NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 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 |
| 10 | * - added bitmap daemon (to asynchronously clear bitmap bits from disk) |
| 11 | */ |
| 12 | |
| 13 | /* |
| 14 | * Still to do: |
| 15 | * |
| 16 | * flush after percent set rather than just time based. (maybe both). |
| 17 | * wait if count gets too high, wake when it drops to half. |
| 18 | * allow bitmap to be mirrored with superblock (before or after...) |
| 19 | * allow hot-add to re-instate a current device. |
| 20 | * allow hot-add of bitmap after quiessing device |
| 21 | */ |
| 22 | |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/version.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/config.h> |
| 29 | #include <linux/timer.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/list.h> |
| 32 | #include <linux/file.h> |
| 33 | #include <linux/mount.h> |
| 34 | #include <linux/buffer_head.h> |
| 35 | #include <linux/raid/md.h> |
| 36 | #include <linux/raid/bitmap.h> |
| 37 | |
| 38 | /* debug macros */ |
| 39 | |
| 40 | #define DEBUG 0 |
| 41 | |
| 42 | #if DEBUG |
| 43 | /* these are for debugging purposes only! */ |
| 44 | |
| 45 | /* define one and only one of these */ |
| 46 | #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */ |
| 47 | #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/ |
| 48 | #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */ |
| 49 | #define INJECT_FAULTS_4 0 /* undef */ |
| 50 | #define INJECT_FAULTS_5 0 /* undef */ |
| 51 | #define INJECT_FAULTS_6 0 |
| 52 | |
| 53 | /* if these are defined, the driver will fail! debug only */ |
| 54 | #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */ |
| 55 | #define INJECT_FATAL_FAULT_2 0 /* undef */ |
| 56 | #define INJECT_FATAL_FAULT_3 0 /* undef */ |
| 57 | #endif |
| 58 | |
| 59 | //#define DPRINTK PRINTK /* set this NULL to avoid verbose debug output */ |
| 60 | #define DPRINTK(x...) do { } while(0) |
| 61 | |
| 62 | #ifndef PRINTK |
| 63 | # if DEBUG > 0 |
| 64 | # define PRINTK(x...) printk(KERN_DEBUG x) |
| 65 | # else |
| 66 | # define PRINTK(x...) |
| 67 | # endif |
| 68 | #endif |
| 69 | |
| 70 | static inline char * bmname(struct bitmap *bitmap) |
| 71 | { |
| 72 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; |
| 73 | } |
| 74 | |
| 75 | |
| 76 | /* |
| 77 | * test if the bitmap is active |
| 78 | */ |
| 79 | int bitmap_active(struct bitmap *bitmap) |
| 80 | { |
| 81 | unsigned long flags; |
| 82 | int res = 0; |
| 83 | |
| 84 | if (!bitmap) |
| 85 | return res; |
| 86 | spin_lock_irqsave(&bitmap->lock, flags); |
| 87 | res = bitmap->flags & BITMAP_ACTIVE; |
| 88 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 89 | return res; |
| 90 | } |
| 91 | |
| 92 | #define WRITE_POOL_SIZE 256 |
| 93 | /* mempool for queueing pending writes on the bitmap file */ |
| 94 | static void *write_pool_alloc(unsigned int gfp_flags, void *data) |
| 95 | { |
| 96 | return kmalloc(sizeof(struct page_list), gfp_flags); |
| 97 | } |
| 98 | |
| 99 | static void write_pool_free(void *ptr, void *data) |
| 100 | { |
| 101 | kfree(ptr); |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * just a placeholder - calls kmalloc for bitmap pages |
| 106 | */ |
| 107 | static unsigned char *bitmap_alloc_page(struct bitmap *bitmap) |
| 108 | { |
| 109 | unsigned char *page; |
| 110 | |
| 111 | #if INJECT_FAULTS_1 |
| 112 | page = NULL; |
| 113 | #else |
| 114 | page = kmalloc(PAGE_SIZE, GFP_NOIO); |
| 115 | #endif |
| 116 | if (!page) |
| 117 | printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap)); |
| 118 | else |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 119 | PRINTK("%s: bitmap_alloc_page: allocated page at %p\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 120 | bmname(bitmap), page); |
| 121 | return page; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * for now just a placeholder -- just calls kfree for bitmap pages |
| 126 | */ |
| 127 | static void bitmap_free_page(struct bitmap *bitmap, unsigned char *page) |
| 128 | { |
| 129 | PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap), page); |
| 130 | kfree(page); |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) |
| 135 | * |
| 136 | * 1) check to see if this page is allocated, if it's not then try to alloc |
| 137 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the |
| 138 | * page pointer directly as a counter |
| 139 | * |
| 140 | * if we find our page, we increment the page's refcount so that it stays |
| 141 | * allocated while we're using it |
| 142 | */ |
| 143 | static int bitmap_checkpage(struct bitmap *bitmap, unsigned long page, int create) |
| 144 | { |
| 145 | unsigned char *mappage; |
| 146 | |
| 147 | if (page >= bitmap->pages) { |
| 148 | printk(KERN_ALERT |
| 149 | "%s: invalid bitmap page request: %lu (> %lu)\n", |
| 150 | bmname(bitmap), page, bitmap->pages-1); |
| 151 | return -EINVAL; |
| 152 | } |
| 153 | |
| 154 | |
| 155 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
| 156 | return 0; |
| 157 | |
| 158 | if (bitmap->bp[page].map) /* page is already allocated, just return */ |
| 159 | return 0; |
| 160 | |
| 161 | if (!create) |
| 162 | return -ENOENT; |
| 163 | |
| 164 | spin_unlock_irq(&bitmap->lock); |
| 165 | |
| 166 | /* this page has not been allocated yet */ |
| 167 | |
| 168 | if ((mappage = bitmap_alloc_page(bitmap)) == NULL) { |
| 169 | PRINTK("%s: bitmap map page allocation failed, hijacking\n", |
| 170 | bmname(bitmap)); |
| 171 | /* failed - set the hijacked flag so that we can use the |
| 172 | * pointer as a counter */ |
| 173 | spin_lock_irq(&bitmap->lock); |
| 174 | if (!bitmap->bp[page].map) |
| 175 | bitmap->bp[page].hijacked = 1; |
| 176 | goto out; |
| 177 | } |
| 178 | |
| 179 | /* got a page */ |
| 180 | |
| 181 | spin_lock_irq(&bitmap->lock); |
| 182 | |
| 183 | /* recheck the page */ |
| 184 | |
| 185 | if (bitmap->bp[page].map || bitmap->bp[page].hijacked) { |
| 186 | /* somebody beat us to getting the page */ |
| 187 | bitmap_free_page(bitmap, mappage); |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | /* no page was in place and we have one, so install it */ |
| 192 | |
| 193 | memset(mappage, 0, PAGE_SIZE); |
| 194 | bitmap->bp[page].map = mappage; |
| 195 | bitmap->missing_pages--; |
| 196 | out: |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | |
| 201 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
| 202 | /* if page was hijacked, unmark the flag so it might get alloced next time */ |
| 203 | /* Note: lock should be held when calling this */ |
| 204 | static inline void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
| 205 | { |
| 206 | char *ptr; |
| 207 | |
| 208 | if (bitmap->bp[page].count) /* page is still busy */ |
| 209 | return; |
| 210 | |
| 211 | /* page is no longer in use, it can be released */ |
| 212 | |
| 213 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ |
| 214 | bitmap->bp[page].hijacked = 0; |
| 215 | bitmap->bp[page].map = NULL; |
| 216 | return; |
| 217 | } |
| 218 | |
| 219 | /* normal case, free the page */ |
| 220 | |
| 221 | #if 0 |
| 222 | /* actually ... let's not. We will probably need the page again exactly when |
| 223 | * memory is tight and we are flusing to disk |
| 224 | */ |
| 225 | return; |
| 226 | #else |
| 227 | ptr = bitmap->bp[page].map; |
| 228 | bitmap->bp[page].map = NULL; |
| 229 | bitmap->missing_pages++; |
| 230 | bitmap_free_page(bitmap, ptr); |
| 231 | return; |
| 232 | #endif |
| 233 | } |
| 234 | |
