1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2935fe098SMike Snitzer /* 3935fe098SMike Snitzer * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 4935fe098SMike Snitzer * 5935fe098SMike Snitzer * bitmap_create - sets up the bitmap structure 6935fe098SMike Snitzer * bitmap_destroy - destroys the bitmap structure 7935fe098SMike Snitzer * 8935fe098SMike Snitzer * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: 9935fe098SMike Snitzer * - added disk storage for bitmap 10935fe098SMike Snitzer * - changes to allow various bitmap chunk sizes 11935fe098SMike Snitzer */ 12935fe098SMike Snitzer 13935fe098SMike Snitzer /* 14935fe098SMike Snitzer * Still to do: 15935fe098SMike Snitzer * 16935fe098SMike Snitzer * flush after percent set rather than just time based. (maybe both). 17935fe098SMike Snitzer */ 18935fe098SMike Snitzer 19935fe098SMike Snitzer #include <linux/blkdev.h> 20935fe098SMike Snitzer #include <linux/module.h> 21935fe098SMike Snitzer #include <linux/errno.h> 22935fe098SMike Snitzer #include <linux/slab.h> 23935fe098SMike Snitzer #include <linux/init.h> 24935fe098SMike Snitzer #include <linux/timer.h> 25935fe098SMike Snitzer #include <linux/sched.h> 26935fe098SMike Snitzer #include <linux/list.h> 27935fe098SMike Snitzer #include <linux/file.h> 28935fe098SMike Snitzer #include <linux/mount.h> 29935fe098SMike Snitzer #include <linux/buffer_head.h> 30935fe098SMike Snitzer #include <linux/seq_file.h> 31935fe098SMike Snitzer #include <trace/events/block.h> 32935fe098SMike Snitzer #include "md.h" 33935fe098SMike Snitzer #include "md-bitmap.h" 34935fe098SMike Snitzer 35935fe098SMike Snitzer static inline char *bmname(struct bitmap *bitmap) 36935fe098SMike Snitzer { 37935fe098SMike Snitzer return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; 38935fe098SMike Snitzer } 39935fe098SMike Snitzer 40935fe098SMike Snitzer /* 41935fe098SMike Snitzer * check a page and, if necessary, allocate it (or hijack it if the alloc fails) 42935fe098SMike Snitzer * 43935fe098SMike Snitzer * 1) check to see if this page is allocated, if it's not then try to alloc 44935fe098SMike Snitzer * 2) if the alloc fails, set the page's hijacked flag so we'll use the 45935fe098SMike Snitzer * page pointer directly as a counter 46935fe098SMike Snitzer * 47935fe098SMike Snitzer * if we find our page, we increment the page's refcount so that it stays 48935fe098SMike Snitzer * allocated while we're using it 49935fe098SMike Snitzer */ 50e64e4018SAndy Shevchenko static int md_bitmap_checkpage(struct bitmap_counts *bitmap, 51935fe098SMike Snitzer unsigned long page, int create, int no_hijack) 52935fe098SMike Snitzer __releases(bitmap->lock) 53935fe098SMike Snitzer __acquires(bitmap->lock) 54935fe098SMike Snitzer { 55935fe098SMike Snitzer unsigned char *mappage; 56935fe098SMike Snitzer 57301867b1SLi Nan WARN_ON_ONCE(page >= bitmap->pages); 58935fe098SMike Snitzer if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ 59935fe098SMike Snitzer return 0; 60935fe098SMike Snitzer 61935fe098SMike Snitzer if (bitmap->bp[page].map) /* page is already allocated, just return */ 62935fe098SMike Snitzer return 0; 63935fe098SMike Snitzer 64935fe098SMike Snitzer if (!create) 65935fe098SMike Snitzer return -ENOENT; 66935fe098SMike Snitzer 67935fe098SMike Snitzer /* this page has not been allocated yet */ 68935fe098SMike Snitzer 69935fe098SMike Snitzer spin_unlock_irq(&bitmap->lock); 70935fe098SMike Snitzer /* It is possible that this is being called inside a 71935fe098SMike Snitzer * prepare_to_wait/finish_wait loop from raid5c:make_request(). 72935fe098SMike Snitzer * In general it is not permitted to sleep in that context as it 73935fe098SMike Snitzer * can cause the loop to spin freely. 74935fe098SMike Snitzer * That doesn't apply here as we can only reach this point 75935fe098SMike Snitzer * once with any loop. 76935fe098SMike Snitzer * When this function completes, either bp[page].map or 77935fe098SMike Snitzer * bp[page].hijacked. In either case, this function will 78935fe098SMike Snitzer * abort before getting to this point again. So there is 79935fe098SMike Snitzer * no risk of a free-spin, and so it is safe to assert 80935fe098SMike Snitzer * that sleeping here is allowed. 81935fe098SMike Snitzer */ 82935fe098SMike Snitzer sched_annotate_sleep(); 83935fe098SMike Snitzer mappage = kzalloc(PAGE_SIZE, GFP_NOIO); 84935fe098SMike Snitzer spin_lock_irq(&bitmap->lock); 85935fe098SMike Snitzer 86935fe098SMike Snitzer if (mappage == NULL) { 87935fe098SMike Snitzer pr_debug("md/bitmap: map page allocation failed, hijacking\n"); 88935fe098SMike Snitzer /* We don't support hijack for cluster raid */ 89935fe098SMike Snitzer if (no_hijack) 90935fe098SMike Snitzer return -ENOMEM; 91935fe098SMike Snitzer /* failed - set the hijacked flag so that we can use the 92935fe098SMike Snitzer * pointer as a counter */ 93935fe098SMike Snitzer if (!bitmap->bp[page].map) 94935fe098SMike Snitzer bitmap->bp[page].hijacked = 1; 95935fe098SMike Snitzer } else if (bitmap->bp[page].map || 96935fe098SMike Snitzer bitmap->bp[page].hijacked) { 97935fe098SMike Snitzer /* somebody beat us to getting the page */ 98935fe098SMike Snitzer kfree(mappage); 99935fe098SMike Snitzer } else { 100935fe098SMike Snitzer 101935fe098SMike Snitzer /* no page was in place and we have one, so install it */ 102935fe098SMike Snitzer 103935fe098SMike Snitzer bitmap->bp[page].map = mappage; 104935fe098SMike Snitzer bitmap->missing_pages--; 105935fe098SMike Snitzer } 106935fe098SMike Snitzer return 0; 107935fe098SMike Snitzer } 108935fe098SMike Snitzer 109935fe098SMike Snitzer /* if page is completely empty, put it back on the free list, or dealloc it */ 110935fe098SMike Snitzer /* if page was hijacked, unmark the flag so it might get alloced next time */ 111935fe098SMike Snitzer /* Note: lock should be held when calling this */ 112e64e4018SAndy Shevchenko static void md_bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page) 113935fe098SMike Snitzer { 114935fe098SMike Snitzer char *ptr; 115935fe098SMike Snitzer 116935fe098SMike Snitzer if (bitmap->bp[page].count) /* page is still busy */ 117935fe098SMike Snitzer return; 118935fe098SMike Snitzer 119935fe098SMike Snitzer /* page is no longer in use, it can be released */ 120935fe098SMike Snitzer 121935fe098SMike Snitzer if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ 122935fe098SMike Snitzer bitmap->bp[page].hijacked = 0; 123935fe098SMike Snitzer bitmap->bp[page].map = NULL; 124935fe098SMike Snitzer } else { 125935fe098SMike Snitzer /* normal case, free the page */ 126935fe098SMike Snitzer ptr = bitmap->bp[page].map; 127935fe098SMike Snitzer bitmap->bp[page].map = NULL; 128935fe098SMike Snitzer bitmap->missing_pages++; 129935fe098SMike Snitzer kfree(ptr); 130935fe098SMike Snitzer } 131935fe098SMike Snitzer } 132935fe098SMike Snitzer 133935fe098SMike Snitzer /* 134935fe098SMike Snitzer * bitmap file handling - read and write the bitmap file and its superblock 135935fe098SMike Snitzer */ 136935fe098SMike Snitzer 137935fe098SMike Snitzer /* 138935fe098SMike Snitzer * basic page I/O operations 139935fe098SMike Snitzer */ 140935fe098SMike Snitzer 141935fe098SMike Snitzer /* IO operations when bitmap is stored near all superblocks */ 142935fe098SMike Snitzer 1430c3ea5ccSChristoph Hellwig /* choose a good rdev and read the page from there */ 1440c3ea5ccSChristoph Hellwig static int read_sb_page(struct mddev *mddev, loff_t offset, 1450c3ea5ccSChristoph Hellwig struct page *page, unsigned long index, int size) 1460c3ea5ccSChristoph Hellwig { 1470c3ea5ccSChristoph Hellwig 148f5f2d5acSChristoph Hellwig sector_t sector = mddev->bitmap_info.offset + offset + 149f5f2d5acSChristoph Hellwig index * (PAGE_SIZE / SECTOR_SIZE); 150935fe098SMike Snitzer struct md_rdev *rdev; 151935fe098SMike Snitzer 152935fe098SMike Snitzer rdev_for_each(rdev, mddev) { 1530c3ea5ccSChristoph Hellwig u32 iosize = roundup(size, bdev_logical_block_size(rdev->bdev)); 1540c3ea5ccSChristoph Hellwig 1550c3ea5ccSChristoph Hellwig if (!test_bit(In_sync, &rdev->flags) || 1560c3ea5ccSChristoph Hellwig test_bit(Faulty, &rdev->flags) || 1570c3ea5ccSChristoph Hellwig test_bit(Bitmap_sync, &rdev->flags)) 158935fe098SMike Snitzer continue; 159935fe098SMike Snitzer 160d7038f95SChristoph Hellwig if (sync_page_io(rdev, sector, iosize, page, REQ_OP_READ, true)) 161935fe098SMike Snitzer return 0; 162935fe098SMike Snitzer } 163935fe098SMike Snitzer return -EIO; 164935fe098SMike Snitzer } 165935fe098SMike Snitzer 166935fe098SMike Snitzer static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) 167935fe098SMike Snitzer { 168935fe098SMike Snitzer /* Iterate the disks of an mddev, using rcu to protect access to the 169935fe098SMike Snitzer * linked list, and raising the refcount of devices we return to ensure 170935fe098SMike Snitzer * they don't disappear while in use. 171935fe098SMike Snitzer * As devices are only added or removed when raid_disk is < 0 and 172935fe098SMike Snitzer * nr_pending is 0 and In_sync is clear, the entries we return will 173935fe098SMike Snitzer * still be in the same position on the list when we re-enter 174935fe098SMike Snitzer * list_for_each_entry_continue_rcu. 175935fe098SMike Snitzer * 176935fe098SMike Snitzer * Note that if entered with 'rdev == NULL' to start at the 177935fe098SMike Snitzer * beginning, we temporarily assign 'rdev' to an address which 178935fe098SMike Snitzer * isn't really an rdev, but which can be used by 179935fe098SMike Snitzer * list_for_each_entry_continue_rcu() to find the first entry. 180935fe098SMike Snitzer */ 181935fe098SMike Snitzer rcu_read_lock(); 182935fe098SMike Snitzer if (rdev == NULL) 183935fe098SMike Snitzer /* start at the beginning */ 184935fe098SMike Snitzer rdev = list_entry(&mddev->disks, struct md_rdev, same_set); 185935fe098SMike Snitzer else { 186935fe098SMike Snitzer /* release the previous rdev and start from there. */ 187935fe098SMike Snitzer rdev_dec_pending(rdev, mddev); 188935fe098SMike Snitzer } 189935fe098SMike Snitzer list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) { 190935fe098SMike Snitzer if (rdev->raid_disk >= 0 && 191935fe098SMike Snitzer !test_bit(Faulty, &rdev->flags)) { 192935fe098SMike Snitzer /* this is a usable devices */ 193935fe098SMike Snitzer atomic_inc(&rdev->nr_pending); 194935fe098SMike Snitzer rcu_read_unlock(); 195935fe098SMike Snitzer return rdev; 196935fe098SMike Snitzer } 197935fe098SMike Snitzer } 198935fe098SMike Snitzer rcu_read_unlock(); 199935fe098SMike Snitzer return NULL; 200935fe098SMike Snitzer } 201935fe098SMike Snitzer 2028745faa9SJon Derrick static unsigned int optimal_io_size(struct block_device *bdev, 2038745faa9SJon Derrick unsigned int last_page_size, 2048745faa9SJon Derrick unsigned int io_size) 2058745faa9SJon Derrick { 2068745faa9SJon Derrick if (bdev_io_opt(bdev) > bdev_logical_block_size(bdev)) 2078745faa9SJon Derrick return roundup(last_page_size, bdev_io_opt(bdev)); 2088745faa9SJon Derrick return io_size; 2098745faa9SJon Derrick } 2108745faa9SJon Derrick 2118745faa9SJon Derrick static unsigned int bitmap_io_size(unsigned int io_size, unsigned int opt_size, 212b1211978SJonathan Derrick loff_t start, loff_t boundary) 2138745faa9SJon Derrick { 2148745faa9SJon Derrick if (io_size != opt_size && 2158745faa9SJon Derrick start + opt_size / SECTOR_SIZE <= boundary) 2168745faa9SJon Derrick return opt_size; 2178745faa9SJon Derrick if (start + io_size / SECTOR_SIZE <= boundary) 2188745faa9SJon Derrick return io_size; 2198745faa9SJon Derrick 2208745faa9SJon Derrick /* Overflows boundary */ 2218745faa9SJon Derrick return 0; 2228745faa9SJon Derrick } 2238745faa9SJon Derrick 224328e17d8SJon Derrick static int __write_sb_page(struct md_rdev *rdev, struct bitmap *bitmap, 225d7038f95SChristoph Hellwig unsigned long pg_index, struct page *page) 226935fe098SMike Snitzer { 227935fe098SMike Snitzer struct block_device *bdev; 228935fe098SMike Snitzer struct mddev *mddev = bitmap->mddev; 229935fe098SMike Snitzer struct bitmap_storage *store = &bitmap->storage; 230b1211978SJonathan Derrick loff_t sboff, offset = mddev->bitmap_info.offset; 231d7038f95SChristoph Hellwig sector_t ps = pg_index * PAGE_SIZE / SECTOR_SIZE; 23210172f20SJon Derrick unsigned int size = PAGE_SIZE; 2338745faa9SJon Derrick unsigned int opt_size = PAGE_SIZE; 234d7038f95SChristoph Hellwig sector_t doff; 235935fe098SMike Snitzer 236935fe098SMike Snitzer bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; 237d7038f95SChristoph Hellwig if (pg_index == store->file_pages - 1) { 23810172f20SJon Derrick unsigned int last_page_size = store->bytes & (PAGE_SIZE - 1); 239328e17d8SJon Derrick 240935fe098SMike Snitzer if (last_page_size == 0) 241935fe098SMike Snitzer last_page_size = PAGE_SIZE; 2428745faa9SJon Derrick size = roundup(last_page_size, bdev_logical_block_size(bdev)); 2438745faa9SJon Derrick opt_size = optimal_io_size(bdev, last_page_size, size); 244935fe098SMike Snitzer } 245328e17d8SJon Derrick 24610172f20SJon Derrick sboff = rdev->sb_start + offset; 24710172f20SJon Derrick doff = rdev->data_offset; 24810172f20SJon Derrick 249328e17d8SJon Derrick /* Just make sure we aren't corrupting data or metadata */ 250935fe098SMike Snitzer if (mddev->external) { 251935fe098SMike Snitzer /* Bitmap could be anywhere. */ 25210172f20SJon Derrick if (sboff + ps > doff && 25310172f20SJon Derrick sboff < (doff + mddev->dev_sectors + PAGE_SIZE / SECTOR_SIZE)) 254328e17d8SJon Derrick return -EINVAL; 255935fe098SMike Snitzer } else if (offset < 0) { 256935fe098SMike Snitzer /* DATA BITMAP METADATA */ 2578745faa9SJon Derrick size = bitmap_io_size(size, opt_size, offset + ps, 0); 2588745faa9SJon Derrick if (size == 0) 259935fe098SMike Snitzer /* bitmap runs in to metadata */ 260328e17d8SJon Derrick return -EINVAL; 261328e17d8SJon Derrick 26210172f20SJon Derrick if (doff + mddev->dev_sectors > sboff) 263935fe098SMike Snitzer /* data runs in to bitmap */ 264328e17d8SJon Derrick return -EINVAL; 265935fe098SMike Snitzer } else if (rdev->sb_start < rdev->data_offset) { 266935fe098SMike Snitzer /* METADATA BITMAP DATA */ 2678745faa9SJon Derrick size = bitmap_io_size(size, opt_size, sboff + ps, doff); 2688745faa9SJon Derrick if (size == 0) 269935fe098SMike Snitzer /* bitmap runs in to data */ 270328e17d8SJon Derrick return -EINVAL; 271935fe098SMike Snitzer } else { 272935fe098SMike Snitzer /* DATA METADATA BITMAP - no problems */ 273935fe098SMike Snitzer } 274328e17d8SJon Derrick 27510172f20SJon Derrick md_super_write(mddev, rdev, sboff + ps, (int) size, page); 276328e17d8SJon Derrick return 0; 277935fe098SMike Snitzer } 278935fe098SMike Snitzer 279d7038f95SChristoph Hellwig static void write_sb_page(struct bitmap *bitmap, unsigned long pg_index, 280d7038f95SChristoph Hellwig struct page *page, bool wait) 281328e17d8SJon Derrick { 282328e17d8SJon Derrick struct mddev *mddev = bitmap->mddev; 283935fe098SMike Snitzer 284328e17d8SJon Derrick do { 28559cefee7SChristoph Hellwig struct md_rdev *rdev = NULL; 28659cefee7SChristoph Hellwig 287328e17d8SJon Derrick while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { 288d7038f95SChristoph Hellwig if (__write_sb_page(rdev, bitmap, pg_index, page) < 0) { 28959cefee7SChristoph Hellwig set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); 29059cefee7SChristoph Hellwig return; 29159cefee7SChristoph Hellwig } 292328e17d8SJon Derrick } 293328e17d8SJon Derrick } while (wait && md_super_wait(mddev) < 0); 294935fe098SMike Snitzer } 295935fe098SMike Snitzer 296e64e4018SAndy Shevchenko static void md_bitmap_file_kick(struct bitmap *bitmap); 2975339178eSChristoph Hellwig 298a34d4ef8SChristoph Hellwig #ifdef CONFIG_MD_BITMAP_FILE 2995339178eSChristoph Hellwig static void write_file_page(struct bitmap *bitmap, struct page *page, int wait) 300935fe098SMike Snitzer { 3015339178eSChristoph Hellwig struct buffer_head *bh = page_buffers(page); 302935fe098SMike Snitzer 303935fe098SMike Snitzer while (bh && bh->b_blocknr) { 304935fe098SMike Snitzer atomic_inc(&bitmap->pending_writes); 305935fe098SMike Snitzer set_buffer_locked(bh); 306935fe098SMike Snitzer set_buffer_mapped(bh); 3071420c4a5SBart Van Assche submit_bh(REQ_OP_WRITE | REQ_SYNC, bh); 308935fe098SMike Snitzer bh = bh->b_this_page; 309935fe098SMike Snitzer } 310935fe098SMike Snitzer 311935fe098SMike Snitzer if (wait) 312935fe098SMike Snitzer wait_event(bitmap->write_wait, 313935fe098SMike Snitzer atomic_read(&bitmap->pending_writes) == 0); 314935fe098SMike Snitzer } 315935fe098SMike Snitzer 316935fe098SMike Snitzer static void end_bitmap_write(struct buffer_head *bh, int uptodate) 317935fe098SMike Snitzer { 318935fe098SMike Snitzer struct bitmap *bitmap = bh->b_private; 319935fe098SMike Snitzer 320935fe098SMike Snitzer if (!uptodate) 321935fe098SMike Snitzer set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); 322935fe098SMike Snitzer if (atomic_dec_and_test(&bitmap->pending_writes)) 323935fe098SMike Snitzer wake_up(&bitmap->write_wait); 324935fe098SMike Snitzer } 325935fe098SMike Snitzer 326935fe098SMike Snitzer static void free_buffers(struct page *page) 327935fe098SMike Snitzer { 328935fe098SMike Snitzer struct buffer_head *bh; 329935fe098SMike Snitzer 330935fe098SMike Snitzer if (!PagePrivate(page)) 331935fe098SMike Snitzer return; 332935fe098SMike Snitzer 333935fe098SMike Snitzer bh = page_buffers(page); 334935fe098SMike Snitzer while (bh) { 335935fe098SMike Snitzer struct buffer_head *next = bh->b_this_page; 336935fe098SMike Snitzer free_buffer_head(bh); 337935fe098SMike Snitzer bh = next; 338935fe098SMike Snitzer } 339db2c1d86SGuoqing Jiang detach_page_private(page); 340935fe098SMike Snitzer put_page(page); 341935fe098SMike Snitzer } 342935fe098SMike Snitzer 343935fe098SMike Snitzer /* read a page from a file. 344935fe098SMike Snitzer * We both read the page, and attach buffers to the page to record the 345935fe098SMike Snitzer * address of each block (using bmap). These addresses will be used 346935fe098SMike Snitzer * to write the block later, completely bypassing the filesystem. 