bitmap_start_sync goes beyond |
57 | * End-of-device while looking for a whole page. | |
58 | * It is harmless. | |
59 | */ | |
32a7627c N |
60 | return -EINVAL; |
61 | } | |
62 | ||
32a7627c N |
63 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
64 | return 0; | |
65 | ||
66 | if (bitmap->bp[page].map) /* page is already allocated, just return */ | |
67 | return 0; | |
68 | ||
69 | if (!create) | |
70 | return -ENOENT; | |
71 | ||
32a7627c N |
72 | /* this page has not been allocated yet */ |
73 | ||
ac2f40be | 74 | spin_unlock_irq(&bitmap->lock); |
792a1d4b | 75 | mappage = kzalloc(PAGE_SIZE, GFP_NOIO); |
ac2f40be N |
76 | spin_lock_irq(&bitmap->lock); |
77 | ||
78 | if (mappage == NULL) { | |
36a4e1fe N |
79 | pr_debug("%s: bitmap map page allocation failed, hijacking\n", |
80 | bmname(bitmap)); | |
32a7627c N |
81 | /* failed - set the hijacked flag so that we can use the |
82 | * pointer as a counter */ | |
32a7627c N |
83 | if (!bitmap->bp[page].map) |
84 | bitmap->bp[page].hijacked = 1; | |
ac2f40be N |
85 | } else if (bitmap->bp[page].map || |
86 | bitmap->bp[page].hijacked) { | |
32a7627c | 87 | /* somebody beat us to getting the page */ |
792a1d4b | 88 | kfree(mappage); |
32a7627c | 89 | return 0; |
ac2f40be | 90 | } else { |
32a7627c | 91 | |
ac2f40be | 92 | /* no page was in place and we have one, so install it */ |
32a7627c | 93 | |
ac2f40be N |
94 | bitmap->bp[page].map = mappage; |
95 | bitmap->missing_pages--; | |
96 | } | |
32a7627c N |
97 | return 0; |
98 | } | |
99 | ||
32a7627c N |
100 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
101 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
102 | /* Note: lock should be held when calling this */ | |
858119e1 | 103 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
32a7627c N |
104 | { |
105 | char *ptr; | |
106 | ||
107 | if (bitmap->bp[page].count) /* page is still busy */ | |
108 | return; | |
109 | ||
110 | /* page is no longer in use, it can be released */ | |
111 | ||
112 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
113 | bitmap->bp[page].hijacked = 0; | |
114 | bitmap->bp[page].map = NULL; | |
ac2f40be N |
115 | } else { |
116 | /* normal case, free the page */ | |
117 | ptr = bitmap->bp[page].map; | |
118 | bitmap->bp[page].map = NULL; | |
119 | bitmap->missing_pages++; | |
792a1d4b | 120 | kfree(ptr); |
32a7627c | 121 | } |
32a7627c N |
122 | } |
123 | ||
32a7627c N |
124 | /* |
125 | * bitmap file handling - read and write the bitmap file and its superblock | |
126 | */ | |
127 | ||
32a7627c N |
128 | /* |
129 | * basic page I/O operations | |
130 | */ | |
131 | ||
a654b9d8 | 132 | /* IO operations when bitmap is stored near all superblocks */ |
fd01b88c | 133 | static struct page *read_sb_page(struct mddev *mddev, loff_t offset, |
a2ed9615 N |
134 | struct page *page, |
135 | unsigned long index, int size) | |
a654b9d8 N |
136 | { |
137 | /* choose a good rdev and read the page from there */ | |
138 | ||
3cb03002 | 139 | struct md_rdev *rdev; |
a654b9d8 | 140 | sector_t target; |
ac2f40be | 141 | int did_alloc = 0; |
a654b9d8 | 142 | |
ac2f40be | 143 | if (!page) { |
a2ed9615 | 144 | page = alloc_page(GFP_KERNEL); |
ac2f40be N |
145 | if (!page) |
146 | return ERR_PTR(-ENOMEM); | |
147 | did_alloc = 1; | |
148 | } | |
a654b9d8 | 149 | |
dafb20fa | 150 | rdev_for_each(rdev, mddev) { |
b2d444d7 N |
151 | if (! test_bit(In_sync, &rdev->flags) |
152 | || test_bit(Faulty, &rdev->flags)) | |
ab904d63 N |
153 | continue; |
154 | ||
ccebd4c4 | 155 | target = offset + index * (PAGE_SIZE/512); |
a654b9d8 | 156 | |
2b193363 | 157 | if (sync_page_io(rdev, target, |
e1defc4f | 158 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
ccebd4c4 | 159 | page, READ, true)) { |
ab904d63 | 160 | page->index = index; |
ce25c31b N |
161 | attach_page_buffers(page, NULL); /* so that free_buffer will |
162 | * quietly no-op */ | |
ab904d63 N |
163 | return page; |
164 | } | |
165 | } | |
ac2f40be N |
166 | if (did_alloc) |
167 | put_page(page); | |
ab904d63 | 168 | return ERR_PTR(-EIO); |
a654b9d8 | 169 | |
a654b9d8 N |
170 | } |
171 | ||
fd01b88c | 172 | static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) |
b2d2c4ce N |
173 | { |
174 | /* Iterate the disks of an mddev, using rcu to protect access to the | |
175 | * linked list, and raising the refcount of devices we return to ensure | |
176 | * they don't disappear while in use. | |
177 | * As devices are only added or removed when raid_disk is < 0 and | |
178 | * nr_pending is 0 and In_sync is clear, the entries we return will | |
179 | * still be in the same position on the list when we re-enter | |
180 | * list_for_each_continue_rcu. | |
181 | */ | |
182 | struct list_head *pos; | |
183 | rcu_read_lock(); | |
184 | if (rdev == NULL) | |
185 | /* start at the beginning */ | |
186 | pos = &mddev->disks; | |
187 | else { | |
188 | /* release the previous rdev and start from there. */ | |
189 | rdev_dec_pending(rdev, mddev); | |
190 | pos = &rdev->same_set; | |
191 | } | |
192 | list_for_each_continue_rcu(pos, &mddev->disks) { | |
3cb03002 | 193 | rdev = list_entry(pos, struct md_rdev, same_set); |
b2d2c4ce | 194 | if (rdev->raid_disk >= 0 && |
b2d2c4ce N |
195 | !test_bit(Faulty, &rdev->flags)) { |
196 | /* this is a usable devices */ | |
197 | atomic_inc(&rdev->nr_pending); | |
198 | rcu_read_unlock(); | |
199 | return rdev; | |
200 | } | |
201 | } | |
202 | rcu_read_unlock(); | |
203 | return NULL; | |
204 | } | |
205 | ||
ab6085c7 | 206 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
a654b9d8 | 207 | { |
3cb03002 | 208 | struct md_rdev *rdev = NULL; |
a6ff7e08 | 209 | struct block_device *bdev; |
fd01b88c | 210 | struct mddev *mddev = bitmap->mddev; |
a654b9d8 | 211 | |
b2d2c4ce | 212 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
ac2f40be N |
213 | int size = PAGE_SIZE; |
214 | loff_t offset = mddev->bitmap_info.offset; | |
a6ff7e08 JB |
215 | |
216 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; | |
217 | ||
ac2f40be N |
218 | if (page->index == bitmap->file_pages-1) |
219 | size = roundup(bitmap->last_page_size, | |
a6ff7e08 | 220 | bdev_logical_block_size(bdev)); |
ac2f40be N |
221 | /* Just make sure we aren't corrupting data or |
222 | * metadata | |
223 | */ | |
224 | if (mddev->external) { | |
225 | /* Bitmap could be anywhere. */ | |
226 | if (rdev->sb_start + offset + (page->index | |
227 | * (PAGE_SIZE/512)) | |
228 | > rdev->data_offset | |
229 | && | |
230 | rdev->sb_start + offset | |
231 | < (rdev->data_offset + mddev->dev_sectors | |
232 | + (PAGE_SIZE/512))) | |
233 | goto bad_alignment; | |
234 | } else if (offset < 0) { | |
235 | /* DATA BITMAP METADATA */ | |
236 | if (offset | |
237 | + (long)(page->index * (PAGE_SIZE/512)) | |
238 | + size/512 > 0) | |
239 | /* bitmap runs in to metadata */ | |
240 | goto bad_alignment; | |
241 | if (rdev->data_offset + mddev->dev_sectors | |
242 | > rdev->sb_start + offset) | |
243 | /* data runs in to bitmap */ | |
244 | goto bad_alignment; | |
245 | } else if (rdev->sb_start < rdev->data_offset) { | |
246 | /* METADATA BITMAP DATA */ | |
247 | if (rdev->sb_start | |
248 | + offset | |
249 | + page->index*(PAGE_SIZE/512) + size/512 | |
250 | > rdev->data_offset) | |
251 | /* bitmap runs in to data */ | |
252 | goto bad_alignment; | |
253 | } else { | |
254 | /* DATA METADATA BITMAP - no problems */ | |
255 | } | |
256 | md_super_write(mddev, rdev, | |
257 | rdev->sb_start + offset | |
258 | + page->index * (PAGE_SIZE/512), | |
259 | size, | |
260 | page); | |
b2d2c4ce | 261 | } |
a654b9d8 N |
262 | |
263 | if (wait) | |
a9701a30 | 264 | md_super_wait(mddev); |
a654b9d8 | 265 | return 0; |
4b80991c N |
266 | |
267 | bad_alignment: | |
4b80991c | 268 | return -EINVAL; |
a654b9d8 N |
269 | } |
270 | ||
4ad13663 | 271 | static void bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 272 | /* |
a654b9d8 | 273 | * write out a page to a file |
32a7627c | 274 | */ |
4ad13663 | 275 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 276 | { |
d785a06a | 277 | struct buffer_head *bh; |
32a7627c | 278 | |
f0d76d70 N |
279 | if (bitmap->file == NULL) { |
280 | switch (write_sb_page(bitmap, page, wait)) { | |
281 | case -EINVAL: | |
282 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
f0d76d70 | 283 | } |
4ad13663 | 284 | } else { |
a654b9d8 | 285 | |
4ad13663 | 286 | bh = page_buffers(page); |
c708443c | 287 | |
4ad13663 N |
288 | while (bh && bh->b_blocknr) { |
289 | atomic_inc(&bitmap->pending_writes); | |
290 | set_buffer_locked(bh); | |
291 | set_buffer_mapped(bh); | |
721a9602 | 292 | submit_bh(WRITE | REQ_SYNC, bh); |
4ad13663 N |
293 | bh = bh->b_this_page; |
294 | } | |
d785a06a | 295 | |
ac2f40be | 296 | if (wait) |
4ad13663 N |
297 | wait_event(bitmap->write_wait, |
298 | atomic_read(&bitmap->pending_writes)==0); | |
8a5e9cf1 | 299 | } |
4ad13663 N |
300 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
301 | bitmap_file_kick(bitmap); | |
d785a06a N |
302 | } |
303 | ||
304 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
305 | { | |
306 | struct bitmap *bitmap = bh->b_private; | |
307 | unsigned long flags; | |
32a7627c | 308 | |
d785a06a N |
309 | if (!uptodate) { |
310 | spin_lock_irqsave(&bitmap->lock, flags); | |
311 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
312 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
32a7627c | 313 | } |
d785a06a N |
314 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
315 | wake_up(&bitmap->write_wait); | |
316 | } | |
32a7627c | 317 | |
d785a06a N |
318 | /* copied from buffer.c */ |
319 | static void | |
320 | __clear_page_buffers(struct page *page) | |
321 | { | |
322 | ClearPagePrivate(page); | |
323 | set_page_private(page, 0); | |
