From: Linus Torvalds Date: Wed, 15 Nov 2017 00:07:26 +0000 (-0800) Subject: Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md X-Git-Tag: microblaze-4.16-rc1~372 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=47f521ba18190e4bfbb65ead3977af5756884427;p=linux-2.6-microblaze.git Merge branch 'for-next' of git://git./linux/kernel/git/shli/md Pull MD update from Shaohua Li: "This update mostly includes bug fixes: - md-cluster now supports raid10 from Guoqing - raid5 PPL fixes from Artur - badblock regression fix from Bo - suspend hang related fixes from Neil - raid5 reshape fixes from Neil - raid1 freeze deadlock fix from Nate - memleak fixes from Zdenek - bitmap related fixes from Me and Tao - other fixes and cleanups" * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md: (33 commits) md: free unused memory after bitmap resize md: release allocated bitset sync_set md/bitmap: clear BITMAP_WRITE_ERROR bit before writing it to sb md: be cautious about using ->curr_resync_completed for ->recovery_offset badblocks: fix wrong return value in badblocks_set if badblocks are disabled md: don't check MD_SB_CHANGE_CLEAN in md_allow_write md-cluster: update document for raid10 md: remove redundant variable q raid1: remove obsolete code in raid1_write_request md-cluster: Use a small window for raid10 resync md-cluster: Suspend writes in RAID10 if within range md-cluster/raid10: set "do_balance = 0" if area is resyncing md: use lockdep_assert_held raid1: prevent freeze_array/wait_all_barriers deadlock md: use TASK_IDLE instead of blocking signals md: remove special meaning of ->quiesce(.., 2) md: allow metadata update while suspending. md: use mddev_suspend/resume instead of ->quiesce() md: move suspend_hi/lo handling into core md code md: don't call bitmap_create() while array is quiesced. ... --- 47f521ba18190e4bfbb65ead3977af5756884427 diff --cc drivers/md/md-bitmap.c index 000000000000,bb45c0ccc1bf..239c7bb3929b mode 000000,100644..100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@@ -1,0 -1,2610 +1,2610 @@@ + /* + * bitmap.c two-level bitmap (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 + * + * bitmap_create - sets up the bitmap structure + * bitmap_destroy - destroys the bitmap structure + * + * additions, Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.: + * - added disk storage for bitmap + * - changes to allow various bitmap chunk sizes + */ + + /* + * Still to do: + * + * flush after percent set rather than just time based. (maybe both). + */ + + #include + #include + #include + #include + #include + #include + #include + #include + #include + #include + #include + #include + #include + #include "md.h" + #include "md-bitmap.h" + + static inline char *bmname(struct bitmap *bitmap) + { + return bitmap->mddev ? mdname(bitmap->mddev) : "mdX"; + } + + /* + * check a page and, if necessary, allocate it (or hijack it if the alloc fails) + * + * 1) check to see if this page is allocated, if it's not then try to alloc + * 2) if the alloc fails, set the page's hijacked flag so we'll use the + * page pointer directly as a counter + * + * if we find our page, we increment the page's refcount so that it stays + * allocated while we're using it + */ + static int bitmap_checkpage(struct bitmap_counts *bitmap, + unsigned long page, int create, int no_hijack) + __releases(bitmap->lock) + __acquires(bitmap->lock) + { + unsigned char *mappage; + + if (page >= bitmap->pages) { + /* This can happen if bitmap_start_sync goes beyond + * End-of-device while looking for a whole page. + * It is harmless. + */ + return -EINVAL; + } + + if (bitmap->bp[page].hijacked) /* it's hijacked, don't try to alloc */ + return 0; + + if (bitmap->bp[page].map) /* page is already allocated, just return */ + return 0; + + if (!create) + return -ENOENT; + + /* this page has not been allocated yet */ + + spin_unlock_irq(&bitmap->lock); + /* It is possible that this is being called inside a + * prepare_to_wait/finish_wait loop from raid5c:make_request(). + * In general it is not permitted to sleep in that context as it + * can cause the loop to spin freely. + * That doesn't apply here as we can only reach this point + * once with any loop. + * When this function completes, either bp[page].map or + * bp[page].hijacked. In either case, this function will + * abort before getting to this point again. So there is + * no risk of a free-spin, and so it is safe to assert + * that sleeping here is allowed. + */ + sched_annotate_sleep(); + mappage = kzalloc(PAGE_SIZE, GFP_NOIO); + spin_lock_irq(&bitmap->lock); + + if (mappage == NULL) { + pr_debug("md/bitmap: map page allocation failed, hijacking\n"); + /* We don't support hijack for cluster raid */ + if (no_hijack) + return -ENOMEM; + /* failed - set the hijacked flag so that we can use the + * pointer as a counter */ + if (!bitmap->bp[page].map) + bitmap->bp[page].hijacked = 1; + } else if (bitmap->bp[page].map || + bitmap->bp[page].hijacked) { + /* somebody beat us to getting the page */ + kfree(mappage); + } else { + + /* no page was in place and we have one, so install it */ + + bitmap->bp[page].map = mappage; + bitmap->missing_pages--; + } + return 0; + } + + /* if page is completely empty, put it back on the free list, or dealloc it */ + /* if page was hijacked, unmark the flag so it might get alloced next time */ + /* Note: lock should be held when calling this */ + static void bitmap_checkfree(struct bitmap_counts *bitmap, unsigned long page) + { + char *ptr; + + if (bitmap->bp[page].count) /* page is still busy */ + return; + + /* page is no longer in use, it can be released */ + + if (bitmap->bp[page].hijacked) { /* page was hijacked, undo this now */ + bitmap->bp[page].hijacked = 0; + bitmap->bp[page].map = NULL; + } else { + /* normal case, free the page */ + ptr = bitmap->bp[page].map; + bitmap->bp[page].map = NULL; + bitmap->missing_pages++; + kfree(ptr); + } + } + + /* + * bitmap file handling - read and write the bitmap file and its superblock + */ + + /* + * basic page I/O operations + */ + + /* IO operations when bitmap is stored near all superblocks */ + static int read_sb_page(struct mddev *mddev, loff_t offset, + struct page *page, + unsigned long index, int size) + { + /* choose a good rdev and read the page from there */ + + struct md_rdev *rdev; + sector_t target; + + rdev_for_each(rdev, mddev) { + if (! test_bit(In_sync, &rdev->flags) + || test_bit(Faulty, &rdev->flags) + || test_bit(Bitmap_sync, &rdev->flags)) + continue; + + target = offset + index * (PAGE_SIZE/512); + + if (sync_page_io(rdev, target, + roundup(size, bdev_logical_block_size(rdev->bdev)), + page, REQ_OP_READ, 0, true)) { + page->index = index; + return 0; + } + } + return -EIO; + } + + static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mddev) + { + /* Iterate the disks of an mddev, using rcu to protect access to the + * linked list, and raising the refcount of devices we return to ensure + * they don't disappear while in use. + * As devices are only added or removed when raid_disk is < 0 and + * nr_pending is 0 and In_sync is clear, the entries we return will + * still be in the same position on the list when we re-enter + * list_for_each_entry_continue_rcu. + * + * Note that if entered with 'rdev == NULL' to start at the + * beginning, we temporarily assign 'rdev' to an address which + * isn't really an rdev, but which can be used by + * list_for_each_entry_continue_rcu() to find the first entry. + */ + rcu_read_lock(); + if (rdev == NULL) + /* start at the beginning */ + rdev = list_entry(&mddev->disks, struct md_rdev, same_set); + else { + /* release the previous rdev and start from there. */ + rdev_dec_pending(rdev, mddev); + } + list_for_each_entry_continue_rcu(rdev, &mddev->disks, same_set) { + if (rdev->raid_disk >= 0 && + !test_bit(Faulty, &rdev->flags)) { + /* this is a usable devices */ + atomic_inc(&rdev->nr_pending); + rcu_read_unlock(); + return rdev; + } + } + rcu_read_unlock(); + return NULL; + } + + static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) + { + struct md_rdev *rdev; + struct block_device *bdev; + struct mddev *mddev = bitmap->mddev; + struct bitmap_storage *store = &bitmap->storage; + + restart: + rdev = NULL; + while ((rdev = next_active_rdev(rdev, mddev)) != NULL) { + int size = PAGE_SIZE; + loff_t offset = mddev->bitmap_info.offset; + + bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; + + if (page->index == store->file_pages-1) { + int last_page_size = store->bytes & (PAGE_SIZE-1); + if (last_page_size == 0) + last_page_size = PAGE_SIZE; + size = roundup(last_page_size, + bdev_logical_block_size(bdev)); + } + /* Just make sure we aren't corrupting data or + * metadata + */ + if (mddev->external) { + /* Bitmap could be anywhere. */ + if (rdev->sb_start + offset + (page->index + * (PAGE_SIZE/512)) + > rdev->data_offset + && + rdev->sb_start + offset + < (rdev->data_offset + mddev->dev_sectors + + (PAGE_SIZE/512))) + goto bad_alignment; + } else if (offset < 0) { + /* DATA BITMAP METADATA */ + if (offset + + (long)(page->index * (PAGE_SIZE/512)) + + size/512 > 0) + /* bitmap runs in to metadata */ + goto bad_alignment; + if (rdev->data_offset + mddev->dev_sectors + > rdev->sb_start + offset) + /* data runs in to bitmap */ + goto bad_alignment; + } else if (rdev->sb_start < rdev->data_offset) { + /* METADATA BITMAP DATA */ + if (rdev->sb_start + + offset + + page->index*(PAGE_SIZE/512) + size/512 + > rdev->data_offset) + /* bitmap runs in to data */ + goto bad_alignment; + } else { + /* DATA METADATA BITMAP - no problems */ + } + md_super_write(mddev, rdev, + rdev->sb_start + offset + + page->index * (PAGE_SIZE/512), + size, + page); + } + + if (wait && md_super_wait(mddev) < 0) + goto restart; + return 0; + + bad_alignment: + return -EINVAL; + } + + static void bitmap_file_kick(struct bitmap *bitmap); + /* + * write out a page to a file + */ + static void write_page(struct bitmap *bitmap, struct page *page, int wait) + { + struct buffer_head *bh; + + if (bitmap->storage.file == NULL) { + switch (write_sb_page(bitmap, page, wait)) { + case -EINVAL: + set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); + } + } else { + + bh = page_buffers(page); + + while (bh && bh->b_blocknr) { + atomic_inc(&bitmap->pending_writes); + set_buffer_locked(bh); + set_buffer_mapped(bh); + submit_bh(REQ_OP_WRITE, REQ_SYNC, bh); + bh = bh->b_this_page; + } + + if (wait) + wait_event(bitmap->write_wait, + atomic_read(&bitmap->pending_writes)==0); + } + if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) + bitmap_file_kick(bitmap); + } + + static