--- /dev/null
+/*
+ * Copyright (C) 2008 Oracle. 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 1
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <zlib.h>
+#include "kerncompat.h"
+#include "crc32c.h"
+#include "ctree.h"
+#include "disk-io.h"
+#include "transaction.h"
+#include "utils.h"
+#include "version.h"
+
+
+#define HEADER_MAGIC 0xbd5c25e27295668bULL
+#define MAX_PENDING_SIZE (256 * 1024)
+#define BLOCK_SIZE 1024
+#define BLOCK_MASK (BLOCK_SIZE - 1)
+
+#define COMPRESS_NONE 0
+#define COMPRESS_ZLIB 1
+
+struct meta_cluster_item {
+ __le64 bytenr;
+ __le32 size;
+} __attribute__ ((__packed__));
+
+struct meta_cluster_header {
+ __le64 magic;
+ __le64 bytenr;
+ __le32 nritems;
+ u8 compress;
+} __attribute__ ((__packed__));
+
+/* cluster header + index items + buffers */
+struct meta_cluster {
+ struct meta_cluster_header header;
+ struct meta_cluster_item items[];
+} __attribute__ ((__packed__));
+
+#define ITEMS_PER_CLUSTER ((BLOCK_SIZE - sizeof(struct meta_cluster)) / \
+ sizeof(struct meta_cluster_item))
+
+struct async_work {
+ struct list_head list;
+ struct list_head ordered;
+ u64 start;
+ u64 size;
+ u8 *buffer;
+ size_t bufsize;
+};
+
+struct metadump_struct {
+ struct btrfs_root *root;
+ FILE *out;
+
+ struct meta_cluster *cluster;
+
+ pthread_t *threads;
+ size_t num_threads;
+ pthread_mutex_t mutex;
+ pthread_cond_t cond;
+
+ struct list_head list;
+ struct list_head ordered;
+ size_t num_items;
+ size_t num_ready;
+
+ u64 pending_start;
+ u64 pending_size;
+
+ int compress_level;
+ int done;
+};
+
+struct mdrestore_struct {
+ FILE *in;
+ FILE *out;
+
+ pthread_t *threads;
+ size_t num_threads;
+ pthread_mutex_t mutex;
+ pthread_cond_t cond;
+
+ struct list_head list;
+ size_t num_items;
+
+ int compress_method;
+ int done;
+};
+
+static void csum_block(u8 *buf, size_t len)
+{
+ char result[BTRFS_CRC32_SIZE];
+ u32 crc = ~(u32)0;
+ crc = crc32c(crc, buf + BTRFS_CSUM_SIZE, len - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, result);
+ memcpy(buf, result, BTRFS_CRC32_SIZE);
+}
+
+/*
+ * zero inline extents and csum items
+ */
+static void zero_items(u8 *dst, struct extent_buffer *src)
+{
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_item *item;
+ struct btrfs_key key;
+ u32 nritems = btrfs_header_nritems(src);
+ size_t size;
+ unsigned long ptr;
+ int i, extent_type;
+
+ for (i = 0; i < nritems; i++) {
+ item = btrfs_item_nr(src, i);
+ btrfs_item_key_to_cpu(src, &key, i);
+ if (key.type == BTRFS_CSUM_ITEM_KEY) {
+ size = btrfs_item_size_nr(src, i);
+ memset(dst + btrfs_leaf_data(src) +
+ btrfs_item_offset_nr(src, i), 0, size);
+ continue;
+ }
+ if (key.type != BTRFS_EXTENT_DATA_KEY)
+ continue;
+
+ fi = btrfs_item_ptr(src, i, struct btrfs_file_extent_item);
+ extent_type = btrfs_file_extent_type(src, fi);
+ if (extent_type != BTRFS_FILE_EXTENT_INLINE)
+ continue;
+
+ ptr = btrfs_file_extent_inline_start(fi);
+ size = btrfs_file_extent_inline_item_len(src, item);
+ memset(dst + ptr, 0, size);
+ }
+}
+
+/*
+ * copy buffer and zero useless data in the buffer
+ */
+static void copy_buffer(u8 *dst, struct extent_buffer *src)
+{
+ int level;
+ size_t size;
+ u32 nritems;
+
+ memcpy(dst, src->data, src->len);
+ if (src->start == BTRFS_SUPER_INFO_OFFSET)
+ return;
+
