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linux-user: implement device mapper ioctls 

This patch implements all ioctls currently implemented by device mapper,
enabling us to run dmsetup and kpartx inside of linux-user.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
This commit is contained in:
Alexander Graf 2012-01-31 18:42:06 +01:00 committed by Riku Voipio
parent 84803b87a1
commit 56e904ecb2
4 changed files with 312 additions and 0 deletions
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32
linux-user/ioctls.h
View File

@ -345,3 +345,35 @@
IOCTL(VT_SETMODE, IOC_RW, MK_PTR(MK_STRUCT(STRUCT_vt_mode)))
IOCTL(VT_RELDISP, 0, TYPE_INT)
IOCTL(VT_DISALLOCATE, 0, TYPE_INT)
IOCTL(DM_VERSION, IOC_RW, MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_REMOVE_ALL, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_LIST_DEVICES, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_DEV_CREATE, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_DEV_REMOVE, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_DEV_RENAME, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_DEV_SUSPEND, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_DEV_STATUS, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_DEV_WAIT, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_TABLE_LOAD, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_TABLE_CLEAR, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_TABLE_DEPS, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_TABLE_STATUS, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_LIST_VERSIONS,IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_TARGET_MSG, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))
IOCTL_SPECIAL(DM_DEV_SET_GEOMETRY, IOC_RW, do_ioctl_dm,
MK_PTR(MK_STRUCT(STRUCT_dm_ioctl)))

