4736ccfd9c
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815 lines
24 KiB
C
815 lines
24 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.
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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/rwlock.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/stat.h>
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#include <sys/unistd.h>
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#include <sys/filedesc.h>
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#include <sys/file.h>
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#include <sys/fcntl.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include "fuse.h"
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#include "fuse_file.h"
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#include "fuse_node.h"
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#include "fuse_internal.h"
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#include "fuse_ipc.h"
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#include "fuse_io.h"
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#define FUSE_DEBUG_MODULE IO
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#include "fuse_debug.h"
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static int
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fuse_read_directbackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh);
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static int
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fuse_read_biobackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh);
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static int
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fuse_write_directbackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh, int ioflag);
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static int
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fuse_write_biobackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh, int ioflag);
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int
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fuse_io_dispatch(struct vnode *vp, struct uio *uio, int ioflag,
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struct ucred *cred)
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{
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struct fuse_filehandle *fufh;
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int err, directio;
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MPASS(vp->v_type == VREG || vp->v_type == VDIR);
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err = fuse_filehandle_getrw(vp,
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(uio->uio_rw == UIO_READ) ? FUFH_RDONLY : FUFH_WRONLY, &fufh);
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if (err) {
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printf("FUSE: io dispatch: filehandles are closed\n");
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return err;
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}
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/*
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* Ideally, when the daemon asks for direct io at open time, the
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* standard file flag should be set according to this, so that would
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* just change the default mode, which later on could be changed via
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* fcntl(2).
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* But this doesn't work, the O_DIRECT flag gets cleared at some point
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* (don't know where). So to make any use of the Fuse direct_io option,
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* we hardwire it into the file's private data (similarly to Linux,
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* btw.).
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*/
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directio = (ioflag & IO_DIRECT) || !fsess_opt_datacache(vnode_mount(vp));
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switch (uio->uio_rw) {
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case UIO_READ:
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if (directio) {
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FS_DEBUG("direct read of vnode %ju via file handle %ju\n",
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(uintmax_t)VTOILLU(vp), (uintmax_t)fufh->fh_id);
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err = fuse_read_directbackend(vp, uio, cred, fufh);
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} else {
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FS_DEBUG("buffered read of vnode %ju\n",
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(uintmax_t)VTOILLU(vp));
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err = fuse_read_biobackend(vp, uio, cred, fufh);
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}
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break;
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case UIO_WRITE:
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if (directio) {
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FS_DEBUG("direct write of vnode %ju via file handle %ju\n",
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(uintmax_t)VTOILLU(vp), (uintmax_t)fufh->fh_id);
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err = fuse_write_directbackend(vp, uio, cred, fufh, ioflag);
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} else {
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FS_DEBUG("buffered write of vnode %ju\n",
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(uintmax_t)VTOILLU(vp));
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err = fuse_write_biobackend(vp, uio, cred, fufh, ioflag);
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}
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break;
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default:
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panic("uninterpreted mode passed to fuse_io_dispatch");
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}
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return (err);
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}
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static int
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fuse_read_biobackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh)
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{
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struct buf *bp;
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daddr_t lbn;
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int bcount;
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int err = 0, n = 0, on = 0;
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off_t filesize;
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const int biosize = fuse_iosize(vp);
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FS_DEBUG("resid=%zx offset=%jx fsize=%jx\n",
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uio->uio_resid, uio->uio_offset, VTOFUD(vp)->filesize);
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if (uio->uio_resid == 0)
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return (0);
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if (uio->uio_offset < 0)
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return (EINVAL);
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bcount = MIN(MAXBSIZE, biosize);
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filesize = VTOFUD(vp)->filesize;
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do {
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if (fuse_isdeadfs(vp)) {
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err = ENXIO;
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break;
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}
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lbn = uio->uio_offset / biosize;
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on = uio->uio_offset & (biosize - 1);
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FS_DEBUG2G("biosize %d, lbn %d, on %d\n", biosize, (int)lbn, on);
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/*
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* Obtain the buffer cache block. Figure out the buffer size
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* when we are at EOF. If we are modifying the size of the
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* buffer based on an EOF condition we need to hold
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* nfs_rslock() through obtaining the buffer to prevent
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* a potential writer-appender from messing with n_size.
