The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_file.c

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    1 /*-
    2  * Copyright (c) 1994-1995 Søren Schmidt
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer
   10  *    in this position and unchanged.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/8.3/sys/compat/linux/linux_file.c 231146 2012-02-07 19:12:21Z jhb $");
   31 
   32 #include "opt_compat.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/conf.h>
   37 #include <sys/dirent.h>
   38 #include <sys/fcntl.h>
   39 #include <sys/file.h>
   40 #include <sys/filedesc.h>
   41 #include <sys/lock.h>
   42 #include <sys/malloc.h>
   43 #include <sys/mount.h>
   44 #include <sys/mutex.h>
   45 #include <sys/namei.h>
   46 #include <sys/proc.h>
   47 #include <sys/stat.h>
   48 #include <sys/sx.h>
   49 #include <sys/syscallsubr.h>
   50 #include <sys/sysproto.h>
   51 #include <sys/tty.h>
   52 #include <sys/unistd.h>
   53 #include <sys/vnode.h>
   54 
   55 #include <security/mac/mac_framework.h>
   56 
   57 #include <ufs/ufs/extattr.h>
   58 #include <ufs/ufs/quota.h>
   59 #include <ufs/ufs/ufsmount.h>
   60 
   61 #ifdef COMPAT_LINUX32
   62 #include <machine/../linux32/linux.h>
   63 #include <machine/../linux32/linux32_proto.h>
   64 #else
   65 #include <machine/../linux/linux.h>
   66 #include <machine/../linux/linux_proto.h>
   67 #endif
   68 #include <compat/linux/linux_util.h>
   69 #include <compat/linux/linux_file.h>
   70 
   71 int
   72 linux_creat(struct thread *td, struct linux_creat_args *args)
   73 {
   74     char *path;
   75     int error;
   76 
   77     LCONVPATHEXIST(td, args->path, &path);
   78 
   79 #ifdef DEBUG
   80         if (ldebug(creat))
   81                 printf(ARGS(creat, "%s, %d"), path, args->mode);
   82 #endif
   83     error = kern_open(td, path, UIO_SYSSPACE, O_WRONLY | O_CREAT | O_TRUNC,
   84         args->mode);
   85     LFREEPATH(path);
   86     return (error);
   87 }
   88 
   89 
   90 static int
   91 linux_common_open(struct thread *td, int dirfd, char *path, int l_flags, int mode)
   92 {
   93     struct proc *p = td->td_proc;
   94     struct file *fp;
   95     int fd;
   96     int bsd_flags, error;
   97 
   98     bsd_flags = 0;
   99     switch (l_flags & LINUX_O_ACCMODE) {
  100     case LINUX_O_WRONLY:
  101         bsd_flags |= O_WRONLY;
  102         break;
  103     case LINUX_O_RDWR:
  104         bsd_flags |= O_RDWR;
  105         break;
  106     default:
  107         bsd_flags |= O_RDONLY;
  108     }
  109     if (l_flags & LINUX_O_NDELAY)
  110         bsd_flags |= O_NONBLOCK;
  111     if (l_flags & LINUX_O_APPEND)
  112         bsd_flags |= O_APPEND;
  113     if (l_flags & LINUX_O_SYNC)
  114         bsd_flags |= O_FSYNC;
  115     if (l_flags & LINUX_O_NONBLOCK)
  116         bsd_flags |= O_NONBLOCK;
  117     if (l_flags & LINUX_FASYNC)
  118         bsd_flags |= O_ASYNC;
  119     if (l_flags & LINUX_O_CREAT)
  120         bsd_flags |= O_CREAT;
  121     if (l_flags & LINUX_O_TRUNC)
  122         bsd_flags |= O_TRUNC;
  123     if (l_flags & LINUX_O_EXCL)
  124         bsd_flags |= O_EXCL;
  125     if (l_flags & LINUX_O_NOCTTY)
  126         bsd_flags |= O_NOCTTY;
  127     if (l_flags & LINUX_O_DIRECT)
  128         bsd_flags |= O_DIRECT;
  129     if (l_flags & LINUX_O_NOFOLLOW)
  130         bsd_flags |= O_NOFOLLOW;
  131     /* XXX LINUX_O_NOATIME: unable to be easily implemented. */
  132 
  133     error = kern_openat(td, dirfd, path, UIO_SYSSPACE, bsd_flags, mode);
  134 
  135     if (!error) {
  136             fd = td->td_retval[0];
  137             /*
  138              * XXX In between kern_open() and fget(), another process
  139              * having the same filedesc could use that fd without
  140              * checking below.
  141              */
  142             error = fget(td, fd, &fp);
  143             if (!error) {
  144                     sx_slock(&proctree_lock);
  145                     PROC_LOCK(p);
  146                     if (!(bsd_flags & O_NOCTTY) &&
  147                         SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
  148                             PROC_UNLOCK(p);
  149                             sx_unlock(&proctree_lock);
  150                             if (fp->f_type == DTYPE_VNODE)
  151                                     (void) fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0,
  152                                              td->td_ucred, td);
  153                     } else {
  154                             PROC_UNLOCK(p);
  155                             sx_sunlock(&proctree_lock);
  156                     }
  157                     if (l_flags & LINUX_O_DIRECTORY) {
  158                             if (fp->f_type != DTYPE_VNODE ||
  159                                 fp->f_vnode->v_type != VDIR) {
  160                                     error = ENOTDIR;
  161                             }
  162                     }
  163                     fdrop(fp, td);
  164                     /*
  165                      * XXX as above, fdrop()/kern_close() pair is racy.
