591 lines
13 KiB
C
591 lines
13 KiB
C
/* $NetBSD: null.c,v 1.25 2008/08/12 19:44:39 pooka Exp $ */
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/*
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* Copyright (c) 2007 Antti Kantee. 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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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 OR
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* 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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#include <sys/cdefs.h>
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#if !defined(lint)
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__RCSID("$NetBSD: null.c,v 1.25 2008/08/12 19:44:39 pooka Exp $");
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#endif /* !lint */
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/*
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* A "nullfs" using puffs, i.e. maps one location in the hierarchy
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* to another using standard system calls.
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <assert.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <utime.h>
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#include "puffs.h"
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PUFFSOP_PROTOS(puffs_null)
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/*
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* set attributes to what is specified. XXX: no rollback in case of failure
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*/
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static int
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processvattr(const char *path, const struct vattr *va, int regular)
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{
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struct utimbuf tbuf;
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/* XXX: -1 == PUFFS_VNOVAL, but shouldn't trust that */
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if (va->va_uid != (unsigned)-1 || va->va_gid != (unsigned)-1)
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/* FIXME: lchown */
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if (chown(path, va->va_uid, va->va_gid) == -1)
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return errno;
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#ifndef __minix
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if (va->va_mode != (unsigned)PUFFS_VNOVAL)
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#endif
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/* FIXME: lchmod */
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if (chmod(path, va->va_mode) == -1)
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return errno;
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/* sloppy */
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if (va->va_atime.tv_sec != PUFFS_VNOVAL
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|| va->va_mtime.tv_sec != PUFFS_VNOVAL) {
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/* FIXME: nsec too */
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tbuf.actime = va->va_atime.tv_sec;
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tbuf.modtime = va->va_mtime.tv_sec;
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/* FIXME: lutimes */
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if (utime(path, &tbuf) == -1)
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return errno;
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}
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if (regular && va->va_size != (u_quad_t)PUFFS_VNOVAL)
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if (truncate(path, (off_t)va->va_size) == -1)
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return errno;
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return 0;
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}
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/*
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* Kludge to open files which aren't writable *any longer*. This kinda
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* works because the vfs layer does validation checks based on the file's
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* permissions to allow writable opening before opening them. However,
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* the problem arises if we want to create a file, write to it (cache),
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* adjust permissions and then flush the file.
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*/
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static int
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writeableopen(const char *path)
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{
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struct stat sb;
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mode_t origmode;
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int sverr = 0;
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int fd;
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fd = open(path, O_WRONLY);
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if (fd == -1) {
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if (errno == EACCES) {
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if (stat(path, &sb) == -1)
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return -1;
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origmode = sb.st_mode & ALLPERMS;
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if (chmod(path, 0200) == -1)
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return -1;
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fd = open(path, O_WRONLY);
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if (fd == -1)
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sverr = errno;
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chmod(path, origmode);
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if (sverr)
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errno = sverr;
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} else
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return -1;
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}
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return fd;
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}
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/*ARGSUSED*/
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static void *
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inodecmp(struct puffs_usermount *pu, struct puffs_node *pn, void *arg)
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{
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ino_t *cmpino = arg;
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if (pn->pn_va.va_fileid == *cmpino)
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return pn;
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return NULL;
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}
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static int
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makenode(struct puffs_usermount *pu, struct puffs_newinfo *pni,
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const struct puffs_cn *pcn, const struct vattr *va, int regular)
