806 lines
19 KiB
C
806 lines
19 KiB
C
/* $NetBSD: kernfs_vnops.c,v 1.43 1996/03/16 23:52:47 christos Exp $ */
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/*
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* Copyright (c) 1992, 1993
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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. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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 8.9 (Berkeley) 6/15/94
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*/
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/*
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* Kernel parameter filesystem (/kern)
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/vmmeter.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <sys/namei.h>
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#include <sys/buf.h>
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#include <sys/dirent.h>
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#include <sys/msgbuf.h>
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#include <miscfs/kernfs/kernfs.h>
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#define KSTRING 256 /* Largest I/O available via this filesystem */
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#define UIO_MX 32
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#define READ_MODE (S_IRUSR|S_IRGRP|S_IROTH)
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#define WRITE_MODE (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH)
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#define DIR_MODE (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
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struct kern_target {
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u_char kt_type;
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u_char kt_namlen;
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char *kt_name;
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void *kt_data;
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#define KTT_NULL 1
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#define KTT_TIME 5
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#define KTT_INT 17
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#define KTT_STRING 31
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#define KTT_HOSTNAME 47
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#define KTT_AVENRUN 53
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#define KTT_DEVICE 71
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#define KTT_MSGBUF 89
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u_char kt_tag;
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u_char kt_vtype;
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mode_t kt_mode;
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} kern_targets[] = {
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/* NOTE: The name must be less than UIO_MX-16 chars in length */
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#define N(s) sizeof(s)-1, s
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/* name data tag type ro/rw */
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{ DT_DIR, N("."), 0, KTT_NULL, VDIR, DIR_MODE },
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{ DT_DIR, N(".."), 0, KTT_NULL, VDIR, DIR_MODE },
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{ DT_REG, N("boottime"), &boottime.tv_sec, KTT_INT, VREG, READ_MODE },
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{ DT_REG, N("copyright"), copyright, KTT_STRING, VREG, READ_MODE },
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{ DT_REG, N("hostname"), 0, KTT_HOSTNAME, VREG, WRITE_MODE },
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{ DT_REG, N("hz"), &hz, KTT_INT, VREG, READ_MODE },
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{ DT_REG, N("loadavg"), 0, KTT_AVENRUN, VREG, READ_MODE },
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{ DT_REG, N("msgbuf"), 0, KTT_MSGBUF, VREG, READ_MODE },
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{ DT_REG, N("pagesize"), &cnt.v_page_size, KTT_INT, VREG, READ_MODE },
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{ DT_REG, N("physmem"), &physmem, KTT_INT, VREG, READ_MODE },
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#if 0
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{ DT_DIR, N("root"), 0, KTT_NULL, VDIR, DIR_MODE },
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#endif
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{ DT_BLK, N("rootdev"), &rootdev, KTT_DEVICE, VBLK, READ_MODE },
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{ DT_CHR, N("rrootdev"), &rrootdev, KTT_DEVICE, VCHR, READ_MODE },
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{ DT_REG, N("time"), 0, KTT_TIME, VREG, READ_MODE },
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{ DT_REG, N("version"), version, KTT_STRING, VREG, READ_MODE },
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#undef N
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};
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static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]);
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int kernfs_badop __P((void *));
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int kernfs_enotsupp __P((void *));
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int kernfs_lookup __P((void *));
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#define kernfs_create kernfs_enotsupp
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#define kernfs_mknod kernfs_enotsupp
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int kernfs_open __P((void *));
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#define kernfs_close nullop
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int kernfs_access __P((void *));
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int kernfs_getattr __P((void *));
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int kernfs_setattr __P((void *));
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int kernfs_read __P((void *));
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int kernfs_write __P((void *));
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#define kernfs_ioctl kernfs_enotsupp
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#define kernfs_select kernfs_enotsupp
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#define kernfs_mmap kernfs_enotsupp
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#define kernfs_fsync nullop
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#define kernfs_seek nullop
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#define kernfs_remove kernfs_enotsupp
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int kernfs_link __P((void *));
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#define kernfs_rename kernfs_enotsupp