347935fe098SMike Snitzer * This usage is similar to how swap files are handled, and allows us 348935fe098SMike Snitzer * to write to a file with no concerns of memory allocation failing. 349935fe098SMike Snitzer */ 350d681054cSChristoph Hellwig static int read_file_page(struct file *file, unsigned long index, 351d681054cSChristoph Hellwig struct bitmap *bitmap, unsigned long count, struct page *page) 352935fe098SMike Snitzer { 353935fe098SMike Snitzer int ret = 0; 354935fe098SMike Snitzer struct inode *inode = file_inode(file); 355935fe098SMike Snitzer struct buffer_head *bh; 35630460e1eSCarlos Maiolino sector_t block, blk_cur; 357313b825fSXianting Tian unsigned long blocksize = i_blocksize(inode); 358935fe098SMike Snitzer 359935fe098SMike Snitzer pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, 360935fe098SMike Snitzer (unsigned long long)index << PAGE_SHIFT); 361935fe098SMike Snitzer 362313b825fSXianting Tian bh = alloc_page_buffers(page, blocksize, false); 363935fe098SMike Snitzer if (!bh) { 364935fe098SMike Snitzer ret = -ENOMEM; 365935fe098SMike Snitzer goto out; 366935fe098SMike Snitzer } 367db2c1d86SGuoqing Jiang attach_page_private(page, bh); 36830460e1eSCarlos Maiolino blk_cur = index << (PAGE_SHIFT - inode->i_blkbits); 369935fe098SMike Snitzer while (bh) { 37030460e1eSCarlos Maiolino block = blk_cur; 37130460e1eSCarlos Maiolino 372935fe098SMike Snitzer if (count == 0) 373935fe098SMike Snitzer bh->b_blocknr = 0; 374935fe098SMike Snitzer else { 37530460e1eSCarlos Maiolino ret = bmap(inode, &block); 37630460e1eSCarlos Maiolino if (ret || !block) { 377935fe098SMike Snitzer ret = -EINVAL; 37830460e1eSCarlos Maiolino bh->b_blocknr = 0; 379935fe098SMike Snitzer goto out; 380935fe098SMike Snitzer } 38130460e1eSCarlos Maiolino 38230460e1eSCarlos Maiolino bh->b_blocknr = block; 383935fe098SMike Snitzer bh->b_bdev = inode->i_sb->s_bdev; 384313b825fSXianting Tian if (count < blocksize) 385935fe098SMike Snitzer count = 0; 386935fe098SMike Snitzer else 387313b825fSXianting Tian count -= blocksize; 388935fe098SMike Snitzer 389935fe098SMike Snitzer bh->b_end_io = end_bitmap_write; 390935fe098SMike Snitzer bh->b_private = bitmap; 391935fe098SMike Snitzer atomic_inc(&bitmap->pending_writes); 392935fe098SMike Snitzer set_buffer_locked(bh); 393935fe098SMike Snitzer set_buffer_mapped(bh); 3941420c4a5SBart Van Assche submit_bh(REQ_OP_READ, bh); 395935fe098SMike Snitzer } 39630460e1eSCarlos Maiolino blk_cur++; 397935fe098SMike Snitzer bh = bh->b_this_page; 398935fe098SMike Snitzer } 399935fe098SMike Snitzer 400935fe098SMike Snitzer wait_event(bitmap->write_wait, 401935fe098SMike Snitzer atomic_read(&bitmap->pending_writes)==0); 402935fe098SMike Snitzer if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) 403935fe098SMike Snitzer ret = -EIO; 404935fe098SMike Snitzer out: 405935fe098SMike Snitzer if (ret) 406935fe098SMike Snitzer pr_err("md: bitmap read error: (%dB @ %llu): %d\n", 407935fe098SMike Snitzer (int)PAGE_SIZE, 408935fe098SMike Snitzer (unsigned long long)index << PAGE_SHIFT, 409935fe098SMike Snitzer ret); 410935fe098SMike Snitzer return ret; 411935fe098SMike Snitzer } 412a34d4ef8SChristoph Hellwig #else /* CONFIG_MD_BITMAP_FILE */ 413a34d4ef8SChristoph Hellwig static void write_file_page(struct bitmap *bitmap, struct page *page, int wait) 414a34d4ef8SChristoph Hellwig { 415a34d4ef8SChristoph Hellwig } 416a34d4ef8SChristoph Hellwig static int read_file_page(struct file *file, unsigned long index, 417a34d4ef8SChristoph Hellwig struct bitmap *bitmap, unsigned long count, struct page *page) 418a34d4ef8SChristoph Hellwig { 419a34d4ef8SChristoph Hellwig return -EIO; 420a34d4ef8SChristoph Hellwig } 421a34d4ef8SChristoph Hellwig static void free_buffers(struct page *page) 422a34d4ef8SChristoph Hellwig { 423a34d4ef8SChristoph Hellwig put_page(page); 424a34d4ef8SChristoph Hellwig } 425a34d4ef8SChristoph Hellwig #endif /* CONFIG_MD_BITMAP_FILE */ 426935fe098SMike Snitzer 427935fe098SMike Snitzer /* 428935fe098SMike Snitzer * bitmap file superblock operations 429935fe098SMike Snitzer */ 430935fe098SMike Snitzer 431935fe098SMike Snitzer /* 4325339178eSChristoph Hellwig * write out a page to a file 4335339178eSChristoph Hellwig */ 434d7038f95SChristoph Hellwig static void filemap_write_page(struct bitmap *bitmap, unsigned long pg_index, 435d7038f95SChristoph Hellwig bool wait) 4365339178eSChristoph Hellwig { 437d7038f95SChristoph Hellwig struct bitmap_storage *store = &bitmap->storage; 438d7038f95SChristoph Hellwig struct page *page = store->filemap[pg_index]; 439d7038f95SChristoph Hellwig 440d7038f95SChristoph Hellwig if (mddev_is_clustered(bitmap->mddev)) { 441d7038f95SChristoph Hellwig pg_index += bitmap->cluster_slot * 442d7038f95SChristoph Hellwig DIV_ROUND_UP(store->bytes, PAGE_SIZE); 443d7038f95SChristoph Hellwig } 444d7038f95SChristoph Hellwig 445d7038f95SChristoph Hellwig if (store->file) 4465339178eSChristoph Hellwig write_file_page(bitmap, page, wait); 4475339178eSChristoph Hellwig else 448d7038f95SChristoph Hellwig write_sb_page(bitmap, pg_index, page, wait); 4495339178eSChristoph Hellwig } 4505339178eSChristoph Hellwig 4515339178eSChristoph Hellwig /* 452e64e4018SAndy Shevchenko * md_bitmap_wait_writes() should be called before writing any bitmap 453935fe098SMike Snitzer * blocks, to ensure previous writes, particularly from 454e64e4018SAndy Shevchenko * md_bitmap_daemon_work(), have completed. 455935fe098SMike Snitzer */ 456e64e4018SAndy Shevchenko static void md_bitmap_wait_writes(struct bitmap *bitmap) 457935fe098SMike Snitzer { 458935fe098SMike Snitzer if (bitmap->storage.file) 459935fe098SMike Snitzer wait_event(bitmap->write_wait, 460935fe098SMike Snitzer atomic_read(&bitmap->pending_writes)==0); 461935fe098SMike Snitzer else 462935fe098SMike Snitzer /* Note that we ignore the return value. The writes 463935fe098SMike Snitzer * might have failed, but that would just mean that 464935fe098SMike Snitzer * some bits which should be cleared haven't been, 465935fe098SMike Snitzer * which is safe. The relevant bitmap blocks will 466935fe098SMike Snitzer * probably get written again, but there is no great 467935fe098SMike Snitzer * loss if they aren't. 468935fe098SMike Snitzer */ 469935fe098SMike Snitzer md_super_wait(bitmap->mddev); 470935fe098SMike Snitzer } 471935fe098SMike Snitzer 472935fe098SMike Snitzer 473935fe098SMike Snitzer /* update the event counter and sync the superblock to disk */ 474e64e4018SAndy Shevchenko void md_bitmap_update_sb(struct bitmap *bitmap) 475935fe098SMike Snitzer { 476935fe098SMike Snitzer bitmap_super_t *sb; 477935fe098SMike Snitzer 478935fe098SMike Snitzer if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ 479935fe098SMike Snitzer return; 480935fe098SMike Snitzer if (bitmap->mddev->bitmap_info.external) 481935fe098SMike Snitzer return; 482935fe098SMike Snitzer if (!bitmap->storage.sb_page) /* no superblock */ 483935fe098SMike Snitzer return; 484935fe098SMike Snitzer sb = kmap_atomic(bitmap->storage.sb_page); 485935fe098SMike Snitzer sb->events = cpu_to_le64(bitmap->mddev->events); 486935fe098SMike Snitzer if (bitmap->mddev->events < bitmap->events_cleared) 487935fe098SMike Snitzer /* rocking back to read-only */ 488935fe098SMike Snitzer bitmap->events_cleared = bitmap->mddev->events; 489935fe098SMike Snitzer sb->events_cleared = cpu_to_le64(bitmap->events_cleared); 49097f0eb9fSHou Tao /* 49197f0eb9fSHou Tao * clear BITMAP_WRITE_ERROR bit to protect against the case that 49297f0eb9fSHou Tao * a bitmap write error occurred but the later writes succeeded. 49397f0eb9fSHou Tao */ 49497f0eb9fSHou Tao sb->state = cpu_to_le32(bitmap->flags & ~BIT(BITMAP_WRITE_ERROR)); 495935fe098SMike Snitzer /* Just in case these have been changed via sysfs: */ 496935fe098SMike Snitzer sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); 497935fe098SMike Snitzer sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); 498935fe098SMike Snitzer /* This might have been changed by a reshape */ 499935fe098SMike Snitzer sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); 500935fe098SMike Snitzer sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize); 501935fe098SMike Snitzer sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes); 502935fe098SMike Snitzer sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> 503935fe098SMike Snitzer bitmap_info.space); 504935fe098SMike Snitzer kunmap_atomic(sb); 505d7038f95SChristoph Hellwig 506d7038f95SChristoph Hellwig if (bitmap->storage.file) 507d7038f95SChristoph Hellwig write_file_page(bitmap, bitmap->storage.sb_page, 1); 508d7038f95SChristoph Hellwig else 509d7038f95SChristoph Hellwig write_sb_page(bitmap, bitmap->storage.sb_index, 510d7038f95SChristoph Hellwig bitmap->storage.sb_page, 1); 511935fe098SMike Snitzer } 512e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_update_sb); 513935fe098SMike Snitzer 514935fe098SMike Snitzer /* print out the bitmap file superblock */ 515e64e4018SAndy Shevchenko void md_bitmap_print_sb(struct bitmap *bitmap) 516935fe098SMike Snitzer { 517935fe098SMike Snitzer bitmap_super_t *sb; 518935fe098SMike Snitzer 519935fe098SMike Snitzer if (!bitmap || !bitmap->storage.sb_page) 520935fe098SMike Snitzer return; 521935fe098SMike Snitzer sb = kmap_atomic(bitmap->storage.sb_page); 522935fe098SMike Snitzer pr_debug("%s: bitmap file superblock:\n", bmname(bitmap)); 523935fe098SMike Snitzer pr_debug(" magic: %08x\n", le32_to_cpu(sb->magic)); 52445552111SFlorian-Ewald Mueller pr_debug(" version: %u\n", le32_to_cpu(sb->version)); 525935fe098SMike Snitzer pr_debug(" uuid: %08x.%08x.%08x.%08x\n", 526c35403f8SChristoph Hellwig le32_to_cpu(*(__le32 *)(sb->uuid+0)), 527c35403f8SChristoph Hellwig le32_to_cpu(*(__le32 *)(sb->uuid+4)), 528c35403f8SChristoph Hellwig le32_to_cpu(*(__le32 *)(sb->uuid+8)), 529c35403f8SChristoph Hellwig le32_to_cpu(*(__le32 *)(sb->uuid+12))); 530935fe098SMike Snitzer pr_debug(" events: %llu\n", 531935fe098SMike Snitzer (unsigned long long) le64_to_cpu(sb->events)); 532935fe098SMike Snitzer pr_debug("events cleared: %llu\n", 533935fe098SMike Snitzer (unsigned long long) le64_to_cpu(sb->events_cleared)); 534935fe098SMike Snitzer pr_debug(" state: %08x\n", le32_to_cpu(sb->state)); 53545552111SFlorian-Ewald Mueller pr_debug(" chunksize: %u B\n", le32_to_cpu(sb->chunksize)); 53645552111SFlorian-Ewald Mueller pr_debug(" daemon sleep: %us\n", le32_to_cpu(sb->daemon_sleep)); 537935fe098SMike Snitzer pr_debug(" sync size: %llu KB\n", 538935fe098SMike Snitzer (unsigned long long)le64_to_cpu(sb->sync_size)/2); 53945552111SFlorian-Ewald Mueller pr_debug("max write behind: %u\n", le32_to_cpu(sb->write_behind)); 540935fe098SMike Snitzer kunmap_atomic(sb); 541935fe098SMike Snitzer } 542935fe098SMike Snitzer 543935fe098SMike Snitzer /* 544935fe098SMike Snitzer * bitmap_new_disk_sb 545935fe098SMike Snitzer * @bitmap 546935fe098SMike Snitzer * 547935fe098SMike Snitzer * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb 548935fe098SMike Snitzer * reads and verifies the on-disk bitmap superblock and populates bitmap_info. 549935fe098SMike Snitzer * This function verifies 'bitmap_info' and populates the on-disk bitmap 550935fe098SMike Snitzer * structure, which is to be written to disk. 551935fe098SMike Snitzer * 552935fe098SMike Snitzer * Returns: 0 on success, -Exxx on error 553935fe098SMike Snitzer */ 554e64e4018SAndy Shevchenko static int md_bitmap_new_disk_sb(struct bitmap *bitmap) 555935fe098SMike Snitzer { 556935fe098SMike Snitzer bitmap_super_t *sb; 557935fe098SMike Snitzer unsigned long chunksize, daemon_sleep, write_behind; 558935fe098SMike Snitzer 559935fe098SMike Snitzer bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO); 560935fe098SMike Snitzer if (bitmap->storage.sb_page == NULL) 561935fe098SMike Snitzer return -ENOMEM; 562d7038f95SChristoph Hellwig bitmap->storage.sb_index = 0; 563935fe098SMike Snitzer 564935fe098SMike Snitzer sb = kmap_atomic(bitmap->storage.sb_page); 565935fe098SMike Snitzer 566935fe098SMike Snitzer sb->magic = cpu_to_le32(BITMAP_MAGIC); 567935fe098SMike Snitzer sb->version = cpu_to_le32(BITMAP_MAJOR_HI); 568935fe098SMike Snitzer 569935fe098SMike Snitzer chunksize = bitmap->mddev->bitmap_info.chunksize; 570935fe098SMike Snitzer BUG_ON(!chunksize); 571935fe098SMike Snitzer if (!is_power_of_2(chunksize)) { 572935fe098SMike Snitzer kunmap_atomic(sb); 573935fe098SMike Snitzer pr_warn("bitmap chunksize not a power of 2\n"); 574935fe098SMike Snitzer return -EINVAL; 575935fe098SMike Snitzer } 576935fe098SMike Snitzer sb->chunksize = cpu_to_le32(chunksize); 577935fe098SMike Snitzer 578935fe098SMike Snitzer daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; 579935fe098SMike Snitzer if (!daemon_sleep || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { 580935fe098SMike Snitzer pr_debug("Choosing daemon_sleep default (5 sec)\n"); 581935fe098SMike Snitzer daemon_sleep = 5 * HZ; 582935fe098SMike Snitzer } 583935fe098SMike Snitzer sb->daemon_sleep = cpu_to_le32(daemon_sleep); 584935fe098SMike Snitzer bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; 585935fe098SMike Snitzer 586935fe098SMike Snitzer /* 587935fe098SMike Snitzer * FIXME: write_behind for RAID1. If not specified, what 588935fe098SMike Snitzer * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. 589935fe098SMike Snitzer */ 590935fe098SMike Snitzer write_behind = bitmap->mddev->bitmap_info.max_write_behind; 591935fe098SMike Snitzer if (write_behind > COUNTER_MAX) 592935fe098SMike Snitzer write_behind = COUNTER_MAX / 2; 593935fe098SMike Snitzer sb->write_behind = cpu_to_le32(write_behind); 594935fe098SMike Snitzer bitmap->mddev->bitmap_info.max_write_behind = write_behind; 595935fe098SMike Snitzer 596935fe098SMike Snitzer /* keep the array size field of the bitmap superblock up to date */ 597935fe098SMike Snitzer sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); 598935fe098SMike Snitzer 599935fe098SMike Snitzer memcpy(sb->uuid, bitmap->mddev->uuid, 16); 600935fe098SMike Snitzer 601935fe098SMike Snitzer set_bit(BITMAP_STALE, &bitmap->flags); 602935fe098SMike Snitzer sb->state = cpu_to_le32(bitmap->flags); 603935fe098SMike Snitzer bitmap->events_cleared = bitmap->mddev->events; 604935fe098SMike Snitzer sb->events_cleared = cpu_to_le64(bitmap->mddev->events); 605935fe098SMike Snitzer bitmap->mddev->bitmap_info.nodes = 0; 606935fe098SMike Snitzer 607935fe098SMike Snitzer kunmap_atomic(sb); 608935fe098SMike Snitzer 609935fe098SMike Snitzer return 0; 610935fe098SMike Snitzer } 611935fe098SMike Snitzer 612935fe098SMike Snitzer /* read the superblock from the bitmap file and initialize some bitmap fields */ 613e64e4018SAndy Shevchenko static int md_bitmap_read_sb(struct bitmap *bitmap) 614935fe098SMike Snitzer { 615935fe098SMike Snitzer char *reason = NULL; 616935fe098SMike Snitzer bitmap_super_t *sb; 617935fe098SMike Snitzer unsigned long chunksize, daemon_sleep, write_behind; 618935fe098SMike Snitzer unsigned long long events; 619935fe098SMike Snitzer int nodes = 0; 620935fe098SMike Snitzer unsigned long sectors_reserved = 0; 621935fe098SMike Snitzer int err = -EINVAL; 622935fe098SMike Snitzer struct page *sb_page; 623f5f2d5acSChristoph Hellwig loff_t offset = 0; 624935fe098SMike Snitzer 625935fe098SMike Snitzer if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { 626935fe098SMike Snitzer chunksize = 128 * 1024 * 1024; 627935fe098SMike Snitzer daemon_sleep = 5 * HZ; 628935fe098SMike Snitzer write_behind = 0; 629935fe098SMike Snitzer set_bit(BITMAP_STALE, &bitmap->flags); 630935fe098SMike Snitzer err = 0; 631935fe098SMike Snitzer goto out_no_sb; 632935fe098SMike Snitzer } 633935fe098SMike Snitzer /* page 0 is the superblock, read it... */ 634935fe098SMike Snitzer sb_page = alloc_page(GFP_KERNEL); 635935fe098SMike Snitzer if (!sb_page) 636935fe098SMike Snitzer return -ENOMEM; 637935fe098SMike Snitzer bitmap->storage.sb_page = sb_page; 638935fe098SMike Snitzer 639935fe098SMike Snitzer re_read: 640935fe098SMike Snitzer /* If cluster_slot is set, the cluster is setup */ 641935fe098SMike Snitzer if (bitmap->cluster_slot >= 0) { 642935fe098SMike Snitzer sector_t bm_blocks = bitmap->mddev->resync_max_sectors; 643935fe098SMike Snitzer 644a913096dSZhao Heming bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 645a913096dSZhao Heming (bitmap->mddev->bitmap_info.chunksize >> 9)); 646935fe098SMike Snitzer /* bits to bytes */ 647935fe098SMike Snitzer bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t); 648935fe098SMike Snitzer /* to 4k blocks */ 649935fe098SMike Snitzer bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096); 650f5f2d5acSChristoph Hellwig offset = bitmap->cluster_slot * (bm_blocks << 3); 651935fe098SMike Snitzer pr_debug("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__, 652935fe098SMike Snitzer bitmap->cluster_slot, offset); 653935fe098SMike Snitzer } 654935fe098SMike Snitzer 655935fe098SMike Snitzer if (bitmap->storage.file) { 656935fe098SMike Snitzer loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); 657935fe098SMike Snitzer int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; 658935fe098SMike Snitzer 659d681054cSChristoph Hellwig err = read_file_page(bitmap->storage.file, 0, 660935fe098SMike Snitzer bitmap, bytes, sb_page); 661935fe098SMike Snitzer } else { 662f5f2d5acSChristoph Hellwig err = read_sb_page(bitmap->mddev, offset, sb_page, 0, 663f5f2d5acSChristoph Hellwig sizeof(bitmap_super_t)); 664935fe098SMike Snitzer } 665935fe098SMike Snitzer if (err) 666935fe098SMike Snitzer return err; 667935fe098SMike Snitzer 668935fe098SMike Snitzer err = -EINVAL; 669935fe098SMike Snitzer sb = kmap_atomic(sb_page); 670935fe098SMike Snitzer 671935fe098SMike Snitzer chunksize = le32_to_cpu(sb->chunksize); 672935fe098SMike Snitzer daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; 673935fe098SMike Snitzer write_behind = le32_to_cpu(sb->write_behind); 674935fe098SMike Snitzer sectors_reserved = le32_to_cpu(sb->sectors_reserved); 675935fe098SMike Snitzer 676935fe098SMike Snitzer /* verify that the bitmap-specific fields are valid */ 677935fe098SMike Snitzer if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) 678935fe098SMike Snitzer reason = "bad magic"; 679935fe098SMike Snitzer else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || 680935fe098SMike Snitzer le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED) 681935fe098SMike Snitzer reason = "unrecognized superblock version"; 682935fe098SMike Snitzer else if (chunksize < 512) 683935fe098SMike Snitzer reason = "bitmap chunksize too small"; 684935fe098SMike Snitzer else if (!is_power_of_2(chunksize)) 685935fe098SMike Snitzer reason = "bitmap chunksize not a power of 2"; 686935fe098SMike Snitzer else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) 687935fe098SMike Snitzer reason = "daemon sleep period out of range"; 688935fe098SMike Snitzer else if (write_behind > COUNTER_MAX) 689935fe098SMike Snitzer reason = "write-behind limit out of range (0 - 16383)"; 690935fe098SMike Snitzer if (reason) { 691935fe098SMike Snitzer pr_warn("%s: invalid bitmap file superblock: %s\n", 692935fe098SMike Snitzer bmname(bitmap), reason); 693935fe098SMike Snitzer goto out; 694935fe098SMike Snitzer } 695935fe098SMike Snitzer 696e68cb83aSHeming Zhao /* 697e68cb83aSHeming Zhao * Setup nodes/clustername only if bitmap version is 698e68cb83aSHeming Zhao * cluster-compatible 699e68cb83aSHeming Zhao */ 700e68cb83aSHeming Zhao if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) { 701e68cb83aSHeming Zhao nodes = le32_to_cpu(sb->nodes); 70292d9aac9SHeming Zhao strscpy(bitmap->mddev->bitmap_info.cluster_name, 703e68cb83aSHeming Zhao sb->cluster_name, 64); 704e68cb83aSHeming Zhao } 705e68cb83aSHeming Zhao 706935fe098SMike Snitzer /* keep the array size field of the bitmap superblock up to date */ 707935fe098SMike Snitzer sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); 708935fe098SMike Snitzer 709935fe098SMike Snitzer if (bitmap->mddev->persistent) { 710935fe098SMike Snitzer /* 711935fe098SMike Snitzer * We have a persistent array superblock, so compare the 712935fe098SMike Snitzer * bitmap's UUID and event counter to the mddev's 713935fe098SMike Snitzer */ 714935fe098SMike Snitzer if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { 715935fe098SMike Snitzer pr_warn("%s: bitmap superblock UUID mismatch\n", 716935fe098SMike Snitzer bmname(bitmap)); 717935fe098SMike Snitzer goto out; 718935fe098SMike Snitzer } 719935fe098SMike Snitzer events = le64_to_cpu(sb->events); 720935fe098SMike Snitzer if (!nodes && (events < bitmap->mddev->events)) { 721935fe098SMike Snitzer pr_warn("%s: bitmap file is out of date (%llu < %llu) -- forcing full recovery\n", 722935fe098SMike Snitzer bmname(bitmap), events, 723935fe098SMike Snitzer (unsigned long long) bitmap->mddev->events); 724935fe098SMike Snitzer set_bit(BITMAP_STALE, &bitmap->flags); 725935fe098SMike Snitzer } 726935fe098SMike Snitzer } 727935fe098SMike Snitzer 728935fe098SMike Snitzer /* assign fields using values from superblock */ 729935fe098SMike Snitzer bitmap->flags |= le32_to_cpu(sb->state); 730935fe098SMike Snitzer if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) 731935fe098SMike Snitzer set_bit(BITMAP_HOSTENDIAN, &bitmap->flags); 732935fe098SMike Snitzer bitmap->events_cleared = le64_to_cpu(sb->events_cleared); 733935fe098SMike Snitzer err = 0; 734935fe098SMike Snitzer 735935fe098SMike Snitzer out: 736935fe098SMike Snitzer kunmap_atomic(sb); 737e68cb83aSHeming Zhao if (err == 0 && nodes && (bitmap->cluster_slot < 0)) { 738935fe098SMike Snitzer /* Assigning chunksize is required for "re_read" */ 739935fe098SMike Snitzer bitmap->mddev->bitmap_info.chunksize = chunksize; 740935fe098SMike Snitzer err = md_setup_cluster(bitmap->mddev, nodes); 741935fe098SMike Snitzer if (err) { 742935fe098SMike Snitzer pr_warn("%s: Could not setup cluster service (%d)\n", 743935fe098SMike Snitzer bmname(bitmap), err); 744935fe098SMike Snitzer goto out_no_sb; 745935fe098SMike Snitzer } 746935fe098SMike Snitzer bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev); 747935fe098SMike Snitzer goto re_read; 748935fe098SMike Snitzer } 749935fe098SMike Snitzer 750935fe098SMike Snitzer out_no_sb: 751e68cb83aSHeming Zhao if (err == 0) { 752935fe098SMike Snitzer if (test_bit(BITMAP_STALE, &bitmap->flags)) 753935fe098SMike Snitzer bitmap->events_cleared = bitmap->mddev->events; 754935fe098SMike Snitzer bitmap->mddev->bitmap_info.chunksize = chunksize; 755935fe098SMike Snitzer bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; 756935fe098SMike Snitzer bitmap->mddev->bitmap_info.max_write_behind = write_behind; 757935fe098SMike Snitzer bitmap->mddev->bitmap_info.nodes = nodes; 758935fe098SMike Snitzer if (bitmap->mddev->bitmap_info.space == 0 || 759935fe098SMike Snitzer bitmap->mddev->bitmap_info.space > sectors_reserved) 760935fe098SMike Snitzer bitmap->mddev->bitmap_info.space = sectors_reserved; 761e68cb83aSHeming Zhao } else { 762e64e4018SAndy Shevchenko md_bitmap_print_sb(bitmap); 763935fe098SMike Snitzer if (bitmap->cluster_slot < 0) 764935fe098SMike Snitzer md_cluster_stop(bitmap->mddev); 765935fe098SMike Snitzer } 766935fe098SMike Snitzer return err; 767935fe098SMike Snitzer } 768935fe098SMike Snitzer 769935fe098SMike Snitzer /* 770935fe098SMike Snitzer * general bitmap file operations 771935fe098SMike Snitzer */ 772935fe098SMike Snitzer 773935fe098SMike Snitzer /* 774935fe098SMike Snitzer * on-disk bitmap: 775935fe098SMike Snitzer * 776935fe098SMike Snitzer * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap 777935fe098SMike Snitzer * file a page at a time. There's a superblock at the start of the file. 778935fe098SMike Snitzer */ 779935fe098SMike Snitzer /* calculate the index of the page that contains this bit */ 780935fe098SMike Snitzer static inline unsigned long file_page_index(struct bitmap_storage *store, 781935fe098SMike Snitzer unsigned long chunk) 782935fe098SMike Snitzer { 783935fe098SMike Snitzer if (store->sb_page) 784935fe098SMike Snitzer chunk += sizeof(bitmap_super_t) << 3; 785935fe098SMike Snitzer return chunk >> PAGE_BIT_SHIFT; 786935fe098SMike Snitzer } 787935fe098SMike Snitzer 788935fe098SMike Snitzer /* calculate the (bit) offset of this bit within a page */ 789935fe098SMike Snitzer static inline unsigned long file_page_offset(struct bitmap_storage *store, 790935fe098SMike Snitzer unsigned long chunk) 791935fe098SMike Snitzer { 792935fe098SMike Snitzer if (store->sb_page) 793935fe098SMike Snitzer chunk += sizeof(bitmap_super_t) << 3; 794935fe098SMike Snitzer return chunk & (PAGE_BITS - 1); 795935fe098SMike Snitzer } 796935fe098SMike Snitzer 797935fe098SMike Snitzer /* 798935fe098SMike Snitzer * return a pointer to the page in the filemap that contains the given bit 799935fe098SMike Snitzer * 800935fe098SMike Snitzer */ 801935fe098SMike Snitzer static inline struct page *filemap_get_page(struct bitmap_storage *store, 802935fe098SMike Snitzer unsigned long chunk) 803935fe098SMike Snitzer { 804935fe098SMike Snitzer if (file_page_index(store, chunk) >= store->file_pages) 805935fe098SMike Snitzer return NULL; 806935fe098SMike Snitzer return store->filemap[file_page_index(store, chunk)]; 807935fe098SMike Snitzer } 808935fe098SMike Snitzer 809e64e4018SAndy Shevchenko static int md_bitmap_storage_alloc(struct bitmap_storage *store, 810935fe098SMike Snitzer unsigned long chunks, int with_super, 811935fe098SMike Snitzer int slot_number) 812935fe098SMike Snitzer { 813935fe098SMike Snitzer int pnum, offset = 0; 814935fe098SMike Snitzer unsigned long num_pages; 815935fe098SMike Snitzer unsigned long bytes; 816935fe098SMike Snitzer 817935fe098SMike Snitzer bytes = DIV_ROUND_UP(chunks, 8); 818935fe098SMike Snitzer if (with_super) 819935fe098SMike Snitzer bytes += sizeof(bitmap_super_t); 820935fe098SMike Snitzer 821935fe098SMike Snitzer num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); 822935fe098SMike Snitzer offset = slot_number * num_pages; 823935fe098SMike Snitzer 8246da2ec56SKees Cook store->filemap = kmalloc_array(num_pages, sizeof(struct page *), 8256da2ec56SKees Cook GFP_KERNEL); 826935fe098SMike Snitzer if (!store->filemap) 827935fe098SMike Snitzer return -ENOMEM; 828935fe098SMike Snitzer 829935fe098SMike Snitzer if (with_super && !store->sb_page) { 830935fe098SMike Snitzer store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO); 831935fe098SMike Snitzer if (store->sb_page == NULL) 832935fe098SMike Snitzer return -ENOMEM; 833935fe098SMike Snitzer } 834935fe098SMike Snitzer 835935fe098SMike Snitzer pnum = 0; 836935fe098SMike Snitzer if (store->sb_page) { 837935fe098SMike Snitzer store->filemap[0] = store->sb_page; 838935fe098SMike Snitzer pnum = 1; 839d7038f95SChristoph Hellwig store->sb_index = offset; 840935fe098SMike Snitzer } 841935fe098SMike Snitzer 842935fe098SMike Snitzer for ( ; pnum < num_pages; pnum++) { 843935fe098SMike Snitzer store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO); 844935fe098SMike Snitzer if (!store->filemap[pnum]) { 845935fe098SMike Snitzer store->file_pages = pnum; 846935fe098SMike Snitzer return -ENOMEM; 847935fe098SMike Snitzer } 848935fe098SMike Snitzer } 849935fe098SMike Snitzer store->file_pages = pnum; 850935fe098SMike Snitzer 851935fe098SMike Snitzer /* We need 4 bits per page, rounded up to a multiple 852935fe098SMike Snitzer * of sizeof(unsigned long) */ 853935fe098SMike Snitzer store->filemap_attr = kzalloc( 854935fe098SMike Snitzer roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), 855935fe098SMike Snitzer GFP_KERNEL); 856935fe098SMike Snitzer if (!store->filemap_attr) 857935fe098SMike Snitzer return -ENOMEM; 858935fe098SMike Snitzer 859935fe098SMike Snitzer store->bytes = bytes; 860935fe098SMike Snitzer 861935fe098SMike Snitzer return 0; 862935fe098SMike Snitzer } 863935fe098SMike Snitzer 864e64e4018SAndy Shevchenko static void md_bitmap_file_unmap(struct bitmap_storage *store) 865935fe098SMike Snitzer { 866546ac0b2SChristoph Hellwig struct file *file = store->file; 867546ac0b2SChristoph Hellwig struct page *sb_page = store->sb_page; 868546ac0b2SChristoph Hellwig struct page **map = store->filemap; 869546ac0b2SChristoph Hellwig int pages = store->file_pages; 870935fe098SMike Snitzer 871935fe098SMike Snitzer while (pages--) 872935fe098SMike Snitzer if (map[pages] != sb_page) /* 0 is sb_page, release it below */ 873935fe098SMike Snitzer free_buffers(map[pages]); 874935fe098SMike Snitzer kfree(map); 875935fe098SMike Snitzer kfree(store->filemap_attr); 876935fe098SMike Snitzer 877935fe098SMike Snitzer if (sb_page) 878935fe098SMike Snitzer free_buffers(sb_page); 879935fe098SMike Snitzer 880935fe098SMike Snitzer if (file) { 881935fe098SMike Snitzer struct inode *inode = file_inode(file); 882935fe098SMike Snitzer invalidate_mapping_pages(inode->i_mapping, 0, -1); 883935fe098SMike Snitzer fput(file); 884935fe098SMike Snitzer } 885935fe098SMike Snitzer } 886935fe098SMike Snitzer 887935fe098SMike Snitzer /* 888935fe098SMike Snitzer * bitmap_file_kick - if an error occurs while manipulating the bitmap file 889935fe098SMike Snitzer * then it is no longer reliable, so we stop using it and we mark the file 890935fe098SMike Snitzer * as failed in the superblock 891935fe098SMike Snitzer */ 892e64e4018SAndy Shevchenko static void md_bitmap_file_kick(struct bitmap *bitmap) 893935fe098SMike Snitzer { 894935fe098SMike Snitzer if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) { 895e64e4018SAndy Shevchenko md_bitmap_update_sb(bitmap); 896935fe098SMike Snitzer 897935fe098SMike Snitzer if (bitmap->storage.file) { 89892348518SChristoph Hellwig pr_warn("%s: kicking failed bitmap file %pD4 from array!\n", 89992348518SChristoph Hellwig bmname(bitmap), bitmap->storage.file); 900935fe098SMike Snitzer 901935fe098SMike Snitzer } else 902935fe098SMike Snitzer pr_warn("%s: disabling internal bitmap due to errors\n", 903935fe098SMike Snitzer bmname(bitmap)); 904935fe098SMike Snitzer } 905935fe098SMike Snitzer } 906935fe098SMike Snitzer 907935fe098SMike Snitzer enum bitmap_page_attr { 908935fe098SMike Snitzer BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ 909935fe098SMike Snitzer BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. 910935fe098SMike Snitzer * i.e. counter is 1 or 2. */ 911935fe098SMike Snitzer BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ 912935fe098SMike Snitzer }; 913935fe098SMike Snitzer 914935fe098SMike Snitzer static inline void set_page_attr(struct bitmap *bitmap, int pnum, 915935fe098SMike Snitzer enum bitmap_page_attr attr) 916935fe098SMike Snitzer { 917935fe098SMike Snitzer set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); 918935fe098SMike Snitzer } 919935fe098SMike Snitzer 920935fe098SMike Snitzer static inline void clear_page_attr(struct bitmap *bitmap, int pnum, 921935fe098SMike Snitzer enum bitmap_page_attr attr) 922935fe098SMike Snitzer { 923935fe098SMike Snitzer clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); 924935fe098SMike Snitzer } 925935fe098SMike Snitzer 926935fe098SMike Snitzer static inline int test_page_attr(struct bitmap *bitmap, int pnum, 927935fe098SMike Snitzer enum bitmap_page_attr attr) 928935fe098SMike Snitzer { 929935fe098SMike Snitzer return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); 930935fe098SMike Snitzer } 931935fe098SMike Snitzer 932935fe098SMike Snitzer static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum, 933935fe098SMike Snitzer enum bitmap_page_attr attr) 934935fe098SMike Snitzer { 935935fe098SMike Snitzer return test_and_clear_bit((pnum<<2) + attr, 936935fe098SMike Snitzer bitmap->storage.filemap_attr); 937935fe098SMike Snitzer } 938935fe098SMike Snitzer /* 939935fe098SMike Snitzer * bitmap_file_set_bit -- called before performing a write to the md device 940935fe098SMike Snitzer * to set (and eventually sync) a particular bit in the bitmap file 941935fe098SMike Snitzer * 942935fe098SMike Snitzer * we set the bit immediately, then we record the page number so that 943935fe098SMike Snitzer * when an unplug occurs, we can flush the dirty pages out to disk 944935fe098SMike Snitzer */ 945e64e4018SAndy Shevchenko static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) 946935fe098SMike Snitzer { 947935fe098SMike Snitzer unsigned long bit; 948935fe098SMike Snitzer struct page *page; 949935fe098SMike Snitzer void *kaddr; 950935fe098SMike Snitzer unsigned long chunk = block >> bitmap->counts.chunkshift; 951935fe098SMike Snitzer struct bitmap_storage *store = &bitmap->storage; 952d7038f95SChristoph Hellwig unsigned long index = file_page_index(store, chunk); 953935fe098SMike Snitzer unsigned long node_offset = 0; 954935fe098SMike Snitzer 955935fe098SMike Snitzer if (mddev_is_clustered(bitmap->mddev)) 956935fe098SMike Snitzer node_offset = bitmap->cluster_slot * store->file_pages; 957935fe098SMike Snitzer 958935fe098SMike Snitzer page = filemap_get_page(&bitmap->storage, chunk); 959935fe098SMike Snitzer if (!page) 960935fe098SMike Snitzer return; 961935fe098SMike Snitzer bit = file_page_offset(&bitmap->storage, chunk); 962935fe098SMike Snitzer 963935fe098SMike Snitzer /* set the bit */ 964935fe098SMike Snitzer kaddr = kmap_atomic(page); 965935fe098SMike Snitzer if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) 966935fe098SMike Snitzer set_bit(bit, kaddr); 967935fe098SMike Snitzer else 968935fe098SMike Snitzer set_bit_le(bit, kaddr); 969935fe098SMike Snitzer kunmap_atomic(kaddr); 970d7038f95SChristoph Hellwig pr_debug("set file bit %lu page %lu\n", bit, index); 971935fe098SMike Snitzer /* record page number so it gets flushed to disk when unplug occurs */ 972d7038f95SChristoph Hellwig set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_DIRTY); 973935fe098SMike Snitzer } 974935fe098SMike Snitzer 975e64e4018SAndy Shevchenko static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) 976935fe098SMike Snitzer { 977935fe098SMike Snitzer unsigned long bit; 978935fe098SMike Snitzer struct page *page; 979935fe098SMike Snitzer void *paddr; 980935fe098SMike Snitzer unsigned long chunk = block >> bitmap->counts.chunkshift; 981935fe098SMike Snitzer struct bitmap_storage *store = &bitmap->storage; 982d7038f95SChristoph Hellwig unsigned long index = file_page_index(store, chunk); 983935fe098SMike Snitzer unsigned long node_offset = 0; 984935fe098SMike Snitzer 985935fe098SMike Snitzer if (mddev_is_clustered(bitmap->mddev)) 986935fe098SMike Snitzer node_offset = bitmap->cluster_slot * store->file_pages; 987935fe098SMike Snitzer 