477 lines
11 KiB
C
477 lines
11 KiB
C
/*-
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* Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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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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* in this position and unchanged.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/ctype.h>
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#include <sys/dirent.h>
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#include <sys/lock.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/sbuf.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/vnode.h>
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#include <fs/pseudofs/pseudofs.h>
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#include <fs/pseudofs/pseudofs_internal.h>
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/*
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* Verify permissions
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*/
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static int
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pfs_access(struct vop_access_args *va)
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{
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struct vnode *vn = va->a_vp;
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struct vattr vattr;
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int error;
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error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_p);
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if (error)
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return (error);
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error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid,
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vattr.va_gid, va->a_mode, va->a_cred, NULL);
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return (error);
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}
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/*
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* Close a file or directory
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*/
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static int
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pfs_close(struct vop_close_args *va)
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{
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return (0);
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}
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/*
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* Get file attributes
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*/
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static int
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pfs_getattr(struct vop_getattr_args *va)
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{
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struct vnode *vn = va->a_vp;
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struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
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struct pfs_node *pn = pvd->pvd_pn;
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struct vattr *vap = va->a_vap;
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VATTR_NULL(vap);
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vap->va_type = vn->v_type;
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vap->va_mode = pn->pn_mode;
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vap->va_fileid = pn->pn_fileno;
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vap->va_flags = 0;
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vap->va_blocksize = PAGE_SIZE;
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vap->va_bytes = vap->va_size = 0;
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vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0];
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vap->va_nlink = 1;
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nanotime(&vap->va_ctime);
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vap->va_atime = vap->va_mtime = vap->va_ctime;
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vap->va_uid = pn->pn_uid;
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vap->va_gid = pn->pn_gid;
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return (0);
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}
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/*
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* Look up a file or directory
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*/
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static int
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pfs_lookup(struct vop_lookup_args *va)
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{
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struct vnode *vn = va->a_dvp;
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struct vnode **vpp = va->a_vpp;
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struct componentname *cnp = va->a_cnp;
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struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
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struct pfs_node *pd = pvd->pvd_pn;
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struct pfs_node *pn, *pdn = NULL;
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pid_t pid = pvd->pvd_pid;
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char *pname;
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int error, i, namelen;
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if (vn->v_type != VDIR)
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return (ENOTDIR);
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/* don't support CREATE, RENAME or DELETE */
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if (cnp->cn_nameiop != LOOKUP)
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return (EROFS);
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/* shortcut */
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if (cnp->cn_namelen >= PFS_NAMELEN)
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return (ENOENT);
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/* self */
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namelen = cnp->cn_namelen;
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pname = cnp->cn_nameptr;
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if (namelen == 1 && *pname == '.') {
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pn = pd;
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*vpp = vn;
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VREF(vn);
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goto got_vnode;
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}
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/* parent */
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if (cnp->cn_flags & ISDOTDOT) {
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if (pd->pn_type == pfstype_root)
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return (EIO);
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KASSERT(pd->pn_parent, ("non-root directory has no parent"));
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/*
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* This one is tricky. Descendents of procdir nodes
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* inherit their parent's process affinity, but
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* there's no easy reverse mapping. For simplicity,
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* we assume that if this node is a procdir, its
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* parent isn't (which is correct as long as
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* descendents of procdir nodes are never procdir
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* nodes themselves)
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*/
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if (pd->pn_type == pfstype_procdir)
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pid = NO_PID;
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return pfs_vncache_alloc(vn->v_mount, vpp, pd->pn_parent, pid);
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}
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/* named node */
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for (pn = pd->pn_nodes; pn->pn_type; ++pn)
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if (pn->pn_type == pfstype_procdir)
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pdn = pn;
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else if (pn->pn_name[namelen] == '\0'
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&& bcmp(pname, pn->pn_name, namelen) == 0)
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goto got_pnode;
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/* process dependent node */
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if ((pn = pdn) != NULL) {
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pid = 0;
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for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i)
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if ((pid = pid * 10 + pname[i] - '0') > PID_MAX)
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break;
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if (i == cnp->cn_namelen)
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goto got_pnode;
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}
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return (ENOENT);
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got_pnode:
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if (!pn->pn_parent)
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pn->pn_parent = pd;
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error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid);
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if (error)
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return error;
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got_vnode:
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if (cnp->cn_flags & MAKEENTRY)
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cache_enter(vn, *vpp, cnp);
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return (0);
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}
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/*
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* Open a file or directory.
