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 | */ | |
40cffcc0 | 48 | static int bitmap_checkpage(struct bitmap_counts *bitmap, |
ac2f40be | 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); |
d9590143 N |
75 | /* It is possible that this is being called inside a |
76 | * prepare_to_wait/finish_wait loop from raid5c:make_request(). | |
77 | * In general it is not permitted to sleep in that context as it | |
78 | * can cause the loop to spin freely. | |
79 | * That doesn't apply here as we can only reach this point | |
80 | * once with any loop. | |
81 | * When this function completes, either bp[page].map or | |
82 | * bp[page].hijacked. In either case, this function will | |
83 | * abort before getting to this point again. So there is | |
84 | * no risk of a free-spin, and so it is safe to assert | |
85 | * that sleeping here is allowed. | |
86 | */ | |
87 | sched_annotate_sleep(); | |
792a1d4b | 88 | mappage = kzalloc(PAGE_SIZE, GFP_NOIO); |
ac2f40be N |
89 | spin_lock_irq(&bitmap->lock); |
90 | ||
91 | if (mappage == NULL) { | |
40cffcc0 | 92 | pr_debug("md/bitmap: map page allocation failed, hijacking\n"); |
32a7627c N |
93 | /* failed - set the hijacked flag so that we can use the |
94 | * pointer as a counter */ | |
32a7627c N |
95 | if (!bitmap->bp[page].map) |
96 | bitmap->bp[page].hijacked = 1; | |
ac2f40be N |
97 | } else if (bitmap->bp[page].map || |
98 | bitmap->bp[page].hijacked) { | |
32a7627c | 99 | /* somebody beat us to getting the page */ |
792a1d4b | 100 | kfree(mappage); |
32a7627c | 101 | return 0; |
ac2f40be | 102 | } else { |
32a7627c | 103 | |
ac2f40be | 104 | /* no page was in place and we have one, so install it */ |
32a7627c | 105 | |
ac2f40be N |
106 | bitmap->bp[page].map = mappage; |
107 | bitmap->missing_pages--; | |
108 | } | |
32a7627c N |
109 | return 0; |
110 | } | |
111 | ||
32a7627c N |
112 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
113 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
114 | /* Note: lock should be held when calling this */ | |
40cffcc0 | 115 | static void bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page) |
32a7627c N |
116 | { |
117 | char *ptr; | |
118 | ||
119 | if (bitmap->bp[page].count) /* page is still busy */ | |
120 | return; | |
121 | ||
122 | /* page is no longer in use, it can be released */ | |
123 | ||
124 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
125 | bitmap->bp[page].hijacked = 0; | |
126 | bitmap->bp[page].map = NULL; | |
ac2f40be N |
127 | } else { |
128 | /* normal case, free the page */ | |
129 | ptr = bitmap->bp[page].map; | |
130 | bitmap->bp[page].map = NULL; | |
131 | bitmap->missing_pages++; | |
792a1d4b | 132 | kfree(ptr); |
32a7627c | 133 | } |
32a7627c N |
134 | } |
135 | ||
32a7627c N |
136 | /* |
137 | * bitmap file handling - read and write the bitmap file and its superblock | |
138 | */ | |
139 | ||
32a7627c N |
140 | /* |
141 | * basic page I/O operations | |
142 | */ | |
143 | ||
a654b9d8 | 144 | /* IO operations when bitmap is stored near all superblocks */ |
27581e5a N |
145 | static int read_sb_page(struct mddev *mddev, loff_t offset, |
146 | struct page *page, | |
147 | unsigned long index, int size) | |
a654b9d8 N |
148 | { |
149 | /* choose a good rdev and read the page from there */ | |
150 | ||
3cb03002 | 151 | struct md_rdev *rdev; |
a654b9d8 | 152 | sector_t target; |
a654b9d8 | 153 | |
dafb20fa | 154 | rdev_for_each(rdev, mddev) { |
b2d444d7 N |
155 | if (! test_bit(In_sync, &rdev->flags) |
156 | || test_bit(Faulty, &rdev->flags)) | |
ab904d63 N |
157 | continue; |
158 | ||
ccebd4c4 | 159 | target = offset + index * (PAGE_SIZE/512); |
a654b9d8 | 160 | |
2b193363 | 161 | if (sync_page_io(rdev, target, |
e1defc4f | 162 | roundup(size, bdev_logical_block_size(rdev->bdev)), |
ccebd4c4 | 163 | page, READ, true)) { |
ab904d63 | 164 | page->index = index; |
27581e5a | 165 | return 0; |
ab904d63 N |
166 | } |
167 | } | |
27581e5a | 168 | return -EIO; |
a654b9d8 N |
169 | } |
170 | ||
fd01b88c | 171 | static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) |
b2d2c4ce N |
172 | { |
173 | /* Iterate the disks of an mddev, using rcu to protect access to the | |
174 | * linked list, and raising the refcount of devices we return to ensure | |
175 | * they don't disappear while in use. | |
176 | * As devices are only added or removed when raid_disk is < 0 and | |
177 | * nr_pending is 0 and In_sync is clear, the entries we return will | |
178 | * still be in the same position on the list when we re-enter | |
fd177481 | 179 | * list_for_each_entry_continue_rcu. |
8532e343 N |
180 | * |
181 | * Note that if entered with 'rdev == NULL' to start at the | |
182 | * beginning, we temporarily assign 'rdev' to an address which | |
183 | * isn't really an rdev, but which can be used by | |
184 | * list_for_each_entry_continue_rcu() to find the first entry. | |
b2d2c4ce | 185 | */ |
b2d2c4ce N |
186 | rcu_read_lock(); |
187 | if (rdev == NULL) | |
188 | /* start at the beginning */ | |
8532e343 | 189 | rdev = list_entry(&mddev->disks, struct md_rdev, same_set); |
b2d2c4ce N |
190 | else { |
191 | /* release the previous rdev and start from there. */ | |
192 | rdev_dec_pending(rdev, mddev); | |
b2d2c4ce | 193 | } |
fd177481 | 194 | list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) { |
b2d2c4ce | 195 | if (rdev->raid_disk >= 0 && |
b2d2c4ce N |
196 | !test_bit(Faulty, &rdev->flags)) { |
197 | /* this is a usable devices */ | |
198 | atomic_inc(&rdev->nr_pending); | |
199 | rcu_read_unlock(); | |
200 | return rdev; | |
201 | } | |
202 | } | |
203 | rcu_read_unlock(); | |
204 | return NULL; | |
205 | } | |
206 | ||
ab6085c7 | 207 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
a654b9d8 | 208 | { |
3cb03002 | 209 | struct md_rdev *rdev = NULL; |
a6ff7e08 | 210 | struct block_device *bdev; |
fd01b88c | 211 | struct mddev *mddev = bitmap->mddev; |
1ec885cd | 212 | struct bitmap_storage *store = &bitmap->storage; |
a654b9d8 | 213 | |
b2d2c4ce | 214 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
ac2f40be N |
215 | int size = PAGE_SIZE; |
216 | loff_t offset = mddev->bitmap_info.offset; | |
a6ff7e08 JB |
217 | |
218 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; | |
219 | ||
9b1215c1 N |
220 | if (page->index == store->file_pages-1) { |
221 | int last_page_size = store->bytes & (PAGE_SIZE-1); | |
222 | if (last_page_size == 0) | |
223 | last_page_size = PAGE_SIZE; | |
224 | size = roundup(last_page_size, | |
a6ff7e08 | 225 | bdev_logical_block_size(bdev)); |
9b1215c1 | 226 | } |
ac2f40be N |
227 | /* Just make sure we aren't corrupting data or |
228 | * metadata | |
229 | */ | |
230 | if (mddev->external) { | |
231 | /* Bitmap could be anywhere. */ | |
232 | if (rdev->sb_start + offset + (page->index | |
233 | * (PAGE_SIZE/512)) | |
234 | > rdev->data_offset | |
235 | && | |
236 | rdev->sb_start + offset | |
237 | < (rdev->data_offset + mddev->dev_sectors | |
238 | + (PAGE_SIZE/512))) | |
239 | goto bad_alignment; | |
240 | } else if (offset < 0) { | |
241 | /* DATA BITMAP METADATA */ | |
242 | if (offset | |
243 | + (long)(page->index * (PAGE_SIZE/512)) | |
244 | + size/512 > 0) | |
245 | /* bitmap runs in to metadata */ | |
246 | goto bad_alignment; | |
247 | if (rdev->data_offset + mddev->dev_sectors | |
248 | > rdev->sb_start + offset) | |
249 | /* data runs in to bitmap */ | |
250 | goto bad_alignment; | |
251 | } else if (rdev->sb_start < rdev->data_offset) { | |
252 | /* METADATA BITMAP DATA */ | |
253 | if (rdev->sb_start | |
254 | + offset | |
255 | + page->index*(PAGE_SIZE/512) + size/512 | |
256 | > rdev->data_offset) | |
257 | /* bitmap runs in to data */ | |
258 | goto bad_alignment; | |
259 | } else { | |
260 | /* DATA METADATA BITMAP - no problems */ | |
261 | } | |
262 | md_super_write(mddev, rdev, | |
263 | rdev->sb_start + offset | |
264 | + page->index * (PAGE_SIZE/512), | |
265 | size, | |
266 | page); | |
b2d2c4ce | 267 | } |
a654b9d8 N |
268 | |
269 | if (wait) | |
a9701a30 | 270 | md_super_wait(mddev); |
a654b9d8 | 271 | return 0; |
4b80991c N |
272 | |
273 | bad_alignment: | |
4b80991c | 274 | return -EINVAL; |
a654b9d8 N |
275 | } |
276 | ||
4ad13663 | 277 | static void bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 278 | /* |
a654b9d8 | 279 | * write out a page to a file |
32a7627c | 280 | */ |
4ad13663 | 281 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 282 | { |
d785a06a | 283 | struct buffer_head *bh; |
32a7627c | 284 | |
1ec885cd | 285 | if (bitmap->storage.file == NULL) { |
f0d76d70 N |
286 | switch (write_sb_page(bitmap, page, wait)) { |
287 | case -EINVAL: | |
b405fe91 | 288 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); |
f0d76d70 | 289 | } |
4ad13663 | 290 | } else { |
a654b9d8 | 291 | |
4ad13663 | 292 | bh = page_buffers(page); |
c708443c | 293 | |
4ad13663 N |
294 | while (bh && bh->b_blocknr) { |
295 | atomic_inc(&bitmap->pending_writes); | |
296 | set_buffer_locked(bh); | |
297 | set_buffer_mapped(bh); | |
721a9602 | 298 | submit_bh(WRITE | REQ_SYNC, bh); |
4ad13663 N |
299 | bh = bh->b_this_page; |
300 | } | |
d785a06a | 301 | |
ac2f40be | 302 | if (wait) |
4ad13663 N |
303 | wait_event(bitmap->write_wait, |
304 | atomic_read(&bitmap->pending_writes)==0); | |
8a5e9cf1 | 305 | } |
b405fe91 | 306 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
4ad13663 | 307 | bitmap_file_kick(bitmap); |
d785a06a N |
308 | } |
309 | ||
310 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
311 | { | |
312 | struct bitmap *bitmap = bh->b_private; | |
32a7627c | 313 | |
b405fe91 N |
314 | if (!uptodate) |
315 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); | |
d785a06a N |
316 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
317 | wake_up(&bitmap->write_wait); | |
318 | } | |
32a7627c | 319 | |
d785a06a N |
320 | /* copied from buffer.c */ |
321 | static void | |
322 | __clear_page_buffers(struct page *page) | |
323 | { | |
324 | ClearPagePrivate(page); | |
325 | set_page_private(page, 0); | |
326 | page_cache_release(page); | |
327 | } | |
328 | static void free_buffers(struct page *page) | |
329 | { | |
27581e5a | 330 | struct buffer_head *bh; |
77ad4bc7 | 331 | |
27581e5a N |
332 | if (!PagePrivate(page)) |
333 | return; | |
334 | ||
335 | bh = page_buffers(page); | |
d785a06a N |
336 | while (bh) { |
337 | struct buffer_head *next = bh->b_this_page; | |
338 | free_buffer_head(bh); | |
339 | bh = next; | |
77ad4bc7 | 340 | } |
d785a06a N |
341 | __clear_page_buffers(page); |
342 | put_page(page); | |
32a7627c N |
343 | } |
344 | ||
d785a06a N |
345 | /* read a page from a file. |
346 | * We both read the page, and attach buffers to the page to record the | |
347 | * address of each block (using bmap). These addresses will be used | |
348 | * to write the block later, completely bypassing the filesystem. | |
349 | * This usage is similar to how swap files are handled, and allows us | |
350 | * to write to a file with no concerns of memory allocation failing. | |
351 | */ | |
27581e5a N |
352 | static int read_page(struct file *file, unsigned long index, |
353 | struct bitmap *bitmap, | |
354 | unsigned long count, | |
355 | struct page *page) | |
32a7627c | 356 | { |
27581e5a | 357 | int ret = 0; |
496ad9aa | 358 | struct inode *inode = file_inode(file); |
d785a06a N |
359 | struct buffer_head *bh; |
360 | sector_t block; | |
32a7627c | 361 | |
36a4e1fe N |
362 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
