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Copy pathrestore.c
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restore.c
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/*
* Copyright (C) 2011 Red Hat. 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.
*/
#include "kerncompat.h"
#include <sys/types.h>
#include <sys/xattr.h>
#include <sys/stat.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <regex.h>
#include <getopt.h>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <string.h>
#if COMPRESSION_LZO
#include <lzo/lzoconf.h>
#include <lzo/lzo1x.h>
#endif
#include <zlib.h>
#if COMPRESSION_ZSTD
#include <zstd.h>
#endif
#include "kernel-shared/accessors.h"
#include "kernel-shared/uapi/btrfs_tree.h"
#include "kernel-shared/ctree.h"
#include "kernel-shared/disk-io.h"
#include "kernel-shared/print-tree.h"
#include "kernel-shared/volumes.h"
#include "kernel-shared/extent_io.h"
#include "kernel-shared/compression.h"
#include "kernel-shared/file-item.h"
#include "kernel-shared/tree-checker.h"
#include "common/utils.h"
#include "common/help.h"
#include "common/open-utils.h"
#include "common/string-utils.h"
#include "common/messages.h"
#include "cmds/commands.h"
static char fs_name[PATH_MAX];
static char path_name[PATH_MAX];
static char symlink_target[PATH_MAX];
static int get_snaps = 0;
static int restore_metadata = 0;
static int restore_symlinks = 0;
static int ignore_errors = 0;
static int overwrite = 0;
static int get_xattrs = 0;
static int dry_run = 0;
#define LZO_LEN 4
#define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3)
static int decompress_zlib(char *inbuf, char *outbuf, u64 compress_len,
u64 decompress_len)
{
z_stream strm;
int ret;
memset(&strm, 0, sizeof(strm));
ret = inflateInit(&strm);
if (ret != Z_OK) {
error("zlib init returned %d", ret);
return -1;
}
strm.avail_in = compress_len;
strm.next_in = (unsigned char *)inbuf;
strm.avail_out = decompress_len;
strm.next_out = (unsigned char *)outbuf;
ret = inflate(&strm, Z_NO_FLUSH);
if (ret != Z_STREAM_END) {
(void)inflateEnd(&strm);
error("zlib inflate failed: %d", ret);
return -1;
}
(void)inflateEnd(&strm);
return 0;
}
static inline size_t read_compress_length(unsigned char *buf)
{
return get_unaligned_le32(buf);
}
static int decompress_lzo(struct btrfs_root *root, unsigned char *inbuf,
char *outbuf, u64 compress_len, u64 *decompress_len)
{
#if !COMPRESSION_LZO
error("btrfs-restore not compiled with lzo support");
return -1;
#else
size_t new_len;
size_t in_len;
size_t out_len = 0;
size_t tot_len;
size_t tot_in;
int ret;
ret = lzo_init();
if (ret != LZO_E_OK) {
error("lzo init returned %d", ret);
return -1;
}
tot_len = read_compress_length(inbuf);
inbuf += LZO_LEN;
tot_in = LZO_LEN;
while (tot_in < tot_len) {
size_t mod_page;
size_t rem_page;
in_len = read_compress_length(inbuf);
if ((tot_in + LZO_LEN + in_len) > tot_len) {
error("bad compress length %lu",
(unsigned long)in_len);
return -1;
}
inbuf += LZO_LEN;
tot_in += LZO_LEN;
new_len = lzo1x_worst_compress(root->fs_info->sectorsize);
ret = lzo1x_decompress_safe((const unsigned char *)inbuf, in_len,
(unsigned char *)outbuf,
(void *)&new_len, NULL);
if (ret != LZO_E_OK) {
error("lzo decompress failed: %d", ret);
return -1;
}
out_len += new_len;
outbuf += new_len;
inbuf += in_len;
tot_in += in_len;
/*