988935fe098SMike Snitzer page = filemap_get_page(&bitmap->storage, chunk); 989935fe098SMike Snitzer if (!page) 990935fe098SMike Snitzer return; 991935fe098SMike Snitzer bit = file_page_offset(&bitmap->storage, chunk); 992935fe098SMike Snitzer paddr = kmap_atomic(page); 993935fe098SMike Snitzer if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) 994935fe098SMike Snitzer clear_bit(bit, paddr); 995935fe098SMike Snitzer else 996935fe098SMike Snitzer clear_bit_le(bit, paddr); 997935fe098SMike Snitzer kunmap_atomic(paddr); 998d7038f95SChristoph Hellwig if (!test_page_attr(bitmap, index - node_offset, BITMAP_PAGE_NEEDWRITE)) { 999d7038f95SChristoph Hellwig set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_PENDING); 1000935fe098SMike Snitzer bitmap->allclean = 0; 1001935fe098SMike Snitzer } 1002935fe098SMike Snitzer } 1003935fe098SMike Snitzer 1004e64e4018SAndy Shevchenko static int md_bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) 1005935fe098SMike Snitzer { 1006935fe098SMike Snitzer unsigned long bit; 1007935fe098SMike Snitzer struct page *page; 1008935fe098SMike Snitzer void *paddr; 1009935fe098SMike Snitzer unsigned long chunk = block >> bitmap->counts.chunkshift; 1010935fe098SMike Snitzer int set = 0; 1011935fe098SMike Snitzer 1012935fe098SMike Snitzer page = filemap_get_page(&bitmap->storage, chunk); 1013935fe098SMike Snitzer if (!page) 1014935fe098SMike Snitzer return -EINVAL; 1015935fe098SMike Snitzer bit = file_page_offset(&bitmap->storage, chunk); 1016935fe098SMike Snitzer paddr = kmap_atomic(page); 1017935fe098SMike Snitzer if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) 1018935fe098SMike Snitzer set = test_bit(bit, paddr); 1019935fe098SMike Snitzer else 1020935fe098SMike Snitzer set = test_bit_le(bit, paddr); 1021935fe098SMike Snitzer kunmap_atomic(paddr); 1022935fe098SMike Snitzer return set; 1023935fe098SMike Snitzer } 1024935fe098SMike Snitzer 1025935fe098SMike Snitzer /* this gets called when the md device is ready to unplug its underlying 1026935fe098SMike Snitzer * (slave) device queues -- before we let any writes go down, we need to 1027935fe098SMike Snitzer * sync the dirty pages of the bitmap file to disk */ 1028e64e4018SAndy Shevchenko void md_bitmap_unplug(struct bitmap *bitmap) 1029935fe098SMike Snitzer { 1030935fe098SMike Snitzer unsigned long i; 1031935fe098SMike Snitzer int dirty, need_write; 1032935fe098SMike Snitzer int writing = 0; 1033935fe098SMike Snitzer 10347db922baSYu Kuai if (!md_bitmap_enabled(bitmap)) 1035935fe098SMike Snitzer return; 1036935fe098SMike Snitzer 1037935fe098SMike Snitzer /* look at each page to see if there are any set bits that need to be 1038935fe098SMike Snitzer * flushed out to disk */ 1039935fe098SMike Snitzer for (i = 0; i < bitmap->storage.file_pages; i++) { 1040935fe098SMike Snitzer dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); 1041935fe098SMike Snitzer need_write = test_and_clear_page_attr(bitmap, i, 1042935fe098SMike Snitzer BITMAP_PAGE_NEEDWRITE); 1043935fe098SMike Snitzer if (dirty || need_write) { 1044935fe098SMike Snitzer if (!writing) { 1045e64e4018SAndy Shevchenko md_bitmap_wait_writes(bitmap); 1046935fe098SMike Snitzer if (bitmap->mddev->queue) 1047935fe098SMike Snitzer blk_add_trace_msg(bitmap->mddev->queue, 1048935fe098SMike Snitzer "md bitmap_unplug"); 1049935fe098SMike Snitzer } 1050935fe098SMike Snitzer clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); 1051d7038f95SChristoph Hellwig filemap_write_page(bitmap, i, false); 1052935fe098SMike Snitzer writing = 1; 1053935fe098SMike Snitzer } 1054935fe098SMike Snitzer } 1055935fe098SMike Snitzer if (writing) 1056e64e4018SAndy Shevchenko md_bitmap_wait_writes(bitmap); 1057935fe098SMike Snitzer 1058935fe098SMike Snitzer if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) 1059e64e4018SAndy Shevchenko md_bitmap_file_kick(bitmap); 1060935fe098SMike Snitzer } 1061e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_unplug); 1062935fe098SMike Snitzer 1063a022325aSYu Kuai struct bitmap_unplug_work { 1064a022325aSYu Kuai struct work_struct work; 1065a022325aSYu Kuai struct bitmap *bitmap; 1066a022325aSYu Kuai struct completion *done; 1067a022325aSYu Kuai }; 1068a022325aSYu Kuai 1069a022325aSYu Kuai static void md_bitmap_unplug_fn(struct work_struct *work) 1070a022325aSYu Kuai { 1071a022325aSYu Kuai struct bitmap_unplug_work *unplug_work = 1072a022325aSYu Kuai container_of(work, struct bitmap_unplug_work, work); 1073a022325aSYu Kuai 1074a022325aSYu Kuai md_bitmap_unplug(unplug_work->bitmap); 1075a022325aSYu Kuai complete(unplug_work->done); 1076a022325aSYu Kuai } 1077a022325aSYu Kuai 1078a022325aSYu Kuai void md_bitmap_unplug_async(struct bitmap *bitmap) 1079a022325aSYu Kuai { 1080a022325aSYu Kuai DECLARE_COMPLETION_ONSTACK(done); 1081a022325aSYu Kuai struct bitmap_unplug_work unplug_work; 1082a022325aSYu Kuai 1083a022325aSYu Kuai INIT_WORK_ONSTACK(&unplug_work.work, md_bitmap_unplug_fn); 1084a022325aSYu Kuai unplug_work.bitmap = bitmap; 1085a022325aSYu Kuai unplug_work.done = &done; 1086a022325aSYu Kuai 1087a022325aSYu Kuai queue_work(md_bitmap_wq, &unplug_work.work); 1088a022325aSYu Kuai wait_for_completion(&done); 1089a022325aSYu Kuai } 1090a022325aSYu Kuai EXPORT_SYMBOL(md_bitmap_unplug_async); 1091a022325aSYu Kuai 1092e64e4018SAndy Shevchenko static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); 1093844dc669SChristoph Hellwig 1094844dc669SChristoph Hellwig /* 1095844dc669SChristoph Hellwig * Initialize the in-memory bitmap from the on-disk bitmap and set up the memory 1096844dc669SChristoph Hellwig * mapping of the bitmap file. 1097844dc669SChristoph Hellwig * 1098844dc669SChristoph Hellwig * Special case: If there's no bitmap file, or if the bitmap file had been 1099844dc669SChristoph Hellwig * previously kicked from the array, we mark all the bits as 1's in order to 1100844dc669SChristoph Hellwig * cause a full resync. 1101935fe098SMike Snitzer * 1102935fe098SMike Snitzer * We ignore all bits for sectors that end earlier than 'start'. 1103844dc669SChristoph Hellwig * This is used when reading an out-of-date bitmap. 1104935fe098SMike Snitzer */ 1105e64e4018SAndy Shevchenko static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) 1106935fe098SMike Snitzer { 1107844dc669SChristoph Hellwig bool outofdate = test_bit(BITMAP_STALE, &bitmap->flags); 1108844dc669SChristoph Hellwig struct mddev *mddev = bitmap->mddev; 1109844dc669SChristoph Hellwig unsigned long chunks = bitmap->counts.chunks; 1110935fe098SMike Snitzer struct bitmap_storage *store = &bitmap->storage; 1111844dc669SChristoph Hellwig struct file *file = store->file; 1112844dc669SChristoph Hellwig unsigned long node_offset = 0; 1113844dc669SChristoph Hellwig unsigned long bit_cnt = 0; 1114844dc669SChristoph Hellwig unsigned long i; 1115844dc669SChristoph Hellwig int ret; 1116935fe098SMike Snitzer 1117844dc669SChristoph Hellwig if (!file && !mddev->bitmap_info.offset) { 1118935fe098SMike Snitzer /* No permanent bitmap - fill with '1s'. */ 1119935fe098SMike Snitzer store->filemap = NULL; 1120935fe098SMike Snitzer store->file_pages = 0; 1121935fe098SMike Snitzer for (i = 0; i < chunks ; i++) { 1122935fe098SMike Snitzer /* if the disk bit is set, set the memory bit */ 1123935fe098SMike Snitzer int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift) 1124935fe098SMike Snitzer >= start); 1125e64e4018SAndy Shevchenko md_bitmap_set_memory_bits(bitmap, 1126935fe098SMike Snitzer (sector_t)i << bitmap->counts.chunkshift, 1127935fe098SMike Snitzer needed); 1128935fe098SMike Snitzer } 1129935fe098SMike Snitzer return 0; 1130935fe098SMike Snitzer } 1131935fe098SMike Snitzer 1132935fe098SMike Snitzer if (file && i_size_read(file->f_mapping->host) < store->bytes) { 1133935fe098SMike Snitzer pr_warn("%s: bitmap file too short %lu < %lu\n", 1134935fe098SMike Snitzer bmname(bitmap), 1135935fe098SMike Snitzer (unsigned long) i_size_read(file->f_mapping->host), 1136935fe098SMike Snitzer store->bytes); 1137844dc669SChristoph Hellwig ret = -ENOSPC; 1138935fe098SMike Snitzer goto err; 1139935fe098SMike Snitzer } 1140935fe098SMike Snitzer 1141844dc669SChristoph Hellwig if (mddev_is_clustered(mddev)) 1142935fe098SMike Snitzer node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE)); 1143935fe098SMike Snitzer 1144844dc669SChristoph Hellwig for (i = 0; i < store->file_pages; i++) { 1145844dc669SChristoph Hellwig struct page *page = store->filemap[i]; 1146935fe098SMike Snitzer int count; 1147844dc669SChristoph Hellwig 1148935fe098SMike Snitzer /* unmap the old page, we're done with it */ 1149844dc669SChristoph Hellwig if (i == store->file_pages - 1) 1150844dc669SChristoph Hellwig count = store->bytes - i * PAGE_SIZE; 1151935fe098SMike Snitzer else 1152935fe098SMike Snitzer count = PAGE_SIZE; 1153935fe098SMike Snitzer 1154844dc669SChristoph Hellwig if (file) 1155844dc669SChristoph Hellwig ret = read_file_page(file, i, bitmap, count, page); 1156844dc669SChristoph Hellwig else 1157f5f2d5acSChristoph Hellwig ret = read_sb_page(mddev, 0, page, i + node_offset, 1158f5f2d5acSChristoph Hellwig count); 1159935fe098SMike Snitzer if (ret) 1160935fe098SMike Snitzer goto err; 1161844dc669SChristoph Hellwig } 1162935fe098SMike Snitzer 1163935fe098SMike Snitzer if (outofdate) { 1164844dc669SChristoph Hellwig pr_warn("%s: bitmap file is out of date, doing full recovery\n", 1165844dc669SChristoph Hellwig bmname(bitmap)); 1166844dc669SChristoph Hellwig 1167844dc669SChristoph Hellwig for (i = 0; i < store->file_pages; i++) { 1168844dc669SChristoph Hellwig struct page *page = store->filemap[i]; 1169844dc669SChristoph Hellwig unsigned long offset = 0; 1170844dc669SChristoph Hellwig void *paddr; 1171844dc669SChristoph Hellwig 1172844dc669SChristoph Hellwig if (i == 0 && !mddev->bitmap_info.external) 1173844dc669SChristoph Hellwig offset = sizeof(bitmap_super_t); 1174844dc669SChristoph Hellwig 1175935fe098SMike Snitzer /* 1176844dc669SChristoph Hellwig * If the bitmap is out of date, dirty the whole page 1177844dc669SChristoph Hellwig * and write it out 1178935fe098SMike Snitzer */ 1179935fe098SMike Snitzer paddr = kmap_atomic(page); 1180844dc669SChristoph Hellwig memset(paddr + offset, 0xff, PAGE_SIZE - offset); 1181935fe098SMike Snitzer kunmap_atomic(paddr); 1182935fe098SMike Snitzer 1183d7038f95SChristoph Hellwig filemap_write_page(bitmap, i, true); 1184844dc669SChristoph Hellwig if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) { 1185935fe098SMike Snitzer ret = -EIO; 1186935fe098SMike Snitzer goto err; 1187935fe098SMike Snitzer } 1188935fe098SMike Snitzer } 1189844dc669SChristoph Hellwig } 1190844dc669SChristoph Hellwig 1191844dc669SChristoph Hellwig for (i = 0; i < chunks; i++) { 1192844dc669SChristoph Hellwig struct page *page = filemap_get_page(&bitmap->storage, i); 1193844dc669SChristoph Hellwig unsigned long bit = file_page_offset(&bitmap->storage, i); 1194844dc669SChristoph Hellwig void *paddr; 1195844dc669SChristoph Hellwig bool was_set; 1196844dc669SChristoph Hellwig 1197935fe098SMike Snitzer paddr = kmap_atomic(page); 1198935fe098SMike Snitzer if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) 1199844dc669SChristoph Hellwig was_set = test_bit(bit, paddr); 1200935fe098SMike Snitzer else 1201844dc669SChristoph Hellwig was_set = test_bit_le(bit, paddr); 1202935fe098SMike Snitzer kunmap_atomic(paddr); 1203844dc669SChristoph Hellwig 1204844dc669SChristoph Hellwig if (was_set) { 1205935fe098SMike Snitzer /* if the disk bit is set, set the memory bit */ 1206935fe098SMike Snitzer int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift 1207935fe098SMike Snitzer >= start); 1208e64e4018SAndy Shevchenko md_bitmap_set_memory_bits(bitmap, 1209935fe098SMike Snitzer (sector_t)i << bitmap->counts.chunkshift, 1210935fe098SMike Snitzer needed); 1211935fe098SMike Snitzer bit_cnt++; 1212935fe098SMike Snitzer } 1213935fe098SMike Snitzer } 1214935fe098SMike Snitzer 1215935fe098SMike Snitzer pr_debug("%s: bitmap initialized from disk: read %lu pages, set %lu of %lu bits\n", 1216935fe098SMike Snitzer bmname(bitmap), store->file_pages, 1217935fe098SMike Snitzer bit_cnt, chunks); 1218935fe098SMike Snitzer 1219935fe098SMike Snitzer return 0; 1220935fe098SMike Snitzer 1221935fe098SMike Snitzer err: 1222935fe098SMike Snitzer pr_warn("%s: bitmap initialisation failed: %d\n", 1223935fe098SMike Snitzer bmname(bitmap), ret); 1224935fe098SMike Snitzer return ret; 1225935fe098SMike Snitzer } 1226935fe098SMike Snitzer 1227e64e4018SAndy Shevchenko void md_bitmap_write_all(struct bitmap *bitmap) 1228935fe098SMike Snitzer { 1229935fe098SMike Snitzer /* We don't actually write all bitmap blocks here, 1230935fe098SMike Snitzer * just flag them as needing to be written 1231935fe098SMike Snitzer */ 1232935fe098SMike Snitzer int i; 1233935fe098SMike Snitzer 1234935fe098SMike Snitzer if (!bitmap || !bitmap->storage.filemap) 1235935fe098SMike Snitzer return; 1236935fe098SMike Snitzer if (bitmap->storage.file) 1237935fe098SMike Snitzer /* Only one copy, so nothing needed */ 1238935fe098SMike Snitzer return; 1239935fe098SMike Snitzer 1240935fe098SMike Snitzer for (i = 0; i < bitmap->storage.file_pages; i++) 1241935fe098SMike Snitzer set_page_attr(bitmap, i, 1242935fe098SMike Snitzer BITMAP_PAGE_NEEDWRITE); 1243935fe098SMike Snitzer bitmap->allclean = 0; 1244935fe098SMike Snitzer } 1245935fe098SMike Snitzer 1246e64e4018SAndy Shevchenko static void md_bitmap_count_page(struct bitmap_counts *bitmap, 1247935fe098SMike Snitzer sector_t offset, int inc) 1248935fe098SMike Snitzer { 1249935fe098SMike Snitzer sector_t chunk = offset >> bitmap->chunkshift; 1250935fe098SMike Snitzer unsigned long page = chunk >> PAGE_COUNTER_SHIFT; 1251935fe098SMike Snitzer bitmap->bp[page].count += inc; 1252e64e4018SAndy Shevchenko md_bitmap_checkfree(bitmap, page); 1253935fe098SMike Snitzer } 1254935fe098SMike Snitzer 1255e64e4018SAndy Shevchenko static void md_bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset) 1256935fe098SMike Snitzer { 1257935fe098SMike Snitzer sector_t chunk = offset >> bitmap->chunkshift; 1258935fe098SMike Snitzer unsigned long page = chunk >> PAGE_COUNTER_SHIFT; 1259935fe098SMike Snitzer struct bitmap_page *bp = &bitmap->bp[page]; 1260935fe098SMike Snitzer 1261935fe098SMike Snitzer if (!bp->pending) 1262935fe098SMike Snitzer bp->pending = 1; 1263935fe098SMike Snitzer } 1264935fe098SMike Snitzer 1265e64e4018SAndy Shevchenko static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap, 1266935fe098SMike Snitzer sector_t offset, sector_t *blocks, 1267935fe098SMike Snitzer int create); 1268935fe098SMike Snitzer 12694eeb6535SYu Kuai static void mddev_set_timeout(struct mddev *mddev, unsigned long timeout, 12704eeb6535SYu Kuai bool force) 12714eeb6535SYu Kuai { 127244693154SYu Kuai struct md_thread *thread; 127344693154SYu Kuai 127444693154SYu Kuai rcu_read_lock(); 127544693154SYu Kuai thread = rcu_dereference(mddev->thread); 12764eeb6535SYu Kuai 12774eeb6535SYu Kuai if (!thread) 127844693154SYu Kuai goto out; 12794eeb6535SYu Kuai 12804eeb6535SYu Kuai if (force || thread->timeout < MAX_SCHEDULE_TIMEOUT) 12814eeb6535SYu Kuai thread->timeout = timeout; 128244693154SYu Kuai 128344693154SYu Kuai out: 128444693154SYu Kuai rcu_read_unlock(); 12854eeb6535SYu Kuai } 12864eeb6535SYu Kuai 1287935fe098SMike Snitzer /* 1288935fe098SMike Snitzer * bitmap daemon -- periodically wakes up to clean bits and flush pages 1289935fe098SMike Snitzer * out to disk 1290935fe098SMike Snitzer */ 1291e64e4018SAndy Shevchenko void md_bitmap_daemon_work(struct mddev *mddev) 1292935fe098SMike Snitzer { 1293935fe098SMike Snitzer struct bitmap *bitmap; 1294935fe098SMike Snitzer unsigned long j; 1295935fe098SMike Snitzer unsigned long nextpage; 1296935fe098SMike Snitzer sector_t blocks; 1297935fe098SMike Snitzer struct bitmap_counts *counts; 1298935fe098SMike Snitzer 1299935fe098SMike Snitzer /* Use a mutex to guard daemon_work against 1300935fe098SMike Snitzer * bitmap_destroy. 1301935fe098SMike Snitzer */ 1302935fe098SMike Snitzer mutex_lock(&mddev->bitmap_info.mutex); 1303935fe098SMike Snitzer bitmap = mddev->bitmap; 1304935fe098SMike Snitzer if (bitmap == NULL) { 1305935fe098SMike Snitzer mutex_unlock(&mddev->bitmap_info.mutex); 1306935fe098SMike Snitzer return; 1307935fe098SMike Snitzer } 1308935fe098SMike Snitzer if (time_before(jiffies, bitmap->daemon_lastrun 1309935fe098SMike Snitzer + mddev->bitmap_info.daemon_sleep)) 1310935fe098SMike Snitzer goto done; 1311935fe098SMike Snitzer 1312935fe098SMike Snitzer bitmap->daemon_lastrun = jiffies; 1313935fe098SMike Snitzer if (bitmap->allclean) { 13144eeb6535SYu Kuai mddev_set_timeout(mddev, MAX_SCHEDULE_TIMEOUT, true); 1315935fe098SMike Snitzer goto done; 1316935fe098SMike Snitzer } 1317935fe098SMike Snitzer bitmap->allclean = 1; 1318935fe098SMike Snitzer 1319935fe098SMike Snitzer if (bitmap->mddev->queue) 1320935fe098SMike Snitzer blk_add_trace_msg(bitmap->mddev->queue, 1321935fe098SMike Snitzer "md bitmap_daemon_work"); 1322935fe098SMike Snitzer 1323935fe098SMike Snitzer /* Any file-page which is PENDING now needs to be written. 