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*/
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static int
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pfs_open(struct vop_open_args *va)
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{
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/* XXX */
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return (0);
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}
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/*
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* Read from a file
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*/
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static int
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pfs_read(struct vop_read_args *va)
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{
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struct vnode *vn = va->a_vp;
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struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
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struct pfs_node *pn = pvd->pvd_pn;
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struct uio *uio = va->a_uio;
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struct proc *proc = NULL;
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struct sbuf *sb = NULL;
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char *ps;
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int error, xlen;
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if (vn->v_type != VREG)
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return (EINVAL);
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if (pvd->pvd_pid != NO_PID) {
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if ((proc = pfind(pvd->pvd_pid)) == NULL)
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return (EIO);
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_PHOLD(proc);
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PROC_UNLOCK(proc);
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}
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sb = sbuf_new(sb, NULL, uio->uio_offset + uio->uio_resid, 0);
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if (sb == NULL) {
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if (proc != NULL)
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PRELE(proc);
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return (EIO);
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}
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error = (pn->pn_func)(curproc, proc, pn, sb);
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if (proc != NULL)
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PRELE(proc);
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if (error) {
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sbuf_delete(sb);
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return (error);
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}
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/* XXX we should possibly detect and handle overflows */
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sbuf_finish(sb);
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ps = sbuf_data(sb) + uio->uio_offset;
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xlen = sbuf_len(sb) - uio->uio_offset;
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xlen = imin(xlen, uio->uio_resid);
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error = (xlen <= 0 ? 0 : uiomove(ps, xlen, uio));
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sbuf_delete(sb);
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return (error);
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}
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/*
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* Iterate through directory entries
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*/
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static int
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pfs_iterate(struct pfs_info *pi, struct pfs_node **pn, struct proc **p)
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{
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if ((*pn)->pn_type == pfstype_none)
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return (-1);
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if ((*pn)->pn_type != pfstype_procdir)
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++*pn;
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while ((*pn)->pn_type == pfstype_procdir) {
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if (*p == NULL)
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*p = LIST_FIRST(&allproc);
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else
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*p = LIST_NEXT(*p, p_list);
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if (*p != NULL)
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return (0);
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++*pn;
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}
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if ((*pn)->pn_type == pfstype_none)
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return (-1);
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return (0);
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}
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/*
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* Return directory entries.
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*/
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static int
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pfs_readdir(struct vop_readdir_args *va)
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{
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struct vnode *vn = va->a_vp;
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struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data;
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struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
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struct pfs_node *pd = pvd->pvd_pn;
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struct pfs_node *pn;
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struct dirent entry;
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struct uio *uio;
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struct proc *p;
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off_t offset;
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int error, i, resid;
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if (vn->v_type != VDIR)
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return (ENOTDIR);
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uio = va->a_uio;
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/* only allow reading entire entries */
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offset = uio->uio_offset;
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resid = uio->uio_resid;
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if (offset < 0 || offset % PFS_DELEN != 0 || resid < PFS_DELEN)
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return (EINVAL);
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/* skip unwanted entries */
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sx_slock(&allproc_lock);
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for (pn = pd->pn_nodes, p = NULL; offset > 0; offset -= PFS_DELEN)
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if (pfs_iterate(pi, &pn, &p) == -1)
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break;
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/* fill in entries */
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entry.d_reclen = PFS_DELEN;
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while (pfs_iterate(pi, &pn, &p) != -1 && resid > 0) {
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if (!pn->pn_parent)
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pn->pn_parent = pd;
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if (!pn->pn_fileno)
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pfs_fileno_alloc(pi, pn);
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if (pvd->pvd_pid != NO_PID)
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entry.d_fileno = pn->pn_fileno * NO_PID + pvd->pvd_pid;
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else
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entry.d_fileno = pn->pn_fileno;
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/* PFS_DELEN was picked to fit PFS_NAMLEN */
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for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i)
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entry.d_name[i] = pn->pn_name[i];
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entry.d_name[i] = 0;
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entry.d_namlen = i;
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switch (pn->pn_type) {
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case pfstype_procdir:
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KASSERT(p != NULL,
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("reached procdir node with p == NULL"));
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entry.d_fileno = pn->pn_fileno * NO_PID + p->p_pid;
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entry.d_namlen = snprintf(entry.d_name,
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PFS_NAMELEN, "%d", p->p_pid);
