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freebsd-src/sys/fs/fuse/fuse_vnops.c
Alan Somers 17a82e6af8 Fix vnode locking bug in fuse_vnop_copy_file_range 
MFC-With:	92bbfe1f0d
Reviewed by:	cem
Differential Revision:	https://reviews.freebsd.org/D27938
2021-01-03 11:16:20 -07:00

2750 lines
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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/filio.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_copy_file_range_t fuse_vnop_copy_file_range;
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_ioctl_t fuse_vnop_ioctl;
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_copy_file_range = fuse_vnop_copy_file_range,
.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,
.vop_ioctl = fuse_vnop_ioctl,
.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_not_impl(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));
}
/* Send FUSE_LSEEK for this node */
static int
fuse_vnop_do_lseek(struct vnode *vp, struct thread *td, struct ucred *cred,
pid_t pid, off_t *offp, int whence)
{
struct fuse_dispatcher fdi;
struct fuse_filehandle *fufh;
struct fuse_lseek_in *flsi;
struct fuse_lseek_out *flso;
struct mount *mp = vnode_mount(vp);
int err;
ASSERT_VOP_LOCKED(vp, __func__);
err = fuse_filehandle_getrw(vp, FREAD, &fufh, cred, pid);
if (err)
return (err);
fdisp_init(&fdi, sizeof(*flsi));
fdisp_make_vp(&fdi, FUSE_LSEEK, vp, td, cred);
flsi = fdi.indata;
flsi->fh = fufh->fh_id;
flsi->offset = *offp;
flsi->whence = whence;
err = fdisp_wait_answ(&fdi);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_LSEEK);
} else if (err == 0) {
fsess_set_impl(mp, FUSE_LSEEK);
flso = fdi.answ;
*offp = flso->offset;
}
fdisp_destroy(&fdi);
return (err);
}
/*
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;
}
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;
}
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);
vn_lock(vp, LK_SHARED | LK_RETRY);
err = fuse_filehandle_get_anyflags(vp, &fufh, cred, pid);
if (err)
goto out;
fdisp_init(&fdi, sizeof(*fli));
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;
}
}
out:
VOP_UNLOCK(vp);
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_maybe_impl(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;
}
/*
struct vop_copy_file_range_args {
struct vop_generic_args a_gen;
struct vnode *a_invp;
off_t *a_inoffp;
struct vnode *a_outvp;
off_t *a_outoffp;
size_t *a_lenp;
unsigned int a_flags;
struct ucred *a_incred;
struct ucred *a_outcred;
struct thread *a_fsizetd;
}
*/
static int
fuse_vnop_copy_file_range(struct vop_copy_file_range_args *ap)
{
struct vnode *invp = ap->a_invp;
struct vnode *outvp = ap->a_outvp;
struct mount *mp = vnode_mount(invp);
struct fuse_dispatcher fdi;
struct fuse_filehandle *infufh, *outfufh;
struct fuse_copy_file_range_in *fcfri;
struct ucred *incred = ap->a_incred;
struct ucred *outcred = ap->a_outcred;
struct fuse_write_out *fwo;
struct thread *td;
struct uio io;
pid_t pid;
int err;
if (mp != vnode_mount(outvp))
goto fallback;
if (incred->cr_uid != outcred->cr_uid)
goto fallback;
if (incred->cr_groups[0] != outcred->cr_groups[0])
goto fallback;
if (fsess_not_impl(mp, FUSE_COPY_FILE_RANGE))
goto fallback;
if (ap->a_fsizetd == NULL)
td = curthread;
else
td = ap->a_fsizetd;
pid = td->td_proc->p_pid;
/* Lock both vnodes, avoiding risk of deadlock. */
do {
err = vn_lock(outvp, LK_EXCLUSIVE);
if (invp == outvp)
break;
if (err == 0) {
err = vn_lock(invp, LK_SHARED | LK_NOWAIT);
if (err == 0)
break;
VOP_UNLOCK(outvp);
err = vn_lock(invp, LK_SHARED);
if (err == 0)
VOP_UNLOCK(invp);
}
} while (err == 0);
if (err != 0)
return (err);
err = fuse_filehandle_getrw(invp, FREAD, &infufh, incred, pid);
if (err)
goto unlock;
err = fuse_filehandle_getrw(outvp, FWRITE, &outfufh, outcred, pid);
if (err)
goto unlock;
if (ap->a_fsizetd) {
io.uio_offset = *ap->a_outoffp;
io.uio_resid = *ap->a_lenp;
err = vn_rlimit_fsize(outvp, &io, ap->a_fsizetd);
