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Commit | Line | Data |
---|---|---|
32a7627c N |
1 | /* |
2 | * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 | |
3 | * | |
4 | * bitmap_create - sets up the bitmap structure | |
5 | * bitmap_destroy - destroys the bitmap structure | |
6 | * | |
7 | * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: | |
8 | * - added disk storage for bitmap | |
9 | * - changes to allow various bitmap chunk sizes | |
32a7627c N |
10 | */ |
11 | ||
12 | /* | |
13 | * Still to do: | |
14 | * | |
15 | * flush after percent set rather than just time based. (maybe both). | |
16 | * wait if count gets too high, wake when it drops to half. | |
32a7627c N |
17 | */ |
18 | ||
19 | #include <linux/module.h> | |
32a7627c N |
20 | #include <linux/errno.h> |
21 | #include <linux/slab.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/config.h> | |
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> | |
30 | #include <linux/raid/md.h> | |
31 | #include <linux/raid/bitmap.h> | |
32 | ||
33 | /* debug macros */ | |
34 | ||
35 | #define DEBUG 0 | |
36 | ||
37 | #if DEBUG | |
38 | /* these are for debugging purposes only! */ | |
39 | ||
40 | /* define one and only one of these */ | |
41 | #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */ | |
42 | #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/ | |
43 | #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */ | |
44 | #define INJECT_FAULTS_4 0 /* undef */ | |
45 | #define INJECT_FAULTS_5 0 /* undef */ | |
46 | #define INJECT_FAULTS_6 0 | |
47 | ||
48 | /* if these are defined, the driver will fail! debug only */ | |
49 | #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */ | |
50 | #define INJECT_FATAL_FAULT_2 0 /* undef */ | |
51 | #define INJECT_FATAL_FAULT_3 0 /* undef */ | |
52 | #endif | |
53 | ||
54 | //#define DPRINTK PRINTK /* set this NULL to avoid verbose debug output */ | |
55 | #define DPRINTK(x...) do { } while(0) | |
56 | ||
57 | #ifndef PRINTK | |
58 | # if DEBUG > 0 | |
59 | # define PRINTK(x...) printk(KERN_DEBUG x) | |
60 | # else | |
61 | # define PRINTK(x...) | |
62 | # endif | |
63 | #endif | |
64 | ||
65 | static inline char * bmname(struct bitmap *bitmap) | |
66 | { | |
67 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; | |
68 | } | |
69 | ||
32a7627c N |
70 | |
71 | /* | |
72 | * just a placeholder - calls kmalloc for bitmap pages | |
73 | */ | |
74 | static unsigned char *bitmap_alloc_page(struct bitmap *bitmap) | |
75 | { | |
76 | unsigned char *page; | |
77 | ||
44456d37 | 78 | #ifdef INJECT_FAULTS_1 |
32a7627c N |
79 | page = NULL; |
80 | #else | |
81 | page = kmalloc(PAGE_SIZE, GFP_NOIO); | |
82 | #endif | |
83 | if (!page) | |
84 | printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap)); | |
85 | else | |
a654b9d8 | 86 | PRINTK("%s: bitmap_alloc_page: allocated page at %p\n", |
32a7627c N |
87 | bmname(bitmap), page); |
88 | return page; | |
89 | } | |
90 | ||
91 | /* | |
92 | * for now just a placeholder -- just calls kfree for bitmap pages | |
93 | */ | |
94 | static void bitmap_free_page(struct bitmap *bitmap, unsigned char *page) | |
95 | { | |
96 | PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap), page); | |
97 | kfree(page); | |
98 | } | |
99 | ||
100 | /* | |
101 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) | |
102 | * | |
103 | * 1) check to see if this page is allocated, if it's not then try to alloc | |
104 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the | |
105 | * page pointer directly as a counter | |
106 | * | |
107 | * if we find our page, we increment the page's refcount so that it stays | |
108 | * allocated while we're using it | |
109 | */ | |
110 | static int bitmap_checkpage(struct bitmap *bitmap, unsigned long page, int create) | |
111 | { | |
112 | unsigned char *mappage; | |
113 | ||
114 | if (page >= bitmap->pages) { | |
115 | printk(KERN_ALERT | |
116 | "%s: invalid bitmap page request: %lu (> %lu)\n", | |
117 | bmname(bitmap), page, bitmap->pages-1); | |
118 | return -EINVAL; | |
119 | } | |
120 | ||
121 | ||
122 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ | |
123 | return 0; | |
124 | ||
125 | if (bitmap->bp[page].map) /* page is already allocated, just return */ | |
126 | return 0; | |
127 | ||
128 | if (!create) | |
129 | return -ENOENT; | |
130 | ||
131 | spin_unlock_irq(&bitmap->lock); | |
132 | ||
133 | /* this page has not been allocated yet */ | |
134 | ||
135 | if ((mappage = bitmap_alloc_page(bitmap)) == NULL) { | |
136 | PRINTK("%s: bitmap map page allocation failed, hijacking\n", | |
137 | bmname(bitmap)); | |
138 | /* failed - set the hijacked flag so that we can use the | |
139 | * pointer as a counter */ | |
140 | spin_lock_irq(&bitmap->lock); | |
141 | if (!bitmap->bp[page].map) | |
142 | bitmap->bp[page].hijacked = 1; | |
143 | goto out; | |
144 | } | |
145 | ||
146 | /* got a page */ | |
147 | ||
148 | spin_lock_irq(&bitmap->lock); | |
149 | ||
150 | /* recheck the page */ | |
151 | ||
152 | if (bitmap->bp[page].map || bitmap->bp[page].hijacked) { | |
153 | /* somebody beat us to getting the page */ | |
154 | bitmap_free_page(bitmap, mappage); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* no page was in place and we have one, so install it */ | |
159 | ||
160 | memset(mappage, 0, PAGE_SIZE); | |
161 | bitmap->bp[page].map = mappage; | |
162 | bitmap->missing_pages--; | |
163 | out: | |
164 | return 0; | |
165 | } | |
166 | ||
167 | ||
168 | /* if page is completely empty, put it back on the free list, or dealloc it */ | |
169 | /* if page was hijacked, unmark the flag so it might get alloced next time */ | |
170 | /* Note: lock should be held when calling this */ | |
858119e1 | 171 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
32a7627c N |
172 | { |
173 | char *ptr; | |
174 | ||
175 | if (bitmap->bp[page].count) /* page is still busy */ | |
176 | return; | |
177 | ||
178 | /* page is no longer in use, it can be released */ | |
179 | ||
180 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ | |
181 | bitmap->bp[page].hijacked = 0; | |
182 | bitmap->bp[page].map = NULL; | |
183 | return; | |
184 | } | |
185 | ||
186 | /* normal case, free the page */ | |
187 | ||
188 | #if 0 | |
189 | /* actually ... let's not. We will probably need the page again exactly when | |
190 | * memory is tight and we are flusing to disk | |
191 | */ | |
192 | return; | |
193 | #else | |
194 | ptr = bitmap->bp[page].map; | |
195 | bitmap->bp[page].map = NULL; | |
196 | bitmap->missing_pages++; | |
197 | bitmap_free_page(bitmap, ptr); | |
198 | return; | |
199 | #endif | |
200 | } | |
201 | ||
202 | ||
203 | /* | |
204 | * bitmap file handling - read and write the bitmap file and its superblock | |
205 | */ | |
