Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
32a7627c N |
2 | /* |
3 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 | |
4 | * | |
5 | * bitmap_create - sets up the bitmap structure | |
6 | * bitmap_destroy - destroys the bitmap structure | |
7 | * | |
8 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: | |
9 | * - added disk storage for bitmap | |
10 | * - changes to allow various bitmap chunk sizes | |
32a7627c N |
11 | */ |
12 | ||
13 | /* | |
14 | * Still to do: | |
15 | * | |
16 | * flush after percent set rather than just time based. (maybe both). | |
32a7627c N |
17 | */ |
18 | ||
bff61975 | 19 | #include <linux/blkdev.h> |
32a7627c | 20 | #include <linux/module.h> |
32a7627c N |
21 | #include <linux/errno.h> |
22 | #include <linux/slab.h> | |
23 | #include <linux/init.h> | |
32a7627c N |
24 | #include <linux/timer.h> |
25 | #include <linux/sched.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/file.h> | |
28 | #include <linux/mount.h> | |
29 | #include <linux/buffer_head.h> | |
57148964 | 30 | #include <linux/seq_file.h> |
581dbd94 | 31 | #include <trace/events/block.h> |
43b2e5d8 | 32 | #include "md.h" |
935fe098 | 33 | #include "md-bitmap.h" |
32a7627c | 34 | |
ac2f40be | 35 | static inline char *bmname(struct bitmap *bitmap) |
32a7627c N |
36 | { |
37 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; | |
38 | } | |
39 | ||
32a7627c N |
40 | /* |
41 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) | |
42 | * | |
43 | * 1) check to see if this page is allocated, if it's not then try to alloc | |
44 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the | |
45 | * page pointer directly as a counter | |
46 | * | |
47 | * if we find our page, we increment the page's refcount so that it stays | |
48 | * allocated while we're using it | |
49 | */ | |
e64e4018 AS |
50 | static int md_bitmap_checkpage(struct bitmap_counts *bitmap, |
51 | unsigned long page, int create, int no_hijack) | |
ee305ace N |
52 | __releases(bitmap->lock) |
53 | __acquires(bitmap->lock) | |
32a7627c N |
54 | { |
55 | unsigned char *mappage; | |
56 | ||
301867b1 | 57 | WARN_ON_ONCE(page >= bitmap->pages); |
32a7627c N |
58 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
59 | return 0; | |
60 | ||
61 | if (bitmap->bp[page].map) /* page is already allocated, just return */ | |
62 | return 0; | |
63 | ||
64 | if (!create) | |
65 | return -ENOENT; | |
66 | ||
32a7627c N |
67 | /* this page has not been allocated yet */ |
68 | ||
ac2f40be | 69 | spin_unlock_irq(&bitmap->lock); |
d9590143 N |
70 | /* It is possible that this is being called inside a |
71 | * prepare_to_wait/finish_wait loop from raid5c:make_request(). | |
72 | * In general it is not permitted to sleep in that context as it | |
73 | * can cause the loop to spin freely. | |
74 | * That doesn't apply here as we can only reach this point | |
75 | * once with any loop. | |
76 | * When this function completes, either bp[page].map or | |
77 | * bp[page].hijacked. In either case, this function will | |
78 | * abort before getting to this point again. So there is | |
79 | * no risk of a free-spin, and so it is safe to assert | |
80 | * that sleeping here is allowed. | |
81 | */ | |
82 | sched_annotate_sleep(); | |
792a1d4b | 83 | mappage = kzalloc(PAGE_SIZE, GFP_NOIO); |
ac2f40be N |
84 | spin_lock_irq(&bitmap->lock); |
85 | ||
86 | if (mappage == NULL) { | |
40cffcc0 | 87 | pr_debug("md/bitmap: map page allocation failed, hijacking\n"); |
c9d65032 GJ |
88 | /* We don't support hijack for cluster raid */ |
89 | if (no_hijack) | |
90 | return -ENOMEM; | |
32a7627c N |
91 | /* failed - set the hijacked flag so that we can use the |
92 | * pointer as a counter */ | |
32a7627c N |
93 | if (!bitmap->bp[page].map) |
94 | bitmap->bp[page].hijacked = 1; | |
ac2f40be N |
95 | } else if (bitmap->bp[page].map || |
96 | bitmap->bp[page].hijacked) { | |
32a7627c | 97 | /* somebody beat us to getting the page */ |
792a1d4b | 98 | kfree(mappage); |
ac2f40be | 99 | } else { |
32a7627c | 100 | |
ac2f40be | 101 | /* no page was in place and we have one, so install it */ |
32a7627c | 102 | |
ac2f40be N |
103 | bitmap->bp[page].map = mappage; |
104 | bitmap->missing_pages--; | |
105 | } | |
32a7627c N |
106 | return 0; |
107 | } | |
108 | ||
32a7627c N |
109 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
110 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
111 | /* Note: lock should be held when calling this */ | |
e64e4018 | 112 | static void md_bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page) |
32a7627c N |
113 | { |
114 | char *ptr; | |
115 | ||
116 | if (bitmap->bp[page].count) /* page is still busy */ | |
117 | return; | |
118 | ||
119 | /* page is no longer in use, it can be released */ | |
120 | ||
121 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
122 | bitmap->bp[page].hijacked = 0; | |
123 | bitmap->bp[page].map = NULL; | |
ac2f40be N |
124 | } else { |
125 | /* normal case, free the page */ | |
126 | ptr = bitmap->bp[page].map; | |
127 | bitmap->bp[page].map = NULL; | |
128 | bitmap->missing_pages++; | |
792a1d4b | 129 | kfree(ptr); |
32a7627c | 130 | } |
32a7627c N |
131 | } |
132 | ||
32a7627c N |
133 | /* |
134 | * bitmap file handling - read and write the bitmap file and its superblock | |
135 | */ | |
136 | ||
32a7627c N |
137 | /* |
138 | * basic page I/O operations | |
139 | */ | |
140 | ||
a654b9d8 | 141 | /* IO operations when bitmap is stored near all superblocks */ |
0c3ea5cc CH |
142 | |
143 | /* choose a good rdev and read the page from there */ | |
27581e5a | 144 | static int read_sb_page(struct mddev *mddev, loff_t offset, |
0c3ea5cc | 145 | struct page *page, unsigned long index, int size) |
a654b9d8 | 146 | { |
a654b9d8 | 147 | |
f5f2d5ac CH |
148 | sector_t sector = mddev->bitmap_info.offset + offset + |
149 | index * (PAGE_SIZE / SECTOR_SIZE); | |
3cb03002 | 150 | struct md_rdev *rdev; |
a654b9d8 | 151 | |
dafb20fa | 152 | rdev_for_each(rdev, mddev) { |
0c3ea5cc | 153 | u32 iosize = roundup(size, bdev_logical_block_size(rdev->bdev)); |
ab904d63 | 154 | |
0c3ea5cc CH |
155 | if (!test_bit(In_sync, &rdev->flags) || |
156 | test_bit(Faulty, &rdev->flags) || | |
157 | test_bit(Bitmap_sync, &rdev->flags)) | |
158 | continue; | |
a654b9d8 | 159 | |
d7038f95 | 160 | if (sync_page_io(rdev, sector, iosize, page, REQ_OP_READ, true)) |
27581e5a | 161 | return 0; |
ab904d63 | 162 | } |
27581e5a | 163 | return -EIO; |
a654b9d8 N |
164 | } |
165 | ||
fd01b88c | 166 | static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) |
b2d2c4ce N |
167 | { |
168 | /* Iterate the disks of an mddev, using rcu to protect access to the | |
169 | * linked list, and raising the refcount of devices we return to ensure | |
170 | * they don't disappear while in use. | |
171 | * As devices are only added or removed when raid_disk is < 0 and | |
172 | * nr_pending is 0 and In_sync is clear, the entries we return will | |
173 | * still be in the same position on the list when we re-enter | |
fd177481 | 174 | * list_for_each_entry_continue_rcu. |
8532e343 N |
175 | * |
176 | * Note that if entered with 'rdev == NULL' to start at the | |
177 | * beginning, we temporarily assign 'rdev' to an address which | |
178 | * isn't really an rdev, but which can be used by | |
179 | * list_for_each_entry_continue_rcu() to find the first entry. | |
b2d2c4ce | 180 | */ |
b2d2c4ce N |
181 | rcu_read_lock(); |
182 | if (rdev == NULL) | |
183 | /* start at the beginning */ | |
8532e343 | 184 | rdev = list_entry(&mddev->disks, struct md_rdev, same_set); |
b2d2c4ce N |
185 | else { |
186 | /* release the previous rdev and start from there. */ | |
187 | rdev_dec_pending(rdev, mddev); | |
b2d2c4ce | 188 | } |
fd177481 | 189 | list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) { |
b2d2c4ce | 190 | if (rdev->raid_disk >= 0 && |
b2d2c4ce N |
191 | !test_bit(Faulty, &rdev->flags)) { |
192 | /* this is a usable devices */ | |
193 | atomic_inc(&rdev->nr_pending); | |
194 | rcu_read_unlock(); | |
195 | return rdev; | |
196 | } | |
197 | } | |
198 | rcu_read_unlock(); | |
199 | return NULL; | |
200 | } | |
201 | ||
8745faa9 JD |
202 | static unsigned int optimal_io_size(struct block_device *bdev, |
203 | unsigned int last_page_size, | |
204 | unsigned int io_size) | |
205 | { | |
206 | if (bdev_io_opt(bdev) > bdev_logical_block_size(bdev)) | |
207 | return roundup(last_page_size, bdev_io_opt(bdev)); | |
208 | return io_size; | |
209 | } | |
210 | ||
211 | static unsigned int bitmap_io_size(unsigned int io_size, unsigned int opt_size, | |
b1211978 | 212 | loff_t start, loff_t boundary) |
8745faa9 JD |
213 | { |
214 | if (io_size != opt_size && | |
215 | start + opt_size / SECTOR_SIZE <= boundary) | |
216 | return opt_size; | |
217 | if (start + io_size / SECTOR_SIZE <= boundary) | |
218 | return io_size; | |
219 | ||
220 | /* Overflows boundary */ | |
221 | return 0; | |
222 | } | |
223 | ||
328e17d8 | 224 | static int __write_sb_page(struct md_rdev *rdev, struct bitmap *bitmap, |
d7038f95 | 225 | unsigned long pg_index, struct page *page) |
a654b9d8 | 226 | { |
a6ff7e08 | 227 | struct block_device *bdev; |
fd01b88c | 228 | struct mddev *mddev = bitmap->mddev; |
1ec885cd | 229 | struct bitmap_storage *store = &bitmap->storage; |
b1211978 | 230 | loff_t sboff, offset = mddev->bitmap_info.offset; |
d7038f95 | 231 | sector_t ps = pg_index * PAGE_SIZE / SECTOR_SIZE; |
10172f20 | 232 | unsigned int size = PAGE_SIZE; |
8745faa9 | 233 | unsigned int opt_size = PAGE_SIZE; |
d7038f95 | 234 | sector_t doff; |
a654b9d8 | 235 | |
328e17d8 | 236 | bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; |
ecbd8ebb HZ |
237 | /* we compare length (page numbers), not page offset. */ |
238 | if ((pg_index - store->sb_index) == store->file_pages - 1) { | |
10172f20 | 239 | unsigned int last_page_size = store->bytes & (PAGE_SIZE - 1); |
a6ff7e08 | 240 | |
328e17d8 JD |
241 | if (last_page_size == 0) |
242 | last_page_size = PAGE_SIZE; | |
8745faa9 JD |
243 | size = roundup(last_page_size, bdev_logical_block_size(bdev)); |
244 | opt_size = optimal_io_size(bdev, last_page_size, size); | |
328e17d8 | 245 | } |
a6ff7e08 | 246 | |
10172f20 JD |
247 | sboff = rdev->sb_start + offset; |
248 | doff = rdev->data_offset; | |
249 | ||
328e17d8 JD |
250 | /* Just make sure we aren't corrupting data or metadata */ |
251 | if (mddev->external) { | |
252 | /* Bitmap could be anywhere. */ | |
10172f20 JD |
253 | if (sboff + ps > doff && |
254 | sboff < (doff + mddev->dev_sectors + PAGE_SIZE / SECTOR_SIZE)) | |
328e17d8 JD |
255 | return -EINVAL; |
256 | } else if (offset < 0) { | |
257 | /* DATA BITMAP METADATA */ | |
8745faa9 JD |
258 | size = bitmap_io_size(size, opt_size, offset + ps, 0); |
259 | if (size == 0) | |
328e17d8 JD |
260 | /* bitmap runs in to metadata */ |
261 | return -EINVAL; | |
262 | ||
10172f20 | 263 | if (doff + mddev->dev_sectors > sboff) |
328e17d8 JD |
264 | /* data runs in to bitmap */ |
265 | return -EINVAL; | |
266 | } else if (rdev->sb_start < rdev->data_offset) { | |
267 | /* METADATA BITMAP DATA */ | |
8745faa9 JD |
268 | size = bitmap_io_size(size, opt_size, sboff + ps, doff); |
269 | if (size == 0) | |
328e17d8 JD |
270 | /* bitmap runs in to data */ |
271 | return -EINVAL; | |
272 | } else { | |
273 | /* DATA METADATA BITMAP - no problems */ | |
b2d2c4ce | 274 | } |
a654b9d8 | 275 | |
10172f20 | 276 | md_super_write(mddev, rdev, sboff + ps, (int) size, page); |
a654b9d8 | 277 | return 0; |
328e17d8 | 278 | } |
4b80991c | 279 | |
d7038f95 CH |
280 | static void write_sb_page(struct bitmap *bitmap, unsigned long pg_index, |
281 | struct page *page, bool wait) | |
328e17d8 | 282 | { |
328e17d8 | 283 | struct mddev *mddev = bitmap->mddev; |
328e17d8 JD |
284 | |
285 | do { | |
59cefee7 CH |
286 | struct md_rdev *rdev = NULL; |
287 | ||
328e17d8 | 288 | while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { |
d7038f95 | 289 | if (__write_sb_page(rdev, bitmap, pg_index, page) < 0) { |
59cefee7 CH |
290 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); |
291 | return; | |
292 | } | |
328e17d8 JD |
293 | } |
294 | } while (wait && md_super_wait(mddev) < 0); | |
a654b9d8 N |
295 | } |
296 | ||
e64e4018 | 297 | static void md_bitmap_file_kick(struct bitmap *bitmap); |
32a7627c | 298 | |
a34d4ef8 | 299 | #ifdef CONFIG_MD_BITMAP_FILE |
5339178e CH |
300 | static void write_file_page(struct bitmap *bitmap, struct page *page, int wait) |
301 | { | |
302 | struct buffer_head *bh = page_buffers(page); | |
d785a06a | 303 | |
5339178e CH |
304 | while (bh && bh->b_blocknr) { |
305 | atomic_inc(&bitmap->pending_writes); | |
306 | set_buffer_locked(bh); | |
307 | set_buffer_mapped(bh); | |
308 | submit_bh(REQ_OP_WRITE | REQ_SYNC, bh); | |
309 | bh = bh->b_this_page; | |
8a5e9cf1 | 310 | } |
5339178e CH |
311 | |
312 | if (wait) | |
313 | wait_event(bitmap->write_wait, | |
314 | atomic_read(&bitmap->pending_writes) == 0); | |
d785a06a N |
315 | } |
316 | ||
317 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
318 | { | |
319 | struct bitmap *bitmap = bh->b_private; | |
32a7627c | 320 | |
b405fe91 N |
321 | if (!uptodate) |
322 | set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); | |
d785a06a N |
323 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
324 | wake_up(&bitmap->write_wait); | |
325 | } | |
32a7627c | 326 | |
d785a06a N |
327 | static void free_buffers(struct page *page) |
328 | { | |
27581e5a | 329 | struct buffer_head *bh; |
77ad4bc7 | 330 | |
27581e5a N |
331 | if (!PagePrivate(page)) |
332 | return; | |
333 | ||
334 | bh = page_buffers(page); | |
d785a06a N |
335 | while (bh) { |
336 | struct buffer_head *next = bh->b_this_page; | |
