diff --git a/sys/fs/cuse/cuse.c b/sys/fs/cuse/cuse.c
index 41f8bdbe2bfe..566f463da22a 100644
--- a/sys/fs/cuse/cuse.c
+++ b/sys/fs/cuse/cuse.c
@@ -1,2043 +1,2043 @@
/* $FreeBSD$ */
/*-
* Copyright (c) 2010-2022 Hans Petter Selasky
*
* 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 THE 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 THE 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/stdint.h>
#include <sys/stddef.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/linker_set.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/unistd.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/uio.h>
#include <sys/poll.h>
#include <sys/sx.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/fcntl.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/selinfo.h>
#include <sys/ptrace.h>
#include <sys/sysent.h>
#include <machine/bus.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pager.h>
#include <fs/cuse/cuse_defs.h>
#include <fs/cuse/cuse_ioctl.h>
/* set this define to zero to disable this feature */
#define CUSE_COPY_BUFFER_MAX \
CUSE_BUFFER_MAX
#define CUSE_ALLOC_PAGES_MAX \
(CUSE_ALLOC_BYTES_MAX / PAGE_SIZE)
#if (CUSE_ALLOC_PAGES_MAX == 0)
#error "PAGE_SIZE is too big!"
#endif
static int
cuse_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
case MOD_UNLOAD:
return (0);
default:
return (EOPNOTSUPP);
}
}
static moduledata_t cuse_mod = {
.name = "cuse",
.evhand = &cuse_modevent,
};
DECLARE_MODULE(cuse, cuse_mod, SI_SUB_DEVFS, SI_ORDER_FIRST);
MODULE_VERSION(cuse, 1);
/*
* Prevent cuse4bsd.ko and cuse.ko from loading at the same time by
* declaring support for the cuse4bsd interface in cuse.ko:
*/
MODULE_VERSION(cuse4bsd, 1);
#ifdef FEATURE
FEATURE(cuse, "Userspace character devices");
#endif
struct cuse_command;
struct cuse_server;
struct cuse_client;
struct cuse_client_command {
TAILQ_ENTRY(cuse_client_command) entry;
struct cuse_command sub;
struct sx sx;
struct cv cv;
struct thread *entered;
struct cuse_client *client;
struct proc *proc_curr;
int proc_refs;
int got_signal;
int error;
int command;
};
struct cuse_memory {
TAILQ_ENTRY(cuse_memory) entry;
vm_object_t object;
uint32_t page_count;
uint32_t alloc_nr;
};
struct cuse_server_dev {
TAILQ_ENTRY(cuse_server_dev) entry;
struct cuse_server *server;
struct cdev *kern_dev;
struct cuse_dev *user_dev;
};
struct cuse_server {
TAILQ_ENTRY(cuse_server) entry;
TAILQ_HEAD(, cuse_client_command) head;
TAILQ_HEAD(, cuse_server_dev) hdev;
TAILQ_HEAD(, cuse_client) hcli;
TAILQ_HEAD(, cuse_memory) hmem;
struct mtx mtx;
struct cv cv;
struct selinfo selinfo;
pid_t pid;
int is_closing;
int refs;
};
struct cuse_client {
TAILQ_ENTRY(cuse_client) entry;
TAILQ_ENTRY(cuse_client) entry_ref;
struct cuse_client_command cmds[CUSE_CMD_MAX];
struct cuse_server *server;
struct cuse_server_dev *server_dev;
uintptr_t read_base;
uintptr_t write_base;
int read_length;
int write_length;
uint8_t read_buffer[CUSE_COPY_BUFFER_MAX] __aligned(4);
uint8_t write_buffer[CUSE_COPY_BUFFER_MAX] __aligned(4);
uint8_t ioctl_buffer[CUSE_BUFFER_MAX] __aligned(4);
int fflags; /* file flags */
int cflags; /* client flags */
#define CUSE_CLI_IS_CLOSING 0x01
#define CUSE_CLI_KNOTE_NEED_READ 0x02
#define CUSE_CLI_KNOTE_NEED_WRITE 0x04
#define CUSE_CLI_KNOTE_HAS_READ 0x08
#define CUSE_CLI_KNOTE_HAS_WRITE 0x10
};
#define CUSE_CLIENT_CLOSING(pcc) \
((pcc)->cflags & CUSE_CLI_IS_CLOSING)
static MALLOC_DEFINE(M_CUSE, "cuse", "CUSE memory");
static TAILQ_HEAD(, cuse_server) cuse_server_head;
static struct mtx cuse_global_mtx;
static struct cdev *cuse_dev;
static struct cuse_server *cuse_alloc_unit[CUSE_DEVICES_MAX];
static int cuse_alloc_unit_id[CUSE_DEVICES_MAX];
static void cuse_server_wakeup_all_client_locked(struct cuse_server *pcs);
static void cuse_client_kqfilter_read_detach(struct knote *kn);
static void cuse_client_kqfilter_write_detach(struct knote *kn);
static int cuse_client_kqfilter_read_event(struct knote *kn, long hint);
static int cuse_client_kqfilter_write_event(struct knote *kn, long hint);
static struct filterops cuse_client_kqfilter_read_ops = {
.f_isfd = 1,
.f_detach = cuse_client_kqfilter_read_detach,
.f_event = cuse_client_kqfilter_read_event,
};
static struct filterops cuse_client_kqfilter_write_ops = {
.f_isfd = 1,
.f_detach = cuse_client_kqfilter_write_detach,
.f_event = cuse_client_kqfilter_write_event,
};
static d_open_t cuse_client_open;
static d_close_t cuse_client_close;
static d_ioctl_t cuse_client_ioctl;
static d_read_t cuse_client_read;
static d_write_t cuse_client_write;
static d_poll_t cuse_client_poll;
static d_mmap_single_t cuse_client_mmap_single;
static d_kqfilter_t cuse_client_kqfilter;
static struct cdevsw cuse_client_devsw = {
.d_version = D_VERSION,
.d_open = cuse_client_open,
.d_close = cuse_client_close,
.d_ioctl = cuse_client_ioctl,
.d_name = "cuse_client",
.d_flags = D_TRACKCLOSE,
.d_read = cuse_client_read,
.d_write = cuse_client_write,
.d_poll = cuse_client_poll,
.d_mmap_single = cuse_client_mmap_single,
.d_kqfilter = cuse_client_kqfilter,
};
static d_open_t cuse_server_open;
