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freebsd-nq/sys/compat/linux/linux_stats.c
Bruce Evans ab35e1c71b Fix the encoding of major and minor numbers in 64-bit dev_t by restoring 
the old encodings for the lower 16 and 32 bits and only using the
higher 32 bits for unusually large major and minor numbers.  This
change breaks compatibility with the previous encoding (which was only
used in -current).

Fix truncation to (essentially) 16-bit dev_t in newnfs v3.

Any encoding of device numbers gives an ABI, so it can't be changed
without translations for compatibility.  Extra bits give the much
larger complication that the translations need to compress into fewer
bits.  Fortunately, more than 32 bits are rarely needed, so
compression is rarely needed except for 16-bit linux dev_t where it
was always needed but never done.

The previous encoding moved the major number into the top 32 bits.
Almost no translation code handled this, so the major number was blindly
truncated away in most 32-bit encodings.  E.g., for ffs, mknod(8) with
major = 1 and minor = 2 gave dev_t = 0x10000002; ffs cannot represent
this and blindly truncated it to 2.  But if this mknod was run on any
released version of FreeBSD, it gives dev_t = 0x102.  ffs can represent
this, but in the previous encoding it was not decoded, giving major = 0,
minor = 0x102.

The presence of bugs was most obvious for exporting dev_t's from an
old system to -current, since bugs in newnfs augment them.  I fixed
oldnfs to support 32-bit dev_t in 1996 (r16634), but this regressed
to 16-bit dev_t in newnfs, first to the old 16-bit encoding and then
further in -current.  E.g., old ad0 with major = 234, minor = 0x10002
had the correct (major, minor) number on the wire, but newnfs truncated
this to (234, 2) and then the previous encoding shifted the major
number into oblivion as seen by ffs or old applications.

I first tried to fix this by translating on every ABI/API boundary, but
there are too many boundaries and too many sloppy translations by blind
truncation.  So use the old encoding for the low 32 bits so that sloppy
translations work no worse than before provided the high 32 bits are
not set.  Add some error checking for when bits are lost.  Keep not
doing any error checking for translations for almost everything in
compat/linux.

compat/freebsd32/freebsd32_misc.c:
Optionally check for losing bits after possibly-truncating assignments as
before.

compat/linux/linux_stats.c:
Depend on the representation being compatible with Linux's (or just with
itself for local use) and spell some of the translations as assignments in
a macro that hides the details.

fs/nfsclient/nfs_clcomsubs.c:
Essentially the same fix as in 1996, except there is now no possible
truncation in makedev() itself.  Also fix nearby style bugs.

kern/vfs_syscalls.c:
As for freebsd32.  Also update the sysctl description to include file
numbers, and change it to describe device ids as device numbers.

sys/types.h:
Use inline functions (wrapped by macros) since the expressions are now
a bit too complicated for plain macros.  Describe the encoding and
some of the reasons for it.  16-bit compatibility didn't leave many
reasonable choices for the 32-bit encoding, and 32-bit compatibility
doesn't leave many reasonable choices for the 64-bit encoding.  My
choice is to put the 8 new minor bits in the low 8 bits of the top 32
bits.  This minimizes discontiguities.

Reviewed by:	kib (except for rewrite of the comment in linux_stats.c)
2018-06-13 12:22:00 +00:00