324 | page_cache_release(page); | |
325 | } | |
326 | static void free_buffers(struct page *page) | |
327 | { | |
328 | struct buffer_head *bh = page_buffers(page); | |
77ad4bc7 | 329 | |
d785a06a N |
330 | while (bh) { |
331 | struct buffer_head *next = bh->b_this_page; | |
332 | free_buffer_head(bh); | |
333 | bh = next; | |
77ad4bc7 | 334 | } |
d785a06a N |
335 | __clear_page_buffers(page); |
336 | put_page(page); | |
32a7627c N |
337 | } |
338 | ||
d785a06a N |
339 | /* read a page from a file. |
340 | * We both read the page, and attach buffers to the page to record the | |
341 | * address of each block (using bmap). These addresses will be used | |
342 | * to write the block later, completely bypassing the filesystem. | |
343 | * This usage is similar to how swap files are handled, and allows us | |
344 | * to write to a file with no concerns of memory allocation failing. | |
345 | */ | |
32a7627c | 346 | static struct page *read_page(struct file *file, unsigned long index, |
d785a06a N |
347 | struct bitmap *bitmap, |
348 | unsigned long count) | |
32a7627c | 349 | { |
32a7627c | 350 | struct page *page = NULL; |
c649bb9c | 351 | struct inode *inode = file->f_path.dentry->d_inode; |
d785a06a N |
352 | struct buffer_head *bh; |
353 | sector_t block; | |
32a7627c | 354 | |
36a4e1fe N |
355 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
356 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 357 | |
d785a06a N |
358 | page = alloc_page(GFP_KERNEL); |
359 | if (!page) | |
360 | page = ERR_PTR(-ENOMEM); | |
32a7627c N |
361 | if (IS_ERR(page)) |
362 | goto out; | |
d785a06a | 363 | |
d785a06a N |
364 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
365 | if (!bh) { | |
2d1f3b5d | 366 | put_page(page); |
d785a06a | 367 | page = ERR_PTR(-ENOMEM); |
32a7627c N |
368 | goto out; |
369 | } | |
d785a06a N |
370 | attach_page_buffers(page, bh); |
371 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
372 | while (bh) { | |
373 | if (count == 0) | |
374 | bh->b_blocknr = 0; | |
375 | else { | |
376 | bh->b_blocknr = bmap(inode, block); | |
377 | if (bh->b_blocknr == 0) { | |
378 | /* Cannot use this file! */ | |
379 | free_buffers(page); | |
380 | page = ERR_PTR(-EINVAL); | |
381 | goto out; | |
382 | } | |
383 | bh->b_bdev = inode->i_sb->s_bdev; | |
384 | if (count < (1<<inode->i_blkbits)) | |
385 | count = 0; | |
386 | else | |
387 | count -= (1<<inode->i_blkbits); | |
388 | ||
389 | bh->b_end_io = end_bitmap_write; | |
390 | bh->b_private = bitmap; | |
ce25c31b N |
391 | atomic_inc(&bitmap->pending_writes); |
392 | set_buffer_locked(bh); | |
393 | set_buffer_mapped(bh); | |
394 | submit_bh(READ, bh); | |
d785a06a N |
395 | } |
396 | block++; | |
397 | bh = bh->b_this_page; | |
398 | } | |
d785a06a | 399 | page->index = index; |
ce25c31b N |
400 | |
401 | wait_event(bitmap->write_wait, | |
402 | atomic_read(&bitmap->pending_writes)==0); | |
403 | if (bitmap->flags & BITMAP_WRITE_ERROR) { | |
404 | free_buffers(page); | |
405 | page = ERR_PTR(-EIO); | |
406 | } | |
32a7627c N |
407 | out: |
408 | if (IS_ERR(page)) | |
ac2f40be | 409 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %ld\n", |
2d1f3b5d N |
410 | (int)PAGE_SIZE, |
411 | (unsigned long long)index << PAGE_SHIFT, | |
32a7627c N |
412 | PTR_ERR(page)); |
413 | return page; | |
414 | } | |
415 | ||
416 | /* | |
417 | * bitmap file superblock operations | |
418 | */ | |
419 | ||
420 | /* update the event counter and sync the superblock to disk */ | |
4ad13663 | 421 | void bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
422 | { |
423 | bitmap_super_t *sb; | |
32a7627c N |
424 | |
425 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 426 | return; |
ece5cff0 N |
427 | if (bitmap->mddev->bitmap_info.external) |
428 | return; | |
5a6c824e | 429 | if (!bitmap->sb_page) /* no superblock */ |
4ad13663 | 430 | return; |
7b92813c | 431 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 432 | sb->events = cpu_to_le64(bitmap->mddev->events); |
8258c532 | 433 | if (bitmap->mddev->events < bitmap->events_cleared) |
a0da84f3 NB |
434 | /* rocking back to read-only */ |
435 | bitmap->events_cleared = bitmap->mddev->events; | |
8258c532 N |
436 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
437 | sb->state = cpu_to_le32(bitmap->flags); | |
43a70507 N |
438 | /* Just in case these have been changed via sysfs: */ |
439 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
440 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
ea03aff9 | 441 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 442 | write_page(bitmap, bitmap->sb_page, 1); |
32a7627c N |
443 | } |
444 | ||
445 | /* print out the bitmap file superblock */ | |
446 | void bitmap_print_sb(struct bitmap *bitmap) | |
447 | { | |
448 | bitmap_super_t *sb; | |
449 | ||
450 | if (!bitmap || !bitmap->sb_page) | |
451 | return; | |
7b92813c | 452 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 453 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
454 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
455 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
456 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
457 | *(__u32 *)(sb->uuid+0), |
458 | *(__u32 *)(sb->uuid+4), | |
459 | *(__u32 *)(sb->uuid+8), | |
460 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 461 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 462 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 463 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 464 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
465 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
466 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
467 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
468 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
469 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 470 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
ea03aff9 | 471 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
472 | } |
473 | ||
9c81075f JB |
474 | /* |
475 | * bitmap_new_disk_sb | |
476 | * @bitmap | |
477 | * | |
478 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb | |
479 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. | |
480 | * This function verifies 'bitmap_info' and populates the on-disk bitmap | |
481 | * structure, which is to be written to disk. | |
482 | * | |
483 | * Returns: 0 on success, -Exxx on error | |
484 | */ | |
485 | static int bitmap_new_disk_sb(struct bitmap *bitmap) | |
486 | { | |
487 | bitmap_super_t *sb; | |
488 | unsigned long chunksize, daemon_sleep, write_behind; | |
489 | int err = -EINVAL; | |
490 | ||
491 | bitmap->sb_page = alloc_page(GFP_KERNEL); | |
492 | if (IS_ERR(bitmap->sb_page)) { | |
493 | err = PTR_ERR(bitmap->sb_page); | |
494 | bitmap->sb_page = NULL; | |
495 | return err; | |
496 | } | |
497 | bitmap->sb_page->index = 0; | |
498 | ||
499 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); | |
500 | ||
501 | sb->magic = cpu_to_le32(BITMAP_MAGIC); | |
502 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); | |
503 | ||
504 | chunksize = bitmap->mddev->bitmap_info.chunksize; | |
505 | BUG_ON(!chunksize); | |
506 | if (!is_power_of_2(chunksize)) { | |
507 | kunmap_atomic(sb, KM_USER0); | |
508 | printk(KERN_ERR "bitmap chunksize not a power of 2\n"); | |
509 | return -EINVAL; | |
510 | } | |
511 | sb->chunksize = cpu_to_le32(chunksize); | |
512 | ||
513 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; | |
514 | if (!daemon_sleep || | |
515 | (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { | |
516 | printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n"); | |
517 | daemon_sleep = 5 * HZ; | |
518 | } | |
519 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); | |
520 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
521 | ||
522 | /* | |
523 | * FIXME: write_behind for RAID1. If not specified, what | |
524 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. | |
525 | */ | |
526 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; | |
527 | if (write_behind > COUNTER_MAX) | |
528 | write_behind = COUNTER_MAX / 2; | |
529 | sb->write_behind = cpu_to_le32(write_behind); | |
530 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
531 | ||
532 | /* keep the array size field of the bitmap superblock up to date */ | |
533 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
534 | ||
535 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); | |
536 | ||
537 | bitmap->flags |= BITMAP_STALE; | |
538 | sb->state |= cpu_to_le32(BITMAP_STALE); | |
539 | bitmap->events_cleared = bitmap->mddev->events; | |
540 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
541 | ||
542 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
543 | sb->version = cpu_to_le32(BITMAP_MAJOR_HOSTENDIAN); | |
544 | ||
545 | kunmap_atomic(sb, KM_USER0); | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
32a7627c N |
550 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
551 | static int bitmap_read_sb(struct bitmap *bitmap) | |
552 | { | |
553 | char *reason = NULL; | |
554 | bitmap_super_t *sb; | |
4b6d287f | 555 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c N |
556 | unsigned long long events; |
557 | int err = -EINVAL; | |
558 | ||
559 | /* page 0 is the superblock, read it... */ | |
f49d5e62 N |
560 | if (bitmap->file) { |
561 | loff_t isize = i_size_read(bitmap->file->f_mapping->host); | |
562 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; | |
563 | ||
564 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes); | |
565 | } else { | |
42a04b50 N |
566 | bitmap->sb_page = read_sb_page(bitmap->mddev, |
567 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
568 | NULL, |
