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linux: Consolidate statfs implementations

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The __NR_statfs64 syscall is supported on all architectures but
aarch64, mips64, riscv64, and x86_64.  And newer ABIs also uses
the new statfs64 interface (where the struct size is used as
second argument).

So the default implementation now uses:

  1. __NR_statfs64 for non-LFS call and handle overflow directly
     There is no need to handle __NR_statfs since all architectures
     that only support are LFS only.

  2. __NR_statfs if defined or __NR_statfs64 otherwise for LFS
     call.

Alpha is the only outlier, since it is a 64-bit architecture which
provides non-LFS interface and only provides __NR_statfs64 on
newer kernels (v5.1+).

Checked on x86_64-linux-gnu.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella
2021-02-05 21:26:57 +00:00
parent 1bfbaf7130
commit f6e616435d
9 changed files with 125 additions and 81 deletions
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69
sysdeps/unix/sysv/linux/statfs64.c
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@ -16,79 +16,26 @@
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <string.h>
#include <stddef.h>
#define __statfs __statfs_disable
#define statfs statfs_disable
#include <sys/statfs.h>
#include <sysdep.h>
#include <kernel_stat.h>
/* Hide the prototypes for __statfs and statfs so that GCC will not
complain about the different function signatures if they are aliased
to __stat64. If STATFS_IS_STATFS64 is not zero then the statfs and
statfs64 structures have an identical layout but different type names. */
#if STATFS_IS_STATFS64
# define __statfs __statfs_disable
# define statfs statfs_disable
#endif
#include <sys/statfs.h>
#include <kernel-features.h>
# if __ASSUME_STATFS64 == 0
int __no_statfs64 attribute_hidden;
#endif
#undef __statfs
#undef statfs
/* Return information about the filesystem on which FILE resides. */
int
__statfs64 (const char *file, struct statfs64 *buf)
{
#ifdef __NR_statfs64
# if __ASSUME_STATFS64 == 0
if (! __no_statfs64)
# endif
{
int result = INLINE_SYSCALL (statfs64, 3, file, sizeof (*buf), buf);
# if __ASSUME_STATFS64 == 0
if (result == 0 || errno != ENOSYS)
# endif
return result;
# if __ASSUME_STATFS64 == 0
__no_statfs64 = 1;
# endif
}
#endif
#if __ASSUME_STATFS64 == 0
struct statfs buf32;
if (__statfs (file, &buf32) < 0)
return -1;
buf->f_type = buf32.f_type;
buf->f_bsize = buf32.f_bsize;
buf->f_blocks = buf32.f_blocks;
buf->f_bfree = buf32.f_bfree;
buf->f_bavail = buf32.f_bavail;
buf->f_files = buf32.f_files;
buf->f_ffree = buf32.f_ffree;
buf->f_fsid = buf32.f_fsid;
buf->f_namelen = buf32.f_namelen;
buf->f_frsize = buf32.f_frsize;
buf->f_flags = buf32.f_flags;
memcpy (buf->f_spare, buf32.f_spare, sizeof (buf32.f_spare));
return 0;
return INLINE_SYSCALL_CALL (statfs64, file, sizeof (*buf), buf);
#else
return INLINE_SYSCALL_CALL (statfs, file, buf);
#endif
}
weak_alias (__statfs64, statfs64)
#undef __statfs
#undef statfs
#if STATFS_IS_STATFS64
weak_alias (__statfs64, __statfs)
weak_alias (__statfs64, statfs)