void end_bitmap_write(struct buffer_head *bh, int uptodate) + { + struct bitmap *bitmap = bh->b_private; + + if (!uptodate) + set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); + if (atomic_dec_and_test(&bitmap->pending_writes)) + wake_up(&bitmap->write_wait); + } + + /* copied from buffer.c */ + static void + __clear_page_buffers(struct page *page) + { + ClearPagePrivate(page); + set_page_private(page, 0); + put_page(page); + } + static void free_buffers(struct page *page) + { + struct buffer_head *bh; + + if (!PagePrivate(page)) + return; + + bh = page_buffers(page); + while (bh) { + struct buffer_head *next = bh->b_this_page; + free_buffer_head(bh); + bh = next; + } + __clear_page_buffers(page); + put_page(page); + } + + /* read a page from a file. + * We both read the page, and attach buffers to the page to record the + * address of each block (using bmap). These addresses will be used + * to write the block later, completely bypassing the filesystem. + * This usage is similar to how swap files are handled, and allows us + * to write to a file with no concerns of memory allocation failing. + */ + static int read_page(struct file *file, unsigned long index, + struct bitmap *bitmap, + unsigned long count, + struct page *page) + { + int ret = 0; + struct inode *inode = file_inode(file); + struct buffer_head *bh; + sector_t block; + + pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, + (unsigned long long)index << PAGE_SHIFT); + - bh = alloc_page_buffers(page, 1<i_blkbits, 0); ++ bh = alloc_page_buffers(page, 1<i_blkbits, false); + if (!bh) { + ret = -ENOMEM; + goto out; + } + attach_page_buffers(page, bh); + block = index << (PAGE_SHIFT - inode->i_blkbits); + while (bh) { + if (count == 0) + bh->b_blocknr = 0; + else { + bh->b_blocknr = bmap(inode, block); + if (bh->b_blocknr == 0) { + /* Cannot use this file! */ + ret = -EINVAL; + goto out; + } + bh->b_bdev = inode->i_sb->s_bdev; + if (count < (1<i_blkbits)) + count = 0; + else + count -= (1<i_blkbits); + + bh->b_end_io = end_bitmap_write; + bh->b_private = bitmap; + atomic_inc(&bitmap->pending_writes); + set_buffer_locked(bh); + set_buffer_mapped(bh); + submit_bh(REQ_OP_READ, 0, bh); + } + block++; + bh = bh->b_this_page; + } + page->index = index; + + wait_event(bitmap->write_wait, + atomic_read(&bitmap->pending_writes)==0); + if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) + ret = -EIO; + out: + if (ret) + pr_err("md: bitmap read error: (%dB @ %llu): %d\n", + (int)PAGE_SIZE, + (unsigned long long)index << PAGE_SHIFT, + ret); + return ret; + } + + /* + * bitmap file superblock operations + */ + + /* + * bitmap_wait_writes() should be called before writing any bitmap + * blocks, to ensure previous writes, particularly from + * bitmap_daemon_work(), have completed. + */ + static void bitmap_wait_writes(struct bitmap *bitmap) + { + if (bitmap->storage.file) + wait_event(bitmap->write_wait, + atomic_read(&bitmap->pending_writes)==0); + else + /* Note that we ignore the return value. The writes + * might have failed, but that would just mean that + * some bits which should be cleared haven't been, + * which is safe. The relevant bitmap blocks will + * probably get written again, but there is no great + * loss if they aren't. + */ + md_super_wait(bitmap->mddev); + } + + + /* update the event counter and sync the superblock to disk */ + void bitmap_update_sb(struct bitmap *bitmap) + { + bitmap_super_t *sb; + + if (!bitmap || !bitmap->mddev) /* no bitmap for this array */ + return; + if (bitmap->mddev->bitmap_info.external) + return; + if (!bitmap->storage.sb_page) /* no superblock */ + return; + sb = kmap_atomic(bitmap->storage.sb_page); + sb->events = cpu_to_le64(bitmap->mddev->events); + if (bitmap->mddev->events < bitmap->events_cleared) + /* rocking back to read-only */ + bitmap->events_cleared = bitmap->mddev->events; + sb->events_cleared = cpu_to_le64(bitmap->events_cleared); + /* + * clear BITMAP_WRITE_ERROR bit to protect against the case that + * a bitmap write error occurred but the later writes succeeded. + */ + sb->state = cpu_to_le32(bitmap->flags & ~BIT(BITMAP_WRITE_ERROR)); + /* Just in case these have been changed via sysfs: */ + sb->daemon_sleep = cpu_to_le32(bitmap->mddev->bitmap_info.daemon_sleep/HZ); + sb->write_behind = cpu_to_le32(bitmap->mddev->bitmap_info.max_write_behind); + /* This might have been changed by a reshape */ + sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); + sb->chunksize = cpu_to_le32(bitmap->mddev->bitmap_info.chunksize); + sb->nodes = cpu_to_le32(bitmap->mddev->bitmap_info.nodes); + sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> + bitmap_info.space); + kunmap_atomic(sb); + write_page(bitmap, bitmap->storage.sb_page, 1); + } + EXPORT_SYMBOL(bitmap_update_sb); + + /* print out the bitmap file superblock */ + void bitmap_print_sb(struct bitmap *bitmap) + { + bitmap_super_t *sb; + + if (!bitmap || !bitmap->storage.sb_page) + return; + sb = kmap_atomic(bitmap->storage.sb_page); + pr_debug("%s: bitmap file superblock:\n", bmname(bitmap)); + pr_debug(" magic: %08x\n", le32_to_cpu(sb->magic)); + pr_debug(" version: %d\n", le32_to_cpu(sb->version)); + pr_debug(" uuid: %08x.%08x.%08x.%08x\n", + le32_to_cpu(*(__u32 *)(sb->uuid+0)), + le32_to_cpu(*(__u32 *)(sb->uuid+4)), + le32_to_cpu(*(__u32 *)(sb->uuid+8)), + le32_to_cpu(*(__u32 *)(sb->uuid+12))); + pr_debug(" events: %llu\n", + (unsigned long long) le64_to_cpu(sb->events)); + pr_debug("events cleared: %llu\n", + (unsigned long long) le64_to_cpu(sb->events_cleared)); + pr_debug(" state: %08x\n", le32_to_cpu(sb->state)); + pr_debug(" chunksize: %d B\n", le32_to_cpu(sb->chunksize)); + pr_debug(" daemon sleep: %ds\n", le32_to_cpu(sb->daemon_sleep)); + pr_debug(" sync size: %llu KB\n", + (unsigned long long)le64_to_cpu(sb->sync_size)/2); + pr_debug("max write behind: %d\n", le32_to_cpu(sb->write_behind)); + kunmap_atomic(sb); + } + + /* + * bitmap_new_disk_sb + * @bitmap + * + * This function is somewhat the reverse of bitmap_read_sb. bitmap_read_sb + * reads and verifies the on-disk bitmap superblock and populates bitmap_info. + * This function verifies 'bitmap_info' and populates the on-disk bitmap + * structure, which is to be written to disk. + * + * Returns: 0 on success, -Exxx on error + */ + static int bitmap_new_disk_sb(struct bitmap *bitmap) + { + bitmap_super_t *sb; + unsigned long chunksize, daemon_sleep, write_behind; + + bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO); + if (bitmap->storage.sb_page == NULL) + return -ENOMEM; + bitmap->storage.sb_page->index = 0; + + sb = kmap_atomic(bitmap->storage.sb_page); + + sb->magic = cpu_to_le32(BITMAP_MAGIC); + sb->version = cpu_to_le32(BITMAP_MAJOR_HI); + + chunksize = bitmap->mddev->bitmap_info.chunksize; + BUG_ON(!chunksize); + if (!is_power_of_2(chunksize)) { + kunmap_atomic(sb); + pr_warn("bitmap chunksize not a power of 2\n"); + return -EINVAL; + } + sb->chunksize = cpu_to_le32(chunksize); + + daemon_sleep = bitmap->mddev->bitmap_info.daemon_sleep; + if (!daemon_sleep || (daemon_sleep > MAX_SCHEDULE_TIMEOUT)) { + pr_debug("Choosing daemon_sleep default (5 sec)\n"); + daemon_sleep = 5 * HZ; + } + sb->daemon_sleep = cpu_to_le32(daemon_sleep); + bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; + + /* + * FIXME: write_behind for RAID1. If not specified, what + * is a good choice? We choose COUNTER_MAX / 2 arbitrarily. + */ + write_behind = bitmap->mddev->bitmap_info.max_write_behind; + if (write_behind > COUNTER_MAX) + write_behind = COUNTER_MAX / 2; + sb->write_behind = cpu_to_le32(write_behind); + bitmap->mddev->bitmap_info.max_write_behind = write_behind; + + /* keep the array size field of the bitmap superblock up to date */ + sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); + + memcpy(sb->uuid, bitmap->mddev->uuid, 16); + + set_bit(BITMAP_STALE, &bitmap->flags); + sb->state = cpu_to_le32(bitmap->flags); + bitmap->events_cleared = bitmap->mddev->events; + sb->events_cleared = cpu_to_le64(bitmap->mddev->events); + bitmap->mddev->bitmap_info.nodes = 0; + + kunmap_atomic(sb); + + return 0; + } + + /* read the superblock from the bitmap file and initialize some bitmap fields */ + static int bitmap_read_sb(struct bitmap *bitmap) + { + char *reason = NULL; + bitmap_super_t *sb; + unsigned long chunksize, daemon_sleep, write_behind; + unsigned long long events; + int nodes = 0; + unsigned long sectors_reserved = 0; + int err = -EINVAL; + struct page *sb_page; + loff_t offset = bitmap->mddev->bitmap_info.offset; + + if (!bitmap->storage.file && !bitmap->mddev->bitmap_info.offset) { + chunksize = 128 * 1024 * 1024; + daemon_sleep = 5 * HZ; + write_behind = 0; + set_bit(BITMAP_STALE, &bitmap->flags); + err = 0; + goto out_no_sb; + } + /* page 0 is the superblock, read it... */ + sb_page = alloc_page(GFP_KERNEL); + if (!sb_page) + return -ENOMEM; + bitmap->storage.sb_page = sb_page; + + re_read: + /* If cluster_slot is set, the cluster is setup */ + if (bitmap->cluster_slot >= 0) { + sector_t bm_blocks = bitmap->mddev->resync_max_sectors; + + sector_div(bm_blocks, + bitmap->mddev->bitmap_info.chunksize >> 9); + /* bits to bytes */ + bm_blocks = ((bm_blocks+7) >> 3) + sizeof(bitmap_super_t); + /* to 4k blocks */ + bm_blocks = DIV_ROUND_UP_SECTOR_T(bm_blocks, 4096); + offset = bitmap->mddev->bitmap_info.offset + (bitmap->cluster_slot * (bm_blocks << 3)); + pr_debug("%s:%d bm slot: %d offset: %llu\n", __func__, __LINE__, + bitmap->cluster_slot, offset); + } + + if (bitmap->storage.file) { + loff_t isize = i_size_read(bitmap->storage.file->f_mapping->host); + int bytes = isize > PAGE_SIZE ? PAGE_SIZE : isize; + + err = read_page(bitmap->storage.file, 0, + bitmap, bytes, sb_page); + } else { + err = read_sb_page(bitmap->mddev, + offset, + sb_page, + 0, sizeof(bitmap_super_t)); + } + if (err) + return err; + + err = -EINVAL; + sb = kmap_atomic(sb_page); + + chunksize = le32_to_cpu(sb->chunksize); + daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; + write_behind = le32_to_cpu(sb->write_behind); + sectors_reserved = le32_to_cpu(sb->sectors_reserved); + /* Setup nodes/clustername only if bitmap version is + * cluster-compatible + */ + if (sb->version == cpu_to_le32(BITMAP_MAJOR_CLUSTERED)) { + nodes = le32_to_cpu(sb->nodes); + strlcpy(bitmap->mddev->bitmap_info.cluster_name, + sb->cluster_name, 64); + } + + /* verify that the bitmap-specific fields are valid */ + if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) + reason = "bad