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6073bae64c
It implements all the required syscall for the all Linux kABIS on
fstatat{64} instead of calling fxstatat{64}.
On non-LFS implementation, it handles 3 cases:
1. New kABIs which uses generic pre 64-bit time Linux ABI (csky and
nios): it issues __NR_fstat64 plus handle the overflow on st_ino,
st_size, or st_blocks.
2. Old KABIs with old non-LFS support (arm, i386, hppa, m68k,
microblaze, mips32, s390, sh, powerpc, and sparc32): it issues
__NR_fstatat64 and convert the result to struct stat.
3. 64-bit kABI outliers (mips64 and mips64-n32): it issues
__NR_newfstatat and convert the result to struct stat.
The generic LFS implementation handles multiple cases:
1. XSTAT_IS_XSTAT64 being 1:
1.1. 64-bit kABI (aarch64, ia64, powerpc64*, s390x, riscv64, and
x86_64): it issues __NR_newfstatat.
1.2. 64-bit kABI outlier (alpha): it issues __NR_fstatat64.
1.3. 64-bit kABI outlier where struct stat64 does not match kernel
one (sparc64): it issues __NR_fstatat64 and convert the result
to struct stat64.
1.4. 32-bit kABI with default 64-bit time_t (arc, riscv32): it
issues __NR_statx and convert the result to struct stat64.
2. Old ABIs with XSTAT_IS_XSTAT64 being 0:
2.1. All kABIs with non-LFS support (arm, csky, i386, hppa, m68k,
microblaze, nios2, sh, powerpc32, and sparc32): it issues
__NR_fstatat64.
2.2. 64-bit kABI outliers (mips64 and mips64-n32): it issues
__NR_newfstatat and convert the result to struct stat64.
It allows to remove all the hidden definitions from the {f,l}xstat{64}
(some are still kept because Hurd requires it).
Checked with a build for all affected ABIs. I also checked on x86_64,
i686, powerpc, powerpc64le, sparcv9, sparc64, s390, and s390x.
Reviewed-by: Lukasz Majewski <lukma@denx.de>
81 lines
2.8 KiB
C
81 lines
2.8 KiB
C
/* Struct stat/stat64 to stat/stat64 conversion for Linux.
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/stat.h>
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#include <kernel_stat.h>
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static inline int
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__cp_kstat_stat (const struct kernel_stat *kst, struct stat *st)
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{
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st->st_dev = kst->st_dev;
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memset (&st->st_pad1, 0, sizeof (st->st_pad1));
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st->st_ino = kst->st_ino;
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if (st->st_ino != kst->st_ino)
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
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st->st_mode = kst->st_mode;
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st->st_nlink = kst->st_nlink;
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st->st_uid = kst->st_uid;
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st->st_gid = kst->st_gid;
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st->st_rdev = kst->st_rdev;
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memset (&st->st_pad2, 0, sizeof (st->st_pad2));
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st->st_size = kst->st_size;
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if (st->st_size != kst->st_size)
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
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st->st_pad3 = 0;
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st->st_atim.tv_sec = kst->st_atime_sec;
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st->st_atim.tv_nsec = kst->st_atime_nsec;
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st->st_mtim.tv_sec = kst->st_mtime_sec;
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st->st_mtim.tv_nsec = kst->st_mtime_nsec;
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st->st_ctim.tv_sec = kst->st_ctime_sec;
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st->st_ctim.tv_nsec = kst->st_ctime_nsec;
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st->st_blksize = kst->st_blksize;
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st->st_blocks = kst->st_blocks;
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if (st->st_blocks != kst->st_blocks)
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return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
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memset (&st->st_pad5, 0, sizeof (st->st_pad5));
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return 0;
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}
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static inline int
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__cp_kstat_stat64 (const struct kernel_stat *kst, struct stat64 *st)
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{
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st->st_dev = kst->st_dev;
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memset (&st->st_pad1, 0, sizeof (st->st_pad1));
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st->st_ino = kst->st_ino;
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st->st_mode = kst->st_mode;
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st->st_nlink = kst->st_nlink;
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st->st_uid = kst->st_uid;
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st->st_gid = kst->st_gid;
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st->st_rdev = kst->st_rdev;
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memset (&st->st_pad2, 0, sizeof (st->st_pad2));
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st->st_pad3 = 0;
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st->st_size = kst->st_size;
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st->st_blksize = kst->st_blksize;
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st->st_blocks = kst->st_blocks;
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st->st_atim.tv_sec = kst->st_atime_sec;
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st->st_atim.tv_nsec = kst->st_atime_nsec;
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st->st_mtim.tv_sec = kst->st_mtime_sec;
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st->st_mtim.tv_nsec = kst->st_mtime_nsec;
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st->st_ctim.tv_sec = kst->st_ctime_sec;
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st->st_ctim.tv_nsec = kst->st_ctime_nsec;
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memset (&st->st_pad4, 0, sizeof (st->st_pad4));
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return 0;
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}
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