Bring in the ext2fs work done by Aditya Sarawgi during and after Google Summer

of Code 2009:

- BSDL block and inode allocation policies for ext2fs. This involves the use
  FFS1 style block and inode allocation for ext2fs. Preallocation was removed
  since it was GPL'd.
- Make ext2fs MPSAFE by introducing locks to per-mount datastructures.
- Fixes for kern/122047 PR.
- Various small bugfixes.
- Move out of gnu/ directory.

Sponsored by:   Google Inc.
Submitted by:	Aditya Sarawgi <sarawgi.aditya AT SPAMFREE gmail DOT com>

1 files changed, 138 insertions, 0 deletions

diff --git a/sys/fs/ext2fs/ext2_inode_cnv.c b/sys/fs/ext2fs/ext2_inode_cnv.c
new file mode 100644
index 0000000..b042a5a
--- /dev/null
+++ b/sys/fs/ext2fs/ext2_inode_cnv.c
@@ -0,0 +1,138 @@
+/*-
+ * Copyright (c) 1995 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Utah $Hdr$
+ * $FreeBSD$
+ */
+
+/*
+ * routines to convert on disk ext2 inodes into inodes and back
+ */
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/lock.h>
+#include <sys/stat.h>
+#include <sys/vnode.h>
+
+#include <fs/ext2fs/inode.h>
+#include <fs/ext2fs/ext2fs.h>
+#include <fs/ext2fs/ext2_extern.h>
+#include <fs/ext2fs/ext2_dinode.h>
+
+void
+ext2_print_inode( in )
+	struct inode *in;
+{
+	int i;
+
+	printf( "Inode: %5d", in->i_number);
+	printf( /* "Inode: %5d" */
+		" Type: %10s Mode: 0x%o Flags: 0x%x  Version: %d\n",
+		"n/a", in->i_mode, in->i_flags, in->i_gen);
+	printf( "User: %5lu Group: %5lu  Size: %lu\n",
+		(unsigned long)in->i_uid, (unsigned long)in->i_gid,
+		(unsigned long)in->i_size);
+	printf( "Links: %3d Blockcount: %d\n",
+		in->i_nlink, in->i_blocks);
+	printf( "ctime: 0x%x", in->i_ctime);
+	printf( "atime: 0x%x", in->i_atime);
+	printf( "mtime: 0x%x", in->i_mtime);
+	printf( "BLOCKS: ");
+	for(i=0; i < (in->i_blocks <= 24 ? ((in->i_blocks+1)/2): 12); i++)
+		printf("%d ", in->i_db[i]);
+	printf("\n");
+}
+
+/*
+ *	raw ext2 inode to inode
+ */
+void
+ext2_ei2i(ei, ip)
+	struct ext2fs_dinode *ei;
+	struct inode *ip;
+{
+        int i;
+
+	ip->i_nlink = ei->e2di_nlink;
+	/* Godmar thinks - if the link count is zero, then the inode is
+	   unused - according to ext2 standards. Ufs marks this fact
+	   by setting i_mode to zero - why ?
+	   I can see that this might lead to problems in an undelete.
+	*/
+	ip->i_mode = ei->e2di_nlink ? ei->e2di_mode : 0;
+	ip->i_size = ei->e2di_size;
+	if (S_ISREG(ip->i_mode))
+		ip->i_size |= ((u_int64_t)ei->e2di_size_high) << 32;
+	ip->i_atime = ei->e2di_atime;
+	ip->i_mtime = ei->e2di_mtime;
+	ip->i_ctime = ei->e2di_ctime;
+	ip->i_flags = 0;
+	ip->i_flags |= (ei->e2di_flags & EXT2_APPEND) ? SF_APPEND : 0;
+	ip->i_flags |= (ei->e2di_flags & EXT2_IMMUTABLE) ? SF_IMMUTABLE : 0;
+	ip->i_flags |= (ei->e2di_flags & EXT2_NODUMP) ? UF_NODUMP : 0;
+	ip->i_blocks = ei->e2di_nblock;
+	ip->i_gen = ei->e2di_gen;
+	ip->i_uid = ei->e2di_uid;
+	ip->i_gid = ei->e2di_gid;
+	/* XXX use memcpy */
+	for(i = 0; i < NDADDR; i++)
+		ip->i_db[i] = ei->e2di_blocks[i];
+	for(i = 0; i < NIADDR; i++)
+		ip->i_ib[i] = ei->e2di_blocks[EXT2_NDIR_BLOCKS + i];
+}
+
+/*
+ *	inode to raw ext2 inode
+ */
+void
+ext2_i2ei(ip, ei)
+	struct inode *ip;
+	struct ext2fs_dinode *ei;
+{
+	int i;
+
+	ei->e2di_mode = ip->i_mode;
+        ei->e2di_nlink = ip->i_nlink;
+	/* 
+	   Godmar thinks: if dtime is nonzero, ext2 says this inode
+	   has been deleted, this would correspond to a zero link count
+	 */
+	ei->e2di_dtime = ei->e2di_nlink ? 0 : ip->i_mtime;
+	ei->e2di_size = ip->i_size;
+	if (S_ISREG(ip->i_mode))
+		ei->e2di_size_high = ip->i_size >> 32;
+	ei->e2di_atime = ip->i_atime;
+	ei->e2di_mtime = ip->i_mtime;
+	ei->e2di_ctime = ip->i_ctime;
+	ei->e2di_flags = ip->i_flags;
+	ei->e2di_flags = 0;
+	ei->e2di_flags |= (ip->i_flags & SF_APPEND) ? EXT2_APPEND: 0;
+	ei->e2di_flags |= (ip->i_flags & SF_IMMUTABLE) ? EXT2_IMMUTABLE: 0;
+	ei->e2di_flags |= (ip->i_flags & UF_NODUMP) ? EXT2_NODUMP: 0;
+	ei->e2di_nblock = ip->i_blocks;
+	ei->e2di_gen = ip->i_gen;
+	ei->e2di_uid = ip->i_uid;
+	ei->e2di_gid = ip->i_gid;
+	/* XXX use memcpy */
+	for(i = 0; i < NDADDR; i++)
+		ei->e2di_blocks[i] = ip->i_db[i];
+	for(i = 0; i < NIADDR; i++)
+		ei->e2di_blocks[EXT2_NDIR_BLOCKS + i] = ip->i_ib[i];
+}