226
linux-user/syscall.c
View File

@ -95,6 +95,7 @@ int __clone2(int (*fn)(void *), void *child_stack_base,
#endif
#include <linux/fb.h>
#include <linux/vt.h>
#include <linux/dm-ioctl.h>
#include "linux_loop.h"
#include "cpu-uname.h"
@ -3354,6 +3355,231 @@ static abi_long do_ioctl_ifconf(const IOCTLEntry *ie, uint8_t *buf_temp,
return ret;
}
static abi_long do_ioctl_dm(const IOCTLEntry *ie, uint8_t *buf_temp, int fd,
abi_long cmd, abi_long arg)
{
void *argptr;
struct dm_ioctl *host_dm;
abi_long guest_data;
uint32_t guest_data_size;
int target_size;
const argtype *arg_type = ie->arg_type;
abi_long ret;
void *big_buf = NULL;
char *host_data;
arg_type++;
target_size = thunk_type_size(arg_type, 0);
argptr = lock_user(VERIFY_READ, arg, target_size, 1);
if (!argptr) {
ret = -TARGET_EFAULT;
goto out;
}
thunk_convert(buf_temp, argptr, arg_type, THUNK_HOST);
unlock_user(argptr, arg, 0);
/* buf_temp is too small, so fetch things into a bigger buffer */
big_buf = g_malloc0(((struct dm_ioctl*)buf_temp)->data_size * 2);
memcpy(big_buf, buf_temp, target_size);
buf_temp = big_buf;
host_dm = big_buf;
guest_data = arg + host_dm->data_start;
if ((guest_data - arg) < 0) {
ret = -EINVAL;
goto out;
}
guest_data_size = host_dm->data_size - host_dm->data_start;
host_data = (char*)host_dm + host_dm->data_start;
argptr = lock_user(VERIFY_READ, guest_data, guest_data_size, 1);
switch (ie->host_cmd) {
case DM_REMOVE_ALL:
case DM_LIST_DEVICES:
case DM_DEV_CREATE:
case DM_DEV_REMOVE:
case DM_DEV_SUSPEND:
case DM_DEV_STATUS:
case DM_DEV_WAIT:
case DM_TABLE_STATUS:
case DM_TABLE_CLEAR:
case DM_TABLE_DEPS:
case DM_LIST_VERSIONS:
/* no input data */
break;
case DM_DEV_RENAME:
case DM_DEV_SET_GEOMETRY:
/* data contains only strings */
memcpy(host_data, argptr, guest_data_size);
break;
case DM_TARGET_MSG:
memcpy(host_data, argptr, guest_data_size);
*(uint64_t*)host_data = tswap64(*(uint64_t*)argptr);
break;
case DM_TABLE_LOAD:
{
void *gspec = argptr;
void *cur_data = host_data;
const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
int spec_size = thunk_type_size(arg_type, 0);
int i;
for (i = 0; i < host_dm->target_count; i++) {
struct dm_target_spec *spec = cur_data;
uint32_t next;
int slen;
thunk_convert(spec, gspec, arg_type, THUNK_HOST);
slen = strlen((char*)gspec + spec_size) + 1;
next = spec->next;
spec->next = sizeof(*spec) + slen;
strcpy((char*)&spec[1], gspec + spec_size);
gspec += next;
cur_data += spec->next;
}
break;
}
default:
ret = -TARGET_EINVAL;
goto out;
}
unlock_user(argptr, guest_data, 0);
ret = get_errno(ioctl(fd, ie->host_cmd, buf_temp));
if (!is_error(ret)) {
guest_data = arg + host_dm->data_start;
guest_data_size = host_dm->data_size - host_dm->data_start;
argptr = lock_user(VERIFY_WRITE, guest_data, guest_data_size, 0);
switch (ie->host_cmd) {
case DM_REMOVE_ALL:
case DM_DEV_CREATE:
case DM_DEV_REMOVE:
case DM_DEV_RENAME:
case DM_DEV_SUSPEND:
case DM_DEV_STATUS:
case DM_TABLE_LOAD:
case DM_TABLE_CLEAR:
case DM_TARGET_MSG:
case DM_DEV_SET_GEOMETRY:
/* no return data */
break;
case DM_LIST_DEVICES:
{
struct dm_name_list *nl = (void*)host_dm + host_dm->data_start;
uint32_t remaining_data = guest_data_size;
void *cur_data = argptr;
const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_name_list) };
int nl_size = 12; /* can't use thunk_size due to alignment */
while (1) {
uint32_t next = nl->next;
if (next) {
nl->next = nl_size + (strlen(nl->name) + 1);
}
if (remaining_data < nl->next) {
host_dm->flags |= DM_BUFFER_FULL_FLAG;
break;
}
thunk_convert(cur_data, nl, arg_type, THUNK_TARGET);
strcpy(cur_data + nl_size, nl->name);
cur_data += nl->next;
remaining_data -= nl->next;
if (!next) {
break;
}
nl = (void*)nl + next;
}
break;
}
case DM_DEV_WAIT:
case DM_TABLE_STATUS:
{
struct dm_target_spec *spec = (void*)host_dm + host_dm->data_start;
void *cur_data = argptr;
const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
int spec_size = thunk_type_size(arg_type, 0);
int i;
for (i = 0; i < host_dm->target_count; i++) {
uint32_t next = spec->next;
int slen = strlen((char*)&spec[1]) + 1;
spec->next = (cur_data - argptr) + spec_size + slen;
if (guest_data_size < spec->next) {
host_dm->flags |= DM_BUFFER_FULL_FLAG;
break;
}
thunk_convert(cur_data, spec, arg_type, THUNK_TARGET);
strcpy(cur_data + spec_size, (char*)&spec[1]);
cur_data = argptr + spec->next;
spec = (void*)host_dm + host_dm->data_start + next;
}
break;
}
case DM_TABLE_DEPS:
{
void *hdata = (void*)host_dm + host_dm->data_start;
int count = *(uint32_t*)hdata;
uint64_t *hdev = hdata + 8;
uint64_t *gdev = argptr + 8;
int i;
*(uint32_t*)argptr = tswap32(count);
for (i = 0; i < count; i++) {
*gdev = tswap64(*hdev);
gdev++;
hdev++;
}
break;
}
case DM_LIST_VERSIONS:
{
struct dm_target_versions *vers = (void*)host_dm + host_dm->data_start;
uint32_t remaining_data = guest_data_size;
void *cur_data = argptr;
const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_versions) };
int vers_size = thunk_type_size(arg_type, 0);
while (1) {
uint32_t next = vers->next;
if (next) {
vers->next = vers_size + (strlen(vers->name) + 1);
}
if (remaining_data < vers->next) {
host_dm->flags |= DM_BUFFER_FULL_FLAG;
break;
}
thunk_convert(cur_data, vers, arg_type, THUNK_TARGET);
strcpy(cur_data + vers_size, vers->name);
cur_data += vers->next;
remaining_data -= vers->next;
if (!next) {
break;
}
vers = (void*)vers + next;
}
break;
}
default:
ret = -TARGET_EINVAL;
goto out;
}
unlock_user(argptr, guest_data, guest_data_size);
argptr = lock_user(VERIFY_WRITE, arg, target_size, 0);
if (!argptr) {
ret = -TARGET_EFAULT;
goto out;
}
thunk_convert(argptr, buf_temp, arg_type, THUNK_TARGET);
unlock_user(argptr, arg, target_size);
}
out:
if (big_buf) {
free(big_buf);
}
return ret;
}
static IOCTLEntry ioctl_entries[] = {
#define IOCTL(cmd, access, ...) \
{ TARGET_ ## cmd, cmd, #cmd, access, 0, { __VA_ARGS__ } },

