289 lines
8.2 KiB
C
289 lines
8.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2007-2009 Google Inc. and Amit Singh
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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 are
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* met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Copyright (C) 2005 Csaba Henk.
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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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* 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 AUTHOR 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 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
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/module.h>
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#include <sys/systm.h>
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#include <sys/errno.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/conf.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/queue.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <sys/sysctl.h>
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#include "fuse.h"
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#include "fuse_file.h"
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#include "fuse_internal.h"
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#include "fuse_ipc.h"
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#include "fuse_node.h"
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#define FUSE_DEBUG_MODULE FILE
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#include "fuse_debug.h"
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static int fuse_fh_count = 0;
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SYSCTL_INT(_vfs_fuse, OID_AUTO, filehandle_count, CTLFLAG_RD,
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&fuse_fh_count, 0, "");
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int
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fuse_filehandle_open(struct vnode *vp,
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fufh_type_t fufh_type,
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struct fuse_filehandle **fufhp,
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struct thread *td,
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struct ucred *cred)
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{
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struct fuse_dispatcher fdi;
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struct fuse_open_in *foi;
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struct fuse_open_out *foo;
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int err = 0;
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int oflags = 0;
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int op = FUSE_OPEN;
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fuse_trace_printf("fuse_filehandle_open(vp=%p, fufh_type=%d)\n",
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vp, fufh_type);
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if (fuse_filehandle_valid(vp, fufh_type)) {
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panic("FUSE: filehandle_open called despite valid fufh (type=%d)",
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fufh_type);
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/* NOTREACHED */
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}
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/*
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* Note that this means we are effectively FILTERING OUT open() flags.
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*/
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oflags = fuse_filehandle_xlate_to_oflags(fufh_type);
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if (vnode_isdir(vp)) {
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op = FUSE_OPENDIR;
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if (fufh_type != FUFH_RDONLY) {
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printf("FUSE:non-rdonly fh requested for a directory?\n");
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fufh_type = FUFH_RDONLY;
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}
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}
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fdisp_init(&fdi, sizeof(*foi));
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fdisp_make_vp(&fdi, op, vp, td, cred);
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foi = fdi.indata;
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foi->flags = oflags;
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if ((err = fdisp_wait_answ(&fdi))) {
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debug_printf("OUCH ... daemon didn't give fh (err = %d)\n", err);
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if (err == ENOENT) {
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fuse_internal_vnode_disappear(vp);
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}
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goto out;
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}
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foo = fdi.answ;
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fuse_filehandle_init(vp, fufh_type, fufhp, foo->fh);
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/*
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* For WRONLY opens, force DIRECT_IO. This is necessary
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* since writing a partial block through the buffer cache
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* will result in a read of the block and that read won't
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* be allowed by the WRONLY open.
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*/
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if (fufh_type == FUFH_WRONLY)
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fuse_vnode_open(vp, foo->open_flags | FOPEN_DIRECT_IO, td);
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else
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fuse_vnode_open(vp, foo->open_flags, td);
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out:
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fdisp_destroy(&fdi);
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return err;
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}
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int
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fuse_filehandle_close(struct vnode *vp,
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fufh_type_t fufh_type,
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struct thread *td,
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struct ucred *cred)
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{
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struct fuse_dispatcher fdi;
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struct fuse_release_in *fri;
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct fuse_filehandle *fufh = NULL;
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int err = 0;
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int op = FUSE_RELEASE;
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fuse_trace_printf("fuse_filehandle_put(vp=%p, fufh_type=%d)\n",
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vp, fufh_type);
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fufh = &(fvdat->fufh[fufh_type]);
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if (!FUFH_IS_VALID(fufh)) {
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panic("FUSE: filehandle_put called on invalid fufh (type=%d)",
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fufh_type);
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/* NOTREACHED */
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}
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if (fuse_isdeadfs(vp)) {
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goto out;
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}
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if (vnode_isdir(vp))
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op = FUSE_RELEASEDIR;
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fdisp_init(&fdi, sizeof(*fri));
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fdisp_make_vp(&fdi, op, vp, td, cred);
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fri = fdi.indata;
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fri->fh = fufh->fh_id;
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fri->flags = fuse_filehandle_xlate_to_oflags(fufh_type);
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err = fdisp_wait_answ(&fdi);
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fdisp_destroy(&fdi);
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out:
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atomic_subtract_acq_int(&fuse_fh_count, 1);
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fufh->fh_id = (uint64_t)-1;
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fufh->fh_type = FUFH_INVALID;
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return err;
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}
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int
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fuse_filehandle_valid(struct vnode *vp, fufh_type_t fufh_type)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct fuse_filehandle *fufh;
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fufh = &(fvdat->fufh[fufh_type]);
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return FUFH_IS_VALID(fufh);
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}
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/*
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* Check for a valid file handle, first the type requested, but if that
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* isn't valid, try for FUFH_RDWR.
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* Return the FUFH type that is valid or FUFH_INVALID if there are none.
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* This is a variant of fuse_filehandle_vaild() analogous to
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* fuse_filehandle_getrw().
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*/
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fufh_type_t
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fuse_filehandle_validrw(struct vnode *vp, fufh_type_t fufh_type)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct fuse_filehandle *fufh;
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fufh = &fvdat->fufh[fufh_type];
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if (FUFH_IS_VALID(fufh) != 0)
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return (fufh_type);
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fufh = &fvdat->fufh[FUFH_RDWR];
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if (FUFH_IS_VALID(fufh) != 0)
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return (FUFH_RDWR);
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return (FUFH_INVALID);
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}
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int
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fuse_filehandle_get(struct vnode *vp, fufh_type_t fufh_type,
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struct fuse_filehandle **fufhp)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct fuse_filehandle *fufh;
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fufh = &(fvdat->fufh[fufh_type]);
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if (!FUFH_IS_VALID(fufh))
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return EBADF;
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if (fufhp != NULL)
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*fufhp = fufh;
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return 0;
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}
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int
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fuse_filehandle_getrw(struct vnode *vp, fufh_type_t fufh_type,
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struct fuse_filehandle **fufhp)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct fuse_filehandle *fufh;
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fufh = &(fvdat->fufh[fufh_type]);
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if (!FUFH_IS_VALID(fufh)) {
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fufh_type = FUFH_RDWR;
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}
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return fuse_filehandle_get(vp, fufh_type, fufhp);
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}
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void
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fuse_filehandle_init(struct vnode *vp,
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fufh_type_t fufh_type,
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struct fuse_filehandle **fufhp,
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uint64_t fh_id)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct fuse_filehandle *fufh;
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FS_DEBUG("id=%jd type=%d\n", (intmax_t)fh_id, fufh_type);
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fufh = &(fvdat->fufh[fufh_type]);
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MPASS(!FUFH_IS_VALID(fufh));
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fufh->fh_id = fh_id;
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fufh->fh_type = fufh_type;
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if (!FUFH_IS_VALID(fufh)) {
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panic("FUSE: init: invalid filehandle id (type=%d)", fufh_type);
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}
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if (fufhp != NULL)
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*fufhp = fufh;
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atomic_add_acq_int(&fuse_fh_count, 1);
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}
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