  166                      */
  167                     if (error)
  168                             kern_close(td, fd);
  169             }
  170     }
  171 
  172 #ifdef DEBUG
  173     if (ldebug(open))
  174             printf(LMSG("open returns error %d"), error);
  175 #endif
  176     LFREEPATH(path);
  177     return (error);
  178 }
  179 
  180 int
  181 linux_openat(struct thread *td, struct linux_openat_args *args)
  182 {
  183         char *path;
  184         int dfd;
  185 
  186         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  187         if (args->flags & LINUX_O_CREAT)
  188                 LCONVPATH_AT(td, args->filename, &path, 1, dfd);
  189         else
  190                 LCONVPATH_AT(td, args->filename, &path, 0, dfd);
  191 #ifdef DEBUG
  192         if (ldebug(openat))
  193                 printf(ARGS(openat, "%i, %s, 0x%x, 0x%x"), args->dfd,
  194                     path, args->flags, args->mode);
  195 #endif
  196         return (linux_common_open(td, dfd, path, args->flags, args->mode));
  197 }
  198 
  199 int
  200 linux_open(struct thread *td, struct linux_open_args *args)
  201 {
  202     char *path;
  203 
  204     if (args->flags & LINUX_O_CREAT)
  205         LCONVPATHCREAT(td, args->path, &path);
  206     else
  207         LCONVPATHEXIST(td, args->path, &path);
  208 
  209 #ifdef DEBUG
  210         if (ldebug(open))
  211                 printf(ARGS(open, "%s, 0x%x, 0x%x"),
  212                     path, args->flags, args->mode);
  213 #endif
  214 
  215         return (linux_common_open(td, AT_FDCWD, path, args->flags, args->mode));
  216 }
  217 
  218 int
  219 linux_lseek(struct thread *td, struct linux_lseek_args *args)
  220 {
  221 
  222     struct lseek_args /* {
  223         int fd;
  224         int pad;
  225         off_t offset;
  226         int whence;
  227     } */ tmp_args;
  228     int error;
  229 
  230 #ifdef DEBUG
  231         if (ldebug(lseek))
  232                 printf(ARGS(lseek, "%d, %ld, %d"),
  233                     args->fdes, (long)args->off, args->whence);
  234 #endif
  235     tmp_args.fd = args->fdes;
  236     tmp_args.offset = (off_t)args->off;
  237     tmp_args.whence = args->whence;
  238     error = lseek(td, &tmp_args);
  239     return error;
  240 }
  241 
  242 int
  243 linux_llseek(struct thread *td, struct linux_llseek_args *args)
  244 {
  245         struct lseek_args bsd_args;
  246         int error;
  247         off_t off;
  248 
  249 #ifdef DEBUG
  250         if (ldebug(llseek))
  251                 printf(ARGS(llseek, "%d, %d:%d, %d"),
  252                     args->fd, args->ohigh, args->olow, args->whence);
  253 #endif
  254         off = (args->olow) | (((off_t) args->ohigh) << 32);
  255 
  256         bsd_args.fd = args->fd;
  257         bsd_args.offset = off;
  258         bsd_args.whence = args->whence;
  259 
  260         if ((error = lseek(td, &bsd_args)))
  261                 return error;
  262 
  263         if ((error = copyout(td->td_retval, args->res, sizeof (off_t))))
  264                 return error;
  265 
  266         td->td_retval[0] = 0;
  267         return 0;
  268 }
  269 
  270 int
  271 linux_readdir(struct thread *td, struct linux_readdir_args *args)
  272 {
  273         struct linux_getdents_args lda;
  274 
  275         lda.fd = args->fd;
  276         lda.dent = args->dent;
  277         lda.count = 1;
  278         return linux_getdents(td, &lda);
  279 }
  280 
  281 /*
  282  * Note that linux_getdents(2) and linux_getdents64(2) have the same
  283  * arguments. They only differ in the definition of struct dirent they
  284  * operate on. We use this to common the code, with the exception of
  285  * accessing struct dirent. Note that linux_readdir(2) is implemented
  286  * by means of linux_getdents(2). In this case we never operate on
  287  * struct dirent64 and thus don't need to handle it...
  288  */
  289 
  290 struct l_dirent {
  291         l_ulong         d_ino;
  292         l_off_t         d_off;
  293         l_ushort        d_reclen;
  294         char            d_name[LINUX_NAME_MAX + 1];
  295 };
  296 
  297 struct l_dirent64 {
  298         uint64_t        d_ino;
  299         int64_t         d_off;
  300         l_ushort        d_reclen;
  301         u_char          d_type;
  302         char            d_name[LINUX_NAME_MAX + 1];
  303 };
  304 
  305 /*
  306  * Linux uses the last byte in the dirent buffer to store d_type,
  307  * at least glibc-2.7 requires it. That is why l_dirent is padded with 2 bytes.
  308  */
  309 #define LINUX_RECLEN(namlen)                                            \
  310     roundup((offsetof(struct l_dirent, d_name) + (namlen) + 2),         \
  311     sizeof(l_ulong))
  312 
  313 #define LINUX_RECLEN64(namlen)                                          \
  314     roundup((offsetof(struct l_dirent64, d_name) + (namlen) + 1),       \
  315     sizeof(uint64_t))
  316 
  317 #define LINUX_MAXRECLEN         max(LINUX_RECLEN(LINUX_NAME_MAX),       \
  318                                     LINUX_RECLEN64(LINUX_NAME_MAX))
  319 #define LINUX_DIRBLKSIZ         512
  320 
  321 static int
  322 getdents_common(struct thread *td, struct linux_getdents64_args *args,
  323     int is64bit)
  324 {
  325         struct dirent *bdp;
  326         struct vnode *vp;
  327         caddr_t inp, buf;               /* BSD-format */
  328         int len, reclen;                /* BSD-format */
  329         caddr_t outp;                   /* Linux-format */
  330         int resid, linuxreclen=0;       /* Linux-format */
  331         caddr_t lbuf;                   /* Linux-format */
  332         struct file *fp;
  333         struct uio auio;
  334         struct iovec aiov;
  335         off_t off;
  336         struct l_dirent *linux_dirent;
  337         struct l_dirent64 *linux_dirent64;
  338         int buflen, error, eofflag, nbytes, justone;
  339         u_long *cookies = NULL, *cookiep;
  340         int ncookies, vfslocked;
  341 
  342         nbytes = args->count;
  343         if (nbytes == 1) {
  344                 /* readdir(2) case. Always struct dirent. */
  345                 if (is64bit)
  346                         return (EINVAL);
  347                 nbytes = sizeof(*linux_dirent);
  348                 justone = 1;
  349         } else
  350                 justone = 0;
  351 
  352         if ((error = getvnode(td->td_proc->p_fd, args->fd, &fp)) != 0)
  353                 return (error);
  354 
  355         if ((fp->f_flag & FREAD) == 0) {
  356                 fdrop(fp, td);
  357                 return (EBADF);
  358         }
  359 
  360         vp = fp->f_vnode;
  361         vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  362         if (vp->v_type != VDIR) {
  363                 VFS_UNLOCK_GIANT(vfslocked);
  364                 fdrop(fp, td);
  365                 return (EINVAL);
  366         }
  367 
  368         off = fp->f_offset;
  369 
  370         buflen = max(LINUX_DIRBLKSIZ, nbytes);
  371         buflen = min(buflen, MAXBSIZE);
  372         buf = malloc(buflen, M_TEMP, M_WAITOK);
  373         lbuf = malloc(LINUX_MAXRECLEN, M_TEMP, M_WAITOK | M_ZERO);
  374         vn_lock(vp, LK_SHARED | LK_RETRY);
  375 
  376         aiov.iov_base = buf;
  377         aiov.iov_len = buflen;
  378         auio.uio_iov = &aiov;
  379         auio.uio_iovcnt = 1;
  380         auio.uio_rw = UIO_READ;
  381         auio.uio_segflg = UIO_SYSSPACE;
  382         auio.uio_td = td;
  383         auio.uio_resid = buflen;
  384         auio.uio_offset = off;
  385 
  386         if (cookies) {
  387                 free(cookies, M_TEMP);
  388                 cookies = NULL;
  389         }
  390 
  391 #ifdef MAC
  392         /*
  393          * Do directory search MAC check using non-cached credentials.
  394          */
  395         if ((error = mac_vnode_check_readdir(td->td_ucred, vp)))
  396                 goto out;
  397 #endif /* MAC */
  398         if ((error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &ncookies,
  399                  &cookies)))
  400                 goto out;
  401 
  402         inp = buf;
  403         outp = (caddr_t)args->dirent;
  404         resid = nbytes;
  405         if ((len = buflen - auio.uio_resid) <= 0)
  406                 goto eof;
  407 
  408         cookiep = cookies;
  409 
  410         if (cookies) {
  411                 /*
  412                  * When using cookies, the vfs has the option of reading from
  413                  * a different offset than that supplied (UFS truncates the
  414                  * offset to a block boundary to make sure that it never reads
  415                  * partway through a directory entry, even if the directory
  416                  * has been compacted).