if (err)
goto unlock;
}
fdisp_init(&fdi, sizeof(*fcfri));
fdisp_make_vp(&fdi, FUSE_COPY_FILE_RANGE, invp, td, incred);
fcfri = fdi.indata;
fcfri->fh_in = infufh->fh_id;
fcfri->off_in = *ap->a_inoffp;
fcfri->nodeid_out = VTOI(outvp);
fcfri->fh_out = outfufh->fh_id;
fcfri->off_out = *ap->a_outoffp;
fcfri->len = *ap->a_lenp;
fcfri->flags = 0;
err = fdisp_wait_answ(&fdi);
if (err == 0) {
fwo = fdi.answ;
*ap->a_lenp = fwo->size;
*ap->a_inoffp += fwo->size;
*ap->a_outoffp += fwo->size;
fuse_internal_clear_suid_on_write(outvp, outcred, td);
}
fdisp_destroy(&fdi);
unlock:
if (invp != outvp)
VOP_UNLOCK(invp);
VOP_UNLOCK(outvp);
if (err == ENOSYS) {
fsess_set_notimpl(mp, FUSE_COPY_FILE_RANGE);
fallback:
err = vn_generic_copy_file_range(ap->a_invp, ap->a_inoffp,
ap->a_outvp, ap->a_outoffp, ap->a_lenp, ap->a_flags,
ap->a_incred, ap->a_outcred, ap->a_fsizetd);
}
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_not_impl(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_pd->pd_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;
};
*/
static int
fuse_vnop_inactive(struct vop_inactive_args *ap)
{
struct vnode *vp = ap->a_vp;
struct thread *td = curthread;
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_ioctl_args {
struct vnode *a_vp;
u_long a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct thread *a_td;
};
*/
static int
fuse_vnop_ioctl(struct vop_ioctl_args *ap)
{
struct vnode *vp = ap->a_vp;
struct mount *mp = vnode_mount(vp);
struct ucred *cred = ap->a_cred;
off_t *offp;
pid_t pid = ap->a_td->td_proc->p_pid;
int err;
switch (ap->a_command) {
case FIOSEEKDATA:
case FIOSEEKHOLE:
/* Call FUSE_LSEEK, if we can, or fall back to vop_stdioctl */
if (fsess_maybe_impl(mp, FUSE_LSEEK)) {
int whence;
offp = ap->a_data;
if (ap->a_command == FIOSEEKDATA)
whence = SEEK_DATA;
else
whence = SEEK_HOLE;
vn_lock(vp, LK_SHARED | LK_RETRY);
err = fuse_vnop_do_lseek(vp, ap->a_td, cred, pid, offp,
whence);
VOP_UNLOCK(vp);
}
if (fsess_not_impl(mp, FUSE_LSEEK))
err = vop_stdioctl(ap);
break;
default:
/* TODO: implement FUSE_IOCTL */
err = ENOTTY;
break;
}
return (err);
}
/*
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;
int ncpticks; /* here to accomodate for API contract */
err = cache_lookup(dvp, vpp, cnp, &timeout, &ncpticks);
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_pd->pd_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)
{
struct vnode *vp = ap->a_vp;
struct mount *mp;
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);
case _PC_MIN_HOLE_SIZE:
/*
* The FUSE protocol provides no mechanism for a server to
* report _PC_MIN_HOLE_SIZE. It's a protocol bug. Instead,
* return EINVAL if the server does not support FUSE_LSEEK, or
* 1 if it does.
*/
mp = vnode_mount(vp);
if (!fsess_is_impl(mp, FUSE_LSEEK) &&
!fsess_not_impl(mp, FUSE_LSEEK)) {
off_t offset = 0;
/* Issue a FUSE_LSEEK to find out if it's implemented */
fuse_vnop_do_lseek(vp, curthread, curthread->td_ucred,
curthread->td_proc->p_pid, &offset, SEEK_DATA);
}
if (fsess_is_impl(mp, FUSE_LSEEK)) {
*ap->a_retval = 1;
return (0);
} else {
/*
* Probably FUSE_LSEEK is not implemented. It might
* be, if the FUSE_LSEEK above returned an error like
* EACCES, but in that case we can't tell, so it's
* safest to report EINVAL anyway.
*/
return (EINVAL);
}
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;
};
*/
static int
fuse_vnop_reclaim(struct vop_reclaim_args *ap)
{
struct vnode *vp = ap->a_vp;
struct thread *td = curthread;
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_not_impl(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_not_impl(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_not_impl(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_not_impl(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_not_impl(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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