ptyfs_vfsops.c

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    1 /*      $NetBSD: ptyfs_vfsops.c,v 1.21.2.1 2007/02/17 23:27:44 tron Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1992, 1993, 1995
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software donated to Berkeley by
    8  * Jan-Simon Pendry.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  */
   35 
   36 /*
   37  * Pseudo-tty Filesystem
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __KERNEL_RCSID(0, "$NetBSD: ptyfs_vfsops.c,v 1.21.2.1 2007/02/17 23:27:44 tron Exp $");
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/sysctl.h>
   46 #include <sys/conf.h>
   47 #include <sys/proc.h>
   48 #include <sys/vnode.h>
   49 #include <sys/mount.h>
   50 #include <sys/namei.h>
   51 #include <sys/stat.h>
   52 #include <sys/dirent.h>
   53 #include <sys/malloc.h>
   54 #include <sys/syslog.h>
   55 #include <sys/select.h>
   56 #include <sys/filedesc.h>
   57 #include <sys/tty.h>
   58 #include <sys/pty.h>
   59 #include <sys/kauth.h>
   60 
   61 #include <fs/ptyfs/ptyfs.h>
   62 #include <miscfs/specfs/specdev.h>
   63 
   64 MALLOC_DEFINE(M_PTYFSMNT, "ptyfs mount", "ptyfs mount structures");
   65 
   66 void    ptyfs_init(void);
   67 void    ptyfs_reinit(void);
   68 void    ptyfs_done(void);
   69 int     ptyfs_mount(struct mount *, const char *, void *, struct nameidata *,
   70     struct lwp *);
   71 int     ptyfs_start(struct mount *, int, struct lwp *);
   72 int     ptyfs_unmount(struct mount *, int, struct lwp *);
   73 int     ptyfs_statvfs(struct mount *, struct statvfs *, struct lwp *);
   74 int     ptyfs_quotactl(struct mount *, int, uid_t, void *, struct lwp *);
   75 int     ptyfs_sync(struct mount *, int, kauth_cred_t, struct lwp *);
   76 int     ptyfs_vget(struct mount *, ino_t, struct vnode **);
   77 
   78 static int ptyfs__allocvp(struct ptm_pty *, struct lwp *, struct vnode **,
   79     dev_t, char);
   80 static int ptyfs__makename(struct ptm_pty *, struct lwp *, char *, size_t,
   81     dev_t, char);
   82 static void ptyfs__getvattr(struct ptm_pty *, struct lwp *, struct vattr *);
   83 
   84 /*
   85  * ptm glue: When we mount, we make ptm point to us.
   86  */
   87 struct ptm_pty *ptyfs_save_ptm;
   88 static int ptyfs_count;
   89 
   90 struct ptm_pty ptm_ptyfspty = {
   91         ptyfs__allocvp,
   92         ptyfs__makename,
   93         ptyfs__getvattr,
   94         NULL
   95 };
   96 
   97 static const char *
   98 ptyfs__getpath(struct lwp *l, const struct mount *mp)
   99 {
  100 #define MAXBUF (sizeof(mp->mnt_stat.f_mntonname) + 32)
  101         struct cwdinfo *cwdi = l->l_proc->p_cwdi;
  102         char *buf;
  103         const char *rv;
  104         size_t len;
  105         char *bp;
  106         int error;
  107 
  108         rv = mp->mnt_stat.f_mntonname;
  109         if (cwdi->cwdi_rdir == NULL)
  110                 return rv;
  111 
  112         buf = malloc(MAXBUF, M_TEMP, M_WAITOK);
  113         bp = buf + MAXBUF;
  114         *--bp = '\0';
  115         error = getcwd_common(cwdi->cwdi_rdir, rootvnode, &bp,
  116             buf, MAXBUF / 2, 0, l);
  117         if (error)      /* XXX */
  118                 goto out;
  119 
  120         len = strlen(bp);
  121         if (len < sizeof(mp->mnt_stat.f_mntonname))     /* XXX */
  122                 rv += len;
  123 out:
  124         free(buf, M_TEMP);
  125         return rv;
  126 }
  127 
  128 static int
  129 ptyfs__makename(struct ptm_pty *pt, struct lwp *l, char *tbuf, size_t bufsiz,
  130     dev_t dev, char ms)
  131 {
  132         struct mount *mp = pt->arg;
  133         size_t len;
  134 
  135         switch (ms) {
  136         case 'p':
  137                 /* We don't provide access to the master, should we? */
  138                 len = snprintf(tbuf, bufsiz, "/dev/null");
  139                 break;
  140         case 't':
  141                 len = snprintf(tbuf, bufsiz, "%s/%d", ptyfs__getpath(l, mp),
  142                     minor(dev));
  143                 break;
  144         default:
  145                 return EINVAL;
  146         }
  147 
  148         return len >= bufsiz ? ENOSPC : 0;
