Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
NetBSD/sys/miscfs/fdesc/fdesc_vnops.c

943 lines
20 KiB
C
Raw Blame History

/* $NetBSD: fdesc_vnops.c,v 1.139 2022/01/15 19:33:58 riastradh Exp $ */
/*
* Copyright (c) 1992, 1993
* 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.
*
* @(#)fdesc_vnops.c 8.17 (Berkeley) 5/22/95
*
* #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp #
*/
/*
* /dev/fd Filesystem
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fdesc_vnops.c,v 1.139 2022/01/15 19:33:58 riastradh Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/socketvar.h>
#include <sys/filedesc.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/buf.h>
#include <sys/dirent.h>
#include <sys/tty.h>
#include <sys/kauth.h>
#include <sys/atomic.h>
#include <miscfs/fdesc/fdesc.h>
#include <miscfs/genfs/genfs.h>
#define cttyvp(p) ((p)->p_lflag & PL_CONTROLT ? (p)->p_session->s_ttyvp : NULL)
dev_t devctty;
#if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
#endif
int fdesc_lookup(void *);
int fdesc_open(void *);
int fdesc_getattr(void *);
int fdesc_setattr(void *);
int fdesc_read(void *);
int fdesc_write(void *);
int fdesc_ioctl(void *);
int fdesc_poll(void *);
int fdesc_kqfilter(void *);
int fdesc_link(void *);
int fdesc_symlink(void *);
int fdesc_readdir(void *);
int fdesc_readlink(void *);
int fdesc_inactive(void *);
int fdesc_reclaim(void *);
int fdesc_print(void *);
int fdesc_pathconf(void *);
static int fdesc_attr(int, struct vattr *, kauth_cred_t);
int (**fdesc_vnodeop_p)(void *);
const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_parsepath_desc, genfs_parsepath }, /* parsepath */
{ &vop_lookup_desc, fdesc_lookup }, /* lookup */
{ &vop_create_desc, genfs_eopnotsupp }, /* create */
{ &vop_mknod_desc, genfs_eopnotsupp }, /* mknod */
{ &vop_open_desc, fdesc_open }, /* open */
{ &vop_close_desc, genfs_nullop }, /* close */
{ &vop_access_desc, genfs_nullop }, /* access */
{ &vop_accessx_desc, genfs_accessx }, /* accessx */
{ &vop_getattr_desc, fdesc_getattr }, /* getattr */
{ &vop_setattr_desc, fdesc_setattr }, /* setattr */
{ &vop_read_desc, fdesc_read }, /* read */
{ &vop_write_desc, fdesc_write }, /* write */
{ &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */
{ &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */
{ &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */
{ &vop_fcntl_desc, genfs_fcntl }, /* fcntl */
{ &vop_poll_desc, fdesc_poll }, /* poll */
{ &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, genfs_revoke }, /* revoke */
{ &vop_mmap_desc, genfs_eopnotsupp }, /* mmap */
{ &vop_fsync_desc, genfs_nullop }, /* fsync */
{ &vop_seek_desc, genfs_seek }, /* seek */
{ &vop_remove_desc, genfs_eopnotsupp }, /* remove */
{ &vop_link_desc, fdesc_link }, /* link */
{ &vop_rename_desc, genfs_eopnotsupp }, /* rename */
{ &vop_mkdir_desc, genfs_eopnotsupp }, /* mkdir */
{ &vop_rmdir_desc, genfs_eopnotsupp }, /* rmdir */
{ &vop_symlink_desc, fdesc_symlink }, /* symlink */
{ &vop_readdir_desc, fdesc_readdir }, /* readdir */
{ &vop_readlink_desc, fdesc_readlink }, /* readlink */
{ &vop_abortop_desc, genfs_abortop }, /* abortop */
{ &vop_inactive_desc, fdesc_inactive }, /* inactive */
{ &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */
{ &vop_lock_desc, genfs_lock }, /* lock */
{ &vop_unlock_desc, genfs_unlock }, /* unlock */
{ &vop_bmap_desc, genfs_eopnotsupp }, /* bmap */
{ &vop_strategy_desc, genfs_badop }, /* strategy */
{ &vop_print_desc, fdesc_print }, /* print */
{ &vop_islocked_desc, genfs_islocked }, /* islocked */
{ &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */
{ &vop_advlock_desc, genfs_einval }, /* advlock */
{ &vop_bwrite_desc, genfs_eopnotsupp }, /* bwrite */
{ &vop_putpages_desc, genfs_null_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc fdesc_vnodeop_opv_desc =
{ &fdesc_vnodeop_p, fdesc_vnodeop_entries };
/*
* Initialise cache headers
*/
void
fdesc_init(void)
{
int cttymajor;
/* locate the major number */
cttymajor = devsw_name2chr("ctty", NULL, 0);
devctty = makedev(cttymajor, 0);
}
void
fdesc_done(void)
{
}
/*
* vp is the current namei directory
* ndp is the name to locate in that directory...