static d_close_t cuse_server_close;
static d_ioctl_t cuse_server_ioctl;
static d_read_t cuse_server_read;
static d_write_t cuse_server_write;
static d_poll_t cuse_server_poll;
static d_mmap_single_t cuse_server_mmap_single;
static struct cdevsw cuse_server_devsw = {
.d_version = D_VERSION,
.d_open = cuse_server_open,
.d_close = cuse_server_close,
.d_ioctl = cuse_server_ioctl,
.d_name = "cuse_server",
.d_flags = D_TRACKCLOSE,
.d_read = cuse_server_read,
.d_write = cuse_server_write,
.d_poll = cuse_server_poll,
.d_mmap_single = cuse_server_mmap_single,
};
static void cuse_client_is_closing(struct cuse_client *);
static int cuse_free_unit_by_id_locked(struct cuse_server *, int);
static void
cuse_global_lock(void)
{
mtx_lock(&cuse_global_mtx);
}
static void
cuse_global_unlock(void)
{
mtx_unlock(&cuse_global_mtx);
}
static void
cuse_server_lock(struct cuse_server *pcs)
{
mtx_lock(&pcs->mtx);
}
static void
cuse_server_unlock(struct cuse_server *pcs)
{
mtx_unlock(&pcs->mtx);
}
static bool
cuse_server_is_locked(struct cuse_server *pcs)
{
return (mtx_owned(&pcs->mtx));
}
static void
cuse_cmd_lock(struct cuse_client_command *pccmd)
{
sx_xlock(&pccmd->sx);
}
static void
cuse_cmd_unlock(struct cuse_client_command *pccmd)
{
sx_xunlock(&pccmd->sx);
}
static void
cuse_kern_init(void *arg)
{
TAILQ_INIT(&cuse_server_head);
mtx_init(&cuse_global_mtx, "cuse-global-mtx", NULL, MTX_DEF);
cuse_dev = make_dev(&cuse_server_devsw, 0,
UID_ROOT, GID_OPERATOR, 0600, "cuse");
printf("Cuse v%d.%d.%d @ /dev/cuse\n",
(CUSE_VERSION >> 16) & 0xFF, (CUSE_VERSION >> 8) & 0xFF,
(CUSE_VERSION >> 0) & 0xFF);
}
SYSINIT(cuse_kern_init, SI_SUB_DEVFS, SI_ORDER_ANY, cuse_kern_init, NULL);
static void
cuse_kern_uninit(void *arg)
{
void *ptr;
while (1) {
printf("Cuse: Please exit all /dev/cuse instances "
"and processes which have used this device.\n");
pause("DRAIN", 2 * hz);
cuse_global_lock();
ptr = TAILQ_FIRST(&cuse_server_head);
cuse_global_unlock();
if (ptr == NULL)
break;
}
if (cuse_dev != NULL)
destroy_dev(cuse_dev);
mtx_destroy(&cuse_global_mtx);
}
SYSUNINIT(cuse_kern_uninit, SI_SUB_DEVFS, SI_ORDER_ANY, cuse_kern_uninit, 0);
static int
cuse_server_get(struct cuse_server **ppcs)
{
struct cuse_server *pcs;
int error;
error = devfs_get_cdevpriv((void **)&pcs);
if (error != 0) {
*ppcs = NULL;
return (error);
}
if (pcs->is_closing) {
*ppcs = NULL;
return (EINVAL);
}
*ppcs = pcs;
return (0);
}
static void
cuse_server_is_closing(struct cuse_server *pcs)
{
struct cuse_client *pcc;
if (pcs->is_closing)
return;
pcs->is_closing = 1;
TAILQ_FOREACH(pcc, &pcs->hcli, entry) {
cuse_client_is_closing(pcc);
}
}
static struct cuse_client_command *
cuse_server_find_command(struct cuse_server *pcs, struct thread *td)
{
struct cuse_client *pcc;
int n;
if (pcs->is_closing)
goto done;
TAILQ_FOREACH(pcc, &pcs->hcli, entry) {
if (CUSE_CLIENT_CLOSING(pcc))
continue;
for (n = 0; n != CUSE_CMD_MAX; n++) {
if (pcc->cmds[n].entered == td)
return (&pcc->cmds[n]);
}
}
done:
return (NULL);
}
static void
cuse_str_filter(char *ptr)
{
int c;
while (((c = *ptr) != 0)) {
if ((c >= 'a') && (c <= 'z')) {
ptr++;
continue;
}
if ((c >= 'A') && (c <= 'Z')) {
ptr++;
continue;
}
if ((c >= '0') && (c <= '9')) {
ptr++;
continue;
}
if ((c == '.') || (c == '_') || (c == '/')) {
ptr++;
continue;
}
*ptr = '_';
ptr++;
}
}
static int
cuse_convert_error(int error)
{
; /* indent fix */
switch (error) {
case CUSE_ERR_NONE:
return (0);
case CUSE_ERR_BUSY:
return (EBUSY);
case CUSE_ERR_WOULDBLOCK:
return (EWOULDBLOCK);
case CUSE_ERR_INVALID:
return (EINVAL);
case CUSE_ERR_NO_MEMORY:
return (ENOMEM);
case CUSE_ERR_FAULT:
return (EFAULT);
case CUSE_ERR_SIGNAL:
return (EINTR);
case CUSE_ERR_NO_DEVICE:
return (ENODEV);
default:
return (ENXIO);
}
}
static void
cuse_vm_memory_free(struct cuse_memory *mem)
{
/* last user is gone - free */
vm_object_deallocate(mem->object);
/* free CUSE memory */
free(mem, M_CUSE);
}
static int
cuse_server_alloc_memory(struct cuse_server *pcs, uint32_t alloc_nr,
uint32_t page_count)
{
struct cuse_memory *temp;
struct cuse_memory *mem;
vm_object_t object;
int error;
mem = malloc(sizeof(*mem), M_CUSE, M_WAITOK | M_ZERO);
object = vm_pager_allocate(OBJT_SWAP, NULL, PAGE_SIZE * page_count,
VM_PROT_DEFAULT, 0, curthread->td_ucred);
if (object == NULL) {
error = ENOMEM;
goto error_0;
}
cuse_server_lock(pcs);
/* check if allocation number already exists */
TAILQ_FOREACH(temp, &pcs->hmem, entry) {
if (temp->alloc_nr == alloc_nr)
break;
}
if (temp != NULL) {
cuse_server_unlock(pcs);
error = EBUSY;
goto error_1;
}
mem->object = object;
mem->page_count = page_count;
mem->alloc_nr = alloc_nr;
TAILQ_INSERT_TAIL(&pcs->hmem, mem, entry);
cuse_server_unlock(pcs);
return (0);
error_1:
vm_object_deallocate(object);
error_0:
free(mem, M_CUSE);
return (error);
}
static int
cuse_server_free_memory(struct cuse_server *pcs, uint32_t alloc_nr)
{
struct cuse_memory *mem;
cuse_server_lock(pcs);
TAILQ_FOREACH(mem, &pcs->hmem, entry) {
if (mem->alloc_nr == alloc_nr)
break;
}
if (mem == NULL) {
cuse_server_unlock(pcs);
return (EINVAL);
}
TAILQ_REMOVE(&pcs->hmem, mem, entry);
