276 lines
7.0 KiB
C
276 lines
7.0 KiB
C
/* $NetBSD: subr.c,v 1.18 2012/04/18 00:57:22 manu Exp $ */
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/*-
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* Copyright (c) 2010-2011 Emmanuel Dreyfus. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <err.h>
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#include <errno.h>
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#include <sysexits.h>
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#include <syslog.h>
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#include <puffs.h>
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#include <paths.h>
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#include <sys/extattr.h>
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#include "perfuse_priv.h"
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struct perfuse_ns_map {
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const char *pnm_ns;
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const size_t pnm_nslen;
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const int pnm_native_ns;
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};
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#define PERFUSE_NS_MAP(ns, native_ns) \
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{ ns ".", sizeof(ns), native_ns }
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static size_t node_path(puffs_cookie_t, char *, size_t);
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struct puffs_node *
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perfuse_new_pn(struct puffs_usermount *pu, const char *name,
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struct puffs_node *parent)
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{
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struct puffs_node *pn;
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struct perfuse_node_data *pnd;
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if ((pnd = malloc(sizeof(*pnd))) == NULL)
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DERR(EX_OSERR, "%s: malloc failed", __func__);
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if ((pn = puffs_pn_new(pu, pnd)) == NULL)
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DERR(EX_SOFTWARE, "%s: puffs_pn_new failed", __func__);
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(void)memset(pnd, 0, sizeof(*pnd));
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pnd->pnd_rfh = FUSE_UNKNOWN_FH;
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pnd->pnd_wfh = FUSE_UNKNOWN_FH;
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pnd->pnd_nodeid = PERFUSE_UNKNOWN_NODEID;
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pnd->pnd_fuse_nlookup = 1;
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pnd->pnd_puffs_nlookup = 1;
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pnd->pnd_parent = parent;
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pnd->pnd_pn = (puffs_cookie_t)pn;
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(void)strlcpy(pnd->pnd_name, name, MAXPATHLEN);
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TAILQ_INIT(&pnd->pnd_pcq);
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TAILQ_INIT(&pnd->pnd_children);
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if (parent != NULL) {
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struct perfuse_node_data *parent_pnd;
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parent_pnd = PERFUSE_NODE_DATA(parent);
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TAILQ_INSERT_TAIL(&parent_pnd->pnd_children, pnd, pnd_next);
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parent_pnd->pnd_childcount++;
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}
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return pn;
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}
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void
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perfuse_destroy_pn(struct puffs_node *pn)
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{
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struct perfuse_node_data *pnd;
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if ((pnd = puffs_pn_getpriv(pn)) != NULL) {
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if (pnd->pnd_parent != NULL) {
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struct perfuse_node_data *parent_pnd;
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parent_pnd = PERFUSE_NODE_DATA(pnd->pnd_parent);
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TAILQ_REMOVE(&parent_pnd->pnd_children, pnd, pnd_next);
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PERFUSE_NODE_DATA(pnd->pnd_parent)->pnd_childcount--;
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}
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if (pnd->pnd_dirent != NULL)
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free(pnd->pnd_dirent);
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if (pnd->pnd_all_fd != NULL)
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free(pnd->pnd_all_fd);
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#ifdef PERFUSE_DEBUG
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if (pnd->pnd_flags & PND_OPEN)
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DERRX(EX_SOFTWARE, "%s: file open", __func__);
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if (!TAILQ_EMPTY(&pnd->pnd_pcq))
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DERRX(EX_SOFTWARE, "%s: non empty pnd_pcq", __func__);
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#endif /* PERFUSE_DEBUG */
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free(pnd);
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}
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puffs_pn_put(pn);
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return;
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}
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void
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perfuse_new_fh(puffs_cookie_t opc, uint64_t fh, int mode)
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{
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struct perfuse_node_data *pnd;
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pnd = PERFUSE_NODE_DATA(opc);
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if (mode & FWRITE) {
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if (pnd->pnd_flags & PND_WFH)
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DERRX(EX_SOFTWARE, "%s: opc = %p, write fh already set",
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__func__, (void *)opc);
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pnd->pnd_wfh = fh;
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pnd->pnd_flags |= PND_WFH;
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}
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if (mode & FREAD) {
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if (pnd->pnd_flags & PND_RFH)
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DERRX(EX_SOFTWARE, "%s: opc = %p, read fh already set",
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__func__, (void *)opc);
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pnd->pnd_rfh = fh;
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pnd->pnd_flags |= PND_RFH;
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}
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return;
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}
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void
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perfuse_destroy_fh(puffs_cookie_t opc, uint64_t fh)
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{
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struct perfuse_node_data *pnd;