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#define kernfs_mkdir kernfs_enotsupp
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#define kernfs_rmdir kernfs_enotsupp
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int kernfs_symlink __P((void *));
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int kernfs_readdir __P((void *));
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#define kernfs_readlink kernfs_enotsupp
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int kernfs_abortop __P((void *));
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int kernfs_inactive __P((void *));
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int kernfs_reclaim __P((void *));
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#define kernfs_lock nullop
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#define kernfs_unlock nullop
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#define kernfs_bmap kernfs_badop
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#define kernfs_strategy kernfs_badop
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int kernfs_print __P((void *));
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#define kernfs_islocked nullop
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int kernfs_pathconf __P((void *));
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#define kernfs_advlock kernfs_enotsupp
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#define kernfs_blkatoff kernfs_enotsupp
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#define kernfs_valloc kernfs_enotsupp
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int kernfs_vfree __P((void *));
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#define kernfs_truncate kernfs_enotsupp
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#define kernfs_update kernfs_enotsupp
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#define kernfs_bwrite kernfs_enotsupp
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int kernfs_xread __P((struct kern_target *, int, char **, int));
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int kernfs_xwrite __P((struct kern_target *, char *, int));
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int (**kernfs_vnodeop_p) __P((void *));
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struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = {
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{ &vop_default_desc, vn_default_error },
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{ &vop_lookup_desc, kernfs_lookup }, /* lookup */
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{ &vop_create_desc, kernfs_create }, /* create */
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{ &vop_mknod_desc, kernfs_mknod }, /* mknod */
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{ &vop_open_desc, kernfs_open }, /* open */
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{ &vop_close_desc, kernfs_close }, /* close */
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{ &vop_access_desc, kernfs_access }, /* access */
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{ &vop_getattr_desc, kernfs_getattr }, /* getattr */
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{ &vop_setattr_desc, kernfs_setattr }, /* setattr */
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{ &vop_read_desc, kernfs_read }, /* read */
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{ &vop_write_desc, kernfs_write }, /* write */
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{ &vop_ioctl_desc, kernfs_ioctl }, /* ioctl */
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{ &vop_select_desc, kernfs_select }, /* select */
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{ &vop_mmap_desc, kernfs_mmap }, /* mmap */
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{ &vop_fsync_desc, kernfs_fsync }, /* fsync */
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{ &vop_seek_desc, kernfs_seek }, /* seek */
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{ &vop_remove_desc, kernfs_remove }, /* remove */
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{ &vop_link_desc, kernfs_link }, /* link */
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{ &vop_rename_desc, kernfs_rename }, /* rename */
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{ &vop_mkdir_desc, kernfs_mkdir }, /* mkdir */
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{ &vop_rmdir_desc, kernfs_rmdir }, /* rmdir */
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{ &vop_symlink_desc, kernfs_symlink }, /* symlink */
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{ &vop_readdir_desc, kernfs_readdir }, /* readdir */
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{ &vop_readlink_desc, kernfs_readlink },/* readlink */
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{ &vop_abortop_desc, kernfs_abortop }, /* abortop */
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{ &vop_inactive_desc, kernfs_inactive },/* inactive */
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{ &vop_reclaim_desc, kernfs_reclaim }, /* reclaim */
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{ &vop_lock_desc, kernfs_lock }, /* lock */
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{ &vop_unlock_desc, kernfs_unlock }, /* unlock */
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{ &vop_bmap_desc, kernfs_bmap }, /* bmap */
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{ &vop_strategy_desc, kernfs_strategy },/* strategy */
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{ &vop_print_desc, kernfs_print }, /* print */
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{ &vop_islocked_desc, kernfs_islocked },/* islocked */
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{ &vop_pathconf_desc, kernfs_pathconf },/* pathconf */
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{ &vop_advlock_desc, kernfs_advlock }, /* advlock */
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{ &vop_blkatoff_desc, kernfs_blkatoff },/* blkatoff */
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{ &vop_valloc_desc, kernfs_valloc }, /* valloc */
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{ &vop_vfree_desc, kernfs_vfree }, /* vfree */
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{ &vop_truncate_desc, kernfs_truncate },/* truncate */
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{ &vop_update_desc, kernfs_update }, /* update */
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{ &vop_bwrite_desc, kernfs_bwrite }, /* bwrite */
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{ (struct vnodeop_desc*)NULL, (int(*) __P((void *)))NULL }
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};
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struct vnodeopv_desc kernfs_vnodeop_opv_desc =
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{ &kernfs_vnodeop_p, kernfs_vnodeop_entries };
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int