206 | ||
207 | /* copy the pathname of a file to a buffer */ | |
208 | char *file_path(struct file *file, char *buf, int count) | |
209 | { | |
210 | struct dentry *d; | |
211 | struct vfsmount *v; | |
212 | ||
213 | if (!buf) | |
214 | return NULL; | |
215 | ||
216 | d = file->f_dentry; | |
217 | v = file->f_vfsmnt; | |
218 | ||
219 | buf = d_path(d, v, buf, count); | |
220 | ||
221 | return IS_ERR(buf) ? NULL : buf; | |
222 | } | |
223 | ||
224 | /* | |
225 | * basic page I/O operations | |
226 | */ | |
227 | ||
a654b9d8 N |
228 | /* IO operations when bitmap is stored near all superblocks */ |
229 | static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long index) | |
230 | { | |
231 | /* choose a good rdev and read the page from there */ | |
232 | ||
233 | mdk_rdev_t *rdev; | |
234 | struct list_head *tmp; | |
235 | struct page *page = alloc_page(GFP_KERNEL); | |
236 | sector_t target; | |
237 | ||
238 | if (!page) | |
239 | return ERR_PTR(-ENOMEM); | |
a654b9d8 | 240 | |
ab904d63 | 241 | ITERATE_RDEV(mddev, rdev, tmp) { |
b2d444d7 N |
242 | if (! test_bit(In_sync, &rdev->flags) |
243 | || test_bit(Faulty, &rdev->flags)) | |
ab904d63 N |
244 | continue; |
245 | ||
a654b9d8 N |
246 | target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512); |
247 | ||
ab904d63 N |
248 | if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) { |
249 | page->index = index; | |
250 | return page; | |
251 | } | |
252 | } | |
253 | return ERR_PTR(-EIO); | |
a654b9d8 | 254 | |
a654b9d8 N |
255 | } |
256 | ||
257 | static int write_sb_page(mddev_t *mddev, long offset, struct page *page, int wait) | |
258 | { | |
259 | mdk_rdev_t *rdev; | |
260 | struct list_head *tmp; | |
261 | ||
262 | ITERATE_RDEV(mddev, rdev, tmp) | |
b2d444d7 N |
263 | if (test_bit(In_sync, &rdev->flags) |
264 | && !test_bit(Faulty, &rdev->flags)) | |
a654b9d8 N |
265 | md_super_write(mddev, rdev, |
266 | (rdev->sb_offset<<1) + offset | |
267 | + page->index * (PAGE_SIZE/512), | |
268 | PAGE_SIZE, | |
269 | page); | |
270 | ||
271 | if (wait) | |
a9701a30 | 272 | md_super_wait(mddev); |
a654b9d8 N |
273 | return 0; |
274 | } | |
275 | ||
32a7627c | 276 | /* |
a654b9d8 | 277 | * write out a page to a file |
32a7627c | 278 | */ |
77ad4bc7 | 279 | static int write_page(struct bitmap *bitmap, struct page *page, int wait) |
32a7627c | 280 | { |
d785a06a | 281 | struct buffer_head *bh; |
32a7627c | 282 | |
a654b9d8 N |
283 | if (bitmap->file == NULL) |
284 | return write_sb_page(bitmap->mddev, bitmap->offset, page, wait); | |
285 | ||
d785a06a | 286 | bh = page_buffers(page); |
c708443c | 287 | |
d785a06a N |
288 | while (bh && bh->b_blocknr) { |
289 | atomic_inc(&bitmap->pending_writes); | |
290 | set_buffer_locked(bh); | |
291 | set_buffer_mapped(bh); | |
292 | submit_bh(WRITE, bh); | |
293 | bh = bh->b_this_page; | |
294 | } | |
295 | ||
296 | if (wait) { | |
297 | wait_event(bitmap->write_wait, | |
298 | atomic_read(&bitmap->pending_writes)==0); | |
299 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; | |
8a5e9cf1 | 300 | } |
d785a06a N |
301 | return 0; |
302 | } | |
303 | ||
304 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) | |
305 | { | |
306 | struct bitmap *bitmap = bh->b_private; | |
307 | unsigned long flags; | |
32a7627c | 308 | |
d785a06a N |
309 | if (!uptodate) { |
310 | spin_lock_irqsave(&bitmap->lock, flags); | |
311 | bitmap->flags |= BITMAP_WRITE_ERROR; | |
312 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
32a7627c | 313 | } |
d785a06a N |
314 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
315 | wake_up(&bitmap->write_wait); | |
316 | } | |
32a7627c | 317 | |
d785a06a N |
318 | /* copied from buffer.c */ |
319 | static void | |
320 | __clear_page_buffers(struct page *page) | |
321 | { | |
322 | ClearPagePrivate(page); | |
323 | set_page_private(page, 0); | |
324 | page_cache_release(page); | |
325 | } | |
326 | static void free_buffers(struct page *page) | |
327 | { | |
328 | struct buffer_head *bh = page_buffers(page); | |
77ad4bc7 | 329 | |
d785a06a N |
330 | while (bh) { |
331 | struct buffer_head *next = bh->b_this_page; | |
332 | free_buffer_head(bh); | |
333 | bh = next; | |
77ad4bc7 | 334 | } |
d785a06a N |
335 | __clear_page_buffers(page); |
336 | put_page(page); | |
32a7627c N |
337 | } |
338 | ||
d785a06a N |
339 | /* read a page from a file. |
340 | * We both read the page, and attach buffers to the page to record the | |
341 | * address of each block (using bmap). These addresses will be used | |
342 | * to write the block later, completely bypassing the filesystem. | |
343 | * This usage is similar to how swap files are handled, and allows us | |
344 | * to write to a file with no concerns of memory allocation failing. | |
345 | */ | |
32a7627c | 346 | static struct page *read_page(struct file *file, unsigned long index, |
d785a06a N |
347 | struct bitmap *bitmap, |
348 | unsigned long count) | |
32a7627c | 349 | { |
32a7627c | 350 | struct page *page = NULL; |
d785a06a N |
351 | struct inode *inode = file->f_dentry->d_inode; |
352 | loff_t pos = index << PAGE_SHIFT; | |
353 | int ret; | |
354 | struct buffer_head *bh; | |
355 | sector_t block; | |
356 | mm_segment_t oldfs; | |
32a7627c | 357 | |
2d1f3b5d N |
358 | PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_SIZE, |
359 | (unsigned long long)index << PAGE_SHIFT); | |
32a7627c | 360 | |
d785a06a N |
361 | page = alloc_page(GFP_KERNEL); |
362 | if (!page) | |
363 | page = ERR_PTR(-ENOMEM); | |
32a7627c N |
364 | if (IS_ERR(page)) |
365 | goto out; | |
d785a06a N |
366 | |
367 | oldfs = get_fs(); | |
368 | set_fs(KERNEL_DS); | |
369 | ret = vfs_read(file, (char __user*) page_address(page), count, &pos); | |
370 | set_fs(oldfs); | |
371 | ||
372 | if (ret >= 0 && ret != count) | |
373 | ret = -EIO; | |
374 | if (ret < 0) { | |
375 | put_page(page); | |
376 | page = ERR_PTR(ret); | |
377 | goto out; | |
378 | } | |
379 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); | |
380 | if (!bh) { | |
2d1f3b5d | 381 | put_page(page); |
d785a06a | 382 | page = ERR_PTR(-ENOMEM); |
32a7627c N |
383 | goto out; |
384 | } | |
d785a06a N |
385 | attach_page_buffers(page, bh); |
386 | block = index << (PAGE_SHIFT - inode->i_blkbits); | |
387 | while (bh) { | |
388 | if (count == 0) | |
389 | bh->b_blocknr = 0; | |
390 | else { | |
391 | bh->b_blocknr = bmap(inode, block); | |
392 | if (bh->b_blocknr == 0) { | |
393 | /* Cannot use this file! */ | |
394 | free_buffers(page); | |
395 | page = ERR_PTR(-EINVAL); | |
396 | goto out; | |
397 | } | |
398 | bh->b_bdev = inode->i_sb->s_bdev; | |
399 | if (count < (1<<inode->i_blkbits)) | |
400 | count = 0; | |
401 | else | |
402 | count -= (1<<inode->i_blkbits); | |
403 | ||
404 | bh->b_end_io = end_bitmap_write; | |
