freebsd-dev/sys/fs/fuse/fuse_internal.c
Attilio Rao d9454fab30 - Current caching mode is completely broken because it simply relies
on timing of the operations and not real lookup, bringing too many
  false positives. Remove the whole mechanism. If it needs to be
  implemented, next time it should really be done in the proper way.
- Fix VOP_GETATTR() in order to cope with userland bugs that would
  change the type of file and not panic. Instead it gets the entry as
  if it is not existing.

Reported and tested by:	flo
MFC after:	2 months
X-MFC:		241519, 242536,242616
2012-11-08 00:32:49 +00:00

650 lines
15 KiB
C

/*
* 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/mutex.h>
#include <sys/sx.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/stat.h>
#include <sys/unistd.h>
#include <sys/filedesc.h>
#include <sys/file.h>
#include <sys/fcntl.h>
#include <sys/dirent.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/sysctl.h>
#include <sys/priv.h>
#include "fuse.h"
#include "fuse_file.h"
#include "fuse_internal.h"
#include "fuse_ipc.h"
#include "fuse_node.h"
#include "fuse_file.h"
#include "fuse_param.h"
#define FUSE_DEBUG_MODULE INTERNAL
#include "fuse_debug.h"
#ifdef ZERO_PAD_INCOMPLETE_BUFS
static int isbzero(void *buf, size_t len);
#endif
/* access */
int
fuse_internal_access(struct vnode *vp,
mode_t mode,
struct fuse_access_param *facp,
struct thread *td,
struct ucred *cred)
{
int err = 0;
uint32_t mask = 0;
int dataflags;
int vtype;
struct mount *mp;
struct fuse_dispatcher fdi;
struct fuse_access_in *fai;
struct fuse_data *data;
/* NOT YET DONE */
/*
* If this vnop gives you trouble, just return 0 here for a lazy
* kludge.
*/
/* return 0;*/
fuse_trace_printf_func();
mp = vnode_mount(vp);
vtype = vnode_vtype(vp);
data = fuse_get_mpdata(mp);
dataflags = data->dataflags;
if ((mode & VWRITE) && vfs_isrdonly(mp)) {
return EACCES;
}
/* Unless explicitly permitted, deny everyone except the fs owner. */
if (vnode_isvroot(vp) && !(facp->facc_flags & FACCESS_NOCHECKSPY)) {
if (!(dataflags & FSESS_DAEMON_CAN_SPY)) {
int denied = fuse_match_cred(data->daemoncred,
cred);
if (denied) {
return EPERM;
}
}
facp->facc_flags |= FACCESS_NOCHECKSPY;
}
if (!(facp->facc_flags & FACCESS_DO_ACCESS)) {
return 0;
}
if (((vtype == VREG) && (mode & VEXEC))) {
#ifdef NEED_MOUNT_ARGUMENT_FOR_THIS
/* Let the kernel handle this through open / close heuristics.*/
return ENOTSUP;
#else
/* Let the kernel handle this. */
return 0;
#endif
}
if (!fsess_isimpl(mp, FUSE_ACCESS)) {
/* Let the kernel handle this. */
return 0;
}
if (dataflags & FSESS_DEFAULT_PERMISSIONS) {
/* Let the kernel handle this. */
return 0;
}
if ((mode & VADMIN) != 0) {
err = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
if (err) {
return err;
}
}
if ((mode & (VWRITE | VAPPEND | VADMIN)) != 0) {
mask |= W_OK;
}
if ((mode & VREAD) != 0) {
mask |= R_OK;
}
if ((mode & VEXEC) != 0) {
mask |= X_OK;
}
bzero(&fdi, sizeof(fdi));