magic"; + else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || + le32_to_cpu(sb->version) > BITMAP_MAJOR_CLUSTERED) + reason = "unrecognized superblock version"; + else if (chunksize < 512) + reason = "bitmap chunksize too small"; + else if (!is_power_of_2(chunksize)) + reason = "bitmap chunksize not a power of 2"; + else if (daemon_sleep < 1 || daemon_sleep > MAX_SCHEDULE_TIMEOUT) + reason = "daemon sleep period out of range"; + else if (write_behind > COUNTER_MAX) + reason = "write-behind limit out of range (0 - 16383)"; + if (reason) { + pr_warn("%s: invalid bitmap file superblock: %s\n", + bmname(bitmap), reason); + goto out; + } + + /* keep the array size field of the bitmap superblock up to date */ + sb->sync_size = cpu_to_le64(bitmap->mddev->resync_max_sectors); + + if (bitmap->mddev->persistent) { + /* + * We have a persistent array superblock, so compare the + * bitmap's UUID and event counter to the mddev's + */ + if (memcmp(sb->uuid, bitmap->mddev->uuid, 16)) { + pr_warn("%s: bitmap superblock UUID mismatch\n", + bmname(bitmap)); + goto out; + } + events = le64_to_cpu(sb->events); + if (!nodes && (events < bitmap->mddev->events)) { + pr_warn("%s: bitmap file is out of date (%llu < %llu) -- forcing full recovery\n", + bmname(bitmap), events, + (unsigned long long) bitmap->mddev->events); + set_bit(BITMAP_STALE, &bitmap->flags); + } + } + + /* assign fields using values from superblock */ + bitmap->flags |= le32_to_cpu(sb->state); + if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) + set_bit(BITMAP_HOSTENDIAN, &bitmap->flags); + bitmap->events_cleared = le64_to_cpu(sb->events_cleared); + strlcpy(bitmap->mddev->bitmap_info.cluster_name, sb->cluster_name, 64); + err = 0; + + out: + kunmap_atomic(sb); + /* Assigning chunksize is required for "re_read" */ + bitmap->mddev->bitmap_info.chunksize = chunksize; + if (err == 0 && nodes && (bitmap->cluster_slot < 0)) { + err = md_setup_cluster(bitmap->mddev, nodes); + if (err) { + pr_warn("%s: Could not setup cluster service (%d)\n", + bmname(bitmap), err); + goto out_no_sb; + } + bitmap->cluster_slot = md_cluster_ops->slot_number(bitmap->mddev); + goto re_read; + } + + + out_no_sb: + if (test_bit(BITMAP_STALE, &bitmap->flags)) + bitmap->events_cleared = bitmap->mddev->events; + bitmap->mddev->bitmap_info.chunksize = chunksize; + bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; + bitmap->mddev->bitmap_info.max_write_behind = write_behind; + bitmap->mddev->bitmap_info.nodes = nodes; + if (bitmap->mddev->bitmap_info.space == 0 || + bitmap->mddev->bitmap_info.space > sectors_reserved) + bitmap->mddev->bitmap_info.space = sectors_reserved; + if (err) { + bitmap_print_sb(bitmap); + if (bitmap->cluster_slot < 0) + md_cluster_stop(bitmap->mddev); + } + return err; + } + + /* + * general bitmap file operations + */ + + /* + * on-disk bitmap: + * + * Use one bit per "chunk" (block set). We do the disk I/O on the bitmap + * file a page at a time. There's a superblock at the start of the file. + */ + /* calculate the index of the page that contains this bit */ + static inline unsigned long file_page_index(struct bitmap_storage *store, + unsigned long chunk) + { + if (store->sb_page) + chunk += sizeof(bitmap_super_t) << 3; + return chunk >> PAGE_BIT_SHIFT; + } + + /* calculate the (bit) offset of this bit within a page */ + static inline unsigned long file_page_offset(struct bitmap_storage *store, + unsigned long chunk) + { + if (store->sb_page) + chunk += sizeof(bitmap_super_t) << 3; + return chunk & (PAGE_BITS - 1); + } + + /* + * return a pointer to the page in the filemap that contains the given bit + * + */ + static inline struct page *filemap_get_page(struct bitmap_storage *store, + unsigned long chunk) + { + if (file_page_index(store, chunk) >= store->file_pages) + return NULL; + return store->filemap[file_page_index(store, chunk)]; + } + + static int bitmap_storage_alloc(struct bitmap_storage *store, + unsigned long chunks, int with_super, + int slot_number) + { + int pnum, offset = 0; + unsigned long num_pages; + unsigned long bytes; + + bytes = DIV_ROUND_UP(chunks, 8); + if (with_super) + bytes += sizeof(bitmap_super_t); + + num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); + offset = slot_number * num_pages; + + store->filemap = kmalloc(sizeof(struct page *) + * num_pages, GFP_KERNEL); + if (!store->filemap) + return -ENOMEM; + + if (with_super && !store->sb_page) { + store->sb_page = alloc_page(GFP_KERNEL|__GFP_ZERO); + if (store->sb_page == NULL) + return -ENOMEM; + } + + pnum = 0; + if (store->sb_page) { + store->filemap[0] = store->sb_page; + pnum = 1; + store->sb_page->index = offset; + } + + for ( ; pnum < num_pages; pnum++) { + store->filemap[pnum] = alloc_page(GFP_KERNEL|__GFP_ZERO); + if (!store->filemap[pnum]) { + store->file_pages = pnum; + return -ENOMEM; + } + store->filemap[pnum]->index = pnum + offset; + } + store->file_pages = pnum; + + /* We need 4 bits per page, rounded up to a multiple + * of sizeof(unsigned long) */ + store->filemap_attr = kzalloc( + roundup(DIV_ROUND_UP(num_pages*4, 8), sizeof(unsigned long)), + GFP_KERNEL); + if (!store->filemap_attr) + return -ENOMEM; + + store->bytes = bytes; + + return 0; + } + + static void bitmap_file_unmap(struct bitmap_storage *store) + { + struct page **map, *sb_page; + int pages; + struct file *file; + + file = store->file; + map = store->filemap; + pages = store->file_pages; + sb_page = store->sb_page; + + while (pages--) + if (map[pages] != sb_page) /* 0 is sb_page, release it below */ + free_buffers(map[pages]); + kfree(map); + kfree(store->filemap_attr); + + if (sb_page) + free_buffers(sb_page); + + if (file) { + struct inode *inode = file_inode(file); + invalidate_mapping_pages(inode->i_mapping, 0, -1); + fput(file); + } + } + + /* + * bitmap_file_kick - if an error occurs while manipulating the bitmap file + * then it is no longer reliable, so we stop using it and we mark the file + * as failed in the superblock + */ + static void bitmap_file_kick(struct bitmap *bitmap) + { + char *path, *ptr = NULL; + + if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) { + bitmap_update_sb(bitmap); + + if (bitmap->storage.file) { + path = kmalloc(PAGE_SIZE, GFP_KERNEL); + if (path) + ptr = file_path(bitmap->storage.file, + path, PAGE_SIZE); + + pr_warn("%s: kicking failed bitmap file %s from array!\n", + bmname(bitmap), IS_ERR(ptr) ? "" : ptr); + + kfree(path); + } else + pr_warn("%s: disabling internal bitmap due to errors\n", + bmname(bitmap)); + } + } + + enum bitmap_page_attr { + BITMAP_PAGE_DIRTY = 0, /* there are set bits that need to be synced */ + BITMAP_PAGE_PENDING = 1, /* there are bits that are being cleaned. + * i.e. counter is 1 or 2. */ + BITMAP_PAGE_NEEDWRITE = 2, /* there are cleared bits that need to be synced */ + }; + + static inline void set_page_attr(struct bitmap *bitmap, int pnum, + enum bitmap_page_attr attr) + { + set_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); + } + + static inline void clear_page_attr(struct bitmap *bitmap, int pnum, + enum bitmap_page_attr attr) + { + clear_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); + } + + static inline int test_page_attr(struct bitmap *bitmap, int pnum, + enum bitmap_page_attr attr) + { + return test_bit((pnum<<2) + attr, bitmap->storage.filemap_attr); + } + + static inline int test_and_clear_page_attr(struct bitmap *bitmap, int pnum, + enum bitmap_page_attr attr) + { + return test_and_clear_bit((pnum<<2) + attr, + bitmap->storage.filemap_attr); + } + /* + * bitmap_file_set_bit -- called before performing a write to the md device + * to set (and eventually sync) a particular bit in the bitmap file + * + * we set the bit immediately, then we record the page number so that + * when an unplug occurs, we can flush the dirty pages out to disk + */ + static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) + { + unsigned long bit; + struct page *page; + void *kaddr; + unsigned long chunk = block >> bitmap->counts.chunkshift; + struct bitmap_storage *store = &bitmap->storage; + unsigned long node_offset = 0; + + if (mddev_is_clustered(bitmap->mddev)) + node_offset = bitmap->cluster_slot * store->file_pages; + + page = filemap_get_page(&bitmap->storage, chunk); + if (!page) + return; + bit = file_page_offset(&bitmap->storage, chunk); + + /* set the bit */ + kaddr = kmap_atomic(page); + if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) + set_bit(bit, kaddr); + else + set_bit_le(bit, kaddr); + kunmap_atomic(kaddr); + pr_debug("set file bit %lu page %lu\n", bit, page->index); + /* record page number so it gets flushed to disk when unplug occurs */ + set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_DIRTY); + } + + static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) + { + unsigned long bit; + struct page *page; + void *paddr; + unsigned long chunk = block >> bitmap->counts.chunkshift; + struct bitmap_storage *store = &bitmap->storage; + unsigned long node_offset = 0; + + if (mddev_is_clustered(bitmap->mddev)) + node_offset = bitmap->cluster_slot * store->file_pages; + + page = filemap_get_page(&bitmap->storage, chunk); + if (!page) + return; + bit = file_page_offset(&bitmap->storage, chunk); + paddr = kmap_atomic(page); + if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) + clear_bit(bit, paddr); + else + clear_bit_le(bit, paddr); + kunmap_atomic(paddr); + if (!test_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_NEEDWRITE)) { + set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_PENDING); + bitmap->allclean = 0; + } + } + + static int bitmap_file_test_bit(struct bitmap *bitmap, sector_t block) + { + unsigned long bit; + struct page *page; + void *paddr; + unsigned long chunk = block >> bitmap->counts.chunkshift; + int set = 0; + + page = filemap_get_page(&bitmap->storage, chunk); + if (!page) + return -EINVAL; + bit = file_page_offset(&bitmap->storage, chunk); + paddr = kmap_atomic(page); + if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) + set = test_bit(bit, paddr); + else + set = test_bit_le(bit, paddr); + kunmap_atomic(paddr); + return set; + } + + + /* this gets called when the md device is ready to unplug its underlying + * (slave) device queues -- before we let any writes go down, we need to + * sync the dirty pages of the bitmap file to disk */ + void bitmap_unplug(struct bitmap *bitmap) + { + unsigned long i; + int dirty, need_write; + int writing = 0; + + if (!bitmap || !bitmap->storage.filemap || + test_bit(BITMAP_STALE, &bitmap->flags)) + return; + + /* look at each page to see if there are any set bits that need to be + * flushed out to