ext2fs updates from ffs

[Pedro F. Giffuni]

Hello;

The attached patch is meant for FreeBSD but the affected code doesn't 
seem to have changed in DragonFly (other that relocation that is). It 
may require some tweaking to apply correctly though.

It basically adopts some changes that we made with the Lite2 commit and 
a afterwards in ffs. A one liner fix from Bruce Evans is also included. 
This should also help future adoption of the BSD-licensed ext2fs port 
that has been progressing as part of FreeBSD's Google Summer of Code.

enjoy,

   Pedro.
diff -u ext2fs.orig/ext2_alloc.c ext2fs/ext2_alloc.c
--- ext2fs.orig/ext2_alloc.c	2009-08-18 20:32:13.000000000 -0500
+++ ext2fs/ext2_alloc.c	2009-08-28 09:44:04.000000000 -0500
@@ -1,4 +1,4 @@
-/*-
+w/*-
  *  modified for Lites 1.1
  *
  *  Aug 1995, Godmar Back (gback at cs.utah.edu)
@@ -441,7 +441,7 @@
 	/* if the next block is actually what we thought it is,
 	   then set the goal to what we thought it should be
 	*/
-	if(ip->i_next_alloc_block == lbn)
+	if(ip->i_next_alloc_block == lbn && ip->i_next_alloc_goal != 0)
 		return ip->i_next_alloc_goal;
 
 	/* now check whether we were provided with an array that basically
diff -u ext2fs.orig/ext2_inode.c ext2fs/ext2_inode.c
--- ext2fs.orig/ext2_inode.c	2009-08-18 20:32:13.000000000 -0500
+++ ext2fs/ext2_inode.c	2009-09-01 13:29:55.000000000 -0500
@@ -126,16 +126,11 @@
 	long count, nblocks, blocksreleased = 0;
 	int aflags, error, i, allerror;
 	off_t osize;
-/*
-printf("ext2_truncate called %d to %d\n", VTOI(ovp)->i_number, length);
-*/	/* 
-	 * negative file sizes will totally break the code below and
-	 * are not meaningful anyways.
-	 */
+
+	oip = VTOI(ovp);	 
 	if (length < 0)
-	    return EFBIG;
+		return (EINVAL);
 
-	oip = VTOI(ovp);
 	if (ovp->v_type == VLNK &&
 	    oip->i_size < ovp->v_mount->mnt_maxsymlinklen) {
 #ifdef DIAGNOSTIC
@@ -157,23 +152,29 @@
 	/*
 	 * Lengthen the size of the file. We must ensure that the
 	 * last byte of the file is allocated. Since the smallest
-	 * value of oszie is 0, length will be at least 1.
+	 * value of osize is 0, length will be at least 1.
 	 */
 	if (osize < length) {
 		if (length > oip->i_e2fs->fs_maxfilesize)
 			return (EFBIG);
+		vnode_pager_setsize(ovp, length);
 		offset = blkoff(fs, length - 1);
 		lbn = lblkno(fs, length - 1);
 		aflags = B_CLRBUF;
 		if (flags & IO_SYNC)
 			aflags |= B_SYNC;
-		vnode_pager_setsize(ovp, length);
-		if ((error = ext2_balloc(oip, lbn, offset + 1, cred, &bp,
-		    aflags)) != 0)
+		error = ext2_balloc(oip, lbn, offset + 1, cred, &bp, aflags)
+		if (error) {
+			vnode_pager_setsize(vp, osize);
 			return (error);
+		}
 		oip->i_size = length;
-		if (aflags & IO_SYNC)
+		if (bp->b_bufsize == fs->fs_bsize)
+			bp->b_flags |= B_CLUSTEROK;
+		if (aflags & B_SYNC)
 			bwrite(bp);
+		else if (ovp->v_mount->mnt_flag & MNT_ASYNC)
+			bdwrite(bp);
 		else
 			bawrite(bp);
 		oip->i_flag |= IN_CHANGE | IN_UPDATE;
@@ -195,15 +196,19 @@
 		aflags = B_CLRBUF;
 		if (flags & IO_SYNC)
 			aflags |= B_SYNC;
-		if ((error = ext2_balloc(oip, lbn, offset, cred, &bp,
-		    aflags)) != 0)
+		error = ext2_balloc(oip, lbn, offset, cred, &bp, aflags)
+		if (error)
 			return (error);
 		oip->i_size = length;
 		size = blksize(fs, oip, lbn);
 		bzero((char *)bp->b_data + offset, (u_int)(size - offset));
 		allocbuf(bp, size);
-		if (aflags & IO_SYNC)
+		if (bp->b_bufsize == fs->fs_bsize)
+			bp->b_flags |= B_CLUSTEROK;
+		if (aflags & B_SYNC)
 			bwrite(bp);
+		else if (ovp->v_mount->mnt_flag & MNT_ASYNC)
+			bdwrite(bp);
 		else
 			bawrite(bp);
 	}
@@ -247,6 +252,7 @@
 	error = vtruncbuf(ovp, cred, td, length, (int)fs->s_blocksize);
 	if (error && (allerror == 0))
 		allerror = error;
+	vnode_pager_setsize(ovp, length);
 
 	/*
 	 * Indirect blocks first.
diff -u ext2fs.orig/ext2_vfsops.c ext2fs/ext2_vfsops.c
--- ext2fs.orig/ext2_vfsops.c	2009-08-18 20:32:13.000000000 -0500
+++ ext2fs/ext2_vfsops.c	2009-08-27 21:44:12.000000000 -0500
@@ -171,8 +171,6 @@
 			flags = WRITECLOSE;
 			if (mp->mnt_flag & MNT_FORCE)
 				flags |= FORCECLOSE;
-			if (vfs_busy(mp, LK_NOWAIT, 0, td))
-				return (EBUSY);
 			error = ext2_flushfiles(mp, flags, td);
 			vfs_unbusy(mp, td);
 			if (!error && fs->s_wasvalid) {
@@ -500,6 +498,7 @@
  *	4) invalidate all inactive vnodes.
  *	5) invalidate all cached file data.
  *	6) re-read inode data for all active vnodes.
+ * XXX we are missing some steps, in particular # 3
  */
 static int
 ext2_reload(struct mount *mp, struct thread *td)
@@ -1007,8 +1006,8 @@
 		 * still zero, it will be unlinked and returned to the free
 		 * list by vput().
 		 */
-		vput(vp);
 		brelse(bp);
+		vput(vp);
 		*vpp = NULL;
 		return (error);
 	}
@@ -1032,7 +1031,7 @@
 /*
 	ext2_print_inode(ip);
 */
-	brelse(bp);
+	bqrelse(bp);
 
 	/*
 	 * Initialize the vnode from the inode, check for aliases.