ff7c5a4880
jest, of most excellent fancy: he hath taught me lessons a thousand times; and now, how abhorred in my imagination it is! my gorge rises at it. Here were those hacks that I have curs'd I know not how oft. Where be your kludges now? your workarounds? your layering violations, that were wont to set the table on a roar? Move the skeleton of specfs into devfs where it now belongs and bury the rest.
1448 lines
34 KiB
C
1448 lines
34 KiB
C
/*
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* Copyright (c) 2000-2004
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* Poul-Henning Kamp. All rights reserved.
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* Copyright (c) 1989, 1992-1993, 1995
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kernfs_vnops.c 8.15 (Berkeley) 5/21/95
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* From: FreeBSD: src/sys/miscfs/kernfs/kernfs_vnops.c 1.43
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*
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* $FreeBSD$
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*/
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/*
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* TODO:
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* remove empty directories
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* mknod: hunt down DE_DELETED, compare name, reinstantiate.
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* mkdir: want it ?
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*/
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#include <opt_devfs.h>
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#include <opt_mac.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/conf.h>
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#include <sys/dirent.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mac.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/time.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#include <fs/devfs/devfs.h>
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static int devfs_access(struct vop_access_args *ap);
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static int devfs_advlock(struct vop_advlock_args *ap);
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static int devfs_close(struct vop_close_args *ap);
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static int devfs_fsync(struct vop_fsync_args *ap);
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static int devfs_getattr(struct vop_getattr_args *ap);
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static int devfs_ioctl(struct vop_ioctl_args *ap);
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static int devfs_kqfilter(struct vop_kqfilter_args *ap);
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static int devfs_lookupx(struct vop_lookup_args *ap);
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static int devfs_mknod(struct vop_mknod_args *ap);
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static int devfs_open(struct vop_open_args *ap);
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static int devfs_pathconf(struct vop_pathconf_args *ap);
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static int devfs_poll(struct vop_poll_args *ap);
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static int devfs_print(struct vop_print_args *ap);
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static int devfs_read(struct vop_read_args *ap);
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static int devfs_readdir(struct vop_readdir_args *ap);
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static int devfs_readlink(struct vop_readlink_args *ap);
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static int devfs_reclaim(struct vop_reclaim_args *ap);
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static int devfs_remove(struct vop_remove_args *ap);
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static int devfs_revoke(struct vop_revoke_args *ap);
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static int devfs_rioctl(struct vop_ioctl_args *ap);
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static int devfs_rread(struct vop_read_args *ap);
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static int devfs_setattr(struct vop_setattr_args *ap);
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#ifdef MAC
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static int devfs_setlabel(struct vop_setlabel_args *ap);
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#endif
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static int devfs_specstrategy(struct vop_specstrategy_args *);
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static int devfs_symlink(struct vop_symlink_args *ap);
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static int devfs_write(struct vop_write_args *ap);
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static vop_t **devfs_vnodeop_p;
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vop_t **devfs_specop_p;
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/*
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* Construct the fully qualified path name relative to the mountpoint
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*/
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static char *
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devfs_fqpn(char *buf, struct vnode *dvp, struct componentname *cnp)
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{
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int i;
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struct devfs_dirent *de, *dd;
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struct devfs_mount *dmp;
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dmp = VFSTODEVFS(dvp->v_mount);
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dd = dvp->v_data;
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i = SPECNAMELEN;
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buf[i] = '\0';
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i -= cnp->cn_namelen;
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if (i < 0)
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return (NULL);
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bcopy(cnp->cn_nameptr, buf + i, cnp->cn_namelen);
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de = dd;
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while (de != dmp->dm_basedir) {
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i--;
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if (i < 0)
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return (NULL);
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buf[i] = '/';
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i -= de->de_dirent->d_namlen;
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if (i < 0)
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return (NULL);
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bcopy(de->de_dirent->d_name, buf + i,
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de->de_dirent->d_namlen);
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de = TAILQ_FIRST(&de->de_dlist); /* "." */
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de = TAILQ_NEXT(de, de_list); /* ".." */
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de = de->de_dir;
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}
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return (buf + i);
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}
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int
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devfs_allocv(struct devfs_dirent *de, struct mount *mp, struct vnode **vpp, struct thread *td)
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{
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int error;
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struct vnode *vp;
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struct cdev *dev;
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KASSERT(td == curthread, ("devfs_allocv: td != curthread"));
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loop:
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vp = de->de_vnode;
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if (vp != NULL) {
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if (vget(vp, LK_EXCLUSIVE, td))
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goto loop;
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*vpp = vp;
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return (0);
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}
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if (de->de_dirent->d_type == DT_CHR) {
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dev = *devfs_itod(de->de_inode);
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if (dev == NULL)
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return (ENOENT);
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} else {
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dev = NULL;
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}
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error = getnewvnode("devfs", mp, devfs_vnodeop_p, &vp);
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if (error != 0) {
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printf("devfs_allocv: failed to allocate new vnode\n");
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return (error);
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}
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if (de->de_dirent->d_type == DT_CHR) {
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vp->v_type = VCHR;
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vp = addaliasu(vp, dev->si_udev);
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vp->v_op = devfs_specop_p;
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} else if (de->de_dirent->d_type == DT_DIR) {
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vp->v_type = VDIR;
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} else if (de->de_dirent->d_type == DT_LNK) {
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vp->v_type = VLNK;
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} else {
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vp->v_type = VBAD;
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}
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vp->v_data = de;
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de->de_vnode = vp;
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vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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#ifdef MAC
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mac_associate_vnode_devfs(mp, de, vp);
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#endif
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*vpp = vp;
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return (0);
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}
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static int
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devfs_access(ap)
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struct vop_access_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct devfs_dirent *de;
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int error;
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de = vp->v_data;
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if (vp->v_type == VDIR)
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de = de->de_dir;
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error = vaccess(vp->v_type, de->de_mode, de->de_uid, de->de_gid,
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ap->a_mode, ap->a_cred, NULL);
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if (!error)
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return (error);
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if (error != EACCES)
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return (error);
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/* We do, however, allow access to the controlling terminal */
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if (!(ap->a_td->td_proc->p_flag & P_CONTROLT))
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return (error);
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if (ap->a_td->td_proc->p_session->s_ttyvp == de->de_vnode)
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return (0);
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return (error);
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}
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/*
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* Special device advisory byte-level locks.
