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 |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 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. |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 17 | */ |
| 18 | |
| 19 | #include <linux/module.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 20 | #include <linux/errno.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/init.h> |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 23 | #include <linux/timer.h> |
| 24 | #include <linux/sched.h> |
| 25 | #include <linux/list.h> |
| 26 | #include <linux/file.h> |
| 27 | #include <linux/mount.h> |
| 28 | #include <linux/buffer_head.h> |
| 29 | #include <linux/raid/md.h> |
| 30 | #include <linux/raid/bitmap.h> |
| 31 | |
| 32 | /* debug macros */ |
| 33 | |
| 34 | #define DEBUG 0 |
| 35 | |
| 36 | #if DEBUG |
| 37 | /* these are for debugging purposes only! */ |
| 38 | |
| 39 | /* define one and only one of these */ |
| 40 | #define INJECT_FAULTS_1 0 /* cause bitmap_alloc_page to fail always */ |
| 41 | #define INJECT_FAULTS_2 0 /* cause bitmap file to be kicked when first bit set*/ |
| 42 | #define INJECT_FAULTS_3 0 /* treat bitmap file as kicked at init time */ |
| 43 | #define INJECT_FAULTS_4 0 /* undef */ |
| 44 | #define INJECT_FAULTS_5 0 /* undef */ |
| 45 | #define INJECT_FAULTS_6 0 |
| 46 | |
| 47 | /* if these are defined, the driver will fail! debug only */ |
| 48 | #define INJECT_FATAL_FAULT_1 0 /* fail kmalloc, causing bitmap_create to fail */ |
| 49 | #define INJECT_FATAL_FAULT_2 0 /* undef */ |
| 50 | #define INJECT_FATAL_FAULT_3 0 /* undef */ |
| 51 | #endif |
| 52 | |
| 53 | //#define DPRINTK PRINTK /* set this NULL to avoid verbose debug output */ |
| 54 | #define DPRINTK(x...) do { } while(0) |
| 55 | |
| 56 | #ifndef PRINTK |
| 57 | # if DEBUG > 0 |
| 58 | # define PRINTK(x...) printk(KERN_DEBUG x) |
| 59 | # else |
| 60 | # define PRINTK(x...) |
| 61 | # endif |
| 62 | #endif |
| 63 | |
| 64 | static inline char * bmname(struct bitmap *bitmap) |
| 65 | { |
| 66 | return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; |
| 67 | } |
| 68 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 69 | |
| 70 | /* |
| 71 | * just a placeholder - calls kmalloc for bitmap pages |
| 72 | */ |
| 73 | static unsigned char *bitmap_alloc_page(struct bitmap *bitmap) |
| 74 | { |
| 75 | unsigned char *page; |
| 76 | |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 77 | #ifdef INJECT_FAULTS_1 |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 78 | page = NULL; |
| 79 | #else |
| 80 | page = kmalloc(PAGE_SIZE, GFP_NOIO); |
| 81 | #endif |
| 82 | if (!page) |
| 83 | printk("%s: bitmap_alloc_page FAILED\n", bmname(bitmap)); |
| 84 | else |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 85 | PRINTK("%s: bitmap_alloc_page: allocated page at %p\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 86 | bmname(bitmap), page); |
| 87 | return page; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * for now just a placeholder -- just calls kfree for bitmap pages |
| 92 | */ |
| 93 | static void bitmap_free_page(struct bitmap *bitmap, unsigned char *page) |
| 94 | { |
| 95 | PRINTK("%s: bitmap_free_page: free page %p\n", bmname(bitmap), page); |
| 96 | kfree(page); |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * check a page and, if necessary, allocate it (or hijack it if the alloc fails) |
| 101 | * |
| 102 | * 1) check to see if this page is allocated, if it's not then try to alloc |
| 103 | * 2) if the alloc fails, set the page's hijacked flag so we'll use the |
| 104 | * page pointer directly as a counter |
| 105 | * |
| 106 | * if we find our page, we increment the page's refcount so that it stays |
| 107 | * allocated while we're using it |
| 108 | */ |
| 109 | static int bitmap_checkpage(struct bitmap *bitmap, unsigned long page, int create) |
| 110 | { |
| 111 | unsigned char *mappage; |
| 112 | |
| 113 | if (page >= bitmap->pages) { |
| 114 | printk(KERN_ALERT |
| 115 | "%s: invalid bitmap page request: %lu (> %lu)\n", |
| 116 | bmname(bitmap), page, bitmap->pages-1); |
| 117 | return -EINVAL; |
| 118 | } |
| 119 | |
| 120 | |
| 121 | if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ |
| 122 | return 0; |
| 123 | |
| 124 | if (bitmap->bp[page].map) /* page is already allocated, just return */ |
| 125 | return 0; |
| 126 | |
| 127 | if (!create) |
| 128 | return -ENOENT; |
| 129 | |
| 130 | spin_unlock_irq(&bitmap->lock); |
| 131 | |
| 132 | /* this page has not been allocated yet */ |
| 133 | |
| 134 | if ((mappage = bitmap_alloc_page(bitmap)) == NULL) { |
| 135 | PRINTK("%s: bitmap map page allocation failed, hijacking\n", |
| 136 | bmname(bitmap)); |
| 137 | /* failed - set the hijacked flag so that we can use the |
| 138 | * pointer as a counter */ |
| 139 | spin_lock_irq(&bitmap->lock); |
| 140 | if (!bitmap->bp[page].map) |
| 141 | bitmap->bp[page].hijacked = 1; |
| 142 | goto out; |
| 143 | } |
| 144 | |
| 145 | /* got a page */ |
| 146 | |
| 147 | spin_lock_irq(&bitmap->lock); |
| 148 | |
| 149 | /* recheck the page */ |
| 150 | |
| 151 | if (bitmap->bp[page].map || bitmap->bp[page].hijacked) { |
| 152 | /* somebody beat us to getting the page */ |
| 153 | bitmap_free_page(bitmap, mappage); |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* no page was in place and we have one, so install it */ |
| 158 | |
| 159 | memset(mappage, 0, PAGE_SIZE); |
| 160 | bitmap->bp[page].map = mappage; |
| 161 | bitmap->missing_pages--; |
| 162 | out: |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | |
| 167 | /* if page is completely empty, put it back on the free list, or dealloc it */ |
| 168 | /* if page was hijacked, unmark the flag so it might get alloced next time */ |
| 169 | /* Note: lock should be held when calling this */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 170 | static void bitmap_checkfree(struct bitmap *bitmap, unsigned long page) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 171 | { |
| 172 | char *ptr; |
| 173 | |
| 174 | if (bitmap->bp[page].count) /* page is still busy */ |
| 175 | return; |
| 176 | |
| 177 | /* page is no longer in use, it can be released */ |
| 178 | |
| 179 | if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ |
| 180 | bitmap->bp[page].hijacked = 0; |
| 181 | bitmap->bp[page].map = NULL; |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | /* normal case, free the page */ |
| 186 | |
| 187 | #if 0 |
| 188 | /* actually ... let's not. We will probably need the page again exactly when |
| 189 | * memory is tight and we are flusing to disk |
| 190 | */ |
| 191 | return; |
| 192 | #else |
| 193 | ptr = bitmap->bp[page].map; |
| 194 | bitmap->bp[page].map = NULL; |
| 195 | bitmap->missing_pages++; |
| 196 | bitmap_free_page(bitmap, ptr); |
| 197 | return; |
| 198 | #endif |
| 199 | } |
| 200 | |
| 201 | |
| 202 | /* |
| 203 | * bitmap file handling - read and write the bitmap file and its superblock |
| 204 | */ |
| 205 | |
| 206 | /* copy the pathname of a file to a buffer */ |
| 207 | char *file_path(struct file *file, char *buf, int count) |
| 208 | { |
| 209 | struct dentry *d; |
| 210 | struct vfsmount *v; |
| 211 | |
| 212 | if (!buf) |
| 213 | return NULL; |
| 214 | |
Josef Sipek | c649bb9 | 2006-12-08 02:37:19 -0800 | [diff] [blame] | 215 | d = file->f_path.dentry; |
| 216 | v = file->f_path.mnt; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 217 | |
| 218 | buf = d_path(d, v, buf, count); |
| 219 | |
| 220 | return IS_ERR(buf) ? NULL : buf; |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * basic page I/O operations |
| 225 | */ |
| 226 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 227 | /* IO operations when bitmap is stored near all superblocks */ |
| 228 | static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long index) |
| 229 | { |
| 230 | /* choose a good rdev and read the page from there */ |
| 231 | |
| 232 | mdk_rdev_t *rdev; |
| 233 | struct list_head *tmp; |
| 234 | struct page *page = alloc_page(GFP_KERNEL); |
| 235 | sector_t target; |
| 236 | |
| 237 | if (!page) |
| 238 | return ERR_PTR(-ENOMEM); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 239 | |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 240 | ITERATE_RDEV(mddev, rdev, tmp) { |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 241 | if (! test_bit(In_sync, &rdev->flags) |
| 242 | || test_bit(Faulty, &rdev->flags)) |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 243 | continue; |
| 244 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 245 | target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512); |
| 246 | |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 247 | if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) { |
| 248 | page->index = index; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 249 | attach_page_buffers(page, NULL); /* so that free_buffer will |
| 250 | * quietly no-op */ |
