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7c9f4b5736
NetBSD/sys/fs/ptyfs/ptyfs_vnops.c
christos 7c9f4b5736 I don't think that the vgone() in vop_inactive is needed; in fact it might 
be the source of my deadlocks.
2004-12-18 05:26:41 +00:00

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/* $NetBSD: ptyfs_vnops.c,v 1.6 2004/12/18 05:26:41 christos Exp $ */
/*
* Copyright (c) 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed 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.
*
* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
*/
/*
* Copyright (c) 1993 Jan-Simon Pendry
*
* This code is derived from software contributed 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
*/
/*
* ptyfs vnode interface
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.6 2004/12/18 05:26:41 christos Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/select.h>
#include <sys/dirent.h>
#include <sys/resourcevar.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/tty.h>
#include <sys/pty.h>
#include <uvm/uvm_extern.h> /* for PAGE_SIZE */
#include <machine/reg.h>
#include <fs/ptyfs/ptyfs.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
/*
* Vnode Operations.
*
*/
int ptyfs_lookup (void *);
#define ptyfs_create genfs_eopnotsupp
#define ptyfs_mknod genfs_eopnotsupp
int ptyfs_open (void *);
int ptyfs_close (void *);
int ptyfs_access (void *);
int ptyfs_getattr (void *);
int ptyfs_setattr (void *);
int ptyfs_read (void *);
int ptyfs_write (void *);
#define ptyfs_fcntl genfs_fcntl
int ptyfs_ioctl (void *);
int ptyfs_poll (void *);
int ptyfs_kqfilter (void *);
#define ptyfs_revoke genfs_revoke
#define ptyfs_mmap genfs_eopnotsupp
#define ptyfs_fsync genfs_nullop
#define ptyfs_seek genfs_nullop
#define ptyfs_remove genfs_eopnotsupp
#define ptyfs_link genfs_abortop
#define ptyfs_rename genfs_eopnotsupp
#define ptyfs_mkdir genfs_eopnotsupp
#define ptyfs_rmdir genfs_eopnotsupp
#define ptyfs_symlink genfs_abortop
int ptyfs_readdir (void *);
#define ptyfs_readlink genfs_eopnotsupp
#define ptyfs_abortop genfs_abortop
int ptyfs_reclaim (void *);
#define ptyfs_lock genfs_lock
#define ptyfs_unlock genfs_unlock
#define ptyfs_bmap genfs_badop
#define ptyfs_strategy genfs_badop
int ptyfs_print (void *);
int ptyfs_pathconf (void *);
#define ptyfs_islocked genfs_islocked
#define ptyfs_advlock genfs_einval
#define ptyfs_blkatoff genfs_eopnotsupp
#define ptyfs_valloc genfs_eopnotsupp
#define ptyfs_vfree genfs_nullop
#define ptyfs_truncate genfs_eopnotsupp
int ptyfs_update (void *);
#define ptyfs_bwrite genfs_eopnotsupp
#define ptyfs_putpages genfs_null_putpages
static int ptyfs_chown(struct vnode *, uid_t, gid_t, struct ucred *,
struct proc *);
static int ptyfs_chmod(struct vnode *, mode_t, struct ucred *, struct proc *);
static void ptyfs_time(struct ptyfsnode *, struct timespec *,
struct timespec *);
static int atoi(const char *, size_t);
extern const struct cdevsw pts_cdevsw, ptc_cdevsw;
/*
* ptyfs vnode operations.