363 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 364 | |
d785a06a N |
365 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
366 | if (!bh) { | |
27581e5a | 367 | ret = -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! */ | |
27581e5a | 379 | ret = -EINVAL; |
d785a06a N |
380 | goto out; |
381 | } | |
382 | bh->b_bdev = inode->i_sb->s_bdev; | |
383 | if (count < (1<<inode->i_blkbits)) | |
384 | count = 0; | |
385 | else | |
386 | count -= (1<<inode->i_blkbits); | |
387 | ||
388 | bh->b_end_io = end_bitmap_write; | |
389 | bh->b_private = bitmap; | |
ce25c31b N |
390 | atomic_inc(&bitmap->pending_writes); |
391 | set_buffer_locked(bh); | |
392 | set_buffer_mapped(bh); | |
393 | submit_bh(READ, bh); | |
d785a06a N |
394 | } |
395 | block++; | |
396 | bh = bh->b_this_page; | |
397 | } | |
d785a06a | 398 | page->index = index; |
ce25c31b N |
399 | |
400 | wait_event(bitmap->write_wait, | |
401 | atomic_read(&bitmap->pending_writes)==0); | |
b405fe91 | 402 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
27581e5a | 403 | ret = -EIO; |
32a7627c | 404 | out: |
27581e5a N |
405 | if (ret) |
406 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %d\n", | |
2d1f3b5d N |
407 | (int)PAGE_SIZE, |
408 | (unsigned long long)index << PAGE_SHIFT, | |
27581e5a N |
409 | ret); |
410 | return ret; | |
32a7627c N |
411 | } |
412 | ||
413 | /* | |
414 | * bitmap file superblock operations | |
415 | */ | |
416 | ||
417 | /* update the event counter and sync the superblock to disk */ | |
4ad13663 | 418 | void bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
419 | { |
420 | bitmap_super_t *sb; | |
32a7627c N |
421 | |
422 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 423 | return; |
ece5cff0 N |
424 | if (bitmap->mddev->bitmap_info.external) |
425 | return; | |
1ec885cd | 426 | if (!bitmap->storage.sb_page) /* no superblock */ |
4ad13663 | 427 | return; |
1ec885cd | 428 | sb = kmap_atomic(bitmap->storage.sb_page); |
32a7627c | 429 | sb->events = cpu_to_le64(bitmap->mddev->events); |
8258c532 | 430 | if (bitmap->mddev->events < bitmap->events_cleared) |
a0da84f3 NB |
431 | /* rocking back to read-only */ |
432 | bitmap->events_cleared = bitmap->mddev->events; | |
8258c532 N |
433 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
434 | sb->state = cpu_to_le32(bitmap->flags); | |
43a70507 N |
435 | /* Just in case these have been changed via sysfs: */ |
436 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
437 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
b81a0404 N |
438 | /* This might have been changed by a reshape */ |
439 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
440 | sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize); | |
c4ce867f | 441 | sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes); |
1dff2b87 N |
442 | sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> |
443 | bitmap_info.space); | |
b2f46e68 | 444 | kunmap_atomic(sb); |
1ec885cd | 445 | write_page(bitmap, bitmap->storage.sb_page, 1); |
32a7627c N |
446 | } |
447 | ||
448 | /* print out the bitmap file superblock */ | |
449 | void bitmap_print_sb(struct bitmap *bitmap) | |
450 | { | |
451 | bitmap_super_t *sb; | |
452 | ||
1ec885cd | 453 | if (!bitmap || !bitmap->storage.sb_page) |
32a7627c | 454 | return; |
1ec885cd | 455 | sb = kmap_atomic(bitmap->storage.sb_page); |
32a7627c | 456 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
457 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
458 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
459 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
460 | *(__u32 *)(sb->uuid+0), |
461 | *(__u32 *)(sb->uuid+4), | |
462 | *(__u32 *)(sb->uuid+8), | |
463 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 464 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 465 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 466 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 467 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
468 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
469 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
470 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
471 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
472 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 473 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
b2f46e68 | 474 | kunmap_atomic(sb); |
32a7627c N |
475 | } |
476 | ||
9c81075f JB |
477 | /* |
478 | * bitmap_new_disk_sb | |
479 | * @bitmap | |
480 | * | |
481 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb | |
482 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. | |
483 | * This function verifies 'bitmap_info' and populates the on-disk bitmap | |
484 | * structure, which is to be written to disk. | |
485 | * | |
486 | * Returns: 0 on success, -Exxx on error | |
487 | */ | |
488 | static int bitmap_new_disk_sb(struct bitmap *bitmap) | |
489 | { | |
490 | bitmap_super_t *sb; | |
491 | unsigned long chunksize, daemon_sleep, write_behind; | |
9c81075f | 492 | |
d3b178ad | 493 | bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
582e2e05 JM |
494 | if (bitmap->storage.sb_page == NULL) |
495 | return -ENOMEM; | |
1ec885cd | 496 | bitmap->storage.sb_page->index = 0; |
9c81075f | 497 | |
1ec885cd | 498 | sb = kmap_atomic(bitmap->storage.sb_page); |
9c81075f JB |
499 | |
500 | sb->magic = cpu_to_le32(BITMAP_MAGIC); | |
501 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); | |
502 | ||
503 | chunksize = bitmap->mddev->bitmap_info.chunksize; | |
504 | BUG_ON(!chunksize); | |
505 | if (!is_power_of_2(chunksize)) { | |
b2f46e68 | 506 | kunmap_atomic(sb); |
9c81075f JB |
507 | printk(KERN_ERR "bitmap chunksize not a power of 2\n"); |
508 | return -EINVAL; | |
509 | } | |
510 | sb->chunksize = cpu_to_le32(chunksize); | |
511 | ||
512 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; | |
513 | if (!daemon_sleep || | |
514 | (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { | |
515 | printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n"); | |
516 | daemon_sleep = 5 * HZ; | |
517 | } | |
518 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); | |
519 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
520 | ||
521 | /* | |
522 | * FIXME: write_behind for RAID1. If not specified, what | |
523 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. | |
524 | */ | |
525 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; | |
526 | if (write_behind > COUNTER_MAX) | |
527 | write_behind = COUNTER_MAX / 2; | |
528 | sb->write_behind = cpu_to_le32(write_behind); | |
529 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
530 | ||
531 | /* keep the array size field of the bitmap superblock up to date */ | |
532 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
533 | ||
534 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); | |
535 | ||
b405fe91 | 536 | set_bit(BITMAP_STALE, &bitmap->flags); |
84e92345 | 537 | sb->state = cpu_to_le32(bitmap->flags); |
9c81075f JB |
538 | bitmap->events_cleared = bitmap->mddev->events; |
539 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
d3b178ad | 540 | bitmap->mddev->bitmap_info.nodes = 0; |
9c81075f | 541 | |
b2f46e68 | 542 | kunmap_atomic(sb); |
9c81075f JB |
543 | |
544 | return 0; | |
545 | } | |
546 | ||
32a7627c N |
547 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
548 | static int bitmap_read_sb(struct bitmap *bitmap) | |
549 | { | |
550 | char *reason = NULL; | |
551 | bitmap_super_t *sb; | |
4b6d287f | 552 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c | 553 | unsigned long long events; |
c4ce867f | 554 | int nodes = 0; |
1dff2b87 | 555 | unsigned long sectors_reserved = 0; |
32a7627c | 556 | int err = -EINVAL; |
27581e5a | 557 | struct page *sb_page; |
33e38ac6 | 558 | loff_t offset = bitmap->mddev->bitmap_info.offset; |
32a7627c | 559 | |
1ec885cd | 560 | if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { |
ef99bf48 N |
561 | chunksize = 128 * 1024 * 1024; |
562 | daemon_sleep = 5 * HZ; | |
563 | write_behind = 0; | |
b405fe91 | 564 | set_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
565 | err = 0; |
566 | goto out_no_sb; | |
567 | } | |
32a7627c | 568 | /* page 0 is the superblock, read it... */ |
27581e5a N |
569 | sb_page = alloc_page(GFP_KERNEL); |
570 | if (!sb_page) | |
571 | return -ENOMEM; | |
1ec885cd | 572 | bitmap->storage.sb_page = sb_page; |
27581e5a | 573 | |
b97e9257 | 574 | re_read: |
f9209a32 GR |
575 | /* If cluster_slot is set, the cluster is setup */ |
576 | if (bitmap->cluster_slot >= 0) { | |
3b0e6aac | 577 | sector_t bm_blocks = bitmap->mddev->resync_max_sectors; |
f9209a32 | 578 | |
3b0e6aac SR |
579 | sector_div(bm_blocks, |
580 | bitmap->mddev->bitmap_info.chunksize >> 9); | |
124eb761 GR |
581 | /* bits to bytes */ |
582 | bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t); | |
583 | /* to 4k blocks */ | |
935f3d4f | 584 | bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096); |
33e38ac6 | 585 | offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3)); |
f9209a32 | 586 | pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__, |
33e38ac6 | 587 | bitmap->cluster_slot, offset); |
f9209a32 GR |
588 | } |
589 | ||
1ec885cd N |
590 | if (bitmap->storage.file) { |
591 | loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); | |
f49d5e62 N |
592 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
593 | ||
1ec885cd | 594 | err = read_page(bitmap->storage.file, 0, |
27581e5a | 595 | bitmap, bytes, sb_page); |
f49d5e62 | 596 | } else { |
27581e5a | 597 | err = read_sb_page(bitmap->mddev, |
33e38ac6 | 598 | offset, |
27581e5a N |
599 | sb_page, |
600 | 0, sizeof(bitmap_super_t)); | |
a654b9d8 | 601 | } |
27581e5a | 602 | if (err) |
32a7627c | 603 | return err; |
32a7627c | 604 | |
b97e9257 | 605 | err = -EINVAL; |
27581e5a | 606 | sb = kmap_atomic(sb_page); |
32a7627c | 607 | |
32a7627c | 608 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 609 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 610 | write_behind = le32_to_cpu(sb->write_behind); |
1dff2b87 | 611 | sectors_reserved = le32_to_cpu(sb->sectors_reserved); |
3c462c88 GR |
612 | /* Setup nodes/clustername only if bitmap version is |
613 | * cluster-compatible | |
d3b178ad | 614 | */ |
3c462c88 | 615 | if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) { |
d3b178ad GR |
616 | nodes = le32_to_cpu(sb->nodes); |
617 | strlcpy(bitmap->mddev->bitmap_info.cluster_name, | |
618 | sb->cluster_name, 64); | |
619 | } | |
32a7627c N |
620 | |
621 | /* verify that the bitmap-specific fields are valid */ | |
622 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
623 | reason = "bad magic"; | |
bd926c63 | 624 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
3c462c88 | 625 | le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED) |
32a7627c | 626 | reason = "unrecognized superblock version"; |
1187cf0a | 627 | else if (chunksize < 512) |
7dd5d34c | 628 | reason = "bitmap chunksize too small"; |
d744540c | 629 | else if (!is_power_of_2(chunksize)) |
32a7627c | 630 | reason = "bitmap chunksize not a power of 2"; |
1b04be96 | 631 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 632 | reason = "daemon sleep period out of range"; |
4b6d287f N |
633 | else if (write_behind > COUNTER_MAX) |
634 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
635 | if (reason) { |
636 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
637 | bmname(bitmap), reason); | |