569 | 0, sizeof(bitmap_super_t)); | |
a654b9d8 | 570 | } |
32a7627c N |
571 | if (IS_ERR(bitmap->sb_page)) { |
572 | err = PTR_ERR(bitmap->sb_page); | |
573 | bitmap->sb_page = NULL; | |
574 | return err; | |
575 | } | |
576 | ||
7b92813c | 577 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 578 | |
32a7627c | 579 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 580 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 581 | write_behind = le32_to_cpu(sb->write_behind); |
32a7627c N |
582 | |
583 | /* verify that the bitmap-specific fields are valid */ | |
584 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
585 | reason = "bad magic"; | |
bd926c63 N |
586 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
587 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) | |
32a7627c | 588 | reason = "unrecognized superblock version"; |
1187cf0a | 589 | else if (chunksize < 512) |
7dd5d34c | 590 | reason = "bitmap chunksize too small"; |
d744540c | 591 | else if (!is_power_of_2(chunksize)) |
32a7627c | 592 | reason = "bitmap chunksize not a power of 2"; |
1b04be96 | 593 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 594 | reason = "daemon sleep period out of range"; |
4b6d287f N |
595 | else if (write_behind > COUNTER_MAX) |
596 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
597 | if (reason) { |
598 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
599 | bmname(bitmap), reason); | |
600 | goto out; | |
601 | } | |
602 | ||
603 | /* keep the array size field of the bitmap superblock up to date */ | |
604 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
605 | ||
278c1ca2 N |
606 | if (bitmap->mddev->persistent) { |
607 | /* | |
608 | * We have a persistent array superblock, so compare the | |
609 | * bitmap's UUID and event counter to the mddev's | |
610 | */ | |
611 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
612 | printk(KERN_INFO | |
613 | "%s: bitmap superblock UUID mismatch\n", | |
614 | bmname(bitmap)); | |
615 | goto out; | |
616 | } | |
617 | events = le64_to_cpu(sb->events); | |
618 | if (events < bitmap->mddev->events) { | |
619 | printk(KERN_INFO | |
620 | "%s: bitmap file is out of date (%llu < %llu) " | |
621 | "-- forcing full recovery\n", | |
622 | bmname(bitmap), events, | |
623 | (unsigned long long) bitmap->mddev->events); | |
624 | sb->state |= cpu_to_le32(BITMAP_STALE); | |
625 | } | |
32a7627c | 626 | } |
278c1ca2 | 627 | |
32a7627c | 628 | /* assign fields using values from superblock */ |
42a04b50 N |
629 | bitmap->mddev->bitmap_info.chunksize = chunksize; |
630 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
42a04b50 | 631 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; |
4f2e639a | 632 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 N |
633 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
634 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
32a7627c | 635 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
8258c532 | 636 | if (bitmap->flags & BITMAP_STALE) |
6a07997f | 637 | bitmap->events_cleared = bitmap->mddev->events; |
32a7627c N |
638 | err = 0; |
639 | out: | |
ea03aff9 | 640 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
641 | if (err) |
642 | bitmap_print_sb(bitmap); | |
643 | return err; | |
644 | } | |
645 | ||
646 | enum bitmap_mask_op { | |
647 | MASK_SET, | |
648 | MASK_UNSET | |
649 | }; | |
650 | ||
4ad13663 N |
651 | /* record the state of the bitmap in the superblock. Return the old value */ |
652 | static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, | |
653 | enum bitmap_mask_op op) | |
32a7627c N |
654 | { |
655 | bitmap_super_t *sb; | |
4ad13663 | 656 | int old; |
32a7627c | 657 | |
5a6c824e | 658 | if (!bitmap->sb_page) /* can't set the state */ |
4ad13663 | 659 | return 0; |
7b92813c | 660 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); |
4ad13663 | 661 | old = le32_to_cpu(sb->state) & bits; |
32a7627c | 662 | switch (op) { |
ac2f40be N |
663 | case MASK_SET: |
664 | sb->state |= cpu_to_le32(bits); | |
8258c532 | 665 | bitmap->flags |= bits; |
ac2f40be N |
666 | break; |
667 | case MASK_UNSET: | |
668 | sb->state &= cpu_to_le32(~bits); | |
8258c532 | 669 | bitmap->flags &= ~bits; |
ac2f40be N |
670 | break; |
671 | default: | |
672 | BUG(); | |
32a7627c | 673 | } |
ea03aff9 | 674 | kunmap_atomic(sb, KM_USER0); |
4ad13663 | 675 | return old; |
32a7627c N |
676 | } |
677 | ||
678 | /* | |
679 | * general bitmap file operations | |
680 | */ | |
681 | ||
ece5cff0 N |
682 | /* |
683 | * on-disk bitmap: | |
684 | * | |
685 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
686 | * file a page at a time. There's a superblock at the start of the file. | |
687 | */ | |
32a7627c | 688 | /* calculate the index of the page that contains this bit */ |
ece5cff0 | 689 | static inline unsigned long file_page_index(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 690 | { |
ece5cff0 N |
691 | if (!bitmap->mddev->bitmap_info.external) |
692 | chunk += sizeof(bitmap_super_t) << 3; | |
693 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
694 | } |
695 | ||
696 | /* calculate the (bit) offset of this bit within a page */ | |
ece5cff0 | 697 | static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned long chunk) |
32a7627c | 698 | { |
ece5cff0 N |
699 | if (!bitmap->mddev->bitmap_info.external) |
700 | chunk += sizeof(bitmap_super_t) << 3; | |
701 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
702 | } |
703 | ||
704 | /* | |
705 | * return a pointer to the page in the filemap that contains the given bit | |
706 | * | |
707 | * this lookup is complicated by the fact that the bitmap sb might be exactly | |
708 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page | |
709 | * 0 or page 1 | |
710 | */ | |
711 | static inline struct page *filemap_get_page(struct bitmap *bitmap, | |
3520fa4d | 712 | unsigned long chunk) |
32a7627c | 713 | { |
ac2f40be N |
714 | if (file_page_index(bitmap, chunk) >= bitmap->file_pages) |
715 | return NULL; | |
ece5cff0 N |
716 | return bitmap->filemap[file_page_index(bitmap, chunk) |
717 | - file_page_index(bitmap, 0)]; | |
32a7627c N |
718 | } |
719 | ||
32a7627c N |
720 | static void bitmap_file_unmap(struct bitmap *bitmap) |
721 | { | |
722 | struct page **map, *sb_page; | |
723 | unsigned long *attr; | |
724 | int pages; | |
725 | unsigned long flags; | |
726 | ||
727 | spin_lock_irqsave(&bitmap->lock, flags); | |
728 | map = bitmap->filemap; | |
729 | bitmap->filemap = NULL; | |
730 | attr = bitmap->filemap_attr; | |
731 | bitmap->filemap_attr = NULL; | |
732 | pages = bitmap->file_pages; | |
733 | bitmap->file_pages = 0; | |
734 | sb_page = bitmap->sb_page; | |
735 | bitmap->sb_page = NULL; | |
736 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
737 | ||
738 | while (pages--) | |
ece5cff0 | 739 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 740 | free_buffers(map[pages]); |
32a7627c N |
741 | kfree(map); |
742 | kfree(attr); | |
743 | ||
d785a06a N |
744 | if (sb_page) |
745 | free_buffers(sb_page); | |
32a7627c N |
746 | } |
747 | ||
748 | static void bitmap_file_put(struct bitmap *bitmap) | |
749 | { | |
750 | struct file *file; | |
32a7627c N |
751 | unsigned long flags; |
752 | ||
753 | spin_lock_irqsave(&bitmap->lock, flags); | |
754 | file = bitmap->file; | |
755 | bitmap->file = NULL; | |
756 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
757 | ||
d785a06a N |
758 | if (file) |
759 | wait_event(bitmap->write_wait, | |
760 | atomic_read(&bitmap->pending_writes)==0); | |
32a7627c N |
761 | bitmap_file_unmap(bitmap); |
762 | ||
d785a06a | 763 | if (file) { |
c649bb9c | 764 | struct inode *inode = file->f_path.dentry->d_inode; |
fc0ecff6 | 765 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 766 | fput(file); |
d785a06a | 767 | } |
32a7627c N |
768 | } |
769 | ||
32a7627c N |
770 | /* |
771 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
772 | * then it is no longer reliable, so we stop using it and we mark the file | |
773 | * as failed in the superblock | |
774 | */ | |
775 | static void bitmap_file_kick(struct bitmap *bitmap) | |
776 | { | |
777 | char *path, *ptr = NULL; | |
778 | ||
4ad13663 N |
779 | if (bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET) == 0) { |
780 | bitmap_update_sb(bitmap); | |
32a7627c | 781 | |
4ad13663 N |
782 | if (bitmap->file) { |
783 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
784 | if (path) | |
6bcfd601 CH |
785 | ptr = d_path(&bitmap->file->f_path, path, |
786 | PAGE_SIZE); | |
787 | ||
4ad13663 N |
788 | printk(KERN_ALERT |
789 | "%s: kicking failed bitmap file %s from array!\n", | |
6bcfd601 | 790 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
32a7627c | 791 | |
4ad13663 N |
792 | kfree(path); |
793 | } else | |
794 | printk(KERN_ALERT | |
795 | "%s: disabling internal bitmap due to errors\n", | |
796 | bmname(bitmap)); | |
a654b9d8 | 797 | } |
32a7627c N |
798 | |
799 | bitmap_file_put(bitmap); | |
800 | ||
801 | return; | |
802 | } | |
803 | ||
804 | enum bitmap_page_attr { | |
ac2f40be | 805 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
5a537df4 N |
806 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
807 | * i.e. counter is 1 or 2. */ | |
ac2f40be | 808 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
32a7627c N |
809 | }; |
810 | ||
811 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, | |
812 | enum bitmap_page_attr attr) | |
813 | { | |
3520fa4d | 814 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
815 | } |
816 | ||
817 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, | |
818 | enum bitmap_page_attr attr) | |
819 | { | |
3520fa4d | 820 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