+ level = btrfs_header_level(src);
+ nritems = btrfs_header_nritems(src);
+
+ if (nritems == 0) {
+ size = sizeof(struct btrfs_header);
+ memset(dst + size, 0, src->len - size);
+ } else if (level == 0) {
+ size = btrfs_leaf_data(src) +
+ btrfs_item_offset_nr(src, nritems - 1) -
+ btrfs_item_nr_offset(nritems);
+ memset(dst + btrfs_item_nr_offset(nritems), 0, size);
+ zero_items(dst, src);
+ } else {
+ size = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nritems;
+ memset(dst + size, 0, src->len - size);
+ }
+ csum_block(dst, src->len);
+}
+
+static void *dump_worker(void *data)
+{
+ struct metadump_struct *md = (struct metadump_struct *)data;
+ struct async_work *async;
+ int ret;
+
+ while (1) {
+ pthread_mutex_lock(&md->mutex);
+ while (list_empty(&md->list)) {
+ if (md->done) {
+ pthread_mutex_unlock(&md->mutex);
+ goto out;
+ }
+ pthread_cond_wait(&md->cond, &md->mutex);
+ }
+ async = list_entry(md->list.next, struct async_work, list);
+ list_del_init(&async->list);
+ pthread_mutex_unlock(&md->mutex);
+
+ if (md->compress_level > 0) {
+ u8 *orig = async->buffer;
+
+ async->bufsize = compressBound(async->size);
+ async->buffer = malloc(async->bufsize);
+
+ ret = compress2(async->buffer, &async->bufsize, orig,
+ async->size, md->compress_level);
+ BUG_ON(ret != Z_OK);
+
+ free(orig);
+ }
+
+ pthread_mutex_lock(&md->mutex);
+ md->num_ready++;
+ pthread_mutex_unlock(&md->mutex);
+ }
+out:
+ pthread_exit(NULL);
+}
+
+static void meta_cluster_init(struct metadump_struct *md, u64 start)
+{
+ struct meta_cluster_header *header;
+
+ md->num_items = 0;
+ md->num_ready = 0;
+ header = &md->cluster->header;
+ header->magic = cpu_to_le64(HEADER_MAGIC);
+ header->bytenr = cpu_to_le64(start);
+ header->nritems = cpu_to_le32(0);
+ header->compress = md->compress_level > 0 ?
+ COMPRESS_ZLIB : COMPRESS_NONE;
+}
+
+static int metadump_init(struct metadump_struct *md, struct btrfs_root *root,
+ FILE *out, int num_threads, int compress_level)
+{
+ int i, ret;
+
+ memset(md, 0, sizeof(*md));
+ pthread_cond_init(&md->cond, NULL);
+ pthread_mutex_init(&md->mutex, NULL);
+ INIT_LIST_HEAD(&md->list);
+ INIT_LIST_HEAD(&md->ordered);
+ md->root = root;
+ md->out = out;
+ md->pending_start = (u64)-1;
+ md->compress_level = compress_level;
+ md->cluster = calloc(1, BLOCK_SIZE);
+ if (!md->cluster)
+ return -ENOMEM;
+
+ meta_cluster_init(md, 0);
+ if (!num_threads)
+ return 0;
+
+ md->num_threads = num_threads;
+ md->threads = calloc(num_threads, sizeof(pthread_t));
+ if (!md->threads)
+ return -ENOMEM;
+ for (i = 0; i < num_threads; i++) {
+ ret = pthread_create(md->threads + i, NULL, dump_worker, md);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+static void metadump_destroy(struct metadump_struct *md)
+{
+ int i;
+ pthread_mutex_lock(&md->mutex);
+ md->done = 1;
+ pthread_cond_broadcast(&md->cond);
+ pthread_mutex_unlock(&md->mutex);
+
+ for (i = 0; i < md->num_threads; i++)
+ pthread_join(md->threads[i], NULL);
+
+ pthread_cond_destroy(&md->cond);
+ pthread_mutex_destroy(&md->mutex);
+ free(md->threads);
+ free(md->cluster);
+}
+
+static int write_zero(FILE *out, size_t size)
+{
+ static char zero[BLOCK_SIZE];
+ return fwrite(zero, size, 1, out);
+}
+
+static int write_buffers(struct metadump_struct *md, u64 *next)
+{