  417                  */
  418                 while (len > 0 && ncookies > 0 && *cookiep <= off) {
  419                         bdp = (struct dirent *) inp;
  420                         len -= bdp->d_reclen;
  421                         inp += bdp->d_reclen;
  422                         cookiep++;
  423                         ncookies--;
  424                 }
  425         }
  426 
  427         while (len > 0) {
  428                 if (cookiep && ncookies == 0)
  429                         break;
  430                 bdp = (struct dirent *) inp;
  431                 reclen = bdp->d_reclen;
  432                 if (reclen & 3) {
  433                         error = EFAULT;
  434                         goto out;
  435                 }
  436 
  437                 if (bdp->d_fileno == 0) {
  438                         inp += reclen;
  439                         if (cookiep) {
  440                                 off = *cookiep++;
  441                                 ncookies--;
  442                         } else
  443                                 off += reclen;
  444 
  445                         len -= reclen;
  446                         continue;
  447                 }
  448 
  449                 linuxreclen = (is64bit)
  450                     ? LINUX_RECLEN64(bdp->d_namlen)
  451                     : LINUX_RECLEN(bdp->d_namlen);
  452 
  453                 if (reclen > len || resid < linuxreclen) {
  454                         outp++;
  455                         break;
  456                 }
  457 
  458                 if (justone) {
  459                         /* readdir(2) case. */
  460                         linux_dirent = (struct l_dirent*)lbuf;
  461                         linux_dirent->d_ino = bdp->d_fileno;
  462                         linux_dirent->d_off = (l_off_t)linuxreclen;
  463                         linux_dirent->d_reclen = (l_ushort)bdp->d_namlen;
  464                         strlcpy(linux_dirent->d_name, bdp->d_name,
  465                             linuxreclen - offsetof(struct l_dirent, d_name));
  466                         error = copyout(linux_dirent, outp, linuxreclen);
  467                 }
  468                 if (is64bit) {
  469                         linux_dirent64 = (struct l_dirent64*)lbuf;
  470                         linux_dirent64->d_ino = bdp->d_fileno;
  471                         linux_dirent64->d_off = (cookiep)
  472                             ? (l_off_t)*cookiep
  473                             : (l_off_t)(off + reclen);
  474                         linux_dirent64->d_reclen = (l_ushort)linuxreclen;
  475                         linux_dirent64->d_type = bdp->d_type;
  476                         strlcpy(linux_dirent64->d_name, bdp->d_name,
  477                             linuxreclen - offsetof(struct l_dirent64, d_name));
  478                         error = copyout(linux_dirent64, outp, linuxreclen);
  479                 } else if (!justone) {
  480                         linux_dirent = (struct l_dirent*)lbuf;
  481                         linux_dirent->d_ino = bdp->d_fileno;
  482                         linux_dirent->d_off = (cookiep)
  483                             ? (l_off_t)*cookiep
  484                             : (l_off_t)(off + reclen);
  485                         linux_dirent->d_reclen = (l_ushort)linuxreclen;
  486                         /*
  487                          * Copy d_type to last byte of l_dirent buffer
  488                          */
  489                         lbuf[linuxreclen-1] = bdp->d_type;
  490                         strlcpy(linux_dirent->d_name, bdp->d_name,
  491                             linuxreclen - offsetof(struct l_dirent, d_name)-1);
  492                         error = copyout(linux_dirent, outp, linuxreclen);
  493                 }
  494 
  495                 if (error)
  496                         goto out;
  497 
  498                 inp += reclen;
  499                 if (cookiep) {
  500                         off = *cookiep++;
  501                         ncookies--;
  502                 } else
  503                         off += reclen;
  504 
  505                 outp += linuxreclen;
  506                 resid -= linuxreclen;
  507                 len -= reclen;
  508                 if (justone)
  509                         break;
  510         }
  511 
  512         if (outp == (caddr_t)args->dirent) {
  513                 nbytes = resid;
  514                 goto eof;
  515         }
  516 
  517         fp->f_offset = off;
  518         if (justone)
  519                 nbytes = resid + linuxreclen;
  520 
  521 eof:
  522         td->td_retval[0] = nbytes - resid;
  523 
  524 out:
  525         if (cookies)
  526                 free(cookies, M_TEMP);
  527 
  528         VOP_UNLOCK(vp, 0);
  529         VFS_UNLOCK_GIANT(vfslocked);
  530         fdrop(fp, td);
  531         free(buf, M_TEMP);
  532         free(lbuf, M_TEMP);
  533         return (error);
  534 }
  535 
  536 int
  537 linux_getdents(struct thread *td, struct linux_getdents_args *args)
  538 {
  539 
  540 #ifdef DEBUG
  541         if (ldebug(getdents))
  542                 printf(ARGS(getdents, "%d, *, %d"), args->fd, args->count);
  543 #endif
  544 
  545         return (getdents_common(td, (struct linux_getdents64_args*)args, 0));
  546 }
  547 
  548 int
  549 linux_getdents64(struct thread *td, struct linux_getdents64_args *args)
  550 {
  551 
  552 #ifdef DEBUG
  553         if (ldebug(getdents64))
  554                 printf(ARGS(getdents64, "%d, *, %d"), args->fd, args->count);
  555 #endif
  556 
  557         return (getdents_common(td, args, 1));
  558 }
  559 
  560 /*
  561  * These exist mainly for hooks for doing /compat/linux translation.