cuse_server_unlock(pcs);
cuse_vm_memory_free(mem);
return (0);
}
static int
cuse_client_get(struct cuse_client **ppcc)
{
struct cuse_client *pcc;
int error;
/* try to get private data */
error = devfs_get_cdevpriv((void **)&pcc);
if (error != 0) {
*ppcc = NULL;
return (error);
}
if (CUSE_CLIENT_CLOSING(pcc) || pcc->server->is_closing) {
*ppcc = NULL;
return (EINVAL);
}
*ppcc = pcc;
return (0);
}
static void
cuse_client_is_closing(struct cuse_client *pcc)
{
struct cuse_client_command *pccmd;
uint32_t n;
if (CUSE_CLIENT_CLOSING(pcc))
return;
pcc->cflags |= CUSE_CLI_IS_CLOSING;
pcc->server_dev = NULL;
for (n = 0; n != CUSE_CMD_MAX; n++) {
pccmd = &pcc->cmds[n];
if (pccmd->entry.tqe_prev != NULL) {
TAILQ_REMOVE(&pcc->server->head, pccmd, entry);
pccmd->entry.tqe_prev = NULL;
}
cv_broadcast(&pccmd->cv);
}
}
static void
cuse_client_send_command_locked(struct cuse_client_command *pccmd,
uintptr_t data_ptr, unsigned long arg, int fflags, int ioflag)
{
unsigned long cuse_fflags = 0;
struct cuse_server *pcs;
if (fflags & FREAD)
cuse_fflags |= CUSE_FFLAG_READ;
if (fflags & FWRITE)
cuse_fflags |= CUSE_FFLAG_WRITE;
if (ioflag & IO_NDELAY)
cuse_fflags |= CUSE_FFLAG_NONBLOCK;
#if defined(__LP64__)
if (SV_CURPROC_FLAG(SV_ILP32))
cuse_fflags |= CUSE_FFLAG_COMPAT32;
#endif
pccmd->sub.fflags = cuse_fflags;
pccmd->sub.data_pointer = data_ptr;
pccmd->sub.argument = arg;
pcs = pccmd->client->server;
if ((pccmd->entry.tqe_prev == NULL) &&
(CUSE_CLIENT_CLOSING(pccmd->client) == 0) &&
(pcs->is_closing == 0)) {
TAILQ_INSERT_TAIL(&pcs->head, pccmd, entry);
cv_signal(&pcs->cv);
}
}
static void
cuse_client_got_signal(struct cuse_client_command *pccmd)
{
struct cuse_server *pcs;
pccmd->got_signal = 1;
pccmd = &pccmd->client->cmds[CUSE_CMD_SIGNAL];
pcs = pccmd->client->server;
if ((pccmd->entry.tqe_prev == NULL) &&
(CUSE_CLIENT_CLOSING(pccmd->client) == 0) &&
(pcs->is_closing == 0)) {
TAILQ_INSERT_TAIL(&pcs->head, pccmd, entry);
cv_signal(&pcs->cv);
}
}
static int
cuse_client_receive_command_locked(struct cuse_client_command *pccmd,
uint8_t *arg_ptr, uint32_t arg_len)
{
struct cuse_server *pcs;
int error;
pcs = pccmd->client->server;
error = 0;
pccmd->proc_curr = curthread->td_proc;
if (CUSE_CLIENT_CLOSING(pccmd->client) || pcs->is_closing) {
error = CUSE_ERR_OTHER;
goto done;
}
while (pccmd->command == CUSE_CMD_NONE) {
if (error != 0) {
cv_wait(&pccmd->cv, &pcs->mtx);
} else {
error = cv_wait_sig(&pccmd->cv, &pcs->mtx);
if (error != 0)
cuse_client_got_signal(pccmd);
}
if (CUSE_CLIENT_CLOSING(pccmd->client) || pcs->is_closing) {
error = CUSE_ERR_OTHER;
goto done;
}
}
error = pccmd->error;
pccmd->command = CUSE_CMD_NONE;
cv_signal(&pccmd->cv);
done:
/* wait until all process references are gone */
pccmd->proc_curr = NULL;
while (pccmd->proc_refs != 0)
cv_wait(&pccmd->cv, &pcs->mtx);
return (error);
}
/*------------------------------------------------------------------------*
* CUSE SERVER PART
*------------------------------------------------------------------------*/
static void
cuse_server_free_dev(struct cuse_server_dev *pcsd)
{
struct cuse_server *pcs;
struct cuse_client *pcc;
/* get server pointer */
pcs = pcsd->server;
/* prevent creation of more devices */
cuse_server_lock(pcs);
if (pcsd->kern_dev != NULL)
pcsd->kern_dev->si_drv1 = NULL;
TAILQ_FOREACH(pcc, &pcs->hcli, entry) {
if (pcc->server_dev == pcsd)
cuse_client_is_closing(pcc);
}
cuse_server_unlock(pcs);
/* destroy device, if any */
if (pcsd->kern_dev != NULL) {
/* destroy device synchronously */
destroy_dev(pcsd->kern_dev);
}
free(pcsd, M_CUSE);
}
static void
cuse_server_unref(struct cuse_server *pcs)
{
struct cuse_server_dev *pcsd;
struct cuse_memory *mem;
cuse_server_lock(pcs);
if (--(pcs->refs) != 0) {
cuse_server_unlock(pcs);
return;
}
cuse_server_is_closing(pcs);
/* final client wakeup, if any */
cuse_server_wakeup_all_client_locked(pcs);
cuse_global_lock();
TAILQ_REMOVE(&cuse_server_head, pcs, entry);
cuse_global_unlock();
while ((pcsd = TAILQ_FIRST(&pcs->hdev)) != NULL) {
TAILQ_REMOVE(&pcs->hdev, pcsd, entry);
cuse_server_unlock(pcs);
cuse_server_free_dev(pcsd);
cuse_server_lock(pcs);
}
cuse_free_unit_by_id_locked(pcs, -1);
while ((mem = TAILQ_FIRST(&pcs->hmem)) != NULL) {
TAILQ_REMOVE(&pcs->hmem, mem, entry);
cuse_server_unlock(pcs);
cuse_vm_memory_free(mem);
cuse_server_lock(pcs);
}
knlist_clear(&pcs->selinfo.si_note, 1);
knlist_destroy(&pcs->selinfo.si_note);
cuse_server_unlock(pcs);
seldrain(&pcs->selinfo);
cv_destroy(&pcs->cv);
mtx_destroy(&pcs->mtx);
free(pcs, M_CUSE);
}
static int
cuse_server_do_close(struct cuse_server *pcs)
{
int retval;
cuse_server_lock(pcs);
cuse_server_is_closing(pcs);
/* final client wakeup, if any */
cuse_server_wakeup_all_client_locked(pcs);
knlist_clear(&pcs->selinfo.si_note, 1);
retval = pcs->refs;
cuse_server_unlock(pcs);
return (retval);
}
static void
cuse_server_free(void *arg)
{
struct cuse_server *pcs = arg;
/*
* The final server unref should be done by the server thread
* to prevent deadlock in the client cdevpriv destructor,
* which cannot destroy itself.