NeilBrown | ab904d6 | 2005-09-09 16:23:52 -0700 | [diff] [blame] | 251 | return page; |
| 252 | } |
| 253 | } |
| 254 | return ERR_PTR(-EIO); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 255 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 256 | } |
| 257 | |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 258 | static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 259 | { |
| 260 | mdk_rdev_t *rdev; |
| 261 | struct list_head *tmp; |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 262 | mddev_t *mddev = bitmap->mddev; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 263 | |
| 264 | ITERATE_RDEV(mddev, rdev, tmp) |
NeilBrown | b2d444d | 2005-11-08 21:39:31 -0800 | [diff] [blame] | 265 | if (test_bit(In_sync, &rdev->flags) |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 266 | && !test_bit(Faulty, &rdev->flags)) { |
| 267 | int size = PAGE_SIZE; |
| 268 | if (page->index == bitmap->file_pages-1) |
| 269 | size = roundup(bitmap->last_page_size, |
| 270 | bdev_hardsect_size(rdev->bdev)); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 271 | md_super_write(mddev, rdev, |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 272 | (rdev->sb_offset<<1) + bitmap->offset |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 273 | + page->index * (PAGE_SIZE/512), |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 274 | size, |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 275 | page); |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 276 | } |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 277 | |
| 278 | if (wait) |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 279 | md_super_wait(mddev); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 280 | return 0; |
| 281 | } |
| 282 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 283 | /* |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 284 | * write out a page to a file |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 285 | */ |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 286 | static int write_page(struct bitmap *bitmap, struct page *page, int wait) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 287 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 288 | struct buffer_head *bh; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 289 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 290 | if (bitmap->file == NULL) |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 291 | return write_sb_page(bitmap, page, wait); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 292 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 293 | bh = page_buffers(page); |
NeilBrown | c708443 | 2006-01-06 00:20:45 -0800 | [diff] [blame] | 294 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 295 | while (bh && bh->b_blocknr) { |
| 296 | atomic_inc(&bitmap->pending_writes); |
| 297 | set_buffer_locked(bh); |
| 298 | set_buffer_mapped(bh); |
| 299 | submit_bh(WRITE, bh); |
| 300 | bh = bh->b_this_page; |
NeilBrown | 8a5e9cf | 2005-06-21 17:17:29 -0700 | [diff] [blame] | 301 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 302 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 303 | if (wait) { |
| 304 | wait_event(bitmap->write_wait, |
| 305 | atomic_read(&bitmap->pending_writes)==0); |
| 306 | return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 307 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 308 | return 0; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 309 | } |
| 310 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 311 | static void end_bitmap_write(struct buffer_head *bh, int uptodate) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 312 | { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 313 | struct bitmap *bitmap = bh->b_private; |
| 314 | unsigned long flags; |
| 315 | |
| 316 | if (!uptodate) { |
| 317 | spin_lock_irqsave(&bitmap->lock, flags); |
| 318 | bitmap->flags |= BITMAP_WRITE_ERROR; |
| 319 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 320 | } |
| 321 | if (atomic_dec_and_test(&bitmap->pending_writes)) |
| 322 | wake_up(&bitmap->write_wait); |
| 323 | } |
| 324 | |
| 325 | /* copied from buffer.c */ |
| 326 | static void |
| 327 | __clear_page_buffers(struct page *page) |
| 328 | { |
| 329 | ClearPagePrivate(page); |
| 330 | set_page_private(page, 0); |
| 331 | page_cache_release(page); |
| 332 | } |
| 333 | static void free_buffers(struct page *page) |
| 334 | { |
| 335 | struct buffer_head *bh = page_buffers(page); |
| 336 | |
| 337 | while (bh) { |
| 338 | struct buffer_head *next = bh->b_this_page; |
| 339 | free_buffer_head(bh); |
| 340 | bh = next; |
| 341 | } |
| 342 | __clear_page_buffers(page); |
| 343 | put_page(page); |
| 344 | } |
| 345 | |
| 346 | /* read a page from a file. |
| 347 | * We both read the page, and attach buffers to the page to record the |
| 348 | * address of each block (using bmap). These addresses will be used |
| 349 | * to write the block later, completely bypassing the filesystem. |
| 350 | * This usage is similar to how swap files are handled, and allows us |
| 351 | * to write to a file with no concerns of memory allocation failing. |
| 352 | */ |
| 353 | static struct page *read_page(struct file *file, unsigned long index, |
| 354 | struct bitmap *bitmap, |
| 355 | unsigned long count) |
| 356 | { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 357 | struct page *page = NULL; |
Josef Sipek | c649bb9 | 2006-12-08 02:37:19 -0800 | [diff] [blame] | 358 | struct inode *inode = file->f_path.dentry->d_inode; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 359 | struct buffer_head *bh; |
| 360 | sector_t block; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 361 | |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 362 | PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_SIZE, |
| 363 | (unsigned long long)index << PAGE_SHIFT); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 364 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 365 | page = alloc_page(GFP_KERNEL); |
| 366 | if (!page) |
| 367 | page = ERR_PTR(-ENOMEM); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 368 | if (IS_ERR(page)) |
| 369 | goto out; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 370 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 371 | bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); |
| 372 | if (!bh) { |
| 373 | put_page(page); |
| 374 | page = ERR_PTR(-ENOMEM); |
| 375 | goto out; |
| 376 | } |
| 377 | attach_page_buffers(page, bh); |
| 378 | block = index << (PAGE_SHIFT - inode->i_blkbits); |
| 379 | while (bh) { |
| 380 | if (count == 0) |
| 381 | bh->b_blocknr = 0; |
| 382 | else { |
| 383 | bh->b_blocknr = bmap(inode, block); |
| 384 | if (bh->b_blocknr == 0) { |
| 385 | /* Cannot use this file! */ |
| 386 | free_buffers(page); |
| 387 | page = ERR_PTR(-EINVAL); |
| 388 | goto out; |
| 389 | } |
| 390 | bh->b_bdev = inode->i_sb->s_bdev; |
| 391 | if (count < (1<<inode->i_blkbits)) |
| 392 | count = 0; |
| 393 | else |
| 394 | count -= (1<<inode->i_blkbits); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 395 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 396 | bh->b_end_io = end_bitmap_write; |
| 397 | bh->b_private = bitmap; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 398 | atomic_inc(&bitmap->pending_writes); |
| 399 | set_buffer_locked(bh); |
| 400 | set_buffer_mapped(bh); |
| 401 | submit_bh(READ, bh); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 402 | } |
| 403 | block++; |
| 404 | bh = bh->b_this_page; |
| 405 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 406 | page->index = index; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 407 | |
| 408 | wait_event(bitmap->write_wait, |
| 409 | atomic_read(&bitmap->pending_writes)==0); |
| 410 | if (bitmap->flags & BITMAP_WRITE_ERROR) { |
| 411 | free_buffers(page); |
| 412 | page = ERR_PTR(-EIO); |
| 413 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 414 | out: |
| 415 | if (IS_ERR(page)) |
| 416 | printk(KERN_ALERT "md: bitmap read error: (%dB @ %Lu): %ld\n", |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 417 | (int)PAGE_SIZE, |
| 418 | (unsigned long long)index << PAGE_SHIFT, |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 419 | PTR_ERR(page)); |
| 420 | return page; |
| 421 | } |
| 422 | |
| 423 | /* |
| 424 | * bitmap file superblock operations |
| 425 | */ |
| 426 | |
| 427 | /* update the event counter and sync the superblock to disk */ |
| 428 | int bitmap_update_sb(struct bitmap *bitmap) |
| 429 | { |
| 430 | bitmap_super_t *sb; |
| 431 | unsigned long flags; |
| 432 | |
| 433 | if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ |
| 434 | return 0; |
| 435 | spin_lock_irqsave(&bitmap->lock, flags); |
| 436 | if (!bitmap->sb_page) { /* no superblock */ |
| 437 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 438 | return 0; |
