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 KiB
C
106 lines
3 KiB
C
/*
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* Copyright (C) STRATO AG 2013. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <uuid/uuid.h>
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#include <sys/ioctl.h>
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#include "ctree.h"
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#include "transaction.h"
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#include "disk-io.h"
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#include "print-tree.h"
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static void btrfs_uuid_to_key(const u8 *uuid, u64 *key_objectid,
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u64 *key_offset)
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{
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*key_objectid = get_unaligned_le64(uuid);
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*key_offset = get_unaligned_le64(uuid + sizeof(u64));
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}
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/* return -ENOENT for !found, < 0 for errors, or 0 if an item was found */
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static int btrfs_uuid_tree_lookup_any(int fd, const u8 *uuid, u8 type,
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u64 *subid)
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{
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int ret;
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u64 key_objectid = 0;
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u64 key_offset;
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struct btrfs_ioctl_search_args search_arg;
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struct btrfs_ioctl_search_header *search_header;
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u32 item_size;
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__le64 lesubid;
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btrfs_uuid_to_key(uuid, &key_objectid, &key_offset);
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memset(&search_arg, 0, sizeof(search_arg));
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search_arg.key.tree_id = BTRFS_UUID_TREE_OBJECTID;
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search_arg.key.min_objectid = key_objectid;
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search_arg.key.max_objectid = key_objectid;
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search_arg.key.min_type = type;
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search_arg.key.max_type = type;
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search_arg.key.min_offset = key_offset;
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search_arg.key.max_offset = key_offset;
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search_arg.key.max_transid = (u64)-1;
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search_arg.key.nr_items = 1;
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ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &search_arg);
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if (ret < 0) {
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fprintf(stderr,
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"ioctl(BTRFS_IOC_TREE_SEARCH, uuid, key %016llx, UUID_KEY, %016llx) ret=%d, error: %m\n",
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(unsigned long long)key_objectid,
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(unsigned long long)key_offset, ret);
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ret = -ENOENT;
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goto out;
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}
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if (search_arg.key.nr_items < 1) {
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ret = -ENOENT;
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goto out;
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}
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search_header = (struct btrfs_ioctl_search_header *)(search_arg.buf);
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item_size = btrfs_search_header_len(search_header);
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if ((item_size & (sizeof(u64) - 1)) || item_size == 0) {
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printf("btrfs: uuid item with illegal size %lu!\n",
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(unsigned long)item_size);
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ret = -ENOENT;
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goto out;
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} else {
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ret = 0;
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}
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/* return first stored id */
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memcpy(&lesubid, search_header + 1, sizeof(lesubid));
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*subid = le64_to_cpu(lesubid);
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out:
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return ret;
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}
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int btrfs_lookup_uuid_subvol_item(int fd, const u8 *uuid, u64 *subvol_id)
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{
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return btrfs_uuid_tree_lookup_any(fd, uuid, BTRFS_UUID_KEY_SUBVOL,
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subvol_id);
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}
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int btrfs_lookup_uuid_received_subvol_item(int fd, const u8 *uuid,
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u64 *subvol_id)
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{
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return btrfs_uuid_tree_lookup_any(fd, uuid,
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BTRFS_UUID_KEY_RECEIVED_SUBVOL,
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subvol_id);
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}
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