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usb-mtp: Introduce write support for MTP objects

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Allow write operations on behalf of the initiator. The
precursor to write is the sending of the write metadata
that consists of the ObjectInfo dataset. This patch introduces
a flag that is set when the responder is ready to receive
write data based on a previous SendObjectInfo operation by
the initiator (The SendObjectInfo implementation is in a
later patch)

Signed-off-by: Bandan Das <bsd@redhat.com>
Message-id: 20180223164829.29683-5-bsd@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Bandan Das 2018-02-23 11:48:28 -05:00 committed by Gerd Hoffmann
parent ec6206a68f
commit 88d5f381ec
1 changed files with 155 additions and 2 deletions
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157
hw/usb/dev-mtp.c
View File

@ -47,6 +47,7 @@ enum mtp_code {
CMD_GET_OBJECT_INFO = 0x1008,
CMD_GET_OBJECT = 0x1009,
CMD_DELETE_OBJECT = 0x100b,
CMD_SEND_OBJECT = 0x100d,
CMD_GET_PARTIAL_OBJECT = 0x101b,
CMD_GET_OBJECT_PROPS_SUPPORTED = 0x9801,
CMD_GET_OBJECT_PROP_DESC = 0x9802,
@ -63,9 +64,11 @@ enum mtp_code {
RES_INVALID_STORAGE_ID = 0x2008,
RES_INVALID_OBJECT_HANDLE = 0x2009,
RES_INVALID_OBJECT_FORMAT_CODE = 0x200b,
RES_STORE_FULL = 0x200c,
RES_STORE_READ_ONLY = 0x200e,
RES_PARTIAL_DELETE = 0x2012,
RES_SPEC_BY_FORMAT_UNSUPPORTED = 0x2014,
RES_INVALID_OBJECTINFO = 0x2015,
RES_INVALID_PARENT_OBJECT = 0x201a,
RES_INVALID_PARAMETER = 0x201d,
RES_SESSION_ALREADY_OPEN = 0x201e,
@ -183,6 +186,14 @@ struct MTPState {
int inotifyfd;
QTAILQ_HEAD(events, MTPMonEntry) events;
#endif
/* Responder is expecting a write operation */
bool write_pending;
struct {
uint32_t parent_handle;
uint16_t format;
uint32_t size;
char *filename;
} dataset;
};
#define TYPE_USB_MTP "usb-mtp"
@ -804,6 +815,7 @@ static MTPData *usb_mtp_get_device_info(MTPState *s, MTPControl *c)
CMD_GET_OBJECT_HANDLES,
CMD_GET_OBJECT_INFO,
CMD_DELETE_OBJECT,
CMD_SEND_OBJECT,
CMD_GET_OBJECT,
CMD_GET_PARTIAL_OBJECT,
CMD_GET_OBJECT_PROPS_SUPPORTED,
@ -1378,6 +1390,19 @@ static void usb_mtp_command(MTPState *s, MTPControl *c)
nres = 1;
res0 = data_in->length;
break;
case CMD_SEND_OBJECT:
if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
c->trans, 0, 0, 0, 0);
return;
}
if (!s->write_pending) {
usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO,
c->trans, 0, 0, 0, 0);
return;
}
s->data_out = usb_mtp_data_alloc(c);
return;
case CMD_GET_OBJECT_PROPS_SUPPORTED:
if (c->argv[0] != FMT_UNDEFINED_OBJECT &&
c->argv[0] != FMT_ASSOCIATION) {
@ -1472,12 +1497,126 @@ static void usb_mtp_cancel_packet(USBDevice *dev, USBPacket *p)
fprintf(stderr, "%s\n", __func__);
}
static void usb_mtp_write_data(MTPState *s)
{
MTPData *d = s->data_out;
MTPObject *parent =
usb_mtp_object_lookup(s, s->dataset.parent_handle);
char *path = NULL;
int rc = -1;
mode_t mask = 0644;
assert(d != NULL);
if (parent == NULL || !s->write_pending) {
usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, d->trans,
0, 0, 0, 0);
return;
}
if (s->dataset.filename) {
path = g_strdup_printf("%s/%s", parent->path, s->dataset.filename);
if (s->dataset.format == FMT_ASSOCIATION) {
d->fd = mkdir(path, mask);
goto free;
}
if (s->dataset.size < d->length) {
usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
0, 0, 0, 0);
goto done;
}
d->fd = open(path, O_CREAT | O_WRONLY, mask);
if (d->fd == -1) {
usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
0, 0, 0, 0);
goto done;
}
/*
* Return success if initiator sent 0 sized data
*/
if (!s->dataset.size) {
goto success;
}
rc = write(d->fd, d->data, s->dataset.size);
if (rc == -1) {
usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
0, 0, 0, 0);
goto done;
}
if (rc != s->dataset.size) {
usb_mtp_queue_result(s, RES_INCOMPLETE_TRANSFER, d->trans,
0, 0, 0, 0);
goto done;
}
}
success:
usb_mtp_queue_result(s, RES_OK, d->trans,
0, 0, 0, 0);
done:
/*
* The write dataset is kept around and freed only
* on success or if another write request comes in
*/
if (d->fd != -1) {
close(d->fd);
}
free:
g_free(s->dataset.filename);
g_free(path);
s->write_pending = false;
}
static void usb_mtp_get_data(MTPState *s, mtp_container *container,
USBPacket *p)
{
MTPData *d = s->data_out;
uint64_t dlen;
uint32_t data_len = p->iov.size;
if (d->first) {
/* Total length of incoming data */
d->length = cpu_to_le32(container->length) - sizeof(mtp_container);
/* Length of data in this packet */
data_len -= sizeof(mtp_container);
usb_mtp_realloc(d, d->length);
d->offset = 0;
d->first = false;
}
if (d->length - d->offset > data_len) {
dlen = data_len;
} else {
dlen = d->length - d->offset;
}
switch (d->code) {
case CMD_SEND_OBJECT:
usb_packet_copy(p, d->data + d->offset, dlen);
d->offset += dlen;
if (d->offset == d->length) {
usb_mtp_write_data(s);
usb_mtp_data_free(s->data_out);
s->data_out = NULL;
return;
}
break;
default:
p->status = USB_RET_STALL;
return;
}
}
static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
{
MTPState *s = USB_MTP(dev);
MTPControl cmd;
mtp_container container;
uint32_t params[5];
uint16_t container_type;
int i, rc;
switch (p->ep->nr) {
@ -1567,8 +1706,13 @@ static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
p->status = USB_RET_STALL;
return;
}
usb_packet_copy(p, &container, sizeof(container));
switch (le16_to_cpu(container.type)) {
if (s->data_out && !s->data_out->first) {
container_type = TYPE_DATA;
} else {
usb_packet_copy(p, &container, sizeof(container));
container_type = le16_to_cpu(container.type);
}
switch (container_type) {
case TYPE_COMMAND:
if (s->data_in || s->data_out || s->result) {
trace_usb_mtp_stall(s->dev.addr, "transaction inflight");
@ -1599,6 +1743,15 @@ static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
(cmd.argc > 4) ? cmd.argv[4] : 0);
usb_mtp_command(s, &cmd);
break;
case TYPE_DATA:
/* One of the previous transfers has already errored but the
* responder is still sending data associated with it
*/
if (s->result != NULL) {
return;
}
usb_mtp_get_data(s, &container, p);
break;
default:
/* not needed as long as the mtp device is read-only */
p->status = USB_RET_STALL;