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kernfs_xread(kt, off, bufp, len)
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struct kern_target *kt;
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int off;
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char **bufp;
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int len;
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{
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switch (kt->kt_tag) {
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case KTT_TIME: {
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struct timeval tv;
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microtime(&tv);
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sprintf(*bufp, "%ld %ld\n", tv.tv_sec, tv.tv_usec);
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break;
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}
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case KTT_INT: {
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int *ip = kt->kt_data;
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sprintf(*bufp, "%d\n", *ip);
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break;
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}
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case KTT_STRING: {
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char *cp = kt->kt_data;
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*bufp = cp;
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break;
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}
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case KTT_MSGBUF: {
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extern struct msgbuf *msgbufp;
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long n;
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if (off >= MSG_BSIZE)
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return (0);
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n = msgbufp->msg_bufx + off;
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if (n >= MSG_BSIZE)
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n -= MSG_BSIZE;
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len = min(MSG_BSIZE - n, MSG_BSIZE - off);
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*bufp = msgbufp->msg_bufc + n;
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return (len);
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}
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case KTT_HOSTNAME: {
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char *cp = hostname;
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int xlen = hostnamelen;
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if (xlen >= (len-2))
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return (EINVAL);
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bcopy(cp, *bufp, xlen);
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(*bufp)[xlen] = '\n';
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(*bufp)[xlen+1] = '\0';
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break;
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}
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case KTT_AVENRUN:
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averunnable.fscale = FSCALE;
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sprintf(*bufp, "%d %d %d %ld\n",
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averunnable.ldavg[0], averunnable.ldavg[1],
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averunnable.ldavg[2], averunnable.fscale);
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break;
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default:
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return (0);
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}
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len = strlen(*bufp);
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if (len <= off)
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return (0);
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*bufp += off;
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return (len - off);
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}
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int
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kernfs_xwrite(kt, buf, len)
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struct kern_target *kt;
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char *buf;
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int len;
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{
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switch (kt->kt_tag) {
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case KTT_HOSTNAME:
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if (buf[len-1] == '\n')
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--len;
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bcopy(buf, hostname, len);
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hostname[len] = '\0';
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hostnamelen = len;
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return (0);
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default:
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return (EIO);
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}
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}
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/*
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* vp is the current namei directory
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* ndp is the name to locate in that directory...
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*/
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int
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kernfs_lookup(v)
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void *v;
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{
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struct vop_lookup_args /* {
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struct vnode * a_dvp;
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struct vnode ** a_vpp;
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struct componentname * a_cnp;
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} */ *ap = v;
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struct componentname *cnp = ap->a_cnp;
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struct vnode **vpp = ap->a_vpp;
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struct vnode *dvp = ap->a_dvp;
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char *pname = cnp->cn_nameptr;
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struct kern_target *kt;
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struct vnode *fvp;
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int error, i;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup(%x)\n", ap);