*/
while (cuse_server_do_close(pcs) != 1)
pause("W", hz);
/* drop final refcount */
cuse_server_unref(pcs);
}
static int
cuse_server_open(struct cdev *dev, int fflags, int devtype, struct thread *td)
{
struct cuse_server *pcs;
pcs = malloc(sizeof(*pcs), M_CUSE, M_WAITOK | M_ZERO);
if (devfs_set_cdevpriv(pcs, &cuse_server_free)) {
printf("Cuse: Cannot set cdevpriv.\n");
free(pcs, M_CUSE);
return (ENOMEM);
}
/* store current process ID */
pcs->pid = curproc->p_pid;
TAILQ_INIT(&pcs->head);
TAILQ_INIT(&pcs->hdev);
TAILQ_INIT(&pcs->hcli);
TAILQ_INIT(&pcs->hmem);
cv_init(&pcs->cv, "cuse-server-cv");
mtx_init(&pcs->mtx, "cuse-server-mtx", NULL, MTX_DEF);
knlist_init_mtx(&pcs->selinfo.si_note, &pcs->mtx);
cuse_global_lock();
pcs->refs++;
TAILQ_INSERT_TAIL(&cuse_server_head, pcs, entry);
cuse_global_unlock();
return (0);
}
static int
cuse_server_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct cuse_server *pcs;
if (cuse_server_get(&pcs) == 0)
cuse_server_do_close(pcs);
return (0);
}
static int
cuse_server_read(struct cdev *dev, struct uio *uio, int ioflag)
{
return (ENXIO);
}
static int
cuse_server_write(struct cdev *dev, struct uio *uio, int ioflag)
{
return (ENXIO);
}
static int
cuse_server_ioctl_copy_locked(struct cuse_server *pcs,
struct cuse_client_command *pccmd,
struct cuse_data_chunk *pchk, bool isread)
{
struct proc *p_proc;
uint32_t offset;
int error;
offset = pchk->peer_ptr - CUSE_BUF_MIN_PTR;
if (pchk->length > CUSE_BUFFER_MAX)
return (EFAULT);
if (offset >= CUSE_BUFFER_MAX)
return (EFAULT);
if ((offset + pchk->length) > CUSE_BUFFER_MAX)
return (EFAULT);
p_proc = pccmd->proc_curr;
if (p_proc == NULL)
return (ENXIO);
if (pccmd->proc_refs < 0)
return (ENOMEM);
pccmd->proc_refs++;
cuse_server_unlock(pcs);
- if (isread == false) {
+ if (!isread) {
error = copyin(
(void *)pchk->local_ptr,
pccmd->client->ioctl_buffer + offset,
pchk->length);
} else {
error = copyout(
pccmd->client->ioctl_buffer + offset,
(void *)pchk->local_ptr,
pchk->length);
}
cuse_server_lock(pcs);
pccmd->proc_refs--;
if (pccmd->proc_curr == NULL)
cv_signal(&pccmd->cv);
return (error);
}
static int
cuse_proc2proc_copy(struct proc *proc_s, vm_offset_t data_s,
struct proc *proc_d, vm_offset_t data_d, size_t len)
{
struct thread *td;
struct proc *proc_cur;
int error;
td = curthread;
proc_cur = td->td_proc;
if (proc_cur == proc_d) {
struct iovec iov = {
.iov_base = (caddr_t)data_d,
.iov_len = len,
};
struct uio uio = {
.uio_iov = &iov,
.uio_iovcnt = 1,
.uio_offset = (off_t)data_s,
.uio_resid = len,
.uio_segflg = UIO_USERSPACE,
.uio_rw = UIO_READ,
.uio_td = td,
};
PHOLD(proc_s);
error = proc_rwmem(proc_s, &uio);
PRELE(proc_s);
} else if (proc_cur == proc_s) {
struct iovec iov = {
.iov_base = (caddr_t)data_s,
.iov_len = len,
};
struct uio uio = {
.uio_iov = &iov,
.uio_iovcnt = 1,
.uio_offset = (off_t)data_d,
.uio_resid = len,
.uio_segflg = UIO_USERSPACE,
.uio_rw = UIO_WRITE,
.uio_td = td,
};
PHOLD(proc_d);
error = proc_rwmem(proc_d, &uio);
PRELE(proc_d);
} else {
error = EINVAL;
}
return (error);
}
static int
cuse_server_data_copy_locked(struct cuse_server *pcs,
struct cuse_client_command *pccmd,
struct cuse_data_chunk *pchk, bool isread)
{
struct proc *p_proc;
int error;
p_proc = pccmd->proc_curr;
if (p_proc == NULL)
return (ENXIO);
if (pccmd->proc_refs < 0)
return (ENOMEM);
pccmd->proc_refs++;
cuse_server_unlock(pcs);
- if (isread == false) {
+ if (!isread) {
error = cuse_proc2proc_copy(
curthread->td_proc, pchk->local_ptr,
p_proc, pchk->peer_ptr,
pchk->length);
} else {
error = cuse_proc2proc_copy(
p_proc, pchk->peer_ptr,
curthread->td_proc, pchk->local_ptr,
pchk->length);
}
cuse_server_lock(pcs);
pccmd->proc_refs--;
if (pccmd->proc_curr == NULL)
cv_signal(&pccmd->cv);
return (error);
}
static int
cuse_server_data_copy_optimized_locked(struct cuse_server *pcs,
struct cuse_client_command *pccmd,
struct cuse_data_chunk *pchk, bool isread)
{
uintptr_t offset;
int error;
/*
* Check if data is stored locally to avoid accessing
* other process's data space:
*/
if (isread) {
offset = pchk->peer_ptr - pccmd->client->write_base;
if (offset < (uintptr_t)pccmd->client->write_length &&
pchk->length <= (unsigned long)pccmd->client->write_length &&
offset + pchk->length <= (uintptr_t)pccmd->client->write_length) {
cuse_server_unlock(pcs);
error = copyout(pccmd->client->write_buffer + offset,
(void *)pchk->local_ptr, pchk->length);
goto done;
}
} else {
offset = pchk->peer_ptr - pccmd->client->read_base;
if (offset < (uintptr_t)pccmd->client->read_length &&
pchk->length <= (unsigned long)pccmd->client->read_length &&
offset + pchk->length <= (uintptr_t)pccmd->client->read_length) {
cuse_server_unlock(pcs);
error = copyin((void *)pchk->local_ptr,
pccmd->client->read_buffer + offset, pchk->length);
goto done;
}
}
/* use process to process copy function */
error = cuse_server_data_copy_locked(pcs, pccmd, pchk, isread);
done:
return (error);
}
static int
