X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=find-root.c;h=7e4c51f670aeb89485ea653701f8d3b7726e555e;hb=634e73e9d3464e7a333eda10ef3e5652d8d32293;hp=20ff97211c613a3ecab2bbb0c09802fd9b2fcacc;hpb=82ac34581e8fae6ef3f84758361c75f5b30c576d;p=platform%2Fupstream%2Fbtrfs-progs.git

diff --git a/find-root.c b/find-root.c
index 20ff972..7e4c51f 100644
--- a/find-root.c
+++ b/find-root.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2011 Red Hat.  All rights reserved.
+ * Copyright (C) 2015 Fujitsu.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public
@@ -16,418 +16,134 @@
  * Boston, MA 021110-1307, USA.
  */
 
-#define _XOPEN_SOURCE 500
-#define _GNU_SOURCE 1
+#include "kerncompat.h"
+
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <zlib.h>
-#include "kerncompat.h"
 #include "ctree.h"
-#include "disk-io.h"
-#include "print-tree.h"
-#include "transaction.h"
-#include "list.h"
-#include "version.h"
-#include "volumes.h"
 #include "utils.h"
-#include "crc32c.h"
-
-static u16 csum_size = 0;
-static u64 search_objectid = BTRFS_ROOT_TREE_OBJECTID;
-
-static void usage()
-{
-	fprintf(stderr, "Usage: find-roots [-o search_objectid] <device>\n");
-}
-
-int csum_block(void *buf, u32 len)
+#include "find-root.h"
+#include "volumes.h"
+#include "disk-io.h"
+#include "extent-cache.h"
+
+/* Return value is the same as btrfs_find_root_search(). */
+static int add_eb_to_result(struct extent_buffer *eb,
+			    struct cache_tree *result,
+			    u32 nodesize,
+			    struct btrfs_find_root_filter *filter,
+			    struct cache_extent **match)
 {
-	char *result;
-	u32 crc = ~(u32)0;
+	u64 generation = btrfs_header_generation(eb);
+	u64 level = btrfs_header_level(eb);
+	u64 owner = btrfs_header_owner(eb);
+	u64 start = eb->start;
+	struct cache_extent *cache;
+	struct btrfs_find_root_gen_cache *gen_cache = NULL;
 	int ret = 0;
 
-	result = malloc(csum_size * sizeof(char));
-	if (!result) {
-		fprintf(stderr, "No memory\n");
-		return 1;
-	}
-
-	len -= BTRFS_CSUM_SIZE;
-	crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len);
-	btrfs_csum_final(crc, result);
+	if (owner != filter->objectid || level < filter->level ||
+	    generation < filter->generation)
+		return ret;
 
-	if (memcmp(buf, result, csum_size))
+	/*
+	 * Get the generation cache or create one
+	 *
+	 * NOTE: search_cache_extent() may return cache that doesn't cover
+	 * the range. So we need an extra check to make sure it's the right one.
+	 */
+	cache = search_cache_extent(result, generation);
+	if (!cache || cache->start != generation) {
+		gen_cache = malloc(sizeof(*gen_cache));
+		BUG_ON(!gen_cache);
+		cache = &gen_cache->cache;
+		cache->start = generation;
+		cache->size = 1;
+		cache->objectid = 0;
+		gen_cache->highest_level = 0;
+		cache_tree_init(&gen_cache->eb_tree);
+
+		ret = insert_cache_extent(result, cache);
+		if (ret < 0)
+			return ret;
+	}
+	gen_cache = container_of(cache, struct btrfs_find_root_gen_cache,
+				 cache);
+
+	/* Higher level, clean tree and insert the new one */
+	if (level > gen_cache->highest_level) {
+		free_extent_cache_tree(&gen_cache->eb_tree);
+		gen_cache->highest_level = level;
+		/* Fall into the insert routine */
+	}
+
+	/* Same level, insert it into the eb_tree */
+	if (level == gen_cache->highest_level) {
+		ret = add_cache_extent(&gen_cache->eb_tree,
+				       start, nodesize);
+		if (ret < 0 && ret != -EEXIST)
+			return ret;
+		ret = 0;
+	}
+	if (generation == filter->match_gen &&
