openwrt-xburst/target/linux/generic-2.6/patches-2.6.31/233-jffs2_whiteout_support.patch

--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -34,6 +34,9 @@
 static int jffs2_rename (struct inode *, struct dentry *,
 			 struct inode *, struct dentry *);
 
+static int jffs2_whiteout (struct inode *, struct dentry *, struct dentry *);
+static int jffs2_fallthru (struct inode *, struct dentry *);
+
 const struct file_operations jffs2_dir_operations =
 {
 	.read =		generic_read_dir,
@@ -55,6 +58,8 @@
 	.rmdir =	jffs2_rmdir,
 	.mknod =	jffs2_mknod,
 	.rename =	jffs2_rename,
+	.fallthru =     jffs2_fallthru,
+	.whiteout =     jffs2_whiteout,
 	.permission =	jffs2_permission,
 	.setattr =	jffs2_setattr,
 	.setxattr =	jffs2_setxattr,
@@ -98,8 +103,21 @@
 			fd = fd_list;
 		}
 	}
-	if (fd)
-		ino = fd->ino;
+	if (fd) {
+		spin_lock(&target->d_lock);
+		switch(fd->type) {
+		case DT_WHT:
+			target->d_flags |= DCACHE_WHITEOUT;
+			break;
+		case DT_UNKNOWN:
+			target->d_flags |= DCACHE_FALLTHRU;
+			break;
+		default:
+			ino = fd->ino;
+			break;
+		}
+		spin_unlock(&target->d_lock);
+	}
 	mutex_unlock(&dir_f->sem);
 	if (ino) {
 		inode = jffs2_iget(dir_i->i_sb, ino);
@@ -155,7 +173,9 @@
 				  fd->name, fd->ino, fd->type, curofs, offset));
 			continue;
 		}
-		if (!fd->ino) {
+		if (fd->type == DT_UNKNOWN)
+			fd->ino = 100; /* XXX: arbitrary */
+		else if (!fd->ino && (fd->type != DT_WHT)) {
 			D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 			offset++;
 			continue;
@@ -498,6 +518,11 @@
 		return PTR_ERR(inode);
 	}
 
+	if (dentry->d_flags & DCACHE_WHITEOUT) {
+		inode->i_flags |= S_OPAQUE;
+		ri->flags = cpu_to_je16(JFFS2_INO_FLAG_OPAQUE);
+	}
+
 	inode->i_op = &jffs2_dir_inode_operations;
 	inode->i_fop = &jffs2_dir_operations;
 
@@ -779,6 +804,82 @@
 	return 0;
 }
 
+static int jffs2_fallthru (struct inode *dir, struct dentry *dentry)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir->i_sb);
+	uint32_t now;
+	int ret;
+
+	now = get_seconds();
+	ret = jffs2_do_link(c, JFFS2_INODE_INFO(dir), 0, DT_UNKNOWN,
+			    dentry->d_name.name, dentry->d_name.len, now);
+	if (ret)
+		return ret;
+
+	d_instantiate(dentry, NULL);
+	spin_lock(&dentry->d_lock);
+	dentry->d_flags |= DCACHE_FALLTHRU;
+	spin_unlock(&dentry->d_lock);
+
+	return 0;
+}
+
+static int jffs2_whiteout (struct inode *dir, struct dentry *old_dentry,
+			   struct dentry *new_dentry)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(dir->i_sb);
+	struct jffs2_inode_info *victim_f = NULL;
+	uint32_t now;
+	int ret;
+
+	/* If it's a directory, then check whether it is really empty
+	 */
+	if (new_dentry->d_inode) {
+		victim_f = JFFS2_INODE_INFO(old_dentry->d_inode);
+		if (S_ISDIR(old_dentry->d_inode->i_mode)) {
+			struct jffs2_full_dirent *fd;
+
+			mutex_lock(&victim_f->sem);
+			for (fd = victim_f->dents; fd; fd = fd->next) {
+				if (fd->ino) {
+					mutex_unlock(&victim_f->sem);
+					return -ENOTEMPTY;
+				}
+			}
+			mutex_unlock(&victim_f->sem);
+		}
+	}
+
+	now = get_seconds();
+	ret = jffs2_do_link(c, JFFS2_INODE_INFO(dir), 0, DT_WHT,
+			    new_dentry->d_name.name, new_dentry->d_name.len, now);
+	if (ret)
+		return ret;
+
+	spin_lock(&new_dentry->d_lock);
+	new_dentry->d_flags &= ~DCACHE_FALLTHRU;
+	new_dentry->d_flags |= DCACHE_WHITEOUT;
+	spin_unlock(&new_dentry->d_lock);
+	d_add(new_dentry, NULL);
+
+	if (victim_f) {
+		/* There was a victim. Kill it off nicely */
+		drop_nlink(old_dentry->d_inode);
+		/* Don't oops if the victim was a dirent pointing to an
+		   inode which didn't exist. */
+		if (victim_f->inocache) {
+			mutex_lock(&victim_f->sem);
+			if (S_ISDIR(old_dentry->d_inode->i_mode))
+				victim_f->inocache->pino_nlink = 0;
+			else
+				victim_f->inocache->pino_nlink--;
+			mutex_unlock(&victim_f->sem);
+		}
+	}
+
+	return 0;
+}
+
 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 			 struct inode *new_dir_i, struct dentry *new_dentry)
 {
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -301,6 +301,10 @@
 
 		inode->i_op = &jffs2_dir_inode_operations;
 		inode->i_fop = &jffs2_dir_operations;
+
+		if (je16_to_cpu(latest_node.flags) & JFFS2_INO_FLAG_OPAQUE)
+			inode->i_flags |= S_OPAQUE;
+
 		break;
 	}
 	case S_IFREG:
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -172,7 +172,7 @@
 
 	sb->s_op = &jffs2_super_operations;
 	sb->s_export_op = &jffs2_export_ops;
-	sb->s_flags = sb->s_flags | MS_NOATIME;
+	sb->s_flags = sb->s_flags | MS_NOATIME | MS_WHITEOUT;
 	sb->s_xattr = jffs2_xattr_handlers;
 #ifdef CONFIG_JFFS2_FS_POSIX_ACL
 	sb->s_flags |= MS_POSIXACL;
--- a/include/linux/jffs2.h
+++ b/include/linux/jffs2.h
@@ -87,6 +87,8 @@
 #define JFFS2_INO_FLAG_USERCOMPR  2	/* User has requested a specific
 					   compression type */
 
+#define JFFS2_INO_FLAG_OPAQUE     4	/* Directory is opaque (for union mounts) */
+
 
 /* These can go once we've made sure we've caught all uses without
    byteswapping */