+ struct meta_cluster_header *header = &md->cluster->header;
+ struct meta_cluster_item *item;
+ struct async_work *async;
+ u64 bytenr = 0;
+ u32 nritems = 0;
+ int ret;
+
+ if (list_empty(&md->ordered))
+ goto out;
+
+ /* wait until all buffers are compressed */
+ while (md->num_items > md->num_ready) {
+ struct timespec ts = {
+ .tv_sec = 0,
+ .tv_nsec = 10000000,
+ };
+ pthread_mutex_unlock(&md->mutex);
+ nanosleep(&ts, NULL);
+ pthread_mutex_lock(&md->mutex);
+ }
+
+ /* setup and write index block */
+ list_for_each_entry(async, &md->ordered, ordered) {
+ item = md->cluster->items + nritems;
+ item->bytenr = cpu_to_le64(async->start);
+ item->size = cpu_to_le32(async->bufsize);
+ nritems++;
+ }
+ header->nritems = cpu_to_le32(nritems);
+
+ ret = fwrite(md->cluster, BLOCK_SIZE, 1, md->out);
+ BUG_ON(ret != 1);
+
+ /* write buffers */
+ bytenr += le64_to_cpu(header->bytenr) + BLOCK_SIZE;
+ while (!list_empty(&md->ordered)) {
+ async = list_entry(md->ordered.next, struct async_work,
+ ordered);
+ list_del_init(&async->ordered);
+
+ bytenr += async->bufsize;
+ ret = fwrite(async->buffer, async->bufsize, 1, md->out);
+ BUG_ON(ret != 1);
+
+ free(async->buffer);
+ free(async);
+ }
+
+ /* zero unused space in the last block */
+ if (bytenr & BLOCK_MASK) {
+ size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
+
+ bytenr += size;
+ ret = write_zero(md->out, size);
+ BUG_ON(ret != 1);
+ }
+out:
+ *next = bytenr;
+ return 0;
+}
+
+static int flush_pending(struct metadump_struct *md, int done)
+{
+ struct async_work *async = NULL;
+ struct extent_buffer *eb;
+ u64 blocksize = md->root->nodesize;
+ u64 start;
+ u64 size;
+ size_t offset;
+ int ret;
+
+ if (md->pending_size) {
+ async = calloc(1, sizeof(*async));
+ if (!async)
+ return -ENOMEM;
+
+ async->start = md->pending_start;
+ async->size = md->pending_size;
+ async->bufsize = async->size;
+ async->buffer = malloc(async->bufsize);
+
+ offset = 0;
+ start = async->start;
+ size = async->size;
+ while (size > 0) {
+ eb = read_tree_block(md->root, start, blocksize, 0);
+ BUG_ON(!eb);
+ copy_buffer(async->buffer + offset, eb);
+ free_extent_buffer(eb);
+ start += blocksize;
+ offset += blocksize;
+ size -= blocksize;
+ }
+
+ md->pending_start = (u64)-1;
+ md->pending_size = 0;
+ } else if (!done) {
+ return 0;
+ }
+
+ pthread_mutex_lock(&md->mutex);
+ if (async) {
+ list_add_tail(&async->ordered, &md->ordered);
+ md->num_items++;
+ if (md->compress_level > 0) {
+ list_add_tail(&async->list, &md->list);
+ pthread_cond_signal(&md->cond);
+ } else {
+ md->num_ready++;
+ }
+ }
+ if (md->num_items >= ITEMS_PER_CLUSTER || done) {
+ ret = write_buffers(md, &start);
+ BUG_ON(ret);
+ meta_cluster_init(md, start);
+ }
+ pthread_mutex_unlock(&md->mutex);
+ return 0;
+}
+
+static int add_metadata(u64 start, u64 size, struct metadump_struct *md)
+{
+ int ret;
+ if (md->pending_size + size > MAX_PENDING_SIZE ||
+ md->pending_start + md->pending_size != start) {
+ ret = flush_pending(md, 0);
+ if (ret)
+ return ret;
+ md->pending_start = start;
+ }
+ readahead_tree_block(md->root, start, size, 0);
+ md->pending_size += size;
+ return 0;
+}
+
+static int create_metadump(const char *input, FILE *out, int num_threads,
+ int compress_level)
+{
+ struct btrfs_root *root;
