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/*
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* Virtio 9p backend
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "virtio.h" |
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#include "pc.h" |
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#include "qemu_socket.h" |
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#include "virtio-9p.h" |
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#include "fsdev/qemu-fsdev.h" |
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#include "virtio-9p-debug.h" |
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int dotu = 1; |
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int debug_9p_pdu;
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static V9fsPDU *alloc_pdu(V9fsState *s)
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{ |
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V9fsPDU *pdu = NULL;
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if (!QLIST_EMPTY(&s->free_list)) {
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pdu = QLIST_FIRST(&s->free_list); |
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QLIST_REMOVE(pdu, next); |
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} |
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return pdu;
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} |
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static void free_pdu(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (pdu) {
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QLIST_INSERT_HEAD(&s->free_list, pdu, next); |
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} |
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} |
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size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, |
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size_t offset, size_t size, int pack)
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{ |
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int i = 0; |
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size_t copied = 0;
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for (i = 0; size && i < sg_count; i++) { |
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size_t len; |
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if (offset >= sg[i].iov_len) {
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/* skip this sg */
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offset -= sg[i].iov_len; |
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continue;
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} else {
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len = MIN(sg[i].iov_len - offset, size); |
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if (pack) {
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memcpy(sg[i].iov_base + offset, addr, len); |
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} else {
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memcpy(addr, sg[i].iov_base + offset, len); |
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} |
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size -= len; |
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copied += len; |
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addr += len; |
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if (size) {
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offset = 0;
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continue;
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} |
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} |
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} |
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return copied;
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} |
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static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_attach(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_stat(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_open(V9fsState *s, V9fsPDU *pdu) |
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{ if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_read(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_write(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_create(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_flush(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) |
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{ |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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} |
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typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); |
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static pdu_handler_t *pdu_handlers[] = {
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[P9_TVERSION] = v9fs_version, |
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[P9_TATTACH] = v9fs_attach, |
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[P9_TSTAT] = v9fs_stat, |
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[P9_TWALK] = v9fs_walk, |
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[P9_TCLUNK] = v9fs_clunk, |
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[P9_TOPEN] = v9fs_open, |
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[P9_TREAD] = v9fs_read, |
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#if 0
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[P9_TAUTH] = v9fs_auth,
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#endif
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[P9_TFLUSH] = v9fs_flush, |
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[P9_TCREATE] = v9fs_create, |
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[P9_TWRITE] = v9fs_write, |
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[P9_TWSTAT] = v9fs_wstat, |
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[P9_TREMOVE] = v9fs_remove, |
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}; |
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static void submit_pdu(V9fsState *s, V9fsPDU *pdu) |
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{ |
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pdu_handler_t *handler; |
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if (debug_9p_pdu) {
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pprint_pdu(pdu); |
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} |
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BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); |
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handler = pdu_handlers[pdu->id]; |
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BUG_ON(handler == NULL);
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handler(s, pdu); |
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} |
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static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
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{ |
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V9fsState *s = (V9fsState *)vdev; |
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V9fsPDU *pdu; |
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ssize_t len; |
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while ((pdu = alloc_pdu(s)) &&
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(len = virtqueue_pop(vq, &pdu->elem)) != 0) {
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uint8_t *ptr; |
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BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); |
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BUG_ON(pdu->elem.out_sg[0].iov_len < 7); |
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ptr = pdu->elem.out_sg[0].iov_base;
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memcpy(&pdu->size, ptr, 4);
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pdu->id = ptr[4];
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memcpy(&pdu->tag, ptr + 5, 2); |
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submit_pdu(s, pdu); |
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} |
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free_pdu(s, pdu); |
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} |
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static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
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{ |
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features |= 1 << VIRTIO_9P_MOUNT_TAG;
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return features;
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} |
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static V9fsState *to_virtio_9p(VirtIODevice *vdev)
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{ |
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return (V9fsState *)vdev;
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} |
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static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
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{ |
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struct virtio_9p_config *cfg;
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V9fsState *s = to_virtio_9p(vdev); |
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cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + |
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s->tag_len); |
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stw_raw(&cfg->tag_len, s->tag_len); |
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memcpy(cfg->tag, s->tag, s->tag_len); |
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memcpy(config, cfg, s->config_size); |
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qemu_free(cfg); |
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} |
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VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) |
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{ |
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V9fsState *s; |
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int i, len;
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struct stat stat;
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FsTypeEntry *fse; |
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s = (V9fsState *)virtio_common_init("virtio-9p",
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VIRTIO_ID_9P, |
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sizeof(struct virtio_9p_config)+ |
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MAX_TAG_LEN, |
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sizeof(V9fsState));
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/* initialize pdu allocator */
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QLIST_INIT(&s->free_list); |
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for (i = 0; i < (MAX_REQ - 1); i++) { |
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QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
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} |
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s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); |
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fse = get_fsdev_fsentry(conf->fsdev_id); |
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if (!fse) {
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/* We don't have a fsdev identified by fsdev_id */
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fprintf(stderr, "Virtio-9p device couldn't find fsdev "
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"with the id %s\n", conf->fsdev_id);
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exit(1);
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} |
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if (!fse->path || !conf->tag) {
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/* we haven't specified a mount_tag or the path */
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fprintf(stderr, "fsdev with id %s needs path "
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"and Virtio-9p device needs mount_tag arguments\n",
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conf->fsdev_id); |
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exit(1);
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} |
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if (lstat(fse->path, &stat)) {
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fprintf(stderr, "share path %s does not exist\n", fse->path);
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exit(1);
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} else if (!S_ISDIR(stat.st_mode)) { |
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fprintf(stderr, "share path %s is not a directory \n", fse->path);
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exit(1);
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} |
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s->ctx.fs_root = qemu_strdup(fse->path); |
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len = strlen(conf->tag); |
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if (len > MAX_TAG_LEN) {
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len = MAX_TAG_LEN; |
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} |
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/* s->tag is non-NULL terminated string */
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s->tag = qemu_malloc(len); |
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memcpy(s->tag, conf->tag, len); |
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s->tag_len = len; |
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s->ctx.uid = -1;
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s->ops = fse->ops; |
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s->vdev.get_features = virtio_9p_get_features; |
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s->config_size = sizeof(struct virtio_9p_config) + |
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s->tag_len; |
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s->vdev.get_config = virtio_9p_get_config; |
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return &s->vdev;
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} |