1324935fe098SMike Snitzer * So set NEEDWRITE now, then after we make any last-minute changes 1325935fe098SMike Snitzer * we will write it. 1326935fe098SMike Snitzer */ 1327935fe098SMike Snitzer for (j = 0; j < bitmap->storage.file_pages; j++) 1328935fe098SMike Snitzer if (test_and_clear_page_attr(bitmap, j, 1329935fe098SMike Snitzer BITMAP_PAGE_PENDING)) 1330935fe098SMike Snitzer set_page_attr(bitmap, j, 1331935fe098SMike Snitzer BITMAP_PAGE_NEEDWRITE); 1332935fe098SMike Snitzer 1333935fe098SMike Snitzer if (bitmap->need_sync && 1334935fe098SMike Snitzer mddev->bitmap_info.external == 0) { 1335935fe098SMike Snitzer /* Arrange for superblock update as well as 1336935fe098SMike Snitzer * other changes */ 1337935fe098SMike Snitzer bitmap_super_t *sb; 1338935fe098SMike Snitzer bitmap->need_sync = 0; 1339935fe098SMike Snitzer if (bitmap->storage.filemap) { 1340935fe098SMike Snitzer sb = kmap_atomic(bitmap->storage.sb_page); 1341935fe098SMike Snitzer sb->events_cleared = 1342935fe098SMike Snitzer cpu_to_le64(bitmap->events_cleared); 1343935fe098SMike Snitzer kunmap_atomic(sb); 1344935fe098SMike Snitzer set_page_attr(bitmap, 0, 1345935fe098SMike Snitzer BITMAP_PAGE_NEEDWRITE); 1346935fe098SMike Snitzer } 1347935fe098SMike Snitzer } 1348935fe098SMike Snitzer /* Now look at the bitmap counters and if any are '2' or '1', 1349935fe098SMike Snitzer * decrement and handle accordingly. 1350935fe098SMike Snitzer */ 1351935fe098SMike Snitzer counts = &bitmap->counts; 1352935fe098SMike Snitzer spin_lock_irq(&counts->lock); 1353935fe098SMike Snitzer nextpage = 0; 1354935fe098SMike Snitzer for (j = 0; j < counts->chunks; j++) { 1355935fe098SMike Snitzer bitmap_counter_t *bmc; 1356935fe098SMike Snitzer sector_t block = (sector_t)j << counts->chunkshift; 1357935fe098SMike Snitzer 1358935fe098SMike Snitzer if (j == nextpage) { 1359935fe098SMike Snitzer nextpage += PAGE_COUNTER_RATIO; 1360935fe098SMike Snitzer if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) { 1361935fe098SMike Snitzer j |= PAGE_COUNTER_MASK; 1362935fe098SMike Snitzer continue; 1363935fe098SMike Snitzer } 1364935fe098SMike Snitzer counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; 1365935fe098SMike Snitzer } 1366935fe098SMike Snitzer 1367e64e4018SAndy Shevchenko bmc = md_bitmap_get_counter(counts, block, &blocks, 0); 1368935fe098SMike Snitzer if (!bmc) { 1369935fe098SMike Snitzer j |= PAGE_COUNTER_MASK; 1370935fe098SMike Snitzer continue; 1371935fe098SMike Snitzer } 1372935fe098SMike Snitzer if (*bmc == 1 && !bitmap->need_sync) { 1373935fe098SMike Snitzer /* We can clear the bit */ 1374935fe098SMike Snitzer *bmc = 0; 1375e64e4018SAndy Shevchenko md_bitmap_count_page(counts, block, -1); 1376e64e4018SAndy Shevchenko md_bitmap_file_clear_bit(bitmap, block); 1377935fe098SMike Snitzer } else if (*bmc && *bmc <= 2) { 1378935fe098SMike Snitzer *bmc = 1; 1379e64e4018SAndy Shevchenko md_bitmap_set_pending(counts, block); 1380935fe098SMike Snitzer bitmap->allclean = 0; 1381935fe098SMike Snitzer } 1382935fe098SMike Snitzer } 1383935fe098SMike Snitzer spin_unlock_irq(&counts->lock); 1384935fe098SMike Snitzer 1385e64e4018SAndy Shevchenko md_bitmap_wait_writes(bitmap); 1386935fe098SMike Snitzer /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. 1387935fe098SMike Snitzer * DIRTY pages need to be written by bitmap_unplug so it can wait 1388935fe098SMike Snitzer * for them. 1389935fe098SMike Snitzer * If we find any DIRTY page we stop there and let bitmap_unplug 1390935fe098SMike Snitzer * handle all the rest. This is important in the case where 1391935fe098SMike Snitzer * the first blocking holds the superblock and it has been updated. 1392935fe098SMike Snitzer * We mustn't write any other blocks before the superblock. 1393935fe098SMike Snitzer */ 1394935fe098SMike Snitzer for (j = 0; 1395935fe098SMike Snitzer j < bitmap->storage.file_pages 1396935fe098SMike Snitzer && !test_bit(BITMAP_STALE, &bitmap->flags); 1397935fe098SMike Snitzer j++) { 1398935fe098SMike Snitzer if (test_page_attr(bitmap, j, 1399935fe098SMike Snitzer BITMAP_PAGE_DIRTY)) 1400935fe098SMike Snitzer /* bitmap_unplug will handle the rest */ 1401935fe098SMike Snitzer break; 140255180498SZhiqiang Liu if (bitmap->storage.filemap && 140355180498SZhiqiang Liu test_and_clear_page_attr(bitmap, j, 1404d7038f95SChristoph Hellwig BITMAP_PAGE_NEEDWRITE)) 1405d7038f95SChristoph Hellwig filemap_write_page(bitmap, j, false); 1406935fe098SMike Snitzer } 1407935fe098SMike Snitzer 1408935fe098SMike Snitzer done: 1409935fe098SMike Snitzer if (bitmap->allclean == 0) 14104eeb6535SYu Kuai mddev_set_timeout(mddev, mddev->bitmap_info.daemon_sleep, true); 1411935fe098SMike Snitzer mutex_unlock(&mddev->bitmap_info.mutex); 1412935fe098SMike Snitzer } 1413935fe098SMike Snitzer 1414e64e4018SAndy Shevchenko static bitmap_counter_t *md_bitmap_get_counter(struct bitmap_counts *bitmap, 1415935fe098SMike Snitzer sector_t offset, sector_t *blocks, 1416935fe098SMike Snitzer int create) 1417935fe098SMike Snitzer __releases(bitmap->lock) 1418935fe098SMike Snitzer __acquires(bitmap->lock) 1419935fe098SMike Snitzer { 1420935fe098SMike Snitzer /* If 'create', we might release the lock and reclaim it. 1421935fe098SMike Snitzer * The lock must have been taken with interrupts enabled. 1422935fe098SMike Snitzer * If !create, we don't release the lock. 1423935fe098SMike Snitzer */ 1424935fe098SMike Snitzer sector_t chunk = offset >> bitmap->chunkshift; 1425935fe098SMike Snitzer unsigned long page = chunk >> PAGE_COUNTER_SHIFT; 1426935fe098SMike Snitzer unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; 1427935fe098SMike Snitzer sector_t csize; 1428935fe098SMike Snitzer int err; 1429935fe098SMike Snitzer 1430301867b1SLi Nan if (page >= bitmap->pages) { 1431301867b1SLi Nan /* 1432301867b1SLi Nan * This can happen if bitmap_start_sync goes beyond 1433301867b1SLi Nan * End-of-device while looking for a whole page or 1434301867b1SLi Nan * user set a huge number to sysfs bitmap_set_bits. 1435301867b1SLi Nan */ 1436301867b1SLi Nan return NULL; 1437301867b1SLi Nan } 1438e64e4018SAndy Shevchenko err = md_bitmap_checkpage(bitmap, page, create, 0); 1439935fe098SMike Snitzer 1440935fe098SMike Snitzer if (bitmap->bp[page].hijacked || 1441935fe098SMike Snitzer bitmap->bp[page].map == NULL) 1442935fe098SMike Snitzer csize = ((sector_t)1) << (bitmap->chunkshift + 1443d837f727SZhao Heming PAGE_COUNTER_SHIFT); 1444935fe098SMike Snitzer else 1445935fe098SMike Snitzer csize = ((sector_t)1) << bitmap->chunkshift; 1446935fe098SMike Snitzer *blocks = csize - (offset & (csize - 1)); 1447935fe098SMike Snitzer 1448935fe098SMike Snitzer if (err < 0) 1449935fe098SMike Snitzer return NULL; 1450935fe098SMike Snitzer 1451935fe098SMike Snitzer /* now locked ... */ 1452935fe098SMike Snitzer 1453935fe098SMike Snitzer if (bitmap->bp[page].hijacked) { /* hijacked pointer */ 1454935fe098SMike Snitzer /* should we use the first or second counter field 1455935fe098SMike Snitzer * of the hijacked pointer? */ 1456935fe098SMike Snitzer int hi = (pageoff > PAGE_COUNTER_MASK); 1457935fe098SMike Snitzer return &((bitmap_counter_t *) 1458935fe098SMike Snitzer &bitmap->bp[page].map)[hi]; 1459935fe098SMike Snitzer } else /* page is allocated */ 1460935fe098SMike Snitzer return (bitmap_counter_t *) 1461935fe098SMike Snitzer &(bitmap->bp[page].map[pageoff]); 1462935fe098SMike Snitzer } 1463935fe098SMike Snitzer 1464e64e4018SAndy Shevchenko int md_bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) 1465935fe098SMike Snitzer { 1466935fe098SMike Snitzer if (!bitmap) 1467935fe098SMike Snitzer return 0; 1468935fe098SMike Snitzer 1469935fe098SMike Snitzer if (behind) { 1470935fe098SMike Snitzer int bw; 1471935fe098SMike Snitzer atomic_inc(&bitmap->behind_writes); 1472935fe098SMike Snitzer bw = atomic_read(&bitmap->behind_writes); 1473935fe098SMike Snitzer if (bw > bitmap->behind_writes_used) 1474935fe098SMike Snitzer bitmap->behind_writes_used = bw; 1475935fe098SMike Snitzer 1476935fe098SMike Snitzer pr_debug("inc write-behind count %d/%lu\n", 1477935fe098SMike Snitzer bw, bitmap->mddev->bitmap_info.max_write_behind); 1478935fe098SMike Snitzer } 1479935fe098SMike Snitzer 1480935fe098SMike Snitzer while (sectors) { 1481935fe098SMike Snitzer sector_t blocks; 1482935fe098SMike Snitzer bitmap_counter_t *bmc; 1483935fe098SMike Snitzer 1484935fe098SMike Snitzer spin_lock_irq(&bitmap->counts.lock); 1485e64e4018SAndy Shevchenko bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 1); 1486935fe098SMike Snitzer if (!bmc) { 1487935fe098SMike Snitzer spin_unlock_irq(&bitmap->counts.lock); 1488935fe098SMike Snitzer return 0; 1489935fe098SMike Snitzer } 1490935fe098SMike Snitzer 1491935fe098SMike Snitzer if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { 1492935fe098SMike Snitzer DEFINE_WAIT(__wait); 1493935fe098SMike Snitzer /* note that it is safe to do the prepare_to_wait 1494935fe098SMike Snitzer * after the test as long as we do it before dropping 1495935fe098SMike Snitzer * the spinlock. 1496935fe098SMike Snitzer */ 1497935fe098SMike Snitzer prepare_to_wait(&bitmap->overflow_wait, &__wait, 1498935fe098SMike Snitzer TASK_UNINTERRUPTIBLE); 1499935fe098SMike Snitzer spin_unlock_irq(&bitmap->counts.lock); 1500935fe098SMike Snitzer schedule(); 1501935fe098SMike Snitzer finish_wait(&bitmap->overflow_wait, &__wait); 1502935fe098SMike Snitzer continue; 1503935fe098SMike Snitzer } 1504935fe098SMike Snitzer 1505935fe098SMike Snitzer switch (*bmc) { 1506935fe098SMike Snitzer case 0: 1507e64e4018SAndy Shevchenko md_bitmap_file_set_bit(bitmap, offset); 1508e64e4018SAndy Shevchenko md_bitmap_count_page(&bitmap->counts, offset, 1); 1509df561f66SGustavo A. R. Silva fallthrough; 1510935fe098SMike Snitzer case 1: 1511935fe098SMike Snitzer *bmc = 2; 1512935fe098SMike Snitzer } 1513935fe098SMike Snitzer 1514935fe098SMike Snitzer (*bmc)++; 1515935fe098SMike Snitzer 1516935fe098SMike Snitzer spin_unlock_irq(&bitmap->counts.lock); 1517935fe098SMike Snitzer 1518935fe098SMike Snitzer offset += blocks; 1519935fe098SMike Snitzer if (sectors > blocks) 1520935fe098SMike Snitzer sectors -= blocks; 1521935fe098SMike Snitzer else 1522935fe098SMike Snitzer sectors = 0; 1523935fe098SMike Snitzer } 1524935fe098SMike Snitzer return 0; 1525935fe098SMike Snitzer } 1526e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_startwrite); 1527935fe098SMike Snitzer 1528e64e4018SAndy Shevchenko void md_bitmap_endwrite(struct bitmap *bitmap, sector_t offset, 1529e64e4018SAndy Shevchenko unsigned long sectors, int success, int behind) 1530935fe098SMike Snitzer { 1531935fe098SMike Snitzer if (!bitmap) 1532935fe098SMike Snitzer return; 1533935fe098SMike Snitzer if (behind) { 1534935fe098SMike Snitzer if (atomic_dec_and_test(&bitmap->behind_writes)) 1535935fe098SMike Snitzer wake_up(&bitmap->behind_wait); 1536935fe098SMike Snitzer pr_debug("dec write-behind count %d/%lu\n", 1537935fe098SMike Snitzer atomic_read(&bitmap->behind_writes), 1538935fe098SMike Snitzer bitmap->mddev->bitmap_info.max_write_behind); 1539935fe098SMike Snitzer } 1540935fe098SMike Snitzer 1541935fe098SMike Snitzer while (sectors) { 1542935fe098SMike Snitzer sector_t blocks; 1543935fe098SMike Snitzer unsigned long flags; 1544935fe098SMike Snitzer bitmap_counter_t *bmc; 1545935fe098SMike Snitzer 1546935fe098SMike Snitzer spin_lock_irqsave(&bitmap->counts.lock, flags); 1547e64e4018SAndy Shevchenko bmc = md_bitmap_get_counter(&bitmap->counts, offset, &blocks, 0); 1548935fe098SMike Snitzer if (!bmc) { 1549935fe098SMike Snitzer spin_unlock_irqrestore(&bitmap->counts.lock, flags); 1550935fe098SMike Snitzer return; 1551935fe098SMike Snitzer } 1552935fe098SMike Snitzer 1553935fe098SMike Snitzer if (success && !bitmap->mddev->degraded && 1554935fe098SMike Snitzer bitmap->events_cleared < bitmap->mddev->events) { 1555935fe098SMike Snitzer bitmap->events_cleared = bitmap->mddev->events; 1556935fe098SMike Snitzer bitmap->need_sync = 1; 1557935fe098SMike Snitzer sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); 1558935fe098SMike Snitzer } 1559935fe098SMike Snitzer 1560935fe098SMike Snitzer if (!success && !NEEDED(*bmc)) 1561935fe098SMike Snitzer *bmc |= NEEDED_MASK; 1562935fe098SMike Snitzer 1563935fe098SMike Snitzer if (COUNTER(*bmc) == COUNTER_MAX) 1564935fe098SMike Snitzer wake_up(&bitmap->overflow_wait); 1565935fe098SMike Snitzer 1566935fe098SMike Snitzer (*bmc)--; 1567935fe098SMike Snitzer if (*bmc <= 2) { 1568e64e4018SAndy Shevchenko md_bitmap_set_pending(&bitmap->counts, offset); 1569935fe098SMike Snitzer bitmap->allclean = 0; 1570935fe098SMike Snitzer } 1571935fe098SMike Snitzer spin_unlock_irqrestore(&bitmap->counts.lock, flags); 1572935fe098SMike Snitzer offset += blocks; 1573935fe098SMike Snitzer if (sectors > blocks) 1574935fe098SMike Snitzer sectors -= blocks; 1575935fe098SMike Snitzer else 1576935fe098SMike Snitzer sectors = 0; 1577935fe098SMike Snitzer } 1578935fe098SMike Snitzer } 1579e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_endwrite); 1580935fe098SMike Snitzer 1581935fe098SMike Snitzer static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, 1582935fe098SMike Snitzer int degraded) 1583935fe098SMike Snitzer { 1584935fe098SMike Snitzer bitmap_counter_t *bmc; 1585935fe098SMike Snitzer int rv; 1586935fe098SMike Snitzer if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ 1587935fe098SMike Snitzer *blocks = 1024; 1588935fe098SMike Snitzer return 1; /* always resync if no bitmap */ 1589935fe098SMike Snitzer } 1590935fe098SMike Snitzer spin_lock_irq(&bitmap->counts.lock); 1591e64e4018SAndy Shevchenko bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0); 1592935fe098SMike Snitzer rv = 0; 1593935fe098SMike Snitzer if (bmc) { 1594935fe098SMike Snitzer /* locked */ 1595935fe098SMike Snitzer if (RESYNC(*bmc)) 1596935fe098SMike Snitzer rv = 1; 1597935fe098SMike Snitzer else if (NEEDED(*bmc)) { 1598935fe098SMike Snitzer rv = 1; 1599935fe098SMike Snitzer if (!degraded) { /* don't set/clear bits if degraded */ 1600935fe098SMike Snitzer *bmc |= RESYNC_MASK; 1601935fe098SMike Snitzer *bmc &= ~NEEDED_MASK; 1602935fe098SMike Snitzer } 1603935fe098SMike Snitzer } 1604935fe098SMike Snitzer } 1605935fe098SMike Snitzer spin_unlock_irq(&bitmap->counts.lock); 1606935fe098SMike Snitzer return rv; 1607935fe098SMike Snitzer } 1608935fe098SMike Snitzer 1609e64e4018SAndy Shevchenko int md_bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, 1610935fe098SMike Snitzer int degraded) 1611935fe098SMike Snitzer { 1612935fe098SMike Snitzer /* bitmap_start_sync must always report on multiples of whole 1613935fe098SMike Snitzer * pages, otherwise resync (which is very PAGE_SIZE based) will 1614935fe098SMike Snitzer * get confused. 1615935fe098SMike Snitzer * So call __bitmap_start_sync repeatedly (if needed) until 1616935fe098SMike Snitzer * At least PAGE_SIZE>>9 blocks are covered. 1617935fe098SMike Snitzer * Return the 'or' of the result. 1618935fe098SMike Snitzer */ 1619935fe098SMike Snitzer int rv = 0; 1620935fe098SMike Snitzer sector_t blocks1; 1621935fe098SMike Snitzer 1622935fe098SMike Snitzer *blocks = 0; 1623935fe098SMike Snitzer while (*blocks < (PAGE_SIZE>>9)) { 1624935fe098SMike Snitzer rv |= __bitmap_start_sync(bitmap, offset, 1625935fe098SMike Snitzer &blocks1, degraded); 1626935fe098SMike Snitzer offset += blocks1; 1627935fe098SMike Snitzer *blocks += blocks1; 1628935fe098SMike Snitzer } 1629935fe098SMike Snitzer return rv; 1630935fe098SMike Snitzer } 1631e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_start_sync); 1632935fe098SMike Snitzer 1633e64e4018SAndy Shevchenko void md_bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) 1634935fe098SMike Snitzer { 1635935fe098SMike Snitzer bitmap_counter_t *bmc; 1636935fe098SMike Snitzer unsigned long flags; 1637935fe098SMike Snitzer 1638935fe098SMike Snitzer if (bitmap == NULL) { 1639935fe098SMike Snitzer *blocks = 1024; 1640935fe098SMike Snitzer return; 1641935fe098SMike Snitzer } 1642935fe098SMike Snitzer spin_lock_irqsave(&bitmap->counts.lock, flags); 1643e64e4018SAndy Shevchenko bmc = md_bitmap_get_counter(&bitmap->counts, offset, blocks, 0); 1644935fe098SMike Snitzer if (bmc == NULL) 1645935fe098SMike Snitzer goto unlock; 1646935fe098SMike Snitzer /* locked */ 1647935fe098SMike Snitzer if (RESYNC(*bmc)) { 1648935fe098SMike Snitzer *bmc &= ~RESYNC_MASK; 1649935fe098SMike Snitzer 1650935fe098SMike Snitzer if (!NEEDED(*bmc) && aborted) 1651935fe098SMike Snitzer *bmc |= NEEDED_MASK; 1652935fe098SMike Snitzer else { 1653935fe098SMike Snitzer if (*bmc <= 2) { 1654e64e4018SAndy Shevchenko md_bitmap_set_pending(&bitmap->counts, offset); 1655935fe098SMike Snitzer bitmap->allclean = 0; 1656935fe098SMike Snitzer } 1657935fe098SMike Snitzer } 1658935fe098SMike Snitzer } 1659935fe098SMike Snitzer unlock: 1660935fe098SMike Snitzer spin_unlock_irqrestore(&bitmap->counts.lock, flags); 1661935fe098SMike Snitzer } 1662e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_end_sync); 1663935fe098SMike Snitzer 1664e64e4018SAndy Shevchenko void md_bitmap_close_sync(struct bitmap *bitmap) 1665935fe098SMike Snitzer { 1666935fe098SMike Snitzer /* Sync has finished, and any bitmap chunks that weren't synced 1667935fe098SMike Snitzer * properly have been aborted. It remains to us to clear the 1668935fe098SMike Snitzer * RESYNC bit wherever it is still on 1669935fe098SMike Snitzer */ 1670935fe098SMike Snitzer sector_t sector = 0; 1671935fe098SMike Snitzer sector_t blocks; 1672935fe098SMike Snitzer if (!bitmap) 1673935fe098SMike Snitzer return; 1674935fe098SMike Snitzer while (sector < bitmap->mddev->resync_max_sectors) { 1675e64e4018SAndy Shevchenko md_bitmap_end_sync(bitmap, sector, &blocks, 0); 1676935fe098SMike Snitzer sector += blocks; 1677935fe098SMike Snitzer } 1678935fe098SMike Snitzer } 1679e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_close_sync); 1680935fe098SMike Snitzer 1681e64e4018SAndy Shevchenko void md_bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force) 