405 | bh->b_private = bitmap; | |
406 | } | |
407 | block++; | |
408 | bh = bh->b_this_page; | |
409 | } | |
32a7627c | 410 | |
d785a06a | 411 | page->index = index; |
32a7627c N |
412 | out: |
413 | if (IS_ERR(page)) | |
414 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %Lu): %ld\n", | |
2d1f3b5d N |
415 | (int)PAGE_SIZE, |
416 | (unsigned long long)index << PAGE_SHIFT, | |
32a7627c N |
417 | PTR_ERR(page)); |
418 | return page; | |
419 | } | |
420 | ||
421 | /* | |
422 | * bitmap file superblock operations | |
423 | */ | |
424 | ||
425 | /* update the event counter and sync the superblock to disk */ | |
426 | int bitmap_update_sb(struct bitmap *bitmap) | |
427 | { | |
428 | bitmap_super_t *sb; | |
429 | unsigned long flags; | |
430 | ||
431 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ | |
432 | return 0; | |
433 | spin_lock_irqsave(&bitmap->lock, flags); | |
434 | if (!bitmap->sb_page) { /* no superblock */ | |
435 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
436 | return 0; | |
437 | } | |
32a7627c | 438 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ea03aff9 | 439 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c N |
440 | sb->events = cpu_to_le64(bitmap->mddev->events); |
441 | if (!bitmap->mddev->degraded) | |
442 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); | |
ea03aff9 | 443 | kunmap_atomic(sb, KM_USER0); |
8a5e9cf1 | 444 | return write_page(bitmap, bitmap->sb_page, 1); |
32a7627c N |
445 | } |
446 | ||
447 | /* print out the bitmap file superblock */ | |
448 | void bitmap_print_sb(struct bitmap *bitmap) | |
449 | { | |
450 | bitmap_super_t *sb; | |
451 | ||
452 | if (!bitmap || !bitmap->sb_page) | |
453 | return; | |
ea03aff9 | 454 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 455 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
a2cff26a N |
456 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
457 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); | |
458 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", | |
32a7627c N |
459 | *(__u32 *)(sb->uuid+0), |
460 | *(__u32 *)(sb->uuid+4), | |
461 | *(__u32 *)(sb->uuid+8), | |
462 | *(__u32 *)(sb->uuid+12)); | |
a2cff26a | 463 | printk(KERN_DEBUG " events: %llu\n", |
32a7627c | 464 | (unsigned long long) le64_to_cpu(sb->events)); |
a2cff26a | 465 | printk(KERN_DEBUG "events cleared: %llu\n", |
32a7627c | 466 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
a2cff26a N |
467 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
468 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); | |
469 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); | |
470 | printk(KERN_DEBUG " sync size: %llu KB\n", | |
471 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); | |
4b6d287f | 472 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
ea03aff9 | 473 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
474 | } |
475 | ||
476 | /* read the superblock from the bitmap file and initialize some bitmap fields */ | |
477 | static int bitmap_read_sb(struct bitmap *bitmap) | |
478 | { | |
479 | char *reason = NULL; | |
480 | bitmap_super_t *sb; | |
4b6d287f | 481 | unsigned long chunksize, daemon_sleep, write_behind; |
32a7627c N |
482 | unsigned long long events; |
483 | int err = -EINVAL; | |
484 | ||
485 | /* page 0 is the superblock, read it... */ | |
a654b9d8 | 486 | if (bitmap->file) |
d785a06a | 487 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, PAGE_SIZE); |
a654b9d8 N |
488 | else { |
489 | bitmap->sb_page = read_sb_page(bitmap->mddev, bitmap->offset, 0); | |
a654b9d8 | 490 | } |
32a7627c N |
491 | if (IS_ERR(bitmap->sb_page)) { |
492 | err = PTR_ERR(bitmap->sb_page); | |
493 | bitmap->sb_page = NULL; | |
494 | return err; | |
495 | } | |
496 | ||
ea03aff9 | 497 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c | 498 | |
32a7627c N |
499 | chunksize = le32_to_cpu(sb->chunksize); |
500 | daemon_sleep = le32_to_cpu(sb->daemon_sleep); | |
4b6d287f | 501 | write_behind = le32_to_cpu(sb->write_behind); |
32a7627c N |
502 | |
503 | /* verify that the bitmap-specific fields are valid */ | |
504 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) | |
505 | reason = "bad magic"; | |
bd926c63 N |
506 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
507 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) | |
32a7627c | 508 | reason = "unrecognized superblock version"; |
7dd5d34c N |
509 | else if (chunksize < PAGE_SIZE) |
510 | reason = "bitmap chunksize too small"; | |
32a7627c N |
511 | else if ((1 << ffz(~chunksize)) != chunksize) |
512 | reason = "bitmap chunksize not a power of 2"; | |
7dd5d34c N |
513 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT / HZ) |
514 | reason = "daemon sleep period out of range"; | |
4b6d287f N |
515 | else if (write_behind > COUNTER_MAX) |
516 | reason = "write-behind limit out of range (0 - 16383)"; | |
32a7627c N |
517 | if (reason) { |
518 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", | |
519 | bmname(bitmap), reason); | |
520 | goto out; | |
521 | } | |
522 | ||
523 | /* keep the array size field of the bitmap superblock up to date */ | |
524 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); | |
525 | ||
526 | if (!bitmap->mddev->persistent) | |
527 | goto success; | |
528 | ||
529 | /* | |
530 | * if we have a persistent array superblock, compare the | |
531 | * bitmap's UUID and event counter to the mddev's | |
532 | */ | |
533 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { | |
534 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", | |
535 | bmname(bitmap)); | |
536 | goto out; | |
537 | } | |
538 | events = le64_to_cpu(sb->events); | |
539 | if (events < bitmap->mddev->events) { | |
540 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " | |
541 | "-- forcing full recovery\n", bmname(bitmap), events, | |
542 | (unsigned long long) bitmap->mddev->events); | |
543 | sb->state |= BITMAP_STALE; | |
544 | } | |
545 | success: | |
546 | /* assign fields using values from superblock */ | |
547 | bitmap->chunksize = chunksize; | |
548 | bitmap->daemon_sleep = daemon_sleep; | |
585f0dd5 | 549 | bitmap->daemon_lastrun = jiffies; |
4b6d287f | 550 | bitmap->max_write_behind = write_behind; |
32a7627c | 551 | bitmap->flags |= sb->state; |
bd926c63 N |
552 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
553 | bitmap->flags |= BITMAP_HOSTENDIAN; | |
32a7627c | 554 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
6a07997f N |
555 | if (sb->state & BITMAP_STALE) |
556 | bitmap->events_cleared = bitmap->mddev->events; | |
32a7627c N |
557 | err = 0; |
558 | out: | |
ea03aff9 | 559 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
560 | if (err) |
561 | bitmap_print_sb(bitmap); | |
562 | return err; | |
563 | } | |
564 | ||
