fs/affs: make root lookup from blkdev logical size

This patch resolves https://bugzilla.kernel.org/show_bug.cgi?id=16531.

When logical blkdev size > 512 then sector numbers become larger than the
device can support.

Make affs start lookup based on the device's logical sector size instead
of 512.

Reported-by: Mark <markk@clara.co.uk>
Suggested-by: Mark <markk@clara.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/fs/affs/super.c b/fs/affs/super.c
index 3f89c9e05b40..5b50c4ca43a7 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -18,6 +18,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/writeback.h>
+#include <linux/blkdev.h>
 #include "affs.h"
 
 static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
@@ -352,18 +353,19 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
          * blocks, we will have to change it.
          */
 
-        size = sb->s_bdev->bd_inode->i_size >> 9;
+        size = i_size_read(sb->s_bdev->bd_inode) >> 9;
         pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
 
         affs_set_blocksize(sb, PAGE_SIZE);
         /* Try to find root block. Its location depends on the block size. */
 
-        i = 512;
-        j = 4096;
+        i = bdev_logical_block_size(sb->s_bdev);
+        j = PAGE_SIZE;
         if (blocksize > 0) {
                 i = j = blocksize;
                 size = size / (blocksize / 512);
         }
+
         for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
                 sbi->s_root_block = root_block;
                 if (root_block < 0)