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*/
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/* ARGSUSED */
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static int
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devfs_advlock(ap)
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struct vop_advlock_args /* {
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struct vnode *a_vp;
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caddr_t a_id;
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int a_op;
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struct flock *a_fl;
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int a_flags;
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} */ *ap;
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{
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return (ap->a_flags & F_FLOCK ? EOPNOTSUPP : EINVAL);
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}
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/*
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* Device close routine
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*/
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/* ARGSUSED */
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static int
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devfs_close(ap)
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struct vop_close_args /* {
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struct vnode *a_vp;
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int a_fflag;
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struct ucred *a_cred;
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struct thread *a_td;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp, *oldvp;
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struct thread *td = ap->a_td;
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struct cdev *dev = vp->v_rdev;
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struct cdevsw *dsw;
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int error;
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/*
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* Hack: a tty device that is a controlling terminal
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* has a reference from the session structure.
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* We cannot easily tell that a character device is
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* a controlling terminal, unless it is the closing
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* process' controlling terminal. In that case,
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* if the reference count is 2 (this last descriptor
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* plus the session), release the reference from the session.
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*/
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/*
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* This needs to be rewritten to take the vp interlock into
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* consideration.
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*/
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oldvp = NULL;
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sx_xlock(&proctree_lock);
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if (td && vp == td->td_proc->p_session->s_ttyvp) {
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SESS_LOCK(td->td_proc->p_session);
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VI_LOCK(vp);
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if (count_dev(dev) == 2 && (vp->v_iflag & VI_XLOCK) == 0) {
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td->td_proc->p_session->s_ttyvp = NULL;
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oldvp = vp;
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}
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VI_UNLOCK(vp);
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SESS_UNLOCK(td->td_proc->p_session);
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}
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sx_xunlock(&proctree_lock);
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if (oldvp != NULL)
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vrele(oldvp);
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/*
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* We do not want to really close the device if it
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* is still in use unless we are trying to close it
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* forcibly. Since every use (buffer, vnode, swap, cmap)
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* holds a reference to the vnode, and because we mark
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* any other vnodes that alias this device, when the
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* sum of the reference counts on all the aliased
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* vnodes descends to one, we are on last close.
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*/
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dsw = dev_refthread(dev);
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if (dsw == NULL)
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return (ENXIO);
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VI_LOCK(vp);
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if (vp->v_iflag & VI_XLOCK) {
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/* Forced close. */
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} else if (dsw->d_flags & D_TRACKCLOSE) {
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/* Keep device updated on status. */
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} else if (count_dev(dev) > 1) {
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VI_UNLOCK(vp);
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dev_relthread(dev);
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return (0);
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}
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VI_UNLOCK(vp);
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KASSERT(dev->si_refcount > 0,
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("devfs_close() on un-referenced struct cdev *(%s)", devtoname(dev)));
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if (!(dsw->d_flags & D_NEEDGIANT)) {
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DROP_GIANT();
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error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
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PICKUP_GIANT();
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} else
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error = dsw->d_close(dev, ap->a_fflag, S_IFCHR, td);
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dev_relthread(dev);
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return (error);
|
|
}
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|
|
/*
|
|
