mirror of
https://github.com/kdave/btrfs-progs
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95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/*
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* Copyright (C) 2018 Facebook
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*
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* This file is part of libbtrfsutil.
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*
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* libbtrfsutil is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* libbtrfsutil 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
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libbtrfsutil. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef BTRFS_UTIL_INTERNAL_H
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#define BTRFS_UTIL_INTERNAL_H
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#include <asm/byteorder.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "btrfsutil.h"
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#include "btrfs.h"
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#include "btrfs_tree.h"
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#define PUBLIC __attribute__((visibility("default")))
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#define LIBBTRFSUTIL_ALIAS(orig) __attribute__((alias(#orig)))
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#define le16_to_cpu __le16_to_cpu
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#define le32_to_cpu __le32_to_cpu
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#define le64_to_cpu __le64_to_cpu
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#define SAVE_ERRNO_AND_CLOSE(fd) do { \
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int saved_errno = errno; \
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\
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close(fd); \
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errno = saved_errno; \
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} while (0)
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struct __unagligned_u16 { __le16 x; } __attribute__((__packed__));
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struct __unagligned_u32 { __le32 x; } __attribute__((__packed__));
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struct __unagligned_u64 { __le64 x; } __attribute__((__packed__));
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static inline __u16 get_unaligned_le16(const void *ptr)
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{
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return le16_to_cpu(((const struct __unagligned_u16 *)(ptr))->x);
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}
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static inline __u32 get_unaligned_le32(const void *ptr)
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{
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return le32_to_cpu(((const struct __unagligned_u32 *)(ptr))->x);
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}
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static inline __u64 get_unaligned_le64(const void *ptr)
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{
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return le64_to_cpu(((const struct __unagligned_u64 *)(ptr))->x);
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}
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/*
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* Accessors of search header that is commonly mapped to a byte buffer so the
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* alignment is not guaranteed. This is always CPU order.
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*/
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static inline __u64 btrfs_search_header_transid(const struct btrfs_ioctl_search_header *sh)
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{
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return ((const struct __unagligned_u64 *)(const void *)(&sh->transid))->x;
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}
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static inline __u64 btrfs_search_header_objectid(const struct btrfs_ioctl_search_header *sh)
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{
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return ((const struct __unagligned_u64 *)(const void *)(&sh->objectid))->x;
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}
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static inline __u64 btrfs_search_header_offset(const struct btrfs_ioctl_search_header *sh)
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{
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return ((const struct __unagligned_u64 *)(const void *)(&sh->offset))->x;
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}
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static inline __u32 btrfs_search_header_type(const struct btrfs_ioctl_search_header *sh)
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{
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return ((const struct __unagligned_u32 *)(const void *)(&sh->type))->x;
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}
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static inline __u32 btrfs_search_header_len(const struct btrfs_ioctl_search_header *sh)
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{
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return ((const struct __unagligned_u32 *)(const void *)(&sh->len))->x;
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}
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#endif /* BTRFS_UTIL_INTERNAL_H */
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