* If the 4 byte header does not fit to the rest of the page we
* have to move to the next one, unless we read some garbage
*/
mod_page = tot_in % root->fs_info->sectorsize;
rem_page = root->fs_info->sectorsize - mod_page;
if (rem_page < LZO_LEN) {
inbuf += rem_page;
tot_in += rem_page;
}
}
*decompress_len = out_len;
return 0;
#endif
}
static int decompress_zstd(const char *inbuf, char *outbuf, u64 compress_len,
u64 decompress_len)
{
#if !COMPRESSION_ZSTD
error("btrfs not compiled with zstd support");
return -1;
#else
ZSTD_DStream *strm;
size_t zret;
int ret = 0;
ZSTD_inBuffer in = {inbuf, compress_len, 0};
ZSTD_outBuffer out = {outbuf, decompress_len, 0};
strm = ZSTD_createDStream();
if (!strm) {
error("zstd create failed");
return -1;
}
zret = ZSTD_initDStream(strm);
if (ZSTD_isError(zret)) {
error("zstd init failed: %s", ZSTD_getErrorName(zret));
ret = -1;
goto out;
}
zret = ZSTD_decompressStream(strm, &out, &in);
if (ZSTD_isError(zret)) {
error("zstd decompress failed %s\n", ZSTD_getErrorName(zret));
ret = -1;
goto out;
}
if (zret != 0) {
error("zstd frame incomplete");
ret = -1;
goto out;
}
out:
ZSTD_freeDStream(strm);
return ret;
#endif
}
static int decompress(struct btrfs_root *root, char *inbuf, char *outbuf,
u64 compress_len, u64 *decompress_len, int compress)
{
switch (compress) {
case BTRFS_COMPRESS_ZLIB:
return decompress_zlib(inbuf, outbuf, compress_len,
*decompress_len);
case BTRFS_COMPRESS_LZO:
return decompress_lzo(root, (unsigned char *)inbuf, outbuf,
compress_len, decompress_len);
case BTRFS_COMPRESS_ZSTD:
return decompress_zstd(inbuf, outbuf, compress_len,
*decompress_len);
default:
break;
}
error("invalid compression type: %d", compress);
return -1;
}
static int next_leaf(struct btrfs_root *root, struct btrfs_path *path)
{
int slot;
int level = 1;
int offset = 1;
struct extent_buffer *c;
struct extent_buffer *next = NULL;
again:
for (; level < BTRFS_MAX_LEVEL; level++) {
if (path->nodes[level])
break;
}
if (level >= BTRFS_MAX_LEVEL)
return 1;
slot = path->slots[level] + 1;
while(level < BTRFS_MAX_LEVEL) {
if (!path->nodes[level])
return 1;
slot = path->slots[level] + offset;
c = path->nodes[level];
if (slot >= btrfs_header_nritems(c)) {
level++;
if (level == BTRFS_MAX_LEVEL)
return 1;
offset = 1;
continue;
}
next = btrfs_read_node_slot(c, slot);
if (extent_buffer_uptodate(next))
break;
offset++;
}
path->slots[level] = slot;
while(1) {
level--;
c = path->nodes[level];
free_extent_buffer(c);
path->nodes[level] = next;
path->slots[level] = 0;
if (!level)
break;
next = btrfs_read_node_slot(next, 0);
if (!extent_buffer_uptodate(next))
goto again;
}
return 0;
}
static int copy_one_inline(struct btrfs_root *root, int fd,
struct btrfs_path *path, u64 pos)
{
struct extent_buffer *leaf = path->nodes[0];
struct btrfs_file_extent_item *fi;
char buf[4096];
char *outbuf;
u64 ram_size;
ssize_t done;
unsigned long ptr;
int ret;
int len;
int inline_item_len;
int compress;
fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
ptr = btrfs_file_extent_inline_start(fi);
len = btrfs_file_extent_ram_bytes(leaf, fi);
inline_item_len = btrfs_file_extent_inline_item_len(leaf, path->slots[0]);
read_extent_buffer(leaf, buf, ptr, inline_item_len);
compress = btrfs_file_extent_compression(leaf, fi);
if (compress == BTRFS_COMPRESS_NONE) {
done = pwrite(fd, buf, len, pos);