| 235 | |
| 236 | /* |
| 237 | * bitmap file handling - read and write the bitmap file and its superblock |
| 238 | */ |
| 239 | |
| 240 | /* copy the pathname of a file to a buffer */ |
| 241 | char *file_path(struct file *file, char *buf, int count) |
| 242 | { |
| 243 | struct dentry *d; |
| 244 | struct vfsmount *v; |
| 245 | |
| 246 | if (!buf) |
| 247 | return NULL; |
| 248 | |
| 249 | d = file->f_dentry; |
| 250 | v = file->f_vfsmnt; |
| 251 | |
| 252 | buf = d_path(d, v, buf, count); |
| 253 | |
| 254 | return IS_ERR(buf) ? NULL : buf; |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | * basic page I/O operations |
| 259 | */ |
| 260 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 261 | /* IO operations when bitmap is stored near all superblocks */ |
| 262 | static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long index) |
| 263 | { |
| 264 | /* choose a good rdev and read the page from there */ |
| 265 | |
| 266 | mdk_rdev_t *rdev; |
| 267 | struct list_head *tmp; |
| 268 | struct page *page = alloc_page(GFP_KERNEL); |
| 269 | sector_t target; |
| 270 | |
| 271 | if (!page) |
| 272 | return ERR_PTR(-ENOMEM); |
| 273 | do { |
| 274 | ITERATE_RDEV(mddev, rdev, tmp) |
| 275 | if (rdev->in_sync && !rdev->faulty) |
| 276 | goto found; |
| 277 | return ERR_PTR(-EIO); |
| 278 | |
| 279 | found: |
| 280 | target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512); |
| 281 | |
| 282 | } while (!sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)); |
| 283 | |
| 284 | page->index = index; |
| 285 | return page; |
| 286 | } |
| 287 | |
| 288 | static int write_sb_page(mddev_t *mddev, long offset, struct page *page, int wait) |
| 289 | { |
| 290 | mdk_rdev_t *rdev; |
| 291 | struct list_head *tmp; |
| 292 | |
| 293 | ITERATE_RDEV(mddev, rdev, tmp) |
| 294 | if (rdev->in_sync && !rdev->faulty) |
| 295 | md_super_write(mddev, rdev, |
| 296 | (rdev->sb_offset<<1) + offset |
| 297 | + page->index * (PAGE_SIZE/512), |
| 298 | PAGE_SIZE, |
| 299 | page); |
| 300 | |
| 301 | if (wait) |
| 302 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
| 303 | return 0; |
| 304 | } |
| 305 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 306 | /* |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 307 | * write out a page to a file |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 308 | */ |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 309 | static int write_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 310 | { |
| 311 | int ret = -ENOMEM; |
| 312 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 313 | if (bitmap->file == NULL) |
| 314 | return write_sb_page(bitmap->mddev, bitmap->offset, page, wait); |
| 315 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 316 | lock_page(page); |
| 317 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 318 | ret = page->mapping->a_ops->prepare_write(NULL, page, 0, PAGE_SIZE); |
| 319 | if (!ret) |
| 320 | ret = page->mapping->a_ops->commit_write(NULL, page, 0, |
| 321 | PAGE_SIZE); |
| 322 | if (ret) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 323 | unlock_page(page); |
| 324 | return ret; |
| 325 | } |
| 326 | |
| 327 | set_page_dirty(page); /* force it to be written out */ |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 328 | |
| 329 | if (!wait) { |
| 330 | /* add to list to be waited for by daemon */ |
| 331 | struct page_list *item = mempool_alloc(bitmap->write_pool, GFP_NOIO); |
| 332 | item->page = page; |
| 333 | page_cache_get(page); |
| 334 | spin_lock(&bitmap->write_lock); |
| 335 | list_add(&item->list, &bitmap->complete_pages); |
| 336 | spin_unlock(&bitmap->write_lock); |
| 337 | md_wakeup_thread(bitmap->writeback_daemon); |
| 338 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 339 | return write_one_page(page, wait); |
| 340 | } |
| 341 | |
| 342 | /* read a page from a file, pinning it into cache, and return bytes_read */ |
| 343 | static struct page *read_page(struct file *file, unsigned long index, |
| 344 | unsigned long *bytes_read) |
| 345 | { |
| 346 | struct inode *inode = file->f_mapping->host; |
| 347 | struct page *page = NULL; |
| 348 | loff_t isize = i_size_read(inode); |
| 349 | unsigned long end_index = isize >> PAGE_CACHE_SHIFT; |
| 350 | |
| 351 | PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_CACHE_SIZE, |
| 352 | (unsigned long long)index << PAGE_CACHE_SHIFT); |
| 353 | |
| 354 | page = read_cache_page(inode->i_mapping, index, |
| 355 | (filler_t *)inode->i_mapping->a_ops->readpage, file); |
| 356 | if (IS_ERR(page)) |
| 357 | goto out; |
| 358 | wait_on_page_locked(page); |
| 359 | if (!PageUptodate(page) || PageError(page)) { |
| 360 | page_cache_release(page); |
| 361 | page = ERR_PTR(-EIO); |
| 362 | goto out; |
| 363 | } |
| 364 | |
| 365 | if (index > end_index) /* we have read beyond EOF */ |
| 366 | *bytes_read = 0; |
| 367 | else if (index == end_index) /* possible short read */ |
| 368 | *bytes_read = isize & ~PAGE_CACHE_MASK; |
| 369 | else |
| 370 | *bytes_read = PAGE_CACHE_SIZE; /* got a full page */ |
| 371 | out: |
| 372 | if (IS_ERR(page)) |
| 373 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %Lu): %ld\n", |
| 374 | (int)PAGE_CACHE_SIZE, |
| 375 | (unsigned long long)index << PAGE_CACHE_SHIFT, |
| 376 | PTR_ERR(page)); |
| 377 | return page; |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * bitmap file superblock operations |
| 382 | */ |
| 383 | |
| 384 | /* update the event counter and sync the superblock to disk */ |
| 385 | int bitmap_update_sb(struct bitmap *bitmap) |
| 386 | { |
| 387 | bitmap_super_t *sb; |
| 388 | unsigned long flags; |
| 389 | |
| 390 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ |
| 391 | return 0; |
| 392 | spin_lock_irqsave(&bitmap->lock, flags); |
| 393 | if (!bitmap->sb_page) { /* no superblock */ |
| 394 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 395 | return 0; |
| 396 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 397 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 398 | sb = (bitmap_super_t *)kmap(bitmap->sb_page); |
| 399 | sb->events = cpu_to_le64(bitmap->mddev->events); |
| 400 | if (!bitmap->mddev->degraded) |
| 401 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); |
| 402 | kunmap(bitmap->sb_page); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 403 | return write_page(bitmap, bitmap->sb_page, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 404 | } |
| 405 | |
| 406 | /* print out the bitmap file superblock */ |
| 407 | void bitmap_print_sb(struct bitmap *bitmap) |
| 408 | { |
| 409 | bitmap_super_t *sb; |
| 410 | |
| 411 | if (!bitmap || !bitmap->sb_page) |
| 412 | return; |
| 413 | sb = (bitmap_super_t *)kmap(bitmap->sb_page); |
| 414 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 415 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
| 416 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); |
| 417 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 418 | *(__u32 *)(sb->uuid+0), |
| 419 | *(__u32 *)(sb->uuid+4), |
| 420 | *(__u32 *)(sb->uuid+8), |
| 421 | *(__u32 *)(sb->uuid+12)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 422 | printk(KERN_DEBUG " events: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 423 | (unsigned long long) le64_to_cpu(sb->events)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 424 | printk(KERN_DEBUG "events cleared: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 425 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 426 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