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pnd = PERFUSE_NODE_DATA(opc);
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if (fh == pnd->pnd_rfh) {
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if (!(pnd->pnd_flags & PND_RFH) && (fh != FUSE_UNKNOWN_FH))
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DERRX(EX_SOFTWARE,
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"%s: opc = %p, unset rfh = %"PRIx64"",
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__func__, (void *)opc, fh);
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pnd->pnd_rfh = FUSE_UNKNOWN_FH;
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pnd->pnd_flags &= ~PND_RFH;
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}
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if (fh == pnd->pnd_wfh) {
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if (!(pnd->pnd_flags & PND_WFH) && (fh != FUSE_UNKNOWN_FH))
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DERRX(EX_SOFTWARE,
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"%s: opc = %p, unset wfh = %"PRIx64"",
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__func__, (void *)opc, fh);
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pnd->pnd_wfh = FUSE_UNKNOWN_FH;
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pnd->pnd_flags &= ~PND_WFH;
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}
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return;
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}
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uint64_t
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perfuse_get_fh(puffs_cookie_t opc, int mode)
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{
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struct perfuse_node_data *pnd;
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pnd = PERFUSE_NODE_DATA(opc);
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if (mode & FWRITE) {
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if (pnd->pnd_flags & PND_WFH)
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return pnd->pnd_wfh;
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}
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if (mode & FREAD) {
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if (pnd->pnd_flags & PND_RFH)
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return pnd->pnd_rfh;
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if (pnd->pnd_flags & PND_WFH)
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return pnd->pnd_wfh;
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}
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return FUSE_UNKNOWN_FH;
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}
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static size_t
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node_path(puffs_cookie_t opc, char *buf, size_t buflen)
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{
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struct perfuse_node_data *pnd;
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size_t written;
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pnd = PERFUSE_NODE_DATA(opc);
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if (pnd->pnd_parent == opc)
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return 0;
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written = node_path(pnd->pnd_parent, buf, buflen);
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buf += written;
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buflen -= written;
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return written + snprintf(buf, buflen, "/%s", pnd->pnd_name);
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}
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char *
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perfuse_node_path(puffs_cookie_t opc)
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{
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static char buf[MAXPATHLEN + 1];
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if (node_path(opc, buf, sizeof(buf)) == 0)
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sprintf(buf, "/");
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return buf;
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}
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const char *
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perfuse_native_ns(const int attrnamespace, const char *attrname,
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char *fuse_attrname)
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{
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const struct perfuse_ns_map *pnm;
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const struct perfuse_ns_map perfuse_ns_map[] = {
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PERFUSE_NS_MAP("trusted", EXTATTR_NAMESPACE_SYSTEM),
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PERFUSE_NS_MAP("security", EXTATTR_NAMESPACE_SYSTEM),
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PERFUSE_NS_MAP("system", EXTATTR_NAMESPACE_SYSTEM),
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PERFUSE_NS_MAP("user", EXTATTR_NAMESPACE_USER),
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{ NULL, 0, EXTATTR_NAMESPACE_USER },
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};
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/*
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* If attribute has a reserved Linux namespace (e.g.: trusted.foo)
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* and that namespace matches the requested native namespace
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* we have nothing to do.
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* Otherwise we have either:
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* (system|trusted|security).* with user namespace: prepend user.
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* anything else with system napespace: prepend system.
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*/
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for (pnm = perfuse_ns_map; pnm->pnm_ns; pnm++) {
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if (strncmp(attrname, pnm->pnm_ns, pnm->pnm_nslen) != 0)
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continue;
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if (attrnamespace == pnm->pnm_native_ns)
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return attrname;
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/* (system|trusted|security).* with user namespace */
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if (attrnamespace == EXTATTR_NAMESPACE_USER) {
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(void)snprintf(fuse_attrname, LINUX_XATTR_NAME_MAX,
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"user.%s", attrname);
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return (const char *)fuse_attrname;
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}
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}
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/* anything else with system napespace */
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if (attrnamespace == EXTATTR_NAMESPACE_SYSTEM) {
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(void)snprintf(fuse_attrname, LINUX_XATTR_NAME_MAX,
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"system.%s", attrname);
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return (const char *)fuse_attrname;
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}
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return (const char *)attrname;
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}
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