fdisp_init(&fdi, sizeof(*fai));
fdisp_make_vp(&fdi, FUSE_ACCESS, vp, td, cred);
fai = fdi.indata;
fai->mask = F_OK;
fai->mask |= mask;
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_ACCESS);
err = 0;
}
return err;
}
/* fsync */
int
fuse_internal_fsync_callback(struct fuse_ticket *tick, struct uio *uio)
{
fuse_trace_printf_func();
if (tick->tk_aw_ohead.error == ENOSYS) {
fsess_set_notimpl(tick->tk_data->mp, fticket_opcode(tick));
}
return 0;
}
int
fuse_internal_fsync(struct vnode *vp,
struct thread *td,
struct ucred *cred,
struct fuse_filehandle *fufh)
{
int op = FUSE_FSYNC;
struct fuse_fsync_in *ffsi;
struct fuse_dispatcher fdi;
fuse_trace_printf_func();
if (vnode_isdir(vp)) {
op = FUSE_FSYNCDIR;
}
fdisp_init(&fdi, sizeof(*ffsi));
fdisp_make_vp(&fdi, op, vp, td, cred);
ffsi = fdi.indata;
ffsi->fh = fufh->fh_id;
ffsi->fsync_flags = 1; /* datasync */
fuse_insert_callback(fdi.tick, fuse_internal_fsync_callback);
fuse_insert_message(fdi.tick);
fdisp_destroy(&fdi);
return 0;
}
/* readdir */
int
fuse_internal_readdir(struct vnode *vp,
struct uio *uio,
struct fuse_filehandle *fufh,
struct fuse_iov *cookediov)
{
int err = 0;
struct fuse_dispatcher fdi;
struct fuse_read_in *fri;
if (uio_resid(uio) == 0) {
return 0;
}
fdisp_init(&fdi, 0);
/*
* Note that we DO NOT have a UIO_SYSSPACE here (so no need for p2p
* I/O).
*/
while (uio_resid(uio) > 0) {
fdi.iosize = sizeof(*fri);
fdisp_make_vp(&fdi, FUSE_READDIR, vp, NULL, NULL);
fri = fdi.indata;
fri->fh = fufh->fh_id;
fri->offset = uio_offset(uio);
fri->size = min(uio_resid(uio), FUSE_DEFAULT_IOSIZE);
/* mp->max_read */
if ((err = fdisp_wait_answ(&fdi))) {
break;
}
if ((err = fuse_internal_readdir_processdata(uio, fri->size, fdi.answ,
fdi.iosize, cookediov))) {
break;
}
}
fdisp_destroy(&fdi);
return ((err == -1) ? 0 : err);
}
int
fuse_internal_readdir_processdata(struct uio *uio,
size_t reqsize,
void *buf,
size_t bufsize,
void *param)
{
int err = 0;
int cou = 0;
int bytesavail;
size_t freclen;
struct dirent *de;
struct fuse_dirent *fudge;
struct fuse_iov *cookediov = param;
if (bufsize < FUSE_NAME_OFFSET) {
return -1;
}
for (;;) {
if (bufsize < FUSE_NAME_OFFSET) {
err = -1;
break;
}
fudge = (struct fuse_dirent *)buf;
freclen = FUSE_DIRENT_SIZE(fudge);
cou++;
if (bufsize < freclen) {
err = ((cou == 1) ? -1 : 0);
break;
}
#ifdef ZERO_PAD_INCOMPLETE_BUFS
if (isbzero(buf, FUSE_NAME_OFFSET)) {
err = -1;
break;
}
#endif
if (!fudge->namelen || fudge->namelen > MAXNAMLEN) {
err = EINVAL;
break;
}
bytesavail = GENERIC_DIRSIZ((struct pseudo_dirent *)
&fudge->namelen);
if (bytesavail > uio_resid(uio)) {
err = -1;
break;
}
fiov_refresh(cookediov);
fiov_adjust(cookediov, bytesavail);
de = (struct dirent *)cookediov->base;
de->d_fileno = fudge->ino; /* XXX: truncation */
de->d_reclen = bytesavail;
de->d_type = fudge->type;
de->d_namlen = fudge->namelen;
memcpy((char *)cookediov->base + sizeof(struct dirent) -
MAXNAMLEN - 1,
(char *)buf + FUSE_NAME_OFFSET, fudge->namelen);