disk */ + for (i = 0; i < bitmap->storage.file_pages; i++) { + if (!bitmap->storage.filemap) + return; + dirty = test_and_clear_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); + need_write = test_and_clear_page_attr(bitmap, i, + BITMAP_PAGE_NEEDWRITE); + if (dirty || need_write) { + if (!writing) { + bitmap_wait_writes(bitmap); + if (bitmap->mddev->queue) + blk_add_trace_msg(bitmap->mddev->queue, + "md bitmap_unplug"); + } + clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); + write_page(bitmap, bitmap->storage.filemap[i], 0); + writing = 1; + } + } + if (writing) + bitmap_wait_writes(bitmap); + + if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) + bitmap_file_kick(bitmap); + } + EXPORT_SYMBOL(bitmap_unplug); + + static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed); + /* * bitmap_init_from_disk -- called at bitmap_create time to initialize + * the in-memory bitmap from the on-disk bitmap -- also, sets up the + * memory mapping of the bitmap file + * Special cases: + * if there's no bitmap file, or if the bitmap file had been + * previously kicked from the array, we mark all the bits as + * 1's in order to cause a full resync. + * + * We ignore all bits for sectors that end earlier than 'start'. + * This is used when reading an out-of-date bitmap... + */ + static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) + { + unsigned long i, chunks, index, oldindex, bit, node_offset = 0; + struct page *page = NULL; + unsigned long bit_cnt = 0; + struct file *file; + unsigned long offset; + int outofdate; + int ret = -ENOSPC; + void *paddr; + struct bitmap_storage *store = &bitmap->storage; + + chunks = bitmap->counts.chunks; + file = store->file; + + if (!file && !bitmap->mddev->bitmap_info.offset) { + /* No permanent bitmap - fill with '1s'. */ + store->filemap = NULL; + store->file_pages = 0; + for (i = 0; i < chunks ; i++) { + /* if the disk bit is set, set the memory bit */ + int needed = ((sector_t)(i+1) << (bitmap->counts.chunkshift) + >= start); + bitmap_set_memory_bits(bitmap, + (sector_t)i << bitmap->counts.chunkshift, + needed); + } + return 0; + } + + outofdate = test_bit(BITMAP_STALE, &bitmap->flags); + if (outofdate) + pr_warn("%s: bitmap file is out of date, doing full recovery\n", bmname(bitmap)); + + if (file && i_size_read(file->f_mapping->host) < store->bytes) { + pr_warn("%s: bitmap file too short %lu < %lu\n", + bmname(bitmap), + (unsigned long) i_size_read(file->f_mapping->host), + store->bytes); + goto err; + } + + oldindex = ~0L; + offset = 0; + if (!bitmap->mddev->bitmap_info.external) + offset = sizeof(bitmap_super_t); + + if (mddev_is_clustered(bitmap->mddev)) + node_offset = bitmap->cluster_slot * (DIV_ROUND_UP(store->bytes, PAGE_SIZE)); + + for (i = 0; i < chunks; i++) { + int b; + index = file_page_index(&bitmap->storage, i); + bit = file_page_offset(&bitmap->storage, i); + if (index != oldindex) { /* this is a new page, read it in */ + int count; + /* unmap the old page, we're done with it */ + if (index == store->file_pages-1) + count = store->bytes - index * PAGE_SIZE; + else + count = PAGE_SIZE; + page = store->filemap[index]; + if (file) + ret = read_page(file, index, bitmap, + count, page); + else + ret = read_sb_page( + bitmap->mddev, + bitmap->mddev->bitmap_info.offset, + page, + index + node_offset, count); + + if (ret) + goto err; + + oldindex = index; + + if (outofdate) { + /* + * if bitmap is out of date, dirty the + * whole page and write it out + */ + paddr = kmap_atomic(page); + memset(paddr + offset, 0xff, + PAGE_SIZE - offset); + kunmap_atomic(paddr); + write_page(bitmap, page, 1); + + ret = -EIO; + if (test_bit(BITMAP_WRITE_ERROR, + &bitmap->flags)) + goto err; + } + } + paddr = kmap_atomic(page); + if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags)) + b = test_bit(bit, paddr); + else + b = test_bit_le(bit, paddr); + kunmap_atomic(paddr); + if (b) { + /* if the disk bit is set, set the memory bit */ + int needed = ((sector_t)(i+1) << bitmap->counts.chunkshift + >= start); + bitmap_set_memory_bits(bitmap, + (sector_t)i << bitmap->counts.chunkshift, + needed); + bit_cnt++; + } + offset = 0; + } + + pr_debug("%s: bitmap initialized from disk: read %lu pages, set %lu of %lu bits\n", + bmname(bitmap), store->file_pages, + bit_cnt, chunks); + + return 0; + + err: + pr_warn("%s: bitmap initialisation failed: %d\n", + bmname(bitmap), ret); + return ret; + } + + void bitmap_write_all(struct bitmap *bitmap) + { + /* We don't actually write all bitmap blocks here, + * just flag them as needing to be written + */ + int i; + + if (!bitmap || !bitmap->storage.filemap) + return; + if (bitmap->storage.file) + /* Only one copy, so nothing needed */ + return; + + for (i = 0; i < bitmap->storage.file_pages; i++) + set_page_attr(bitmap, i, + BITMAP_PAGE_NEEDWRITE); + bitmap->allclean = 0; + } + + static void bitmap_count_page(struct bitmap_counts *bitmap, + sector_t offset, int inc) + { + sector_t chunk = offset >> bitmap->chunkshift; + unsigned long page = chunk >> PAGE_COUNTER_SHIFT; + bitmap->bp[page].count += inc; + bitmap_checkfree(bitmap, page); + } + + static void bitmap_set_pending(struct bitmap_counts *bitmap, sector_t offset) + { + sector_t chunk = offset >> bitmap->chunkshift; + unsigned long page = chunk >> PAGE_COUNTER_SHIFT; + struct bitmap_page *bp = &bitmap->bp[page]; + + if (!bp->pending) + bp->pending = 1; + } + + static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, + sector_t offset, sector_t *blocks, + int create); + + /* + * bitmap daemon -- periodically wakes up to clean bits and flush pages + * out to disk + */ + + void bitmap_daemon_work(struct mddev *mddev) + { + struct bitmap *bitmap; + unsigned long j; + unsigned long nextpage; + sector_t blocks; + struct bitmap_counts *counts; + + /* Use a mutex to guard daemon_work against + * bitmap_destroy. + */ + mutex_lock(&mddev->bitmap_info.mutex); + bitmap = mddev->bitmap; + if (bitmap == NULL) { + mutex_unlock(&mddev->bitmap_info.mutex); + return; + } + if (time_before(jiffies, bitmap->daemon_lastrun + + mddev->bitmap_info.daemon_sleep)) + goto done; + + bitmap->daemon_lastrun = jiffies; + if (bitmap->allclean) { + mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; + goto done; + } + bitmap->allclean = 1; + + if (bitmap->mddev->queue) + blk_add_trace_msg(bitmap->mddev->queue, + "md bitmap_daemon_work"); + + /* Any file-page which is PENDING now needs to be written. + * So set NEEDWRITE now, then after we make any last-minute changes + * we will write it. + */ + for (j = 0; j < bitmap->storage.file_pages; j++) + if (test_and_clear_page_attr(bitmap, j, + BITMAP_PAGE_PENDING)) + set_page_attr(bitmap, j, + BITMAP_PAGE_NEEDWRITE); + + if (bitmap->need_sync && + mddev->bitmap_info.external == 0) { + /* Arrange for superblock update as well as + * other changes */ + bitmap_super_t *sb; + bitmap->need_sync = 0; + if (bitmap->storage.filemap) { + sb = kmap_atomic(bitmap->storage.sb_page); + sb->events_cleared = + cpu_to_le64(bitmap->events_cleared); + kunmap_atomic(sb); + set_page_attr(bitmap, 0, + BITMAP_PAGE_NEEDWRITE); + } + } + /* Now look at the bitmap counters and if any are '2' or '1', + * decrement and handle accordingly. + */ + counts = &bitmap->counts; + spin_lock_irq(&counts->lock); + nextpage = 0; + for (j = 0; j < counts->chunks; j++) { + bitmap_counter_t *bmc; + sector_t block = (sector_t)j << counts->chunkshift; + + if (j == nextpage) { + nextpage += PAGE_COUNTER_RATIO; + if (!counts->bp[j >> PAGE_COUNTER_SHIFT].pending) { + j |= PAGE_COUNTER_MASK; + continue; + } + counts->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; + } + bmc = bitmap_get_counter(counts, + block, + &blocks, 0); + + if (!bmc) { + j |= PAGE_COUNTER_MASK; + continue; + } + if (*bmc == 1 && !bitmap->need_sync) { + /* We can clear the bit */ + *bmc = 0; + bitmap_count_page(counts, block, -1); + bitmap_file_clear_bit(bitmap, block); + } else if (*bmc && *bmc <= 2) { + *bmc = 1; + bitmap_set_pending(counts, block); + bitmap->allclean = 0; + } + } + spin_unlock_irq(&counts->lock); + + bitmap_wait_writes(bitmap); + /* Now start writeout on any page in NEEDWRITE that isn't DIRTY. + * DIRTY pages need to be written by bitmap_unplug so it can wait + * for them. + * If we find any DIRTY page we stop there and let bitmap_unplug + * handle all the rest. This is important in the case where + * the first blocking holds the superblock and it has been updated. + * We mustn't write any other blocks before the superblock. + */ + for (j = 0; + j < bitmap->storage.file_pages + && !test_bit(BITMAP_STALE, &bitmap->flags); + j++) { + if (test_page_attr(bitmap, j, + BITMAP_PAGE_DIRTY)) + /* bitmap_unplug will handle the rest */ + break; + if (test_and_clear_page_attr(bitmap, j, + BITMAP_PAGE_NEEDWRITE)) { + write_page(bitmap, bitmap->storage.filemap[j], 0); + } + } + + done: + if (bitmap->allclean == 0) + mddev->thread->timeout = + mddev->bitmap_info.daemon_sleep; + mutex_unlock(&mddev->bitmap_info.mutex); + } + + static bitmap_counter_t *bitmap_get_counter(struct bitmap_counts *bitmap, + sector_t offset, sector_t *blocks, + int create) + __releases(bitmap->lock) + __acquires(bitmap->lock) + { + /* If 'create', we might release the lock and reclaim it. + * The lock must have been taken with interrupts enabled. + * If !create, we don't release the lock. + */ + sector_t chunk = offset >> bitmap->chunkshift; + unsigned long page = chunk >> PAGE_COUNTER_SHIFT; + unsigned long pageoff = (chunk & PAGE_COUNTER_MASK) << COUNTER_BYTE_SHIFT; + sector_t csize; + int err; + + err = bitmap_checkpage(bitmap, page, create, 0); + + if (bitmap->bp[page].hijacked || + bitmap->bp[page].map == NULL) + csize = ((sector_t)1) << (bitmap->chunkshift + + PAGE_COUNTER_SHIFT - 1); + else + csize = ((sector_t)1) << bitmap->chunkshift; + *blocks = csize - (offset & (csize - 1)); + + if (err < 0) + return NULL; + + /* now locked ... */ + + if (bitmap->bp[page].hijacked) { /* hijacked pointer */ + /* should we use the first or second counter field + * of the hijacked pointer? */ + int hi = (pageoff > PAGE_COUNTER_MASK); + return &((bitmap_counter_t *) + &bitmap->bp[page].map)[hi]; + } else /* page is allocated */ + return (bitmap_counter_t *) + &(bitmap->bp[page].map[pageoff]); + } + + int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, int behind) + { + if (!bitmap) + return 0; + + if (behind) { + int bw; + atomic_inc(&bitmap->behind_writes); + bw = atomic_read(&bitmap->behind_writes); + if (bw > bitmap->behind_writes_used) + bitmap->behind_writes_used = bw; + + pr_debug("inc