fs/ntfs3: Prevent generic message "attempt to access beyond end of device"

[linux-block.git] / fs / ntfs3 / fsntfs.c

diff --git a/fs/ntfs3/fsntfs.c b/fs/ntfs3/fsntfs.c
index 321978019407f4f3dc32971d7893490782e60c7f..ae2ef5c11868c360f1285feffae734b2974d0d5c 100644 (file)
--- a/fs/ntfs3/fsntfs.c
+++ b/fs/ntfs3/fsntfs.c
@@ -1007,6 +1007,30 @@ static inline __le32 security_hash(const void *sd, size_t bytes)
        return cpu_to_le32(hash);
 }
 
+/*
+ * simple wrapper for sb_bread_unmovable.
+ */
+struct buffer_head *ntfs_bread(struct super_block *sb, sector_t block)
+{
+       struct ntfs_sb_info *sbi = sb->s_fs_info;
+       struct buffer_head *bh;
+
+       if (unlikely(block >= sbi->volume.blocks)) {
+               /* prevent generic message "attempt to access beyond end of device" */
+               ntfs_err(sb, "try to read out of volume at offset 0x%llx",
+                        (u64)block << sb->s_blocksize_bits);
+               return NULL;
+       }
+
+       bh = sb_bread_unmovable(sb, block);
+       if (bh)
+               return bh;
+
+       ntfs_err(sb, "failed to read volume at offset 0x%llx",
+                (u64)block << sb->s_blocksize_bits);
+       return NULL;
+}
+
 int ntfs_sb_read(struct super_block *sb, u64 lbo, size_t bytes, void *buffer)
 {
        struct block_device *bdev = sb->s_bdev;