337 | free_buffer_head(bh); | |
338 | bh = next; | |
77ad4bc7 | 339 | } |
db2c1d86 | 340 | detach_page_private(page); |
d785a06a | 341 | put_page(page); |
32a7627c N |
342 | } |
343 | ||
d785a06a N |
344 | /* read a page from a file. |
345 | * We both read the page, and attach buffers to the page to record the | |
346 | * address of each block (using bmap). These addresses will be used | |
347 | * to write the block later, completely bypassing the filesystem. | |
348 | * This usage is similar to how swap files are handled, and allows us | |
349 | * to write to a file with no concerns of memory allocation failing. | |
350 | */ | |
d681054c CH |
351 | static int read_file_page(struct file *file, unsigned long index, |
352 | struct bitmap *bitmap, unsigned long count, struct page *page) | |
32a7627c | 353 | { |
27581e5a | 354 | int ret = 0; |
496ad9aa | 355 | struct inode *inode = file_inode(file); |
d785a06a | 356 | struct buffer_head *bh; |
30460e1e | 357 | sector_t block, blk_cur; |
313b825f | 358 | unsigned long blocksize = i_blocksize(inode); |
32a7627c | 359 | |
36a4e1fe N |
360 | pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, |
361 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 362 | |
313b825f | 363 | bh = alloc_page_buffers(page, blocksize, false); |
d785a06a | 364 | if (!bh) { |
27581e5a | 365 | ret = -ENOMEM; |
32a7627c N |
366 | goto out; |
367 | } | |
db2c1d86 | 368 | attach_page_private(page, bh); |
30460e1e | 369 | blk_cur = index << (PAGE_SHIFT - inode->i_blkbits); |
d785a06a | 370 | while (bh) { |
30460e1e CM |
371 | block = blk_cur; |
372 | ||
d785a06a N |
373 | if (count == 0) |
374 | bh->b_blocknr = 0; | |
375 | else { | |
30460e1e CM |
376 | ret = bmap(inode, &block); |
377 | if (ret || !block) { | |
27581e5a | 378 | ret = -EINVAL; |
30460e1e | 379 | bh->b_blocknr = 0; |
d785a06a N |
380 | goto out; |
381 | } | |
30460e1e CM |
382 | |
383 | bh->b_blocknr = block; | |
d785a06a | 384 | bh->b_bdev = inode->i_sb->s_bdev; |
313b825f | 385 | if (count < blocksize) |
d785a06a N |
386 | count = 0; |
387 | else | |
313b825f | 388 | count -= blocksize; |
d785a06a N |
389 | |
390 | bh->b_end_io = end_bitmap_write; | |
391 | bh->b_private = bitmap; | |
ce25c31b N |
392 | atomic_inc(&bitmap->pending_writes); |
393 | set_buffer_locked(bh); | |
394 | set_buffer_mapped(bh); | |
1420c4a5 | 395 | submit_bh(REQ_OP_READ, bh); |
d785a06a | 396 | } |
30460e1e | 397 | blk_cur++; |
d785a06a N |
398 | bh = bh->b_this_page; |
399 | } | |
ce25c31b N |
400 | |
401 | wait_event(bitmap->write_wait, | |
402 | atomic_read(&bitmap->pending_writes)==0); | |
b405fe91 | 403 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
27581e5a | 404 | ret = -EIO; |
32a7627c | 405 | out: |
27581e5a | 406 | if (ret) |
ec0cc226 N |
407 | pr_err("md: bitmap read error: (%dB @ %llu): %d\n", |
408 | (int)PAGE_SIZE, | |
409 | (unsigned long long)index << PAGE_SHIFT, | |
410 | ret); | |
27581e5a | 411 | return ret; |
32a7627c | 412 | } |
a34d4ef8 CH |
413 | #else /* CONFIG_MD_BITMAP_FILE */ |
414 | static void write_file_page(struct bitmap *bitmap, struct page *page, int wait) | |
415 | { | |
416 | } | |
417 | static int read_file_page(struct file *file, unsigned long index, | |
418 | struct bitmap *bitmap, unsigned long count, struct page *page) | |
419 | { | |
420 | return -EIO; | |
421 | } | |
422 | static void free_buffers(struct page *page) | |
423 | { | |
424 | put_page(page); | |
425 | } | |
426 | #endif /* CONFIG_MD_BITMAP_FILE */ | |
32a7627c N |
427 | |
428 | /* | |
429 | * bitmap file superblock operations | |
430 | */ | |
431 | ||
5339178e CH |
432 | /* |
433 | * write out a page to a file | |
434 | */ | |
d7038f95 CH |
435 | static void filemap_write_page(struct bitmap *bitmap, unsigned long pg_index, |
436 | bool wait) | |
5339178e | 437 | { |
d7038f95 CH |
438 | struct bitmap_storage *store = &bitmap->storage; |
439 | struct page *page = store->filemap[pg_index]; | |
440 | ||
441 | if (mddev_is_clustered(bitmap->mddev)) { | |
ecbd8ebb HZ |
442 | /* go to node bitmap area starting point */ |
443 | pg_index += store->sb_index; | |
d7038f95 CH |
444 | } |
445 | ||
446 | if (store->file) | |
5339178e CH |
447 | write_file_page(bitmap, page, wait); |
448 | else | |
d7038f95 | 449 | write_sb_page(bitmap, pg_index, page, wait); |
5339178e CH |
450 | } |
451 | ||
85c9ccd4 | 452 | /* |
e64e4018 | 453 | * md_bitmap_wait_writes() should be called before writing any bitmap |
85c9ccd4 | 454 | * blocks, to ensure previous writes, particularly from |
e64e4018 | 455 | * md_bitmap_daemon_work(), have completed. |
85c9ccd4 | 456 | */ |
e64e4018 | 457 | static void md_bitmap_wait_writes(struct bitmap *bitmap) |
85c9ccd4 N |
458 | { |
459 | if (bitmap->storage.file) | |
460 | wait_event(bitmap->write_wait, | |
461 | atomic_read(&bitmap->pending_writes)==0); | |
462 | else | |
46533ff7 N |
463 | /* Note that we ignore the return value. The writes |
464 | * might have failed, but that would just mean that | |
465 | * some bits which should be cleared haven't been, | |
466 | * which is safe. The relevant bitmap blocks will | |
467 | * probably get written again, but there is no great | |
468 | * loss if they aren't. | |
469 | */ | |
85c9ccd4 N |
470 | md_super_wait(bitmap->mddev); |
471 | } | |
472 | ||
473 | ||
32a7627c | 474 | /* update the event counter and sync the superblock to disk */ |
e64e4018 | 475 | void md_bitmap_update_sb(struct bitmap *bitmap) |
32a7627c N |
476 | { |
477 | bitmap_super_t *sb; | |
32a7627c N |
478 | |
479 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
4ad13663 | 480 | return; |
ece5cff0 N |
481 | if (bitmap->mddev->bitmap_info.external) |
482 | return; | |
1ec885cd | 483 | if (!bitmap->storage.sb_page) /* no superblock */ |
4ad13663 | 484 | return; |
1ec885cd | 485 | sb = kmap_atomic(bitmap->storage.sb_page); |
32a7627c | 486 | sb->events = cpu_to_le64(bitmap->mddev->events); |
8258c532 | 487 | if (bitmap->mddev->events < bitmap->events_cleared) |
a0da84f3 NB |
488 | /* rocking back to read-only */ |
489 | bitmap->events_cleared = bitmap->mddev->events; | |
8258c532 | 490 | sb->events_cleared = cpu_to_le64(bitmap->events_cleared); |
97f0eb9f HT |
491 | /* |
492 | * clear BITMAP_WRITE_ERROR bit to protect against the case that | |
493 | * a bitmap write error occurred but the later writes succeeded. | |
494 | */ | |
495 | sb->state = cpu_to_le32(bitmap->flags & ~BIT(BITMAP_WRITE_ERROR)); | |
43a70507 N |
496 | /* Just in case these have been changed via sysfs: */ |
497 | sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); | |
498 | sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); | |
b81a0404 N |
499 | /* This might have been changed by a reshape */ |
500 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
501 | sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize); | |
c4ce867f | 502 | sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes); |
1dff2b87 N |
503 | sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> |
504 | bitmap_info.space); | |
b2f46e68 | 505 | kunmap_atomic(sb); |
d7038f95 CH |
506 | |
507 | if (bitmap->storage.file) | |
508 | write_file_page(bitmap, bitmap->storage.sb_page, 1); | |
509 | else | |
510 | write_sb_page(bitmap, bitmap->storage.sb_index, | |
511 | bitmap->storage.sb_page, 1); | |
32a7627c | 512 | } |
e64e4018 | 513 | EXPORT_SYMBOL(md_bitmap_update_sb); |
32a7627c N |
514 | |
515 | /* print out the bitmap file superblock */ | |
e64e4018 | 516 | void md_bitmap_print_sb(struct bitmap *bitmap) |
32a7627c N |
517 | { |
518 | bitmap_super_t *sb; | |
519 | ||
1ec885cd | 520 | if (!bitmap || !bitmap->storage.sb_page) |
32a7627c | 521 | return; |
1ec885cd | 522 | sb = kmap_atomic(bitmap->storage.sb_page); |
ec0cc226 N |
523 | pr_debug("%s: bitmap file superblock:\n", bmname(bitmap)); |
524 | pr_debug(" magic: %08x\n", le32_to_cpu(sb->magic)); | |
45552111 | 525 | pr_debug(" version: %u\n", le32_to_cpu(sb->version)); |
ec0cc226 | 526 | pr_debug(" uuid: %08x.%08x.%08x.%08x\n", |
c35403f8 CH |
527 | le32_to_cpu(*(__le32 *)(sb->uuid+0)), |
528 | le32_to_cpu(*(__le32 *)(sb->uuid+4)), | |
529 | le32_to_cpu(*(__le32 *)(sb->uuid+8)), | |
530 | le32_to_cpu(*(__le32 *)(sb->uuid+12))); | |
ec0cc226 N |
531 | pr_debug(" events: %llu\n", |
532 | (unsigned long long) le64_to_cpu(sb->events)); | |
533 | pr_debug("events cleared: %llu\n", | |
534 | (unsigned long long) le64_to_cpu(sb->events_cleared)); | |
535 | pr_debug(" state: %08x\n", le32_to_cpu(sb->state)); | |
45552111 FEM |
536 | pr_debug(" chunksize: %u B\n", le32_to_cpu(sb->chunksize)); |
537 | pr_debug(" daemon sleep: %us\n", le32_to_cpu(sb->daemon_sleep)); | |
ec0cc226 N |
538 | pr_debug(" sync size: %llu KB\n", |
539 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
45552111 | 540 | pr_debug("max write behind: %u\n", le32_to_cpu(sb->write_behind)); |
b2f46e68 | 541 | kunmap_atomic(sb); |
32a7627c N |
542 | } |
543 | ||
9c81075f JB |
544 | /* |
545 | * bitmap_new_disk_sb | |
546 | * @bitmap | |
547 | * | |
548 | * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb | |
549 | * reads and verifies the on-disk bitmap superblock and populates bitmap_info. | |
550 | * This function verifies 'bitmap_info' and populates the on-disk bitmap | |
551 | * structure, which is to be written to disk. | |
552 | * | |
553 | * Returns: 0 on success, -Exxx on error | |
554 | */ | |
e64e4018 | 555 | static int md_bitmap_new_disk_sb(struct bitmap *bitmap) |
9c81075f JB |
556 | { |
557 | bitmap_super_t *sb; | |
558 | unsigned long chunksize, daemon_sleep, write_behind; | |
9c81075f | 559 | |
d3b178ad | 560 | bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
582e2e05 JM |
561 | if (bitmap->storage.sb_page == NULL) |
562 | return -ENOMEM; | |
d7038f95 | 563 | bitmap->storage.sb_index = 0; |
9c81075f | 564 | |
1ec885cd | 565 | sb = kmap_atomic(bitmap->storage.sb_page); |
9c81075f JB |
566 | |
567 | sb->magic = cpu_to_le32(BITMAP_MAGIC); | |
568 | sb->version = cpu_to_le32(BITMAP_MAJOR_HI); | |
569 | ||
570 | chunksize = bitmap->mddev->bitmap_info.chunksize; | |
571 | BUG_ON(!chunksize); | |
572 | if (!is_power_of_2(chunksize)) { | |
b2f46e68 | 573 | kunmap_atomic(sb); |
ec0cc226 | 574 | pr_warn("bitmap chunksize not a power of 2\n"); |
9c81075f JB |
575 | return -EINVAL; |
576 | } | |
577 | sb->chunksize = cpu_to_le32(chunksize); | |
578 | ||
579 | daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; | |
c97e0602 | 580 | if (!daemon_sleep || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { |
ec0cc226 | 581 | pr_debug("Choosing daemon_sleep default (5 sec)\n"); |
9c81075f JB |
582 | daemon_sleep = 5 * HZ; |
583 | } | |
584 | sb->daemon_sleep = cpu_to_le32(daemon_sleep); | |
585 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
586 | ||
587 | /* | |
588 | * FIXME: write_behind for RAID1. If not specified, what | |
589 | * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. | |
590 | */ | |
591 | write_behind = bitmap->mddev->bitmap_info.max_write_behind; | |
592 | if (write_behind > COUNTER_MAX) | |
593 | write_behind = COUNTER_MAX / 2; | |
594 | sb->write_behind = cpu_to_le32(write_behind); | |
595 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
596 | ||
597 | /* keep the array size field of the bitmap superblock up to date */ | |
598 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
599 | ||
600 | memcpy(sb->uuid, bitmap->mddev->uuid, 16); | |
601 | ||
b405fe91 | 602 | set_bit(BITMAP_STALE, &bitmap->flags); |
84e92345 | 603 | sb->state = cpu_to_le32(bitmap->flags); |
9c81075f JB |
604 | bitmap->events_cleared = bitmap->mddev->events; |
605 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
d3b178ad | 606 | bitmap->mddev->bitmap_info.nodes = 0; |
9c81075f | 607 | |
b2f46e68 | 608 | kunmap_atomic(sb); |
9c81075f JB |
609 | |
610 | return 0; | |
611 | } | |
612 | ||
32a7627c | 613 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
e64e4018 | 614 | static int md_bitmap_read_sb(struct bitmap *bitmap) |
32a7627c N |
615 | { |
616 | char *reason = NULL; | |
617 | bitmap_super_t *sb; | |
4b6d287f | 618 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c | 619 | unsigned long long events; |
c4ce867f | 620 | int nodes = 0; |
1dff2b87 | 621 | unsigned long sectors_reserved = 0; |
32a7627c | 622 | int err = -EINVAL; |
27581e5a | 623 | struct page *sb_page; |
f5f2d5ac | 624 | loff_t offset = 0; |
32a7627c | 625 | |
1ec885cd | 626 | if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { |
ef99bf48 N |
627 | chunksize = 128 * 1024 * 1024; |
628 | daemon_sleep = 5 * HZ; | |
629 | write_behind = 0; | |
b405fe91 | 630 | set_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
631 | err = 0; |
632 | goto out_no_sb; | |
633 | } | |
32a7627c | 634 | /* page 0 is the superblock, read it... */ |
27581e5a N |
635 | sb_page = alloc_page(GFP_KERNEL); |
636 | if (!sb_page) | |
637 | return -ENOMEM; | |
1ec885cd | 638 | bitmap->storage.sb_page = sb_page; |
27581e5a | 639 | |
b97e9257 | 640 | re_read: |
f9209a32 GR |
641 | /* If cluster_slot is set, the cluster is setup */ |
642 | if (bitmap->cluster_slot >= 0) { | |
3b0e6aac | 643 | sector_t bm_blocks = bitmap->mddev->resync_max_sectors; |
f9209a32 | 644 | |
a913096d ZH |
645 | bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, |
646 | (bitmap->mddev->bitmap_info.chunksize >> 9)); | |
124eb761 GR |
647 | /* bits to bytes */ |
648 | bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t); | |
649 | /* to 4k blocks */ | |
935f3d4f | 650 | bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096); |
f5f2d5ac | 651 | offset = bitmap->cluster_slot * (bm_blocks << 3); |
ec0cc226 | 652 | pr_debug("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__, |