| 439 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 440 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 441 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 442 | sb->events = cpu_to_le64(bitmap->mddev->events); |
| 443 | if (!bitmap->mddev->degraded) |
| 444 | sb->events_cleared = cpu_to_le64(bitmap->mddev->events); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 445 | kunmap_atomic(sb, KM_USER0); |
NeilBrown | 8a5e9cf | 2005-06-21 17:17:29 -0700 | [diff] [blame] | 446 | return write_page(bitmap, bitmap->sb_page, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 447 | } |
| 448 | |
| 449 | /* print out the bitmap file superblock */ |
| 450 | void bitmap_print_sb(struct bitmap *bitmap) |
| 451 | { |
| 452 | bitmap_super_t *sb; |
| 453 | |
| 454 | if (!bitmap || !bitmap->sb_page) |
| 455 | return; |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 456 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 457 | printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 458 | printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); |
| 459 | printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); |
| 460 | printk(KERN_DEBUG " uuid: %08x.%08x.%08x.%08x\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 461 | *(__u32 *)(sb->uuid+0), |
| 462 | *(__u32 *)(sb->uuid+4), |
| 463 | *(__u32 *)(sb->uuid+8), |
| 464 | *(__u32 *)(sb->uuid+12)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 465 | printk(KERN_DEBUG " events: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 466 | (unsigned long long) le64_to_cpu(sb->events)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 467 | printk(KERN_DEBUG "events cleared: %llu\n", |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 468 | (unsigned long long) le64_to_cpu(sb->events_cleared)); |
NeilBrown | a2cff26 | 2005-06-21 17:17:20 -0700 | [diff] [blame] | 469 | printk(KERN_DEBUG " state: %08x\n", le32_to_cpu(sb->state)); |
| 470 | printk(KERN_DEBUG " chunksize: %d B\n", le32_to_cpu(sb->chunksize)); |
| 471 | printk(KERN_DEBUG " daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); |
| 472 | printk(KERN_DEBUG " sync size: %llu KB\n", |
| 473 | (unsigned long long)le64_to_cpu(sb->sync_size)/2); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 474 | printk(KERN_DEBUG "max write behind: %d\n", le32_to_cpu(sb->write_behind)); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 475 | kunmap_atomic(sb, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | /* read the superblock from the bitmap file and initialize some bitmap fields */ |
| 479 | static int bitmap_read_sb(struct bitmap *bitmap) |
| 480 | { |
| 481 | char *reason = NULL; |
| 482 | bitmap_super_t *sb; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 483 | unsigned long chunksize, daemon_sleep, write_behind; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 484 | unsigned long long events; |
| 485 | int err = -EINVAL; |
| 486 | |
| 487 | /* page 0 is the superblock, read it... */ |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 488 | if (bitmap->file) { |
| 489 | loff_t isize = i_size_read(bitmap->file->f_mapping->host); |
| 490 | int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; |
| 491 | |
| 492 | bitmap->sb_page = read_page(bitmap->file, 0, bitmap, bytes); |
| 493 | } else { |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 494 | bitmap->sb_page = read_sb_page(bitmap->mddev, bitmap->offset, 0); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 495 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 496 | if (IS_ERR(bitmap->sb_page)) { |
| 497 | err = PTR_ERR(bitmap->sb_page); |
| 498 | bitmap->sb_page = NULL; |
| 499 | return err; |
| 500 | } |
| 501 | |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 502 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 503 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 504 | chunksize = le32_to_cpu(sb->chunksize); |
| 505 | daemon_sleep = le32_to_cpu(sb->daemon_sleep); |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 506 | write_behind = le32_to_cpu(sb->write_behind); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 507 | |
| 508 | /* verify that the bitmap-specific fields are valid */ |
| 509 | if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) |
| 510 | reason = "bad magic"; |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 511 | else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || |
| 512 | le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 513 | reason = "unrecognized superblock version"; |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 514 | else if (chunksize < PAGE_SIZE) |
| 515 | reason = "bitmap chunksize too small"; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 516 | else if ((1 << ffz(~chunksize)) != chunksize) |
| 517 | reason = "bitmap chunksize not a power of 2"; |
NeilBrown | 7dd5d34 | 2006-01-06 00:20:39 -0800 | [diff] [blame] | 518 | else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT / HZ) |
| 519 | reason = "daemon sleep period out of range"; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 520 | else if (write_behind > COUNTER_MAX) |
| 521 | reason = "write-behind limit out of range (0 - 16383)"; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 522 | if (reason) { |
| 523 | printk(KERN_INFO "%s: invalid bitmap file superblock: %s\n", |
| 524 | bmname(bitmap), reason); |
| 525 | goto out; |
| 526 | } |
| 527 | |
| 528 | /* keep the array size field of the bitmap superblock up to date */ |
| 529 | sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); |
| 530 | |
| 531 | if (!bitmap->mddev->persistent) |
| 532 | goto success; |
| 533 | |
| 534 | /* |
| 535 | * if we have a persistent array superblock, compare the |
| 536 | * bitmap's UUID and event counter to the mddev's |
| 537 | */ |
| 538 | if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { |
| 539 | printk(KERN_INFO "%s: bitmap superblock UUID mismatch\n", |
| 540 | bmname(bitmap)); |
| 541 | goto out; |
| 542 | } |
| 543 | events = le64_to_cpu(sb->events); |
| 544 | if (events < bitmap->mddev->events) { |
| 545 | printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) " |
| 546 | "-- forcing full recovery\n", bmname(bitmap), events, |
| 547 | (unsigned long long) bitmap->mddev->events); |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 548 | sb->state |= cpu_to_le32(BITMAP_STALE); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 549 | } |
| 550 | success: |
| 551 | /* assign fields using values from superblock */ |
| 552 | bitmap->chunksize = chunksize; |
| 553 | bitmap->daemon_sleep = daemon_sleep; |
NeilBrown | 585f0dd | 2005-09-09 16:23:49 -0700 | [diff] [blame] | 554 | bitmap->daemon_lastrun = jiffies; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 555 | bitmap->max_write_behind = write_behind; |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 556 | bitmap->flags |= le32_to_cpu(sb->state); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 557 | if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) |
| 558 | bitmap->flags |= BITMAP_HOSTENDIAN; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 559 | bitmap->events_cleared = le64_to_cpu(sb->events_cleared); |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 560 | if (sb->state & cpu_to_le32(BITMAP_STALE)) |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 561 | bitmap->events_cleared = bitmap->mddev->events; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 562 | err = 0; |
| 563 | out: |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 564 | kunmap_atomic(sb, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 565 | if (err) |
| 566 | bitmap_print_sb(bitmap); |
| 567 | return err; |
| 568 | } |
| 569 | |
| 570 | enum bitmap_mask_op { |
| 571 | MASK_SET, |
| 572 | MASK_UNSET |
| 573 | }; |
| 574 | |
| 575 | /* record the state of the bitmap in the superblock */ |
| 576 | static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, |
| 577 | enum bitmap_mask_op op) |
| 578 | { |
| 579 | bitmap_super_t *sb; |
| 580 | unsigned long flags; |
| 581 | |
| 582 | spin_lock_irqsave(&bitmap->lock, flags); |
Adrian Bunk | 7e31765 | 2006-03-25 03:07:51 -0800 | [diff] [blame] | 583 | if (!bitmap->sb_page) { /* can't set the state */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 584 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 585 | return; |
| 586 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 587 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 588 | sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 589 | switch (op) { |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 590 | case MASK_SET: sb->state |= cpu_to_le32(bits); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 591 | break; |
NeilBrown | 4f2e639 | 2006-10-21 10:24:09 -0700 | [diff] [blame] | 592 | case MASK_UNSET: sb->state &= cpu_to_le32(~bits); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 593 | break; |
| 594 | default: BUG(); |
| 595 | } |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 596 | kunmap_atomic(sb, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 597 | } |
