fs: add freeze_super/thaw_super fs hooks

[deliverable/linux.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index cc9d4114cda085e1f0edac3b1d80341c8db75b58..b48c41bf0f86755200808c1b33a82ce6c8066d71 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -235,7 +235,10 @@ struct super_block *freeze_bdev(struct block_device *bdev)
        sb = get_active_super(bdev);
        if (!sb)
                goto out;
-       error = freeze_super(sb);
+       if (sb->s_op->freeze_super)
+               error = sb->s_op->freeze_super(sb);
+       else
+               error = freeze_super(sb);
        if (error) {
                deactivate_super(sb);
                bdev->bd_fsfreeze_count--;
@@ -272,7 +275,10 @@ int thaw_bdev(struct block_device *bdev, struct super_block *sb)
        if (!sb)
                goto out;
 
-       error = thaw_super(sb);
+       if (sb->s_op->thaw_super)
+               error = sb->s_op->thaw_super(sb);
+       else
+               error = thaw_super(sb);
        if (error) {
                bdev->bd_fsfreeze_count++;
                mutex_unlock(&bdev->bd_fsfreeze_mutex);
@@ -1585,7 +1591,7 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
 }
 EXPORT_SYMBOL_GPL(blkdev_write_iter);
 
-static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
+ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
        struct file *file = iocb->ki_filp;
        struct inode *bd_inode = file->f_mapping->host;
@@ -1599,6 +1605,7 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
        iov_iter_truncate(to, size);
        return generic_file_read_iter(iocb, to);
 }
+EXPORT_SYMBOL_GPL(blkdev_read_iter);
 
 /*
  * Try to release a page associated with block device when the system