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Separate chroot() into kern_chroot().  Rename change_dir() to checkvp_chdir()
and reorganize the code to avoid doing weird things to the passed vnode's
lock and ref count in deep subroutines (which lead to buggy code).

Fix a bug in chdir()/kern_chdir() (the namei data was not being freed in all
cases), and also fix a bug in symlink() (missing zfree in error case).

Submitted-by: Paul Herman <pherman@frenchfries.net>
Additional-work-by: dillon

    1: /*
    2:  * KERN_SYSCALL.H	- Split syscall prototypes
    3:  *
    4:  * Copyright (c) 2003 David P. Reese, Jr. <daver@gomerbud.com>
    5:  * All rights reserved.
    6:  *
    7:  * Redistribution and use in source and binary forms, with or without
    8:  * modification, are permitted provided that the following conditions
    9:  * are met:
   10:  * 1. Redistributions of source code must retain the above copyright
   11:  *    notice, this list of conditions and the following disclaimer.
   12:  * 2. Redistributions in binary form must reproduce the above copyright
   13:  *    notice, this list of conditions and the following disclaimer in the
   14:  *    documentation and/or other materials provided with the distribution.
   15:  *
   16:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   17:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   20:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26:  * SUCH DAMAGE.
   27:  *
   28:  * $DragonFly: src/sys/sys/kern_syscall.h,v 1.15 2004/03/16 17:53:51 dillon Exp $
   29:  */
   30: 
   31: #ifndef _SYS_KERN_SYSCALL_H_
   32: #define _SYS_KERN_SYSCALL_H_
   33: 
   34: enum dup_type {DUP_FIXED, DUP_VARIABLE};
   35: union fcntl_dat;
   36: struct image_args;
   37: struct mbuf;
   38: struct msghdr;
   39: struct nameidata;
   40: struct rlimit;
   41: struct rusage;
   42: struct sigaction;
   43: struct sigaltstack;
   44: struct __sigset;
   45: struct sf_hdtr;
   46: struct sockaddr;
   47: struct socket;
   48: struct sockopt;
   49: struct stat;
   50: struct statfs;
   51: struct timeval;
   52: struct uio;
   53: struct vnode;
   54: 
   55: /*
   56:  * Prototypes for syscalls in kern/kern_descrip.c
   57:  */
   58: int kern_dup(enum dup_type type, int old, int new, int *res);
   59: int kern_fcntl(int fd, int cmd, union fcntl_dat *dat);
   60: int kern_fstat(int fd, struct stat *st);
   61: 
   62: /*
   63:  * Prototypes for syscalls in kern/kern_exec.c
   64:  */
   65: int kern_execve(struct nameidata *nd, struct image_args *args);
   66: 
   67: /*
   68:  * Prototypes for syscalls in kern/kern_exit.c
   69:  */
   70: int kern_wait(pid_t pid, int *status, int options, struct rusage *rusage,
   71: 	int *res);
   72: 
   73: /*
   74:  * Prototypes for syscalls in kern/kern_sig.c
   75:  */
   76: int kern_sigaction(int sig, struct sigaction *act, struct sigaction *oact);
   77: int kern_sigprocmask(int how, struct __sigset *set, struct __sigset *oset);
   78: int kern_sigpending(struct __sigset *set);
   79: int kern_sigsuspend(struct __sigset *mask);
   80: int kern_sigaltstack(struct sigaltstack *ss, struct sigaltstack *oss);
   81: int kern_kill(int sig, int id);
   82: 
   83: /*
   84:  * Prototypes for syscalls in kern/sys_generic.c
   85:  */
   86: int kern_readv(int fd, struct uio *auio, int flags, int *res);
   87: int kern_writev(int fd, struct uio *auio, int flags, int *res);
   88: 
   89: /*
   90:  * Prototypes for syscalls in kern/kern_resource.c
   91:  */
   92: int kern_setrlimit(u_int which, struct rlimit *limp);
   93: int kern_getrlimit(u_int which, struct rlimit *limp);
   94: 
   95: /*
   96:  * Prototypes for syscalls in kern/uipc_syscalls.c
   97:  */
   98: int kern_accept(int s, struct sockaddr **name, int *namelen, int *res);
   99: int kern_bind(int s, struct sockaddr *sa);
  100: int kern_connect(int s, struct sockaddr *sa);
  101: int kern_listen(int s, int backlog);
  102: int kern_getpeername(int s, struct sockaddr **name, int *namelen);
  103: int kern_getsockopt(int s, struct sockopt *sopt);
  104: int kern_getsockname(int s, struct sockaddr **name, int *namelen);
  105: int kern_recvmsg(int s, struct sockaddr **sa, struct uio *auio,
  106: 	struct mbuf **control, int *flags, int *res);
  107: int kern_shutdown(int s, int how);
  108: int kern_sendfile(struct vnode *vp, int s, off_t offset, size_t nbytes,
  109: 	off_t *sbytes, int flags);
  110: int kern_sendmsg(int s, struct sockaddr *sa, struct uio *auio,
  111: 	struct mbuf *control, int flags, int *res);
  112: int kern_setsockopt(int s, struct sockopt *sopt);
  113: int kern_socket(int domain, int type, int protocol, int *res);
  114: int kern_socketpair(int domain, int type, int protocol, int *sockv);
  115: 
  116: /*
  117:  * Prototypes for syscalls in kern/vfs_syscalls.c
  118:  */
  119: int kern_access(struct nameidata *nd, int aflags);
  120: int kern_chdir(struct nameidata *nd);
  121: int kern_chmod(struct nameidata *nd, int mode);
  122: int kern_chown(struct nameidata *nd, int uid, int gid);
  123: int kern_chroot(struct vnode *vp);
  124: int kern_fstatfs(int fd, struct statfs *buf);
  125: int kern_ftruncate(int fd, off_t length);
  126: int kern_futimes(int fd, struct timeval *tptr);
  127: int kern_getdirentries(int fd, char *buf, u_int count, long *basep, int *res);
  128: int kern_link(struct nameidata *nd, struct nameidata *linknd);
  129: int kern_lseek(int fd, off_t offset, int whence, off_t *res);
  130: int kern_mkdir(struct nameidata *nd, int mode);
  131: int kern_mkfifo(struct nameidata *nd, int mode);
  132: int kern_mknod(struct nameidata *nd, int mode, int dev);
  133: int kern_open(struct nameidata *nd, int flags, int mode, int *res);
  134: int kern_readlink(struct nameidata *nd, char *buf, int count, int *res);
  135: int kern_rename(struct nameidata *fromnd, struct nameidata *tond);
  136: int kern_rmdir(struct nameidata *nd);
  137: int kern_stat(struct nameidata *nd, struct stat *st);
  138: int kern_statfs(struct nameidata *nd, struct statfs *buf);
  139: int kern_symlink(char *path, struct nameidata *nd);
  140: int kern_truncate(struct nameidata *nd, off_t length);
  141: int kern_unlink(struct nameidata *nd);
  142: int kern_utimes(struct nameidata *nd, struct timeval *tptr);
  143: 
  144: /*
  145:  * Prototypes for syscalls in vm/vm_mmap.c
  146:  */
  147: int kern_mmap(caddr_t addr, size_t len, int prot, int flags, int fd,
  148: 	off_t pos, void **res);
  149: 
  150: #endif /* !_SYS_KERN_SYSCALL_H_ */