1682935fe098SMike Snitzer { 1683935fe098SMike Snitzer sector_t s = 0; 1684935fe098SMike Snitzer sector_t blocks; 1685935fe098SMike Snitzer 1686935fe098SMike Snitzer if (!bitmap) 1687935fe098SMike Snitzer return; 1688935fe098SMike Snitzer if (sector == 0) { 1689935fe098SMike Snitzer bitmap->last_end_sync = jiffies; 1690935fe098SMike Snitzer return; 1691935fe098SMike Snitzer } 1692935fe098SMike Snitzer if (!force && time_before(jiffies, (bitmap->last_end_sync 1693935fe098SMike Snitzer + bitmap->mddev->bitmap_info.daemon_sleep))) 1694935fe098SMike Snitzer return; 1695935fe098SMike Snitzer wait_event(bitmap->mddev->recovery_wait, 1696935fe098SMike Snitzer atomic_read(&bitmap->mddev->recovery_active) == 0); 1697935fe098SMike Snitzer 1698935fe098SMike Snitzer bitmap->mddev->curr_resync_completed = sector; 1699935fe098SMike Snitzer set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags); 1700935fe098SMike Snitzer sector &= ~((1ULL << bitmap->counts.chunkshift) - 1); 1701935fe098SMike Snitzer s = 0; 1702935fe098SMike Snitzer while (s < sector && s < bitmap->mddev->resync_max_sectors) { 1703e64e4018SAndy Shevchenko md_bitmap_end_sync(bitmap, s, &blocks, 0); 1704935fe098SMike Snitzer s += blocks; 1705935fe098SMike Snitzer } 1706935fe098SMike Snitzer bitmap->last_end_sync = jiffies; 1707e1a86dbbSJunxiao Bi sysfs_notify_dirent_safe(bitmap->mddev->sysfs_completed); 1708935fe098SMike Snitzer } 1709e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_cond_end_sync); 1710935fe098SMike Snitzer 1711e64e4018SAndy Shevchenko void md_bitmap_sync_with_cluster(struct mddev *mddev, 1712935fe098SMike Snitzer sector_t old_lo, sector_t old_hi, 1713935fe098SMike Snitzer sector_t new_lo, sector_t new_hi) 1714935fe098SMike Snitzer { 1715935fe098SMike Snitzer struct bitmap *bitmap = mddev->bitmap; 1716935fe098SMike Snitzer sector_t sector, blocks = 0; 1717935fe098SMike Snitzer 1718935fe098SMike Snitzer for (sector = old_lo; sector < new_lo; ) { 1719e64e4018SAndy Shevchenko md_bitmap_end_sync(bitmap, sector, &blocks, 0); 1720935fe098SMike Snitzer sector += blocks; 1721935fe098SMike Snitzer } 1722935fe098SMike Snitzer WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n"); 1723935fe098SMike Snitzer 1724935fe098SMike Snitzer for (sector = old_hi; sector < new_hi; ) { 1725e64e4018SAndy Shevchenko md_bitmap_start_sync(bitmap, sector, &blocks, 0); 1726935fe098SMike Snitzer sector += blocks; 1727935fe098SMike Snitzer } 1728935fe098SMike Snitzer WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n"); 1729935fe098SMike Snitzer } 1730e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_sync_with_cluster); 1731935fe098SMike Snitzer 1732e64e4018SAndy Shevchenko static void md_bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) 1733935fe098SMike Snitzer { 1734935fe098SMike Snitzer /* For each chunk covered by any of these sectors, set the 1735935fe098SMike Snitzer * counter to 2 and possibly set resync_needed. They should all 1736935fe098SMike Snitzer * be 0 at this point 1737935fe098SMike Snitzer */ 1738935fe098SMike Snitzer 1739935fe098SMike Snitzer sector_t secs; 1740935fe098SMike Snitzer bitmap_counter_t *bmc; 1741935fe098SMike Snitzer spin_lock_irq(&bitmap->counts.lock); 1742e64e4018SAndy Shevchenko bmc = md_bitmap_get_counter(&bitmap->counts, offset, &secs, 1); 1743935fe098SMike Snitzer if (!bmc) { 1744935fe098SMike Snitzer spin_unlock_irq(&bitmap->counts.lock); 1745935fe098SMike Snitzer return; 1746935fe098SMike Snitzer } 1747935fe098SMike Snitzer if (!*bmc) { 1748935fe098SMike Snitzer *bmc = 2; 1749e64e4018SAndy Shevchenko md_bitmap_count_page(&bitmap->counts, offset, 1); 1750e64e4018SAndy Shevchenko md_bitmap_set_pending(&bitmap->counts, offset); 1751935fe098SMike Snitzer bitmap->allclean = 0; 1752935fe098SMike Snitzer } 1753935fe098SMike Snitzer if (needed) 1754935fe098SMike Snitzer *bmc |= NEEDED_MASK; 1755935fe098SMike Snitzer spin_unlock_irq(&bitmap->counts.lock); 1756935fe098SMike Snitzer } 1757935fe098SMike Snitzer 1758935fe098SMike Snitzer /* dirty the memory and file bits for bitmap chunks "s" to "e" */ 1759e64e4018SAndy Shevchenko void md_bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) 1760935fe098SMike Snitzer { 1761935fe098SMike Snitzer unsigned long chunk; 1762935fe098SMike Snitzer 1763935fe098SMike Snitzer for (chunk = s; chunk <= e; chunk++) { 1764935fe098SMike Snitzer sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift; 1765e64e4018SAndy Shevchenko md_bitmap_set_memory_bits(bitmap, sec, 1); 1766e64e4018SAndy Shevchenko md_bitmap_file_set_bit(bitmap, sec); 1767935fe098SMike Snitzer if (sec < bitmap->mddev->recovery_cp) 1768935fe098SMike Snitzer /* We are asserting that the array is dirty, 1769935fe098SMike Snitzer * so move the recovery_cp address back so 1770935fe098SMike Snitzer * that it is obvious that it is dirty 1771935fe098SMike Snitzer */ 1772935fe098SMike Snitzer bitmap->mddev->recovery_cp = sec; 1773935fe098SMike Snitzer } 1774935fe098SMike Snitzer } 1775935fe098SMike Snitzer 1776935fe098SMike Snitzer /* 1777935fe098SMike Snitzer * flush out any pending updates 1778935fe098SMike Snitzer */ 1779e64e4018SAndy Shevchenko void md_bitmap_flush(struct mddev *mddev) 1780935fe098SMike Snitzer { 1781935fe098SMike Snitzer struct bitmap *bitmap = mddev->bitmap; 1782935fe098SMike Snitzer long sleep; 1783935fe098SMike Snitzer 1784935fe098SMike Snitzer if (!bitmap) /* there was no bitmap */ 1785935fe098SMike Snitzer return; 1786935fe098SMike Snitzer 1787935fe098SMike Snitzer /* run the daemon_work three time to ensure everything is flushed 1788935fe098SMike Snitzer * that can be 1789935fe098SMike Snitzer */ 1790935fe098SMike Snitzer sleep = mddev->bitmap_info.daemon_sleep * 2; 1791935fe098SMike Snitzer bitmap->daemon_lastrun -= sleep; 1792e64e4018SAndy Shevchenko md_bitmap_daemon_work(mddev); 1793935fe098SMike Snitzer bitmap->daemon_lastrun -= sleep; 1794e64e4018SAndy Shevchenko md_bitmap_daemon_work(mddev); 1795935fe098SMike Snitzer bitmap->daemon_lastrun -= sleep; 1796e64e4018SAndy Shevchenko md_bitmap_daemon_work(mddev); 1797404a8ef5SSudhakar Panneerselvam if (mddev->bitmap_info.external) 1798404a8ef5SSudhakar Panneerselvam md_super_wait(mddev); 1799e64e4018SAndy Shevchenko md_bitmap_update_sb(bitmap); 1800935fe098SMike Snitzer } 1801935fe098SMike Snitzer 1802935fe098SMike Snitzer /* 1803935fe098SMike Snitzer * free memory that was allocated 1804935fe098SMike Snitzer */ 1805e64e4018SAndy Shevchenko void md_bitmap_free(struct bitmap *bitmap) 1806935fe098SMike Snitzer { 1807935fe098SMike Snitzer unsigned long k, pages; 1808935fe098SMike Snitzer struct bitmap_page *bp; 1809935fe098SMike Snitzer 1810935fe098SMike Snitzer if (!bitmap) /* there was no bitmap */ 1811935fe098SMike Snitzer return; 1812935fe098SMike Snitzer 1813935fe098SMike Snitzer if (bitmap->sysfs_can_clear) 1814935fe098SMike Snitzer sysfs_put(bitmap->sysfs_can_clear); 1815935fe098SMike Snitzer 1816935fe098SMike Snitzer if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info && 1817935fe098SMike Snitzer bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev)) 1818935fe098SMike Snitzer md_cluster_stop(bitmap->mddev); 1819935fe098SMike Snitzer 1820935fe098SMike Snitzer /* Shouldn't be needed - but just in case.... */ 1821935fe098SMike Snitzer wait_event(bitmap->write_wait, 1822935fe098SMike Snitzer atomic_read(&bitmap->pending_writes) == 0); 1823935fe098SMike Snitzer 1824935fe098SMike Snitzer /* release the bitmap file */ 1825e64e4018SAndy Shevchenko md_bitmap_file_unmap(&bitmap->storage); 1826935fe098SMike Snitzer 1827935fe098SMike Snitzer bp = bitmap->counts.bp; 1828935fe098SMike Snitzer pages = bitmap->counts.pages; 1829935fe098SMike Snitzer 1830935fe098SMike Snitzer /* free all allocated memory */ 1831935fe098SMike Snitzer 1832935fe098SMike Snitzer if (bp) /* deallocate the page memory */ 1833935fe098SMike Snitzer for (k = 0; k < pages; k++) 1834935fe098SMike Snitzer if (bp[k].map && !bp[k].hijacked) 1835935fe098SMike Snitzer kfree(bp[k].map); 1836935fe098SMike Snitzer kfree(bp); 1837935fe098SMike Snitzer kfree(bitmap); 1838935fe098SMike Snitzer } 1839e64e4018SAndy Shevchenko EXPORT_SYMBOL(md_bitmap_free); 1840935fe098SMike Snitzer 1841e64e4018SAndy Shevchenko void md_bitmap_wait_behind_writes(struct mddev *mddev) 1842935fe098SMike Snitzer { 1843935fe098SMike Snitzer struct bitmap *bitmap = mddev->bitmap; 1844935fe098SMike Snitzer 1845935fe098SMike Snitzer /* wait for behind writes to complete */ 1846935fe098SMike Snitzer if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { 1847935fe098SMike Snitzer pr_debug("md:%s: behind writes in progress - waiting to stop.\n", 1848935fe098SMike Snitzer mdname(mddev)); 1849935fe098SMike Snitzer /* need to kick something here to make sure I/O goes? */ 1850935fe098SMike Snitzer wait_event(bitmap->behind_wait, 1851935fe098SMike Snitzer atomic_read(&bitmap->behind_writes) == 0); 1852935fe098SMike Snitzer } 1853935fe098SMike Snitzer } 1854935fe098SMike Snitzer 1855e64e4018SAndy Shevchenko void md_bitmap_destroy(struct mddev *mddev) 1856935fe098SMike Snitzer { 1857935fe098SMike Snitzer struct bitmap *bitmap = mddev->bitmap; 1858935fe098SMike Snitzer 1859935fe098SMike Snitzer if (!bitmap) /* there was no bitmap */ 1860935fe098SMike Snitzer return; 1861935fe098SMike Snitzer 1862e64e4018SAndy Shevchenko md_bitmap_wait_behind_writes(mddev); 186369b00b5bSGuoqing Jiang if (!mddev->serialize_policy) 186469b00b5bSGuoqing Jiang mddev_destroy_serial_pool(mddev, NULL, true); 1865935fe098SMike Snitzer 1866935fe098SMike Snitzer mutex_lock(&mddev->bitmap_info.mutex); 1867935fe098SMike Snitzer spin_lock(&mddev->lock); 1868935fe098SMike Snitzer mddev->bitmap = NULL; /* disconnect from the md device */ 1869935fe098SMike Snitzer spin_unlock(&mddev->lock); 1870935fe098SMike Snitzer mutex_unlock(&mddev->bitmap_info.mutex); 18714eeb6535SYu Kuai mddev_set_timeout(mddev, MAX_SCHEDULE_TIMEOUT, true); 1872935fe098SMike Snitzer 1873e64e4018SAndy Shevchenko md_bitmap_free(bitmap); 1874935fe098SMike Snitzer } 1875935fe098SMike Snitzer 1876935fe098SMike Snitzer /* 1877935fe098SMike Snitzer * initialize the bitmap structure 1878935fe098SMike Snitzer * if this returns an error, bitmap_destroy must be called to do clean up 1879935fe098SMike Snitzer * once mddev->bitmap is set 1880935fe098SMike Snitzer */ 1881e64e4018SAndy Shevchenko struct bitmap *md_bitmap_create(struct mddev *mddev, int slot) 1882935fe098SMike Snitzer { 1883935fe098SMike Snitzer struct bitmap *bitmap; 1884935fe098SMike Snitzer sector_t blocks = mddev->resync_max_sectors; 1885935fe098SMike Snitzer struct file *file = mddev->bitmap_info.file; 1886935fe098SMike Snitzer int err; 1887935fe098SMike Snitzer struct kernfs_node *bm = NULL; 1888935fe098SMike Snitzer 1889935fe098SMike Snitzer BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); 1890935fe098SMike Snitzer 1891935fe098SMike Snitzer BUG_ON(file && mddev->bitmap_info.offset); 1892935fe098SMike Snitzer 1893230b55faSNeilBrown if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { 1894230b55faSNeilBrown pr_notice("md/raid:%s: array with journal cannot have bitmap\n", 1895230b55faSNeilBrown mdname(mddev)); 1896230b55faSNeilBrown return ERR_PTR(-EBUSY); 1897230b55faSNeilBrown } 1898230b55faSNeilBrown 1899935fe098SMike Snitzer bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); 1900935fe098SMike Snitzer if (!bitmap) 1901935fe098SMike Snitzer return ERR_PTR(-ENOMEM); 1902935fe098SMike Snitzer 1903935fe098SMike Snitzer spin_lock_init(&bitmap->counts.lock); 1904935fe098SMike Snitzer atomic_set(&bitmap->pending_writes, 0); 1905935fe098SMike Snitzer init_waitqueue_head(&bitmap->write_wait); 1906935fe098SMike Snitzer init_waitqueue_head(&bitmap->overflow_wait); 1907935fe098SMike Snitzer init_waitqueue_head(&bitmap->behind_wait); 1908935fe098SMike Snitzer 1909935fe098SMike Snitzer bitmap->mddev = mddev; 1910935fe098SMike Snitzer bitmap->cluster_slot = slot; 1911935fe098SMike Snitzer 1912935fe098SMike Snitzer if (mddev->kobj.sd) 1913935fe098SMike Snitzer bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap"); 1914935fe098SMike Snitzer if (bm) { 1915935fe098SMike Snitzer bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear"); 1916935fe098SMike Snitzer sysfs_put(bm); 1917935fe098SMike Snitzer } else 1918935fe098SMike Snitzer bitmap->sysfs_can_clear = NULL; 1919935fe098SMike Snitzer 1920935fe098SMike Snitzer bitmap->storage.file = file; 1921935fe098SMike Snitzer if (file) { 1922935fe098SMike Snitzer get_file(file); 1923935fe098SMike Snitzer /* As future accesses to this file will use bmap, 1924935fe098SMike Snitzer * and bypass the page cache, we must sync the file 1925935fe098SMike Snitzer * first. 1926935fe098SMike Snitzer */ 1927935fe098SMike Snitzer vfs_fsync(file, 1); 1928935fe098SMike Snitzer } 1929935fe098SMike Snitzer /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ 1930935fe098SMike Snitzer if (!mddev->bitmap_info.external) { 1931935fe098SMike Snitzer /* 1932935fe098SMike Snitzer * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is 1933935fe098SMike Snitzer * instructing us to create a new on-disk bitmap instance. 1934935fe098SMike Snitzer */ 1935935fe098SMike Snitzer if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) 1936e64e4018SAndy Shevchenko err = md_bitmap_new_disk_sb(bitmap); 1937935fe098SMike Snitzer else 1938e64e4018SAndy Shevchenko err = md_bitmap_read_sb(bitmap); 1939935fe098SMike Snitzer } else { 1940935fe098SMike Snitzer err = 0; 1941935fe098SMike Snitzer if (mddev->bitmap_info.chunksize == 0 || 1942935fe098SMike Snitzer mddev->bitmap_info.daemon_sleep == 0) 1943935fe098SMike Snitzer /* chunksize and time_base need to be 1944935fe098SMike Snitzer * set first. */ 1945935fe098SMike Snitzer err = -EINVAL; 1946935fe098SMike Snitzer } 1947935fe098SMike Snitzer if (err) 1948935fe098SMike Snitzer goto error; 1949935fe098SMike Snitzer 1950935fe098SMike Snitzer bitmap->daemon_lastrun = jiffies; 1951e64e4018SAndy Shevchenko err = md_bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1); 1952935fe098SMike Snitzer if (err) 1953935fe098SMike Snitzer goto error; 1954935fe098SMike Snitzer 1955935fe098SMike Snitzer pr_debug("created bitmap (%lu pages) for device %s\n", 1956935fe098SMike Snitzer bitmap->counts.pages, bmname(bitmap)); 1957935fe098SMike Snitzer 1958935fe098SMike Snitzer err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0; 1959935fe098SMike Snitzer if (err) 1960935fe098SMike Snitzer goto error; 1961935fe098SMike Snitzer 1962935fe098SMike Snitzer return bitmap; 1963935fe098SMike Snitzer error: 1964e64e4018SAndy Shevchenko md_bitmap_free(bitmap); 1965935fe098SMike Snitzer return ERR_PTR(err); 1966935fe098SMike Snitzer } 1967935fe098SMike Snitzer 1968e64e4018SAndy Shevchenko int md_bitmap_load(struct mddev *mddev) 1969935fe098SMike Snitzer { 1970935fe098SMike Snitzer int err = 0; 1971935fe098SMike Snitzer sector_t start = 0; 1972935fe098SMike Snitzer sector_t sector = 0; 1973935fe098SMike Snitzer struct bitmap *bitmap = mddev->bitmap; 1974617b194aSGuoqing Jiang struct md_rdev *rdev; 1975935fe098SMike Snitzer 1976935fe098SMike Snitzer if (!bitmap) 1977935fe098SMike Snitzer goto out; 1978935fe098SMike Snitzer 1979617b194aSGuoqing Jiang rdev_for_each(rdev, mddev) 1980404659cfSGuoqing Jiang mddev_create_serial_pool(mddev, rdev, true); 1981617b194aSGuoqing Jiang 1982935fe098SMike Snitzer if (mddev_is_clustered(mddev)) 1983935fe098SMike Snitzer md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes); 1984935fe098SMike Snitzer 1985935fe098SMike Snitzer /* Clear out old bitmap info first: Either there is none, or we 1986935fe098SMike Snitzer * are resuming after someone else has possibly changed things, 1987935fe098SMike Snitzer * so we should forget old cached info. 1988935fe098SMike Snitzer * All chunks should be clean, but some might need_sync. 1989935fe098SMike Snitzer */ 1990935fe098SMike Snitzer while (sector < mddev->resync_max_sectors) { 1991935fe098SMike Snitzer sector_t blocks; 1992e64e4018SAndy Shevchenko md_bitmap_start_sync(bitmap, sector, &blocks, 0); 1993935fe098SMike Snitzer sector += blocks; 1994935fe098SMike Snitzer } 1995e64e4018SAndy Shevchenko md_bitmap_close_sync(bitmap); 1996935fe098SMike Snitzer 1997935fe098SMike Snitzer if (mddev->degraded == 0 1998935fe098SMike Snitzer || bitmap->events_cleared == mddev->events) 1999935fe098SMike Snitzer /* no need to keep dirty bits to optimise a 2000935fe098SMike Snitzer * re-add of a missing device */ 2001935fe098SMike Snitzer start = mddev->recovery_cp; 2002935fe098SMike Snitzer 2003935fe098SMike Snitzer mutex_lock(&mddev->bitmap_info.mutex); 2004e64e4018SAndy Shevchenko err = md_bitmap_init_from_disk(bitmap, start); 2005935fe098SMike Snitzer mutex_unlock(&mddev->bitmap_info.mutex); 2006935fe098SMike Snitzer 2007935fe098SMike Snitzer if (err) 2008935fe098SMike Snitzer goto out; 2009935fe098SMike Snitzer clear_bit(BITMAP_STALE, &bitmap->flags); 2010935fe098SMike Snitzer 2011935fe098SMike Snitzer /* Kick recovery in case any bits were set */ 2012935fe098SMike Snitzer set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); 2013935fe098SMike Snitzer 20144eeb6535SYu Kuai mddev_set_timeout(mddev, mddev->bitmap_info.daemon_sleep, true); 2015935fe098SMike Snitzer md_wakeup_thread(mddev->thread); 2016935fe098SMike Snitzer 2017e64e4018SAndy Shevchenko md_bitmap_update_sb(bitmap); 2018935fe098SMike Snitzer 2019935fe098SMike Snitzer if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) 2020935fe098SMike Snitzer