33e38ac6 | 653 | bitmap->cluster_slot, offset); |
f9209a32 GR |
654 | } |
655 | ||
1ec885cd N |
656 | if (bitmap->storage.file) { |
657 | loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); | |
f49d5e62 N |
658 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
659 | ||
d681054c | 660 | err = read_file_page(bitmap->storage.file, 0, |
27581e5a | 661 | bitmap, bytes, sb_page); |
f49d5e62 | 662 | } else { |
f5f2d5ac CH |
663 | err = read_sb_page(bitmap->mddev, offset, sb_page, 0, |
664 | sizeof(bitmap_super_t)); | |
a654b9d8 | 665 | } |
27581e5a | 666 | if (err) |
32a7627c | 667 | return err; |
32a7627c | 668 | |
b97e9257 | 669 | err = -EINVAL; |
27581e5a | 670 | sb = kmap_atomic(sb_page); |
32a7627c | 671 | |
32a7627c | 672 | chunksize = le32_to_cpu(sb->chunksize); |
1b04be96 | 673 | daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; |
4b6d287f | 674 | write_behind = le32_to_cpu(sb->write_behind); |
1dff2b87 | 675 | sectors_reserved = le32_to_cpu(sb->sectors_reserved); |
32a7627c N |
676 | |
677 | /* verify that the bitmap-specific fields are valid */ | |
678 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
679 | reason = "bad magic"; | |
bd926c63 | 680 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
3c462c88 | 681 | le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED) |
32a7627c | 682 | reason = "unrecognized superblock version"; |
1187cf0a | 683 | else if (chunksize < 512) |
7dd5d34c | 684 | reason = "bitmap chunksize too small"; |
d744540c | 685 | else if (!is_power_of_2(chunksize)) |
32a7627c | 686 | reason = "bitmap chunksize not a power of 2"; |
1b04be96 | 687 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) |
7dd5d34c | 688 | reason = "daemon sleep period out of range"; |
4b6d287f N |
689 | else if (write_behind > COUNTER_MAX) |
690 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c | 691 | if (reason) { |
ec0cc226 | 692 | pr_warn("%s: invalid bitmap file superblock: %s\n", |
32a7627c N |
693 | bmname(bitmap), reason); |
694 | goto out; | |
695 | } | |
696 | ||
e68cb83a HZ |
697 | /* |
698 | * Setup nodes/clustername only if bitmap version is | |
699 | * cluster-compatible | |
700 | */ | |
701 | if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) { | |
702 | nodes = le32_to_cpu(sb->nodes); | |
92d9aac9 | 703 | strscpy(bitmap->mddev->bitmap_info.cluster_name, |
e68cb83a HZ |
704 | sb->cluster_name, 64); |
705 | } | |
706 | ||
32a7627c N |
707 | /* keep the array size field of the bitmap superblock up to date */ |
708 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
709 | ||
278c1ca2 N |
710 | if (bitmap->mddev->persistent) { |
711 | /* | |
712 | * We have a persistent array superblock, so compare the | |
713 | * bitmap's UUID and event counter to the mddev's | |
714 | */ | |
715 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
ec0cc226 N |
716 | pr_warn("%s: bitmap superblock UUID mismatch\n", |
717 | bmname(bitmap)); | |
278c1ca2 N |
718 | goto out; |
719 | } | |
720 | events = le64_to_cpu(sb->events); | |
b97e9257 | 721 | if (!nodes && (events < bitmap->mddev->events)) { |
ec0cc226 N |
722 | pr_warn("%s: bitmap file is out of date (%llu < %llu) -- forcing full recovery\n", |
723 | bmname(bitmap), events, | |
724 | (unsigned long long) bitmap->mddev->events); | |
b405fe91 | 725 | set_bit(BITMAP_STALE, &bitmap->flags); |
278c1ca2 | 726 | } |
32a7627c | 727 | } |
278c1ca2 | 728 | |
32a7627c | 729 | /* assign fields using values from superblock */ |
4f2e639a | 730 | bitmap->flags |= le32_to_cpu(sb->state); |
bd926c63 | 731 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
b405fe91 | 732 | set_bit(BITMAP_HOSTENDIAN, &bitmap->flags); |
32a7627c N |
733 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
734 | err = 0; | |
b97e9257 | 735 | |
32a7627c | 736 | out: |
b2f46e68 | 737 | kunmap_atomic(sb); |
f7357273 | 738 | if (err == 0 && nodes && (bitmap->cluster_slot < 0)) { |
e68cb83a HZ |
739 | /* Assigning chunksize is required for "re_read" */ |
740 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
b97e9257 GR |
741 | err = md_setup_cluster(bitmap->mddev, nodes); |
742 | if (err) { | |
ec0cc226 N |
743 | pr_warn("%s: Could not setup cluster service (%d)\n", |
744 | bmname(bitmap), err); | |
b97e9257 GR |
745 | goto out_no_sb; |
746 | } | |
747 | bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev); | |
b97e9257 GR |
748 | goto re_read; |
749 | } | |
750 | ||
ef99bf48 | 751 | out_no_sb: |
e68cb83a HZ |
752 | if (err == 0) { |
753 | if (test_bit(BITMAP_STALE, &bitmap->flags)) | |
754 | bitmap->events_cleared = bitmap->mddev->events; | |
755 | bitmap->mddev->bitmap_info.chunksize = chunksize; | |
756 | bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; | |
757 | bitmap->mddev->bitmap_info.max_write_behind = write_behind; | |
758 | bitmap->mddev->bitmap_info.nodes = nodes; | |
759 | if (bitmap->mddev->bitmap_info.space == 0 || | |
760 | bitmap->mddev->bitmap_info.space > sectors_reserved) | |
761 | bitmap->mddev->bitmap_info.space = sectors_reserved; | |
762 | } else { | |
e64e4018 | 763 | md_bitmap_print_sb(bitmap); |
f9209a32 | 764 | if (bitmap->cluster_slot < 0) |
b97e9257 GR |
765 | md_cluster_stop(bitmap->mddev); |
766 | } | |
32a7627c N |
767 | return err; |
768 | } | |
769 | ||
32a7627c N |
770 | /* |
771 | * general bitmap file operations | |
772 | */ | |
773 | ||
ece5cff0 N |
774 | /* |
775 | * on-disk bitmap: | |
776 | * | |
777 | * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap | |
778 | * file a page at a time. There's a superblock at the start of the file. | |
779 | */ | |
32a7627c | 780 | /* calculate the index of the page that contains this bit */ |
1ec885cd N |
781 | static inline unsigned long file_page_index(struct bitmap_storage *store, |
782 | unsigned long chunk) | |
32a7627c | 783 | { |
1ec885cd | 784 | if (store->sb_page) |
ece5cff0 N |
785 | chunk += sizeof(bitmap_super_t) << 3; |
786 | return chunk >> PAGE_BIT_SHIFT; | |
32a7627c N |
787 | } |
788 | ||
789 | /* calculate the (bit) offset of this bit within a page */ | |
1ec885cd N |
790 | static inline unsigned long file_page_offset(struct bitmap_storage *store, |
791 | unsigned long chunk) | |
32a7627c | 792 | { |
1ec885cd | 793 | if (store->sb_page) |
ece5cff0 N |
794 | chunk += sizeof(bitmap_super_t) << 3; |
795 | return chunk & (PAGE_BITS - 1); | |
32a7627c N |
796 | } |
797 | ||
798 | /* | |
799 | * return a pointer to the page in the filemap that contains the given bit | |
800 | * | |
32a7627c | 801 | */ |
1ec885cd | 802 | static inline struct page *filemap_get_page(struct bitmap_storage *store, |
3520fa4d | 803 | unsigned long chunk) |
32a7627c | 804 | { |
1ec885cd | 805 | if (file_page_index(store, chunk) >= store->file_pages) |
ac2f40be | 806 | return NULL; |
f2e06c58 | 807 | return store->filemap[file_page_index(store, chunk)]; |
32a7627c N |
808 | } |
809 | ||
e64e4018 AS |
810 | static int md_bitmap_storage_alloc(struct bitmap_storage *store, |
811 | unsigned long chunks, int with_super, | |
812 | int slot_number) | |
d1244cb0 | 813 | { |
b97e9257 | 814 | int pnum, offset = 0; |
d1244cb0 N |
815 | unsigned long num_pages; |
816 | unsigned long bytes; | |
817 | ||
818 | bytes = DIV_ROUND_UP(chunks, 8); | |
819 | if (with_super) | |
820 | bytes += sizeof(bitmap_super_t); | |
821 | ||
822 | num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); | |
7f86ffed | 823 | offset = slot_number * num_pages; |
d1244cb0 | 824 | |
6da2ec56 KC |
825 | store->filemap = kmalloc_array(num_pages, sizeof(struct page *), |
826 | GFP_KERNEL); | |
d1244cb0 N |
827 | if (!store->filemap) |
828 | return -ENOMEM; | |
829 | ||
830 | if (with_super && !store->sb_page) { | |
d60b479d | 831 | store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
832 | if (store->sb_page == NULL) |
833 | return -ENOMEM; | |
d1244cb0 | 834 | } |
b97e9257 | 835 | |
d1244cb0 N |
836 | pnum = 0; |
837 | if (store->sb_page) { | |
838 | store->filemap[0] = store->sb_page; | |
839 | pnum = 1; | |
d7038f95 | 840 | store->sb_index = offset; |
d1244cb0 | 841 | } |
b97e9257 | 842 | |
d1244cb0 | 843 | for ( ; pnum < num_pages; pnum++) { |
d60b479d | 844 | store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO); |
d1244cb0 N |
845 | if (!store->filemap[pnum]) { |
846 | store->file_pages = pnum; | |
847 | return -ENOMEM; | |
848 | } | |
d1244cb0 N |
849 | } |
850 | store->file_pages = pnum; | |
851 | ||
852 | /* We need 4 bits per page, rounded up to a multiple | |
853 | * of sizeof(unsigned long) */ | |
854 | store->filemap_attr = kzalloc( | |
855 | roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), | |
856 | GFP_KERNEL); | |
857 | if (!store->filemap_attr) | |
858 | return -ENOMEM; | |
859 | ||
860 | store->bytes = bytes; | |
861 | ||
862 | return 0; | |
863 | } | |
864 | ||
e64e4018 | 865 | static void md_bitmap_file_unmap(struct bitmap_storage *store) |
32a7627c | 866 | { |
546ac0b2 CH |
867 | struct file *file = store->file; |
868 | struct page *sb_page = store->sb_page; | |
869 | struct page **map = store->filemap; | |
870 | int pages = store->file_pages; | |
32a7627c N |
871 | |
872 | while (pages--) | |
ece5cff0 | 873 | if (map[pages] != sb_page) /* 0 is sb_page, release it below */ |
d785a06a | 874 | free_buffers(map[pages]); |
32a7627c | 875 | kfree(map); |
fae7d326 | 876 | kfree(store->filemap_attr); |
32a7627c | 877 | |
d785a06a N |
878 | if (sb_page) |
879 | free_buffers(sb_page); | |
32a7627c | 880 | |
d785a06a | 881 | if (file) { |
496ad9aa | 882 | struct inode *inode = file_inode(file); |
fc0ecff6 | 883 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
32a7627c | 884 | fput(file); |
d785a06a | 885 | } |
32a7627c N |
886 | } |
887 | ||
32a7627c N |
888 | /* |
889 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
890 | * then it is no longer reliable, so we stop using it and we mark the file | |
891 | * as failed in the superblock | |
892 | */ | |
e64e4018 | 893 | static void md_bitmap_file_kick(struct bitmap *bitmap) |
32a7627c | 894 | { |
b405fe91 | 895 | if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) { |
e64e4018 | 896 | md_bitmap_update_sb(bitmap); |
32a7627c | 897 | |
1ec885cd | 898 | if (bitmap->storage.file) { |
92348518 CH |
899 | pr_warn("%s: kicking failed bitmap file %pD4 from array!\n", |
900 | bmname(bitmap), bitmap->storage.file); | |
32a7627c | 901 | |
4ad13663 | 902 | } else |
ec0cc226 N |
903 | pr_warn("%s: disabling internal bitmap due to errors\n", |
904 | bmname(bitmap)); | |
a654b9d8 | 905 | } |
32a7627c N |
906 | } |
907 | ||
908 | enum bitmap_page_attr { | |
ac2f40be | 909 | BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ |
5a537df4 N |
910 | BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. |
911 | * i.e. counter is 1 or 2. */ | |
ac2f40be | 912 | BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ |
32a7627c N |
913 | }; |
914 | ||
d189122d N |
915 | static inline void set_page_attr(struct bitmap *bitmap, int pnum, |
916 | enum bitmap_page_attr attr) | |
32a7627c | 917 | { |
bdfd1140 | 918 | set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
919 | } |
920 | ||
d189122d N |
921 | static inline void clear_page_attr(struct bitmap *bitmap, int pnum, |
922 | enum bitmap_page_attr attr) | |
32a7627c | 923 | { |
bdfd1140 | 924 | clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
925 | } |
926 | ||
bdfd1140 N |
927 | static inline int test_page_attr(struct bitmap *bitmap, int pnum, |
928 | enum bitmap_page_attr attr) | |
32a7627c | 929 | { |
1ec885cd | 930 | return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); |
32a7627c N |
931 | } |
932 | ||
bdfd1140 N |
933 | static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum, |
934 | enum bitmap_page_attr attr) | |
935 | { | |
936 | return test_and_clear_bit((pnum<<2) + attr, | |
937 | bitmap->storage.filemap_attr); | |
938 | } | |
32a7627c N |
939 | /* |
940 | * bitmap_file_set_bit -- called before performing a write to the md device | |
941 | * to set (and eventually sync) a particular bit in the bitmap file | |
942 | * | |
943 | * we set the bit immediately, then we record the page number so that | |
944 | * when an unplug occurs, we can flush the dirty pages out to disk | |
945 | */ | |
e64e4018 | 946 | static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) |
32a7627c N |
947 | { |
948 | unsigned long bit; | |
3520fa4d | 949 | struct page *page; |
32a7627c | 950 | void *kaddr; |
40cffcc0 | 951 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
23cea66a | 952 | struct bitmap_storage *store = &bitmap->storage; |
d7038f95 | 953 | unsigned long index = file_page_index(store, chunk); |
23cea66a GJ |
954 | unsigned long node_offset = 0; |
955 | ||
ecbd8ebb | 956 | index += store->sb_index; |
23cea66a GJ |
957 | if (mddev_is_clustered(bitmap->mddev)) |
958 | node_offset = bitmap->cluster_slot * store->file_pages; | |
32a7627c | 959 | |
1ec885cd | 960 | page = filemap_get_page(&bitmap->storage, chunk); |
3520fa4d JB |
961 | if (!page) |
962 | return; | |
1ec885cd | 963 | bit = file_page_offset(&bitmap->storage, chunk); |
32a7627c | 964 | |
3520fa4d | 965 | /* set the bit */ |
b2f46e68 | 966 | kaddr = kmap_atomic(page); |
b405fe91 | 967 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
3520fa4d JB |
968 | set_bit(bit, kaddr); |
969 | else | |
3f810b6c | 970 | set_bit_le(bit, kaddr); |
b2f46e68 | 971 | kunmap_atomic(kaddr); |
d7038f95 | 972 | pr_debug("set file bit %lu page %lu\n", bit, index); |
32a7627c | 973 | /* record page number so it gets flushed to disk when unplug occurs */ |
d7038f95 | 974 | set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_DIRTY); |
32a7627c N |
975 | } |
976 | ||