| 427 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); |
| 428 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); |
| 429 | printk(KERN_DEBUG " sync size: %llu KB\n", |
| 430 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 431 | kunmap(bitmap->sb_page); |
| 432 | } |
| 433 | |
| 434 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
| 435 | static int bitmap_read_sb(struct bitmap *bitmap) |
| 436 | { |
| 437 | char *reason = NULL; |
| 438 | bitmap_super_t *sb; |
| 439 | unsigned long chunksize, daemon_sleep; |
| 440 | unsigned long bytes_read; |
| 441 | unsigned long long events; |
| 442 | int err = -EINVAL; |
| 443 | |
| 444 | /* page 0 is the superblock, read it... */ |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 445 | if (bitmap->file) |
| 446 | bitmap->sb_page = read_page(bitmap->file, 0, &bytes_read); |
| 447 | else { |
| 448 | bitmap->sb_page = read_sb_page(bitmap->mddev, bitmap->offset, 0); |
| 449 | bytes_read = PAGE_SIZE; |
| 450 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 451 | if (IS_ERR(bitmap->sb_page)) { |
| 452 | err = PTR_ERR(bitmap->sb_page); |
| 453 | bitmap->sb_page = NULL; |
| 454 | return err; |
| 455 | } |
| 456 | |
| 457 | sb = (bitmap_super_t *)kmap(bitmap->sb_page); |
| 458 | |
| 459 | if (bytes_read < sizeof(*sb)) { /* short read */ |
| 460 | printk(KERN_INFO "%s: bitmap file superblock truncated\n", |
| 461 | bmname(bitmap)); |
| 462 | err = -ENOSPC; |
| 463 | goto out; |
| 464 | } |
| 465 | |
| 466 | chunksize = le32_to_cpu(sb->chunksize); |
| 467 | daemon_sleep = le32_to_cpu(sb->daemon_sleep); |
| 468 | |
| 469 | /* verify that the bitmap-specific fields are valid */ |
| 470 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) |
| 471 | reason = "bad magic"; |
| 472 | else if (sb->version != cpu_to_le32(BITMAP_MAJOR)) |
| 473 | reason = "unrecognized superblock version"; |
| 474 | else if (chunksize < 512 || chunksize > (1024 * 1024 * 4)) |
| 475 | reason = "bitmap chunksize out of range (512B - 4MB)"; |
| 476 | else if ((1 << ffz(~chunksize)) != chunksize) |
| 477 | reason = "bitmap chunksize not a power of 2"; |
| 478 | else if (daemon_sleep < 1 || daemon_sleep > 15) |
| 479 | reason = "daemon sleep period out of range"; |
| 480 | if (reason) { |
| 481 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", |
| 482 | bmname(bitmap), reason); |
| 483 | goto out; |
| 484 | } |
| 485 | |
| 486 | /* keep the array size field of the bitmap superblock up to date */ |
| 487 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 488 | |
| 489 | if (!bitmap->mddev->persistent) |
| 490 | goto success; |
| 491 | |
| 492 | /* |
| 493 | * if we have a persistent array superblock, compare the |
| 494 | * bitmap's UUID and event counter to the mddev's |
| 495 | */ |
| 496 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { |
| 497 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", |
| 498 | bmname(bitmap)); |
| 499 | goto out; |
| 500 | } |
| 501 | events = le64_to_cpu(sb->events); |
| 502 | if (events < bitmap->mddev->events) { |
| 503 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " |
| 504 | "-- forcing full recovery\n", bmname(bitmap), events, |
| 505 | (unsigned long long) bitmap->mddev->events); |
| 506 | sb->state |= BITMAP_STALE; |
| 507 | } |
| 508 | success: |
| 509 | /* assign fields using values from superblock */ |
| 510 | bitmap->chunksize = chunksize; |
| 511 | bitmap->daemon_sleep = daemon_sleep; |
| 512 | bitmap->flags |= sb->state; |
| 513 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
| 514 | err = 0; |
| 515 | out: |
| 516 | kunmap(bitmap->sb_page); |
| 517 | if (err) |
| 518 | bitmap_print_sb(bitmap); |
| 519 | return err; |
| 520 | } |
| 521 | |
| 522 | enum bitmap_mask_op { |
| 523 | MASK_SET, |
| 524 | MASK_UNSET |
| 525 | }; |
| 526 | |
| 527 | /* record the state of the bitmap in the superblock */ |
| 528 | static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, |
| 529 | enum bitmap_mask_op op) |
| 530 | { |
| 531 | bitmap_super_t *sb; |
| 532 | unsigned long flags; |
| 533 | |
| 534 | spin_lock_irqsave(&bitmap->lock, flags); |
| 535 | if (!bitmap || !bitmap->sb_page) { /* can't set the state */ |
| 536 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 537 | return; |
| 538 | } |
| 539 | page_cache_get(bitmap->sb_page); |
| 540 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 541 | sb = (bitmap_super_t *)kmap(bitmap->sb_page); |
| 542 | switch (op) { |
| 543 | case MASK_SET: sb->state |= bits; |
| 544 | break; |
| 545 | case MASK_UNSET: sb->state &= ~bits; |
| 546 | break; |
| 547 | default: BUG(); |
| 548 | } |
| 549 | kunmap(bitmap->sb_page); |
| 550 | page_cache_release(bitmap->sb_page); |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * general bitmap file operations |
| 555 | */ |
| 556 | |
| 557 | /* calculate the index of the page that contains this bit */ |
| 558 | static inline unsigned long file_page_index(unsigned long chunk) |
| 559 | { |
| 560 | return CHUNK_BIT_OFFSET(chunk) >> PAGE_BIT_SHIFT; |
| 561 | } |
| 562 | |
| 563 | /* calculate the (bit) offset of this bit within a page */ |
| 564 | static inline unsigned long file_page_offset(unsigned long chunk) |
| 565 | { |
| 566 | return CHUNK_BIT_OFFSET(chunk) & (PAGE_BITS - 1); |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * return a pointer to the page in the filemap that contains the given bit |
| 571 | * |
| 572 | * this lookup is complicated by the fact that the bitmap sb might be exactly |
| 573 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page |
| 574 | * 0 or page 1 |
| 575 | */ |
| 576 | static inline struct page *filemap_get_page(struct bitmap *bitmap, |
| 577 | unsigned long chunk) |
| 578 | { |
| 579 | return bitmap->filemap[file_page_index(chunk) - file_page_index(0)]; |
| 580 | } |
| 581 | |
| 582 | |
| 583 | static void bitmap_file_unmap(struct bitmap *bitmap) |
| 584 | { |
| 585 | struct page **map, *sb_page; |
| 586 | unsigned long *attr; |
| 587 | int pages; |
| 588 | unsigned long flags; |
| 589 | |
| 590 | spin_lock_irqsave(&bitmap->lock, flags); |
| 591 | map = bitmap->filemap; |
| 592 | bitmap->filemap = NULL; |
| 593 | attr = bitmap->filemap_attr; |
| 594 | bitmap->filemap_attr = NULL; |
| 595 | pages = bitmap->file_pages; |
| 596 | bitmap->file_pages = 0; |
| 597 | sb_page = bitmap->sb_page; |
| 598 | bitmap->sb_page = NULL; |
| 599 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 600 | |
| 601 | while (pages--) |
| 602 | if (map[pages]->index != 0) /* 0 is sb_page, release it below */ |
| 603 | page_cache_release(map[pages]); |
| 604 | kfree(map); |
| 605 | kfree(attr); |
| 606 | |
| 607 | if (sb_page) |
| 608 | page_cache_release(sb_page); |
| 609 | } |
| 610 | |
| 611 | static void bitmap_stop_daemons(struct bitmap *bitmap); |
| 612 | |
| 613 | /* dequeue the next item in a page list -- don't call from irq context */ |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 614 | static struct page_list *dequeue_page(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 615 | { |
| 616 | struct page_list *item = NULL; |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 617 | struct list_head *head = &bitmap->complete_pages; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 618 | |
| 619 | spin_lock(&bitmap->write_lock); |
| 620 | if (list_empty(head)) |
| 621 | goto out; |
| 622 | item = list_entry(head->prev, struct page_list, list); |
| 623 | list_del(head->prev); |
| 624 | out: |