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printf("kernfs_lookup(dp = %x, vpp = %x, cnp = %x)\n", dvp, vpp, ap->a_cnp);
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printf("kernfs_lookup(%s)\n", pname);
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#endif
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*vpp = NULLVP;
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if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
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return (EROFS);
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if (cnp->cn_namelen == 1 && *pname == '.') {
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*vpp = dvp;
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VREF(dvp);
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/*VOP_LOCK(dvp);*/
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return (0);
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}
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#if 0
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if (cnp->cn_namelen == 4 && bcmp(pname, "root", 4) == 0) {
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*vpp = rootdir;
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VREF(rootdir);
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VOP_LOCK(rootdir);
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return (0);
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}
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#endif
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for (kt = kern_targets, i = 0; i < nkern_targets; kt++, i++) {
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if (cnp->cn_namelen == kt->kt_namlen &&
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bcmp(kt->kt_name, pname, cnp->cn_namelen) == 0)
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goto found;
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}
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup: i = %d, failed", i);
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#endif
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return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);
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found:
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if (kt->kt_tag == KTT_DEVICE) {
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dev_t *dp = kt->kt_data;
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loop:
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if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp))
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return (ENOENT);
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*vpp = fvp;
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if (vget(fvp, 1))
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goto loop;
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return (0);
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}
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup: allocate new vnode\n");
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#endif
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error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p, &fvp);
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if (error)
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return (error);
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MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP,
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M_WAITOK);
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VTOKERN(fvp)->kf_kt = kt;
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fvp->v_type = kt->kt_vtype;
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*vpp = fvp;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup: newvp = %x\n", fvp);
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#endif
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return (0);
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}
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/*ARGSUSED*/
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int
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kernfs_open(v)
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void *v;
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{
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/* Only need to check access permissions. */
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return (0);
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}
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int
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kernfs_access(v)
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void *v;
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{
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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 proc *a_p;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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mode_t fmode =
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(vp->v_flag & VROOT) ? DIR_MODE : VTOKERN(vp)->kf_kt->kt_mode;
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return (vaccess(fmode, (uid_t)0, (gid_t)0, ap->a_mode, ap->a_cred));
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}
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int
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kernfs_getattr(v)
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void *v;
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{
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struct vop_getattr_args /* {
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struct vnode *a_vp;
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struct vattr *a_vap;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap = v;
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struct vnode *vp = ap->a_vp;
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struct vattr *vap = ap->a_vap;
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struct timeval tv;
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int error = 0;
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char strbuf[KSTRING], *buf;
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bzero((caddr_t) vap, sizeof(*vap));
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vattr_null(vap);
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vap->va_uid = 0;
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vap->va_gid = 0;
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vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
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vap->va_size = 0;
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vap->va_blocksize = DEV_BSIZE;
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microtime(&tv);
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TIMEVAL_TO_TIMESPEC(&tv, &vap->va_atime);
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vap->va_mtime = vap->va_atime;
