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; |
b97e9257 GR |
213 | int node_offset = 0; |
214 | ||
215 | if (mddev_is_clustered(bitmap->mddev)) | |
216 | node_offset = bitmap->cluster_slot * store->file_pages; | |
a654b9d8 | 217 | |
b2d2c4ce | 218 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
ac2f40be N |
219 | int size = PAGE_SIZE; |
220 | loff_t offset = mddev->bitmap_info.offset; | |
a6ff7e08 JB |
221 | |
222 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; | |
223 | ||
9b1215c1 N |
224 | if (page->index == store->file_pages-1) { |
225 | int last_page_size = store->bytes & (PAGE_SIZE-1); | |
226 | if (last_page_size == 0) | |
227 | last_page_size = PAGE_SIZE; | |
228 | size = roundup(last_page_size, | |
a6ff7e08 | 229 | bdev_logical_block_size(bdev)); |
9b1215c1 | 230 | } |
ac2f40be N |
231 | /* Just make sure we aren't corrupting data or |
232 | * metadata | |
233 | */ | |
234 | if (mddev->external) { | |
235 | /* Bitmap could be anywhere. */ | |
236 | if (rdev->sb_start + offset + (page->index | |
237 | * (PAGE_SIZE/512)) | |
238 | > rdev->data_offset | |
239 | && | |
240 | rdev->sb_start + offset | |
241 | < (rdev->data_offset + mddev->dev_sectors | |
242 | + (PAGE_SIZE/512))) | |
243 | goto bad_alignment; | |
244 | } else if (offset < 0) { | |
245 | /* DATA BITMAP METADATA */ | |
246 | if (offset | |
247 | + (long)(page->index * (PAGE_SIZE/512)) | |
248 | + size/512 > 0) | |
249 | /* bitmap runs in to metadata */ | |
250 | goto bad_alignment; | |
251 | if (rdev->data_offset + mddev->dev_sectors | |
252 | > rdev->sb_start + offset) | |
253 | /* data runs in to bitmap */ | |
254 | goto bad_alignment; | |
255 | } else if (rdev->sb_start < rdev->data_offset) { | |
256 | /* METADATA BITMAP DATA */ | |
257 | if (rdev->sb_start | |
258 | + offset | |
259 | + page->index*(PAGE_SIZE/512) + size/512 | |
260 | > rdev->data_offset) | |
261 | /* bitmap runs in to data */ | |
262 | goto bad_alignment; | |
263 | } else { | |
264 | /* DATA METADATA BITMAP - no problems */ | |
265 | } | |
266 | md_super_write(mddev, rdev, | |
267 | rdev->sb_start + offset | |
268 | + page->index * (PAGE_SIZE/512), | |
269 | size, | |
270 | page); | |
b2d2c4ce | 271 | } |
a654b9d8 N |
272 | |
273 | if (wait) | |
a9701a30 | 274 | md_super_wait(mddev); |
a654b9d8 | 275 | return 0; |
4b80991c N |
276 | |
277 | bad_alignment: | |
4b80991c | 278 | return -EINVAL; |
a654b9d8 N |
279 | } |
280 | ||
4ad13663 | 281 | static void bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 282 | /* |
a654b9d8 | 283 | * write out a page to a file |
32a7627c | 284 | */ |
4ad13663 | 285 | static void write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 286 | { |
d785a06a | 287 | struct buffer_head *bh; |
32a7627c | 288 | |
1ec885cd | 289 | if (bitmap->storage.file == NULL) { |
f0d76d70 N |
290 | switch (write_sb_page(bitmap, page, wait)) { |
291 | case -EINVAL: | |
b405fe91 | 292 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); |
f0d76d70 | 293 | } |
4ad13663 | 294 | } else { |
a654b9d8 | 295 | |
4ad13663 | 296 | bh = page_buffers(page); |
c708443c | 297 | |
4ad13663 N |
298 | while (bh && bh->b_blocknr) { |
299 | atomic_inc(&bitmap->pending_writes); | |
300 | set_buffer_locked(bh); | |
301 | set_buffer_mapped(bh); | |
721a9602 | 302 | submit_bh(WRITE | REQ_SYNC, bh); |
4ad13663 N |
303 | bh = bh->b_this_page; |
304 | } | |
d785a06a | 305 | |
ac2f40be | 306 | if (wait) |
4ad13663 N |
307 | wait_event(bitmap->write_wait, |
308 | atomic_read(&bitmap->pending_writes)==0); | |
8a5e9cf1 | 309 | } |
b405fe91 | 310 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
4ad13663 | 311 | bitmap_file_kick(bitmap); |
d785a06a N |
312 | } |
313 | ||
314 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
315 | { | |
316 | struct bitmap *bitmap = bh->b_private; | |
32a7627c | 317 | |
b405fe91 N |
318 | if (!uptodate) |
319 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); | |
d785a06a N |
320 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
321 | wake_up(&bitmap->write_wait); | |
322 | } | |
32a7627c | 323 | |
d785a06a N |
324 | /* copied from buffer.c */ |
325 | static void | |
326 | __clear_page_buffers(struct page *page) | |
327 | { | |
328 | ClearPagePrivate(page); | |
329 | set_page_private(page, 0); | |
330 | page_cache_release(page); | |
331 | } | |
332 | static void free_buffers(struct page *page) | |
333 | { | |
27581e5a | 334 | struct buffer_head *bh; |
77ad4bc7 | 335 | |
27581e5a N |
336 | if (!PagePrivate(page)) |
337 | return; | |
338 | ||
339 | bh = page_buffers(page); | |
d785a06a N |
340 | while (bh) { |
341 | struct buffer_head *next = bh->b_this_page; | |
342 | free_buffer_head(bh); | |
343 | bh = next; | |
77ad4bc7 | 344 | } |
d785a06a N |
345 | __clear_page_buffers(page); |
346 | put_page(page); | |
32a7627c N |
347 | } |
348 | ||
d785a06a N |
349 | /* read a page from a file. |
350 | * We both read the page, and attach buffers to the page to record the | |
351 | * address of each block (using bmap). These addresses will be used | |
352 | * to write the block later, completely bypassing the filesystem. | |
353 | * This usage is similar to how swap files are handled, and allows us | |
354 | * to write to a file with no concerns of memory allocation failing. | |
355 | */ | |
27581e5a N |
356 | static int read_page(struct file *file, unsigned long index, |
357 | struct bitmap *bitmap, | |
358 | unsigned long count, | |
359 | struct page *page) | |
32a7627c | 360 | { |
27581e5a | 361 | int ret = 0; |
496ad9aa | 362 | struct inode *inode = file_inode(file); |
d785a06a N |
363 | struct buffer_head *bh; |
364 | sector_t block; | |
32a7627c | 365 | |
36a4e1fe N |
366 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
367 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 368 | |
d785a06a N |
369 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
370 | if (!bh) { | |
27581e5a | 371 | ret = -ENOMEM; |
32a7627c N |
372 | goto out; |
373 | } | |
d785a06a N |
374 | attach_page_buffers(page, bh); |
375 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
376 | while (bh) { | |
377 | if (count == 0) | |
378 | bh->b_blocknr = 0; | |
379 | else { | |
380 | bh->b_blocknr = bmap(inode, block); | |
381 | if (bh->b_blocknr == 0) { | |
382 | /* Cannot use this file! */ | |
27581e5a | 383 | ret = -EINVAL; |
d785a06a N |
384 | goto out; |
385 | } | |
386 | bh->b_bdev = inode->i_sb->s_bdev; | |
387 | if (count < (1<<inode->i_blkbits)) | |
388 | count = 0; | |
389 | else | |
390 | count -= (1<<inode->i_blkbits); | |
391 | ||
392 | bh->b_end_io = end_bitmap_write; | |
393 | bh->b_private = bitmap; | |
ce25c31b N |
394 | atomic_inc(&bitmap->pending_writes); |
395 | set_buffer_locked(bh); | |
396 | set_buffer_mapped(bh); | |
397 | submit_bh(READ, bh); | |
d785a06a N |
398 | } |
399 | block++; | |
400 | bh = bh->b_this_page; | |
401 | } | |
d785a06a | 402 | page->index = index; |
ce25c31b N |
403 | |
404 | wait_event(bitmap->write_wait, | |
405 | atomic_read(&bitmap->pending_writes)==0); | |
b405fe91 | 406 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
27581e5a | 407 | ret = -EIO; |
32a7627c | 408 | out: |
27581e5a N |
409 | if (ret) |
410 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %llu): %d\n", | |
2d1f3b5d N |
411 | (int)PAGE_SIZE, |
412 | (unsigned long long)index << PAGE_SHIFT, | |
27581e5a N |
413 | ret); |
414 | return ret; | |
32a7627c N |
415 | } |
416 | ||
417 | /* | |
418 | * bitmap file superblock operations | |
419 | */ | |
420 | ||
421 | /* update the event counter and sync the superblock to disk */ | |
4ad13663 | 422 | void bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
423 | { |
424 | bitmap_super_t *sb; | |
32a7627c N |
425 | |
426 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 427 | return; |
ece5cff0 N |
428 | if (bitmap->mddev->bitmap_info.external) |
429 | return; | |
1ec885cd | 430 | if (!bitmap->storage.sb_page) /* no superblock */ |
4ad13663 | 431 | return; |
1ec885cd | 432 | sb = kmap_atomic(bitmap->storage.sb_page); |
32a7627c | 433 | sb->events = cpu_to_le64(bitmap->mddev->events); |
8258c532 | 434 | if (bitmap->mddev->events < bitmap->events_cleared) |
a0da84f3 NB |
435 | /* rocking back to read-only */ |
436 | bitmap->events_cleared = bitmap->mddev->events; | |
8258c532 N |
437 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
438 | sb->state = cpu_to_le32(bitmap->flags); | |
43a70507 N |
439 | /* Just in case these have been changed via sysfs: */ |
440 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
441 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
b81a0404 N |
442 | /* This might have been changed by a reshape */ |
443 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
444 | sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize); | |
c4ce867f | 445 | sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes); |
1dff2b87 N |
446 | sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> |
447 | bitmap_info.space); | |
b2f46e68 | 448 | kunmap_atomic(sb); |
1ec885cd | 449 | write_page(bitmap, bitmap->storage.sb_page, 1); |
32a7627c N |
450 | } |
451 | ||
452 | /* print out the bitmap file superblock */ | |
453 | void bitmap_print_sb(struct bitmap *bitmap) | |
454 | { | |
455 | bitmap_super_t *sb; | |
456 | ||
1ec885cd | 457 | if (!bitmap || !bitmap->storage.sb_page) |
32a7627c | 458 | return; |
1ec885cd | 459 | sb = kmap_atomic(bitmap->storage.sb_page); |
32a7627c | 460 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
461 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
462 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
463 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
464 | *(__u32 *)(sb->uuid+0), |
465 | *(__u32 *)(sb->uuid+4), | |
466 | *(__u32 *)(sb->uuid+8), | |
467 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 468 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 469 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 470 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 471 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
472 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
473 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
474 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
475 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
476 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 477 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
b2f46e68 | 478 | kunmap_atomic(sb); |
32a7627c N |
479 | } |
480 | ||
9c81075f JB |
481 | /* |
482 | * bitmap_new_disk_sb | |
483 | * @bitmap | |
484 | * | |
485 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb | |
486 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. | |
487 | * This function verifies 'bitmap_info' and populates the on-disk bitmap | |