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* Otherwise we may accidentally truncate the buffer and
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* lose dirty data.
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*
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* Note that bcount is *not* DEV_BSIZE aligned.
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*/
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if ((off_t)lbn * biosize >= filesize) {
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bcount = 0;
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} else if ((off_t)(lbn + 1) * biosize > filesize) {
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bcount = filesize - (off_t)lbn *biosize;
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}
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bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
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if (!bp)
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return (EINTR);
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/*
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* If B_CACHE is not set, we must issue the read. If this
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* fails, we return an error.
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*/
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if ((bp->b_flags & B_CACHE) == 0) {
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bp->b_iocmd = BIO_READ;
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vfs_busy_pages(bp, 0);
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err = fuse_io_strategy(vp, bp);
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if (err) {
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brelse(bp);
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return (err);
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}
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}
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/*
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* on is the offset into the current bp. Figure out how many
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* bytes we can copy out of the bp. Note that bcount is
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* NOT DEV_BSIZE aligned.
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*
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* Then figure out how many bytes we can copy into the uio.
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*/
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n = 0;
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if (on < bcount)
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n = MIN((unsigned)(bcount - on), uio->uio_resid);
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if (n > 0) {
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FS_DEBUG2G("feeding buffeater with %d bytes of buffer %p,"
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" saying %d was asked for\n",
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n, bp->b_data + on, n + (int)bp->b_resid);
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err = uiomove(bp->b_data + on, n, uio);
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}
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brelse(bp);
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FS_DEBUG2G("end of turn, err %d, uio->uio_resid %zd, n %d\n",
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err, uio->uio_resid, n);
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} while (err == 0 && uio->uio_resid > 0 && n > 0);
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return (err);
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}
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static int
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fuse_read_directbackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh)
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{
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struct fuse_dispatcher fdi;
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struct fuse_read_in *fri;
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int err = 0;
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if (uio->uio_resid == 0)
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return (0);
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fdisp_init(&fdi, 0);
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/*
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* XXX In "normal" case we use an intermediate kernel buffer for
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* transmitting data from daemon's context to ours. Eventually, we should
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* get rid of this. Anyway, if the target uio lives in sysspace (we are
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* called from pageops), and the input data doesn't need kernel-side
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* processing (we are not called from readdir) we can already invoke
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* an optimized, "peer-to-peer" I/O routine.
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*/
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while (uio->uio_resid > 0) {
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fdi.iosize = sizeof(*fri);
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fdisp_make_vp(&fdi, FUSE_READ, vp, uio->uio_td, cred);
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fri = fdi.indata;
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fri->fh = fufh->fh_id;
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fri->offset = uio->uio_offset;
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fri->size = MIN(uio->uio_resid,
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fuse_get_mpdata(vp->v_mount)->max_read);
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FS_DEBUG2G("fri->fh %ju, fri->offset %ju, fri->size %ju\n",
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(uintmax_t)fri->fh, (uintmax_t)fri->offset,
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(uintmax_t)fri->size);
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if ((err = fdisp_wait_answ(&fdi)))
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goto out;
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FS_DEBUG2G("complete: got iosize=%d, requested fri.size=%zd; "
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"resid=%zd offset=%ju\n",
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fri->size, fdi.iosize, uio->uio_resid,
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(uintmax_t)uio->uio_offset);
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if ((err = uiomove(fdi.answ, MIN(fri->size, fdi.iosize), uio)))
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break;
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if (fdi.iosize < fri->size)
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break;
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}
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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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static int
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fuse_write_directbackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh, int ioflag)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct fuse_write_in *fwi;