565 | enum bitmap_mask_op { | |
566 | MASK_SET, | |
567 | MASK_UNSET | |
568 | }; | |
569 | ||
570 | /* record the state of the bitmap in the superblock */ | |
571 | static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, | |
572 | enum bitmap_mask_op op) | |
573 | { | |
574 | bitmap_super_t *sb; | |
575 | unsigned long flags; | |
576 | ||
577 | spin_lock_irqsave(&bitmap->lock, flags); | |
7e317655 | 578 | if (!bitmap->sb_page) { /* can't set the state */ |
32a7627c N |
579 | spin_unlock_irqrestore(&bitmap->lock, flags); |
580 | return; | |
581 | } | |
32a7627c | 582 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ea03aff9 | 583 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
32a7627c N |
584 | switch (op) { |
585 | case MASK_SET: sb->state |= bits; | |
586 | break; | |
587 | case MASK_UNSET: sb->state &= ~bits; | |
588 | break; | |
589 | default: BUG(); | |
590 | } | |
ea03aff9 | 591 | kunmap_atomic(sb, KM_USER0); |
32a7627c N |
592 | } |
593 | ||
594 | /* | |
595 | * general bitmap file operations | |
596 | */ | |
597 | ||
598 | /* calculate the index of the page that contains this bit */ | |
599 | static inline unsigned long file_page_index(unsigned long chunk) | |
600 | { | |
601 | return CHUNK_BIT_OFFSET(chunk) >> PAGE_BIT_SHIFT; | |
602 | } | |
603 | ||
604 | /* calculate the (bit) offset of this bit within a page */ | |
605 | static inline unsigned long file_page_offset(unsigned long chunk) | |
606 | { | |
607 | return CHUNK_BIT_OFFSET(chunk) & (PAGE_BITS - 1); | |
608 | } | |
609 | ||
610 | /* | |
611 | * return a pointer to the page in the filemap that contains the given bit | |
612 | * | |
613 | * this lookup is complicated by the fact that the bitmap sb might be exactly | |
614 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page | |
615 | * 0 or page 1 | |
616 | */ | |
617 | static inline struct page *filemap_get_page(struct bitmap *bitmap, | |
618 | unsigned long chunk) | |
619 | { | |
620 | return bitmap->filemap[file_page_index(chunk) - file_page_index(0)]; | |
621 | } | |
622 | ||
623 | ||
624 | static void bitmap_file_unmap(struct bitmap *bitmap) | |
625 | { | |
626 | struct page **map, *sb_page; | |
627 | unsigned long *attr; | |
628 | int pages; | |
629 | unsigned long flags; | |
630 | ||
631 | spin_lock_irqsave(&bitmap->lock, flags); | |
632 | map = bitmap->filemap; | |
633 | bitmap->filemap = NULL; | |
634 | attr = bitmap->filemap_attr; | |
635 | bitmap->filemap_attr = NULL; | |
636 | pages = bitmap->file_pages; | |
637 | bitmap->file_pages = 0; | |
638 | sb_page = bitmap->sb_page; | |
639 | bitmap->sb_page = NULL; | |
640 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
641 | ||
642 | while (pages--) | |
643 | if (map[pages]->index != 0) /* 0 is sb_page, release it below */ | |
d785a06a | 644 | free_buffers(map[pages]); |
32a7627c N |
645 | kfree(map); |
646 | kfree(attr); | |
647 | ||
d785a06a N |
648 | if (sb_page) |
649 | free_buffers(sb_page); | |
32a7627c N |
650 | } |
651 | ||
652 | static void bitmap_file_put(struct bitmap *bitmap) | |
653 | { | |
654 | struct file *file; | |
32a7627c N |
655 | unsigned long flags; |
656 | ||
657 | spin_lock_irqsave(&bitmap->lock, flags); | |
658 | file = bitmap->file; | |
659 | bitmap->file = NULL; | |
660 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
661 | ||
d785a06a N |
662 | if (file) |
663 | wait_event(bitmap->write_wait, | |
664 | atomic_read(&bitmap->pending_writes)==0); | |
32a7627c N |
665 | bitmap_file_unmap(bitmap); |
666 | ||
d785a06a N |
667 | if (file) { |
668 | struct inode *inode = file->f_dentry->d_inode; | |
669 | invalidate_inode_pages(inode->i_mapping); | |
32a7627c | 670 | fput(file); |
d785a06a | 671 | } |
32a7627c N |
672 | } |
673 | ||
674 | ||
675 | /* | |
676 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file | |
677 | * then it is no longer reliable, so we stop using it and we mark the file | |
678 | * as failed in the superblock | |
679 | */ | |
680 | static void bitmap_file_kick(struct bitmap *bitmap) | |
681 | { | |
682 | char *path, *ptr = NULL; | |
683 | ||
684 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET); | |
685 | bitmap_update_sb(bitmap); | |
686 | ||
a654b9d8 N |
687 | if (bitmap->file) { |
688 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
689 | if (path) | |
690 | ptr = file_path(bitmap->file, path, PAGE_SIZE); | |
32a7627c | 691 | |
a654b9d8 N |
692 | printk(KERN_ALERT "%s: kicking failed bitmap file %s from array!\n", |
693 | bmname(bitmap), ptr ? ptr : ""); | |
32a7627c | 694 | |
a654b9d8 N |
695 | kfree(path); |
696 | } | |
32a7627c N |
697 | |
698 | bitmap_file_put(bitmap); | |
699 | ||
700 | return; | |
701 | } | |
702 | ||
703 | enum bitmap_page_attr { | |
e16b68b6 N |
704 | BITMAP_PAGE_DIRTY = 0, // there are set bits that need to be synced |
705 | BITMAP_PAGE_CLEAN = 1, // there are bits that might need to be cleared | |
706 | BITMAP_PAGE_NEEDWRITE=2, // there are cleared bits that need to be synced | |
32a7627c N |
707 | }; |
708 | ||
709 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, | |
710 | enum bitmap_page_attr attr) | |
711 | { | |
e16b68b6 | 712 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
713 | } |
714 | ||
715 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, | |
716 | enum bitmap_page_attr attr) | |
717 | { | |
e16b68b6 | 718 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
719 | } |
720 | ||
ec7a3197 N |
721 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
722 | enum bitmap_page_attr attr) | |
32a7627c | 723 | { |
e16b68b6 | 724 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); |
32a7627c N |
725 | } |
726 | ||
727 | /* | |
728 | * bitmap_file_set_bit -- called before performing a write to the md device | |
729 | * to set (and eventually sync) a particular bit in the bitmap file | |
730 | * | |
731 | * we set the bit immediately, then we record the page number so that | |
732 | * when an unplug occurs, we can flush the dirty pages out to disk | |
733 | */ | |
734 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) | |
735 | { | |
736 | unsigned long bit; | |
737 | struct page *page; | |
738 | void *kaddr; | |
739 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); | |
740 | ||
a654b9d8 | 741 | if (!bitmap->filemap) { |
32a7627c N |
742 | return; |
743 | } | |
744 | ||
745 | page = filemap_get_page(bitmap, chunk); | |
746 | bit = file_page_offset(chunk); | |
747 | ||
32a7627c N |
748 | /* set the bit */ |
749 | kaddr = kmap_atomic(page, KM_USER0); | |
bd926c63 N |
750 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
751 | set_bit(bit, kaddr); | |
752 | else | |
753 | ext2_set_bit(bit, kaddr); | |
32a7627c N |
754 | kunmap_atomic(kaddr, KM_USER0); |
755 | PRINTK("set file bit %lu page %lu\n", bit, page->index); | |