638 | goto out; | |
639 | } | |
640 | ||
641 | /* keep the array size field of the bitmap superblock up to date */ | |
642 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
643 | ||
278c1ca2 N |
644 | if (bitmap->mddev->persistent) { |
645 | /* | |
646 | * We have a persistent array superblock, so compare the | |
647 | * bitmap's UUID and event counter to the mddev's | |
648 | */ | |
649 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
650 | printk(KERN_INFO | |
651 | "%s: bitmap superblock UUID mismatch\n", | |
652 | bmname(bitmap)); | |
653 | goto out; | |
654 | } | |
655 | events = le64_to_cpu(sb->events); | |
b97e9257 | 656 | if (!nodes && (events < bitmap->mddev->events)) { |
278c1ca2 N |
657 | printk(KERN_INFO |
658 | "%s: bitmap file is out of date (%llu < %llu) " | |
659 | "-- forcing full recovery\n", | |
660 | bmname(bitmap), events, | |
661 | (unsigned long long) bitmap->mddev->events); | |
b405fe91 | 662 | set_bit(BITMAP_STALE, &bitmap->flags); |
278c1ca2 | 663 | } |
32a7627c | 664 | } |
278c1ca2 | 665 | |
32a7627c | 666 | /* assign fields using values from superblock */ |
4f2e639a | 667 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 | 668 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
b405fe91 | 669 | set_bit(BITMAP_HOSTENDIAN, &bitmap->flags); |
32a7627c | 670 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
cf921cc1 | 671 | strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64); |
32a7627c | 672 | err = 0; |
b97e9257 | 673 | |
32a7627c | 674 | out: |
b2f46e68 | 675 | kunmap_atomic(sb); |
f9209a32 GR |
676 | /* Assiging chunksize is required for "re_read" */ |
677 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
f7357273 | 678 | if (err == 0 && nodes && (bitmap->cluster_slot < 0)) { |
b97e9257 GR |
679 | err = md_setup_cluster(bitmap->mddev, nodes); |
680 | if (err) { | |
681 | pr_err("%s: Could not setup cluster service (%d)\n", | |
682 | bmname(bitmap), err); | |
683 | goto out_no_sb; | |
684 | } | |
685 | bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev); | |
b97e9257 GR |
686 | goto re_read; |
687 | } | |
688 | ||
689 | ||
ef99bf48 | 690 | out_no_sb: |
b405fe91 | 691 | if (test_bit(BITMAP_STALE, &bitmap->flags)) |
ef99bf48 N |
692 | bitmap->events_cleared = bitmap->mddev->events; |
693 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
694 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
695 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
c4ce867f | 696 | bitmap->mddev->bitmap_info.nodes = nodes; |
1dff2b87 N |
697 | if (bitmap->mddev->bitmap_info.space == 0 || |
698 | bitmap->mddev->bitmap_info.space > sectors_reserved) | |
699 | bitmap->mddev->bitmap_info.space = sectors_reserved; | |
b97e9257 | 700 | if (err) { |
32a7627c | 701 | bitmap_print_sb(bitmap); |
f9209a32 | 702 | if (bitmap->cluster_slot < 0) |
b97e9257 GR |
703 | md_cluster_stop(bitmap->mddev); |
704 | } | |
32a7627c N |
705 | return err; |
706 | } | |
707 | ||
32a7627c N |
708 | /* |
709 | * general bitmap file operations | |
710 | */ | |
711 | ||
ece5cff0 N |
712 | /* |
713 | * on-disk bitmap: | |
714 | * | |
715 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
716 | * file a page at a time. There's a superblock at the start of the file. | |
717 | */ | |
32a7627c | 718 | /* calculate the index of the page that contains this bit */ |
1ec885cd N |
719 | static inline unsigned long file_page_index(struct bitmap_storage *store, |
720 | unsigned long chunk) | |
32a7627c | 721 | { |
1ec885cd | 722 | if (store->sb_page) |
ece5cff0 N |
723 | chunk += sizeof(bitmap_super_t) << 3; |
724 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
725 | } |
726 | ||
727 | /* calculate the (bit) offset of this bit within a page */ | |
1ec885cd N |
728 | static inline unsigned long file_page_offset(struct bitmap_storage *store, |
729 | unsigned long chunk) | |
32a7627c | 730 | { |
1ec885cd | 731 | if (store->sb_page) |
ece5cff0 N |
732 | chunk += sizeof(bitmap_super_t) << 3; |
733 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
734 | } |
735 | ||
736 | /* | |
737 | * return a pointer to the page in the filemap that contains the given bit | |
738 | * | |
32a7627c | 739 | */ |
1ec885cd | 740 | static inline struct page *filemap_get_page(struct bitmap_storage *store, |
3520fa4d | 741 | unsigned long chunk) |
32a7627c | 742 | { |
1ec885cd | 743 | if (file_page_index(store, chunk) >= store->file_pages) |
ac2f40be | 744 | return NULL; |
f2e06c58 | 745 | return store->filemap[file_page_index(store, chunk)]; |
32a7627c N |
746 | } |
747 | ||
d1244cb0 | 748 | static int bitmap_storage_alloc(struct bitmap_storage *store, |
b97e9257 GR |
749 | unsigned long chunks, int with_super, |
750 | int slot_number) | |
d1244cb0 | 751 | { |
b97e9257 | 752 | int pnum, offset = 0; |
d1244cb0 N |
753 | unsigned long num_pages; |
754 | unsigned long bytes; | |
755 | ||
756 | bytes = DIV_ROUND_UP(chunks, 8); | |
757 | if (with_super) | |
758 | bytes += sizeof(bitmap_super_t); | |
759 | ||
760 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); | |
b97e9257 | 761 | offset = slot_number * (num_pages - 1); |
d1244cb0 N |
762 | |
763 | store->filemap = kmalloc(sizeof(struct page *) | |
764 | * num_pages, GFP_KERNEL); | |
765 | if (!store->filemap) | |
766 | return -ENOMEM; | |
767 | ||
768 | if (with_super && !store->sb_page) { | |
d60b479d | 769 | store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
770 | if (store->sb_page == NULL) |
771 | return -ENOMEM; | |
d1244cb0 | 772 | } |
b97e9257 | 773 | |
d1244cb0 N |
774 | pnum = 0; |
775 | if (store->sb_page) { | |
776 | store->filemap[0] = store->sb_page; | |
777 | pnum = 1; | |
b97e9257 | 778 | store->sb_page->index = offset; |
d1244cb0 | 779 | } |
b97e9257 | 780 | |
d1244cb0 | 781 | for ( ; pnum < num_pages; pnum++) { |
d60b479d | 782 | store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
783 | if (!store->filemap[pnum]) { |
784 | store->file_pages = pnum; | |
785 | return -ENOMEM; | |
786 | } | |
b97e9257 | 787 | store->filemap[pnum]->index = pnum + offset; |
d1244cb0 N |
788 | } |
789 | store->file_pages = pnum; | |
790 | ||
791 | /* We need 4 bits per page, rounded up to a multiple | |
792 | * of sizeof(unsigned long) */ | |
793 | store->filemap_attr = kzalloc( | |
794 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), | |
795 | GFP_KERNEL); | |
796 | if (!store->filemap_attr) | |
797 | return -ENOMEM; | |
798 | ||
799 | store->bytes = bytes; | |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
fae7d326 | 804 | static void bitmap_file_unmap(struct bitmap_storage *store) |
32a7627c N |
805 | { |
806 | struct page **map, *sb_page; | |
32a7627c | 807 | int pages; |
fae7d326 | 808 | struct file *file; |
32a7627c | 809 | |
fae7d326 | 810 | file = store->file; |
1ec885cd | 811 | map = store->filemap; |
1ec885cd | 812 | pages = store->file_pages; |
1ec885cd | 813 | sb_page = store->sb_page; |
32a7627c N |
814 | |
815 | while (pages--) | |
ece5cff0 | 816 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 817 | free_buffers(map[pages]); |
32a7627c | 818 | kfree(map); |
fae7d326 | 819 | kfree(store->filemap_attr); |
32a7627c | 820 | |
d785a06a N |
821 | if (sb_page) |
822 | free_buffers(sb_page); | |
32a7627c | 823 | |
d785a06a | 824 | if (file) { |
496ad9aa | 825 | struct inode *inode = file_inode(file); |
fc0ecff6 | 826 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 827 | fput(file); |
d785a06a | 828 | } |
32a7627c N |
829 | } |
830 | ||
32a7627c N |
831 | /* |
832 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
833 | * then it is no longer reliable, so we stop using it and we mark the file | |
834 | * as failed in the superblock | |
835 | */ | |
836 | static void bitmap_file_kick(struct bitmap *bitmap) | |
837 | { | |
838 | char *path, *ptr = NULL; | |
839 | ||
b405fe91 | 840 | if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) { |
4ad13663 | 841 | bitmap_update_sb(bitmap); |
32a7627c | 842 | |
1ec885cd | 843 | if (bitmap->storage.file) { |
4ad13663 N |
844 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
845 | if (path) | |
9bf39ab2 | 846 | ptr = file_path(bitmap->storage.file, |
1ec885cd | 847 | path, PAGE_SIZE); |
6bcfd601 | 848 | |
4ad13663 N |
849 | printk(KERN_ALERT |
850 | "%s: kicking failed bitmap file %s from array!\n", | |
6bcfd601 | 851 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
32a7627c | 852 | |
4ad13663 N |
853 | kfree(path); |
854 | } else | |
855 | printk(KERN_ALERT | |
856 | "%s: disabling internal bitmap due to errors\n", | |
857 | bmname(bitmap)); | |
a654b9d8 | 858 | } |
32a7627c N |
859 | } |
860 | ||
861 | enum bitmap_page_attr { | |
ac2f40be | 862 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
5a537df4 N |
863 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
864 | * i.e. counter is 1 or 2. */ | |
ac2f40be | 865 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
32a7627c N |
866 | }; |
867 | ||
d189122d N |
868 | static inline void set_page_attr(struct bitmap *bitmap, int pnum, |
869 | enum bitmap_page_attr attr) | |
32a7627c | 870 | { |
bdfd1140 | 871 | set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
872 | } |
873 | ||
d189122d N |
874 | static inline void clear_page_attr(struct bitmap *bitmap, int pnum, |
875 | enum bitmap_page_attr attr) | |
32a7627c | 876 | { |
bdfd1140 | 877 | clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
878 | } |
879 | ||
bdfd1140 N |
880 | static inline int test_page_attr(struct bitmap *bitmap, int pnum, |
881 | enum bitmap_page_attr attr) | |
32a7627c | 882 | { |
1ec885cd | 883 | return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
884 | } |
885 | ||
bdfd1140 N |
886 | static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum, |
887 | enum bitmap_page_attr attr) | |
888 | { | |
889 | return test_and_clear_bit((pnum<<2) + attr, | |
890 | bitmap->storage.filemap_attr); | |
891 | } | |
32a7627c N |
892 | /* |
893 | * bitmap_file_set_bit -- called before performing a write to the md device | |
894 | * to set (and eventually sync) a particular bit in the bitmap file | |
895 | * | |
896 | * we set the bit immediately, then we record the page number so that | |
897 | * when an unplug occurs, we can flush the dirty pages out to disk | |
898 | */ | |
899 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
900 | { | |
901 | unsigned long bit; | |
3520fa4d | 902 | struct page *page; |
32a7627c | 903 | void *kaddr; |
40cffcc0 | 904 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
32a7627c | 905 | |
1ec885cd | 906 | page = filemap_get_page(&bitmap->storage, chunk); |
3520fa4d JB |
907 | if (!page) |
908 | return; | |
1ec885cd | 909 | bit = file_page_offset(&bitmap->storage, chunk); |
32a7627c | 910 | |
3520fa4d | 911 | /* set the bit */ |
b2f46e68 | 912 | kaddr = kmap_atomic(page); |
b405fe91 | 913 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
3520fa4d JB |
914 | set_bit(bit, kaddr); |
915 | else | |
3f810b6c | 916 | set_bit_le(bit, kaddr); |
b2f46e68 | 917 | kunmap_atomic(kaddr); |
36a4e1fe | 918 | pr_debug("set file bit %lu page %lu\n", bit, page->index); |
32a7627c | 919 | /* record page number so it gets flushed to disk when unplug occurs */ |
d189122d | 920 | set_page_attr(bitmap, page->index, BITMAP_PAGE_DIRTY); |
32a7627c N |
921 | } |
922 | ||
ef99bf48 N |
923 | static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) |
924 | { | |
925 | unsigned long bit; | |
926 | struct page *page; | |