*/
int
fdesc_lookup(void *v)
{
struct vop_lookup_v2_args /* {
struct vnode * a_dvp;
struct vnode ** a_vpp;
struct componentname * a_cnp;
} */ *ap = v;
struct vnode **vpp = ap->a_vpp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct lwp *l = curlwp;
const char *pname = cnp->cn_nameptr;
struct proc *p = l->l_proc;
unsigned fd = 0;
int error, ix = -1;
fdtab_t *dt;
dt = atomic_load_consume(&curlwp->l_fd->fd_dt);
if (cnp->cn_namelen == 1 && *pname == '.') {
*vpp = dvp;
vref(dvp);
return (0);
}
switch (VTOFDESC(dvp)->fd_type) {
default:
case Flink:
case Fdesc:
case Fctty:
error = ENOTDIR;
goto bad;
case Froot:
if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) {
ix = FD_DEVFD;
goto good;
}
if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) {
struct vnode *ttyvp = cttyvp(p);
if (ttyvp == NULL) {
error = ENXIO;
goto bad;
}
ix = FD_CTTY;
goto good;
}
switch (cnp->cn_namelen) {
case 5:
if (memcmp(pname, "stdin", 5) == 0) {
ix = FD_STDIN;
goto good;
}
break;
case 6:
if (memcmp(pname, "stdout", 6) == 0) {
ix = FD_STDOUT;
goto good;
} else if (memcmp(pname, "stderr", 6) == 0) {
ix = FD_STDERR;
goto good;
}
break;
}
error = ENOENT;
goto bad;
case Fdevfd:
if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) {
ix = FD_ROOT;
goto good;
}
fd = 0;
while (*pname >= '0' && *pname <= '9') {
fd = 10 * fd + *pname++ - '0';
if (fd >= dt->dt_nfiles)
break;
}
if (*pname != '\0') {
error = ENOENT;
goto bad;
}
if (fd >= dt->dt_nfiles || dt->dt_ff[fd] == NULL ||
dt->dt_ff[fd]->ff_file == NULL) {
error = EBADF;
goto bad;
}
ix = FD_DESC + fd;
goto good;
}
bad:
*vpp = NULL;
return error;
good:
KASSERT(ix != -1);
error = vcache_get(dvp->v_mount, &ix, sizeof(ix), vpp);
if (error)
return error;
/*
* Prevent returning VNON nodes.
* Operation fdesc_inactive() will reset the type to VNON.
*/
if (ix == FD_CTTY)
(*vpp)->v_type = VCHR;
else if (ix >= FD_DESC)
(*vpp)->v_type = VREG;
KASSERT((*vpp)->v_type != VNON);
return 0;
}
int
fdesc_open(void *v)
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
switch (VTOFDESC(vp)->fd_type) {
case Fdesc:
/*
* XXX Kludge: set dupfd to contain the value of the
* the file descriptor being sought for duplication.
* The error return ensures that the vnode for this
* device will be released by vn_open. vn_open will
* then detect this special error and take the actions
* in fd_dupopen. Other callers of vn_open or VOP_OPEN
* not prepared to deal with this situation will
* report a real error.