756 | ||
757 | /* record page number so it gets flushed to disk when unplug occurs */ | |
758 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); | |
759 | ||
760 | } | |
761 | ||
762 | /* this gets called when the md device is ready to unplug its underlying | |
763 | * (slave) device queues -- before we let any writes go down, we need to | |
764 | * sync the dirty pages of the bitmap file to disk */ | |
765 | int bitmap_unplug(struct bitmap *bitmap) | |
766 | { | |
ec7a3197 N |
767 | unsigned long i, flags; |
768 | int dirty, need_write; | |
32a7627c N |
769 | struct page *page; |
770 | int wait = 0; | |
8a5e9cf1 | 771 | int err; |
32a7627c N |
772 | |
773 | if (!bitmap) | |
774 | return 0; | |
775 | ||
776 | /* look at each page to see if there are any set bits that need to be | |
777 | * flushed out to disk */ | |
778 | for (i = 0; i < bitmap->file_pages; i++) { | |
779 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 780 | if (!bitmap->filemap) { |
32a7627c N |
781 | spin_unlock_irqrestore(&bitmap->lock, flags); |
782 | return 0; | |
783 | } | |
784 | page = bitmap->filemap[i]; | |
ec7a3197 N |
785 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
786 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
32a7627c N |
787 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
788 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); | |
ec7a3197 | 789 | if (dirty) |
32a7627c N |
790 | wait = 1; |
791 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
792 | ||
d785a06a | 793 | if (dirty | need_write) |
8a5e9cf1 | 794 | err = write_page(bitmap, page, 0); |
32a7627c N |
795 | } |
796 | if (wait) { /* if any writes were performed, we need to wait on them */ | |
0b79ccf0 | 797 | if (bitmap->file) |
d785a06a N |
798 | wait_event(bitmap->write_wait, |
799 | atomic_read(&bitmap->pending_writes)==0); | |
0b79ccf0 | 800 | else |
a9701a30 | 801 | md_super_wait(bitmap->mddev); |
32a7627c | 802 | } |
d785a06a N |
803 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
804 | bitmap_file_kick(bitmap); | |
32a7627c N |
805 | return 0; |
806 | } | |
807 | ||
6a07997f | 808 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
32a7627c N |
809 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
810 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the | |
811 | * memory mapping of the bitmap file | |
812 | * Special cases: | |
813 | * if there's no bitmap file, or if the bitmap file had been | |
814 | * previously kicked from the array, we mark all the bits as | |
815 | * 1's in order to cause a full resync. | |
6a07997f N |
816 | * |
817 | * We ignore all bits for sectors that end earlier than 'start'. | |
818 | * This is used when reading an out-of-date bitmap... | |
32a7627c | 819 | */ |
6a07997f | 820 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
32a7627c N |
821 | { |
822 | unsigned long i, chunks, index, oldindex, bit; | |
823 | struct page *page = NULL, *oldpage = NULL; | |
824 | unsigned long num_pages, bit_cnt = 0; | |
825 | struct file *file; | |
d785a06a | 826 | unsigned long bytes, offset; |
32a7627c N |
827 | int outofdate; |
828 | int ret = -ENOSPC; | |
ea03aff9 | 829 | void *paddr; |
32a7627c N |
830 | |
831 | chunks = bitmap->chunks; | |
832 | file = bitmap->file; | |
833 | ||
a654b9d8 | 834 | BUG_ON(!file && !bitmap->offset); |
32a7627c | 835 | |
44456d37 | 836 | #ifdef INJECT_FAULTS_3 |
32a7627c N |
837 | outofdate = 1; |
838 | #else | |
839 | outofdate = bitmap->flags & BITMAP_STALE; | |
840 | #endif | |
841 | if (outofdate) | |
842 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " | |
843 | "recovery\n", bmname(bitmap)); | |
844 | ||
845 | bytes = (chunks + 7) / 8; | |
bc7f77de | 846 | |
cdbb4cc2 | 847 | num_pages = (bytes + sizeof(bitmap_super_t) + PAGE_SIZE - 1) / PAGE_SIZE; |
bc7f77de | 848 | |
a654b9d8 | 849 | if (file && i_size_read(file->f_mapping->host) < bytes + sizeof(bitmap_super_t)) { |
32a7627c N |
850 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
851 | bmname(bitmap), | |
852 | (unsigned long) i_size_read(file->f_mapping->host), | |
853 | bytes + sizeof(bitmap_super_t)); | |
854 | goto out; | |
855 | } | |
bc7f77de N |
856 | |
857 | ret = -ENOMEM; | |
858 | ||
32a7627c | 859 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
bc7f77de | 860 | if (!bitmap->filemap) |
32a7627c | 861 | goto out; |
32a7627c | 862 | |
e16b68b6 N |
863 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
864 | bitmap->filemap_attr = kzalloc( | |
865 | (((num_pages*4/8)+sizeof(unsigned long)-1) | |
866 | /sizeof(unsigned long)) | |
867 | *sizeof(unsigned long), | |
868 | GFP_KERNEL); | |
bc7f77de | 869 | if (!bitmap->filemap_attr) |
32a7627c | 870 | goto out; |
32a7627c | 871 | |
32a7627c N |
872 | oldindex = ~0L; |
873 | ||
874 | for (i = 0; i < chunks; i++) { | |
bd926c63 | 875 | int b; |
32a7627c N |
876 | index = file_page_index(i); |
877 | bit = file_page_offset(i); | |
878 | if (index != oldindex) { /* this is a new page, read it in */ | |
d785a06a | 879 | int count; |
32a7627c | 880 | /* unmap the old page, we're done with it */ |
d785a06a N |
881 | if (index == num_pages-1) |
882 | count = bytes - index * PAGE_SIZE; | |
883 | else | |
884 | count = PAGE_SIZE; | |
32a7627c N |
885 | if (index == 0) { |
886 | /* | |
887 | * if we're here then the superblock page | |
888 | * contains some bits (PAGE_SIZE != sizeof sb) | |
889 | * we've already read it in, so just use it | |
890 | */ | |
891 | page = bitmap->sb_page; | |
892 | offset = sizeof(bitmap_super_t); | |
a654b9d8 | 893 | } else if (file) { |
d785a06a | 894 | page = read_page(file, index, bitmap, count); |
a654b9d8 N |
895 | offset = 0; |
896 | } else { | |
897 | page = read_sb_page(bitmap->mddev, bitmap->offset, index); | |
32a7627c N |
898 | offset = 0; |
899 | } | |
a654b9d8 N |
900 | if (IS_ERR(page)) { /* read error */ |
901 | ret = PTR_ERR(page); | |
902 | goto out; | |
903 | } | |
904 | ||
32a7627c N |
905 | oldindex = index; |
906 | oldpage = page; | |
32a7627c N |
907 | |
908 | if (outofdate) { | |
909 | /* | |
910 | * if bitmap is out of date, dirty the | |
911 | * whole page and write it out | |
912 | */ | |
ea03aff9 N |
913 | paddr = kmap_atomic(page, KM_USER0); |
914 | memset(paddr + offset, 0xff, | |
6a07997f | 915 | PAGE_SIZE - offset); |
ea03aff9 | 916 | kunmap_atomic(paddr, KM_USER0); |
77ad4bc7 | 917 | ret = write_page(bitmap, page, 1); |
32a7627c | 918 | if (ret) { |
32a7627c | 919 | /* release, page not in filemap yet */ |
2d1f3b5d | 920 | put_page(page); |
32a7627c N |
921 | goto out; |
922 | } | |
923 | } | |
924 | ||
925 | bitmap->filemap[bitmap->file_pages++] = page; | |
926 | } | |
ea03aff9 | 927 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 928 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 929 | b = test_bit(bit, paddr); |