+ struct btrfs_root *extent_root;
+ struct btrfs_path *path;
+ struct extent_buffer *leaf;
+ struct btrfs_extent_ref *ref_item;
+ struct btrfs_key key;
+ struct metadump_struct metadump;
+ u64 bytenr;
+ u64 num_bytes;
+ u64 ref_objectid;
+ int ret;
+
+ root = open_ctree(input, 0, 0);
+ BUG_ON(root->nodesize != root->leafsize);
+
+ ret = metadump_init(&metadump, root, out, num_threads,
+ compress_level);
+ BUG_ON(ret);
+
+ ret = add_metadata(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump);
+ BUG_ON(ret);
+
+ extent_root = root->fs_info->extent_root;
+ path = btrfs_alloc_path();
+
+ bytenr = BTRFS_SUPER_INFO_OFFSET + 4096;
+ key.objectid = bytenr;
+ key.type = BTRFS_EXTENT_ITEM_KEY;
+ key.offset = 0;
+
+ ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
+ BUG_ON(ret < 0);
+
+ while (1) {
+ leaf = path->nodes[0];
+ if (path->slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(extent_root, path);
+ BUG_ON(ret < 0);
+ if (ret > 0)
+ break;
+ leaf = path->nodes[0];
+ }
+
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.objectid < bytenr ||
+ key.type != BTRFS_EXTENT_ITEM_KEY) {
+ path->slots[0]++;
+ continue;
+ }
+
+ bytenr = key.objectid;
+ num_bytes = key.offset;
+ while (1) {
+ path->slots[0]++;
+ if (path->slots[0] >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(extent_root, path);
+ BUG_ON(ret < 0);
+ if (ret > 0)
+ break;
+ leaf = path->nodes[0];
+ }
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.objectid != bytenr)
+ break;
+ if (key.type != BTRFS_EXTENT_REF_KEY)
+ continue;
+ ref_item = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_extent_ref);
+ ref_objectid = btrfs_ref_objectid(leaf, ref_item);
+ if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) {
+ ret = add_metadata(bytenr, num_bytes,
+ &metadump);
+ BUG_ON(ret);
+ break;
+ }
+ }
+ bytenr += num_bytes;
+ }
+
+ ret = flush_pending(&metadump, 1);
+ BUG_ON(ret);
+
+ metadump_destroy(&metadump);
+
+ btrfs_free_path(path);
+ ret = close_ctree(root);
+ return 0;
+}
+
+static void update_super(u8 *buffer)
+{
+ struct btrfs_super_block *super = (struct btrfs_super_block *)buffer;
+ struct btrfs_chunk *chunk;
+ struct btrfs_disk_key *key;
+ u32 sectorsize = btrfs_super_sectorsize(super);
+ u64 flags = btrfs_super_flags(super);
+
+ flags |= BTRFS_SUPER_FLAG_METADUMP;
+ btrfs_set_super_flags(super, flags);
+
+ key = (struct btrfs_disk_key *)(super->sys_chunk_array);
+ chunk = (struct btrfs_chunk *)(super->sys_chunk_array +
+ sizeof(struct btrfs_disk_key));
+
+ btrfs_set_disk_key_objectid(key, BTRFS_FIRST_CHUNK_TREE_OBJECTID);
+ btrfs_set_disk_key_type(key, BTRFS_CHUNK_ITEM_KEY);
+ btrfs_set_disk_key_offset(key, 0);
+
+ btrfs_set_stack_chunk_length(chunk, (u64)-1);
+ btrfs_set_stack_chunk_owner(chunk, BTRFS_EXTENT_TREE_OBJECTID);
+ btrfs_set_stack_chunk_stripe_len(chunk, 64 * 1024);
+ btrfs_set_stack_chunk_type(chunk, BTRFS_BLOCK_GROUP_SYSTEM);
+ btrfs_set_stack_chunk_io_align(chunk, sectorsize);
+ btrfs_set_stack_chunk_io_width(chunk, sectorsize);
+ btrfs_set_stack_chunk_sector_size(chunk, sectorsize);
+ btrfs_set_stack_chunk_num_stripes(chunk, 1);
+ btrfs_set_stack_chunk_sub_stripes(chunk, 0);
+ chunk->stripe.devid = super->dev_item.devid;
+ chunk->stripe.offset = cpu_to_le64(0);
+ memcpy(chunk->stripe.dev_uuid, super->dev_item.uuid, BTRFS_UUID_SIZE);