* Synch buffers associated with a block device
|
|
*/
|
|
/* ARGSUSED */
|
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static int
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devfs_fsync(ap)
|
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struct vop_fsync_args /* {
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struct vnode *a_vp;
|
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struct ucred *a_cred;
|
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int a_waitfor;
|
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struct thread *a_td;
|
|
} */ *ap;
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{
|
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if (!vn_isdisk(ap->a_vp, NULL))
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return (0);
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|
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return (vop_stdfsync(ap));
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|
}
|
|
|
|
static int
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|
devfs_getattr(ap)
|
|
struct vop_getattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
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{
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|
struct vnode *vp = ap->a_vp;
|
|
struct vattr *vap = ap->a_vap;
|
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int error = 0;
|
|
struct devfs_dirent *de;
|
|
struct cdev *dev;
|
|
|
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de = vp->v_data;
|
|
if (vp->v_type == VDIR)
|
|
de = de->de_dir;
|
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bzero((caddr_t) vap, sizeof(*vap));
|
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vattr_null(vap);
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vap->va_uid = de->de_uid;
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vap->va_gid = de->de_gid;
|
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vap->va_mode = de->de_mode;
|
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if (vp->v_type == VLNK)
|
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vap->va_size = strlen(de->de_symlink);
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else if (vp->v_type == VDIR)
|
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vap->va_size = vap->va_bytes = DEV_BSIZE;
|
|
else
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vap->va_size = 0;
|
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if (vp->v_type != VDIR)
|
|
vap->va_bytes = 0;
|
|
vap->va_blocksize = DEV_BSIZE;
|
|
vap->va_type = vp->v_type;
|
|
|
|
#define fix(aa) \
|
|
do { \
|
|
if ((aa).tv_sec == 0) { \
|
|
(aa).tv_sec = boottime.tv_sec; \
|
|
(aa).tv_nsec = boottime.tv_usec * 1000; \
|
|
} \
|
|
} while (0)
|
|
|
|
if (vp->v_type != VCHR) {
|
|
fix(de->de_atime);
|
|
vap->va_atime = de->de_atime;
|
|
fix(de->de_mtime);
|
|
vap->va_mtime = de->de_mtime;
|
|
fix(de->de_ctime);
|
|
vap->va_ctime = de->de_ctime;
|
|
} else {
|
|
dev = vp->v_rdev;
|
|
fix(dev->si_atime);
|
|
vap->va_atime = dev->si_atime;
|
|
fix(dev->si_mtime);
|
|
vap->va_mtime = dev->si_mtime;
|
|
fix(dev->si_ctime);
|
|
vap->va_ctime = dev->si_ctime;
|
|
vap->va_rdev = dev->si_udev;
|
|
}
|
|
vap->va_gen = 0;
|
|
vap->va_flags = 0;
|
|
vap->va_nlink = de->de_links;
|
|
vap->va_fileid = de->de_inode;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Device ioctl operation.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_ioctl(ap)
|
|
struct vop_ioctl_args /* {
|
|
struct vnode *a_vp;
|
|
u_long a_command;
|
|
caddr_t a_data;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct cdev *dev;
|
|
int error;
|
|
struct cdevsw *dsw;
|
|
|
|
dev = ap->a_vp->v_rdev;
|
|
dsw = dev_refthread(dev);
|
|
if (dsw == NULL)
|
|
return (ENXIO);
|
|
KASSERT(dev->si_refcount > 0,
|
|
("devfs_ioctl() on un-referenced struct cdev *(%s)", devtoname(dev)));
|
|
if (!(dsw->d_flags & D_NEEDGIANT)) {
|
|
DROP_GIANT();
|
|
error = dsw->d_ioctl(dev, ap->a_command,
|
|
ap->a_data, ap->a_fflag, ap->a_td);
|
|
PICKUP_GIANT();
|
|
} else
|
|
error = dsw->d_ioctl(dev, ap->a_command,
|
|
ap->a_data, ap->a_fflag, ap->a_td);
|
|
dev_relthread(dev);
|
|
if (error == ENOIOCTL)
|
|
error = ENOTTY;
|
|
return (error);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_kqfilter(ap)
|
|
struct vop_kqfilter_args /* {
|
|
struct vnode *a_vp;
|
|
struct knote *a_kn;
|
|
} */ *ap;
|
|
{
|
|
struct cdev *dev;
|
|
struct cdevsw *dsw;
|
|
int error;
|
|
|
|
dev = ap->a_vp->v_rdev;
|
|
dsw = dev_refthread(dev);
|
|
if (dsw == NULL)
|
|
return(0);
|
|
KASSERT(dev->si_refcount > 0,
|
|
("devfs_kqfilter() on un-referenced struct cdev *(%s)", devtoname(dev)));
|
|
if (!(dsw->d_flags & D_NEEDGIANT)) {
|
|
DROP_GIANT();
|
|
error = dsw->d_kqfilter(dev, ap->a_kn);
|
|
PICKUP_GIANT();
|
|
} else
|
|
error = dsw->d_kqfilter(dev, ap->a_kn);
|
|
dev_relthread(dev);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_lookupx(ap)
|
|
struct vop_lookup_args /* {
|
|
struct vnode * a_dvp;
|
|
struct vnode ** a_vpp;
|
|
struct componentname * a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct componentname *cnp;
|
|
struct vnode *dvp, **vpp;
|
|
struct thread *td;
|
|
struct devfs_dirent *de, *dd;
|
|
struct devfs_dirent **dde;
|
|
struct devfs_mount *dmp;
|
|
struct cdev *cdev;
|
|
int error, flags, nameiop;
|
|
char specname[SPECNAMELEN + 1], *pname;
|
|
|
|
cnp = ap->a_cnp;
|
|
vpp = ap->a_vpp;
|
|
dvp = ap->a_dvp;
|
|
pname = cnp->cn_nameptr;
|
|
td = cnp->cn_thread;
|
|
flags = cnp->cn_flags;
|
|
nameiop = cnp->cn_nameiop;
|
|
dmp = VFSTODEVFS(dvp->v_mount);
|
|
dd = dvp->v_data;
|
|
|
|
*vpp = NULLVP;
|
|
cnp->cn_flags &= ~PDIRUNLOCK;
|
|
|
|
if ((flags & ISLASTCN) && nameiop == RENAME)
|
|
return (EOPNOTSUPP);
|
|
|
|
if (dvp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
if ((flags & ISDOTDOT) && (dvp->v_vflag & VV_ROOT))
|
|
return (EIO);
|
|
|
|
error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td);
|
|
if (error)
|
|
return (error);
|
|
|
|
if (cnp->cn_namelen == 1 && *pname == '.') {
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
*vpp = dvp;
|
|
VREF(dvp);
|
|
return (0);
|
|
}
|
|
|
|
if (flags & ISDOTDOT) {
|
|
if ((flags & ISLASTCN) && nameiop != LOOKUP)
|
|
return (EINVAL);
|
|
VOP_UNLOCK(dvp, 0, td);
|
|
cnp->cn_flags |= PDIRUNLOCK;
|
|
de = TAILQ_FIRST(&dd->de_dlist); /* "." */
|
|
de = TAILQ_NEXT(de, de_list); /* ".." */
|
|
de = de->de_dir;
|
|
error = devfs_allocv(de, dvp->v_mount, vpp, td);
|
|
if (error || ((flags & LOCKPARENT) && (flags & ISLASTCN))) {
|
|
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
cnp->cn_flags &= ~PDIRUNLOCK;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
devfs_populate(dmp);
|
|
dd = dvp->v_data;
|
|
TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
|
|
if (cnp->cn_namelen != de->de_dirent->d_namlen)
|
|
continue;
|
|
if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
|
|
de->de_dirent->d_namlen) != 0)
|
|
continue;
|
|
if (de->de_flags & DE_WHITEOUT)
|
|
goto notfound;
|
|
goto found;
|
|
}
|
|
|
|
if (nameiop == DELETE)
|
|
goto notfound;
|
|
|
|
/*
|
|
* OK, we didn't have an entry for the name we were asked for
|
|
* so we try to see if anybody can create it on demand.