  562  */
  563 
  564 int
  565 linux_access(struct thread *td, struct linux_access_args *args)
  566 {
  567         char *path;
  568         int error;
  569 
  570         /* linux convention */
  571         if (args->flags & ~(F_OK | X_OK | W_OK | R_OK))
  572                 return (EINVAL);
  573 
  574         LCONVPATHEXIST(td, args->path, &path);
  575 
  576 #ifdef DEBUG
  577         if (ldebug(access))
  578                 printf(ARGS(access, "%s, %d"), path, args->flags);
  579 #endif
  580         error = kern_access(td, path, UIO_SYSSPACE, args->flags);
  581         LFREEPATH(path);
  582 
  583         return (error);
  584 }
  585 
  586 int
  587 linux_faccessat(struct thread *td, struct linux_faccessat_args *args)
  588 {
  589         char *path;
  590         int error, dfd;
  591 
  592         /* linux convention */
  593         if (args->mode & ~(F_OK | X_OK | W_OK | R_OK))
  594                 return (EINVAL);
  595 
  596         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  597         LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
  598 
  599 #ifdef DEBUG
  600         if (ldebug(access))
  601                 printf(ARGS(access, "%s, %d"), path, args->mode);
  602 #endif
  603 
  604         error = kern_accessat(td, dfd, path, UIO_SYSSPACE, 0 /* XXX */,
  605             args->mode);
  606         LFREEPATH(path);
  607 
  608         return (error);
  609 }
  610 
  611 int
  612 linux_unlink(struct thread *td, struct linux_unlink_args *args)
  613 {
  614         char *path;
  615         int error;
  616         struct stat st;
  617 
  618         LCONVPATHEXIST(td, args->path, &path);
  619 
  620 #ifdef DEBUG
  621         if (ldebug(unlink))
  622                 printf(ARGS(unlink, "%s"), path);
  623 #endif
  624 
  625         error = kern_unlink(td, path, UIO_SYSSPACE);
  626         if (error == EPERM)
  627                 /* Introduce POSIX noncompliant behaviour of Linux */
  628                 if (kern_stat(td, path, UIO_SYSSPACE, &st) == 0)
  629                         if (S_ISDIR(st.st_mode))
  630                                 error = EISDIR;
  631         LFREEPATH(path);
  632         return (error);
  633 }
  634 
  635 int
  636 linux_unlinkat(struct thread *td, struct linux_unlinkat_args *args)
  637 {
  638         char *path;
  639         int error, dfd;
  640         struct stat st;
  641 
  642         if (args->flag & ~LINUX_AT_REMOVEDIR)
  643                 return (EINVAL);
  644 
  645         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  646         LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
  647 
  648 #ifdef DEBUG
  649         if (ldebug(unlinkat))
  650                 printf(ARGS(unlinkat, "%s"), path);
  651 #endif
  652 
  653         if (args->flag & LINUX_AT_REMOVEDIR)
  654                 error = kern_rmdirat(td, dfd, path, UIO_SYSSPACE);
  655         else
  656                 error = kern_unlinkat(td, dfd, path, UIO_SYSSPACE);
  657         if (error == EPERM && !(args->flag & LINUX_AT_REMOVEDIR)) {
  658                 /* Introduce POSIX noncompliant behaviour of Linux */
  659                 if (kern_statat(td, AT_SYMLINK_NOFOLLOW, dfd, path,
  660                     UIO_SYSSPACE, &st) == 0 && S_ISDIR(st.st_mode))
  661                         error = EISDIR;
  662         }
  663         LFREEPATH(path);
  664         return (error);
  665 }
  666 int
  667 linux_chdir(struct thread *td, struct linux_chdir_args *args)
  668 {
  669         char *path;
  670         int error;
  671 
  672         LCONVPATHEXIST(td, args->path, &path);
  673 
  674 #ifdef DEBUG
  675         if (ldebug(chdir))
  676                 printf(ARGS(chdir, "%s"), path);
  677 #endif
  678         error = kern_chdir(td, path, UIO_SYSSPACE);
  679         LFREEPATH(path);
  680         return (error);
  681 }
  682 
  683 int
  684 linux_chmod(struct thread *td, struct linux_chmod_args *args)
  685 {
  686         char *path;
  687         int error;
  688 
  689         LCONVPATHEXIST(td, args->path, &path);
  690 
  691 #ifdef DEBUG
  692         if (ldebug(chmod))
  693                 printf(ARGS(chmod, "%s, %d"), path, args->mode);
  694 #endif
  695         error = kern_chmod(td, path, UIO_SYSSPACE, args->mode);
  696         LFREEPATH(path);
  697         return (error);
  698 }
  699 
  700 int
  701 linux_fchmodat(struct thread *td, struct linux_fchmodat_args *args)
  702 {
  703         char *path;
  704         int error, dfd;
  705 
  706         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  707         LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
  708 
  709 #ifdef DEBUG
  710         if (ldebug(fchmodat))
  711                 printf(ARGS(fchmodat, "%s, %d"), path, args->mode);
  712 #endif
  713 
  714         error = kern_fchmodat(td, dfd, path, UIO_SYSSPACE, args->mode, 0);
  715         LFREEPATH(path);
  716         return (error);
  717 }
  718 
  719 int
  720 linux_mkdir(struct thread *td, struct linux_mkdir_args *args)
  721 {
  722         char *path;
  723         int error;
  724 
  725         LCONVPATHCREAT(td, args->path, &path);
  726 
  727 #ifdef DEBUG
  728         if (ldebug(mkdir))
  729                 printf(ARGS(mkdir, "%s, %d"), path, args->mode);
  730 #endif
  731         error = kern_mkdir(td, path, UIO_SYSSPACE, args->mode);
  732         LFREEPATH(path);
  733         return (error);
  734 }
  735 
  736 int
  737 linux_mkdirat(struct thread *td, struct linux_mkdirat_args *args)
  738 {
  739         char *path;
  740         int error, dfd;
  741 
  742         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  743         LCONVPATHCREAT_AT(td, args->pathname, &path, dfd);
  744 
  745 #ifdef DEBUG
  746         if (ldebug(mkdirat))
  747                 printf(ARGS(mkdirat, "%s, %d"), path, args->mode);
  748 #endif
  749         error = kern_mkdirat(td, dfd, path, UIO_SYSSPACE, args->mode);
  750         LFREEPATH(path);
  751         return (error);
  752 }
  753 
  754 int
  755 linux_rmdir(struct thread *td, struct linux_rmdir_args *args)
  756 {
  757         char *path;
  758         int error;
  759 
  760         LCONVPATHEXIST(td, args->path, &path);
  761 
  762 #ifdef DEBUG
  763         if (ldebug(rmdir))
  764                 printf(ARGS(rmdir, "%s"), path);
  765 #endif
  766         error = kern_rmdir(td, path, UIO_SYSSPACE);
  767         LFREEPATH(path);
  768         return (error);
  769 }
  770 
  771 int
  772 linux_rename(struct thread *td, struct linux_rename_args *args)
  773 {
  774         char *from, *to;
  775         int error;
  776 
  777         LCONVPATHEXIST(td, args->from, &from);
  778         /* Expand LCONVPATHCREATE so that `from' can be freed on errors */
  779         error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
  780         if (to == NULL) {