write-behind count %d/%lu\n", + bw, bitmap->mddev->bitmap_info.max_write_behind); + } + + while (sectors) { + sector_t blocks; + bitmap_counter_t *bmc; + + spin_lock_irq(&bitmap->counts.lock); + bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 1); + if (!bmc) { + spin_unlock_irq(&bitmap->counts.lock); + return 0; + } + + if (unlikely(COUNTER(*bmc) == COUNTER_MAX)) { + DEFINE_WAIT(__wait); + /* note that it is safe to do the prepare_to_wait + * after the test as long as we do it before dropping + * the spinlock. + */ + prepare_to_wait(&bitmap->overflow_wait, &__wait, + TASK_UNINTERRUPTIBLE); + spin_unlock_irq(&bitmap->counts.lock); + schedule(); + finish_wait(&bitmap->overflow_wait, &__wait); + continue; + } + + switch (*bmc) { + case 0: + bitmap_file_set_bit(bitmap, offset); + bitmap_count_page(&bitmap->counts, offset, 1); + /* fall through */ + case 1: + *bmc = 2; + } + + (*bmc)++; + + spin_unlock_irq(&bitmap->counts.lock); + + offset += blocks; + if (sectors > blocks) + sectors -= blocks; + else + sectors = 0; + } + return 0; + } + EXPORT_SYMBOL(bitmap_startwrite); + + void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors, + int success, int behind) + { + if (!bitmap) + return; + if (behind) { + if (atomic_dec_and_test(&bitmap->behind_writes)) + wake_up(&bitmap->behind_wait); + pr_debug("dec write-behind count %d/%lu\n", + atomic_read(&bitmap->behind_writes), + bitmap->mddev->bitmap_info.max_write_behind); + } + + while (sectors) { + sector_t blocks; + unsigned long flags; + bitmap_counter_t *bmc; + + spin_lock_irqsave(&bitmap->counts.lock, flags); + bmc = bitmap_get_counter(&bitmap->counts, offset, &blocks, 0); + if (!bmc) { + spin_unlock_irqrestore(&bitmap->counts.lock, flags); + return; + } + + if (success && !bitmap->mddev->degraded && + bitmap->events_cleared < bitmap->mddev->events) { + bitmap->events_cleared = bitmap->mddev->events; + bitmap->need_sync = 1; + sysfs_notify_dirent_safe(bitmap->sysfs_can_clear); + } + + if (!success && !NEEDED(*bmc)) + *bmc |= NEEDED_MASK; + + if (COUNTER(*bmc) == COUNTER_MAX) + wake_up(&bitmap->overflow_wait); + + (*bmc)--; + if (*bmc <= 2) { + bitmap_set_pending(&bitmap->counts, offset); + bitmap->allclean = 0; + } + spin_unlock_irqrestore(&bitmap->counts.lock, flags); + offset += blocks; + if (sectors > blocks) + sectors -= blocks; + else + sectors = 0; + } + } + EXPORT_SYMBOL(bitmap_endwrite); + + static int __bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, + int degraded) + { + bitmap_counter_t *bmc; + int rv; + if (bitmap == NULL) {/* FIXME or bitmap set as 'failed' */ + *blocks = 1024; + return 1; /* always resync if no bitmap */ + } + spin_lock_irq(&bitmap->counts.lock); + bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); + rv = 0; + if (bmc) { + /* locked */ + if (RESYNC(*bmc)) + rv = 1; + else if (NEEDED(*bmc)) { + rv = 1; + if (!degraded) { /* don't set/clear bits if degraded */ + *bmc |= RESYNC_MASK; + *bmc &= ~NEEDED_MASK; + } + } + } + spin_unlock_irq(&bitmap->counts.lock); + return rv; + } + + int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, + int degraded) + { + /* bitmap_start_sync must always report on multiples of whole + * pages, otherwise resync (which is very PAGE_SIZE based) will + * get confused. + * So call __bitmap_start_sync repeatedly (if needed) until + * At least PAGE_SIZE>>9 blocks are covered. + * Return the 'or' of the result. + */ + int rv = 0; + sector_t blocks1; + + *blocks = 0; + while (*blocks < (PAGE_SIZE>>9)) { + rv |= __bitmap_start_sync(bitmap, offset, + &blocks1, degraded); + offset += blocks1; + *blocks += blocks1; + } + return rv; + } + EXPORT_SYMBOL(bitmap_start_sync); + + void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted) + { + bitmap_counter_t *bmc; + unsigned long flags; + + if (bitmap == NULL) { + *blocks = 1024; + return; + } + spin_lock_irqsave(&bitmap->counts.lock, flags); + bmc = bitmap_get_counter(&bitmap->counts, offset, blocks, 0); + if (bmc == NULL) + goto unlock; + /* locked */ + if (RESYNC(*bmc)) { + *bmc &= ~RESYNC_MASK; + + if (!NEEDED(*bmc) && aborted) + *bmc |= NEEDED_MASK; + else { + if (*bmc <= 2) { + bitmap_set_pending(&bitmap->counts, offset); + bitmap->allclean = 0; + } + } + } + unlock: + spin_unlock_irqrestore(&bitmap->counts.lock, flags); + } + EXPORT_SYMBOL(bitmap_end_sync); + + void bitmap_close_sync(struct bitmap *bitmap) + { + /* Sync has finished, and any bitmap chunks that weren't synced + * properly have been aborted. It remains to us to clear the + * RESYNC bit wherever it is still on + */ + sector_t sector = 0; + sector_t blocks; + if (!bitmap) + return; + while (sector < bitmap->mddev->resync_max_sectors) { + bitmap_end_sync(bitmap, sector, &blocks, 0); + sector += blocks; + } + } + EXPORT_SYMBOL(bitmap_close_sync); + + void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force) + { + sector_t s = 0; + sector_t blocks; + + if (!bitmap) + return; + if (sector == 0) { + bitmap->last_end_sync = jiffies; + return; + } + if (!force && time_before(jiffies, (bitmap->last_end_sync + + bitmap->mddev->bitmap_info.daemon_sleep))) + return; + wait_event(bitmap->mddev->recovery_wait, + atomic_read(&bitmap->mddev->recovery_active) == 0); + + bitmap->mddev->curr_resync_completed = sector; + set_bit(MD_SB_CHANGE_CLEAN, &bitmap->mddev->sb_flags); + sector &= ~((1ULL << bitmap->counts.chunkshift) - 1); + s = 0; + while (s < sector && s < bitmap->mddev->resync_max_sectors) { + bitmap_end_sync(bitmap, s, &blocks, 0); + s += blocks; + } + bitmap->last_end_sync = jiffies; + sysfs_notify(&bitmap->mddev->kobj, NULL, "sync_completed"); + } + EXPORT_SYMBOL(bitmap_cond_end_sync); + + void bitmap_sync_with_cluster(struct mddev *mddev, + sector_t old_lo, sector_t old_hi, + sector_t new_lo, sector_t new_hi) + { + struct bitmap *bitmap = mddev->bitmap; + sector_t sector, blocks = 0; + + for (sector = old_lo; sector < new_lo; ) { + bitmap_end_sync(bitmap, sector, &blocks, 0); + sector += blocks; + } + WARN((blocks > new_lo) && old_lo, "alignment is not correct for lo\n"); + + for (sector = old_hi; sector < new_hi; ) { + bitmap_start_sync(bitmap, sector, &blocks, 0); + sector += blocks; + } + WARN((blocks > new_hi) && old_hi, "alignment is not correct for hi\n"); + } + EXPORT_SYMBOL(bitmap_sync_with_cluster); + + static void bitmap_set_memory_bits(struct bitmap *bitmap, sector_t offset, int needed) + { + /* For each chunk covered by any of these sectors, set the + * counter to 2 and possibly set resync_needed. They should all + * be 0 at this point + */ + + sector_t secs; + bitmap_counter_t *bmc; + spin_lock_irq(&bitmap->counts.lock); + bmc = bitmap_get_counter(&bitmap->counts, offset, &secs, 1); + if (!bmc) { + spin_unlock_irq(&bitmap->counts.lock); + return; + } + if (!*bmc) { + *bmc = 2; + bitmap_count_page(&bitmap->counts, offset, 1); + bitmap_set_pending(&bitmap->counts, offset); + bitmap->allclean = 0; + } + if (needed) + *bmc |= NEEDED_MASK; + spin_unlock_irq(&bitmap->counts.lock); + } + + /* dirty the memory and file bits for bitmap chunks "s" to "e" */ + void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e) + { + unsigned long chunk; + + for (chunk = s; chunk <= e; chunk++) { + sector_t sec = (sector_t)chunk << bitmap->counts.chunkshift; + bitmap_set_memory_bits(bitmap, sec, 1); + bitmap_file_set_bit(bitmap, sec); + if (sec < bitmap->mddev->recovery_cp) + /* We are asserting that the array is dirty, + * so move the recovery_cp address back so + * that it is obvious that it is dirty + */ + bitmap->mddev->recovery_cp = sec; + } + } + + /* + * flush out any pending updates + */ + void bitmap_flush(struct mddev *mddev) + { + struct bitmap *bitmap = mddev->bitmap; + long sleep; + + if (!bitmap) /* there was no bitmap */ + return; + + /* run the daemon_work three time to ensure everything is flushed + * that can be + */ + sleep = mddev->bitmap_info.daemon_sleep * 2; + bitmap->daemon_lastrun -= sleep; + bitmap_daemon_work(mddev); + bitmap->daemon_lastrun -= sleep; + bitmap_daemon_work(mddev); + bitmap->daemon_lastrun -= sleep; + bitmap_daemon_work(mddev); + bitmap_update_sb(bitmap); + } + + /* + * free memory that was allocated + */ + void bitmap_free(struct bitmap *bitmap) + { + unsigned long k, pages; + struct bitmap_page *bp; + + if (!bitmap) /* there was no bitmap */ + return; + + if (bitmap->sysfs_can_clear) + sysfs_put(bitmap->sysfs_can_clear); + + if (mddev_is_clustered(bitmap->mddev) && bitmap->mddev->cluster_info && + bitmap->cluster_slot == md_cluster_ops->slot_number(bitmap->mddev)) + md_cluster_stop(bitmap->mddev); + + /* Shouldn't be needed - but just in case.... */ + wait_event(bitmap->write_wait, + atomic_read(&bitmap->pending_writes) == 0); + + /* release the bitmap file */ + bitmap_file_unmap(&bitmap->storage); + + bp = bitmap->counts.bp; + pages = bitmap->counts.pages; + + /* free all allocated memory */ + + if (bp) /* deallocate the page memory */ + for (k = 0; k < pages; k++) + if (bp[k].map && !bp[k].hijacked) + kfree(bp[k].map); + kfree(bp); + kfree(bitmap); + } + EXPORT_SYMBOL(bitmap_free); + + void bitmap_wait_behind_writes(struct mddev *mddev) + { + struct bitmap *bitmap = mddev->bitmap; + + /* wait for behind writes to complete */ + if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { + pr_debug("md:%s: behind writes in progress - waiting to stop.