|
|
*/
|
|
pname = devfs_fqpn(specname, dvp, cnp);
|
|
if (pname == NULL)
|
|
goto notfound;
|
|
|
|
cdev = NULL;
|
|
EVENTHANDLER_INVOKE(dev_clone, pname, strlen(pname), &cdev);
|
|
if (cdev == NULL)
|
|
goto notfound;
|
|
|
|
devfs_populate(dmp);
|
|
|
|
dde = devfs_itode(dmp, cdev->si_inode);
|
|
|
|
if (dde == NULL || *dde == NULL || *dde == DE_DELETED)
|
|
goto notfound;
|
|
|
|
if ((*dde)->de_flags & DE_WHITEOUT)
|
|
goto notfound;
|
|
|
|
de = *dde;
|
|
goto found;
|
|
|
|
notfound:
|
|
|
|
if ((nameiop == CREATE || nameiop == RENAME) &&
|
|
(flags & (LOCKPARENT | WANTPARENT)) && (flags & ISLASTCN)) {
|
|
cnp->cn_flags |= SAVENAME;
|
|
if (!(flags & LOCKPARENT)) {
|
|
VOP_UNLOCK(dvp, 0, td);
|
|
cnp->cn_flags |= PDIRUNLOCK;
|
|
}
|
|
return (EJUSTRETURN);
|
|
}
|
|
return (ENOENT);
|
|
|
|
|
|
found:
|
|
|
|
if ((cnp->cn_nameiop == DELETE) && (flags & ISLASTCN)) {
|
|
error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred, td);
|
|
if (error)
|
|
return (error);
|
|
if (*vpp == dvp) {
|
|
VREF(dvp);
|
|
*vpp = dvp;
|
|
return (0);
|
|
}
|
|
error = devfs_allocv(de, dvp->v_mount, vpp, td);
|
|
if (error)
|
|
return (error);
|
|
if (!(flags & LOCKPARENT)) {
|
|
VOP_UNLOCK(dvp, 0, td);
|
|
cnp->cn_flags |= PDIRUNLOCK;
|
|
}
|
|
return (0);
|
|
}
|
|
error = devfs_allocv(de, dvp->v_mount, vpp, td);
|
|
if (error)
|
|
return (error);
|
|
if (!(flags & LOCKPARENT) || !(flags & ISLASTCN)) {
|
|
VOP_UNLOCK(dvp, 0, td);
|
|
cnp->cn_flags |= PDIRUNLOCK;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_lookup(struct vop_lookup_args *ap)
|
|
{
|
|
int j;
|
|
struct devfs_mount *dmp;
|
|
|
|
dmp = VFSTODEVFS(ap->a_dvp->v_mount);
|
|
lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
|
|
j = devfs_lookupx(ap);
|
|
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
|
|
return (j);
|
|
}
|
|
|
|
static int
|
|
devfs_mknod(struct vop_mknod_args *ap)
|
|
/*
|
|
struct vop_mknod_args {
|
|
struct vnodeop_desc *a_desc;
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
}; */
|
|
{
|
|
struct componentname *cnp;
|
|
struct vnode *dvp, **vpp;
|
|
struct thread *td;
|
|
struct devfs_dirent *dd, *de;
|
|
struct devfs_mount *dmp;
|
|
int error;
|
|
|
|
dvp = ap->a_dvp;
|
|
dmp = VFSTODEVFS(dvp->v_mount);
|
|
lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
|
|
|
|
cnp = ap->a_cnp;
|
|
vpp = ap->a_vpp;
|
|
td = cnp->cn_thread;
|
|
dd = dvp->v_data;
|
|
|
|
error = ENOENT;
|
|
TAILQ_FOREACH(de, &dd->de_dlist, de_list) {
|
|
if (cnp->cn_namelen != de->de_dirent->d_namlen)
|
|
continue;
|
|
if (bcmp(cnp->cn_nameptr, de->de_dirent->d_name,
|
|
de->de_dirent->d_namlen) != 0)
|
|
continue;
|
|
if (de->de_flags & DE_WHITEOUT)
|
|
break;
|
|
goto notfound;
|
|
}
|
|
if (de == NULL)
|
|
goto notfound;
|
|
de->de_flags &= ~DE_WHITEOUT;
|
|
error = devfs_allocv(de, dvp->v_mount, vpp, td);
|
|
notfound:
|
|
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Open a special file.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_open(ap)
|
|
struct vop_open_args /* {
|
|
struct vnode *a_vp;
|
|
int a_mode;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct thread *td = ap->a_td;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct cdev *dev = vp->v_rdev;
|
|
int error;
|
|
struct cdevsw *dsw;
|
|
|
|
if (vp->v_type == VBLK)
|
|
return (ENXIO);
|
|
|
|
/* Don't allow open if fs is mounted -nodev. */
|
|
if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_NODEV))
|
|
return (ENXIO);
|
|
|
|
if (dev == NULL)
|
|
return (ENXIO);
|
|
|
|
/* Make this field valid before any I/O in d_open. */
|
|
if (dev->si_iosize_max == 0)
|
|
dev->si_iosize_max = DFLTPHYS;
|
|
|
|
/*
|
|
* XXX: Disks get special billing here, but it is mostly wrong.
|
|
* XXX: Disk partitions can overlap and the real checks should
|
|
* XXX: take this into account, and consequently they need to
|
|
* XXX: live in the disk slice code. Some checks do.
|
|
*/
|
|
if (vn_isdisk(vp, NULL) && ap->a_cred != FSCRED &&
|
|
(ap->a_mode & FWRITE)) {
|
|
/*
|
|
* Never allow opens for write if the disk is mounted R/W.
|
|
*/
|
|
if (vp->v_rdev->si_mountpoint != NULL &&
|
|
!(vp->v_rdev->si_mountpoint->mnt_flag & MNT_RDONLY))
|
|
return (EBUSY);
|
|
|
|
/*
|
|
* When running in secure mode, do not allow opens
|
|
* for writing if the disk is mounted.
|
|
*/
|
|
error = securelevel_ge(td->td_ucred, 1);
|
|
if (error && vfs_mountedon(vp))
|
|
return (error);
|
|
|
|
/*
|
|
* When running in very secure mode, do not allow
|
|
* opens for writing of any disks.
