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freebsd-dev/sys/fs/fuse/fuse_vnops.c
Alan Somers bfcb817bcd Fix issues with FUSE_ACCESS when default_permissions is disabled 
This patch fixes two issues relating to FUSE_ACCESS when the
default_permissions mount option is disabled:

* VOP_ACCESS() calls with VADMIN set should never be sent to a fuse server
  in the form of FUSE_ACCESS operations. The FUSE protocol has no equivalent
  of VADMIN, so we must evaluate such things kernel-side, regardless of the
  default_permissions setting.

* The FUSE protocol only requires FUSE_ACCESS to be sent for two purposes:
  for the access(2) syscall and to check directory permissions for
  searchability during lookup. FreeBSD sends it much more frequently, due to
  differences between our VFS and Linux's, for which FUSE was designed. But
  this patch does eliminate several cases not required by the FUSE protocol:

  * for any FUSE_*XATTR operation
  * when creating a new file
  * when deleting a file
  * when setting timestamps, such as by utimensat(2).

* Additionally, when default_permissions is disabled, this patch removes one
  FUSE_GETATTR operation when deleting a file.

PR:		245689
Reported by:	MooseFS FreeBSD Team <freebsd@moosefs.pro>
Reviewed by:	cem
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D24777
2020-05-22 18:11:17 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*
* Copyright (c) 2019 The FreeBSD Foundation
*
* Portions of this software were developed by BFF Storage Systems, LLC under
* sponsorship from the FreeBSD Foundation.
*
* 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/param.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/sx.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/extattr.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/vmmeter.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_param.h>
#include <vm/vm_object.h>
#include <vm/vm_pager.h>
#include <vm/vnode_pager.h>
#include <vm/vm_object.h>
#include "fuse.h"
#include "fuse_file.h"
#include "fuse_internal.h"
#include "fuse_ipc.h"
#include "fuse_node.h"
#include "fuse_io.h"
#include <sys/priv.h>
/* Maximum number of hardlinks to a single FUSE file */
#define FUSE_LINK_MAX UINT32_MAX
SDT_PROVIDER_DECLARE(fusefs);
/*
* Fuse trace probe:
* arg0: verbosity. Higher numbers give more verbose messages
* arg1: Textual message
*/
SDT_PROBE_DEFINE2(fusefs, , vnops, trace, "int", "char*");
/* vnode ops */
static vop_access_t fuse_vnop_access;
static vop_advlock_t fuse_vnop_advlock;
static vop_bmap_t fuse_vnop_bmap;
static vop_close_t fuse_fifo_close;
static vop_close_t fuse_vnop_close;
static vop_create_t fuse_vnop_create;
static vop_deleteextattr_t fuse_vnop_deleteextattr;
static vop_fdatasync_t fuse_vnop_fdatasync;
static vop_fsync_t fuse_vnop_fsync;
static vop_getattr_t fuse_vnop_getattr;
static vop_getextattr_t fuse_vnop_getextattr;
static vop_inactive_t fuse_vnop_inactive;
static vop_link_t fuse_vnop_link;
static vop_listextattr_t fuse_vnop_listextattr;
static vop_lookup_t fuse_vnop_lookup;
static vop_mkdir_t fuse_vnop_mkdir;
static vop_mknod_t fuse_vnop_mknod;
static vop_open_t fuse_vnop_open;
static vop_pathconf_t fuse_vnop_pathconf;
static vop_read_t fuse_vnop_read;
static vop_readdir_t fuse_vnop_readdir;
static vop_readlink_t fuse_vnop_readlink;
static vop_reclaim_t fuse_vnop_reclaim;
static vop_remove_t fuse_vnop_remove;
static vop_rename_t fuse_vnop_rename;
static vop_rmdir_t fuse_vnop_rmdir;
static vop_setattr_t fuse_vnop_setattr;
static vop_setextattr_t fuse_vnop_setextattr;
static vop_strategy_t fuse_vnop_strategy;
static vop_symlink_t fuse_vnop_symlink;
static vop_write_t fuse_vnop_write;
static vop_getpages_t fuse_vnop_getpages;
static vop_print_t fuse_vnop_print;
static vop_vptofh_t fuse_vnop_vptofh;
struct vop_vector fuse_fifoops = {
.vop_default = &fifo_specops,
.vop_access = fuse_vnop_access,
.vop_close = fuse_fifo_close,
.vop_fsync = fuse_vnop_fsync,
.vop_getattr = fuse_vnop_getattr,
.vop_inactive = fuse_vnop_inactive,
.vop_pathconf = fuse_vnop_pathconf,
.vop_print = fuse_vnop_print,
.vop_read = VOP_PANIC,
.vop_reclaim = fuse_vnop_reclaim,
.vop_setattr = fuse_vnop_setattr,
.vop_write = VOP_PANIC,
.vop_vptofh = fuse_vnop_vptofh,
};
VFS_VOP_VECTOR_REGISTER(fuse_fifoops);
struct vop_vector fuse_vnops = {
.vop_allocate = VOP_EINVAL,
.vop_default = &default_vnodeops,
.vop_access = fuse_vnop_access,
.vop_advlock = fuse_vnop_advlock,
.vop_bmap = fuse_vnop_bmap,
.vop_close = fuse_vnop_close,
.vop_create = fuse_vnop_create,
.vop_deleteextattr = fuse_vnop_deleteextattr,
.vop_fsync = fuse_vnop_fsync,
.vop_fdatasync = fuse_vnop_fdatasync,
.vop_getattr = fuse_vnop_getattr,
.vop_getextattr = fuse_vnop_getextattr,
.vop_inactive = fuse_vnop_inactive,
/*
* TODO: implement vop_ioctl after upgrading to protocol 7.16.
* FUSE_IOCTL was added in 7.11, but 32-bit compat is broken until
* 7.16.
*/
.vop_link = fuse_vnop_link,
.vop_listextattr = fuse_vnop_listextattr,
.vop_lookup = fuse_vnop_lookup,
.vop_mkdir = fuse_vnop_mkdir,
.vop_mknod = fuse_vnop_mknod,
.vop_open = fuse_vnop_open,
.vop_pathconf = fuse_vnop_pathconf,
/*
* TODO: implement vop_poll after upgrading to protocol 7.21.
* FUSE_POLL was added in protocol 7.11, but it's kind of broken until
* 7.21, which adds the ability for the client to choose which poll
* events it wants, and for a client to deregister a file handle
*/
.vop_read = fuse_vnop_read,
.vop_readdir = fuse_vnop_readdir,
.vop_readlink = fuse_vnop_readlink,
.vop_reclaim = fuse_vnop_reclaim,
.vop_remove = fuse_vnop_remove,
.vop_rename = fuse_vnop_rename,
.vop_rmdir = fuse_vnop_rmdir,
.vop_setattr = fuse_vnop_setattr,
.vop_setextattr = fuse_vnop_setextattr,
.vop_strategy = fuse_vnop_strategy,
.vop_symlink = fuse_vnop_symlink,
.vop_write = fuse_vnop_write,
.vop_getpages = fuse_vnop_getpages,
.vop_print = fuse_vnop_print,
.vop_vptofh = fuse_vnop_vptofh,
};
VFS_VOP_VECTOR_REGISTER(fuse_vnops);
uma_zone_t fuse_pbuf_zone;
/* Check permission for extattr operations, much like extattr_check_cred */
static int
fuse_extattr_check_cred(struct vnode *vp, int ns, struct ucred *cred,
struct thread *td, accmode_t accmode)
{
struct mount *mp = vnode_mount(vp);
struct fuse_data *data = fuse_get_mpdata(mp);
int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS;
/*
* Kernel-invoked always succeeds.
*/
if (cred == NOCRED)
return (0);
/*
* Do not allow privileged processes in jail to directly manipulate
* system attributes.