*/
curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */
return EDUPFD;
case Fctty:
return cdev_open(devctty, ap->a_mode, 0, curlwp);
case Froot:
case Fdevfd:
case Flink:
break;
}
return (0);
}
static int
fdesc_attr(int fd, struct vattr *vap, kauth_cred_t cred)
{
file_t *fp;
struct stat stb;
int error;
if ((fp = fd_getfile(fd)) == NULL)
return (EBADF);
switch (fp->f_type) {
case DTYPE_VNODE:
vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(fp->f_vnode, vap, cred);
VOP_UNLOCK(fp->f_vnode);
if (error == 0 && vap->va_type == VDIR) {
/*
* directories can cause loops in the namespace,
* so turn off the 'x' bits to avoid trouble.
*/
vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
}
break;
default:
memset(&stb, 0, sizeof(stb));
error = (*fp->f_ops->fo_stat)(fp, &stb);
if (error)
break;
vattr_null(vap);
switch(fp->f_type) {
case DTYPE_SOCKET:
vap->va_type = VSOCK;
break;
case DTYPE_PIPE:
vap->va_type = VFIFO;
break;
default:
/* use VNON perhaps? */
vap->va_type = VBAD;
break;
}
vap->va_mode = stb.st_mode;
vap->va_nlink = stb.st_nlink;
vap->va_uid = stb.st_uid;
vap->va_gid = stb.st_gid;
vap->va_fsid = stb.st_dev;
vap->va_fileid = stb.st_ino;
vap->va_size = stb.st_size;
vap->va_blocksize = stb.st_blksize;
vap->va_atime = stb.st_atimespec;
vap->va_mtime = stb.st_mtimespec;
vap->va_ctime = stb.st_ctimespec;
vap->va_gen = stb.st_gen;
vap->va_flags = stb.st_flags;
vap->va_rdev = stb.st_rdev;
vap->va_bytes = stb.st_blocks * stb.st_blksize;
break;
}
fd_putfile(fd);
return (error);
}
int
fdesc_getattr(void *v)
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
struct lwp *a_l;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
unsigned fd;
int error = 0;
struct timeval tv;
switch (VTOFDESC(vp)->fd_type) {
case Froot:
case Fdevfd:
case Flink:
case Fctty:
vattr_null(vap);
vap->va_fileid = VTOFDESC(vp)->fd_ix;
#define R_ALL (S_IRUSR|S_IRGRP|S_IROTH)
#define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH)
#define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH)
switch (VTOFDESC(vp)->fd_type) {
case Flink:
vap->va_mode = R_ALL|X_ALL;
vap->va_type = VLNK;
vap->va_rdev = 0;
vap->va_nlink = 1;
vap->va_size = strlen(VTOFDESC(vp)->fd_link);
break;
case Fctty:
vap->va_mode = R_ALL|W_ALL;
vap->va_type = VCHR;
vap->va_rdev = devctty;
vap->va_nlink = 1;
vap->va_size = 0;
break;
default:
vap->va_mode = R_ALL|X_ALL;
vap->va_type = VDIR;
vap->va_rdev = 0;
vap->va_nlink = 2;
vap->va_size = DEV_BSIZE;
break;
}
vap->va_uid = 0;
vap->va_gid = 0;
vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0];
vap->va_blocksize = DEV_BSIZE;
getmicroboottime(&tv);
vap->va_atime.tv_sec = tv.tv_sec;
vap->va_atime.tv_nsec = 0;
vap->va_mtime = vap->va_atime;
vap->va_ctime = vap->va_mtime;
vap->va_gen = 0;
vap->va_flags = 0;
vap->va_bytes = 0;
break;
case Fdesc:
fd = VTOFDESC(vp)->fd_fd;
error = fdesc_attr(fd, vap, ap->a_cred);
break;
default:
panic("fdesc_getattr");
break;
}
if (error == 0)
vp->v_type = vap->va_type;
return (error);
}
int
fdesc_setattr(void *v)
{
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
kauth_cred_t a_cred;
} */ *ap = v;
file_t *fp;
unsigned fd;
/*
* Can't mess with the root vnode
*/
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fdesc:
break;
case Fctty:
return (0);
default:
return (EACCES);
}
fd = VTOFDESC(ap->a_vp)->fd_fd;
if ((fp = fd_getfile(fd)) == NULL)
return (EBADF);
/*
* XXX: Can't reasonably set the attr's on any types currently.
* On vnode's this will cause truncation and socket/pipes make
* no sense.