cuse_alloc_unit_by_id_locked(struct cuse_server *pcs, int id)
{
int n;
int x = 0;
int match;
do {
for (match = n = 0; n != CUSE_DEVICES_MAX; n++) {
if (cuse_alloc_unit[n] != NULL) {
if ((cuse_alloc_unit_id[n] ^ id) & CUSE_ID_MASK)
continue;
if ((cuse_alloc_unit_id[n] & ~CUSE_ID_MASK) == x) {
x++;
match = 1;
}
}
}
} while (match);
if (x < 256) {
for (n = 0; n != CUSE_DEVICES_MAX; n++) {
if (cuse_alloc_unit[n] == NULL) {
cuse_alloc_unit[n] = pcs;
cuse_alloc_unit_id[n] = id | x;
return (x);
}
}
}
return (-1);
}
static void
cuse_server_wakeup_locked(struct cuse_server *pcs)
{
selwakeup(&pcs->selinfo);
KNOTE_LOCKED(&pcs->selinfo.si_note, 0);
}
static void
cuse_server_wakeup_all_client_locked(struct cuse_server *pcs)
{
struct cuse_client *pcc;
TAILQ_FOREACH(pcc, &pcs->hcli, entry) {
pcc->cflags |= (CUSE_CLI_KNOTE_NEED_READ |
CUSE_CLI_KNOTE_NEED_WRITE);
}
cuse_server_wakeup_locked(pcs);
}
static int
cuse_free_unit_by_id_locked(struct cuse_server *pcs, int id)
{
int n;
int found = 0;
for (n = 0; n != CUSE_DEVICES_MAX; n++) {
if (cuse_alloc_unit[n] == pcs) {
if (cuse_alloc_unit_id[n] == id || id == -1) {
cuse_alloc_unit[n] = NULL;
cuse_alloc_unit_id[n] = 0;
found = 1;
}
}
}
return (found ? 0 : EINVAL);
}
static int
cuse_server_ioctl(struct cdev *dev, unsigned long cmd,
caddr_t data, int fflag, struct thread *td)
{
struct cuse_server *pcs;
int error;
error = cuse_server_get(&pcs);
if (error != 0)
return (error);
switch (cmd) {
struct cuse_client_command *pccmd;
struct cuse_client *pcc;
struct cuse_command *pcmd;
struct cuse_alloc_info *pai;
struct cuse_create_dev *pcd;
struct cuse_server_dev *pcsd;
struct cuse_data_chunk *pchk;
int n;
case CUSE_IOCTL_GET_COMMAND:
pcmd = (void *)data;
cuse_server_lock(pcs);
while ((pccmd = TAILQ_FIRST(&pcs->head)) == NULL) {
error = cv_wait_sig(&pcs->cv, &pcs->mtx);
if (pcs->is_closing)
error = ENXIO;
if (error) {
cuse_server_unlock(pcs);
return (error);
}
}
TAILQ_REMOVE(&pcs->head, pccmd, entry);
pccmd->entry.tqe_prev = NULL;
pccmd->entered = curthread;
*pcmd = pccmd->sub;
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_SYNC_COMMAND:
cuse_server_lock(pcs);
while ((pccmd = cuse_server_find_command(pcs, curthread)) != NULL) {
/* send sync command */
pccmd->entered = NULL;
pccmd->error = *(int *)data;
pccmd->command = CUSE_CMD_SYNC;
/* signal peer, if any */
cv_signal(&pccmd->cv);
}
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_ALLOC_UNIT:
cuse_server_lock(pcs);
n = cuse_alloc_unit_by_id_locked(pcs,
CUSE_ID_DEFAULT(0));
cuse_server_unlock(pcs);
if (n < 0)
error = ENOMEM;
else
*(int *)data = n;
break;
case CUSE_IOCTL_ALLOC_UNIT_BY_ID:
n = *(int *)data;
n = (n & CUSE_ID_MASK);
cuse_server_lock(pcs);
n = cuse_alloc_unit_by_id_locked(pcs, n);
cuse_server_unlock(pcs);
if (n < 0)
error = ENOMEM;
else
*(int *)data = n;
break;
case CUSE_IOCTL_FREE_UNIT:
n = *(int *)data;
n = CUSE_ID_DEFAULT(n);
cuse_server_lock(pcs);
error = cuse_free_unit_by_id_locked(pcs, n);
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_FREE_UNIT_BY_ID:
n = *(int *)data;
cuse_server_lock(pcs);
error = cuse_free_unit_by_id_locked(pcs, n);
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_ALLOC_MEMORY:
pai = (void *)data;
if (pai->alloc_nr >= CUSE_ALLOC_UNIT_MAX) {
error = ENOMEM;
break;
}
if (pai->page_count > CUSE_ALLOC_PAGES_MAX) {
error = ENOMEM;
break;
}
error = cuse_server_alloc_memory(pcs,
pai->alloc_nr, pai->page_count);
break;
case CUSE_IOCTL_FREE_MEMORY:
pai = (void *)data;
if (pai->alloc_nr >= CUSE_ALLOC_UNIT_MAX) {
error = ENOMEM;
break;
}
error = cuse_server_free_memory(pcs, pai->alloc_nr);
break;
case CUSE_IOCTL_GET_SIG:
cuse_server_lock(pcs);
pccmd = cuse_server_find_command(pcs, curthread);
if (pccmd != NULL) {
n = pccmd->got_signal;
pccmd->got_signal = 0;
} else {
n = 0;
}
cuse_server_unlock(pcs);
*(int *)data = n;
break;
case CUSE_IOCTL_SET_PFH:
cuse_server_lock(pcs);
pccmd = cuse_server_find_command(pcs, curthread);
if (pccmd != NULL) {
pcc = pccmd->client;
for (n = 0; n != CUSE_CMD_MAX; n++) {
pcc->cmds[n].sub.per_file_handle = *(uintptr_t *)data;
}
} else {
error = ENXIO;
}
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_CREATE_DEV:
error = priv_check(curthread, PRIV_DRIVER);
if (error)
break;
pcd = (void *)data;
/* filter input */
pcd->devname[sizeof(pcd->devname) - 1] = 0;
if (pcd->devname[0] == 0) {
error = EINVAL;
break;
}
cuse_str_filter(pcd->devname);
pcd->permissions &= 0777;
/* try to allocate a character device */
pcsd = malloc(sizeof(*pcsd), M_CUSE, M_WAITOK | M_ZERO);
pcsd->server = pcs;
pcsd->user_dev = pcd->dev;
pcsd->kern_dev = make_dev_credf(MAKEDEV_CHECKNAME,
&cuse_client_devsw, 0, NULL, pcd->user_id, pcd->group_id,
pcd->permissions, "%s", pcd->devname);
if (pcsd->kern_dev == NULL) {
free(pcsd, M_CUSE);
error = ENOMEM;
break;
}
pcsd->kern_dev->si_drv1 = pcsd;
cuse_server_lock(pcs);
TAILQ_INSERT_TAIL(&pcs->hdev, pcsd, entry);
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_DESTROY_DEV:
error = priv_check(curthread, PRIV_DRIVER);