((char *)cookediov->base)[bytesavail] = '\0';
err = uiomove(cookediov->base, cookediov->len, uio);
if (err) {
break;
}
buf = (char *)buf + freclen;
bufsize -= freclen;
uio_setoffset(uio, fudge->off);
}
return err;
}
/* remove */
#define INVALIDATE_CACHED_VATTRS_UPON_UNLINK 1
int
fuse_internal_remove(struct vnode *dvp,
struct vnode *vp,
struct componentname *cnp,
enum fuse_opcode op)
{
struct fuse_dispatcher fdi;
struct vattr *vap = VTOVA(vp);
#if INVALIDATE_CACHED_VATTRS_UPON_UNLINK
int need_invalidate = 0;
uint64_t target_nlink = 0;
#endif
int err = 0;
debug_printf("dvp=%p, cnp=%p, op=%d\n", vp, cnp, op);
fdisp_init(&fdi, cnp->cn_namelen + 1);
fdisp_make_vp(&fdi, op, dvp, cnp->cn_thread, cnp->cn_cred);
memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
((char *)fdi.indata)[cnp->cn_namelen] = '\0';
#if INVALIDATE_CACHED_VATTRS_UPON_UNLINK
if (vap->va_nlink > 1) {
need_invalidate = 1;
target_nlink = vap->va_nlink;
}
#endif
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
return err;
}
/* rename */
int
fuse_internal_rename(struct vnode *fdvp,
struct componentname *fcnp,
struct vnode *tdvp,
struct componentname *tcnp)
{
struct fuse_dispatcher fdi;
struct fuse_rename_in *fri;
int err = 0;
fdisp_init(&fdi, sizeof(*fri) + fcnp->cn_namelen + tcnp->cn_namelen + 2);
fdisp_make_vp(&fdi, FUSE_RENAME, fdvp, tcnp->cn_thread, tcnp->cn_cred);
fri = fdi.indata;
fri->newdir = VTOI(tdvp);
memcpy((char *)fdi.indata + sizeof(*fri), fcnp->cn_nameptr,
fcnp->cn_namelen);
((char *)fdi.indata)[sizeof(*fri) + fcnp->cn_namelen] = '\0';
memcpy((char *)fdi.indata + sizeof(*fri) + fcnp->cn_namelen + 1,
tcnp->cn_nameptr, tcnp->cn_namelen);
((char *)fdi.indata)[sizeof(*fri) + fcnp->cn_namelen +
tcnp->cn_namelen + 1] = '\0';
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
return err;
}
/* strategy */
/* entity creation */
void
fuse_internal_newentry_makerequest(struct mount *mp,
uint64_t dnid,
struct componentname *cnp,
enum fuse_opcode op,
void *buf,
size_t bufsize,
struct fuse_dispatcher *fdip)
{
debug_printf("fdip=%p\n", fdip);
fdip->iosize = bufsize + cnp->cn_namelen + 1;
fdisp_make(fdip, op, mp, dnid, cnp->cn_thread, cnp->cn_cred);
memcpy(fdip->indata, buf, bufsize);
memcpy((char *)fdip->indata + bufsize, cnp->cn_nameptr, cnp->cn_namelen);
((char *)fdip->indata)[bufsize + cnp->cn_namelen] = '\0';
}
int
fuse_internal_newentry_core(struct vnode *dvp,
struct vnode **vpp,
struct componentname *cnp,
enum vtype vtyp,
struct fuse_dispatcher *fdip)
{
int err = 0;
struct fuse_entry_out *feo;
struct mount *mp = vnode_mount(dvp);
if ((err = fdisp_wait_answ(fdip))) {
return err;
}
feo = fdip->answ;
if ((err = fuse_internal_checkentry(feo, vtyp))) {
return err;
}
err = fuse_vnode_get(mp, feo->nodeid, dvp, vpp, cnp, vtyp);
if (err) {
fuse_internal_forget_send(mp, cnp->cn_thread, cnp->cn_cred,
feo->nodeid, 1);
return err;
}
cache_attrs(*vpp, feo);
return err;
}
int
fuse_internal_newentry(struct vnode *dvp,
