diff options
Diffstat (limited to 'drivers/md/bitmap.c')
| -rw-r--r-- | drivers/md/bitmap.c | 136 |
1 files changed, 76 insertions, 60 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index ac688fb..c042efd 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -553,6 +553,14 @@ static int bitmap_read_sb(struct bitmap *bitmap) unsigned long long events; int err = -EINVAL; + if (!bitmap->file && !bitmap->mddev->bitmap_info.offset) { + chunksize = 128 * 1024 * 1024; + daemon_sleep = 5 * HZ; + write_behind = 0; + bitmap->flags = BITMAP_STALE; + err = 0; + goto out_no_sb; + } /* page 0 is the superblock, read it... */ if (bitmap->file) { loff_t isize = i_size_read(bitmap->file->f_mapping->host); @@ -623,18 +631,19 @@ static int bitmap_read_sb(struct bitmap *bitmap) } /* assign fields using values from superblock */ - bitmap->mddev->bitmap_info.chunksize = chunksize; - bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep; - bitmap->mddev->bitmap_info.max_write_behind = write_behind; bitmap->flags |= le32_to_cpu(sb->state); if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN) bitmap->flags |= BITMAP_HOSTENDIAN; bitmap->events_cleared = le64_to_cpu(sb->events_cleared); - if (bitmap->flags & BITMAP_STALE) - bitmap->events_cleared = bitmap->mddev->events; err = 0; out: kunmap_atomic(sb); +out_no_sb: + if (bitmap->flags & BITMAP_STALE) + 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; if (err) bitmap_print_sb(bitmap); return err; @@ -837,9 +846,6 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) void *kaddr; unsigned long chunk = block >> bitmap->chunkshift; - if (!bitmap->filemap) - return; - page = filemap_get_page(bitmap, chunk); if (!page) return; @@ -857,6 +863,29 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) set_page_attr(bitmap, page, 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->chunkshift; + + page = filemap_get_page(bitmap, chunk); + if (!page) + return; + bit = file_page_offset(bitmap, chunk); + paddr = kmap_atomic(page); + if (bitmap->flags & BITMAP_HOSTENDIAN) + clear_bit(bit, paddr); + else + __clear_bit_le(bit, paddr); + kunmap_atomic(paddr); + if (!test_page_attr(bitmap, page, BITMAP_PAGE_NEEDWRITE)) { + set_page_attr(bitmap, page, BITMAP_PAGE_PENDING); + bitmap->allclean = 0; + } +} + /* 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 */ @@ -867,7 +896,7 @@ void bitmap_unplug(struct bitmap *bitmap) struct page *page; int wait = 0; - if (!bitmap) + if (!bitmap || !bitmap->filemap) return; /* look at each page to see if there are any set bits that need to be @@ -930,7 +959,20 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) chunks = bitmap->chunks; file = bitmap->file; - BUG_ON(!file && !bitmap->mddev->bitmap_info.offset); + if (!file && !bitmap->mddev->bitmap_info.offset) { + /* No permanent bitmap - fill with '1s'. */ + bitmap->filemap = NULL; + bitmap->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->chunkshift) + >= start); + bitmap_set_memory_bits(bitmap, + (sector_t)i << bitmap->chunkshift, + needed); + } + return 0; + } outofdate = bitmap->flags & BITMAP_STALE; if (outofdate) @@ -1045,15 +1087,6 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) } } - /* everything went OK */ - ret = 0; - bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); - - if (bit_cnt) { /* Kick recovery if any bits were set */ - set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery); - md_wakeup_thread(bitmap->mddev->thread); - } - printk(KERN_INFO "%s: bitmap initialized from disk: " "read %lu/%lu pages, set %lu of %lu bits\n", bmname(bitmap), bitmap->file_pages, num_pages, bit_cnt, chunks); @@ -1073,6 +1106,12 @@ void