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/* fall through */
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case pfstype_root:
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case pfstype_dir:
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case pfstype_this:
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case pfstype_parent:
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entry.d_type = DT_DIR;
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break;
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case pfstype_file:
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entry.d_type = DT_REG;
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break;
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case pfstype_symlink:
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entry.d_type = DT_LNK;
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break;
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default:
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sx_sunlock(&allproc_lock);
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panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type);
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}
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if ((error = uiomove((caddr_t)&entry, PFS_DELEN, uio))) {
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sx_sunlock(&allproc_lock);
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return (error);
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}
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offset += PFS_DELEN;
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resid -= PFS_DELEN;
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}
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sx_sunlock(&allproc_lock);
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uio->uio_offset += offset;
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return (0);
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}
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/*
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* Read a symbolic link
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*/
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static int
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pfs_readlink(struct vop_readlink_args *va)
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{
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struct vnode *vn = va->a_vp;
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struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
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struct pfs_node *pn = pvd->pvd_pn;
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struct uio *uio = va->a_uio;
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struct proc *proc = NULL;
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char buf[MAXPATHLEN], *ps;
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struct sbuf sb;
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int error, xlen;
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if (vn->v_type != VLNK)
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return (EINVAL);
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if (pvd->pvd_pid != NO_PID) {
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if ((proc = pfind(pvd->pvd_pid)) == NULL)
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return (EIO);
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_PHOLD(proc);
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PROC_UNLOCK(proc);
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}
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/* sbuf_new() can't fail with a static buffer */
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sbuf_new(&sb, buf, sizeof buf, 0);
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error = (pn->pn_func)(curproc, proc, pn, &sb);
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if (proc != NULL)
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PRELE(proc);
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if (error) {
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sbuf_delete(&sb);
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return (error);
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}
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/* XXX we should detect and handle overflows */
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sbuf_finish(&sb);
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ps = sbuf_data(&sb) + uio->uio_offset;
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xlen = sbuf_len(&sb) - uio->uio_offset;
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xlen = imin(xlen, uio->uio_resid);
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error = (xlen <= 0 ? 0 : uiomove(ps, xlen, uio));
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sbuf_delete(&sb);
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return (error);
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}
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/*
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* Reclaim a vnode
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*/
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static int
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pfs_reclaim(struct vop_reclaim_args *va)
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{
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return (pfs_vncache_free(va->a_vp));
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}
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/*
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* Set attributes
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*/
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static int
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pfs_setattr(struct vop_setattr_args *va)
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{
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if (va->a_vap->va_flags != (u_long)VNOVAL)
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return (EOPNOTSUPP);
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/* XXX it's a bit more complex than that, really... */
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return (0);
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}
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/*
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* Dummy operations
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*/
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static int pfs_erofs(void *va) { return (EROFS); }
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#if 0
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static int pfs_null(void *va) { return (0); }
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#endif
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/*
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* Vnode operations
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*/
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vop_t **pfs_vnodeop_p;
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static struct vnodeopv_entry_desc pfs_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *)vop_defaultop },
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{ &vop_access_desc, (vop_t *)pfs_access },
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{ &vop_close_desc, (vop_t *)pfs_close },
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{ &vop_create_desc, (vop_t *)pfs_erofs },
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{ &vop_getattr_desc, (vop_t *)pfs_getattr },
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{ &vop_link_desc, (vop_t *)pfs_erofs },
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{ &vop_lookup_desc, (vop_t *)pfs_lookup },
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{ &vop_mkdir_desc, (vop_t *)pfs_erofs },
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{ &vop_open_desc, (vop_t *)pfs_open },
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{ &vop_read_desc, (vop_t *)pfs_read },
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{ &vop_readdir_desc, (vop_t *)pfs_readdir },
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{ &vop_readlink_desc, (vop_t *)pfs_readlink },
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{ &vop_reclaim_desc, (vop_t *)pfs_reclaim },
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{ &vop_remove_desc, (vop_t *)pfs_erofs },
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{ &vop_rename_desc, (vop_t *)pfs_erofs },
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{ &vop_rmdir_desc, (vop_t *)pfs_erofs },
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{ &vop_setattr_desc, (vop_t *)pfs_setattr },
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{ &vop_symlink_desc, (vop_t *)pfs_erofs },
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{ &vop_write_desc, (vop_t *)pfs_erofs },
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/* XXX I've probably forgotten a few that need pfs_erofs */
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{ NULL, (vop_t *)NULL }
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};
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static struct vnodeopv_desc pfs_vnodeop_opv_desc =
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{ &pfs_vnodeop_p, pfs_vnodeop_entries };
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VNODEOP_SET(pfs_vnodeop_opv_desc);
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