struct vnode **vpp,
struct componentname *cnp,
enum fuse_opcode op,
void *buf,
size_t bufsize,
enum vtype vtype)
{
int err;
struct fuse_dispatcher fdi;
struct mount *mp = vnode_mount(dvp);
fdisp_init(&fdi, 0);
fuse_internal_newentry_makerequest(mp, VTOI(dvp), cnp, op, buf,
bufsize, &fdi);
err = fuse_internal_newentry_core(dvp, vpp, cnp, vtype, &fdi);
fdisp_destroy(&fdi);
return err;
}
/* entity destruction */
int
fuse_internal_forget_callback(struct fuse_ticket *ftick, struct uio *uio)
{
fuse_internal_forget_send(ftick->tk_data->mp, curthread, NULL,
((struct fuse_in_header *)ftick->tk_ms_fiov.base)->nodeid, 1);
return 0;
}
void
fuse_internal_forget_send(struct mount *mp,
struct thread *td,
struct ucred *cred,
uint64_t nodeid,
uint64_t nlookup)
{
struct fuse_dispatcher fdi;
struct fuse_forget_in *ffi;
debug_printf("mp=%p, nodeid=%ju, nlookup=%ju\n",
mp, (uintmax_t)nodeid, (uintmax_t)nlookup);
/*
* KASSERT(nlookup > 0, ("zero-times forget for vp #%llu",
* (long long unsigned) nodeid));
*/
fdisp_init(&fdi, sizeof(*ffi));
fdisp_make(&fdi, FUSE_FORGET, mp, nodeid, td, cred);
ffi = fdi.indata;
ffi->nlookup = nlookup;
fuse_insert_message(fdi.tick);
fdisp_destroy(&fdi);
}
void
fuse_internal_vnode_disappear(struct vnode *vp)
{
struct fuse_vnode_data *fvdat = VTOFUD(vp);
ASSERT_VOP_ELOCKED(vp, "fuse_internal_vnode_disappear");
fvdat->flag |= FN_REVOKED;
cache_purge(vp);
}
/* fuse start/stop */
int
fuse_internal_init_callback(struct fuse_ticket *tick, struct uio *uio)
{
int err = 0;
struct fuse_data *data = tick->tk_data;
struct fuse_init_out *fiio;
if ((err = tick->tk_aw_ohead.error)) {
goto out;
}
if ((err = fticket_pull(tick, uio))) {
goto out;
}
fiio = fticket_resp(tick)->base;
/* XXX: Do we want to check anything further besides this? */
if (fiio->major < 7) {
debug_printf("userpace version too low\n");
err = EPROTONOSUPPORT;
goto out;
}
data->fuse_libabi_major = fiio->major;
data->fuse_libabi_minor = fiio->minor;
if (fuse_libabi_geq(data, 7, 5)) {
if (fticket_resp(tick)->len == sizeof(struct fuse_init_out)) {
data->max_write = fiio->max_write;
} else {
err = EINVAL;
}
} else {
/* Old fix values */
data->max_write = 4096;
}
out:
if (err) {
fdata_set_dead(data);
}
FUSE_LOCK();
data->dataflags |= FSESS_INITED;
wakeup(&data->ticketer);
FUSE_UNLOCK();
return 0;
}
void
fuse_internal_send_init(struct fuse_data *data, struct thread *td)
{
struct fuse_init_in *fiii;
struct fuse_dispatcher fdi;
fdisp_init(&fdi, sizeof(*fiii));
fdisp_make(&fdi, FUSE_INIT, data->mp, 0, td, NULL);
fiii = fdi.indata;
fiii->major = FUSE_KERNEL_VERSION;
fiii->minor = FUSE_KERNEL_MINOR_VERSION;
fiii->max_readahead = FUSE_DEFAULT_IOSIZE * 16;
fiii->flags = 0;
fuse_insert_callback(fdi.tick, fuse_internal_init_callback);
fuse_insert_message(fdi.tick);
fdisp_destroy(&fdi);
}
#ifdef ZERO_PAD_INCOMPLETE_BUFS
static int
isbzero(void *buf, size_t len)
{
int i;
for (i = 0; i < len; i++) {
if (((char *)buf)[i])
return (0);
}
return (1);
}
#endif