| 625 | spin_unlock(&bitmap->write_lock); |
| 626 | return item; |
| 627 | } |
| 628 | |
| 629 | static void drain_write_queues(struct bitmap *bitmap) |
| 630 | { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 631 | struct page_list *item; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 632 | |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 633 | while ((item = dequeue_page(bitmap))) { |
| 634 | /* don't bother to wait */ |
| 635 | page_cache_release(item->page); |
| 636 | mempool_free(item, bitmap->write_pool); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 637 | } |
| 638 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 639 | wake_up(&bitmap->write_wait); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 640 | } |
| 641 | |
| 642 | static void bitmap_file_put(struct bitmap *bitmap) |
| 643 | { |
| 644 | struct file *file; |
| 645 | struct inode *inode; |
| 646 | unsigned long flags; |
| 647 | |
| 648 | spin_lock_irqsave(&bitmap->lock, flags); |
| 649 | file = bitmap->file; |
| 650 | bitmap->file = NULL; |
| 651 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 652 | |
| 653 | bitmap_stop_daemons(bitmap); |
| 654 | |
| 655 | drain_write_queues(bitmap); |
| 656 | |
| 657 | bitmap_file_unmap(bitmap); |
| 658 | |
| 659 | if (file) { |
| 660 | inode = file->f_mapping->host; |
| 661 | spin_lock(&inode->i_lock); |
| 662 | atomic_set(&inode->i_writecount, 1); /* allow writes again */ |
| 663 | spin_unlock(&inode->i_lock); |
| 664 | fput(file); |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | |
| 669 | /* |
| 670 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file |
| 671 | * then it is no longer reliable, so we stop using it and we mark the file |
| 672 | * as failed in the superblock |
| 673 | */ |
| 674 | static void bitmap_file_kick(struct bitmap *bitmap) |
| 675 | { |
| 676 | char *path, *ptr = NULL; |
| 677 | |
| 678 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET); |
| 679 | bitmap_update_sb(bitmap); |
| 680 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 681 | if (bitmap->file) { |
| 682 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 683 | if (path) |
| 684 | ptr = file_path(bitmap->file, path, PAGE_SIZE); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 685 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 686 | printk(KERN_ALERT "%s: kicking failed bitmap file %s from array!\n", |
| 687 | bmname(bitmap), ptr ? ptr : ""); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 688 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 689 | kfree(path); |
| 690 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 691 | |
| 692 | bitmap_file_put(bitmap); |
| 693 | |
| 694 | return; |
| 695 | } |
| 696 | |
| 697 | enum bitmap_page_attr { |
| 698 | BITMAP_PAGE_DIRTY = 1, // there are set bits that need to be synced |
| 699 | BITMAP_PAGE_CLEAN = 2, // there are bits that might need to be cleared |
| 700 | BITMAP_PAGE_NEEDWRITE=4, // there are cleared bits that need to be synced |
| 701 | }; |
| 702 | |
| 703 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, |
| 704 | enum bitmap_page_attr attr) |
| 705 | { |
| 706 | bitmap->filemap_attr[page->index] |= attr; |
| 707 | } |
| 708 | |
| 709 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, |
| 710 | enum bitmap_page_attr attr) |
| 711 | { |
| 712 | bitmap->filemap_attr[page->index] &= ~attr; |
| 713 | } |
| 714 | |
| 715 | static inline unsigned long get_page_attr(struct bitmap *bitmap, struct page *page) |
| 716 | { |
| 717 | return bitmap->filemap_attr[page->index]; |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * bitmap_file_set_bit -- called before performing a write to the md device |
| 722 | * to set (and eventually sync) a particular bit in the bitmap file |
| 723 | * |
| 724 | * we set the bit immediately, then we record the page number so that |
| 725 | * when an unplug occurs, we can flush the dirty pages out to disk |
| 726 | */ |
| 727 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) |
| 728 | { |
| 729 | unsigned long bit; |
| 730 | struct page *page; |
| 731 | void *kaddr; |
| 732 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); |
| 733 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 734 | if (!bitmap->filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 735 | return; |
| 736 | } |
| 737 | |
| 738 | page = filemap_get_page(bitmap, chunk); |
| 739 | bit = file_page_offset(chunk); |
| 740 | |
| 741 | |
| 742 | /* make sure the page stays cached until it gets written out */ |
| 743 | if (! (get_page_attr(bitmap, page) & BITMAP_PAGE_DIRTY)) |
| 744 | page_cache_get(page); |
| 745 | |
| 746 | /* set the bit */ |
| 747 | kaddr = kmap_atomic(page, KM_USER0); |
| 748 | set_bit(bit, kaddr); |
| 749 | kunmap_atomic(kaddr, KM_USER0); |
| 750 | PRINTK("set file bit %lu page %lu\n", bit, page->index); |
| 751 | |
| 752 | /* record page number so it gets flushed to disk when unplug occurs */ |
| 753 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
| 754 | |
| 755 | } |
| 756 | |
| 757 | /* this gets called when the md device is ready to unplug its underlying |
| 758 | * (slave) device queues -- before we let any writes go down, we need to |
| 759 | * sync the dirty pages of the bitmap file to disk */ |
| 760 | int bitmap_unplug(struct bitmap *bitmap) |
| 761 | { |
| 762 | unsigned long i, attr, flags; |
| 763 | struct page *page; |
| 764 | int wait = 0; |
| 765 | |
| 766 | if (!bitmap) |
| 767 | return 0; |
| 768 | |
| 769 | /* look at each page to see if there are any set bits that need to be |
| 770 | * flushed out to disk */ |
| 771 | for (i = 0; i < bitmap->file_pages; i++) { |
| 772 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 773 | if (!bitmap->filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 774 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 775 | return 0; |
| 776 | } |
| 777 | page = bitmap->filemap[i]; |
| 778 | attr = get_page_attr(bitmap, page); |
| 779 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
| 780 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
| 781 | if ((attr & BITMAP_PAGE_DIRTY)) |
| 782 | wait = 1; |
| 783 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 784 | |
| 785 | if (attr & (BITMAP_PAGE_DIRTY | BITMAP_PAGE_NEEDWRITE)) |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 786 | if (write_page(bitmap, page, 0)) |
NeilBrown | bfb39fb | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 787 | return 1; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 788 | } |
| 789 | if (wait) { /* if any writes were performed, we need to wait on them */ |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 790 | if (bitmap->file) { |
| 791 | spin_lock_irq(&bitmap->write_lock); |
| 792 | wait_event_lock_irq(bitmap->write_wait, |
| 793 | list_empty(&bitmap->complete_pages), bitmap->write_lock, |
| 794 | wake_up_process(bitmap->writeback_daemon->tsk)); |
| 795 | spin_unlock_irq(&bitmap->write_lock); |
| 796 | } else |
| 797 | wait_event(bitmap->mddev->sb_wait, |
| 798 | atomic_read(&bitmap->mddev->pending_writes)==0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 799 | } |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 804 | unsigned long sectors, int in_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 805 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
| 806 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the |
| 807 | * memory mapping of the bitmap file |
| 808 | * Special cases: |