821 | } |
822 | ||
ec7a3197 N |
823 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
824 | enum bitmap_page_attr attr) | |
32a7627c | 825 | { |
3520fa4d | 826 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
827 | } |
828 | ||
829 | /* | |
830 | * bitmap_file_set_bit -- called before performing a write to the md device | |
831 | * to set (and eventually sync) a particular bit in the bitmap file | |
832 | * | |
833 | * we set the bit immediately, then we record the page number so that | |
834 | * when an unplug occurs, we can flush the dirty pages out to disk | |
835 | */ | |
836 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
837 | { | |
838 | unsigned long bit; | |
3520fa4d | 839 | struct page *page; |
32a7627c N |
840 | void *kaddr; |
841 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); | |
842 | ||
3520fa4d JB |
843 | if (!bitmap->filemap) |
844 | return; | |
32a7627c | 845 | |
3520fa4d JB |
846 | page = filemap_get_page(bitmap, chunk); |
847 | if (!page) | |
848 | return; | |
849 | bit = file_page_offset(bitmap, chunk); | |
32a7627c | 850 | |
3520fa4d JB |
851 | /* set the bit */ |
852 | kaddr = kmap_atomic(page, KM_USER0); | |
853 | if (bitmap->flags & BITMAP_HOSTENDIAN) | |
854 | set_bit(bit, kaddr); | |
855 | else | |
856 | __set_bit_le(bit, kaddr); | |
857 | kunmap_atomic(kaddr, KM_USER0); | |
36a4e1fe | 858 | pr_debug("set file bit %lu page %lu\n", bit, page->index); |
32a7627c N |
859 | /* record page number so it gets flushed to disk when unplug occurs */ |
860 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); | |
32a7627c N |
861 | } |
862 | ||
863 | /* this gets called when the md device is ready to unplug its underlying | |
864 | * (slave) device queues -- before we let any writes go down, we need to | |
865 | * sync the dirty pages of the bitmap file to disk */ | |
4ad13663 | 866 | void bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 867 | { |
ec7a3197 N |
868 | unsigned long i, flags; |
869 | int dirty, need_write; | |
32a7627c N |
870 | struct page *page; |
871 | int wait = 0; | |
872 | ||
873 | if (!bitmap) | |
4ad13663 | 874 | return; |
32a7627c N |
875 | |
876 | /* look at each page to see if there are any set bits that need to be | |
877 | * flushed out to disk */ | |
878 | for (i = 0; i < bitmap->file_pages; i++) { | |
879 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 880 | if (!bitmap->filemap) { |
32a7627c | 881 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 882 | return; |
32a7627c N |
883 | } |
884 | page = bitmap->filemap[i]; | |
ec7a3197 N |
885 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
886 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
32a7627c N |
887 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
888 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
ec7a3197 | 889 | if (dirty) |
32a7627c N |
890 | wait = 1; |
891 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
892 | ||
ac2f40be | 893 | if (dirty || need_write) |
4ad13663 | 894 | write_page(bitmap, page, 0); |
32a7627c N |
895 | } |
896 | if (wait) { /* if any writes were performed, we need to wait on them */ | |
0b79ccf0 | 897 | if (bitmap->file) |
d785a06a N |
898 | wait_event(bitmap->write_wait, |
899 | atomic_read(&bitmap->pending_writes)==0); | |
0b79ccf0 | 900 | else |
a9701a30 | 901 | md_super_wait(bitmap->mddev); |
32a7627c | 902 | } |
d785a06a N |
903 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
904 | bitmap_file_kick(bitmap); | |
32a7627c | 905 | } |
ac2f40be | 906 | EXPORT_SYMBOL(bitmap_unplug); |
32a7627c | 907 | |
6a07997f | 908 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
909 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
910 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
911 | * memory mapping of the bitmap file | |
912 | * Special cases: | |
913 | * if there's no bitmap file, or if the bitmap file had been | |
914 | * previously kicked from the array, we mark all the bits as | |
915 | * 1's in order to cause a full resync. | |
6a07997f N |
916 | * |
917 | * We ignore all bits for sectors that end earlier than 'start'. | |
918 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 919 | */ |
6a07997f | 920 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c N |
921 | { |
922 | unsigned long i, chunks, index, oldindex, bit; | |
923 | struct page *page = NULL, *oldpage = NULL; | |
924 | unsigned long num_pages, bit_cnt = 0; | |
925 | struct file *file; | |
d785a06a | 926 | unsigned long bytes, offset; |
32a7627c N |
927 | int outofdate; |
928 | int ret = -ENOSPC; | |
ea03aff9 | 929 | void *paddr; |
32a7627c N |
930 | |
931 | chunks = bitmap->chunks; | |
932 | file = bitmap->file; | |
933 | ||
42a04b50 | 934 | BUG_ON(!file && !bitmap->mddev->bitmap_info.offset); |
32a7627c | 935 | |
32a7627c | 936 | outofdate = bitmap->flags & BITMAP_STALE; |
32a7627c N |
937 | if (outofdate) |
938 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
939 | "recovery\n", bmname(bitmap)); | |
940 | ||
e384e585 | 941 | bytes = DIV_ROUND_UP(bitmap->chunks, 8); |
ece5cff0 N |
942 | if (!bitmap->mddev->bitmap_info.external) |
943 | bytes += sizeof(bitmap_super_t); | |
bc7f77de | 944 | |
e384e585 | 945 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); |
bc7f77de | 946 | |
ece5cff0 | 947 | if (file && i_size_read(file->f_mapping->host) < bytes) { |
32a7627c N |
948 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
949 | bmname(bitmap), | |
950 | (unsigned long) i_size_read(file->f_mapping->host), | |
ece5cff0 | 951 | bytes); |
4ad13663 | 952 | goto err; |
32a7627c | 953 | } |
bc7f77de N |
954 | |
955 | ret = -ENOMEM; | |
956 | ||
32a7627c | 957 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
bc7f77de | 958 | if (!bitmap->filemap) |
4ad13663 | 959 | goto err; |
32a7627c | 960 | |
e16b68b6 N |
961 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
962 | bitmap->filemap_attr = kzalloc( | |
ac2f40be | 963 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
e16b68b6 | 964 | GFP_KERNEL); |
bc7f77de | 965 | if (!bitmap->filemap_attr) |
4ad13663 | 966 | goto err; |
32a7627c | 967 | |
32a7627c N |
968 | oldindex = ~0L; |
969 | ||
970 | for (i = 0; i < chunks; i++) { | |
bd926c63 | 971 | int b; |
ece5cff0 N |
972 | index = file_page_index(bitmap, i); |
973 | bit = file_page_offset(bitmap, i); | |
32a7627c | 974 | if (index != oldindex) { /* this is a new page, read it in */ |
d785a06a | 975 | int count; |
32a7627c | 976 | /* unmap the old page, we're done with it */ |
d785a06a | 977 | if (index == num_pages-1) |
ece5cff0 | 978 | count = bytes - index * PAGE_SIZE; |
d785a06a N |
979 | else |
980 | count = PAGE_SIZE; | |
ece5cff0 | 981 | if (index == 0 && bitmap->sb_page) { |
32a7627c N |
982 | /* |
983 | * if we're here then the superblock page | |
984 | * contains some bits (PAGE_SIZE != sizeof sb) | |
985 | * we've already read it in, so just use it | |
986 | */ | |
987 | page = bitmap->sb_page; | |
988 | offset = sizeof(bitmap_super_t); | |
53845270 | 989 | if (!file) |
5c04f551 VK |
990 | page = read_sb_page( |
991 | bitmap->mddev, | |
992 | bitmap->mddev->bitmap_info.offset, | |
993 | page, | |
994 | index, count); | |
a654b9d8 | 995 | } else if (file) { |
d785a06a | 996 | page = read_page(file, index, bitmap, count); |
a654b9d8 N |
997 | offset = 0; |
998 | } else { | |
42a04b50 N |
999 | page = read_sb_page(bitmap->mddev, |
1000 | bitmap->mddev->bitmap_info.offset, | |
a2ed9615 N |
1001 | NULL, |
1002 | index, count); | |
32a7627c N |
1003 | offset = 0; |
1004 | } | |
a654b9d8 N |
1005 | if (IS_ERR(page)) { /* read error */ |
1006 | ret = PTR_ERR(page); | |
4ad13663 | 1007 | goto err; |
a654b9d8 N |
1008 | } |
1009 | ||
32a7627c N |
1010 | oldindex = index; |
1011 | oldpage = page; | |
32a7627c | 1012 | |
b74fd282 N |
1013 | bitmap->filemap[bitmap->file_pages++] = page; |
1014 | bitmap->last_page_size = count; | |
1015 | ||
32a7627c N |
1016 | if (outofdate) { |
1017 | /* | |
1018 | * if bitmap is out of date, dirty the | |
ac2f40be | 1019 | * whole page and write it out |
32a7627c | 1020 | */ |
ea03aff9 N |
1021 | paddr = kmap_atomic(page, KM_USER0); |
1022 | memset(paddr + offset, 0xff, | |
6a07997f | 1023 | PAGE_SIZE - offset); |
ea03aff9 | 1024 | kunmap_atomic(paddr, KM_USER0); |
4ad13663 N |
1025 | write_page(bitmap, page, 1); |
1026 | ||
1027 | ret = -EIO; | |
b74fd282 | 1028 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
4ad13663 | 1029 | goto err; |
32a7627c | 1030 | } |
32a7627c | 1031 | } |
ea03aff9 | 1032 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1033 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 1034 | b = test_bit(bit, paddr); |
bd926c63 | 1035 | else |
6b33aff3 | 1036 | b = test_bit_le(bit, paddr); |
ea03aff9 | 1037 | kunmap_atomic(paddr, KM_USER0); |
bd926c63 | 1038 | if (b) { |
32a7627c | 1039 | /* if the disk bit is set, set the memory bit */ |
db305e50 N |
1040 | int needed = ((sector_t)(i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) |
1041 | >= start); | |
1042 | bitmap_set_memory_bits(bitmap, | |
1043 | (sector_t)i << CHUNK_BLOCK_SHIFT(bitmap), | |
1044 | needed); | |
32a7627c N |
1045 | bit_cnt++; |
1046 | } | |
32a7627c N |
1047 | } |
1048 | ||
ac2f40be | 1049 | /* everything went OK */ |
32a7627c N |
1050 | ret = 0; |
1051 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); | |
1052 | ||
32a7627c N |
1053 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
1054 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
1055 | md_wakeup_thread(bitmap->mddev->thread); | |
1056 | } | |
1057 | ||
32a7627c | 1058 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
9c81075f JB |
1059 | "read %lu/%lu pages, set %lu of %lu bits\n", |