  781                 LFREEPATH(from);
  782                 return (error);
  783         }
  784 
  785 #ifdef DEBUG
  786         if (ldebug(rename))
  787                 printf(ARGS(rename, "%s, %s"), from, to);
  788 #endif
  789         error = kern_rename(td, from, to, UIO_SYSSPACE);
  790         LFREEPATH(from);
  791         LFREEPATH(to);
  792         return (error);
  793 }
  794 
  795 int
  796 linux_renameat(struct thread *td, struct linux_renameat_args *args)
  797 {
  798         char *from, *to;
  799         int error, olddfd, newdfd;
  800 
  801         olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
  802         newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
  803         LCONVPATHEXIST_AT(td, args->oldname, &from, olddfd);
  804         /* Expand LCONVPATHCREATE so that `from' can be freed on errors */
  805         error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, newdfd);
  806         if (to == NULL) {
  807                 LFREEPATH(from);
  808                 return (error);
  809         }
  810 
  811 #ifdef DEBUG
  812         if (ldebug(renameat))
  813                 printf(ARGS(renameat, "%s, %s"), from, to);
  814 #endif
  815         error = kern_renameat(td, olddfd, from, newdfd, to, UIO_SYSSPACE);
  816         LFREEPATH(from);
  817         LFREEPATH(to);
  818         return (error);
  819 }
  820 
  821 int
  822 linux_symlink(struct thread *td, struct linux_symlink_args *args)
  823 {
  824         char *path, *to;
  825         int error;
  826 
  827         LCONVPATHEXIST(td, args->path, &path);
  828         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
  829         error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
  830         if (to == NULL) {
  831                 LFREEPATH(path);
  832                 return (error);
  833         }
  834 
  835 #ifdef DEBUG
  836         if (ldebug(symlink))
  837                 printf(ARGS(symlink, "%s, %s"), path, to);
  838 #endif
  839         error = kern_symlink(td, path, to, UIO_SYSSPACE);
  840         LFREEPATH(path);
  841         LFREEPATH(to);
  842         return (error);
  843 }
  844 
  845 int
  846 linux_symlinkat(struct thread *td, struct linux_symlinkat_args *args)
  847 {
  848         char *path, *to;
  849         int error, dfd;
  850 
  851         dfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
  852         LCONVPATHEXIST_AT(td, args->oldname, &path, dfd);
  853         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
  854         error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, dfd);
  855         if (to == NULL) {
  856                 LFREEPATH(path);
  857                 return (error);
  858         }
  859 
  860 #ifdef DEBUG
  861         if (ldebug(symlinkat))
  862                 printf(ARGS(symlinkat, "%s, %s"), path, to);
  863 #endif
  864 
  865         error = kern_symlinkat(td, path, dfd, to, UIO_SYSSPACE);
  866         LFREEPATH(path);
  867         LFREEPATH(to);
  868         return (error);
  869 }
  870 
  871 int
  872 linux_readlink(struct thread *td, struct linux_readlink_args *args)
  873 {
  874         char *name;
  875         int error;
  876 
  877         LCONVPATHEXIST(td, args->name, &name);
  878 
  879 #ifdef DEBUG
  880         if (ldebug(readlink))
  881                 printf(ARGS(readlink, "%s, %p, %d"), name, (void *)args->buf,
  882                     args->count);
  883 #endif
  884         error = kern_readlink(td, name, UIO_SYSSPACE, args->buf, UIO_USERSPACE,
  885             args->count);
  886         LFREEPATH(name);
  887         return (error);
  888 }
  889 
  890 int
  891 linux_readlinkat(struct thread *td, struct linux_readlinkat_args *args)
  892 {
  893         char *name;
  894         int error, dfd;
  895 
  896         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
  897         LCONVPATHEXIST_AT(td, args->path, &name, dfd);
  898 
  899 #ifdef DEBUG
  900         if (ldebug(readlinkat))
  901                 printf(ARGS(readlinkat, "%s, %p, %d"), name, (void *)args->buf,
  902                     args->bufsiz);
  903 #endif
  904 
  905         error = kern_readlinkat(td, dfd, name, UIO_SYSSPACE, args->buf,
  906             UIO_USERSPACE, args->bufsiz);
  907         LFREEPATH(name);
  908         return (error);
  909 }
  910 
  911 int
  912 linux_truncate(struct thread *td, struct linux_truncate_args *args)
  913 {
  914         char *path;
  915         int error;
  916 
  917         LCONVPATHEXIST(td, args->path, &path);
  918 
  919 #ifdef DEBUG
  920         if (ldebug(truncate))
  921                 printf(ARGS(truncate, "%s, %ld"), path, (long)args->length);
  922 #endif
  923 
  924         error = kern_truncate(td, path, UIO_SYSSPACE, args->length);
  925         LFREEPATH(path);
  926         return (error);
  927 }
  928 
  929 int
  930 linux_truncate64(struct thread *td, struct linux_truncate64_args *args)
  931 {
  932         char *path;
  933         int error;
  934 
  935         LCONVPATHEXIST(td, args->path, &path);
  936 
  937 #ifdef DEBUG
  938         if (ldebug(truncate64))
  939                 printf(ARGS(truncate64, "%s, %jd"), path, args->length);
  940 #endif
  941 
  942         error = kern_truncate(td, path, UIO_SYSSPACE, args->length);
  943         LFREEPATH(path);
  944         return (error);
  945 }
  946 int
  947 linux_ftruncate(struct thread *td, struct linux_ftruncate_args *args)
  948 {
  949         struct ftruncate_args /* {
  950                 int fd;
  951                 int pad;
  952                 off_t length;
  953                 } */ nuap;
  954            
  955         nuap.fd = args->fd;
  956         nuap.length = args->length;
  957         return (ftruncate(td, &nuap));
  958 }
  959 
  960 int
  961 linux_link(struct thread *td, struct linux_link_args *args)
  962 {
  963         char *path, *to;
  964         int error;
  965 
  966         LCONVPATHEXIST(td, args->path, &path);
  967         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
  968         error = linux_emul_convpath(td, args->to, UIO_USERSPACE, &to, 1, AT_FDCWD);
  969         if (to == NULL) {
  970                 LFREEPATH(path);
  971                 return (error);
  972         }
  973 
  974 #ifdef DEBUG
  975         if (ldebug(link))
  976                 printf(ARGS(link, "%s, %s"), path, to);
  977 #endif
  978         error = kern_link(td, path, to, UIO_SYSSPACE);
  979         LFREEPATH(path);
  980         LFREEPATH(to);
  981         return (error);
  982 }
  983 
  984 int
  985 linux_linkat(struct thread *td, struct linux_linkat_args *args)
  986 {
  987         char *path, *to;
  988         int error, olddfd, newdfd;
  989 
  990         /*
  991          * They really introduced flags argument which is forbidden to
  992          * use.