if (done < len) {
error("short inline write, wanted %d, did %zd: %m",
len, done);
return -1;
}
return 0;
}
ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
outbuf = calloc(1, ram_size);
if (!outbuf) {
error_msg(ERROR_MSG_MEMORY, NULL);
return -ENOMEM;
}
ret = decompress(root, buf, outbuf, inline_item_len, &ram_size,
compress);
if (ret) {
free(outbuf);
return ret;
}
done = pwrite(fd, outbuf, ram_size, pos);
free(outbuf);
if (done < ram_size) {
error("short compressed inline write, wanted %llu, did %zd: %m",
ram_size, done);
return -1;
}
return 0;
}
static int copy_one_extent(struct btrfs_root *root, int fd,
struct extent_buffer *leaf,
struct btrfs_file_extent_item *fi, u64 pos)
{
char *inbuf, *outbuf = NULL;
ssize_t done, total = 0;
u64 bytenr;
u64 ram_size;
u64 disk_size;
u64 num_bytes;
u64 length;
u64 size_left;
u64 offset;
u64 cur;
int compress;
int ret;
int mirror_num = 1;
int num_copies;
compress = btrfs_file_extent_compression(leaf, fi);
bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
disk_size = btrfs_file_extent_disk_num_bytes(leaf, fi);
ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
offset = btrfs_file_extent_offset(leaf, fi);
num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
size_left = disk_size;
/* Hole, early exit */
if (disk_size == 0)
return 0;
/* Invalid file extent */
if ((compress == BTRFS_COMPRESS_NONE && offset >= disk_size) ||
offset > ram_size) {
error(
"invalid data extent offset, offset %llu disk_size %llu ram_size %llu",
offset, disk_size, ram_size);
return -EUCLEAN;
}
if (compress == BTRFS_COMPRESS_NONE && offset < disk_size) {
bytenr += offset;
size_left -= offset;
}
pr_verbose(offset ? 1 : 0, "offset is %llu\n", offset);
inbuf = malloc(size_left);
if (!inbuf) {
error_msg(ERROR_MSG_MEMORY, NULL);
return -ENOMEM;
}
if (compress != BTRFS_COMPRESS_NONE) {
outbuf = calloc(1, ram_size);
if (!outbuf) {
error_msg(ERROR_MSG_MEMORY, NULL);
free(inbuf);
return -ENOMEM;
}
}
num_copies = btrfs_num_copies(root->fs_info, bytenr, disk_size - offset);
again:
cur = bytenr;
while (cur < bytenr + size_left) {
length = bytenr + size_left - cur;
ret = read_data_from_disk(root->fs_info, inbuf + cur - bytenr, cur,
&length, mirror_num);
if (ret < 0) {
mirror_num++;
if (mirror_num > num_copies) {
ret = -1;
error("exhausted mirrors trying to read (%d > %d)",
mirror_num, num_copies);
goto out;
}
pr_stderr(LOG_DEFAULT, "trying another mirror\n");
continue;
}
cur += length;
}
if (compress == BTRFS_COMPRESS_NONE) {
while (total < num_bytes) {
done = pwrite(fd, inbuf+total, num_bytes-total,
pos+total);
if (done < 0) {
ret = -1;
error("cannot write data: %d %m", errno);
goto out;
}
total += done;
}
ret = 0;
goto out;
}
ret = decompress(root, inbuf, outbuf, disk_size, &ram_size, compress);
if (ret) {
mirror_num++;
if (mirror_num > num_copies) {
ret = -1;
goto out;
}
pr_stderr(LOG_DEFAULT,
"trying another mirror due to decompression error\n");
goto again;
}
while (total < num_bytes) {
done = pwrite(fd, outbuf + offset + total,
num_bytes - total,
pos + total);
if (done < 0) {
ret = -1;
goto out;
}
total += done;
}
out:
free(inbuf);
free(outbuf);
return ret;
}
static int set_file_xattrs(struct btrfs_root *root, u64 inode,
int fd, const char *file_name)
{
struct btrfs_key key;
struct btrfs_path path = { 0 };
struct extent_buffer *leaf;