| 809 | * if there's no bitmap file, or if the bitmap file had been |
| 810 | * previously kicked from the array, we mark all the bits as |
| 811 | * 1's in order to cause a full resync. |
| 812 | */ |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 813 | static int bitmap_init_from_disk(struct bitmap *bitmap, int in_sync) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 814 | { |
| 815 | unsigned long i, chunks, index, oldindex, bit; |
| 816 | struct page *page = NULL, *oldpage = NULL; |
| 817 | unsigned long num_pages, bit_cnt = 0; |
| 818 | struct file *file; |
| 819 | unsigned long bytes, offset, dummy; |
| 820 | int outofdate; |
| 821 | int ret = -ENOSPC; |
| 822 | |
| 823 | chunks = bitmap->chunks; |
| 824 | file = bitmap->file; |
| 825 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 826 | BUG_ON(!file && !bitmap->offset); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 827 | |
| 828 | #if INJECT_FAULTS_3 |
| 829 | outofdate = 1; |
| 830 | #else |
| 831 | outofdate = bitmap->flags & BITMAP_STALE; |
| 832 | #endif |
| 833 | if (outofdate) |
| 834 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " |
| 835 | "recovery\n", bmname(bitmap)); |
| 836 | |
| 837 | bytes = (chunks + 7) / 8; |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 838 | |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 839 | num_pages = (bytes + sizeof(bitmap_super_t) + PAGE_SIZE - 1) / PAGE_SIZE; |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 840 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 841 | if (file && i_size_read(file->f_mapping->host) < bytes + sizeof(bitmap_super_t)) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 842 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
| 843 | bmname(bitmap), |
| 844 | (unsigned long) i_size_read(file->f_mapping->host), |
| 845 | bytes + sizeof(bitmap_super_t)); |
| 846 | goto out; |
| 847 | } |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 848 | |
| 849 | ret = -ENOMEM; |
| 850 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 851 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 852 | if (!bitmap->filemap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 853 | goto out; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 854 | |
| 855 | bitmap->filemap_attr = kmalloc(sizeof(long) * num_pages, GFP_KERNEL); |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 856 | if (!bitmap->filemap_attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 857 | goto out; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 858 | |
| 859 | memset(bitmap->filemap_attr, 0, sizeof(long) * num_pages); |
| 860 | |
| 861 | oldindex = ~0L; |
| 862 | |
| 863 | for (i = 0; i < chunks; i++) { |
| 864 | index = file_page_index(i); |
| 865 | bit = file_page_offset(i); |
| 866 | if (index != oldindex) { /* this is a new page, read it in */ |
| 867 | /* unmap the old page, we're done with it */ |
| 868 | if (oldpage != NULL) |
| 869 | kunmap(oldpage); |
| 870 | if (index == 0) { |
| 871 | /* |
| 872 | * if we're here then the superblock page |
| 873 | * contains some bits (PAGE_SIZE != sizeof sb) |
| 874 | * we've already read it in, so just use it |
| 875 | */ |
| 876 | page = bitmap->sb_page; |
| 877 | offset = sizeof(bitmap_super_t); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 878 | } else if (file) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 879 | page = read_page(file, index, &dummy); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 880 | offset = 0; |
| 881 | } else { |
| 882 | page = read_sb_page(bitmap->mddev, bitmap->offset, index); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 883 | offset = 0; |
| 884 | } |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 885 | if (IS_ERR(page)) { /* read error */ |
| 886 | ret = PTR_ERR(page); |
| 887 | goto out; |
| 888 | } |
| 889 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 890 | oldindex = index; |
| 891 | oldpage = page; |
| 892 | kmap(page); |
| 893 | |
| 894 | if (outofdate) { |
| 895 | /* |
| 896 | * if bitmap is out of date, dirty the |
| 897 | * whole page and write it out |
| 898 | */ |
| 899 | memset(page_address(page) + offset, 0xff, |
| 900 | PAGE_SIZE - offset); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 901 | ret = write_page(bitmap, page, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 902 | if (ret) { |
| 903 | kunmap(page); |
| 904 | /* release, page not in filemap yet */ |
| 905 | page_cache_release(page); |
| 906 | goto out; |
| 907 | } |
| 908 | } |
| 909 | |
| 910 | bitmap->filemap[bitmap->file_pages++] = page; |
| 911 | } |
| 912 | if (test_bit(bit, page_address(page))) { |
| 913 | /* if the disk bit is set, set the memory bit */ |
| 914 | bitmap_set_memory_bits(bitmap, |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 915 | i << CHUNK_BLOCK_SHIFT(bitmap), 1, in_sync); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 916 | bit_cnt++; |
| 917 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | /* everything went OK */ |
| 921 | ret = 0; |
| 922 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); |
| 923 | |
| 924 | if (page) /* unmap the last page */ |
| 925 | kunmap(page); |
| 926 | |
| 927 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
| 928 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); |
| 929 | md_wakeup_thread(bitmap->mddev->thread); |
| 930 | } |
| 931 | |
| 932 | out: |
| 933 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
| 934 | "read %lu/%lu pages, set %lu bits, status: %d\n", |
| 935 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, ret); |
| 936 | |
| 937 | return ret; |
| 938 | } |
| 939 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 940 | void bitmap_write_all(struct bitmap *bitmap) |
| 941 | { |
| 942 | /* We don't actually write all bitmap blocks here, |
| 943 | * just flag them as needing to be written |
| 944 | */ |
| 945 | |
| 946 | unsigned long chunks = bitmap->chunks; |
| 947 | unsigned long bytes = (chunks+7)/8 + sizeof(bitmap_super_t); |
| 948 | unsigned long num_pages = (bytes + PAGE_SIZE-1) / PAGE_SIZE; |
| 949 | while (num_pages--) |
| 950 | bitmap->filemap_attr[num_pages] |= BITMAP_PAGE_NEEDWRITE; |
| 951 | } |
| 952 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 953 | |
| 954 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
| 955 | { |
| 956 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); |
| 957 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 958 | bitmap->bp[page].count += inc; |
| 959 | /* |
| 960 | if (page == 0) printk("count page 0, offset %llu: %d gives %d\n", |
| 961 | (unsigned long long)offset, inc, bitmap->bp[page].count); |
| 962 | */ |
| 963 | bitmap_checkfree(bitmap, page); |
| 964 | } |
| 965 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
| 966 | sector_t offset, int *blocks, |
| 967 | int create); |
| 968 | |
| 969 | /* |
| 970 | * bitmap daemon -- periodically wakes up to clean bits and flush pages |
| 971 | * out to disk |
| 972 | */ |
| 973 | |
| 974 | int bitmap_daemon_work(struct bitmap *bitmap) |
| 975 | { |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 976 | unsigned long j; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 977 | unsigned long flags; |
| 978 | struct page *page = NULL, *lastpage = NULL; |
| 979 | int err = 0; |
| 980 | int blocks; |
| 981 | int attr; |
| 982 | |
| 983 | if (bitmap == NULL) |
| 984 | return 0; |
| 985 | if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ)) |
| 986 | return 0; |
| 987 | bitmap->daemon_lastrun = jiffies; |