*/
int (**ptyfs_vnodeop_p)(void *);
const struct vnodeopv_entry_desc ptyfs_vnodeop_entries[] = {
{ &vop_default_desc, vn_default_error },
{ &vop_lookup_desc, ptyfs_lookup }, /* lookup */
{ &vop_create_desc, ptyfs_create }, /* create */
{ &vop_mknod_desc, ptyfs_mknod }, /* mknod */
{ &vop_open_desc, ptyfs_open }, /* open */
{ &vop_close_desc, ptyfs_close }, /* close */
{ &vop_access_desc, ptyfs_access }, /* access */
{ &vop_getattr_desc, ptyfs_getattr }, /* getattr */
{ &vop_setattr_desc, ptyfs_setattr }, /* setattr */
{ &vop_read_desc, ptyfs_read }, /* read */
{ &vop_write_desc, ptyfs_write }, /* write */
{ &vop_ioctl_desc, ptyfs_ioctl }, /* ioctl */
{ &vop_fcntl_desc, ptyfs_fcntl }, /* fcntl */
{ &vop_poll_desc, ptyfs_poll }, /* poll */
{ &vop_kqfilter_desc, ptyfs_kqfilter }, /* kqfilter */
{ &vop_revoke_desc, ptyfs_revoke }, /* revoke */
{ &vop_mmap_desc, ptyfs_mmap }, /* mmap */
{ &vop_fsync_desc, ptyfs_fsync }, /* fsync */
{ &vop_seek_desc, ptyfs_seek }, /* seek */
{ &vop_remove_desc, ptyfs_remove }, /* remove */
{ &vop_link_desc, ptyfs_link }, /* link */
{ &vop_rename_desc, ptyfs_rename }, /* rename */
{ &vop_mkdir_desc, ptyfs_mkdir }, /* mkdir */
{ &vop_rmdir_desc, ptyfs_rmdir }, /* rmdir */
{ &vop_symlink_desc, ptyfs_symlink }, /* symlink */
{ &vop_readdir_desc, ptyfs_readdir }, /* readdir */
{ &vop_readlink_desc, ptyfs_readlink }, /* readlink */
{ &vop_abortop_desc, ptyfs_abortop }, /* abortop */
{ &vop_inactive_desc, spec_inactive }, /* inactive */
{ &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */
{ &vop_lock_desc, ptyfs_lock }, /* lock */
{ &vop_unlock_desc, ptyfs_unlock }, /* unlock */
{ &vop_bmap_desc, ptyfs_bmap }, /* bmap */
{ &vop_strategy_desc, ptyfs_strategy }, /* strategy */
{ &vop_print_desc, ptyfs_print }, /* print */
{ &vop_islocked_desc, ptyfs_islocked }, /* islocked */
{ &vop_pathconf_desc, ptyfs_pathconf }, /* pathconf */
{ &vop_advlock_desc, ptyfs_advlock }, /* advlock */
{ &vop_blkatoff_desc, ptyfs_blkatoff }, /* blkatoff */
{ &vop_valloc_desc, ptyfs_valloc }, /* valloc */
{ &vop_vfree_desc, ptyfs_vfree }, /* vfree */
{ &vop_truncate_desc, ptyfs_truncate }, /* truncate */
{ &vop_update_desc, ptyfs_update }, /* update */
{ &vop_bwrite_desc, ptyfs_bwrite }, /* bwrite */
{ &vop_putpages_desc, ptyfs_putpages }, /* putpages */
{ NULL, NULL }
};
const struct vnodeopv_desc ptyfs_vnodeop_opv_desc =
{ &ptyfs_vnodeop_p, ptyfs_vnodeop_entries };
/*
* _reclaim is called when getnewvnode()
* wants to make use of an entry on the vnode
* free list. at this time the filesystem needs
* to free any private data and remove the node
* from any private lists.
*/
int
ptyfs_reclaim(void *v)
{
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap = v;
return ptyfs_freevp(ap->a_vp);
}
/*
* Return POSIX pathconf information applicable to special devices.
*/
int
ptyfs_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 EINVAL;
}
}
/*
* _print is used for debugging.
* just print a readable description
* of (vp).
*/
int
ptyfs_print(void *v)
{
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap = v;
struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp);
printf("tag VT_PTYFS, type %d, pty %d\n",
ptyfs->ptyfs_type, ptyfs->ptyfs_pty);
return 0;
}
/*
* Invent attributes for ptyfsnode (vp) and store
* them in (vap).
* Directories lengths are returned as zero since
* any real length would require the genuine size
* to be computed, and nothing cares anyway.
*
* this is relatively minimal for ptyfs.