| 598 | |
| 599 | /* |
| 600 | * general bitmap file operations |
| 601 | */ |
| 602 | |
| 603 | /* calculate the index of the page that contains this bit */ |
| 604 | static inline unsigned long file_page_index(unsigned long chunk) |
| 605 | { |
| 606 | return CHUNK_BIT_OFFSET(chunk) >> PAGE_BIT_SHIFT; |
| 607 | } |
| 608 | |
| 609 | /* calculate the (bit) offset of this bit within a page */ |
| 610 | static inline unsigned long file_page_offset(unsigned long chunk) |
| 611 | { |
| 612 | return CHUNK_BIT_OFFSET(chunk) & (PAGE_BITS - 1); |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * return a pointer to the page in the filemap that contains the given bit |
| 617 | * |
| 618 | * this lookup is complicated by the fact that the bitmap sb might be exactly |
| 619 | * 1 page (e.g., x86) or less than 1 page -- so the bitmap might start on page |
| 620 | * 0 or page 1 |
| 621 | */ |
| 622 | static inline struct page *filemap_get_page(struct bitmap *bitmap, |
| 623 | unsigned long chunk) |
| 624 | { |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 625 | if (file_page_index(chunk) >= bitmap->file_pages) return NULL; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 626 | return bitmap->filemap[file_page_index(chunk) - file_page_index(0)]; |
| 627 | } |
| 628 | |
| 629 | |
| 630 | static void bitmap_file_unmap(struct bitmap *bitmap) |
| 631 | { |
| 632 | struct page **map, *sb_page; |
| 633 | unsigned long *attr; |
| 634 | int pages; |
| 635 | unsigned long flags; |
| 636 | |
| 637 | spin_lock_irqsave(&bitmap->lock, flags); |
| 638 | map = bitmap->filemap; |
| 639 | bitmap->filemap = NULL; |
| 640 | attr = bitmap->filemap_attr; |
| 641 | bitmap->filemap_attr = NULL; |
| 642 | pages = bitmap->file_pages; |
| 643 | bitmap->file_pages = 0; |
| 644 | sb_page = bitmap->sb_page; |
| 645 | bitmap->sb_page = NULL; |
| 646 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 647 | |
| 648 | while (pages--) |
| 649 | if (map[pages]->index != 0) /* 0 is sb_page, release it below */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 650 | free_buffers(map[pages]); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 651 | kfree(map); |
| 652 | kfree(attr); |
| 653 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 654 | if (sb_page) |
| 655 | free_buffers(sb_page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 656 | } |
| 657 | |
| 658 | static void bitmap_file_put(struct bitmap *bitmap) |
| 659 | { |
| 660 | struct file *file; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 661 | unsigned long flags; |
| 662 | |
| 663 | spin_lock_irqsave(&bitmap->lock, flags); |
| 664 | file = bitmap->file; |
| 665 | bitmap->file = NULL; |
| 666 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 667 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 668 | if (file) |
| 669 | wait_event(bitmap->write_wait, |
| 670 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 671 | bitmap_file_unmap(bitmap); |
| 672 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 673 | if (file) { |
Josef Sipek | c649bb9 | 2006-12-08 02:37:19 -0800 | [diff] [blame] | 674 | struct inode *inode = file->f_path.dentry->d_inode; |
Andrew Morton | fc0ecff | 2007-02-10 01:45:39 -0800 | [diff] [blame] | 675 | invalidate_mapping_pages(inode->i_mapping, 0, -1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 676 | fput(file); |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 677 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | |
| 681 | /* |
| 682 | * bitmap_file_kick - if an error occurs while manipulating the bitmap file |
| 683 | * then it is no longer reliable, so we stop using it and we mark the file |
| 684 | * as failed in the superblock |
| 685 | */ |
| 686 | static void bitmap_file_kick(struct bitmap *bitmap) |
| 687 | { |
| 688 | char *path, *ptr = NULL; |
| 689 | |
| 690 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_SET); |
| 691 | bitmap_update_sb(bitmap); |
| 692 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 693 | if (bitmap->file) { |
| 694 | path = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 695 | if (path) |
| 696 | ptr = file_path(bitmap->file, path, PAGE_SIZE); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 697 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 698 | printk(KERN_ALERT "%s: kicking failed bitmap file %s from array!\n", |
| 699 | bmname(bitmap), ptr ? ptr : ""); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 700 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 701 | kfree(path); |
| 702 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 703 | |
| 704 | bitmap_file_put(bitmap); |
| 705 | |
| 706 | return; |
| 707 | } |
| 708 | |
| 709 | enum bitmap_page_attr { |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 710 | BITMAP_PAGE_DIRTY = 0, // there are set bits that need to be synced |
| 711 | BITMAP_PAGE_CLEAN = 1, // there are bits that might need to be cleared |
| 712 | BITMAP_PAGE_NEEDWRITE=2, // there are cleared bits that need to be synced |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 713 | }; |
| 714 | |
| 715 | static inline void set_page_attr(struct bitmap *bitmap, struct page *page, |
| 716 | enum bitmap_page_attr attr) |
| 717 | { |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 718 | __set_bit((page->index<<2) + attr, bitmap->filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 719 | } |
| 720 | |
| 721 | static inline void clear_page_attr(struct bitmap *bitmap, struct page *page, |
| 722 | enum bitmap_page_attr attr) |
| 723 | { |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 724 | __clear_bit((page->index<<2) + attr, bitmap->filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 725 | } |
| 726 | |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 727 | static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page, |
| 728 | enum bitmap_page_attr attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 729 | { |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 730 | return test_bit((page->index<<2) + attr, bitmap->filemap_attr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | /* |
| 734 | * bitmap_file_set_bit -- called before performing a write to the md device |
| 735 | * to set (and eventually sync) a particular bit in the bitmap file |
| 736 | * |
| 737 | * we set the bit immediately, then we record the page number so that |
| 738 | * when an unplug occurs, we can flush the dirty pages out to disk |
| 739 | */ |
| 740 | static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) |
| 741 | { |
| 742 | unsigned long bit; |
| 743 | struct page *page; |
| 744 | void *kaddr; |
| 745 | unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap); |
| 746 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 747 | if (!bitmap->filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 748 | return; |
| 749 | } |
| 750 | |
| 751 | page = filemap_get_page(bitmap, chunk); |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 752 | if (!page) return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 753 | bit = file_page_offset(chunk); |
| 754 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 755 | /* set the bit */ |
| 756 | kaddr = kmap_atomic(page, KM_USER0); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 757 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
| 758 | set_bit(bit, kaddr); |
| 759 | else |
| 760 | ext2_set_bit(bit, kaddr); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 761 | kunmap_atomic(kaddr, KM_USER0); |
| 762 | PRINTK("set file bit %lu page %lu\n", bit, page->index); |
| 763 | |
| 764 | /* record page number so it gets flushed to disk when unplug occurs */ |
| 765 | set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
| 766 | |
| 767 | } |
| 768 | |
| 769 | /* this gets called when the md device is ready to unplug its underlying |
| 770 | * (slave) device queues -- before we let any writes go down, we need to |
| 771 | * sync the dirty pages of the bitmap file to disk */ |
| 772 | int bitmap_unplug(struct bitmap *bitmap) |
| 773 | { |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 774 | unsigned long i, flags; |
| 775 | int dirty, need_write; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 776 | struct page *page; |
| 777 | int wait = 0; |
NeilBrown | 8a5e9cf | 2005-06-21 17:17:29 -0700 | [diff] [blame] | 778 | int err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 779 | |
| 780 | if (!bitmap) |
| 781 | return 0; |
| 782 | |
| 783 | /* look at each page to see if there are any set bits that need to be |
| 784 | * flushed out to disk */ |
| 785 | for (i = 0; i < bitmap->file_pages; i++) { |
| 786 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 787 | if (!bitmap->filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 788 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 789 | return 0; |
| 790 | } |