488 | * structure, which is to be written to disk. | |
489 | * | |
490 | * Returns: 0 on success, -Exxx on error | |
491 | */ | |
492 | static int bitmap_new_disk_sb(struct bitmap *bitmap) | |
493 | { | |
494 | bitmap_super_t *sb; | |
495 | unsigned long chunksize, daemon_sleep, write_behind; | |
9c81075f | 496 | |
d3b178ad | 497 | bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
582e2e05 JM |
498 | if (bitmap->storage.sb_page == NULL) |
499 | return -ENOMEM; | |
1ec885cd | 500 | bitmap->storage.sb_page->index = 0; |
9c81075f | 501 | |
1ec885cd | 502 | sb = kmap_atomic(bitmap->storage.sb_page); |
9c81075f JB |
503 | |
504 | sb->magic = cpu_to_le32(BITMAP_MAGIC); | |
505 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); | |
506 | ||
507 | chunksize = bitmap->mddev->bitmap_info.chunksize; | |
508 | BUG_ON(!chunksize); | |
509 | if (!is_power_of_2(chunksize)) { | |
b2f46e68 | 510 | kunmap_atomic(sb); |
9c81075f JB |
511 | printk(KERN_ERR "bitmap chunksize not a power of 2\n"); |
512 | return -EINVAL; | |
513 | } | |
514 | sb->chunksize = cpu_to_le32(chunksize); | |
515 | ||
516 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; | |
517 | if (!daemon_sleep || | |
518 | (daemon_sleep < 1) || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { | |
519 | printk(KERN_INFO "Choosing daemon_sleep default (5 sec)\n"); | |
520 | daemon_sleep = 5 * HZ; | |
521 | } | |
522 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); | |
523 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
524 | ||
525 | /* | |
526 | * FIXME: write_behind for RAID1. If not specified, what | |
527 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. | |
528 | */ | |
529 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; | |
530 | if (write_behind > COUNTER_MAX) | |
531 | write_behind = COUNTER_MAX / 2; | |
532 | sb->write_behind = cpu_to_le32(write_behind); | |
533 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
534 | ||
535 | /* keep the array size field of the bitmap superblock up to date */ | |
536 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
537 | ||
538 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); | |
539 | ||
b405fe91 | 540 | set_bit(BITMAP_STALE, &bitmap->flags); |
84e92345 | 541 | sb->state = cpu_to_le32(bitmap->flags); |
9c81075f JB |
542 | bitmap->events_cleared = bitmap->mddev->events; |
543 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
d3b178ad | 544 | bitmap->mddev->bitmap_info.nodes = 0; |
9c81075f | 545 | |
b2f46e68 | 546 | kunmap_atomic(sb); |
9c81075f JB |
547 | |
548 | return 0; | |
549 | } | |
550 | ||
32a7627c N |
551 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
552 | static int bitmap_read_sb(struct bitmap *bitmap) | |
553 | { | |
554 | char *reason = NULL; | |
555 | bitmap_super_t *sb; | |
4b6d287f | 556 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c | 557 | unsigned long long events; |
c4ce867f | 558 | int nodes = 0; |
1dff2b87 | 559 | unsigned long sectors_reserved = 0; |
32a7627c | 560 | int err = -EINVAL; |
27581e5a | 561 | struct page *sb_page; |
33e38ac6 | 562 | loff_t offset = bitmap->mddev->bitmap_info.offset; |
32a7627c | 563 | |
1ec885cd | 564 | if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { |
ef99bf48 N |
565 | chunksize = 128 * 1024 * 1024; |
566 | daemon_sleep = 5 * HZ; | |
567 | write_behind = 0; | |
b405fe91 | 568 | set_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
569 | err = 0; |
570 | goto out_no_sb; | |
571 | } | |
32a7627c | 572 | /* page 0 is the superblock, read it... */ |
27581e5a N |
573 | sb_page = alloc_page(GFP_KERNEL); |
574 | if (!sb_page) | |
575 | return -ENOMEM; | |
1ec885cd | 576 | bitmap->storage.sb_page = sb_page; |
27581e5a | 577 | |
b97e9257 | 578 | re_read: |
f9209a32 GR |
579 | /* If cluster_slot is set, the cluster is setup */ |
580 | if (bitmap->cluster_slot >= 0) { | |
3b0e6aac | 581 | sector_t bm_blocks = bitmap->mddev->resync_max_sectors; |
f9209a32 | 582 | |
3b0e6aac SR |
583 | sector_div(bm_blocks, |
584 | bitmap->mddev->bitmap_info.chunksize >> 9); | |
124eb761 GR |
585 | /* bits to bytes */ |
586 | bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t); | |
587 | /* to 4k blocks */ | |
935f3d4f | 588 | bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096); |
33e38ac6 | 589 | offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3)); |
f9209a32 | 590 | pr_info("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__, |
33e38ac6 | 591 | bitmap->cluster_slot, offset); |
f9209a32 GR |
592 | } |
593 | ||
1ec885cd N |
594 | if (bitmap->storage.file) { |
595 | loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); | |
f49d5e62 N |
596 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
597 | ||
1ec885cd | 598 | err = read_page(bitmap->storage.file, 0, |
27581e5a | 599 | bitmap, bytes, sb_page); |
f49d5e62 | 600 | } else { |
27581e5a | 601 | err = read_sb_page(bitmap->mddev, |
33e38ac6 | 602 | offset, |
27581e5a N |
603 | sb_page, |
604 | 0, sizeof(bitmap_super_t)); | |
a654b9d8 | 605 | } |
27581e5a | 606 | if (err) |
32a7627c | 607 | return err; |
32a7627c | 608 | |
b97e9257 | 609 | err = -EINVAL; |
27581e5a | 610 | sb = kmap_atomic(sb_page); |
32a7627c | 611 | |
32a7627c | 612 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 613 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 614 | write_behind = le32_to_cpu(sb->write_behind); |
1dff2b87 | 615 | sectors_reserved = le32_to_cpu(sb->sectors_reserved); |
3c462c88 GR |
616 | /* Setup nodes/clustername only if bitmap version is |
617 | * cluster-compatible | |
d3b178ad | 618 | */ |
3c462c88 | 619 | if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) { |
d3b178ad GR |
620 | nodes = le32_to_cpu(sb->nodes); |
621 | strlcpy(bitmap->mddev->bitmap_info.cluster_name, | |
622 | sb->cluster_name, 64); | |
623 | } | |
32a7627c N |
624 | |
625 | /* verify that the bitmap-specific fields are valid */ | |
626 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
627 | reason = "bad magic"; | |
bd926c63 | 628 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
3c462c88 | 629 | le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED) |
32a7627c | 630 | reason = "unrecognized superblock version"; |
1187cf0a | 631 | else if (chunksize < 512) |
7dd5d34c | 632 | reason = "bitmap chunksize too small"; |
d744540c | 633 | else if (!is_power_of_2(chunksize)) |
32a7627c | 634 | reason = "bitmap chunksize not a power of 2"; |
1b04be96 | 635 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 636 | reason = "daemon sleep period out of range"; |
4b6d287f N |
637 | else if (write_behind > COUNTER_MAX) |
638 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
639 | if (reason) { |
640 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
641 | bmname(bitmap), reason); | |
642 | goto out; | |
643 | } | |
644 | ||
645 | /* keep the array size field of the bitmap superblock up to date */ | |
646 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
647 | ||
278c1ca2 N |
648 | if (bitmap->mddev->persistent) { |
649 | /* | |
650 | * We have a persistent array superblock, so compare the | |
651 | * bitmap's UUID and event counter to the mddev's | |
652 | */ | |
653 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
654 | printk(KERN_INFO | |
655 | "%s: bitmap superblock UUID mismatch\n", | |
656 | bmname(bitmap)); | |
657 | goto out; | |
658 | } | |
659 | events = le64_to_cpu(sb->events); | |
b97e9257 | 660 | if (!nodes && (events < bitmap->mddev->events)) { |
278c1ca2 N |
661 | printk(KERN_INFO |
662 | "%s: bitmap file is out of date (%llu < %llu) " | |
663 | "-- forcing full recovery\n", | |
664 | bmname(bitmap), events, | |
665 | (unsigned long long) bitmap->mddev->events); | |
b405fe91 | 666 | set_bit(BITMAP_STALE, &bitmap->flags); |
278c1ca2 | 667 | } |
32a7627c | 668 | } |
278c1ca2 | 669 | |
32a7627c | 670 | /* assign fields using values from superblock */ |
4f2e639a | 671 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 | 672 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
b405fe91 | 673 | set_bit(BITMAP_HOSTENDIAN, &bitmap->flags); |
32a7627c | 674 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
cf921cc1 | 675 | strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64); |
32a7627c | 676 | err = 0; |
b97e9257 | 677 | |
32a7627c | 678 | out: |
b2f46e68 | 679 | kunmap_atomic(sb); |
f9209a32 GR |
680 | /* Assiging chunksize is required for "re_read" */ |
681 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
f7357273 | 682 | if (err == 0 && nodes && (bitmap->cluster_slot < 0)) { |
b97e9257 GR |
683 | err = md_setup_cluster(bitmap->mddev, nodes); |
684 | if (err) { | |
685 | pr_err("%s: Could not setup cluster service (%d)\n", | |
686 | bmname(bitmap), err); | |
687 | goto out_no_sb; | |
688 | } | |
689 | bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev); | |
b97e9257 GR |
690 | goto re_read; |
691 | } | |
692 | ||
693 | ||
ef99bf48 | 694 | out_no_sb: |
b405fe91 | 695 | if (test_bit(BITMAP_STALE, &bitmap->flags)) |
ef99bf48 N |
696 | bitmap->events_cleared = bitmap->mddev->events; |
697 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
698 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
699 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
c4ce867f | 700 | bitmap->mddev->bitmap_info.nodes = nodes; |
1dff2b87 N |
701 | if (bitmap->mddev->bitmap_info.space == 0 || |
702 | bitmap->mddev->bitmap_info.space > sectors_reserved) | |
703 | bitmap->mddev->bitmap_info.space = sectors_reserved; | |
b97e9257 | 704 | if (err) { |
32a7627c | 705 | bitmap_print_sb(bitmap); |
f9209a32 | 706 | if (bitmap->cluster_slot < 0) |
b97e9257 GR |
707 | md_cluster_stop(bitmap->mddev); |
708 | } | |
32a7627c N |
709 | return err; |
710 | } | |
711 | ||
32a7627c N |
712 | /* |
713 | * general bitmap file operations | |
714 | */ | |
715 | ||
ece5cff0 N |
716 | /* |
717 | * on-disk bitmap: | |
718 | * | |
719 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
720 | * file a page at a time. There's a superblock at the start of the file. | |
721 | */ | |
32a7627c | 722 | /* calculate the index of the page that contains this bit */ |
1ec885cd N |
723 | static inline unsigned long file_page_index(struct bitmap_storage *store, |
724 | unsigned long chunk) | |
32a7627c | 725 | { |
1ec885cd | 726 | if (store->sb_page) |
ece5cff0 N |
727 | chunk += sizeof(bitmap_super_t) << 3; |
728 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
729 | } |
730 | ||
731 | /* calculate the (bit) offset of this bit within a page */ | |
1ec885cd N |
732 | static inline unsigned long file_page_offset(struct bitmap_storage *store, |
733 | unsigned long chunk) | |
32a7627c | 734 | { |
1ec885cd | 735 | if (store->sb_page) |
ece5cff0 N |
736 | chunk += sizeof(bitmap_super_t) << 3; |
737 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
