udf: Cleanup anchor block detection.

UDF anchor block detection is complicated by several things - there are several
places where the anchor point can be, some of them relative to the last
recorded block which some devices report wrongly. Moreover some devices on some
media seem to have 7 spare blocks sectors for every 32 blocks (at least as far
as I understand the old code) so we have to count also with that possibility.

This patch splits anchor block detection into several functions so that it is
clearer what we actually try to do. We fix several bugs of the type "for such
and such media, we fail to check block blah" as a result of the cleanup.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/udf/udf_sb.h b/fs/udf/udf_sb.h
index fb2a6e9f8dac..8308a12e1232 100644
--- a/fs/udf/udf_sb.h
+++ b/fs/udf/udf_sb.h
@@ -100,7 +100,7 @@ struct udf_sb_info {
 
         /* Sector headers */
         __s32                   s_session;
-        __u32                   s_anchor[4];
+        __u32                   s_anchor[3];
         __u32                   s_last_block;
 
         struct buffer_head      *s_lvid_bh;