+	    level == filter->match_level &&
+	    !filter->search_all) {
 		ret = 1;
-	free(result);
-	return ret;
-}
-
-static int close_all_devices(struct btrfs_fs_info *fs_info)
-{
-	struct list_head *list;
-	struct list_head *next;
-	struct btrfs_device *device;
-
-	return 0;
-
-	list = &fs_info->fs_devices->devices;
-	list_for_each(next, list) {
-		device = list_entry(next, struct btrfs_device, dev_list);
-		close(device->fd);
-	}
-	return 0;
-}
-
-static struct btrfs_root *open_ctree_broken(int fd, const char *device)
-{
-	u32 sectorsize;
-	u32 nodesize;
-	u32 leafsize;
-	u32 blocksize;
-	u32 stripesize;
-	u64 generation;
-	struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
-	struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
-	int ret;
-	struct btrfs_super_block *disk_super;
-	struct btrfs_fs_devices *fs_devices = NULL;
-	u64 total_devs;
-	u64 features;
-
-	ret = btrfs_scan_one_device(fd, device, &fs_devices,
-				    &total_devs, BTRFS_SUPER_INFO_OFFSET);
-
-	if (ret) {
-		fprintf(stderr, "No valid Btrfs found on %s\n", device);
-		goto out;
+		if (match)
+			*match = search_cache_extent(&gen_cache->eb_tree,
+						     start);
 	}
-
-	if (total_devs != 1) {
-		ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
-		if (ret)
-			goto out;
-	}
-
-	memset(fs_info, 0, sizeof(*fs_info));
-	fs_info->tree_root = tree_root;
-	fs_info->extent_root = extent_root;
-	fs_info->chunk_root = chunk_root;
-	fs_info->dev_root = dev_root;
-	fs_info->csum_root = csum_root;
-
-	fs_info->readonly = 1;
-
-	extent_io_tree_init(&fs_info->extent_cache);
-	extent_io_tree_init(&fs_info->free_space_cache);
-	extent_io_tree_init(&fs_info->block_group_cache);
-	extent_io_tree_init(&fs_info->pinned_extents);
-	extent_io_tree_init(&fs_info->pending_del);
-	extent_io_tree_init(&fs_info->extent_ins);
-	cache_tree_init(&fs_info->fs_root_cache);
-
-	cache_tree_init(&fs_info->mapping_tree.cache_tree);
-
-	mutex_init(&fs_info->fs_mutex);
-	fs_info->fs_devices = fs_devices;
-	INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
-	INIT_LIST_HEAD(&fs_info->space_info);
-
-	__setup_root(4096, 4096, 4096, 4096, tree_root,
-		     fs_info, BTRFS_ROOT_TREE_OBJECTID);
-
-	ret = btrfs_open_devices(fs_devices, O_RDONLY);
-	if (ret)
-		goto out_cleanup;
-
-	fs_info->super_bytenr = BTRFS_SUPER_INFO_OFFSET;
-	disk_super = &fs_info->super_copy;
-	ret = btrfs_read_dev_super(fs_devices->latest_bdev,
-				   disk_super, BTRFS_SUPER_INFO_OFFSET);
-	if (ret) {
-		printk("No valid btrfs found\n");
-		goto out_devices;
-	}
-
-	memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
-
-
-	features = btrfs_super_incompat_flags(disk_super) &
-		   ~BTRFS_FEATURE_INCOMPAT_SUPP;
-	if (features) {
-		printk("couldn't open because of unsupported "
-		       "option features (%Lx).\n", features);
-		goto out_devices;
-	}
-
-	features = btrfs_super_incompat_flags(disk_super);
-	if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
-		features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
-		btrfs_set_super_incompat_flags(disk_super, features);
-	}
-
-	nodesize = btrfs_super_nodesize(disk_super);
-	leafsize = btrfs_super_leafsize(disk_super);
-	sectorsize = btrfs_super_sectorsize(disk_super);
-	stripesize = btrfs_super_stripesize(disk_super);
-	tree_root->nodesize = nodesize;
-	tree_root->leafsize = leafsize;
-	tree_root->sectorsize = sectorsize;
-	tree_root->stripesize = stripesize;
-
-	ret = btrfs_read_sys_array(tree_root);
-	if (ret)
-		goto out_devices;
