ntfs: use sb_bdev_nr_blocks

Use the sb_bdev_nr_blocks helper instead of open coding it and clean up
ntfs_fill_super a bit by moving an assignment a little earlier that has
no negative side effects.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Anton Altaparmakov <anton@tuxera.com>
Link: https://lore.kernel.org/r/20211018101130.1838532-29-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index 0d7e948..5ae8de0 100644 (file)
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -2772,13 +2772,12 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
        ntfs_debug("Set device block size to %i bytes (block size bits %i).",
                        blocksize, sb->s_blocksize_bits);
        /* Determine the size of the device in units of block_size bytes. */
-       if (!i_size_read(sb->s_bdev->bd_inode)) {
+       vol->nr_blocks = sb_bdev_nr_blocks(sb);
+       if (!vol->nr_blocks) {
                if (!silent)
                        ntfs_error(sb, "Unable to determine device size.");
                goto err_out_now;
        }
-       vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
-                       sb->s_blocksize_bits;
        /* Read the boot sector and return unlocked buffer head to it. */
        if (!(bh = read_ntfs_boot_sector(sb, silent))) {
                if (!silent)
@@ -2816,8 +2815,7 @@ static int ntfs_fill_super(struct super_block *sb, void *opt, const int silent)
                        goto err_out_now;
                }
                BUG_ON(blocksize != sb->s_blocksize);
-               vol->nr_blocks = i_size_read(sb->s_bdev->bd_inode) >>
-                               sb->s_blocksize_bits;
+               vol->nr_blocks = sb_bdev_nr_blocks(sb);
                ntfs_debug("Changed device block size to %i bytes (block size "
                                "bits %i) to match volume sector size.",
                                blocksize, sb->s_blocksize_bits);