The command has been moved and we should rename the files accordingly,
so the entry point is now in cmds-rescue.c and the core functionality
in it's own file.
Return codes of btrfs_recover_chunk_tree have been simplified not to
require a define and another file for defintion.
CC: Miao Xie <mi...@cn.fujitsu.com>
Signed-off-by: David Sterba <dste...@suse.cz>
---
Makefile | 3 +-
chunk-recover.c | 1745 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
cmds-rescue.c | 62 ++
3 files changed, 1809 insertions(+), 1 deletion(-)
create mode 100644 chunk-recover.c
diff --git a/Makefile b/Makefile
index 9e58028..bd32121 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,8 @@ objects = ctree.o disk-io.o radix-tree.o extent-tree.o
print-tree.o \
cmds_objects = cmds-subvolume.o cmds-filesystem.o cmds-device.o cmds-scrub.o \
cmds-inspect.o cmds-balance.o cmds-send.o cmds-receive.o \
cmds-quota.o cmds-qgroup.o cmds-replace.o cmds-check.o \
- cmds-restore.o cmds-chunk.o cmds-dedup.o cmds-rescue.o
+ cmds-restore.o cmds-dedup.o cmds-rescue.o \
+ chunk-recover.o
libbtrfs_objects = send-stream.o send-utils.o rbtree.o btrfs-list.o crc32c.o \
uuid-tree.o
libbtrfs_headers = send-stream.h send-utils.h send.h rbtree.h btrfs-list.h \
diff --git a/chunk-recover.c b/chunk-recover.c
new file mode 100644
index 0000000..45da9a6
--- /dev/null
+++ b/chunk-recover.c
@@ -0,0 +1,1745 @@
+/*
+ * 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 <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <uuid/uuid.h>
+
+#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_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,
+ (unsigned long)btrfs_header_fsid(buf),
+ 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;
+
+ list_for_each_entry(dev, &rc->fs_devices->devices, dev_list) {
+ fd = open(dev->name, O_RDONLY);
+ if (fd < 0) {
+ fprintf(stderr, "Failed to open device %s\n",
+ dev->name);
+ return -1;
+ }
+ 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;
+ }
+ disk_key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
+ disk_key.type = BTRFS_DEV_ITEM_KEY;
+ disk_key.offset = 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,
+ (unsigned long)btrfs_header_fsid(cow),
+ 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->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);
+ 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;
+}
+
+/*
+ * Return 0 when succesful, < 0 on error and > 0 if aborted by user
+ */
+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 = 1;
+ 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;
+}
diff --git a/cmds-rescue.c b/cmds-rescue.c
index 35b3bb1..cfbc198 100644
--- a/cmds-rescue.c
+++ b/cmds-rescue.c
@@ -18,13 +18,75 @@
#include "kerncompat.h"
+#include <getopt.h>
#include "commands.h"
+#include "utils.h"
static const char * const rescue_cmd_group_usage[] = {
"btrfs rescue <command> [options] <path>",
NULL
};
+int btrfs_recover_chunk_tree(char *path, int verbose, int yes);
+
+const char * const cmd_chunk_recover_usage[] = {
+ "btrfs rescue chunk-recover [options] <device>",
+ "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");
+ return ret;
+ }
+
+ ret = btrfs_recover_chunk_tree(file, verbose, yes);
+ if (!ret) {
+ fprintf(stdout, "Recover the chunk tree successfully.\n");
+ } else if (ret > 0) {
+ ret = 0;
+ fprintf(stdout, "Abort to rebuild the on-disk chunk tree.\n");
+ } else {
+ fprintf(stdout, "Fail to recover the chunk tree.\n");
+ }
+ return ret;
+}
+
const struct cmd_group rescue_cmd_group = {
rescue_cmd_group_usage, NULL, {
{ "chunk-recover", cmd_chunk_recover, cmd_chunk_recover_usage,
NULL, 0},
--
1.8.3.1
--
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