struct btrfs_dir_item *di;
u32 name_len = 0;
u32 data_len = 0;
u32 len = 0;
u32 cur, total_len;
char *name = NULL;
char *data = NULL;
int ret = 0;
key.objectid = inode;
key.type = BTRFS_XATTR_ITEM_KEY;
key.offset = 0;
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
if (ret < 0)
goto out;
leaf = path.nodes[0];
while (1) {
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
do {
ret = next_leaf(root, &path);
if (ret < 0) {
error("searching for extended attributes: %d",
ret);
goto out;
} else if (ret) {
/* No more leaves to search */
ret = 0;
goto out;
}
leaf = path.nodes[0];
} while (!leaf);
continue;
}
btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
if (key.type != BTRFS_XATTR_ITEM_KEY || key.objectid != inode)
break;
cur = 0;
total_len = btrfs_item_size(leaf, path.slots[0]);
di = btrfs_item_ptr(leaf, path.slots[0],
struct btrfs_dir_item);
while (cur < total_len) {
len = btrfs_dir_name_len(leaf, di);
if (len > name_len) {
free(name);
name = (char *) malloc(len + 1);
if (!name) {
ret = -ENOMEM;
goto out;
}
}
read_extent_buffer(leaf, name,
(unsigned long)(di + 1), len);
name[len] = '\0';
name_len = len;
len = btrfs_dir_data_len(leaf, di);
if (len > data_len) {
free(data);
data = (char *) malloc(len);
if (!data) {
ret = -ENOMEM;
goto out;
}
}
read_extent_buffer(leaf, data,
(unsigned long)(di + 1) + name_len,
len);
data_len = len;
if (fsetxattr(fd, name, data, data_len, 0))
error("setting extended attribute %s on file %s: %m",
name, file_name);
len = sizeof(*di) + name_len + data_len;
cur += len;
di = (struct btrfs_dir_item *)((char *)di + len);
}
path.slots[0]++;
}
ret = 0;
out:
btrfs_release_path(&path);
free(name);
free(data);
return ret;
}
static int copy_metadata(struct btrfs_root *root, int fd,
struct btrfs_key *key)
{
struct btrfs_path path = { 0 };
struct btrfs_inode_item *inode_item;
int ret;
ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
if (ret == 0) {
struct btrfs_timespec *bts;
struct timespec times[2];
inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_inode_item);
ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
btrfs_inode_gid(path.nodes[0], inode_item));
if (ret) {
error("failed to change owner: %m");
goto out;
}
ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
if (ret) {
error("failed to change mode: %m");
goto out;
}
bts = btrfs_inode_atime(inode_item);
times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
bts = btrfs_inode_mtime(inode_item);
times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
ret = futimens(fd, times);
if (ret) {
error("failed to set times: %m");
goto out;
}
}
out:
btrfs_release_path(&path);
return ret;
}
static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
const char *file)
{
struct extent_buffer *leaf;
struct btrfs_path path = { 0 };
struct btrfs_file_extent_item *fi;
struct btrfs_inode_item *inode_item;
struct btrfs_timespec *bts;
struct btrfs_key found_key;
int ret;
int extent_type;
int compression;
u64 found_size = 0;
struct timespec times[2];
bool times_ok = false;
ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
if (ret == 0) {
inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_inode_item);
found_size = btrfs_inode_size(path.nodes[0], inode_item);
if (restore_metadata) {
/*
* Change the ownership and mode now, set times when
* copyout is finished.