if (error)
break;
cuse_server_lock(pcs);
error = EINVAL;
pcsd = TAILQ_FIRST(&pcs->hdev);
while (pcsd != NULL) {
if (pcsd->user_dev == *(struct cuse_dev **)data) {
TAILQ_REMOVE(&pcs->hdev, pcsd, entry);
cuse_server_unlock(pcs);
cuse_server_free_dev(pcsd);
cuse_server_lock(pcs);
error = 0;
pcsd = TAILQ_FIRST(&pcs->hdev);
} else {
pcsd = TAILQ_NEXT(pcsd, entry);
}
}
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_WRITE_DATA:
case CUSE_IOCTL_READ_DATA:
cuse_server_lock(pcs);
pchk = (struct cuse_data_chunk *)data;
pccmd = cuse_server_find_command(pcs, curthread);
if (pccmd == NULL) {
error = ENXIO; /* invalid request */
} else if (pchk->peer_ptr < CUSE_BUF_MIN_PTR) {
error = EFAULT; /* NULL pointer */
} else if (pchk->length == 0) {
/* NOP */
} else if (pchk->peer_ptr < CUSE_BUF_MAX_PTR) {
error = cuse_server_ioctl_copy_locked(pcs, pccmd,
pchk, cmd == CUSE_IOCTL_READ_DATA);
} else {
error = cuse_server_data_copy_optimized_locked(
pcs, pccmd, pchk, cmd == CUSE_IOCTL_READ_DATA);
}
/*
* Sometimes the functions above drop the server lock
* early as an optimization:
*/
if (cuse_server_is_locked(pcs))
cuse_server_unlock(pcs);
break;
case CUSE_IOCTL_SELWAKEUP:
cuse_server_lock(pcs);
/*
* We don't know which direction caused the event.
* Wakeup both!
*/
cuse_server_wakeup_all_client_locked(pcs);
cuse_server_unlock(pcs);
break;
default:
error = ENXIO;
break;
}
return (error);
}
static int
cuse_server_poll(struct cdev *dev, int events, struct thread *td)
{
return (events & (POLLHUP | POLLPRI | POLLIN |
POLLRDNORM | POLLOUT | POLLWRNORM));
}
static int
cuse_common_mmap_single(struct cuse_server *pcs,
vm_ooffset_t *offset, vm_size_t size, struct vm_object **object)
{
struct cuse_memory *mem;
int error;
/* verify size */
if ((size % PAGE_SIZE) != 0 || (size < PAGE_SIZE))
return (EINVAL);
cuse_server_lock(pcs);
error = ENOMEM;
/* lookup memory structure, if any */
TAILQ_FOREACH(mem, &pcs->hmem, entry) {
vm_ooffset_t min_off;
vm_ooffset_t max_off;
min_off = (mem->alloc_nr << CUSE_ALLOC_UNIT_SHIFT);
max_off = min_off + (PAGE_SIZE * mem->page_count);
if (*offset >= min_off && *offset < max_off) {
/* range check size */
if (size > (max_off - *offset)) {
error = EINVAL;
} else {
/* get new VM object offset to use */
*offset -= min_off;
vm_object_reference(mem->object);
*object = mem->object;
error = 0;
}
break;
}
}
cuse_server_unlock(pcs);
return (error);
}
static int
cuse_server_mmap_single(struct cdev *dev, vm_ooffset_t *offset,
vm_size_t size, struct vm_object **object, int nprot)
{
struct cuse_server *pcs;
int error;
error = cuse_server_get(&pcs);
if (error != 0)
return (error);
return (cuse_common_mmap_single(pcs, offset, size, object));
}
/*------------------------------------------------------------------------*
* CUSE CLIENT PART
*------------------------------------------------------------------------*/
static void
cuse_client_free(void *arg)
{
struct cuse_client *pcc = arg;
struct cuse_client_command *pccmd;
struct cuse_server *pcs;
int n;
pcs = pcc->server;
cuse_server_lock(pcs);
cuse_client_is_closing(pcc);
TAILQ_REMOVE(&pcs->hcli, pcc, entry);
cuse_server_unlock(pcs);
for (n = 0; n != CUSE_CMD_MAX; n++) {
pccmd = &pcc->cmds[n];
sx_destroy(&pccmd->sx);
cv_destroy(&pccmd->cv);
}
free(pcc, M_CUSE);
/* drop reference on server */
cuse_server_unref(pcs);
}
static int
cuse_client_open(struct cdev *dev, int fflags, int devtype, struct thread *td)
{
struct cuse_client_command *pccmd;
struct cuse_server_dev *pcsd;
struct cuse_client *pcc;
struct cuse_server *pcs;
struct cuse_dev *pcd;
int error;
int n;
pcsd = dev->si_drv1;
if (pcsd != NULL) {
pcs = pcsd->server;
pcd = pcsd->user_dev;
cuse_server_lock(pcs);
/*
* Check that the refcount didn't wrap and that the
* same process is not both client and server. This
* can easily lead to deadlocks when destroying the
* CUSE character device nodes:
*/
pcs->refs++;
if (pcs->refs < 0 || pcs->pid == curproc->p_pid) {
/* overflow or wrong PID */
pcs->refs--;
cuse_server_unlock(pcs);
return (EINVAL);
}
cuse_server_unlock(pcs);
} else {
return (EINVAL);
}
pcc = malloc(sizeof(*pcc), M_CUSE, M_WAITOK | M_ZERO);
if (devfs_set_cdevpriv(pcc, &cuse_client_free)) {
printf("Cuse: Cannot set cdevpriv.\n");
/* drop reference on server */
cuse_server_unref(pcs);
free(pcc, M_CUSE);
return (ENOMEM);
}
pcc->fflags = fflags;
pcc->server_dev = pcsd;
pcc->server = pcs;
for (n = 0; n != CUSE_CMD_MAX; n++) {
pccmd = &pcc->cmds[n];
pccmd->sub.dev = pcd;
pccmd->sub.command = n;
pccmd->client = pcc;
sx_init(&pccmd->sx, "cuse-client-sx");
cv_init(&pccmd->cv, "cuse-client-cv");
}
cuse_server_lock(pcs);
/* cuse_client_free() assumes that the client is listed somewhere! */
/* always enqueue */
TAILQ_INSERT_TAIL(&pcs->hcli, pcc, entry);
/* check if server is closing */
if ((pcs->is_closing != 0) || (dev->si_drv1 == NULL)) {
error = EINVAL;
} else {
error = 0;
}
cuse_server_unlock(pcs);
if (error) {
devfs_clear_cdevpriv(); /* XXX bugfix */