e64e4018 | 977 | static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) |
ef99bf48 N |
978 | { |
979 | unsigned long bit; | |
980 | struct page *page; | |
981 | void *paddr; | |
40cffcc0 | 982 | unsigned long chunk = block >> bitmap->counts.chunkshift; |
23cea66a | 983 | struct bitmap_storage *store = &bitmap->storage; |
d7038f95 | 984 | unsigned long index = file_page_index(store, chunk); |
23cea66a GJ |
985 | unsigned long node_offset = 0; |
986 | ||
ecbd8ebb | 987 | index += store->sb_index; |
23cea66a GJ |
988 | if (mddev_is_clustered(bitmap->mddev)) |
989 | node_offset = bitmap->cluster_slot * store->file_pages; | |
ef99bf48 | 990 | |
1ec885cd | 991 | page = filemap_get_page(&bitmap->storage, chunk); |
ef99bf48 N |
992 | if (!page) |
993 | return; | |
1ec885cd | 994 | bit = file_page_offset(&bitmap->storage, chunk); |
ef99bf48 | 995 | paddr = kmap_atomic(page); |
b405fe91 | 996 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
ef99bf48 N |
997 | clear_bit(bit, paddr); |
998 | else | |
3f810b6c | 999 | clear_bit_le(bit, paddr); |
ef99bf48 | 1000 | kunmap_atomic(paddr); |
d7038f95 CH |
1001 | if (!test_page_attr(bitmap, index - node_offset, BITMAP_PAGE_NEEDWRITE)) { |
1002 | set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_PENDING); | |
ef99bf48 N |
1003 | bitmap->allclean = 0; |
1004 | } | |
1005 | } | |
1006 | ||
e64e4018 | 1007 | static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) |
11dd35da GR |
1008 | { |
1009 | unsigned long bit; | |
1010 | struct page *page; | |
1011 | void *paddr; | |
1012 | unsigned long chunk = block >> bitmap->counts.chunkshift; | |
1013 | int set = 0; | |
1014 | ||
1015 | page = filemap_get_page(&bitmap->storage, chunk); | |
1016 | if (!page) | |
1017 | return -EINVAL; | |
1018 | bit = file_page_offset(&bitmap->storage, chunk); | |
1019 | paddr = kmap_atomic(page); | |
1020 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) | |
1021 | set = test_bit(bit, paddr); | |
1022 | else | |
1023 | set = test_bit_le(bit, paddr); | |
1024 | kunmap_atomic(paddr); | |
1025 | return set; | |
1026 | } | |
1027 | ||
32a7627c N |
1028 | /* this gets called when the md device is ready to unplug its underlying |
1029 | * (slave) device queues -- before we let any writes go down, we need to | |
1030 | * sync the dirty pages of the bitmap file to disk */ | |
e64e4018 | 1031 | void md_bitmap_unplug(struct bitmap *bitmap) |
32a7627c | 1032 | { |
74667123 | 1033 | unsigned long i; |
ec7a3197 | 1034 | int dirty, need_write; |
85c9ccd4 | 1035 | int writing = 0; |
32a7627c | 1036 | |
7db922ba | 1037 | if (!md_bitmap_enabled(bitmap)) |
4ad13663 | 1038 | return; |
32a7627c N |
1039 | |
1040 | /* look at each page to see if there are any set bits that need to be | |
1041 | * flushed out to disk */ | |
1ec885cd | 1042 | for (i = 0; i < bitmap->storage.file_pages; i++) { |
bdfd1140 N |
1043 | dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); |
1044 | need_write = test_and_clear_page_attr(bitmap, i, | |
1045 | BITMAP_PAGE_NEEDWRITE); | |
1046 | if (dirty || need_write) { | |
581dbd94 | 1047 | if (!writing) { |
e64e4018 | 1048 | md_bitmap_wait_writes(bitmap); |
28be4fd3 CH |
1049 | mddev_add_trace_msg(bitmap->mddev, |
1050 | "md bitmap_unplug"); | |
581dbd94 | 1051 | } |
d189122d | 1052 | clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); |
d7038f95 | 1053 | filemap_write_page(bitmap, i, false); |
85c9ccd4 | 1054 | writing = 1; |
bdfd1140 | 1055 | } |
32a7627c | 1056 | } |
85c9ccd4 | 1057 | if (writing) |
e64e4018 | 1058 | md_bitmap_wait_writes(bitmap); |
4b5060dd | 1059 | |
b405fe91 | 1060 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
e64e4018 | 1061 | md_bitmap_file_kick(bitmap); |
32a7627c | 1062 | } |
e64e4018 | 1063 | EXPORT_SYMBOL(md_bitmap_unplug); |
32a7627c | 1064 | |
a022325a YK |
1065 | struct bitmap_unplug_work { |
1066 | struct work_struct work; | |
1067 | struct bitmap *bitmap; | |
1068 | struct completion *done; | |
1069 | }; | |
1070 | ||
1071 | static void md_bitmap_unplug_fn(struct work_struct *work) | |
1072 | { | |
1073 | struct bitmap_unplug_work *unplug_work = | |
1074 | container_of(work, struct bitmap_unplug_work, work); | |
1075 | ||
1076 | md_bitmap_unplug(unplug_work->bitmap); | |
1077 | complete(unplug_work->done); | |
1078 | } | |
1079 | ||
1080 | void md_bitmap_unplug_async(struct bitmap *bitmap) | |
1081 | { | |
1082 | DECLARE_COMPLETION_ONSTACK(done); | |
1083 | struct bitmap_unplug_work unplug_work; | |
1084 | ||
1085 | INIT_WORK_ONSTACK(&unplug_work.work, md_bitmap_unplug_fn); | |
1086 | unplug_work.bitmap = bitmap; | |
1087 | unplug_work.done = &done; | |
1088 | ||
1089 | queue_work(md_bitmap_wq, &unplug_work.work); | |
1090 | wait_for_completion(&done); | |
1091 | } | |
1092 | EXPORT_SYMBOL(md_bitmap_unplug_async); | |
1093 | ||
e64e4018 | 1094 | static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
844dc669 CH |
1095 | |
1096 | /* | |
1097 | * Initialize the in-memory bitmap from the on-disk bitmap and set up the memory | |
1098 | * mapping of the bitmap file. | |
1099 | * | |
1100 | * Special case: If there's no bitmap file, or if the bitmap file had been | |
1101 | * previously kicked from the array, we mark all the bits as 1's in order to | |
1102 | * cause a full resync. | |
6a07997f N |
1103 | * |
1104 | * We ignore all bits for sectors that end earlier than 'start'. | |
844dc669 | 1105 | * This is used when reading an out-of-date bitmap. |
32a7627c | 1106 | */ |
e64e4018 | 1107 | static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c | 1108 | { |
844dc669 CH |
1109 | bool outofdate = test_bit(BITMAP_STALE, &bitmap->flags); |
1110 | struct mddev *mddev = bitmap->mddev; | |
1111 | unsigned long chunks = bitmap->counts.chunks; | |
1ec885cd | 1112 | struct bitmap_storage *store = &bitmap->storage; |
844dc669 CH |
1113 | struct file *file = store->file; |
1114 | unsigned long node_offset = 0; | |
1115 | unsigned long bit_cnt = 0; | |
1116 | unsigned long i; | |
1117 | int ret; | |
32a7627c | 1118 | |
844dc669 | 1119 | if (!file && !mddev->bitmap_info.offset) { |
ef99bf48 | 1120 | /* No permanent bitmap - fill with '1s'. */ |
1ec885cd N |
1121 | store->filemap = NULL; |
1122 | store->file_pages = 0; | |
ef99bf48 N |
1123 | for (i = 0; i < chunks ; i++) { |
1124 | /* if the disk bit is set, set the memory bit */ | |
40cffcc0 | 1125 | int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift) |
ef99bf48 | 1126 | >= start); |
e64e4018 AS |
1127 | md_bitmap_set_memory_bits(bitmap, |
1128 | (sector_t)i << bitmap->counts.chunkshift, | |
1129 | needed); | |
ef99bf48 N |
1130 | } |
1131 | return 0; | |
1132 | } | |
32a7627c | 1133 | |
d1244cb0 | 1134 | if (file && i_size_read(file->f_mapping->host) < store->bytes) { |
ec0cc226 N |
1135 | pr_warn("%s: bitmap file too short %lu < %lu\n", |
1136 | bmname(bitmap), | |
1137 | (unsigned long) i_size_read(file->f_mapping->host), | |
1138 | store->bytes); | |
844dc669 | 1139 | ret = -ENOSPC; |
4ad13663 | 1140 | goto err; |
32a7627c | 1141 | } |
bc7f77de | 1142 | |
844dc669 | 1143 | if (mddev_is_clustered(mddev)) |
b97e9257 GR |
1144 | node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE)); |
1145 | ||
844dc669 CH |
1146 | for (i = 0; i < store->file_pages; i++) { |
1147 | struct page *page = store->filemap[i]; | |
1148 | int count; | |
27581e5a | 1149 | |
844dc669 CH |
1150 | /* unmap the old page, we're done with it */ |
1151 | if (i == store->file_pages - 1) | |
1152 | count = store->bytes - i * PAGE_SIZE; | |
1153 | else | |
1154 | count = PAGE_SIZE; | |
1155 | ||
1156 | if (file) | |
1157 | ret = read_file_page(file, i, bitmap, count, page); | |
1158 | else | |
f5f2d5ac CH |
1159 | ret = read_sb_page(mddev, 0, page, i + node_offset, |
1160 | count); | |
844dc669 CH |
1161 | if (ret) |
1162 | goto err; | |
1163 | } | |
1164 | ||
1165 | if (outofdate) { | |
1166 | pr_warn("%s: bitmap file is out of date, doing full recovery\n", | |
1167 | bmname(bitmap)); | |
a654b9d8 | 1168 | |
844dc669 CH |
1169 | for (i = 0; i < store->file_pages; i++) { |
1170 | struct page *page = store->filemap[i]; | |
1171 | unsigned long offset = 0; | |
1172 | void *paddr; | |
32a7627c | 1173 | |
844dc669 CH |
1174 | if (i == 0 && !mddev->bitmap_info.external) |
1175 | offset = sizeof(bitmap_super_t); | |
4ad13663 | 1176 | |
844dc669 CH |
1177 | /* |
1178 | * If the bitmap is out of date, dirty the whole page | |
1179 | * and write it out | |
1180 | */ | |
1181 | paddr = kmap_atomic(page); | |
1182 | memset(paddr + offset, 0xff, PAGE_SIZE - offset); | |
1183 | kunmap_atomic(paddr); | |
1184 | ||
d7038f95 | 1185 | filemap_write_page(bitmap, i, true); |
844dc669 | 1186 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) { |
4ad13663 | 1187 | ret = -EIO; |
844dc669 | 1188 | goto err; |
32a7627c | 1189 | } |
32a7627c | 1190 | } |
844dc669 CH |
1191 | } |
1192 | ||
1193 | for (i = 0; i < chunks; i++) { | |
1194 | struct page *page = filemap_get_page(&bitmap->storage, i); | |
1195 | unsigned long bit = file_page_offset(&bitmap->storage, i); | |
1196 | void *paddr; | |
1197 | bool was_set; | |
1198 | ||
b2f46e68 | 1199 | paddr = kmap_atomic(page); |
b405fe91 | 1200 | if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) |
844dc669 | 1201 | was_set = test_bit(bit, paddr); |
bd926c63 | 1202 | else |
844dc669 | 1203 | was_set = test_bit_le(bit, paddr); |
b2f46e68 | 1204 | kunmap_atomic(paddr); |
844dc669 CH |
1205 | |
1206 | if (was_set) { | |
32a7627c | 1207 | /* if the disk bit is set, set the memory bit */ |
40cffcc0 | 1208 | int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift |
db305e50 | 1209 | >= start); |
e64e4018 AS |
1210 | md_bitmap_set_memory_bits(bitmap, |
1211 | (sector_t)i << bitmap->counts.chunkshift, | |
1212 | needed); | |
32a7627c N |
1213 | bit_cnt++; |
1214 | } | |
32a7627c N |
1215 | } |
1216 | ||
ec0cc226 N |
1217 | pr_debug("%s: bitmap initialized from disk: read %lu pages, set %lu of %lu bits\n", |
1218 | bmname(bitmap), store->file_pages, | |
1219 | bit_cnt, chunks); | |
4ad13663 N |
1220 | |
1221 | return 0; | |
32a7627c | 1222 | |
4ad13663 | 1223 | err: |
ec0cc226 N |
1224 | pr_warn("%s: bitmap initialisation failed: %d\n", |
1225 | bmname(bitmap), ret); | |
32a7627c N |
1226 | return ret; |
1227 | } | |
1228 | ||
e64e4018 | 1229 | void md_bitmap_write_all(struct bitmap *bitmap) |
a654b9d8 N |
1230 | { |
1231 | /* We don't actually write all bitmap blocks here, | |
1232 | * just flag them as needing to be written | |
1233 | */ | |
ec7a3197 | 1234 | int i; |
a654b9d8 | 1235 | |
1ec885cd | 1236 | if (!bitmap || !bitmap->storage.filemap) |
ef99bf48 | 1237 | return; |
1ec885cd | 1238 | if (bitmap->storage.file) |
ef99bf48 N |
1239 | /* Only one copy, so nothing needed */ |
1240 | return; | |
1241 | ||
1ec885cd | 1242 | for (i = 0; i < bitmap->storage.file_pages; i++) |
d189122d | 1243 | set_page_attr(bitmap, i, |
ec7a3197 | 1244 | BITMAP_PAGE_NEEDWRITE); |
2585f3ef | 1245 | bitmap->allclean = 0; |
a654b9d8 N |
1246 | } |
1247 | ||
e64e4018 AS |
1248 | static void md_bitmap_count_page(struct bitmap_counts *bitmap, |
1249 | sector_t offset, int inc) | |
32a7627c | 1250 | { |
61a0d80c | 1251 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1252 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1253 | bitmap->bp[page].count += inc; | |
e64e4018 | 1254 | md_bitmap_checkfree(bitmap, page); |
32a7627c | 1255 | } |
bf07bb7d | 1256 | |
e64e4018 | 1257 | static void md_bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset) |
bf07bb7d N |
1258 | { |
1259 | sector_t chunk = offset >> bitmap->chunkshift; | |
1260 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1261 | struct bitmap_page *bp = &bitmap->bp[page]; | |
1262 | ||
1263 | if (!bp->pending) | |
1264 | bp->pending = 1; | |
1265 | } | |
1266 | ||
e64e4018 AS |
1267 | static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap, |
1268 | sector_t offset, sector_t *blocks, | |
1269 | int create); | |
32a7627c | 1270 | |
4eeb6535 YK |
1271 | static void mddev_set_timeout(struct mddev *mddev, unsigned long timeout, |
1272 | bool force) | |
1273 | { | |
44693154 YK |
1274 | struct md_thread *thread; |
1275 | ||
1276 | rcu_read_lock(); | |
1277 | thread = rcu_dereference(mddev->thread); | |
4eeb6535 YK |
1278 | |
1279 | if (!thread) | |
44693154 | 1280 | goto out; |
4eeb6535 YK |
1281 | |
1282 | if (force || thread->timeout < MAX_SCHEDULE_TIMEOUT) | |
1283 | thread->timeout = timeout; | |
44693154 YK |
1284 | |
1285 | out: | |
1286 | rcu_read_unlock(); | |
4eeb6535 YK |
1287 | } |
1288 | ||
32a7627c N |
1289 | /* |
1290 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
1291 | * out to disk | |
1292 | */ | |
e64e4018 | 1293 | void md_bitmap_daemon_work(struct mddev *mddev) |
32a7627c | 1294 | { |
aa5cbd10 | 1295 | struct bitmap *bitmap; |
aa3163f8 | 1296 | unsigned long j; |
bf07bb7d | 1297 | unsigned long nextpage; |
57dab0bd | 1298 | sector_t blocks; |
40cffcc0 | 1299 | struct bitmap_counts *counts; |
32a7627c | 1300 | |
aa5cbd10 N |
1301 | /* Use a mutex to guard daemon_work against |
1302 | * bitmap_destroy. | |
1303 | */ | |
c3d9714e | 1304 | mutex_lock(&mddev->bitmap_info.mutex); |
aa5cbd10 N |
1305 | bitmap = mddev->bitmap; |
1306 | if (bitmap == NULL) { | |
c3d9714e | 1307 | mutex_unlock(&mddev->bitmap_info.mutex); |
4ad13663 | 1308 | return; |
aa5cbd10 | 1309 | } |
42a04b50 | 1310 | if (time_before(jiffies, bitmap->daemon_lastrun |
2e61ebbc | 1311 | + mddev->bitmap_info.daemon_sleep)) |
7be3dfec N |
1312 | goto done; |
1313 | ||
32a7627c | 1314 | bitmap->daemon_lastrun = jiffies; |
8311c29d | 1315 | if (bitmap->allclean) { |
4eeb6535 | 1316 | mddev_set_timeout(mddev, MAX_SCHEDULE_TIMEOUT, true); |
