FreeBSD/Linux Kernel Cross Reference
sys/fs/ptyfs/ptyfs_vfsops.c

     /*      $NetBSD: ptyfs_vfsops.c,v 1.5 2005/02/26 22:58:55 perry Exp $   */
     
     /*
      * Copyright (c) 1992, 1993, 1995
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software donated to Berkeley by
      * Jan-Simon Pendry.
      *
     * 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     */
    
    /*
     * Pseudo-tty Filesystem
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: ptyfs_vfsops.c,v 1.5 2005/02/26 22:58:55 perry Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/sysctl.h>
    #include <sys/conf.h>
    #include <sys/proc.h>
    #include <sys/vnode.h>
    #include <sys/mount.h>
    #include <sys/namei.h>
    #include <sys/stat.h>
    #include <sys/dirent.h>
    #include <sys/malloc.h>
    #include <sys/syslog.h>
    #include <sys/select.h>
    #include <sys/tty.h>
    #include <sys/pty.h>
    
    #include <fs/ptyfs/ptyfs.h>
    #include <miscfs/specfs/specdev.h>
    
    MALLOC_DEFINE(M_PTYFSMNT, "ptyfs mount", "ptyfs mount structures");
    
    void    ptyfs_init(void);
    void    ptyfs_reinit(void);
    void    ptyfs_done(void);
    int     ptyfs_mount(struct mount *, const char *, void *, struct nameidata *,
        struct proc *);
    int     ptyfs_start(struct mount *, int, struct proc *);
    int     ptyfs_unmount(struct mount *, int, struct proc *);
    int     ptyfs_statvfs(struct mount *, struct statvfs *, struct proc *);
    int     ptyfs_quotactl(struct mount *, int, uid_t, void *, struct proc *);
    int     ptyfs_sync(struct mount *, int, struct ucred *, struct proc *);
    int     ptyfs_vget(struct mount *, ino_t, struct vnode **);
    int     ptyfs_fhtovp(struct mount *, struct fid *, struct vnode **);
    int     ptyfs_checkexp(struct mount *, struct mbuf *, int *, struct ucred **);
    int     ptyfs_vptofh(struct vnode *, struct fid *);
    
    static int ptyfs__allocvp(struct ptm_pty *, struct proc *, struct vnode **,
        dev_t, char);
    static int ptyfs__makename(struct ptm_pty *, char *, size_t, dev_t, char);
    static void ptyfs__getvattr(struct ptm_pty *, struct proc *, struct vattr *);
    
    /*
     * ptm glue: When we mount, we make ptm point to us.
     */
    struct ptm_pty *ptyfs_save_ptm;
    
    struct ptm_pty ptm_ptyfspty = {
            ptyfs__allocvp,
            ptyfs__makename,
            ptyfs__getvattr,
            NULL
    };
    
    static int
    ptyfs__makename(struct ptm_pty *pt, char *buf, size_t bufsiz, dev_t dev,
        char ms)
    {
           struct mount *mp = pt->arg;
           size_t len;
   
           switch (ms) {
           case 'p':
                   /* We don't provide access to the master, should we? */
                   len = snprintf(buf, bufsiz, "/dev/null");
                   break;
           case 't':
                   len = snprintf(buf, bufsiz, "%s/%d", mp->mnt_stat.f_mntonname,
                       minor(dev));
                   break;
           default:
                   return EINVAL;
           }
   
           return len >= bufsiz ? ENOSPC : 0;
   }
   
   
   static int
   /*ARGSUSED*/
   ptyfs__allocvp(struct ptm_pty *pt, struct proc *p, struct vnode **vpp,
       dev_t dev, char ms)
   {
           struct mount *mp = pt->arg;
           ptyfstype type;
   
           switch (ms) {
           case 'p':
                   type = PTYFSptc;
                   break;
           case 't':
                   type = PTYFSpts;
                   break;
           default:
                   return EINVAL;
           }
   