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{
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struct puffs_node *pn;
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struct stat sb;
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int rv;
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if ((rv = processvattr(PCNPATH(pcn), va, regular)) != 0)
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return rv;
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pn = puffs_pn_new(pu, NULL);
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if (!pn)
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return ENOMEM;
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puffs_setvattr(&pn->pn_va, va);
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if (lstat(PCNPATH(pcn), &sb) == -1)
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return errno;
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puffs_stat2vattr(&pn->pn_va, &sb);
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puffs_newinfo_setcookie(pni, pn);
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return 0;
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}
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/* This should be called first and overriden from the file system */
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void
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puffs_null_setops(struct puffs_ops *pops)
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{
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PUFFSOP_SET(pops, puffs_null, fs, statvfs);
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PUFFSOP_SETFSNOP(pops, unmount);
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PUFFSOP_SETFSNOP(pops, sync);
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PUFFSOP_SET(pops, puffs_null, node, lookup);
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PUFFSOP_SET(pops, puffs_null, node, create);
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PUFFSOP_SET(pops, puffs_null, node, mknod);
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PUFFSOP_SET(pops, puffs_null, node, getattr);
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PUFFSOP_SET(pops, puffs_null, node, setattr);
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PUFFSOP_SET(pops, puffs_null, node, fsync);
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PUFFSOP_SET(pops, puffs_null, node, remove);
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PUFFSOP_SET(pops, puffs_null, node, link);
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PUFFSOP_SET(pops, puffs_null, node, rename);
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PUFFSOP_SET(pops, puffs_null, node, mkdir);
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PUFFSOP_SET(pops, puffs_null, node, rmdir);
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PUFFSOP_SET(pops, puffs_null, node, symlink);
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PUFFSOP_SET(pops, puffs_null, node, readlink);
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PUFFSOP_SET(pops, puffs_null, node, readdir);
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PUFFSOP_SET(pops, puffs_null, node, read);
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PUFFSOP_SET(pops, puffs_null, node, write);
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PUFFSOP_SET(pops, puffs_genfs, node, reclaim);
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}
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/*ARGSUSED*/
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int
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puffs_null_fs_statvfs(struct puffs_usermount *pu, struct statvfs *svfsb)
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{
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if (statvfs(PNPATH(puffs_getroot(pu)), svfsb) == -1)
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return errno;
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return 0;
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}
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int
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puffs_null_node_lookup(struct puffs_usermount *pu, puffs_cookie_t opc,
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struct puffs_newinfo *pni, const struct puffs_cn *pcn)
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{
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struct puffs_node *pn = opc, *pn_res;
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struct stat sb;
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int rv;
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assert(pn->pn_va.va_type == VDIR);
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/*
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* Note to whoever is copypasting this: you must first check
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* if the node is there and only then do nodewalk. Alternatively
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* you could make sure that you don't return unlinked/rmdir'd
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* nodes in some other fashion
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*/
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rv = lstat(PCNPATH(pcn), &sb);
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if (rv)
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return errno;
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/* XXX2: nodewalk is a bit too slow here */
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pn_res = puffs_pn_nodewalk(pu, inodecmp, &sb.st_ino);
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if (pn_res == NULL) {
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pn_res = puffs_pn_new(pu, NULL);
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if (pn_res == NULL)
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return ENOMEM;
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puffs_stat2vattr(&pn_res->pn_va, &sb);
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}
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puffs_newinfo_setcookie(pni, pn_res);
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puffs_newinfo_setvtype(pni, pn_res->pn_va.va_type);
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puffs_newinfo_setsize(pni, (voff_t)pn_res->pn_va.va_size);
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puffs_newinfo_setrdev(pni, pn_res->pn_va.va_rdev);
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_create(struct puffs_usermount *pu, puffs_cookie_t opc,
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struct puffs_newinfo *pni, const struct puffs_cn *pcn,
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const struct vattr *va)
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{
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int fd, rv;
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fd = open(PCNPATH(pcn), O_RDWR | O_CREAT | O_TRUNC);
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if (fd == -1)
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return errno;
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close(fd);
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rv = makenode(pu, pni, pcn, va, 1);
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if (rv)