*/
switch (ns) {
case EXTATTR_NAMESPACE_SYSTEM:
if (default_permissions) {
return (priv_check_cred(cred, PRIV_VFS_EXTATTR_SYSTEM));
}
return (0);
case EXTATTR_NAMESPACE_USER:
if (default_permissions) {
return (fuse_internal_access(vp, accmode, td, cred));
}
return (0);
default:
return (EPERM);
}
}
/* Get a filehandle for a directory */
static int
fuse_filehandle_get_dir(struct vnode *vp, struct fuse_filehandle **fufhp,
struct ucred *cred, pid_t pid)
{
if (fuse_filehandle_get(vp, FREAD, fufhp, cred, pid) == 0)
return 0;
return fuse_filehandle_get(vp, FEXEC, fufhp, cred, pid);
}
/* Send FUSE_FLUSH for this vnode */
static int
fuse_flush(struct vnode *vp, struct ucred *cred, pid_t pid, int fflag)
{
struct fuse_flush_in *ffi;
struct fuse_filehandle *fufh;
struct fuse_dispatcher fdi;
struct thread *td = curthread;
struct mount *mp = vnode_mount(vp);
int err;
if (!fsess_isimpl(vnode_mount(vp), FUSE_FLUSH))
return 0;
err = fuse_filehandle_getrw(vp, fflag, &fufh, cred, pid);
if (err)
return err;
fdisp_init(&fdi, sizeof(*ffi));
fdisp_make_vp(&fdi, FUSE_FLUSH, vp, td, cred);
ffi = fdi.indata;
ffi->fh = fufh->fh_id;
/*
* If the file has a POSIX lock then we're supposed to set lock_owner.
* If not, then lock_owner is undefined. So we may as well always set
* it.
*/
ffi->lock_owner = td->td_proc->p_pid;
err = fdisp_wait_answ(&fdi);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_FLUSH);
err = 0;
}
fdisp_destroy(&fdi);
return err;
}
/* Close wrapper for fifos. */
static int
fuse_fifo_close(struct vop_close_args *ap)
{
return (fifo_specops.vop_close(ap));
}
/*
struct vnop_access_args {
struct vnode *a_vp;
#if VOP_ACCESS_TAKES_ACCMODE_T
accmode_t a_accmode;
#else
int a_mode;
#endif
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_access(struct vop_access_args *ap)
{
struct vnode *vp = ap->a_vp;
int accmode = ap->a_accmode;
struct ucred *cred = ap->a_cred;
struct fuse_data *data = fuse_get_mpdata(vnode_mount(vp));
int err;
if (fuse_isdeadfs(vp)) {
if (vnode_isvroot(vp)) {
return 0;
}
return ENXIO;
}
if (!(data->dataflags & FSESS_INITED)) {
if (vnode_isvroot(vp)) {
if (priv_check_cred(cred, PRIV_VFS_ADMIN) ||
(fuse_match_cred(data->daemoncred, cred) == 0)) {
return 0;
}
}
return EBADF;
}
if (vnode_islnk(vp)) {
return 0;
}
err = fuse_internal_access(vp, accmode, ap->a_td, ap->a_cred);
return err;
}
/*
* struct vop_advlock_args {
* struct vop_generic_args a_gen;
* struct vnode *a_vp;
* void *a_id;
* int a_op;
* struct flock *a_fl;
* int a_flags;
* }
*/
static int
fuse_vnop_advlock(struct vop_advlock_args *ap)
{
struct vnode *vp = ap->a_vp;
struct flock *fl = ap->a_fl;
struct thread *td = curthread;
struct ucred *cred = td->td_ucred;
pid_t pid = td->td_proc->p_pid;
struct fuse_filehandle *fufh;
struct fuse_dispatcher fdi;
struct fuse_lk_in *fli;
struct fuse_lk_out *flo;
enum fuse_opcode op;
int dataflags, err;
int flags = ap->a_flags;
dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (!(dataflags & FSESS_POSIX_LOCKS))
return vop_stdadvlock(ap);
/* FUSE doesn't properly support flock until protocol 7.17 */
if (flags & F_FLOCK)
return vop_stdadvlock(ap);
err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid);
if (err)
return err;
fdisp_init(&fdi, sizeof(*fli));
switch(ap->a_op) {
case F_GETLK:
op = FUSE_GETLK;
break;
case F_SETLK:
op = FUSE_SETLK;
break;
case F_SETLKW:
op = FUSE_SETLKW;
break;
default:
return EINVAL;
}
fdisp_make_vp(&fdi, op, vp, td, cred);
fli = fdi.indata;
fli->fh = fufh->fh_id;
fli->owner = fl->l_pid;
fli->lk.start = fl->l_start;
if (fl->l_len != 0)
fli->lk.end = fl->l_start + fl->l_len - 1;
else
fli->lk.end = INT64_MAX;
fli->lk.type = fl->l_type;
fli->lk.pid = fl->l_pid;
err = fdisp_wait_answ(&fdi);
fdisp_destroy(&fdi);
if (err == 0 && op == FUSE_GETLK) {
flo = fdi.answ;
fl->l_type = flo->lk.type;
fl->l_pid = flo->lk.pid;
if (flo->lk.type != F_UNLCK) {
fl->l_start = flo->lk.start;
if (flo->lk.end == INT64_MAX)
fl->l_len = 0;
else
fl->l_len = flo->lk.end - flo->lk.start + 1;
fl->l_start = flo->lk.start;
}
}
return err;
}
/* {
struct vnode *a_vp;
daddr_t a_bn;
struct bufobj **a_bop;
daddr_t *a_bnp;
int *a_runp;
int *a_runb;
} */
static int
fuse_vnop_bmap(struct vop_bmap_args *ap)
{
struct vnode *vp = ap->a_vp;
struct bufobj **bo = ap->a_bop;
struct thread *td = curthread;
struct mount *mp;
struct fuse_dispatcher fdi;
struct fuse_bmap_in *fbi;
struct fuse_bmap_out *fbo;
struct fuse_data *data;
uint64_t biosize;
off_t filesize;
daddr_t lbn = ap->a_bn;
daddr_t *pbn = ap->a_bnp;
int *runp = ap->a_runp;
int *runb = ap->a_runb;
int error = 0;
int maxrun;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
mp = vnode_mount(vp);
data = fuse_get_mpdata(mp);
biosize = fuse_iosize(vp);
maxrun = MIN(vp->v_mount->mnt_iosize_max / biosize - 1,
data->max_readahead_blocks);
if (bo != NULL)
*bo = &vp->v_bufobj;
/*
* The FUSE_BMAP operation does not include the runp and runb
* variables, so we must guess. Report nonzero contiguous runs so
* cluster_read will combine adjacent reads. It's worthwhile to reduce
* upcalls even if we don't know the true physical layout of the file.
*
* FUSE file systems may opt out of read clustering in two ways:
* * mounting with -onoclusterr
* * Setting max_readahead <= maxbcachebuf during FUSE_INIT
*/
if (runb != NULL)
*runb = MIN(lbn, maxrun);
if (runp != NULL) {
error = fuse_vnode_size(vp, &filesize, td->td_ucred, td);
if (error == 0)
*runp = MIN(MAX(0, filesize / (off_t)biosize - lbn - 1),
maxrun);
else
*runp = 0;
}
if (fsess_isimpl(mp, FUSE_BMAP)) {
fdisp_init(&fdi, sizeof(*fbi));
fdisp_make_vp(&fdi, FUSE_BMAP, vp, td, td->td_ucred);
fbi = fdi.indata;
fbi->block = lbn;
fbi->blocksize = biosize;
error = fdisp_wait_answ(&fdi);
if (error == ENOSYS) {
fdisp_destroy(&fdi);
fsess_set_notimpl(mp, FUSE_BMAP);
error = 0;
} else {
fbo = fdi.answ;
if (error == 0 && pbn != NULL)
*pbn = fbo->block;
fdisp_destroy(&fdi);
return error;
}
}
/* If the daemon doesn't support BMAP, make up a sensible default */
if (pbn != NULL)
*pbn = lbn * btodb(biosize);
return (error);
}
/*
struct vop_close_args {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_close(struct vop_close_args *ap)
{
struct vnode *vp = ap->a_vp;
struct ucred *cred = ap->a_cred;
int fflag = ap->a_fflag;
struct thread *td = ap->a_td;
pid_t pid = td->td_proc->p_pid;
int err = 0;
if (fuse_isdeadfs(vp))
return 0;
if (vnode_isdir(vp))
return 0;
if (fflag & IO_NDELAY)
return 0;
err = fuse_flush(vp, cred, pid, fflag);
/* TODO: close the file handle, if we're sure it's no longer used */
if ((VTOFUD(vp)->flag & FN_SIZECHANGE) != 0) {
fuse_vnode_savesize(vp, cred, td->td_proc->p_pid);
}
return err;
}
static void
fdisp_make_mknod_for_fallback(
struct fuse_dispatcher *fdip,
struct componentname *cnp,
struct vnode *dvp,
uint64_t parentnid,
struct thread *td,
struct ucred *cred,
mode_t mode,
enum fuse_opcode *op)
{
struct fuse_mknod_in *fmni;
fdisp_init(fdip, sizeof(*fmni) + cnp->cn_namelen + 1);
*op = FUSE_MKNOD;
fdisp_make(fdip, *op, vnode_mount(dvp), parentnid, td, cred);
fmni = fdip->indata;
fmni->mode = mode;
fmni->rdev = 0;
memcpy((char *)fdip->indata + sizeof(*fmni), cnp->cn_nameptr,
cnp->cn_namelen);
((char *)fdip->indata)[sizeof(*fmni) + cnp->cn_namelen] = '\0';
}
/*
struct vnop_create_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
};
*/
static int
fuse_vnop_create(struct vop_create_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
struct vattr *vap = ap->a_vap;
struct thread *td = cnp->cn_thread;
struct ucred *cred = cnp->cn_cred;
struct fuse_data *data;
struct fuse_create_in *fci;
struct fuse_entry_out *feo;
struct fuse_open_out *foo;
struct fuse_dispatcher fdi, fdi2;
struct fuse_dispatcher *fdip = &fdi;
struct fuse_dispatcher *fdip2 = NULL;
int err;
struct mount *mp = vnode_mount(dvp);
data = fuse_get_mpdata(mp);
uint64_t parentnid = VTOFUD(dvp)->nid;
mode_t mode = MAKEIMODE(vap->va_type, vap->va_mode);
enum fuse_opcode op;
int flags;
if (fuse_isdeadfs(dvp))
return ENXIO;
/* FUSE expects sockets to be created with FUSE_MKNOD */
if (vap->va_type == VSOCK)
return fuse_internal_mknod(dvp, vpp, cnp, vap);
/*
* VOP_CREATE doesn't tell us the open(2) flags, so we guess. Only a
* writable mode makes sense, and we might as well include readability
* too.