  993          */
  994         if (args->flags != 0)
  995                 return (EINVAL);
  996 
  997         olddfd = (args->olddfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->olddfd;
  998         newdfd = (args->newdfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->newdfd;
  999         LCONVPATHEXIST_AT(td, args->oldname, &path, olddfd);
 1000         /* Expand LCONVPATHCREATE so that `path' can be freed on errors */
 1001         error = linux_emul_convpath(td, args->newname, UIO_USERSPACE, &to, 1, newdfd);
 1002         if (to == NULL) {
 1003                 LFREEPATH(path);
 1004                 return (error);
 1005         }
 1006 
 1007 #ifdef DEBUG
 1008         if (ldebug(linkat))
 1009                 printf(ARGS(linkat, "%i, %s, %i, %s, %i"), args->olddfd, path,
 1010                         args->newdfd, to, args->flags);
 1011 #endif
 1012 
 1013         error = kern_linkat(td, olddfd, newdfd, path, to, UIO_SYSSPACE, FOLLOW);
 1014         LFREEPATH(path);
 1015         LFREEPATH(to);
 1016         return (error);
 1017 }
 1018 
 1019 int
 1020 linux_fdatasync(td, uap)
 1021         struct thread *td;
 1022         struct linux_fdatasync_args *uap;
 1023 {
 1024         struct fsync_args bsd;
 1025 
 1026         bsd.fd = uap->fd;
 1027         return fsync(td, &bsd);
 1028 }
 1029 
 1030 int
 1031 linux_pread(td, uap)
 1032         struct thread *td;
 1033         struct linux_pread_args *uap;
 1034 {
 1035         struct pread_args bsd;
 1036         struct vnode *vp;
 1037         int error;
 1038 
 1039         bsd.fd = uap->fd;
 1040         bsd.buf = uap->buf;
 1041         bsd.nbyte = uap->nbyte;
 1042         bsd.offset = uap->offset;
 1043 
 1044         error = pread(td, &bsd);
 1045 
 1046         if (error == 0) {
 1047                 /* This seems to violate POSIX but linux does it */
 1048                 if ((error = fgetvp(td, uap->fd, &vp)) != 0)
 1049                         return (error);
 1050                 if (vp->v_type == VDIR) {
 1051                         vrele(vp);
 1052                         return (EISDIR);
 1053                 }
 1054                 vrele(vp);
 1055         }
 1056 
 1057         return (error);
 1058 }
 1059 
 1060 int
 1061 linux_pwrite(td, uap)
 1062         struct thread *td;
 1063         struct linux_pwrite_args *uap;
 1064 {
 1065         struct pwrite_args bsd;
 1066 
 1067         bsd.fd = uap->fd;
 1068         bsd.buf = uap->buf;
 1069         bsd.nbyte = uap->nbyte;
 1070         bsd.offset = uap->offset;
 1071         return pwrite(td, &bsd);
 1072 }
 1073 
 1074 int
 1075 linux_mount(struct thread *td, struct linux_mount_args *args)
 1076 {
 1077         struct ufs_args ufs;
 1078         char fstypename[MFSNAMELEN];
 1079         char mntonname[MNAMELEN], mntfromname[MNAMELEN];
 1080         int error;
 1081         int fsflags;
 1082         void *fsdata;
 1083 
 1084         error = copyinstr(args->filesystemtype, fstypename, MFSNAMELEN - 1,
 1085             NULL);
 1086         if (error)
 1087                 return (error);
 1088         error = copyinstr(args->specialfile, mntfromname, MNAMELEN - 1, NULL);
 1089         if (error)
 1090                 return (error);
 1091         error = copyinstr(args->dir, mntonname, MNAMELEN - 1, NULL);
 1092         if (error)
 1093                 return (error);
 1094 
 1095 #ifdef DEBUG
 1096         if (ldebug(mount))
 1097                 printf(ARGS(mount, "%s, %s, %s"),
 1098                     fstypename, mntfromname, mntonname);
 1099 #endif
 1100 
 1101         if (strcmp(fstypename, "ext2") == 0) {
 1102                 strcpy(fstypename, "ext2fs");
 1103                 fsdata = &ufs;
 1104                 ufs.fspec = mntfromname;
 1105 #define DEFAULT_ROOTID          -2
 1106                 ufs.export.ex_root = DEFAULT_ROOTID;
 1107                 ufs.export.ex_flags =
 1108                     args->rwflag & LINUX_MS_RDONLY ? MNT_EXRDONLY : 0;
 1109         } else if (strcmp(fstypename, "proc") == 0) {
 1110                 strcpy(fstypename, "linprocfs");
 1111                 fsdata = NULL;
 1112         } else if (strcmp(fstypename, "vfat") == 0) {
 1113                 strcpy(fstypename, "msdosfs");
 1114                 fsdata = NULL;
 1115         } else {
 1116                 return (ENODEV);
 1117         }
 1118 
 1119         fsflags = 0;
 1120 
 1121         if ((args->rwflag & 0xffff0000) == 0xc0ed0000) {
 1122                 /*
 1123                  * Linux SYNC flag is not included; the closest equivalent
 1124                  * FreeBSD has is !ASYNC, which is our default.
 1125                  */
 1126                 if (args->rwflag & LINUX_MS_RDONLY)
 1127                         fsflags |= MNT_RDONLY;
 1128                 if (args->rwflag & LINUX_MS_NOSUID)
 1129                         fsflags |= MNT_NOSUID;
 1130                 if (args->rwflag & LINUX_MS_NOEXEC)
 1131                         fsflags |= MNT_NOEXEC;
 1132                 if (args->rwflag & LINUX_MS_REMOUNT)
 1133                         fsflags |= MNT_UPDATE;
 1134         }
 1135 
 1136         if (strcmp(fstypename, "linprocfs") == 0) {
 1137                 error = kernel_vmount(fsflags,
 1138                         "fstype", fstypename,
 1139                         "fspath", mntonname,
 1140                         NULL);
 1141         } else if (strcmp(fstypename, "msdosfs") == 0) {
 1142                 error = kernel_vmount(fsflags,
 1143                         "fstype", fstypename,
 1144                         "fspath", mntonname,
 1145                         "from", mntfromname,
 1146                         NULL);
 1147         } else
 1148                 error = EOPNOTSUPP;
 1149         return (error);
 1150 }
 1151 
 1152 int
 1153 linux_oldumount(struct thread *td, struct linux_oldumount_args *args)
 1154 {
 1155         struct linux_umount_args args2;
 1156 
 1157         args2.path = args->path;
 1158         args2.flags = 0;
 1159         return (linux_umount(td, &args2));
 1160 }
 1161 
 1162 int
 1163 linux_umount(struct thread *td, struct linux_umount_args *args)
 1164 {
 1165         struct unmount_args bsd;
 1166 
 1167         bsd.path = args->path;
 1168         bsd.flags = args->flags;        /* XXX correct? */
 1169         return (unmount(td, &bsd));
 1170 }
 1171 
 1172 /*
 1173  * fcntl family of syscalls
 1174  */
 1175 
 1176 struct l_flock {
 1177         l_short         l_type;
 1178         l_short         l_whence;
 1179         l_off_t         l_start;
 1180         l_off_t         l_len;
 1181         l_pid_t         l_pid;
 1182 }
 1183 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 1184 __packed
 1185 #endif
 1186 ;
 1187 
 1188 static void
 1189 linux_to_bsd_flock(struct l_flock *linux_flock, struct flock *bsd_flock)
 1190 {
 1191         switch (linux_flock->l_type) {
 1192         case LINUX_F_RDLCK:
 1193                 bsd_flock->l_type = F_RDLCK;
 1194                 break;
 1195         case LINUX_F_WRLCK:
 1196                 bsd_flock->l_type = F_WRLCK;
 1197                 break;
 1198         case LINUX_F_UNLCK:
 1199                 bsd_flock->l_type = F_UNLCK;
 1200                 break;
 1201         default:
 1202                 bsd_flock->l_type = -1;
 1203                 break;
 1204         }
 1205         bsd_flock->l_whence = linux_flock->l_whence;
 1206         bsd_flock->l_start = (off_t)linux_flock->l_start;
 1207         bsd_flock->l_len = (off_t)linux_flock->l_len;
 1208         bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
 1209         bsd_flock->l_sysid = 0;
