mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-27 08:32:20 +00:00
e4df433b8a
As btrfs is specific to Linux, %m can be used instead of strerror(errno) in format strings. This has some size reduction benefits for embedded systems. glibc, musl, and uclibc-ng all support %m as a modifier to printf. A quick glance at the BIONIC libc source indicates that it has support for %m as well. BSDs and Windows do not but I do believe them to be beyond the scope of btrfs-progs. Compiled sizes on Ubuntu 16.04: Before: 3916512 btrfs 233688 libbtrfs.so.0.1 4899 bcp 2367672 btrfs-convert 2208488 btrfs-corrupt-block 13302 btrfs-debugfs 2152160 btrfs-debug-tree 2136024 btrfs-find-root 2287592 btrfs-image 2144600 btrfs-map-logical 2130760 btrfs-select-super 2152608 btrfstune 2131760 btrfs-zero-log 2277752 mkfs.btrfs 9166 show-blocks After: 3908744 btrfs 233256 libbtrfs.so.0.1 4899 bcp 2366560 btrfs-convert 2207432 btrfs-corrupt-block 13302 btrfs-debugfs 2151104 btrfs-debug-tree 2134968 btrfs-find-root 2281864 btrfs-image 2143536 btrfs-map-logical 2129704 btrfs-select-super 2151552 btrfstune 2130696 btrfs-zero-log 2276272 mkfs.btrfs 9166 show-blocks Total savings: 23928 (24 kilo)bytes Signed-off-by: Rosen Penev <rosenp@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*
|
|
* Copyright (C) STRATO AG 2013. 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 <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <uuid/uuid.h>
|
|
#include <sys/ioctl.h>
|
|
#include "ctree.h"
|
|
#include "transaction.h"
|
|
#include "disk-io.h"
|
|
#include "print-tree.h"
|
|
|
|
|
|
static void btrfs_uuid_to_key(const u8 *uuid, u64 *key_objectid,
|
|
u64 *key_offset)
|
|
{
|
|
*key_objectid = get_unaligned_le64(uuid);
|
|
*key_offset = get_unaligned_le64(uuid + sizeof(u64));
|
|
}
|
|
|
|
|
|
/* return -ENOENT for !found, < 0 for errors, or 0 if an item was found */
|
|
static int btrfs_uuid_tree_lookup_any(int fd, const u8 *uuid, u8 type,
|
|
u64 *subid)
|
|
{
|
|
int ret;
|
|
u64 key_objectid = 0;
|
|
u64 key_offset;
|
|
struct btrfs_ioctl_search_args search_arg;
|
|
struct btrfs_ioctl_search_header *search_header;
|
|
u32 item_size;
|
|
__le64 lesubid;
|
|
|
|
btrfs_uuid_to_key(uuid, &key_objectid, &key_offset);
|
|
|
|
memset(&search_arg, 0, sizeof(search_arg));
|
|
search_arg.key.tree_id = BTRFS_UUID_TREE_OBJECTID;
|
|
search_arg.key.min_objectid = key_objectid;
|
|
search_arg.key.max_objectid = key_objectid;
|
|
search_arg.key.min_type = type;
|
|
search_arg.key.max_type = type;
|
|
search_arg.key.min_offset = key_offset;
|
|
search_arg.key.max_offset = key_offset;
|
|
search_arg.key.max_transid = (u64)-1;
|
|
search_arg.key.nr_items = 1;
|
|
ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_arg);
|
|
if (ret < 0) {
|
|
fprintf(stderr,
|
|
"ioctl(BTRFS_IOC_TREE_SEARCH, uuid, key %016llx, UUID_KEY, %016llx) ret=%d, error: %m\n",
|
|
(unsigned long long)key_objectid,
|
|
(unsigned long long)key_offset, ret);
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
if (search_arg.key.nr_items < 1) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
search_header = (struct btrfs_ioctl_search_header *)(search_arg.buf);
|
|
item_size = btrfs_search_header_len(search_header);
|
|
if ((item_size & (sizeof(u64) - 1)) || item_size == 0) {
|
|
printf("btrfs: uuid item with illegal size %lu!\n",
|
|
(unsigned long)item_size);
|
|
ret = -ENOENT;
|
|
goto out;
|
|
} else {
|
|
ret = 0;
|
|
}
|
|
|
|
/* return first stored id */
|
|
memcpy(&lesubid, search_header + 1, sizeof(lesubid));
|
|
*subid = le64_to_cpu(lesubid);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id)
|
|
{
|
|
return btrfs_uuid_tree_lookup_any(fd, uuid, BTRFS_UUID_KEY_SUBVOL,
|
|
subvol_id);
|
|
}
|
|
|
|
int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
|
|
u64 *subvol_id)
|
|
{
|
|
return btrfs_uuid_tree_lookup_any(fd, uuid,
|
|
BTRFS_UUID_KEY_RECEIVED_SUBVOL,
|
|
subvol_id);
|
|
}
|