aa5cbd10 | 1317 | goto done; |
8311c29d N |
1318 | } |
1319 | bitmap->allclean = 1; | |
32a7627c | 1320 | |
28be4fd3 | 1321 | mddev_add_trace_msg(bitmap->mddev, "md bitmap_daemon_work"); |
581dbd94 | 1322 | |
bf07bb7d N |
1323 | /* Any file-page which is PENDING now needs to be written. |
1324 | * So set NEEDWRITE now, then after we make any last-minute changes | |
1325 | * we will write it. | |
1326 | */ | |
1ec885cd | 1327 | for (j = 0; j < bitmap->storage.file_pages; j++) |
bdfd1140 N |
1328 | if (test_and_clear_page_attr(bitmap, j, |
1329 | BITMAP_PAGE_PENDING)) | |
d189122d | 1330 | set_page_attr(bitmap, j, |
bf07bb7d | 1331 | BITMAP_PAGE_NEEDWRITE); |
bf07bb7d N |
1332 | |
1333 | if (bitmap->need_sync && | |
1334 | mddev->bitmap_info.external == 0) { | |
1335 | /* Arrange for superblock update as well as | |
1336 | * other changes */ | |
1337 | bitmap_super_t *sb; | |
1338 | bitmap->need_sync = 0; | |
1ec885cd N |
1339 | if (bitmap->storage.filemap) { |
1340 | sb = kmap_atomic(bitmap->storage.sb_page); | |
ef99bf48 N |
1341 | sb->events_cleared = |
1342 | cpu_to_le64(bitmap->events_cleared); | |
1343 | kunmap_atomic(sb); | |
d189122d | 1344 | set_page_attr(bitmap, 0, |
ef99bf48 N |
1345 | BITMAP_PAGE_NEEDWRITE); |
1346 | } | |
bf07bb7d N |
1347 | } |
1348 | /* Now look at the bitmap counters and if any are '2' or '1', | |
1349 | * decrement and handle accordingly. | |
1350 | */ | |
40cffcc0 N |
1351 | counts = &bitmap->counts; |
1352 | spin_lock_irq(&counts->lock); | |
bf07bb7d | 1353 | nextpage = 0; |
40cffcc0 | 1354 | for (j = 0; j < counts->chunks; j++) { |
32a7627c | 1355 | bitmap_counter_t *bmc; |
40cffcc0 | 1356 | sector_t block = (sector_t)j << counts->chunkshift; |
3520fa4d | 1357 | |
bf07bb7d N |
1358 | if (j == nextpage) { |
1359 | nextpage += PAGE_COUNTER_RATIO; | |
40cffcc0 | 1360 | if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) { |
bf07bb7d | 1361 | j |= PAGE_COUNTER_MASK; |
aa3163f8 N |
1362 | continue; |
1363 | } | |
40cffcc0 | 1364 | counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; |
32a7627c | 1365 | } |
bf07bb7d | 1366 | |
e64e4018 | 1367 | bmc = md_bitmap_get_counter(counts, block, &blocks, 0); |
bf07bb7d | 1368 | if (!bmc) { |
5a537df4 | 1369 | j |= PAGE_COUNTER_MASK; |
bf07bb7d N |
1370 | continue; |
1371 | } | |
1372 | if (*bmc == 1 && !bitmap->need_sync) { | |
1373 | /* We can clear the bit */ | |
bf07bb7d | 1374 | *bmc = 0; |
e64e4018 AS |
1375 | md_bitmap_count_page(counts, block, -1); |
1376 | md_bitmap_file_clear_bit(bitmap, block); | |
bf07bb7d N |
1377 | } else if (*bmc && *bmc <= 2) { |
1378 | *bmc = 1; | |
e64e4018 | 1379 | md_bitmap_set_pending(counts, block); |
bf07bb7d | 1380 | bitmap->allclean = 0; |
5a537df4 | 1381 | } |
32a7627c | 1382 | } |
40cffcc0 | 1383 | spin_unlock_irq(&counts->lock); |
32a7627c | 1384 | |
e64e4018 | 1385 | md_bitmap_wait_writes(bitmap); |
bf07bb7d N |
1386 | /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. |
1387 | * DIRTY pages need to be written by bitmap_unplug so it can wait | |
1388 | * for them. | |
1389 | * If we find any DIRTY page we stop there and let bitmap_unplug | |
1390 | * handle all the rest. This is important in the case where | |
1391 | * the first blocking holds the superblock and it has been updated. | |
1392 | * We mustn't write any other blocks before the superblock. | |
1393 | */ | |
62f82faa N |
1394 | for (j = 0; |
1395 | j < bitmap->storage.file_pages | |
1396 | && !test_bit(BITMAP_STALE, &bitmap->flags); | |
1397 | j++) { | |
d189122d | 1398 | if (test_page_attr(bitmap, j, |
bf07bb7d N |
1399 | BITMAP_PAGE_DIRTY)) |
1400 | /* bitmap_unplug will handle the rest */ | |
1401 | break; | |
55180498 ZL |
1402 | if (bitmap->storage.filemap && |
1403 | test_and_clear_page_attr(bitmap, j, | |
d7038f95 CH |
1404 | BITMAP_PAGE_NEEDWRITE)) |
1405 | filemap_write_page(bitmap, j, false); | |
32a7627c N |
1406 | } |
1407 | ||
7be3dfec | 1408 | done: |
8311c29d | 1409 | if (bitmap->allclean == 0) |
4eeb6535 | 1410 | mddev_set_timeout(mddev, mddev->bitmap_info.daemon_sleep, true); |
c3d9714e | 1411 | mutex_unlock(&mddev->bitmap_info.mutex); |
32a7627c N |
1412 | } |
1413 | ||
e64e4018 AS |
1414 | static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap, |
1415 | sector_t offset, sector_t *blocks, | |
1416 | int create) | |
ee305ace N |
1417 | __releases(bitmap->lock) |
1418 | __acquires(bitmap->lock) | |
32a7627c N |
1419 | { |
1420 | /* If 'create', we might release the lock and reclaim it. | |
1421 | * The lock must have been taken with interrupts enabled. | |
1422 | * If !create, we don't release the lock. | |
1423 | */ | |
61a0d80c | 1424 | sector_t chunk = offset >> bitmap->chunkshift; |
32a7627c N |
1425 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
1426 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1427 | sector_t csize; | |
ef425673 | 1428 | int err; |
32a7627c | 1429 | |
301867b1 LN |
1430 | if (page >= bitmap->pages) { |
1431 | /* | |
1432 | * This can happen if bitmap_start_sync goes beyond | |
1433 | * End-of-device while looking for a whole page or | |
1434 | * user set a huge number to sysfs bitmap_set_bits. | |
1435 | */ | |
1436 | return NULL; | |
1437 | } | |
e64e4018 | 1438 | err = md_bitmap_checkpage(bitmap, page, create, 0); |
ef425673 N |
1439 | |
1440 | if (bitmap->bp[page].hijacked || | |
1441 | bitmap->bp[page].map == NULL) | |
61a0d80c | 1442 | csize = ((sector_t)1) << (bitmap->chunkshift + |
d837f727 | 1443 | PAGE_COUNTER_SHIFT); |
ef425673 | 1444 | else |
61a0d80c | 1445 | csize = ((sector_t)1) << bitmap->chunkshift; |
ef425673 N |
1446 | *blocks = csize - (offset & (csize - 1)); |
1447 | ||
1448 | if (err < 0) | |
32a7627c | 1449 | return NULL; |
ef425673 | 1450 | |
32a7627c N |
1451 | /* now locked ... */ |
1452 | ||
1453 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1454 | /* should we use the first or second counter field | |
1455 | * of the hijacked pointer? */ | |
1456 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
32a7627c N |
1457 | return &((bitmap_counter_t *) |
1458 | &bitmap->bp[page].map)[hi]; | |
ef425673 | 1459 | } else /* page is allocated */ |
32a7627c N |
1460 | return (bitmap_counter_t *) |
1461 | &(bitmap->bp[page].map[pageoff]); | |
32a7627c N |
1462 | } |
1463 | ||
e64e4018 | 1464 | int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c | 1465 | { |
ac2f40be N |
1466 | if (!bitmap) |
1467 | return 0; | |
4b6d287f N |
1468 | |
1469 | if (behind) { | |
696fcd53 | 1470 | int bw; |
4b6d287f | 1471 | atomic_inc(&bitmap->behind_writes); |
696fcd53 PC |
1472 | bw = atomic_read(&bitmap->behind_writes); |
1473 | if (bw > bitmap->behind_writes_used) | |
1474 | bitmap->behind_writes_used = bw; | |
1475 | ||
36a4e1fe N |
1476 | pr_debug("inc write-behind count %d/%lu\n", |
1477 | bw, bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1478 | } |
1479 | ||
32a7627c | 1480 | while (sectors) { |
57dab0bd | 1481 | sector_t blocks; |
32a7627c N |
1482 | bitmap_counter_t *bmc; |
1483 | ||
40cffcc0 | 1484 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 1485 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 1); |
32a7627c | 1486 | if (!bmc) { |
40cffcc0 | 1487 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1488 | return 0; |
1489 | } | |
1490 | ||
27d5ea04 | 1491 | if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { |
da6e1a32 NB |
1492 | DEFINE_WAIT(__wait); |
1493 | /* note that it is safe to do the prepare_to_wait | |
1494 | * after the test as long as we do it before dropping | |
1495 | * the spinlock. | |
1496 | */ | |
1497 | prepare_to_wait(&bitmap->overflow_wait, &__wait, | |
1498 | TASK_UNINTERRUPTIBLE); | |
40cffcc0 | 1499 | spin_unlock_irq(&bitmap->counts.lock); |
f54a9d0e | 1500 | schedule(); |
da6e1a32 NB |
1501 | finish_wait(&bitmap->overflow_wait, &__wait); |
1502 | continue; | |
1503 | } | |
1504 | ||
ac2f40be | 1505 | switch (*bmc) { |
32a7627c | 1506 | case 0: |
e64e4018 AS |
1507 | md_bitmap_file_set_bit(bitmap, offset); |
1508 | md_bitmap_count_page(&bitmap->counts, offset, 1); | |
df561f66 | 1509 | fallthrough; |
32a7627c N |
1510 | case 1: |
1511 | *bmc = 2; | |
1512 | } | |
da6e1a32 | 1513 | |
32a7627c N |
1514 | (*bmc)++; |
1515 | ||
40cffcc0 | 1516 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1517 | |
1518 | offset += blocks; | |
1519 | if (sectors > blocks) | |
1520 | sectors -= blocks; | |
ac2f40be N |
1521 | else |
1522 | sectors = 0; | |
32a7627c N |
1523 | } |
1524 | return 0; | |
1525 | } | |
e64e4018 | 1526 | EXPORT_SYMBOL(md_bitmap_startwrite); |
32a7627c | 1527 | |
e64e4018 AS |
1528 | void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset, |
1529 | unsigned long sectors, int success, int behind) | |
32a7627c | 1530 | { |
ac2f40be N |
1531 | if (!bitmap) |
1532 | return; | |
4b6d287f | 1533 | if (behind) { |
e555190d N |
1534 | if (atomic_dec_and_test(&bitmap->behind_writes)) |
1535 | wake_up(&bitmap->behind_wait); | |
36a4e1fe N |
1536 | pr_debug("dec write-behind count %d/%lu\n", |
1537 | atomic_read(&bitmap->behind_writes), | |
1538 | bitmap->mddev->bitmap_info.max_write_behind); | |
4b6d287f N |
1539 | } |
1540 | ||
32a7627c | 1541 | while (sectors) { |
57dab0bd | 1542 | sector_t blocks; |
32a7627c N |
1543 | unsigned long flags; |
1544 | bitmap_counter_t *bmc; | |
1545 | ||
40cffcc0 | 1546 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
e64e4018 | 1547 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 0); |
32a7627c | 1548 | if (!bmc) { |
40cffcc0 | 1549 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1550 | return; |
1551 | } | |
1552 | ||
961902c0 | 1553 | if (success && !bitmap->mddev->degraded && |
a0da84f3 NB |
1554 | bitmap->events_cleared < bitmap->mddev->events) { |
1555 | bitmap->events_cleared = bitmap->mddev->events; | |
1556 | bitmap->need_sync = 1; | |
5ff5afff | 1557 | sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); |
a0da84f3 NB |
1558 | } |
1559 | ||
27d5ea04 | 1560 | if (!success && !NEEDED(*bmc)) |
32a7627c N |
1561 | *bmc |= NEEDED_MASK; |
1562 | ||
27d5ea04 | 1563 | if (COUNTER(*bmc) == COUNTER_MAX) |
da6e1a32 NB |
1564 | wake_up(&bitmap->overflow_wait); |
1565 | ||
32a7627c | 1566 | (*bmc)--; |
2585f3ef | 1567 | if (*bmc <= 2) { |
e64e4018 | 1568 | md_bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1569 | bitmap->allclean = 0; |
1570 | } | |
40cffcc0 | 1571 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c N |
1572 | offset += blocks; |
1573 | if (sectors > blocks) | |
1574 | sectors -= blocks; | |
ac2f40be N |
1575 | else |
1576 | sectors = 0; | |
32a7627c N |
1577 | } |
1578 | } | |
e64e4018 | 1579 | EXPORT_SYMBOL(md_bitmap_endwrite); |
32a7627c | 1580 | |
57dab0bd | 1581 | static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1187cf0a | 1582 | int degraded) |
32a7627c N |
1583 | { |
1584 | bitmap_counter_t *bmc; | |
1585 | int rv; | |
1586 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1587 | *blocks = 1024; | |
1588 | return 1; /* always resync if no bitmap */ | |
1589 | } | |
40cffcc0 | 1590 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 1591 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0); |
32a7627c N |
1592 | rv = 0; |
1593 | if (bmc) { | |
1594 | /* locked */ | |
1595 | if (RESYNC(*bmc)) | |
1596 | rv = 1; | |
1597 | else if (NEEDED(*bmc)) { | |
1598 | rv = 1; | |
6a806c51 N |
1599 | if (!degraded) { /* don't set/clear bits if degraded */ |
1600 | *bmc |= RESYNC_MASK; | |
1601 | *bmc &= ~NEEDED_MASK; | |
1602 | } | |
32a7627c N |
1603 | } |
1604 | } | |
40cffcc0 | 1605 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1606 | return rv; |
1607 | } | |
1608 | ||
e64e4018 AS |
1609 | int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, |
1610 | int degraded) | |
1187cf0a N |
1611 | { |
1612 | /* bitmap_start_sync must always report on multiples of whole | |
1613 | * pages, otherwise resync (which is very PAGE_SIZE based) will | |
1614 | * get confused. | |
1615 | * So call __bitmap_start_sync repeatedly (if needed) until | |
1616 | * At least PAGE_SIZE>>9 blocks are covered. | |
1617 | * Return the 'or' of the result. | |
1618 | */ | |
1619 | int rv = 0; | |
57dab0bd | 1620 | sector_t blocks1; |
1187cf0a N |
1621 | |
1622 | *blocks = 0; | |
1623 | while (*blocks < (PAGE_SIZE>>9)) { | |
1624 | rv |= __bitmap_start_sync(bitmap, offset, | |
1625 | &blocks1, degraded); | |
1626 | offset += blocks1; | |
1627 | *blocks += blocks1; | |
1628 | } | |
1629 | return rv; | |
1630 | } | |
e64e4018 | 1631 | EXPORT_SYMBOL(md_bitmap_start_sync); |
1187cf0a | 1632 | |
e64e4018 | 1633 | void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) |
32a7627c N |
1634 | { |
1635 | bitmap_counter_t *bmc; | |
1636 | unsigned long flags; | |
ac2f40be N |
1637 | |
1638 | if (bitmap == NULL) { | |
32a7627c N |
1639 | *blocks = 1024; |
1640 | return; | |
1641 | } | |
40cffcc0 | 1642 | spin_lock_irqsave(&bitmap->counts.lock, flags); |
e64e4018 | 1643 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0); |
32a7627c N |
1644 | if (bmc == NULL) |
1645 | goto unlock; | |
1646 | /* locked */ | |
32a7627c N |
1647 | if (RESYNC(*bmc)) { |
1648 | *bmc &= ~RESYNC_MASK; | |
1649 | ||
1650 | if (!NEEDED(*bmc) && aborted) | |
1651 | *bmc |= NEEDED_MASK; | |
1652 | else { | |
2585f3ef | 1653 | if (*bmc <= 2) { |
e64e4018 | 1654 | md_bitmap_set_pending(&bitmap->counts, offset); |
2585f3ef N |
1655 | bitmap->allclean = 0; |
1656 | } | |
32a7627c N |
1657 | } |
1658 | } | |
1659 | unlock: | |
40cffcc0 | 1660 | spin_unlock_irqrestore(&bitmap->counts.lock, flags); |
32a7627c | 1661 | } |
e64e4018 | 1662 | EXPORT_SYMBOL(md_bitmap_end_sync); |
32a7627c | 1663 | |
e64e4018 | 1664 | void md_bitmap_close_sync(struct bitmap *bitmap) |
