From 3e096650a64daaac261c289b569362b06995e379 Mon Sep 17 00:00:00 2001 From: Bandan Das Date: Fri, 20 Jul 2018 17:40:19 -0400 Subject: [PATCH] dev-mtp: Add support for > 4GB file transfers To support larger file transfers, rely on a short packet to detect end of the data phase and rewrite d->length to the size received Signed-off-by: Bandan Das Message-id: 20180720214020.22897-5-bsd@redhat.com Signed-off-by: Gerd Hoffmann --- hw/usb/dev-mtp.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c index c8f6eb4e9e..2e3ea58da6 100644 --- a/hw/usb/dev-mtp.c +++ b/hw/usb/dev-mtp.c @@ -147,9 +147,12 @@ struct MTPData { uint32_t trans; uint64_t offset; uint64_t length; - uint32_t alloc; + uint64_t alloc; uint8_t *data; bool first; + /* Used for >4G file sizes */ + bool pending; + uint64_t cached_length; int fd; }; @@ -1626,7 +1629,7 @@ static void usb_mtp_write_data(MTPState *s) MTPObject *parent = usb_mtp_object_lookup(s, s->dataset.parent_handle); char *path = NULL; - int rc = -1; + uint64_t rc; mode_t mask = 0644; assert(d != NULL); @@ -1643,7 +1646,7 @@ static void usb_mtp_write_data(MTPState *s) d->fd = mkdir(path, mask); goto free; } - if (s->dataset.size < d->length) { + if ((s->dataset.size != 0xFFFFFFFF) && (s->dataset.size < d->length)) { usb_mtp_queue_result(s, RES_STORE_FULL, d->trans, 0, 0, 0, 0); goto done; @@ -1754,13 +1757,27 @@ static void usb_mtp_get_data(MTPState *s, mtp_container *container, usb_mtp_realloc(d, total_len); d->length += total_len; d->offset = 0; + d->cached_length = total_len; d->first = false; + d->pending = false; + } + + if (d->pending) { + usb_mtp_realloc(d, d->cached_length); + d->length += d->cached_length; + d->pending = false; } if (d->length - d->offset > data_len) { dlen = data_len; } else { dlen = d->length - d->offset; + /* Check for cached data for large files */ + if ((s->dataset.size == 0xFFFFFFFF) && (dlen < p->iov.size)) { + usb_mtp_realloc(d, p->iov.size - dlen); + d->length += p->iov.size - dlen; + dlen = p->iov.size; + } } switch (d->code) { @@ -1780,12 +1797,18 @@ static void usb_mtp_get_data(MTPState *s, mtp_container *container, case CMD_SEND_OBJECT: usb_packet_copy(p, d->data + d->offset, dlen); d->offset += dlen; - if (d->offset == d->length) { + if ((p->iov.size % 64) || !p->iov.size) { + assert((s->dataset.size == 0xFFFFFFFF) || + (s->dataset.size == d->length)); + usb_mtp_write_data(s); usb_mtp_data_free(s->data_out); s->data_out = NULL; return; } + if (d->offset == d->length) { + d->pending = true; + } break; default: p->status = USB_RET_STALL;