  149 }
  150 
  151 
  152 static int
  153 /*ARGSUSED*/
  154 ptyfs__allocvp(struct ptm_pty *pt, struct lwp *l, struct vnode **vpp,
  155     dev_t dev, char ms)
  156 {
  157         struct mount *mp = pt->arg;
  158         ptyfstype type;
  159 
  160         switch (ms) {
  161         case 'p':
  162                 type = PTYFSptc;
  163                 break;
  164         case 't':
  165                 type = PTYFSpts;
  166                 break;
  167         default:
  168                 return EINVAL;
  169         }
  170 
  171         return ptyfs_allocvp(mp, vpp, type, minor(dev), l);
  172 }
  173 
  174 
  175 static void
  176 ptyfs__getvattr(struct ptm_pty *pt, struct lwp *l, struct vattr *vattr)
  177 {
  178         struct mount *mp = pt->arg;
  179         struct ptyfsmount *pmnt = VFSTOPTY(mp);
  180         VATTR_NULL(vattr);
  181         /* get real uid */
  182         vattr->va_uid = kauth_cred_getuid(l->l_cred);
  183         vattr->va_gid = pmnt->pmnt_gid;
  184         vattr->va_mode = pmnt->pmnt_mode;
  185 }
  186 
  187 
  188 void
  189 ptyfs_init(void)
  190 {
  191 #ifdef _LKM
  192         malloc_type_attach(M_PTYFSMNT);
  193 #endif
  194         ptyfs_hashinit();
  195 }
  196 
  197 void
  198 ptyfs_reinit(void)
  199 {
  200         ptyfs_hashreinit();
  201 }
  202 
  203 void
  204 ptyfs_done(void)
  205 {
  206 #ifdef _LKM
  207         malloc_type_detach(M_PTYFSMNT);
  208 #endif
  209         ptyfs_hashdone();
  210 }
  211 
  212 /*
  213  * Mount the Pseudo tty params filesystem
  214  */
  215 int
  216 ptyfs_mount(struct mount *mp, const char *path, void *data,
  217     struct nameidata *ndp, struct lwp *l)
  218 {
  219         int error = 0;
  220         struct ptyfsmount *pmnt;
  221         struct ptyfs_args args;
  222 
  223         if (UIO_MX & (UIO_MX - 1)) {
  224                 log(LOG_ERR, "ptyfs: invalid directory entry size");
  225                 return EINVAL;
  226         }
  227 
  228         if (mp->mnt_flag & MNT_GETARGS) {
  229                 pmnt = VFSTOPTY(mp);
  230                 if (pmnt == NULL)
  231                         return EIO;
  232                 args.version = PTYFS_ARGSVERSION;
  233                 args.mode = pmnt->pmnt_mode;
  234                 args.gid = pmnt->pmnt_gid;
  235                 return copyout(&args, data, sizeof(args));
  236         }
  237 
  238         /* Don't allow more than one mount */
  239         if (ptyfs_count)
  240                 return EBUSY;
  241 
  242         if (mp->mnt_flag & MNT_UPDATE)
  243                 return EOPNOTSUPP;
  244 
  245         if (data != NULL) {
  246                 error = copyin(data, &args, sizeof args);
  247                 if (error != 0)
  248                         return error;
  249 
  250                 if (args.version != PTYFS_ARGSVERSION)
  251                         return EINVAL;
  252         } else {
  253                 /*
  254                  * Arguments are mandatory.
  255                  */
  256                 return EINVAL;
  257         }
  258 
  259         pmnt = malloc(sizeof(struct ptyfsmount), M_UFSMNT, M_WAITOK);
  260 
  261         mp->mnt_data = pmnt;
  262         pmnt->pmnt_gid = args.gid;
  263         pmnt->pmnt_mode = args.mode;
  264         mp->mnt_flag |= MNT_LOCAL;
  265         vfs_getnewfsid(mp);
  266 
  267         if ((error = set_statvfs_info(path, UIO_USERSPACE, "ptyfs",
  268             UIO_SYSSPACE, mp, l)) != 0) {
  269                 free(pmnt, M_UFSMNT);
  270                 return error;
  271         }
  272 
  273         /* Point pty access to us */
  274 
  275         ptm_ptyfspty.arg = mp;
  276         ptyfs_save_ptm = pty_sethandler(&ptm_ptyfspty);
  277         ptyfs_count++;
  278         return 0;
  279 }
  280 
  281 /*ARGSUSED*/
  282 int
  283 ptyfs_start(struct mount *mp, int flags,
  284     struct lwp *p)
  285 {
  286         return 0;
  287 }
  288 
  289 /*ARGSUSED*/
  290 int
  291 ptyfs_unmount(struct mount *mp, int mntflags, struct lwp *p)
  292 {
  293         int error;
  294         int flags = 0;
  295 
  296         if (mntflags & MNT_FORCE)
  297                 flags |= FORCECLOSE;