|
|
*/
|
|
error = securelevel_ge(td->td_ucred, 2);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
dsw = dev_refthread(dev);
|
|
if (dsw == NULL)
|
|
return (ENXIO);
|
|
|
|
/* XXX: Special casing of ttys for deadfs. Probably redundant. */
|
|
if (dsw->d_flags & D_TTY)
|
|
vp->v_vflag |= VV_ISTTY;
|
|
|
|
VOP_UNLOCK(vp, 0, td);
|
|
|
|
if(!(dsw->d_flags & D_NEEDGIANT)) {
|
|
DROP_GIANT();
|
|
if (dsw->d_fdopen != NULL)
|
|
error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx);
|
|
else
|
|
error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
|
|
PICKUP_GIANT();
|
|
} else if (dsw->d_fdopen != NULL)
|
|
error = dsw->d_fdopen(dev, ap->a_mode, td, ap->a_fdidx);
|
|
else
|
|
error = dsw->d_open(dev, ap->a_mode, S_IFCHR, td);
|
|
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
|
|
dev_relthread(dev);
|
|
|
|
if (error)
|
|
return (error);
|
|
|
|
if (vn_isdisk(vp, NULL)) {
|
|
if (!dev->si_bsize_phys)
|
|
dev->si_bsize_phys = DEV_BSIZE;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
|
|
static int
|
|
devfs_pathconf(ap)
|
|
struct vop_pathconf_args /* {
|
|
struct vnode *a_vp;
|
|
int a_name;
|
|
int *a_retval;
|
|
} */ *ap;
|
|
{
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_NAME_MAX:
|
|
*ap->a_retval = NAME_MAX;
|
|
return (0);
|
|
case _PC_PATH_MAX:
|
|
*ap->a_retval = PATH_MAX;
|
|
return (0);
|
|
case _PC_MAC_PRESENT:
|
|
#ifdef MAC
|
|
/*
|
|
* If MAC is enabled, devfs automatically supports
|
|
* trivial non-persistant label storage.
|
|
*/
|
|
*ap->a_retval = 1;
|
|
#else
|
|
*ap->a_retval = 0;
|
|
#endif
|
|
return (0);
|
|
default:
|
|
return (vop_stdpathconf(ap));
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_poll(ap)
|
|
struct vop_poll_args /* {
|
|
struct vnode *a_vp;
|
|
int a_events;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct cdev *dev;
|
|
struct cdevsw *dsw;
|
|
int error;
|
|
|
|
dev = ap->a_vp->v_rdev;
|
|
dsw = dev_refthread(dev);
|
|
if (dsw == NULL)
|
|
return(0);
|
|
KASSERT(dev->si_refcount > 0,
|
|
("devfs_poll() on un-referenced struct cdev *(%s)", devtoname(dev)));
|
|
if (!(dsw->d_flags & D_NEEDGIANT)) {
|
|
/* XXX: not yet DROP_GIANT(); */
|
|
error = dsw->d_poll(dev, ap->a_events, ap->a_td);
|
|
/* XXX: not yet PICKUP_GIANT(); */
|
|
} else
|
|
error = dsw->d_poll(dev, ap->a_events, ap->a_td);
|
|
dev_relthread(dev);
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a special device vnode.
|
|
*/
|
|
static int
|
|
devfs_print(ap)
|
|
struct vop_print_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
|
|
printf("\tdev %s\n", devtoname(ap->a_vp->v_rdev));
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for read
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_read(ap)
|
|
struct vop_read_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp;
|
|
struct thread *td;
|
|
struct uio *uio;
|
|
struct cdev *dev;
|
|
int error, resid;
|
|
struct cdevsw *dsw;
|
|
|
|
vp = ap->a_vp;
|
|
dev = vp->v_rdev;
|
|
uio = ap->a_uio;
|
|
td = uio->uio_td;
|
|
resid = uio->uio_resid;
|
|
|
|
if (resid == 0)
|
|
return (0);
|
|
|
|
KASSERT(dev->si_refcount > 0,
|
|
("specread() on un-referenced struct cdev *(%s)", devtoname(dev)));
|
|
dsw = dev_refthread(dev);
|
|
if (dsw == NULL)
|
|
return (ENXIO);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
if (!(dsw->d_flags & D_NEEDGIANT)) {
|
|
DROP_GIANT();
|
|
error = dsw->d_read(dev, uio, ap->a_ioflag);
|
|
PICKUP_GIANT();
|
|
} else
|
|
error = dsw->d_read(dev, uio, ap->a_ioflag);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
dev_relthread(dev);
|
|
if (uio->uio_resid != resid || (error == 0 && resid != 0))
|
|
vfs_timestamp(&dev->si_atime);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_readdir(ap)
|
|
struct vop_readdir_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
int *a_eofflag;
|
|
int *a_ncookies;
|
|
u_long **a_cookies;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct uio *uio;
|
|
struct dirent *dp;
|
|
struct devfs_dirent *dd;
|
|
struct devfs_dirent *de;
|
|
struct devfs_mount *dmp;
|
|
off_t off, oldoff;
|
|
int ncookies = 0;
|
|
u_long *cookiebuf, *cookiep;
|
|
struct dirent *dps, *dpe;
|
|
|
|
if (ap->a_vp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
uio = ap->a_uio;
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
dmp = VFSTODEVFS(ap->a_vp->v_mount);
|
|
lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
|
|
devfs_populate(dmp);
|
|
error = 0;
|
|
de = ap->a_vp->v_data;
|
|
off = 0;
|
|
oldoff = uio->uio_offset;
|
|
TAILQ_FOREACH(dd, &de->de_dlist, de_list) {
|
|