bd926c63 | 930 | else |
ea03aff9 N |
931 | b = ext2_test_bit(bit, paddr); |
932 | kunmap_atomic(paddr, KM_USER0); | |
bd926c63 | 933 | if (b) { |
32a7627c | 934 | /* if the disk bit is set, set the memory bit */ |
6a07997f N |
935 | bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap), |
936 | ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start) | |
937 | ); | |
32a7627c | 938 | bit_cnt++; |
6a07997f | 939 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
32a7627c | 940 | } |
32a7627c N |
941 | } |
942 | ||
943 | /* everything went OK */ | |
944 | ret = 0; | |
945 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); | |
946 | ||
32a7627c N |
947 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
948 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); | |
949 | md_wakeup_thread(bitmap->mddev->thread); | |
950 | } | |
951 | ||
952 | out: | |
953 | printk(KERN_INFO "%s: bitmap initialized from disk: " | |
954 | "read %lu/%lu pages, set %lu bits, status: %d\n", | |
955 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, ret); | |
956 | ||
957 | return ret; | |
958 | } | |
959 | ||
a654b9d8 N |
960 | void bitmap_write_all(struct bitmap *bitmap) |
961 | { | |
962 | /* We don't actually write all bitmap blocks here, | |
963 | * just flag them as needing to be written | |
964 | */ | |
ec7a3197 | 965 | int i; |
a654b9d8 | 966 | |
ec7a3197 N |
967 | for (i=0; i < bitmap->file_pages; i++) |
968 | set_page_attr(bitmap, bitmap->filemap[i], | |
969 | BITMAP_PAGE_NEEDWRITE); | |
a654b9d8 N |
970 | } |
971 | ||
32a7627c N |
972 | |
973 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) | |
974 | { | |
975 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
976 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
977 | bitmap->bp[page].count += inc; | |
978 | /* | |
979 | if (page == 0) printk("count page 0, offset %llu: %d gives %d\n", | |
980 | (unsigned long long)offset, inc, bitmap->bp[page].count); | |
981 | */ | |
982 | bitmap_checkfree(bitmap, page); | |
983 | } | |
984 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, | |
985 | sector_t offset, int *blocks, | |
986 | int create); | |
987 | ||
988 | /* | |
989 | * bitmap daemon -- periodically wakes up to clean bits and flush pages | |
990 | * out to disk | |
991 | */ | |
992 | ||
993 | int bitmap_daemon_work(struct bitmap *bitmap) | |
994 | { | |
aa3163f8 | 995 | unsigned long j; |
32a7627c N |
996 | unsigned long flags; |
997 | struct page *page = NULL, *lastpage = NULL; | |
998 | int err = 0; | |
999 | int blocks; | |
ea03aff9 | 1000 | void *paddr; |
32a7627c N |
1001 | |
1002 | if (bitmap == NULL) | |
1003 | return 0; | |
1004 | if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ)) | |
1005 | return 0; | |
1006 | bitmap->daemon_lastrun = jiffies; | |
1007 | ||
1008 | for (j = 0; j < bitmap->chunks; j++) { | |
1009 | bitmap_counter_t *bmc; | |
1010 | spin_lock_irqsave(&bitmap->lock, flags); | |
a654b9d8 | 1011 | if (!bitmap->filemap) { |
32a7627c N |
1012 | /* error or shutdown */ |
1013 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1014 | break; | |
1015 | } | |
1016 | ||
1017 | page = filemap_get_page(bitmap, j); | |
32a7627c N |
1018 | |
1019 | if (page != lastpage) { | |
aa3163f8 | 1020 | /* skip this page unless it's marked as needing cleaning */ |
ec7a3197 N |
1021 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) { |
1022 | int need_write = test_page_attr(bitmap, page, | |
1023 | BITMAP_PAGE_NEEDWRITE); | |
a647e4bc | 1024 | if (need_write) |
aa3163f8 | 1025 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
a647e4bc | 1026 | |
aa3163f8 | 1027 | spin_unlock_irqrestore(&bitmap->lock, flags); |
ec7a3197 | 1028 | if (need_write) { |
8a5e9cf1 | 1029 | switch (write_page(bitmap, page, 0)) { |
8a5e9cf1 N |
1030 | case 0: |
1031 | break; | |
1032 | default: | |
aa3163f8 | 1033 | bitmap_file_kick(bitmap); |
8a5e9cf1 | 1034 | } |
aa3163f8 N |
1035 | } |
1036 | continue; | |
1037 | } | |
1038 | ||
32a7627c | 1039 | /* grab the new page, sync and release the old */ |
32a7627c | 1040 | if (lastpage != NULL) { |
ec7a3197 | 1041 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1042 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1043 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
77ad4bc7 | 1044 | err = write_page(bitmap, lastpage, 0); |
32a7627c N |
1045 | } else { |
1046 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1047 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1048 | } | |
32a7627c N |
1049 | if (err) |
1050 | bitmap_file_kick(bitmap); | |
1051 | } else | |
1052 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1053 | lastpage = page; | |
32a7627c N |
1054 | /* |
1055 | printk("bitmap clean at page %lu\n", j); | |
1056 | */ | |
1057 | spin_lock_irqsave(&bitmap->lock, flags); | |
1058 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1059 | } | |
1060 | bmc = bitmap_get_counter(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), | |
1061 | &blocks, 0); | |
1062 | if (bmc) { | |
1063 | /* | |
1064 | if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc); | |
1065 | */ | |
1066 | if (*bmc == 2) { | |
1067 | *bmc=1; /* maybe clear the bit next time */ | |
1068 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1069 | } else if (*bmc == 1) { | |
1070 | /* we can clear the bit */ | |
1071 | *bmc = 0; | |
1072 | bitmap_count_page(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), | |
1073 | -1); | |
1074 | ||
1075 | /* clear the bit */ | |
ea03aff9 | 1076 | paddr = kmap_atomic(page, KM_USER0); |
bd926c63 | 1077 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
ea03aff9 | 1078 | clear_bit(file_page_offset(j), paddr); |
bd926c63 | 1079 | else |
ea03aff9 N |
1080 | ext2_clear_bit(file_page_offset(j), paddr); |
1081 | kunmap_atomic(paddr, KM_USER0); | |
32a7627c N |
1082 | } |
1083 | } | |
1084 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1085 | } | |
1086 | ||
1087 | /* now sync the final page */ | |
1088 | if (lastpage != NULL) { | |
32a7627c | 1089 | spin_lock_irqsave(&bitmap->lock, flags); |
ec7a3197 | 1090 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
32a7627c N |
1091 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
1092 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
77ad4bc7 | 1093 | err = write_page(bitmap, lastpage, 0); |
32a7627c N |
1094 | } else { |
1095 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); | |
1096 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1097 | } | |
32a7627c N |
1098 | } |
1099 | ||
1100 | return err; | |
1101 | } | |
1102 | ||
32a7627c N |
1103 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
1104 | sector_t offset, int *blocks, | |
1105 | int create) | |
1106 | { | |