927 | void *paddr; | |
40cffcc0 | 928 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
ef99bf48 | 929 | |
1ec885cd | 930 | page = filemap_get_page(&bitmap->storage, chunk); |
ef99bf48 N |
931 | if (!page) |
932 | return; | |
1ec885cd | 933 | bit = file_page_offset(&bitmap->storage, chunk); |
ef99bf48 | 934 | paddr = kmap_atomic(page); |
b405fe91 | 935 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
ef99bf48 N |
936 | clear_bit(bit, paddr); |
937 | else | |
3f810b6c | 938 | clear_bit_le(bit, paddr); |
ef99bf48 | 939 | kunmap_atomic(paddr); |
d189122d N |
940 | if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) { |
941 | set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING); | |
ef99bf48 N |
942 | bitmap->allclean = 0; |
943 | } | |
944 | } | |
945 | ||
11dd35da GR |
946 | static int bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) |
947 | { | |
948 | unsigned long bit; | |
949 | struct page *page; | |
950 | void *paddr; | |
951 | unsigned long chunk = block >> bitmap->counts.chunkshift; | |
952 | int set = 0; | |
953 | ||
954 | page = filemap_get_page(&bitmap->storage, chunk); | |
955 | if (!page) | |
956 | return -EINVAL; | |
957 | bit = file_page_offset(&bitmap->storage, chunk); | |
958 | paddr = kmap_atomic(page); | |
959 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) | |
960 | set = test_bit(bit, paddr); | |
961 | else | |
962 | set = test_bit_le(bit, paddr); | |
963 | kunmap_atomic(paddr); | |
964 | return set; | |
965 | } | |
966 | ||
967 | ||
32a7627c N |
968 | /* this gets called when the md device is ready to unplug its underlying |
969 | * (slave) device queues -- before we let any writes go down, we need to | |
970 | * sync the dirty pages of the bitmap file to disk */ | |
4ad13663 | 971 | void bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 972 | { |
74667123 | 973 | unsigned long i; |
ec7a3197 | 974 | int dirty, need_write; |
32a7627c | 975 | |
62f82faa N |
976 | if (!bitmap || !bitmap->storage.filemap || |
977 | test_bit(BITMAP_STALE, &bitmap->flags)) | |
4ad13663 | 978 | return; |
32a7627c N |
979 | |
980 | /* look at each page to see if there are any set bits that need to be | |
981 | * flushed out to disk */ | |
1ec885cd | 982 | for (i = 0; i < bitmap->storage.file_pages; i++) { |
bdfd1140 | 983 | if (!bitmap->storage.filemap) |
4ad13663 | 984 | return; |
bdfd1140 N |
985 | dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
986 | need_write = test_and_clear_page_attr(bitmap, i, | |
987 | BITMAP_PAGE_NEEDWRITE); | |
988 | if (dirty || need_write) { | |
d189122d | 989 | clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); |
bdfd1140 N |
990 | write_page(bitmap, bitmap->storage.filemap[i], 0); |
991 | } | |
32a7627c | 992 | } |
4b5060dd N |
993 | if (bitmap->storage.file) |
994 | wait_event(bitmap->write_wait, | |
995 | atomic_read(&bitmap->pending_writes)==0); | |
996 | else | |
997 | md_super_wait(bitmap->mddev); | |
998 | ||
b405fe91 | 999 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
d785a06a | 1000 | bitmap_file_kick(bitmap); |
32a7627c | 1001 | } |
ac2f40be | 1002 | EXPORT_SYMBOL(bitmap_unplug); |
32a7627c | 1003 | |
6a07997f | 1004 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
1005 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
1006 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
1007 | * memory mapping of the bitmap file | |
1008 | * Special cases: | |
1009 | * if there's no bitmap file, or if the bitmap file had been | |
1010 | * previously kicked from the array, we mark all the bits as | |
1011 | * 1's in order to cause a full resync. | |
6a07997f N |
1012 | * |
1013 | * We ignore all bits for sectors that end earlier than 'start'. | |
1014 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 1015 | */ |
6a07997f | 1016 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c | 1017 | { |
b97e9257 | 1018 | unsigned long i, chunks, index, oldindex, bit, node_offset = 0; |
27581e5a | 1019 | struct page *page = NULL; |
d1244cb0 | 1020 | unsigned long bit_cnt = 0; |
32a7627c | 1021 | struct file *file; |
d1244cb0 | 1022 | unsigned long offset; |
32a7627c N |
1023 | int outofdate; |
1024 | int ret = -ENOSPC; | |
ea03aff9 | 1025 | void *paddr; |
1ec885cd | 1026 | struct bitmap_storage *store = &bitmap->storage; |
32a7627c | 1027 | |
40cffcc0 | 1028 | chunks = bitmap->counts.chunks; |
1ec885cd | 1029 | file = store->file; |
32a7627c | 1030 | |
ef99bf48 N |
1031 | if (!file && !bitmap->mddev->bitmap_info.offset) { |
1032 | /* No permanent bitmap - fill with '1s'. */ | |
1ec885cd N |
1033 | store->filemap = NULL; |
1034 | store->file_pages = 0; | |
ef99bf48 N |
1035 | for (i = 0; i < chunks ; i++) { |
1036 | /* if the disk bit is set, set the memory bit */ | |
40cffcc0 | 1037 | int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift) |
ef99bf48 N |
1038 | >= start); |
1039 | bitmap_set_memory_bits(bitmap, | |
40cffcc0 | 1040 | (sector_t)i << bitmap->counts.chunkshift, |
ef99bf48 N |
1041 | needed); |
1042 | } | |
1043 | return 0; | |
1044 | } | |
32a7627c | 1045 | |
b405fe91 | 1046 | outofdate = test_bit(BITMAP_STALE, &bitmap->flags); |
32a7627c N |
1047 | if (outofdate) |
1048 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
1049 | "recovery\n", bmname(bitmap)); | |
1050 | ||
d1244cb0 | 1051 | if (file && i_size_read(file->f_mapping->host) < store->bytes) { |
32a7627c | 1052 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
d1244cb0 N |
1053 | bmname(bitmap), |
1054 | (unsigned long) i_size_read(file->f_mapping->host), | |
1055 | store->bytes); | |
4ad13663 | 1056 | goto err; |
32a7627c | 1057 | } |
bc7f77de | 1058 | |
d1244cb0 | 1059 | oldindex = ~0L; |
27581e5a | 1060 | offset = 0; |
d1244cb0 | 1061 | if (!bitmap->mddev->bitmap_info.external) |
27581e5a | 1062 | offset = sizeof(bitmap_super_t); |
32a7627c | 1063 | |
b97e9257 GR |
1064 | if (mddev_is_clustered(bitmap->mddev)) |
1065 | node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE)); | |
1066 | ||
32a7627c | 1067 | for (i = 0; i < chunks; i++) { |
bd926c63 | 1068 | int b; |
1ec885cd N |
1069 | index = file_page_index(&bitmap->storage, i); |
1070 | bit = file_page_offset(&bitmap->storage, i); | |
32a7627c | 1071 | if (index != oldindex) { /* this is a new page, read it in */ |
d785a06a | 1072 | int count; |
32a7627c | 1073 | /* unmap the old page, we're done with it */ |
d1244cb0 N |
1074 | if (index == store->file_pages-1) |
1075 | count = store->bytes - index * PAGE_SIZE; | |
d785a06a N |
1076 | else |
1077 | count = PAGE_SIZE; | |
1ec885cd | 1078 | page = store->filemap[index]; |
27581e5a N |
1079 | if (file) |
1080 | ret = read_page(file, index, bitmap, | |
1081 | count, page); | |
1082 | else | |
1083 | ret = read_sb_page( | |
1084 | bitmap->mddev, | |
1085 | bitmap->mddev->bitmap_info.offset, | |
1086 | page, | |
b97e9257 | 1087 | index + node_offset, count); |
27581e5a N |
1088 | |
1089 | if (ret) | |
4ad13663 | 1090 | goto err; |
a654b9d8 | 1091 | |
32a7627c | 1092 | oldindex = index; |
32a7627c N |
1093 | |
1094 | if (outofdate) { | |
1095 | /* | |
1096 | * if bitmap is out of date, dirty the | |
ac2f40be | 1097 | * whole page and write it out |
32a7627c | 1098 | */ |
b2f46e68 | 1099 | paddr = kmap_atomic(page); |
ea03aff9 | 1100 | memset(paddr + offset, 0xff, |
6a07997f | 1101 | PAGE_SIZE - offset); |
b2f46e68 | 1102 | kunmap_atomic(paddr); |
4ad13663 N |
1103 | write_page(bitmap, page, 1); |
1104 | ||
1105 | ret = -EIO; | |
b405fe91 N |
1106 | if (test_bit(BITMAP_WRITE_ERROR, |
1107 | &bitmap->flags)) | |
4ad13663 | 1108 | goto err; |
32a7627c | 1109 | } |
32a7627c | 1110 | } |
b2f46e68 | 1111 | paddr = kmap_atomic(page); |
b405fe91 | 1112 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
ea03aff9 | 1113 | b = test_bit(bit, paddr); |
bd926c63 | 1114 | else |
6b33aff3 | 1115 | b = test_bit_le(bit, paddr); |
b2f46e68 | 1116 | kunmap_atomic(paddr); |
bd926c63 | 1117 | if (b) { |
32a7627c | 1118 | /* if the disk bit is set, set the memory bit */ |
40cffcc0 | 1119 | int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift |
db305e50 N |
1120 | >= start); |
1121 | bitmap_set_memory_bits(bitmap, | |
40cffcc0 | 1122 | (sector_t)i << bitmap->counts.chunkshift, |
db305e50 | 1123 | needed); |
32a7627c N |
1124 | bit_cnt++; |
1125 | } | |
27581e5a | 1126 | offset = 0; |
32a7627c N |
1127 | } |
1128 | ||
32a7627c | 1129 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
d1244cb0 | 1130 | "read %lu pages, set %lu of %lu bits\n", |
1ec885cd | 1131 | bmname(bitmap), store->file_pages, |
d1244cb0 | 1132 | bit_cnt, chunks); |
4ad13663 N |
1133 | |
1134 | return 0; | |
32a7627c | 1135 | |
4ad13663 N |
1136 | err: |
1137 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", | |
1138 | bmname(bitmap), ret); | |
32a7627c N |
1139 | return ret; |
1140 | } | |
1141 | ||
a654b9d8 N |
1142 | void bitmap_write_all(struct bitmap *bitmap) |
1143 | { | |
1144 | /* We don't actually write all bitmap blocks here, | |
1145 | * just flag them as needing to be written | |
1146 | */ | |
ec7a3197 | 1147 | int i; |
a654b9d8 | 1148 | |
1ec885cd | 1149 | if (!bitmap || !bitmap->storage.filemap) |
ef99bf48 | 1150 | return; |
1ec885cd | 1151 | if (bitmap->storage.file) |
ef99bf48 N |
1152 | /* Only one copy, so nothing needed */ |
1153 | return; | |
1154 | ||
1ec885cd | 1155 | for (i = 0; i < bitmap->storage.file_pages; i++) |
d189122d | 1156 | set_page_attr(bitmap, i, |
ec7a3197 | 1157 | BITMAP_PAGE_NEEDWRITE); |
2585f3ef | 1158 | bitmap->allclean = 0; |
a654b9d8 N |
1159 | } |
1160 | ||
40cffcc0 N |
1161 | static void bitmap_count_page(struct bitmap_counts *bitmap, |
1162 | sector_t offset, int inc) | |
32a7627c | 1163 | { |
61a0d80c | 1164 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1165 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1166 | bitmap->bp[page].count += inc; | |
32a7627c N |
1167 | bitmap_checkfree(bitmap, page); |
1168 | } | |
bf07bb7d | 1169 | |
40cffcc0 | 1170 | static void bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset) |
bf07bb7d N |
1171 | { |
1172 | sector_t chunk = offset >> bitmap->chunkshift; | |
1173 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1174 | struct bitmap_page *bp = &bitmap->bp[page]; | |
1175 | ||
1176 | if (!bp->pending) | |
1177 | bp->pending = 1; | |
1178 | } | |
1179 | ||
40cffcc0 | 1180 | static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, |
57dab0bd | 1181 | sector_t offset, sector_t *blocks, |
32a7627c N |
1182 | int create); |
1183 | ||
1184 | /* | |
1185 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1186 | * out to disk | |
1187 | */ | |
1188 | ||
fd01b88c | 1189 | void bitmap_daemon_work(struct mddev *mddev) |
32a7627c | 1190 | { |
aa5cbd10 | 1191 | struct bitmap *bitmap; |
aa3163f8 | 1192 | unsigned long j; |
bf07bb7d | 1193 | unsigned long nextpage; |
57dab0bd | 1194 | sector_t blocks; |
40cffcc0 | 1195 | struct bitmap_counts *counts; |
32a7627c | 1196 | |
aa5cbd10 N |
1197 | /* Use a mutex to guard daemon_work against |
1198 | * bitmap_destroy. | |
1199 | */ | |
c3d9714e | 1200 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1201 | bitmap = mddev->bitmap; |
1202 | if (bitmap == NULL) { | |
c3d9714e | 1203 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1204 | return; |
aa5cbd10 | 1205 | } |
42a04b50 | 1206 | if (time_before(jiffies, bitmap->daemon_lastrun |
2e61ebbc | 1207 | + mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1208 | goto done; |
1209 | ||