1060 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, chunks); | |
4ad13663 N |
1061 | |
1062 | return 0; | |
32a7627c | 1063 | |
4ad13663 N |
1064 | err: |
1065 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", | |
1066 | bmname(bitmap), ret); | |
32a7627c N |
1067 | return ret; |
1068 | } | |
1069 | ||
a654b9d8 N |
1070 | void bitmap_write_all(struct bitmap *bitmap) |
1071 | { | |
1072 | /* We don't actually write all bitmap blocks here, | |
1073 | * just flag them as needing to be written | |
1074 | */ | |
ec7a3197 | 1075 | int i; |
a654b9d8 | 1076 | |
7c8f4247 | 1077 | spin_lock_irq(&bitmap->lock); |
ac2f40be | 1078 | for (i = 0; i < bitmap->file_pages; i++) |
ec7a3197 N |
1079 | set_page_attr(bitmap, bitmap->filemap[i], |
1080 | BITMAP_PAGE_NEEDWRITE); | |
2585f3ef | 1081 | bitmap->allclean = 0; |
7c8f4247 | 1082 | spin_unlock_irq(&bitmap->lock); |
a654b9d8 N |
1083 | } |
1084 | ||
32a7627c N |
1085 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
1086 | { | |
1087 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1088 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1089 | bitmap->bp[page].count += inc; | |
32a7627c N |
1090 | bitmap_checkfree(bitmap, page); |
1091 | } | |
1092 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, | |
57dab0bd | 1093 | sector_t offset, sector_t *blocks, |
32a7627c N |
1094 | int create); |
1095 | ||
1096 | /* | |
1097 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1098 | * out to disk | |
1099 | */ | |
1100 | ||
fd01b88c | 1101 | void bitmap_daemon_work(struct mddev *mddev) |
32a7627c | 1102 | { |
aa5cbd10 | 1103 | struct bitmap *bitmap; |
aa3163f8 | 1104 | unsigned long j; |
32a7627c N |
1105 | unsigned long flags; |
1106 | struct page *page = NULL, *lastpage = NULL; | |
57dab0bd | 1107 | sector_t blocks; |
ea03aff9 | 1108 | void *paddr; |
32a7627c | 1109 | |
aa5cbd10 N |
1110 | /* Use a mutex to guard daemon_work against |
1111 | * bitmap_destroy. | |
1112 | */ | |
c3d9714e | 1113 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1114 | bitmap = mddev->bitmap; |
1115 | if (bitmap == NULL) { | |
c3d9714e | 1116 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1117 | return; |
aa5cbd10 | 1118 | } |
42a04b50 | 1119 | if (time_before(jiffies, bitmap->daemon_lastrun |
2e61ebbc | 1120 | + mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1121 | goto done; |
1122 | ||
32a7627c | 1123 | bitmap->daemon_lastrun = jiffies; |
8311c29d | 1124 | if (bitmap->allclean) { |
2e61ebbc | 1125 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
aa5cbd10 | 1126 | goto done; |
8311c29d N |
1127 | } |
1128 | bitmap->allclean = 1; | |
32a7627c | 1129 | |
be512691 | 1130 | spin_lock_irqsave(&bitmap->lock, flags); |
32a7627c N |
1131 | for (j = 0; j < bitmap->chunks; j++) { |
1132 | bitmap_counter_t *bmc; | |
3520fa4d JB |
1133 | if (!bitmap->filemap) |
1134 | /* error or shutdown */ | |
1135 | break; | |
1136 | ||
1137 | page = filemap_get_page(bitmap, j); | |
32a7627c N |
1138 | |
1139 | if (page != lastpage) { | |
aa3163f8 | 1140 | /* skip this page unless it's marked as needing cleaning */ |
5a537df4 | 1141 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_PENDING)) { |
ec7a3197 N |
1142 | int need_write = test_page_attr(bitmap, page, |
1143 | BITMAP_PAGE_NEEDWRITE); | |
a647e4bc | 1144 | if (need_write) |
aa3163f8 | 1145 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
a647e4bc | 1146 | |
aa3163f8 | 1147 | spin_unlock_irqrestore(&bitmap->lock, flags); |
2585f3ef | 1148 | if (need_write) |
4ad13663 | 1149 | write_page(bitmap, page, 0); |
be512691 N |
1150 | spin_lock_irqsave(&bitmap->lock, flags); |
1151 | j |= (PAGE_BITS - 1); | |
aa3163f8 N |
1152 | continue; |
1153 | } | |
1154 | ||
32a7627c | 1155 | /* grab the new page, sync and release the old */ |
32a7627c | 1156 | if (lastpage != NULL) { |
2585f3ef N |
1157 | if (test_page_attr(bitmap, lastpage, |
1158 | BITMAP_PAGE_NEEDWRITE)) { | |
1159 | clear_page_attr(bitmap, lastpage, | |
1160 | BITMAP_PAGE_NEEDWRITE); | |
32a7627c | 1161 | spin_unlock_irqrestore(&bitmap->lock, flags); |
4ad13663 | 1162 | write_page(bitmap, lastpage, 0); |
32a7627c | 1163 | } else { |
2585f3ef N |
1164 | set_page_attr(bitmap, lastpage, |
1165 | BITMAP_PAGE_NEEDWRITE); | |
1166 | bitmap->allclean = 0; | |
32a7627c N |
1167 | spin_unlock_irqrestore(&bitmap->lock, flags); |
1168 | } | |
32a7627c N |
1169 | } else |
1170 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1171 | lastpage = page; | |
a0da84f3 NB |
1172 | |
1173 | /* We are possibly going to clear some bits, so make | |
1174 | * sure that events_cleared is up-to-date. | |
1175 | */ | |
ece5cff0 | 1176 | if (bitmap->need_sync && |
2e61ebbc | 1177 | mddev->bitmap_info.external == 0) { |
a0da84f3 NB |
1178 | bitmap_super_t *sb; |
1179 | bitmap->need_sync = 0; | |
1180 | sb = kmap_atomic(bitmap->sb_page, KM_USER0); | |
1181 | sb->events_cleared = | |
1182 | cpu_to_le64(bitmap->events_cleared); | |
1183 | kunmap_atomic(sb, KM_USER0); | |
1184 | write_page(bitmap, bitmap->sb_page, 1); | |
1185 | } | |
32a7627c | 1186 | spin_lock_irqsave(&bitmap->lock, flags); |
ece5cff0 | 1187 | if (!bitmap->need_sync) |
5a537df4 | 1188 | clear_page_attr(bitmap, page, BITMAP_PAGE_PENDING); |
2585f3ef N |
1189 | else |
1190 | bitmap->allclean = 0; | |
32a7627c | 1191 | } |
db305e50 N |
1192 | bmc = bitmap_get_counter(bitmap, |
1193 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
1194 | &blocks, 0); | |
5a537df4 N |
1195 | if (!bmc) |
1196 | j |= PAGE_COUNTER_MASK; | |
1197 | else if (*bmc) { | |
5a537df4 | 1198 | if (*bmc == 1 && !bitmap->need_sync) { |
32a7627c N |
1199 | /* we can clear the bit */ |
1200 | *bmc = 0; | |
db305e50 N |
1201 | bitmap_count_page(bitmap, |
1202 | (sector_t)j << CHUNK_BLOCK_SHIFT(bitmap), | |
32a7627c N |
1203 | -1); |
1204 | ||
1205 | /* clear the bit */ | |
3520fa4d JB |
1206 | paddr = kmap_atomic(page, KM_USER0); |
1207 | if (bitmap->flags & BITMAP_HOSTENDIAN) | |
1208 | clear_bit(file_page_offset(bitmap, j), | |
1209 | paddr); | |
1210 | else | |
1211 | __clear_bit_le( | |
5a537df4 N |
1212 | file_page_offset(bitmap, |
1213 | j), | |
1214 | paddr); | |
3520fa4d | 1215 | kunmap_atomic(paddr, KM_USER0); |
5a537df4 N |
1216 | } else if (*bmc <= 2) { |
1217 | *bmc = 1; /* maybe clear the bit next time */ | |
1218 | set_page_attr(bitmap, page, BITMAP_PAGE_PENDING); | |
2585f3ef | 1219 | bitmap->allclean = 0; |
32a7627c | 1220 | } |
5a537df4 | 1221 | } |
32a7627c | 1222 | } |
be512691 | 1223 | spin_unlock_irqrestore(&bitmap->lock, flags); |
32a7627c N |
1224 | |
1225 | /* now sync the final page */ | |
3520fa4d | 1226 | if (lastpage != NULL) { |
32a7627c | 1227 | spin_lock_irqsave(&bitmap->lock, flags); |
ec7a3197 | 1228 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1229 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1230 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
3520fa4d | 1231 | write_page(bitmap, lastpage, 0); |
32a7627c N |
1232 | } else { |
1233 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
2585f3ef | 1234 | bitmap->allclean = 0; |
32a7627c N |
1235 | spin_unlock_irqrestore(&bitmap->lock, flags); |
1236 | } | |
32a7627c N |
1237 | } |
1238 | ||
7be3dfec | 1239 | done: |
8311c29d | 1240 | if (bitmap->allclean == 0) |
2e61ebbc N |
1241 | mddev->thread->timeout = |
1242 | mddev->bitmap_info.daemon_sleep; | |
c3d9714e | 1243 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1244 | } |
1245 | ||
32a7627c | 1246 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
57dab0bd | 1247 | sector_t offset, sector_t *blocks, |
32a7627c | 1248 | int create) |
ee305ace N |
1249 | __releases(bitmap->lock) |
1250 | __acquires(bitmap->lock) | |
32a7627c N |
1251 | { |
1252 | /* If 'create', we might release the lock and reclaim it. | |
1253 | * The lock must have been taken with interrupts enabled. | |
1254 | * If !create, we don't release the lock. | |
1255 | */ | |
1256 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1257 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1258 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1259 | sector_t csize; | |
ef425673 | 1260 | int err; |
32a7627c | 1261 | |
ef425673 N |
1262 | err = bitmap_checkpage(bitmap, page, create); |
1263 | ||
1264 | if (bitmap->bp[page].hijacked || | |
1265 | bitmap->bp[page].map == NULL) | |
1266 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + | |
1267 | PAGE_COUNTER_SHIFT - 1); | |
1268 | else | |
32a7627c | 1269 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); |
ef425673 N |
1270 | *blocks = csize - (offset & (csize - 1)); |
1271 | ||
1272 | if (err < 0) | |
32a7627c | 1273 | return NULL; |
ef425673 | 1274 | |
32a7627c N |
1275 | /* now locked ... */ |
1276 | ||
1277 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1278 | /* should we use the first or second counter field | |
1279 | * of the hijacked pointer? */ | |
1280 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
32a7627c N |
1281 | return &((bitmap_counter_t *) |
1282 | &bitmap->bp[page].map)[hi]; | |
ef425673 | 1283 | } else /* page is allocated */ |
32a7627c N |
1284 | return (bitmap_counter_t *) |
1285 | &(bitmap->bp[page].map[pageoff]); | |
32a7627c N |
1286 | } |
1287 | ||
4b6d287f | 1288 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1289 | { |
ac2f40be N |
1290 | if (!bitmap) |
1291 | return 0; | |
4b6d287f N |
1292 | |
1293 | if (behind) { | |
696fcd53 | 1294 | int bw; |
4b6d287f | 1295 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1296 | bw = atomic_read(&bitmap->behind_writes); |
1297 | if (bw > bitmap->behind_writes_used) | |
1298 | bitmap->behind_writes_used = bw; | |
1299 | ||
36a4e1fe N |
1300 | pr_debug("inc write-behind count %d/%lu\n", |