*/
flags = O_RDWR;
bzero(&fdi, sizeof(fdi));
if (vap->va_type != VREG)
return (EINVAL);
if (!fsess_isimpl(mp, FUSE_CREATE) || vap->va_type == VSOCK) {
/* Fallback to FUSE_MKNOD/FUSE_OPEN */
fdisp_make_mknod_for_fallback(fdip, cnp, dvp, parentnid, td,
cred, mode, &op);
} else {
/* Use FUSE_CREATE */
size_t insize;
op = FUSE_CREATE;
fdisp_init(fdip, sizeof(*fci) + cnp->cn_namelen + 1);
fdisp_make(fdip, op, vnode_mount(dvp), parentnid, td, cred);
fci = fdip->indata;
fci->mode = mode;
fci->flags = O_CREAT | flags;
if (fuse_libabi_geq(data, 7, 12)) {
insize = sizeof(*fci);
fci->umask = td->td_proc->p_fd->fd_cmask;
} else {
insize = sizeof(struct fuse_open_in);
}
memcpy((char *)fdip->indata + insize, cnp->cn_nameptr,
cnp->cn_namelen);
((char *)fdip->indata)[insize + cnp->cn_namelen] = '\0';
}
err = fdisp_wait_answ(fdip);
if (err) {
if (err == ENOSYS && op == FUSE_CREATE) {
fsess_set_notimpl(mp, FUSE_CREATE);
fdisp_destroy(fdip);
fdisp_make_mknod_for_fallback(fdip, cnp, dvp,
parentnid, td, cred, mode, &op);
err = fdisp_wait_answ(fdip);
}
if (err)
goto out;
}
feo = fdip->answ;
if ((err = fuse_internal_checkentry(feo, vap->va_type))) {
goto out;
}
if (op == FUSE_CREATE) {
foo = (struct fuse_open_out*)(feo + 1);
} else {
/* Issue a separate FUSE_OPEN */
struct fuse_open_in *foi;
fdip2 = &fdi2;
fdisp_init(fdip2, sizeof(*foi));
fdisp_make(fdip2, FUSE_OPEN, vnode_mount(dvp), feo->nodeid, td,
cred);
foi = fdip2->indata;
foi->flags = flags;
err = fdisp_wait_answ(fdip2);
if (err)
goto out;
foo = fdip2->answ;
}
err = fuse_vnode_get(mp, feo, feo->nodeid, dvp, vpp, cnp, vap->va_type);
if (err) {
struct fuse_release_in *fri;
uint64_t nodeid = feo->nodeid;
uint64_t fh_id = foo->fh;
fdisp_init(fdip, sizeof(*fri));
fdisp_make(fdip, FUSE_RELEASE, mp, nodeid, td, cred);
fri = fdip->indata;
fri->fh = fh_id;
fri->flags = flags;
fuse_insert_callback(fdip->tick, fuse_internal_forget_callback);
fuse_insert_message(fdip->tick, false);
goto out;
}
ASSERT_VOP_ELOCKED(*vpp, "fuse_vnop_create");
fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid,
feo->attr_valid_nsec, NULL);
fuse_filehandle_init(*vpp, FUFH_RDWR, NULL, td, cred, foo);
fuse_vnode_open(*vpp, foo->open_flags, td);
/*
* Purge the parent's attribute cache because the daemon should've
* updated its mtime and ctime
*/
fuse_vnode_clear_attr_cache(dvp);
cache_purge_negative(dvp);
out:
if (fdip2)
fdisp_destroy(fdip2);
fdisp_destroy(fdip);
return err;
}
/*
struct vnop_fdatasync_args {
struct vop_generic_args a_gen;
struct vnode * a_vp;
struct thread * a_td;
};
*/
static int
fuse_vnop_fdatasync(struct vop_fdatasync_args *ap)
{
struct vnode *vp = ap->a_vp;
struct thread *td = ap->a_td;
int waitfor = MNT_WAIT;
int err = 0;
if (fuse_isdeadfs(vp)) {
return 0;
}
if ((err = vop_stdfdatasync_buf(ap)))
return err;
return fuse_internal_fsync(vp, td, waitfor, true);
}
/*
struct vnop_fsync_args {
struct vop_generic_args a_gen;
struct vnode * a_vp;
int a_waitfor;
struct thread * a_td;
};
*/
static int
fuse_vnop_fsync(struct vop_fsync_args *ap)
{
struct vnode *vp = ap->a_vp;
struct thread *td = ap->a_td;
int waitfor = ap->a_waitfor;
int err = 0;
if (fuse_isdeadfs(vp)) {
return 0;
}
if ((err = vop_stdfsync(ap)))
return err;
return fuse_internal_fsync(vp, td, waitfor, false);
}
/*
struct vnop_getattr_args {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_getattr(struct vop_getattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct thread *td = curthread;
int err = 0;
int dataflags;
dataflags = fuse_get_mpdata(vnode_mount(vp))->dataflags;
/* Note that we are not bailing out on a dead file system just yet. */
if (!(dataflags & FSESS_INITED)) {
if (!vnode_isvroot(vp)) {
fdata_set_dead(fuse_get_mpdata(vnode_mount(vp)));
err = ENOTCONN;
return err;
} else {
goto fake;
}
}
err = fuse_internal_getattr(vp, vap, cred, td);
if (err == ENOTCONN && vnode_isvroot(vp)) {
/* see comment in fuse_vfsop_statfs() */
goto fake;
} else {
return err;
}
fake:
bzero(vap, sizeof(*vap));
vap->va_type = vnode_vtype(vp);
return 0;
}
/*
struct vnop_inactive_args {
struct vnode *a_vp;
struct thread *a_td;
};
*/
static int
fuse_vnop_inactive(struct vop_inactive_args *ap)
{
struct vnode *vp = ap->a_vp;
struct thread *td = ap->a_td;
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct fuse_filehandle *fufh, *fufh_tmp;
int need_flush = 1;
LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) {
if (need_flush && vp->v_type == VREG) {
if ((VTOFUD(vp)->flag & FN_SIZECHANGE) != 0) {
fuse_vnode_savesize(vp, NULL, 0);
}
if ((fvdat->flag & FN_REVOKED) != 0)
fuse_io_invalbuf(vp, td);
else
fuse_io_flushbuf(vp, MNT_WAIT, td);
need_flush = 0;
}
fuse_filehandle_close(vp, fufh, td, NULL);
}
if ((fvdat->flag & FN_REVOKED) != 0)
vrecycle(vp);
return 0;
}
/*
struct vnop_link_args {
struct vnode *a_tdvp;
struct vnode *a_vp;
struct componentname *a_cnp;
};
*/
static int
fuse_vnop_link(struct vop_link_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vnode *tdvp = ap->a_tdvp;
struct componentname *cnp = ap->a_cnp;
struct vattr *vap = VTOVA(vp);
struct fuse_dispatcher fdi;
struct fuse_entry_out *feo;
struct fuse_link_in fli;
int err;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (vnode_mount(tdvp) != vnode_mount(vp)) {
return EXDEV;
}
/*
* This is a seatbelt check to protect naive userspace filesystems from
* themselves and the limitations of the FUSE IPC protocol. If a
* filesystem does not allow attribute caching, assume it is capable of
* validating that nlink does not overflow.