32a7627c N |
1665 | { |
1666 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1667 | * properly have been aborted. It remains to us to clear the | |
1668 | * RESYNC bit wherever it is still on | |
1669 | */ | |
1670 | sector_t sector = 0; | |
57dab0bd | 1671 | sector_t blocks; |
b47490c9 N |
1672 | if (!bitmap) |
1673 | return; | |
32a7627c | 1674 | while (sector < bitmap->mddev->resync_max_sectors) { |
e64e4018 | 1675 | md_bitmap_end_sync(bitmap, sector, &blocks, 0); |
b47490c9 N |
1676 | sector += blocks; |
1677 | } | |
1678 | } | |
e64e4018 | 1679 | EXPORT_SYMBOL(md_bitmap_close_sync); |
b47490c9 | 1680 | |
e64e4018 | 1681 | void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force) |
b47490c9 N |
1682 | { |
1683 | sector_t s = 0; | |
57dab0bd | 1684 | sector_t blocks; |
b47490c9 N |
1685 | |
1686 | if (!bitmap) | |
1687 | return; | |
1688 | if (sector == 0) { | |
1689 | bitmap->last_end_sync = jiffies; | |
1690 | return; | |
1691 | } | |
c40f341f | 1692 | if (!force && time_before(jiffies, (bitmap->last_end_sync |
1b04be96 | 1693 | + bitmap->mddev->bitmap_info.daemon_sleep))) |
b47490c9 N |
1694 | return; |
1695 | wait_event(bitmap->mddev->recovery_wait, | |
1696 | atomic_read(&bitmap->mddev->recovery_active) == 0); | |
1697 | ||
75d3da43 | 1698 | bitmap->mddev->curr_resync_completed = sector; |
2953079c | 1699 | set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags); |
40cffcc0 | 1700 | sector &= ~((1ULL << bitmap->counts.chunkshift) - 1); |
b47490c9 N |
1701 | s = 0; |
1702 | while (s < sector && s < bitmap->mddev->resync_max_sectors) { | |
e64e4018 | 1703 | md_bitmap_end_sync(bitmap, s, &blocks, 0); |
b47490c9 | 1704 | s += blocks; |
32a7627c | 1705 | } |
b47490c9 | 1706 | bitmap->last_end_sync = jiffies; |
e1a86dbb | 1707 | sysfs_notify_dirent_safe(bitmap->mddev->sysfs_completed); |
32a7627c | 1708 | } |
e64e4018 | 1709 | EXPORT_SYMBOL(md_bitmap_cond_end_sync); |
32a7627c | 1710 | |
e64e4018 | 1711 | void md_bitmap_sync_with_cluster(struct mddev *mddev, |
18c9ff7f GJ |
1712 | sector_t old_lo, sector_t old_hi, |
1713 | sector_t new_lo, sector_t new_hi) | |
1714 | { | |
1715 | struct bitmap *bitmap = mddev->bitmap; | |
1716 | sector_t sector, blocks = 0; | |
1717 | ||
1718 | for (sector = old_lo; sector < new_lo; ) { | |
e64e4018 | 1719 | md_bitmap_end_sync(bitmap, sector, &blocks, 0); |
18c9ff7f GJ |
1720 | sector += blocks; |
1721 | } | |
1722 | WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n"); | |
1723 | ||
1724 | for (sector = old_hi; sector < new_hi; ) { | |
e64e4018 | 1725 | md_bitmap_start_sync(bitmap, sector, &blocks, 0); |
18c9ff7f GJ |
1726 | sector += blocks; |
1727 | } | |
1728 | WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n"); | |
1729 | } | |
e64e4018 | 1730 | EXPORT_SYMBOL(md_bitmap_sync_with_cluster); |
18c9ff7f | 1731 | |
e64e4018 | 1732 | static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1733 | { |
1734 | /* For each chunk covered by any of these sectors, set the | |
ef99bf48 | 1735 | * counter to 2 and possibly set resync_needed. They should all |
32a7627c N |
1736 | * be 0 at this point |
1737 | */ | |
193f1c93 | 1738 | |
57dab0bd | 1739 | sector_t secs; |
193f1c93 | 1740 | bitmap_counter_t *bmc; |
40cffcc0 | 1741 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 1742 | bmc = md_bitmap_get_counter(&bitmap->counts, offset, &secs, 1); |
193f1c93 | 1743 | if (!bmc) { |
40cffcc0 | 1744 | spin_unlock_irq(&bitmap->counts.lock); |
193f1c93 | 1745 | return; |
32a7627c | 1746 | } |
ac2f40be | 1747 | if (!*bmc) { |
11dd35da | 1748 | *bmc = 2; |
e64e4018 AS |
1749 | md_bitmap_count_page(&bitmap->counts, offset, 1); |
1750 | md_bitmap_set_pending(&bitmap->counts, offset); | |
2585f3ef | 1751 | bitmap->allclean = 0; |
193f1c93 | 1752 | } |
11dd35da GR |
1753 | if (needed) |
1754 | *bmc |= NEEDED_MASK; | |
40cffcc0 | 1755 | spin_unlock_irq(&bitmap->counts.lock); |
32a7627c N |
1756 | } |
1757 | ||
9b1d1dac | 1758 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
e64e4018 | 1759 | void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) |
9b1d1dac PC |
1760 | { |
1761 | unsigned long chunk; | |
1762 | ||
1763 | for (chunk = s; chunk <= e; chunk++) { | |
40cffcc0 | 1764 | sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift; |
e64e4018 AS |
1765 | md_bitmap_set_memory_bits(bitmap, sec, 1); |
1766 | md_bitmap_file_set_bit(bitmap, sec); | |
ffa23322 N |
1767 | if (sec < bitmap->mddev->recovery_cp) |
1768 | /* We are asserting that the array is dirty, | |
1769 | * so move the recovery_cp address back so | |
1770 | * that it is obvious that it is dirty | |
1771 | */ | |
1772 | bitmap->mddev->recovery_cp = sec; | |
9b1d1dac PC |
1773 | } |
1774 | } | |
1775 | ||
6b8b3e8a N |
1776 | /* |
1777 | * flush out any pending updates | |
1778 | */ | |
e64e4018 | 1779 | void md_bitmap_flush(struct mddev *mddev) |
6b8b3e8a N |
1780 | { |
1781 | struct bitmap *bitmap = mddev->bitmap; | |
42a04b50 | 1782 | long sleep; |
6b8b3e8a N |
1783 | |
1784 | if (!bitmap) /* there was no bitmap */ | |
1785 | return; | |
1786 | ||
1787 | /* run the daemon_work three time to ensure everything is flushed | |
1788 | * that can be | |
1789 | */ | |
1b04be96 | 1790 | sleep = mddev->bitmap_info.daemon_sleep * 2; |
42a04b50 | 1791 | bitmap->daemon_lastrun -= sleep; |
e64e4018 | 1792 | md_bitmap_daemon_work(mddev); |
42a04b50 | 1793 | bitmap->daemon_lastrun -= sleep; |
e64e4018 | 1794 | md_bitmap_daemon_work(mddev); |
42a04b50 | 1795 | bitmap->daemon_lastrun -= sleep; |
e64e4018 | 1796 | md_bitmap_daemon_work(mddev); |
404a8ef5 SP |
1797 | if (mddev->bitmap_info.external) |
1798 | md_super_wait(mddev); | |
e64e4018 | 1799 | md_bitmap_update_sb(bitmap); |
6b8b3e8a N |
1800 | } |
1801 | ||
32a7627c N |
1802 | /* |
1803 | * free memory that was allocated | |
1804 | */ | |
e64e4018 | 1805 | void md_bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1806 | { |
1807 | unsigned long k, pages; | |
1808 | struct bitmap_page *bp; | |
32a7627c N |
1809 | |
1810 | if (!bitmap) /* there was no bitmap */ | |
1811 | return; | |
1812 | ||
f9a67b11 GJ |
1813 | if (bitmap->sysfs_can_clear) |
1814 | sysfs_put(bitmap->sysfs_can_clear); | |
1815 | ||
f9209a32 GR |
1816 | if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info && |
1817 | bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev)) | |
b97e9257 GR |
1818 | md_cluster_stop(bitmap->mddev); |
1819 | ||
fae7d326 N |
1820 | /* Shouldn't be needed - but just in case.... */ |
1821 | wait_event(bitmap->write_wait, | |
1822 | atomic_read(&bitmap->pending_writes) == 0); | |
1823 | ||
1824 | /* release the bitmap file */ | |
e64e4018 | 1825 | md_bitmap_file_unmap(&bitmap->storage); |
32a7627c | 1826 | |
40cffcc0 N |
1827 | bp = bitmap->counts.bp; |
1828 | pages = bitmap->counts.pages; | |
32a7627c N |
1829 | |
1830 | /* free all allocated memory */ | |
1831 | ||
32a7627c N |
1832 | if (bp) /* deallocate the page memory */ |
1833 | for (k = 0; k < pages; k++) | |
1834 | if (bp[k].map && !bp[k].hijacked) | |
1835 | kfree(bp[k].map); | |
1836 | kfree(bp); | |
1837 | kfree(bitmap); | |
1838 | } | |
e64e4018 | 1839 | EXPORT_SYMBOL(md_bitmap_free); |
aa5cbd10 | 1840 | |
e64e4018 | 1841 | void md_bitmap_wait_behind_writes(struct mddev *mddev) |
48df498d GJ |
1842 | { |
1843 | struct bitmap *bitmap = mddev->bitmap; | |
1844 | ||
1845 | /* wait for behind writes to complete */ | |
1846 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
1847 | pr_debug("md:%s: behind writes in progress - waiting to stop.\n", | |
1848 | mdname(mddev)); | |
1849 | /* need to kick something here to make sure I/O goes? */ | |
1850 | wait_event(bitmap->behind_wait, | |
1851 | atomic_read(&bitmap->behind_writes) == 0); | |
1852 | } | |
1853 | } | |
1854 | ||
e64e4018 | 1855 | void md_bitmap_destroy(struct mddev *mddev) |
3178b0db N |
1856 | { |
1857 | struct bitmap *bitmap = mddev->bitmap; | |
1858 | ||
1859 | if (!bitmap) /* there was no bitmap */ | |
1860 | return; | |
1861 | ||
e64e4018 | 1862 | md_bitmap_wait_behind_writes(mddev); |
69b00b5b | 1863 | if (!mddev->serialize_policy) |
b4128c00 | 1864 | mddev_destroy_serial_pool(mddev, NULL); |
48df498d | 1865 | |
c3d9714e | 1866 | mutex_lock(&mddev->bitmap_info.mutex); |
978a7a47 | 1867 | spin_lock(&mddev->lock); |
3178b0db | 1868 | mddev->bitmap = NULL; /* disconnect from the md device */ |
978a7a47 | 1869 | spin_unlock(&mddev->lock); |
c3d9714e | 1870 | mutex_unlock(&mddev->bitmap_info.mutex); |
4eeb6535 | 1871 | mddev_set_timeout(mddev, MAX_SCHEDULE_TIMEOUT, true); |
3178b0db | 1872 | |
e64e4018 | 1873 | md_bitmap_free(bitmap); |
3178b0db | 1874 | } |
32a7627c N |
1875 | |
1876 | /* | |
1877 | * initialize the bitmap structure | |
1878 | * if this returns an error, bitmap_destroy must be called to do clean up | |
f9a67b11 | 1879 | * once mddev->bitmap is set |
32a7627c | 1880 | */ |
e64e4018 | 1881 | struct bitmap *md_bitmap_create(struct mddev *mddev, int slot) |
32a7627c N |
1882 | { |
1883 | struct bitmap *bitmap; | |
1f593903 | 1884 | sector_t blocks = mddev->resync_max_sectors; |
c3d9714e | 1885 | struct file *file = mddev->bitmap_info.file; |
32a7627c | 1886 | int err; |
324a56e1 | 1887 | struct kernfs_node *bm = NULL; |
32a7627c | 1888 | |
5f6e3c83 | 1889 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
32a7627c | 1890 | |
c3d9714e | 1891 | BUG_ON(file && mddev->bitmap_info.offset); |
a654b9d8 | 1892 | |
230b55fa N |
1893 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
1894 | pr_notice("md/raid:%s: array with journal cannot have bitmap\n", | |
1895 | mdname(mddev)); | |
1896 | return ERR_PTR(-EBUSY); | |
1897 | } | |
1898 | ||
9ffae0cf | 1899 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c | 1900 | if (!bitmap) |
f9209a32 | 1901 | return ERR_PTR(-ENOMEM); |
32a7627c | 1902 | |
40cffcc0 | 1903 | spin_lock_init(&bitmap->counts.lock); |
ce25c31b N |
1904 | atomic_set(&bitmap->pending_writes, 0); |
1905 | init_waitqueue_head(&bitmap->write_wait); | |
da6e1a32 | 1906 | init_waitqueue_head(&bitmap->overflow_wait); |
e555190d | 1907 | init_waitqueue_head(&bitmap->behind_wait); |
ce25c31b | 1908 | |
32a7627c | 1909 | bitmap->mddev = mddev; |
f9209a32 | 1910 | bitmap->cluster_slot = slot; |
32a7627c | 1911 | |
5ff5afff | 1912 | if (mddev->kobj.sd) |
388975cc | 1913 | bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap"); |
ece5cff0 | 1914 | if (bm) { |
388975cc | 1915 | bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear"); |
ece5cff0 N |
1916 | sysfs_put(bm); |
1917 | } else | |
1918 | bitmap->sysfs_can_clear = NULL; | |
1919 | ||
1ec885cd | 1920 | bitmap->storage.file = file; |
ce25c31b N |
1921 | if (file) { |
1922 | get_file(file); | |
ae8fa283 N |
1923 | /* As future accesses to this file will use bmap, |
1924 | * and bypass the page cache, we must sync the file | |
1925 | * first. | |
1926 | */ | |
8018ab05 | 1927 | vfs_fsync(file, 1); |
ce25c31b | 1928 | } |
42a04b50 | 1929 | /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ |
9c81075f JB |
1930 | if (!mddev->bitmap_info.external) { |
1931 | /* | |
1932 | * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is | |
1933 | * instructing us to create a new on-disk bitmap instance. | |
1934 | */ | |
1935 | if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) | |
e64e4018 | 1936 | err = md_bitmap_new_disk_sb(bitmap); |
9c81075f | 1937 | else |
e64e4018 | 1938 | err = md_bitmap_read_sb(bitmap); |
9c81075f | 1939 | } else { |
ece5cff0 N |
1940 | err = 0; |
1941 | if (mddev->bitmap_info.chunksize == 0 || | |
1942 | mddev->bitmap_info.daemon_sleep == 0) | |
1943 | /* chunksize and time_base need to be | |
1944 | * set first. */ | |
1945 | err = -EINVAL; | |
1946 | } | |
32a7627c | 1947 | if (err) |
3178b0db | 1948 | goto error; |
32a7627c | 1949 | |
624ce4f5 | 1950 | bitmap->daemon_lastrun = jiffies; |
e64e4018 | 1951 | err = md_bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1); |
d60b479d | 1952 | if (err) |
3178b0db | 1953 | goto error; |
32a7627c | 1954 | |
ec0cc226 N |
1955 | pr_debug("created bitmap (%lu pages) for device %s\n", |
1956 | bitmap->counts.pages, bmname(bitmap)); | |
69e51b44 | 1957 | |
f9209a32 GR |
1958 | err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0; |
1959 | if (err) | |
1960 | goto error; | |
69e51b44 | 1961 | |
f9209a32 | 1962 | return bitmap; |
69e51b44 | 1963 | error: |
e64e4018 | 1964 | md_bitmap_free(bitmap); |
f9209a32 | 1965 | return ERR_PTR(err); |
69e51b44 N |
1966 | } |
1967 | ||
e64e4018 | 1968 | int md_bitmap_load(struct mddev *mddev) |
69e51b44 N |
1969 | { |
1970 | int err = 0; | |
3520fa4d | 1971 | sector_t start = 0; |
69e51b44 N |
1972 | sector_t sector = 0; |
1973 | struct bitmap *bitmap = mddev->bitmap; | |
617b194a | 1974 | struct md_rdev *rdev; |
69e51b44 N |
1975 | |
1976 | if (!bitmap) | |
1977 | goto out; | |
1978 | ||
617b194a | 1979 | rdev_for_each(rdev, mddev) |
b4128c00 | 1980 | mddev_create_serial_pool(mddev, rdev); |
617b194a | 1981 | |
51e453ae GJ |
1982 | if (mddev_is_clustered(mddev)) |
1983 | md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes); | |
1984 | ||
69e51b44 N |
1985 | /* Clear out old bitmap info first: Either there is none, or we |
1986 | * are resuming after someone else has possibly changed things, | |
1987 | * so we should forget old cached info. | |
1988 | * All chunks should be clean, but some might need_sync. | |
1989 | */ | |
1990 | while (sector < mddev->resync_max_sectors) { | |
57dab0bd | 1991 | sector_t blocks; |
e64e4018 | 1992 | md_bitmap_start_sync(bitmap, sector, &blocks, 0); |
69e51b44 N |
1993 | sector += blocks; |
1994 | } | |
e64e4018 | 1995 | md_bitmap_close_sync(bitmap); |
