linux-master/fs/super.c

1088 	 * bdev buffer cache (eg. use a private mapping, or directories in
1091 	 * from bdev, we could get stale data, so invalidate it to give a best
1356  * Lock the superblock that is holder of the bdev. Returns the superblock
1358  * we return NULL and just unlock bdev->bd_holder_lock.
1360  * The function must be called with bdev->bd_holder_lock and releases it.
1362 static struct super_block *bdev_super_lock(struct block_device *bdev, bool excl)
1363 	__releases(&bdev->bd_holder_lock)
1365 	struct super_block *sb = bdev->bd_holder;
1368 	lockdep_assert_held(&bdev->bd_holder_lock);
1370 	lockdep_assert_not_held(&bdev->bd_disk->open_mutex);
1377 	mutex_unlock(&bdev->bd_holder_lock);
1398 static void fs_bdev_mark_dead(struct block_device *bdev, bool surprise)
1402 	sb = bdev_super_lock(bdev, false);
1416 static void fs_bdev_sync(struct block_device *bdev)
1420 	sb = bdev_super_lock(bdev, false);
1428 static struct super_block *get_bdev_super(struct block_device *bdev)
1433 	sb = bdev_super_lock(bdev, true);
1445  * @bdev: block device
1458 static int fs_bdev_freeze(struct block_device *bdev)
1463 	lockdep_assert_held(&bdev->bd_fsfreeze_mutex);
1465 	sb = get_bdev_super(bdev);
1476 		error = sync_blockdev(bdev);
1483  * @bdev: block device
1498 static int fs_bdev_thaw(struct block_device *bdev)
1503 	lockdep_assert_held(&bdev->bd_fsfreeze_mutex);
1505 	sb = get_bdev_super(bdev);
1532 	struct block_device *bdev;
1540 	bdev = file_bdev(bdev_file);
1547 	if ((mode & BLK_OPEN_WRITE) && bdev_read_only(bdev)) {
1553 	 * It is enough to check bdev was not frozen before we set
1556 	if (atomic_read(&bdev->bd_fsfreeze_count) > 0) {
1558 			warnf(fc, "%pg: Can't mount, blockdev is frozen", bdev);
1564 	sb->s_bdev = bdev;
1565 	sb->s_bdi = bdi_get(bdev->bd_disk->bdi);
1566 	if (bdev_stable_writes(bdev))
1570 	snprintf(sb->s_id, sizeof(sb->s_id), "%pg", bdev);
1573 	sb_set_blocksize(sb, block_size(bdev));
1674 	struct block_device *bdev = sb->s_bdev;
1677 	if (bdev) {
1678 		sync_blockdev(bdev);