*/
int
ptyfs_getattr(void *v)
{
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp);
struct vattr *vap = ap->a_vap;
struct timespec ts;
TIMEVAL_TO_TIMESPEC(&time, &ts);
ptyfs_time(ptyfs, &ts, &ts);
/* start by zeroing out the attributes */
VATTR_NULL(vap);
/* next do all the common fields */
vap->va_type = ap->a_vp->v_type;
vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0];
vap->va_fileid = ptyfs->ptyfs_fileno;
vap->va_gen = 0;
vap->va_flags = 0;
vap->va_nlink = 1;
vap->va_blocksize = PAGE_SIZE;
vap->va_atime = ptyfs->ptyfs_atime;
vap->va_mtime = ptyfs->ptyfs_mtime;
vap->va_ctime = ptyfs->ptyfs_ctime;
vap->va_birthtime = ptyfs->ptyfs_birthtime;
vap->va_mode = ptyfs->ptyfs_mode;
vap->va_flags = ptyfs->ptyfs_flags;
vap->va_uid = ptyfs->ptyfs_uid;
vap->va_gid = ptyfs->ptyfs_gid;
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
case PTYFSptc:
if (pty_isfree(ptyfs->ptyfs_pty, 1))
return ENOENT;
vap->va_bytes = vap->va_size = 0;
vap->va_rdev = ap->a_vp->v_rdev;
break;
case PTYFSroot:
vap->va_rdev = 0;
vap->va_bytes = vap->va_size = DEV_BSIZE;
break;
default:
return EOPNOTSUPP;
}
return 0;
}
/*ARGSUSED*/
int
ptyfs_setattr(void *v)
{
struct vop_setattr_args /* {
struct vnodeop_desc *a_desc;
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct proc *p = ap->a_p;
int error;
if (vap->va_size != VNOVAL) {
switch (ptyfs->ptyfs_type) {
case PTYFSroot:
return EISDIR;
case PTYFSpts:
case PTYFSptc:
break;
default:
return EINVAL;
}
}
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
if (cred->cr_uid != ptyfs->ptyfs_uid &&
(error = suser(cred, &p->p_acflag)) != 0)
return error;
if (cred->cr_uid == 0) {
if ((ptyfs->ptyfs_flags & (SF_IMMUTABLE | SF_APPEND)) &&
securelevel > 0)
return EPERM;
/* Snapshot flag cannot be set or cleared */
if ((vap->va_flags & SF_SNAPSHOT) !=
(ptyfs->ptyfs_flags & SF_SNAPSHOT))
return EPERM;
ptyfs->ptyfs_flags = vap->va_flags;
} else {
if ((ptyfs->ptyfs_flags & (SF_IMMUTABLE | SF_APPEND)) ||
(vap->va_flags & UF_SETTABLE) != vap->va_flags)
return EPERM;
if ((ptyfs->ptyfs_flags & SF_SETTABLE) !=
(vap->va_flags & SF_SETTABLE))
return EPERM;
ptyfs->ptyfs_flags &= SF_SETTABLE;
ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE);
}
ptyfs->ptyfs_flag |= PTYFS_CHANGE;
if (vap->va_flags & (IMMUTABLE | APPEND))
return 0;
}
if (ptyfs->ptyfs_flags & (IMMUTABLE | APPEND))
return EPERM;
/*
* Go through the fields and update iff not VNOVAL.