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struct fuse_dispatcher fdi;
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size_t chunksize;
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int diff;
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int err = 0;
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if (uio->uio_resid == 0)
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return (0);
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if (ioflag & IO_APPEND)
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uio_setoffset(uio, fvdat->filesize);
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fdisp_init(&fdi, 0);
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while (uio->uio_resid > 0) {
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chunksize = MIN(uio->uio_resid,
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fuse_get_mpdata(vp->v_mount)->max_write);
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fdi.iosize = sizeof(*fwi) + chunksize;
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fdisp_make_vp(&fdi, FUSE_WRITE, vp, uio->uio_td, cred);
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fwi = fdi.indata;
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fwi->fh = fufh->fh_id;
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fwi->offset = uio->uio_offset;
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fwi->size = chunksize;
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if ((err = uiomove((char *)fdi.indata + sizeof(*fwi),
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chunksize, uio)))
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break;
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if ((err = fdisp_wait_answ(&fdi)))
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break;
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diff = chunksize - ((struct fuse_write_out *)fdi.answ)->size;
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if (diff < 0) {
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err = EINVAL;
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break;
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}
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uio->uio_resid += diff;
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uio->uio_offset -= diff;
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if (uio->uio_offset > fvdat->filesize)
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fuse_vnode_setsize(vp, cred, uio->uio_offset);
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}
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fdisp_destroy(&fdi);
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return (err);
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}
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static int
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fuse_write_biobackend(struct vnode *vp, struct uio *uio,
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struct ucred *cred, struct fuse_filehandle *fufh, int ioflag)
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{
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struct fuse_vnode_data *fvdat = VTOFUD(vp);
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struct buf *bp;
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daddr_t lbn;
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int bcount;
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int n, on, err = 0;
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const int biosize = fuse_iosize(vp);
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KASSERT(uio->uio_rw == UIO_WRITE, ("ncl_write mode"));
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FS_DEBUG("resid=%zx offset=%jx fsize=%jx\n",
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uio->uio_resid, uio->uio_offset, fvdat->filesize);
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if (vp->v_type != VREG)
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return (EIO);
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if (uio->uio_offset < 0)
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return (EINVAL);
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if (uio->uio_resid == 0)
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return (0);
|
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if (ioflag & IO_APPEND)
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uio_setoffset(uio, fvdat->filesize);
|
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|
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/*
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* Find all of this file's B_NEEDCOMMIT buffers. If our writes
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* would exceed the local maximum per-file write commit size when
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* combined with those, we must decide whether to flush,
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* go synchronous, or return err. We don't bother checking
|
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* IO_UNIT -- we just make all writes atomic anyway, as there's
|
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* no point optimizing for something that really won't ever happen.
|
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*/
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do {
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if (fuse_isdeadfs(vp)) {
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err = ENXIO;
|
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break;
|
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}
|
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lbn = uio->uio_offset / biosize;
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on = uio->uio_offset & (biosize - 1);
|
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n = MIN((unsigned)(biosize - on), uio->uio_resid);
|
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|
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FS_DEBUG2G("lbn %ju, on %d, n %d, uio offset %ju, uio resid %zd\n",
|
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(uintmax_t)lbn, on, n,
|
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(uintmax_t)uio->uio_offset, uio->uio_resid);
|
|
|
|
again:
|
|
/*
|
|
* Handle direct append and file extension cases, calculate
|
|
* unaligned buffer size.
|
|
*/
|
|
if (uio->uio_offset == fvdat->filesize && n) {
|
|
/*
|
|
* Get the buffer (in its pre-append state to maintain
|
|
* B_CACHE if it was previously set). Resize the
|
|
* nfsnode after we have locked the buffer to prevent
|
|
* readers from reading garbage.
|
|
*/
|
|
bcount = on;
|
|
FS_DEBUG("getting block from OS, bcount %d\n", bcount);
|
|
bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
|
|
|
|
if (bp != NULL) {
|
|
long save;
|
|
|
|
err = fuse_vnode_setsize(vp, cred,
|
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uio->uio_offset + n);
|
|
if (err) {
|
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brelse(bp);
|
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break;
|
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}
|
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save = bp->b_flags & B_CACHE;
|
|
bcount += n;
|
|
allocbuf(bp, bcount);
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bp->b_flags |= save;
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}
|
|
} else {
|
|
/*
|
|
* Obtain the locked cache block first, and then
|
|
* adjust the file's size as appropriate.
