freebsd-nq/sys/fs/fuse/fuse_ipc.c

905 lines
22 KiB
C
Raw Normal View History

/*
* Copyright (c) 2007-2009 Google Inc. and Amit Singh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Copyright (C) 2005 Csaba Henk.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/lock.h>
#include <sys/sx.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/signalvar.h>
#include <sys/syscallsubr.h>
#include <sys/sysctl.h>
#include <vm/uma.h>
#include "fuse.h"
#include "fuse_node.h"
#include "fuse_ipc.h"
#include "fuse_internal.h"
#define FUSE_DEBUG_MODULE IPC
#include "fuse_debug.h"
static struct fuse_ticket *fticket_alloc(struct fuse_data *data);
static void fticket_refresh(struct fuse_ticket *ftick);
static void fticket_destroy(struct fuse_ticket *ftick);
static int fticket_wait_answer(struct fuse_ticket *ftick);
static __inline__ int
fticket_aw_pull_uio(struct fuse_ticket *ftick,
struct uio *uio);
static int fuse_body_audit(struct fuse_ticket *ftick, size_t blen);
static __inline__ void
fuse_setup_ihead(struct fuse_in_header *ihead,
struct fuse_ticket *ftick,
uint64_t nid,
enum fuse_opcode op,
size_t blen,
pid_t pid,
struct ucred *cred);
static fuse_handler_t fuse_standard_handler;
SYSCTL_NODE(_vfs, OID_AUTO, fuse, CTLFLAG_RW, 0, "FUSE tunables");
SYSCTL_STRING(_vfs_fuse, OID_AUTO, version, CTLFLAG_RD,
FUSE_FREEBSD_VERSION, 0, "fuse-freebsd version");
static int fuse_ticket_count = 0;
SYSCTL_INT(_vfs_fuse, OID_AUTO, ticket_count, CTLFLAG_RW,
&fuse_ticket_count, 0, "number of allocated tickets");
static long fuse_iov_permanent_bufsize = 1 << 19;
SYSCTL_LONG(_vfs_fuse, OID_AUTO, iov_permanent_bufsize, CTLFLAG_RW,
&fuse_iov_permanent_bufsize, 0,
"limit for permanently stored buffer size for fuse_iovs");
static int fuse_iov_credit = 16;
SYSCTL_INT(_vfs_fuse, OID_AUTO, iov_credit, CTLFLAG_RW,
&fuse_iov_credit, 0,
"how many times is an oversized fuse_iov tolerated");
MALLOC_DEFINE(M_FUSEMSG, "fuse_msgbuf", "fuse message buffer");
static uma_zone_t ticket_zone;
static void
fuse_block_sigs(sigset_t *oldset)
{
sigset_t newset;
SIGFILLSET(newset);
SIGDELSET(newset, SIGKILL);
if (kern_sigprocmask(curthread, SIG_BLOCK, &newset, oldset, 0))
panic("%s: Invalid operation for kern_sigprocmask()",
__func__);
}
static void
fuse_restore_sigs(sigset_t *oldset)
{
if (kern_sigprocmask(curthread, SIG_SETMASK, oldset, NULL, 0))
panic("%s: Invalid operation for kern_sigprocmask()",
__func__);
}
void
fiov_init(struct fuse_iov *fiov, size_t size)
{
uint32_t msize = FU_AT_LEAST(size);
debug_printf("fiov=%p, size=%zd\n", fiov, size);
fiov->len = 0;
fiov->base = malloc(msize, M_FUSEMSG, M_WAITOK | M_ZERO);
fiov->allocated_size = msize;
fiov->credit = fuse_iov_credit;
}
void
fiov_teardown(struct fuse_iov *fiov)
{
debug_printf("fiov=%p\n", fiov);
MPASS(fiov->base != NULL);
free(fiov->base, M_FUSEMSG);
}
void
fiov_adjust(struct fuse_iov *fiov, size_t size)
{
debug_printf("fiov=%p, size=%zd\n", fiov, size);
if (fiov->allocated_size < size ||
(fuse_iov_permanent_bufsize >= 0 &&
