[PATCH] bug fix for the ntfs driver

[Bean]

Hi,

This patch fix a bug in the ntfs driver which occurs when accessing
certain compressed files.

-- 
Bean

2007-08-16  Bean  <address@hidden>

        * fs/ntfs.c (read_block): Bug fix for compressed files.


Index: fs/ntfs.c
===================================================================
RCS file: /sources/grub/grub2/fs/ntfs.c,v
retrieving revision 1.1
diff -u -p -r1.1 ntfs.c
--- fs/ntfs.c   3 Aug 2007 07:44:01 -0000       1.1
+++ fs/ntfs.c   15 Aug 2007 16:15:48 -0000
@@ -665,9 +665,6 @@ read_block (struct grub_ntfs_rlst *ctx,
              if (read_run_list (ctx))
                return grub_errno;
            }
-         if (ctx->target_vcn + 16 < ctx->next_vcn)
-           return grub_error (GRUB_ERR_BAD_FS,
-                              "Compression block should be 16 sector long");
        }

       nn = (16 - (ctx->target_vcn & 0xF)) / cpb;
@@ -732,7 +729,9 @@ read_block (struct grub_ntfs_rlst *ctx,
              if (buf)
                {
                  if (grub_disk_read
-                     (ctx->comp.disk, ctx->curr_lcn * ctx->comp.spc, 0,
+                     (ctx->comp.disk,
+                      (ctx->target_vcn - ctx->curr_vcn +
+                       ctx->curr_lcn) * ctx->comp.spc, 0,
                       nn * (ctx->comp.spc << BLK_SHR), buf))
                    return grub_errno;
                  buf += nn * (ctx->comp.spc << BLK_SHR);