return (error);
}
pccmd = &pcc->cmds[CUSE_CMD_OPEN];
cuse_cmd_lock(pccmd);
cuse_server_lock(pcs);
cuse_client_send_command_locked(pccmd, 0, 0, pcc->fflags, 0);
error = cuse_client_receive_command_locked(pccmd, 0, 0);
cuse_server_unlock(pcs);
if (error < 0) {
error = cuse_convert_error(error);
} else {
error = 0;
}
cuse_cmd_unlock(pccmd);
if (error)
devfs_clear_cdevpriv(); /* XXX bugfix */
return (error);
}
static int
cuse_client_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct cuse_client_command *pccmd;
struct cuse_client *pcc;
struct cuse_server *pcs;
int error;
error = cuse_client_get(&pcc);
if (error != 0)
return (0);
pccmd = &pcc->cmds[CUSE_CMD_CLOSE];
pcs = pcc->server;
cuse_cmd_lock(pccmd);
cuse_server_lock(pcs);
cuse_client_send_command_locked(pccmd, 0, 0, pcc->fflags, 0);
error = cuse_client_receive_command_locked(pccmd, 0, 0);
cuse_cmd_unlock(pccmd);
cuse_client_is_closing(pcc);
cuse_server_unlock(pcs);
return (0);
}
static void
cuse_client_kqfilter_poll(struct cdev *dev, struct cuse_client *pcc)
{
struct cuse_server *pcs = pcc->server;
int temp;
cuse_server_lock(pcs);
temp = (pcc->cflags & (CUSE_CLI_KNOTE_HAS_READ |
CUSE_CLI_KNOTE_HAS_WRITE));
pcc->cflags &= ~(CUSE_CLI_KNOTE_NEED_READ |
CUSE_CLI_KNOTE_NEED_WRITE);
cuse_server_unlock(pcs);
if (temp != 0) {
/* get the latest polling state from the server */
temp = cuse_client_poll(dev, POLLIN | POLLOUT, NULL);
if (temp & (POLLIN | POLLOUT)) {
cuse_server_lock(pcs);
if (temp & POLLIN)
pcc->cflags |= CUSE_CLI_KNOTE_NEED_READ;
if (temp & POLLOUT)
pcc->cflags |= CUSE_CLI_KNOTE_NEED_WRITE;
/* make sure the "knote" gets woken up */
cuse_server_wakeup_locked(pcc->server);
cuse_server_unlock(pcs);
}
}
}
static int
cuse_client_read(struct cdev *dev, struct uio *uio, int ioflag)
{
struct cuse_client_command *pccmd;
struct cuse_client *pcc;
struct cuse_server *pcs;
int error;
int temp;
int len;
error = cuse_client_get(&pcc);
if (error != 0)
return (error);
pccmd = &pcc->cmds[CUSE_CMD_READ];
pcs = pcc->server;
if (uio->uio_segflg != UIO_USERSPACE) {
return (EINVAL);
}
uio->uio_segflg = UIO_NOCOPY;
cuse_cmd_lock(pccmd);
while (uio->uio_resid != 0) {
if (uio->uio_iov->iov_len > CUSE_LENGTH_MAX) {
error = ENOMEM;
break;
}
len = uio->uio_iov->iov_len;
cuse_server_lock(pcs);
if (len <= CUSE_COPY_BUFFER_MAX) {
/* set read buffer region for small reads */
pcc->read_base = (uintptr_t)uio->uio_iov->iov_base;
pcc->read_length = len;
}
cuse_client_send_command_locked(pccmd,
(uintptr_t)uio->uio_iov->iov_base,
(unsigned long)(unsigned int)len, pcc->fflags, ioflag);
error = cuse_client_receive_command_locked(pccmd, 0, 0);
/*
* After finishing reading data, disable the read
* region for the cuse_server_data_copy_optimized_locked()
* function:
*/
pcc->read_base = 0;
pcc->read_length = 0;
cuse_server_unlock(pcs);
/*
* The return value indicates the read length, when
* not negative. Range check it just in case to avoid
* passing invalid length values to uiomove().
*/
if (error > len) {
error = ERANGE;
break;
} else if (error > 0 && len <= CUSE_COPY_BUFFER_MAX) {
temp = copyout(pcc->read_buffer,
uio->uio_iov->iov_base, error);
if (temp != 0) {
error = temp;
break;
}
}
if (error < 0) {
error = cuse_convert_error(error);
break;
} else if (error == len) {
error = uiomove(NULL, error, uio);
if (error)
break;
} else {
error = uiomove(NULL, error, uio);
break;
}
}
cuse_cmd_unlock(pccmd);
uio->uio_segflg = UIO_USERSPACE;/* restore segment flag */
if (error == EWOULDBLOCK)
cuse_client_kqfilter_poll(dev, pcc);
return (error);
}
static int
cuse_client_write(struct cdev *dev, struct uio *uio, int ioflag)
{
struct cuse_client_command *pccmd;
struct cuse_client *pcc;
struct cuse_server *pcs;
int error;
int len;
error = cuse_client_get(&pcc);
if (error != 0)
return (error);
pccmd = &pcc->cmds[CUSE_CMD_WRITE];
pcs = pcc->server;
if (uio->uio_segflg != UIO_USERSPACE) {
return (EINVAL);
}
uio->uio_segflg = UIO_NOCOPY;
cuse_cmd_lock(pccmd);
while (uio->uio_resid != 0) {
if (uio->uio_iov->iov_len > CUSE_LENGTH_MAX) {
error = ENOMEM;
break;
}
len = uio->uio_iov->iov_len;
if (len <= CUSE_COPY_BUFFER_MAX) {
error = copyin(uio->uio_iov->iov_base,
pcc->write_buffer, len);
if (error != 0)
break;
}
cuse_server_lock(pcs);
if (len <= CUSE_COPY_BUFFER_MAX) {
/* set write buffer region for small writes */
pcc->write_base = (uintptr_t)uio->uio_iov->iov_base;
pcc->write_length = len;
}
cuse_client_send_command_locked(pccmd,
(uintptr_t)uio->uio_iov->iov_base,
(unsigned long)(unsigned int)len, pcc->fflags, ioflag);
error = cuse_client_receive_command_locked(pccmd, 0, 0);
/*
* After finishing writing data, disable the write
* region for the cuse_server_data_copy_optimized_locked()
* function:
*/
pcc->write_base = 0;
pcc->write_length = 0;
cuse_server_unlock(pcs);
/*
* The return value indicates the write length, when
* not negative. Range check it just in case to avoid
* passing invalid length values to uiomove().