*/
fd_putfile(fd);
return (0);
}
struct fdesc_target {
ino_t ft_fileno;
u_char ft_type;
u_char ft_namlen;
const char *ft_name;
} fdesc_targets[] = {
#define N(s) sizeof(s)-1, s
{ FD_DEVFD, DT_DIR, N("fd") },
{ FD_STDIN, DT_LNK, N("stdin") },
{ FD_STDOUT, DT_LNK, N("stdout") },
{ FD_STDERR, DT_LNK, N("stderr") },
{ FD_CTTY, DT_UNKNOWN, N("tty") },
#undef N
#define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1)
};
static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]);
int
fdesc_readdir(void *v)
{
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
int *a_eofflag;
off_t **a_cookies;
int *a_ncookies;
} */ *ap = v;
struct uio *uio = ap->a_uio;
struct dirent d;
off_t i;
int j;
int error;
off_t *cookies = NULL;
int ncookies;
fdtab_t *dt;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
return 0;
case Fdesc:
return ENOTDIR;
default:
break;
}
dt = atomic_load_consume(&curlwp->l_fd->fd_dt);
if (uio->uio_resid < UIO_MX)
return EINVAL;
if (uio->uio_offset < 0)
return EINVAL;
error = 0;
i = uio->uio_offset;
(void)memset(&d, 0, UIO_MX);
d.d_reclen = UIO_MX;
if (ap->a_ncookies)
ncookies = uio->uio_resid / UIO_MX;
else
ncookies = 0;
if (VTOFDESC(ap->a_vp)->fd_type == Froot) {
struct fdesc_target *ft;
if (i >= nfdesc_targets)
return 0;
if (ap->a_ncookies) {
ncookies = uimin(ncookies, (nfdesc_targets - i));
cookies = malloc(ncookies * sizeof(off_t),
M_TEMP, M_WAITOK);
*ap->a_cookies = cookies;
*ap->a_ncookies = ncookies;
}
for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX &&
i < nfdesc_targets; ft++, i++) {
switch (ft->ft_fileno) {
case FD_CTTY:
if (cttyvp(curproc) == NULL)
continue;
break;
case FD_STDIN:
case FD_STDOUT:
case FD_STDERR:
if ((ft->ft_fileno - FD_STDIN) >=
dt->dt_nfiles)
continue;
if (dt->dt_ff[ft->ft_fileno - FD_STDIN]
== NULL || dt->dt_ff[ft->ft_fileno -
FD_STDIN]->ff_file == NULL)
continue;
break;
}
d.d_fileno = ft->ft_fileno;
d.d_namlen = ft->ft_namlen;
(void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1);
d.d_type = ft->ft_type;
if ((error = uiomove(&d, UIO_MX, uio)) != 0)
break;
if (cookies)
*cookies++ = i + 1;
}
} else {
if (ap->a_ncookies) {
ncookies = uimin(ncookies, dt->dt_nfiles + 2);
cookies = malloc(ncookies * sizeof(off_t),
M_TEMP, M_WAITOK);
*ap->a_cookies = cookies;
*ap->a_ncookies = ncookies;
}
for (; i - 2 < dt->dt_nfiles && uio->uio_resid >= UIO_MX; i++) {
switch (i) {
case 0:
case 1:
d.d_fileno = FD_ROOT; /* XXX */
d.d_namlen = i + 1;
(void)memcpy(d.d_name, "..", d.d_namlen);
d.d_name[i + 1] = '\0';
d.d_type = DT_DIR;
break;
default:
j = (int)i - 2;
if (dt->dt_ff[j] == NULL ||
dt->dt_ff[j]->ff_file == NULL)
continue;
d.d_fileno = j + FD_STDIN;
d.d_namlen = snprintf(d.d_name,
sizeof(d.d_name), "%d", j);
d.d_type = DT_UNKNOWN;
break;
}
if ((error = uiomove(&d, UIO_MX, uio)) != 0)
break;
if (cookies)
*cookies++ = i + 1;
}
}
if (ap->a_ncookies && error) {
free(*ap->a_cookies, M_TEMP);
*ap->a_ncookies = 0;
*ap->a_cookies = NULL;
}
uio->uio_offset = i;
return error;
}
int
fdesc_readlink(void *v)
{
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
kauth_cred_t a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
int error;
if (vp->v_type != VLNK)
return (EPERM);
if (VTOFDESC(vp)->fd_type == Flink) {
const char *ln = VTOFDESC(vp)->fd_link;
error = uiomove(__UNCONST(ln), strlen(ln), ap->a_uio);
} else {
error = EOPNOTSUPP;
}
return (error);
}
int