bitmap_write_all(struct bitmap *bitmap) */ int i; + if (!bitmap || !bitmap->filemap) + return; + if (bitmap->file) + /* Only one copy, so nothing needed */ + return; + spin_lock_irq(&bitmap->lock); for (i = 0; i < bitmap->file_pages; i++) set_page_attr(bitmap, bitmap->filemap[i], @@ -1115,7 +1154,6 @@ void bitmap_daemon_work(struct mddev *mddev) unsigned long nextpage; unsigned long flags; sector_t blocks; - void *paddr; /* Use a mutex to guard daemon_work against * bitmap_destroy. @@ -1142,10 +1180,6 @@ void bitmap_daemon_work(struct mddev *mddev) * we will write it. */ spin_lock_irqsave(&bitmap->lock, flags); - if (!bitmap->filemap) - /* error or shutdown */ - goto out; - for (j = 0; j < bitmap->file_pages; j++) if (test_page_attr(bitmap, bitmap->filemap[j], BITMAP_PAGE_PENDING)) { @@ -1161,11 +1195,14 @@ void bitmap_daemon_work(struct mddev *mddev) * other changes */ bitmap_super_t *sb; bitmap->need_sync = 0; - sb = kmap_atomic(bitmap->sb_page); - sb->events_cleared = - cpu_to_le64(bitmap->events_cleared); - kunmap_atomic(sb); - set_page_attr(bitmap, bitmap->sb_page, BITMAP_PAGE_NEEDWRITE); + if (bitmap->filemap) { + sb = kmap_atomic(bitmap->sb_page); + sb->events_cleared = + cpu_to_le64(bitmap->events_cleared); + kunmap_atomic(sb); + set_page_attr(bitmap, bitmap->sb_page, + BITMAP_PAGE_NEEDWRITE); + } } /* Now look at the bitmap counters and if any are '2' or '1', * decrement and handle accordingly. @@ -1173,6 +1210,7 @@ void bitmap_daemon_work(struct mddev *mddev) nextpage = 0; for (j = 0; j < bitmap->chunks; j++) { bitmap_counter_t *bmc; + sector_t block = (sector_t)j << bitmap->chunkshift; if (j == nextpage) { nextpage += PAGE_COUNTER_RATIO; @@ -1183,7 +1221,7 @@ void bitmap_daemon_work(struct mddev *mddev) bitmap->bp[j >> PAGE_COUNTER_SHIFT].pending = 0; } bmc = bitmap_get_counter(bitmap, - (sector_t)j << bitmap->chunkshift, + block, &blocks, 0); if (!bmc) { @@ -1192,33 +1230,12 @@ void bitmap_daemon_work(struct mddev *mddev) } if (*bmc == 1 && !bitmap->need_sync) { /* We can clear the bit */ - struct page *page; *bmc = 0; - bitmap_count_page( - bitmap, - (sector_t)j << bitmap->chunkshift, - -1); - - page = filemap_get_page(bitmap, j); - paddr = kmap_atomic(page); - if (bitmap->flags & BITMAP_HOSTENDIAN) - clear_bit(file_page_offset(bitmap, j), - paddr); - else - __clear_bit_le(file_page_offset(bitmap, j), - paddr); - kunmap_atomic(paddr); - if (!test_page_attr(bitmap, page, - BITMAP_PAGE_NEEDWRITE)) { - set_page_attr(bitmap, page, - BITMAP_PAGE_PENDING); - bitmap->allclean = 0; - } + bitmap_count_page(bitmap, block, -1); + bitmap_file_clear_bit(bitmap, block); } else if (*bmc && *bmc <= 2) { *bmc = 1; - bitmap_set_pending( - bitmap, - (sector_t)j << bitmap->chunkshift); + bitmap_set_pending(bitmap, block); bitmap->allclean = 0; } } @@ -1249,7 +1266,6 @@ void bitmap_daemon_work(struct mddev *mddev) break; } } -out: spin_unlock_irqrestore(&bitmap->lock, flags); done: @@ -1551,7 +1567,7 @@ EXPORT_SYMBOL(bitmap_cond_end_sync); 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 1 and set resync_needed. They should all + * counter to 2 and possibly set resync_needed. They should all * be 0 at this point */ @@ -1678,10 +1694,6 @@ int bitmap_create(struct mddev *mddev) BUILD_BUG_ON(sizeof(bitmap_super_t) != 256); - if (!file - && !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */ - return 0; - BUG_ON(file && mddev->bitmap_info.offset); bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL); @@ -1801,6 +1813,10 @@ int bitmap_load(struct mddev *mddev) if (err) goto out; + bitmap_mask_state(bitmap, BITMAP_STALE, MASK_UNSET); + + /* 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); |