if (dd->de_flags & DE_WHITEOUT)
|
|
continue;
|
|
if (dd->de_dirent->d_type == DT_DIR)
|
|
de = dd->de_dir;
|
|
else
|
|
de = dd;
|
|
dp = dd->de_dirent;
|
|
if (dp->d_reclen > uio->uio_resid)
|
|
break;
|
|
dp->d_fileno = de->de_inode;
|
|
if (off >= uio->uio_offset) {
|
|
ncookies++;
|
|
error = uiomove(dp, dp->d_reclen, uio);
|
|
if (error)
|
|
break;
|
|
}
|
|
off += dp->d_reclen;
|
|
}
|
|
if( !error && ap->a_ncookies != NULL && ap->a_cookies != NULL ) {
|
|
MALLOC(cookiebuf, u_long *, ncookies * sizeof(u_long),
|
|
M_TEMP, M_WAITOK);
|
|
cookiep = cookiebuf;
|
|
dps = (struct dirent *)((char *)uio->uio_iov->iov_base -
|
|
(uio->uio_offset - oldoff));
|
|
dpe = (struct dirent *) uio->uio_iov->iov_base;
|
|
for( dp = dps;
|
|
dp < dpe;
|
|
dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) {
|
|
oldoff += dp->d_reclen;
|
|
*cookiep++ = (u_long) oldoff;
|
|
}
|
|
*ap->a_ncookies = ncookies;
|
|
*ap->a_cookies = cookiebuf;
|
|
}
|
|
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
|
|
uio->uio_offset = off;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_readlink(ap)
|
|
struct vop_readlink_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cead;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct devfs_dirent *de;
|
|
|
|
de = ap->a_vp->v_data;
|
|
error = uiomove(de->de_symlink, strlen(de->de_symlink), ap->a_uio);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_reclaim(ap)
|
|
struct vop_reclaim_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct devfs_dirent *de;
|
|
int i;
|
|
|
|
de = vp->v_data;
|
|
if (de != NULL)
|
|
de->de_vnode = NULL;
|
|
vp->v_data = NULL;
|
|
if (vp->v_rdev != NULL && vp->v_rdev != NULL) {
|
|
i = vcount(vp);
|
|
if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0 &&
|
|
(vp->v_rdev->si_flags & SI_NAMED))
|
|
destroy_dev(vp->v_rdev);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_remove(ap)
|
|
struct vop_remove_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct devfs_dirent *dd;
|
|
struct devfs_dirent *de;
|
|
struct devfs_mount *dmp = VFSTODEVFS(vp->v_mount);
|
|
|
|
lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, curthread);
|
|
dd = ap->a_dvp->v_data;
|
|
de = vp->v_data;
|
|
if (de->de_dirent->d_type == DT_LNK) {
|
|
TAILQ_REMOVE(&dd->de_dlist, de, de_list);
|
|
if (de->de_vnode)
|
|
de->de_vnode->v_data = NULL;
|
|
#ifdef MAC
|
|
mac_destroy_devfsdirent(de);
|
|
#endif
|
|
FREE(de, M_DEVFS);
|
|
} else {
|
|
de->de_flags |= DE_WHITEOUT;
|
|
}
|
|
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Revoke is called on a tty when a terminal session ends. The vnode
|
|
* is orphaned by setting v_op to deadfs so we need to let go of it
|
|
* as well so that we create a new one next time around.
|
|
*/
|
|
static int
|
|
devfs_revoke(ap)
|
|
struct vop_revoke_args /* {
|
|
struct vnode *a_vp;
|
|
int a_flags;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct devfs_dirent *de;
|
|
|
|
de = vp->v_data;
|
|
de->de_vnode = NULL;
|
|
vop_revoke(ap);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_rioctl(ap)
|
|
struct vop_ioctl_args /* {
|
|
struct vnode *a_vp;
|
|
u_long a_command;
|
|
caddr_t a_data;
|
|
int a_fflag;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
int error;
|
|
struct devfs_mount *dmp;
|
|
|
|
dmp = VFSTODEVFS(ap->a_vp->v_mount);
|
|
lockmgr(&dmp->dm_lock, LK_SHARED, 0, curthread);
|
|
devfs_populate(dmp);
|
|
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, curthread);
|
|
error = devfs_rules_ioctl(ap->a_vp->v_mount, ap->a_command, ap->a_data,
|
|
ap->a_td);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
devfs_rread(ap)
|
|
struct vop_read_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
|
|
if (ap->a_vp->v_type != VDIR)
|
|
return (EINVAL);
|
|
return (VOP_READDIR(ap->a_vp, ap->a_uio, ap->a_cred, NULL, NULL, NULL));
|
|
}
|
|
|
|
static int
|
|
devfs_setattr(ap)
|
|
struct vop_setattr_args /* {
|
|
struct vnode *a_vp;
|
|
struct vattr *a_vap;
|
|
struct ucred *a_cred;
|
|
struct proc *a_p;
|
|
} */ *ap;
|
|
{
|
|
struct devfs_dirent *de;
|
|
struct vattr *vap;
|
|
struct vnode *vp;
|
|
int c, error;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
|
|
vap = ap->a_vap;
|
|
vp = ap->a_vp;
|
|
if ((vap->va_type != VNON) ||
|
|
(vap->va_nlink != VNOVAL) ||
|
|
(vap->va_fsid != VNOVAL) ||
|
|
(vap->va_fileid != VNOVAL) ||
|
|
(vap->va_blocksize != VNOVAL) ||
|
|
(vap->va_flags != VNOVAL && vap->va_flags != 0) ||
|
|
(vap->va_rdev != VNOVAL) ||
|
|
((int)vap->va_bytes != VNOVAL) ||
|
|
(vap->va_gen != VNOVAL)) {
|
|
return (EINVAL);
|
