Btrfs-progs: make btrfs-image grab the free space cache
A lot of tree log replay bugs are because of strange space cache setups, so make btrfs-image scrape the free space cache as well so we can better replicate what a user is seeing if they have a tree log bug or anything related to free space cache. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik
David Sterba
parent
274518d7b8
commit
2881054956
162
btrfs-image.c
162
btrfs-image.c
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@ -34,7 +34,7 @@
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#include "transaction.h"
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#include "utils.h"
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#include "version.h"
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#include "volumes.h"
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#define HEADER_MAGIC 0xbd5c25e27295668bULL
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#define MAX_PENDING_SIZE (256 * 1024)
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@ -96,6 +96,7 @@ struct metadump_struct {
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int compress_level;
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int done;
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int data;
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};
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struct mdrestore_struct {
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@ -409,6 +410,60 @@ out:
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return err;
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}
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static int read_data_extent(struct metadump_struct *md,
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struct async_work *async)
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{
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struct btrfs_multi_bio *multi = NULL;
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struct btrfs_device *device;
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u64 bytes_left = async->size;
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u64 logical = async->start;
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u64 offset = 0;
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u64 bytenr;
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u64 read_len;
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ssize_t done;
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int fd;
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int ret;
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while (bytes_left) {
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read_len = bytes_left;
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ret = btrfs_map_block(&md->root->fs_info->mapping_tree, READ,
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logical, &read_len, &multi, 0, NULL);
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if (ret) {
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fprintf(stderr, "Couldn't map data block %d\n", ret);
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return ret;
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}
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device = multi->stripes[0].dev;
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if (device->fd == 0) {
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fprintf(stderr,
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"Device we need to read from is not open\n");
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free(multi);
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return -EIO;
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}
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fd = device->fd;
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bytenr = multi->stripes[0].physical;
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free(multi);
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read_len = min(read_len, bytes_left);
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done = pread64(fd, async->buffer+offset, read_len, bytenr);
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if (done < read_len) {
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if (done < 0)
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fprintf(stderr, "Error reading extent %d\n",
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errno);
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else
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fprintf(stderr, "Short read\n");
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return -EIO;
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}
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bytes_left -= done;
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offset += done;
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logical += done;
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}
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return 0;
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}
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static int flush_pending(struct metadump_struct *md, int done)
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{
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struct async_work *async = NULL;
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@ -435,7 +490,17 @@ static int flush_pending(struct metadump_struct *md, int done)
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offset = 0;
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start = async->start;
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size = async->size;
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while (size > 0) {
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if (md->data) {
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ret = read_data_extent(md, async);
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if (ret) {
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free(async->buffer);
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free(async);
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return ret;
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}
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}
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while (!md->data && size > 0) {
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eb = read_tree_block(md->root, start, blocksize, 0);
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if (!eb) {
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free(async->buffer);
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@ -480,10 +545,12 @@ static int flush_pending(struct metadump_struct *md, int done)
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return ret;
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}
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static int add_metadata(u64 start, u64 size, struct metadump_struct *md)
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static int add_extent(u64 start, u64 size, struct metadump_struct *md,
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int data)
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{
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int ret;
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if (md->pending_size + size > MAX_PENDING_SIZE ||
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if (md->data != data ||
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md->pending_size + size > MAX_PENDING_SIZE ||
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md->pending_start + md->pending_size != start) {
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ret = flush_pending(md, 0);
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if (ret)
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@ -492,6 +559,7 @@ static int add_metadata(u64 start, u64 size, struct metadump_struct *md)
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}
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readahead_tree_block(md->root, start, size, 0);
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md->pending_size += size;
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md->data = data;
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return 0;
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}
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@ -545,7 +613,7 @@ static int copy_log_blocks(struct btrfs_root *root, struct extent_buffer *eb,
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int i = 0;
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int ret;
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ret = add_metadata(btrfs_header_bytenr(eb), root->leafsize, metadump);
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ret = add_extent(btrfs_header_bytenr(eb), root->leafsize, metadump, 0);
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if (ret) {
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fprintf(stderr, "Error adding metadata block\n");
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return ret;
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@ -610,6 +678,72 @@ static int copy_log_trees(struct btrfs_root *root,
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metadump, 1);
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}
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static int copy_space_cache(struct btrfs_root *root,
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struct metadump_struct *metadump,
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struct btrfs_path *path)
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{
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struct extent_buffer *leaf;
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struct btrfs_file_extent_item *fi;
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struct btrfs_key key;
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u64 bytenr, num_bytes;
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int ret;
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root = root->fs_info->tree_root;
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key.objectid = 0;
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key.type = BTRFS_EXTENT_DATA_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0) {
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fprintf(stderr, "Error searching for free space inode %d\n",
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ret);
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return ret;
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}
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while (1) {
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leaf = path->nodes[0];
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if (path->slots[0] >= btrfs_header_nritems(leaf)) {
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ret = btrfs_next_leaf(root, path);
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if (ret < 0) {
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fprintf(stderr, "Error going to next leaf "
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"%d\n", ret);
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return ret;
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}
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if (ret > 0)
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break;
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leaf = path->nodes[0];
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}
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btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
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if (key.type != BTRFS_EXTENT_DATA_KEY) {
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path->slots[0]++;
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continue;
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}
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fi = btrfs_item_ptr(leaf, path->slots[0],
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struct btrfs_file_extent_item);
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if (btrfs_file_extent_type(leaf, fi) !=
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BTRFS_FILE_EXTENT_REG) {
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path->slots[0]++;
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continue;
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}
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bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
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num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
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ret = add_extent(bytenr, num_bytes, metadump, 1);
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if (ret) {
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fprintf(stderr, "Error adding space cache blocks %d\n",
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ret);
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btrfs_release_path(root, path);
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return ret;
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}
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path->slots[0]++;
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}
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return 0;
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}
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static int create_metadump(const char *input, FILE *out, int num_threads,
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int compress_level)
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{
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@ -641,7 +775,7 @@ static int create_metadump(const char *input, FILE *out, int num_threads,
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return ret;
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}
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ret = add_metadata(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump);
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ret = add_extent(BTRFS_SUPER_INFO_OFFSET, 4096, &metadump, 0);
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if (ret) {
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fprintf(stderr, "Error adding metadata %d\n", ret);
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err = ret;
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@ -697,8 +831,8 @@ static int create_metadump(const char *input, FILE *out, int num_threads,
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struct btrfs_extent_item);
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if (btrfs_extent_flags(leaf, ei) &
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BTRFS_EXTENT_FLAG_TREE_BLOCK) {
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ret = add_metadata(bytenr, num_bytes,
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&metadump);
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ret = add_extent(bytenr, num_bytes, &metadump,
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0);
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if (ret) {
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fprintf(stderr, "Error adding block "
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"%d\n", ret);
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@ -717,8 +851,8 @@ static int create_metadump(const char *input, FILE *out, int num_threads,
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}
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if (ret) {
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ret = add_metadata(bytenr, num_bytes,
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&metadump);
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ret = add_extent(bytenr, num_bytes, &metadump,
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0);
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if (ret) {
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fprintf(stderr, "Error adding block "
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"%d\n", ret);
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@ -736,9 +870,15 @@ static int create_metadump(const char *input, FILE *out, int num_threads,
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bytenr += num_bytes;
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}
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btrfs_release_path(root, path);
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ret = copy_log_trees(root, &metadump, path);
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if (ret)
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if (ret) {
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err = ret;
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goto out;
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}
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ret = copy_space_cache(root, &metadump, path);
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out:
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ret = flush_pending(&metadump, 1);
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if (ret) {
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