  298 
  299         if ((error = vflush(mp, 0, flags)) != 0)
  300                 return (error);
  301 
  302         /* Restore where pty access was pointing */
  303         (void)pty_sethandler(ptyfs_save_ptm);
  304         ptyfs_save_ptm = NULL;
  305         ptm_ptyfspty.arg = NULL;
  306 
  307         /*
  308          * Finally, throw away the ptyfsmount structure
  309          */
  310         free(mp->mnt_data, M_UFSMNT);
  311         mp->mnt_data = 0;
  312         ptyfs_count--;
  313 
  314         return 0;
  315 }
  316 
  317 int
  318 ptyfs_root(struct mount *mp, struct vnode **vpp)
  319 {
  320         /* setup "." */
  321         return ptyfs_allocvp(mp, vpp, PTYFSroot, 0, NULL);
  322 }
  323 
  324 /*ARGSUSED*/
  325 int
  326 ptyfs_quotactl(struct mount *mp, int cmd, uid_t uid,
  327     void *arg, struct lwp *p)
  328 {
  329         return EOPNOTSUPP;
  330 }
  331 
  332 /*ARGSUSED*/
  333 int
  334 ptyfs_statvfs(struct mount *mp, struct statvfs *sbp, struct lwp *p)
  335 {
  336         sbp->f_bsize = DEV_BSIZE;
  337         sbp->f_frsize = DEV_BSIZE;
  338         sbp->f_iosize = DEV_BSIZE;
  339         sbp->f_blocks = 2;              /* 1K to keep df happy */
  340         sbp->f_bfree = 0;
  341         sbp->f_bavail = 0;
  342         sbp->f_bresvd = 0;
  343         sbp->f_files = 1024;    /* XXX lie */
  344         sbp->f_ffree = 128;     /* XXX lie */
  345         sbp->f_favail = 128;    /* XXX lie */
  346         sbp->f_fresvd = 0;
  347         sbp->f_namemax = MAXNAMLEN;
  348         copy_statvfs_info(sbp, mp);
  349         return 0;
  350 }
  351 
  352 /*ARGSUSED*/
  353 int
  354 ptyfs_sync(struct mount *mp, int waitfor,
  355     kauth_cred_t uc, struct lwp *p)
  356 {
  357         return 0;
  358 }
  359 
  360 /*
  361  * Kernfs flat namespace lookup.
  362  * Currently unsupported.
  363  */
  364 /*ARGSUSED*/
  365 int
  366 ptyfs_vget(struct mount *mp, ino_t ino,
  367     struct vnode **vpp)
  368 {
  369         return EOPNOTSUPP;
  370 }
  371 
  372 SYSCTL_SETUP(sysctl_vfs_ptyfs_setup, "sysctl vfs.ptyfs subtree setup")
  373 {
  374 
  375         sysctl_createv(clog, 0, NULL, NULL,
  376                        CTLFLAG_PERMANENT,
  377                        CTLTYPE_NODE, "vfs", NULL,
  378                        NULL, 0, NULL, 0,
  379                        CTL_VFS, CTL_EOL);
  380         sysctl_createv(clog, 0, NULL, NULL,
  381                        CTLFLAG_PERMANENT,
  382                        CTLTYPE_NODE, "ptyfs",
  383                        SYSCTL_DESCR("Pty file system"),
  384                        NULL, 0, NULL, 0,
  385                        CTL_VFS, 23, CTL_EOL);
  386         /*
  387          * XXX the "23" above could be dynamic, thereby eliminating
  388          * one more instance of the "number to vfs" mapping problem,
  389          * but "23" is the order as taken from sys/mount.h
  390          */
  391 }
  392 
  393 
  394 extern const struct vnodeopv_desc ptyfs_vnodeop_opv_desc;
  395 
  396 const struct vnodeopv_desc * const ptyfs_vnodeopv_descs[] = {
  397         &ptyfs_vnodeop_opv_desc,
  398         NULL,
  399 };
  400 
  401 struct vfsops ptyfs_vfsops = {
  402         MOUNT_PTYFS,
  403         ptyfs_mount,
  404         ptyfs_start,
  405         ptyfs_unmount,
  406         ptyfs_root,
  407         ptyfs_quotactl,
  408         ptyfs_statvfs,
  409         ptyfs_sync,
  410         ptyfs_vget,
  411         (void *)eopnotsupp,             /* vfs_fhtovp */
  412         (void *)eopnotsupp,             /* vfs_vptofp */
  413         ptyfs_init,
  414         ptyfs_reinit,
  415         ptyfs_done,
  416         NULL,                           /* vfs_mountroot */
  417         (int (*)(struct mount *, struct vnode *, struct timespec *))eopnotsupp,
  418         (int (*)(struct mount *, int, struct vnode *, int, const char *,
  419             struct lwp *))eopnotsupp,
  420         ptyfs_vnodeopv_descs,
  421         0,
  422         { NULL, NULL },
  423 };
  424 VFS_ATTACH(ptyfs_vfsops);
Cache object: 87da5b8abc4a0e324b31c30ae814e8f0
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sys/fs/ptyfs/ptyfs_vfsops.c
