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9afc5eee65
Christoph Hellwig suggested a slightly different path for handling backwards compatibility with the 32-bit time_t based system calls: Rather than simply reusing the compat_sys_* entry points on 32-bit architectures unchanged, we get rid of those entry points and the compat_time types by renaming them to something that makes more sense on 32-bit architectures (which don't have a compat mode otherwise), and then share the entry points under the new name with the 64-bit architectures that use them for implementing the compatibility. The following types and interfaces are renamed here, and moved from linux/compat_time.h to linux/time32.h: old new --- --- compat_time_t old_time32_t struct compat_timeval struct old_timeval32 struct compat_timespec struct old_timespec32 struct compat_itimerspec struct old_itimerspec32 ns_to_compat_timeval() ns_to_old_timeval32() get_compat_itimerspec64() get_old_itimerspec32() put_compat_itimerspec64() put_old_itimerspec32() compat_get_timespec64() get_old_timespec32() compat_put_timespec64() put_old_timespec32() As we already have aliases in place, this patch addresses only the instances that are relevant to the system call interface in particular, not those that occur in device drivers and other modules. Those will get handled separately, while providing the 64-bit version of the respective interfaces. I'm not renaming the timex, rusage and itimerval structures, as we are still debating what the new interface will look like, and whether we will need a replacement at all. This also doesn't change the names of the syscall entry points, which can be done more easily when we actually switch over the 32-bit architectures to use them, at that point we need to change COMPAT_SYSCALL_DEFINEx to SYSCALL_DEFINEx with a new name, e.g. with a _time32 suffix. Suggested-by: Christoph Hellwig <hch@infradead.org> Link: https://lore.kernel.org/lkml/20180705222110.GA5698@infradead.org/ Signed-off-by: Arnd Bergmann <arnd@arndb.de>
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* 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
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* GNU 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 License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_STAT_H
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#define __ASM_STAT_H
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#include <uapi/asm/stat.h>
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#ifdef CONFIG_COMPAT
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#include <linux/time.h>
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#include <asm/compat.h>
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/*
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* struct stat64 is needed for compat tasks only. Its definition is different
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* from the generic struct stat64.
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*/
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struct stat64 {
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compat_u64 st_dev;
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unsigned char __pad0[4];
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#define STAT64_HAS_BROKEN_ST_INO 1
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compat_ulong_t __st_ino;
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compat_uint_t st_mode;
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compat_uint_t st_nlink;
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compat_ulong_t st_uid;
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compat_ulong_t st_gid;
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compat_u64 st_rdev;
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unsigned char __pad3[4];
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compat_s64 st_size;
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compat_ulong_t st_blksize;
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compat_u64 st_blocks; /* Number of 512-byte blocks allocated. */
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compat_ulong_t st_atime;
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compat_ulong_t st_atime_nsec;
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compat_ulong_t st_mtime;
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compat_ulong_t st_mtime_nsec;
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compat_ulong_t st_ctime;
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compat_ulong_t st_ctime_nsec;
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compat_u64 st_ino;
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};
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#endif
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#endif
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