 1210 }
 1211 
 1212 static void
 1213 bsd_to_linux_flock(struct flock *bsd_flock, struct l_flock *linux_flock)
 1214 {
 1215         switch (bsd_flock->l_type) {
 1216         case F_RDLCK:
 1217                 linux_flock->l_type = LINUX_F_RDLCK;
 1218                 break;
 1219         case F_WRLCK:
 1220                 linux_flock->l_type = LINUX_F_WRLCK;
 1221                 break;
 1222         case F_UNLCK:
 1223                 linux_flock->l_type = LINUX_F_UNLCK;
 1224                 break;
 1225         }
 1226         linux_flock->l_whence = bsd_flock->l_whence;
 1227         linux_flock->l_start = (l_off_t)bsd_flock->l_start;
 1228         linux_flock->l_len = (l_off_t)bsd_flock->l_len;
 1229         linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
 1230 }
 1231 
 1232 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1233 struct l_flock64 {
 1234         l_short         l_type;
 1235         l_short         l_whence;
 1236         l_loff_t        l_start;
 1237         l_loff_t        l_len;
 1238         l_pid_t         l_pid;
 1239 }
 1240 #if defined(__amd64__) && defined(COMPAT_LINUX32)
 1241 __packed
 1242 #endif
 1243 ;
 1244 
 1245 static void
 1246 linux_to_bsd_flock64(struct l_flock64 *linux_flock, struct flock *bsd_flock)
 1247 {
 1248         switch (linux_flock->l_type) {
 1249         case LINUX_F_RDLCK:
 1250                 bsd_flock->l_type = F_RDLCK;
 1251                 break;
 1252         case LINUX_F_WRLCK:
 1253                 bsd_flock->l_type = F_WRLCK;
 1254                 break;
 1255         case LINUX_F_UNLCK:
 1256                 bsd_flock->l_type = F_UNLCK;
 1257                 break;
 1258         default:
 1259                 bsd_flock->l_type = -1;
 1260                 break;
 1261         }
 1262         bsd_flock->l_whence = linux_flock->l_whence;
 1263         bsd_flock->l_start = (off_t)linux_flock->l_start;
 1264         bsd_flock->l_len = (off_t)linux_flock->l_len;
 1265         bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
 1266         bsd_flock->l_sysid = 0;
 1267 }
 1268 
 1269 static void
 1270 bsd_to_linux_flock64(struct flock *bsd_flock, struct l_flock64 *linux_flock)
 1271 {
 1272         switch (bsd_flock->l_type) {
 1273         case F_RDLCK:
 1274                 linux_flock->l_type = LINUX_F_RDLCK;
 1275                 break;
 1276         case F_WRLCK:
 1277                 linux_flock->l_type = LINUX_F_WRLCK;
 1278                 break;
 1279         case F_UNLCK:
 1280                 linux_flock->l_type = LINUX_F_UNLCK;
 1281                 break;
 1282         }
 1283         linux_flock->l_whence = bsd_flock->l_whence;
 1284         linux_flock->l_start = (l_loff_t)bsd_flock->l_start;
 1285         linux_flock->l_len = (l_loff_t)bsd_flock->l_len;
 1286         linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
 1287 }
 1288 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1289 
 1290 static int
 1291 fcntl_common(struct thread *td, struct linux_fcntl64_args *args)
 1292 {
 1293         struct l_flock linux_flock;
 1294         struct flock bsd_flock;
 1295         struct file *fp;
 1296         long arg;
 1297         int error, result;
 1298 
 1299         switch (args->cmd) {
 1300         case LINUX_F_DUPFD:
 1301                 return (kern_fcntl(td, args->fd, F_DUPFD, args->arg));
 1302 
 1303         case LINUX_F_GETFD:
 1304                 return (kern_fcntl(td, args->fd, F_GETFD, 0));
 1305 
 1306         case LINUX_F_SETFD:
 1307                 return (kern_fcntl(td, args->fd, F_SETFD, args->arg));
 1308 
 1309         case LINUX_F_GETFL:
 1310                 error = kern_fcntl(td, args->fd, F_GETFL, 0);
 1311                 result = td->td_retval[0];
 1312                 td->td_retval[0] = 0;
 1313                 if (result & O_RDONLY)
 1314                         td->td_retval[0] |= LINUX_O_RDONLY;
 1315                 if (result & O_WRONLY)
 1316                         td->td_retval[0] |= LINUX_O_WRONLY;
 1317                 if (result & O_RDWR)
 1318                         td->td_retval[0] |= LINUX_O_RDWR;
 1319                 if (result & O_NDELAY)
 1320                         td->td_retval[0] |= LINUX_O_NONBLOCK;
 1321                 if (result & O_APPEND)
 1322                         td->td_retval[0] |= LINUX_O_APPEND;
 1323                 if (result & O_FSYNC)
 1324                         td->td_retval[0] |= LINUX_O_SYNC;
 1325                 if (result & O_ASYNC)
 1326                         td->td_retval[0] |= LINUX_FASYNC;
 1327 #ifdef LINUX_O_NOFOLLOW
 1328                 if (result & O_NOFOLLOW)
 1329                         td->td_retval[0] |= LINUX_O_NOFOLLOW;
 1330 #endif
 1331 #ifdef LINUX_O_DIRECT
 1332                 if (result & O_DIRECT)
 1333                         td->td_retval[0] |= LINUX_O_DIRECT;
 1334 #endif
 1335                 return (error);
 1336 
 1337         case LINUX_F_SETFL:
 1338                 arg = 0;
 1339                 if (args->arg & LINUX_O_NDELAY)
 1340                         arg |= O_NONBLOCK;
 1341                 if (args->arg & LINUX_O_APPEND)
 1342                         arg |= O_APPEND;
 1343                 if (args->arg & LINUX_O_SYNC)
 1344                         arg |= O_FSYNC;
 1345                 if (args->arg & LINUX_FASYNC)
 1346                         arg |= O_ASYNC;
 1347 #ifdef LINUX_O_NOFOLLOW
 1348                 if (args->arg & LINUX_O_NOFOLLOW)
 1349                         arg |= O_NOFOLLOW;
 1350 #endif
 1351 #ifdef LINUX_O_DIRECT
 1352                 if (args->arg & LINUX_O_DIRECT)
 1353                         arg |= O_DIRECT;
 1354 #endif
 1355                 return (kern_fcntl(td, args->fd, F_SETFL, arg));
 1356 
 1357         case LINUX_F_GETLK:
 1358                 error = copyin((void *)args->arg, &linux_flock,
 1359                     sizeof(linux_flock));
 1360                 if (error)
 1361                         return (error);
 1362                 linux_to_bsd_flock(&linux_flock, &bsd_flock);
 1363                 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
 1364                 if (error)
 1365                         return (error);
 1366                 bsd_to_linux_flock(&bsd_flock, &linux_flock);
 1367                 return (copyout(&linux_flock, (void *)args->arg,
 1368                     sizeof(linux_flock)));
 1369 
 1370         case LINUX_F_SETLK:
 1371                 error = copyin((void *)args->arg, &linux_flock,
 1372                     sizeof(linux_flock));
 1373                 if (error)
 1374                         return (error);
 1375                 linux_to_bsd_flock(&linux_flock, &bsd_flock);
 1376                 return (kern_fcntl(td, args->fd, F_SETLK,
 1377                     (intptr_t)&bsd_flock));
 1378 
 1379         case LINUX_F_SETLKW:
 1380                 error = copyin((void *)args->arg, &linux_flock,
 1381                     sizeof(linux_flock));
 1382                 if (error)
 1383                         return (error);
 1384                 linux_to_bsd_flock(&linux_flock, &bsd_flock);
 1385                 return (kern_fcntl(td, args->fd, F_SETLKW,
 1386                      (intptr_t)&bsd_flock));
 1387 
 1388         case LINUX_F_GETOWN:
 1389                 return (kern_fcntl(td, args->fd, F_GETOWN, 0));
 1390 
 1391         case LINUX_F_SETOWN:
 1392                 /*
 1393                  * XXX some Linux applications depend on F_SETOWN having no
 1394                  * significant effect for pipes (SIGIO is not delivered for
 1395                  * pipes under Linux-2.2.35 at least).
