freebsd-dev/sys/fs/fuse/fuse_node.c

385 lines
10 KiB
C
Raw Normal View History

/*
* Copyright (c) 2007-2009 Google Inc. and Amit Singh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright (C) 2005 Csaba Henk.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/lock.h>
#include <sys/sx.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/mount.h>
#include <sys/sysctl.h>
#include <sys/fcntl.h>
#include <sys/fnv_hash.h>
#include <sys/priv.h>
#include <security/mac/mac_framework.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include "fuse.h"
#include "fuse_node.h"
#include "fuse_internal.h"
#include "fuse_io.h"
#include "fuse_ipc.h"
#define FUSE_DEBUG_MODULE VNOPS
#include "fuse_debug.h"
MALLOC_DEFINE(M_FUSEVN, "fuse_vnode", "fuse vnode private data");
static int fuse_node_count = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, node_count, CTLFLAG_RD,
&fuse_node_count, 0, "");
int fuse_data_cache_enable = 1;
SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_enable, CTLFLAG_RW,
&fuse_data_cache_enable, 0, "");
int fuse_data_cache_invalidate = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, data_cache_invalidate, CTLFLAG_RW,
&fuse_data_cache_invalidate, 0, "");
int fuse_mmap_enable = 1;
SYSCTL_INT(_vfs_fuse, OID_AUTO, mmap_enable, CTLFLAG_RW,
&fuse_mmap_enable, 0, "");
int fuse_refresh_size = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, refresh_size, CTLFLAG_RW,
&fuse_refresh_size, 0, "");
int fuse_sync_resize = 1;
SYSCTL_INT(_vfs_fuse, OID_AUTO, sync_resize, CTLFLAG_RW,
&fuse_sync_resize, 0, "");
int fuse_fix_broken_io = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, fix_broken_io, CTLFLAG_RW,
&fuse_fix_broken_io, 0, "");
static void
fuse_vnode_init(struct vnode *vp, struct fuse_vnode_data *fvdat,
uint64_t nodeid, enum vtype vtyp)
{
int i;
fvdat->nid = nodeid;
if (nodeid == FUSE_ROOT_ID) {
vp->v_vflag |= VV_ROOT;
}
vp->v_type = vtyp;
vp->v_data = fvdat;
for (i = 0; i < FUFH_MAXTYPE; i++)
fvdat->fufh[i].fh_type = FUFH_INVALID;
atomic_add_acq_int(&fuse_node_count, 1);
}
void
fuse_vnode_destroy(struct vnode *vp)
{
struct fuse_vnode_data *fvdat = vp->v_data;
vp->v_data = NULL;
free(fvdat, M_FUSEVN);
atomic_subtract_acq_int(&fuse_node_count, 1);
}
static int
fuse_vnode_cmp(struct vnode *vp, void *nidp)
{
return (VTOI(vp) != *((uint64_t *)nidp));
}
static uint32_t __inline
fuse_vnode_hash(uint64_t id)
{
return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT));
}
static int
fuse_vnode_alloc(struct mount *mp,
struct thread *td,
uint64_t nodeid,
enum vtype vtyp,
struct vnode **vpp)
{
struct fuse_vnode_data *fvdat;
struct vnode *vp2;
int err = 0;
DEBUG("been asked for vno #%ju\n", (uintmax_t)nodeid);
if (vtyp == VNON) {
return EINVAL;
}
*vpp = NULL;
err = vfs_hash_get(mp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE, td, vpp,
fuse_vnode_cmp, &nodeid);
if (err)
return (err);
if (*vpp) {
MPASS((*vpp)->v_type == vtyp && (*vpp)->v_data != NULL);
DEBUG("vnode taken from hash\n");
return (0);
}
fvdat = malloc(sizeof(*fvdat), M_FUSEVN, M_WAITOK | M_ZERO);
err = getnewvnode("fuse", mp, &fuse_vnops, vpp);
if (err) {
free(fvdat, M_FUSEVN);
return (err);
}
lockmgr((*vpp)->v_vnlock, LK_EXCLUSIVE, NULL);
fuse_vnode_init(*vpp, fvdat, nodeid, vtyp);
err = insmntque(*vpp, mp);
ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
if (err) {
free(fvdat, M_FUSEVN);
*vpp = NULL;
return (err);
}
err = vfs_hash_insert(*vpp, fuse_vnode_hash(nodeid), LK_EXCLUSIVE,
td, &vp2, fuse_vnode_cmp, &nodeid);
if (err)
return (err);
if (vp2 != NULL) {
*vpp = vp2;
return (0);
}
ASSERT_VOP_ELOCKED(*vpp, "fuse_vnode_alloc");
return (0);
}
int
fuse_vnode_get(struct mount *mp,
uint64_t nodeid,
struct vnode *dvp,
struct vnode **vpp,
struct componentname *cnp,
enum vtype vtyp)
{
struct thread *td = (cnp != NULL ? cnp->cn_thread : curthread);
int err = 0;
debug_printf("dvp=%p\n", dvp);
err = fuse_vnode_alloc(mp, td, nodeid, vtyp, vpp);
if (err) {
return err;
}
if (dvp != NULL) {
MPASS((cnp->cn_flags & ISDOTDOT) == 0);
MPASS(!(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.'));
fuse_vnode_setparent(*vpp, dvp);
}
if (dvp != NULL && cnp != NULL && (cnp->cn_flags & MAKEENTRY) != 0) {
ASSERT_VOP_LOCKED(*vpp, "fuse_vnode_get");
ASSERT_VOP_LOCKED(dvp, "fuse_vnode_get");
cache_enter(dvp, *vpp, cnp);
}
/*
* In userland, libfuse uses cached lookups for dot and dotdot entries,
* thus it does not really bump the nlookup counter for forget.