-	blocksize = btrfs_level_size(tree_root,
-				     btrfs_super_chunk_root_level(disk_super));
-	generation = btrfs_super_chunk_root_generation(disk_super);
-
-	__setup_root(nodesize, leafsize, sectorsize, stripesize,
-		     chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
-
-	chunk_root->node = read_tree_block(chunk_root,
-					   btrfs_super_chunk_root(disk_super),
-					   blocksize, generation);
-	if (!chunk_root->node) {
-		printk("Couldn't read chunk root\n");
-		goto out_devices;
-	}
-
-	read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
-	         (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
-		 BTRFS_UUID_SIZE);
-
-	if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
-		ret = btrfs_read_chunk_tree(chunk_root);
-		if (ret)
-			goto out_chunk;
-	}
-
-	return fs_info->chunk_root;
-out_chunk:
-	free_extent_buffer(fs_info->chunk_root->node);
-out_devices:
-	close_all_devices(fs_info);
-out_cleanup:
-	extent_io_tree_cleanup(&fs_info->extent_cache);
-	extent_io_tree_cleanup(&fs_info->free_space_cache);
-	extent_io_tree_cleanup(&fs_info->block_group_cache);
-	extent_io_tree_cleanup(&fs_info->pinned_extents);
-	extent_io_tree_cleanup(&fs_info->pending_del);
-	extent_io_tree_cleanup(&fs_info->extent_ins);
-out:
-	free(tree_root);
-	free(extent_root);
-	free(chunk_root);
-	free(dev_root);
-	free(csum_root);
-	free(fs_info);
-	return NULL;
-}
-
-static int search_iobuf(struct btrfs_root *root, void *iobuf,
-			size_t iobuf_size, off_t offset)
-{
-	u64 gen = btrfs_super_generation(&root->fs_info->super_copy);
-	u64 objectid = search_objectid;
-	u32 size = btrfs_super_nodesize(&root->fs_info->super_copy);
-	u8 level = root->fs_info->super_copy.root_level;
-	size_t block_off = 0;
-
-	while (block_off < iobuf_size) {
-		void *block = iobuf + block_off;
-		struct btrfs_header *header = block;
-		u64 h_byte, h_level, h_gen, h_owner;
-
-//		printf("searching %Lu\n", offset + block_off);
-		h_byte = le64_to_cpu(header->bytenr);
-		h_owner = le64_to_cpu(header->owner);
-		h_level = header->level;
-		h_gen = le64_to_cpu(header->generation);
-
-		if (h_owner != objectid)
-			goto next;
-		if (h_byte != (offset + block_off))
-			goto next;
-		if (h_level != level)
-			goto next;
-		if (csum_block(block, size)) {
-			fprintf(stderr, "Well block %Lu seems good, "
-				"but the csum doesn't match\n",
-				h_byte);
-			goto next;
-		}
-		if (h_gen != gen) {
-			fprintf(stderr, "Well block %Lu seems great, "
-				"but generation doesn't match, "
-				"have=%Lu, want=%Lu\n", h_byte, h_gen,
-				gen);
-			goto next;
-		}
-		printf("Found tree root at %Lu\n", h_byte);
-		return 0;
-next:
-		block_off += size;
-	}
-
-	return 1;
-}
-
-static int read_physical(struct btrfs_root *root, int fd, u64 offset,
-			 u64 bytenr, u64 len)
-{
-	char *iobuf = malloc(len);
-	ssize_t done;
-	size_t total_read = 0;
-	int ret = 1;
-
-	if (!iobuf) {
-		fprintf(stderr, "No memory\n");
-		return -1;
-	}
-
-	while (total_read < len) {
-		done = pread64(fd, iobuf + total_read, len - total_read,
-			       bytenr + total_read);
-		if (done < 0) {
-			fprintf(stderr, "Failed to read: %s\n",
-				strerror(errno));
-			ret = -1;
-			goto out;
-		}
-		total_read += done;
-	}
-
-	ret = search_iobuf(root, iobuf, total_read, offset);
-out:
-	free(iobuf);
 	return ret;
 }
 
-static int find_root(struct btrfs_root *root)
+/*
+ * Return 0 if iterating all the metadata extents.
+ * Return 1 if found root with given gen/level and set *match to it.