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unlink(PCNPATH(pcn));
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return rv;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_mknod(struct puffs_usermount *pu, puffs_cookie_t opc,
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struct puffs_newinfo *pni, const struct puffs_cn *pcn,
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const struct vattr *va)
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{
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mode_t mode;
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int rv;
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mode = puffs_addvtype2mode(va->va_mode, va->va_type);
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if (mknod(PCNPATH(pcn), mode, va->va_rdev) == -1)
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return errno;
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rv = makenode(pu, pni, pcn, va, 0);
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if (rv)
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unlink(PCNPATH(pcn));
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return rv;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_getattr(struct puffs_usermount *pu, puffs_cookie_t opc,
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struct vattr *va, const struct puffs_cred *pcred)
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{
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struct puffs_node *pn = opc;
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struct stat sb;
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if (lstat(PNPATH(pn), &sb) == -1)
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return errno;
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puffs_stat2vattr(va, &sb);
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_setattr(struct puffs_usermount *pu, puffs_cookie_t opc,
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const struct vattr *va, const struct puffs_cred *pcred)
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{
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struct puffs_node *pn = opc;
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int rv;
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rv = processvattr(PNPATH(pn), va, pn->pn_va.va_type == VREG);
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if (rv)
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return rv;
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puffs_setvattr(&pn->pn_va, va);
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_fsync(struct puffs_usermount *pu, puffs_cookie_t opc,
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const struct puffs_cred *pcred, int how,
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off_t offlo, off_t offhi)
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{
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/* FIXME: implement me. */
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#if 0
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struct puffs_node *pn = opc;
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int fd, rv;
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int fflags;
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rv = 0;
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fd = writeableopen(PNPATH(pn));
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if (fd == -1)
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return errno;
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if (how & PUFFS_FSYNC_DATAONLY)
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fflags = FDATASYNC;
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else
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fflags = FFILESYNC;
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if (how & PUFFS_FSYNC_CACHE)
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fflags |= FDISKSYNC;
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if (fsync_range(fd, fflags, offlo, offhi - offlo) == -1)
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rv = errno;
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close(fd);
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return rv;
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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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puffs_null_node_remove(struct puffs_usermount *pu, puffs_cookie_t opc,
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puffs_cookie_t targ, const struct puffs_cn *pcn)
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{
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struct puffs_node *pn_targ = targ;
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if (unlink(PCNPATH(pcn)) == -1)
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return errno;
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puffs_pn_remove(pn_targ);
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_link(struct puffs_usermount *pu, puffs_cookie_t opc,
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puffs_cookie_t targ, const struct puffs_cn *pcn)
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{
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struct puffs_node *pn_targ = targ;
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if (link(PNPATH(pn_targ), PCNPATH(pcn)) == -1)
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return errno;
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_rename(struct puffs_usermount *pu, puffs_cookie_t opc,
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puffs_cookie_t src, const struct puffs_cn *pcn_src,
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puffs_cookie_t targ_dir, puffs_cookie_t targ,
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const struct puffs_cn *pcn_targ)
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{
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struct puffs_node *pn_targ = targ;
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if (rename(PCNPATH(pcn_src), PCNPATH(pcn_targ)) == -1)
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return errno;
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if (pn_targ)
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puffs_pn_remove(pn_targ);
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_mkdir(struct puffs_usermount *pu, puffs_cookie_t opc,
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struct puffs_newinfo *pni, const struct puffs_cn *pcn,
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const struct vattr *va)
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{
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int rv;
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if (mkdir(PCNPATH(pcn), va->va_mode) == -1)
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return errno;
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rv = makenode(pu, pni, pcn, va, 0);
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if (rv)
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rmdir(PCNPATH(pcn));
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return rv;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_rmdir(struct puffs_usermount *pu, puffs_cookie_t opc,
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puffs_cookie_t targ, const struct puffs_cn *pcn)