* Follow the same semantic and avoid tu bump it in order to keep
* nlookup counters consistent.
*/
if (cnp == NULL || ((cnp->cn_flags & ISDOTDOT) == 0 &&
(cnp->cn_namelen != 1 || cnp->cn_nameptr[0] != '.')))
VTOFUD(*vpp)->nlookup++;
return 0;
}
void
fuse_vnode_open(struct vnode *vp, int32_t fuse_open_flags, struct thread *td)
{
/*
* Funcation is called for every vnode open.
* Merge fuse_open_flags it may be 0
*
* XXXIP: Handle FOPEN_DIRECT_IO and FOPEN_KEEP_CACHE
*/
if (vnode_vtype(vp) == VREG) {
/* XXXIP prevent getattr, by using cached node size */
vnode_create_vobject(vp, 0, td);
}
}
int
fuse_isvalid_attr(struct vnode *vp)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct timespec uptsp;
nanouptime(&uptsp);
return fuse_timespec_cmp(&uptsp, &fvdat->cached_attrs_valid, <=);
}
int
fuse_vnode_savesize(struct vnode *vp, struct ucred *cred)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct thread *td = curthread;
struct fuse_filehandle *fufh = NULL;
struct fuse_dispatcher fdi;
struct fuse_setattr_in *fsai;
int err = 0;
DEBUG("inode=%ju size=%ju\n", (uintmax_t)VTOI(vp),
(uintmax_t)fvdat->filesize);
ASSERT_VOP_ELOCKED(vp, "fuse_io_extend");
if (fuse_isdeadfs(vp)) {
return EBADF;
}
if (vnode_vtype(vp) == VDIR) {
return EISDIR;
}
if (vfs_isrdonly(vnode_mount(vp))) {
return EROFS;
}
if (cred == NULL) {
cred = td->td_ucred;
}
fdisp_init(&fdi, sizeof(*fsai));
fdisp_make_vp(&fdi, FUSE_SETATTR, vp, td, cred);
fsai = fdi.indata;
fsai->valid = 0;
/* Truncate to a new value. */
fsai->size = fvdat->filesize;
fsai->valid |= FATTR_SIZE;
fuse_filehandle_getrw(vp, FUFH_WRONLY, &fufh);
if (fufh) {
fsai->fh = fufh->fh_id;
fsai->valid |= FATTR_FH;
}
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
if (err == 0)
fvdat->flag &= ~FN_SIZECHANGE;
fuse_invalidate_attr(vp);
return err;
}
void
fuse_vnode_refreshsize(struct vnode *vp, struct ucred *cred)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct vattr va;
if ((fvdat->flag & FN_SIZECHANGE) != 0 ||
(fuse_refresh_size == 0 && fvdat->filesize != 0) ||
fuse_isvalid_attr(vp))
return;
VOP_GETATTR(vp, &va, cred);
DEBUG("refreshed file size: %jd\n", (intmax_t)VTOFUD(vp)->filesize);
}
int
fuse_vnode_setsize(struct vnode *vp, struct ucred *cred, off_t newsize)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
off_t oldsize;
int err = 0;
DEBUG("inode=%ju oldsize=%ju newsize=%ju\n",
(uintmax_t)VTOI(vp), (uintmax_t)fvdat->filesize,
(uintmax_t)newsize);
ASSERT_VOP_ELOCKED(vp, "fuse_vnode_setsize");
oldsize = fvdat->filesize;
fvdat->filesize = newsize;
fvdat->flag |= FN_SIZECHANGE;
if (newsize < oldsize) {
err = vtruncbuf(vp, cred, newsize, fuse_iosize(vp));
}
vnode_pager_setsize(vp, newsize);
fuse_invalidate_attr(vp);
return err;
}