738 | } |
739 | ||
740 | /* | |
741 | * return a pointer to the page in the filemap that contains the given bit | |
742 | * | |
32a7627c | 743 | */ |
1ec885cd | 744 | static inline struct page *filemap_get_page(struct bitmap_storage *store, |
3520fa4d | 745 | unsigned long chunk) |
32a7627c | 746 | { |
1ec885cd | 747 | if (file_page_index(store, chunk) >= store->file_pages) |
ac2f40be | 748 | return NULL; |
f2e06c58 | 749 | return store->filemap[file_page_index(store, chunk)]; |
32a7627c N |
750 | } |
751 | ||
d1244cb0 | 752 | static int bitmap_storage_alloc(struct bitmap_storage *store, |
b97e9257 GR |
753 | unsigned long chunks, int with_super, |
754 | int slot_number) | |
d1244cb0 | 755 | { |
b97e9257 | 756 | int pnum, offset = 0; |
d1244cb0 N |
757 | unsigned long num_pages; |
758 | unsigned long bytes; | |
759 | ||
760 | bytes = DIV_ROUND_UP(chunks, 8); | |
761 | if (with_super) | |
762 | bytes += sizeof(bitmap_super_t); | |
763 | ||
764 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); | |
b97e9257 | 765 | offset = slot_number * (num_pages - 1); |
d1244cb0 N |
766 | |
767 | store->filemap = kmalloc(sizeof(struct page *) | |
768 | * num_pages, GFP_KERNEL); | |
769 | if (!store->filemap) | |
770 | return -ENOMEM; | |
771 | ||
772 | if (with_super && !store->sb_page) { | |
d60b479d | 773 | store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
774 | if (store->sb_page == NULL) |
775 | return -ENOMEM; | |
d1244cb0 | 776 | } |
b97e9257 | 777 | |
d1244cb0 N |
778 | pnum = 0; |
779 | if (store->sb_page) { | |
780 | store->filemap[0] = store->sb_page; | |
781 | pnum = 1; | |
b97e9257 | 782 | store->sb_page->index = offset; |
d1244cb0 | 783 | } |
b97e9257 | 784 | |
d1244cb0 | 785 | for ( ; pnum < num_pages; pnum++) { |
d60b479d | 786 | store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
787 | if (!store->filemap[pnum]) { |
788 | store->file_pages = pnum; | |
789 | return -ENOMEM; | |
790 | } | |
b97e9257 | 791 | store->filemap[pnum]->index = pnum + offset; |
d1244cb0 N |
792 | } |
793 | store->file_pages = pnum; | |
794 | ||
795 | /* We need 4 bits per page, rounded up to a multiple | |
796 | * of sizeof(unsigned long) */ | |
797 | store->filemap_attr = kzalloc( | |
798 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), | |
799 | GFP_KERNEL); | |
800 | if (!store->filemap_attr) | |
801 | return -ENOMEM; | |
802 | ||
803 | store->bytes = bytes; | |
804 | ||
805 | return 0; | |
806 | } | |
807 | ||
fae7d326 | 808 | static void bitmap_file_unmap(struct bitmap_storage *store) |
32a7627c N |
809 | { |
810 | struct page **map, *sb_page; | |
32a7627c | 811 | int pages; |
fae7d326 | 812 | struct file *file; |
32a7627c | 813 | |
fae7d326 | 814 | file = store->file; |
1ec885cd | 815 | map = store->filemap; |
1ec885cd | 816 | pages = store->file_pages; |
1ec885cd | 817 | sb_page = store->sb_page; |
32a7627c N |
818 | |
819 | while (pages--) | |
ece5cff0 | 820 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 821 | free_buffers(map[pages]); |
32a7627c | 822 | kfree(map); |
fae7d326 | 823 | kfree(store->filemap_attr); |
32a7627c | 824 | |
d785a06a N |
825 | if (sb_page) |
826 | free_buffers(sb_page); | |
32a7627c | 827 | |
d785a06a | 828 | if (file) { |
496ad9aa | 829 | struct inode *inode = file_inode(file); |
fc0ecff6 | 830 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 831 | fput(file); |
d785a06a | 832 | } |
32a7627c N |
833 | } |
834 | ||
32a7627c N |
835 | /* |
836 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
837 | * then it is no longer reliable, so we stop using it and we mark the file | |
838 | * as failed in the superblock | |
839 | */ | |
840 | static void bitmap_file_kick(struct bitmap *bitmap) | |
841 | { | |
842 | char *path, *ptr = NULL; | |
843 | ||
b405fe91 | 844 | if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) { |
4ad13663 | 845 | bitmap_update_sb(bitmap); |
32a7627c | 846 | |
1ec885cd | 847 | if (bitmap->storage.file) { |
4ad13663 N |
848 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
849 | if (path) | |
9bf39ab2 | 850 | ptr = file_path(bitmap->storage.file, |
1ec885cd | 851 | path, PAGE_SIZE); |
6bcfd601 | 852 | |
4ad13663 N |
853 | printk(KERN_ALERT |
854 | "%s: kicking failed bitmap file %s from array!\n", | |
6bcfd601 | 855 | bmname(bitmap), IS_ERR(ptr) ? "" : ptr); |
32a7627c | 856 | |
4ad13663 N |
857 | kfree(path); |
858 | } else | |
859 | printk(KERN_ALERT | |
860 | "%s: disabling internal bitmap due to errors\n", | |
861 | bmname(bitmap)); | |
a654b9d8 | 862 | } |
32a7627c N |
863 | } |
864 | ||
865 | enum bitmap_page_attr { | |
ac2f40be | 866 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
5a537df4 N |
867 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
868 | * i.e. counter is 1 or 2. */ | |
ac2f40be | 869 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
32a7627c N |
870 | }; |
871 | ||
d189122d N |
872 | static inline void set_page_attr(struct bitmap *bitmap, int pnum, |
873 | enum bitmap_page_attr attr) | |
32a7627c | 874 | { |
bdfd1140 | 875 | set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
876 | } |
877 | ||
d189122d N |
878 | static inline void clear_page_attr(struct bitmap *bitmap, int pnum, |
879 | enum bitmap_page_attr attr) | |
32a7627c | 880 | { |
bdfd1140 | 881 | clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
882 | } |
883 | ||
bdfd1140 N |
884 | static inline int test_page_attr(struct bitmap *bitmap, int pnum, |
885 | enum bitmap_page_attr attr) | |
32a7627c | 886 | { |
1ec885cd | 887 | return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
888 | } |
889 | ||
bdfd1140 N |
890 | static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum, |
891 | enum bitmap_page_attr attr) | |
892 | { | |
893 | return test_and_clear_bit((pnum<<2) + attr, | |
894 | bitmap->storage.filemap_attr); | |
895 | } | |
32a7627c N |
896 | /* |
897 | * bitmap_file_set_bit -- called before performing a write to the md device | |
898 | * to set (and eventually sync) a particular bit in the bitmap file | |
899 | * | |
900 | * we set the bit immediately, then we record the page number so that | |
901 | * when an unplug occurs, we can flush the dirty pages out to disk | |
902 | */ | |
903 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
904 | { | |
905 | unsigned long bit; | |
3520fa4d | 906 | struct page *page; |
32a7627c | 907 | void *kaddr; |
40cffcc0 | 908 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
32a7627c | 909 | |
1ec885cd | 910 | page = filemap_get_page(&bitmap->storage, chunk); |
3520fa4d JB |
911 | if (!page) |
912 | return; | |
1ec885cd | 913 | bit = file_page_offset(&bitmap->storage, chunk); |
32a7627c | 914 | |
3520fa4d | 915 | /* set the bit */ |
b2f46e68 | 916 | kaddr = kmap_atomic(page); |
b405fe91 | 917 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
3520fa4d JB |
918 | set_bit(bit, kaddr); |
919 | else | |
3f810b6c | 920 | set_bit_le(bit, kaddr); |
b2f46e68 | 921 | kunmap_atomic(kaddr); |
36a4e1fe | 922 | pr_debug("set file bit %lu page %lu\n", bit, page->index); |
32a7627c | 923 | /* record page number so it gets flushed to disk when unplug occurs */ |
d189122d | 924 | set_page_attr(bitmap, page->index, BITMAP_PAGE_DIRTY); |
32a7627c N |
925 | } |
926 | ||
ef99bf48 N |
927 | static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) |
928 | { | |
929 | unsigned long bit; | |
930 | struct page *page; | |
931 | void *paddr; | |
40cffcc0 | 932 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
ef99bf48 | 933 | |
1ec885cd | 934 | page = filemap_get_page(&bitmap->storage, chunk); |
ef99bf48 N |
935 | if (!page) |
936 | return; | |
1ec885cd | 937 | bit = file_page_offset(&bitmap->storage, chunk); |
ef99bf48 | 938 | paddr = kmap_atomic(page); |
b405fe91 | 939 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
ef99bf48 N |
940 | clear_bit(bit, paddr); |
941 | else | |
3f810b6c | 942 | clear_bit_le(bit, paddr); |
ef99bf48 | 943 | kunmap_atomic(paddr); |
d189122d N |
944 | if (!test_page_attr(bitmap, page->index, BITMAP_PAGE_NEEDWRITE)) { |
945 | set_page_attr(bitmap, page->index, BITMAP_PAGE_PENDING); | |
ef99bf48 N |
946 | bitmap->allclean = 0; |
947 | } | |
948 | } | |
949 | ||
11dd35da GR |
950 | static int bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) |
951 | { | |
952 | unsigned long bit; | |
953 | struct page *page; | |
954 | void *paddr; | |
955 | unsigned long chunk = block >> bitmap->counts.chunkshift; | |
956 | int set = 0; | |
957 | ||
958 | page = filemap_get_page(&bitmap->storage, chunk); | |
959 | if (!page) | |
960 | return -EINVAL; | |
961 | bit = file_page_offset(&bitmap->storage, chunk); | |
962 | paddr = kmap_atomic(page); | |
963 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) | |
964 | set = test_bit(bit, paddr); | |
965 | else | |
966 | set = test_bit_le(bit, paddr); | |
967 | kunmap_atomic(paddr); | |
968 | return set; | |
969 | } | |
970 | ||
971 | ||
32a7627c N |
972 | /* this gets called when the md device is ready to unplug its underlying |
973 | * (slave) device queues -- before we let any writes go down, we need to | |
974 | * sync the dirty pages of the bitmap file to disk */ | |
4ad13663 | 975 | void bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 976 | { |
74667123 | 977 | unsigned long i; |
ec7a3197 | 978 | int dirty, need_write; |
32a7627c | 979 | |
62f82faa N |
980 | if (!bitmap || !bitmap->storage.filemap || |
981 | test_bit(BITMAP_STALE, &bitmap->flags)) | |
4ad13663 | 982 | return; |
32a7627c N |
983 | |
984 | /* look at each page to see if there are any set bits that need to be | |
985 | * flushed out to disk */ | |
1ec885cd | 986 | for (i = 0; i < bitmap->storage.file_pages; i++) { |
bdfd1140 | 987 | if (!bitmap->storage.filemap) |
4ad13663 | 988 | return; |
bdfd1140 N |
989 | dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
990 | need_write = test_and_clear_page_attr(bitmap, i, | |
991 | BITMAP_PAGE_NEEDWRITE); | |
992 | if (dirty || need_write) { | |
d189122d | 993 | clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); |
bdfd1140 N |
994 | write_page(bitmap, bitmap->storage.filemap[i], 0); |
995 | } | |
32a7627c | 996 | } |
4b5060dd N |
997 | if (bitmap->storage.file) |
998 | wait_event(bitmap->write_wait, | |
999 | atomic_read(&bitmap->pending_writes)==0); | |
1000 | else | |
1001 | md_super_wait(bitmap->mddev); | |
1002 | ||
b405fe91 | 1003 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
d785a06a | 1004 | bitmap_file_kick(bitmap); |
32a7627c | 1005 | } |
ac2f40be | 1006 | EXPORT_SYMBOL(bitmap_unplug); |
32a7627c | 1007 | |
6a07997f | 1008 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
1009 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
1010 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
1011 | * memory mapping of the bitmap file | |