| 791 | page = bitmap->filemap[i]; |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 792 | dirty = test_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
| 793 | need_write = test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 794 | clear_page_attr(bitmap, page, BITMAP_PAGE_DIRTY); |
| 795 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 796 | if (dirty) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 797 | wait = 1; |
| 798 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 799 | |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 800 | if (dirty | need_write) |
NeilBrown | 8a5e9cf | 2005-06-21 17:17:29 -0700 | [diff] [blame] | 801 | err = write_page(bitmap, page, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 802 | } |
| 803 | if (wait) { /* if any writes were performed, we need to wait on them */ |
NeilBrown | 0b79ccf | 2006-06-26 00:27:44 -0700 | [diff] [blame] | 804 | if (bitmap->file) |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 805 | wait_event(bitmap->write_wait, |
| 806 | atomic_read(&bitmap->pending_writes)==0); |
NeilBrown | 0b79ccf | 2006-06-26 00:27:44 -0700 | [diff] [blame] | 807 | else |
NeilBrown | a9701a3 | 2005-11-08 21:39:34 -0800 | [diff] [blame] | 808 | md_super_wait(bitmap->mddev); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 809 | } |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 810 | if (bitmap->flags & BITMAP_WRITE_ERROR) |
| 811 | bitmap_file_kick(bitmap); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 812 | return 0; |
| 813 | } |
| 814 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 815 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 816 | /* * bitmap_init_from_disk -- called at bitmap_create time to initialize |
| 817 | * the in-memory bitmap from the on-disk bitmap -- also, sets up the |
| 818 | * memory mapping of the bitmap file |
| 819 | * Special cases: |
| 820 | * if there's no bitmap file, or if the bitmap file had been |
| 821 | * previously kicked from the array, we mark all the bits as |
| 822 | * 1's in order to cause a full resync. |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 823 | * |
| 824 | * We ignore all bits for sectors that end earlier than 'start'. |
| 825 | * This is used when reading an out-of-date bitmap... |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 826 | */ |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 827 | static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 828 | { |
| 829 | unsigned long i, chunks, index, oldindex, bit; |
| 830 | struct page *page = NULL, *oldpage = NULL; |
| 831 | unsigned long num_pages, bit_cnt = 0; |
| 832 | struct file *file; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 833 | unsigned long bytes, offset; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 834 | int outofdate; |
| 835 | int ret = -ENOSPC; |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 836 | void *paddr; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 837 | |
| 838 | chunks = bitmap->chunks; |
| 839 | file = bitmap->file; |
| 840 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 841 | BUG_ON(!file && !bitmap->offset); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 842 | |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 843 | #ifdef INJECT_FAULTS_3 |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 844 | outofdate = 1; |
| 845 | #else |
| 846 | outofdate = bitmap->flags & BITMAP_STALE; |
| 847 | #endif |
| 848 | if (outofdate) |
| 849 | printk(KERN_INFO "%s: bitmap file is out of date, doing full " |
| 850 | "recovery\n", bmname(bitmap)); |
| 851 | |
| 852 | bytes = (chunks + 7) / 8; |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 853 | |
NeilBrown | cdbb4cc | 2005-06-21 17:17:18 -0700 | [diff] [blame] | 854 | num_pages = (bytes + sizeof(bitmap_super_t) + PAGE_SIZE - 1) / PAGE_SIZE; |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 855 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 856 | 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] | 857 | printk(KERN_INFO "%s: bitmap file too short %lu < %lu\n", |
| 858 | bmname(bitmap), |
| 859 | (unsigned long) i_size_read(file->f_mapping->host), |
| 860 | bytes + sizeof(bitmap_super_t)); |
| 861 | goto out; |
| 862 | } |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 863 | |
| 864 | ret = -ENOMEM; |
| 865 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 866 | bitmap->filemap = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL); |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 867 | if (!bitmap->filemap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 868 | goto out; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 869 | |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 870 | /* We need 4 bits per page, rounded up to a multiple of sizeof(unsigned long) */ |
| 871 | bitmap->filemap_attr = kzalloc( |
Neil Brown | 505fa2c | 2007-04-11 23:28:44 -0700 | [diff] [blame] | 872 | roundup( DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), |
NeilBrown | e16b68b | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 873 | GFP_KERNEL); |
NeilBrown | bc7f77d | 2005-06-21 17:17:17 -0700 | [diff] [blame] | 874 | if (!bitmap->filemap_attr) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 875 | goto out; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 876 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 877 | oldindex = ~0L; |
| 878 | |
| 879 | for (i = 0; i < chunks; i++) { |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 880 | int b; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 881 | index = file_page_index(i); |
| 882 | bit = file_page_offset(i); |
| 883 | if (index != oldindex) { /* this is a new page, read it in */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 884 | int count; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 885 | /* unmap the old page, we're done with it */ |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 886 | if (index == num_pages-1) |
NeilBrown | f49d5e6 | 2007-01-26 00:57:03 -0800 | [diff] [blame] | 887 | count = bytes + sizeof(bitmap_super_t) |
| 888 | - index * PAGE_SIZE; |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 889 | else |
| 890 | count = PAGE_SIZE; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 891 | if (index == 0) { |
| 892 | /* |
| 893 | * if we're here then the superblock page |
| 894 | * contains some bits (PAGE_SIZE != sizeof sb) |
| 895 | * we've already read it in, so just use it |
| 896 | */ |
| 897 | page = bitmap->sb_page; |
| 898 | offset = sizeof(bitmap_super_t); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 899 | } else if (file) { |
NeilBrown | d785a06 | 2006-06-26 00:27:48 -0700 | [diff] [blame] | 900 | page = read_page(file, index, bitmap, count); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 901 | offset = 0; |
| 902 | } else { |
| 903 | page = read_sb_page(bitmap->mddev, bitmap->offset, index); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 904 | offset = 0; |
| 905 | } |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 906 | if (IS_ERR(page)) { /* read error */ |
| 907 | ret = PTR_ERR(page); |
| 908 | goto out; |
| 909 | } |
| 910 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 911 | oldindex = index; |
| 912 | oldpage = page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 913 | |
| 914 | if (outofdate) { |
| 915 | /* |
| 916 | * if bitmap is out of date, dirty the |
| 917 | * whole page and write it out |
| 918 | */ |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 919 | paddr = kmap_atomic(page, KM_USER0); |
| 920 | memset(paddr + offset, 0xff, |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 921 | PAGE_SIZE - offset); |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 922 | kunmap_atomic(paddr, KM_USER0); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 923 | ret = write_page(bitmap, page, 1); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 924 | if (ret) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 925 | /* release, page not in filemap yet */ |
NeilBrown | 2d1f3b5 | 2006-01-06 00:20:31 -0800 | [diff] [blame] | 926 | put_page(page); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 927 | goto out; |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | bitmap->filemap[bitmap->file_pages++] = page; |
NeilBrown | ab6085c | 2007-05-23 13:58:10 -0700 | [diff] [blame] | 932 | bitmap->last_page_size = count; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 933 | } |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 934 | paddr = kmap_atomic(page, KM_USER0); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 935 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 936 | b = test_bit(bit, paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 937 | else |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 938 | b = ext2_test_bit(bit, paddr); |