|
|
*/
|
|
bcount = on + n;
|
|
if ((off_t)lbn * biosize + bcount < fvdat->filesize) {
|
|
if ((off_t)(lbn + 1) * biosize < fvdat->filesize)
|
|
bcount = biosize;
|
|
else
|
|
bcount = fvdat->filesize -
|
|
(off_t)lbn *biosize;
|
|
}
|
|
FS_DEBUG("getting block from OS, bcount %d\n", bcount);
|
|
bp = getblk(vp, lbn, bcount, PCATCH, 0, 0);
|
|
if (bp && uio->uio_offset + n > fvdat->filesize) {
|
|
err = fuse_vnode_setsize(vp, cred,
|
|
uio->uio_offset + n);
|
|
if (err) {
|
|
brelse(bp);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!bp) {
|
|
err = EINTR;
|
|
break;
|
|
}
|
|
/*
|
|
* Issue a READ if B_CACHE is not set. In special-append
|
|
* mode, B_CACHE is based on the buffer prior to the write
|
|
* op and is typically set, avoiding the read. If a read
|
|
* is required in special append mode, the server will
|
|
* probably send us a short-read since we extended the file
|
|
* on our end, resulting in b_resid == 0 and, thusly,
|
|
* B_CACHE getting set.
|
|
*
|
|
* We can also avoid issuing the read if the write covers
|
|
* the entire buffer. We have to make sure the buffer state
|
|
* is reasonable in this case since we will not be initiating
|
|
* I/O. See the comments in kern/vfs_bio.c's getblk() for
|
|
* more information.
|
|
*
|
|
* B_CACHE may also be set due to the buffer being cached
|
|
* normally.
|
|
*/
|
|
|
|
if (on == 0 && n == bcount) {
|
|
bp->b_flags |= B_CACHE;
|
|
bp->b_flags &= ~B_INVAL;
|
|
bp->b_ioflags &= ~BIO_ERROR;
|
|
}
|
|
if ((bp->b_flags & B_CACHE) == 0) {
|
|
bp->b_iocmd = BIO_READ;
|
|
vfs_busy_pages(bp, 0);
|
|
fuse_io_strategy(vp, bp);
|
|
if ((err = bp->b_error)) {
|
|
brelse(bp);
|
|
break;
|
|
}
|
|
}
|
|
if (bp->b_wcred == NOCRED)
|
|
bp->b_wcred = crhold(cred);
|
|
|
|
/*
|
|
* If dirtyend exceeds file size, chop it down. This should
|
|
* not normally occur but there is an append race where it
|
|
* might occur XXX, so we log it.
|
|
*
|
|
* If the chopping creates a reverse-indexed or degenerate
|
|
* situation with dirtyoff/end, we 0 both of them.
|
|
*/
|
|
|
|
if (bp->b_dirtyend > bcount) {
|
|
FS_DEBUG("FUSE append race @%lx:%d\n",
|
|
(long)bp->b_blkno * biosize,
|
|
bp->b_dirtyend - bcount);
|
|
bp->b_dirtyend = bcount;
|
|
}
|
|
if (bp->b_dirtyoff >= bp->b_dirtyend)
|
|
bp->b_dirtyoff = bp->b_dirtyend = 0;
|
|
|
|
/*
|
|
* If the new write will leave a contiguous dirty
|
|
* area, just update the b_dirtyoff and b_dirtyend,
|
|
* otherwise force a write rpc of the old dirty area.
|
|
*
|
|
* While it is possible to merge discontiguous writes due to
|
|
* our having a B_CACHE buffer ( and thus valid read data
|
|
* for the hole), we don't because it could lead to
|
|
* significant cache coherency problems with multiple clients,
|
|
* especially if locking is implemented later on.