1107 | /* If 'create', we might release the lock and reclaim it. | |
1108 | * The lock must have been taken with interrupts enabled. | |
1109 | * If !create, we don't release the lock. | |
1110 | */ | |
1111 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); | |
1112 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; | |
1113 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; | |
1114 | sector_t csize; | |
1115 | ||
1116 | if (bitmap_checkpage(bitmap, page, create) < 0) { | |
1117 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
1118 | *blocks = csize - (offset & (csize- 1)); | |
1119 | return NULL; | |
1120 | } | |
1121 | /* now locked ... */ | |
1122 | ||
1123 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ | |
1124 | /* should we use the first or second counter field | |
1125 | * of the hijacked pointer? */ | |
1126 | int hi = (pageoff > PAGE_COUNTER_MASK); | |
1127 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + | |
1128 | PAGE_COUNTER_SHIFT - 1); | |
1129 | *blocks = csize - (offset & (csize- 1)); | |
1130 | return &((bitmap_counter_t *) | |
1131 | &bitmap->bp[page].map)[hi]; | |
1132 | } else { /* page is allocated */ | |
1133 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); | |
1134 | *blocks = csize - (offset & (csize- 1)); | |
1135 | return (bitmap_counter_t *) | |
1136 | &(bitmap->bp[page].map[pageoff]); | |
1137 | } | |
1138 | } | |
1139 | ||
4b6d287f | 1140 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
32a7627c N |
1141 | { |
1142 | if (!bitmap) return 0; | |
4b6d287f N |
1143 | |
1144 | if (behind) { | |
1145 | atomic_inc(&bitmap->behind_writes); | |
1146 | PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", | |
1147 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1148 | } | |
1149 | ||
32a7627c N |
1150 | while (sectors) { |
1151 | int blocks; | |
1152 | bitmap_counter_t *bmc; | |
1153 | ||
1154 | spin_lock_irq(&bitmap->lock); | |
1155 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); | |
1156 | if (!bmc) { | |
1157 | spin_unlock_irq(&bitmap->lock); | |
1158 | return 0; | |
1159 | } | |
1160 | ||
1161 | switch(*bmc) { | |
1162 | case 0: | |
1163 | bitmap_file_set_bit(bitmap, offset); | |
1164 | bitmap_count_page(bitmap,offset, 1); | |
1165 | blk_plug_device(bitmap->mddev->queue); | |
1166 | /* fall through */ | |
1167 | case 1: | |
1168 | *bmc = 2; | |
1169 | } | |
5daf2cf1 | 1170 | BUG_ON((*bmc & COUNTER_MAX) == COUNTER_MAX); |
32a7627c N |
1171 | (*bmc)++; |
1172 | ||
1173 | spin_unlock_irq(&bitmap->lock); | |
1174 | ||
1175 | offset += blocks; | |
1176 | if (sectors > blocks) | |
1177 | sectors -= blocks; | |
1178 | else sectors = 0; | |
1179 | } | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, | |
4b6d287f | 1184 | int success, int behind) |
32a7627c N |
1185 | { |
1186 | if (!bitmap) return; | |
4b6d287f N |
1187 | if (behind) { |
1188 | atomic_dec(&bitmap->behind_writes); | |
1189 | PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", | |
1190 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); | |
1191 | } | |
1192 | ||
32a7627c N |
1193 | while (sectors) { |
1194 | int blocks; | |
1195 | unsigned long flags; | |
1196 | bitmap_counter_t *bmc; | |
1197 | ||
1198 | spin_lock_irqsave(&bitmap->lock, flags); | |
1199 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); | |
1200 | if (!bmc) { | |
1201 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1202 | return; | |
1203 | } | |
1204 | ||
1205 | if (!success && ! (*bmc & NEEDED_MASK)) | |
1206 | *bmc |= NEEDED_MASK; | |
1207 | ||
1208 | (*bmc)--; | |
1209 | if (*bmc <= 2) { | |
1210 | set_page_attr(bitmap, | |
1211 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1212 | BITMAP_PAGE_CLEAN); | |
1213 | } | |
1214 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1215 | offset += blocks; | |
1216 | if (sectors > blocks) | |
1217 | sectors -= blocks; | |
1218 | else sectors = 0; | |
1219 | } | |
1220 | } | |
1221 | ||
6a806c51 N |
1222 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, |
1223 | int degraded) | |
32a7627c N |
1224 | { |
1225 | bitmap_counter_t *bmc; | |
1226 | int rv; | |
1227 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ | |
1228 | *blocks = 1024; | |
1229 | return 1; /* always resync if no bitmap */ | |
1230 | } | |
1231 | spin_lock_irq(&bitmap->lock); | |
1232 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1233 | rv = 0; | |
1234 | if (bmc) { | |
1235 | /* locked */ | |
1236 | if (RESYNC(*bmc)) | |
1237 | rv = 1; | |
1238 | else if (NEEDED(*bmc)) { | |
1239 | rv = 1; | |
6a806c51 N |
1240 | if (!degraded) { /* don't set/clear bits if degraded */ |
1241 | *bmc |= RESYNC_MASK; | |
1242 | *bmc &= ~NEEDED_MASK; | |
1243 | } | |
32a7627c N |
1244 | } |
1245 | } | |
1246 | spin_unlock_irq(&bitmap->lock); | |
1247 | return rv; | |
1248 | } | |
1249 | ||
1250 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted) | |
1251 | { | |
1252 | bitmap_counter_t *bmc; | |
1253 | unsigned long flags; | |
1254 | /* | |
1255 | if (offset == 0) printk("bitmap_end_sync 0 (%d)\n", aborted); | |
1256 | */ if (bitmap == NULL) { | |
1257 | *blocks = 1024; | |
1258 | return; | |
1259 | } | |
1260 | spin_lock_irqsave(&bitmap->lock, flags); | |
1261 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); | |
1262 | if (bmc == NULL) | |
1263 | goto unlock; | |
1264 | /* locked */ | |
1265 | /* | |
1266 | if (offset == 0) printk("bitmap_end sync found 0x%x, blocks %d\n", *bmc, *blocks); | |
1267 | */ | |
1268 | if (RESYNC(*bmc)) { | |
1269 | *bmc &= ~RESYNC_MASK; | |
1270 | ||
1271 | if (!NEEDED(*bmc) && aborted) | |
1272 | *bmc |= NEEDED_MASK; | |
1273 | else { | |
1274 | if (*bmc <= 2) { | |
1275 | set_page_attr(bitmap, | |
1276 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), | |
1277 | BITMAP_PAGE_CLEAN); | |
1278 | } | |
1279 | } | |
1280 | } | |
1281 | unlock: | |
1282 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1283 | } | |
1284 | ||
1285 | void bitmap_close_sync(struct bitmap *bitmap) | |
1286 | { | |
1287 | /* Sync has finished, and any bitmap chunks that weren't synced | |
1288 | * properly have been aborted. It remains to us to clear the | |
1289 | * RESYNC bit wherever it is still on | |
1290 | */ | |
1291 | sector_t sector = 0; | |
1292 | int blocks; | |
1293 | if (!bitmap) return; | |
1294 | while (sector < bitmap->mddev->resync_max_sectors) { | |
1295 | bitmap_end_sync(bitmap, sector, &blocks, 0); | |
1296 | /* | |
1297 | if (sector < 500) printk("bitmap_close_sync: sec %llu blks %d\n", | |
1298 | (unsigned long long)sector, blocks); | |
1299 | */ sector += blocks; | |
1300 | } | |
1301 | } | |
1302 | ||
6a07997f | 1303 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
32a7627c N |
1304 | { |
1305 | /* For each chunk covered by any of these sectors, set the | |