fiov->allocated_size - size > fuse_iov_permanent_bufsize &&
--fiov->credit < 0)) {
fiov->base = realloc(fiov->base, FU_AT_LEAST(size), M_FUSEMSG,
M_WAITOK | M_ZERO);
if (!fiov->base) {
panic("FUSE: realloc failed");
}
fiov->allocated_size = FU_AT_LEAST(size);
fiov->credit = fuse_iov_credit;
}
fiov->len = size;
}
void
fiov_refresh(struct fuse_iov *fiov)
{
debug_printf("fiov=%p\n", fiov);
bzero(fiov->base, fiov->len);
fiov_adjust(fiov, 0);
}
static int
fticket_ctor(void *mem, int size, void *arg, int flags)
{
struct fuse_ticket *ftick = mem;
struct fuse_data *data = arg;
debug_printf("ftick=%p data=%p\n", ftick, data);
FUSE_ASSERT_MS_DONE(ftick);
FUSE_ASSERT_AW_DONE(ftick);
ftick->tk_data = data;
if (ftick->tk_unique != 0)
fticket_refresh(ftick);
/* May be truncated to 32 bits */
ftick->tk_unique = atomic_fetchadd_long(&data->ticketer, 1);
if (ftick->tk_unique == 0)
ftick->tk_unique = atomic_fetchadd_long(&data->ticketer, 1);
refcount_init(&ftick->tk_refcount, 1);
atomic_add_acq_int(&fuse_ticket_count, 1);
return 0;
}
static void
fticket_dtor(void *mem, int size, void *arg)
{
struct fuse_ticket *ftick = mem;
debug_printf("ftick=%p\n", ftick);
FUSE_ASSERT_MS_DONE(ftick);
FUSE_ASSERT_AW_DONE(ftick);
atomic_subtract_acq_int(&fuse_ticket_count, 1);
}
static int
fticket_init(void *mem, int size, int flags)
{
struct fuse_ticket *ftick = mem;
DEBUG("ftick=%p\n", ftick);
bzero(ftick, sizeof(struct fuse_ticket));
fiov_init(&ftick->tk_ms_fiov, sizeof(struct fuse_in_header));
ftick->tk_ms_type = FT_M_FIOV;
mtx_init(&ftick->tk_aw_mtx, "fuse answer delivery mutex", NULL, MTX_DEF);
fiov_init(&ftick->tk_aw_fiov, 0);
ftick->tk_aw_type = FT_A_FIOV;
return 0;
}
static void
fticket_fini(void *mem, int size)
{
struct fuse_ticket *ftick = mem;
DEBUG("ftick=%p\n", ftick);
fiov_teardown(&ftick->tk_ms_fiov);
fiov_teardown(&ftick->tk_aw_fiov);
mtx_destroy(&ftick->tk_aw_mtx);
}
static __inline struct fuse_ticket *
fticket_alloc(struct fuse_data *data)
{
return uma_zalloc_arg(ticket_zone, data, M_WAITOK);
}
static __inline void
fticket_destroy(struct fuse_ticket *ftick)
{
return uma_zfree(ticket_zone, ftick);
}
static __inline__
void
fticket_refresh(struct fuse_ticket *ftick)
{
debug_printf("ftick=%p\n", ftick);
FUSE_ASSERT_MS_DONE(ftick);
FUSE_ASSERT_AW_DONE(ftick);
fiov_refresh(&ftick->tk_ms_fiov);
ftick->tk_ms_bufdata = NULL;
ftick->tk_ms_bufsize = 0;
ftick->tk_ms_type = FT_M_FIOV;
bzero(&ftick->tk_aw_ohead, sizeof(struct fuse_out_header));
fiov_refresh(&ftick->tk_aw_fiov);
ftick->tk_aw_errno = 0;
ftick->tk_aw_bufdata = NULL;
ftick->tk_aw_bufsize = 0;
ftick->tk_aw_type = FT_A_FIOV;
ftick->tk_flag = 0;
}
static int
fticket_wait_answer(struct fuse_ticket *ftick)
{
sigset_t tset;
int err = 0;
struct fuse_data *data;
debug_printf("ftick=%p\n", ftick);
fuse_lck_mtx_lock(ftick->tk_aw_mtx);
if (fticket_answered(ftick)) {
goto out;
}
data = ftick->tk_data;
if (fdata_get_dead(data)) {
err = ENOTCONN;
fticket_set_answered(ftick);
goto out;
}