|
|
*
|
|
* as an optimization we could theoretically maintain
|
|
* a linked list of discontinuous areas, but we would still
|
|
* have to commit them separately so there isn't much
|
|
* advantage to it except perhaps a bit of asynchronization.
|
|
*/
|
|
|
|
if (bp->b_dirtyend > 0 &&
|
|
(on > bp->b_dirtyend || (on + n) < bp->b_dirtyoff)) {
|
|
/*
|
|
* Yes, we mean it. Write out everything to "storage"
|
|
* immediately, without hesitation. (Apart from other
|
|
* reasons: the only way to know if a write is valid
|
|
* if its actually written out.)
|
|
*/
|
|
bwrite(bp);
|
|
if (bp->b_error == EINTR) {
|
|
err = EINTR;
|
|
break;
|
|
}
|
|
goto again;
|
|
}
|
|
err = uiomove((char *)bp->b_data + on, n, uio);
|
|
|
|
/*
|
|
* Since this block is being modified, it must be written
|
|
* again and not just committed. Since write clustering does
|
|
* not work for the stage 1 data write, only the stage 2
|
|
* commit rpc, we have to clear B_CLUSTEROK as well.
|
|
*/
|
|
bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK);
|
|
|
|
if (err) {
|
|
bp->b_ioflags |= BIO_ERROR;
|
|
bp->b_error = err;
|
|
brelse(bp);
|
|
break;
|
|
}
|
|
/*
|
|
* Only update dirtyoff/dirtyend if not a degenerate
|
|
* condition.
|
|
*/
|
|
if (n) {
|
|
if (bp->b_dirtyend > 0) {
|
|
bp->b_dirtyoff = MIN(on, bp->b_dirtyoff);
|
|
bp->b_dirtyend = MAX((on + n), bp->b_dirtyend);
|
|
} else {
|
|
bp->b_dirtyoff = on;
|
|
bp->b_dirtyend = on + n;
|
|
}
|
|
vfs_bio_set_valid(bp, on, n);
|
|
}
|
|
err = bwrite(bp);
|
|
if (err)
|
|
break;
|
|
} while (uio->uio_resid > 0 && n > 0);
|
|
|
|
if (fuse_sync_resize && (fvdat->flag & FN_SIZECHANGE) != 0)
|
|
fuse_vnode_savesize(vp, cred);
|
|
|
|
return (err);
|
|
}
|
|
|
|
int
|
|
fuse_io_strategy(struct vnode *vp, struct buf *bp)
|
|
{
|
|
struct fuse_filehandle *fufh;
|
|
struct fuse_vnode_data *fvdat = VTOFUD(vp);
|
|
struct ucred *cred;
|
|
struct uio *uiop;
|
|
struct uio uio;
|
|
struct iovec io;
|
|
int error = 0;
|
|
|
|
const int biosize = fuse_iosize(vp);
|
|
|
|
MPASS(vp->v_type == VREG || vp->v_type == VDIR);
|
|
MPASS(bp->b_iocmd == BIO_READ || bp->b_iocmd == BIO_WRITE);
|
|
FS_DEBUG("inode=%ju offset=%jd resid=%ld\n",
|
|
(uintmax_t)VTOI(vp), (intmax_t)(((off_t)bp->b_blkno) * biosize),
|
|
bp->b_bcount);
|
|
|
|
error = fuse_filehandle_getrw(vp,
|
|
(bp->b_iocmd == BIO_READ) ? FUFH_RDONLY : FUFH_WRONLY, &fufh);
|
|
if (error) {
|
|
printf("FUSE: strategy: filehandles are closed\n");
|
|
bp->b_ioflags |= BIO_ERROR;
|
|
bp->b_error = error;
|
|
return (error);
|
|
}
|
|
cred = bp->b_iocmd == BIO_READ ? bp->b_rcred : bp->b_wcred;
|
|
|
|
uiop = &uio;
|
|
uiop->uio_iov = &io;
|
|
uiop->uio_iovcnt = 1;
|
|
uiop->uio_segflg = UIO_SYSSPACE;
|
|
uiop->uio_td = curthread;
|
|
|
|
/*
|
|
* clear BIO_ERROR and B_INVAL state prior to initiating the I/O. We
|
|
* do this here so we do not have to do it in all the code that
|
|
* calls us.