731 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1994-1995 Søren Schmidt
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/dirent.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/stat.h>
#include <sys/syscallsubr.h>
#include <sys/systm.h>
#include <sys/tty.h>
#include <sys/vnode.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif
#include <compat/linux/linux_util.h>
#include <compat/linux/linux_file.h>
static void
translate_vnhook_major_minor(struct vnode *vp, struct stat *sb)
{
int major, minor;
if (vp->v_type == VCHR && vp->v_rdev != NULL &&
linux_driver_get_major_minor(devtoname(vp->v_rdev),
&major, &minor) == 0) {
sb->st_rdev = (major << 8 | minor);
}
}
static int
linux_kern_statat(struct thread *td, int flag, int fd, char *path,
enum uio_seg pathseg, struct stat *sbp)
{
return (kern_statat(td, flag, fd, path, pathseg, sbp,
translate_vnhook_major_minor));
}
static int
linux_kern_stat(struct thread *td, char *path, enum uio_seg pathseg,
struct stat *sbp)
{
return (linux_kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
}
static int
linux_kern_lstat(struct thread *td, char *path, enum uio_seg pathseg,
struct stat *sbp)
{
return (linux_kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
pathseg, sbp));
}
static void
translate_fd_major_minor(struct thread *td, int fd, struct stat *buf)
{
struct file *fp;
struct vnode *vp;
int major, minor;
/*
* No capability rights required here.
*/
if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) ||
fget(td, fd, &cap_no_rights, &fp) != 0)
return;
vp = fp->f_vnode;
if (vp != NULL && vp->v_rdev != NULL &&
linux_driver_get_major_minor(devtoname(vp->v_rdev),
&major, &minor) == 0) {
buf->st_rdev = (major << 8 | minor);
} else if (fp->f_type == DTYPE_PTS) {
struct tty *tp = fp->f_data;
/* Convert the numbers for the slave device. */
if (linux_driver_get_major_minor(devtoname(tp->t_dev),
&major, &minor) == 0) {
buf->st_rdev = (major << 8 | minor);
}
}
fdrop(fp, td);
}
/*
* l_dev_t has the same encoding as dev_t in the latter's low 16 bits, so
* don't bother going through major() and minor(). Keep doing blind
* truncation, as for other fields. The previous version didn't even do
* blind truncation after dev_t was expanded to 64 bits. It failed to
* mask out bits 8-15 in minor(). These bits can only be nonzero in th
* 64-bit version.
*
* This is only used for st_dev. st_dev is for the mounted-on device so
* it can't be a device that needs very special translation. The translation
* of blind truncation is done here. st_rdev is supposed to be specially
* translated in callers, with the blind truncation done there too and
* st_rdev in the native struct state abused to hold the linux st_rdev.
* Callers do the last step using an open-coded Linux makedev().
*/
#define dev_to_ldev(d) ((uint16_t)(d))
static int
newstat_copyout(struct stat *buf, void *ubuf)
{
struct l_newstat tbuf;
bzero(&tbuf, sizeof(tbuf));
tbuf.st_dev = dev_to_ldev(buf->st_dev);
tbuf.st_ino = buf->st_ino;
tbuf.st_mode = buf->st_mode;
tbuf.st_nlink = buf->st_nlink;
tbuf.st_uid = buf->st_uid;
tbuf.st_gid = buf->st_gid;
tbuf.st_rdev = buf->st_rdev;
tbuf.st_size = buf->st_size;
tbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
tbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
tbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
tbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
tbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
tbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
tbuf.st_blksize = buf->st_blksize;
tbuf.st_blocks = buf->st_blocks;
return (copyout(&tbuf, ubuf, sizeof(tbuf)));
}
int
linux_newstat(struct thread *td, struct linux_newstat_args *args)
{
struct stat buf;
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(newstat))
printf(ARGS(newstat, "%s, *"), path);
#endif
error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
LFREEPATH(path);
if (error)
return (error);
return (newstat_copyout(&buf, args->buf));
}
int
linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