fuse_block_sigs(&tset);
err = msleep(ftick, &ftick->tk_aw_mtx, PCATCH, "fu_ans",
data->daemon_timeout * hz);
fuse_restore_sigs(&tset);
if (err == EAGAIN) { /* same as EWOULDBLOCK */
#ifdef XXXIP /* die conditionally */
if (!fdata_get_dead(data)) {
fdata_set_dead(data);
}
#endif
err = ETIMEDOUT;
fticket_set_answered(ftick);
}
out:
if (!(err || fticket_answered(ftick))) {
debug_printf("FUSE: requester was woken up but still no answer");
err = ENXIO;
}
fuse_lck_mtx_unlock(ftick->tk_aw_mtx);
return err;
}
static __inline__
int
fticket_aw_pull_uio(struct fuse_ticket *ftick, struct uio *uio)
{
int err = 0;
size_t len = uio_resid(uio);
debug_printf("ftick=%p, uio=%p\n", ftick, uio);
if (len) {
switch (ftick->tk_aw_type) {
case FT_A_FIOV:
fiov_adjust(fticket_resp(ftick), len);
err = uiomove(fticket_resp(ftick)->base, len, uio);
if (err) {
debug_printf("FUSE: FT_A_FIOV: error is %d"
" (%p, %zd, %p)\n",
err, fticket_resp(ftick)->base,
len, uio);
}
break;
case FT_A_BUF:
ftick->tk_aw_bufsize = len;
err = uiomove(ftick->tk_aw_bufdata, len, uio);
if (err) {
debug_printf("FUSE: FT_A_BUF: error is %d"
" (%p, %zd, %p)\n",
err, ftick->tk_aw_bufdata, len, uio);
}
break;
default:
panic("FUSE: unknown answer type for ticket %p", ftick);
}
}
return err;
}
int
fticket_pull(struct fuse_ticket *ftick, struct uio *uio)
{
int err = 0;
debug_printf("ftick=%p, uio=%p\n", ftick, uio);
if (ftick->tk_aw_ohead.error) {
return 0;
}
err = fuse_body_audit(ftick, uio_resid(uio));
if (!err) {
err = fticket_aw_pull_uio(ftick, uio);
}
return err;
}
struct fuse_data *
fdata_alloc(struct cdev *fdev, struct ucred *cred)
{
struct fuse_data *data;
debug_printf("fdev=%p\n", fdev);
data = malloc(sizeof(struct fuse_data), M_FUSEMSG, M_WAITOK | M_ZERO);
data->fdev = fdev;
mtx_init(&data->ms_mtx, "fuse message list mutex", NULL, MTX_DEF);
STAILQ_INIT(&data->ms_head);
mtx_init(&data->aw_mtx, "fuse answer list mutex", NULL, MTX_DEF);
TAILQ_INIT(&data->aw_head);
data->daemoncred = crhold(cred);
data->daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT;
sx_init(&data->rename_lock, "fuse rename lock");
data->ref = 1;
return data;
}
void
fdata_trydestroy(struct fuse_data *data)
{
DEBUG("data=%p data.mp=%p data.fdev=%p data.flags=%04x\n",
data, data->mp, data->fdev, data->dataflags);
DEBUG("destroy: data=%p\n", data);
data->ref--;
MPASS(data->ref >= 0);
if (data->ref != 0)
return;
/* Driving off stage all that stuff thrown at device... */
mtx_destroy(&data->ms_mtx);
mtx_destroy(&data->aw_mtx);
sx_destroy(&data->rename_lock);
crfree(data->daemoncred);
free(data, M_FUSEMSG);
}
void
fdata_set_dead(struct fuse_data *data)
{
debug_printf("data=%p\n", data);
FUSE_LOCK();
if (fdata_get_dead(data)) {
FUSE_UNLOCK();
return;
}
fuse_lck_mtx_lock(data->ms_mtx);
data->dataflags |= FSESS_DEAD;
wakeup_one(data);
selwakeuppri(&data->ks_rsel, PZERO + 1);
wakeup(&data->ticketer);
fuse_lck_mtx_unlock(data->ms_mtx);
FUSE_UNLOCK();
}
struct fuse_ticket *
fuse_ticket_fetch(struct fuse_data *data)