32a7627c | 1210 | bitmap->daemon_lastrun = jiffies; |
8311c29d | 1211 | if (bitmap->allclean) { |
2e61ebbc | 1212 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
aa5cbd10 | 1213 | goto done; |
8311c29d N |
1214 | } |
1215 | bitmap->allclean = 1; | |
32a7627c | 1216 | |
bf07bb7d N |
1217 | /* Any file-page which is PENDING now needs to be written. |
1218 | * So set NEEDWRITE now, then after we make any last-minute changes | |
1219 | * we will write it. | |
1220 | */ | |
1ec885cd | 1221 | for (j = 0; j < bitmap->storage.file_pages; j++) |
bdfd1140 N |
1222 | if (test_and_clear_page_attr(bitmap, j, |
1223 | BITMAP_PAGE_PENDING)) | |
d189122d | 1224 | set_page_attr(bitmap, j, |
bf07bb7d | 1225 | BITMAP_PAGE_NEEDWRITE); |
bf07bb7d N |
1226 | |
1227 | if (bitmap->need_sync && | |
1228 | mddev->bitmap_info.external == 0) { | |
1229 | /* Arrange for superblock update as well as | |
1230 | * other changes */ | |
1231 | bitmap_super_t *sb; | |
1232 | bitmap->need_sync = 0; | |
1ec885cd N |
1233 | if (bitmap->storage.filemap) { |
1234 | sb = kmap_atomic(bitmap->storage.sb_page); | |
ef99bf48 N |
1235 | sb->events_cleared = |
1236 | cpu_to_le64(bitmap->events_cleared); | |
1237 | kunmap_atomic(sb); | |
d189122d | 1238 | set_page_attr(bitmap, 0, |
ef99bf48 N |
1239 | BITMAP_PAGE_NEEDWRITE); |
1240 | } | |
bf07bb7d N |
1241 | } |
1242 | /* Now look at the bitmap counters and if any are '2' or '1', | |
1243 | * decrement and handle accordingly. | |
1244 | */ | |
40cffcc0 N |
1245 | counts = &bitmap->counts; |
1246 | spin_lock_irq(&counts->lock); | |
bf07bb7d | 1247 | nextpage = 0; |
40cffcc0 | 1248 | for (j = 0; j < counts->chunks; j++) { |
32a7627c | 1249 | bitmap_counter_t *bmc; |
40cffcc0 | 1250 | sector_t block = (sector_t)j << counts->chunkshift; |
3520fa4d | 1251 | |
bf07bb7d N |
1252 | if (j == nextpage) { |
1253 | nextpage += PAGE_COUNTER_RATIO; | |
40cffcc0 | 1254 | if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) { |
bf07bb7d | 1255 | j |= PAGE_COUNTER_MASK; |
aa3163f8 N |
1256 | continue; |
1257 | } | |
40cffcc0 | 1258 | counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; |
32a7627c | 1259 | } |
40cffcc0 | 1260 | bmc = bitmap_get_counter(counts, |
ef99bf48 | 1261 | block, |
db305e50 | 1262 | &blocks, 0); |
bf07bb7d N |
1263 | |
1264 | if (!bmc) { | |
5a537df4 | 1265 | j |= PAGE_COUNTER_MASK; |
bf07bb7d N |
1266 | continue; |
1267 | } | |
1268 | if (*bmc == 1 && !bitmap->need_sync) { | |
1269 | /* We can clear the bit */ | |
bf07bb7d | 1270 | *bmc = 0; |
40cffcc0 | 1271 | bitmap_count_page(counts, block, -1); |
ef99bf48 | 1272 | bitmap_file_clear_bit(bitmap, block); |
bf07bb7d N |
1273 | } else if (*bmc && *bmc <= 2) { |
1274 | *bmc = 1; | |
40cffcc0 | 1275 | bitmap_set_pending(counts, block); |
bf07bb7d | 1276 | bitmap->allclean = 0; |
5a537df4 | 1277 | } |
32a7627c | 1278 | } |
40cffcc0 | 1279 | spin_unlock_irq(&counts->lock); |
32a7627c | 1280 | |
bf07bb7d N |
1281 | /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. |
1282 | * DIRTY pages need to be written by bitmap_unplug so it can wait | |
1283 | * for them. | |
1284 | * If we find any DIRTY page we stop there and let bitmap_unplug | |
1285 | * handle all the rest. This is important in the case where | |
1286 | * the first blocking holds the superblock and it has been updated. | |
1287 | * We mustn't write any other blocks before the superblock. | |
1288 | */ | |
62f82faa N |
1289 | for (j = 0; |
1290 | j < bitmap->storage.file_pages | |
1291 | && !test_bit(BITMAP_STALE, &bitmap->flags); | |
1292 | j++) { | |
d189122d | 1293 | if (test_page_attr(bitmap, j, |
bf07bb7d N |
1294 | BITMAP_PAGE_DIRTY)) |
1295 | /* bitmap_unplug will handle the rest */ | |
1296 | break; | |
bdfd1140 N |
1297 | if (test_and_clear_page_attr(bitmap, j, |
1298 | BITMAP_PAGE_NEEDWRITE)) { | |
1ec885cd | 1299 | write_page(bitmap, bitmap->storage.filemap[j], 0); |
32a7627c | 1300 | } |
32a7627c N |
1301 | } |
1302 | ||
7be3dfec | 1303 | done: |
8311c29d | 1304 | if (bitmap->allclean == 0) |
2e61ebbc N |
1305 | mddev->thread->timeout = |
1306 | mddev->bitmap_info.daemon_sleep; | |
c3d9714e | 1307 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1308 | } |
1309 | ||
40cffcc0 | 1310 | static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, |
57dab0bd | 1311 | sector_t offset, sector_t *blocks, |
32a7627c | 1312 | int create) |
ee305ace N |
1313 | __releases(bitmap->lock) |
1314 | __acquires(bitmap->lock) | |
32a7627c N |
1315 | { |
1316 | /* If 'create', we might release the lock and reclaim it. | |
1317 | * The lock must have been taken with interrupts enabled. | |
1318 | * If !create, we don't release the lock. | |
1319 | */ | |
61a0d80c | 1320 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1321 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1322 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1323 | sector_t csize; | |
ef425673 | 1324 | int err; |
32a7627c | 1325 | |
ef425673 N |
1326 | err = bitmap_checkpage(bitmap, page, create); |
1327 | ||
1328 | if (bitmap->bp[page].hijacked || | |
1329 | bitmap->bp[page].map == NULL) | |
61a0d80c | 1330 | csize = ((sector_t)1) << (bitmap->chunkshift + |
ef425673 N |
1331 | PAGE_COUNTER_SHIFT - 1); |
1332 | else | |
61a0d80c | 1333 | csize = ((sector_t)1) << bitmap->chunkshift; |
ef425673 N |
1334 | *blocks = csize - (offset & (csize - 1)); |
1335 | ||
1336 | if (err < 0) | |
32a7627c | 1337 | return NULL; |
ef425673 | 1338 | |
32a7627c N |
1339 | /* now locked ... */ |
1340 | ||
1341 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1342 | /* should we use the first or second counter field | |
1343 | * of the hijacked pointer? */ | |
1344 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
32a7627c N |
1345 | return &((bitmap_counter_t *) |
1346 | &bitmap->bp[page].map)[hi]; | |
ef425673 | 1347 | } else /* page is allocated */ |
32a7627c N |
1348 | return (bitmap_counter_t *) |
1349 | &(bitmap->bp[page].map[pageoff]); | |
32a7627c N |
1350 | } |
1351 | ||
4b6d287f | 1352 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1353 | { |
ac2f40be N |
1354 | if (!bitmap) |
1355 | return 0; | |
4b6d287f N |
1356 | |
1357 | if (behind) { | |
696fcd53 | 1358 | int bw; |
4b6d287f | 1359 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1360 | bw = atomic_read(&bitmap->behind_writes); |
1361 | if (bw > bitmap->behind_writes_used) | |
1362 | bitmap->behind_writes_used = bw; | |
1363 | ||
36a4e1fe N |
1364 | pr_debug("inc write-behind count %d/%lu\n", |
1365 | bw, bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1366 | } |
1367 | ||
32a7627c | 1368 | while (sectors) { |
57dab0bd | 1369 | sector_t blocks; |
32a7627c N |
1370 | bitmap_counter_t *bmc; |
1371 | ||
40cffcc0 N |
1372 | spin_lock_irq(&bitmap->counts.lock); |
1373 | bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 1); | |
32a7627c | 1374 | if (!bmc) { |
40cffcc0 | 1375 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1376 | return 0; |
1377 | } | |
1378 | ||
27d5ea04 | 1379 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
da6e1a32 NB |
1380 | DEFINE_WAIT(__wait); |
1381 | /* note that it is safe to do the prepare_to_wait | |
1382 | * after the test as long as we do it before dropping | |
1383 | * the spinlock. | |
1384 | */ | |
1385 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1386 | TASK_UNINTERRUPTIBLE); | |
40cffcc0 | 1387 | spin_unlock_irq(&bitmap->counts.lock); |
f54a9d0e | 1388 | schedule(); |
da6e1a32 NB |
1389 | finish_wait(&bitmap->overflow_wait, &__wait); |
1390 | continue; | |
1391 | } | |
1392 | ||
ac2f40be | 1393 | switch (*bmc) { |
32a7627c N |
1394 | case 0: |
1395 | bitmap_file_set_bit(bitmap, offset); | |
40cffcc0 | 1396 | bitmap_count_page(&bitmap->counts, offset, 1); |
32a7627c N |
1397 | /* fall through */ |
1398 | case 1: | |
1399 | *bmc = 2; | |
1400 | } | |
da6e1a32 | 1401 | |
32a7627c N |
1402 | (*bmc)++; |
1403 | ||
40cffcc0 | 1404 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1405 | |
1406 | offset += blocks; | |
1407 | if (sectors > blocks) | |
1408 | sectors -= blocks; | |
ac2f40be N |
1409 | else |
1410 | sectors = 0; | |
32a7627c N |
1411 | } |
1412 | return 0; | |
1413 | } | |
ac2f40be | 1414 | EXPORT_SYMBOL(bitmap_startwrite); |
32a7627c N |
1415 | |
1416 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1417 | int success, int behind) |
32a7627c | 1418 | { |
ac2f40be N |
1419 | if (!bitmap) |
1420 | return; | |
4b6d287f | 1421 | if (behind) { |
e555190d N |
1422 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1423 | wake_up(&bitmap->behind_wait); | |
36a4e1fe N |
1424 | pr_debug("dec write-behind count %d/%lu\n", |
1425 | atomic_read(&bitmap->behind_writes), | |
1426 | bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1427 | } |
1428 | ||
32a7627c | 1429 | while (sectors) { |
57dab0bd | 1430 | sector_t blocks; |
32a7627c N |
1431 | unsigned long flags; |
1432 | bitmap_counter_t *bmc; | |
1433 | ||
40cffcc0 N |
1434 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
1435 | bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 0); | |
32a7627c | 1436 | if (!bmc) { |
40cffcc0 | 1437 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1438 | return; |
1439 | } | |
1440 | ||
961902c0 | 1441 | if (success && !bitmap->mddev->degraded && |
a0da84f3 NB |
1442 | bitmap->events_cleared < bitmap->mddev->events) { |
1443 | bitmap->events_cleared = bitmap->mddev->events; | |
1444 | bitmap->need_sync = 1; | |
5ff5afff | 1445 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1446 | } |
1447 | ||
27d5ea04 | 1448 | if (!success && !NEEDED(*bmc)) |
32a7627c N |
1449 | *bmc |= NEEDED_MASK; |
1450 | ||
27d5ea04 | 1451 | if (COUNTER(*bmc) == COUNTER_MAX) |
da6e1a32 NB |
1452 | wake_up(&bitmap->overflow_wait); |
1453 | ||
32a7627c | 1454 | (*bmc)--; |
2585f3ef | 1455 | if (*bmc <= 2) { |
40cffcc0 | 1456 | bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1457 | bitmap->allclean = 0; |
1458 | } | |
40cffcc0 | 1459 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1460 | offset += blocks; |
1461 | if (sectors > blocks) | |
1462 | sectors -= blocks; | |
ac2f40be N |
1463 | else |
1464 | sectors = 0; | |
32a7627c N |
1465 | } |
1466 | } | |
ac2f40be | 1467 | EXPORT_SYMBOL(bitmap_endwrite); |
32a7627c | 1468 | |
57dab0bd | 1469 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a | 1470 | int degraded) |
32a7627c N |
1471 | { |
1472 | bitmap_counter_t *bmc; | |
1473 | int rv; | |
1474 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1475 | *blocks = 1024; | |
1476 | return 1; /* always resync if no bitmap */ | |
1477 | } | |
40cffcc0 N |
1478 | spin_lock_irq(&bitmap->counts.lock); |
1479 | bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); | |
32a7627c N |
1480 | rv = 0; |
1481 | if (bmc) { | |
1482 | /* locked */ | |
1483 | if (RESYNC(*bmc)) | |
1484 | rv = 1; | |
1485 | else if (NEEDED(*bmc)) { | |
1486 | rv = 1; | |
6a806c51 N |
1487 | if (!degraded) { /* don't set/clear bits if degraded */ |
1488 | *bmc |= RESYNC_MASK; | |
1489 | *bmc &= ~NEEDED_MASK; | |
1490 | } | |
32a7627c N |
1491 | } |
1492 | } | |
40cffcc0 | 1493 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1494 | return rv; |
1495 | } | |
1496 | ||
57dab0bd | 1497 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a N |
1498 | int degraded) |
1499 | { | |
1500 | /* bitmap_start_sync must always report on multiples of whole | |
1501 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1502 | * get confused. | |
