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implement fstatat with SYS_statx, conditional on undersized kstat time

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this commit adds a new backend for fstatat (and thereby the whole stat
family) using the SYS_statx syscall, but conditions the new code on
the kernel stat structure's time fields being smaller than time_t. in
principle that should make it all dead code at present, but mips64 has
a broken stat structure with 32-bit time fields despite having 64-bit
time_t elsewhere, so on mips64 it is a functional change that makes
post-Y2038 filesystem timestamps accessible.

whenever the 32-bit archs end up getting 64-bit time_t, regardless of
how that happens, the changes in this commit will automatically take
effect for them too.
This commit is contained in:
Rich Felker 2019-07-18 21:46:33 -04:00
parent 67bf602f14
commit dfc81828f7
1 changed files with 68 additions and 2 deletions
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70
src/stat/fstatat.c
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@ -3,10 +3,65 @@
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <stdint.h>
#include <sys/sysmacros.h>
#include "syscall.h"
#include "kstat.h"
int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
struct statx {
uint32_t stx_mask;
uint32_t stx_blksize;
uint64_t stx_attributes;
uint32_t stx_nlink;
uint32_t stx_uid;
uint32_t stx_gid;
uint16_t stx_mode;
uint16_t pad1;
uint64_t stx_ino;
uint64_t stx_size;
uint64_t stx_blocks;
uint64_t stx_attributes_mask;
struct {
int64_t tv_sec;
uint32_t tv_nsec;
int32_t pad;
} stx_atime, stx_btime, stx_ctime, stx_mtime;
uint32_t stx_rdev_major;
uint32_t stx_rdev_minor;
uint32_t stx_dev_major;
uint32_t stx_dev_minor;
uint64_t spare[14];
} stx;
static int fstatat_statx(int fd, const char *restrict path, struct stat *restrict st, int flag)
{
struct statx stx;
int ret = __syscall(SYS_statx, fd, path, flag, 0x7ff, &stx);
if (ret) return ret;
*st = (struct stat){
.st_dev = makedev(stx.stx_dev_major, stx.stx_dev_minor),
.st_ino = stx.stx_ino,
.st_mode = stx.stx_mode,
.st_nlink = stx.stx_nlink,
.st_uid = stx.stx_uid,
.st_gid = stx.stx_gid,
.st_rdev = makedev(stx.stx_rdev_major, stx.stx_rdev_minor),
.st_size = stx.stx_size,
.st_blksize = stx.stx_blksize,
.st_blocks = stx.stx_blocks,
.st_atim.tv_sec = stx.stx_atime.tv_sec,
.st_atim.tv_nsec = stx.stx_atime.tv_nsec,
.st_mtim.tv_sec = stx.stx_mtime.tv_sec,
.st_mtim.tv_nsec = stx.stx_mtime.tv_nsec,
.st_ctim.tv_sec = stx.stx_ctime.tv_sec,
.st_ctim.tv_nsec = stx.stx_ctime.tv_nsec,
};
return 0;
}
static int fstatat_kstat(int fd, const char *restrict path, struct stat *restrict st, int flag)
{
int ret;
struct kstat kst;
@ -36,7 +91,7 @@ int fstatat(int fd, const char *restrict path, struct stat *restrict st, int fla
#endif
else ret = __syscall(SYS_fstatat, fd, path, &kst, flag);
if (ret) return __syscall_ret(ret);
if (ret) return ret;
*st = (struct stat){
.st_dev = kst.st_dev,
@ -60,4 +115,15 @@ int fstatat(int fd, const char *restrict path, struct stat *restrict st, int fla
return 0;
}
int fstatat(int fd, const char *restrict path, struct stat *restrict st, int flag)
{
int ret;
if (sizeof((struct kstat){0}.st_atime_sec) < sizeof(time_t)) {
ret = fstatat_statx(fd, path, st, flag);
if (ret!=-ENOSYS) return __syscall_ret(ret);
}
ret = fstatat_kstat(fd, path, st, flag);
return __syscall_ret(ret);
}
weak_alias(fstatat, fstatat64);