193f1c93 | 1306 | * counter to 1 and set resync_needed. They should all |
32a7627c N |
1307 | * be 0 at this point |
1308 | */ | |
193f1c93 N |
1309 | |
1310 | int secs; | |
1311 | bitmap_counter_t *bmc; | |
1312 | spin_lock_irq(&bitmap->lock); | |
1313 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); | |
1314 | if (!bmc) { | |
32a7627c | 1315 | spin_unlock_irq(&bitmap->lock); |
193f1c93 | 1316 | return; |
32a7627c | 1317 | } |
193f1c93 N |
1318 | if (! *bmc) { |
1319 | struct page *page; | |
6a07997f | 1320 | *bmc = 1 | (needed?NEEDED_MASK:0); |
193f1c93 N |
1321 | bitmap_count_page(bitmap, offset, 1); |
1322 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); | |
1323 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); | |
1324 | } | |
1325 | spin_unlock_irq(&bitmap->lock); | |
1326 | ||
32a7627c N |
1327 | } |
1328 | ||
6b8b3e8a N |
1329 | /* |
1330 | * flush out any pending updates | |
1331 | */ | |
1332 | void bitmap_flush(mddev_t *mddev) | |
1333 | { | |
1334 | struct bitmap *bitmap = mddev->bitmap; | |
1335 | int sleep; | |
1336 | ||
1337 | if (!bitmap) /* there was no bitmap */ | |
1338 | return; | |
1339 | ||
1340 | /* run the daemon_work three time to ensure everything is flushed | |
1341 | * that can be | |
1342 | */ | |
1343 | sleep = bitmap->daemon_sleep; | |
1344 | bitmap->daemon_sleep = 0; | |
1345 | bitmap_daemon_work(bitmap); | |
1346 | bitmap_daemon_work(bitmap); | |
1347 | bitmap_daemon_work(bitmap); | |
1348 | bitmap->daemon_sleep = sleep; | |
1349 | bitmap_update_sb(bitmap); | |
1350 | } | |
1351 | ||
32a7627c N |
1352 | /* |
1353 | * free memory that was allocated | |
1354 | */ | |
3178b0db | 1355 | static void bitmap_free(struct bitmap *bitmap) |
32a7627c N |
1356 | { |
1357 | unsigned long k, pages; | |
1358 | struct bitmap_page *bp; | |
32a7627c N |
1359 | |
1360 | if (!bitmap) /* there was no bitmap */ | |
1361 | return; | |
1362 | ||
32a7627c N |
1363 | /* release the bitmap file and kill the daemon */ |
1364 | bitmap_file_put(bitmap); | |
1365 | ||
1366 | bp = bitmap->bp; | |
1367 | pages = bitmap->pages; | |
1368 | ||
1369 | /* free all allocated memory */ | |
1370 | ||
32a7627c N |
1371 | if (bp) /* deallocate the page memory */ |
1372 | for (k = 0; k < pages; k++) | |
1373 | if (bp[k].map && !bp[k].hijacked) | |
1374 | kfree(bp[k].map); | |
1375 | kfree(bp); | |
1376 | kfree(bitmap); | |
1377 | } | |
3178b0db N |
1378 | void bitmap_destroy(mddev_t *mddev) |
1379 | { | |
1380 | struct bitmap *bitmap = mddev->bitmap; | |
1381 | ||
1382 | if (!bitmap) /* there was no bitmap */ | |
1383 | return; | |
1384 | ||
1385 | mddev->bitmap = NULL; /* disconnect from the md device */ | |
b15c2e57 N |
1386 | if (mddev->thread) |
1387 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; | |
3178b0db N |
1388 | |
1389 | bitmap_free(bitmap); | |
1390 | } | |
32a7627c N |
1391 | |
1392 | /* | |
1393 | * initialize the bitmap structure | |
1394 | * if this returns an error, bitmap_destroy must be called to do clean up | |
1395 | */ | |
1396 | int bitmap_create(mddev_t *mddev) | |
1397 | { | |
1398 | struct bitmap *bitmap; | |
1399 | unsigned long blocks = mddev->resync_max_sectors; | |
1400 | unsigned long chunks; | |
1401 | unsigned long pages; | |
1402 | struct file *file = mddev->bitmap_file; | |
1403 | int err; | |
6a07997f | 1404 | sector_t start; |
32a7627c N |
1405 | |
1406 | BUG_ON(sizeof(bitmap_super_t) != 256); | |
1407 | ||
a654b9d8 | 1408 | if (!file && !mddev->bitmap_offset) /* bitmap disabled, nothing to do */ |
32a7627c N |
1409 | return 0; |
1410 | ||
a654b9d8 N |
1411 | BUG_ON(file && mddev->bitmap_offset); |
1412 | ||
9ffae0cf | 1413 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
32a7627c N |
1414 | if (!bitmap) |
1415 | return -ENOMEM; | |
1416 | ||
32a7627c N |
1417 | spin_lock_init(&bitmap->lock); |
1418 | bitmap->mddev = mddev; | |
32a7627c | 1419 | |
32a7627c | 1420 | bitmap->file = file; |
a654b9d8 N |
1421 | bitmap->offset = mddev->bitmap_offset; |
1422 | if (file) get_file(file); | |
d785a06a N |
1423 | |
1424 | /* Ensure we read fresh data */ | |
1425 | invalidate_inode_pages(file->f_dentry->d_inode->i_mapping); | |
1426 | ||
32a7627c N |
1427 | /* read superblock from bitmap file (this sets bitmap->chunksize) */ |
1428 | err = bitmap_read_sb(bitmap); | |
1429 | if (err) | |
3178b0db | 1430 | goto error; |
32a7627c N |
1431 | |
1432 | bitmap->chunkshift = find_first_bit(&bitmap->chunksize, | |
1433 | sizeof(bitmap->chunksize)); | |
1434 | ||
1435 | /* now that chunksize and chunkshift are set, we can use these macros */ | |
1436 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) / | |
1437 | CHUNK_BLOCK_RATIO(bitmap); | |
1438 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; | |
1439 | ||
1440 | BUG_ON(!pages); | |
1441 | ||
1442 | bitmap->chunks = chunks; | |
1443 | bitmap->pages = pages; | |
1444 | bitmap->missing_pages = pages; | |
1445 | bitmap->counter_bits = COUNTER_BITS; | |
1446 | ||
1447 | bitmap->syncchunk = ~0UL; | |
1448 | ||
d785a06a N |
1449 | atomic_set(&bitmap->pending_writes, 0); |
1450 | init_waitqueue_head(&bitmap->write_wait); | |
1451 | ||
44456d37 | 1452 | #ifdef INJECT_FATAL_FAULT_1 |
32a7627c N |
1453 | bitmap->bp = NULL; |
1454 | #else | |
9ffae0cf | 1455 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
32a7627c | 1456 | #endif |
3178b0db | 1457 | err = -ENOMEM; |
32a7627c | 1458 | if (!bitmap->bp) |
3178b0db | 1459 | goto error; |
32a7627c | 1460 | |
32a7627c N |
1461 | /* now that we have some pages available, initialize the in-memory |
1462 | * bitmap from the on-disk bitmap */ | |
6a07997f N |
1463 | start = 0; |
1464 | if (mddev->degraded == 0 | |
1465 | || bitmap->events_cleared == mddev->events) | |
1466 | /* no need to keep dirty bits to optimise a re-add of a missing device */ | |
1467 | start = mddev->recovery_cp; | |
1468 | err = bitmap_init_from_disk(bitmap, start); | |
193f1c93 | 1469 | |
32a7627c | 1470 | if (err) |
3178b0db | 1471 | goto error; |
32a7627c N |
1472 | |
1473 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", | |
1474 | pages, bmname(bitmap)); | |
1475 | ||
3178b0db N |
1476 | mddev->bitmap = bitmap; |
1477 | ||
b15c2e57 N |
1478 | mddev->thread->timeout = bitmap->daemon_sleep * HZ; |
1479 | ||
32a7627c | 1480 | return bitmap_update_sb(bitmap); |
3178b0db N |
1481 | |
1482 | error: | |
1483 | bitmap_free(bitmap); | |
1484 | return err; | |
32a7627c N |
1485 | } |
1486 | ||
1487 | /* the bitmap API -- for raid personalities */ | |
1488 | EXPORT_SYMBOL(bitmap_startwrite); | |
1489 | EXPORT_SYMBOL(bitmap_endwrite); | |
1490 | EXPORT_SYMBOL(bitmap_start_sync); | |
1491 | EXPORT_SYMBOL(bitmap_end_sync); | |
1492 | EXPORT_SYMBOL(bitmap_unplug); | |
1493 | EXPORT_SYMBOL(bitmap_close_sync); |