*/
ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
btrfs_inode_gid(path.nodes[0], inode_item));
if (ret && !ignore_errors)
goto out;
ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
if (ret && !ignore_errors)
goto out;
bts = btrfs_inode_atime(inode_item);
times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
bts = btrfs_inode_mtime(inode_item);
times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
times_ok = true;
}
}
btrfs_release_path(&path);
key->offset = 0;
key->type = BTRFS_EXTENT_DATA_KEY;
ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
if (ret < 0) {
error("searching extent data returned %d", ret);
goto out;
}
leaf = path.nodes[0];
while (!leaf) {
ret = next_leaf(root, &path);
if (ret < 0) {
error("cannot get next leaf: %d", ret);
goto out;
} else if (ret > 0) {
/* No more leaves to search */
ret = 0;
goto out;
}
leaf = path.nodes[0];
}
while (1) {
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
do {
ret = next_leaf(root, &path);
if (ret < 0) {
error("search to next leaf failed: %d", ret);
goto out;
} else if (ret) {
/* No more leaves to search */
btrfs_release_path(&path);
goto set_size;
}
leaf = path.nodes[0];
} while (!leaf);
continue;
}
btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
if (found_key.objectid != key->objectid)
break;
if (found_key.type != key->type)
break;
fi = btrfs_item_ptr(leaf, path.slots[0],
struct btrfs_file_extent_item);
extent_type = btrfs_file_extent_type(leaf, fi);
compression = btrfs_file_extent_compression(leaf, fi);
if (compression >= BTRFS_NR_COMPRESS_TYPES) {
warning("compression type %d not supported",
compression);
ret = -1;
goto out;
}
if (extent_type == BTRFS_FILE_EXTENT_PREALLOC)
goto next;
if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
ret = copy_one_inline(root, fd, &path, found_key.offset);
if (ret)
goto out;
} else if (extent_type == BTRFS_FILE_EXTENT_REG) {
ret = copy_one_extent(root, fd, leaf, fi,
found_key.offset);
if (ret)
goto out;
} else {
warning("weird extent type %d", extent_type);
}
next:
path.slots[0]++;
}
btrfs_release_path(&path);
set_size:
if (found_size) {
ret = ftruncate(fd, (loff_t)found_size);
if (ret)
return ret;
}
if (get_xattrs) {
ret = set_file_xattrs(root, key->objectid, fd, file);
if (ret)
return ret;
}
if (restore_metadata && times_ok) {
ret = futimens(fd, times);
if (ret)
return ret;
}
return 0;
out:
btrfs_release_path(&path);
return ret;
}
/*
* returns:
* 0 if the file exists and should be skipped.
* 1 if the file does NOT exist
* 2 if the file exists but is OK to overwrite
*/
static int overwrite_ok(const char * path)
{
static int warn = 0;
struct stat st;
int ret;
/* don't be fooled by symlinks */
ret = fstatat(AT_FDCWD, path_name, &st, AT_SYMLINK_NOFOLLOW);
if (!ret) {
if (overwrite)
return 2;
if (!warn) {
pr_verbose(LOG_DEFAULT, "Skipping existing file %s\n", path);
pr_verbose(LOG_DEFAULT, "If you wish to overwrite use -o\n");
} else {
pr_verbose(LOG_INFO, "Skipping existing file %s\n", path);
}
warn = 1;
return 0;
}
return 1;
}
static int copy_symlink(struct btrfs_root *root, struct btrfs_key *key,
const char *file)
{
struct btrfs_path path = { 0 };
struct extent_buffer *leaf;
struct btrfs_file_extent_item *extent_item;
struct btrfs_inode_item *inode_item;
u32 len;
u32 name_offset;
int ret;
struct btrfs_timespec *bts;
struct timespec times[2];
ret = overwrite_ok(path_name);
if (ret == 0)
return 0; /* skip this file */
/* symlink() can't overwrite, so unlink first */
if (ret == 2) {
ret = unlink(path_name);
if (ret) {
error("failed to unlink '%s' for overwrite: %m", path_name);
return ret;
}
}
key->type = BTRFS_EXTENT_DATA_KEY;
key->offset = 0;
ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
if (ret < 0)
goto out;
leaf = path.nodes[0];
if (!leaf) {
error("failed to get leaf for symlink '%s'", file);
ret = -1;
goto out;
}
extent_item = btrfs_item_ptr(leaf, path.slots[0],
struct btrfs_file_extent_item);
len = btrfs_file_extent_inline_item_len(leaf, path.slots[0]);
if (len >= PATH_MAX) {
error("symlink '%s' target length %d is longer than PATH_MAX",
fs_name, len);
ret = -1;
goto out;
}
name_offset = (unsigned long) extent_item
+ offsetof(struct btrfs_file_extent_item, disk_bytenr);
read_extent_buffer(leaf, symlink_target, name_offset, len);
symlink_target[len] = 0;
if (!dry_run) {
ret = symlink(symlink_target, path_name);
if (ret < 0) {
error("failed to restore symlink '%s': %m", path_name);
goto out;
}
}
if (bconf.verbose >= 2)
printf("SYMLINK: '%s' => '%s'\n", path_name, symlink_target);
ret = 0;
if (!restore_metadata)
goto out;
/*
* Symlink metadata operates differently than files/directories, so do
* our own work here.