1301 | bw, bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1302 | } |
1303 | ||
32a7627c | 1304 | while (sectors) { |
57dab0bd | 1305 | sector_t blocks; |
32a7627c N |
1306 | bitmap_counter_t *bmc; |
1307 | ||
1308 | spin_lock_irq(&bitmap->lock); | |
1309 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); | |
1310 | if (!bmc) { | |
1311 | spin_unlock_irq(&bitmap->lock); | |
1312 | return 0; | |
1313 | } | |
1314 | ||
27d5ea04 | 1315 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
da6e1a32 NB |
1316 | DEFINE_WAIT(__wait); |
1317 | /* note that it is safe to do the prepare_to_wait | |
1318 | * after the test as long as we do it before dropping | |
1319 | * the spinlock. | |
1320 | */ | |
1321 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1322 | TASK_UNINTERRUPTIBLE); | |
1323 | spin_unlock_irq(&bitmap->lock); | |
7eaceacc | 1324 | io_schedule(); |
da6e1a32 NB |
1325 | finish_wait(&bitmap->overflow_wait, &__wait); |
1326 | continue; | |
1327 | } | |
1328 | ||
ac2f40be | 1329 | switch (*bmc) { |
32a7627c N |
1330 | case 0: |
1331 | bitmap_file_set_bit(bitmap, offset); | |
ac2f40be | 1332 | bitmap_count_page(bitmap, offset, 1); |
32a7627c N |
1333 | /* fall through */ |
1334 | case 1: | |
1335 | *bmc = 2; | |
1336 | } | |
da6e1a32 | 1337 | |
32a7627c N |
1338 | (*bmc)++; |
1339 | ||
1340 | spin_unlock_irq(&bitmap->lock); | |
1341 | ||
1342 | offset += blocks; | |
1343 | if (sectors > blocks) | |
1344 | sectors -= blocks; | |
ac2f40be N |
1345 | else |
1346 | sectors = 0; | |
32a7627c N |
1347 | } |
1348 | return 0; | |
1349 | } | |
ac2f40be | 1350 | EXPORT_SYMBOL(bitmap_startwrite); |
32a7627c N |
1351 | |
1352 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1353 | int success, int behind) |
32a7627c | 1354 | { |
ac2f40be N |
1355 | if (!bitmap) |
1356 | return; | |
4b6d287f | 1357 | if (behind) { |
e555190d N |
1358 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1359 | wake_up(&bitmap->behind_wait); | |
36a4e1fe N |
1360 | pr_debug("dec write-behind count %d/%lu\n", |
1361 | atomic_read(&bitmap->behind_writes), | |
1362 | bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1363 | } |
1364 | ||
32a7627c | 1365 | while (sectors) { |
57dab0bd | 1366 | sector_t blocks; |
32a7627c N |
1367 | unsigned long flags; |
1368 | bitmap_counter_t *bmc; | |
1369 | ||
1370 | spin_lock_irqsave(&bitmap->lock, flags); | |
1371 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); | |
1372 | if (!bmc) { | |
1373 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1374 | return; | |
1375 | } | |
1376 | ||
961902c0 | 1377 | if (success && !bitmap->mddev->degraded && |
a0da84f3 NB |
1378 | bitmap->events_cleared < bitmap->mddev->events) { |
1379 | bitmap->events_cleared = bitmap->mddev->events; | |
1380 | bitmap->need_sync = 1; | |
5ff5afff | 1381 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1382 | } |
1383 | ||
27d5ea04 | 1384 | if (!success && !NEEDED(*bmc)) |
32a7627c N |
1385 | *bmc |= NEEDED_MASK; |
1386 | ||
27d5ea04 | 1387 | if (COUNTER(*bmc) == COUNTER_MAX) |
da6e1a32 NB |
1388 | wake_up(&bitmap->overflow_wait); |
1389 | ||
32a7627c | 1390 | (*bmc)--; |
2585f3ef | 1391 | if (*bmc <= 2) { |
32a7627c | 1392 | set_page_attr(bitmap, |
e384e585 N |
1393 | filemap_get_page( |
1394 | bitmap, | |
1395 | offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
5a537df4 | 1396 | BITMAP_PAGE_PENDING); |
2585f3ef N |
1397 | bitmap->allclean = 0; |
1398 | } | |
32a7627c N |
1399 | spin_unlock_irqrestore(&bitmap->lock, flags); |
1400 | offset += blocks; | |
1401 | if (sectors > blocks) | |
1402 | sectors -= blocks; | |
ac2f40be N |
1403 | else |
1404 | sectors = 0; | |
32a7627c N |
1405 | } |
1406 | } | |
ac2f40be | 1407 | EXPORT_SYMBOL(bitmap_endwrite); |
32a7627c | 1408 | |
57dab0bd | 1409 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a | 1410 | int degraded) |
32a7627c N |
1411 | { |
1412 | bitmap_counter_t *bmc; | |
1413 | int rv; | |
1414 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1415 | *blocks = 1024; | |
1416 | return 1; /* always resync if no bitmap */ | |
1417 | } | |
1418 | spin_lock_irq(&bitmap->lock); | |
1419 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1420 | rv = 0; | |
1421 | if (bmc) { | |
1422 | /* locked */ | |
1423 | if (RESYNC(*bmc)) | |
1424 | rv = 1; | |
1425 | else if (NEEDED(*bmc)) { | |
1426 | rv = 1; | |
6a806c51 N |
1427 | if (!degraded) { /* don't set/clear bits if degraded */ |
1428 | *bmc |= RESYNC_MASK; | |
1429 | *bmc &= ~NEEDED_MASK; | |
1430 | } | |
32a7627c N |
1431 | } |
1432 | } | |
1433 | spin_unlock_irq(&bitmap->lock); | |
1434 | return rv; | |
1435 | } | |
1436 | ||
57dab0bd | 1437 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a N |
1438 | int degraded) |
1439 | { | |
1440 | /* bitmap_start_sync must always report on multiples of whole | |
1441 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1442 | * get confused. | |
1443 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1444 | * At least PAGE_SIZE>>9 blocks are covered. | |
1445 | * Return the 'or' of the result. | |
1446 | */ | |
1447 | int rv = 0; | |
57dab0bd | 1448 | sector_t blocks1; |
1187cf0a N |
1449 | |
1450 | *blocks = 0; | |
1451 | while (*blocks < (PAGE_SIZE>>9)) { | |
1452 | rv |= __bitmap_start_sync(bitmap, offset, | |
1453 | &blocks1, degraded); | |
1454 | offset += blocks1; | |
1455 | *blocks += blocks1; | |
1456 | } | |
1457 | return rv; | |
1458 | } | |
ac2f40be | 1459 | EXPORT_SYMBOL(bitmap_start_sync); |
1187cf0a | 1460 | |
57dab0bd | 1461 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
32a7627c N |
1462 | { |
1463 | bitmap_counter_t *bmc; | |
1464 | unsigned long flags; | |
ac2f40be N |
1465 | |
1466 | if (bitmap == NULL) { | |
32a7627c N |
1467 | *blocks = 1024; |
1468 | return; | |
1469 | } | |
1470 | spin_lock_irqsave(&bitmap->lock, flags); | |
1471 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1472 | if (bmc == NULL) | |
1473 | goto unlock; | |
1474 | /* locked */ | |
32a7627c N |
1475 | if (RESYNC(*bmc)) { |
1476 | *bmc &= ~RESYNC_MASK; | |
1477 | ||
1478 | if (!NEEDED(*bmc) && aborted) | |
1479 | *bmc |= NEEDED_MASK; | |
1480 | else { | |
2585f3ef | 1481 | if (*bmc <= 2) { |
32a7627c N |
1482 | set_page_attr(bitmap, |
1483 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
5a537df4 | 1484 | BITMAP_PAGE_PENDING); |
2585f3ef N |
1485 | bitmap->allclean = 0; |
1486 | } | |
32a7627c N |
1487 | } |
1488 | } | |
1489 | unlock: | |
1490 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1491 | } | |
ac2f40be | 1492 | EXPORT_SYMBOL(bitmap_end_sync); |
32a7627c N |
1493 | |
1494 | void bitmap_close_sync(struct bitmap *bitmap) | |
1495 | { | |
1496 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1497 | * properly have been aborted. It remains to us to clear the | |
1498 | * RESYNC bit wherever it is still on | |
1499 | */ | |
1500 | sector_t sector = 0; | |
57dab0bd | 1501 | sector_t blocks; |
b47490c9 N |
1502 | if (!bitmap) |
1503 | return; | |
32a7627c N |
1504 | while (sector < bitmap->mddev->resync_max_sectors) { |
1505 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
b47490c9 N |
1506 | sector += blocks; |
1507 | } | |
1508 | } | |
ac2f40be | 1509 | EXPORT_SYMBOL(bitmap_close_sync); |
b47490c9 N |
1510 | |
1511 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector) | |
1512 | { | |
1513 | sector_t s = 0; | |
57dab0bd | 1514 | sector_t blocks; |
b47490c9 N |
1515 | |
1516 | if (!bitmap) | |
1517 | return; | |
1518 | if (sector == 0) { | |
1519 | bitmap->last_end_sync = jiffies; | |
1520 | return; | |
1521 | } | |
1522 | if (time_before(jiffies, (bitmap->last_end_sync | |
1b04be96 | 1523 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1524 | return; |
1525 | wait_event(bitmap->mddev->recovery_wait, | |
1526 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1527 | ||
75d3da43 | 1528 | bitmap->mddev->curr_resync_completed = sector; |
070dc6dd | 1529 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
b47490c9 N |
1530 | sector &= ~((1ULL << CHUNK_BLOCK_SHIFT(bitmap)) - 1); |
1531 | s = 0; | |
1532 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
1533 | bitmap_end_sync(bitmap, s, &blocks, 0); | |
1534 | s += blocks; | |
32a7627c | 1535 | } |
b47490c9 | 1536 | bitmap->last_end_sync = jiffies; |
acb180b0 | 1537 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
32a7627c | 1538 | } |
ac2f40be | 1539 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
32a7627c | 1540 | |
6a07997f | 1541 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1542 | { |
1543 | /* For each chunk covered by any of these sectors, set the | |
193f1c93 | 1544 | * counter to 1 and set resync_needed. They should all |
32a7627c N |
1545 | * be 0 at this point |
1546 | */ | |
193f1c93 | 1547 | |
57dab0bd | 1548 | sector_t secs; |
193f1c93 N |
1549 | bitmap_counter_t *bmc; |
1550 | spin_lock_irq(&bitmap->lock); | |
1551 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); | |
1552 | if (!bmc) { | |
32a7627c | 1553 | spin_unlock_irq(&bitmap->lock); |
193f1c93 | 1554 | return; |
32a7627c | 1555 | } |
ac2f40be | 1556 | if (!*bmc) { |
193f1c93 | 1557 | struct page *page; |
915c420d | 1558 | *bmc = 2 | (needed ? NEEDED_MASK : 0); |
193f1c93 N |
1559 | bitmap_count_page(bitmap, offset, 1); |
1560 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); | |
5a537df4 | 1561 | set_page_attr(bitmap, page, BITMAP_PAGE_PENDING); |
2585f3ef | 1562 | bitmap->allclean = 0; |
193f1c93 N |
1563 | } |
1564 | spin_unlock_irq(&bitmap->lock); | |
32a7627c N |
1565 | } |
1566 | ||
9b1d1dac PC |
1567 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1568 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1569 | { | |
1570 | unsigned long chunk; | |
1571 | ||
