btrfsctl

Makefile

@@ -1,7 +1,7 @@
 CC=gcc
 CFLAGS = -g -Wall -Werror
 headers = radix-tree.h ctree.h disk-io.h kerncompat.h print-tree.h list.h \
-	  transaction.h
+	  transaction.h ioctl.h
 objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
 	  root-tree.o dir-item.o hash.o file-item.o inode-item.o \
 	  inode-map.o \
@@ -16,7 +16,11 @@ check=sparse $(CHECKFLAGS)
 	$(check) $<
 	$(CC) $(CFLAGS) -c $<
 
-all: bit-radix-test tester debug-tree quick-test dir-test tags mkfs.btrfs
+all: bit-radix-test tester debug-tree quick-test dir-test tags mkfs.btrfs \
+	btrfsctl
+
+btrfsctl: ioctl.h btrfsctl.o
+	gcc $(CFLAGS) -o btrfsctl btrfsctl.o
 
 mkfs.btrfs: $(objects) mkfs.o
 	gcc $(CFLAGS) -o mkfs.btrfs $(objects) mkfs.o -luuid

btrfsctl.c

@@ -0,0 +1,62 @@
+#ifndef __CHECKER__
+#include <sys/ioctl.h>
+#include <sys/mount.h>
+#include "ioctl.h"
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "kerncompat.h"
+
+#ifdef __CHECKER__
+#define BLKGETSIZE64 0
+#define BTRFS_IOC_SNAP_CREATE 0
+#define BTRFS_VOL_NAME_MAX 255
+struct btrfs_ioctl_vol_args { char name[BTRFS_VOL_NAME_MAX]; };
+static inline int ioctl(int fd, int define, void *arg) { return 0; }
+#endif
+
+void print_usage(void)
+{
+	printf("usage: btrfsctl [ -s snapshot_name ] dir\n");
+	exit(1);
+}
+
+int main(int ac, char **av)
+{
+	char *fname;
+	int fd;
+	int ret;
+	struct btrfs_ioctl_vol_args args;
+	char *name;
+	int i;
+
+	for (i = 1; i < ac - 1; i++) {
+		if (strcmp(av[i], "-s") == 0) {
+			if (i + 1 >= ac - 1) {
+				fprintf(stderr, "-s requires an arg");
+				print_usage();
+			}
+			name = av[i + 1];
+			if (strlen(name) >= BTRFS_VOL_NAME_MAX) {
+				fprintf(stderr, "snapshot name is too long\n");
+				exit(1);
+			}
+		}
+	}
+	fname = av[ac - 1];
+printf("fname is %s\n", fname);
+	fd = open(fname, O_RDWR);
+	if (fd < 0) {
+		perror("open");
+		exit(1);
+	}
+	strcpy(args.name, name);
+	ret = ioctl(fd, BTRFS_IOC_SNAP_CREATE, &args);
+	printf("ioctl returns %d\n", ret);
+	return 0;
+}
+

debug-tree.c

@@ -11,7 +11,14 @@
 int main(int ac, char **av) {
 	struct btrfs_super_block super;
 	struct btrfs_root *root;
+	struct btrfs_path path;
+	struct btrfs_key key;
+	struct btrfs_root_item *ri;
+	struct btrfs_leaf *leaf;
+	struct btrfs_key found_key;
 	char uuidbuf[37];
+	int ret;
+	int slot;
 
 	if (ac != 2) {
 		fprintf(stderr, "usage: %s device\n", av[0]);
@@ -23,17 +30,53 @@ int main(int ac, char **av) {
 		fprintf(stderr, "unable to open %s\n", av[1]);
 		exit(1);
 	}
-	printf("fs tree\n");
-	btrfs_print_tree(root, root->node);
-	printf("map tree\n");
-	btrfs_print_tree(root->fs_info->extent_root,
-			 root->fs_info->extent_root->node);
-	printf("inode tree\n");
-	btrfs_print_tree(root->fs_info->inode_root,
-			 root->fs_info->inode_root->node);
 	printf("root tree\n");
 	btrfs_print_tree(root->fs_info->tree_root,
 			 root->fs_info->tree_root->node);
+	btrfs_init_path(&path);
+	key.offset = 0;
+	key.objectid = 0;
+	key.flags = 0;
+	btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
+	ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
+					&key, &path, 0, 0);
+	BUG_ON(ret < 0);
+	while(1) {
+		leaf = &path.nodes[0]->leaf;
+		slot = path.slots[0];
+		if (slot >= btrfs_header_nritems(&leaf->header)) {
+			ret = btrfs_next_leaf(root, &path);
+			if (ret != 0)
+				break;
+			leaf = &path.nodes[0]->leaf;
+			slot = path.slots[0];
+		}
+		btrfs_disk_key_to_cpu(&found_key,
+				      &leaf->items[path.slots[0]].key);
+		if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
+			struct btrfs_buffer *buf;
+			ri = btrfs_item_ptr(leaf, path.slots[0],
+					    struct btrfs_root_item);
+			buf = read_tree_block(root->fs_info->tree_root,
+					      btrfs_root_blocknr(ri));
+			switch(found_key.objectid) {
+			case BTRFS_ROOT_TREE_OBJECTID:
+				printf("root ");
+				break;
+			case BTRFS_EXTENT_TREE_OBJECTID:
+				printf("extent tree ");
+				break;
+			case BTRFS_INODE_MAP_OBJECTID:
+				printf("inode map");
+				break;
+			}
+			printf("tree %Lu %Lu %u\n", found_key.objectid,
+			       found_key.offset, found_key.flags);
+			btrfs_print_tree(root, buf);
+		}
+		path.slots[0]++;
+	}
+	btrfs_release_path(root, &path);
 	printf("total blocks %Lu\n", btrfs_super_total_blocks(&super));
 	printf("blocks used %Lu\n", btrfs_super_blocks_used(&super));
 	uuidbuf[36] = '\0';

disk-io.c

@@ -18,9 +18,6 @@ static int check_tree_block(struct btrfs_root *root, struct btrfs_buffer *buf)
 {
 	if (buf->blocknr != btrfs_header_blocknr(&buf->node.header))
 		BUG();
-	if (root->node && btrfs_header_parentid(&buf->node.header) !=
-	    btrfs_header_parentid(&root->node->node.header))
-		BUG();
 	if (memcmp(root->fs_info->disk_super->fsid, buf->node.header.fsid,
 		   sizeof(buf->node.header.fsid)))
 		BUG();

ioctl.h

@@ -0,0 +1,13 @@
+#ifndef __IOCTL_
+#define __IOCTL_
+#include <linux/ioctl.h>
+
+#define BTRFS_IOCTL_MAGIC 0x94
+#define BTRFS_VOL_NAME_MAX 255
+struct btrfs_ioctl_vol_args {
+	char name[BTRFS_VOL_NAME_MAX + 1];
+};
+
+#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
+				   struct btrfs_ioctl_vol_args)
+#endif