\n", + mdname(mddev)); + /* need to kick something here to make sure I/O goes? */ + wait_event(bitmap->behind_wait, + atomic_read(&bitmap->behind_writes) == 0); + } + } + + void bitmap_destroy(struct mddev *mddev) + { + struct bitmap *bitmap = mddev->bitmap; + + if (!bitmap) /* there was no bitmap */ + return; + + bitmap_wait_behind_writes(mddev); + + mutex_lock(&mddev->bitmap_info.mutex); + spin_lock(&mddev->lock); + mddev->bitmap = NULL; /* disconnect from the md device */ + spin_unlock(&mddev->lock); + mutex_unlock(&mddev->bitmap_info.mutex); + if (mddev->thread) + mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; + + bitmap_free(bitmap); + } + + /* + * initialize the bitmap structure + * if this returns an error, bitmap_destroy must be called to do clean up + * once mddev->bitmap is set + */ + struct bitmap *bitmap_create(struct mddev *mddev, int slot) + { + struct bitmap *bitmap; + sector_t blocks = mddev->resync_max_sectors; + struct file *file = mddev->bitmap_info.file; + int err; + struct kernfs_node *bm = NULL; + + BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); + + BUG_ON(file && mddev->bitmap_info.offset); + + if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { + pr_notice("md/raid:%s: array with journal cannot have bitmap\n", + mdname(mddev)); + return ERR_PTR(-EBUSY); + } + + bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); + if (!bitmap) + return ERR_PTR(-ENOMEM); + + spin_lock_init(&bitmap->counts.lock); + atomic_set(&bitmap->pending_writes, 0); + init_waitqueue_head(&bitmap->write_wait); + init_waitqueue_head(&bitmap->overflow_wait); + init_waitqueue_head(&bitmap->behind_wait); + + bitmap->mddev = mddev; + bitmap->cluster_slot = slot; + + if (mddev->kobj.sd) + bm = sysfs_get_dirent(mddev->kobj.sd, "bitmap"); + if (bm) { + bitmap->sysfs_can_clear = sysfs_get_dirent(bm, "can_clear"); + sysfs_put(bm); + } else + bitmap->sysfs_can_clear = NULL; + + bitmap->storage.file = file; + if (file) { + get_file(file); + /* As future accesses to this file will use bmap, + * and bypass the page cache, we must sync the file + * first. + */ + vfs_fsync(file, 1); + } + /* read superblock from bitmap file (this sets mddev->bitmap_info.chunksize) */ + if (!mddev->bitmap_info.external) { + /* + * If 'MD_ARRAY_FIRST_USE' is set, then device-mapper is + * instructing us to create a new on-disk bitmap instance. + */ + if (test_and_clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags)) + err = bitmap_new_disk_sb(bitmap); + else + err = bitmap_read_sb(bitmap); + } else { + err = 0; + if (mddev->bitmap_info.chunksize == 0 || + mddev->bitmap_info.daemon_sleep == 0) + /* chunksize and time_base need to be + * set first. */ + err = -EINVAL; + } + if (err) + goto error; + + bitmap->daemon_lastrun = jiffies; + err = bitmap_resize(bitmap, blocks, mddev->bitmap_info.chunksize, 1); + if (err) + goto error; + + pr_debug("created bitmap (%lu pages) for device %s\n", + bitmap->counts.pages, bmname(bitmap)); + + err = test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0; + if (err) + goto error; + + return bitmap; + error: + bitmap_free(bitmap); + return ERR_PTR(err); + } + + int bitmap_load(struct mddev *mddev) + { + int err = 0; + sector_t start = 0; + sector_t sector = 0; + struct bitmap *bitmap = mddev->bitmap; + + if (!bitmap) + goto out; + + if (mddev_is_clustered(mddev)) + md_cluster_ops->load_bitmaps(mddev, mddev->bitmap_info.nodes); + + /* Clear out old bitmap info first: Either there is none, or we + * are resuming after someone else has possibly changed things, + * so we should forget old cached info. + * All chunks should be clean, but some might need_sync. + */ + while (sector < mddev->resync_max_sectors) { + sector_t blocks; + bitmap_start_sync(bitmap, sector, &blocks, 0); + sector += blocks; + } + bitmap_close_sync(bitmap); + + if (mddev->degraded == 0 + || bitmap->events_cleared == mddev->events) + /* no need to keep dirty bits to optimise a + * re-add of a missing device */ + start = mddev->recovery_cp; + + mutex_lock(&mddev->bitmap_info.mutex); + err = bitmap_init_from_disk(bitmap, start); + mutex_unlock(&mddev->bitmap_info.mutex); + + if (err) + goto out; + clear_bit(BITMAP_STALE, &bitmap->flags); + + /* Kick recovery in case any bits were set */ + set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); + + mddev->thread->timeout = mddev->bitmap_info.daemon_sleep; + md_wakeup_thread(mddev->thread); + + bitmap_update_sb(bitmap); + + if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags)) + err = -EIO; + out: + return err; + } + EXPORT_SYMBOL_GPL(bitmap_load); + + struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot) + { + int rv = 0; + struct bitmap *bitmap; + + bitmap = bitmap_create(mddev, slot); + if (IS_ERR(bitmap)) { + rv = PTR_ERR(bitmap); + return ERR_PTR(rv); + } + + rv = bitmap_init_from_disk(bitmap, 0); + if (rv) { + bitmap_free(bitmap); + return ERR_PTR(rv); + } + + return bitmap; + } + EXPORT_SYMBOL(get_bitmap_from_slot); + + /* Loads the bitmap associated with slot and copies the resync information + * to our bitmap + */ + int bitmap_copy_from_slot(struct mddev *mddev, int slot, + sector_t *low, sector_t *high, bool clear_bits) + { + int rv = 0, i, j; + sector_t block, lo = 0, hi = 0; + struct bitmap_counts *counts; + struct bitmap *bitmap; + + bitmap = get_bitmap_from_slot(mddev, slot); + if (IS_ERR(bitmap)) { + pr_err("%s can't get bitmap from slot %d\n", __func__, slot); + return -1; + } + + counts = &bitmap->counts; + for (j = 0; j < counts->chunks; j++) { + block = (sector_t)j << counts->chunkshift; + if (bitmap_file_test_bit(bitmap, block)) { + if (!lo) + lo = block; + hi = block; + bitmap_file_clear_bit(bitmap, block); + bitmap_set_memory_bits(mddev->bitmap, block, 1); + bitmap_file_set_bit(mddev->bitmap, block); + } + } + + if (clear_bits) { + bitmap_update_sb(bitmap); + /* BITMAP_PAGE_PENDING is set, but bitmap_unplug needs + * BITMAP_PAGE_DIRTY or _NEEDWRITE to write ... */ + for (i = 0; i < bitmap->storage.file_pages; i++) + if (test_page_attr(bitmap, i, BITMAP_PAGE_PENDING)) + set_page_attr(bitmap, i, BITMAP_PAGE_NEEDWRITE); + bitmap_unplug(bitmap); + } + bitmap_unplug(mddev->bitmap); + *low = lo; + *high = hi; + + return rv; + } + EXPORT_SYMBOL_GPL(bitmap_copy_from_slot); + + + void bitmap_status(struct seq_file *seq, struct bitmap *bitmap) + { + unsigned long chunk_kb; + struct bitmap_counts *counts; + + if (!bitmap) + return; + + counts = &bitmap->counts; + + chunk_kb = bitmap->mddev->bitmap_info.chunksize >> 10; + seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " + "%lu%s chunk", + counts->pages - counts->missing_pages, + counts->pages, + (counts->pages - counts->missing_pages) + << (PAGE_SHIFT - 10), + chunk_kb ? chunk_kb : bitmap->mddev->bitmap_info.chunksize, + chunk_kb ? "KB" : "B"); + if (bitmap->storage.file) { + seq_printf(seq, ", file: "); + seq_file_path(seq, bitmap->storage.file, " \t\n"); + } + + seq_printf(seq, "\n"); + } + + int bitmap_resize(struct bitmap *bitmap, sector_t blocks, + int chunksize, int init) + { + /* If chunk_size is 0, choose an appropriate chunk size. + * Then possibly allocate new storage space. + * Then quiesce, copy bits, replace bitmap, and re-start + * + * This function is called both to set up the initial bitmap + * and to resize the bitmap while the array is active. + * If this happens as a result of the array being resized, + * chunksize will be zero, and we need to choose a suitable + * chunksize, otherwise we use what we are given. + */ + struct bitmap_storage store; + struct bitmap_counts old_counts; + unsigned long chunks; + sector_t block; + sector_t old_blocks, new_blocks; + int chunkshift; + int ret = 0; + long pages; + struct bitmap_page *new_bp; + + if (bitmap->storage.file && !init) { + pr_info("md: cannot resize file-based bitmap\n"); + return -EINVAL; + } + + if (chunksize == 0) { + /* If there is enough space, leave the chunk size unchanged, + * else increase by factor of two until there is enough space. + */ + long bytes; + long space = bitmap->mddev->bitmap_info.space; + + if (space == 0) { + /* We don't know how much space there is, so limit + * to current size - in sectors. + */ + bytes = DIV_ROUND_UP(bitmap->counts.chunks, 8); + if (!bitmap->mddev->bitmap_info.external) + bytes += sizeof(bitmap_super_t); + space = DIV_ROUND_UP(bytes, 512); + bitmap->mddev->bitmap_info.space = space; + } + chunkshift = bitmap->counts.chunkshift; + chunkshift--; + do { + /* 'chunkshift' is shift from block size to chunk size */ + chunkshift++; + chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); + bytes = DIV_ROUND_UP(chunks, 8); + if (!bitmap->mddev->bitmap_info.external) + bytes += sizeof(bitmap_super_t); + } while (bytes > (space << 9)); + } else + chunkshift = ffz(~chunksize) - BITMAP_BLOCK_SHIFT; + + chunks = DIV_ROUND_UP_SECTOR_T(blocks, 1 << chunkshift); + memset(&store, 0, sizeof(store)); + if (bitmap->mddev->bitmap_info.offset || bitmap->mddev->bitmap_info.file) + ret = bitmap_storage_alloc(&store, chunks, + !bitmap->mddev->bitmap_info.external, + mddev_is_clustered(bitmap->mddev) + ? bitmap->cluster_slot : 0); + if (ret) { + bitmap_file_unmap(&store); + goto err; + } + + pages = DIV_ROUND_UP(chunks, PAGE_COUNTER_RATIO); + + new_bp = kzalloc(pages * sizeof(*new_bp), GFP_KERNEL); + ret = -ENOMEM; + if (!new_bp) { + bitmap_file_unmap(&store); + goto err; + } + + if (!init) + bitmap->mddev->pers->quiesce(bitmap->mddev, 1); + + store.file = bitmap->storage.file; + bitmap->storage.file = NULL; + + if (store.sb_page && bitmap->storage.sb_page) + memcpy(page_address(store.sb_page), + page_address(bitmap->storage.sb_page), + sizeof(bitmap_super_t)); + bitmap_file_unmap(&bitmap->storage); + bitmap->storage = store; + + old_counts = bitmap->counts; + bitmap->counts.bp = new_bp; + bitmap->counts.pages = pages; + bitmap->counts.missing_pages = pages; + bitmap->counts.chunkshift = chunkshift; + bitmap->counts.chunks = chunks; + bitmap->mddev->bitmap_info.chunksize = 1 << (chunkshift + + BITMAP_BLOCK_SHIFT); + + blocks = min(old_counts.chunks << old_counts.chunkshift, + chunks << chunkshift); + + spin_lock_irq(&bitmap->counts.lock); + /* For cluster raid, need to pre-allocate bitmap */ + if (mddev_is_clustered(bitmap->mddev)) { + unsigned long page; + for (page = 0; page < pages; page++) { + ret = bitmap_checkpage(&bitmap->counts, page, 1, 1); + if (ret) { + unsigned long k; + + /* deallocate the page memory */ + for (k = 0; k < page; k++) { + kfree(new_bp[k].map); + } + kfree(new_bp); + + /* restore some fields from old_counts */ + bitmap->counts.bp = old_counts.bp; + bitmap->counts.pages = old_counts.pages; + bitmap->counts.missing_pages = old_counts.pages; + bitmap->counts.chunkshift = old_counts.chunkshift; + bitmap->counts.chunks = old_counts.chunks; + bitmap->mddev->bitmap_info.chunksize = 1 << (old_counts.chunkshift + + BITMAP_BLOCK_SHIFT); + blocks = old_counts.chunks << old_counts.chunkshift; + pr_warn("Could not pre-allocate in-memory bitmap for cluster raid\n"); + break; + } else + bitmap->counts.bp[page].count += 1; + } + } + + for (block = 0; block < blocks; ) { + bitmap_counter_t *bmc_old, *bmc_new; + int set; + + bmc_old = bitmap_get_counter(&old_counts, block, + &old_blocks, 0); + set = bmc_old && NEEDED(*bmc_old); + + if (set) { + bmc_new = bitmap_get_counter(&bitmap->counts, block, + &new_blocks, 1); + if (*bmc_new == 0) { + /* need to set on-disk bits too. */ + sector_t end = block + new_blocks; + sector_t start = block >> chunkshift; + start <<= chunkshift; + while (start < end) { + bitmap_file_set_bit(bitmap, block); + start += 1 << chunkshift; + } + *bmc_new = 2; + bitmap_count_page(&bitmap->counts, + block, 1); + bitmap_set_pending(&bitmap->counts, + block); + } + *bmc_new |= NEEDED_MASK; + if (new_blocks < old_blocks) + old_blocks = new_blocks; + } + block += old_blocks; + } + + if (bitmap->counts.bp != old_counts.bp) { + unsigned long k; + for (k = 0; k < old_counts.pages; k++) + if (!old_counts.bp[k].hijacked) + kfree(old_counts.bp[k].map); + kfree(old_counts.bp); + } + + if (!init) { + int i; + while (block < (chunks << chunkshift)) { + bitmap_counter_t *bmc; + bmc = bitmap_get_counter(&bitmap->counts, block, + &new_blocks, 1); + if (bmc) { + /* new space. It needs to be resynced, so + * we set NEEDED_MASK. + */ + if (*bmc == 0) { + *bmc = NEEDED_MASK | 2; + bitmap_count_page(&bitmap->counts, + block, 1); + bitmap_set_pending(&bitmap->counts, + block); + } + } + block += new_blocks; + } + for (i = 0; i < bitmap->storage.file_pages; i++) + set_page_attr(bitmap, i, BITMAP_PAGE_DIRTY); + } + spin_unlock_irq(&bitmap->counts.lock); + + if (!init) { + bitmap_unplug(bitmap); + bitmap->mddev->pers->quiesce(bitmap->mddev, 0); + } + ret = 0; + err: + return ret; + } + EXPORT_SYMBOL_GPL(bitmap_resize); + + static ssize_t + location_show(struct mddev *mddev, char *page) + { + ssize_t len; + if (mddev->bitmap_info.file) + len = sprintf(page, "file"); + else if (mddev->bitmap_info.offset) + len = sprintf(page, "%+lld", (long long)mddev->bitmap_info.offset); + else + len = sprintf(page, "none"); + len += sprintf(page+len, "\n"); + return len; + } + + static ssize_t + location_store(struct mddev *mddev, const char *buf, size_t len) + { + int rv; + + rv = mddev_lock(mddev); + if (rv) + return rv; + if (mddev->pers) { + if (!mddev->pers->quiesce) { + rv = -EBUSY; + goto out; + } + if (mddev->recovery || mddev->sync_thread) { + rv = -EBUSY; + goto out; + } + } + + if (mddev->bitmap || mddev->bitmap_info.file || + mddev->bitmap_info.offset) { + /* bitmap already configured. Only option is to clear it */ + if (strncmp(buf, "none", 4) != 0) { + rv = -EBUSY; + goto out; + } + if (mddev->pers) { + mddev->pers->quiesce(mddev, 1); + bitmap_destroy(mddev); + mddev->pers->quiesce(mddev, 0); + } + mddev->bitmap_info.offset = 0; + if (mddev->bitmap_info.file) { + struct file *f = mddev->bitmap_info.file; + mddev->bitmap_info.file = NULL; + fput(f); + } + } else { + /* No bitmap, OK to set a location */ + long long offset; + if (strncmp(buf, "none", 4) == 0) + /* nothing to be done */; + else if (strncmp(buf, "file:", 5) == 0) { + /* Not supported yet */ + rv = -EINVAL; + goto out; + } else { + if (buf[0] == '+') + rv = kstrtoll(buf+1, 10, &offset); + else + rv = kstrtoll(buf, 10, &offset); + if (rv) + goto out; + if (offset == 0) { + rv = -EINVAL; + goto out; + } + if (mddev->bitmap_info.external == 0 && + mddev->major_version == 0 && + offset != mddev->bitmap_info.default_offset) { + rv = -EINVAL; + goto out; + } + mddev->bitmap_info.offset = offset; + if (mddev->pers) { + struct bitmap *bitmap; + mddev->pers->quiesce(mddev, 1); + bitmap = bitmap_create(mddev, -1); + if (IS_ERR(bitmap)) + rv = PTR_ERR(bitmap); + else { + mddev->bitmap = bitmap; + rv = bitmap_load(mddev); + if (rv) + mddev->bitmap_info.offset = 0; + } + mddev->pers->quiesce(mddev, 0); + if (rv) { + bitmap_destroy(mddev); + goto out; + } + } + } + } + if (!mddev->external) { + /* Ensure new bitmap info is stored in + * metadata promptly. + */ + set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags); + md_wakeup_thread(mddev->thread); + } + rv = 0; + out: + mddev_unlock(mddev); + if (rv) + return rv; + return len; + } + + static struct md_sysfs_entry bitmap_location = + __ATTR(location, S_IRUGO|S_IWUSR, location_show, location_store); + + /* 'bitmap/space' is the space available at 'location' for the + * bitmap. This allows the kernel to know when it is safe to + * resize the bitmap to match a resized array. + */ + static ssize_t + space_show(struct mddev *mddev, char *page) + { + return sprintf(page, "%lu\n", mddev->bitmap_info.space); + } + + static ssize_t + space_store(struct mddev *mddev, const char *buf, size_t len) + { + unsigned long sectors; + int rv; + + rv = kstrtoul(buf, 10, §ors); + if (rv) + return rv; + + if (sectors == 0) + return -EINVAL; + + if (mddev->bitmap && + sectors < (mddev->bitmap->storage.bytes + 511) >> 9) + return -EFBIG; /* Bitmap is too big for this small space */ + + /* could make sure it isn't too big, but that isn't really + * needed - user-space should be careful. + */ + mddev->bitmap_info.space = sectors; + return len; + } + + static struct md_sysfs_entry bitmap_space = + __ATTR(space, S_IRUGO|S_IWUSR, space_show, space_store); + + static ssize_t + timeout_show(struct mddev *mddev, char *page) + { + ssize_t len; + unsigned long secs = mddev->bitmap_info.daemon_sleep / HZ; + unsigned long jifs = mddev->bitmap_info.daemon_sleep % HZ; + + len = sprintf(page, "%lu", secs); + if (jifs) + len += sprintf(page+len, ".%03u", jiffies_to_msecs(jifs)); + len += sprintf(page+len, "\n"); + return len; + } + + static ssize_t + timeout_store(struct mddev *mddev, const char *buf, size_t len) + { + /* timeout can be set at any time */ + unsigned long timeout; + int rv = strict_strtoul_scaled(buf, &timeout, 4); + if (rv) + return rv; + + /* just to make sure we don't overflow... */ + if (timeout >= LONG_MAX / HZ) + return -EINVAL; + + timeout = timeout * HZ / 10000; + + if (timeout >= MAX_SCHEDULE_TIMEOUT) + timeout = MAX_SCHEDULE_TIMEOUT-1; + if (timeout < 1) + timeout = 1; + mddev->bitmap_info.daemon_sleep = timeout; + if (mddev->thread) { + /* if thread->timeout is MAX_SCHEDULE_TIMEOUT, then + * the bitmap is all clean and we don't need to + * adjust the timeout right now + */ + if (mddev->thread->timeout < MAX_SCHEDULE_TIMEOUT) { + mddev->thread->timeout = timeout; + md_wakeup_thread(mddev->thread); + } + } + return len; + } + + static struct md_sysfs_entry bitmap_timeout = + __ATTR(time_base, S_IRUGO|S_IWUSR, timeout_show, timeout_store); + + static ssize_t + backlog_show(struct mddev *mddev, char *page) + { + return sprintf(page, "%lu\n", mddev->bitmap_info.max_write_behind); + } + + static ssize_t + backlog_store(struct mddev *mddev, const char *buf, size_t len) + { + unsigned long backlog; + int rv = kstrtoul(buf, 10, &backlog); + if (rv) + return rv; + if (backlog > COUNTER_MAX) + return -EINVAL; + mddev->bitmap_info.max_write_behind = backlog; + return len; + } + + static struct md_sysfs_entry bitmap_backlog = + __ATTR(backlog, S_IRUGO|S_IWUSR, backlog_show, backlog_store); + + static ssize_t + chunksize_show(struct mddev *mddev, char *page) + { + return sprintf(page, "%lu\n", mddev->bitmap_info.chunksize); + } + + static ssize_t + chunksize_store(struct mddev *mddev, const char *buf, size_t len) + { + /* Can only be changed when no bitmap is active */ + int rv; + unsigned long csize; + if (mddev->bitmap) + return -EBUSY; + rv = kstrtoul(buf, 10, &csize); + if (rv) + return rv; + if (csize < 512 || + !is_power_of_2(csize)) + return -EINVAL; + mddev->bitmap_info.chunksize = csize; + return len; + } + + static struct md_sysfs_entry bitmap_chunksize = + __ATTR(chunksize, S_IRUGO|S_IWUSR, chunksize_show, chunksize_store); + + static ssize_t metadata_show(struct mddev *mddev, char *page) + { + if (mddev_is_clustered(mddev)) + return sprintf(page, "clustered\n"); + return sprintf(page, "%s\n", (mddev->bitmap_info.external + ? "external" : "internal")); + } + + static ssize_t metadata_store(struct mddev *mddev, const char *buf, size_t len) + { + if (mddev->bitmap || + mddev->bitmap_info.file || + mddev->bitmap_info.offset) + return -EBUSY; + if (strncmp(buf, "external", 8) == 0) + mddev->bitmap_info.external = 1; + else if ((strncmp(buf, "internal", 8) == 0) || + (strncmp(buf, "clustered", 9) == 0)) + mddev->bitmap_info.external = 0; + else + return -EINVAL; + return len; + } + + static struct md_sysfs_entry bitmap_metadata = + __ATTR(metadata, S_IRUGO|S_IWUSR, metadata_show, metadata_store); + + static ssize_t can_clear_show(struct mddev *mddev, char *page) + { + int len; + spin_lock(&mddev->lock); + if (mddev->bitmap) + len = sprintf(page, "%s\n", (mddev->bitmap->need_sync ? + "false" : "true")); + else + len = sprintf(page, "\n"); + spin_unlock(&mddev->lock); + return len; + } + + static ssize_t can_clear_store(struct mddev *mddev, const char *buf, size_t len) + { + if (mddev->bitmap == NULL) + return -ENOENT; + if (strncmp(buf, "false", 5) == 0) + mddev->bitmap->need_sync = 1; + else if (strncmp(buf, "true", 4) == 0) { + if (mddev->degraded) + return -EBUSY; + mddev->bitmap->need_sync = 0; + } else + return -EINVAL; + return len; + } + + static struct md_sysfs_entry bitmap_can_clear = + __ATTR(can_clear, S_IRUGO|S_IWUSR, can_clear_show, can_clear_store); + + static ssize_t + behind_writes_used_show(struct mddev *mddev, char *page) + { + ssize_t ret; + spin_lock(&mddev->lock); + if (mddev->bitmap == NULL) + ret = sprintf(page, "0\n"); + else + ret = sprintf(page, "%lu\n", + mddev->bitmap->behind_writes_used); + spin_unlock(&mddev->lock); + return ret; + } + + static ssize_t + behind_writes_used_reset(struct mddev *mddev, const char *buf, size_t len) + { + if (mddev->bitmap) + mddev->bitmap->behind_writes_used = 0; + return len; + } + + static struct md_sysfs_entry max_backlog_used = + __ATTR(max_backlog_used, S_IRUGO | S_IWUSR, + behind_writes_used_show, behind_writes_used_reset); + + static struct attribute *md_bitmap_attrs[] = { + &bitmap_location.attr, + &bitmap_space.attr, + &bitmap_timeout.attr, + &bitmap_backlog.attr, + &bitmap_chunksize.attr, + &bitmap_metadata.attr, + &bitmap_can_clear.attr, + &max_backlog_used.attr, + NULL + }; + struct attribute_group md_bitmap_group = { + .name = "bitmap", + .attrs = md_bitmap_attrs, + }; + diff --cc drivers/md/md-bitmap.h index 000000000000,d15721ac07a6..5df35ca90f58 mode 000000,100644..100644 --- a/drivers/md/md-bitmap.h +++ b/drivers/md/md-bitmap.h @@@ -1,0 -1,277 +1,278 @@@ ++/* SPDX-License-Identifier: GPL-2.0 */ + /* + * bitmap.h: Copyright (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 + * + * additions: Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. + */ + #ifndef BITMAP_H + #define BITMAP_H 1 + + #define BITMAP_MAJOR_LO 3 + /* version 4 insists the bitmap is in little-endian order + * with version 3, it is host-endian which is non-portable + * Version 5 is currently set only for clustered devices + */ + #define BITMAP_MAJOR_HI 4 + #define BITMAP_MAJOR_CLUSTERED 5 + #define BITMAP_MAJOR_HOSTENDIAN 3 + + /* + * in-memory bitmap: + * + * Use 16 bit block counters to track pending writes to each "chunk". + * The 2 high order bits are special-purpose, the first is a flag indicating + * whether a resync is needed. The second is a flag indicating whether a + * resync is active. + * This