           return ptyfs_allocvp(mp, vpp, type, minor(dev), p);
   }
   
   
   static void
   ptyfs__getvattr(struct ptm_pty *pt, struct proc *p, struct vattr *vattr)
   {
           struct mount *mp = pt->arg;
           struct ptyfsmount *pmnt = VFSTOPTY(mp);
           VATTR_NULL(vattr);
           /* get real uid */
           vattr->va_uid = p->p_cred->p_ruid;
           vattr->va_gid = pmnt->pmnt_gid;
           vattr->va_mode = pmnt->pmnt_mode;
   }
   
   
   void
   ptyfs_init(void)
   {
   #ifdef _LKM
           malloc_type_attach(M_PTYFSMNT);
   #endif
           ptyfs_hashinit();
   }
   
   void
   ptyfs_reinit(void)
   {
           ptyfs_hashreinit();
   }
   
   void
   ptyfs_done(void)
   {
   #ifdef _LKM
           malloc_type_detach(M_PTYFSMNT);
   #endif
           ptyfs_hashdone();
   }
   
   /*
    * Mount the Pseudo tty params filesystem
    */
   int
   ptyfs_mount(struct mount *mp, const char *path, void *data,
       struct nameidata *ndp, struct proc *p)
   {
           int error = 0;
           struct ptyfsmount *pmnt;
           struct ptyfs_args args;
   
           if (UIO_MX & (UIO_MX - 1)) {
                   log(LOG_ERR, "ptyfs: invalid directory entry size");
                   return EINVAL;
           }
   
           if (mp->mnt_flag & MNT_GETARGS) {
                   pmnt = VFSTOPTY(mp);
                   if (pmnt == NULL)
                           return EIO;
                   args.version = PTYFS_ARGSVERSION;
                   args.mode = pmnt->pmnt_mode;
                   args.gid = pmnt->pmnt_gid;
                   return copyout(&args, data, sizeof(args));
           }
   
           if (mp->mnt_flag & MNT_UPDATE)
                   return EOPNOTSUPP;
   
           if (data != NULL) {
                   error = copyin(data, &args, sizeof args);
                   if (error != 0)
                           return error;
   
                   if (args.version != PTYFS_ARGSVERSION)
                           return EINVAL;
           } else {
                   /* Compat code; remove and return an error */
                   args.gid = 4;   /* XXX tty gid */
                   args.mode = S_IRUSR|S_IWUSR|S_IWGRP;
           }
   
           pmnt = malloc(sizeof(struct ptyfsmount), M_UFSMNT, M_WAITOK);
   
           mp->mnt_data = pmnt;
           pmnt->pmnt_gid = args.gid;
           pmnt->pmnt_mode = args.mode;
           mp->mnt_flag |= MNT_LOCAL;
           vfs_getnewfsid(mp);
   
           if ((error = set_statvfs_info(path, UIO_USERSPACE, "ptyfs",
               UIO_SYSSPACE, mp, p)) != 0) {
                   return error;
           }
   
           /* Point pty access to us */
           if (ptyfs_save_ptm != NULL)
                   return EBUSY;
   
           ptm_ptyfspty.arg = mp;
           ptyfs_save_ptm = pty_sethandler(&ptm_ptyfspty);
           return 0;
   }
   
   /*ARGSUSED*/
   int
   ptyfs_start(struct mount *mp, int flags, struct proc *p)
   {
           return 0;
   }
   
   /*ARGSUSED*/
   int
   ptyfs_unmount(struct mount *mp, int mntflags, struct proc *p)
   {
           int error;
           int flags = 0;
   
           if (mntflags & MNT_FORCE)
                   flags |= FORCECLOSE;
   
           if ((error = vflush(mp, 0, flags)) != 0)
                   return (error);
   
           /* Restore where pty access was pointing */
           ptm_ptyfspty.arg = NULL;
           (void)pty_sethandler(ptyfs_save_ptm);
           ptyfs_save_ptm = NULL;
   
           /*
            * Finally, throw away the ptyfsmount structure
            */
           free(mp->mnt_data, M_UFSMNT);
           mp->mnt_data = 0;
   
           return 0;
   }
   
   int
   ptyfs_root(struct mount *mp, struct vnode **vpp)
   {
           /* setup "." */
           return ptyfs_allocvp(mp, vpp, PTYFSroot, 0, NULL);
   }
   