|
|
*/
|
|
bp->b_flags &= ~B_INVAL;
|
|
bp->b_ioflags &= ~BIO_ERROR;
|
|
|
|
KASSERT(!(bp->b_flags & B_DONE),
|
|
("fuse_io_strategy: bp %p already marked done", bp));
|
|
if (bp->b_iocmd == BIO_READ) {
|
|
io.iov_len = uiop->uio_resid = bp->b_bcount;
|
|
io.iov_base = bp->b_data;
|
|
uiop->uio_rw = UIO_READ;
|
|
|
|
uiop->uio_offset = ((off_t)bp->b_blkno) * biosize;
|
|
error = fuse_read_directbackend(vp, uiop, cred, fufh);
|
|
|
|
if ((!error && uiop->uio_resid) ||
|
|
(fsess_opt_brokenio(vnode_mount(vp)) && error == EIO &&
|
|
uiop->uio_offset < fvdat->filesize && fvdat->filesize > 0 &&
|
|
uiop->uio_offset >= fvdat->cached_attrs.va_size)) {
|
|
/*
|
|
* If we had a short read with no error, we must have
|
|
* hit a file hole. We should zero-fill the remainder.
|
|
* This can also occur if the server hits the file EOF.
|
|
*
|
|
* Holes used to be able to occur due to pending
|
|
* writes, but that is not possible any longer.
|
|
*/
|
|
int nread = bp->b_bcount - uiop->uio_resid;
|
|
int left = uiop->uio_resid;
|
|
|
|
if (error != 0) {
|
|
printf("FUSE: Fix broken io: offset %ju, "
|
|
" resid %zd, file size %ju/%ju\n",
|
|
(uintmax_t)uiop->uio_offset,
|
|
uiop->uio_resid, fvdat->filesize,
|
|
fvdat->cached_attrs.va_size);
|
|
error = 0;
|
|
}
|
|
if (left > 0)
|
|
bzero((char *)bp->b_data + nread, left);
|
|
uiop->uio_resid = 0;
|
|
}
|
|
if (error) {
|
|
bp->b_ioflags |= BIO_ERROR;
|
|
bp->b_error = error;
|
|
}
|
|
} else {
|
|
/*
|
|
* If we only need to commit, try to commit
|
|
*/
|
|
if (bp->b_flags & B_NEEDCOMMIT) {
|
|
FS_DEBUG("write: B_NEEDCOMMIT flags set\n");
|
|
}
|
|
/*
|
|
* Setup for actual write
|
|
*/
|
|
if ((off_t)bp->b_blkno * biosize + bp->b_dirtyend >
|
|
fvdat->filesize)
|
|
bp->b_dirtyend = fvdat->filesize -
|
|
(off_t)bp->b_blkno * biosize;
|
|
|
|
if (bp->b_dirtyend > bp->b_dirtyoff) {
|
|
io.iov_len = uiop->uio_resid = bp->b_dirtyend
|
|
- bp->b_dirtyoff;
|
|
uiop->uio_offset = (off_t)bp->b_blkno * biosize
|
|
+ bp->b_dirtyoff;
|
|
io.iov_base = (char *)bp->b_data + bp->b_dirtyoff;
|
|
uiop->uio_rw = UIO_WRITE;
|
|
|
|
error = fuse_write_directbackend(vp, uiop, cred, fufh, 0);
|
|
|
|
if (error == EINTR || error == ETIMEDOUT
|
|
|| (!error && (bp->b_flags & B_NEEDCOMMIT))) {
|
|
|
|
bp->b_flags &= ~(B_INVAL | B_NOCACHE);
|
|
if ((bp->b_flags & B_PAGING) == 0) {
|