{
int err = 0;
struct fuse_ticket *ftick;
debug_printf("data=%p\n", data);
ftick = fticket_alloc(data);
if (!(data->dataflags & FSESS_INITED)) {
/* Sleep until get answer for INIT messsage */
FUSE_LOCK();
if (!(data->dataflags & FSESS_INITED) && data->ticketer > 2) {
err = msleep(&data->ticketer, &fuse_mtx, PCATCH | PDROP,
"fu_ini", 0);
if (err)
fdata_set_dead(data);
} else
FUSE_UNLOCK();
}
return ftick;
}
int
fuse_ticket_drop(struct fuse_ticket *ftick)
{
int die;
die = refcount_release(&ftick->tk_refcount);
debug_printf("ftick=%p refcount=%d\n", ftick, ftick->tk_refcount);
if (die)
fticket_destroy(ftick);
return die;
}
void
fuse_insert_callback(struct fuse_ticket *ftick, fuse_handler_t * handler)
{
debug_printf("ftick=%p, handler=%p data=%p\n", ftick, ftick->tk_data,
handler);
if (fdata_get_dead(ftick->tk_data)) {
return;
}
ftick->tk_aw_handler = handler;
fuse_lck_mtx_lock(ftick->tk_data->aw_mtx);
fuse_aw_push(ftick);
fuse_lck_mtx_unlock(ftick->tk_data->aw_mtx);
}
void
fuse_insert_message(struct fuse_ticket *ftick)
{
debug_printf("ftick=%p\n", ftick);
if (ftick->tk_flag & FT_DIRTY) {
panic("FUSE: ticket reused without being refreshed");
}
ftick->tk_flag |= FT_DIRTY;
if (fdata_get_dead(ftick->tk_data)) {
return;
}
fuse_lck_mtx_lock(ftick->tk_data->ms_mtx);
fuse_ms_push(ftick);
wakeup_one(ftick->tk_data);
selwakeuppri(&ftick->tk_data->ks_rsel, PZERO + 1);
fuse_lck_mtx_unlock(ftick->tk_data->ms_mtx);
}
static int
fuse_body_audit(struct fuse_ticket *ftick, size_t blen)
{
int err = 0;
enum fuse_opcode opcode;
debug_printf("ftick=%p, blen = %zu\n", ftick, blen);
opcode = fticket_opcode(ftick);
switch (opcode) {
case FUSE_LOOKUP:
err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
break;
case FUSE_FORGET:
panic("FUSE: a handler has been intalled for FUSE_FORGET");
break;
case FUSE_GETATTR:
err = (blen == sizeof(struct fuse_attr_out)) ? 0 : EINVAL;
break;
case FUSE_SETATTR:
err = (blen == sizeof(struct fuse_attr_out)) ? 0 : EINVAL;
break;
case FUSE_READLINK:
err = (PAGE_SIZE >= blen) ? 0 : EINVAL;
break;
case FUSE_SYMLINK:
err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
break;
case FUSE_MKNOD:
err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
break;
case FUSE_MKDIR:
err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
break;
case FUSE_UNLINK:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_RMDIR:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_RENAME:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_LINK:
err = (blen == sizeof(struct fuse_entry_out)) ? 0 : EINVAL;
break;
case FUSE_OPEN:
err = (blen == sizeof(struct fuse_open_out)) ? 0 : EINVAL;
break;
case FUSE_READ:
err = (((struct fuse_read_in *)(
(char *)ftick->tk_ms_fiov.base +
sizeof(struct fuse_in_header)
))->size >= blen) ? 0 : EINVAL;
break;
case FUSE_WRITE:
err = (blen == sizeof(struct fuse_write_out)) ? 0 : EINVAL;
break;
case FUSE_STATFS:
if (fuse_libabi_geq(ftick->tk_data, 7, 4)) {
err = (blen == sizeof(struct fuse_statfs_out)) ?