1572 | for (chunk = s; chunk <= e; chunk++) { | |
db305e50 | 1573 | sector_t sec = (sector_t)chunk << CHUNK_BLOCK_SHIFT(bitmap); |
9b1d1dac | 1574 | bitmap_set_memory_bits(bitmap, sec, 1); |
7c8f4247 | 1575 | spin_lock_irq(&bitmap->lock); |
9b1d1dac | 1576 | bitmap_file_set_bit(bitmap, sec); |
7c8f4247 | 1577 | spin_unlock_irq(&bitmap->lock); |
ffa23322 N |
1578 | if (sec < bitmap->mddev->recovery_cp) |
1579 | /* We are asserting that the array is dirty, | |
1580 | * so move the recovery_cp address back so | |
1581 | * that it is obvious that it is dirty | |
1582 | */ | |
1583 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1584 | } |
1585 | } | |
1586 | ||
6b8b3e8a N |
1587 | /* |
1588 | * flush out any pending updates | |
1589 | */ | |
fd01b88c | 1590 | void bitmap_flush(struct mddev *mddev) |
6b8b3e8a N |
1591 | { |
1592 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1593 | long sleep; |
6b8b3e8a N |
1594 | |
1595 | if (!bitmap) /* there was no bitmap */ | |
1596 | return; | |
1597 | ||
1598 | /* run the daemon_work three time to ensure everything is flushed | |
1599 | * that can be | |
1600 | */ | |
1b04be96 | 1601 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1602 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1603 | bitmap_daemon_work(mddev); |
42a04b50 | 1604 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1605 | bitmap_daemon_work(mddev); |
42a04b50 | 1606 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1607 | bitmap_daemon_work(mddev); |
6b8b3e8a N |
1608 | bitmap_update_sb(bitmap); |
1609 | } | |
1610 | ||
32a7627c N |
1611 | /* |
1612 | * free memory that was allocated | |
1613 | */ | |
3178b0db | 1614 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1615 | { |
1616 | unsigned long k, pages; | |
1617 | struct bitmap_page *bp; | |
32a7627c N |
1618 | |
1619 | if (!bitmap) /* there was no bitmap */ | |
1620 | return; | |
1621 | ||
32a7627c N |
1622 | /* release the bitmap file and kill the daemon */ |
1623 | bitmap_file_put(bitmap); | |
1624 | ||
1625 | bp = bitmap->bp; | |
1626 | pages = bitmap->pages; | |
1627 | ||
1628 | /* free all allocated memory */ | |
1629 | ||
32a7627c N |
1630 | if (bp) /* deallocate the page memory */ |
1631 | for (k = 0; k < pages; k++) | |
1632 | if (bp[k].map && !bp[k].hijacked) | |
1633 | kfree(bp[k].map); | |
1634 | kfree(bp); | |
1635 | kfree(bitmap); | |
1636 | } | |
aa5cbd10 | 1637 | |
fd01b88c | 1638 | void bitmap_destroy(struct mddev *mddev) |
3178b0db N |
1639 | { |
1640 | struct bitmap *bitmap = mddev->bitmap; | |
1641 | ||
1642 | if (!bitmap) /* there was no bitmap */ | |
1643 | return; | |
1644 | ||
c3d9714e | 1645 | mutex_lock(&mddev->bitmap_info.mutex); |
3178b0db | 1646 | mddev->bitmap = NULL; /* disconnect from the md device */ |
c3d9714e | 1647 | mutex_unlock(&mddev->bitmap_info.mutex); |
b15c2e57 N |
1648 | if (mddev->thread) |
1649 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db | 1650 | |
ece5cff0 N |
1651 | if (bitmap->sysfs_can_clear) |
1652 | sysfs_put(bitmap->sysfs_can_clear); | |
1653 | ||
3178b0db N |
1654 | bitmap_free(bitmap); |
1655 | } | |
32a7627c N |
1656 | |
1657 | /* | |
1658 | * initialize the bitmap structure | |
1659 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1660 | */ | |
fd01b88c | 1661 | int bitmap_create(struct mddev *mddev) |
32a7627c N |
1662 | { |
1663 | struct bitmap *bitmap; | |
1f593903 | 1664 | sector_t blocks = mddev->resync_max_sectors; |
32a7627c N |
1665 | unsigned long chunks; |
1666 | unsigned long pages; | |
c3d9714e | 1667 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1668 | int err; |
5ff5afff | 1669 | struct sysfs_dirent *bm = NULL; |
32a7627c | 1670 | |
5f6e3c83 | 1671 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1672 | |
e384e585 | 1673 | if (!file |
3520fa4d | 1674 | && !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */ |
32a7627c N |
1675 | return 0; |
1676 | ||
c3d9714e | 1677 | BUG_ON(file && mddev->bitmap_info.offset); |
a654b9d8 | 1678 | |
9ffae0cf | 1679 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c N |
1680 | if (!bitmap) |
1681 | return -ENOMEM; | |
1682 | ||
32a7627c | 1683 | spin_lock_init(&bitmap->lock); |
ce25c31b N |
1684 | atomic_set(&bitmap->pending_writes, 0); |
1685 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1686 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1687 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1688 | |
32a7627c | 1689 | bitmap->mddev = mddev; |
32a7627c | 1690 | |
5ff5afff N |
1691 | if (mddev->kobj.sd) |
1692 | bm = sysfs_get_dirent(mddev->kobj.sd, NULL, "bitmap"); | |
ece5cff0 | 1693 | if (bm) { |
3ff195b0 | 1694 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, NULL, "can_clear"); |
ece5cff0 N |
1695 | sysfs_put(bm); |
1696 | } else | |
1697 | bitmap->sysfs_can_clear = NULL; | |
1698 | ||
32a7627c | 1699 | bitmap->file = file; |
ce25c31b N |
1700 | if (file) { |
1701 | get_file(file); | |
ae8fa283 N |
1702 | /* As future accesses to this file will use bmap, |
1703 | * and bypass the page cache, we must sync the file | |
1704 | * first. | |
1705 | */ | |
8018ab05 | 1706 | vfs_fsync(file, 1); |
ce25c31b | 1707 | } |
42a04b50 | 1708 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
9c81075f JB |
1709 | if (!mddev->bitmap_info.external) { |
1710 | /* | |
1711 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is | |
1712 | * instructing us to create a new on-disk bitmap instance. | |
1713 | */ | |
1714 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) | |
1715 | err = bitmap_new_disk_sb(bitmap); | |
1716 | else | |
1717 | err = bitmap_read_sb(bitmap); | |
1718 | } else { | |
ece5cff0 N |
1719 | err = 0; |
1720 | if (mddev->bitmap_info.chunksize == 0 || | |
1721 | mddev->bitmap_info.daemon_sleep == 0) | |
1722 | /* chunksize and time_base need to be | |
1723 | * set first. */ | |
1724 | err = -EINVAL; | |
1725 | } | |
32a7627c | 1726 | if (err) |
3178b0db | 1727 | goto error; |
32a7627c | 1728 | |
624ce4f5 | 1729 | bitmap->daemon_lastrun = jiffies; |
42a04b50 | 1730 | bitmap->chunkshift = ffz(~mddev->bitmap_info.chunksize); |
32a7627c N |
1731 | |
1732 | /* now that chunksize and chunkshift are set, we can use these macros */ | |
ac2f40be | 1733 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) >> |
1f593903 | 1734 | CHUNK_BLOCK_SHIFT(bitmap); |
ac2f40be | 1735 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
32a7627c N |
1736 | |
1737 | BUG_ON(!pages); | |
1738 | ||
1739 | bitmap->chunks = chunks; | |
1740 | bitmap->pages = pages; | |
1741 | bitmap->missing_pages = pages; | |
32a7627c | 1742 | |
9ffae0cf | 1743 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
29d3247e | 1744 | |
3178b0db | 1745 | err = -ENOMEM; |
32a7627c | 1746 | if (!bitmap->bp) |
3178b0db | 1747 | goto error; |
32a7627c | 1748 | |
69e51b44 N |
1749 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
1750 | pages, bmname(bitmap)); | |
1751 | ||
1752 | mddev->bitmap = bitmap; | |
1753 | ||
1754 | ||
1755 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; | |
1756 | ||
1757 | error: | |
1758 | bitmap_free(bitmap); | |
1759 | return err; | |
1760 | } | |
1761 | ||
fd01b88c | 1762 | int bitmap_load(struct mddev *mddev) |
69e51b44 N |
1763 | { |
1764 | int err = 0; | |
3520fa4d | 1765 | sector_t start = 0; |
69e51b44 N |
1766 | sector_t sector = 0; |
1767 | struct bitmap *bitmap = mddev->bitmap; | |
1768 | ||
1769 | if (!bitmap) | |
1770 | goto out; | |
1771 | ||
1772 | /* Clear out old bitmap info first: Either there is none, or we | |
1773 | * are resuming after someone else has possibly changed things, | |
1774 | * so we should forget old cached info. | |
1775 | * All chunks should be clean, but some might need_sync. | |
1776 | */ | |
1777 | while (sector < mddev->resync_max_sectors) { | |
57dab0bd | 1778 | sector_t blocks; |
69e51b44 N |
1779 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
1780 | sector += blocks; | |
1781 | } | |
1782 | bitmap_close_sync(bitmap); | |
1783 | ||
3520fa4d JB |
1784 | if (mddev->degraded == 0 |
1785 | || bitmap->events_cleared == mddev->events) | |
1786 | /* no need to keep dirty bits to optimise a | |
1787 | * re-add of a missing device */ | |
1788 | start = mddev->recovery_cp; | |
1789 | ||
1790 | err = bitmap_init_from_disk(bitmap, start); | |
1791 | ||
32a7627c | 1792 | if (err) |
69e51b44 | 1793 | goto out; |
3178b0db | 1794 | |
1b04be96 | 1795 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
9cd30fdc | 1796 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 1797 | |
4ad13663 N |
1798 | bitmap_update_sb(bitmap); |
1799 | ||
69e51b44 N |
1800 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
1801 | err = -EIO; | |
1802 | out: | |
3178b0db | 1803 | return err; |
32a7627c | 1804 | } |
69e51b44 | 1805 | EXPORT_SYMBOL_GPL(bitmap_load); |
32a7627c | 1806 | |
57148964 N |
1807 | void bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
1808 | { | |
1809 | unsigned long chunk_kb; | |
1810 | unsigned long flags; | |
1811 | ||
1812 | if (!bitmap) | |
1813 | return; | |
1814 | ||
1815 | spin_lock_irqsave(&bitmap->lock, flags); | |
1816 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; | |
1817 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
1818 | "%lu%s chunk", | |
1819 | bitmap->pages - bitmap->missing_pages, | |
1820 | bitmap->pages, | |
1821 | (bitmap->pages - bitmap->missing_pages) | |
1822 | << (PAGE_SHIFT - 10), | |
1823 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, | |
1824 | chunk_kb ? "KB" : "B"); | |
1825 | if (bitmap->file) { | |
1826 | seq_printf(seq, ", file: "); | |
1827 | seq_path(seq, &bitmap->file->f_path, " \t\n"); | |
1828 | } | |
1829 | ||
1830 | seq_printf(seq, "\n"); | |