| 939 | kunmap_atomic(paddr, KM_USER0); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 940 | if (b) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 941 | /* if the disk bit is set, set the memory bit */ |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 942 | bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap), |
| 943 | ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start) |
| 944 | ); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 945 | bit_cnt++; |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 946 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 947 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | /* everything went OK */ |
| 951 | ret = 0; |
| 952 | bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); |
| 953 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 954 | if (bit_cnt) { /* Kick recovery if any bits were set */ |
| 955 | set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); |
| 956 | md_wakeup_thread(bitmap->mddev->thread); |
| 957 | } |
| 958 | |
| 959 | out: |
| 960 | printk(KERN_INFO "%s: bitmap initialized from disk: " |
| 961 | "read %lu/%lu pages, set %lu bits, status: %d\n", |
| 962 | bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, ret); |
| 963 | |
| 964 | return ret; |
| 965 | } |
| 966 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 967 | void bitmap_write_all(struct bitmap *bitmap) |
| 968 | { |
| 969 | /* We don't actually write all bitmap blocks here, |
| 970 | * just flag them as needing to be written |
| 971 | */ |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 972 | int i; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 973 | |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 974 | for (i=0; i < bitmap->file_pages; i++) |
| 975 | set_page_attr(bitmap, bitmap->filemap[i], |
| 976 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 977 | } |
| 978 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 979 | |
| 980 | static void bitmap_count_page(struct bitmap *bitmap, sector_t offset, int inc) |
| 981 | { |
| 982 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); |
| 983 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 984 | bitmap->bp[page].count += inc; |
| 985 | /* |
| 986 | if (page == 0) printk("count page 0, offset %llu: %d gives %d\n", |
| 987 | (unsigned long long)offset, inc, bitmap->bp[page].count); |
| 988 | */ |
| 989 | bitmap_checkfree(bitmap, page); |
| 990 | } |
| 991 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
| 992 | sector_t offset, int *blocks, |
| 993 | int create); |
| 994 | |
| 995 | /* |
| 996 | * bitmap daemon -- periodically wakes up to clean bits and flush pages |
| 997 | * out to disk |
| 998 | */ |
| 999 | |
| 1000 | int bitmap_daemon_work(struct bitmap *bitmap) |
| 1001 | { |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1002 | unsigned long j; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1003 | unsigned long flags; |
| 1004 | struct page *page = NULL, *lastpage = NULL; |
| 1005 | int err = 0; |
| 1006 | int blocks; |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1007 | void *paddr; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1008 | |
| 1009 | if (bitmap == NULL) |
| 1010 | return 0; |
| 1011 | if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ)) |
| 1012 | return 0; |
| 1013 | bitmap->daemon_lastrun = jiffies; |
| 1014 | |
| 1015 | for (j = 0; j < bitmap->chunks; j++) { |
| 1016 | bitmap_counter_t *bmc; |
| 1017 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1018 | if (!bitmap->filemap) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1019 | /* error or shutdown */ |
| 1020 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1021 | break; |
| 1022 | } |
| 1023 | |
| 1024 | page = filemap_get_page(bitmap, j); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1025 | |
| 1026 | if (page != lastpage) { |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1027 | /* skip this page unless it's marked as needing cleaning */ |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1028 | if (!test_page_attr(bitmap, page, BITMAP_PAGE_CLEAN)) { |
| 1029 | int need_write = test_page_attr(bitmap, page, |
| 1030 | BITMAP_PAGE_NEEDWRITE); |
NeilBrown | a647e4b | 2006-06-26 00:27:46 -0700 | [diff] [blame] | 1031 | if (need_write) |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1032 | clear_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE); |
NeilBrown | a647e4b | 2006-06-26 00:27:46 -0700 | [diff] [blame] | 1033 | |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1034 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1035 | if (need_write) { |
NeilBrown | 8a5e9cf | 2005-06-21 17:17:29 -0700 | [diff] [blame] | 1036 | switch (write_page(bitmap, page, 0)) { |
NeilBrown | 8a5e9cf | 2005-06-21 17:17:29 -0700 | [diff] [blame] | 1037 | case 0: |
| 1038 | break; |
| 1039 | default: |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1040 | bitmap_file_kick(bitmap); |
NeilBrown | 8a5e9cf | 2005-06-21 17:17:29 -0700 | [diff] [blame] | 1041 | } |
NeilBrown | aa3163f | 2005-06-21 17:17:22 -0700 | [diff] [blame] | 1042 | } |
| 1043 | continue; |
| 1044 | } |
| 1045 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1046 | /* grab the new page, sync and release the old */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1047 | if (lastpage != NULL) { |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1048 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1049 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1050 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1051 | err = write_page(bitmap, lastpage, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1052 | } else { |
| 1053 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1054 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1055 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1056 | if (err) |
| 1057 | bitmap_file_kick(bitmap); |
| 1058 | } else |
| 1059 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1060 | lastpage = page; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1061 | /* |
| 1062 | printk("bitmap clean at page %lu\n", j); |
| 1063 | */ |
| 1064 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1065 | clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
| 1066 | } |
| 1067 | bmc = bitmap_get_counter(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), |
| 1068 | &blocks, 0); |
| 1069 | if (bmc) { |
| 1070 | /* |
| 1071 | if (j < 100) printk("bitmap: j=%lu, *bmc = 0x%x\n", j, *bmc); |
| 1072 | */ |
| 1073 | if (*bmc == 2) { |
| 1074 | *bmc=1; /* maybe clear the bit next time */ |
| 1075 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
| 1076 | } else if (*bmc == 1) { |
| 1077 | /* we can clear the bit */ |
| 1078 | *bmc = 0; |
| 1079 | bitmap_count_page(bitmap, j << CHUNK_BLOCK_SHIFT(bitmap), |
| 1080 | -1); |
| 1081 | |
| 1082 | /* clear the bit */ |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1083 | paddr = kmap_atomic(page, KM_USER0); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1084 | if (bitmap->flags & BITMAP_HOSTENDIAN) |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1085 | clear_bit(file_page_offset(j), paddr); |
NeilBrown | bd926c6 | 2005-11-08 21:39:32 -0800 | [diff] [blame] | 1086 | else |
NeilBrown | ea03aff | 2006-01-06 00:20:34 -0800 | [diff] [blame] | 1087 | ext2_clear_bit(file_page_offset(j), paddr); |
| 1088 | kunmap_atomic(paddr, KM_USER0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1089 | } |
| 1090 | } |
| 1091 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1092 | } |
| 1093 | |
| 1094 | /* now sync the final page */ |
| 1095 | if (lastpage != NULL) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1096 | spin_lock_irqsave(&bitmap->lock, flags); |
NeilBrown | ec7a319 | 2006-06-26 00:27:45 -0700 | [diff] [blame] | 1097 | if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1098 | clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1099 | spin_unlock_irqrestore(&bitmap->lock, flags); |
NeilBrown | 77ad4bc | 2005-06-21 17:17:21 -0700 | [diff] [blame] | 1100 | err = write_page(bitmap, lastpage, 0); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1101 | } else { |
| 1102 | set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE); |
| 1103 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1104 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1105 | } |
| 1106 | |
| 1107 | return err; |
| 1108 | } |
| 1109 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1110 | static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap, |
| 1111 | sector_t offset, int *blocks, |
| 1112 | int create) |
| 1113 | { |
| 1114 | /* If 'create', we might release the lock and reclaim it. |
| 1115 | * The lock must have been taken with interrupts enabled. |
| 1116 | * If !create, we don't release the lock. |
| 1117 | */ |
| 1118 | sector_t chunk = offset >> CHUNK_BLOCK_SHIFT(bitmap); |
| 1119 | unsigned long page = chunk >> PAGE_COUNTER_SHIFT; |
| 1120 | unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; |