*/
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
if (ptyfs->ptyfs_type == PTYFSroot)
return EPERM;
error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, p);
if (error)
return error;
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL ||
vap->va_birthtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0)
return EPERM;
if (cred->cr_uid != ptyfs->ptyfs_uid &&
(error = suser(cred, &p->p_acflag)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0))
return (error);
if (vap->va_atime.tv_sec != VNOVAL)
if (!(vp->v_mount->mnt_flag & MNT_NOATIME))
ptyfs->ptyfs_flag |= PTYFS_ACCESS;
if (vap->va_mtime.tv_sec != VNOVAL)
ptyfs->ptyfs_flag |= PTYFS_CHANGE | PTYFS_MODIFY;
if (vap->va_birthtime.tv_sec != VNOVAL)
ptyfs->ptyfs_birthtime = vap->va_birthtime;
ptyfs->ptyfs_flag |= PTYFS_CHANGE;
error = VOP_UPDATE(vp, &vap->va_atime, &vap->va_mtime, 0);
if (error)
return error;
}
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return EROFS;
if (ptyfs->ptyfs_type == PTYFSroot)
return EPERM;
if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 &&
(vap->va_mode &
(S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH)))
return EPERM;
error = ptyfs_chmod(vp, vap->va_mode, cred, p);
if (error)
return error;
}
VN_KNOTE(vp, NOTE_ATTRIB);
return 0;
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ptyfs_chmod(struct vnode *vp, mode_t mode, struct ucred *cred, struct proc *p)
{
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
int error;
if (cred->cr_uid != ptyfs->ptyfs_uid &&
(error = suser(cred, &p->p_acflag)) != 0)
return error;
ptyfs->ptyfs_mode &= ~ALLPERMS;
ptyfs->ptyfs_mode |= (mode & ALLPERMS);
return 0;
}
/*
* Perform chown operation on inode ip;
* inode must be locked prior to call.
*/
static int
ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
struct proc *p)
{
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
int error;
if (uid == (uid_t)VNOVAL)
uid = ptyfs->ptyfs_uid;
if (gid == (gid_t)VNOVAL)
gid = ptyfs->ptyfs_gid;
/*
* If we don't own the file, are trying to change the owner
* of the file, or are not a member of the target group,
* the caller's credentials must imply super-user privilege
* or the call fails.
*/
if ((cred->cr_uid != ptyfs->ptyfs_uid || uid != ptyfs->ptyfs_uid ||
(gid != ptyfs->ptyfs_gid &&
!(cred->cr_gid == gid || groupmember((gid_t)gid, cred)))) &&
((error = suser(cred, &p->p_acflag)) != 0))
return error;
ptyfs->ptyfs_gid = gid;
ptyfs->ptyfs_uid = uid;
return 0;
}
/*
* implement access checking.
*
* actually, the check for super-user is slightly
* broken since it will allow read access to write-only
* objects. this doesn't cause any particular trouble
* but does mean that the i/o entry points need to check
* that the operation really does make sense.
*/
int
ptyfs_access(void *v)
{
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vattr va;
int error;
if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred, ap->a_p)) != 0)
return error;
return vaccess(va.va_type, va.va_mode,
va.va_uid, va.va_gid, ap->a_mode, ap->a_cred);
}
/*
* lookup. this is incredibly complicated in the
* general case, however for most pseudo-filesystems
* very little needs to be done.
*
* Locking isn't hard here, just poorly documented.
*
* If we're looking up ".", just vref the parent & return it.
*
* If we're looking up "..", unlock the parent, and lock "..". If everything
* went ok, and we're on the last component and the caller requested the
* parent locked, try to re-lock the parent. We do this to prevent lock
* races.
*
* For anything else, get the needed node. Then unlock the parent if not
* the last component or not LOCKPARENT (i.e. if we wouldn't re-lock the
* parent in the .. case).
*
* We try to exit with the parent locked in error cases.
*/
int
ptyfs_lookup(void *v)
{
struct vop_lookup_args /* {
struct vnode * a_dvp;
struct vnode ** a_vpp;
struct componentname * a_cnp;
} */ *ap = v;
struct componentname *cnp = ap->a_cnp;
struct vnode **vpp = ap->a_vpp;
struct vnode *dvp = ap->a_dvp;
const char *pname = cnp->cn_nameptr;
struct ptyfsnode *ptyfs;
int pty, error, wantpunlock;
*vpp = NULL;
cnp->cn_flags &= ~PDIRUNLOCK;
if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
return EROFS;
if (cnp->cn_namelen == 1 && *pname == '.') {
*vpp = dvp;
VREF(dvp);
return 0;
}
wantpunlock = ~cnp->cn_flags & (LOCKPARENT | ISLASTCN);
ptyfs = VTOPTYFS(dvp);
switch (ptyfs->ptyfs_type) {
case PTYFSroot:
/*
* Shouldn't get here with .. in the root node.