fdesc_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
int error = EOPNOTSUPP;
struct vnode *vp = ap->a_vp;
switch (VTOFDESC(vp)->fd_type) {
case Fctty:
VOP_UNLOCK(vp);
error = cdev_read(devctty, ap->a_uio, ap->a_ioflag);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
int
fdesc_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
kauth_cred_t a_cred;
} */ *ap = v;
int error = EOPNOTSUPP;
struct vnode *vp = ap->a_vp;
switch (VTOFDESC(vp)->fd_type) {
case Fctty:
VOP_UNLOCK(vp);
error = cdev_write(devctty, ap->a_uio, ap->a_ioflag);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
int
fdesc_ioctl(void *v)
{
struct vop_ioctl_args /* {
struct vnode *a_vp;
u_long a_command;
void *a_data;
int a_fflag;
kauth_cred_t a_cred;
} */ *ap = v;
int error = EOPNOTSUPP;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
error = cdev_ioctl(devctty, ap->a_command, ap->a_data,
ap->a_fflag, curlwp);
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
int
fdesc_poll(void *v)
{
struct vop_poll_args /* {
struct vnode *a_vp;
int a_events;
} */ *ap = v;
int revents;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
revents = cdev_poll(devctty, ap->a_events, curlwp);
break;
default:
revents = genfs_poll(v);
break;
}
return (revents);
}
int
fdesc_kqfilter(void *v)
{
struct vop_kqfilter_args /* {
struct vnode *a_vp;
struct knote *a_kn;
} */ *ap = v;
int error, fd;
file_t *fp;
switch (VTOFDESC(ap->a_vp)->fd_type) {
case Fctty:
error = cdev_kqfilter(devctty, ap->a_kn);
break;
case Fdesc:
/* just invoke kqfilter for the underlying descriptor */
fd = VTOFDESC(ap->a_vp)->fd_fd;
if ((fp = fd_getfile(fd)) == NULL)
return (1);
error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn);
fd_putfile(fd);
break;
default:
return (genfs_kqfilter(v));
}
return (error);
}
int
fdesc_inactive(void *v)
{
struct vop_inactive_v2_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct fdescnode *fd = VTOFDESC(vp);
/*
* Clear out the v_type field to avoid
* nasty things happening on reclaim.
*/
if (fd->fd_type == Fctty || fd->fd_type == Fdesc)
vp->v_type = VNON;
return (0);
}
int
fdesc_reclaim(void *v)
{
struct vop_reclaim_v2_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct fdescnode *fd = VTOFDESC(vp);
VOP_UNLOCK(vp);
vp->v_data = NULL;
kmem_free(fd, sizeof(struct fdescnode));
return (0);
}
/*
* Return POSIX pathconf information applicable to special devices.
*/
int
fdesc_pathconf(void *v)
{
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
register_t *a_retval;
} */ *ap = v;
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_MAX_CANON:
*ap->a_retval = MAX_CANON;
return (0);
case _PC_MAX_INPUT:
*ap->a_retval = MAX_INPUT;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_VDISABLE:
*ap->a_retval = _POSIX_VDISABLE;
return (0);
case _PC_SYNC_IO:
*ap->a_retval = 1;
return (0);
default:
return genfs_pathconf(ap);
}
/* NOTREACHED */
}
/*
* Print out the contents of a /dev/fd vnode.
*/
/* ARGSUSED */
int
fdesc_print(void *v)
{
printf("tag VT_NON, fdesc vnode\n");
return (0);
}
int
fdesc_link(void *v)
{
struct vop_link_v2_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
return (EROFS);
}
int
fdesc_symlink(void *v)
{
struct vop_symlink_v3_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap = v;
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
return (EROFS);
}
Reference in New Issue View Git Blame Copy Permalink