diff options
Diffstat (limited to 'drivers/md/bitmap.c')
| -rw-r--r-- | drivers/md/bitmap.c | 41 |
1 files changed, 35 insertions, 6 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index 53e8bea295e..1742435ce3a 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -505,7 +505,7 @@ void bitmap_update_sb(struct bitmap *bitmap) return; } spin_unlock_irqrestore(&bitmap->lock, flags); - sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); + sb = kmap_atomic(bitmap->sb_page, KM_USER0); sb->events = cpu_to_le64(bitmap->mddev->events); if (bitmap->mddev->events < bitmap->events_cleared) { /* rocking back to read-only */ @@ -526,7 +526,7 @@ void bitmap_print_sb(struct bitmap *bitmap) if (!bitmap || !bitmap->sb_page) return; - sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); + sb = kmap_atomic(bitmap->sb_page, KM_USER0); printk(KERN_DEBUG "%s: bitmap file superblock:\n", bmname(bitmap)); printk(KERN_DEBUG " magic: %08x\n", le32_to_cpu(sb->magic)); printk(KERN_DEBUG " version: %d\n", le32_to_cpu(sb->version)); @@ -575,7 +575,7 @@ static int bitmap_read_sb(struct bitmap *bitmap) return err; } - sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); + sb = kmap_atomic(bitmap->sb_page, KM_USER0); chunksize = le32_to_cpu(sb->chunksize); daemon_sleep = le32_to_cpu(sb->daemon_sleep) * HZ; @@ -661,7 +661,7 @@ static int bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, return 0; } spin_unlock_irqrestore(&bitmap->lock, flags); - sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0); + sb = kmap_atomic(bitmap->sb_page, KM_USER0); old = le32_to_cpu(sb->state) & bits; switch (op) { case MASK_SET: sb->state |= cpu_to_le32(bits); @@ -1292,9 +1292,14 @@ int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sect 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; + PRINTK(KERN_DEBUG "inc write-behind count %d/%d\n", - atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); + bw, bitmap->max_write_behind); } while (sectors) { @@ -1351,7 +1356,8 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto { if (!bitmap) return; if (behind) { - atomic_dec(&bitmap->behind_writes); + if (atomic_dec_and_test(&bitmap->behind_writes)) + wake_up(&bitmap->behind_wait); PRINTK(KERN_DEBUG "dec write-behind count %d/%d\n", atomic_read(&bitmap->behind_writes), bitmap->max_write_behind); } @@ -1675,6 +1681,7 @@ int bitmap_create(mddev_t *mddev) 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; @@ -2006,6 +2013,27 @@ static ssize_t can_clear_store(mddev_t *mddev, const char *buf, size_t 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(mddev_t *mddev, char *page) +{ + if (mddev->bitmap == NULL) + return sprintf(page, "0\n"); + return sprintf(page, "%lu\n", + mddev->bitmap->behind_writes_used); +} + +static ssize_t +behind_writes_used_reset(mddev_t *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_timeout.attr, @@ -2013,6 +2041,7 @@ static struct attribute *md_bitmap_attrs[] = { &bitmap_chunksize.attr, &bitmap_metadata.attr, &bitmap_can_clear.attr, + &max_backlog_used.attr, NULL }; struct attribute_group md_bitmap_group = { |