| 1121 | sector_t csize; |
| 1122 | |
| 1123 | if (bitmap_checkpage(bitmap, page, create) < 0) { |
| 1124 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); |
| 1125 | *blocks = csize - (offset & (csize- 1)); |
| 1126 | return NULL; |
| 1127 | } |
| 1128 | /* now locked ... */ |
| 1129 | |
| 1130 | if (bitmap->bp[page].hijacked) { /* hijacked pointer */ |
| 1131 | /* should we use the first or second counter field |
| 1132 | * of the hijacked pointer? */ |
| 1133 | int hi = (pageoff > PAGE_COUNTER_MASK); |
| 1134 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap) + |
| 1135 | PAGE_COUNTER_SHIFT - 1); |
| 1136 | *blocks = csize - (offset & (csize- 1)); |
| 1137 | return &((bitmap_counter_t *) |
| 1138 | &bitmap->bp[page].map)[hi]; |
| 1139 | } else { /* page is allocated */ |
| 1140 | csize = ((sector_t)1) << (CHUNK_BLOCK_SHIFT(bitmap)); |
| 1141 | *blocks = csize - (offset & (csize- 1)); |
| 1142 | return (bitmap_counter_t *) |
| 1143 | &(bitmap->bp[page].map[pageoff]); |
| 1144 | } |
| 1145 | } |
| 1146 | |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1147 | int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1148 | { |
| 1149 | if (!bitmap) return 0; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1150 | |
| 1151 | if (behind) { |
| 1152 | atomic_inc(&bitmap->behind_writes); |
| 1153 | PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", |
| 1154 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); |
| 1155 | } |
| 1156 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1157 | while (sectors) { |
| 1158 | int blocks; |
| 1159 | bitmap_counter_t *bmc; |
| 1160 | |
| 1161 | spin_lock_irq(&bitmap->lock); |
| 1162 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 1); |
| 1163 | if (!bmc) { |
| 1164 | spin_unlock_irq(&bitmap->lock); |
| 1165 | return 0; |
| 1166 | } |
| 1167 | |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1168 | if (unlikely((*bmc & COUNTER_MAX) == COUNTER_MAX)) { |
| 1169 | DEFINE_WAIT(__wait); |
| 1170 | /* note that it is safe to do the prepare_to_wait |
| 1171 | * after the test as long as we do it before dropping |
| 1172 | * the spinlock. |
| 1173 | */ |
| 1174 | prepare_to_wait(&bitmap->overflow_wait, &__wait, |
| 1175 | TASK_UNINTERRUPTIBLE); |
| 1176 | spin_unlock_irq(&bitmap->lock); |
| 1177 | bitmap->mddev->queue |
| 1178 | ->unplug_fn(bitmap->mddev->queue); |
| 1179 | schedule(); |
| 1180 | finish_wait(&bitmap->overflow_wait, &__wait); |
| 1181 | continue; |
| 1182 | } |
| 1183 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1184 | switch(*bmc) { |
| 1185 | case 0: |
| 1186 | bitmap_file_set_bit(bitmap, offset); |
| 1187 | bitmap_count_page(bitmap,offset, 1); |
| 1188 | blk_plug_device(bitmap->mddev->queue); |
| 1189 | /* fall through */ |
| 1190 | case 1: |
| 1191 | *bmc = 2; |
| 1192 | } |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1193 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1194 | (*bmc)++; |
| 1195 | |
| 1196 | spin_unlock_irq(&bitmap->lock); |
| 1197 | |
| 1198 | offset += blocks; |
| 1199 | if (sectors > blocks) |
| 1200 | sectors -= blocks; |
| 1201 | else sectors = 0; |
| 1202 | } |
| 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1207 | int success, int behind) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1208 | { |
| 1209 | if (!bitmap) return; |
NeilBrown | 4b6d287 | 2005-09-09 16:23:47 -0700 | [diff] [blame] | 1210 | if (behind) { |
| 1211 | atomic_dec(&bitmap->behind_writes); |
| 1212 | PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", |
| 1213 | atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); |
| 1214 | } |
| 1215 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1216 | while (sectors) { |
| 1217 | int blocks; |
| 1218 | unsigned long flags; |
| 1219 | bitmap_counter_t *bmc; |
| 1220 | |
| 1221 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1222 | bmc = bitmap_get_counter(bitmap, offset, &blocks, 0); |
| 1223 | if (!bmc) { |
| 1224 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1225 | return; |
| 1226 | } |
| 1227 | |
| 1228 | if (!success && ! (*bmc & NEEDED_MASK)) |
| 1229 | *bmc |= NEEDED_MASK; |
| 1230 | |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1231 | if ((*bmc & COUNTER_MAX) == COUNTER_MAX) |
| 1232 | wake_up(&bitmap->overflow_wait); |
| 1233 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1234 | (*bmc)--; |
| 1235 | if (*bmc <= 2) { |
| 1236 | set_page_attr(bitmap, |
| 1237 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), |
| 1238 | BITMAP_PAGE_CLEAN); |
| 1239 | } |
| 1240 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1241 | offset += blocks; |
| 1242 | if (sectors > blocks) |
| 1243 | sectors -= blocks; |
| 1244 | else sectors = 0; |
| 1245 | } |
| 1246 | } |
| 1247 | |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1248 | int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, |
| 1249 | int degraded) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1250 | { |
| 1251 | bitmap_counter_t *bmc; |
| 1252 | int rv; |
| 1253 | if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ |
| 1254 | *blocks = 1024; |
| 1255 | return 1; /* always resync if no bitmap */ |
| 1256 | } |
| 1257 | spin_lock_irq(&bitmap->lock); |
| 1258 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1259 | rv = 0; |
| 1260 | if (bmc) { |
| 1261 | /* locked */ |
| 1262 | if (RESYNC(*bmc)) |
| 1263 | rv = 1; |
| 1264 | else if (NEEDED(*bmc)) { |
| 1265 | rv = 1; |
NeilBrown | 6a806c5 | 2005-07-15 03:56:35 -0700 | [diff] [blame] | 1266 | if (!degraded) { /* don't set/clear bits if degraded */ |
| 1267 | *bmc |= RESYNC_MASK; |
| 1268 | *bmc &= ~NEEDED_MASK; |
| 1269 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1270 | } |
| 1271 | } |
| 1272 | spin_unlock_irq(&bitmap->lock); |
| 1273 | return rv; |
| 1274 | } |
| 1275 | |
| 1276 | void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted) |
| 1277 | { |
| 1278 | bitmap_counter_t *bmc; |
| 1279 | unsigned long flags; |
| 1280 | /* |
| 1281 | if (offset == 0) printk("bitmap_end_sync 0 (%d)\n", aborted); |
| 1282 | */ if (bitmap == NULL) { |
| 1283 | *blocks = 1024; |
| 1284 | return; |
| 1285 | } |
| 1286 | spin_lock_irqsave(&bitmap->lock, flags); |
| 1287 | bmc = bitmap_get_counter(bitmap, offset, blocks, 0); |
| 1288 | if (bmc == NULL) |
| 1289 | goto unlock; |
| 1290 | /* locked */ |
| 1291 | /* |
| 1292 | if (offset == 0) printk("bitmap_end sync found 0x%x, blocks %d\n", *bmc, *blocks); |
| 1293 | */ |
| 1294 | if (RESYNC(*bmc)) { |
| 1295 | *bmc &= ~RESYNC_MASK; |
| 1296 | |
| 1297 | if (!NEEDED(*bmc) && aborted) |
| 1298 | *bmc |= NEEDED_MASK; |
| 1299 | else { |
| 1300 | if (*bmc <= 2) { |
| 1301 | set_page_attr(bitmap, |
| 1302 | filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)), |
| 1303 | BITMAP_PAGE_CLEAN); |
| 1304 | } |
| 1305 | } |
| 1306 | } |
| 1307 | unlock: |
| 1308 | spin_unlock_irqrestore(&bitmap->lock, flags); |
| 1309 | } |
| 1310 | |
| 1311 | void bitmap_close_sync(struct bitmap *bitmap) |
| 1312 | { |
| 1313 | /* Sync has finished, and any bitmap chunks that weren't synced |
| 1314 | * properly have been aborted. It remains to us to clear the |
| 1315 | * RESYNC bit wherever it is still on |
| 1316 | */ |
| 1317 | sector_t sector = 0; |
| 1318 | int blocks; |
| 1319 | if (!bitmap) return; |
| 1320 | while (sector < bitmap->mddev->resync_max_sectors) { |
| 1321 | bitmap_end_sync(bitmap, sector, &blocks, 0); |
| 1322 | /* |
| 1323 | if (sector < 500) printk("bitmap_close_sync: sec %llu blks %d\n", |
| 1324 | (unsigned long long)sector, blocks); |
| 1325 | */ sector += blocks; |
| 1326 | } |
| 1327 | } |
| 1328 | |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1329 | static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1330 | { |
| 1331 | /* For each chunk covered by any of these sectors, set the |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1332 | * counter to 1 and set resync_needed. They should all |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1333 | * be 0 at this point |
| 1334 | */ |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1335 | |
| 1336 | int secs; |
| 1337 | bitmap_counter_t *bmc; |
| 1338 | spin_lock_irq(&bitmap->lock); |
| 1339 | bmc = bitmap_get_counter(bitmap, offset, &secs, 1); |
| 1340 | if (!bmc) { |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1341 | spin_unlock_irq(&bitmap->lock); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1342 | return; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1343 | } |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1344 | if (! *bmc) { |
| 1345 | struct page *page; |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1346 | *bmc = 1 | (needed?NEEDED_MASK:0); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1347 | bitmap_count_page(bitmap, offset, 1); |
| 1348 | page = filemap_get_page(bitmap, offset >> CHUNK_BLOCK_SHIFT(bitmap)); |
| 1349 | set_page_attr(bitmap, page, BITMAP_PAGE_CLEAN); |
| 1350 | } |
| 1351 | spin_unlock_irq(&bitmap->lock); |