1012 | * Special cases: | |
1013 | * if there's no bitmap file, or if the bitmap file had been | |
1014 | * previously kicked from the array, we mark all the bits as | |
1015 | * 1's in order to cause a full resync. | |
6a07997f N |
1016 | * |
1017 | * We ignore all bits for sectors that end earlier than 'start'. | |
1018 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 1019 | */ |
6a07997f | 1020 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c | 1021 | { |
b97e9257 | 1022 | unsigned long i, chunks, index, oldindex, bit, node_offset = 0; |
27581e5a | 1023 | struct page *page = NULL; |
d1244cb0 | 1024 | unsigned long bit_cnt = 0; |
32a7627c | 1025 | struct file *file; |
d1244cb0 | 1026 | unsigned long offset; |
32a7627c N |
1027 | int outofdate; |
1028 | int ret = -ENOSPC; | |
ea03aff9 | 1029 | void *paddr; |
1ec885cd | 1030 | struct bitmap_storage *store = &bitmap->storage; |
32a7627c | 1031 | |
40cffcc0 | 1032 | chunks = bitmap->counts.chunks; |
1ec885cd | 1033 | file = store->file; |
32a7627c | 1034 | |
ef99bf48 N |
1035 | if (!file && !bitmap->mddev->bitmap_info.offset) { |
1036 | /* No permanent bitmap - fill with '1s'. */ | |
1ec885cd N |
1037 | store->filemap = NULL; |
1038 | store->file_pages = 0; | |
ef99bf48 N |
1039 | for (i = 0; i < chunks ; i++) { |
1040 | /* if the disk bit is set, set the memory bit */ | |
40cffcc0 | 1041 | int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift) |
ef99bf48 N |
1042 | >= start); |
1043 | bitmap_set_memory_bits(bitmap, | |
40cffcc0 | 1044 | (sector_t)i << bitmap->counts.chunkshift, |
ef99bf48 N |
1045 | needed); |
1046 | } | |
1047 | return 0; | |
1048 | } | |
32a7627c | 1049 | |
b405fe91 | 1050 | outofdate = test_bit(BITMAP_STALE, &bitmap->flags); |
32a7627c N |
1051 | if (outofdate) |
1052 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
1053 | "recovery\n", bmname(bitmap)); | |
1054 | ||
d1244cb0 | 1055 | if (file && i_size_read(file->f_mapping->host) < store->bytes) { |
32a7627c | 1056 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
d1244cb0 N |
1057 | bmname(bitmap), |
1058 | (unsigned long) i_size_read(file->f_mapping->host), | |
1059 | store->bytes); | |
4ad13663 | 1060 | goto err; |
32a7627c | 1061 | } |
bc7f77de | 1062 | |
d1244cb0 | 1063 | oldindex = ~0L; |
27581e5a | 1064 | offset = 0; |
d1244cb0 | 1065 | if (!bitmap->mddev->bitmap_info.external) |
27581e5a | 1066 | offset = sizeof(bitmap_super_t); |
32a7627c | 1067 | |
b97e9257 GR |
1068 | if (mddev_is_clustered(bitmap->mddev)) |
1069 | node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE)); | |
1070 | ||
32a7627c | 1071 | for (i = 0; i < chunks; i++) { |
bd926c63 | 1072 | int b; |
1ec885cd N |
1073 | index = file_page_index(&bitmap->storage, i); |
1074 | bit = file_page_offset(&bitmap->storage, i); | |
32a7627c | 1075 | if (index != oldindex) { /* this is a new page, read it in */ |
d785a06a | 1076 | int count; |
32a7627c | 1077 | /* unmap the old page, we're done with it */ |
d1244cb0 N |
1078 | if (index == store->file_pages-1) |
1079 | count = store->bytes - index * PAGE_SIZE; | |
d785a06a N |
1080 | else |
1081 | count = PAGE_SIZE; | |
1ec885cd | 1082 | page = store->filemap[index]; |
27581e5a N |
1083 | if (file) |
1084 | ret = read_page(file, index, bitmap, | |
1085 | count, page); | |
1086 | else | |
1087 | ret = read_sb_page( | |
1088 | bitmap->mddev, | |
1089 | bitmap->mddev->bitmap_info.offset, | |
1090 | page, | |
b97e9257 | 1091 | index + node_offset, count); |
27581e5a N |
1092 | |
1093 | if (ret) | |
4ad13663 | 1094 | goto err; |
a654b9d8 | 1095 | |
32a7627c | 1096 | oldindex = index; |
32a7627c N |
1097 | |
1098 | if (outofdate) { | |
1099 | /* | |
1100 | * if bitmap is out of date, dirty the | |
ac2f40be | 1101 | * whole page and write it out |
32a7627c | 1102 | */ |
b2f46e68 | 1103 | paddr = kmap_atomic(page); |
ea03aff9 | 1104 | memset(paddr + offset, 0xff, |
6a07997f | 1105 | PAGE_SIZE - offset); |
b2f46e68 | 1106 | kunmap_atomic(paddr); |
4ad13663 N |
1107 | write_page(bitmap, page, 1); |
1108 | ||
1109 | ret = -EIO; | |
b405fe91 N |
1110 | if (test_bit(BITMAP_WRITE_ERROR, |
1111 | &bitmap->flags)) | |
4ad13663 | 1112 | goto err; |
32a7627c | 1113 | } |
32a7627c | 1114 | } |
b2f46e68 | 1115 | paddr = kmap_atomic(page); |
b405fe91 | 1116 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
ea03aff9 | 1117 | b = test_bit(bit, paddr); |
bd926c63 | 1118 | else |
6b33aff3 | 1119 | b = test_bit_le(bit, paddr); |
b2f46e68 | 1120 | kunmap_atomic(paddr); |
bd926c63 | 1121 | if (b) { |
32a7627c | 1122 | /* if the disk bit is set, set the memory bit */ |
40cffcc0 | 1123 | int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift |
db305e50 N |
1124 | >= start); |
1125 | bitmap_set_memory_bits(bitmap, | |
40cffcc0 | 1126 | (sector_t)i << bitmap->counts.chunkshift, |
db305e50 | 1127 | needed); |
32a7627c N |
1128 | bit_cnt++; |
1129 | } | |
27581e5a | 1130 | offset = 0; |
32a7627c N |
1131 | } |
1132 | ||
32a7627c | 1133 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
d1244cb0 | 1134 | "read %lu pages, set %lu of %lu bits\n", |
1ec885cd | 1135 | bmname(bitmap), store->file_pages, |
d1244cb0 | 1136 | bit_cnt, chunks); |
4ad13663 N |
1137 | |
1138 | return 0; | |
32a7627c | 1139 | |
4ad13663 N |
1140 | err: |
1141 | printk(KERN_INFO "%s: bitmap initialisation failed: %d\n", | |
1142 | bmname(bitmap), ret); | |
32a7627c N |
1143 | return ret; |
1144 | } | |
1145 | ||
a654b9d8 N |
1146 | void bitmap_write_all(struct bitmap *bitmap) |
1147 | { | |
1148 | /* We don't actually write all bitmap blocks here, | |
1149 | * just flag them as needing to be written | |
1150 | */ | |
ec7a3197 | 1151 | int i; |
a654b9d8 | 1152 | |
1ec885cd | 1153 | if (!bitmap || !bitmap->storage.filemap) |
ef99bf48 | 1154 | return; |
1ec885cd | 1155 | if (bitmap->storage.file) |
ef99bf48 N |
1156 | /* Only one copy, so nothing needed */ |
1157 | return; | |
1158 | ||
1ec885cd | 1159 | for (i = 0; i < bitmap->storage.file_pages; i++) |
d189122d | 1160 | set_page_attr(bitmap, i, |
ec7a3197 | 1161 | BITMAP_PAGE_NEEDWRITE); |
2585f3ef | 1162 | bitmap->allclean = 0; |
a654b9d8 N |
1163 | } |
1164 | ||
40cffcc0 N |
1165 | static void bitmap_count_page(struct bitmap_counts *bitmap, |
1166 | sector_t offset, int inc) | |
32a7627c | 1167 | { |
61a0d80c | 1168 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1169 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1170 | bitmap->bp[page].count += inc; | |
32a7627c N |
1171 | bitmap_checkfree(bitmap, page); |
1172 | } | |
bf07bb7d | 1173 | |
40cffcc0 | 1174 | static void bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset) |
bf07bb7d N |
1175 | { |
1176 | sector_t chunk = offset >> bitmap->chunkshift; | |
1177 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1178 | struct bitmap_page *bp = &bitmap->bp[page]; | |
1179 | ||
1180 | if (!bp->pending) | |
1181 | bp->pending = 1; | |
1182 | } | |
1183 | ||
40cffcc0 | 1184 | static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, |
57dab0bd | 1185 | sector_t offset, sector_t *blocks, |
32a7627c N |
1186 | int create); |
1187 | ||
1188 | /* | |
1189 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1190 | * out to disk | |
1191 | */ | |
1192 | ||
fd01b88c | 1193 | void bitmap_daemon_work(struct mddev *mddev) |
32a7627c | 1194 | { |
aa5cbd10 | 1195 | struct bitmap *bitmap; |
aa3163f8 | 1196 | unsigned long j; |
bf07bb7d | 1197 | unsigned long nextpage; |
57dab0bd | 1198 | sector_t blocks; |
40cffcc0 | 1199 | struct bitmap_counts *counts; |
32a7627c | 1200 | |
aa5cbd10 N |
1201 | /* Use a mutex to guard daemon_work against |
1202 | * bitmap_destroy. | |
1203 | */ | |
c3d9714e | 1204 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1205 | bitmap = mddev->bitmap; |
1206 | if (bitmap == NULL) { | |
c3d9714e | 1207 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1208 | return; |
aa5cbd10 | 1209 | } |
42a04b50 | 1210 | if (time_before(jiffies, bitmap->daemon_lastrun |
2e61ebbc | 1211 | + mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1212 | goto done; |
1213 | ||
32a7627c | 1214 | bitmap->daemon_lastrun = jiffies; |
8311c29d | 1215 | if (bitmap->allclean) { |
2e61ebbc | 1216 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
aa5cbd10 | 1217 | goto done; |
8311c29d N |
1218 | } |
1219 | bitmap->allclean = 1; | |
32a7627c | 1220 | |
bf07bb7d N |
1221 | /* Any file-page which is PENDING now needs to be written. |
1222 | * So set NEEDWRITE now, then after we make any last-minute changes | |
1223 | * we will write it. | |
1224 | */ | |
1ec885cd | 1225 | for (j = 0; j < bitmap->storage.file_pages; j++) |
bdfd1140 N |
1226 | if (test_and_clear_page_attr(bitmap, j, |
1227 | BITMAP_PAGE_PENDING)) | |
d189122d | 1228 | set_page_attr(bitmap, j, |
bf07bb7d | 1229 | BITMAP_PAGE_NEEDWRITE); |
bf07bb7d N |
1230 | |
1231 | if (bitmap->need_sync && | |
1232 | mddev->bitmap_info.external == 0) { | |
1233 | /* Arrange for superblock update as well as | |
1234 | * other changes */ | |
1235 | bitmap_super_t *sb; | |
1236 | bitmap->need_sync = 0; | |
1ec885cd N |
1237 | if (bitmap->storage.filemap) { |
1238 | sb = kmap_atomic(bitmap->storage.sb_page); | |
ef99bf48 N |
1239 | sb->events_cleared = |
1240 | cpu_to_le64(bitmap->events_cleared); | |
1241 | kunmap_atomic(sb); | |
d189122d | 1242 | set_page_attr(bitmap, 0, |
ef99bf48 N |
1243 | BITMAP_PAGE_NEEDWRITE); |
1244 | } | |
bf07bb7d N |
1245 | } |
1246 | /* Now look at the bitmap counters and if any are '2' or '1', | |
1247 | * decrement and handle accordingly. | |
1248 | */ | |
40cffcc0 N |
1249 | counts = &bitmap->counts; |
1250 | spin_lock_irq(&counts->lock); | |
bf07bb7d | 1251 | nextpage = 0; |
40cffcc0 | 1252 | for (j = 0; j < counts->chunks; j++) { |
32a7627c | 1253 | bitmap_counter_t *bmc; |
40cffcc0 | 1254 | sector_t block = (sector_t)j << counts->chunkshift; |
3520fa4d | 1255 | |
bf07bb7d N |
1256 | if (j == nextpage) { |
1257 | nextpage += PAGE_COUNTER_RATIO; | |
40cffcc0 | 1258 | if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) { |
bf07bb7d | 1259 | j |= PAGE_COUNTER_MASK; |
aa3163f8 N |
1260 | continue; |
1261 | } | |
40cffcc0 | 1262 | counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; |
32a7627c | 1263 | } |
40cffcc0 | 1264 | bmc = bitmap_get_counter(counts, |
ef99bf48 | 1265 | block, |
db305e50 | 1266 | &blocks, 0); |
bf07bb7d N |
1267 | |
1268 | if (!bmc) { | |
5a537df4 | 1269 | j |= PAGE_COUNTER_MASK; |
bf07bb7d N |
1270 | continue; |
1271 | } | |
1272 | if (*bmc == 1 && !bitmap->need_sync) { | |
1273 | /* We can clear the bit */ | |
bf07bb7d | 1274 | *bmc = 0; |
40cffcc0 | 1275 | bitmap_count_page(counts, block, -1); |
ef99bf48 | 1276 | bitmap_file_clear_bit(bitmap, block); |
bf07bb7d N |
1277 | } else if (*bmc && *bmc <= 2) { |
1278 | *bmc = 1; | |