0 : EINVAL;
} else {
err = (blen == FUSE_COMPAT_STATFS_SIZE) ? 0 : EINVAL;
}
break;
case FUSE_RELEASE:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_FSYNC:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_SETXATTR:
panic("FUSE_SETXATTR implementor has forgotten to define a"
" response body format check");
break;
case FUSE_GETXATTR:
panic("FUSE_GETXATTR implementor has forgotten to define a"
" response body format check");
break;
case FUSE_LISTXATTR:
panic("FUSE_LISTXATTR implementor has forgotten to define a"
" response body format check");
break;
case FUSE_REMOVEXATTR:
panic("FUSE_REMOVEXATTR implementor has forgotten to define a"
" response body format check");
break;
case FUSE_FLUSH:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_INIT:
if (blen == sizeof(struct fuse_init_out) || blen == 8) {
err = 0;
} else {
err = EINVAL;
}
break;
case FUSE_OPENDIR:
err = (blen == sizeof(struct fuse_open_out)) ? 0 : EINVAL;
break;
case FUSE_READDIR:
err = (((struct fuse_read_in *)(
(char *)ftick->tk_ms_fiov.base +
sizeof(struct fuse_in_header)
))->size >= blen) ? 0 : EINVAL;
break;
case FUSE_RELEASEDIR:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_FSYNCDIR:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_GETLK:
panic("FUSE: no response body format check for FUSE_GETLK");
break;
case FUSE_SETLK:
panic("FUSE: no response body format check for FUSE_SETLK");
break;
case FUSE_SETLKW:
panic("FUSE: no response body format check for FUSE_SETLKW");
break;
case FUSE_ACCESS:
err = (blen == 0) ? 0 : EINVAL;
break;
case FUSE_CREATE:
err = (blen == sizeof(struct fuse_entry_out) +
sizeof(struct fuse_open_out)) ? 0 : EINVAL;
break;
case FUSE_DESTROY:
err = (blen == 0) ? 0 : EINVAL;
break;
default:
panic("FUSE: opcodes out of sync (%d)\n", opcode);
}
return err;
}
static void
fuse_setup_ihead(struct fuse_in_header *ihead,
struct fuse_ticket *ftick,
uint64_t nid,
enum fuse_opcode op,
size_t blen,
pid_t pid,
struct ucred *cred)
{
ihead->len = sizeof(*ihead) + blen;
ihead->unique = ftick->tk_unique;
ihead->nodeid = nid;
ihead->opcode = op;
debug_printf("ihead=%p, ftick=%p, nid=%ju, op=%d, blen=%zu\n",
ihead, ftick, (uintmax_t)nid, op, blen);
ihead->pid = pid;
ihead->uid = cred->cr_uid;
ihead->gid = cred->cr_rgid;
}
/*
* fuse_standard_handler just pulls indata and wakes up pretender.
* Doesn't try to interpret data, that's left for the pretender.
