From e852d82a5b55b44ce8be89078d0dfbddbeae3211 Mon Sep 17 00:00:00 2001
From: "Pranay Kr. Srivastava" <pranjas@gmail.com>
Date: Wed, 9 Sep 2015 15:39:09 -0700
Subject: [PATCH] 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>
---
fs/affs/super.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/affs/super.c b/fs/affs/super.c
index 3f89c9e05b407..5b50c4ca43a7d 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)
--
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