   /*ARGSUSED*/
   int
   ptyfs_quotactl(struct mount *mp, int cmd, uid_t uid, void *arg, struct proc *p)
   {
           return EOPNOTSUPP;
   }
   
   /*ARGSUSED*/
   int
   ptyfs_statvfs(struct mount *mp, struct statvfs *sbp, struct proc *p)
   {
           sbp->f_bsize = DEV_BSIZE;
           sbp->f_frsize = DEV_BSIZE;
           sbp->f_iosize = DEV_BSIZE;
           sbp->f_blocks = 2;              /* 1K to keep df happy */
           sbp->f_bfree = 0;
           sbp->f_bavail = 0;
           sbp->f_bresvd = 0;
           sbp->f_files = 1024;    /* XXX lie */
           sbp->f_ffree = 128;     /* XXX lie */
           sbp->f_favail = 128;    /* XXX lie */
           sbp->f_fresvd = 0;
           sbp->f_namemax = MAXNAMLEN;
           copy_statvfs_info(sbp, mp);
           return 0;
   }
   
   /*ARGSUSED*/
   int
   ptyfs_sync(struct mount *mp, int waitfor, struct ucred *uc, struct proc *p)
   {
           return 0;
   }
   
   /*
    * Kernfs flat namespace lookup.
    * Currently unsupported.
    */
   /*ARGSUSED*/
   int
   ptyfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
   {
           return EOPNOTSUPP;
   }
   
   /*ARGSUSED*/
   int
   ptyfs_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
   {
           return EOPNOTSUPP;
   }
   
   /*ARGSUSED*/
   int
   ptyfs_checkexp(struct mount *mp, struct mbuf *mb, int *wh, struct ucred **anon)
   {
           return EOPNOTSUPP;
   }
   
   SYSCTL_SETUP(sysctl_vfs_ptyfs_setup, "sysctl vfs.ptyfs subtree setup")
   {
   
           sysctl_createv(clog, 0, NULL, NULL,
                          CTLFLAG_PERMANENT,
                          CTLTYPE_NODE, "vfs", NULL,
                          NULL, 0, NULL, 0,
                          CTL_VFS, CTL_EOL);
           sysctl_createv(clog, 0, NULL, NULL,
                          CTLFLAG_PERMANENT,
                          CTLTYPE_NODE, "ptyfs",
                          SYSCTL_DESCR("Pty file system"),
                          NULL, 0, NULL, 0,
                          CTL_VFS, 23, CTL_EOL);
           /*
            * XXX the "23" above could be dynamic, thereby eliminating
            * one more instance of the "number to vfs" mapping problem,
            * but "23" is the order as taken from sys/mount.h
            */
   }
   
   
   /*ARGSUSED*/
   int
   ptyfs_vptofh(struct vnode *vp, struct fid *fhp)
   {
           return EOPNOTSUPP;
   }
   
   extern const struct vnodeopv_desc ptyfs_vnodeop_opv_desc;
   
   const struct vnodeopv_desc * const ptyfs_vnodeopv_descs[] = {
           &ptyfs_vnodeop_opv_desc,
           NULL,
   };
   
   struct vfsops ptyfs_vfsops = {
           MOUNT_PTYFS,
           ptyfs_mount,
           ptyfs_start,
           ptyfs_unmount,
           ptyfs_root,
           ptyfs_quotactl,
           ptyfs_statvfs,
           ptyfs_sync,
           ptyfs_vget,
           ptyfs_fhtovp,
           ptyfs_vptofh,
           ptyfs_init,
           ptyfs_reinit,
           ptyfs_done,
           NULL,
           NULL,                           /* vfs_mountroot */
           ptyfs_checkexp,
           (int (*)(struct mount *, struct vnode *, struct timespec *))eopnotsupp,
           (int (*)(struct mount *, int, struct vnode *, int, const char *,
               struct proc *))eopnotsupp,
           ptyfs_vnodeopv_descs,
   };

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