| 1352 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1353 | } |
| 1354 | |
Paul Clements | 9b1d1da | 2006-10-03 01:15:49 -0700 | [diff] [blame] | 1355 | /* dirty the memory and file bits for bitmap chunks "s" to "e" */ |
| 1356 | void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) |
| 1357 | { |
| 1358 | unsigned long chunk; |
| 1359 | |
| 1360 | for (chunk = s; chunk <= e; chunk++) { |
| 1361 | sector_t sec = chunk << CHUNK_BLOCK_SHIFT(bitmap); |
| 1362 | bitmap_set_memory_bits(bitmap, sec, 1); |
| 1363 | bitmap_file_set_bit(bitmap, sec); |
| 1364 | } |
| 1365 | } |
| 1366 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1367 | /* |
NeilBrown | 6b8b3e8 | 2005-08-04 12:53:35 -0700 | [diff] [blame] | 1368 | * flush out any pending updates |
| 1369 | */ |
| 1370 | void bitmap_flush(mddev_t *mddev) |
| 1371 | { |
| 1372 | struct bitmap *bitmap = mddev->bitmap; |
| 1373 | int sleep; |
| 1374 | |
| 1375 | if (!bitmap) /* there was no bitmap */ |
| 1376 | return; |
| 1377 | |
| 1378 | /* run the daemon_work three time to ensure everything is flushed |
| 1379 | * that can be |
| 1380 | */ |
| 1381 | sleep = bitmap->daemon_sleep; |
| 1382 | bitmap->daemon_sleep = 0; |
| 1383 | bitmap_daemon_work(bitmap); |
| 1384 | bitmap_daemon_work(bitmap); |
| 1385 | bitmap_daemon_work(bitmap); |
| 1386 | bitmap->daemon_sleep = sleep; |
| 1387 | bitmap_update_sb(bitmap); |
| 1388 | } |
| 1389 | |
| 1390 | /* |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1391 | * free memory that was allocated |
| 1392 | */ |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1393 | static void bitmap_free(struct bitmap *bitmap) |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1394 | { |
| 1395 | unsigned long k, pages; |
| 1396 | struct bitmap_page *bp; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1397 | |
| 1398 | if (!bitmap) /* there was no bitmap */ |
| 1399 | return; |
| 1400 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1401 | /* release the bitmap file and kill the daemon */ |
| 1402 | bitmap_file_put(bitmap); |
| 1403 | |
| 1404 | bp = bitmap->bp; |
| 1405 | pages = bitmap->pages; |
| 1406 | |
| 1407 | /* free all allocated memory */ |
| 1408 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1409 | if (bp) /* deallocate the page memory */ |
| 1410 | for (k = 0; k < pages; k++) |
| 1411 | if (bp[k].map && !bp[k].hijacked) |
| 1412 | kfree(bp[k].map); |
| 1413 | kfree(bp); |
| 1414 | kfree(bitmap); |
| 1415 | } |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1416 | void bitmap_destroy(mddev_t *mddev) |
| 1417 | { |
| 1418 | struct bitmap *bitmap = mddev->bitmap; |
| 1419 | |
| 1420 | if (!bitmap) /* there was no bitmap */ |
| 1421 | return; |
| 1422 | |
| 1423 | mddev->bitmap = NULL; /* disconnect from the md device */ |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1424 | if (mddev->thread) |
| 1425 | mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1426 | |
| 1427 | bitmap_free(bitmap); |
| 1428 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1429 | |
| 1430 | /* |
| 1431 | * initialize the bitmap structure |
| 1432 | * if this returns an error, bitmap_destroy must be called to do clean up |
| 1433 | */ |
| 1434 | int bitmap_create(mddev_t *mddev) |
| 1435 | { |
| 1436 | struct bitmap *bitmap; |
| 1437 | unsigned long blocks = mddev->resync_max_sectors; |
| 1438 | unsigned long chunks; |
| 1439 | unsigned long pages; |
| 1440 | struct file *file = mddev->bitmap_file; |
| 1441 | int err; |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1442 | sector_t start; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1443 | |
Alexey Dobriyan | 5f6e3c83 | 2006-10-11 01:22:26 -0700 | [diff] [blame] | 1444 | BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1445 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1446 | if (!file && !mddev->bitmap_offset) /* bitmap disabled, nothing to do */ |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1447 | return 0; |
| 1448 | |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1449 | BUG_ON(file && mddev->bitmap_offset); |
| 1450 | |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1451 | bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1452 | if (!bitmap) |
| 1453 | return -ENOMEM; |
| 1454 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1455 | spin_lock_init(&bitmap->lock); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1456 | atomic_set(&bitmap->pending_writes, 0); |
| 1457 | init_waitqueue_head(&bitmap->write_wait); |
Neil Brown | da6e1a3 | 2007-02-08 14:20:37 -0800 | [diff] [blame] | 1458 | init_waitqueue_head(&bitmap->overflow_wait); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1459 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1460 | bitmap->mddev = mddev; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1461 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1462 | bitmap->file = file; |
NeilBrown | a654b9d8 | 2005-06-21 17:17:27 -0700 | [diff] [blame] | 1463 | bitmap->offset = mddev->bitmap_offset; |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1464 | if (file) { |
| 1465 | get_file(file); |
Mark Fasheh | ef51c97 | 2007-05-08 00:27:10 -0700 | [diff] [blame] | 1466 | do_sync_mapping_range(file->f_mapping, 0, LLONG_MAX, |
| 1467 | SYNC_FILE_RANGE_WAIT_BEFORE | |
| 1468 | SYNC_FILE_RANGE_WRITE | |
| 1469 | SYNC_FILE_RANGE_WAIT_AFTER); |
NeilBrown | ce25c31 | 2006-06-26 00:27:49 -0700 | [diff] [blame] | 1470 | } |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1471 | /* read superblock from bitmap file (this sets bitmap->chunksize) */ |
| 1472 | err = bitmap_read_sb(bitmap); |
| 1473 | if (err) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1474 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1475 | |
Paul Clements | a638b2d | 2006-10-03 01:16:01 -0700 | [diff] [blame] | 1476 | bitmap->chunkshift = ffz(~bitmap->chunksize); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1477 | |
| 1478 | /* now that chunksize and chunkshift are set, we can use these macros */ |
| 1479 | chunks = (blocks + CHUNK_BLOCK_RATIO(bitmap) - 1) / |
| 1480 | CHUNK_BLOCK_RATIO(bitmap); |
| 1481 | pages = (chunks + PAGE_COUNTER_RATIO - 1) / PAGE_COUNTER_RATIO; |
| 1482 | |
| 1483 | BUG_ON(!pages); |
| 1484 | |
| 1485 | bitmap->chunks = chunks; |
| 1486 | bitmap->pages = pages; |
| 1487 | bitmap->missing_pages = pages; |
| 1488 | bitmap->counter_bits = COUNTER_BITS; |
| 1489 | |
| 1490 | bitmap->syncchunk = ~0UL; |
| 1491 | |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 1492 | #ifdef INJECT_FATAL_FAULT_1 |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1493 | bitmap->bp = NULL; |
| 1494 | #else |
NeilBrown | 9ffae0c | 2006-01-06 00:20:32 -0800 | [diff] [blame] | 1495 | bitmap->bp = kzalloc(pages * sizeof(*bitmap->bp), GFP_KERNEL); |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1496 | #endif |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1497 | err = -ENOMEM; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1498 | if (!bitmap->bp) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1499 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1500 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1501 | /* now that we have some pages available, initialize the in-memory |
| 1502 | * bitmap from the on-disk bitmap */ |
NeilBrown | 6a07997 | 2005-09-09 16:23:44 -0700 | [diff] [blame] | 1503 | start = 0; |
| 1504 | if (mddev->degraded == 0 |
| 1505 | || bitmap->events_cleared == mddev->events) |
| 1506 | /* no need to keep dirty bits to optimise a re-add of a missing device */ |
| 1507 | start = mddev->recovery_cp; |
| 1508 | err = bitmap_init_from_disk(bitmap, start); |
NeilBrown | 193f1c9 | 2005-08-04 12:53:33 -0700 | [diff] [blame] | 1509 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1510 | if (err) |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1511 | goto error; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1512 | |
| 1513 | printk(KERN_INFO "created bitmap (%lu pages) for device %s\n", |
| 1514 | pages, bmname(bitmap)); |
| 1515 | |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1516 | mddev->bitmap = bitmap; |
| 1517 | |
NeilBrown | b15c2e5 | 2006-01-06 00:20:16 -0800 | [diff] [blame] | 1518 | mddev->thread->timeout = bitmap->daemon_sleep * HZ; |
| 1519 | |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1520 | return bitmap_update_sb(bitmap); |
NeilBrown | 3178b0d | 2005-09-09 16:23:50 -0700 | [diff] [blame] | 1521 | |
| 1522 | error: |
| 1523 | bitmap_free(bitmap); |
| 1524 | return err; |
NeilBrown | 32a7627 | 2005-06-21 17:17:14 -0700 | [diff] [blame] | 1525 | } |
| 1526 | |
| 1527 | /* the bitmap API -- for raid personalities */ |
| 1528 | EXPORT_SYMBOL(bitmap_startwrite); |
| 1529 | EXPORT_SYMBOL(bitmap_endwrite); |
| 1530 | EXPORT_SYMBOL(bitmap_start_sync); |
| 1531 | EXPORT_SYMBOL(bitmap_end_sync); |
| 1532 | EXPORT_SYMBOL(bitmap_unplug); |
| 1533 | EXPORT_SYMBOL(bitmap_close_sync); |