*/
if (vap != NULL && vap->va_nlink >= FUSE_LINK_MAX)
return EMLINK;
fli.oldnodeid = VTOI(vp);
fdisp_init(&fdi, 0);
fuse_internal_newentry_makerequest(vnode_mount(tdvp), VTOI(tdvp), cnp,
FUSE_LINK, &fli, sizeof(fli), &fdi);
if ((err = fdisp_wait_answ(&fdi))) {
goto out;
}
feo = fdi.answ;
err = fuse_internal_checkentry(feo, vnode_vtype(vp));
if (!err) {
/*
* Purge the parent's attribute cache because the daemon
* should've updated its mtime and ctime
*/
fuse_vnode_clear_attr_cache(tdvp);
fuse_internal_cache_attrs(vp, &feo->attr, feo->attr_valid,
feo->attr_valid_nsec, NULL);
}
out:
fdisp_destroy(&fdi);
return err;
}
struct fuse_lookup_alloc_arg {
struct fuse_entry_out *feo;
struct componentname *cnp;
uint64_t nid;
enum vtype vtyp;
};
/* Callback for vn_get_ino */
static int
fuse_lookup_alloc(struct mount *mp, void *arg, int lkflags, struct vnode **vpp)
{
struct fuse_lookup_alloc_arg *flaa = arg;
return fuse_vnode_get(mp, flaa->feo, flaa->nid, NULL, vpp, flaa->cnp,
flaa->vtyp);
}
SDT_PROBE_DEFINE3(fusefs, , vnops, cache_lookup,
"int", "struct timespec*", "struct timespec*");
SDT_PROBE_DEFINE2(fusefs, , vnops, lookup_cache_incoherent,
"struct vnode*", "struct fuse_entry_out*");
/*
struct vnop_lookup_args {
struct vnodeop_desc *a_desc;
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
};
*/
int
fuse_vnop_lookup(struct vop_lookup_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
struct thread *td = cnp->cn_thread;
struct ucred *cred = cnp->cn_cred;
int nameiop = cnp->cn_nameiop;
int flags = cnp->cn_flags;
int wantparent = flags & (LOCKPARENT | WANTPARENT);
int islastcn = flags & ISLASTCN;
struct mount *mp = vnode_mount(dvp);
struct fuse_data *data = fuse_get_mpdata(mp);
int default_permissions = data->dataflags & FSESS_DEFAULT_PERMISSIONS;
int err = 0;
int lookup_err = 0;
struct vnode *vp = NULL;
struct fuse_dispatcher fdi;
bool did_lookup = false;
struct fuse_entry_out *feo = NULL;
enum vtype vtyp; /* vnode type of target */
off_t filesize; /* filesize of target */
uint64_t nid;
if (fuse_isdeadfs(dvp)) {
*vpp = NULL;
return ENXIO;
}
if (!vnode_isdir(dvp))
return ENOTDIR;
if (islastcn && vfs_isrdonly(mp) && (nameiop != LOOKUP))
return EROFS;
if ((cnp->cn_flags & NOEXECCHECK) != 0)
cnp->cn_flags &= ~NOEXECCHECK;
else if ((err = fuse_internal_access(dvp, VEXEC, td, cred)))
return err;
if (flags & ISDOTDOT) {
KASSERT(VTOFUD(dvp)->flag & FN_PARENT_NID,
("Looking up .. is TODO"));
nid = VTOFUD(dvp)->parent_nid;
if (nid == 0)
return ENOENT;
/* .. is obviously a directory */
vtyp = VDIR;
filesize = 0;
} else if (cnp->cn_namelen == 1 && *(cnp->cn_nameptr) == '.') {
nid = VTOI(dvp);
/* . is obviously a directory */
vtyp = VDIR;
filesize = 0;
} else {
struct timespec now, timeout;
err = cache_lookup(dvp, vpp, cnp, &timeout, NULL);
getnanouptime(&now);
SDT_PROBE3(fusefs, , vnops, cache_lookup, err, &timeout, &now);
switch (err) {
case -1: /* positive match */
if (timespeccmp(&timeout, &now, >)) {
counter_u64_add(fuse_lookup_cache_hits, 1);
} else {
/* Cache timeout */
counter_u64_add(fuse_lookup_cache_misses, 1);
bintime_clear(
&VTOFUD(*vpp)->entry_cache_timeout);
cache_purge(*vpp);
if (dvp != *vpp)
vput(*vpp);
else
vrele(*vpp);
*vpp = NULL;
break;
}
return 0;
case 0: /* no match in cache */
counter_u64_add(fuse_lookup_cache_misses, 1);
break;
case ENOENT: /* negative match */
getnanouptime(&now);
if (timespeccmp(&timeout, &now, <=)) {
/* Cache timeout */
cache_purge_negative(dvp);
break;
}
/* fall through */
default:
return err;
}
nid = VTOI(dvp);
fdisp_init(&fdi, cnp->cn_namelen + 1);
fdisp_make(&fdi, FUSE_LOOKUP, mp, nid, td, cred);
memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
((char *)fdi.indata)[cnp->cn_namelen] = '\0';
lookup_err = fdisp_wait_answ(&fdi);
did_lookup = true;
if (!lookup_err) {
/* lookup call succeeded */
feo = (struct fuse_entry_out *)fdi.answ;
nid = feo->nodeid;
if (nid == 0) {
/* zero nodeid means ENOENT and cache it */
struct timespec timeout;
fdi.answ_stat = ENOENT;
lookup_err = ENOENT;
if (cnp->cn_flags & MAKEENTRY) {
fuse_validity_2_timespec(feo, &timeout);
cache_enter_time(dvp, *vpp, cnp,
&timeout, NULL);
}
} else if (nid == FUSE_ROOT_ID) {
lookup_err = EINVAL;
}
vtyp = IFTOVT(feo->attr.mode);
filesize = feo->attr.size;
}
if (lookup_err && (!fdi.answ_stat || lookup_err != ENOENT)) {
fdisp_destroy(&fdi);
return lookup_err;
}
}
/* lookup_err, if non-zero, must be ENOENT at this point */
if (lookup_err) {
/* Entry not found */
if ((nameiop == CREATE || nameiop == RENAME) && islastcn) {
if (default_permissions)
err = fuse_internal_access(dvp, VWRITE, td,
cred);
else
err = 0;
if (!err) {
/*
* Set the SAVENAME flag to hold onto the
* pathname for use later in VOP_CREATE or
* VOP_RENAME.
*/
cnp->cn_flags |= SAVENAME;
err = EJUSTRETURN;
}
} else {
err = ENOENT;
}
} else {
/* Entry was found */
if (flags & ISDOTDOT) {
struct fuse_lookup_alloc_arg flaa;
flaa.nid = nid;
flaa.feo = feo;
flaa.cnp = cnp;
flaa.vtyp = vtyp;
err = vn_vget_ino_gen(dvp, fuse_lookup_alloc, &flaa, 0,
&vp);
*vpp = vp;
} else if (nid == VTOI(dvp)) {
vref(dvp);
*vpp = dvp;
} else {
struct fuse_vnode_data *fvdat;
struct vattr *vap;
err = fuse_vnode_get(vnode_mount(dvp), feo, nid, dvp,
&vp, cnp, vtyp);
if (err)
goto out;
*vpp = vp;
/*
* In the case where we are looking up a FUSE node
* represented by an existing cached vnode, and the
* true size reported by FUSE_LOOKUP doesn't match
* the vnode's cached size, then any cached writes
* beyond the file's current size are lost.