40cffcc0 | 1279 | bitmap_set_pending(counts, block); |
bf07bb7d | 1280 | bitmap->allclean = 0; |
5a537df4 | 1281 | } |
32a7627c | 1282 | } |
40cffcc0 | 1283 | spin_unlock_irq(&counts->lock); |
32a7627c | 1284 | |
bf07bb7d N |
1285 | /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. |
1286 | * DIRTY pages need to be written by bitmap_unplug so it can wait | |
1287 | * for them. | |
1288 | * If we find any DIRTY page we stop there and let bitmap_unplug | |
1289 | * handle all the rest. This is important in the case where | |
1290 | * the first blocking holds the superblock and it has been updated. | |
1291 | * We mustn't write any other blocks before the superblock. | |
1292 | */ | |
62f82faa N |
1293 | for (j = 0; |
1294 | j < bitmap->storage.file_pages | |
1295 | && !test_bit(BITMAP_STALE, &bitmap->flags); | |
1296 | j++) { | |
d189122d | 1297 | if (test_page_attr(bitmap, j, |
bf07bb7d N |
1298 | BITMAP_PAGE_DIRTY)) |
1299 | /* bitmap_unplug will handle the rest */ | |
1300 | break; | |
bdfd1140 N |
1301 | if (test_and_clear_page_attr(bitmap, j, |
1302 | BITMAP_PAGE_NEEDWRITE)) { | |
1ec885cd | 1303 | write_page(bitmap, bitmap->storage.filemap[j], 0); |
32a7627c | 1304 | } |
32a7627c N |
1305 | } |
1306 | ||
7be3dfec | 1307 | done: |
8311c29d | 1308 | if (bitmap->allclean == 0) |
2e61ebbc N |
1309 | mddev->thread->timeout = |
1310 | mddev->bitmap_info.daemon_sleep; | |
c3d9714e | 1311 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1312 | } |
1313 | ||
40cffcc0 | 1314 | static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, |
57dab0bd | 1315 | sector_t offset, sector_t *blocks, |
32a7627c | 1316 | int create) |
ee305ace N |
1317 | __releases(bitmap->lock) |
1318 | __acquires(bitmap->lock) | |
32a7627c N |
1319 | { |
1320 | /* If 'create', we might release the lock and reclaim it. | |
1321 | * The lock must have been taken with interrupts enabled. | |
1322 | * If !create, we don't release the lock. | |
1323 | */ | |
61a0d80c | 1324 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1325 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1326 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1327 | sector_t csize; | |
ef425673 | 1328 | int err; |
32a7627c | 1329 | |
ef425673 N |
1330 | err = bitmap_checkpage(bitmap, page, create); |
1331 | ||
1332 | if (bitmap->bp[page].hijacked || | |
1333 | bitmap->bp[page].map == NULL) | |
61a0d80c | 1334 | csize = ((sector_t)1) << (bitmap->chunkshift + |
ef425673 N |
1335 | PAGE_COUNTER_SHIFT - 1); |
1336 | else | |
61a0d80c | 1337 | csize = ((sector_t)1) << bitmap->chunkshift; |
ef425673 N |
1338 | *blocks = csize - (offset & (csize - 1)); |
1339 | ||
1340 | if (err < 0) | |
32a7627c | 1341 | return NULL; |
ef425673 | 1342 | |
32a7627c N |
1343 | /* now locked ... */ |
1344 | ||
1345 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1346 | /* should we use the first or second counter field | |
1347 | * of the hijacked pointer? */ | |
1348 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
32a7627c N |
1349 | return &((bitmap_counter_t *) |
1350 | &bitmap->bp[page].map)[hi]; | |
ef425673 | 1351 | } else /* page is allocated */ |
32a7627c N |
1352 | return (bitmap_counter_t *) |
1353 | &(bitmap->bp[page].map[pageoff]); | |
32a7627c N |
1354 | } |
1355 | ||
4b6d287f | 1356 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1357 | { |
ac2f40be N |
1358 | if (!bitmap) |
1359 | return 0; | |
4b6d287f N |
1360 | |
1361 | if (behind) { | |
696fcd53 | 1362 | int bw; |
4b6d287f | 1363 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1364 | bw = atomic_read(&bitmap->behind_writes); |
1365 | if (bw > bitmap->behind_writes_used) | |
1366 | bitmap->behind_writes_used = bw; | |
1367 | ||
36a4e1fe N |
1368 | pr_debug("inc write-behind count %d/%lu\n", |
1369 | bw, bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1370 | } |
1371 | ||
32a7627c | 1372 | while (sectors) { |
57dab0bd | 1373 | sector_t blocks; |
32a7627c N |
1374 | bitmap_counter_t *bmc; |
1375 | ||
40cffcc0 N |
1376 | spin_lock_irq(&bitmap->counts.lock); |
1377 | bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 1); | |
32a7627c | 1378 | if (!bmc) { |
40cffcc0 | 1379 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1380 | return 0; |
1381 | } | |
1382 | ||
27d5ea04 | 1383 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
da6e1a32 NB |
1384 | DEFINE_WAIT(__wait); |
1385 | /* note that it is safe to do the prepare_to_wait | |
1386 | * after the test as long as we do it before dropping | |
1387 | * the spinlock. | |
1388 | */ | |
1389 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1390 | TASK_UNINTERRUPTIBLE); | |
40cffcc0 | 1391 | spin_unlock_irq(&bitmap->counts.lock); |
f54a9d0e | 1392 | schedule(); |
da6e1a32 NB |
1393 | finish_wait(&bitmap->overflow_wait, &__wait); |
1394 | continue; | |
1395 | } | |
1396 | ||
ac2f40be | 1397 | switch (*bmc) { |
32a7627c N |
1398 | case 0: |
1399 | bitmap_file_set_bit(bitmap, offset); | |
40cffcc0 | 1400 | bitmap_count_page(&bitmap->counts, offset, 1); |
32a7627c N |
1401 | /* fall through */ |
1402 | case 1: | |
1403 | *bmc = 2; | |
1404 | } | |
da6e1a32 | 1405 | |
32a7627c N |
1406 | (*bmc)++; |
1407 | ||
40cffcc0 | 1408 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1409 | |
1410 | offset += blocks; | |
1411 | if (sectors > blocks) | |
1412 | sectors -= blocks; | |
ac2f40be N |
1413 | else |
1414 | sectors = 0; | |
32a7627c N |
1415 | } |
1416 | return 0; | |
1417 | } | |
ac2f40be | 1418 | EXPORT_SYMBOL(bitmap_startwrite); |
32a7627c N |
1419 | |
1420 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1421 | int success, int behind) |
32a7627c | 1422 | { |
ac2f40be N |
1423 | if (!bitmap) |
1424 | return; | |
4b6d287f | 1425 | if (behind) { |
e555190d N |
1426 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1427 | wake_up(&bitmap->behind_wait); | |
36a4e1fe N |
1428 | pr_debug("dec write-behind count %d/%lu\n", |
1429 | atomic_read(&bitmap->behind_writes), | |
1430 | bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1431 | } |
1432 | ||
32a7627c | 1433 | while (sectors) { |
57dab0bd | 1434 | sector_t blocks; |
32a7627c N |
1435 | unsigned long flags; |
1436 | bitmap_counter_t *bmc; | |
1437 | ||
40cffcc0 N |
1438 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
1439 | bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 0); | |
32a7627c | 1440 | if (!bmc) { |
40cffcc0 | 1441 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1442 | return; |
1443 | } | |
1444 | ||
961902c0 | 1445 | if (success && !bitmap->mddev->degraded && |
a0da84f3 NB |
1446 | bitmap->events_cleared < bitmap->mddev->events) { |
1447 | bitmap->events_cleared = bitmap->mddev->events; | |
1448 | bitmap->need_sync = 1; | |
5ff5afff | 1449 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1450 | } |
1451 | ||
27d5ea04 | 1452 | if (!success && !NEEDED(*bmc)) |
32a7627c N |
1453 | *bmc |= NEEDED_MASK; |
1454 | ||
27d5ea04 | 1455 | if (COUNTER(*bmc) == COUNTER_MAX) |
da6e1a32 NB |
1456 | wake_up(&bitmap->overflow_wait); |
1457 | ||
32a7627c | 1458 | (*bmc)--; |
2585f3ef | 1459 | if (*bmc <= 2) { |
40cffcc0 | 1460 | bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1461 | bitmap->allclean = 0; |
1462 | } | |
40cffcc0 | 1463 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1464 | offset += blocks; |
1465 | if (sectors > blocks) | |
1466 | sectors -= blocks; | |
ac2f40be N |
1467 | else |
1468 | sectors = 0; | |
32a7627c N |
1469 | } |
1470 | } | |
ac2f40be | 1471 | EXPORT_SYMBOL(bitmap_endwrite); |
32a7627c | 1472 | |
57dab0bd | 1473 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a | 1474 | int degraded) |
32a7627c N |
1475 | { |
1476 | bitmap_counter_t *bmc; | |
1477 | int rv; | |
1478 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1479 | *blocks = 1024; | |
1480 | return 1; /* always resync if no bitmap */ | |
1481 | } | |
40cffcc0 N |
1482 | spin_lock_irq(&bitmap->counts.lock); |
1483 | bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); | |
32a7627c N |
1484 | rv = 0; |
1485 | if (bmc) { | |
1486 | /* locked */ | |
1487 | if (RESYNC(*bmc)) | |
1488 | rv = 1; | |
1489 | else if (NEEDED(*bmc)) { | |
1490 | rv = 1; | |
6a806c51 N |
1491 | if (!degraded) { /* don't set/clear bits if degraded */ |
1492 | *bmc |= RESYNC_MASK; | |
1493 | *bmc &= ~NEEDED_MASK; | |
1494 | } | |
32a7627c N |
1495 | } |
1496 | } | |
40cffcc0 | 1497 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1498 | return rv; |
1499 | } | |
1500 | ||
57dab0bd | 1501 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a N |
1502 | int degraded) |
1503 | { | |
1504 | /* bitmap_start_sync must always report on multiples of whole | |
1505 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1506 | * get confused. | |
1507 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1508 | * At least PAGE_SIZE>>9 blocks are covered. | |
1509 | * Return the 'or' of the result. | |
1510 | */ | |
1511 | int rv = 0; | |
57dab0bd | 1512 | sector_t blocks1; |
1187cf0a N |
1513 | |
1514 | *blocks = 0; | |
1515 | while (*blocks < (PAGE_SIZE>>9)) { | |
1516 | rv |= __bitmap_start_sync(bitmap, offset, | |
1517 | &blocks1, degraded); | |
1518 | offset += blocks1; | |
1519 | *blocks += blocks1; | |
1520 | } | |
1521 | return rv; | |
1522 | } | |
ac2f40be | 1523 | EXPORT_SYMBOL(bitmap_start_sync); |
1187cf0a | 1524 | |
57dab0bd | 1525 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
32a7627c N |
1526 | { |
1527 | bitmap_counter_t *bmc; | |
1528 | unsigned long flags; | |
ac2f40be N |
1529 | |
1530 | if (bitmap == NULL) { | |
32a7627c N |
1531 | *blocks = 1024; |
1532 | return; | |
1533 | } | |
40cffcc0 N |
1534 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
1535 | bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); | |
32a7627c N |
1536 | if (bmc == NULL) |
1537 | goto unlock; | |
1538 | /* locked */ | |
32a7627c N |
1539 | if (RESYNC(*bmc)) { |
1540 | *bmc &= ~RESYNC_MASK; | |
1541 | ||
1542 | if (!NEEDED(*bmc) && aborted) | |
1543 | *bmc |= NEEDED_MASK; | |
1544 | else { | |
2585f3ef | 1545 | if (*bmc <= 2) { |
40cffcc0 | 1546 | bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1547 | bitmap->allclean = 0; |
1548 | } | |
32a7627c N |
1549 | } |
1550 | } | |
1551 | unlock: | |
40cffcc0 | 1552 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c | 1553 | } |
ac2f40be | 1554 | EXPORT_SYMBOL(bitmap_end_sync); |
32a7627c N |
1555 | |
1556 | void bitmap_close_sync(struct bitmap *bitmap) | |
1557 | { | |
1558 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1559 | * properly have been aborted. It remains to us to clear the | |
1560 | * RESYNC bit wherever it is still on | |
1561 | */ | |
1562 | sector_t sector = 0; | |
57dab0bd | 1563 | sector_t blocks; |
b47490c9 N |
1564 | if (!bitmap) |
1565 | return; | |