69e51b44 | 1996 | |
3520fa4d JB |
1997 | if (mddev->degraded == 0 |
1998 | || bitmap->events_cleared == mddev->events) | |
1999 | /* no need to keep dirty bits to optimise a | |
2000 | * re-add of a missing device */ | |
2001 | start = mddev->recovery_cp; | |
2002 | ||
afbaa90b | 2003 | mutex_lock(&mddev->bitmap_info.mutex); |
e64e4018 | 2004 | err = md_bitmap_init_from_disk(bitmap, start); |
afbaa90b | 2005 | mutex_unlock(&mddev->bitmap_info.mutex); |
3520fa4d | 2006 | |
32a7627c | 2007 | if (err) |
69e51b44 | 2008 | goto out; |
b405fe91 | 2009 | clear_bit(BITMAP_STALE, &bitmap->flags); |
ef99bf48 N |
2010 | |
2011 | /* Kick recovery in case any bits were set */ | |
2012 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
3178b0db | 2013 | |
4eeb6535 | 2014 | mddev_set_timeout(mddev, mddev->bitmap_info.daemon_sleep, true); |
9cd30fdc | 2015 | md_wakeup_thread(mddev->thread); |
b15c2e57 | 2016 | |
e64e4018 | 2017 | md_bitmap_update_sb(bitmap); |
4ad13663 | 2018 | |
b405fe91 | 2019 | if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) |
69e51b44 N |
2020 | err = -EIO; |
2021 | out: | |
3178b0db | 2022 | return err; |
32a7627c | 2023 | } |
e64e4018 | 2024 | EXPORT_SYMBOL_GPL(md_bitmap_load); |
32a7627c | 2025 | |
1383b347 | 2026 | /* caller need to free returned bitmap with md_bitmap_free() */ |
b98938d1 GJ |
2027 | struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot) |
2028 | { | |
2029 | int rv = 0; | |
2030 | struct bitmap *bitmap; | |
2031 | ||
e64e4018 | 2032 | bitmap = md_bitmap_create(mddev, slot); |
b98938d1 GJ |
2033 | if (IS_ERR(bitmap)) { |
2034 | rv = PTR_ERR(bitmap); | |
2035 | return ERR_PTR(rv); | |
2036 | } | |
2037 | ||
e64e4018 | 2038 | rv = md_bitmap_init_from_disk(bitmap, 0); |
b98938d1 | 2039 | if (rv) { |
e64e4018 | 2040 | md_bitmap_free(bitmap); |
b98938d1 GJ |
2041 | return ERR_PTR(rv); |
2042 | } | |
2043 | ||
2044 | return bitmap; | |
2045 | } | |
2046 | EXPORT_SYMBOL(get_bitmap_from_slot); | |
2047 | ||
11dd35da GR |
2048 | /* Loads the bitmap associated with slot and copies the resync information |
2049 | * to our bitmap | |
2050 | */ | |
e64e4018 | 2051 | int md_bitmap_copy_from_slot(struct mddev *mddev, int slot, |
97f6cd39 | 2052 | sector_t *low, sector_t *high, bool clear_bits) |
11dd35da GR |
2053 | { |
2054 | int rv = 0, i, j; | |
2055 | sector_t block, lo = 0, hi = 0; | |
2056 | struct bitmap_counts *counts; | |
b98938d1 | 2057 | struct bitmap *bitmap; |
11dd35da | 2058 | |
b98938d1 GJ |
2059 | bitmap = get_bitmap_from_slot(mddev, slot); |
2060 | if (IS_ERR(bitmap)) { | |
2061 | pr_err("%s can't get bitmap from slot %d\n", __func__, slot); | |
2062 | return -1; | |
2063 | } | |
11dd35da GR |
2064 | |
2065 | counts = &bitmap->counts; | |
2066 | for (j = 0; j < counts->chunks; j++) { | |
2067 | block = (sector_t)j << counts->chunkshift; | |
e64e4018 | 2068 | if (md_bitmap_file_test_bit(bitmap, block)) { |
11dd35da GR |
2069 | if (!lo) |
2070 | lo = block; | |
2071 | hi = block; | |
e64e4018 AS |
2072 | md_bitmap_file_clear_bit(bitmap, block); |
2073 | md_bitmap_set_memory_bits(mddev->bitmap, block, 1); | |
2074 | md_bitmap_file_set_bit(mddev->bitmap, block); | |
11dd35da GR |
2075 | } |
2076 | } | |
2077 | ||
97f6cd39 | 2078 | if (clear_bits) { |
e64e4018 | 2079 | md_bitmap_update_sb(bitmap); |
c84400c8 GJ |
2080 | /* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs |
2081 | * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */ | |
97f6cd39 | 2082 | for (i = 0; i < bitmap->storage.file_pages; i++) |
c84400c8 GJ |
2083 | if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING)) |
2084 | set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); | |
e64e4018 | 2085 | md_bitmap_unplug(bitmap); |
97f6cd39 | 2086 | } |
e64e4018 | 2087 | md_bitmap_unplug(mddev->bitmap); |
11dd35da GR |
2088 | *low = lo; |
2089 | *high = hi; | |
1383b347 | 2090 | md_bitmap_free(bitmap); |
b98938d1 | 2091 | |
11dd35da GR |
2092 | return rv; |
2093 | } | |
e64e4018 | 2094 | EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot); |
11dd35da GR |
2095 | |
2096 | ||
e64e4018 | 2097 | void md_bitmap_status(struct seq_file *seq, struct bitmap *bitmap) |
57148964 N |
2098 | { |
2099 | unsigned long chunk_kb; | |
40cffcc0 | 2100 | struct bitmap_counts *counts; |
57148964 N |
2101 | |
2102 | if (!bitmap) | |
2103 | return; | |
2104 | ||
40cffcc0 N |
2105 | counts = &bitmap->counts; |
2106 | ||
57148964 N |
2107 | chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; |
2108 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
2109 | "%lu%s chunk", | |
40cffcc0 N |
2110 | counts->pages - counts->missing_pages, |
2111 | counts->pages, | |
2112 | (counts->pages - counts->missing_pages) | |
57148964 N |
2113 | << (PAGE_SHIFT - 10), |
2114 | chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, | |
2115 | chunk_kb ? "KB" : "B"); | |
1ec885cd | 2116 | if (bitmap->storage.file) { |
57148964 | 2117 | seq_printf(seq, ", file: "); |
2726d566 | 2118 | seq_file_path(seq, bitmap->storage.file, " \t\n"); |
57148964 N |
2119 | } |
2120 | ||
2121 | seq_printf(seq, "\n"); | |
57148964 N |
2122 | } |
2123 | ||
e64e4018 | 2124 | int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks, |
d60b479d N |
2125 | int chunksize, int init) |
2126 | { | |
2127 | /* If chunk_size is 0, choose an appropriate chunk size. | |
2128 | * Then possibly allocate new storage space. | |
2129 | * Then quiesce, copy bits, replace bitmap, and re-start | |
2130 | * | |
2131 | * This function is called both to set up the initial bitmap | |
2132 | * and to resize the bitmap while the array is active. | |
2133 | * If this happens as a result of the array being resized, | |
2134 | * chunksize will be zero, and we need to choose a suitable | |
2135 | * chunksize, otherwise we use what we are given. | |
2136 | */ | |
2137 | struct bitmap_storage store; | |
2138 | struct bitmap_counts old_counts; | |
2139 | unsigned long chunks; | |
2140 | sector_t block; | |
2141 | sector_t old_blocks, new_blocks; | |
2142 | int chunkshift; | |
2143 | int ret = 0; | |
2144 | long pages; | |
2145 | struct bitmap_page *new_bp; | |
2146 | ||
e8a27f83 N |
2147 | if (bitmap->storage.file && !init) { |
2148 | pr_info("md: cannot resize file-based bitmap\n"); | |
2149 | return -EINVAL; | |
2150 | } | |
2151 | ||
d60b479d N |
2152 | if (chunksize == 0) { |
2153 | /* If there is enough space, leave the chunk size unchanged, | |
2154 | * else increase by factor of two until there is enough space. | |
2155 | */ | |
2156 | long bytes; | |
2157 | long space = bitmap->mddev->bitmap_info.space; | |
2158 | ||
2159 | if (space == 0) { | |
2160 | /* We don't know how much space there is, so limit | |
2161 | * to current size - in sectors. | |
2162 | */ | |
2163 | bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8); | |
2164 | if (!bitmap->mddev->bitmap_info.external) | |
2165 | bytes += sizeof(bitmap_super_t); | |
2166 | space = DIV_ROUND_UP(bytes, 512); | |
2167 | bitmap->mddev->bitmap_info.space = space; | |
2168 | } | |
2169 | chunkshift = bitmap->counts.chunkshift; | |
2170 | chunkshift--; | |
2171 | do { | |
2172 | /* 'chunkshift' is shift from block size to chunk size */ | |
2173 | chunkshift++; | |
2174 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
2175 | bytes = DIV_ROUND_UP(chunks, 8); | |
2176 | if (!bitmap->mddev->bitmap_info.external) | |
2177 | bytes += sizeof(bitmap_super_t); | |
45552111 FEM |
2178 | } while (bytes > (space << 9) && (chunkshift + BITMAP_BLOCK_SHIFT) < |
2179 | (BITS_PER_BYTE * sizeof(((bitmap_super_t *)0)->chunksize) - 1)); | |
d60b479d N |
2180 | } else |
2181 | chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT; | |
2182 | ||
2183 | chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); | |
2184 | memset(&store, 0, sizeof(store)); | |
2185 | if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file) | |
e64e4018 AS |
2186 | ret = md_bitmap_storage_alloc(&store, chunks, |
2187 | !bitmap->mddev->bitmap_info.external, | |
2188 | mddev_is_clustered(bitmap->mddev) | |
2189 | ? bitmap->cluster_slot : 0); | |
cbb38732 | 2190 | if (ret) { |
e64e4018 | 2191 | md_bitmap_file_unmap(&store); |
d60b479d | 2192 | goto err; |
cbb38732 | 2193 | } |
d60b479d N |
2194 | |
2195 | pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO); | |
2196 | ||
6396bb22 | 2197 | new_bp = kcalloc(pages, sizeof(*new_bp), GFP_KERNEL); |
d60b479d N |
2198 | ret = -ENOMEM; |
2199 | if (!new_bp) { | |
e64e4018 | 2200 | md_bitmap_file_unmap(&store); |
d60b479d N |
2201 | goto err; |
2202 | } | |
2203 | ||
2204 | if (!init) | |
2205 | bitmap->mddev->pers->quiesce(bitmap->mddev, 1); | |
2206 | ||
2207 | store.file = bitmap->storage.file; | |
2208 | bitmap->storage.file = NULL; | |
2209 | ||
2210 | if (store.sb_page && bitmap->storage.sb_page) | |
2211 | memcpy(page_address(store.sb_page), | |
2212 | page_address(bitmap->storage.sb_page), | |
938b533d | 2213 | sizeof(bitmap_super_t)); |
fadcbd29 | 2214 | spin_lock_irq(&bitmap->counts.lock); |
e64e4018 | 2215 | md_bitmap_file_unmap(&bitmap->storage); |
d60b479d N |
2216 | bitmap->storage = store; |
2217 | ||
2218 | old_counts = bitmap->counts; | |
2219 | bitmap->counts.bp = new_bp; | |
2220 | bitmap->counts.pages = pages; | |
2221 | bitmap->counts.missing_pages = pages; | |
2222 | bitmap->counts.chunkshift = chunkshift; | |
2223 | bitmap->counts.chunks = chunks; | |
45552111 | 2224 | bitmap->mddev->bitmap_info.chunksize = 1UL << (chunkshift + |
d60b479d N |
2225 | BITMAP_BLOCK_SHIFT); |
2226 | ||
2227 | blocks = min(old_counts.chunks << old_counts.chunkshift, | |
2228 | chunks << chunkshift); | |
2229 | ||
c9d65032 GJ |
2230 | /* For cluster raid, need to pre-allocate bitmap */ |
2231 | if (mddev_is_clustered(bitmap->mddev)) { | |
2232 | unsigned long page; | |
2233 | for (page = 0; page < pages; page++) { | |
e64e4018 | 2234 | ret = md_bitmap_checkpage(&bitmap->counts, page, 1, 1); |
c9d65032 GJ |
2235 | if (ret) { |
2236 | unsigned long k; | |
2237 | ||
2238 | /* deallocate the page memory */ | |
2239 | for (k = 0; k < page; k++) { | |
bc47e842 | 2240 | kfree(new_bp[k].map); |
c9d65032 | 2241 | } |
0868b99c | 2242 | kfree(new_bp); |
c9d65032 GJ |
2243 | |
2244 | /* restore some fields from old_counts */ | |
2245 | bitmap->counts.bp = old_counts.bp; | |
2246 | bitmap->counts.pages = old_counts.pages; | |
2247 | bitmap->counts.missing_pages = old_counts.pages; | |
2248 | bitmap->counts.chunkshift = old_counts.chunkshift; | |
2249 | bitmap->counts.chunks = old_counts.chunks; | |
45552111 FEM |
2250 | bitmap->mddev->bitmap_info.chunksize = |
2251 | 1UL << (old_counts.chunkshift + BITMAP_BLOCK_SHIFT); | |
c9d65032 | 2252 | blocks = old_counts.chunks << old_counts.chunkshift; |
ec0cc226 | 2253 | pr_warn("Could not pre-allocate in-memory bitmap for cluster raid\n"); |
c9d65032 GJ |
2254 | break; |
2255 | } else | |
2256 | bitmap->counts.bp[page].count += 1; | |
2257 | } | |
2258 | } | |
2259 | ||
d60b479d N |
2260 | for (block = 0; block < blocks; ) { |
2261 | bitmap_counter_t *bmc_old, *bmc_new; | |
2262 | int set; | |
2263 | ||
e64e4018 | 2264 | bmc_old = md_bitmap_get_counter(&old_counts, block, &old_blocks, 0); |
d60b479d N |
2265 | set = bmc_old && NEEDED(*bmc_old); |
2266 | ||
2267 | if (set) { | |
e64e4018 | 2268 | bmc_new = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1); |
3bd548e5 LZ |
2269 | if (bmc_new) { |
2270 | if (*bmc_new == 0) { | |
2271 | /* need to set on-disk bits too. */ | |
2272 | sector_t end = block + new_blocks; | |
2273 | sector_t start = block >> chunkshift; | |
2274 | ||
2275 | start <<= chunkshift; | |
2276 | while (start < end) { | |
2277 | md_bitmap_file_set_bit(bitmap, block); | |
2278 | start += 1 << chunkshift; | |
2279 | } | |
2280 | *bmc_new = 2; | |
2281 | md_bitmap_count_page(&bitmap->counts, block, 1); | |
2282 | md_bitmap_set_pending(&bitmap->counts, block); | |
d60b479d | 2283 | } |
3bd548e5 | 2284 | *bmc_new |= NEEDED_MASK; |
d60b479d | 2285 | } |
d60b479d N |
2286 | if (new_blocks < old_blocks) |
2287 | old_blocks = new_blocks; | |
2288 | } | |
2289 | block += old_blocks; | |
2290 | } | |
2291 | ||
0868b99c ZK |
2292 | if (bitmap->counts.bp != old_counts.bp) { |
2293 | unsigned long k; | |
2294 | for (k = 0; k < old_counts.pages; k++) | |
2295 | if (!old_counts.bp[k].hijacked) | |
2296 | kfree(old_counts.bp[k].map); | |
2297 | kfree(old_counts.bp); | |
2298 | } | |
2299 | ||
d60b479d N |
2300 | if (!init) { |
2301 | int i; | |
2302 | while (block < (chunks << chunkshift)) { | |
2303 | bitmap_counter_t *bmc; | |
e64e4018 | 2304 | bmc = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1); |
d60b479d N |
2305 | if (bmc) { |
2306 | /* new space. It needs to be resynced, so | |
2307 | * we set NEEDED_MASK. | |
2308 | */ | |
2309 | if (*bmc == 0) { | |
2310 | *bmc = NEEDED_MASK | 2; | |
e64e4018 AS |
2311 | md_bitmap_count_page(&bitmap->counts, block, 1); |
2312 | md_bitmap_set_pending(&bitmap->counts, block); | |
d60b479d N |
2313 | } |
2314 | } | |
2315 | block += new_blocks; | |
2316 | } | |
2317 | for (i = 0; i < bitmap->storage.file_pages; i++) | |
2318 | set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); | |
2319 | } | |
2320 | spin_unlock_irq(&bitmap->counts.lock); | |
2321 | ||
2322 | if (!init) { | |
e64e4018 | 2323 | md_bitmap_unplug(bitmap); |
d60b479d N |
2324 | bitmap->mddev->pers->quiesce(bitmap->mddev, 0); |
2325 | } | |
2326 | ret = 0; | |
2327 | err: | |
2328 | return ret; | |
2329 | } | |
e64e4018 | 2330 | EXPORT_SYMBOL_GPL(md_bitmap_resize); |
d60b479d | 2331 | |
43a70507 | 2332 | static ssize_t |
fd01b88c | 2333 | location_show(struct mddev *mddev, char *page) |
43a70507 N |
2334 | { |
2335 | ssize_t len; | |