*
* We can get here:
* * following attribute cache expiration, or
* * due a bug in the daemon, or
*/
fvdat = VTOFUD(vp);
if (vnode_isreg(vp) &&
((filesize != fvdat->cached_attrs.va_size &&
fvdat->flag & FN_SIZECHANGE) ||
((vap = VTOVA(vp)) &&
filesize != vap->va_size)))
{
SDT_PROBE2(fusefs, , vnops, lookup_cache_incoherent, vp, feo);
fvdat->flag &= ~FN_SIZECHANGE;
/*
* The server changed the file's size even
* though we had it cached, or had dirty writes
* in the WB cache!
*/
printf("%s: cache incoherent on %s! "
"Buggy FUSE server detected. To prevent "
"data corruption, disable the data cache "
"by mounting with -o direct_io, or as "
"directed otherwise by your FUSE server's "
"documentation\n", __func__,
vnode_mount(vp)->mnt_stat.f_mntonname);
int iosize = fuse_iosize(vp);
v_inval_buf_range(vp, 0, INT64_MAX, iosize);
}
MPASS(feo != NULL);
fuse_internal_cache_attrs(*vpp, &feo->attr,
feo->attr_valid, feo->attr_valid_nsec, NULL);
fuse_validity_2_bintime(feo->entry_valid,
feo->entry_valid_nsec,
&fvdat->entry_cache_timeout);
if ((nameiop == DELETE || nameiop == RENAME) &&
islastcn && default_permissions)
{
struct vattr dvattr;
err = fuse_internal_access(dvp, VWRITE, td,
cred);
if (err != 0)
goto out;
/*
* if the parent's sticky bit is set, check
* whether we're allowed to remove the file.
* Need to figure out the vnode locking to make
* this work.
*/
fuse_internal_getattr(dvp, &dvattr, cred, td);
if ((dvattr.va_mode & S_ISTXT) &&
fuse_internal_access(dvp, VADMIN, td,
cred) &&
fuse_internal_access(*vpp, VADMIN, td,
cred)) {
err = EPERM;
goto out;
}
}
if (islastcn && (
(nameiop == DELETE) ||
(nameiop == RENAME && wantparent))) {
cnp->cn_flags |= SAVENAME;
}
}
}
out:
if (err) {
if (vp != NULL && dvp != vp)
vput(vp);
else if (vp != NULL)
vrele(vp);
*vpp = NULL;
}
if (did_lookup)
fdisp_destroy(&fdi);
return err;
}
/*
struct vnop_mkdir_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
};
*/
static int
fuse_vnop_mkdir(struct vop_mkdir_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
struct vattr *vap = ap->a_vap;
struct fuse_mkdir_in fmdi;
if (fuse_isdeadfs(dvp)) {
return ENXIO;
}
fmdi.mode = MAKEIMODE(vap->va_type, vap->va_mode);
fmdi.umask = curthread->td_proc->p_fd->fd_cmask;
return (fuse_internal_newentry(dvp, vpp, cnp, FUSE_MKDIR, &fmdi,
sizeof(fmdi), VDIR));
}
/*
struct vnop_mknod_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
};
*/
static int
fuse_vnop_mknod(struct vop_mknod_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
struct vattr *vap = ap->a_vap;
if (fuse_isdeadfs(dvp))
return ENXIO;
return fuse_internal_mknod(dvp, vpp, cnp, vap);
}
/*
struct vop_open_args {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
int a_fdidx; / struct file *a_fp;
};
*/
static int
fuse_vnop_open(struct vop_open_args *ap)
{
struct vnode *vp = ap->a_vp;
int a_mode = ap->a_mode;
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
pid_t pid = td->td_proc->p_pid;
struct fuse_vnode_data *fvdat;
if (fuse_isdeadfs(vp))
return ENXIO;
if (vp->v_type == VCHR || vp->v_type == VBLK || vp->v_type == VFIFO)
return (EOPNOTSUPP);
if ((a_mode & (FREAD | FWRITE | FEXEC)) == 0)
return EINVAL;
fvdat = VTOFUD(vp);
if (fuse_filehandle_validrw(vp, a_mode, cred, pid)) {
fuse_vnode_open(vp, 0, td);
return 0;
}
return fuse_filehandle_open(vp, a_mode, NULL, td, cred);
}
static int
fuse_vnop_pathconf(struct vop_pathconf_args *ap)
{
switch (ap->a_name) {
case _PC_FILESIZEBITS:
*ap->a_retval = 64;
return (0);
case _PC_NAME_MAX:
*ap->a_retval = NAME_MAX;
return (0);
case _PC_LINK_MAX:
*ap->a_retval = MIN(LONG_MAX, FUSE_LINK_MAX);
return (0);
case _PC_SYMLINK_MAX:
*ap->a_retval = MAXPATHLEN;
return (0);
case _PC_NO_TRUNC:
*ap->a_retval = 1;
return (0);
default:
return (vop_stdpathconf(ap));
}
}
/*
struct vnop_read_args {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
};
*/
static int
fuse_vnop_read(struct vop_read_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
int ioflag = ap->a_ioflag;
struct ucred *cred = ap->a_cred;
pid_t pid = curthread->td_proc->p_pid;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (VTOFUD(vp)->flag & FN_DIRECTIO) {
ioflag |= IO_DIRECT;
}
return fuse_io_dispatch(vp, uio, ioflag, cred, pid);
}
/*
struct vnop_readdir_args {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_eofflag;
int *a_ncookies;
u_long **a_cookies;
};
*/
static int
fuse_vnop_readdir(struct vop_readdir_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct ucred *cred = ap->a_cred;
struct fuse_filehandle *fufh = NULL;
struct fuse_iov cookediov;
int err = 0;
u_long *cookies;
off_t startoff;
ssize_t tresid;
int ncookies;
bool closefufh = false;
pid_t pid = curthread->td_proc->p_pid;
if (ap->a_eofflag)
*ap->a_eofflag = 0;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if ( /* XXXIP ((uio_iovcnt(uio) > 1)) || */
(uio_resid(uio) < sizeof(struct dirent))) {
return EINVAL;
}
tresid = uio->uio_resid;
startoff = uio->uio_offset;
err = fuse_filehandle_get_dir(vp, &fufh, cred, pid);
if (err == EBADF && vnode_mount(vp)->mnt_flag & MNT_EXPORTED) {
/*
* nfsd will do VOP_READDIR without first doing VOP_OPEN. We
* must implicitly open the directory here
*/
err = fuse_filehandle_open(vp, FREAD, &fufh, curthread, cred);
if (err == 0) {
/*
* When a directory is opened, it must be read from
* the beginning. Hopefully, the "startoff" still
* exists as an offset cookie for the directory.
* If not, it will read the entire directory without
* returning any entries and just return eof.