32a7627c N |
1566 | while (sector < bitmap->mddev->resync_max_sectors) { |
1567 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
b47490c9 N |
1568 | sector += blocks; |
1569 | } | |
1570 | } | |
ac2f40be | 1571 | EXPORT_SYMBOL(bitmap_close_sync); |
b47490c9 | 1572 | |
c40f341f | 1573 | void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force) |
b47490c9 N |
1574 | { |
1575 | sector_t s = 0; | |
57dab0bd | 1576 | sector_t blocks; |
b47490c9 N |
1577 | |
1578 | if (!bitmap) | |
1579 | return; | |
1580 | if (sector == 0) { | |
1581 | bitmap->last_end_sync = jiffies; | |
1582 | return; | |
1583 | } | |
c40f341f | 1584 | if (!force && time_before(jiffies, (bitmap->last_end_sync |
1b04be96 | 1585 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1586 | return; |
1587 | wait_event(bitmap->mddev->recovery_wait, | |
1588 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1589 | ||
75d3da43 | 1590 | bitmap->mddev->curr_resync_completed = sector; |
070dc6dd | 1591 | set_bit(MD_CHANGE_CLEAN, &bitmap->mddev->flags); |
40cffcc0 | 1592 | sector &= ~((1ULL << bitmap->counts.chunkshift) - 1); |
b47490c9 N |
1593 | s = 0; |
1594 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
1595 | bitmap_end_sync(bitmap, s, &blocks, 0); | |
1596 | s += blocks; | |
32a7627c | 1597 | } |
b47490c9 | 1598 | bitmap->last_end_sync = jiffies; |
acb180b0 | 1599 | sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); |
32a7627c | 1600 | } |
ac2f40be | 1601 | EXPORT_SYMBOL(bitmap_cond_end_sync); |
32a7627c | 1602 | |
6a07997f | 1603 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1604 | { |
1605 | /* For each chunk covered by any of these sectors, set the | |
ef99bf48 | 1606 | * counter to 2 and possibly set resync_needed. They should all |
32a7627c N |
1607 | * be 0 at this point |
1608 | */ | |
193f1c93 | 1609 | |
57dab0bd | 1610 | sector_t secs; |
193f1c93 | 1611 | bitmap_counter_t *bmc; |
40cffcc0 N |
1612 | spin_lock_irq(&bitmap->counts.lock); |
1613 | bmc = bitmap_get_counter(&bitmap->counts, offset, &secs, 1); | |
193f1c93 | 1614 | if (!bmc) { |
40cffcc0 | 1615 | spin_unlock_irq(&bitmap->counts.lock); |
193f1c93 | 1616 | return; |
32a7627c | 1617 | } |
ac2f40be | 1618 | if (!*bmc) { |
11dd35da | 1619 | *bmc = 2; |
40cffcc0 N |
1620 | bitmap_count_page(&bitmap->counts, offset, 1); |
1621 | bitmap_set_pending(&bitmap->counts, offset); | |
2585f3ef | 1622 | bitmap->allclean = 0; |
193f1c93 | 1623 | } |
11dd35da GR |
1624 | if (needed) |
1625 | *bmc |= NEEDED_MASK; | |
40cffcc0 | 1626 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1627 | } |
1628 | ||
9b1d1dac PC |
1629 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
1630 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) | |
1631 | { | |
1632 | unsigned long chunk; | |
1633 | ||
1634 | for (chunk = s; chunk <= e; chunk++) { | |
40cffcc0 | 1635 | sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift; |
9b1d1dac PC |
1636 | bitmap_set_memory_bits(bitmap, sec, 1); |
1637 | bitmap_file_set_bit(bitmap, sec); | |
ffa23322 N |
1638 | if (sec < bitmap->mddev->recovery_cp) |
1639 | /* We are asserting that the array is dirty, | |
1640 | * so move the recovery_cp address back so | |
1641 | * that it is obvious that it is dirty | |
1642 | */ | |
1643 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1644 | } |
1645 | } | |
1646 | ||
6b8b3e8a N |
1647 | /* |
1648 | * flush out any pending updates | |
1649 | */ | |
fd01b88c | 1650 | void bitmap_flush(struct mddev *mddev) |
6b8b3e8a N |
1651 | { |
1652 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1653 | long sleep; |
6b8b3e8a N |
1654 | |
1655 | if (!bitmap) /* there was no bitmap */ | |
1656 | return; | |
1657 | ||
1658 | /* run the daemon_work three time to ensure everything is flushed | |
1659 | * that can be | |
1660 | */ | |
1b04be96 | 1661 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1662 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1663 | bitmap_daemon_work(mddev); |
42a04b50 | 1664 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1665 | bitmap_daemon_work(mddev); |
42a04b50 | 1666 | bitmap->daemon_lastrun -= sleep; |
aa5cbd10 | 1667 | bitmap_daemon_work(mddev); |
6b8b3e8a N |
1668 | bitmap_update_sb(bitmap); |
1669 | } | |
1670 | ||
32a7627c N |
1671 | /* |
1672 | * free memory that was allocated | |
1673 | */ | |
3178b0db | 1674 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1675 | { |
1676 | unsigned long k, pages; | |
1677 | struct bitmap_page *bp; | |
32a7627c N |
1678 | |
1679 | if (!bitmap) /* there was no bitmap */ | |
1680 | return; | |
1681 | ||
f9209a32 GR |
1682 | if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info && |
1683 | bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev)) | |
b97e9257 GR |
1684 | md_cluster_stop(bitmap->mddev); |
1685 | ||
fae7d326 N |
1686 | /* Shouldn't be needed - but just in case.... */ |
1687 | wait_event(bitmap->write_wait, | |
1688 | atomic_read(&bitmap->pending_writes) == 0); | |
1689 | ||
1690 | /* release the bitmap file */ | |
1691 | bitmap_file_unmap(&bitmap->storage); | |
32a7627c | 1692 | |
40cffcc0 N |
1693 | bp = bitmap->counts.bp; |
1694 | pages = bitmap->counts.pages; | |
32a7627c N |
1695 | |
1696 | /* free all allocated memory */ | |
1697 | ||
32a7627c N |
1698 | if (bp) /* deallocate the page memory */ |
1699 | for (k = 0; k < pages; k++) | |
1700 | if (bp[k].map && !bp[k].hijacked) | |
1701 | kfree(bp[k].map); | |
1702 | kfree(bp); | |
1703 | kfree(bitmap); | |
1704 | } | |
aa5cbd10 | 1705 | |
fd01b88c | 1706 | void bitmap_destroy(struct mddev *mddev) |
3178b0db N |
1707 | { |
1708 | struct bitmap *bitmap = mddev->bitmap; | |
1709 | ||
1710 | if (!bitmap) /* there was no bitmap */ | |
1711 | return; | |
1712 | ||
c3d9714e | 1713 | mutex_lock(&mddev->bitmap_info.mutex); |
978a7a47 | 1714 | spin_lock(&mddev->lock); |
3178b0db | 1715 | mddev->bitmap = NULL; /* disconnect from the md device */ |
978a7a47 | 1716 | spin_unlock(&mddev->lock); |
c3d9714e | 1717 | mutex_unlock(&mddev->bitmap_info.mutex); |
b15c2e57 N |
1718 | if (mddev->thread) |
1719 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db | 1720 | |
ece5cff0 N |
1721 | if (bitmap->sysfs_can_clear) |
1722 | sysfs_put(bitmap->sysfs_can_clear); | |
1723 | ||
3178b0db N |
1724 | bitmap_free(bitmap); |
1725 | } | |
32a7627c N |
1726 | |
1727 | /* | |
1728 | * initialize the bitmap structure | |
1729 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1730 | */ | |
f9209a32 | 1731 | struct bitmap *bitmap_create(struct mddev *mddev, int slot) |
32a7627c N |
1732 | { |
1733 | struct bitmap *bitmap; | |
1f593903 | 1734 | sector_t blocks = mddev->resync_max_sectors; |
c3d9714e | 1735 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1736 | int err; |
324a56e1 | 1737 | struct kernfs_node *bm = NULL; |
32a7627c | 1738 | |
5f6e3c83 | 1739 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1740 | |
c3d9714e | 1741 | BUG_ON(file && mddev->bitmap_info.offset); |
a654b9d8 | 1742 | |
9ffae0cf | 1743 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c | 1744 | if (!bitmap) |
f9209a32 | 1745 | return ERR_PTR(-ENOMEM); |
32a7627c | 1746 | |
40cffcc0 | 1747 | spin_lock_init(&bitmap->counts.lock); |
ce25c31b N |
1748 | atomic_set(&bitmap->pending_writes, 0); |
1749 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1750 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1751 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1752 | |
32a7627c | 1753 | bitmap->mddev = mddev; |
f9209a32 | 1754 | bitmap->cluster_slot = slot; |
32a7627c | 1755 | |
5ff5afff | 1756 | if (mddev->kobj.sd) |
388975cc | 1757 | bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap"); |
ece5cff0 | 1758 | if (bm) { |
388975cc | 1759 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear"); |
ece5cff0 N |
1760 | sysfs_put(bm); |
1761 | } else | |
1762 | bitmap->sysfs_can_clear = NULL; | |
1763 | ||
1ec885cd | 1764 | bitmap->storage.file = file; |
ce25c31b N |
1765 | if (file) { |
1766 | get_file(file); | |
ae8fa283 N |
1767 | /* As future accesses to this file will use bmap, |
1768 | * and bypass the page cache, we must sync the file | |
1769 | * first. | |
1770 | */ | |
8018ab05 | 1771 | vfs_fsync(file, 1); |
ce25c31b | 1772 | } |
42a04b50 | 1773 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
9c81075f JB |
1774 | if (!mddev->bitmap_info.external) { |
1775 | /* | |
1776 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is | |
1777 | * instructing us to create a new on-disk bitmap instance. | |
1778 | */ | |
1779 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) | |
1780 | err = bitmap_new_disk_sb(bitmap); | |
1781 | else | |
1782 | err = bitmap_read_sb(bitmap); | |
1783 | } else { | |
ece5cff0 N |
1784 | err = 0; |
1785 | if (mddev->bitmap_info.chunksize == 0 || | |
1786 | mddev->bitmap_info.daemon_sleep == 0) | |
1787 | /* chunksize and time_base need to be | |
1788 | * set first. */ | |
1789 | err = -EINVAL; | |
1790 | } | |
32a7627c | 1791 | if (err) |
3178b0db | 1792 | goto error; |
32a7627c | 1793 | |
624ce4f5 | 1794 | bitmap->daemon_lastrun = jiffies; |
d60b479d N |
1795 | err = bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1); |
1796 | if (err) | |
3178b0db | 1797 | goto error; |
32a7627c | 1798 | |
69e51b44 | 1799 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
d60b479d | 1800 | bitmap->counts.pages, bmname(bitmap)); |
69e51b44 | 1801 | |
f9209a32 GR |
1802 | err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0; |
1803 | if (err) | |
1804 | goto error; | |
69e51b44 | 1805 | |
f9209a32 | 1806 | return bitmap; |
69e51b44 N |
1807 | error: |
1808 | bitmap_free(bitmap); | |
f9209a32 | 1809 | return ERR_PTR(err); |
69e51b44 N |
1810 | } |
1811 | ||
fd01b88c | 1812 | int bitmap_load(struct mddev *mddev) |
69e51b44 N |
1813 | { |
1814 | int err = 0; | |
3520fa4d | 1815 | sector_t start = 0; |
69e51b44 N |
1816 | sector_t sector = 0; |
1817 | struct bitmap *bitmap = mddev->bitmap; | |
1818 | ||
1819 | if (!bitmap) | |
1820 | goto out; | |
1821 | ||
1822 | /* Clear out old bitmap info first: Either there is none, or we | |
1823 | * are resuming after someone else has possibly changed things, | |
1824 | * so we should forget old cached info. | |
1825 | * All chunks should be clean, but some might need_sync. | |
1826 | */ | |
1827 | while (sector < mddev->resync_max_sectors) { | |
57dab0bd | 1828 | sector_t blocks; |
69e51b44 N |
1829 | bitmap_start_sync(bitmap, sector, &blocks, 0); |
1830 | sector += blocks; | |
1831 | } | |
1832 | bitmap_close_sync(bitmap); | |
1833 | ||
3520fa4d JB |
1834 | if (mddev->degraded == 0 |
1835 | || bitmap->events_cleared == mddev->events) | |
1836 | /* no need to keep dirty bits to optimise a | |
1837 | * re-add of a missing device */ | |
1838 | start = mddev->recovery_cp; | |
