e6e2445622
When "cp" of a file with read-only (mode 0444) to a fuse mounted file system was attempted it would fail with EACCES. This was because fuse would attempt to open the file WRONLY and the open would fail. This patch changes the fuse_vnop_open() to test for an extant read-write open and use that, if it is available. This makes the "cp" of a read-only file to the fuse mounted file system work ok. There are simpler ways to fix this than adding the fuse_filehandle_validrw() function, but this function is useful for future patches related to exporting a fuse filesystem via NFS. MFC after: 2 weeks
292 lines
8.2 KiB
C
292 lines
8.2 KiB
C
/*
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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 isdir = 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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isdir = 1;
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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 isdir = 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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isdir = 1;
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}
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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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