+ btrfs_set_super_sys_array_size(super, sizeof(*key) + sizeof(*chunk));
+ csum_block(buffer, 4096);
+}
+
+static void *restore_worker(void *data)
+{
+ struct mdrestore_struct *mdres = (struct mdrestore_struct *)data;
+ struct async_work *async;
+ size_t size;
+ u8 *buffer;
+ u8 *outbuf;
+ int outfd;
+ int ret;
+
+ outfd = fileno(mdres->out);
+ buffer = malloc(MAX_PENDING_SIZE * 2);
+ BUG_ON(!buffer);
+
+ while (1) {
+ pthread_mutex_lock(&mdres->mutex);
+ while (list_empty(&mdres->list)) {
+ if (mdres->done) {
+ pthread_mutex_unlock(&mdres->mutex);
+ goto out;
+ }
+ pthread_cond_wait(&mdres->cond, &mdres->mutex);
+ }
+ async = list_entry(mdres->list.next, struct async_work, list);
+ list_del_init(&async->list);
+ pthread_mutex_unlock(&mdres->mutex);
+
+ if (mdres->compress_method == COMPRESS_ZLIB) {
+ size = MAX_PENDING_SIZE * 2;
+ ret = uncompress(buffer, &size, async->buffer,
+ async->bufsize);
+ BUG_ON(ret != Z_OK);
+ outbuf = buffer;
+ } else {
+ outbuf = async->buffer;
+ size = async->bufsize;
+ }
+
+ if (async->start == BTRFS_SUPER_INFO_OFFSET)
+ update_super(outbuf);
+
+ ret = pwrite64(outfd, outbuf, size, async->start);
+ BUG_ON(ret != size);
+
+ pthread_mutex_lock(&mdres->mutex);
+ mdres->num_items--;
+ pthread_mutex_unlock(&mdres->mutex);
+
+ free(async->buffer);
+ free(async);
+ }
+out:
+ free(buffer);
+ pthread_exit(NULL);
+}
+
+static int mdresotre_init(struct mdrestore_struct *mdres,
+ FILE *in, FILE *out, int num_threads)
+{
+ int i, ret = 0;
+
+ memset(mdres, 0, sizeof(*mdres));
+ pthread_cond_init(&mdres->cond, NULL);
+ pthread_mutex_init(&mdres->mutex, NULL);
+ INIT_LIST_HEAD(&mdres->list);
+ mdres->in = in;
+ mdres->out = out;
+
+ if (!num_threads)
+ return 0;
+
+ mdres->num_threads = num_threads;
+ mdres->threads = calloc(num_threads, sizeof(pthread_t));
+ if (!mdres->threads)
+ return -ENOMEM;
+ for (i = 0; i < num_threads; i++) {
+ ret = pthread_create(mdres->threads + i, NULL, restore_worker,
+ mdres);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+static void mdresotre_destroy(struct mdrestore_struct *mdres)
+{
+ int i;
+ pthread_mutex_lock(&mdres->mutex);
+ mdres->done = 1;
+ pthread_cond_broadcast(&mdres->cond);
+ pthread_mutex_unlock(&mdres->mutex);
+
+ for (i = 0; i < mdres->num_threads; i++)
+ pthread_join(mdres->threads[i], NULL);
+
+ pthread_cond_destroy(&mdres->cond);
+ pthread_mutex_destroy(&mdres->mutex);
+ free(mdres->threads);
+}
+
+static int add_cluster(struct meta_cluster *cluster,
+ struct mdrestore_struct *mdres, u64 *next)
+{
+ struct meta_cluster_item *item;
+ struct meta_cluster_header *header = &cluster->header;
+ struct async_work *async;
+ u64 bytenr;
+ u32 i, nritems;
+ int ret;
+
+ BUG_ON(mdres->num_items);
+ mdres->compress_method = header->compress;
+
+ bytenr = le64_to_cpu(header->bytenr) + BLOCK_SIZE;
+ nritems = le32_to_cpu(header->nritems);
+ for (i = 0; i < nritems; i++) {
+ item = &cluster->items[i];
+ async = calloc(1, sizeof(*async));
+ async->start = le64_to_cpu(item->bytenr);
+ async->bufsize = le32_to_cpu(item->size);
+ async->buffer = malloc(async->bufsize);
+ ret = fread(async->buffer, async->bufsize, 1, mdres->in);
+ BUG_ON(ret != 1);
+ bytenr += async->bufsize;
+
+ pthread_mutex_lock(&mdres->mutex);