*/
uio->uio_offset = 0;
}
closefufh = true;
}
if (err)
return (err);
if (ap->a_ncookies != NULL) {
ncookies = uio->uio_resid /
(offsetof(struct dirent, d_name) + 4) + 1;
cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
*ap->a_ncookies = ncookies;
*ap->a_cookies = cookies;
} else {
ncookies = 0;
cookies = NULL;
}
#define DIRCOOKEDSIZE FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + MAXNAMLEN + 1)
fiov_init(&cookediov, DIRCOOKEDSIZE);
err = fuse_internal_readdir(vp, uio, startoff, fufh, &cookediov,
&ncookies, cookies);
fiov_teardown(&cookediov);
if (closefufh)
fuse_filehandle_close(vp, fufh, curthread, cred);
if (ap->a_ncookies != NULL) {
if (err == 0) {
*ap->a_ncookies -= ncookies;
} else {
free(*ap->a_cookies, M_TEMP);
*ap->a_ncookies = 0;
*ap->a_cookies = NULL;
}
}
if (err == 0 && tresid == uio->uio_resid)
*ap->a_eofflag = 1;
return err;
}
/*
struct vnop_readlink_args {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
};
*/
static int
fuse_vnop_readlink(struct vop_readlink_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct ucred *cred = ap->a_cred;
struct fuse_dispatcher fdi;
int err;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (!vnode_islnk(vp)) {
return EINVAL;
}
fdisp_init(&fdi, 0);
err = fdisp_simple_putget_vp(&fdi, FUSE_READLINK, vp, curthread, cred);
if (err) {
goto out;
}
if (((char *)fdi.answ)[0] == '/' &&
fuse_get_mpdata(vnode_mount(vp))->dataflags & FSESS_PUSH_SYMLINKS_IN) {
char *mpth = vnode_mount(vp)->mnt_stat.f_mntonname;
err = uiomove(mpth, strlen(mpth), uio);
}
if (!err) {
err = uiomove(fdi.answ, fdi.iosize, uio);
}
out:
fdisp_destroy(&fdi);
return err;
}
/*
struct vnop_reclaim_args {
struct vnode *a_vp;
struct thread *a_td;
};
*/
static int
fuse_vnop_reclaim(struct vop_reclaim_args *ap)
{
struct vnode *vp = ap->a_vp;
struct thread *td = ap->a_td;
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct fuse_filehandle *fufh, *fufh_tmp;
if (!fvdat) {
panic("FUSE: no vnode data during recycling");
}
LIST_FOREACH_SAFE(fufh, &fvdat->handles, next, fufh_tmp) {
printf("FUSE: vnode being reclaimed with open fufh "
"(type=%#x)", fufh->fufh_type);
fuse_filehandle_close(vp, fufh, td, NULL);
}
if (!fuse_isdeadfs(vp) && fvdat->nlookup > 0) {
fuse_internal_forget_send(vnode_mount(vp), td, NULL, VTOI(vp),
fvdat->nlookup);
}
cache_purge(vp);
vfs_hash_remove(vp);
fuse_vnode_destroy(vp);
return 0;
}
/*
struct vnop_remove_args {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
};
*/
static int
fuse_vnop_remove(struct vop_remove_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
struct componentname *cnp = ap->a_cnp;
int err;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (vnode_isdir(vp)) {
return EPERM;
}
err = fuse_internal_remove(dvp, vp, cnp, FUSE_UNLINK);
return err;
}
/*
struct vnop_rename_args {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
};
*/
static int
fuse_vnop_rename(struct vop_rename_args *ap)
{
struct vnode *fdvp = ap->a_fdvp;
struct vnode *fvp = ap->a_fvp;
struct componentname *fcnp = ap->a_fcnp;
struct vnode *tdvp = ap->a_tdvp;
struct vnode *tvp = ap->a_tvp;
struct componentname *tcnp = ap->a_tcnp;
struct fuse_data *data;
bool newparent = fdvp != tdvp;
bool isdir = fvp->v_type == VDIR;
int err = 0;
if (fuse_isdeadfs(fdvp)) {
return ENXIO;
}
if (fvp->v_mount != tdvp->v_mount ||
(tvp && fvp->v_mount != tvp->v_mount)) {
SDT_PROBE2(fusefs, , vnops, trace, 1, "cross-device rename");
err = EXDEV;
goto out;
}
cache_purge(fvp);
/*
* FUSE library is expected to check if target directory is not
* under the source directory in the file system tree.
* Linux performs this check at VFS level.
*/
/*
* If source is a directory, and it will get a new parent, user must
* have write permission to it, so ".." can be modified.
*/
data = fuse_get_mpdata(vnode_mount(tdvp));
if (data->dataflags & FSESS_DEFAULT_PERMISSIONS && isdir && newparent) {
err = fuse_internal_access(fvp, VWRITE,
tcnp->cn_thread, tcnp->cn_cred);
if (err)
goto out;
}
sx_xlock(&data->rename_lock);
err = fuse_internal_rename(fdvp, fcnp, tdvp, tcnp);
if (err == 0) {
if (tdvp != fdvp)
fuse_vnode_setparent(fvp, tdvp);
if (tvp != NULL)
fuse_vnode_setparent(tvp, NULL);
}
sx_unlock(&data->rename_lock);
if (tvp != NULL && tvp != fvp) {
cache_purge(tvp);
}
if (vnode_isdir(fvp)) {
if ((tvp != NULL) && vnode_isdir(tvp)) {
cache_purge(tdvp);
}
cache_purge(fdvp);
}
out:
if (tdvp == tvp) {
vrele(tdvp);
} else {
vput(tdvp);
}
if (tvp != NULL) {
vput(tvp);
}
vrele(fdvp);
vrele(fvp);
return err;
}
/*
struct vnop_rmdir_args {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} *ap;
*/
static int
fuse_vnop_rmdir(struct vop_rmdir_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode *vp = ap->a_vp;
int err;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (VTOFUD(vp) == VTOFUD(dvp)) {
return EINVAL;
}
err = fuse_internal_remove(dvp, vp, ap->a_cnp, FUSE_RMDIR);
return err;
}
/*
struct vnop_setattr_args {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_setattr(struct vop_setattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct thread *td = curthread;
struct mount *mp;
struct fuse_data *data;
struct vattr old_va;
int dataflags;
int err = 0, err2;
accmode_t accmode = 0;
bool checkperm;
bool drop_suid = false;
gid_t cr_gid;
mp = vnode_mount(vp);
data = fuse_get_mpdata(mp);
dataflags = data->dataflags;
checkperm = dataflags & FSESS_DEFAULT_PERMISSIONS;
if (cred->cr_ngroups > 0)
cr_gid = cred->cr_groups[0];
else
cr_gid = 0;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (vap->va_uid != (uid_t)VNOVAL) {
if (checkperm) {
/* Only root may change a file's owner */
err = priv_check_cred(cred, PRIV_VFS_CHOWN);
if (err) {
/* As a special case, allow the null chown */
err2 = fuse_internal_getattr(vp, &old_va, cred,
td);
if (err2)
return (err2);
if (vap->va_uid != old_va.va_uid)
return err;
else
accmode |= VADMIN;
drop_suid = true;
} else
accmode |= VADMIN;
} else
accmode |= VADMIN;
}
if (vap->va_gid != (gid_t)VNOVAL) {
if (checkperm && priv_check_cred(cred, PRIV_VFS_CHOWN))
drop_suid = true;
if (checkperm && !groupmember(vap->va_gid, cred))
{
/*
* Non-root users may only chgrp to one of their own
* groups
*/
err = priv_check_cred(cred, PRIV_VFS_CHOWN);
if (err) {
/* As a special case, allow the null chgrp */
err2 = fuse_internal_getattr(vp, &old_va, cred,
td);
if (err2)
return (err2);
if (vap->va_gid != old_va.va_gid)
return err;
accmode |= VADMIN;
} else
accmode |= VADMIN;
} else
accmode |= VADMIN;
}
if (vap->va_size != VNOVAL) {
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VLNK:
case VREG:
if (vfs_isrdonly(mp))
return (EROFS);
break;
default:
/*
* According to POSIX, the result is unspecified
* for file types other than regular files,
* directories and shared memory objects. We
* don't support shared memory objects in the file
* system, and have dubious support for truncating
* symlinks. Just ignore the request in other cases.
*/
return (0);
}
/* Don't set accmode. Permission to trunc is checked upstack */
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (vap->va_vaflags & VA_UTIMES_NULL)
accmode |= VWRITE;
else
accmode |= VADMIN;
}
if (drop_suid) {
if (vap->va_mode != (mode_t)VNOVAL)
vap->va_mode &= ~(S_ISUID | S_ISGID);
else {
err = fuse_internal_getattr(vp, &old_va, cred, td);
if (err)
return (err);
vap->va_mode = old_va.va_mode & ~(S_ISUID | S_ISGID);
}
}
if (vap->va_mode != (mode_t)VNOVAL) {
/* Only root may set the sticky bit on non-directories */
if (checkperm && vp->v_type != VDIR && (vap->va_mode & S_ISTXT)
&& priv_check_cred(cred, PRIV_VFS_STICKYFILE))
return EFTYPE;
if (checkperm && (vap->va_mode & S_ISGID)) {
err = fuse_internal_getattr(vp, &old_va, cred, td);
if (err)
return (err);
if (!groupmember(old_va.va_gid, cred)) {
err = priv_check_cred(cred, PRIV_VFS_SETGID);
if (err)
return (err);
}
}
accmode |= VADMIN;
}
if (vfs_isrdonly(mp))
return EROFS;
if (checkperm) {
err = fuse_internal_access(vp, accmode, td, cred);
} else {
err = 0;
}
if (err)
return err;
else
return fuse_internal_setattr(vp, vap, td, cred);
}
/*
struct vnop_strategy_args {
struct vnode *a_vp;
struct buf *a_bp;
};
*/
static int
fuse_vnop_strategy(struct vop_strategy_args *ap)
{
struct vnode *vp = ap->a_vp;
struct buf *bp = ap->a_bp;
if (!vp || fuse_isdeadfs(vp)) {
bp->b_ioflags |= BIO_ERROR;
bp->b_error = ENXIO;
bufdone(bp);
return 0;
}
/*
* VOP_STRATEGY always returns zero and signals error via bp->b_ioflags.
