377 lines
10 KiB
C
377 lines
10 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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* Copyright (c) 2019 The FreeBSD Foundation
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*
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* Portions of this software were developed by BFF Storage Systems, LLC under
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* sponsorship from the FreeBSD Foundation.
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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/param.h>
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#include <sys/systm.h>
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#include <sys/counter.h>
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#include <sys/module.h>
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#include <sys/errno.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/sdt.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_io.h"
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#include "fuse_ipc.h"
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#include "fuse_node.h"
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MALLOC_DEFINE(M_FUSE_FILEHANDLE, "fuse_filefilehandle", "FUSE file handle");
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SDT_PROVIDER_DECLARE(fusefs);
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/*
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* Fuse trace probe:
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* arg0: verbosity. Higher numbers give more verbose messages
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* arg1: Textual message
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*/
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SDT_PROBE_DEFINE2(fusefs, , file, trace, "int", "char*");
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static counter_u64_t fuse_fh_count;
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SYSCTL_COUNTER_U64(_vfs_fusefs_stats, OID_AUTO, filehandle_count, CTLFLAG_RD,
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&fuse_fh_count, "number of open FUSE filehandles");
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/* Get the FUFH type for a particular access mode */
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static inline fufh_type_t
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fflags_2_fufh_type(int fflags)
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{
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if ((fflags & FREAD) && (fflags & FWRITE))
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return FUFH_RDWR;
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else if (fflags & (FWRITE))
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return FUFH_WRONLY;
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else if (fflags & (FREAD))
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return FUFH_RDONLY;
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else if (fflags & (FEXEC))
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return FUFH_EXEC;
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else
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panic("FUSE: What kind of a flag is this (%x)?", fflags);
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}
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int
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fuse_filehandle_open(struct vnode *vp, int a_mode,
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struct fuse_filehandle **fufhp, struct thread *td, 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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fufh_type_t fufh_type;
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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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fufh_type = fflags_2_fufh_type(a_mode);
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oflags = fufh_type_2_fflags(fufh_type);
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if (vnode_isdir(vp)) {
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op = FUSE_OPENDIR;
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/* vn_open_vnode already rejects FWRITE on directories */
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MPASS(fufh_type == FUFH_RDONLY || fufh_type == FUFH_EXEC);
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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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SDT_PROBE2(fusefs, , file, trace, 1,
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"OUCH ... daemon didn't give fh");
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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, td, cred, foo);
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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, struct fuse_filehandle *fufh,
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struct thread *td, 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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int err = 0;
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int op = FUSE_RELEASE;
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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 = fufh_type_2_fflags(fufh->fufh_type);
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/*
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* If the file has a POSIX lock then we're supposed to set lock_owner.
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* If not, then lock_owner is undefined. So we may as well always set
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* it.
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*/
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fri->lock_owner = td->td_proc->p_pid;
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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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counter_u64_add(fuse_fh_count, -1);
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LIST_REMOVE(fufh, next);
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free(fufh, M_FUSE_FILEHANDLE);
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return err;
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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 true if there is any file handle with the correct credentials and
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* a fufh type that includes the provided one.