means that the counter is actually 14 bits: + * + * +--------+--------+------------------------------------------------+ + * | resync | resync | counter | + * | needed | active | | + * | (0-1) | (0-1) | (0-16383) | + * +--------+--------+------------------------------------------------+ + * + * The "resync needed" bit is set when: + * a '1' bit is read from storage at startup. + * a write request fails on some drives + * a resync is aborted on a chunk with 'resync active' set + * It is cleared (and resync-active set) when a resync starts across all drives + * of the chunk. + * + * + * The "resync active" bit is set when: + * a resync is started on all drives, and resync_needed is set. + * resync_needed will be cleared (as long as resync_active wasn't already set). + * It is cleared when a resync completes. + * + * The counter counts pending write requests, plus the on-disk bit. + * When the counter is '1' and the resync bits are clear, the on-disk + * bit can be cleared as well, thus setting the counter to 0. + * When we set a bit, or in the counter (to start a write), if the fields is + * 0, we first set the disk bit and set the counter to 1. + * + * If the counter is 0, the on-disk bit is clear and the stripe is clean + * Anything that dirties the stripe pushes the counter to 2 (at least) + * and sets the on-disk bit (lazily). + * If a periodic sweep find the counter at 2, it is decremented to 1. + * If the sweep find the counter at 1, the on-disk bit is cleared and the + * counter goes to zero. + * + * Also, we'll hijack the "map" pointer itself and use it as two 16 bit block + * counters as a fallback when "page" memory cannot be allocated: + * + * Normal case (page memory allocated): + * + * page pointer (32-bit) + * + * [ ] ------+ + * | + * +-------> [ ][ ]..[ ] (4096 byte page == 2048 counters) + * c1 c2 c2048 + * + * Hijacked case (page memory allocation failed): + * + * hijacked page pointer (32-bit) + * + * [ ][ ] (no page memory allocated) + * counter #1 (16-bit) counter #2 (16-bit) + * + */ + + #ifdef __KERNEL__ + + #define PAGE_BITS (PAGE_SIZE << 3) + #define PAGE_BIT_SHIFT (PAGE_SHIFT + 3) + + typedef __u16 bitmap_counter_t; + #define COUNTER_BITS 16 + #define COUNTER_BIT_SHIFT 4 + #define COUNTER_BYTE_SHIFT (COUNTER_BIT_SHIFT - 3) + + #define NEEDED_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 1))) + #define RESYNC_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 2))) + #define COUNTER_MAX ((bitmap_counter_t) RESYNC_MASK - 1) + #define NEEDED(x) (((bitmap_counter_t) x) & NEEDED_MASK) + #define RESYNC(x) (((bitmap_counter_t) x) & RESYNC_MASK) + #define COUNTER(x) (((bitmap_counter_t) x) & COUNTER_MAX) + + /* how many counters per page? */ + #define PAGE_COUNTER_RATIO (PAGE_BITS / COUNTER_BITS) + /* same, except a shift value for more efficient bitops */ + #define PAGE_COUNTER_SHIFT (PAGE_BIT_SHIFT - COUNTER_BIT_SHIFT) + /* same, except a mask value for more efficient bitops */ + #define PAGE_COUNTER_MASK (PAGE_COUNTER_RATIO - 1) + + #define BITMAP_BLOCK_SHIFT 9 + + #endif + + /* + * bitmap structures: + */ + + #define BITMAP_MAGIC 0x6d746962 + + /* use these for bitmap->flags and bitmap->sb->state bit-fields */ + enum bitmap_state { + BITMAP_STALE = 1, /* the bitmap file is out of date or had -EIO */ + BITMAP_WRITE_ERROR = 2, /* A write error has occurred */ + BITMAP_HOSTENDIAN =15, + }; + + /* the superblock at the front of the bitmap file -- little endian */ + typedef struct bitmap_super_s { + __le32 magic; /* 0 BITMAP_MAGIC */ + __le32 version; /* 4 the bitmap major for now, could change... */ + __u8 uuid[16]; /* 8 128 bit uuid - must match md device uuid */ + __le64 events; /* 24 event counter for the bitmap (1)*/ + __le64 events_cleared;/*32 event counter when last bit cleared (2) */ + __le64 sync_size; /* 40 the size of the md device's sync range(3) */ + __le32 state; /* 48 bitmap state information */ + __le32 chunksize; /* 52 the bitmap chunk size in bytes */ + __le32 daemon_sleep; /* 56 seconds between disk flushes */ + __le32 write_behind; /* 60 number of outstanding write-behind writes */ + __le32 sectors_reserved; /* 64 number of 512-byte sectors that are + * reserved for the bitmap. */ + __le32 nodes; /* 68 the maximum number of nodes in cluster. */ + __u8 cluster_name[64]; /* 72 cluster name to which this md belongs */ + __u8 pad[256 - 136]; /* set to zero */ + } bitmap_super_t; + + /* notes: + * (1) This event counter is updated before the eventcounter in the md superblock + * When a bitmap is loaded, it is only accepted if this event counter is equal + * to, or one greater than, the event counter in the superblock. + * (2) This event counter is updated when the other one is *if*and*only*if* the + * array is not degraded. As bits are not cleared when the array is degraded, + * this represents the last time that any bits were cleared. + * If a device is being added that has an event count with this value or + * higher, it is accepted as conforming to the bitmap. + * (3)This is the number of sectors represented by the bitmap, and is the range that + * resync happens across. For raid1 and raid5/6 it is the size of individual + * devices. For raid10 it is the size of the array. + */ + + #ifdef __KERNEL__ + + /* the in-memory bitmap is represented by bitmap_pages */ + struct bitmap_page { + /* + * map points to the actual memory page + */ + char *map; + /* + * in emergencies (when map cannot be alloced), hijack the map + * pointer and use it as two counters itself + */ + unsigned int hijacked:1; + /* + * If any counter in this page is '1' or '2' - and so could be + * cleared then that page is marked as 'pending' + */ + unsigned int pending:1; + /* + * count of dirty bits on the page + */ + unsigned int count:30; + }; + + /* the main bitmap structure - one per mddev */ + struct bitmap { + + struct bitmap_counts { + spinlock_t lock; + struct bitmap_page *bp; + unsigned long pages; /* total number of pages + * in the bitmap */ + unsigned long missing_pages; /* number of pages + * not yet allocated */ + unsigned long chunkshift; /* chunksize = 2^chunkshift + * (for bitops) */ + unsigned long chunks; /* Total number of data + * chunks for the array */ + } counts; + + struct mddev *mddev; /* the md device that the bitmap is for */ + + __u64 events_cleared; + int need_sync; + + struct bitmap_storage { + struct file *file; /* backing disk file */ + struct page *sb_page; /* cached copy of the bitmap + * file superblock */ + struct page **filemap; /* list of cache pages for + * the file */ + unsigned long *filemap_attr; /* attributes associated + * w/ filemap pages */ + unsigned long file_pages; /* number of pages in the file*/ + unsigned long bytes; /* total bytes in the bitmap */ + } storage; + + unsigned long flags; + + int allclean; + + atomic_t behind_writes; + unsigned long behind_writes_used; /* highest actual value at runtime */ + + /* + * the bitmap daemon - periodically wakes up and sweeps the bitmap + * file, cleaning up bits and flushing out pages to disk as necessary + */ + unsigned long daemon_lastrun; /* jiffies of last run */ + unsigned long last_end_sync; /* when we lasted called end_sync to + * update bitmap with resync progress */ + + atomic_t pending_writes; /* pending writes to the bitmap file */ + wait_queue_head_t write_wait; + wait_queue_head_t overflow_wait; + wait_queue_head_t behind_wait; + + struct kernfs_node *sysfs_can_clear; + int cluster_slot; /* Slot offset for clustered env */ + }; + + /* the bitmap API */ + + /* these are used only by md/bitmap */ + struct bitmap *bitmap_create(struct mddev *mddev, int slot); + int bitmap_load(struct mddev *mddev); + void bitmap_flush(struct mddev *mddev); + void bitmap_destroy(struct mddev *mddev); + + void bitmap_print_sb(struct bitmap *bitmap); + void bitmap_update_sb(struct bitmap *bitmap); + void bitmap_status(struct seq_file *seq, struct bitmap *bitmap); + + int bitmap_setallbits(struct bitmap *bitmap); + void bitmap_write_all(struct bitmap *bitmap); + + void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e); + + /* these are exported */ + int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, + unsigned long sectors, int behind); + void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, + unsigned long sectors, int success, int behind); + int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int degraded); + void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted); + void bitmap_close_sync(struct bitmap *bitmap); + void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector, bool force); + void bitmap_sync_with_cluster(struct mddev *mddev, + sector_t old_lo, sector_t old_hi, + sector_t new_lo, sector_t new_hi); + + void bitmap_unplug(struct bitmap *bitmap); + void bitmap_daemon_work(struct mddev *mddev); + + int bitmap_resize(struct bitmap *bitmap, sector_t blocks, + int chunksize, int init); + struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot); + int bitmap_copy_from_slot(struct mddev *mddev, int slot, + sector_t *lo, sector_t *hi, bool clear_bits); + void bitmap_free(struct bitmap *bitmap); + void bitmap_wait_behind_writes(struct mddev *mddev); + #endif + + #endif diff --cc drivers/md/md-linear.h index 000000000000,8d392e6098b3..8381d651d4ed mode 000000,100644..100644 --- a/drivers/md/md-linear.h +++ b/drivers/md/md-linear.h @@@ -1,0 -1,16 +1,17 @@@ ++/* SPDX-License-Identifier: GPL-2.0 */ + #ifndef _LINEAR_H + #define _LINEAR_H + + struct dev_info { + struct md_rdev *rdev; + sector_t end_sector; + }; + + struct linear_conf + { + struct rcu_head rcu; + sector_t array_sectors; + int raid_disks; /* a copy of mddev->raid_disks */ + struct dev_info disks[0]; + }; + #endif diff --cc drivers/md/md-multipath.h index 000000000000,717c60f62898..0adb941f485a mode 000000,100644..100644 --- a/drivers/md/md-multipath.h +++ b/drivers/md/md-multipath.h @@@ -1,0 -1,31 +1,32 @@@ ++/* SPDX-License-Identifier: GPL-2.0 */ + #ifndef _MULTIPATH_H + #define _MULTIPATH_H + + struct multipath_info { + struct md_rdev *rdev; + }; + + struct mpconf { + struct mddev *mddev; + struct multipath_info *multipaths; + int raid_disks; + spinlock_t device_lock; + struct list_head retry_list; + + mempool_t *pool; + }; + + /* + * this is our 'private' 'collective' MULTIPATH buffer head. + * it contains information about what kind of IO operations were started + * for this MULTIPATH operation, and about their status: + */ + + struct multipath_bh { + struct mddev *mddev; + struct bio *master_bio; + struct bio bio; + int path; + struct list_head retry_list; + }; + #endif