hfsplus: ensure bio requests are not smaller than the hardware sectors

Currently all bio requests are 512 bytes, which may fail for media
whose physical sector size is larger than this. Ensure these
requests are not smaller than the block device logical block size.

BugLink: http://bugs.launchpad.net/bugs/734883
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 14 insertions, 2 deletions

diff --git a/fs/hfsplus/hfsplus_fs.h b/fs/hfsplus/hfsplus_fs.h
index 0bebf7488feb..81dfd1e495e3 100644
--- a/fs/hfsplus/hfsplus_fs.h
+++ b/fs/hfsplus/hfsplus_fs.h
@@ -13,6 +13,7 @@
 #include <linux/fs.h>
 #include <linux/mutex.h>
 #include <linux/buffer_head.h>
+#include <linux/blkdev.h>
 #include "hfsplus_raw.h"
 
 #define DBG_BNODE_REFS  0x00000001
@@ -110,7 +111,9 @@ struct hfsplus_vh;
 struct hfs_btree;
 
 struct hfsplus_sb_info {
+        void *s_vhdr_buf;
         struct hfsplus_vh *s_vhdr;
+        void *s_backup_vhdr_buf;
         struct hfsplus_vh *s_backup_vhdr;
         struct hfs_btree *ext_tree;
         struct hfs_btree *cat_tree;
@@ -258,6 +261,15 @@ struct hfsplus_readdir_data {
         struct hfsplus_cat_key key;
 };
 
+/*
+ * Find minimum acceptible I/O size for an hfsplus sb.
+ */
+static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
+{
+        return max_t(unsigned short, bdev_logical_block_size(sb->s_bdev),
+                     HFSPLUS_SECTOR_SIZE);
+}
+
 #define hfs_btree_open hfsplus_btree_open
 #define hfs_btree_close hfsplus_btree_close
 #define hfs_btree_write hfsplus_btree_write
@@ -436,8 +448,8 @@ int hfsplus_compare_dentry(const struct dentry *parent,
 /* wrapper.c */
 int hfsplus_read_wrapper(struct super_block *);
 int hfs_part_find(struct super_block *, sector_t *, sector_t *);
-int hfsplus_submit_bio(struct block_device *bdev, sector_t sector,
-                void *data, int rw);
+int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
+                void *buf, void **data, int rw);
 
 /* time macros */
 #define __hfsp_mt2ut(t)         (be32_to_cpu(t) - 2082844800U)