FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_stats.c

     /*-
      * 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: releng/11.2/sys/compat/linux/linux_stats.c 330997 2018-03-15 12:56:22Z emaste $");
    
    #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;
           cap_rights_t rights;
           int major, minor;
   
           /*
            * No capability rights required here.
            */
           if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) ||
               fget(td, fd, cap_rights_init(&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);
   }
   
   static int
   newstat_copyout(struct stat *buf, void *ubuf)
   {
           struct l_newstat tbuf;
   
           bzero(&tbuf, sizeof(tbuf));
           tbuf.st_dev = minor(buf->st_dev) | (major(buf->st_dev) << 8);
           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 = 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;
           if (buf->st_size < (quad_t)1 << 32)
                   lbuf.st_size = buf->st_size;
           else
                   lbuf.st_size = -2;
           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 = minor(buf->st_dev) | (major(buf->st_dev) << 8);
           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)
   {
           cap_rights_t rights;
           struct mount *mp;
           struct vnode *vp;
           int error, save;
   
           error = fgetvp(td, args->fd, cap_rights_init(&rights, CAP_FSYNC), &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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