ac2f40be | 2336 | if (mddev->bitmap_info.file) |
43a70507 | 2337 | len = sprintf(page, "file"); |
ac2f40be | 2338 | else if (mddev->bitmap_info.offset) |
43a70507 | 2339 | len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); |
ac2f40be | 2340 | else |
43a70507 N |
2341 | len = sprintf(page, "none"); |
2342 | len += sprintf(page+len, "\n"); | |
2343 | return len; | |
2344 | } | |
2345 | ||
2346 | static ssize_t | |
fd01b88c | 2347 | location_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 | 2348 | { |
d9dd26b2 | 2349 | int rv; |
43a70507 | 2350 | |
3cddf86a | 2351 | rv = mddev_suspend_and_lock(mddev); |
d9dd26b2 SL |
2352 | if (rv) |
2353 | return rv; | |
158d32af | 2354 | |
43a70507 | 2355 | if (mddev->pers) { |
d9dd26b2 SL |
2356 | if (mddev->recovery || mddev->sync_thread) { |
2357 | rv = -EBUSY; | |
2358 | goto out; | |
2359 | } | |
43a70507 N |
2360 | } |
2361 | ||
2362 | if (mddev->bitmap || mddev->bitmap_info.file || | |
2363 | mddev->bitmap_info.offset) { | |
2364 | /* bitmap already configured. Only option is to clear it */ | |
d9dd26b2 SL |
2365 | if (strncmp(buf, "none", 4) != 0) { |
2366 | rv = -EBUSY; | |
2367 | goto out; | |
2368 | } | |
158d32af YK |
2369 | |
2370 | md_bitmap_destroy(mddev); | |
43a70507 N |
2371 | mddev->bitmap_info.offset = 0; |
2372 | if (mddev->bitmap_info.file) { | |
2373 | struct file *f = mddev->bitmap_info.file; | |
2374 | mddev->bitmap_info.file = NULL; | |
43a70507 N |
2375 | fput(f); |
2376 | } | |
2377 | } else { | |
2378 | /* No bitmap, OK to set a location */ | |
2379 | long long offset; | |
158d32af YK |
2380 | struct bitmap *bitmap; |
2381 | ||
43a70507 N |
2382 | if (strncmp(buf, "none", 4) == 0) |
2383 | /* nothing to be done */; | |
2384 | else if (strncmp(buf, "file:", 5) == 0) { | |
2385 | /* Not supported yet */ | |
d9dd26b2 SL |
2386 | rv = -EINVAL; |
2387 | goto out; | |
43a70507 | 2388 | } else { |
43a70507 | 2389 | if (buf[0] == '+') |
b29bebd6 | 2390 | rv = kstrtoll(buf+1, 10, &offset); |
43a70507 | 2391 | else |
b29bebd6 | 2392 | rv = kstrtoll(buf, 10, &offset); |
43a70507 | 2393 | if (rv) |
d9dd26b2 SL |
2394 | goto out; |
2395 | if (offset == 0) { | |
2396 | rv = -EINVAL; | |
2397 | goto out; | |
2398 | } | |
ece5cff0 N |
2399 | if (mddev->bitmap_info.external == 0 && |
2400 | mddev->major_version == 0 && | |
d9dd26b2 SL |
2401 | offset != mddev->bitmap_info.default_offset) { |
2402 | rv = -EINVAL; | |
2403 | goto out; | |
2404 | } | |
158d32af | 2405 | |
43a70507 | 2406 | mddev->bitmap_info.offset = offset; |
158d32af YK |
2407 | bitmap = md_bitmap_create(mddev, -1); |
2408 | if (IS_ERR(bitmap)) { | |
2409 | rv = PTR_ERR(bitmap); | |
2410 | goto out; | |
2411 | } | |
2412 | ||
2413 | mddev->bitmap = bitmap; | |
2414 | rv = md_bitmap_load(mddev); | |
2415 | if (rv) { | |
2416 | mddev->bitmap_info.offset = 0; | |
2417 | md_bitmap_destroy(mddev); | |
2418 | goto out; | |
43a70507 N |
2419 | } |
2420 | } | |
2421 | } | |
2422 | if (!mddev->external) { | |
2423 | /* Ensure new bitmap info is stored in | |
2424 | * metadata promptly. | |
2425 | */ | |
2953079c | 2426 | set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); |
43a70507 N |
2427 | md_wakeup_thread(mddev->thread); |
2428 | } | |
d9dd26b2 SL |
2429 | rv = 0; |
2430 | out: | |
3cddf86a | 2431 | mddev_unlock_and_resume(mddev); |
d9dd26b2 SL |
2432 | if (rv) |
2433 | return rv; | |
43a70507 N |
2434 | return len; |
2435 | } | |
2436 | ||
2437 | static struct md_sysfs_entry bitmap_location = | |
2438 | __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); | |
2439 | ||
6409bb05 N |
2440 | /* 'bitmap/space' is the space available at 'location' for the |
2441 | * bitmap. This allows the kernel to know when it is safe to | |
2442 | * resize the bitmap to match a resized array. | |
2443 | */ | |
2444 | static ssize_t | |
2445 | space_show(struct mddev *mddev, char *page) | |
2446 | { | |
2447 | return sprintf(page, "%lu\n", mddev->bitmap_info.space); | |
2448 | } | |
2449 | ||
2450 | static ssize_t | |
2451 | space_store(struct mddev *mddev, const char *buf, size_t len) | |
2452 | { | |
2453 | unsigned long sectors; | |
2454 | int rv; | |
2455 | ||
2456 | rv = kstrtoul(buf, 10, §ors); | |
2457 | if (rv) | |
2458 | return rv; | |
2459 | ||
2460 | if (sectors == 0) | |
2461 | return -EINVAL; | |
2462 | ||
2463 | if (mddev->bitmap && | |
9b1215c1 | 2464 | sectors < (mddev->bitmap->storage.bytes + 511) >> 9) |
6409bb05 N |
2465 | return -EFBIG; /* Bitmap is too big for this small space */ |
2466 | ||
2467 | /* could make sure it isn't too big, but that isn't really | |
2468 | * needed - user-space should be careful. | |
2469 | */ | |
2470 | mddev->bitmap_info.space = sectors; | |
2471 | return len; | |
2472 | } | |
2473 | ||
2474 | static struct md_sysfs_entry bitmap_space = | |
2475 | __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); | |
2476 | ||
43a70507 | 2477 | static ssize_t |
fd01b88c | 2478 | timeout_show(struct mddev *mddev, char *page) |
43a70507 N |
2479 | { |
2480 | ssize_t len; | |
2481 | unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; | |
2482 | unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; | |
ac2f40be | 2483 | |
43a70507 N |
2484 | len = sprintf(page, "%lu", secs); |
2485 | if (jifs) | |
2486 | len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); | |
2487 | len += sprintf(page+len, "\n"); | |
2488 | return len; | |
2489 | } | |
2490 | ||
2491 | static ssize_t | |
fd01b88c | 2492 | timeout_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2493 | { |
2494 | /* timeout can be set at any time */ | |
2495 | unsigned long timeout; | |
2496 | int rv = strict_strtoul_scaled(buf, &timeout, 4); | |
2497 | if (rv) | |
2498 | return rv; | |
2499 | ||
2500 | /* just to make sure we don't overflow... */ | |
2501 | if (timeout >= LONG_MAX / HZ) | |
2502 | return -EINVAL; | |
2503 | ||
2504 | timeout = timeout * HZ / 10000; | |
2505 | ||
2506 | if (timeout >= MAX_SCHEDULE_TIMEOUT) | |
2507 | timeout = MAX_SCHEDULE_TIMEOUT-1; | |
2508 | if (timeout < 1) | |
2509 | timeout = 1; | |
c333673a | 2510 | |
4eeb6535 YK |
2511 | mddev->bitmap_info.daemon_sleep = timeout; |
2512 | mddev_set_timeout(mddev, timeout, false); | |
c333673a | 2513 | md_wakeup_thread(mddev->thread); |
4eeb6535 | 2514 | |
43a70507 N |
2515 | return len; |
2516 | } | |
2517 | ||
2518 | static struct md_sysfs_entry bitmap_timeout = | |
2519 | __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); | |
2520 | ||
2521 | static ssize_t | |
fd01b88c | 2522 | backlog_show(struct mddev *mddev, char *page) |
43a70507 N |
2523 | { |
2524 | return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); | |
2525 | } | |
2526 | ||
2527 | static ssize_t | |
fd01b88c | 2528 | backlog_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2529 | { |
2530 | unsigned long backlog; | |
10c92fca | 2531 | unsigned long old_mwb = mddev->bitmap_info.max_write_behind; |
8c13ab11 GJ |
2532 | struct md_rdev *rdev; |
2533 | bool has_write_mostly = false; | |
b29bebd6 | 2534 | int rv = kstrtoul(buf, 10, &backlog); |
43a70507 N |
2535 | if (rv) |
2536 | return rv; | |
2537 | if (backlog > COUNTER_MAX) | |
2538 | return -EINVAL; | |
8c13ab11 | 2539 | |
58226942 | 2540 | rv = mddev_suspend_and_lock(mddev); |
44abfa6a YK |
2541 | if (rv) |
2542 | return rv; | |
2543 | ||
8c13ab11 GJ |
2544 | /* |
2545 | * Without write mostly device, it doesn't make sense to set | |
2546 | * backlog for max_write_behind. | |
2547 | */ | |
2548 | rdev_for_each(rdev, mddev) { | |
2549 | if (test_bit(WriteMostly, &rdev->flags)) { | |
2550 | has_write_mostly = true; | |
2551 | break; | |
2552 | } | |
2553 | } | |
2554 | if (!has_write_mostly) { | |
2555 | pr_warn_ratelimited("%s: can't set backlog, no write mostly device available\n", | |
2556 | mdname(mddev)); | |
44abfa6a | 2557 | mddev_unlock(mddev); |
8c13ab11 GJ |
2558 | return -EINVAL; |
2559 | } | |
2560 | ||
43a70507 | 2561 | mddev->bitmap_info.max_write_behind = backlog; |
404659cf GJ |
2562 | if (!backlog && mddev->serial_info_pool) { |
2563 | /* serial_info_pool is not needed if backlog is zero */ | |
69b00b5b | 2564 | if (!mddev->serialize_policy) |
b4128c00 | 2565 | mddev_destroy_serial_pool(mddev, NULL); |
404659cf GJ |
2566 | } else if (backlog && !mddev->serial_info_pool) { |
2567 | /* serial_info_pool is needed since backlog is not zero */ | |
10c92fca | 2568 | rdev_for_each(rdev, mddev) |
b4128c00 | 2569 | mddev_create_serial_pool(mddev, rdev); |
10c92fca GJ |
2570 | } |
2571 | if (old_mwb != backlog) | |
2572 | md_bitmap_update_sb(mddev->bitmap); | |
44abfa6a | 2573 | |
58226942 | 2574 | mddev_unlock_and_resume(mddev); |
43a70507 N |
2575 | return len; |
2576 | } | |
2577 | ||
2578 | static struct md_sysfs_entry bitmap_backlog = | |
2579 | __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); | |
2580 | ||
2581 | static ssize_t | |
fd01b88c | 2582 | chunksize_show(struct mddev *mddev, char *page) |
43a70507 N |
2583 | { |
2584 | return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); | |
2585 | } | |
2586 | ||
2587 | static ssize_t | |
fd01b88c | 2588 | chunksize_store(struct mddev *mddev, const char *buf, size_t len) |
43a70507 N |
2589 | { |
2590 | /* Can only be changed when no bitmap is active */ | |
2591 | int rv; | |
2592 | unsigned long csize; | |
2593 | if (mddev->bitmap) | |
2594 | return -EBUSY; | |
b29bebd6 | 2595 | rv = kstrtoul(buf, 10, &csize); |
43a70507 N |
2596 | if (rv) |
2597 | return rv; | |
2598 | if (csize < 512 || | |
2599 | !is_power_of_2(csize)) | |
2600 | return -EINVAL; | |
45552111 FEM |
2601 | if (BITS_PER_LONG > 32 && csize >= (1ULL << (BITS_PER_BYTE * |
2602 | sizeof(((bitmap_super_t *)0)->chunksize)))) | |
2603 | return -EOVERFLOW; | |
43a70507 N |
2604 | mddev->bitmap_info.chunksize = csize; |
2605 | return len; | |
2606 | } | |
2607 | ||
2608 | static struct md_sysfs_entry bitmap_chunksize = | |
2609 | __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); | |
2610 | ||
fd01b88c | 2611 | static ssize_t metadata_show(struct mddev *mddev, char *page) |
ece5cff0 | 2612 | { |
c4ce867f GR |
2613 | if (mddev_is_clustered(mddev)) |
2614 | return sprintf(page, "clustered\n"); | |
ece5cff0 N |
2615 | return sprintf(page, "%s\n", (mddev->bitmap_info.external |
2616 | ? "external" : "internal")); | |
2617 | } | |
2618 | ||
fd01b88c | 2619 | static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2620 | { |
2621 | if (mddev->bitmap || | |
2622 | mddev->bitmap_info.file || | |
2623 | mddev->bitmap_info.offset) | |
2624 | return -EBUSY; | |
2625 | if (strncmp(buf, "external", 8) == 0) | |
2626 | mddev->bitmap_info.external = 1; | |
c4ce867f GR |
2627 | else if ((strncmp(buf, "internal", 8) == 0) || |
2628 | (strncmp(buf, "clustered", 9) == 0)) | |
ece5cff0 N |
2629 | mddev->bitmap_info.external = 0; |
2630 | else | |
2631 | return -EINVAL; | |
2632 | return len; | |
2633 | } | |
2634 | ||
2635 | static struct md_sysfs_entry bitmap_metadata = | |
2636 | __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); | |
2637 | ||
fd01b88c | 2638 | static ssize_t can_clear_show(struct mddev *mddev, char *page) |
ece5cff0 N |
2639 | { |
2640 | int len; | |
b7b17c9b | 2641 | spin_lock(&mddev->lock); |
ece5cff0 N |
2642 | if (mddev->bitmap) |
2643 | len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? | |
2644 | "false" : "true")); | |
2645 | else | |
2646 | len = sprintf(page, "\n"); | |
b7b17c9b | 2647 | spin_unlock(&mddev->lock); |
ece5cff0 N |
2648 | return len; |
2649 | } | |
2650 | ||
fd01b88c | 2651 | static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) |
ece5cff0 N |
2652 | { |
2653 | if (mddev->bitmap == NULL) | |
2654 | return -ENOENT; | |
2655 | if (strncmp(buf, "false", 5) == 0) | |
2656 | mddev->bitmap->need_sync = 1; | |
2657 | else if (strncmp(buf, "true", 4) == 0) { | |
2658 | if (mddev->degraded) | |
2659 | return -EBUSY; | |
2660 | mddev->bitmap->need_sync = 0; | |
2661 | } else | |
2662 | return -EINVAL; | |
2663 | return len; | |
2664 | } | |
2665 | ||
2666 | static struct md_sysfs_entry bitmap_can_clear = | |
2667 | __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); | |
2668 | ||
696fcd53 | 2669 | static ssize_t |
fd01b88c | 2670 | behind_writes_used_show(struct mddev *mddev, char *page) |
696fcd53 | 2671 | { |
b7b17c9b N |
2672 | ssize_t ret; |
2673 | spin_lock(&mddev->lock); | |
696fcd53 | 2674 | if (mddev->bitmap == NULL) |
b7b17c9b N |
2675 | ret = sprintf(page, "0\n"); |
2676 | else | |
2677 | ret = sprintf(page, "%lu\n", | |
2678 | mddev->bitmap->behind_writes_used); | |
2679 | spin_unlock(&mddev->lock); | |
2680 | return ret; | |
696fcd53 PC |
2681 | } |
2682 | ||
2683 | static ssize_t | |
fd01b88c | 2684 | behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) |
696fcd53 PC |
2685 | { |
2686 | if (mddev->bitmap) | |
2687 | mddev->bitmap->behind_writes_used = 0; | |
2688 | return len; | |
2689 | } | |
2690 | ||
2691 | static struct md_sysfs_entry max_backlog_used = | |
2692 | __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, | |
2693 | behind_writes_used_show, behind_writes_used_reset); | |
2694 | ||
43a70507 N |
2695 | static struct attribute *md_bitmap_attrs[] = { |
2696 | &bitmap_location.attr, | |
6409bb05 | 2697 | &bitmap_space.attr, |
43a70507 N |
2698 | &bitmap_timeout.attr, |
2699 | &bitmap_backlog.attr, | |
2700 | &bitmap_chunksize.attr, | |
ece5cff0 N |
2701 | &bitmap_metadata.attr, |
2702 | &bitmap_can_clear.attr, | |
696fcd53 | 2703 | &max_backlog_used.attr, |
43a70507 N |
2704 | NULL |
2705 | }; | |
c32dc040 | 2706 | const struct attribute_group md_bitmap_group = { |
43a70507 N |
2707 | .name = "bitmap", |
2708 | .attrs = md_bitmap_attrs, | |
2709 | }; |