+ * Return <0 if error happens
+ */
+int btrfs_find_root_search(struct btrfs_fs_info *fs_info,
+			   struct btrfs_find_root_filter *filter,
+			   struct cache_tree *result,
+			   struct cache_extent **match)
 {
-	struct btrfs_multi_bio *multi = NULL;
-	struct btrfs_device *device;
-	u64 metadata_offset = 0, metadata_size = 0;
-	off_t offset = 0;
-	off_t bytenr;
-	int fd;
-	int err;
-	int ret = 1;
-
-	printf("Super think's the tree root is at %Lu, chunk root %Lu\n",
-	       btrfs_super_root(&root->fs_info->super_copy),
-	       btrfs_super_chunk_root(&root->fs_info->super_copy));
-
-	err = btrfs_next_metadata(&root->fs_info->mapping_tree,
-				  &metadata_offset, &metadata_size);
-	if (err)
-		return ret;
+	struct extent_buffer *eb;
+	u64 chunk_offset = 0;
+	u64 chunk_size = 0;
+	u64 offset = 0;
+	u32 nodesize = btrfs_super_nodesize(fs_info->super_copy);
+	int suppress_errors = 0;
+	int ret = 0;
 
-	offset = metadata_offset;
+	suppress_errors = fs_info->suppress_check_block_errors;
+	fs_info->suppress_check_block_errors = 1;
 	while (1) {
-		u64 map_length = 4096;
-		u64 type;
-
-		if (offset >
-		    btrfs_super_total_bytes(&root->fs_info->super_copy)) {
-			printf("Went past the fs size, exiting");
+		if (filter->objectid != BTRFS_CHUNK_TREE_OBJECTID)
+			ret = btrfs_next_bg_metadata(fs_info,
+						  &chunk_offset,
+						  &chunk_size);
+		else
+			ret = btrfs_next_bg_system(fs_info,
+						&chunk_offset,
+						&chunk_size);
+		if (ret) {
+			if (ret == -ENOENT)
+				ret = 0;
 			break;
 		}
-		if (offset >= (metadata_offset + metadata_size)) {
-			err = btrfs_next_metadata(&root->fs_info->mapping_tree,
-						  &metadata_offset,
-						  &metadata_size);
-			if (err) {
-				printf("No more metdata to scan, exiting\n");
-				break;
-			}
-			offset = metadata_offset;
-		}
-		err = __btrfs_map_block(&root->fs_info->mapping_tree, READ,
-				      offset, &map_length, &type,
-				      &multi, 0, NULL);
-		if (err) {
-			offset += map_length;
-			continue;
-		}
-
-		if (!(type & BTRFS_BLOCK_GROUP_METADATA)) {
-			offset += map_length;
-			kfree(multi);
-			continue;
-		}
-
-		device = multi->stripes[0].dev;
-		fd = device->fd;
-		bytenr = multi->stripes[0].physical;
-		kfree(multi);
-
-		err = read_physical(root, fd, offset, bytenr, map_length);
-		if (!err) {
-			ret = 0;
-			break;
-		} else if (err < 0) {
-			ret = err;
-			break;
-		}
-		offset += map_length;
-	}
-	return ret;
-}
-
-int main(int argc, char **argv)
-{
-	struct btrfs_root *root;
-	int dev_fd;
-	int opt;
-	int ret;
-
-	while ((opt = getopt(argc, argv, "o:")) != -1) {
-		switch(opt) {
-			case 'o':
-				errno = 0;
-				search_objectid = (u64)strtoll(optarg, NULL,
-							       10);
-				if (errno) {
-					fprintf(stderr, "Error parsing "
-						"objectid\n");
-					exit(1);
-				}
-				break;
-			default:
-				usage();
-				exit(1);
+		for (offset = chunk_offset;
+		     offset < chunk_offset + chunk_size;
+		     offset += nodesize) {
+			eb = read_tree_block(fs_info, offset, 0);
+			if (!eb || IS_ERR(eb))
+				continue;
+			ret = add_eb_to_result(eb, result, nodesize, filter,
+					       match);
+			free_extent_buffer(eb);
+			if (ret)
+				goto out;
 		}
 	}
-
-	if (optind >= argc) {
-		usage();
-		exit(1);
-	}
-
-	dev_fd = open(argv[optind], O_RDONLY);
-	if (dev_fd < 0) {
-		fprintf(stderr, "Failed to open device %s\n", argv[optind]);
-		exit(1);
-	}
-
-	root = open_ctree_broken(dev_fd, argv[optind]);
-	close(dev_fd);
-
-	if (!root) {
-		fprintf(stderr, "Open ctree failed\n");
-		exit(1);
-	}
-
-	csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);
-	ret = find_root(root);
-	close_ctree(root);
+out:
+	fs_info->suppress_check_block_errors = suppress_errors;
 	return ret;
 }