|
}
|
|
|
|
de = vp->v_data;
|
|
if (vp->v_type == VDIR)
|
|
de = de->de_dir;
|
|
|
|
error = c = 0;
|
|
if (vap->va_uid == (uid_t)VNOVAL)
|
|
uid = de->de_uid;
|
|
else
|
|
uid = vap->va_uid;
|
|
if (vap->va_gid == (gid_t)VNOVAL)
|
|
gid = de->de_gid;
|
|
else
|
|
gid = vap->va_gid;
|
|
if (uid != de->de_uid || gid != de->de_gid) {
|
|
if (((ap->a_cred->cr_uid != de->de_uid) || uid != de->de_uid ||
|
|
(gid != de->de_gid && !groupmember(gid, ap->a_cred))) &&
|
|
(error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)) != 0)
|
|
return (error);
|
|
de->de_uid = uid;
|
|
de->de_gid = gid;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_mode != (mode_t)VNOVAL) {
|
|
if ((ap->a_cred->cr_uid != de->de_uid) &&
|
|
(error = suser_cred(ap->a_td->td_ucred, SUSER_ALLOWJAIL)))
|
|
return (error);
|
|
de->de_mode = vap->va_mode;
|
|
c = 1;
|
|
}
|
|
|
|
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
|
|
/* See the comment in ufs_vnops::ufs_setattr(). */
|
|
if ((error = VOP_ACCESS(vp, VADMIN, ap->a_cred, ap->a_td)) &&
|
|
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
|
|
(error = VOP_ACCESS(vp, VWRITE, ap->a_cred, ap->a_td))))
|
|
return (error);
|
|
if (vap->va_atime.tv_sec != VNOVAL) {
|
|
if (vp->v_type == VCHR)
|
|
vp->v_rdev->si_atime = vap->va_atime;
|
|
else
|
|
de->de_atime = vap->va_atime;
|
|
}
|
|
if (vap->va_mtime.tv_sec != VNOVAL) {
|
|
if (vp->v_type == VCHR)
|
|
vp->v_rdev->si_mtime = vap->va_mtime;
|
|
else
|
|
de->de_mtime = vap->va_mtime;
|
|
}
|
|
c = 1;
|
|
}
|
|
|
|
if (c) {
|
|
if (vp->v_type == VCHR)
|
|
vfs_timestamp(&vp->v_rdev->si_ctime);
|
|
else
|
|
vfs_timestamp(&de->de_mtime);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifdef MAC
|
|
static int
|
|
devfs_setlabel(ap)
|
|
struct vop_setlabel_args /* {
|
|
struct vnode *a_vp;
|
|
struct mac *a_label;
|
|
struct ucred *a_cred;
|
|
struct thread *a_td;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp;
|
|
struct devfs_dirent *de;
|
|
|
|
vp = ap->a_vp;
|
|
de = vp->v_data;
|
|
|
|
mac_relabel_vnode(ap->a_cred, vp, ap->a_label);
|
|
mac_update_devfsdirent(vp->v_mount, de, vp);
|
|
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
static int doslowdown = 0;
|
|
SYSCTL_INT(_debug, OID_AUTO, doslowdown, CTLFLAG_RW, &doslowdown, 0, "");
|
|
|
|
static int
|
|
devfs_specstrategy(ap)
|
|
struct vop_specstrategy_args /* {
|
|
struct vnode *a_vp;
|
|
struct buf *a_bp;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct buf *bp = ap->a_bp;
|
|
struct mount *mp;
|
|
struct thread *td = curthread;
|
|
|
|
KASSERT(ap->a_vp->v_rdev == ap->a_bp->b_dev,
|
|
("%s, dev %s != %s", __func__,
|
|
devtoname(ap->a_vp->v_rdev),
|
|
devtoname(ap->a_bp->b_dev)));
|
|
KASSERT(bp->b_iocmd == BIO_READ || bp->b_iocmd == BIO_WRITE,
|
|
("Wrong b_iocmd buf=%p cmd=%d", bp, bp->b_iocmd));
|
|
|
|
/*
|
|
* Slow down disk requests for niced processes.
|
|
*/
|
|
if (doslowdown && td && td->td_proc->p_nice > 0) {
|
|
msleep(td, NULL, PPAUSE | PCATCH, "ioslow",
|
|
td->td_proc->p_nice);
|
|
}
|
|
/*
|
|
* Collect statistics on synchronous and asynchronous read
|
|
* and write counts for disks that have associated filesystems.
|
|
*/
|
|
if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) {
|
|
if (bp->b_iocmd == BIO_WRITE) {
|
|
if (bp->b_lock.lk_lockholder == LK_KERNPROC)
|
|
mp->mnt_stat.f_asyncwrites++;
|
|
else
|
|
mp->mnt_stat.f_syncwrites++;
|
|
} else {
|
|
if (bp->b_lock.lk_lockholder == LK_KERNPROC)
|
|
mp->mnt_stat.f_asyncreads++;
|
|
else
|
|
mp->mnt_stat.f_syncreads++;
|
|
}
|
|
}
|
|
|
|
dev_strategy(bp);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
devfs_symlink(ap)
|
|
struct vop_symlink_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode **a_vpp;
|
|
struct componentname *a_cnp;
|
|
struct vattr *a_vap;
|
|
char *a_target;
|
|
} */ *ap;
|
|
{
|
|
int i, error;
|
|
struct devfs_dirent *dd;
|
|
struct devfs_dirent *de;
|
|
struct devfs_mount *dmp;
|
|
struct thread *td;
|
|
|
|
td = ap->a_cnp->cn_thread;
|
|
KASSERT(td == curthread, ("devfs_symlink: td != curthread"));
|
|
error = suser(td);
|
|
if (error)
|
|
return(error);
|
|
dmp = VFSTODEVFS(ap->a_dvp->v_mount);
|
|
dd = ap->a_dvp->v_data;
|
|
de = devfs_newdirent(ap->a_cnp->cn_nameptr, ap->a_cnp->cn_namelen);
|
|
de->de_uid = 0;
|
|
de->de_gid = 0;
|
|
de->de_mode = 0755;
|
|
de->de_inode = dmp->dm_inode++;
|
|
de->de_dirent->d_type = DT_LNK;
|
|
i = strlen(ap->a_target) + 1;
|
|
MALLOC(de->de_symlink, char *, i, M_DEVFS, M_WAITOK);
|
|
bcopy(ap->a_target, de->de_symlink, i);
|
|
lockmgr(&dmp->dm_lock, LK_EXCLUSIVE, 0, td);