1503 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1504 | * At least PAGE_SIZE>>9 blocks are covered. | |
1505 | * Return the 'or' of the result. | |
1506 | */ | |
1507 | int rv = 0; | |
57dab0bd | 1508 | sector_t blocks1; |
1187cf0a N |
1509 | |
1510 | *blocks = 0; | |
1511 | while (*blocks < (PAGE_SIZE>>9)) { | |
1512 | rv |= __bitmap_start_sync(bitmap, offset, | |
1513 | &blocks1, degraded); | |
1514 | offset += blocks1; | |
1515 | *blocks += blocks1; | |
1516 | } | |
1517 | return rv; | |
1518 | } | |
ac2f40be | 1519 | EXPORT_SYMBOL(bitmap_start_sync); |
1187cf0a | 1520 | |
57dab0bd | 1521 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
32a7627c N |
1522 | { |
1523 | bitmap_counter_t *bmc; | |
1524 | unsigned long flags; | |
ac2f40be N |
1525 | |
1526 | if (bitmap == NULL) { | |
32a7627c N |
1527 | *blocks = 1024; |
1528 | return; | |
1529 | } | |
40cffcc0 N |
1530 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
1531 | bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); | |
32a7627c N |
1532 | if (bmc == NULL) |
1533 | goto unlock; | |
1534 | /* locked */ | |
32a7627c N |
1535 | if (RESYNC(*bmc)) { |
1536 | *bmc &= ~RESYNC_MASK; | |
1537 | ||
1538 | if (!NEEDED(*bmc) && aborted) | |
1539 | *bmc |= NEEDED_MASK; | |
1540 | else { | |
2585f3ef | 1541 | if (*bmc <= 2) { |
40cffcc0 | 1542 | bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1543 | bitmap->allclean = 0; |
1544 | } | |
32a7627c N |
1545 | } |
1546 | } | |
1547 | unlock: | |
40cffcc0 | 1548 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c | 1549 | } |
ac2f40be | 1550 | EXPORT_SYMBOL(bitmap_end_sync); |
32a7627c N |
1551 | |
1552 | void bitmap_close_sync(struct bitmap *bitmap) | |
1553 | { | |
1554 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1555 | * properly have been aborted. It remains to us to clear the | |
1556 | * RESYNC bit wherever it is still on | |
1557 | */ | |
1558 | sector_t sector = 0; | |
57dab0bd | 1559 | sector_t blocks; |
b47490c9 N |
1560 | if (!bitmap) |
1561 | return; | |
32a7627c N |
1562 | while (sector < bitmap->mddev->resync_max_sectors) { |
1563 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
b47490c9 N |
1564 | sector += blocks; |
1565 | } | |
1566 | } | |
ac2f40be | 1567 | EXPORT_SYMBOL(bitmap_close_sync); |
b47490c9 | 1568 | |
c40f341f | 1569 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force) |
b47490c9 N |
1570 | { |
1571 | sector_t s = 0; | |
57dab0bd | 1572 | sector_t blocks; |
b47490c9 N |
1573 | |
1574 | if (!bitmap) | |
1575 | return; | |
1576 | if (sector == 0) { | |
1577 | bitmap->last_end_sync = jiffies; | |
1578 | return; | |
1579 | } | |
c40f341f | 1580 | if (!force && time_before(jiffies, (bitmap->last_end_sync |
1b04be96 | 1581 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1582 | return; |
1583 | wait_event(bitmap->mddev->recovery_wait, | |
1584 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1585 | ||
75d3da43 | 1586 | bitmap->mddev->curr_resync_completed = sector; |
070dc6dd | 1587 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
40cffcc0 | 1588 | sector &= ~((1ULL << bitmap->counts.chunkshift) - 1); |
b47490c9 N |
1589 | s = 0; |
1590 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
1591 | bitmap_end_sync(bitmap, s, &blocks, 0); | |
1592 | s += blocks; | |
32a7627c | 1593 | } |
b47490c9 | 1594 | bitmap->last_end_sync = jiffies; |
acb180b0 | 1595 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
32a7627c | 1596 | } |
ac2f40be | 1597 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
32a7627c | 1598 | |
6a07997f | 1599 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1600 | { |
1601 | /* For each chunk covered by any of these sectors, set the | |
ef99bf48 | 1602 | * counter to 2 and possibly set resync_needed. They should all |
32a7627c N |
1603 | * be 0 at this point |
1604 | */ | |
193f1c93 | 1605 | |
57dab0bd | 1606 | sector_t secs; |
193f1c93 | 1607 | bitmap_counter_t *bmc; |
40cffcc0 N |
1608 | spin_lock_irq(&bitmap->counts.lock); |
1609 | bmc = bitmap_get_counter(&bitmap->counts, offset, &secs, 1); | |
193f1c93 | 1610 | if (!bmc) { |
40cffcc0 | 1611 | spin_unlock_irq(&bitmap->counts.lock); |
193f1c93 | 1612 | return; |
32a7627c | 1613 | } |
ac2f40be | 1614 | if (!*bmc) { |
11dd35da | 1615 | *bmc = 2; |
40cffcc0 N |
1616 | bitmap_count_page(&bitmap->counts, offset, 1); |
1617 | bitmap_set_pending(&bitmap->counts, offset); | |
2585f3ef | 1618 | bitmap->allclean = 0; |
193f1c93 | 1619 | } |
11dd35da GR |
1620 | if (needed) |
1621 | *bmc |= NEEDED_MASK; | |
40cffcc0 | 1622 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1623 | } |
1624 | ||
9b1d1dac PC |
1625 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1626 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1627 | { | |
1628 | unsigned long chunk; | |
1629 | ||
1630 | for (chunk = s; chunk <= e; chunk++) { | |
40cffcc0 | 1631 | sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift; |
9b1d1dac PC |
1632 | bitmap_set_memory_bits(bitmap, sec, 1); |
1633 | bitmap_file_set_bit(bitmap, sec); | |
ffa23322 N |
1634 | if (sec < bitmap->mddev->recovery_cp) |
1635 | /* We are asserting that the array is dirty, | |
1636 | * so move the recovery_cp address back so | |
1637 | * that it is obvious that it is dirty | |
1638 | */ | |
1639 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1640 | } |
1641 | } | |
1642 | ||
6b8b3e8a N |
1643 | /* |
1644 | * flush out any pending updates | |
1645 | */ | |
fd01b88c | 1646 | void bitmap_flush(struct mddev *mddev) |
6b8b3e8a N |
1647 | { |
1648 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1649 | long sleep; |
6b8b3e8a N |
1650 | |
1651 | if (!bitmap) /* there was no bitmap */ | |
1652 | return; | |
1653 | ||
1654 | /* run the daemon_work three time to ensure everything is flushed | |
1655 | * that can be | |
1656 | */ | |
1b04be96 | 1657 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1658 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1659 | bitmap_daemon_work(mddev); |
42a04b50 | 1660 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1661 | bitmap_daemon_work(mddev); |
42a04b50 | 1662 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1663 | bitmap_daemon_work(mddev); |
6b8b3e8a N |
1664 | bitmap_update_sb(bitmap); |
1665 | } | |
1666 | ||
32a7627c N |
1667 | /* |
1668 | * free memory that was allocated | |
1669 | */ | |
3178b0db | 1670 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1671 | { |
1672 | unsigned long k, pages; | |
1673 | struct bitmap_page *bp; | |
32a7627c N |
1674 | |
1675 | if (!bitmap) /* there was no bitmap */ | |
1676 | return; | |
1677 | ||
f9209a32 GR |
1678 | if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info && |
1679 | bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev)) | |
b97e9257 GR |
1680 | md_cluster_stop(bitmap->mddev); |
1681 | ||
fae7d326 N |
1682 | /* Shouldn't be needed - but just in case.... */ |
1683 | wait_event(bitmap->write_wait, | |
1684 | atomic_read(&bitmap->pending_writes) == 0); | |
1685 | ||
1686 | /* release the bitmap file */ | |
1687 | bitmap_file_unmap(&bitmap->storage); | |
32a7627c | 1688 | |
40cffcc0 N |
1689 | bp = bitmap->counts.bp; |
1690 | pages = bitmap->counts.pages; | |
32a7627c N |
1691 | |
1692 | /* free all allocated memory */ | |
1693 | ||
32a7627c N |
1694 | if (bp) /* deallocate the page memory */ |
1695 | for (k = 0; k < pages; k++) | |
1696 | if (bp[k].map && !bp[k].hijacked) | |
1697 | kfree(bp[k].map); | |
1698 | kfree(bp); | |
1699 | kfree(bitmap); | |
1700 | } | |
aa5cbd10 | 1701 | |
fd01b88c | 1702 | void bitmap_destroy(struct mddev *mddev) |
3178b0db N |
1703 | { |
1704 | struct bitmap *bitmap = mddev->bitmap; | |
1705 | ||
1706 | if (!bitmap) /* there was no bitmap */ | |
1707 | return; | |
1708 | ||
c3d9714e | 1709 | mutex_lock(&mddev->bitmap_info.mutex); |
978a7a47 | 1710 | spin_lock(&mddev->lock); |
3178b0db | 1711 | mddev->bitmap = NULL; /* disconnect from the md device */ |
978a7a47 | 1712 | spin_unlock(&mddev->lock); |
c3d9714e | 1713 | mutex_unlock(&mddev->bitmap_info.mutex); |
b15c2e57 N |
1714 | if (mddev->thread) |
1715 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db | 1716 | |
ece5cff0 N |
1717 | if (bitmap->sysfs_can_clear) |
1718 | sysfs_put(bitmap->sysfs_can_clear); | |
1719 | ||
3178b0db N |
1720 | bitmap_free(bitmap); |
1721 | } | |
32a7627c N |
1722 | |
1723 | /* | |
1724 | * initialize the bitmap structure | |
1725 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1726 | */ | |
f9209a32 | 1727 | struct bitmap *bitmap_create(struct mddev *mddev, int slot) |
32a7627c N |
1728 | { |
1729 | struct bitmap *bitmap; | |
1f593903 | 1730 | sector_t blocks = mddev->resync_max_sectors; |
c3d9714e | 1731 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1732 | int err; |
324a56e1 | 1733 | struct kernfs_node *bm = NULL; |
32a7627c | 1734 | |
5f6e3c83 | 1735 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1736 | |
c3d9714e | 1737 | BUG_ON(file && mddev->bitmap_info.offset); |
a654b9d8 | 1738 | |
9ffae0cf | 1739 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c | 1740 | if (!bitmap) |
f9209a32 | 1741 | return ERR_PTR(-ENOMEM); |
32a7627c | 1742 | |
40cffcc0 | 1743 | spin_lock_init(&bitmap->counts.lock); |
ce25c31b N |
1744 | atomic_set(&bitmap->pending_writes, 0); |
1745 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1746 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1747 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1748 | |
32a7627c | 1749 | bitmap->mddev = mddev; |
f9209a32 | 1750 | bitmap->cluster_slot = slot; |
32a7627c | 1751 | |
5ff5afff | 1752 | if (mddev->kobj.sd) |
388975cc | 1753 | bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap"); |
ece5cff0 | 1754 | if (bm) { |
388975cc | 1755 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear"); |
ece5cff0 N |
1756 | sysfs_put(bm); |
1757 | } else | |
1758 | bitmap->sysfs_can_clear = NULL; | |
1759 | ||
1ec885cd | 1760 | bitmap->storage.file = file; |
ce25c31b N |
1761 | if (file) { |
1762 | get_file(file); | |
ae8fa283 N |
1763 | /* As future accesses to this file will use bmap, |
1764 | * and bypass the page cache, we must sync the file | |
1765 | * first. | |
1766 | */ | |
8018ab05 | 1767 | vfs_fsync(file, 1); |
ce25c31b | 1768 | } |
42a04b50 | 1769 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
9c81075f JB |
1770 | if (!mddev->bitmap_info.external) { |
1771 | /* | |
1772 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is | |
1773 | * instructing us to create a new on-disk bitmap instance. | |
1774 | */ | |
1775 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) | |
1776 | err = bitmap_new_disk_sb(bitmap); | |
1777 | else | |
1778 | err = bitmap_read_sb(bitmap); | |
1779 | } else { | |
ece5cff0 N |
1780 | err = 0; |
1781 | if (mddev->bitmap_info.chunksize == 0 || | |
1782 | mddev->bitmap_info.daemon_sleep == 0) | |
1783 | /* chunksize and time_base need to be | |
1784 | * set first. */ | |
1785 | err = -EINVAL; | |
1786 | } | |
32a7627c | 1787 | if (err) |
3178b0db | 1788 | goto error; |
32a7627c | 1789 | |
624ce4f5 | 1790 | bitmap->daemon_lastrun = jiffies; |
d60b479d N |
1791 | err = bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1); |
1792 | if (err) | |
3178b0db | 1793 | goto error; |
32a7627c | 1794 | |
69e51b44 | 1795 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
d60b479d | 1796 | bitmap->counts.pages, bmname(bitmap)); |
69e51b44 | 1797 | |
f9209a32 GR |