| 988 | |
| 989 | for (j = 0; j < bitmap->chunks; j++) { |
| 990 | bitmap_counter_t *bmc; |
| 991 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 992 | if (!bitmap->filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 993 | /* error or shutdown */ |
| 994 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 995 | break; |
| 996 | } |
| 997 | |
| 998 | page = filemap_get_page(bitmap, j); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 999 | |
| 1000 | if (page != lastpage) { |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1001 | /* skip this page unless it's marked as needing cleaning */ |
| 1002 | if (!((attr=get_page_attr(bitmap, page)) & BITMAP_PAGE_CLEAN)) { |
| 1003 | if (attr & BITMAP_PAGE_NEEDWRITE) { |
| 1004 | page_cache_get(page); |
| 1005 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
| 1006 | } |
| 1007 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1008 | if (attr & BITMAP_PAGE_NEEDWRITE) { |
| 1009 | if (write_page(bitmap, page, 0)) |
| 1010 | bitmap_file_kick(bitmap); |
| 1011 | page_cache_release(page); |
| 1012 | } |
| 1013 | continue; |
| 1014 | } |
| 1015 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1016 | /* grab the new page, sync and release the old */ |
| 1017 | page_cache_get(page); |
| 1018 | if (lastpage != NULL) { |
| 1019 | if (get_page_attr(bitmap, lastpage) & BITMAP_PAGE_NEEDWRITE) { |
| 1020 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1021 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1022 | err = write_page(bitmap, lastpage, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1023 | } else { |
| 1024 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1025 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1026 | } |
| 1027 | kunmap(lastpage); |
| 1028 | page_cache_release(lastpage); |
| 1029 | if (err) |
| 1030 | bitmap_file_kick(bitmap); |
| 1031 | } else |
| 1032 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1033 | lastpage = page; |
| 1034 | kmap(page); |
| 1035 | /* |
| 1036 | printk("bitmap clean at page %lu\n", j); |
| 1037 | */ |
| 1038 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1039 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
| 1040 | } |
| 1041 | bmc = bitmap_get_counter(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), |
| 1042 | &blocks, 0); |
| 1043 | if (bmc) { |
| 1044 | /* |
| 1045 | if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc); |
| 1046 | */ |
| 1047 | if (*bmc == 2) { |
| 1048 | *bmc=1; /* maybe clear the bit next time */ |
| 1049 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
| 1050 | } else if (*bmc == 1) { |
| 1051 | /* we can clear the bit */ |
| 1052 | *bmc = 0; |
| 1053 | bitmap_count_page(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), |
| 1054 | -1); |
| 1055 | |
| 1056 | /* clear the bit */ |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1057 | clear_bit(file_page_offset(j), page_address(page)); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1058 | } |
| 1059 | } |
| 1060 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1061 | } |
| 1062 | |
| 1063 | /* now sync the final page */ |
| 1064 | if (lastpage != NULL) { |
| 1065 | kunmap(lastpage); |
| 1066 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1067 | if (get_page_attr(bitmap, lastpage) &BITMAP_PAGE_NEEDWRITE) { |
| 1068 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1069 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1070 | err = write_page(bitmap, lastpage, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1071 | } else { |
| 1072 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1073 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1074 | } |
| 1075 | |
| 1076 | page_cache_release(lastpage); |
| 1077 | } |
| 1078 | |
| 1079 | return err; |
| 1080 | } |
| 1081 | |
| 1082 | static void daemon_exit(struct bitmap *bitmap, mdk_thread_t **daemon) |
| 1083 | { |
| 1084 | mdk_thread_t *dmn; |
| 1085 | unsigned long flags; |
| 1086 | |
| 1087 | /* if no one is waiting on us, we'll free the md thread struct |
| 1088 | * and exit, otherwise we let the waiter clean things up */ |
| 1089 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1090 | if ((dmn = *daemon)) { /* no one is waiting, cleanup and exit */ |
| 1091 | *daemon = NULL; |
| 1092 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1093 | kfree(dmn); |
| 1094 | complete_and_exit(NULL, 0); /* do_exit not exported */ |
| 1095 | } |
| 1096 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1097 | } |
| 1098 | |
| 1099 | static void bitmap_writeback_daemon(mddev_t *mddev) |
| 1100 | { |
| 1101 | struct bitmap *bitmap = mddev->bitmap; |
| 1102 | struct page *page; |
| 1103 | struct page_list *item; |
| 1104 | int err = 0; |
| 1105 | |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1106 | if (signal_pending(current)) { |
| 1107 | printk(KERN_INFO |
| 1108 | "%s: bitmap writeback daemon got signal, exiting...\n", |
| 1109 | bmname(bitmap)); |
| 1110 | err = -EINTR; |
| 1111 | goto out; |
| 1112 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1113 | |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1114 | PRINTK("%s: bitmap writeback daemon woke up...\n", bmname(bitmap)); |
| 1115 | /* wait on bitmap page writebacks */ |
| 1116 | while ((item = dequeue_page(bitmap))) { |
| 1117 | page = item->page; |
| 1118 | mempool_free(item, bitmap->write_pool); |
| 1119 | PRINTK("wait on page writeback: %p\n", page); |
| 1120 | wait_on_page_writeback(page); |
| 1121 | PRINTK("finished page writeback: %p\n", page); |
| 1122 | |
| 1123 | err = PageError(page); |
| 1124 | page_cache_release(page); |
| 1125 | if (err) { |
| 1126 | printk(KERN_WARNING "%s: bitmap file writeback " |
| 1127 | "failed (page %lu): %d\n", |
| 1128 | bmname(bitmap), page->index, err); |
| 1129 | bitmap_file_kick(bitmap); |
| 1130 | goto out; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1131 | } |
| 1132 | } |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1133 | out: |
| 1134 | wake_up(&bitmap->write_wait); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1135 | if (err) { |
| 1136 | printk(KERN_INFO "%s: bitmap writeback daemon exiting (%d)\n", |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1137 | bmname(bitmap), err); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1138 | daemon_exit(bitmap, &bitmap->writeback_daemon); |
| 1139 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1140 | } |
| 1141 | |
| 1142 | static int bitmap_start_daemon(struct bitmap *bitmap, mdk_thread_t **ptr, |
| 1143 | void (*func)(mddev_t *), char *name) |
| 1144 | { |
| 1145 | mdk_thread_t *daemon; |
| 1146 | unsigned long flags; |
| 1147 | char namebuf[32]; |
| 1148 | |
| 1149 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1150 | *ptr = NULL; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 1151 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1152 | if (!bitmap->file) /* no need for daemon if there's no backing file */ |
| 1153 | goto out_unlock; |
| 1154 | |
| 1155 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1156 | |
| 1157 | #if INJECT_FATAL_FAULT_2 |
| 1158 | daemon = NULL; |
| 1159 | #else |
| 1160 | sprintf(namebuf, "%%s_%s", name); |
| 1161 | daemon = md_register_thread(func, bitmap->mddev, namebuf); |
| 1162 | #endif |
| 1163 | if (!daemon) { |
| 1164 | printk(KERN_ERR "%s: failed to start bitmap daemon\n", |
| 1165 | bmname(bitmap)); |
| 1166 | return -ECHILD; |
| 1167 | } |
| 1168 | |
| 1169 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1170 | *ptr = daemon; |
