From f1332a2ebc2ab0ce5efc1e785041aa4e6afb8fbf Mon Sep 17 00:00:00 2001 From: David Sterba Date: Fri, 25 Oct 2013 12:01:44 +0200 Subject: [PATCH] btrfs-progs: remove cmds-chunk.c Commit "btrfs-progs: separate command and implementation of chunk-recover code" moved contents of this file to chunk-recover.c but failed to remove the file cmds-chunk.c Reported-by: Mitch Harder Signed-off-by: David Sterba Signed-off-by: Chris Mason --- cmds-chunk.c | 1802 ---------------------------------------------------------- 1 file changed, 1802 deletions(-) delete mode 100644 cmds-chunk.c diff --git a/cmds-chunk.c b/cmds-chunk.c deleted file mode 100644 index 4d7fce03..00000000 --- a/cmds-chunk.c +++ /dev/null @@ -1,1802 +0,0 @@ -/* - * Copyright (C) 2013 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 - * License v2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place - Suite 330, - * Boston, MA 021110-1307, USA. - */ -#define _XOPEN_SOURCE 500 -#define _GNU_SOURCE - -#include -#include -#include -#include -#include -#include -#include -#include - -#include "kerncompat.h" -#include "list.h" -#include "radix-tree.h" -#include "ctree.h" -#include "extent-cache.h" -#include "disk-io.h" -#include "volumes.h" -#include "transaction.h" -#include "crc32c.h" -#include "utils.h" -#include "version.h" -#include "btrfsck.h" -#include "commands.h" - -#define BTRFS_CHUNK_TREE_REBUILD_ABORTED -7500 -#define BTRFS_STRIPE_LEN (64 * 1024) -#define BTRFS_NUM_MIRRORS 2 - -struct recover_control { - int verbose; - int yes; - - u16 csum_size; - u32 sectorsize; - u32 leafsize; - u64 generation; - u64 chunk_root_generation; - - struct btrfs_fs_devices *fs_devices; - - struct cache_tree chunk; - struct block_group_tree bg; - struct device_extent_tree devext; - struct cache_tree eb_cache; - - struct list_head good_chunks; - struct list_head bad_chunks; - struct list_head unrepaired_chunks; -}; - -struct extent_record { - struct cache_extent cache; - u64 generation; - u8 csum[BTRFS_CSUM_SIZE]; - struct btrfs_device *devices[BTRFS_NUM_MIRRORS]; - u64 offsets[BTRFS_NUM_MIRRORS]; - int nmirrors; -}; - -static struct extent_record *btrfs_new_extent_record(struct extent_buffer *eb) -{ - struct extent_record *rec; - - rec = malloc(sizeof(*rec)); - if (!rec) { - fprintf(stderr, "Fail to allocate memory for extent record.\n"); - exit(1); - } - - memset(rec, 0, sizeof(*rec)); - rec->cache.start = btrfs_header_bytenr(eb); - rec->cache.size = eb->len; - rec->generation = btrfs_header_generation(eb); - read_extent_buffer(eb, rec->csum, (unsigned long)btrfs_header_csum(eb), - BTRFS_CSUM_SIZE); - return rec; -} - -static int process_extent_buffer(struct cache_tree *eb_cache, - struct extent_buffer *eb, - struct btrfs_device *device, u64 offset) -{ - struct extent_record *rec; - struct extent_record *exist; - struct cache_extent *cache; - int ret = 0; - - rec = btrfs_new_extent_record(eb); - if (!rec->cache.size) - goto free_out; -again: - cache = lookup_cache_extent(eb_cache, - rec->cache.start, - rec->cache.size); - if (cache) { - exist = container_of(cache, struct extent_record, cache); - - if (exist->generation > rec->generation) - goto free_out; - if (exist->generation == rec->generation) { - if (exist->cache.start != rec->cache.start || - exist->cache.size != rec->cache.size || - memcmp(exist->csum, rec->csum, BTRFS_CSUM_SIZE)) { - ret = -EEXIST; - } else { - BUG_ON(exist->nmirrors >= BTRFS_NUM_MIRRORS); - exist->devices[exist->nmirrors] = device; - exist->offsets[exist->nmirrors] = offset; - exist->nmirrors++; - } - goto free_out; - } - remove_cache_extent(eb_cache, cache); - free(exist); - goto again; - } - - rec->devices[0] = device; - rec->offsets[0] = offset; - rec->nmirrors++; - ret = insert_cache_extent(eb_cache, &rec->cache); - BUG_ON(ret); -out: - return ret; -free_out: - free(rec); - goto out; -} - -static void free_extent_record(struct cache_extent *cache) -{ - struct extent_record *er; - - er = container_of(cache, struct extent_record, cache); - free(er); -} - -FREE_EXTENT_CACHE_BASED_TREE(extent_record, free_extent_record); - -static struct btrfs_chunk *create_chunk_item(struct chunk_record *record) -{ - struct btrfs_chunk *ret; - struct btrfs_stripe *chunk_stripe; - int i; - - if (!record || record->num_stripes == 0) - return NULL; - ret = malloc(btrfs_chunk_item_size(record->num_stripes)); - if (!ret) - return NULL; - btrfs_set_stack_chunk_length(ret, record->length); - btrfs_set_stack_chunk_owner(ret, record->owner); - btrfs_set_stack_chunk_stripe_len(ret, record->stripe_len); - btrfs_set_stack_chunk_type(ret, record->type_flags); - btrfs_set_stack_chunk_io_align(ret, record->io_align); - btrfs_set_stack_chunk_io_width(ret, record->io_width); - btrfs_set_stack_chunk_sector_size(ret, record->sector_size); - btrfs_set_stack_chunk_num_stripes(ret, record->num_stripes); - btrfs_set_stack_chunk_sub_stripes(ret, record->sub_stripes); - for (i = 0, chunk_stripe = &ret->stripe; i < record->num_stripes; - i++, chunk_stripe++) { - btrfs_set_stack_stripe_devid(chunk_stripe, - record->stripes[i].devid); - btrfs_set_stack_stripe_offset(chunk_stripe, - record->stripes[i].offset); - memcpy(chunk_stripe->dev_uuid, record->stripes[i].dev_uuid, - BTRFS_UUID_SIZE); - } - return ret; -} - -static void init_recover_control(struct recover_control *rc, int verbose, - int yes) -{ - memset(rc, 0, sizeof(struct recover_control)); - cache_tree_init(&rc->chunk); - cache_tree_init(&rc->eb_cache); - block_group_tree_init(&rc->bg); - device_extent_tree_init(&rc->devext); - - INIT_LIST_HEAD(&rc->good_chunks); - INIT_LIST_HEAD(&rc->bad_chunks); - INIT_LIST_HEAD(&rc->unrepaired_chunks); - - rc->verbose = verbose; - rc->yes = yes; -} - -static void free_recover_control(struct recover_control *rc) -{ - free_block_group_tree(&rc->bg); - free_chunk_cache_tree(&rc->chunk); - free_device_extent_tree(&rc->devext); - free_extent_record_tree(&rc->eb_cache); -} - -static int process_block_group_item(struct block_group_tree *bg_cache, - struct extent_buffer *leaf, - struct btrfs_key *key, int slot) -{ - struct block_group_record *rec; - struct block_group_record *exist; - struct cache_extent *cache; - int ret = 0; - - rec = btrfs_new_block_group_record(leaf, key, slot); - if (!rec->cache.size) - goto free_out; -again: - cache = lookup_cache_extent(&bg_cache->tree, - rec->cache.start, - rec->cache.size); - if (cache) { - exist = container_of(cache, struct block_group_record, cache); - - /*check the generation and replace if needed*/ - if (exist->generation > rec->generation) - goto free_out; - if (exist->generation == rec->generation) { - int offset = offsetof(struct block_group_record, - generation); - /* - * According to the current kernel code, the following - * case is impossble, or there is something wrong in - * the kernel code. - */ - if (memcmp(((void *)exist) + offset, - ((void *)rec) + offset, - sizeof(*rec) - offset)) - ret = -EEXIST; - goto free_out; - } - remove_cache_extent(&bg_cache->tree, cache); - list_del_init(&exist->list); - free(exist); - /* - * We must do seach again to avoid the following cache. - * /--old bg 1--//--old bg 2--/ - * /--new bg--/ - */ - goto again; - } - - ret = insert_block_group_record(bg_cache, rec); - BUG_ON(ret); -out: - return ret; -free_out: - free(rec); - goto out; -} - -static int process_chunk_item(struct cache_tree *chunk_cache, - struct extent_buffer *leaf, struct btrfs_key *key, - int slot) -{ - struct chunk_record *rec; - struct chunk_record *exist; - struct cache_extent *cache; - int ret = 0; - - rec = btrfs_new_chunk_record(leaf, key, slot); - if (!rec->cache.size) - goto free_out; -again: - cache = lookup_cache_extent(chunk_cache, rec->offset, rec->length); - if (cache) { - exist = container_of(cache, struct chunk_record, cache); - - if (exist->generation > rec->generation) - goto free_out; - if (exist->generation == rec->generation) { - int num_stripes = rec->num_stripes; - int rec_size = btrfs_chunk_record_size(num_stripes); - int offset = offsetof(struct chunk_record, generation); - - if (exist->num_stripes != rec->num_stripes || - memcmp(((void *)exist) + offset, - ((void *)rec) + offset, - rec_size - offset)) - ret = -EEXIST; - goto free_out; - } - remove_cache_extent(chunk_cache, cache); - free(exist); - goto again; - } - ret = insert_cache_extent(chunk_cache, &rec->cache); - BUG_ON(ret); -out: - return ret; -free_out: - free(rec); - goto out; -} - -static int process_device_extent_item(struct device_extent_tree *devext_cache, - struct extent_buffer *leaf, - struct btrfs_key *key, int slot) -{ - struct device_extent_record *rec; - struct device_extent_record *exist; - struct cache_extent *cache; - int ret = 0; - - rec = btrfs_new_device_extent_record(leaf, key, slot); - if (!rec->cache.size) - goto free_out; -again: - cache = lookup_cache_extent2(&devext_cache->tree, - rec->cache.objectid, - rec->cache.start, - rec->cache.size); - if (cache) { - exist = container_of(cache, struct device_extent_record, cache); - if (exist->generation > rec->generation) - goto free_out; - if (exist->generation == rec->generation) { - int offset = offsetof(struct device_extent_record, - generation); - if (memcmp(((void *)exist) + offset, - ((void *)rec) + offset, - sizeof(*rec) - offset)) - ret = -EEXIST; - goto free_out; - } - remove_cache_extent(&devext_cache->tree, cache); - list_del_init(&exist->chunk_list); - list_del_init(&exist->device_list); - free(exist); - goto again; - } - - ret = insert_device_extent_record(devext_cache, rec); - BUG_ON(ret); -out: - return ret; -free_out: - free(rec); - goto out; -} - -static void print_block_group_info(struct block_group_record *rec, char *prefix) -{ - if (prefix) - printf("%s", prefix); - printf("Block Group: start = %llu, len = %llu, flag = %llx\n", - rec->objectid, rec->offset, rec->flags); -} - -static void print_block_group_tree(struct block_group_tree *tree) -{ - struct cache_extent *cache; - struct block_group_record *rec; - - printf("All Block Groups:\n"); - for (cache = first_cache_extent(&tree->tree); cache; - cache = next_cache_extent(cache)) { - rec = container_of(cache, struct block_group_record, cache); - print_block_group_info(rec, "\t"); - } - printf("\n"); -} - -static void print_stripe_info(struct stripe *data, char *prefix1, char *prefix2, - int index) -{ - if (prefix1) - printf("%s", prefix1); - if (prefix2) - printf("%s", prefix2); - printf("[%2d] Stripe: devid = %llu, offset = %llu\n", - index, data->devid, data->offset); -} - -static void print_chunk_self_info(struct chunk_record *rec, char *prefix) -{ - int i; - - if (prefix) - printf("%s", prefix); - printf("Chunk: start = %llu, len = %llu, type = %llx, num_stripes = %u\n", - rec->offset, rec->length, rec->type_flags, rec->num_stripes); - if (prefix) - printf("%s", prefix); - printf(" Stripes list:\n"); - for (i = 0; i < rec->num_stripes; i++) - print_stripe_info(&rec->stripes[i], prefix, " ", i); -} - -static void print_chunk_tree(struct cache_tree *tree) -{ - struct cache_extent *n; - struct chunk_record *entry; - - printf("All Chunks:\n"); - for (n = first_cache_extent(tree); n; - n = next_cache_extent(n)) { - entry = container_of(n, struct chunk_record, cache); - print_chunk_self_info(entry, "\t"); - } - printf("\n"); -} - -static void print_device_extent_info(struct device_extent_record *rec, - char *prefix) -{ - if (prefix) - printf("%s", prefix); - printf("Device extent: devid = %llu, start = %llu, len = %llu, chunk offset = %llu\n", - rec->objectid, rec->offset, rec->length, rec->chunk_offset); -} - -static