{
struct stat sb;
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(newlstat))
printf(ARGS(newlstat, "%s, *"), path);
#endif
error = linux_kern_lstat(td, path, UIO_SYSSPACE, &sb);
LFREEPATH(path);
if (error)
return (error);
return (newstat_copyout(&sb, args->buf));
}
int
linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
{
struct stat buf;
int error;
#ifdef DEBUG
if (ldebug(newfstat))
printf(ARGS(newfstat, "%d, *"), args->fd);
#endif
error = kern_fstat(td, args->fd, &buf);
translate_fd_major_minor(td, args->fd, &buf);
if (!error)
error = newstat_copyout(&buf, args->buf);
return (error);
}
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
static int
stat_copyout(struct stat *buf, void *ubuf)
{
struct l_stat lbuf;
bzero(&lbuf, sizeof(lbuf));
lbuf.st_dev = dev_to_ldev(buf->st_dev);
lbuf.st_ino = buf->st_ino;
lbuf.st_mode = buf->st_mode;
lbuf.st_nlink = buf->st_nlink;
lbuf.st_uid = buf->st_uid;
lbuf.st_gid = buf->st_gid;
lbuf.st_rdev = buf->st_rdev;
lbuf.st_size = MIN(buf->st_size, INT32_MAX);
lbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
lbuf.st_blksize = buf->st_blksize;
lbuf.st_blocks = buf->st_blocks;
lbuf.st_flags = buf->st_flags;
lbuf.st_gen = buf->st_gen;
return (copyout(&lbuf, ubuf, sizeof(lbuf)));
}
int
linux_stat(struct thread *td, struct linux_stat_args *args)
{
struct stat buf;
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(stat))
printf(ARGS(stat, "%s, *"), path);
#endif
error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
if (error) {
LFREEPATH(path);
return (error);
}
LFREEPATH(path);
return (stat_copyout(&buf, args->up));
}
int
linux_lstat(struct thread *td, struct linux_lstat_args *args)
{
struct stat buf;
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(lstat))
printf(ARGS(lstat, "%s, *"), path);
#endif
error = linux_kern_lstat(td, path, UIO_SYSSPACE, &buf);
if (error) {
LFREEPATH(path);
return (error);
}
LFREEPATH(path);
return (stat_copyout(&buf, args->up));
}
#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
struct l_statfs {
l_long f_type;
l_long f_bsize;
l_long f_blocks;
l_long f_bfree;
l_long f_bavail;
l_long f_files;
l_long f_ffree;
l_fsid_t f_fsid;
l_long f_namelen;
l_long f_frsize;
l_long f_flags;
l_long f_spare[4];
};
#define LINUX_CODA_SUPER_MAGIC 0x73757245L
#define LINUX_EXT2_SUPER_MAGIC 0xEF53L
#define LINUX_HPFS_SUPER_MAGIC 0xf995e849L
#define LINUX_ISOFS_SUPER_MAGIC 0x9660L
#define LINUX_MSDOS_SUPER_MAGIC 0x4d44L
#define LINUX_NCP_SUPER_MAGIC 0x564cL
#define LINUX_NFS_SUPER_MAGIC 0x6969L
#define LINUX_NTFS_SUPER_MAGIC 0x5346544EL
#define LINUX_PROC_SUPER_MAGIC 0x9fa0L
#define LINUX_UFS_SUPER_MAGIC 0x00011954L /* XXX - UFS_MAGIC in Linux */
#define LINUX_ZFS_SUPER_MAGIC 0x2FC12FC1
#define LINUX_DEVFS_SUPER_MAGIC 0x1373L
#define LINUX_SHMFS_MAGIC 0x01021994
static long
bsd_to_linux_ftype(const char *fstypename)
{
int i;
static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
{"ufs", LINUX_UFS_SUPER_MAGIC},
{"zfs", LINUX_ZFS_SUPER_MAGIC},
{"cd9660", LINUX_ISOFS_SUPER_MAGIC},
{"nfs", LINUX_NFS_SUPER_MAGIC},
{"ext2fs", LINUX_EXT2_SUPER_MAGIC},
{"procfs", LINUX_PROC_SUPER_MAGIC},
{"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
{"ntfs", LINUX_NTFS_SUPER_MAGIC},
{"nwfs", LINUX_NCP_SUPER_MAGIC},
{"hpfs", LINUX_HPFS_SUPER_MAGIC},
{"coda", LINUX_CODA_SUPER_MAGIC},
{"devfs", LINUX_DEVFS_SUPER_MAGIC},
{"tmpfs", LINUX_SHMFS_MAGIC},
{NULL, 0L}};
for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
return (b2l_tbl[i].linux_type);
return (0L);
}
static int
bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
{
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
uint64_t tmp;
#define LINUX_HIBITS 0xffffffff00000000ULL
tmp = bsd_statfs->f_blocks | bsd_statfs->f_bfree | bsd_statfs->f_files |
bsd_statfs->f_bsize;
if ((bsd_statfs->f_bavail != -1 && (bsd_statfs->f_bavail & LINUX_HIBITS)) ||
(bsd_statfs->f_ffree != -1 && (bsd_statfs->f_ffree & LINUX_HIBITS)) ||
(tmp & LINUX_HIBITS))
return (EOVERFLOW);
#undef LINUX_HIBITS
#endif
linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
linux_statfs->f_bsize = bsd_statfs->f_bsize;
linux_statfs->f_blocks = bsd_statfs->f_blocks;
linux_statfs->f_bfree = bsd_statfs->f_bfree;
linux_statfs->f_bavail = bsd_statfs->f_bavail;
linux_statfs->f_ffree = bsd_statfs->f_ffree;
linux_statfs->f_files = bsd_statfs->f_files;
linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
linux_statfs->f_namelen = MAXNAMLEN;
linux_statfs->f_frsize = bsd_statfs->f_bsize;
linux_statfs->f_flags = 0;
memset(linux_statfs->f_spare, 0, sizeof(linux_statfs->f_spare));
return (0);
}
int
linux_statfs(struct thread *td, struct linux_statfs_args *args)
{
struct l_statfs linux_statfs;
struct statfs *bsd_statfs;
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(statfs))
printf(ARGS(statfs, "%s, *"), path);
#endif
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs);
LFREEPATH(path);
if (error == 0)
error = bsd_to_linux_statfs(bsd_statfs, &linux_statfs);
free(bsd_statfs, M_STATFS);
if (error != 0)
return (error);
return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
}
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
static void
bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs)
{
linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
linux_statfs->f_bsize = bsd_statfs->f_bsize;
linux_statfs->f_blocks = bsd_statfs->f_blocks;
linux_statfs->f_bfree = bsd_statfs->f_bfree;
linux_statfs->f_bavail = bsd_statfs->f_bavail;
linux_statfs->f_ffree = bsd_statfs->f_ffree;
linux_statfs->f_files = bsd_statfs->f_files;
linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
linux_statfs->f_namelen = MAXNAMLEN;
linux_statfs->f_frsize = bsd_statfs->f_bsize;
linux_statfs->f_flags = 0;
memset(linux_statfs->f_spare, 0, sizeof(linux_statfs->f_spare));
}
int
linux_statfs64(struct thread *td, struct linux_statfs64_args *args)
{
struct l_statfs64 linux_statfs;
struct statfs *bsd_statfs;
char *path;
int error;
if (args->bufsize != sizeof(struct l_statfs64))
return (EINVAL);
LCONVPATHEXIST(td, args->path, &path);
#ifdef DEBUG
if (ldebug(statfs64))
printf(ARGS(statfs64, "%s, *"), path);
#endif
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_statfs(td, path, UIO_SYSSPACE, bsd_statfs);
LFREEPATH(path);
if (error == 0)
bsd_to_linux_statfs64(bsd_statfs, &linux_statfs);
free(bsd_statfs, M_STATFS);
if (error != 0)
return (error);
return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
}
int
linux_fstatfs64(struct thread *td, struct linux_fstatfs64_args *args)
{
struct l_statfs64 linux_statfs;
struct statfs *bsd_statfs;
int error;
#ifdef DEBUG
if (ldebug(fstatfs64))
printf(ARGS(fstatfs64, "%d, *"), args->fd);
#endif
if (args->bufsize != sizeof(struct l_statfs64))
return (EINVAL);
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_fstatfs(td, args->fd, bsd_statfs);
if (error == 0)
bsd_to_linux_statfs64(bsd_statfs, &linux_statfs);
free(bsd_statfs, M_STATFS);
if (error != 0)
return (error);
return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
}
#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
int
linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
{
struct l_statfs linux_statfs;
struct statfs *bsd_statfs;
int error;
#ifdef DEBUG
if (ldebug(fstatfs))
printf(ARGS(fstatfs, "%d, *"), args->fd);
#endif
bsd_statfs = malloc(sizeof(struct statfs), M_STATFS, M_WAITOK);
error = kern_fstatfs(td, args->fd, bsd_statfs);
if (error == 0)
error = bsd_to_linux_statfs(bsd_statfs, &linux_statfs);
free(bsd_statfs, M_STATFS);
if (error != 0)
return (error);
return (copyout(&linux_statfs, args->buf, sizeof(linux_statfs)));
}
struct l_ustat
{
l_daddr_t f_tfree;
l_ino_t f_tinode;
char f_fname[6];
char f_fpack[6];
};
int
linux_ustat(struct thread *td, struct linux_ustat_args *args)
{
#ifdef DEBUG
if (ldebug(ustat))
printf(ARGS(ustat, "%ju, *"), (uintmax_t)args->dev);
#endif
return (EOPNOTSUPP);
}
#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
static int
stat64_copyout(struct stat *buf, void *ubuf)
{
struct l_stat64 lbuf;
bzero(&lbuf, sizeof(lbuf));