+ list_add_tail(&async->list, &mdres->list);
+ mdres->num_items++;
+ pthread_cond_signal(&mdres->cond);
+ pthread_mutex_unlock(&mdres->mutex);
+ }
+ if (bytenr & BLOCK_MASK) {
+ char buffer[BLOCK_MASK];
+ size_t size = BLOCK_SIZE - (bytenr & BLOCK_MASK);
+
+ bytenr += size;
+ ret = fread(buffer, size, 1, mdres->in);
+ BUG_ON(ret != 1);
+ }
+ *next = bytenr;
+ return 0;
+}
+
+static int wait_for_worker(struct mdrestore_struct *mdres)
+{
+ pthread_mutex_lock(&mdres->mutex);
+ while (mdres->num_items > 0) {
+ struct timespec ts = {
+ .tv_sec = 0,
+ .tv_nsec = 10000000,
+ };
+ pthread_mutex_unlock(&mdres->mutex);
+ nanosleep(&ts, NULL);
+ pthread_mutex_lock(&mdres->mutex);
+ }
+ pthread_mutex_unlock(&mdres->mutex);
+ return 0;
+}
+
+static int restore_metadump(const char *input, FILE *out, int num_threads)
+{
+ struct meta_cluster *cluster;
+ struct meta_cluster_header *header;
+ struct mdrestore_struct mdrestore;
+ u64 bytenr = 0;
+ FILE *in;
+ int ret;
+
+ if (!strcmp(input, "-")) {
+ in = stdin;
+ } else {
+ in = fopen(input, "r");
+ if (!in) {
+ perror("unable to open metadump image");
+ exit(1);
+ }
+ }
+
+ cluster = malloc(BLOCK_SIZE);
+ BUG_ON(!cluster);
+
+ ret = mdresotre_init(&mdrestore, in, out, num_threads);
+ BUG_ON(ret);
+
+ while (1) {
+ ret = fread(cluster, BLOCK_SIZE, 1, in);
+ if (!ret)
+ break;
+
+ header = &cluster->header;
+ if (le64_to_cpu(header->magic) != HEADER_MAGIC ||
+ le64_to_cpu(header->bytenr) != bytenr) {
+ fprintf(stderr, "bad header in metadump image\n");
+ exit(1);
+ }
+ ret = add_cluster(cluster, &mdrestore, &bytenr);
+ BUG_ON(ret);
+
+ wait_for_worker(&mdrestore);
+ }
+
+ mdresotre_destroy(&mdrestore);
+ free(cluster);
+ if (in != stdin)
+ fclose(in);
+ return ret;
+}
+
+static void print_usage(void)
+{
+ fprintf(stderr, "usage: btrfs-image [options] source target\n");
+ fprintf(stderr, "\t-r \trestore metadump image\n");
+ fprintf(stderr, "\t-c value\tcompression level (0 ~ 9)\n");
+ fprintf(stderr, "\t-t value\tnumber of threads (1 ~ 32)\n");
+ exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+ char *source;
+ char *target;
+ int num_threads = 0;
+ int compress_level = 0;
+ int create = 1;
+ int ret;
+ FILE *out;
+
+ while (1) {
+ int c = getopt(argc, argv, "rc:t:");
+ if (c < 0)
+ break;
+ switch (c) {
+ case 'r':
+ create = 0;
+ break;
+ case 't':
+ num_threads = atoi(optarg);
+ if (num_threads <= 0 || num_threads > 32)
+ print_usage();
+ break;
+ case 'c':
+ compress_level = atoi(optarg);
+ if (compress_level < 0 || compress_level > 9)
+ print_usage();
+ break;
+ default:
+ print_usage();
+ }
+ }
+
+ argc = argc - optind;
+ if (argc != 2)
+ print_usage();
+ source = argv[optind];
+ target = argv[optind + 1];
+
+ if (create && !strcmp(target, "-")) {
+ out = stdout;
+ } else {
+ out = fopen(target, "w+");
+ if (!out) {
+ perror("unable to create target file");
+ exit(1);
+ }
+ }
+
+ if (num_threads == 0 && compress_level > 0) {
+ num_threads = sysconf(_SC_NPROCESSORS_ONLN);
+ if (num_threads <= 0)
+ num_threads = 1;
+ }
+
+ if (create)
+ ret = create_metadump(source, out, num_threads,
+ compress_level);
+ else
+ ret = restore_metadump(source, out, 1);
+
+ if (out == stdout)
+ fflush(out);
+ else
+ fclose(out);
+
+ exit(0);
+}
projects / platform / upstream / btrfs-progs.git / commitdiff