| 1171 | |
| 1172 | md_wakeup_thread(daemon); /* start it running */ |
| 1173 | |
| 1174 | PRINTK("%s: %s daemon (pid %d) started...\n", |
NeilBrown | d80a138 | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 1175 | bmname(bitmap), name, daemon->tsk->pid); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1176 | out_unlock: |
| 1177 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1178 | return 0; |
| 1179 | } |
| 1180 | |
| 1181 | static int bitmap_start_daemons(struct bitmap *bitmap) |
| 1182 | { |
| 1183 | int err = bitmap_start_daemon(bitmap, &bitmap->writeback_daemon, |
| 1184 | bitmap_writeback_daemon, "bitmap_wb"); |
| 1185 | return err; |
| 1186 | } |
| 1187 | |
| 1188 | static void bitmap_stop_daemon(struct bitmap *bitmap, mdk_thread_t **ptr) |
| 1189 | { |
| 1190 | mdk_thread_t *daemon; |
| 1191 | unsigned long flags; |
| 1192 | |
| 1193 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1194 | daemon = *ptr; |
| 1195 | *ptr = NULL; |
| 1196 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1197 | if (daemon) |
| 1198 | md_unregister_thread(daemon); /* destroy the thread */ |
| 1199 | } |
| 1200 | |
| 1201 | static void bitmap_stop_daemons(struct bitmap *bitmap) |
| 1202 | { |
| 1203 | /* the daemons can't stop themselves... they'll just exit instead... */ |
| 1204 | if (bitmap->writeback_daemon && |
| 1205 | current->pid != bitmap->writeback_daemon->tsk->pid) |
| 1206 | bitmap_stop_daemon(bitmap, &bitmap->writeback_daemon); |
| 1207 | } |
| 1208 | |
| 1209 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
| 1210 | sector_t offset, int *blocks, |
| 1211 | int create) |
| 1212 | { |
| 1213 | /* If 'create', we might release the lock and reclaim it. |
| 1214 | * The lock must have been taken with interrupts enabled. |
| 1215 | * If !create, we don't release the lock. |
| 1216 | */ |
| 1217 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); |
| 1218 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1219 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; |
| 1220 | sector_t csize; |
| 1221 | |
| 1222 | if (bitmap_checkpage(bitmap, page, create) < 0) { |
| 1223 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); |
| 1224 | *blocks = csize - (offset & (csize- 1)); |
| 1225 | return NULL; |
| 1226 | } |
| 1227 | /* now locked ... */ |
| 1228 | |
| 1229 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ |
| 1230 | /* should we use the first or second counter field |
| 1231 | * of the hijacked pointer? */ |
| 1232 | int hi = (pageoff > PAGE_COUNTER_MASK); |
| 1233 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + |
| 1234 | PAGE_COUNTER_SHIFT - 1); |
| 1235 | *blocks = csize - (offset & (csize- 1)); |
| 1236 | return &((bitmap_counter_t *) |
| 1237 | &bitmap->bp[page].map)[hi]; |
| 1238 | } else { /* page is allocated */ |
| 1239 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); |
| 1240 | *blocks = csize - (offset & (csize- 1)); |
| 1241 | return (bitmap_counter_t *) |
| 1242 | &(bitmap->bp[page].map[pageoff]); |
| 1243 | } |
| 1244 | } |
| 1245 | |
| 1246 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors) |
| 1247 | { |
| 1248 | if (!bitmap) return 0; |
| 1249 | while (sectors) { |
| 1250 | int blocks; |
| 1251 | bitmap_counter_t *bmc; |
| 1252 | |
| 1253 | spin_lock_irq(&bitmap->lock); |
| 1254 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); |
| 1255 | if (!bmc) { |
| 1256 | spin_unlock_irq(&bitmap->lock); |
| 1257 | return 0; |
| 1258 | } |
| 1259 | |
| 1260 | switch(*bmc) { |
| 1261 | case 0: |
| 1262 | bitmap_file_set_bit(bitmap, offset); |
| 1263 | bitmap_count_page(bitmap,offset, 1); |
| 1264 | blk_plug_device(bitmap->mddev->queue); |
| 1265 | /* fall through */ |
| 1266 | case 1: |
| 1267 | *bmc = 2; |
| 1268 | } |
| 1269 | if ((*bmc & COUNTER_MAX) == COUNTER_MAX) BUG(); |
| 1270 | (*bmc)++; |
| 1271 | |
| 1272 | spin_unlock_irq(&bitmap->lock); |
| 1273 | |
| 1274 | offset += blocks; |
| 1275 | if (sectors > blocks) |
| 1276 | sectors -= blocks; |
| 1277 | else sectors = 0; |
| 1278 | } |
| 1279 | return 0; |
| 1280 | } |
| 1281 | |
| 1282 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, |
| 1283 | int success) |
| 1284 | { |
| 1285 | if (!bitmap) return; |
| 1286 | while (sectors) { |
| 1287 | int blocks; |
| 1288 | unsigned long flags; |
| 1289 | bitmap_counter_t *bmc; |
| 1290 | |
| 1291 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1292 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); |
| 1293 | if (!bmc) { |
| 1294 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1295 | return; |
| 1296 | } |
| 1297 | |
| 1298 | if (!success && ! (*bmc & NEEDED_MASK)) |
| 1299 | *bmc |= NEEDED_MASK; |
| 1300 | |
| 1301 | (*bmc)--; |
| 1302 | if (*bmc <= 2) { |
| 1303 | set_page_attr(bitmap, |
| 1304 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), |
| 1305 | BITMAP_PAGE_CLEAN); |
| 1306 | } |
| 1307 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1308 | offset += blocks; |
| 1309 | if (sectors > blocks) |
| 1310 | sectors -= blocks; |
| 1311 | else sectors = 0; |
| 1312 | } |
| 1313 | } |
| 1314 | |
| 1315 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks) |
| 1316 | { |
| 1317 | bitmap_counter_t *bmc; |
| 1318 | int rv; |
| 1319 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ |
| 1320 | *blocks = 1024; |
| 1321 | return 1; /* always resync if no bitmap */ |
| 1322 | } |
| 1323 | spin_lock_irq(&bitmap->lock); |
| 1324 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1325 | rv = 0; |
| 1326 | if (bmc) { |
| 1327 | /* locked */ |
| 1328 | if (RESYNC(*bmc)) |
| 1329 | rv = 1; |
| 1330 | else if (NEEDED(*bmc)) { |
| 1331 | rv = 1; |
| 1332 | *bmc |= RESYNC_MASK; |
| 1333 | *bmc &= ~NEEDED_MASK; |
| 1334 | } |
| 1335 | } |
| 1336 | spin_unlock_irq(&bitmap->lock); |
| 1337 | return rv; |
| 1338 | } |
| 1339 | |
| 1340 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted) |
| 1341 | { |
| 1342 | bitmap_counter_t *bmc; |
| 1343 | unsigned long flags; |
| 1344 | /* |
| 1345 | if (offset == 0) printk("bitmap_end_sync 0 (%d)\n", aborted); |
| 1346 | */ if (bitmap == NULL) { |
| 1347 | *blocks = 1024; |
| 1348 | return; |
| 1349 | } |
| 1350 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1351 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1352 | if (bmc == NULL) |
| 1353 | goto unlock; |
| 1354 | /* locked */ |
| 1355 | /* |
| 1356 | if (offset == 0) printk("bitmap_end sync found 0x%x, blocks %d\n", *bmc, *blocks); |
| 1357 | */ |
| 1358 | if (RESYNC(*bmc)) { |
| 1359 | *bmc &= ~RESYNC_MASK; |
| 1360 | |
| 1361 | if (!NEEDED(*bmc) && aborted) |
| 1362 | *bmc |= NEEDED_MASK; |
| 1363 | else { |
| 1364 | if (*bmc <= 2) { |
| 1365 | set_page_attr(bitmap, |
| 1366 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), |
| 1367 | BITMAP_PAGE_CLEAN); |
| 1368 | } |
| 1369 | } |
| 1370 | } |
| 1371 | unlock: |
| 1372 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1373 | } |
| 1374 | |
| 1375 | void bitmap_close_sync(struct bitmap *bitmap) |
| 1376 | { |
| 1377 | /* Sync has finished, and any bitmap chunks that weren't synced |
| 1378 | * properly have been aborted. It remains to us to clear the |
| 1379 | * RESYNC bit wherever it is still on |
| 1380 | */ |
| 1381 | sector_t sector = 0; |
| 1382 | int blocks; |
| 1383 | if (!bitmap) return; |
| 1384 | while (sector < bitmap->mddev->resync_max_sectors) { |
| 1385 | bitmap_end_sync(bitmap, sector, &blocks, 0); |
| 1386 | /* |