1798 | err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0; |
1799 | if (err) | |
1800 | goto error; | |
69e51b44 | 1801 | |
f9209a32 | 1802 | return bitmap; |
69e51b44 N |
1803 | error: |
1804 | bitmap_free(bitmap); | |
f9209a32 | 1805 | return ERR_PTR(err); |
69e51b44 N |
1806 | } |
1807 | ||
fd01b88c | 1808 | int bitmap_load(struct mddev *mddev) |
69e51b44 N |
1809 | { |
1810 | int err = 0; | |
3520fa4d | 1811 | sector_t start = 0; |
69e51b44 N |
1812 | sector_t sector = 0; |
1813 | struct bitmap *bitmap = mddev->bitmap; | |
1814 | ||
1815 | if (!bitmap) | |
1816 | goto out; | |
1817 | ||
1818 | /* Clear out old bitmap info first: Either there is none, or we | |
1819 | * are resuming after someone else has possibly changed things, | |
1820 | * so we should forget old cached info. | |
1821 | * All chunks should be clean, but some might need_sync. | |
1822 | */ | |
1823 | while (sector < mddev->resync_max_sectors) { | |
57dab0bd | 1824 | sector_t blocks; |
69e51b44 N |
1825 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
1826 | sector += blocks; | |
1827 | } | |
1828 | bitmap_close_sync(bitmap); | |
1829 | ||
3520fa4d JB |
1830 | if (mddev->degraded == 0 |
1831 | || bitmap->events_cleared == mddev->events) | |
1832 | /* no need to keep dirty bits to optimise a | |
1833 | * re-add of a missing device */ | |
1834 | start = mddev->recovery_cp; | |
1835 | ||
afbaa90b | 1836 | mutex_lock(&mddev->bitmap_info.mutex); |
3520fa4d | 1837 | err = bitmap_init_from_disk(bitmap, start); |
afbaa90b | 1838 | mutex_unlock(&mddev->bitmap_info.mutex); |
3520fa4d | 1839 | |
32a7627c | 1840 | if (err) |
69e51b44 | 1841 | goto out; |
b405fe91 | 1842 | clear_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
1843 | |
1844 | /* Kick recovery in case any bits were set */ | |
1845 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
3178b0db | 1846 | |
1b04be96 | 1847 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
9cd30fdc | 1848 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 1849 | |
4ad13663 N |
1850 | bitmap_update_sb(bitmap); |
1851 | ||
b405fe91 | 1852 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
69e51b44 N |
1853 | err = -EIO; |
1854 | out: | |
3178b0db | 1855 | return err; |
32a7627c | 1856 | } |
69e51b44 | 1857 | EXPORT_SYMBOL_GPL(bitmap_load); |
32a7627c | 1858 | |
11dd35da GR |
1859 | /* Loads the bitmap associated with slot and copies the resync information |
1860 | * to our bitmap | |
1861 | */ | |
1862 | int bitmap_copy_from_slot(struct mddev *mddev, int slot, | |
97f6cd39 | 1863 | sector_t *low, sector_t *high, bool clear_bits) |
11dd35da GR |
1864 | { |
1865 | int rv = 0, i, j; | |
1866 | sector_t block, lo = 0, hi = 0; | |
1867 | struct bitmap_counts *counts; | |
1868 | struct bitmap *bitmap = bitmap_create(mddev, slot); | |
1869 | ||
1870 | if (IS_ERR(bitmap)) | |
1871 | return PTR_ERR(bitmap); | |
1872 | ||
11dd35da GR |
1873 | rv = bitmap_init_from_disk(bitmap, 0); |
1874 | if (rv) | |
1875 | goto err; | |
1876 | ||
1877 | counts = &bitmap->counts; | |
1878 | for (j = 0; j < counts->chunks; j++) { | |
1879 | block = (sector_t)j << counts->chunkshift; | |
1880 | if (bitmap_file_test_bit(bitmap, block)) { | |
1881 | if (!lo) | |
1882 | lo = block; | |
1883 | hi = block; | |
1884 | bitmap_file_clear_bit(bitmap, block); | |
1885 | bitmap_set_memory_bits(mddev->bitmap, block, 1); | |
1886 | bitmap_file_set_bit(mddev->bitmap, block); | |
1887 | } | |
1888 | } | |
1889 | ||
97f6cd39 GR |
1890 | if (clear_bits) { |
1891 | bitmap_update_sb(bitmap); | |
1892 | /* Setting this for the ev_page should be enough. | |
1893 | * And we do not require both write_all and PAGE_DIRT either | |
1894 | */ | |
1895 | for (i = 0; i < bitmap->storage.file_pages; i++) | |
1896 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); | |
1897 | bitmap_write_all(bitmap); | |
1898 | bitmap_unplug(bitmap); | |
1899 | } | |
11dd35da GR |
1900 | *low = lo; |
1901 | *high = hi; | |
1902 | err: | |
1903 | bitmap_free(bitmap); | |
1904 | return rv; | |
1905 | } | |
1906 | EXPORT_SYMBOL_GPL(bitmap_copy_from_slot); | |
1907 | ||
1908 | ||
57148964 N |
1909 | void bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
1910 | { | |
1911 | unsigned long chunk_kb; | |
40cffcc0 | 1912 | struct bitmap_counts *counts; |
57148964 N |
1913 | |
1914 | if (!bitmap) | |
1915 | return; | |
1916 | ||
40cffcc0 N |
1917 | counts = &bitmap->counts; |
1918 | ||
57148964 N |
1919 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; |
1920 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
1921 | "%lu%s chunk", | |
40cffcc0 N |
1922 | counts->pages - counts->missing_pages, |
1923 | counts->pages, | |
1924 | (counts->pages - counts->missing_pages) | |
57148964 N |
1925 | << (PAGE_SHIFT - 10), |
1926 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, | |
1927 | chunk_kb ? "KB" : "B"); | |
1ec885cd | 1928 | if (bitmap->storage.file) { |
57148964 | 1929 | seq_printf(seq, ", file: "); |
2726d566 | 1930 | seq_file_path(seq, bitmap->storage.file, " \t\n"); |
57148964 N |
1931 | } |
1932 | ||
1933 | seq_printf(seq, "\n"); | |
57148964 N |
1934 | } |
1935 | ||
d60b479d N |
1936 | int bitmap_resize(struct bitmap *bitmap, sector_t blocks, |
1937 | int chunksize, int init) | |
1938 | { | |
1939 | /* If chunk_size is 0, choose an appropriate chunk size. | |
1940 | * Then possibly allocate new storage space. | |
1941 | * Then quiesce, copy bits, replace bitmap, and re-start | |
1942 | * | |
1943 | * This function is called both to set up the initial bitmap | |
1944 | * and to resize the bitmap while the array is active. | |
1945 | * If this happens as a result of the array being resized, | |
1946 | * chunksize will be zero, and we need to choose a suitable | |
1947 | * chunksize, otherwise we use what we are given. | |
1948 | */ | |
1949 | struct bitmap_storage store; | |
1950 | struct bitmap_counts old_counts; | |
1951 | unsigned long chunks; | |
1952 | sector_t block; | |
1953 | sector_t old_blocks, new_blocks; | |
1954 | int chunkshift; | |
1955 | int ret = 0; | |
1956 | long pages; | |
1957 | struct bitmap_page *new_bp; | |
1958 | ||
1959 | if (chunksize == 0) { | |
1960 | /* If there is enough space, leave the chunk size unchanged, | |
1961 | * else increase by factor of two until there is enough space. | |
1962 | */ | |
1963 | long bytes; | |
1964 | long space = bitmap->mddev->bitmap_info.space; | |
1965 | ||
1966 | if (space == 0) { | |
1967 | /* We don't know how much space there is, so limit | |
1968 | * to current size - in sectors. | |
1969 | */ | |
1970 | bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8); | |
1971 | if (!bitmap->mddev->bitmap_info.external) | |
1972 | bytes += sizeof(bitmap_super_t); | |
1973 | space = DIV_ROUND_UP(bytes, 512); | |
1974 | bitmap->mddev->bitmap_info.space = space; | |
1975 | } | |
1976 | chunkshift = bitmap->counts.chunkshift; | |
1977 | chunkshift--; | |
1978 | do { | |
1979 | /* 'chunkshift' is shift from block size to chunk size */ | |
1980 | chunkshift++; | |
1981 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
1982 | bytes = DIV_ROUND_UP(chunks, 8); | |
1983 | if (!bitmap->mddev->bitmap_info.external) | |
1984 | bytes += sizeof(bitmap_super_t); | |
1985 | } while (bytes > (space << 9)); | |
1986 | } else | |
1987 | chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT; | |
1988 | ||
1989 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
1990 | memset(&store, 0, sizeof(store)); | |
1991 | if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file) | |
1992 | ret = bitmap_storage_alloc(&store, chunks, | |
b97e9257 | 1993 | !bitmap->mddev->bitmap_info.external, |
da6fb7a9 N |
1994 | mddev_is_clustered(bitmap->mddev) |
1995 | ? bitmap->cluster_slot : 0); | |
d60b479d N |
1996 | if (ret) |
1997 | goto err; | |
1998 | ||
1999 | pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO); | |
2000 | ||
2001 | new_bp = kzalloc(pages * sizeof(*new_bp), GFP_KERNEL); | |
2002 | ret = -ENOMEM; | |
2003 | if (!new_bp) { | |
2004 | bitmap_file_unmap(&store); | |
2005 | goto err; | |
2006 | } | |
2007 | ||
2008 | if (!init) | |
2009 | bitmap->mddev->pers->quiesce(bitmap->mddev, 1); | |
2010 | ||
2011 | store.file = bitmap->storage.file; | |
2012 | bitmap->storage.file = NULL; | |
2013 | ||
2014 | if (store.sb_page && bitmap->storage.sb_page) | |
2015 | memcpy(page_address(store.sb_page), | |
2016 | page_address(bitmap->storage.sb_page), | |
2017 | sizeof(bitmap_super_t)); | |
2018 | bitmap_file_unmap(&bitmap->storage); | |
2019 | bitmap->storage = store; | |
2020 | ||
2021 | old_counts = bitmap->counts; | |
2022 | bitmap->counts.bp = new_bp; | |
2023 | bitmap->counts.pages = pages; | |
2024 | bitmap->counts.missing_pages = pages; | |
2025 | bitmap->counts.chunkshift = chunkshift; | |
2026 | bitmap->counts.chunks = chunks; | |
2027 | bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift + | |
2028 | BITMAP_BLOCK_SHIFT); | |
2029 | ||
2030 | blocks = min(old_counts.chunks << old_counts.chunkshift, | |
2031 | chunks << chunkshift); | |
2032 | ||
2033 | spin_lock_irq(&bitmap->counts.lock); | |
2034 | for (block = 0; block < blocks; ) { | |
2035 | bitmap_counter_t *bmc_old, *bmc_new; | |
2036 | int set; | |
2037 | ||
2038 | bmc_old = bitmap_get_counter(&old_counts, block, | |
2039 | &old_blocks, 0); | |
2040 | set = bmc_old && NEEDED(*bmc_old); | |
2041 | ||
2042 | if (set) { | |
2043 | bmc_new = bitmap_get_counter(&bitmap->counts, block, | |
2044 | &new_blocks, 1); | |
2045 | if (*bmc_new == 0) { | |
2046 | /* need to set on-disk bits too. */ | |
2047 | sector_t end = block + new_blocks; | |
2048 | sector_t start = block >> chunkshift; | |
2049 | start <<= chunkshift; | |
2050 | while (start < end) { | |
2051 | bitmap_file_set_bit(bitmap, block); | |
2052 | start += 1 << chunkshift; | |
2053 | } | |
2054 | *bmc_new = 2; | |
2055 | bitmap_count_page(&bitmap->counts, | |
2056 | block, 1); | |
2057 | bitmap_set_pending(&bitmap->counts, | |
2058 | block); | |
2059 | } | |
2060 | *bmc_new |= NEEDED_MASK; | |
2061 | if (new_blocks < old_blocks) | |
2062 | old_blocks = new_blocks; | |
2063 | } | |
2064 | block += old_blocks; | |
2065 | } | |
2066 | ||
2067 | if (!init) { | |
2068 | int i; | |
2069 | while (block < (chunks << chunkshift)) { | |
2070 | bitmap_counter_t *bmc; | |
2071 | bmc = bitmap_get_counter(&bitmap->counts, block, | |
2072 | &new_blocks, 1); | |
2073 | if (bmc) { | |
2074 | /* new space. It needs to be resynced, so | |
2075 | * we set NEEDED_MASK. | |
2076 | */ | |
2077 | if (*bmc == 0) { | |
2078 | *bmc = NEEDED_MASK | 2; | |
2079 | bitmap_count_page(&bitmap->counts, | |
2080 | block, 1); | |
2081 | bitmap_set_pending(&bitmap->counts, | |
2082 | block); | |
2083 | } | |
2084 | } | |
2085 | block += new_blocks; | |
2086 | } | |
2087 | for (i = 0; i < bitmap->storage.file_pages; i++) | |
2088 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); | |
2089 | } | |
2090 | spin_unlock_irq(&bitmap->counts.lock); | |
2091 | ||
2092 | if (!init) { | |
2093 | bitmap_unplug(bitmap); | |
2094 | bitmap->mddev->pers->quiesce(bitmap->mddev, 0); | |
2095 | } | |
2096 | ret = 0; | |
2097 | err: | |
2098 | return ret; | |
2099 | } | |
2100 | EXPORT_SYMBOL_GPL(bitmap_resize); | |
2101 | ||
43a70507 | 2102 | static ssize_t |
fd01b88c | 2103 | location_show(struct mddev *mddev, char *page) |
43a70507 N |
2104 | { |
2105 | ssize_t len; | |
ac2f40be | 2106 | if (mddev->bitmap_info.file) |
43a70507 | 2107 | len = sprintf(page, "file"); |