void print_device_extent_tree(struct device_extent_tree *tree) -{ - struct cache_extent *n; - struct device_extent_record *entry; - - printf("All Device Extents:\n"); - for (n = first_cache_extent(&tree->tree); n; - n = next_cache_extent(n)) { - entry = container_of(n, struct device_extent_record, cache); - print_device_extent_info(entry, "\t"); - } - printf("\n"); -} - -static void print_device_info(struct btrfs_device *device, char *prefix) -{ - if (prefix) - printf("%s", prefix); - printf("Device: id = %llu, name = %s\n", - device->devid, device->name); -} - -static void print_all_devices(struct list_head *devices) -{ - struct btrfs_device *dev; - - printf("All Devices:\n"); - list_for_each_entry(dev, devices, dev_list) - print_device_info(dev, "\t"); - printf("\n"); -} - -static void print_scan_result(struct recover_control *rc) -{ - if (!rc->verbose) - return; - - printf("DEVICE SCAN RESULT:\n"); - printf("Filesystem Information:\n"); - printf("\tsectorsize: %d\n", rc->sectorsize); - printf("\tleafsize: %d\n", rc->leafsize); - printf("\ttree root generation: %llu\n", rc->generation); - printf("\tchunk root generation: %llu\n", rc->chunk_root_generation); - printf("\n"); - - print_all_devices(&rc->fs_devices->devices); - print_block_group_tree(&rc->bg); - print_chunk_tree(&rc->chunk); - print_device_extent_tree(&rc->devext); -} - -static void print_chunk_info(struct chunk_record *chunk, char *prefix) -{ - struct device_extent_record *devext; - int i; - - print_chunk_self_info(chunk, prefix); - if (prefix) - printf("%s", prefix); - if (chunk->bg_rec) - print_block_group_info(chunk->bg_rec, " "); - else - printf(" No block group.\n"); - if (prefix) - printf("%s", prefix); - if (list_empty(&chunk->dextents)) { - printf(" No device extent.\n"); - } else { - printf(" Device extent list:\n"); - i = 0; - list_for_each_entry(devext, &chunk->dextents, chunk_list) { - if (prefix) - printf("%s", prefix); - printf("%s[%2d]", " ", i); - print_device_extent_info(devext, NULL); - i++; - } - } -} - -static void print_check_result(struct recover_control *rc) -{ - struct chunk_record *chunk; - struct block_group_record *bg; - struct device_extent_record *devext; - int total = 0; - int good = 0; - int bad = 0; - - if (!rc->verbose) - return; - - printf("CHECK RESULT:\n"); - printf("Healthy Chunks:\n"); - list_for_each_entry(chunk, &rc->good_chunks, list) { - print_chunk_info(chunk, " "); - good++; - total++; - } - printf("Bad Chunks:\n"); - list_for_each_entry(chunk, &rc->bad_chunks, list) { - print_chunk_info(chunk, " "); - bad++; - total++; - } - printf("\n"); - printf("Total Chunks:\t%d\n", total); - printf(" Heathy:\t%d\n", good); - printf(" Bad:\t%d\n", bad); - - printf("\n"); - printf("Orphan Block Groups:\n"); - list_for_each_entry(bg, &rc->bg.block_groups, list) - print_block_group_info(bg, " "); - - printf("\n"); - printf("Orphan Device Extents:\n"); - list_for_each_entry(devext, &rc->devext.no_chunk_orphans, chunk_list) - print_device_extent_info(devext, " "); -} - -static int check_chunk_by_metadata(struct recover_control *rc, - struct btrfs_root *root, - struct chunk_record *chunk, int bg_only) -{ - int ret; - int i; - int slot; - struct btrfs_path path; - struct btrfs_key key; - struct btrfs_root *dev_root; - struct stripe *stripe; - struct btrfs_dev_extent *dev_extent; - struct btrfs_block_group_item *bg_ptr; - struct extent_buffer *l; - - btrfs_init_path(&path); - - if (bg_only) - goto bg_check; - - dev_root = root->fs_info->dev_root; - for (i = 0; i < chunk->num_stripes; i++) { - stripe = &chunk->stripes[i]; - - key.objectid = stripe->devid; - key.offset = stripe->offset; - key.type = BTRFS_DEV_EXTENT_KEY; - - ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0); - if (ret < 0) { - fprintf(stderr, "Search device extent failed(%d)\n", - ret); - btrfs_release_path(&path); - return ret; - } else if (ret > 0) { - if (rc->verbose) - fprintf(stderr, - "No device extent[%llu, %llu]\n", - stripe->devid, stripe->offset); - btrfs_release_path(&path); - return -ENOENT; - } - l = path.nodes[0]; - slot = path.slots[0]; - dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent); - if (chunk->offset != - btrfs_dev_extent_chunk_offset(l, dev_extent)) { - if (rc->verbose) - fprintf(stderr, - "Device tree unmatch with chunks dev_extent[%llu, %llu], chunk[%llu, %llu]\n", - btrfs_dev_extent_chunk_offset(l, - dev_extent), - btrfs_dev_extent_length(l, dev_extent), - chunk->offset, chunk->length); - btrfs_release_path(&path); - return -ENOENT; - } - btrfs_release_path(&path); - } - -bg_check: - key.objectid = chunk->offset; - key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; - key.offset = chunk->length; - - ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, &path, - 0, 0); - if (ret < 0) { - fprintf(stderr, "Search block group failed(%d)\n", ret); - btrfs_release_path(&path); - return ret; - } else if (ret > 0) { - if (rc->verbose) - fprintf(stderr, "No block group[%llu, %llu]\n", - key.objectid, key.offset); - btrfs_release_path(&path); - return -ENOENT; - } - - l = path.nodes[0]; - slot = path.slots[0]; - bg_ptr = btrfs_item_ptr(l, slot, struct btrfs_block_group_item); - if (chunk->type_flags != btrfs_disk_block_group_flags(l, bg_ptr)) { - if (rc->verbose) - fprintf(stderr, - "Chunk[%llu, %llu]'s type(%llu) is differemt with Block Group's type(%llu)\n", - chunk->offset, chunk->length, chunk->type_flags, - btrfs_disk_block_group_flags(l, bg_ptr)); - btrfs_release_path(&path); - return -ENOENT; - } - btrfs_release_path(&path); - return 0; -} - -static int check_all_chunks_by_metadata(struct recover_control *rc, - struct btrfs_root *root) -{ - struct chunk_record *chunk; - struct chunk_record *next; - LIST_HEAD(orphan_chunks); - int ret = 0; - int err; - - list_for_each_entry_safe(chunk, next, &rc->good_chunks, list) { - err = check_chunk_by_metadata(rc, root, chunk, 0); - if (err) { - if (err == -ENOENT) - list_move_tail(&chunk->list, &orphan_chunks); - else if (err && !ret) - ret = err; - } - } - - list_for_each_entry_safe(chunk, next, &rc->unrepaired_chunks, list) { - err = check_chunk_by_metadata(rc, root, chunk, 1); - if (err == -ENOENT) - list_move_tail(&chunk->list, &orphan_chunks); - else if (err && !ret) - ret = err; - } - - list_for_each_entry(chunk, &rc->bad_chunks, list) { - err = check_chunk_by_metadata(rc, root, chunk, 1); - if (err != -ENOENT && !ret) - ret = err ? err : -EINVAL; - } - list_splice(&orphan_chunks, &rc->bad_chunks); - return ret; -} - -static int extract_metadata_record(struct recover_control *rc, - struct extent_buffer *leaf) -{ - struct btrfs_key key; - int ret = 0; - int i; - u32 nritems; - - nritems = btrfs_header_nritems(leaf); - for (i = 0; i < nritems; i++) { - btrfs_item_key_to_cpu(leaf, &key, i); - switch (key.type) { - case BTRFS_BLOCK_GROUP_ITEM_KEY: - ret = process_block_group_item(&rc->bg, leaf, &key, i); - break; - case BTRFS_CHUNK_ITEM_KEY: - ret = process_chunk_item(&rc->chunk, leaf, &key, i); - break; - case BTRFS_DEV_EXTENT_KEY: - ret = process_device_extent_item(&rc->devext, leaf, - &key, i); - break; - } - if (ret) - break; - } - return ret; -} - -static inline int is_super_block_address(u64 offset) -{ - int i; - - for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { - if (offset == btrfs_sb_offset(i)) - return 1; - } - return 0; -} - -static int scan_one_device(struct recover_control *rc, int fd, - struct btrfs_device *device) -{ - struct extent_buffer *buf; - u64 bytenr; - int ret = 0; - - buf = malloc(sizeof(*buf) + rc->leafsize); - if (!buf) - return -ENOMEM; - buf->len = rc->leafsize; - - bytenr = 0; - while (1) { - if (is_super_block_address(bytenr)) - bytenr += rc->sectorsize; - - if (pread64(fd, buf->data, rc->leafsize, bytenr) < - rc->leafsize) - break; - - if (memcmp_extent_buffer(buf, rc->fs_devices->fsid, - btrfs_header_fsid(), BTRFS_FSID_SIZE)) { - bytenr += rc->sectorsize; - continue; - } - - if (verify_tree_block_csum_silent(buf, rc->csum_size)) { - bytenr += rc->sectorsize; - continue; - } - - ret = process_extent_buffer(&rc->eb_cache, buf, device, bytenr); - if (ret) - goto out; - - if (btrfs_header_level(buf) != 0) - goto next_node; - - switch (btrfs_header_owner(buf)) { - case BTRFS_EXTENT_TREE_OBJECTID: - case BTRFS_DEV_TREE_OBJECTID: - /* different tree use different generation */ - if (btrfs_header_generation(buf) > rc->generation) - break; - ret = extract_metadata_record(rc, buf); - if (ret) - goto out; - break; - case BTRFS_CHUNK_TREE_OBJECTID: - if (btrfs_header_generation(buf) > - rc->chunk_root_generation) - break; - ret = extract_metadata_record(rc, buf); - if (ret) - goto out; - break; - } -next_node: - bytenr += rc->leafsize; - } -out: - free(buf); - return ret; -} - -static int scan_devices(struct recover_control *rc) -{ - int ret = 0; - int fd; - struct btrfs_device *dev; - int e; - - list_for_each_entry(dev, &rc->fs_devices->devices, dev_list) { - fd = open(dev->name, O_RDONLY); - if (fd < 0) { - e = errno; - fprintf(stderr, "Failed to open device %s\n", - dev->name); - return -e; - } - ret = scan_one_device(rc, fd, dev); - close(fd); - if (ret) - return ret; - } - return ret; -} - -static int build_device_map_by_chunk_record(struct btrfs_root *root, - struct chunk_record *chunk) -{ - int ret = 0; - int i; - u64 devid; - u8 uuid[BTRFS_UUID_SIZE]; - u16 num_stripes; - struct btrfs_mapping_tree *map_tree; - struct map_lookup *map; - struct stripe *stripe; - - map_tree = &root->fs_info->mapping_tree; - num_stripes = chunk->num_stripes; - map = malloc(btrfs_map_lookup_size(num_stripes)); - if (!map) - return -ENOMEM; - map->ce.start = chunk->offset; - map->ce.size = chunk->length; - map->num_stripes = num_stripes; - map->io_width = chunk->io_width; - map->io_align = chunk->io_align; - map->sector_size = chunk->sector_size; - map->stripe_len = chunk->stripe_len; - map->type = chunk->type_flags; - map->sub_stripes = chunk->sub_stripes; - - for (i = 0, stripe = chunk->stripes; i < num_stripes; i++, stripe++) { - devid = stripe->devid; - memcpy(uuid, stripe->dev_uuid, BTRFS_UUID_SIZE); - map->stripes[i].physical = stripe->offset; - map->stripes[i].dev = btrfs_find_device(root, devid, - uuid, NULL); - if (!map->stripes[i].dev) { - kfree(map); - return -EIO; - } - } - - ret = insert_cache_extent(&map_tree->cache_tree, &map->ce); - return ret; -} - -static int build_device_maps_by_chunk_records(struct recover_control *rc, - struct btrfs_root *root) -{ - int ret = 0; - struct chunk_record *chunk; - - list_for_each_entry(chunk, &rc->good_chunks, list) { - ret = build_device_map_by_chunk_record(root, chunk); - if (ret) - return ret; - } - return ret; -} - -static int block_group_remove_all_extent_items(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct block_group_record *bg) -{ - struct btrfs_fs_info *fs_info = root->fs_info; - struct btrfs_key key; - struct btrfs_path path; - struct extent_buffer *leaf; - u64 start = bg->objectid; - u64 end = bg->objectid + bg->offset; - u64 old_val; - int nitems; - int ret; - int i; - int del_s, del_nr; - - btrfs_init_path(&path); - root = root->fs_info->extent_root; - - key.objectid = start; - key.offset = 0; - key.type = BTRFS_EXTENT_ITEM_KEY; -again: - ret = btrfs_search_slot(trans, root, &key, &path, -1, 1); - if (ret < 0) - goto err; - else if (ret > 0) - ret = 0; - - leaf = path.nodes[0]; - nitems = btrfs_header_nritems(leaf); - if (!nitems) { - /* The tree is empty. */ - ret = 0; - goto err; - } - - if (path.slots[0] >= nitems) { - ret = btrfs_next_leaf(root, &path); - if (ret < 0) - goto err; - if (ret > 0) { - ret = 0; - goto err; - } - leaf = path.nodes[0]; - btrfs_item_key_to_cpu(leaf, &key, 0); - if (key.objectid >= end) - goto err; - btrfs_release_path(&path); - goto again; - } - - del_nr = 0; - del_s = -1; - for (i = path.slots[0]; i < nitems; i++) { - btrfs_item_key_to_cpu(leaf, &key, i); - if (key.objectid >= end) - break; - - if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { - if (del_nr == 0) - continue; - else - break; - } - - if (del_s == -1) - del_s = i; - del_nr++; - if (key.type == BTRFS_EXTENT_ITEM_KEY || - key.type == BTRFS_METADATA_ITEM_KEY) { - old_val = btrfs_super_bytes_used(fs_info->super_copy); - if (key.type == BTRFS_METADATA_ITEM_KEY) - old_val += root->leafsize; - else - old_val += key.offset; - btrfs_set_super_bytes_used(fs_info->super_copy, - old_val); - } - } - - if (del_nr) { - ret = btrfs_del_items(trans, root, &path, del_s, del_nr); - if (ret) - goto err; - } - - if (key.objectid < end) { - if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { - key.objectid += root->sectorsize; - key.type = BTRFS_EXTENT_ITEM_KEY; - key.offset = 0; - } - btrfs_release_path(&path); - goto again; - } -err: - btrfs_release_path(&path); - return ret; -} - -static int block_group_free_all_extent(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - struct block_group_record *bg) -{ - struct btrfs_block_group_cache *cache; - struct btrfs_fs_info *info; - u64 start; - u64 end; - - info = root->fs_info; - cache = btrfs_lookup_block_group(info, bg->objectid); - if (!cache) - return -ENOENT; - - start = cache->key.objectid; - end = start + cache->key.offset - 1; - - set_extent_bits(&info->block_group_cache, start, end, - BLOCK_GROUP_DIRTY, GFP_NOFS); - set_extent_dirty(&info->free_space_cache, start, end, GFP_NOFS); - - btrfs_set_block_group_used(&cache->item, 0); - - return 0; -} - -static int remove_chunk_extent_item(struct btrfs_trans_handle *trans, - struct recover_control *rc, - struct btrfs_root *root) -{ - struct chunk_record *chunk; - int ret = 0; - - list_for_each_entry(chunk, &rc->good_chunks, list) { - if (!(chunk->type_flags & BTRFS_BLOCK_GROUP_SYSTEM)) - continue; - ret = block_group_remove_all_extent_items(trans, root, - chunk->bg_rec); - if (ret) - return ret; - - ret = block_group_free_all_extent(trans, root, chunk->bg_rec); - if (ret) - return ret; - } - return ret; -} - -static int __rebuild_chunk_root(struct btrfs_trans_handle *trans, - struct recover_control *rc, - struct btrfs_root *root) -{ - u64 min_devid = -1; - struct btrfs_device *dev; - struct extent_buffer *cow; - struct btrfs_disk_key disk_key; - int ret = 0; - - list_for_each_entry(dev, &rc->fs_devices->devices, dev_list) { - if (min_devid > dev->devid) - min_devid = dev->devid; - } - btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID); - btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY); - btrfs_set_disk_key_offset(&disk_key, min_devid); - - cow = btrfs_alloc_free_block(trans, root, root->sectorsize, - BTRFS_CHUNK_TREE_OBJECTID, - &disk_key, 0, 0, 0); - btrfs_set_header_bytenr(cow, cow->start); - btrfs_set_header_generation(cow, trans->transid); - btrfs_set_header_nritems(cow, 0); - btrfs_set_header_level(cow, 0); - btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV); - btrfs_set_header_owner(cow, BTRFS_CHUNK_TREE_OBJECTID); - write_extent_buffer(cow, root->fs_info->fsid, - btrfs_header_fsid(), BTRFS_FSID_SIZE); - - write_extent_buffer(cow, root->fs_info->chunk_tree_uuid, - (unsigned long)btrfs_header_chunk_tree_uuid(cow), - BTRFS_UUID_SIZE); - - root->node = cow; - btrfs_mark_buffer_dirty(cow); - - return ret; -} - -static int __rebuild_device_items(struct btrfs_trans_handle *trans, - struct recover_control *rc, - struct btrfs_root *root) -{ - struct btrfs_device *dev; - struct btrfs_key key; - struct btrfs_dev_item *dev_item; - int ret = 0; - - dev_item = malloc(sizeof(struct btrfs_dev_item)); - if (!dev_item) - return -ENOMEM; - - list_for_each_entry(dev, &rc->fs_devices->devices, dev_list) { - key.objectid = BTRFS_DEV_ITEMS_OBJECTID; - key.type = BTRFS_DEV_ITEM_KEY; - key.offset = dev->devid; - - btrfs_set_stack_device_generation(dev_item, 0); - btrfs_set_stack_device_type(dev_item, dev->type); - btrfs_set_stack_device_id(dev_item, dev->devid); - btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); - btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); - btrfs_set_stack_device_io_align(dev_item, dev->io_align); - btrfs_set_stack_device_io_width(dev_item, dev->io_width); - btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); - memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); - memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); - - ret = btrfs_insert_item(trans, root, &key, - dev_item, sizeof(*dev_item)); - } - - free(dev_item); - return ret; -} - -static int __rebuild_chunk_items(struct btrfs_trans_handle *trans, - struct recover_control *rc, - struct btrfs_root *root) -{ - struct btrfs_key key; - struct btrfs_chunk *chunk = NULL; - struct btrfs_root *chunk_root; - struct chunk_record *chunk_rec; - int ret; - - chunk_root = root->fs_info->chunk_root; - - list_for_each_entry(chunk_rec, &rc->good_chunks, list) { - chunk = create_chunk_item(chunk_rec); - if (!chunk) - return -ENOMEM; - - key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; - key.type = BTRFS_CHUNK_ITEM_KEY; - key.offset = chunk_rec->offset; - - ret = btrfs_insert_item(trans, chunk_root, &key, chunk, - btrfs_chunk_item_size(chunk_rec->num_stripes)); - free(chunk); - if (ret) - return ret; - } - return 0; -} - -static int rebuild_chunk_tree(struct btrfs_trans_handle *trans, - struct recover_control *rc, - struct btrfs_root *root) -{ - int ret = 0; - - root = root->fs_info->chunk_root; - - ret = __rebuild_chunk_root(trans, rc, root); - if (ret) - return ret; - - ret = __rebuild_device_items(trans, rc, root); - if (ret) - return ret; - - ret = __rebuild_chunk_items(trans, rc, root); - - return ret; -} - -static int rebuild_sys_array(struct recover_control *rc, - struct btrfs_root *root) -{ - struct btrfs_chunk *chunk; - struct btrfs_key key; - struct chunk_record *chunk_rec; - int ret = 0; - u16 num_stripes; - - btrfs_set_super_sys_array_size(root->fs_info->super_copy, 0); - - list_for_each_entry(chunk_rec, &rc->good_chunks, list) { - if (!