*/
key->type = BTRFS_INODE_ITEM_KEY;
key->offset = 0;
btrfs_release_path(&path);
ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
if (ret) {
error("failed to lookup inode for '%s'", file);
goto out;
}
inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
struct btrfs_inode_item);
ret = fchownat(AT_FDCWD, file, btrfs_inode_uid(path.nodes[0], inode_item),
btrfs_inode_gid(path.nodes[0], inode_item),
AT_SYMLINK_NOFOLLOW);
if (ret) {
error("failed to change owner of '%s': %m", file);
goto out;
}
bts = btrfs_inode_atime(inode_item);
times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
bts = btrfs_inode_mtime(inode_item);
times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
ret = utimensat(AT_FDCWD, file, times, AT_SYMLINK_NOFOLLOW);
if (ret)
error("failed to set times for '%s': %m", file);
out:
btrfs_release_path(&path);
return ret;
}
static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
const char *output_rootdir, const char *in_dir,
const regex_t *mreg)
{
struct btrfs_path path = { 0 };
struct extent_buffer *leaf;
struct btrfs_dir_item *dir_item;
struct btrfs_key found_key, location;
char filename[BTRFS_NAME_LEN + 1];
unsigned long name_ptr;
int name_len;
int ret = 0;
int fd;
u8 type;
key->offset = 0;
key->type = BTRFS_DIR_INDEX_KEY;
ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
if (ret < 0) {
error("search for next directory entry failed: %d", ret);
goto out;
}
ret = 0;
leaf = path.nodes[0];
while (!leaf) {
pr_verbose(LOG_INFO,
"No leaf after search, looking for the next leaf\n");
ret = next_leaf(root, &path);
if (ret < 0) {
error("search for next leaf failed: %d", ret);
goto out;
} else if (ret > 0) {
/* No more leaves to search */
pr_verbose(LOG_INFO,
"Reached the end of the tree looking for the directory\n");
ret = 0;
goto out;
}
leaf = path.nodes[0];
}
while (leaf) {
if (path.slots[0] >= btrfs_header_nritems(leaf)) {
do {
ret = next_leaf(root, &path);
if (ret < 0) {
error("search for next leaf failed: %d", ret);
goto out;
} else if (ret > 0) {
/* No more leaves to search */
pr_verbose(LOG_INFO,
"Reached the end of the tree searching the directory\n");
ret = 0;
goto out;
}
leaf = path.nodes[0];
} while (!leaf);
continue;
}
btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
if (found_key.objectid != key->objectid) {
pr_verbose(LOG_VERBOSE, "Found objectid=%llu, key=%llu\n",
found_key.objectid, key->objectid);
break;
}
if (found_key.type != key->type) {
pr_verbose(LOG_VERBOSE, "Found type=%u, want=%u\n",
found_key.type, key->type);
break;
}
dir_item = btrfs_item_ptr(leaf, path.slots[0],
struct btrfs_dir_item);
name_ptr = (unsigned long)(dir_item + 1);
name_len = btrfs_dir_name_len(leaf, dir_item);
read_extent_buffer(leaf, filename, name_ptr, name_len);
filename[name_len] = '\0';
type = btrfs_dir_ftype(leaf, dir_item);
btrfs_dir_item_key_to_cpu(leaf, dir_item, &location);
/* full path from root of btrfs being restored */
snprintf(fs_name, PATH_MAX, "%s/%s", in_dir, filename);
if (mreg && REG_NOMATCH == regexec(mreg, fs_name, 0, NULL, 0))
goto next;
/* full path from system root */
snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, fs_name);
/*