@@ -37,249 +37,12 @@
#include "extent-cache.h"
#include "find-root.h"
-static u16 csum_size = 0;
-static u64 search_objectid = BTRFS_ROOT_TREE_OBJECTID;
-static u64 search_generation = 0;
-static unsigned long search_level = 0;
-
static void usage(void)
{
fprintf(stderr, "Usage: find-roots [-o search_objectid] "
"[ -g search_generation ] [ -l search_level ] <device>\n");
}
-static int csum_block(void *buf, u32 len)
-{
- char *result;
- u32 crc = ~(u32)0;
- 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 (memcmp(buf, result, csum_size))
- ret = 1;
- free(result);
- return ret;
-}
-
-static struct btrfs_root *open_ctree_broken(int fd, const char *device)
-{
- struct btrfs_fs_info *fs_info;
- struct btrfs_super_block *disk_super;
- struct btrfs_fs_devices *fs_devices = NULL;
- struct extent_buffer *eb;
- int ret;
-
- fs_info = btrfs_new_fs_info(0, BTRFS_SUPER_INFO_OFFSET);
- if (!fs_info) {
- fprintf(stderr, "Failed to allocate memory for fs_info\n");
- return NULL;
- }
-
- ret = btrfs_scan_fs_devices(fd, device, &fs_devices, 0, 1);
- if (ret)
- goto out;
-
- fs_info->fs_devices = fs_devices;
-
- ret = btrfs_open_devices(fs_devices, O_RDONLY);
- if (ret)
- goto out_devices;
-
- disk_super = fs_info->super_copy;
- ret = btrfs_read_dev_super(fs_devices->latest_bdev,
- disk_super, fs_info->super_bytenr, 1);
- if (ret) {
- printk("No valid btrfs found\n");
- goto out_devices;
- }
-
- memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
-
- ret = btrfs_check_fs_compatibility(disk_super, 0);
- if (ret)
- goto out_devices;
-
- ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
- if (ret)
- goto out_chunk;
-
- eb = fs_info->chunk_root->node;
- read_extent_buffer(eb, fs_info->chunk_tree_uuid,
- btrfs_header_chunk_tree_uuid(eb), BTRFS_UUID_SIZE);
-
- return fs_info->chunk_root;
-out_chunk:
- free_extent_buffer(fs_info->chunk_root->node);
- btrfs_cleanup_all_caches(fs_info);
-out_devices:
- btrfs_close_devices(fs_info->fs_devices);
-out:
- btrfs_free_fs_info(fs_info);
- return NULL;
-}
-
-static int search_iobuf(struct btrfs_root *root, void *iobuf,
- size_t iobuf_size, off_t offset)
-{
- u64 gen = search_generation;
- u64 objectid = search_objectid;
- u32 size = btrfs_super_nodesize(root->fs_info->super_copy);
- u8 level = search_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 = btrfs_stack_header_bytenr(header);
- h_owner = btrfs_stack_header_owner(header);
- h_level = header->level;
- h_gen = btrfs_stack_header_generation(header);
-
- if (h_owner != objectid)
- goto next;
- if (h_byte != (offset + block_off))
- goto next;
- if (h_level < level)
- goto next;
- level = h_level;
- 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 level %Lu\n", h_byte,
- h_gen, gen, h_level);
- goto next;
- }
- printf("Found tree root at %Lu gen %Lu level %Lu\n", h_byte,
- h_gen, h_level);
- 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)
-{
- 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;
-
- offset = metadata_offset;
- 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");
- 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;
-}
-
/*
* Get reliable generation and level for given root.
*
Since we switched to new open_ctree flag and new find-root facility, there is no need to keep the old find-root codes. Clean it up. Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com> --- btrfs-find-root.c | 237 ------------------------------------------------------ 1 file changed, 237 deletions(-)