(chunk_rec->type_flags & BTRFS_BLOCK_GROUP_SYSTEM)) - continue; - - num_stripes = chunk_rec->num_stripes; - chunk = create_chunk_item(chunk_rec); - if (!chunk) { - ret = -ENOMEM; - break; - } - - key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; - key.type = BTRFS_CHUNK_ITEM_KEY; - key.offset = chunk_rec->offset; - - ret = btrfs_add_system_chunk(NULL, root, &key, chunk, - btrfs_chunk_item_size(num_stripes)); - free(chunk); - if (ret) - break; - } - return ret; - -} - -static struct btrfs_root * -open_ctree_with_broken_chunk(struct recover_control *rc) -{ - struct btrfs_fs_info *fs_info; - struct btrfs_super_block *disk_super; - struct extent_buffer *eb; - u32 sectorsize; - u32 nodesize; - u32 leafsize; - u32 stripesize; - int ret; - - fs_info = btrfs_new_fs_info(1, BTRFS_SUPER_INFO_OFFSET); - if (!fs_info) { - fprintf(stderr, "Failed to allocate memory for fs_info\n"); - return ERR_PTR(-ENOMEM); - } - - fs_info->fs_devices = rc->fs_devices; - ret = btrfs_open_devices(fs_info->fs_devices, O_RDWR); - if (ret) - goto out; - - disk_super = fs_info->super_copy; - ret = btrfs_read_dev_super(fs_info->fs_devices->latest_bdev, - disk_super, fs_info->super_bytenr); - if (ret) { - fprintf(stderr, "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, 1); - if (ret) - goto out_devices; - - nodesize = btrfs_super_nodesize(disk_super); - leafsize = btrfs_super_leafsize(disk_super); - sectorsize = btrfs_super_sectorsize(disk_super); - stripesize = btrfs_super_stripesize(disk_super); - - __setup_root(nodesize, leafsize, sectorsize, stripesize, - fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); - - ret = build_device_maps_by_chunk_records(rc, fs_info->chunk_root); - if (ret) - goto out_cleanup; - - ret = btrfs_setup_all_roots(fs_info, 0, 0, 0); - if (ret) - goto out_failed; - - eb = fs_info->tree_root->node; - read_extent_buffer(eb, fs_info->chunk_tree_uuid, - (unsigned long)btrfs_header_chunk_tree_uuid(eb), - BTRFS_UUID_SIZE); - - return fs_info->fs_root; -out_failed: - btrfs_release_all_roots(fs_info); -out_cleanup: - btrfs_cleanup_all_caches(fs_info); -out_devices: - btrfs_close_devices(fs_info->fs_devices); -out: - btrfs_free_fs_info(fs_info); - return ERR_PTR(ret); -} - -static int recover_prepare(struct recover_control *rc, char *path) -{ - int ret; - int fd; - struct btrfs_super_block *sb; - struct btrfs_fs_devices *fs_devices; - - ret = 0; - fd = open(path, O_RDONLY); - if (fd < 0) { - fprintf(stderr, "open %s\n error.\n", path); - return -1; - } - - sb = malloc(sizeof(struct btrfs_super_block)); - if (!sb) { - fprintf(stderr, "allocating memory for sb failed.\n"); - ret = -ENOMEM; - goto fail_close_fd; - } - - ret = btrfs_read_dev_super(fd, sb, BTRFS_SUPER_INFO_OFFSET); - if (ret) { - fprintf(stderr, "read super block error\n"); - goto fail_free_sb; - } - - rc->sectorsize = btrfs_super_sectorsize(sb); - rc->leafsize = btrfs_super_leafsize(sb); - rc->generation = btrfs_super_generation(sb); - rc->chunk_root_generation = btrfs_super_chunk_root_generation(sb); - rc->csum_size = btrfs_super_csum_size(sb); - - /* if seed, the result of scanning below will be partial */ - if (btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_SEEDING) { - fprintf(stderr, "this device is seed device\n"); - ret = -1; - goto fail_free_sb; - } - - ret = btrfs_scan_fs_devices(fd, path, &fs_devices, 0); - if (ret) - goto fail_free_sb; - - rc->fs_devices = fs_devices; - - if (rc->verbose) - print_all_devices(&rc->fs_devices->devices); - -fail_free_sb: - free(sb); -fail_close_fd: - close(fd); - return ret; -} - -/* - * This reads a line from the stdin and only returns non-zero if the - * first whitespace delimited token is a case insensitive match with yes - * or y. - */ -static int ask_user(char *question) -{ - char buf[30] = {0,}; - char *saveptr = NULL; - char *answer; - - printf("%s [y/N]: ", question); - - return fgets(buf, sizeof(buf) - 1, stdin) && - (answer = strtok_r(buf, " \t\n\r", &saveptr)) && - (!strcasecmp(answer, "yes") || !strcasecmp(answer, "y")); -} - -static int btrfs_get_device_extents(u64 chunk_object, - struct list_head *orphan_devexts, - struct list_head *ret_list) -{ - struct device_extent_record *devext; - struct device_extent_record *next; - int count = 0; - - list_for_each_entry_safe(devext, next, orphan_devexts, chunk_list) { - if (devext->chunk_offset == chunk_object) { - list_move_tail(&devext->chunk_list, ret_list); - count++; - } - } - return count; -} - -static int calc_num_stripes(u64 type) -{ - if (type & (BTRFS_BLOCK_GROUP_RAID0 | - BTRFS_BLOCK_GROUP_RAID10 | - BTRFS_BLOCK_GROUP_RAID5 | - BTRFS_BLOCK_GROUP_RAID6)) - return 0; - else if (type & (BTRFS_BLOCK_GROUP_RAID1 | - BTRFS_BLOCK_GROUP_DUP)) - return 2; - else - return 1; -} - -static inline int calc_sub_nstripes(u64 type) -{ - if (type & BTRFS_BLOCK_GROUP_RAID10) - return 2; - else - return 1; -} - -static int btrfs_verify_device_extents(struct block_group_record *bg, - struct list_head *devexts, int ndevexts) -{ - struct device_extent_record *devext; - u64 strpie_length; - int expected_num_stripes; - - expected_num_stripes = calc_num_stripes(bg->flags); - if (expected_num_stripes && expected_num_stripes != ndevexts) - return 1; - - strpie_length = calc_stripe_length(bg->flags, bg->offset, ndevexts); - list_for_each_entry(devext, devexts, chunk_list) { - if (devext->length != strpie_length) - return 1; - } - return 0; -} - -static int btrfs_rebuild_unordered_chunk_stripes(struct recover_control *rc, - struct chunk_record *chunk) -{ - struct device_extent_record *devext; - struct btrfs_device *device; - int i; - - devext = list_first_entry(&chunk->dextents, struct device_extent_record, - chunk_list); - for (i = 0; i < chunk->num_stripes; i++) { - chunk->stripes[i].devid = devext->objectid; - chunk->stripes[i].offset = devext->offset; - device = btrfs_find_device_by_devid(rc->fs_devices, - devext->objectid, - 0); - if (!device) - return -ENOENT; - BUG_ON(btrfs_find_device_by_devid(rc->fs_devices, - devext->objectid, - 1)); - memcpy(chunk->stripes[i].dev_uuid, device->uuid, - BTRFS_UUID_SIZE); - devext = list_next_entry(devext, chunk_list); - } - return 0; -} - -static int btrfs_calc_stripe_index(struct chunk_record *chunk, u64 logical) -{ - u64 offset = logical - chunk->offset; - int stripe_nr; - int nr_data_stripes; - int index; - - stripe_nr = offset / chunk->stripe_len; - if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID0) { - index = stripe_nr % chunk->num_stripes; - } else if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID10) { - index = stripe_nr % (chunk->num_stripes / chunk->sub_stripes); - index *= chunk->sub_stripes; - } else if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID5) { - nr_data_stripes = chunk->num_stripes - 1; - index = stripe_nr % nr_data_stripes; - stripe_nr /= nr_data_stripes; - index = (index + stripe_nr) % chunk->num_stripes; - } else if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID6) { - nr_data_stripes = chunk->num_stripes - 2; - index = stripe_nr % nr_data_stripes; - stripe_nr /= nr_data_stripes; - index = (index + stripe_nr) % chunk->num_stripes; - } else { - BUG_ON(1); - } - return index; -} - -/* calc the logical offset which is the start of the next stripe. */ -static inline u64 btrfs_next_stripe_logical_offset(struct chunk_record *chunk, - u64 logical) -{ - u64 offset = logical - chunk->offset; - - offset /= chunk->stripe_len; - offset *= chunk->stripe_len; - offset += chunk->stripe_len; - - return offset + chunk->offset; -} - -static int is_extent_record_in_device_extent(struct extent_record *er, - struct device_extent_record *dext, - int *mirror) -{ - int i; - - for (i = 0; i < er->nmirrors; i++) { - if (er->devices[i]->devid == dext->objectid && - er->offsets[i] >= dext->offset && - er->offsets[i] < dext->offset + dext->length) { - *mirror = i; - return 1; - } - } - return 0; -} - -static int -btrfs_rebuild_ordered_meta_chunk_stripes(struct recover_control *rc, - struct chunk_record *chunk) -{ - u64 start = chunk->offset; - u64 end = chunk->offset + chunk->length; - struct cache_extent *cache; - struct extent_record *er; - struct device_extent_record *devext; - struct device_extent_record *next; - struct btrfs_device *device; - LIST_HEAD(devexts); - int index; - int mirror; - int ret; - - cache = lookup_cache_extent(&rc->eb_cache, - start, chunk->length); - if (!cache) { - /* No used space, we can reorder the stripes freely. */ - ret = btrfs_rebuild_unordered_chunk_stripes(rc, chunk); - return ret; - } - - list_splice_init(&chunk->dextents, &devexts); -again: - er = container_of(cache, struct extent_record, cache); - index = btrfs_calc_stripe_index(chunk, er->cache.start); - if (chunk->stripes[index].devid) - goto next; - list_for_each_entry_safe(devext, next, &devexts, chunk_list) { - if (is_extent_record_in_device_extent(er, devext, &mirror)) { - chunk->stripes[index].devid = devext->objectid; - chunk->stripes[index].offset = devext->offset; - memcpy(chunk->stripes[index].dev_uuid, - er->devices[mirror]->uuid, - BTRFS_UUID_SIZE); - index++; - list_move(&devext->chunk_list, &chunk->dextents); - } - } -next: - start = btrfs_next_stripe_logical_offset(chunk, er->cache.start); - if (start >= end) - goto no_extent_record; - - cache = lookup_cache_extent(&rc->eb_cache, start, end - start); - if (cache) - goto again; -no_extent_record: - if (list_empty(&devexts)) - return 0; - - if (chunk->type_flags & (BTRFS_BLOCK_GROUP_RAID5 | - BTRFS_BLOCK_GROUP_RAID6)) { - /* Fixme: try to recover the order by the parity block. */ - list_splice_tail(&devexts, &chunk->dextents); - return -EINVAL; - } - - /* There is no data on the lost stripes, we can reorder them freely. */ - for (index = 0; index < chunk->num_stripes; index++) { - if (chunk->stripes[index].devid) - continue; - - devext = list_first_entry(&devexts, - struct device_extent_record, - chunk_list); - list_move(&devext->chunk_list, &chunk->dextents); - - chunk->stripes[index].devid = devext->objectid; - chunk->stripes[index].offset = devext->offset; - device = btrfs_find_device_by_devid(rc->fs_devices, - devext->objectid, - 0); - if (!device) { - list_splice_tail(&devexts, &chunk->dextents); - return -EINVAL; - } - BUG_ON(btrfs_find_device_by_devid(rc->fs_devices, - devext->objectid, - 1)); - memcpy(chunk->stripes[index].dev_uuid, device->uuid, - BTRFS_UUID_SIZE); - } - return 0; -} - -#define BTRFS_ORDERED_RAID (BTRFS_BLOCK_GROUP_RAID0 | \ - BTRFS_BLOCK_GROUP_RAID10 | \ - BTRFS_BLOCK_GROUP_RAID5 | \ - BTRFS_BLOCK_GROUP_RAID6) - -static int btrfs_rebuild_chunk_stripes(struct recover_control *rc, - struct chunk_record *chunk) -{ - int ret; - - /* - * All the data in the system metadata chunk will be dropped, - * so we need not guarantee that the data is right or not, that - * is we can reorder the stripes in the system metadata chunk. - */ - if ((chunk->type_flags & BTRFS_BLOCK_GROUP_METADATA) && - (chunk->type_flags & BTRFS_ORDERED_RAID)) - ret =btrfs_rebuild_ordered_meta_chunk_stripes(rc, chunk); - else if ((chunk->type_flags & BTRFS_BLOCK_GROUP_DATA) && - (chunk->type_flags & BTRFS_ORDERED_RAID)) - ret = 1; /* Be handled after the fs is opened. */ - else - ret = btrfs_rebuild_unordered_chunk_stripes(rc, chunk); - - return ret; -} - -static int btrfs_recover_chunks(struct recover_control *rc) -{ - struct chunk_record *chunk; - struct block_group_record *bg; - struct block_group_record *next; - LIST_HEAD(new_chunks); - LIST_HEAD(devexts); - int nstripes; - int ret; - - /* create the chunk by block group */ - list_for_each_entry_safe(bg, next, &rc->bg.block_groups, list) { - nstripes = btrfs_get_device_extents(bg->objectid, - &rc->devext.no_chunk_orphans, - &devexts); - chunk = malloc(btrfs_chunk_record_size(nstripes)); - if (!chunk) - return -ENOMEM; - memset(chunk, 0, btrfs_chunk_record_size(nstripes)); - INIT_LIST_HEAD(&chunk->dextents); - chunk->bg_rec = bg; - chunk->cache.start = bg->objectid; - chunk->cache.size = bg->offset; - chunk->objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; - chunk->type = BTRFS_CHUNK_ITEM_KEY; - chunk->offset = bg->objectid; - chunk->generation = bg->generation; - chunk->length = bg->offset; - chunk->owner = BTRFS_CHUNK_TREE_OBJECTID; - chunk->stripe_len = BTRFS_STRIPE_LEN; - chunk->type_flags = bg->flags; - chunk->io_width = BTRFS_STRIPE_LEN; - chunk->io_align = BTRFS_STRIPE_LEN; - chunk->sector_size = rc->sectorsize; - chunk->sub_stripes = calc_sub_nstripes(bg->flags); - - ret = insert_cache_extent(&rc->chunk, &chunk->cache); - BUG_ON(ret); - - if (!nstripes) { - list_add_tail(&chunk->list, &rc->bad_chunks); - continue; - } - - list_splice_init(&devexts, &chunk->dextents); - - ret = btrfs_verify_device_extents(bg, &devexts, nstripes); - if (ret) { - list_add_tail(&chunk->list, &rc->bad_chunks); - continue; - } - - chunk->num_stripes = nstripes; - ret = btrfs_rebuild_chunk_stripes(rc, chunk); - if (ret > 0) - list_add_tail(&chunk->list, &rc->unrepaired_chunks); - else if (ret < 0) - list_add_tail(&chunk->list, &rc->bad_chunks); - else - list_add_tail(&chunk->list, &rc->good_chunks); - } - /* - * Don't worry about the lost orphan device extents, they don't - * have its chunk and block group, they must be the old ones that - * we have dropped. - */ - return 0; -} - -static int btrfs_recover_chunk_tree(char *path, int verbose, int yes) -{ - int ret = 0; - struct btrfs_root *root = NULL; - struct btrfs_trans_handle *trans; - struct recover_control rc; - - init_recover_control(&rc, verbose, yes); - - ret = recover_prepare(&rc, path); - if (ret) { - fprintf(stderr, "recover prepare error\n"); - return ret; - } - - ret = scan_devices(&rc); - if (ret) { - fprintf(stderr, "scan chunk headers error\n"); - goto fail_rc; - } - - if (cache_tree_empty(&rc.chunk) && - cache_tree_empty(&rc.bg.tree) && - cache_tree_empty(&rc.devext.tree)) { - fprintf(stderr, "no recoverable chunk\n"); - goto fail_rc; - } - - print_scan_result(&rc); - - ret = check_chunks(&rc.chunk, &rc.bg, &rc.devext, &rc.good_chunks, - &rc.bad_chunks, 1); - print_check_result(&rc); - if (ret) { - if (!list_empty(&rc.bg.block_groups) || - !list_empty(&rc.devext.no_chunk_orphans)) { - ret = btrfs_recover_chunks(&rc); - if (ret) - goto fail_rc; - } - /* - * If the chunk is healthy, its block group item and device - * extent item should be written on the disks. So, it is very - * likely that the bad chunk is a old one that has been - * droppped from the fs. Don't deal with them now, we will - * check it after the fs is opened. - */ - } - - root = open_ctree_with_broken_chunk(&rc); - if (IS_ERR(root)) { - fprintf(stderr, "open with broken chunk error\n"); - ret = PTR_ERR(root); - goto fail_rc; - } - - ret = check_all_chunks_by_metadata(&rc, root); - if (ret) { - fprintf(stderr, "The chunks in memory can not match the metadata of the fs. Repair failed.\n"); - goto fail_close_ctree; - } - - if (!rc.yes) { - ret = ask_user("We are going to rebuild the chunk tree on disk, it might destroy the old metadata on the disk, Are you sure?"); - if (!ret) { - ret = BTRFS_CHUNK_TREE_REBUILD_ABORTED; - goto fail_close_ctree; - } - } - - trans = btrfs_start_transaction(root, 1); - ret = remove_chunk_extent_item(trans, &rc, root); - BUG_ON(ret); - - ret = rebuild_chunk_tree(trans, &rc, root); - BUG_ON(ret); - - ret = rebuild_sys_array(&rc, root); - BUG_ON(ret); - - btrfs_commit_transaction(trans, root); -fail_close_ctree: - close_ctree(root); -fail_rc: - free_recover_control(&rc); - return ret; -} - -const char * const cmd_chunk_recover_usage[] = { - "btrfs rescue chunk-recover [options] ", - "Recover the chunk tree by scanning the devices one by one.", - "", - "-y Assume an answer of `yes' to all questions", - "-v Verbose mode", - "-h Help", - NULL -}; - -int cmd_chunk_recover(int argc, char *argv[]) -{ - int ret = 0; - char *file; - int yes = 0; - int verbose = 0; - - while (1) { - int c = getopt(argc, argv, "yvh"); - if (c < 0) - break; - switch (c) { - case 'y': - yes = 1; - break; - case 'v': - verbose = 1; - break; - case 'h': - default: - usage(cmd_chunk_recover_usage); - } - } - - argc = argc - optind; - if (argc == 0) - usage(cmd_chunk_recover_usage); - - file = argv[optind]; - - ret = check_mounted(file); - if (ret) { - fprintf(stderr, "the device is busy\n"); - goto out; - } - - ret = btrfs_recover_chunk_tree(file, verbose, yes); - if (!ret) { - fprintf(stdout, "Recover the chunk tree successfully.\n"); - } else if (ret == BTRFS_CHUNK_TREE_REBUILD_ABORTED) { - ret = 0; - fprintf(stdout, "Abort to rebuild the on-disk chunk tree.\n"); - } else { - fprintf(stdout, "Fail to recover the chunk tree.\n"); - } -out: - return !!ret; -} -- 2.11.4.GIT