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* A pid of 0 means "don't care"
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*/
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bool
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fuse_filehandle_validrw(struct vnode *vp, int mode,
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struct ucred *cred, pid_t pid)
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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_type_t fufh_type = fflags_2_fufh_type(mode);
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/*
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* Unlike fuse_filehandle_get, we want to search for a filehandle with
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* the exact cred, and no fallback
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*/
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LIST_FOREACH(fufh, &fvdat->handles, next) {
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if (fufh->fufh_type == fufh_type &&
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fufh->uid == cred->cr_uid &&
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fufh->gid == cred->cr_rgid &&
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(pid == 0 || fufh->pid == pid))
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return true;
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}
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if (fufh_type == FUFH_EXEC)
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return false;
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/* Fallback: find a RDWR list entry with the right cred */
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LIST_FOREACH(fufh, &fvdat->handles, next) {
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if (fufh->fufh_type == FUFH_RDWR &&
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fufh->uid == cred->cr_uid &&
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fufh->gid == cred->cr_rgid &&
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(pid == 0 || fufh->pid == pid))
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return true;
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}
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return false;
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}
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int
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fuse_filehandle_get(struct vnode *vp, int fflag,
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struct fuse_filehandle **fufhp, struct ucred *cred, pid_t pid)
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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_type_t fufh_type;
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fufh_type = fflags_2_fufh_type(fflag);
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/* cred can be NULL for in-kernel clients */
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if (cred == NULL)
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goto fallback;
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LIST_FOREACH(fufh, &fvdat->handles, next) {
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if (fufh->fufh_type == fufh_type &&
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fufh->uid == cred->cr_uid &&
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fufh->gid == cred->cr_rgid &&
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(pid == 0 || fufh->pid == pid))
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goto found;
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}
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fallback:
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/* Fallback: find a list entry with the right flags */
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LIST_FOREACH(fufh, &fvdat->handles, next) {
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if (fufh->fufh_type == fufh_type)
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break;
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}
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if (fufh == NULL)
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return EBADF;
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found:
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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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/* Get a file handle with any kind of flags */
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int
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fuse_filehandle_get_anyflags(struct vnode *vp,
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struct fuse_filehandle **fufhp, struct ucred *cred, pid_t pid)
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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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if (cred == NULL)
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goto fallback;
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LIST_FOREACH(fufh, &fvdat->handles, next) {
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if (fufh->uid == cred->cr_uid &&
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fufh->gid == cred->cr_rgid &&
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(pid == 0 || fufh->pid == pid))
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goto found;
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}
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fallback:
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/* Fallback: find any list entry */
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fufh = LIST_FIRST(&fvdat->handles);
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if (fufh == NULL)
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return EBADF;
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found:
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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, int fflag,
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struct fuse_filehandle **fufhp, struct ucred *cred, pid_t pid)
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{
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int err;
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err = fuse_filehandle_get(vp, fflag, fufhp, cred, pid);
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if (err)
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err = fuse_filehandle_get(vp, FREAD | FWRITE, fufhp, cred, pid);
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return err;
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}
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void
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fuse_filehandle_init(struct vnode *vp, fufh_type_t fufh_type,
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struct fuse_filehandle **fufhp, struct thread *td, struct ucred *cred,
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struct fuse_open_out *foo)
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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 = malloc(sizeof(struct fuse_filehandle), M_FUSE_FILEHANDLE,
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M_WAITOK);
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MPASS(fufh != NULL);
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fufh->fh_id = foo->fh;
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fufh->fufh_type = fufh_type;
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fufh->gid = cred->cr_rgid;
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fufh->uid = cred->cr_uid;
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fufh->pid = td->td_proc->p_pid;
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fufh->fuse_open_flags = foo->open_flags;
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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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LIST_INSERT_HEAD(&fvdat->handles, fufh, next);
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if (fufhp != NULL)
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*fufhp = fufh;
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counter_u64_add(fuse_fh_count, 1);
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if (foo->open_flags & FOPEN_DIRECT_IO) {
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ASSERT_VOP_ELOCKED(vp, __func__);
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VTOFUD(vp)->flag |= FN_DIRECTIO;
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fuse_io_invalbuf(vp, td);
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} else {
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if ((foo->open_flags & FOPEN_KEEP_CACHE) == 0)
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fuse_io_invalbuf(vp, td);
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VTOFUD(vp)->flag &= ~FN_DIRECTIO;
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}
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}
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void
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fuse_file_init(void)
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{
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fuse_fh_count = counter_u64_alloc(M_WAITOK);
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}
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void
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fuse_file_destroy(void)
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{
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counter_u64_free(fuse_fh_count);
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}
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