1839 | ||
afbaa90b | 1840 | mutex_lock(&mddev->bitmap_info.mutex); |
3520fa4d | 1841 | err = bitmap_init_from_disk(bitmap, start); |
afbaa90b | 1842 | mutex_unlock(&mddev->bitmap_info.mutex); |
3520fa4d | 1843 | |
32a7627c | 1844 | if (err) |
69e51b44 | 1845 | goto out; |
b405fe91 | 1846 | clear_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
1847 | |
1848 | /* Kick recovery in case any bits were set */ | |
1849 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
3178b0db | 1850 | |
1b04be96 | 1851 | mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; |
9cd30fdc | 1852 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 1853 | |
4ad13663 N |
1854 | bitmap_update_sb(bitmap); |
1855 | ||
b405fe91 | 1856 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
69e51b44 N |
1857 | err = -EIO; |
1858 | out: | |
3178b0db | 1859 | return err; |
32a7627c | 1860 | } |
69e51b44 | 1861 | EXPORT_SYMBOL_GPL(bitmap_load); |
32a7627c | 1862 | |
11dd35da GR |
1863 | /* Loads the bitmap associated with slot and copies the resync information |
1864 | * to our bitmap | |
1865 | */ | |
1866 | int bitmap_copy_from_slot(struct mddev *mddev, int slot, | |
97f6cd39 | 1867 | sector_t *low, sector_t *high, bool clear_bits) |
11dd35da GR |
1868 | { |
1869 | int rv = 0, i, j; | |
1870 | sector_t block, lo = 0, hi = 0; | |
1871 | struct bitmap_counts *counts; | |
1872 | struct bitmap *bitmap = bitmap_create(mddev, slot); | |
1873 | ||
1874 | if (IS_ERR(bitmap)) | |
1875 | return PTR_ERR(bitmap); | |
1876 | ||
11dd35da GR |
1877 | rv = bitmap_init_from_disk(bitmap, 0); |
1878 | if (rv) | |
1879 | goto err; | |
1880 | ||
1881 | counts = &bitmap->counts; | |
1882 | for (j = 0; j < counts->chunks; j++) { | |
1883 | block = (sector_t)j << counts->chunkshift; | |
1884 | if (bitmap_file_test_bit(bitmap, block)) { | |
1885 | if (!lo) | |
1886 | lo = block; | |
1887 | hi = block; | |
1888 | bitmap_file_clear_bit(bitmap, block); | |
1889 | bitmap_set_memory_bits(mddev->bitmap, block, 1); | |
1890 | bitmap_file_set_bit(mddev->bitmap, block); | |
1891 | } | |
1892 | } | |
1893 | ||
97f6cd39 GR |
1894 | if (clear_bits) { |
1895 | bitmap_update_sb(bitmap); | |
1896 | /* Setting this for the ev_page should be enough. | |
1897 | * And we do not require both write_all and PAGE_DIRT either | |
1898 | */ | |
1899 | for (i = 0; i < bitmap->storage.file_pages; i++) | |
1900 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); | |
1901 | bitmap_write_all(bitmap); | |
1902 | bitmap_unplug(bitmap); | |
1903 | } | |
11dd35da GR |
1904 | *low = lo; |
1905 | *high = hi; | |
1906 | err: | |
1907 | bitmap_free(bitmap); | |
1908 | return rv; | |
1909 | } | |
1910 | EXPORT_SYMBOL_GPL(bitmap_copy_from_slot); | |
1911 | ||
1912 | ||
57148964 N |
1913 | void bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
1914 | { | |
1915 | unsigned long chunk_kb; | |
40cffcc0 | 1916 | struct bitmap_counts *counts; |
57148964 N |
1917 | |
1918 | if (!bitmap) | |
1919 | return; | |
1920 | ||
40cffcc0 N |
1921 | counts = &bitmap->counts; |
1922 | ||
57148964 N |
1923 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; |
1924 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
1925 | "%lu%s chunk", | |
40cffcc0 N |
1926 | counts->pages - counts->missing_pages, |
1927 | counts->pages, | |
1928 | (counts->pages - counts->missing_pages) | |
57148964 N |
1929 | << (PAGE_SHIFT - 10), |
1930 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, | |
1931 | chunk_kb ? "KB" : "B"); | |
1ec885cd | 1932 | if (bitmap->storage.file) { |
57148964 | 1933 | seq_printf(seq, ", file: "); |
2726d566 | 1934 | seq_file_path(seq, bitmap->storage.file, " \t\n"); |
57148964 N |
1935 | } |
1936 | ||
1937 | seq_printf(seq, "\n"); | |
57148964 N |
1938 | } |
1939 | ||
d60b479d N |
1940 | int bitmap_resize(struct bitmap *bitmap, sector_t blocks, |
1941 | int chunksize, int init) | |
1942 | { | |
1943 | /* If chunk_size is 0, choose an appropriate chunk size. | |
1944 | * Then possibly allocate new storage space. | |
1945 | * Then quiesce, copy bits, replace bitmap, and re-start | |
1946 | * | |
1947 | * This function is called both to set up the initial bitmap | |
1948 | * and to resize the bitmap while the array is active. | |
1949 | * If this happens as a result of the array being resized, | |
1950 | * chunksize will be zero, and we need to choose a suitable | |
1951 | * chunksize, otherwise we use what we are given. | |
1952 | */ | |
1953 | struct bitmap_storage store; | |
1954 | struct bitmap_counts old_counts; | |
1955 | unsigned long chunks; | |
1956 | sector_t block; | |
1957 | sector_t old_blocks, new_blocks; | |
1958 | int chunkshift; | |
1959 | int ret = 0; | |
1960 | long pages; | |
1961 | struct bitmap_page *new_bp; | |
1962 | ||
1963 | if (chunksize == 0) { | |
1964 | /* If there is enough space, leave the chunk size unchanged, | |
1965 | * else increase by factor of two until there is enough space. | |
1966 | */ | |
1967 | long bytes; | |
1968 | long space = bitmap->mddev->bitmap_info.space; | |
1969 | ||
1970 | if (space == 0) { | |
1971 | /* We don't know how much space there is, so limit | |
1972 | * to current size - in sectors. | |
1973 | */ | |
1974 | bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8); | |
1975 | if (!bitmap->mddev->bitmap_info.external) | |
1976 | bytes += sizeof(bitmap_super_t); | |
1977 | space = DIV_ROUND_UP(bytes, 512); | |
1978 | bitmap->mddev->bitmap_info.space = space; | |
1979 | } | |
1980 | chunkshift = bitmap->counts.chunkshift; | |
1981 | chunkshift--; | |
1982 | do { | |
1983 | /* 'chunkshift' is shift from block size to chunk size */ | |
1984 | chunkshift++; | |
1985 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
1986 | bytes = DIV_ROUND_UP(chunks, 8); | |
1987 | if (!bitmap->mddev->bitmap_info.external) | |
1988 | bytes += sizeof(bitmap_super_t); | |
1989 | } while (bytes > (space << 9)); | |
1990 | } else | |
1991 | chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT; | |
1992 | ||
1993 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
1994 | memset(&store, 0, sizeof(store)); | |
1995 | if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file) | |
1996 | ret = bitmap_storage_alloc(&store, chunks, | |
b97e9257 | 1997 | !bitmap->mddev->bitmap_info.external, |
da6fb7a9 N |
1998 | mddev_is_clustered(bitmap->mddev) |
1999 | ? bitmap->cluster_slot : 0); | |
d60b479d N |
2000 | if (ret) |
2001 | goto err; | |
2002 | ||
2003 | pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO); | |
2004 | ||
2005 | new_bp = kzalloc(pages * sizeof(*new_bp), GFP_KERNEL); | |
2006 | ret = -ENOMEM; | |
2007 | if (!new_bp) { | |
2008 | bitmap_file_unmap(&store); | |
2009 | goto err; | |
2010 | } | |
2011 | ||
2012 | if (!init) | |
2013 | bitmap->mddev->pers->quiesce(bitmap->mddev, 1); | |
2014 | ||
2015 | store.file = bitmap->storage.file; | |
2016 | bitmap->storage.file = NULL; | |
2017 | ||
2018 | if (store.sb_page && bitmap->storage.sb_page) | |
2019 | memcpy(page_address(store.sb_page), | |
2020 | page_address(bitmap->storage.sb_page), | |
2021 | sizeof(bitmap_super_t)); | |
2022 | bitmap_file_unmap(&bitmap->storage); | |
2023 | bitmap->storage = store; | |
2024 | ||
2025 | old_counts = bitmap->counts; | |
2026 | bitmap->counts.bp = new_bp; | |
2027 | bitmap->counts.pages = pages; | |
2028 | bitmap->counts.missing_pages = pages; | |
2029 | bitmap->counts.chunkshift = chunkshift; | |
2030 | bitmap->counts.chunks = chunks; | |
2031 | bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift + | |
2032 | BITMAP_BLOCK_SHIFT); | |
2033 | ||
2034 | blocks = min(old_counts.chunks << old_counts.chunkshift, | |
2035 | chunks << chunkshift); | |
2036 | ||
2037 | spin_lock_irq(&bitmap->counts.lock); | |
2038 | for (block = 0; block < blocks; ) { | |
2039 | bitmap_counter_t *bmc_old, *bmc_new; | |
2040 | int set; | |
2041 | ||
2042 | bmc_old = bitmap_get_counter(&old_counts, block, | |
2043 | &old_blocks, 0); | |
2044 | set = bmc_old && NEEDED(*bmc_old); | |
2045 | ||
2046 | if (set) { | |
2047 | bmc_new = bitmap_get_counter(&bitmap->counts, block, | |
2048 | &new_blocks, 1); | |
2049 | if (*bmc_new == 0) { | |
2050 | /* need to set on-disk bits too. */ | |
2051 | sector_t end = block + new_blocks; | |
2052 | sector_t start = block >> chunkshift; | |
2053 | start <<= chunkshift; | |
2054 | while (start < end) { | |
2055 | bitmap_file_set_bit(bitmap, block); | |
2056 | start += 1 << chunkshift; | |
2057 | } | |
2058 | *bmc_new = 2; | |
2059 | bitmap_count_page(&bitmap->counts, | |
2060 | block, 1); | |
2061 | bitmap_set_pending(&bitmap->counts, | |
2062 | block); | |
2063 | } | |
2064 | *bmc_new |= NEEDED_MASK; | |
2065 | if (new_blocks < old_blocks) | |
2066 | old_blocks = new_blocks; | |
2067 | } | |
2068 | block += old_blocks; | |
2069 | } | |
2070 | ||
2071 | if (!init) { | |
2072 | int i; | |
2073 | while (block < (chunks << chunkshift)) { | |
2074 | bitmap_counter_t *bmc; | |
2075 | bmc = bitmap_get_counter(&bitmap->counts, block, | |
2076 | &new_blocks, 1); | |
2077 | if (bmc) { | |
2078 | /* new space. It needs to be resynced, so | |
2079 | * we set NEEDED_MASK. | |
2080 | */ | |
2081 | if (*bmc == 0) { | |
2082 | *bmc = NEEDED_MASK | 2; | |
2083 | bitmap_count_page(&bitmap->counts, | |
2084 | block, 1); | |
2085 | bitmap_set_pending(&bitmap->counts, | |
2086 | block); | |
2087 | } | |
2088 | } | |
2089 | block += new_blocks; | |
2090 | } | |
2091 | for (i = 0; i < bitmap->storage.file_pages; i++) | |
2092 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); | |
2093 | } | |
2094 | spin_unlock_irq(&bitmap->counts.lock); | |
2095 | ||
2096 | if (!init) { | |
2097 | bitmap_unplug(bitmap); | |
2098 | bitmap->mddev->pers->quiesce(bitmap->mddev, 0); | |
2099 | } | |
2100 | ret = 0; | |
2101 | err: | |
2102 | return ret; | |
2103 | } | |
2104 | EXPORT_SYMBOL_GPL(bitmap_resize); | |
2105 | ||
43a70507 | 2106 | static ssize_t |
fd01b88c | 2107 | location_show(struct mddev *mddev, char *page) |
43a70507 N |
2108 | { |
2109 | ssize_t len; | |
ac2f40be | 2110 | if (mddev->bitmap_info.file) |
43a70507 | 2111 | len = sprintf(page, "file"); |
ac2f40be | 2112 | else if (mddev->bitmap_info.offset) |
43a70507 | 2113 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 2114 | else |
43a70507 N |
2115 | len = sprintf(page, "none"); |
2116 | len += sprintf(page+len, "\n"); | |
2117 | return len; | |
2118 | } | |
2119 | ||
2120 | static ssize_t | |
fd01b88c | 2121 | location_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2122 | { |
2123 | ||
2124 | if (mddev->pers) { | |
2125 | if (!mddev->pers->quiesce) | |
2126 | return -EBUSY; | |
2127 | if (mddev->recovery || mddev->sync_thread) | |
2128 | return -EBUSY; | |
2129 | } | |
2130 | ||
2131 | if (mddev->bitmap || mddev->bitmap_info.file || | |