ac2f40be | 2108 | else if (mddev->bitmap_info.offset) |
43a70507 | 2109 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 2110 | else |
43a70507 N |
2111 | len = sprintf(page, "none"); |
2112 | len += sprintf(page+len, "\n"); | |
2113 | return len; | |
2114 | } | |
2115 | ||
2116 | static ssize_t | |
fd01b88c | 2117 | location_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2118 | { |
2119 | ||
2120 | if (mddev->pers) { | |
2121 | if (!mddev->pers->quiesce) | |
2122 | return -EBUSY; | |
2123 | if (mddev->recovery || mddev->sync_thread) | |
2124 | return -EBUSY; | |
2125 | } | |
2126 | ||
2127 | if (mddev->bitmap || mddev->bitmap_info.file || | |
2128 | mddev->bitmap_info.offset) { | |
2129 | /* bitmap already configured. Only option is to clear it */ | |
2130 | if (strncmp(buf, "none", 4) != 0) | |
2131 | return -EBUSY; | |
2132 | if (mddev->pers) { | |
2133 | mddev->pers->quiesce(mddev, 1); | |
2134 | bitmap_destroy(mddev); | |
2135 | mddev->pers->quiesce(mddev, 0); | |
2136 | } | |
2137 | mddev->bitmap_info.offset = 0; | |
2138 | if (mddev->bitmap_info.file) { | |
2139 | struct file *f = mddev->bitmap_info.file; | |
2140 | mddev->bitmap_info.file = NULL; | |
43a70507 N |
2141 | fput(f); |
2142 | } | |
2143 | } else { | |
2144 | /* No bitmap, OK to set a location */ | |
2145 | long long offset; | |
2146 | if (strncmp(buf, "none", 4) == 0) | |
2147 | /* nothing to be done */; | |
2148 | else if (strncmp(buf, "file:", 5) == 0) { | |
2149 | /* Not supported yet */ | |
2150 | return -EINVAL; | |
2151 | } else { | |
2152 | int rv; | |
2153 | if (buf[0] == '+') | |
b29bebd6 | 2154 | rv = kstrtoll(buf+1, 10, &offset); |
43a70507 | 2155 | else |
b29bebd6 | 2156 | rv = kstrtoll(buf, 10, &offset); |
43a70507 N |
2157 | if (rv) |
2158 | return rv; | |
2159 | if (offset == 0) | |
2160 | return -EINVAL; | |
ece5cff0 N |
2161 | if (mddev->bitmap_info.external == 0 && |
2162 | mddev->major_version == 0 && | |
43a70507 N |
2163 | offset != mddev->bitmap_info.default_offset) |
2164 | return -EINVAL; | |
2165 | mddev->bitmap_info.offset = offset; | |
2166 | if (mddev->pers) { | |
f9209a32 | 2167 | struct bitmap *bitmap; |
43a70507 | 2168 | mddev->pers->quiesce(mddev, 1); |
f9209a32 GR |
2169 | bitmap = bitmap_create(mddev, -1); |
2170 | if (IS_ERR(bitmap)) | |
2171 | rv = PTR_ERR(bitmap); | |
2172 | else { | |
2173 | mddev->bitmap = bitmap; | |
4474ca42 | 2174 | rv = bitmap_load(mddev); |
f9209a32 GR |
2175 | if (rv) { |
2176 | bitmap_destroy(mddev); | |
2177 | mddev->bitmap_info.offset = 0; | |
2178 | } | |
43a70507 N |
2179 | } |
2180 | mddev->pers->quiesce(mddev, 0); | |
2181 | if (rv) | |
2182 | return rv; | |
2183 | } | |
2184 | } | |
2185 | } | |
2186 | if (!mddev->external) { | |
2187 | /* Ensure new bitmap info is stored in | |
2188 | * metadata promptly. | |
2189 | */ | |
2190 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2191 | md_wakeup_thread(mddev->thread); | |
2192 | } | |
2193 | return len; | |
2194 | } | |
2195 | ||
2196 | static struct md_sysfs_entry bitmap_location = | |
2197 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
2198 | ||
6409bb05 N |
2199 | /* 'bitmap/space' is the space available at 'location' for the |
2200 | * bitmap. This allows the kernel to know when it is safe to | |
2201 | * resize the bitmap to match a resized array. | |
2202 | */ | |
2203 | static ssize_t | |
2204 | space_show(struct mddev *mddev, char *page) | |
2205 | { | |
2206 | return sprintf(page, "%lu\n", mddev->bitmap_info.space); | |
2207 | } | |
2208 | ||
2209 | static ssize_t | |
2210 | space_store(struct mddev *mddev, const char *buf, size_t len) | |
2211 | { | |
2212 | unsigned long sectors; | |
2213 | int rv; | |
2214 | ||
2215 | rv = kstrtoul(buf, 10, §ors); | |
2216 | if (rv) | |
2217 | return rv; | |
2218 | ||
2219 | if (sectors == 0) | |
2220 | return -EINVAL; | |
2221 | ||
2222 | if (mddev->bitmap && | |
9b1215c1 | 2223 | sectors < (mddev->bitmap->storage.bytes + 511) >> 9) |
6409bb05 N |
2224 | return -EFBIG; /* Bitmap is too big for this small space */ |
2225 | ||
2226 | /* could make sure it isn't too big, but that isn't really | |
2227 | * needed - user-space should be careful. | |
2228 | */ | |
2229 | mddev->bitmap_info.space = sectors; | |
2230 | return len; | |
2231 | } | |
2232 | ||
2233 | static struct md_sysfs_entry bitmap_space = | |
2234 | __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); | |
2235 | ||
43a70507 | 2236 | static ssize_t |
fd01b88c | 2237 | timeout_show(struct mddev *mddev, char *page) |
43a70507 N |
2238 | { |
2239 | ssize_t len; | |
2240 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
2241 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 2242 | |
43a70507 N |
2243 | len = sprintf(page, "%lu", secs); |
2244 | if (jifs) | |
2245 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
2246 | len += sprintf(page+len, "\n"); | |
2247 | return len; | |
2248 | } | |
2249 | ||
2250 | static ssize_t | |
fd01b88c | 2251 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2252 | { |
2253 | /* timeout can be set at any time */ | |
2254 | unsigned long timeout; | |
2255 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
2256 | if (rv) | |
2257 | return rv; | |
2258 | ||
2259 | /* just to make sure we don't overflow... */ | |
2260 | if (timeout >= LONG_MAX / HZ) | |
2261 | return -EINVAL; | |
2262 | ||
2263 | timeout = timeout * HZ / 10000; | |
2264 | ||
2265 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
2266 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
2267 | if (timeout < 1) | |
2268 | timeout = 1; | |
2269 | mddev->bitmap_info.daemon_sleep = timeout; | |
2270 | if (mddev->thread) { | |
2271 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then | |
2272 | * the bitmap is all clean and we don't need to | |
2273 | * adjust the timeout right now | |
2274 | */ | |
2275 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { | |
2276 | mddev->thread->timeout = timeout; | |
2277 | md_wakeup_thread(mddev->thread); | |
2278 | } | |
2279 | } | |
2280 | return len; | |
2281 | } | |
2282 | ||
2283 | static struct md_sysfs_entry bitmap_timeout = | |
2284 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
2285 | ||
2286 | static ssize_t | |
fd01b88c | 2287 | backlog_show(struct mddev *mddev, char *page) |
43a70507 N |
2288 | { |
2289 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
2290 | } | |
2291 | ||
2292 | static ssize_t | |
fd01b88c | 2293 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2294 | { |
2295 | unsigned long backlog; | |
b29bebd6 | 2296 | int rv = kstrtoul(buf, 10, &backlog); |
43a70507 N |
2297 | if (rv) |
2298 | return rv; | |
2299 | if (backlog > COUNTER_MAX) | |
2300 | return -EINVAL; | |
2301 | mddev->bitmap_info.max_write_behind = backlog; | |
2302 | return len; | |
2303 | } | |
2304 | ||
2305 | static struct md_sysfs_entry bitmap_backlog = | |
2306 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
2307 | ||
2308 | static ssize_t | |
fd01b88c | 2309 | chunksize_show(struct mddev *mddev, char *page) |
43a70507 N |
2310 | { |
2311 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
2312 | } | |
2313 | ||
2314 | static ssize_t | |
fd01b88c | 2315 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2316 | { |
2317 | /* Can only be changed when no bitmap is active */ | |
2318 | int rv; | |
2319 | unsigned long csize; | |
2320 | if (mddev->bitmap) | |
2321 | return -EBUSY; | |
b29bebd6 | 2322 | rv = kstrtoul(buf, 10, &csize); |
43a70507 N |
2323 | if (rv) |
2324 | return rv; | |
2325 | if (csize < 512 || | |
2326 | !is_power_of_2(csize)) | |
2327 | return -EINVAL; | |
2328 | mddev->bitmap_info.chunksize = csize; | |
2329 | return len; | |
2330 | } | |
2331 | ||
2332 | static struct md_sysfs_entry bitmap_chunksize = | |
2333 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
2334 | ||
fd01b88c | 2335 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
ece5cff0 | 2336 | { |
c4ce867f GR |
2337 | if (mddev_is_clustered(mddev)) |
2338 | return sprintf(page, "clustered\n"); | |
ece5cff0 N |
2339 | return sprintf(page, "%s\n", (mddev->bitmap_info.external |
2340 | ? "external" : "internal")); | |
2341 | } | |
2342 | ||
fd01b88c | 2343 | static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2344 | { |
2345 | if (mddev->bitmap || | |
2346 | mddev->bitmap_info.file || | |
2347 | mddev->bitmap_info.offset) | |
2348 | return -EBUSY; | |
2349 | if (strncmp(buf, "external", 8) == 0) | |
2350 | mddev->bitmap_info.external = 1; | |
c4ce867f GR |
2351 | else if ((strncmp(buf, "internal", 8) == 0) || |
2352 | (strncmp(buf, "clustered", 9) == 0)) | |
ece5cff0 N |
2353 | mddev->bitmap_info.external = 0; |
2354 | else | |
2355 | return -EINVAL; | |
2356 | return len; | |
2357 | } | |
2358 | ||
2359 | static struct md_sysfs_entry bitmap_metadata = | |
2360 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
2361 | ||
fd01b88c | 2362 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
ece5cff0 N |
2363 | { |
2364 | int len; | |
b7b17c9b | 2365 | spin_lock(&mddev->lock); |
ece5cff0 N |
2366 | if (mddev->bitmap) |
2367 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
2368 | "false" : "true")); | |
2369 | else | |
2370 | len = sprintf(page, "\n"); | |
b7b17c9b | 2371 | spin_unlock(&mddev->lock); |
ece5cff0 N |
2372 | return len; |
2373 | } | |
2374 | ||
fd01b88c | 2375 | static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2376 | { |
2377 | if (mddev->bitmap == NULL) | |
2378 | return -ENOENT; | |
2379 | if (strncmp(buf, "false", 5) == 0) | |
2380 | mddev->bitmap->need_sync = 1; | |
2381 | else if (strncmp(buf, "true", 4) == 0) { | |
2382 | if (mddev->degraded) | |
2383 | return -EBUSY; | |
2384 | mddev->bitmap->need_sync = 0; | |
2385 | } else | |
2386 | return -EINVAL; | |
2387 | return len; | |
2388 | } | |
2389 | ||
2390 | static struct md_sysfs_entry bitmap_can_clear = | |
2391 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
2392 | ||
696fcd53 | 2393 | static ssize_t |
fd01b88c | 2394 | behind_writes_used_show(struct mddev *mddev, char *page) |
696fcd53 | 2395 | { |
b7b17c9b N |
2396 | ssize_t ret; |
2397 | spin_lock(&mddev->lock); | |
696fcd53 | 2398 | if (mddev->bitmap == NULL) |
b7b17c9b N |
2399 | ret = sprintf(page, "0\n"); |
2400 | else | |
2401 | ret = sprintf(page, "%lu\n", | |
2402 | mddev->bitmap->behind_writes_used); | |
2403 | spin_unlock(&mddev->lock); | |
2404 | return ret; | |
696fcd53 PC |
2405 | } |
2406 | ||
2407 | static ssize_t | |
fd01b88c | 2408 | behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) |
696fcd53 PC |
2409 | { |
2410 | if (mddev->bitmap) | |
2411 | mddev->bitmap->behind_writes_used = 0; | |
2412 | return len; | |
2413 | } | |
2414 | ||
2415 | static struct md_sysfs_entry max_backlog_used = | |
2416 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2417 | behind_writes_used_show, behind_writes_used_reset); | |
2418 | ||
43a70507 N |
2419 | static struct attribute *md_bitmap_attrs[] = { |
2420 | &bitmap_location.attr, | |
6409bb05 | 2421 | &bitmap_space.attr, |
43a70507 N |
2422 | &bitmap_timeout.attr, |
2423 | &bitmap_backlog.attr, | |
2424 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2425 | &bitmap_metadata.attr, |
2426 | &bitmap_can_clear.attr, | |
696fcd53 | 2427 | &max_backlog_used.attr, |
43a70507 N |
2428 | NULL |
2429 | }; | |
2430 | struct attribute_group md_bitmap_group = { | |
2431 | .name = "bitmap", | |
2432 | .attrs = md_bitmap_attrs, | |
2433 | }; | |
2434 |