|
bdirty(bp);
|
|
bp->b_flags &= ~B_DONE;
|
|
}
|
|
if ((error == EINTR || error == ETIMEDOUT) &&
|
|
(bp->b_flags & B_ASYNC) == 0)
|
|
bp->b_flags |= B_EINTR;
|
|
} else {
|
|
if (error) {
|
|
bp->b_ioflags |= BIO_ERROR;
|
|
bp->b_flags |= B_INVAL;
|
|
bp->b_error = error;
|
|
}
|
|
bp->b_dirtyoff = bp->b_dirtyend = 0;
|
|
}
|
|
} else {
|
|
bp->b_resid = 0;
|
|
bufdone(bp);
|
|
return (0);
|
|
}
|
|
}
|
|
bp->b_resid = uiop->uio_resid;
|
|
bufdone(bp);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
fuse_io_flushbuf(struct vnode *vp, int waitfor, struct thread *td)
|
|
{
|
|
struct vop_fsync_args a = {
|
|
.a_vp = vp,
|
|
.a_waitfor = waitfor,
|
|
.a_td = td,
|
|
};
|
|
|
|
return (vop_stdfsync(&a));
|
|
}
|
|
|
|
/*
|
|
* Flush and invalidate all dirty buffers. If another process is already
|
|
* doing the flush, just wait for completion.
|
|
*/
|
|
int
|
|
fuse_io_invalbuf(struct vnode *vp, struct thread *td)
|
|
{
|
|
struct fuse_vnode_data *fvdat = VTOFUD(vp);
|
|
int error = 0;
|
|
|
|
if (vp->v_iflag & VI_DOOMED)
|
|
return 0;
|
|
|
|
ASSERT_VOP_ELOCKED(vp, "fuse_io_invalbuf");
|
|
|
|
while (fvdat->flag & FN_FLUSHINPROG) {
|
|
struct proc *p = td->td_proc;
|
|
|
|
if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF)
|
|
return EIO;
|
|
fvdat->flag |= FN_FLUSHWANT;
|
|
tsleep(&fvdat->flag, PRIBIO + 2, "fusevinv", 2 * hz);
|
|
error = 0;
|
|
if (p != NULL) {
|
|
PROC_LOCK(p);
|
|
if (SIGNOTEMPTY(p->p_siglist) ||
|
|
SIGNOTEMPTY(td->td_siglist))
|
|
error = EINTR;
|
|
PROC_UNLOCK(p);
|
|
}
|
|
if (error == EINTR)
|
|
return EINTR;
|
|
}
|
|
fvdat->flag |= FN_FLUSHINPROG;
|
|
|
|
if (vp->v_bufobj.bo_object != NULL) {
|
|
VM_OBJECT_WLOCK(vp->v_bufobj.bo_object);
|
|
vm_object_page_clean(vp->v_bufobj.bo_object, 0, 0, OBJPC_SYNC);
|
|
VM_OBJECT_WUNLOCK(vp->v_bufobj.bo_object);
|
|
}
|
|
error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
|
|
while (error) {
|
|
if (error == ERESTART || error == EINTR) {
|
|
fvdat->flag &= ~FN_FLUSHINPROG;
|
|
if (fvdat->flag & FN_FLUSHWANT) {
|
|
fvdat->flag &= ~FN_FLUSHWANT;
|
|
wakeup(&fvdat->flag);
|
|
}
|
|
return EINTR;
|
|
}
|
|
error = vinvalbuf(vp, V_SAVE, PCATCH, 0);
|
|
}
|
|
fvdat->flag &= ~FN_FLUSHINPROG;
|
|
if (fvdat->flag & FN_FLUSHWANT) {
|
|
fvdat->flag &= ~FN_FLUSHWANT;
|
|
wakeup(&fvdat->flag);
|
|
}
|
|
return (error);
|
|
}
|