18
linux-user/syscall_defs.h
View File

@ -989,6 +989,24 @@ struct target_pollfd {
#define TARGET_VT_RELDISP 0x5605
#define TARGET_VT_DISALLOCATE 0x5608
/* device mapper */
#define TARGET_DM_VERSION TARGET_IOWRU(0xfd, 0x00)
#define TARGET_DM_REMOVE_ALL TARGET_IOWRU(0xfd, 0x01)
#define TARGET_DM_LIST_DEVICES TARGET_IOWRU(0xfd, 0x02)
#define TARGET_DM_DEV_CREATE TARGET_IOWRU(0xfd, 0x03)
#define TARGET_DM_DEV_REMOVE TARGET_IOWRU(0xfd, 0x04)
#define TARGET_DM_DEV_RENAME TARGET_IOWRU(0xfd, 0x05)
#define TARGET_DM_DEV_SUSPEND TARGET_IOWRU(0xfd, 0x06)
#define TARGET_DM_DEV_STATUS TARGET_IOWRU(0xfd, 0x07)
#define TARGET_DM_DEV_WAIT TARGET_IOWRU(0xfd, 0x08)
#define TARGET_DM_TABLE_LOAD TARGET_IOWRU(0xfd, 0x09)
#define TARGET_DM_TABLE_CLEAR TARGET_IOWRU(0xfd, 0x0a)
#define TARGET_DM_TABLE_DEPS TARGET_IOWRU(0xfd, 0x0b)
#define TARGET_DM_TABLE_STATUS TARGET_IOWRU(0xfd, 0x0c)
#define TARGET_DM_LIST_VERSIONS TARGET_IOWRU(0xfd, 0x0d)
#define TARGET_DM_TARGET_MSG TARGET_IOWRU(0xfd, 0x0e)
#define TARGET_DM_DEV_SET_GEOMETRY TARGET_IOWRU(0xfd, 0x0f)
/* from asm/termbits.h */
#define TARGET_NCC 8

36
linux-user/syscall_types.h
View File

@ -186,6 +186,42 @@ STRUCT(vt_mode,
TYPE_SHORT, /* acqsig */
TYPE_SHORT) /* frsig */
STRUCT(dm_ioctl,
MK_ARRAY(TYPE_INT, 3), /* version */
TYPE_INT, /* data_size */
TYPE_INT, /* data_start */
TYPE_INT, /* target_count*/
TYPE_INT, /* open_count */
TYPE_INT, /* flags */
TYPE_INT, /* event_nr */
TYPE_INT, /* padding */
TYPE_ULONGLONG, /* dev */
MK_ARRAY(TYPE_CHAR, 128), /* name */
MK_ARRAY(TYPE_CHAR, 129), /* uuid */
MK_ARRAY(TYPE_CHAR, 7)) /* data */
STRUCT(dm_target_spec,
TYPE_ULONGLONG, /* sector_start */
TYPE_ULONGLONG, /* length */
TYPE_INT, /* status */
TYPE_INT, /* next */
MK_ARRAY(TYPE_CHAR, 16)) /* target_type */
STRUCT(dm_target_deps,
TYPE_INT, /* count */
TYPE_INT) /* padding */
STRUCT(dm_name_list,
TYPE_ULONGLONG, /* dev */
TYPE_INT) /* next */
STRUCT(dm_target_versions,
TYPE_INT, /* next */
MK_ARRAY(TYPE_INT, 3)) /* version*/
STRUCT(dm_target_msg,
TYPE_ULONGLONG) /* sector */
STRUCT(fiemap_extent,
TYPE_ULONGLONG, /* fe_logical */
TYPE_ULONGLONG, /* fe_physical */