*/
if (cnp->cn_flags & ISDOTDOT)
return EIO;
pty = atoi(pname, cnp->cn_namelen);
if (pty < 0 || pty >= npty || pty_isfree(pty, 1))
break;
error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty,
curproc);
if (error == 0 && wantpunlock) {
VOP_UNLOCK(dvp, 0);
cnp->cn_flags |= PDIRUNLOCK;
}
return error;
default:
return ENOTDIR;
}
return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS;
}
/*
* readdir returns directory entries from ptyfsnode (vp).
*
* the strategy here with ptyfs is to generate a single
* directory entry at a time (struct dirent) and then
* copy that out to userland using uiomove. a more efficent
* though more complex implementation, would try to minimize
* the number of calls to uiomove(). for ptyfs, this is
* hardly worth the added code complexity.
*
* this should just be done through read()
*/
int
ptyfs_readdir(void *v)
{
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
off_t **a_cookies;
int *a_ncookies;
} */ *ap = v;
struct uio *uio = ap->a_uio;
struct dirent d;
struct ptyfsnode *ptyfs;
off_t i;
int error;
off_t *cookies = NULL;
int ncookies;
struct vnode *vp;
int nc = 0;
vp = ap->a_vp;
ptyfs = VTOPTYFS(vp);
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, sizeof(d));
d.d_reclen = UIO_MX;
ncookies = uio->uio_resid / UIO_MX;
switch (ptyfs->ptyfs_type) {
case PTYFSroot: /* root */
if (i >= npty)
return 0;
if (ap->a_ncookies) {
ncookies = min(ncookies, (npty + 2 - i));
cookies = malloc(ncookies * sizeof (off_t),
M_TEMP, M_WAITOK);
*ap->a_cookies = cookies;
}
for (; i < 2; i++) {
switch (i) {
case 0: /* `.' */
case 1: /* `..' */
d.d_fileno = PTYFS_FILENO(0, PTYFSroot);
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;
}
if ((error = uiomove(&d, UIO_MX, uio)) != 0)
break;
if (cookies)
*cookies++ = i + 1;
nc++;
}
if (error) {
ncookies = nc;
break;
}
for (; uio->uio_resid >= UIO_MX && i < npty; i++) {
/* check for used ptys */
if (pty_isfree(i - 2, 1))
continue;
d.d_fileno = PTYFS_FILENO(i - 2, PTYFSpts);
d.d_namlen = snprintf(d.d_name, sizeof(d.d_name),
"%lld", (long long)(i - 2));
d.d_type = DT_CHR;
if ((error = uiomove(&d, UIO_MX, uio)) != 0)
break;
if (cookies)
*cookies++ = i + 1;
nc++;
}
ncookies = nc;
break;
default:
error = ENOTDIR;
break;
}
if (ap->a_ncookies) {
if (error) {
if (cookies)
free(*ap->a_cookies, M_TEMP);
*ap->a_ncookies = 0;
*ap->a_cookies = NULL;
} else
*ap->a_ncookies = ncookies;
}
uio->uio_offset = i;
return error;
}
int
ptyfs_open(void *v)
{
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
ptyfs->ptyfs_flag |= PTYFS_CHANGE|PTYFS_ACCESS;
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
case PTYFSptc:
return spec_open(v);
case PTYFSroot:
return 0;
default:
return EINVAL;
}
}
int
ptyfs_close(void *v)
{
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
struct timespec ts;
simple_lock(&vp->v_interlock);
if (vp->v_usecount > 1) {
TIMEVAL_TO_TIMESPEC(&time, &ts);
ptyfs_time(ptyfs, &ts, &ts);
}
simple_unlock(&vp->v_interlock);
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
case PTYFSptc:
return spec_close(v);
case PTYFSroot:
return 0;
default:
return EINVAL;
}
}
int
ptyfs_read(void *v)
{
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
int error;