*/
if (error > len) {
error = ERANGE;
break;
} else if (error < 0) {
error = cuse_convert_error(error);
break;
} else if (error == len) {
error = uiomove(NULL, error, uio);
if (error)
break;
} else {
error = uiomove(NULL, error, uio);
break;
}
}
cuse_cmd_unlock(pccmd);
/* restore segment flag */
uio->uio_segflg = UIO_USERSPACE;
if (error == EWOULDBLOCK)
cuse_client_kqfilter_poll(dev, pcc);
return (error);
}
int
cuse_client_ioctl(struct cdev *dev, unsigned long cmd,
caddr_t data, int fflag, struct thread *td)
{
struct cuse_client_command *pccmd;
struct cuse_client *pcc;
struct cuse_server *pcs;
int error;
int len;
error = cuse_client_get(&pcc);
if (error != 0)
return (error);
len = IOCPARM_LEN(cmd);
if (len > CUSE_BUFFER_MAX)
return (ENOMEM);
pccmd = &pcc->cmds[CUSE_CMD_IOCTL];
pcs = pcc->server;
cuse_cmd_lock(pccmd);
if (cmd & (IOC_IN | IOC_VOID))
memcpy(pcc->ioctl_buffer, data, len);
/*
* When the ioctl-length is zero drivers can pass information
* through the data pointer of the ioctl. Make sure this information
* is forwarded to the driver.
*/
cuse_server_lock(pcs);
cuse_client_send_command_locked(pccmd,
(len == 0) ? *(long *)data : CUSE_BUF_MIN_PTR,
(unsigned long)cmd, pcc->fflags,
(fflag & O_NONBLOCK) ? IO_NDELAY : 0);
error = cuse_client_receive_command_locked(pccmd, data, len);
cuse_server_unlock(pcs);
if (error < 0) {
error = cuse_convert_error(error);
} else {
error = 0;
}
if (cmd & IOC_OUT)
memcpy(data, pcc->ioctl_buffer, len);
cuse_cmd_unlock(pccmd);
if (error == EWOULDBLOCK)
cuse_client_kqfilter_poll(dev, pcc);
return (error);
}
static int
cuse_client_poll(struct cdev *dev, int events, struct thread *td)
{
struct cuse_client_command *pccmd;
struct cuse_client *pcc;
struct cuse_server *pcs;
unsigned long temp;
int error;
int revents;
error = cuse_client_get(&pcc);
if (error != 0)
goto pollnval;
temp = 0;
pcs = pcc->server;
if (events & (POLLPRI | POLLIN | POLLRDNORM))
temp |= CUSE_POLL_READ;
if (events & (POLLOUT | POLLWRNORM))
temp |= CUSE_POLL_WRITE;
if (events & POLLHUP)
temp |= CUSE_POLL_ERROR;
pccmd = &pcc->cmds[CUSE_CMD_POLL];
cuse_cmd_lock(pccmd);
/* Need to selrecord() first to not loose any events. */
if (temp != 0 && td != NULL)
selrecord(td, &pcs->selinfo);
cuse_server_lock(pcs);
cuse_client_send_command_locked(pccmd,
0, temp, pcc->fflags, IO_NDELAY);
error = cuse_client_receive_command_locked(pccmd, 0, 0);
cuse_server_unlock(pcs);
cuse_cmd_unlock(pccmd);
if (error < 0) {
goto pollnval;
} else {
revents = 0;
if (error & CUSE_POLL_READ)
revents |= (events & (POLLPRI | POLLIN | POLLRDNORM));
if (error & CUSE_POLL_WRITE)
revents |= (events & (POLLOUT | POLLWRNORM));
if (error & CUSE_POLL_ERROR)
revents |= (events & POLLHUP);
}
return (revents);
pollnval:
/* XXX many clients don't understand POLLNVAL */
return (events & (POLLHUP | POLLPRI | POLLIN |
POLLRDNORM | POLLOUT | POLLWRNORM));
}
static int
cuse_client_mmap_single(struct cdev *dev, vm_ooffset_t *offset,
vm_size_t size, struct vm_object **object, int nprot)
{
struct cuse_client *pcc;
int error;
error = cuse_client_get(&pcc);
if (error != 0)
return (error);
return (cuse_common_mmap_single(pcc->server, offset, size, object));
}
static void
cuse_client_kqfilter_read_detach(struct knote *kn)
{
struct cuse_client *pcc;
struct cuse_server *pcs;
pcc = kn->kn_hook;
pcs = pcc->server;
cuse_server_lock(pcs);
knlist_remove(&pcs->selinfo.si_note, kn, 1);
cuse_server_unlock(pcs);
}
static void
cuse_client_kqfilter_write_detach(struct knote *kn)
{
struct cuse_client *pcc;
struct cuse_server *pcs;
pcc = kn->kn_hook;
pcs = pcc->server;
cuse_server_lock(pcs);
knlist_remove(&pcs->selinfo.si_note, kn, 1);
cuse_server_unlock(pcs);
}
static int
cuse_client_kqfilter_read_event(struct knote *kn, long hint)
{
struct cuse_client *pcc;
pcc = kn->kn_hook;
mtx_assert(&pcc->server->mtx, MA_OWNED);
return ((pcc->cflags & CUSE_CLI_KNOTE_NEED_READ) ? 1 : 0);
}
static int
cuse_client_kqfilter_write_event(struct knote *kn, long hint)
{
struct cuse_client *pcc;
pcc = kn->kn_hook;
mtx_assert(&pcc->server->mtx, MA_OWNED);
return ((pcc->cflags & CUSE_CLI_KNOTE_NEED_WRITE) ? 1 : 0);
}
static int
cuse_client_kqfilter(struct cdev *dev, struct knote *kn)
{
struct cuse_client *pcc;
struct cuse_server *pcs;
int error;
error = cuse_client_get(&pcc);
if (error != 0)
return (error);
pcs = pcc->server;
cuse_server_lock(pcs);
switch (kn->kn_filter) {
case EVFILT_READ:
pcc->cflags |= CUSE_CLI_KNOTE_HAS_READ;
kn->kn_hook = pcc;
kn->kn_fop = &cuse_client_kqfilter_read_ops;
knlist_add(&pcs->selinfo.si_note, kn, 1);
break;
case EVFILT_WRITE:
pcc->cflags |= CUSE_CLI_KNOTE_HAS_WRITE;
kn->kn_hook = pcc;
kn->kn_fop = &cuse_client_kqfilter_write_ops;
knlist_add(&pcs->selinfo.si_note, kn, 1);
break;
default:
error = EINVAL;
break;
}
cuse_server_unlock(pcs);
if (error == 0)
cuse_client_kqfilter_poll(dev, pcc);
return (error);
}