2132 | mddev->bitmap_info.offset) { | |
2133 | /* bitmap already configured. Only option is to clear it */ | |
2134 | if (strncmp(buf, "none", 4) != 0) | |
2135 | return -EBUSY; | |
2136 | if (mddev->pers) { | |
2137 | mddev->pers->quiesce(mddev, 1); | |
2138 | bitmap_destroy(mddev); | |
2139 | mddev->pers->quiesce(mddev, 0); | |
2140 | } | |
2141 | mddev->bitmap_info.offset = 0; | |
2142 | if (mddev->bitmap_info.file) { | |
2143 | struct file *f = mddev->bitmap_info.file; | |
2144 | mddev->bitmap_info.file = NULL; | |
43a70507 N |
2145 | fput(f); |
2146 | } | |
2147 | } else { | |
2148 | /* No bitmap, OK to set a location */ | |
2149 | long long offset; | |
2150 | if (strncmp(buf, "none", 4) == 0) | |
2151 | /* nothing to be done */; | |
2152 | else if (strncmp(buf, "file:", 5) == 0) { | |
2153 | /* Not supported yet */ | |
2154 | return -EINVAL; | |
2155 | } else { | |
2156 | int rv; | |
2157 | if (buf[0] == '+') | |
b29bebd6 | 2158 | rv = kstrtoll(buf+1, 10, &offset); |
43a70507 | 2159 | else |
b29bebd6 | 2160 | rv = kstrtoll(buf, 10, &offset); |
43a70507 N |
2161 | if (rv) |
2162 | return rv; | |
2163 | if (offset == 0) | |
2164 | return -EINVAL; | |
ece5cff0 N |
2165 | if (mddev->bitmap_info.external == 0 && |
2166 | mddev->major_version == 0 && | |
43a70507 N |
2167 | offset != mddev->bitmap_info.default_offset) |
2168 | return -EINVAL; | |
2169 | mddev->bitmap_info.offset = offset; | |
2170 | if (mddev->pers) { | |
f9209a32 | 2171 | struct bitmap *bitmap; |
43a70507 | 2172 | mddev->pers->quiesce(mddev, 1); |
f9209a32 GR |
2173 | bitmap = bitmap_create(mddev, -1); |
2174 | if (IS_ERR(bitmap)) | |
2175 | rv = PTR_ERR(bitmap); | |
2176 | else { | |
2177 | mddev->bitmap = bitmap; | |
4474ca42 | 2178 | rv = bitmap_load(mddev); |
f9209a32 GR |
2179 | if (rv) { |
2180 | bitmap_destroy(mddev); | |
2181 | mddev->bitmap_info.offset = 0; | |
2182 | } | |
43a70507 N |
2183 | } |
2184 | mddev->pers->quiesce(mddev, 0); | |
2185 | if (rv) | |
2186 | return rv; | |
2187 | } | |
2188 | } | |
2189 | } | |
2190 | if (!mddev->external) { | |
2191 | /* Ensure new bitmap info is stored in | |
2192 | * metadata promptly. | |
2193 | */ | |
2194 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2195 | md_wakeup_thread(mddev->thread); | |
2196 | } | |
2197 | return len; | |
2198 | } | |
2199 | ||
2200 | static struct md_sysfs_entry bitmap_location = | |
2201 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
2202 | ||
6409bb05 N |
2203 | /* 'bitmap/space' is the space available at 'location' for the |
2204 | * bitmap. This allows the kernel to know when it is safe to | |
2205 | * resize the bitmap to match a resized array. | |
2206 | */ | |
2207 | static ssize_t | |
2208 | space_show(struct mddev *mddev, char *page) | |
2209 | { | |
2210 | return sprintf(page, "%lu\n", mddev->bitmap_info.space); | |
2211 | } | |
2212 | ||
2213 | static ssize_t | |
2214 | space_store(struct mddev *mddev, const char *buf, size_t len) | |
2215 | { | |
2216 | unsigned long sectors; | |
2217 | int rv; | |
2218 | ||
2219 | rv = kstrtoul(buf, 10, §ors); | |
2220 | if (rv) | |
2221 | return rv; | |
2222 | ||
2223 | if (sectors == 0) | |
2224 | return -EINVAL; | |
2225 | ||
2226 | if (mddev->bitmap && | |
9b1215c1 | 2227 | sectors < (mddev->bitmap->storage.bytes + 511) >> 9) |
6409bb05 N |
2228 | return -EFBIG; /* Bitmap is too big for this small space */ |
2229 | ||
2230 | /* could make sure it isn't too big, but that isn't really | |
2231 | * needed - user-space should be careful. | |
2232 | */ | |
2233 | mddev->bitmap_info.space = sectors; | |
2234 | return len; | |
2235 | } | |
2236 | ||
2237 | static struct md_sysfs_entry bitmap_space = | |
2238 | __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); | |
2239 | ||
43a70507 | 2240 | static ssize_t |
fd01b88c | 2241 | timeout_show(struct mddev *mddev, char *page) |
43a70507 N |
2242 | { |
2243 | ssize_t len; | |
2244 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
2245 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 2246 | |
43a70507 N |
2247 | len = sprintf(page, "%lu", secs); |
2248 | if (jifs) | |
2249 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
2250 | len += sprintf(page+len, "\n"); | |
2251 | return len; | |
2252 | } | |
2253 | ||
2254 | static ssize_t | |
fd01b88c | 2255 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2256 | { |
2257 | /* timeout can be set at any time */ | |
2258 | unsigned long timeout; | |
2259 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
2260 | if (rv) | |
2261 | return rv; | |
2262 | ||
2263 | /* just to make sure we don't overflow... */ | |
2264 | if (timeout >= LONG_MAX / HZ) | |
2265 | return -EINVAL; | |
2266 | ||
2267 | timeout = timeout * HZ / 10000; | |
2268 | ||
2269 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
2270 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
2271 | if (timeout < 1) | |
2272 | timeout = 1; | |
2273 | mddev->bitmap_info.daemon_sleep = timeout; | |
2274 | if (mddev->thread) { | |
2275 | /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then | |
2276 | * the bitmap is all clean and we don't need to | |
2277 | * adjust the timeout right now | |
2278 | */ | |
2279 | if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { | |
2280 | mddev->thread->timeout = timeout; | |
2281 | md_wakeup_thread(mddev->thread); | |
2282 | } | |
2283 | } | |
2284 | return len; | |
2285 | } | |
2286 | ||
2287 | static struct md_sysfs_entry bitmap_timeout = | |
2288 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
2289 | ||
2290 | static ssize_t | |
fd01b88c | 2291 | backlog_show(struct mddev *mddev, char *page) |
43a70507 N |
2292 | { |
2293 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
2294 | } | |
2295 | ||
2296 | static ssize_t | |
fd01b88c | 2297 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2298 | { |
2299 | unsigned long backlog; | |
b29bebd6 | 2300 | int rv = kstrtoul(buf, 10, &backlog); |
43a70507 N |
2301 | if (rv) |
2302 | return rv; | |
2303 | if (backlog > COUNTER_MAX) | |
2304 | return -EINVAL; | |
2305 | mddev->bitmap_info.max_write_behind = backlog; | |
2306 | return len; | |
2307 | } | |
2308 | ||
2309 | static struct md_sysfs_entry bitmap_backlog = | |
2310 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
2311 | ||
2312 | static ssize_t | |
fd01b88c | 2313 | chunksize_show(struct mddev *mddev, char *page) |
43a70507 N |
2314 | { |
2315 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
2316 | } | |
2317 | ||
2318 | static ssize_t | |
fd01b88c | 2319 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2320 | { |
2321 | /* Can only be changed when no bitmap is active */ | |
2322 | int rv; | |
2323 | unsigned long csize; | |
2324 | if (mddev->bitmap) | |
2325 | return -EBUSY; | |
b29bebd6 | 2326 | rv = kstrtoul(buf, 10, &csize); |
43a70507 N |
2327 | if (rv) |
2328 | return rv; | |
2329 | if (csize < 512 || | |
2330 | !is_power_of_2(csize)) | |
2331 | return -EINVAL; | |
2332 | mddev->bitmap_info.chunksize = csize; | |
2333 | return len; | |
2334 | } | |
2335 | ||
2336 | static struct md_sysfs_entry bitmap_chunksize = | |
2337 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
2338 | ||
fd01b88c | 2339 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
ece5cff0 | 2340 | { |
c4ce867f GR |
2341 | if (mddev_is_clustered(mddev)) |
2342 | return sprintf(page, "clustered\n"); | |
ece5cff0 N |
2343 | return sprintf(page, "%s\n", (mddev->bitmap_info.external |
2344 | ? "external" : "internal")); | |
2345 | } | |
2346 | ||
fd01b88c | 2347 | static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2348 | { |
2349 | if (mddev->bitmap || | |
2350 | mddev->bitmap_info.file || | |
2351 | mddev->bitmap_info.offset) | |
2352 | return -EBUSY; | |
2353 | if (strncmp(buf, "external", 8) == 0) | |
2354 | mddev->bitmap_info.external = 1; | |
c4ce867f GR |
2355 | else if ((strncmp(buf, "internal", 8) == 0) || |
2356 | (strncmp(buf, "clustered", 9) == 0)) | |
ece5cff0 N |
2357 | mddev->bitmap_info.external = 0; |
2358 | else | |
2359 | return -EINVAL; | |
2360 | return len; | |
2361 | } | |
2362 | ||
2363 | static struct md_sysfs_entry bitmap_metadata = | |
2364 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
2365 | ||
fd01b88c | 2366 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
ece5cff0 N |
2367 | { |
2368 | int len; | |
b7b17c9b | 2369 | spin_lock(&mddev->lock); |
ece5cff0 N |
2370 | if (mddev->bitmap) |
2371 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
2372 | "false" : "true")); | |
2373 | else | |
2374 | len = sprintf(page, "\n"); | |
b7b17c9b | 2375 | spin_unlock(&mddev->lock); |
ece5cff0 N |
2376 | return len; |
2377 | } | |
2378 | ||
fd01b88c | 2379 | static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2380 | { |
2381 | if (mddev->bitmap == NULL) | |
2382 | return -ENOENT; | |
2383 | if (strncmp(buf, "false", 5) == 0) | |
2384 | mddev->bitmap->need_sync = 1; | |
2385 | else if (strncmp(buf, "true", 4) == 0) { | |
2386 | if (mddev->degraded) | |
2387 | return -EBUSY; | |
2388 | mddev->bitmap->need_sync = 0; | |
2389 | } else | |
2390 | return -EINVAL; | |
2391 | return len; | |
2392 | } | |
2393 | ||
2394 | static struct md_sysfs_entry bitmap_can_clear = | |
2395 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
2396 | ||
696fcd53 | 2397 | static ssize_t |
fd01b88c | 2398 | behind_writes_used_show(struct mddev *mddev, char *page) |
696fcd53 | 2399 | { |
b7b17c9b N |
2400 | ssize_t ret; |
2401 | spin_lock(&mddev->lock); | |
696fcd53 | 2402 | if (mddev->bitmap == NULL) |
b7b17c9b N |
2403 | ret = sprintf(page, "0\n"); |
2404 | else | |
2405 | ret = sprintf(page, "%lu\n", | |
2406 | mddev->bitmap->behind_writes_used); | |
2407 | spin_unlock(&mddev->lock); | |
2408 | return ret; | |
696fcd53 PC |
2409 | } |
2410 | ||
2411 | static ssize_t | |
fd01b88c | 2412 | behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) |
696fcd53 PC |
2413 | { |
2414 | if (mddev->bitmap) | |
2415 | mddev->bitmap->behind_writes_used = 0; | |
2416 | return len; | |
2417 | } | |
2418 | ||
2419 | static struct md_sysfs_entry max_backlog_used = | |
2420 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2421 | behind_writes_used_show, behind_writes_used_reset); | |
2422 | ||
43a70507 N |
2423 | static struct attribute *md_bitmap_attrs[] = { |
2424 | &bitmap_location.attr, | |
6409bb05 | 2425 | &bitmap_space.attr, |
43a70507 N |
2426 | &bitmap_timeout.attr, |
2427 | &bitmap_backlog.attr, | |
2428 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2429 | &bitmap_metadata.attr, |
2430 | &bitmap_can_clear.attr, | |
696fcd53 | 2431 | &max_backlog_used.attr, |
43a70507 N |
2432 | NULL |
2433 | }; | |
2434 | struct attribute_group md_bitmap_group = { | |
2435 | .name = "bitmap", | |
2436 | .attrs = md_bitmap_attrs, | |
2437 | }; | |
2438 |