ptyfs->ptyfs_flag |= PTYFS_ACCESS;
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
VOP_UNLOCK(vp, 0);
error = (*pts_cdevsw.d_read)(vp->v_rdev, ap->a_uio,
ap->a_ioflag);
vn_lock(vp, LK_RETRY|LK_EXCLUSIVE);
return error;
case PTYFSptc:
VOP_UNLOCK(vp, 0);
error = (*ptc_cdevsw.d_read)(vp->v_rdev, ap->a_uio,
ap->a_ioflag);
vn_lock(vp, LK_RETRY|LK_EXCLUSIVE);
return error;
default:
return EOPNOTSUPP;
}
}
int
ptyfs_write(void *v)
{
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap = v;
int error;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
ptyfs->ptyfs_flag |= PTYFS_MODIFY;
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
VOP_UNLOCK(vp, 0);
error = (*pts_cdevsw.d_write)(vp->v_rdev, ap->a_uio,
ap->a_ioflag);
vn_lock(vp, LK_RETRY|LK_EXCLUSIVE);
return error;
case PTYFSptc:
VOP_UNLOCK(vp, 0);
error = (*ptc_cdevsw.d_write)(vp->v_rdev, ap->a_uio,
ap->a_ioflag);
vn_lock(vp, LK_RETRY|LK_EXCLUSIVE);
return error;
default:
return EOPNOTSUPP;
}
}
int
ptyfs_ioctl(void *v)
{
struct vop_ioctl_args /* {
struct vnode *a_vp;
u_long a_command;
void *a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
return (*pts_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command,
ap->a_data, ap->a_fflag, ap->a_p);
case PTYFSptc:
return (*ptc_cdevsw.d_ioctl)(vp->v_rdev, ap->a_command,
ap->a_data, ap->a_fflag, ap->a_p);
default:
return EOPNOTSUPP;
}
}
int
ptyfs_poll(void *v)
{
struct vop_poll_args /* {
struct vnode *a_vp;
int a_events;
struct proc *a_p;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
return (*pts_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_p);
case PTYFSptc:
return (*ptc_cdevsw.d_poll)(vp->v_rdev, ap->a_events, ap->a_p);
default:
return genfs_poll(v);
}
}
int
ptyfs_kqfilter(void *v)
{
struct vop_kqfilter_args /* {
struct vnode *a_vp;
struct knote *a_kn;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct ptyfsnode *ptyfs = VTOPTYFS(vp);
switch (ptyfs->ptyfs_type) {
case PTYFSpts:
return (*pts_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn);
case PTYFSptc:
return (*ptc_cdevsw.d_kqfilter)(vp->v_rdev, ap->a_kn);
default:
return genfs_kqfilter(v);
}
}
int
ptyfs_update(v)
void *v;
{
struct vop_update_args /* {
struct vnode *a_vp;
struct timespec *a_access;
struct timespec *a_modify;
int a_flags;
} */ *ap = v;
struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp);
struct timespec ts;
if (ap->a_vp->v_mount->mnt_flag & MNT_RDONLY)
return 0;
TIMEVAL_TO_TIMESPEC(&time, &ts);
if (ap->a_access == NULL)
ap->a_access = &ts;
if (ap->a_modify == NULL)
ap->a_modify = &ts;
ptyfs_time(ptyfs, ap->a_access, ap->a_modify);
return 0;
}
static void
ptyfs_time(struct ptyfsnode *ptyfs, struct timespec *atime,
struct timespec *mtime)
{
if (ptyfs->ptyfs_flag & PTYFS_MODIFY) {
ptyfs->ptyfs_mtime = *mtime;
ptyfs->ptyfs_atime = *atime;
} else if (ptyfs->ptyfs_flag & PTYFS_ACCESS)
ptyfs->ptyfs_atime = *atime;
if (ptyfs->ptyfs_flag & PTYFS_CHANGE)
ptyfs->ptyfs_ctime = *atime;
ptyfs->ptyfs_flag = 0;
}
/*
* convert decimal ascii to int
*/
static int
atoi(const char *b, size_t len)
{
int p = 0;
while (len--) {
char c = *b++;
if (c < '0' || c > '9')
return -1;
p = 10 * p + (c - '0');
}
return p;
}
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