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{
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struct puffs_node *pn_targ = targ;
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if (rmdir(PNPATH(pn_targ)) == -1)
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return errno;
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puffs_pn_remove(pn_targ);
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_symlink(struct puffs_usermount *pu, puffs_cookie_t opc,
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struct puffs_newinfo *pni, const struct puffs_cn *pcn,
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const struct vattr *va, const char *linkname)
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{
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int rv;
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if (symlink(linkname, PCNPATH(pcn)) == -1)
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return errno;
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rv = makenode(pu, pni, pcn, va, 0);
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if (rv)
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unlink(PCNPATH(pcn));
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return rv;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_readlink(struct puffs_usermount *pu, puffs_cookie_t opc,
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const struct puffs_cred *pcred, char *linkname, size_t *linklen)
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{
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struct puffs_node *pn = opc;
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ssize_t rv;
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rv = readlink(PNPATH(pn), linkname, *linklen);
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if (rv == -1)
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return errno;
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*linklen = rv;
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return 0;
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}
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/*ARGSUSED*/
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int
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puffs_null_node_readdir(struct puffs_usermount *pu, puffs_cookie_t opc,
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struct dirent *de, off_t *off, size_t *reslen,
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const struct puffs_cred *pcred, int *eofflag, off_t *cookies,
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size_t *ncookies)
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{
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/* TODO: use original code since we have libc from NetBSD */
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struct puffs_node *pn = opc;
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struct dirent *entry;
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DIR *dp;
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off_t i;
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int rv;
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dp = opendir(PNPATH(pn));
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if (dp == NULL)
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return errno;
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rv = 0;
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i = *off;
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/*
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* XXX: need to do trickery here, telldir/seekdir would be nice, but
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* then we'd need to keep state, which I'm too lazy to keep
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*/
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while (i--) {
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entry = readdir(dp);
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if (!entry) {
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*eofflag = 1;
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goto out;
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}
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}
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for (;;) {
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/* FIXME: DIRENT_SIZE macro? For now do calculations here */
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int namelen;
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char* cp;
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size_t dirent_size;
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entry = readdir(dp);
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if (!entry) {
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*eofflag = 1;
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goto out;
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}
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cp = memchr(entry->d_name, '\0', NAME_MAX);
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if (cp == NULL)
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namelen = NAME_MAX;
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else
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namelen = cp - (entry->d_name);
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dirent_size = _DIRENT_RECLEN(entry, namelen);
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if (dirent_size > *reslen)
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goto out;
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*de = *entry;
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strncpy(de->d_name, entry->d_name, namelen);
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*reslen -= dirent_size;
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de = _DIRENT_NEXT(de);
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(*off)++;
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}
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out:
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|
closedir(dp);
|
|
return 0;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
puffs_null_node_read(struct puffs_usermount *pu, puffs_cookie_t opc,
|
|
uint8_t *buf, off_t offset, size_t *buflen,
|
|
const struct puffs_cred *pcred, int ioflag)
|
|
{
|
|
struct puffs_node *pn = opc;
|
|
ssize_t n;
|
|
off_t off;
|
|
int fd, rv;
|
|
|
|
rv = 0;
|
|
fd = open(PNPATH(pn), O_RDONLY);
|
|
if (fd == -1)
|
|
return errno;
|
|
off = lseek(fd, offset, SEEK_SET);
|
|
if (off == -1) {
|
|
rv = errno;
|
|
goto out;
|
|
}
|
|
|
|
n = read(fd, buf, *buflen);
|
|
if (n == -1)
|
|
rv = errno;
|
|
else
|
|
*buflen -= n;
|
|
|
|
out:
|
|
close(fd);
|
|
return rv;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
puffs_null_node_write(struct puffs_usermount *pu, puffs_cookie_t opc,
|
|
uint8_t *buf, off_t offset, size_t *buflen,
|
|
const struct puffs_cred *pcred, int ioflag)
|
|
{
|
|
struct puffs_node *pn = opc;
|
|
ssize_t n;
|
|
off_t off;
|
|
int fd, rv;
|
|
|
|
rv = 0;
|
|
fd = writeableopen(PNPATH(pn));
|
|
if (fd == -1)
|
|
return errno;
|
|
|
|
off = lseek(fd, offset, SEEK_SET);
|
|
if (off == -1) {
|
|
rv = errno;
|
|
goto out;
|
|
}
|
|
|
|
n = write(fd, buf, *buflen);
|
|
if (n == -1)
|
|
rv = errno;
|
|
else
|
|
*buflen -= n;
|
|
|
|
out:
|
|
close(fd);
|
|
return rv;
|
|
}
|