[GFS2] Make journaled data files identical to normal files on disk

This is a very large patch, with a few still to be resolved issues
so you might want to check out the previous head of the tree since
this is known to be unstable. Fixes for the various bugs will be
forthcoming shortly.

This patch removes the special data format which has been used
up till now for journaled data files. Directories still retain the
old format so that they will remain on disk compatible with earlier
releases. As a result you can now do the following with journaled
data files:

 1) mmap them
 2) export them over NFS
 3) convert to/from normal files whenever you want to (the zero length
    restriction is gone)

In addition the level at which GFS' locking is done has changed for all
files (since they all now use the page cache) such that the locking is
done at the page cache level rather than the level of the fs operations.
This should mean that things like loopback mounts and other things which
touch the page cache directly should now work.

Current known issues:

 1. There is a lock mode inversion problem related to the resource
    group hold function which needs to be resolved.
 2. Any significant amount of I/O causes an oops with an offset of hex 320
    (NULL pointer dereference) which appears to be related to a journaled data
    buffer appearing on a list where it shouldn't be.
 3. Direct I/O writes are disabled for the time being (will reappear later)
 4. There is probably a deadlock between the page lock and GFS' locks under
    certain combinations of mmap and fs operation I/O.
 5. Issue relating to ref counting on internally used inodes causes a hang
    on umount (discovered before this patch, and not fixed by it)
 6. One part of the directory metadata is different from GFS1 and will need
    to be resolved before next release.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 0 insertions, 52 deletions

diff --git a/fs/gfs2/jdata.h b/fs/gfs2/jdata.h
deleted file mode 100644
index 95e18fcb8f8..00000000000
--- a/fs/gfs2/jdata.h
+++ /dev/null
@@ -1,52 +0,0 @@
-/*
- * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
- *
- * This copyrighted material is made available to anyone wishing to use,
- * modify, copy, or redistribute it subject to the terms and conditions
- * of the GNU General Public License v.2.
- */
-
-#ifndef __FILE_DOT_H__
-#define __FILE_DOT_H__
-
-int gfs2_jdata_get_buffer(struct gfs2_inode *ip, uint64_t block, int new,
-			  struct buffer_head **bhp);
-
-typedef int (*read_copy_fn_t) (struct buffer_head *bh, char **buf,
-			       unsigned int offset, unsigned int size);
-typedef int (*write_copy_fn_t) (struct gfs2_inode *ip,
-				struct buffer_head *bh, const char **buf,
-				unsigned int offset, unsigned int size);
-
-int gfs2_copy2mem(struct buffer_head *bh, char **buf,
-		  unsigned int offset, unsigned int size);
-int gfs2_copy2user(struct buffer_head *bh, char __user **buf,
-		   unsigned int offset, unsigned int size);
-int gfs2_jdata_read(struct gfs2_inode *ip, char __user *buf,
-		    uint64_t offset, unsigned int size,
-		    read_copy_fn_t copy_fn);
-
-int gfs2_copy_from_mem(struct gfs2_inode *ip,
-		       struct buffer_head *bh, const char **buf,
-		       unsigned int offset, unsigned int size);
-int gfs2_copy_from_user(struct gfs2_inode *ip,
-			struct buffer_head *bh, const char __user **buf,
-			unsigned int offset, unsigned int size);
-int gfs2_jdata_write(struct gfs2_inode *ip, const char __user *buf,
-		     uint64_t offset, unsigned int size,
-		     write_copy_fn_t copy_fn);
-
-static inline int gfs2_jdata_read_mem(struct gfs2_inode *ip, char *buf,
-				      uint64_t offset, unsigned int size)
-{
-	return gfs2_jdata_read(ip, (__force char __user *)buf, offset, size, gfs2_copy2mem);
-}
-
-static inline int gfs2_jdata_write_mem(struct gfs2_inode *ip, const char *buf,
-				       uint64_t offset, unsigned int size)
-{
-	return gfs2_jdata_write(ip, (__force const char __user *)buf, offset, size, gfs2_copy_from_mem);
-}
-
-#endif /* __FILE_DOT_H__ */