lbuf.st_dev = dev_to_ldev(buf->st_dev);
lbuf.st_ino = buf->st_ino;
lbuf.st_mode = buf->st_mode;
lbuf.st_nlink = buf->st_nlink;
lbuf.st_uid = buf->st_uid;
lbuf.st_gid = buf->st_gid;
lbuf.st_rdev = buf->st_rdev;
lbuf.st_size = buf->st_size;
lbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
lbuf.st_blksize = buf->st_blksize;
lbuf.st_blocks = buf->st_blocks;
/*
* The __st_ino field makes all the difference. In the Linux kernel
* it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
* but without the assignment to __st_ino the runtime linker refuses
* to mmap(2) any shared libraries. I guess it's broken alright :-)
*/
lbuf.__st_ino = buf->st_ino;
return (copyout(&lbuf, ubuf, sizeof(lbuf)));
}
int
linux_stat64(struct thread *td, struct linux_stat64_args *args)
{
struct stat buf;
char *filename;
int error;
LCONVPATHEXIST(td, args->filename, &filename);
#ifdef DEBUG
if (ldebug(stat64))
printf(ARGS(stat64, "%s, *"), filename);
#endif
error = linux_kern_stat(td, filename, UIO_SYSSPACE, &buf);
LFREEPATH(filename);
if (error)
return (error);
return (stat64_copyout(&buf, args->statbuf));
}
int
linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
{
struct stat sb;
char *filename;
int error;
LCONVPATHEXIST(td, args->filename, &filename);
#ifdef DEBUG
if (ldebug(lstat64))
printf(ARGS(lstat64, "%s, *"), args->filename);
#endif
error = linux_kern_lstat(td, filename, UIO_SYSSPACE, &sb);
LFREEPATH(filename);
if (error)
return (error);
return (stat64_copyout(&sb, args->statbuf));
}
int
linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
{
struct stat buf;
int error;
#ifdef DEBUG
if (ldebug(fstat64))
printf(ARGS(fstat64, "%d, *"), args->fd);
#endif
error = kern_fstat(td, args->fd, &buf);
translate_fd_major_minor(td, args->fd, &buf);
if (!error)
error = stat64_copyout(&buf, args->statbuf);
return (error);
}
int
linux_fstatat64(struct thread *td, struct linux_fstatat64_args *args)
{
char *path;
int error, dfd, flag;
struct stat buf;
if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
return (EINVAL);
flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ?
AT_SYMLINK_NOFOLLOW : 0;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
#ifdef DEBUG
if (ldebug(fstatat64))
printf(ARGS(fstatat64, "%i, %s, %i"), args->dfd, path, args->flag);
#endif
error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf);
if (!error)
error = stat64_copyout(&buf, args->statbuf);
LFREEPATH(path);
return (error);
}
#else /* __amd64__ && !COMPAT_LINUX32 */
int
linux_newfstatat(struct thread *td, struct linux_newfstatat_args *args)
{
char *path;
int error, dfd, flag;
struct stat buf;
if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
return (EINVAL);
flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ?
AT_SYMLINK_NOFOLLOW : 0;
dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
#ifdef DEBUG
if (ldebug(newfstatat))
printf(ARGS(newfstatat, "%i, %s, %i"), args->dfd, path, args->flag);
#endif
error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf);
if (error == 0)
error = newstat_copyout(&buf, args->statbuf);
LFREEPATH(path);
return (error);
}
#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
int
linux_syncfs(struct thread *td, struct linux_syncfs_args *args)
{
struct mount *mp;
struct vnode *vp;
int error, save;
error = fgetvp(td, args->fd, &cap_fsync_rights, &vp);
if (error != 0)
/*
* Linux syncfs() returns only EBADF, however fgetvp()
* can return EINVAL in case of file descriptor does
* not represent a vnode. XXX.
*/
return (error);
mp = vp->v_mount;
mtx_lock(&mountlist_mtx);
error = vfs_busy(mp, MBF_MNTLSTLOCK);
if (error != 0) {
/* See comment above. */
mtx_unlock(&mountlist_mtx);
goto out;
}
if ((mp->mnt_flag & MNT_RDONLY) == 0 &&
vn_start_write(NULL, &mp, V_NOWAIT) == 0) {
save = curthread_pflags_set(TDP_SYNCIO);
vfs_msync(mp, MNT_NOWAIT);
VFS_SYNC(mp, MNT_NOWAIT);
curthread_pflags_restore(save);
vn_finished_write(mp);
}
vfs_unbusy(mp);
out:
vrele(vp);
return (error);
}
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