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vap->va_ctime = vap->va_ctime;
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vap->va_gen = 0;
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vap->va_flags = 0;
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vap->va_rdev = 0;
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vap->va_bytes = 0;
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if (vp->v_flag & VROOT) {
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_getattr: stat rootdir\n");
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#endif
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vap->va_type = VDIR;
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vap->va_mode = DIR_MODE;
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vap->va_nlink = 2;
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vap->va_fileid = 2;
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vap->va_size = DEV_BSIZE;
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} else {
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struct kern_target *kt = VTOKERN(vp)->kf_kt;
|
|
int nbytes, total;
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_getattr: stat target %s\n", kt->kt_name);
|
|
#endif
|
|
vap->va_type = kt->kt_vtype;
|
|
vap->va_mode = kt->kt_mode;
|
|
vap->va_nlink = 1;
|
|
vap->va_fileid = 3 + (kt - kern_targets);
|
|
total = 0;
|
|
while (buf = strbuf,
|
|
nbytes = kernfs_xread(kt, total, &buf, sizeof(strbuf)))
|
|
total += nbytes;
|
|
vap->va_size = total;
|
|
}
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_getattr: return error %d\n", error);
|
|
#endif
|
|
return (error);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
kernfs_setattr(v)
|
|
void *v;
|
|
{
|
|
/*
|
|
* Silently ignore attribute changes.
|
|
* This allows for open with truncate to have no
|
|
* effect until some data is written. I want to
|
|
* do it this way because all writes are atomic.
|
|
*/
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_read(v)
|
|
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 uio *uio = ap->a_uio;
|
|
struct kern_target *kt;
|
|
char strbuf[KSTRING], *buf;
|
|
int off, len;
|
|
int error;
|
|
|
|
if (vp->v_type == VDIR)
|
|
return (EOPNOTSUPP);
|
|
|
|
kt = VTOKERN(vp)->kf_kt;
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kern_read %s\n", kt->kt_name);
|
|
#endif
|
|
|
|
off = uio->uio_offset;
|
|
#if 0
|
|
while (buf = strbuf,
|
|
#else
|
|
if (buf = strbuf,
|
|
#endif
|
|
len = kernfs_xread(kt, off, &buf, sizeof(strbuf))) {
|
|
if ((error = uiomove(buf, len, uio)) != 0)
|
|
return (error);
|
|
off += len;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_write(v)
|
|
void *v;
|
|
{
|
|
struct vop_write_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 uio *uio = ap->a_uio;
|
|
struct kern_target *kt;
|
|
int error, xlen;
|
|
char strbuf[KSTRING];
|
|
|
|
if (vp->v_type == VDIR)
|
|
return (EOPNOTSUPP);
|
|
|
|
kt = VTOKERN(vp)->kf_kt;
|
|
|
|
if (uio->uio_offset != 0)
|
|
return (EINVAL);
|
|
|
|
xlen = min(uio->uio_resid, KSTRING-1);
|
|
if ((error = uiomove(strbuf, xlen, uio)) != 0)
|
|
return (error);
|
|
|
|
if (uio->uio_resid != 0)
|
|
return (EIO);
|
|
|
|
strbuf[xlen] = '\0';
|
|
xlen = strlen(strbuf);
|
|
return (kernfs_xwrite(kt, strbuf, xlen));
|
|
}
|
|
|
|
int
|
|
kernfs_readdir(v)
|
|
void *v;
|
|
{
|
|
struct vop_readdir_args /* {
|
|
struct vnode *a_vp;
|
|
struct uio *a_uio;
|
|
struct ucred *a_cred;
|
|
int *a_eofflag;
|
|
u_long *a_cookies;
|
|
int a_ncookies;
|
|
} */ *ap = v;
|
|
struct uio *uio = ap->a_uio;
|
|
struct dirent d;
|
|
struct kern_target *kt;
|
|
int i;
|
|
int error;
|
|
u_long *cookies = ap->a_cookies;
|
|
int ncookies = ap->a_ncookies;
|
|
|
|
if (ap->a_vp->v_type != VDIR)
|
|
return (ENOTDIR);
|
|
|
|
if (uio->uio_resid < UIO_MX)
|
|
return (EINVAL);
|
|
if (uio->uio_offset < 0)
|
|
return (EINVAL);
|
|
|
|
error = 0;
|
|
i = uio->uio_offset;
|
|
bzero((caddr_t)&d, UIO_MX);
|
|
d.d_reclen = UIO_MX;
|
|
|
|
for (kt = &kern_targets[i];
|
|
uio->uio_resid >= UIO_MX && i < nkern_targets; kt++, i++) {
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_readdir: i = %d\n", i);
|
|
#endif
|
|
|
|
if (kt->kt_tag == KTT_DEVICE) {
|
|
dev_t *dp = kt->kt_data;
|
|
struct vnode *fvp;
|
|
|
|
if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp))
|
|
continue;
|
|
}
|
|
|
|
d.d_fileno = i + 3;
|
|
d.d_namlen = kt->kt_namlen;
|
|
bcopy(kt->kt_name, d.d_name, kt->kt_namlen + 1);
|
|
d.d_type = kt->kt_type;
|
|
|
|
if ((error = uiomove((caddr_t)&d, UIO_MX, uio)) != 0)
|
|
break;
|
|
if (ncookies-- > 0)
|
|
*cookies++ = i + 1;
|
|
}
|
|
|
|
uio->uio_offset = i;
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kernfs_inactive(v)
|
|
void *v;
|
|
{
|
|
struct vop_inactive_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_inactive(%x)\n", vp);
|
|
#endif
|
|
/*
|
|
* Clear out the v_type field to avoid
|
|
* nasty things happening in vgone().
|
|
*/
|
|
vp->v_type = VNON;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_reclaim(v)
|
|
void *v;
|
|
{
|
|
struct vop_reclaim_args /* {
|
|
struct vnode *a_vp;
|
|
} */ *ap = v;
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
#ifdef KERNFS_DIAGNOSTIC
|
|
printf("kernfs_reclaim(%x)\n", vp);
|
|
#endif
|
|
if (vp->v_data) {
|
|
FREE(vp->v_data, M_TEMP);
|
|
vp->v_data = 0;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to special devices.
|
|
*/
|
|
int
|
|
kernfs_pathconf(v)
|
|
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);
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of a /dev/fd vnode.
|
|
*/
|
|
/* ARGSUSED */
|
|
int
|
|
kernfs_print(v)
|
|
void *v;
|
|
{
|
|
|
|
printf("tag VT_KERNFS, kernfs vnode\n");
|
|
return (0);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
kernfs_vfree(v)
|
|
void *v;
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
kernfs_link(v)
|
|
void *v;
|
|
{
|
|
struct vop_link_args /* {
|
|
struct vnode *a_dvp;
|
|
struct vnode *a_vp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap = v;
|
|
|
|
VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
|
|
vput(ap->a_dvp);
|
|
return (EROFS);
|
|
}
|
|
|
|
int
|
|
kernfs_symlink(v)
|
|
void *v;
|
|
{
|
|
struct vop_symlink_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);
|
|
vput(ap->a_dvp);
|
|
return (EROFS);
|
|
}
|
|
|
|
int
|
|
kernfs_abortop(v)
|
|
void *v;
|
|
{
|
|
struct vop_abortop_args /* {
|
|
struct vnode *a_dvp;
|
|
struct componentname *a_cnp;
|
|
} */ *ap = v;
|
|
|
|
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
|
|
FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* /dev/fd vnode unsupported operation
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
kernfs_enotsupp(v)
|
|
void *v;
|
|
{
|
|
|
|
return (EOPNOTSUPP);
|
|
}
|
|
|
|
/*
|
|
* /dev/fd "should never get here" operation
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
kernfs_badop(v)
|
|
void *v;
|
|
{
|
|
|
|
panic("kernfs: bad op");
|
|
return 0;
|
|
}
|