 1396                  */
 1397                 error = fget(td, args->fd, &fp);
 1398                 if (error)
 1399                         return (error);
 1400                 if (fp->f_type == DTYPE_PIPE) {
 1401                         fdrop(fp, td);
 1402                         return (EINVAL);
 1403                 }
 1404                 fdrop(fp, td);
 1405 
 1406                 return (kern_fcntl(td, args->fd, F_SETOWN, args->arg));
 1407         }
 1408 
 1409         return (EINVAL);
 1410 }
 1411 
 1412 int
 1413 linux_fcntl(struct thread *td, struct linux_fcntl_args *args)
 1414 {
 1415         struct linux_fcntl64_args args64;
 1416 
 1417 #ifdef DEBUG
 1418         if (ldebug(fcntl))
 1419                 printf(ARGS(fcntl, "%d, %08x, *"), args->fd, args->cmd);
 1420 #endif
 1421 
 1422         args64.fd = args->fd;
 1423         args64.cmd = args->cmd;
 1424         args64.arg = args->arg;
 1425         return (fcntl_common(td, &args64));
 1426 }
 1427 
 1428 #if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
 1429 int
 1430 linux_fcntl64(struct thread *td, struct linux_fcntl64_args *args)
 1431 {
 1432         struct l_flock64 linux_flock;
 1433         struct flock bsd_flock;
 1434         int error;
 1435 
 1436 #ifdef DEBUG
 1437         if (ldebug(fcntl64))
 1438                 printf(ARGS(fcntl64, "%d, %08x, *"), args->fd, args->cmd);
 1439 #endif
 1440 
 1441         switch (args->cmd) {
 1442         case LINUX_F_GETLK64:
 1443                 error = copyin((void *)args->arg, &linux_flock,
 1444                     sizeof(linux_flock));
 1445                 if (error)
 1446                         return (error);
 1447                 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
 1448                 error = kern_fcntl(td, args->fd, F_GETLK, (intptr_t)&bsd_flock);
 1449                 if (error)
 1450                         return (error);
 1451                 bsd_to_linux_flock64(&bsd_flock, &linux_flock);
 1452                 return (copyout(&linux_flock, (void *)args->arg,
 1453                             sizeof(linux_flock)));
 1454 
 1455         case LINUX_F_SETLK64:
 1456                 error = copyin((void *)args->arg, &linux_flock,
 1457                     sizeof(linux_flock));
 1458                 if (error)
 1459                         return (error);
 1460                 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
 1461                 return (kern_fcntl(td, args->fd, F_SETLK,
 1462                     (intptr_t)&bsd_flock));
 1463 
 1464         case LINUX_F_SETLKW64:
 1465                 error = copyin((void *)args->arg, &linux_flock,
 1466                     sizeof(linux_flock));
 1467                 if (error)
 1468                         return (error);
 1469                 linux_to_bsd_flock64(&linux_flock, &bsd_flock);
 1470                 return (kern_fcntl(td, args->fd, F_SETLKW,
 1471                     (intptr_t)&bsd_flock));
 1472         }
 1473 
 1474         return (fcntl_common(td, args));
 1475 }
 1476 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
 1477 
 1478 int
 1479 linux_chown(struct thread *td, struct linux_chown_args *args)
 1480 {
 1481         char *path;
 1482         int error;
 1483 
 1484         LCONVPATHEXIST(td, args->path, &path);
 1485 
 1486 #ifdef DEBUG
 1487         if (ldebug(chown))
 1488                 printf(ARGS(chown, "%s, %d, %d"), path, args->uid, args->gid);
 1489 #endif
 1490         error = kern_chown(td, path, UIO_SYSSPACE, args->uid, args->gid);
 1491         LFREEPATH(path);
 1492         return (error);
 1493 }
 1494 
 1495 int
 1496 linux_fchownat(struct thread *td, struct linux_fchownat_args *args)
 1497 {
 1498         char *path;
 1499         int error, dfd, follow;
 1500 
 1501         if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
 1502                 return (EINVAL);
 1503 
 1504         dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD :  args->dfd;
 1505         LCONVPATHEXIST_AT(td, args->filename, &path, dfd);
 1506 
 1507 #ifdef DEBUG
 1508         if (ldebug(fchownat))
 1509                 printf(ARGS(fchownat, "%s, %d, %d"), path, args->uid, args->gid);
 1510 #endif
 1511 
 1512         follow = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) == 0 ? 0 :
 1513             AT_SYMLINK_NOFOLLOW;
 1514         error = kern_fchownat(td, dfd, path, UIO_SYSSPACE, args->uid, args->gid,
 1515             follow);
 1516         LFREEPATH(path);
 1517         return (error);
 1518 }
 1519 
 1520 int
 1521 linux_lchown(struct thread *td, struct linux_lchown_args *args)
 1522 {
 1523         char *path;
 1524         int error;
 1525 
 1526         LCONVPATHEXIST(td, args->path, &path);
 1527 
 1528 #ifdef DEBUG
 1529         if (ldebug(lchown))
 1530                 printf(ARGS(lchown, "%s, %d, %d"), path, args->uid, args->gid);
 1531 #endif
 1532         error = kern_lchown(td, path, UIO_SYSSPACE, args->uid, args->gid);
 1533         LFREEPATH(path);
 1534         return (error);
 1535 }
 1536 
 1537 static int
 1538 convert_fadvice(int advice)
 1539 {
 1540         switch (advice) {
 1541         case LINUX_POSIX_FADV_NORMAL:
 1542                 return (POSIX_FADV_NORMAL);
 1543         case LINUX_POSIX_FADV_RANDOM:
 1544                 return (POSIX_FADV_RANDOM);
 1545         case LINUX_POSIX_FADV_SEQUENTIAL:
 1546                 return (POSIX_FADV_SEQUENTIAL);
 1547         case LINUX_POSIX_FADV_WILLNEED:
 1548                 return (POSIX_FADV_WILLNEED);
 1549         case LINUX_POSIX_FADV_DONTNEED:
 1550                 return (POSIX_FADV_DONTNEED);
 1551         case LINUX_POSIX_FADV_NOREUSE:
 1552                 return (POSIX_FADV_NOREUSE);
 1553         default:
 1554                 return (-1);
 1555         }
 1556 }
 1557 
 1558 int
 1559 linux_fadvise64(struct thread *td, struct linux_fadvise64_args *args)
 1560 {
 1561         int advice;
 1562 
 1563         advice = convert_fadvice(args->advice);
 1564         if (advice == -1)
 1565                 return (EINVAL);
 1566         return (kern_posix_fadvise(td, args->fd, args->offset, args->len,
 1567             advice));
 1568 }
 1569 
 1570 int
 1571 linux_fadvise64_64(struct thread *td, struct linux_fadvise64_64_args *args)
 1572 {
 1573         int advice;
 1574 
 1575         advice = convert_fadvice(args->advice);
 1576         if (advice == -1)
 1577                 return (EINVAL);
 1578         return (kern_posix_fadvise(td, args->fd, args->offset, args->len,
 1579             advice));
 1580 }

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