| 1387 | if (sector < 500) printk("bitmap_close_sync: sec %llu blks %d\n", |
| 1388 | (unsigned long long)sector, blocks); |
| 1389 | */ sector += blocks; |
| 1390 | } |
| 1391 | } |
| 1392 | |
| 1393 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 1394 | unsigned long sectors, int in_sync) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1395 | { |
| 1396 | /* For each chunk covered by any of these sectors, set the |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 1397 | * counter to 1 and set resync_needed unless in_sync. They should all |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1398 | * be 0 at this point |
| 1399 | */ |
| 1400 | while (sectors) { |
| 1401 | int secs; |
| 1402 | bitmap_counter_t *bmc; |
| 1403 | spin_lock_irq(&bitmap->lock); |
| 1404 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); |
| 1405 | if (!bmc) { |
| 1406 | spin_unlock_irq(&bitmap->lock); |
| 1407 | return; |
| 1408 | } |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 1409 | if (! *bmc) { |
| 1410 | struct page *page; |
| 1411 | *bmc = 1 | (in_sync? 0 : NEEDED_MASK); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1412 | bitmap_count_page(bitmap, offset, 1); |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 1413 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); |
| 1414 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1415 | } |
| 1416 | spin_unlock_irq(&bitmap->lock); |
| 1417 | if (sectors > secs) |
| 1418 | sectors -= secs; |
| 1419 | else |
| 1420 | sectors = 0; |
| 1421 | } |
| 1422 | } |
| 1423 | |
| 1424 | /* dirty the entire bitmap */ |
| 1425 | int bitmap_setallbits(struct bitmap *bitmap) |
| 1426 | { |
| 1427 | unsigned long flags; |
| 1428 | unsigned long j; |
| 1429 | |
| 1430 | /* dirty the in-memory bitmap */ |
| 1431 | bitmap_set_memory_bits(bitmap, 0, bitmap->chunks << CHUNK_BLOCK_SHIFT(bitmap), 1); |
| 1432 | |
| 1433 | /* dirty the bitmap file */ |
| 1434 | for (j = 0; j < bitmap->file_pages; j++) { |
| 1435 | struct page *page = bitmap->filemap[j]; |
| 1436 | |
| 1437 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1438 | page_cache_get(page); |
| 1439 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1440 | memset(kmap(page), 0xff, PAGE_SIZE); |
| 1441 | kunmap(page); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1442 | if (write_page(bitmap, page, 0)) |
NeilBrown | bfb39fb | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 1443 | return 1; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1444 | } |
| 1445 | |
| 1446 | return 0; |
| 1447 | } |
| 1448 | |
| 1449 | /* |
| 1450 | * free memory that was allocated |
| 1451 | */ |
| 1452 | void bitmap_destroy(mddev_t *mddev) |
| 1453 | { |
| 1454 | unsigned long k, pages; |
| 1455 | struct bitmap_page *bp; |
| 1456 | struct bitmap *bitmap = mddev->bitmap; |
| 1457 | |
| 1458 | if (!bitmap) /* there was no bitmap */ |
| 1459 | return; |
| 1460 | |
| 1461 | mddev->bitmap = NULL; /* disconnect from the md device */ |
| 1462 | |
| 1463 | /* release the bitmap file and kill the daemon */ |
| 1464 | bitmap_file_put(bitmap); |
| 1465 | |
| 1466 | bp = bitmap->bp; |
| 1467 | pages = bitmap->pages; |
| 1468 | |
| 1469 | /* free all allocated memory */ |
| 1470 | |
| 1471 | mempool_destroy(bitmap->write_pool); |
| 1472 | |
| 1473 | if (bp) /* deallocate the page memory */ |
| 1474 | for (k = 0; k < pages; k++) |
| 1475 | if (bp[k].map && !bp[k].hijacked) |
| 1476 | kfree(bp[k].map); |
| 1477 | kfree(bp); |
| 1478 | kfree(bitmap); |
| 1479 | } |
| 1480 | |
| 1481 | /* |
| 1482 | * initialize the bitmap structure |
| 1483 | * if this returns an error, bitmap_destroy must be called to do clean up |
| 1484 | */ |
| 1485 | int bitmap_create(mddev_t *mddev) |
| 1486 | { |
| 1487 | struct bitmap *bitmap; |
| 1488 | unsigned long blocks = mddev->resync_max_sectors; |
| 1489 | unsigned long chunks; |
| 1490 | unsigned long pages; |
| 1491 | struct file *file = mddev->bitmap_file; |
| 1492 | int err; |
| 1493 | |
| 1494 | BUG_ON(sizeof(bitmap_super_t) != 256); |
| 1495 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 1496 | if (!file && !mddev->bitmap_offset) /* bitmap disabled, nothing to do */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1497 | return 0; |
| 1498 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 1499 | BUG_ON(file && mddev->bitmap_offset); |
| 1500 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1501 | bitmap = kmalloc(sizeof(*bitmap), GFP_KERNEL); |
| 1502 | if (!bitmap) |
| 1503 | return -ENOMEM; |
| 1504 | |
| 1505 | memset(bitmap, 0, sizeof(*bitmap)); |
| 1506 | |
| 1507 | spin_lock_init(&bitmap->lock); |
| 1508 | bitmap->mddev = mddev; |
| 1509 | mddev->bitmap = bitmap; |
| 1510 | |
| 1511 | spin_lock_init(&bitmap->write_lock); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1512 | INIT_LIST_HEAD(&bitmap->complete_pages); |
| 1513 | init_waitqueue_head(&bitmap->write_wait); |
| 1514 | bitmap->write_pool = mempool_create(WRITE_POOL_SIZE, write_pool_alloc, |
| 1515 | write_pool_free, NULL); |
| 1516 | if (!bitmap->write_pool) |
| 1517 | return -ENOMEM; |
| 1518 | |
| 1519 | bitmap->file = file; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame^] | 1520 | bitmap->offset = mddev->bitmap_offset; |
| 1521 | if (file) get_file(file); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1522 | /* read superblock from bitmap file (this sets bitmap->chunksize) */ |
| 1523 | err = bitmap_read_sb(bitmap); |
| 1524 | if (err) |
| 1525 | return err; |
| 1526 | |
| 1527 | bitmap->chunkshift = find_first_bit(&bitmap->chunksize, |
| 1528 | sizeof(bitmap->chunksize)); |
| 1529 | |
| 1530 | /* now that chunksize and chunkshift are set, we can use these macros */ |
| 1531 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) / |
| 1532 | CHUNK_BLOCK_RATIO(bitmap); |
| 1533 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
| 1534 | |
| 1535 | BUG_ON(!pages); |
| 1536 | |
| 1537 | bitmap->chunks = chunks; |
| 1538 | bitmap->pages = pages; |
| 1539 | bitmap->missing_pages = pages; |
| 1540 | bitmap->counter_bits = COUNTER_BITS; |
| 1541 | |
| 1542 | bitmap->syncchunk = ~0UL; |
| 1543 | |
| 1544 | #if INJECT_FATAL_FAULT_1 |
| 1545 | bitmap->bp = NULL; |
| 1546 | #else |
| 1547 | bitmap->bp = kmalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
| 1548 | #endif |
| 1549 | if (!bitmap->bp) |
| 1550 | return -ENOMEM; |
| 1551 | memset(bitmap->bp, 0, pages * sizeof(*bitmap->bp)); |
| 1552 | |
| 1553 | bitmap->flags |= BITMAP_ACTIVE; |
| 1554 | |
| 1555 | /* now that we have some pages available, initialize the in-memory |
| 1556 | * bitmap from the on-disk bitmap */ |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 1557 | err = bitmap_init_from_disk(bitmap, mddev->recovery_cp == MaxSector); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1558 | if (err) |
| 1559 | return err; |
| 1560 | |
| 1561 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
| 1562 | pages, bmname(bitmap)); |
| 1563 | |
| 1564 | /* kick off the bitmap daemons */ |
| 1565 | err = bitmap_start_daemons(bitmap); |
| 1566 | if (err) |
| 1567 | return err; |
| 1568 | return bitmap_update_sb(bitmap); |
| 1569 | } |
| 1570 | |
| 1571 | /* the bitmap API -- for raid personalities */ |
| 1572 | EXPORT_SYMBOL(bitmap_startwrite); |
| 1573 | EXPORT_SYMBOL(bitmap_endwrite); |
| 1574 | EXPORT_SYMBOL(bitmap_start_sync); |
| 1575 | EXPORT_SYMBOL(bitmap_end_sync); |
| 1576 | EXPORT_SYMBOL(bitmap_unplug); |
| 1577 | EXPORT_SYMBOL(bitmap_close_sync); |
| 1578 | EXPORT_SYMBOL(bitmap_daemon_work); |