err = -EIO; 2021935fe098SMike Snitzer out: 2022935fe098SMike Snitzer return err; 2023935fe098SMike Snitzer } 2024e64e4018SAndy Shevchenko EXPORT_SYMBOL_GPL(md_bitmap_load); 2025935fe098SMike Snitzer 20261383b347SZhao Heming /* caller need to free returned bitmap with md_bitmap_free() */ 2027935fe098SMike Snitzer struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot) 2028935fe098SMike Snitzer { 2029935fe098SMike Snitzer int rv = 0; 2030935fe098SMike Snitzer struct bitmap *bitmap; 2031935fe098SMike Snitzer 2032e64e4018SAndy Shevchenko bitmap = md_bitmap_create(mddev, slot); 2033935fe098SMike Snitzer if (IS_ERR(bitmap)) { 2034935fe098SMike Snitzer rv = PTR_ERR(bitmap); 2035935fe098SMike Snitzer return ERR_PTR(rv); 2036935fe098SMike Snitzer } 2037935fe098SMike Snitzer 2038e64e4018SAndy Shevchenko rv = md_bitmap_init_from_disk(bitmap, 0); 2039935fe098SMike Snitzer if (rv) { 2040e64e4018SAndy Shevchenko md_bitmap_free(bitmap); 2041935fe098SMike Snitzer return ERR_PTR(rv); 2042935fe098SMike Snitzer } 2043935fe098SMike Snitzer 2044935fe098SMike Snitzer return bitmap; 2045935fe098SMike Snitzer } 2046935fe098SMike Snitzer EXPORT_SYMBOL(get_bitmap_from_slot); 2047935fe098SMike Snitzer 2048935fe098SMike Snitzer /* Loads the bitmap associated with slot and copies the resync information 2049935fe098SMike Snitzer * to our bitmap 2050935fe098SMike Snitzer */ 2051e64e4018SAndy Shevchenko int md_bitmap_copy_from_slot(struct mddev *mddev, int slot, 2052935fe098SMike Snitzer sector_t *low, sector_t *high, bool clear_bits) 2053935fe098SMike Snitzer { 2054935fe098SMike Snitzer int rv = 0, i, j; 2055935fe098SMike Snitzer sector_t block, lo = 0, hi = 0; 2056935fe098SMike Snitzer struct bitmap_counts *counts; 2057935fe098SMike Snitzer struct bitmap *bitmap; 2058935fe098SMike Snitzer 2059935fe098SMike Snitzer bitmap = get_bitmap_from_slot(mddev, slot); 2060935fe098SMike Snitzer if (IS_ERR(bitmap)) { 2061935fe098SMike Snitzer pr_err("%s can't get bitmap from slot %d\n", __func__, slot); 2062935fe098SMike Snitzer return -1; 2063935fe098SMike Snitzer } 2064935fe098SMike Snitzer 2065935fe098SMike Snitzer counts = &bitmap->counts; 2066935fe098SMike Snitzer for (j = 0; j < counts->chunks; j++) { 2067935fe098SMike Snitzer block = (sector_t)j << counts->chunkshift; 2068e64e4018SAndy Shevchenko if (md_bitmap_file_test_bit(bitmap, block)) { 2069935fe098SMike Snitzer if (!lo) 2070935fe098SMike Snitzer lo = block; 2071935fe098SMike Snitzer hi = block; 2072e64e4018SAndy Shevchenko md_bitmap_file_clear_bit(bitmap, block); 2073e64e4018SAndy Shevchenko md_bitmap_set_memory_bits(mddev->bitmap, block, 1); 2074e64e4018SAndy Shevchenko md_bitmap_file_set_bit(mddev->bitmap, block); 2075935fe098SMike Snitzer } 2076935fe098SMike Snitzer } 2077935fe098SMike Snitzer 2078935fe098SMike Snitzer if (clear_bits) { 2079e64e4018SAndy Shevchenko md_bitmap_update_sb(bitmap); 2080935fe098SMike Snitzer /* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs 2081935fe098SMike Snitzer * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */ 2082935fe098SMike Snitzer for (i = 0; i < bitmap->storage.file_pages; i++) 2083935fe098SMike Snitzer if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING)) 2084935fe098SMike Snitzer set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); 2085e64e4018SAndy Shevchenko md_bitmap_unplug(bitmap); 2086935fe098SMike Snitzer } 2087e64e4018SAndy Shevchenko md_bitmap_unplug(mddev->bitmap); 2088935fe098SMike Snitzer *low = lo; 2089935fe098SMike Snitzer *high = hi; 20901383b347SZhao Heming md_bitmap_free(bitmap); 2091935fe098SMike Snitzer 2092935fe098SMike Snitzer return rv; 2093935fe098SMike Snitzer } 2094e64e4018SAndy Shevchenko EXPORT_SYMBOL_GPL(md_bitmap_copy_from_slot); 2095935fe098SMike Snitzer 2096935fe098SMike Snitzer 2097e64e4018SAndy Shevchenko void md_bitmap_status(struct seq_file *seq, struct bitmap *bitmap) 2098935fe098SMike Snitzer { 2099935fe098SMike Snitzer unsigned long chunk_kb; 2100935fe098SMike Snitzer struct bitmap_counts *counts; 2101935fe098SMike Snitzer 2102935fe098SMike Snitzer if (!bitmap) 2103935fe098SMike Snitzer return; 2104935fe098SMike Snitzer 2105935fe098SMike Snitzer counts = &bitmap->counts; 2106935fe098SMike Snitzer 2107935fe098SMike Snitzer chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; 2108935fe098SMike Snitzer seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " 2109935fe098SMike Snitzer "%lu%s chunk", 2110935fe098SMike Snitzer counts->pages - counts->missing_pages, 2111935fe098SMike Snitzer counts->pages, 2112935fe098SMike Snitzer (counts->pages - counts->missing_pages) 2113935fe098SMike Snitzer << (PAGE_SHIFT - 10), 2114935fe098SMike Snitzer chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, 2115935fe098SMike Snitzer chunk_kb ? "KB" : "B"); 2116935fe098SMike Snitzer if (bitmap->storage.file) { 2117935fe098SMike Snitzer seq_printf(seq, ", file: "); 2118935fe098SMike Snitzer seq_file_path(seq, bitmap->storage.file, " \t\n"); 2119935fe098SMike Snitzer } 2120935fe098SMike Snitzer 2121935fe098SMike Snitzer seq_printf(seq, "\n"); 2122935fe098SMike Snitzer } 2123935fe098SMike Snitzer 2124e64e4018SAndy Shevchenko int md_bitmap_resize(struct bitmap *bitmap, sector_t blocks, 2125935fe098SMike Snitzer int chunksize, int init) 2126935fe098SMike Snitzer { 2127935fe098SMike Snitzer /* If chunk_size is 0, choose an appropriate chunk size. 2128935fe098SMike Snitzer * Then possibly allocate new storage space. 2129935fe098SMike Snitzer * Then quiesce, copy bits, replace bitmap, and re-start 2130935fe098SMike Snitzer * 2131935fe098SMike Snitzer * This function is called both to set up the initial bitmap 2132935fe098SMike Snitzer * and to resize the bitmap while the array is active. 2133935fe098SMike Snitzer * If this happens as a result of the array being resized, 2134935fe098SMike Snitzer * chunksize will be zero, and we need to choose a suitable 2135935fe098SMike Snitzer * chunksize, otherwise we use what we are given. 2136935fe098SMike Snitzer */ 2137935fe098SMike Snitzer struct bitmap_storage store; 2138935fe098SMike Snitzer struct bitmap_counts old_counts; 2139935fe098SMike Snitzer unsigned long chunks; 2140935fe098SMike Snitzer sector_t block; 2141935fe098SMike Snitzer sector_t old_blocks, new_blocks; 2142935fe098SMike Snitzer int chunkshift; 2143935fe098SMike Snitzer int ret = 0; 2144935fe098SMike Snitzer long pages; 2145935fe098SMike Snitzer struct bitmap_page *new_bp; 2146935fe098SMike Snitzer 2147935fe098SMike Snitzer if (bitmap->storage.file && !init) { 2148935fe098SMike Snitzer pr_info("md: cannot resize file-based bitmap\n"); 2149935fe098SMike Snitzer return -EINVAL; 2150935fe098SMike Snitzer } 2151935fe098SMike Snitzer 2152935fe098SMike Snitzer if (chunksize == 0) { 2153935fe098SMike Snitzer /* If there is enough space, leave the chunk size unchanged, 2154935fe098SMike Snitzer * else increase by factor of two until there is enough space. 2155935fe098SMike Snitzer */ 2156935fe098SMike Snitzer long bytes; 2157935fe098SMike Snitzer long space = bitmap->mddev->bitmap_info.space; 2158935fe098SMike Snitzer 2159935fe098SMike Snitzer if (space == 0) { 2160935fe098SMike Snitzer /* We don't know how much space there is, so limit 2161935fe098SMike Snitzer * to current size - in sectors. 2162935fe098SMike Snitzer */ 2163935fe098SMike Snitzer bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8); 2164935fe098SMike Snitzer if (!bitmap->mddev->bitmap_info.external) 2165935fe098SMike Snitzer bytes += sizeof(bitmap_super_t); 2166935fe098SMike Snitzer space = DIV_ROUND_UP(bytes, 512); 2167935fe098SMike Snitzer bitmap->mddev->bitmap_info.space = space; 2168935fe098SMike Snitzer } 2169935fe098SMike Snitzer chunkshift = bitmap->counts.chunkshift; 2170935fe098SMike Snitzer chunkshift--; 2171935fe098SMike Snitzer do { 2172935fe098SMike Snitzer /* 'chunkshift' is shift from block size to chunk size */ 2173935fe098SMike Snitzer chunkshift++; 2174935fe098SMike Snitzer chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); 2175935fe098SMike Snitzer bytes = DIV_ROUND_UP(chunks, 8); 2176935fe098SMike Snitzer if (!bitmap->mddev->bitmap_info.external) 2177935fe098SMike Snitzer bytes += sizeof(bitmap_super_t); 217845552111SFlorian-Ewald Mueller } while (bytes > (space << 9) && (chunkshift + BITMAP_BLOCK_SHIFT) < 217945552111SFlorian-Ewald Mueller (BITS_PER_BYTE * sizeof(((bitmap_super_t *)0)->chunksize) - 1)); 2180935fe098SMike Snitzer } else 2181935fe098SMike Snitzer chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT; 2182935fe098SMike Snitzer 2183935fe098SMike Snitzer chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); 2184935fe098SMike Snitzer memset(&store, 0, sizeof(store)); 2185935fe098SMike Snitzer if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file) 2186e64e4018SAndy Shevchenko ret = md_bitmap_storage_alloc(&store, chunks, 2187935fe098SMike Snitzer !bitmap->mddev->bitmap_info.external, 2188935fe098SMike Snitzer mddev_is_clustered(bitmap->mddev) 2189935fe098SMike Snitzer ? bitmap->cluster_slot : 0); 2190935fe098SMike Snitzer if (ret) { 2191e64e4018SAndy Shevchenko md_bitmap_file_unmap(&store); 2192935fe098SMike Snitzer goto err; 2193935fe098SMike Snitzer } 2194935fe098SMike Snitzer 2195935fe098SMike Snitzer pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO); 2196935fe098SMike Snitzer 21976396bb22SKees Cook new_bp = kcalloc(pages, sizeof(*new_bp), GFP_KERNEL); 2198935fe098SMike Snitzer ret = -ENOMEM; 2199935fe098SMike Snitzer if (!new_bp) { 2200e64e4018SAndy Shevchenko md_bitmap_file_unmap(&store); 2201935fe098SMike Snitzer goto err; 2202935fe098SMike Snitzer } 2203935fe098SMike Snitzer 2204935fe098SMike Snitzer if (!init) 2205935fe098SMike Snitzer bitmap->mddev->pers->quiesce(bitmap->mddev, 1); 2206935fe098SMike Snitzer 2207935fe098SMike Snitzer store.file = bitmap->storage.file; 2208935fe098SMike Snitzer bitmap->storage.file = NULL; 2209935fe098SMike Snitzer 2210935fe098SMike Snitzer if (store.sb_page && bitmap->storage.sb_page) 2211935fe098SMike Snitzer memcpy(page_address(store.sb_page), 2212935fe098SMike Snitzer page_address(bitmap->storage.sb_page), 2213935fe098SMike Snitzer sizeof(bitmap_super_t)); 2214fadcbd29SGuoqing Jiang spin_lock_irq(&bitmap->counts.lock); 2215e64e4018SAndy Shevchenko md_bitmap_file_unmap(&bitmap->storage); 2216935fe098SMike Snitzer bitmap->storage = store; 2217935fe098SMike Snitzer 2218935fe098SMike Snitzer old_counts = bitmap->counts; 2219935fe098SMike Snitzer bitmap->counts.bp = new_bp; 2220935fe098SMike Snitzer bitmap->counts.pages = pages; 2221935fe098SMike Snitzer bitmap->counts.missing_pages = pages; 2222935fe098SMike Snitzer bitmap->counts.chunkshift = chunkshift; 2223935fe098SMike Snitzer bitmap->counts.chunks = chunks; 222445552111SFlorian-Ewald Mueller bitmap->mddev->bitmap_info.chunksize = 1UL << (chunkshift + 2225935fe098SMike Snitzer BITMAP_BLOCK_SHIFT); 2226935fe098SMike Snitzer 2227935fe098SMike Snitzer blocks = min(old_counts.chunks << old_counts.chunkshift, 2228935fe098SMike Snitzer chunks << chunkshift); 2229935fe098SMike Snitzer 2230935fe098SMike Snitzer /* For cluster raid, need to pre-allocate bitmap */ 2231935fe098SMike Snitzer if (mddev_is_clustered(bitmap->mddev)) { 2232935fe098SMike Snitzer unsigned long page; 2233935fe098SMike Snitzer for (page = 0; page < pages; page++) { 2234e64e4018SAndy Shevchenko ret = md_bitmap_checkpage(&bitmap->counts, page, 1, 1); 2235935fe098SMike Snitzer if (ret) { 2236935fe098SMike Snitzer unsigned long k; 2237935fe098SMike Snitzer 2238935fe098SMike Snitzer /* deallocate the page memory */ 2239935fe098SMike Snitzer for (k = 0; k < page; k++) { 2240935fe098SMike Snitzer kfree(new_bp[k].map); 2241935fe098SMike Snitzer } 22420868b99cSZdenek Kabelac kfree(new_bp); 2243935fe098SMike Snitzer 2244935fe098SMike Snitzer /* restore some fields from old_counts */ 2245935fe098SMike Snitzer bitmap->counts.bp = old_counts.bp; 2246935fe098SMike Snitzer bitmap->counts.pages = old_counts.pages; 2247935fe098SMike Snitzer bitmap->counts.missing_pages = old_counts.pages; 2248935fe098SMike Snitzer bitmap->counts.chunkshift = old_counts.chunkshift; 2249935fe098SMike Snitzer bitmap->counts.chunks = old_counts.chunks; 225045552111SFlorian-Ewald Mueller bitmap->mddev->bitmap_info.chunksize = 225145552111SFlorian-Ewald Mueller 1UL << (old_counts.chunkshift + BITMAP_BLOCK_SHIFT); 2252935fe098SMike Snitzer blocks = old_counts.chunks << old_counts.chunkshift; 2253935fe098SMike Snitzer pr_warn("Could not pre-allocate in-memory bitmap for cluster raid\n"); 2254935fe098SMike Snitzer break; 2255935fe098SMike Snitzer } else 2256935fe098SMike Snitzer bitmap->counts.bp[page].count += 1; 2257935fe098SMike Snitzer } 2258935fe098SMike Snitzer } 2259935fe098SMike Snitzer 2260935fe098SMike Snitzer for (block = 0; block < blocks; ) { 2261935fe098SMike Snitzer bitmap_counter_t *bmc_old, *bmc_new; 2262935fe098SMike Snitzer int set; 2263935fe098SMike Snitzer 2264e64e4018SAndy Shevchenko bmc_old = md_bitmap_get_counter(&old_counts, block, &old_blocks, 0); 2265935fe098SMike Snitzer set = bmc_old && NEEDED(*bmc_old); 2266935fe098SMike Snitzer 2267935fe098SMike Snitzer if (set) { 2268e64e4018SAndy Shevchenko bmc_new = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1); 22693bd548e5SLi Zhong if (bmc_new) { 2270935fe098SMike Snitzer if (*bmc_new == 0) { 2271935fe098SMike Snitzer /* need to set on-disk bits too. */ 2272935fe098SMike Snitzer sector_t end = block + new_blocks; 2273935fe098SMike Snitzer sector_t start = block >> chunkshift; 22743bd548e5SLi Zhong 2275935fe098SMike Snitzer start <<= chunkshift; 2276935fe098SMike Snitzer while (start < end) { 2277e64e4018SAndy Shevchenko md_bitmap_file_set_bit(bitmap, block); 2278935fe098SMike Snitzer start += 1 << chunkshift; 2279935fe098SMike Snitzer } 2280935fe098SMike Snitzer *bmc_new = 2; 2281e64e4018SAndy Shevchenko md_bitmap_count_page(&bitmap->counts, block, 1); 2282e64e4018SAndy Shevchenko md_bitmap_set_pending(&bitmap->counts, block); 2283935fe098SMike Snitzer } 2284935fe098SMike Snitzer *bmc_new |= NEEDED_MASK; 22853bd548e5SLi Zhong } 2286935fe098SMike Snitzer if (new_blocks < old_blocks) 2287935fe098SMike Snitzer old_blocks = new_blocks; 2288935fe098SMike Snitzer } 2289935fe098SMike Snitzer block += old_blocks; 2290935fe098SMike Snitzer } 2291935fe098SMike Snitzer 22920868b99cSZdenek Kabelac if (bitmap->counts.bp != old_counts.bp) { 22930868b99cSZdenek Kabelac unsigned long k; 22940868b99cSZdenek Kabelac for (k = 0; k < old_counts.pages; k++) 22950868b99cSZdenek Kabelac if (!old_counts.bp[k].hijacked) 22960868b99cSZdenek Kabelac kfree(old_counts.bp[k].map); 22970868b99cSZdenek Kabelac kfree(old_counts.bp); 22980868b99cSZdenek Kabelac } 22990868b99cSZdenek Kabelac 2300935fe098SMike Snitzer if (!init) { 2301935fe098SMike Snitzer int i; 2302935fe098SMike Snitzer while (block < (chunks << chunkshift)) { 2303935fe098SMike Snitzer bitmap_counter_t *bmc; 2304e64e4018SAndy Shevchenko bmc = md_bitmap_get_counter(&bitmap->counts, block, &new_blocks, 1); 2305935fe098SMike Snitzer if (bmc) { 2306935fe098SMike Snitzer /* new space. It needs to be resynced, so 2307935fe098SMike Snitzer * we set NEEDED_MASK. 2308935fe098SMike Snitzer */ 2309935fe098SMike Snitzer if (*bmc == 0) { 2310935fe098SMike Snitzer *bmc = NEEDED_MASK | 2; 2311e64e4018SAndy Shevchenko md_bitmap_count_page(&bitmap->counts, block, 1); 2312e64e4018SAndy Shevchenko md_bitmap_set_pending(&bitmap->counts, block); 2313935fe098SMike Snitzer } 2314935fe098SMike Snitzer } 2315935fe098SMike Snitzer block += new_blocks; 2316935fe098SMike Snitzer } 2317935fe098SMike Snitzer for (i = 0; i < bitmap->storage.file_pages; i++) 2318935fe098SMike Snitzer set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); 2319935fe098SMike Snitzer } 2320935fe098SMike Snitzer spin_unlock_irq(&bitmap->counts.lock); 2321935fe098SMike Snitzer 2322935fe098SMike Snitzer if (!init) { 2323e64e4018SAndy Shevchenko md_bitmap_unplug(bitmap); 2324935fe098SMike Snitzer bitmap->mddev->pers->quiesce(bitmap->mddev, 0); 2325935fe098SMike Snitzer } 2326935fe098SMike Snitzer ret = 0; 2327935fe098SMike Snitzer err: 2328935fe098SMike Snitzer return ret; 2329935fe098SMike Snitzer } 2330e64e4018SAndy Shevchenko EXPORT_SYMBOL_GPL(md_bitmap_resize); 2331935fe098SMike Snitzer 2332935fe098SMike Snitzer static ssize_t 2333935fe098SMike Snitzer location_show(struct mddev *mddev, char *page) 2334935fe098SMike Snitzer { 2335935fe098SMike Snitzer ssize_t len; 2336935fe098SMike Snitzer if (mddev->bitmap_info.file) 2337935fe098SMike Snitzer len = sprintf(page, "file"); 2338935fe098SMike Snitzer else if (mddev->bitmap_info.offset) 2339935fe098SMike Snitzer len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); 2340935fe098SMike Snitzer else 2341935fe098SMike Snitzer len = sprintf(page, "none"); 2342935fe098SMike Snitzer len += sprintf(page+len, "\n"); 2343935fe098SMike Snitzer return len; 2344935fe098SMike Snitzer } 2345935fe098SMike Snitzer 2346935fe098SMike Snitzer static ssize_t 2347935fe098SMike Snitzer location_store(struct mddev *mddev, const char *buf, size_t len) 2348935fe098SMike Snitzer { 2349935fe098SMike Snitzer int rv; 2350935fe098SMike Snitzer 2351935fe098SMike Snitzer rv = mddev_lock(mddev); 2352935fe098SMike Snitzer if (rv) 2353935fe098SMike Snitzer return rv; 2354935fe098SMike Snitzer if (mddev->pers) { 2355935fe098SMike Snitzer if (!mddev->pers->quiesce) { 2356935fe098SMike Snitzer rv = -EBUSY; 2357935fe098SMike Snitzer goto out; 2358935fe098SMike Snitzer } 2359935fe098SMike Snitzer if (mddev->recovery || mddev->sync_thread) { 2360935fe098SMike Snitzer rv = -EBUSY; 2361935fe098SMike Snitzer goto out; 2362935fe098SMike Snitzer } 2363935fe098SMike Snitzer } 2364935fe098SMike Snitzer 2365935fe098SMike Snitzer if (mddev->bitmap || mddev->bitmap_info.file || 2366935fe098SMike Snitzer mddev->bitmap_info.offset) { 2367935fe098SMike Snitzer /* bitmap already configured. Only option is to clear it */ 2368935fe098SMike Snitzer if (strncmp(buf, "none", 4) != 0) { 2369935fe098SMike Snitzer rv = -EBUSY; 2370935fe098SMike Snitzer goto out; 2371935fe098SMike Snitzer } 2372935fe098SMike Snitzer if (mddev->pers) { 2373f8f83d8fSJack Wang mddev_suspend(mddev); 2374e64e4018SAndy Shevchenko md_bitmap_destroy(mddev); 2375f8f83d8fSJack Wang mddev_resume(mddev); 2376935fe098SMike Snitzer } 2377935fe098SMike Snitzer mddev->bitmap_info.offset = 0; 2378935fe098SMike Snitzer if (mddev->bitmap_info.file) { 2379935fe098SMike Snitzer struct file *f = mddev->bitmap_info.file; 2380935fe098SMike Snitzer mddev->bitmap_info.file = NULL; 2381935fe098SMike Snitzer fput(f); 2382935fe098SMike Snitzer } 2383935fe098SMike Snitzer } else { 2384935fe098SMike Snitzer /* No bitmap, OK to set a location */ 2385935fe098SMike Snitzer long long offset; 2386935fe098SMike Snitzer if (strncmp(buf, "none", 4) == 0) 2387935fe098SMike Snitzer /* nothing to be done */; 2388935fe098SMike Snitzer else if (strncmp(buf, "file:", 5) == 0) { 2389935fe098SMike Snitzer /* Not supported yet */ 2390935fe098SMike Snitzer rv = -EINVAL; 2391935fe098SMike Snitzer goto out; 2392935fe098SMike Snitzer } else { 2393935fe098SMike Snitzer if (buf[0] == '+') 2394935fe098SMike Snitzer rv = kstrtoll(buf+1, 10, &offset); 2395935fe098SMike Snitzer else 2396935fe098SMike Snitzer rv = kstrtoll(buf, 10, &offset); 2397935fe098SMike Snitzer if (rv) 2398935fe098SMike Snitzer goto out; 2399935fe098SMike Snitzer if (offset == 0) { 2400935fe098SMike Snitzer rv = -EINVAL; 2401935fe098SMike Snitzer goto out; 2402935fe098SMike Snitzer } 2403935fe098SMike Snitzer if (mddev->bitmap_info.external == 0 && 2404935fe098SMike Snitzer mddev->major_version == 0 && 2405935fe098SMike Snitzer offset != mddev->bitmap_info.default_offset) { 2406935fe098SMike Snitzer rv = -EINVAL; 2407935fe098SMike Snitzer goto out; 2408935fe098SMike Snitzer } 2409935fe098SMike Snitzer mddev->bitmap_info.offset = offset; 2410935fe098SMike Snitzer if (mddev->pers) { 2411935fe098SMike Snitzer struct bitmap *bitmap; 2412e64e4018SAndy Shevchenko bitmap = md_bitmap_create(mddev, -1); 2413f8f83d8fSJack Wang mddev_suspend(mddev); 2414935fe098SMike Snitzer if (IS_ERR(bitmap)) 2415935fe098SMike Snitzer rv = PTR_ERR(bitmap); 2416935fe098SMike Snitzer else { 2417935fe098SMike Snitzer mddev->bitmap = bitmap; 2418e64e4018SAndy Shevchenko rv = md_bitmap_load(mddev); 2419935fe098SMike Snitzer if (rv) 2420935fe098SMike Snitzer mddev->bitmap_info.offset = 0; 2421935fe098SMike Snitzer } 2422935fe098SMike Snitzer if (rv) { 2423e64e4018SAndy Shevchenko md_bitmap_destroy(mddev); 2424f8f83d8fSJack Wang mddev_resume(mddev); 2425935fe098SMike Snitzer goto out; 2426935fe098SMike Snitzer } 2427f8f83d8fSJack Wang mddev_resume(mddev); 2428935fe098SMike Snitzer } 2429935fe098SMike Snitzer } 2430935fe098SMike Snitzer } 2431935fe098SMike Snitzer if (!mddev->external) { 2432935fe098SMike Snitzer /* Ensure new bitmap info is stored in 2433935fe098SMike Snitzer * metadata promptly. 2434935fe098SMike Snitzer */ 2435935fe098SMike Snitzer set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); 2436935fe098SMike Snitzer md_wakeup_thread(mddev->thread); 2437935fe098SMike Snitzer } 2438935fe098SMike Snitzer rv = 0; 2439935fe098SMike Snitzer out: 2440935fe098SMike Snitzer mddev_unlock(mddev); 2441935fe098SMike Snitzer if (rv) 2442935fe098SMike Snitzer return rv; 2443935fe098SMike Snitzer return len; 2444935fe098SMike Snitzer } 2445935fe098SMike Snitzer 2446935fe098SMike Snitzer static struct md_sysfs_entry bitmap_location = 2447935fe098SMike Snitzer __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); 2448935fe098SMike Snitzer 2449935fe098SMike Snitzer /* 'bitmap/space' is the space available at 'location' for the 2450935fe098SMike Snitzer * bitmap. This allows the kernel to know when it is safe to 2451935fe098SMike Snitzer * resize the bitmap to match a resized array. 2452935fe098SMike Snitzer */ 2453935fe098SMike Snitzer static ssize_t 2454935fe098SMike Snitzer space_show(struct mddev *mddev, char *page) 2455935fe098SMike Snitzer { 2456935fe098SMike Snitzer return sprintf(page, "%lu\n", mddev->bitmap_info.space); 2457935fe098SMike Snitzer } 2458935fe098SMike Snitzer 2459935fe098SMike Snitzer static ssize_t 2460935fe098SMike Snitzer space_store(struct mddev *mddev, const char *buf, size_t len) 2461935fe098SMike Snitzer { 2462935fe098SMike Snitzer unsigned long sectors; 2463935fe098SMike Snitzer int rv; 2464935fe098SMike Snitzer 2465935fe098SMike Snitzer rv = kstrtoul(buf, 10, §ors); 2466935fe098SMike Snitzer if (rv) 2467935fe098SMike Snitzer return rv; 2468935fe098SMike Snitzer 2469935fe098SMike Snitzer if (sectors == 0) 2470935fe098SMike Snitzer return -EINVAL; 2471935fe098SMike Snitzer 2472935fe098SMike Snitzer if (mddev->bitmap && 2473935fe098SMike Snitzer sectors < (mddev->bitmap->storage.bytes + 511) >> 9) 2474935fe098SMike Snitzer return -EFBIG; /* Bitmap is too big for this small space */ 2475935fe098SMike Snitzer 2476935fe098SMike Snitzer /* could make sure it isn't too big, but that isn't really 2477935fe098SMike Snitzer * needed - user-space should be careful. 2478935fe098SMike Snitzer */ 2479935fe098SMike Snitzer mddev->bitmap_info.space = sectors; 2480935fe098SMike Snitzer return len; 2481935fe098SMike Snitzer } 2482935fe098SMike Snitzer 2483935fe098SMike Snitzer static struct md_sysfs_entry bitmap_space = 2484935fe098SMike Snitzer __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); 2485935fe098SMike Snitzer 2486935fe098SMike Snitzer static ssize_t 2487935fe098SMike Snitzer timeout_show(struct mddev *mddev, char *page) 2488935fe098SMike Snitzer { 2489935fe098SMike Snitzer ssize_t len; 2490935fe098SMike Snitzer unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; 2491935fe098SMike Snitzer unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; 2492935fe098SMike Snitzer 2493935fe098SMike Snitzer len = sprintf(page, "%lu", secs); 2494935fe098SMike Snitzer if (jifs) 2495935fe098SMike Snitzer len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); 2496935fe098SMike Snitzer len += sprintf(page+len, "\n"); 2497935fe098SMike Snitzer return len; 2498935fe098SMike Snitzer } 2499935fe098SMike Snitzer 2500935fe098SMike Snitzer static ssize_t 2501935fe098SMike Snitzer timeout_store(struct mddev *mddev, const char *buf, size_t len) 2502935fe098SMike Snitzer { 2503935fe098SMike Snitzer /* timeout can be set at any time */ 2504935fe098SMike Snitzer unsigned long timeout; 2505935fe098SMike Snitzer int rv = strict_strtoul_scaled(buf, &timeout, 4); 2506935fe098SMike Snitzer if (rv) 2507935fe098SMike Snitzer return rv; 2508935fe098SMike Snitzer 2509935fe098SMike Snitzer /* just to make sure we don't overflow... */ 2510935fe098SMike Snitzer if (timeout >= LONG_MAX / HZ) 2511935fe098SMike Snitzer return -EINVAL; 2512935fe098SMike Snitzer 2513935fe098SMike Snitzer timeout = timeout * HZ / 10000; 2514935fe098SMike Snitzer 2515935fe098SMike Snitzer if (timeout >= MAX_SCHEDULE_TIMEOUT) 2516935fe098SMike Snitzer timeout = MAX_SCHEDULE_TIMEOUT-1; 2517935fe098SMike Snitzer if (timeout < 1) 2518935fe098SMike Snitzer timeout = 1; 2519c333673aSYu Kuai 25204eeb6535SYu Kuai mddev->bitmap_info.daemon_sleep = timeout; 25214eeb6535SYu Kuai mddev_set_timeout(mddev, timeout, false); 2522935fe098SMike Snitzer md_wakeup_thread(mddev->thread); 25234eeb6535SYu Kuai 2524935fe098SMike Snitzer return len; 2525935fe098SMike Snitzer } 2526935fe098SMike Snitzer 2527935fe098SMike Snitzer static struct md_sysfs_entry bitmap_timeout = 2528935fe098SMike Snitzer __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); 2529935fe098SMike Snitzer 2530935fe098SMike Snitzer static ssize_t 2531935fe098SMike Snitzer backlog_show(struct mddev *mddev, char *page) 2532935fe098SMike Snitzer { 2533935fe098SMike Snitzer return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); 2534935fe098SMike Snitzer } 2535935fe098SMike Snitzer 2536935fe098SMike Snitzer static ssize_t 2537935fe098SMike Snitzer backlog_store(struct mddev *mddev, const char *buf, size_t len) 2538935fe098SMike Snitzer { 2539935fe098SMike Snitzer unsigned long backlog; 254010c92fcaSGuoqing Jiang unsigned long old_mwb = mddev->bitmap_info.max_write_behind; 25418c13ab11SGuoqing Jiang struct md_rdev *rdev; 25428c13ab11SGuoqing Jiang bool has_write_mostly = false; 2543935fe098SMike Snitzer int rv = kstrtoul(buf, 10, &backlog); 2544935fe098SMike Snitzer if (rv) 2545935fe098SMike Snitzer return rv; 2546935fe098SMike Snitzer if (backlog > COUNTER_MAX) 2547935fe098SMike Snitzer return -EINVAL; 25488c13ab11SGuoqing Jiang 2549*44abfa6aSYu Kuai rv = mddev_lock(mddev); 2550*44abfa6aSYu Kuai if (rv) 2551*44abfa6aSYu Kuai return rv; 2552*44abfa6aSYu Kuai 25538c13ab11SGuoqing Jiang /* 25548c13ab11SGuoqing Jiang * Without write mostly device, it doesn't make sense to set 25558c13ab11SGuoqing Jiang * backlog for max_write_behind. 25568c13ab11SGuoqing Jiang */ 25578c13ab11SGuoqing Jiang rdev_for_each(rdev, mddev) { 25588c13ab11SGuoqing Jiang if (test_bit(WriteMostly, &rdev->flags)) { 25598c13ab11SGuoqing Jiang has_write_mostly = true; 25608c13ab11SGuoqing Jiang break; 25618c13ab11SGuoqing Jiang } 25628c13ab11SGuoqing Jiang } 25638c13ab11SGuoqing Jiang if (!has_write_mostly) { 25648c13ab11SGuoqing Jiang pr_warn_ratelimited("%s: can't set backlog, no write mostly device available\n", 25658c13ab11SGuoqing Jiang mdname(mddev)); 2566*44abfa6aSYu Kuai mddev_unlock(mddev); 25678c13ab11SGuoqing Jiang return -EINVAL; 25688c13ab11SGuoqing Jiang } 25698c13ab11SGuoqing Jiang 2570935fe098SMike Snitzer mddev->bitmap_info.max_write_behind = backlog; 2571404659cfSGuoqing Jiang if (!backlog && mddev->serial_info_pool) { 2572404659cfSGuoqing Jiang /* serial_info_pool is not needed if backlog is zero */ 257369b00b5bSGuoqing Jiang if (!mddev->serialize_policy) 257469b00b5bSGuoqing Jiang mddev_destroy_serial_pool(mddev, NULL, false); 2575404659cfSGuoqing Jiang } else if (backlog && !mddev->serial_info_pool) { 2576404659cfSGuoqing Jiang /* serial_info_pool is needed since backlog is not zero */ 257710c92fcaSGuoqing Jiang rdev_for_each(rdev, mddev) 2578404659cfSGuoqing Jiang mddev_create_serial_pool(mddev, rdev, false); 257910c92fcaSGuoqing Jiang } 258010c92fcaSGuoqing Jiang if (old_mwb != backlog) 258110c92fcaSGuoqing Jiang md_bitmap_update_sb(mddev->bitmap); 2582*44abfa6aSYu Kuai 2583*44abfa6aSYu Kuai mddev_unlock(mddev); 2584935fe098SMike Snitzer return len; 2585935fe098SMike Snitzer } 2586935fe098SMike Snitzer 2587935fe098SMike Snitzer static struct md_sysfs_entry bitmap_backlog = 2588935fe098SMike Snitzer __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); 2589935fe098SMike Snitzer 2590935fe098SMike Snitzer static ssize_t 2591935fe098SMike Snitzer chunksize_show(struct mddev *mddev, char *page) 2592935fe098SMike Snitzer { 2593935fe098SMike Snitzer return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); 2594935fe098SMike Snitzer } 2595935fe098SMike Snitzer 2596935fe098SMike Snitzer static ssize_t 2597935fe098SMike Snitzer chunksize_store(struct mddev *mddev, const char *buf, size_t len) 2598935fe098SMike Snitzer { 2599935fe098SMike Snitzer /* Can only be changed when no bitmap is active */ 2600935fe098SMike Snitzer int rv; 2601935fe098SMike Snitzer unsigned long csize; 2602935fe098SMike Snitzer if (mddev->bitmap) 2603935fe098SMike Snitzer return -EBUSY; 2604935fe098SMike Snitzer rv = kstrtoul(buf, 10, &csize); 2605935fe098SMike Snitzer if (rv) 2606935fe098SMike Snitzer return rv; 2607935fe098SMike Snitzer if (csize < 512 || 2608935fe098SMike Snitzer !is_power_of_2(csize)) 2609935fe098SMike Snitzer return -EINVAL; 261045552111SFlorian-Ewald Mueller if (BITS_PER_LONG > 32 && csize >= (1ULL << (BITS_PER_BYTE * 261145552111SFlorian-Ewald Mueller sizeof(((bitmap_super_t *)0)->chunksize)))) 261245552111SFlorian-Ewald Mueller return -EOVERFLOW; 2613935fe098SMike Snitzer mddev->bitmap_info.chunksize = csize; 2614935fe098SMike Snitzer return len; 2615935fe098SMike Snitzer } 2616935fe098SMike Snitzer 2617935fe098SMike Snitzer static struct md_sysfs_entry bitmap_chunksize = 2618935fe098SMike Snitzer __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); 2619935fe098SMike Snitzer 2620935fe098SMike Snitzer static ssize_t metadata_show(struct mddev *mddev, char *page) 2621935fe098SMike Snitzer { 2622935fe098SMike Snitzer if (mddev_is_clustered(mddev)) 2623935fe098SMike Snitzer return sprintf(page, "clustered\n"); 2624935fe098SMike Snitzer return sprintf(page, "%s\n", (mddev->bitmap_info.external 2625935fe098SMike Snitzer ? "external" : "internal")); 2626935fe098SMike Snitzer } 2627935fe098SMike Snitzer 2628935fe098SMike Snitzer static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) 2629935fe098SMike Snitzer { 2630935fe098SMike Snitzer if (mddev->bitmap || 2631935fe098SMike Snitzer mddev->bitmap_info.file || 2632935fe098SMike Snitzer mddev->bitmap_info.offset) 2633935fe098SMike Snitzer return -EBUSY; 2634935fe098SMike Snitzer if (strncmp(buf, "external", 8) == 0) 2635935fe098SMike Snitzer mddev->bitmap_info.external = 1; 2636935fe098SMike Snitzer else if ((strncmp(buf, "internal", 8) == 0) || 2637935fe098SMike Snitzer (strncmp(buf, "clustered", 9) == 0)) 2638935fe098SMike Snitzer mddev->bitmap_info.external = 0; 2639935fe098SMike Snitzer else 2640935fe098SMike Snitzer return -EINVAL; 2641935fe098SMike Snitzer return len; 2642935fe098SMike Snitzer } 2643935fe098SMike Snitzer 2644935fe098SMike Snitzer static struct md_sysfs_entry bitmap_metadata = 2645935fe098SMike Snitzer __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); 2646935fe098SMike Snitzer 2647935fe098SMike Snitzer static ssize_t can_clear_show(struct mddev *mddev, char *page) 2648935fe098SMike Snitzer { 2649935fe098SMike Snitzer int len; 2650935fe098SMike Snitzer spin_lock(&mddev->lock); 2651935fe098SMike Snitzer if (mddev->bitmap) 2652935fe098SMike Snitzer len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? 2653935fe098SMike Snitzer "false" : "true")); 2654935fe098SMike Snitzer else 2655935fe098SMike Snitzer len = sprintf(page, "\n"); 2656935fe098SMike Snitzer spin_unlock(&mddev->lock); 2657935fe098SMike Snitzer return len; 2658935fe098SMike Snitzer } 2659935fe098SMike Snitzer 2660935fe098SMike Snitzer static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) 2661935fe098SMike Snitzer { 2662935fe098SMike Snitzer if (mddev->bitmap == NULL) 2663935fe098SMike Snitzer return -ENOENT; 2664935fe098SMike Snitzer if (strncmp(buf, "false", 5) == 0) 2665935fe098SMike Snitzer mddev->bitmap->need_sync = 1; 2666935fe098SMike Snitzer else if (strncmp(buf, "true", 4) == 0) { 2667935fe098SMike Snitzer if (mddev->degraded) 2668935fe098SMike Snitzer return -EBUSY; 2669935fe098SMike Snitzer mddev->bitmap->need_sync = 0; 2670935fe098SMike Snitzer } else 2671935fe098SMike Snitzer return -EINVAL; 2672935fe098SMike Snitzer return len; 2673935fe098SMike Snitzer } 2674935fe098SMike Snitzer 2675935fe098SMike Snitzer static struct md_sysfs_entry bitmap_can_clear = 2676935fe098SMike Snitzer __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); 2677935fe098SMike Snitzer 2678935fe098SMike Snitzer static ssize_t 2679935fe098SMike Snitzer behind_writes_used_show(struct mddev *mddev, char *page) 2680935fe098SMike Snitzer { 2681935fe098SMike Snitzer ssize_t ret; 2682935fe098SMike Snitzer spin_lock(&mddev->lock); 2683935fe098SMike Snitzer if (mddev->bitmap == NULL) 2684935fe098SMike Snitzer ret = sprintf(page, "0\n"); 2685935fe098SMike Snitzer else 2686935fe098SMike Snitzer ret = sprintf(page, "%lu\n", 2687935fe098SMike Snitzer mddev->bitmap->behind_writes_used); 2688935fe098SMike Snitzer spin_unlock(&mddev->lock); 2689935fe098SMike Snitzer return ret; 2690935fe098SMike Snitzer } 2691935fe098SMike Snitzer 2692935fe098SMike Snitzer static ssize_t 2693935fe098SMike Snitzer behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) 2694935fe098SMike Snitzer { 2695935fe098SMike Snitzer if (mddev->bitmap) 2696935fe098SMike Snitzer mddev->bitmap->behind_writes_used = 0; 2697935fe098SMike Snitzer return len; 2698935fe098SMike Snitzer } 2699935fe098SMike Snitzer 2700935fe098SMike Snitzer static struct md_sysfs_entry max_backlog_used = 2701935fe098SMike Snitzer __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, 2702935fe098SMike Snitzer behind_writes_used_show, behind_writes_used_reset); 2703935fe098SMike Snitzer 2704935fe098SMike Snitzer static struct attribute *md_bitmap_attrs[] = { 2705935fe098SMike Snitzer &bitmap_location.attr, 2706935fe098SMike Snitzer &bitmap_space.attr, 2707935fe098SMike Snitzer &bitmap_timeout.attr, 2708935fe098SMike Snitzer &bitmap_backlog.attr, 2709935fe098SMike Snitzer &bitmap_chunksize.attr, 2710935fe098SMike Snitzer &bitmap_metadata.attr, 2711935fe098SMike Snitzer &bitmap_can_clear.attr, 2712935fe098SMike Snitzer &max_backlog_used.attr, 2713935fe098SMike Snitzer NULL 2714935fe098SMike Snitzer }; 2715c32dc040SRikard Falkeborn const struct attribute_group md_bitmap_group = { 2716935fe098SMike Snitzer .name = "bitmap", 2717935fe098SMike Snitzer .attrs = md_bitmap_attrs, 2718935fe098SMike Snitzer }; 2719