* fuse_io_strategy sets bp's error fields
*/
(void)fuse_io_strategy(vp, bp);
return 0;
}
/*
struct vnop_symlink_args {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
};
*/
static int
fuse_vnop_symlink(struct vop_symlink_args *ap)
{
struct vnode *dvp = ap->a_dvp;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
const char *target = ap->a_target;
struct fuse_dispatcher fdi;
int err;
size_t len;
if (fuse_isdeadfs(dvp)) {
return ENXIO;
}
/*
* Unlike the other creator type calls, here we have to create a message
* where the name of the new entry comes first, and the data describing
* the entry comes second.
* Hence we can't rely on our handy fuse_internal_newentry() routine,
* but put together the message manually and just call the core part.
*/
len = strlen(target) + 1;
fdisp_init(&fdi, len + cnp->cn_namelen + 1);
fdisp_make_vp(&fdi, FUSE_SYMLINK, dvp, curthread, NULL);
memcpy(fdi.indata, cnp->cn_nameptr, cnp->cn_namelen);
((char *)fdi.indata)[cnp->cn_namelen] = '\0';
memcpy((char *)fdi.indata + cnp->cn_namelen + 1, target, len);
err = fuse_internal_newentry_core(dvp, vpp, cnp, VLNK, &fdi);
fdisp_destroy(&fdi);
return err;
}
/*
struct vnop_write_args {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
};
*/
static int
fuse_vnop_write(struct vop_write_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
int ioflag = ap->a_ioflag;
struct ucred *cred = ap->a_cred;
pid_t pid = curthread->td_proc->p_pid;
if (fuse_isdeadfs(vp)) {
return ENXIO;
}
if (VTOFUD(vp)->flag & FN_DIRECTIO) {
ioflag |= IO_DIRECT;
}
return fuse_io_dispatch(vp, uio, ioflag, cred, pid);
}
static daddr_t
fuse_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
{
const int biosize = fuse_iosize(vp);
return (off / biosize);
}
static int
fuse_gbp_getblksz(struct vnode *vp, daddr_t lbn)
{
off_t filesize;
int blksz, err;
const int biosize = fuse_iosize(vp);
err = fuse_vnode_size(vp, &filesize, NULL, NULL);
KASSERT(err == 0, ("vfs_bio_getpages can't handle errors here"));
if (err)
return biosize;
if ((off_t)lbn * biosize >= filesize) {
blksz = 0;
} else if ((off_t)(lbn + 1) * biosize > filesize) {
blksz = filesize - (off_t)lbn *biosize;
} else {
blksz = biosize;
}
return (blksz);
}
/*
struct vnop_getpages_args {
struct vnode *a_vp;
vm_page_t *a_m;
int a_count;
int a_reqpage;
};
*/
static int
fuse_vnop_getpages(struct vop_getpages_args *ap)
{
struct vnode *vp = ap->a_vp;
if (!fsess_opt_mmap(vnode_mount(vp))) {
SDT_PROBE2(fusefs, , vnops, trace, 1,
"called on non-cacheable vnode??\n");
return (VM_PAGER_ERROR);
}
return (vfs_bio_getpages(vp, ap->a_m, ap->a_count, ap->a_rbehind,
ap->a_rahead, fuse_gbp_getblkno, fuse_gbp_getblksz));
}
static const char extattr_namespace_separator = '.';
/*
struct vop_getextattr_args {
struct vop_generic_args a_gen;
struct vnode *a_vp;
int a_attrnamespace;
const char *a_name;
struct uio *a_uio;
size_t *a_size;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_getextattr(struct vop_getextattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct fuse_dispatcher fdi;
struct fuse_getxattr_in *get_xattr_in;
struct fuse_getxattr_out *get_xattr_out;
struct mount *mp = vnode_mount(vp);
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
char *prefix;
char *attr_str;
size_t len;
int err;
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_GETXATTR))
return EOPNOTSUPP;
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
if (err)
return err;
/* Default to looking for user attributes. */
if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
else
prefix = EXTATTR_NAMESPACE_USER_STRING;
len = strlen(prefix) + sizeof(extattr_namespace_separator) +
strlen(ap->a_name) + 1;
fdisp_init(&fdi, len + sizeof(*get_xattr_in));
fdisp_make_vp(&fdi, FUSE_GETXATTR, vp, td, cred);
get_xattr_in = fdi.indata;
/*
* Check to see whether we're querying the available size or
* issuing the actual request. If we pass in 0, we get back struct
* fuse_getxattr_out. If we pass in a non-zero size, we get back
* that much data, without the struct fuse_getxattr_out header.
*/
if (uio == NULL)
get_xattr_in->size = 0;
else
get_xattr_in->size = uio->uio_resid;
attr_str = (char *)fdi.indata + sizeof(*get_xattr_in);
snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
ap->a_name);
err = fdisp_wait_answ(&fdi);
if (err != 0) {
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_GETXATTR);
err = EOPNOTSUPP;
}
goto out;
}
get_xattr_out = fdi.answ;
if (ap->a_size != NULL)
*ap->a_size = get_xattr_out->size;
if (uio != NULL)
err = uiomove(fdi.answ, fdi.iosize, uio);
out:
fdisp_destroy(&fdi);
return (err);
}
/*
struct vop_setextattr_args {
struct vop_generic_args a_gen;
struct vnode *a_vp;
int a_attrnamespace;
const char *a_name;
struct uio *a_uio;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_setextattr(struct vop_setextattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct fuse_dispatcher fdi;
struct fuse_setxattr_in *set_xattr_in;
struct mount *mp = vnode_mount(vp);
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
char *prefix;
size_t len;
char *attr_str;
int err;
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_SETXATTR))
return EOPNOTSUPP;
if (vfs_isrdonly(mp))
return EROFS;
/* Deleting xattrs must use VOP_DELETEEXTATTR instead */
if (ap->a_uio == NULL) {
/*
* If we got here as fallback from VOP_DELETEEXTATTR, then
* return EOPNOTSUPP.
*/
if (!fsess_isimpl(mp, FUSE_REMOVEXATTR))
return (EOPNOTSUPP);
else
return (EINVAL);
}
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td,
VWRITE);
if (err)
return err;
/* Default to looking for user attributes. */
if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
else
prefix = EXTATTR_NAMESPACE_USER_STRING;
len = strlen(prefix) + sizeof(extattr_namespace_separator) +
strlen(ap->a_name) + 1;
fdisp_init(&fdi, len + sizeof(*set_xattr_in) + uio->uio_resid);
fdisp_make_vp(&fdi, FUSE_SETXATTR, vp, td, cred);
set_xattr_in = fdi.indata;
set_xattr_in->size = uio->uio_resid;
attr_str = (char *)fdi.indata + sizeof(*set_xattr_in);
snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
ap->a_name);
err = uiomove((char *)fdi.indata + sizeof(*set_xattr_in) + len,
uio->uio_resid, uio);
if (err != 0) {
goto out;
}
err = fdisp_wait_answ(&fdi);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_SETXATTR);
err = EOPNOTSUPP;
}
if (err == ERESTART) {
/* Can't restart after calling uiomove */
err = EINTR;
}
out:
fdisp_destroy(&fdi);
return (err);
}
/*
* The Linux / FUSE extended attribute list is simply a collection of
* NUL-terminated strings. The FreeBSD extended attribute list is a single
* byte length followed by a non-NUL terminated string. So, this allows
* conversion of the Linux / FUSE format to the FreeBSD format in place.
* Linux attribute names are reported with the namespace as a prefix (e.g.
* "user.attribute_name"), but in FreeBSD they are reported without the
* namespace prefix (e.g. "attribute_name"). So, we're going from:
*
* user.attr_name1\0user.attr_name2\0
*
* to:
*
* <num>attr_name1<num>attr_name2
*
* Where "<num>" is a single byte number of characters in the attribute name.