1831 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1832 | } | |
1833 | ||
43a70507 | 1834 | static ssize_t |
fd01b88c | 1835 | location_show(struct mddev *mddev, char *page) |
43a70507 N |
1836 | { |
1837 | ssize_t len; | |
ac2f40be | 1838 | if (mddev->bitmap_info.file) |
43a70507 | 1839 | len = sprintf(page, "file"); |
ac2f40be | 1840 | else if (mddev->bitmap_info.offset) |
43a70507 | 1841 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 1842 | else |
43a70507 N |
1843 | len = sprintf(page, "none"); |
1844 | len += sprintf(page+len, "\n"); | |
1845 | return len; | |
1846 | } | |
1847 | ||
1848 | static ssize_t | |
fd01b88c | 1849 | location_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
1850 | { |
1851 | ||
1852 | if (mddev->pers) { | |
1853 | if (!mddev->pers->quiesce) | |
1854 | return -EBUSY; | |
1855 | if (mddev->recovery || mddev->sync_thread) | |
1856 | return -EBUSY; | |
1857 | } | |
1858 | ||
1859 | if (mddev->bitmap || mddev->bitmap_info.file || | |
1860 | mddev->bitmap_info.offset) { | |
1861 | /* bitmap already configured. Only option is to clear it */ | |
1862 | if (strncmp(buf, "none", 4) != 0) | |
1863 | return -EBUSY; | |
1864 | if (mddev->pers) { | |
1865 | mddev->pers->quiesce(mddev, 1); | |
1866 | bitmap_destroy(mddev); | |
1867 | mddev->pers->quiesce(mddev, 0); | |
1868 | } | |
1869 | mddev->bitmap_info.offset = 0; | |
1870 | if (mddev->bitmap_info.file) { | |
1871 | struct file *f = mddev->bitmap_info.file; | |
1872 | mddev->bitmap_info.file = NULL; | |
1873 | restore_bitmap_write_access(f); | |
1874 | fput(f); | |
1875 | } | |
1876 | } else { | |
1877 | /* No bitmap, OK to set a location */ | |
1878 | long long offset; | |
1879 | if (strncmp(buf, "none", 4) == 0) | |
1880 | /* nothing to be done */; | |
1881 | else if (strncmp(buf, "file:", 5) == 0) { | |
1882 | /* Not supported yet */ | |
1883 | return -EINVAL; | |
1884 | } else { | |
1885 | int rv; | |
1886 | if (buf[0] == '+') | |
1887 | rv = strict_strtoll(buf+1, 10, &offset); | |
1888 | else | |
1889 | rv = strict_strtoll(buf, 10, &offset); | |
1890 | if (rv) | |
1891 | return rv; | |
1892 | if (offset == 0) | |
1893 | return -EINVAL; | |
ece5cff0 N |
1894 | if (mddev->bitmap_info.external == 0 && |
1895 | mddev->major_version == 0 && | |
43a70507 N |
1896 | offset != mddev->bitmap_info.default_offset) |
1897 | return -EINVAL; | |
1898 | mddev->bitmap_info.offset = offset; | |
1899 | if (mddev->pers) { | |
1900 | mddev->pers->quiesce(mddev, 1); | |
1901 | rv = bitmap_create(mddev); | |
4474ca42 N |
1902 | if (!rv) |
1903 | rv = bitmap_load(mddev); | |
43a70507 N |
1904 | if (rv) { |
1905 | bitmap_destroy(mddev); | |
1906 | mddev->bitmap_info.offset = 0; | |
1907 | } | |
1908 | mddev->pers->quiesce(mddev, 0); | |
1909 | if (rv) | |
1910 | return rv; | |
1911 | } | |
1912 | } | |
1913 | } | |
1914 | if (!mddev->external) { | |
1915 | /* Ensure new bitmap info is stored in | |
1916 | * metadata promptly. | |
1917 | */ | |
1918 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
1919 | md_wakeup_thread(mddev->thread); | |
1920 | } | |
1921 | return len; | |
1922 | } | |
1923 | ||
1924 | static struct md_sysfs_entry bitmap_location = | |
1925 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
1926 | ||
1927 | static ssize_t | |
fd01b88c | 1928 | timeout_show(struct mddev *mddev, char *page) |
43a70507 N |
1929 | { |
1930 | ssize_t len; | |
1931 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
1932 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 1933 | |
43a70507 N |
1934 | len = sprintf(page, "%lu", secs); |
1935 | if (jifs) | |
1936 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
1937 | len += sprintf(page+len, "\n"); | |
1938 | return len; | |
1939 | } | |
1940 | ||
1941 | static ssize_t | |
fd01b88c | 1942 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
1943 | { |
1944 | /* timeout can be set at any time */ | |
1945 | unsigned long timeout; | |
1946 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
1947 | if (rv) | |
1948 | return rv; | |
1949 | ||
1950 | /* just to make sure we don't overflow... */ | |
1951 | if (timeout >= LONG_MAX / HZ) | |
1952 | return -EINVAL; | |
1953 | ||
1954 | timeout = timeout * HZ / 10000; | |
1955 | ||
1956 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
1957 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
1958 | if (timeout < 1) | |
1959 | timeout = 1; | |
1960 | mddev->bitmap_info.daemon_sleep = timeout; | |
1961 | if (mddev->thread) { | |
1962 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then | |
1963 | * the bitmap is all clean and we don't need to | |
1964 | * adjust the timeout right now | |
1965 | */ | |
1966 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { | |
1967 | mddev->thread->timeout = timeout; | |
1968 | md_wakeup_thread(mddev->thread); | |
1969 | } | |
1970 | } | |
1971 | return len; | |
1972 | } | |
1973 | ||
1974 | static struct md_sysfs_entry bitmap_timeout = | |
1975 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
1976 | ||
1977 | static ssize_t | |
fd01b88c | 1978 | backlog_show(struct mddev *mddev, char *page) |
43a70507 N |
1979 | { |
1980 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
1981 | } | |
1982 | ||
1983 | static ssize_t | |
fd01b88c | 1984 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
1985 | { |
1986 | unsigned long backlog; | |
1987 | int rv = strict_strtoul(buf, 10, &backlog); | |
1988 | if (rv) | |
1989 | return rv; | |
1990 | if (backlog > COUNTER_MAX) | |
1991 | return -EINVAL; | |
1992 | mddev->bitmap_info.max_write_behind = backlog; | |
1993 | return len; | |
1994 | } | |
1995 | ||
1996 | static struct md_sysfs_entry bitmap_backlog = | |
1997 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
1998 | ||
1999 | static ssize_t | |
fd01b88c | 2000 | chunksize_show(struct mddev *mddev, char *page) |
43a70507 N |
2001 | { |
2002 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
2003 | } | |
2004 | ||
2005 | static ssize_t | |
fd01b88c | 2006 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2007 | { |
2008 | /* Can only be changed when no bitmap is active */ | |
2009 | int rv; | |
2010 | unsigned long csize; | |
2011 | if (mddev->bitmap) | |
2012 | return -EBUSY; | |
2013 | rv = strict_strtoul(buf, 10, &csize); | |
2014 | if (rv) | |
2015 | return rv; | |
2016 | if (csize < 512 || | |
2017 | !is_power_of_2(csize)) | |
2018 | return -EINVAL; | |
2019 | mddev->bitmap_info.chunksize = csize; | |
2020 | return len; | |
2021 | } | |
2022 | ||
2023 | static struct md_sysfs_entry bitmap_chunksize = | |
2024 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
2025 | ||
fd01b88c | 2026 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
ece5cff0 N |
2027 | { |
2028 | return sprintf(page, "%s\n", (mddev->bitmap_info.external | |
2029 | ? "external" : "internal")); | |
2030 | } | |
2031 | ||
fd01b88c | 2032 | static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2033 | { |
2034 | if (mddev->bitmap || | |
2035 | mddev->bitmap_info.file || | |
2036 | mddev->bitmap_info.offset) | |
2037 | return -EBUSY; | |
2038 | if (strncmp(buf, "external", 8) == 0) | |
2039 | mddev->bitmap_info.external = 1; | |
2040 | else if (strncmp(buf, "internal", 8) == 0) | |
2041 | mddev->bitmap_info.external = 0; | |
2042 | else | |
2043 | return -EINVAL; | |
2044 | return len; | |
2045 | } | |
2046 | ||
2047 | static struct md_sysfs_entry bitmap_metadata = | |
2048 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
2049 | ||
fd01b88c | 2050 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
ece5cff0 N |
2051 | { |
2052 | int len; | |
2053 | if (mddev->bitmap) | |
2054 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
2055 | "false" : "true")); | |
2056 | else | |
2057 | len = sprintf(page, "\n"); | |
2058 | return len; | |
2059 | } | |
2060 | ||
fd01b88c | 2061 | static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2062 | { |
2063 | if (mddev->bitmap == NULL) | |
2064 | return -ENOENT; | |
2065 | if (strncmp(buf, "false", 5) == 0) | |
2066 | mddev->bitmap->need_sync = 1; | |
2067 | else if (strncmp(buf, "true", 4) == 0) { | |
2068 | if (mddev->degraded) | |
2069 | return -EBUSY; | |
2070 | mddev->bitmap->need_sync = 0; | |
2071 | } else | |
2072 | return -EINVAL; | |
2073 | return len; | |
2074 | } | |
2075 | ||
2076 | static struct md_sysfs_entry bitmap_can_clear = | |
2077 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
2078 | ||
696fcd53 | 2079 | static ssize_t |
fd01b88c | 2080 | behind_writes_used_show(struct mddev *mddev, char *page) |
696fcd53 PC |
2081 | { |
2082 | if (mddev->bitmap == NULL) | |
2083 | return sprintf(page, "0\n"); | |
2084 | return sprintf(page, "%lu\n", | |
2085 | mddev->bitmap->behind_writes_used); | |
2086 | } | |
2087 | ||
2088 | static ssize_t | |
fd01b88c | 2089 | behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) |
696fcd53 PC |
2090 | { |
2091 | if (mddev->bitmap) | |
2092 | mddev->bitmap->behind_writes_used = 0; | |
2093 | return len; | |
2094 | } | |
2095 | ||
2096 | static struct md_sysfs_entry max_backlog_used = | |
2097 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2098 | behind_writes_used_show, behind_writes_used_reset); | |
2099 | ||
43a70507 N |
2100 | static struct attribute *md_bitmap_attrs[] = { |
2101 | &bitmap_location.attr, | |
2102 | &bitmap_timeout.attr, | |
2103 | &bitmap_backlog.attr, | |
2104 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2105 | &bitmap_metadata.attr, |
2106 | &bitmap_can_clear.attr, | |
696fcd53 | 2107 | &max_backlog_used.attr, |
43a70507 N |
2108 | NULL |
2109 | }; | |
2110 | struct attribute_group md_bitmap_group = { | |
2111 | .name = "bitmap", | |
2112 | .attrs = md_bitmap_attrs, | |
2113 | }; | |
2114 |