|
|
#ifdef MAC
|
|
mac_create_devfs_symlink(ap->a_cnp->cn_cred, dmp->dm_mount, dd, de);
|
|
#endif
|
|
TAILQ_INSERT_TAIL(&dd->de_dlist, de, de_list);
|
|
devfs_allocv(de, ap->a_dvp->v_mount, ap->a_vpp, td);
|
|
lockmgr(&dmp->dm_lock, LK_RELEASE, 0, td);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for write
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
devfs_write(ap)
|
|
struct vop_write_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
int a_ioflag;
|
|
struct ucred *a_cred;
|
|
} */ *ap;
|
|
{
|
|
struct vnode *vp;
|
|
struct thread *td;
|
|
struct uio *uio;
|
|
struct cdev *dev;
|
|
int error, resid;
|
|
struct cdevsw *dsw;
|
|
|
|
vp = ap->a_vp;
|
|
dev = vp->v_rdev;
|
|
uio = ap->a_uio;
|
|
td = uio->uio_td;
|
|
resid = uio->uio_resid;
|
|
|
|
dsw = dev_refthread(dev);
|
|
if (dsw == NULL)
|
|
return (ENXIO);
|
|
VOP_UNLOCK(vp, 0, td);
|
|
KASSERT(dev->si_refcount > 0,
|
|
("devfs_write() on un-referenced struct cdev *(%s)",
|
|
devtoname(dev)));
|
|
if (!(dsw->d_flags & D_NEEDGIANT)) {
|
|
DROP_GIANT();
|
|
error = dsw->d_write(dev, uio, ap->a_ioflag);
|
|
PICKUP_GIANT();
|
|
} else
|
|
error = dsw->d_write(dev, uio, ap->a_ioflag);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
|
|
dev_relthread(dev);
|
|
if (uio->uio_resid != resid || (error == 0 && resid != 0)) {
|
|
vfs_timestamp(&dev->si_ctime);
|
|
dev->si_mtime = dev->si_ctime;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
|
|
static struct vnodeopv_entry_desc devfs_vnodeop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *) vop_defaultop },
|
|
{ &vop_access_desc, (vop_t *) devfs_access },
|
|
{ &vop_getattr_desc, (vop_t *) devfs_getattr },
|
|
{ &vop_ioctl_desc, (vop_t *) devfs_rioctl },
|
|
{ &vop_lookup_desc, (vop_t *) devfs_lookup },
|
|
{ &vop_mknod_desc, (vop_t *) devfs_mknod },
|
|
{ &vop_pathconf_desc, (vop_t *) devfs_pathconf },
|
|
{ &vop_read_desc, (vop_t *) devfs_rread },
|
|
{ &vop_readdir_desc, (vop_t *) devfs_readdir },
|
|
{ &vop_readlink_desc, (vop_t *) devfs_readlink },
|
|
{ &vop_reclaim_desc, (vop_t *) devfs_reclaim },
|
|
{ &vop_remove_desc, (vop_t *) devfs_remove },
|
|
{ &vop_revoke_desc, (vop_t *) devfs_revoke },
|
|
{ &vop_setattr_desc, (vop_t *) devfs_setattr },
|
|
#ifdef MAC
|
|
{ &vop_setlabel_desc, (vop_t *) devfs_setlabel },
|
|
#endif
|
|
{ &vop_symlink_desc, (vop_t *) devfs_symlink },
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
static struct vnodeopv_desc devfs_vnodeop_opv_desc =
|
|
{ &devfs_vnodeop_p, devfs_vnodeop_entries };
|
|
|
|
VNODEOP_SET(devfs_vnodeop_opv_desc);
|
|
|
|
static struct vnodeopv_entry_desc devfs_specop_entries[] = {
|
|
{ &vop_default_desc, (vop_t *) vop_defaultop },
|
|
{ &vop_access_desc, (vop_t *) devfs_access },
|
|
{ &vop_advlock_desc, (vop_t *) devfs_advlock },
|
|
{ &vop_bmap_desc, (vop_t *) vop_panic },
|
|
{ &vop_close_desc, (vop_t *) devfs_close },
|
|
{ &vop_create_desc, (vop_t *) vop_panic },
|
|
{ &vop_fsync_desc, (vop_t *) devfs_fsync },
|
|
{ &vop_getattr_desc, (vop_t *) devfs_getattr },
|
|
{ &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount },
|
|
{ &vop_ioctl_desc, (vop_t *) devfs_ioctl },
|
|
{ &vop_kqfilter_desc, (vop_t *) devfs_kqfilter },
|
|
{ &vop_lease_desc, (vop_t *) vop_null },
|
|
{ &vop_link_desc, (vop_t *) vop_panic },
|
|
{ &vop_mkdir_desc, (vop_t *) vop_panic },
|
|
{ &vop_mknod_desc, (vop_t *) vop_panic },
|
|
{ &vop_open_desc, (vop_t *) devfs_open },
|
|
{ &vop_pathconf_desc, (vop_t *) devfs_pathconf },
|
|
{ &vop_poll_desc, (vop_t *) devfs_poll },
|
|
{ &vop_print_desc, (vop_t *) devfs_print },
|
|
{ &vop_read_desc, (vop_t *) devfs_read },
|
|
{ &vop_readdir_desc, (vop_t *) vop_panic },
|
|
{ &vop_readlink_desc, (vop_t *) vop_panic },
|
|
{ &vop_reallocblks_desc, (vop_t *) vop_panic },
|
|
{ &vop_reclaim_desc, (vop_t *) devfs_reclaim },
|
|
{ &vop_remove_desc, (vop_t *) devfs_remove },
|
|
{ &vop_rename_desc, (vop_t *) vop_panic },
|
|
{ &vop_revoke_desc, (vop_t *) devfs_revoke },
|
|
{ &vop_rmdir_desc, (vop_t *) vop_panic },
|
|
{ &vop_setattr_desc, (vop_t *) devfs_setattr },
|
|
#ifdef MAC
|
|
{ &vop_setlabel_desc, (vop_t *) devfs_setlabel },
|
|
#endif
|
|
{ &vop_specstrategy_desc, (vop_t *) devfs_specstrategy },
|
|
{ &vop_strategy_desc, (vop_t *) vop_panic },
|
|
{ &vop_symlink_desc, (vop_t *) vop_panic },
|
|
{ &vop_write_desc, (vop_t *) devfs_write },
|
|
{ NULL, NULL }
|
|
};
|
|
|
|
static struct vnodeopv_desc devfs_specop_opv_desc =
|
|
{ &devfs_specop_p, devfs_specop_entries };
|
|
|
|
VNODEOP_SET(devfs_specop_opv_desc);
|