* Though might do a basic size verification before the pull-in takes place
*/
static int
fuse_standard_handler(struct fuse_ticket *ftick, struct uio *uio)
{
int err = 0;
debug_printf("ftick=%p, uio=%p\n", ftick, uio);
err = fticket_pull(ftick, uio);
fuse_lck_mtx_lock(ftick->tk_aw_mtx);
if (!fticket_answered(ftick)) {
fticket_set_answered(ftick);
ftick->tk_aw_errno = err;
wakeup(ftick);
}
fuse_lck_mtx_unlock(ftick->tk_aw_mtx);
return err;
}
void
fdisp_make_pid(struct fuse_dispatcher *fdip,
enum fuse_opcode op,
struct mount *mp,
uint64_t nid,
pid_t pid,
struct ucred *cred)
{
struct fuse_data *data = fuse_get_mpdata(mp);
debug_printf("fdip=%p, op=%d, mp=%p, nid=%ju\n",
fdip, op, mp, (uintmax_t)nid);
if (fdip->tick) {
fticket_refresh(fdip->tick);
} else {
fdip->tick = fuse_ticket_fetch(data);
}
FUSE_DIMALLOC(&fdip->tick->tk_ms_fiov, fdip->finh,
fdip->indata, fdip->iosize);
fuse_setup_ihead(fdip->finh, fdip->tick, nid, op, fdip->iosize, pid, cred);
}
void
fdisp_make(struct fuse_dispatcher *fdip,
enum fuse_opcode op,
struct mount *mp,
uint64_t nid,
struct thread *td,
struct ucred *cred)
{
RECTIFY_TDCR(td, cred);
return fdisp_make_pid(fdip, op, mp, nid, td->td_proc->p_pid, cred);
}
void
fdisp_make_vp(struct fuse_dispatcher *fdip,
enum fuse_opcode op,
struct vnode *vp,
struct thread *td,
struct ucred *cred)
{
debug_printf("fdip=%p, op=%d, vp=%p\n", fdip, op, vp);
RECTIFY_TDCR(td, cred);
return fdisp_make_pid(fdip, op, vnode_mount(vp), VTOI(vp),
td->td_proc->p_pid, cred);
}
int
fdisp_wait_answ(struct fuse_dispatcher *fdip)
{
int err = 0;
fdip->answ_stat = 0;
fuse_insert_callback(fdip->tick, fuse_standard_handler);
fuse_insert_message(fdip->tick);
if ((err = fticket_wait_answer(fdip->tick))) {
debug_printf("IPC: interrupted, err = %d\n", err);
fuse_lck_mtx_lock(fdip->tick->tk_aw_mtx);
if (fticket_answered(fdip->tick)) {
/*
* Just between noticing the interrupt and getting here,
* the standard handler has completed his job.
* So we drop the ticket and exit as usual.
*/
debug_printf("IPC: already answered\n");
fuse_lck_mtx_unlock(fdip->tick->tk_aw_mtx);
goto out;
} else {
/*
* So we were faster than the standard handler.
* Then by setting the answered flag we get *him*
* to drop the ticket.
*/
debug_printf("IPC: setting to answered\n");
fticket_set_answered(fdip->tick);
fuse_lck_mtx_unlock(fdip->tick->tk_aw_mtx);
return err;
}
}
debug_printf("IPC: not interrupted, err = %d\n", err);
if (fdip->tick->tk_aw_errno) {
debug_printf("IPC: explicit EIO-ing, tk_aw_errno = %d\n",
fdip->tick->tk_aw_errno);
err = EIO;
goto out;
}
if ((err = fdip->tick->tk_aw_ohead.error)) {
debug_printf("IPC: setting status to %d\n",
fdip->tick->tk_aw_ohead.error);
/*
* This means a "proper" fuse syscall error.
* We record this value so the caller will
* be able to know it's not a boring messaging
* failure, if she wishes so (and if not, she can
* just simply propagate the return value of this routine).
* [XXX Maybe a bitflag would do the job too,
* if other flags needed, this will be converted thusly.]
*/
fdip->answ_stat = err;
goto out;
}
fdip->answ = fticket_resp(fdip->tick)->base;
fdip->iosize = fticket_resp(fdip->tick)->len;
debug_printf("IPC: all is well\n");
return 0;
out:
debug_printf("IPC: dropping ticket, err = %d\n", err);
return err;
}
void
fuse_ipc_init(void)
{
ticket_zone = uma_zcreate("fuse_ticket", sizeof(struct fuse_ticket),
fticket_ctor, fticket_dtor, fticket_init, fticket_fini,
UMA_ALIGN_PTR, 0);
}
void
fuse_ipc_destroy(void)
{
uma_zdestroy(ticket_zone);
}