*
* Args:
* prefix - exattr namespace prefix string
* list, list_len - input list with namespace prefixes
* bsd_list, bsd_list_len - output list compatible with bsd vfs
*/
static int
fuse_xattrlist_convert(char *prefix, const char *list, int list_len,
char *bsd_list, int *bsd_list_len)
{
int len, pos, dist_to_next, prefix_len;
pos = 0;
*bsd_list_len = 0;
prefix_len = strlen(prefix);
while (pos < list_len && list[pos] != '\0') {
dist_to_next = strlen(&list[pos]) + 1;
if (bcmp(&list[pos], prefix, prefix_len) == 0 &&
list[pos + prefix_len] == extattr_namespace_separator) {
len = dist_to_next -
(prefix_len + sizeof(extattr_namespace_separator)) - 1;
if (len >= EXTATTR_MAXNAMELEN)
return (ENAMETOOLONG);
bsd_list[*bsd_list_len] = len;
memcpy(&bsd_list[*bsd_list_len + 1],
&list[pos + prefix_len +
sizeof(extattr_namespace_separator)], len);
*bsd_list_len += len + 1;
}
pos += dist_to_next;
}
return (0);
}
/*
* List extended attributes
*
* The FUSE_LISTXATTR operation is based on Linux's listxattr(2) syscall, which
* has a number of differences compared to its FreeBSD equivalent,
* extattr_list_file:
*
* - FUSE_LISTXATTR returns all extended attributes across all namespaces,
* whereas listxattr(2) only returns attributes for a single namespace
* - FUSE_LISTXATTR prepends each attribute name with "namespace."
* - If the provided buffer is not large enough to hold the result,
* FUSE_LISTXATTR should return ERANGE, whereas listxattr is expected to
* return as many results as will fit.
*/
/*
struct vop_listextattr_args {
struct vop_generic_args a_gen;
struct vnode *a_vp;
int a_attrnamespace;
struct uio *a_uio;
size_t *a_size;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_listextattr(struct vop_listextattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct uio *uio = ap->a_uio;
struct fuse_dispatcher fdi;
struct fuse_listxattr_in *list_xattr_in;
struct fuse_listxattr_out *list_xattr_out;
struct mount *mp = vnode_mount(vp);
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
char *prefix;
char *bsd_list = NULL;
char *linux_list;
int bsd_list_len;
int linux_list_len;
int err;
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_LISTXATTR))
return EOPNOTSUPP;
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td, VREAD);
if (err)
return err;
/*
* Add space for a NUL and the period separator if enabled.
* Default to looking for user attributes.
*/
if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
else
prefix = EXTATTR_NAMESPACE_USER_STRING;
fdisp_init(&fdi, sizeof(*list_xattr_in));
fdisp_make_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);
/*
* Retrieve Linux / FUSE compatible list size.
*/
list_xattr_in = fdi.indata;
list_xattr_in->size = 0;
err = fdisp_wait_answ(&fdi);
if (err != 0) {
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_LISTXATTR);
err = EOPNOTSUPP;
}
goto out;
}
list_xattr_out = fdi.answ;
linux_list_len = list_xattr_out->size;
if (linux_list_len == 0) {
if (ap->a_size != NULL)
*ap->a_size = linux_list_len;
goto out;
}
/*
* Retrieve Linux / FUSE compatible list values.
*/
fdisp_refresh_vp(&fdi, FUSE_LISTXATTR, vp, td, cred);
list_xattr_in = fdi.indata;
list_xattr_in->size = linux_list_len;
err = fdisp_wait_answ(&fdi);
if (err == ERANGE) {
/*
* Race detected. The attribute list must've grown since the
* first FUSE_LISTXATTR call. Start over. Go all the way back
* to userland so we can process signals, if necessary, before
* restarting.
*/
err = ERESTART;
goto out;
} else if (err != 0)
goto out;
linux_list = fdi.answ;
/* FUSE doesn't allow the server to return more data than requested */
if (fdi.iosize > linux_list_len) {
printf("WARNING: FUSE protocol violation. Server returned "
"more extended attribute data than requested; "
"should've returned ERANGE instead");
} else {
/* But returning less data is fine */
linux_list_len = fdi.iosize;
}
/*
* Retrieve the BSD compatible list values.
* The Linux / FUSE attribute list format isn't the same
* as FreeBSD's format. So we need to transform it into
* FreeBSD's format before giving it to the user.
*/
bsd_list = malloc(linux_list_len, M_TEMP, M_WAITOK);
err = fuse_xattrlist_convert(prefix, linux_list, linux_list_len,
bsd_list, &bsd_list_len);
if (err != 0)
goto out;
if (ap->a_size != NULL)
*ap->a_size = bsd_list_len;
if (uio != NULL)
err = uiomove(bsd_list, bsd_list_len, uio);
out:
free(bsd_list, M_TEMP);
fdisp_destroy(&fdi);
return (err);
}
/*
struct vop_deleteextattr_args {
struct vop_generic_args a_gen;
struct vnode *a_vp;
int a_attrnamespace;
const char *a_name;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_deleteextattr(struct vop_deleteextattr_args *ap)
{
struct vnode *vp = ap->a_vp;
struct fuse_dispatcher fdi;
struct mount *mp = vnode_mount(vp);
struct thread *td = ap->a_td;
struct ucred *cred = ap->a_cred;
char *prefix;
size_t len;
char *attr_str;
int err;
if (fuse_isdeadfs(vp))
return (ENXIO);
if (!fsess_isimpl(mp, FUSE_REMOVEXATTR))
return EOPNOTSUPP;
if (vfs_isrdonly(mp))
return EROFS;
err = fuse_extattr_check_cred(vp, ap->a_attrnamespace, cred, td,
VWRITE);
if (err)
return err;
/* Default to looking for user attributes. */
if (ap->a_attrnamespace == EXTATTR_NAMESPACE_SYSTEM)
prefix = EXTATTR_NAMESPACE_SYSTEM_STRING;
else
prefix = EXTATTR_NAMESPACE_USER_STRING;
len = strlen(prefix) + sizeof(extattr_namespace_separator) +
strlen(ap->a_name) + 1;
fdisp_init(&fdi, len);
fdisp_make_vp(&fdi, FUSE_REMOVEXATTR, vp, td, cred);
attr_str = fdi.indata;
snprintf(attr_str, len, "%s%c%s", prefix, extattr_namespace_separator,
ap->a_name);
err = fdisp_wait_answ(&fdi);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_REMOVEXATTR);
err = EOPNOTSUPP;
}
fdisp_destroy(&fdi);
return (err);
}
/*
struct vnop_print_args {
struct vnode *a_vp;
};
*/
static int
fuse_vnop_print(struct vop_print_args *ap)
{
struct fuse_vnode_data *fvdat = VTOFUD(ap->a_vp);
printf("nodeid: %ju, parent nodeid: %ju, nlookup: %ju, flag: %#x\n",
(uintmax_t)VTOILLU(ap->a_vp), (uintmax_t)fvdat->parent_nid,
(uintmax_t)fvdat->nlookup,
fvdat->flag);
return 0;
}
/*
* Get an NFS filehandle for a FUSE file.
*
* This will only work for FUSE file systems that guarantee the uniqueness of
* nodeid:generation, which most don't.
*/
/*
vop_vptofh {
IN struct vnode *a_vp;
IN struct fid *a_fhp;
};
*/
static int
fuse_vnop_vptofh(struct vop_vptofh_args *ap)
{
struct vnode *vp = ap->a_vp;
struct fuse_vnode_data *fvdat = VTOFUD(vp);
struct fuse_fid *fhp = (struct fuse_fid *)(ap->a_fhp);
_Static_assert(sizeof(struct fuse_fid) <= sizeof(struct fid),
"FUSE fid type is too big");
struct mount *mp = vnode_mount(vp);
struct fuse_data *data = fuse_get_mpdata(mp);
struct vattr va;
int err;
if (!(data->dataflags & FSESS_EXPORT_SUPPORT))
return EOPNOTSUPP;
err = fuse_internal_getattr(vp, &va, curthread->td_ucred, curthread);
if (err)
return err;
/*ip = VTOI(ap->a_vp);*/
/*ufhp = (struct ufid *)ap->a_fhp;*/
fhp->len = sizeof(struct fuse_fid);
fhp->nid = fvdat->nid;
if (fvdat->generation <= UINT32_MAX)
fhp->gen = fvdat->generation;
else
return EOVERFLOW;
return (0);
}
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