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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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|
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int dotu = 1; |
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int debug_9p_pdu;
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|
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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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|
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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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|
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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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|
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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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|
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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 size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size) |
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{
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return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num,
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offset, size, 0);
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} |
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static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src, |
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size_t size) |
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{
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return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num, |
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offset, size, 1);
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} |
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static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg) |
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{
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size_t pos = 0;
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int i, j;
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struct iovec *src_sg;
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unsigned int num; |
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if (rx) {
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src_sg = pdu->elem.in_sg; |
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num = pdu->elem.in_num; |
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} else {
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src_sg = pdu->elem.out_sg; |
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num = pdu->elem.out_num; |
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} |
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j = 0;
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for (i = 0; i < num; i++) { |
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if (offset <= pos) {
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sg[j].iov_base = src_sg[i].iov_base; |
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sg[j].iov_len = src_sg[i].iov_len; |
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j++; |
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} else if (offset < (src_sg[i].iov_len + pos)) { |
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sg[j].iov_base = src_sg[i].iov_base; |
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sg[j].iov_len = src_sg[i].iov_len; |
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sg[j].iov_base += (offset - pos); |
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sg[j].iov_len -= (offset - pos); |
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j++; |
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} |
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pos += src_sg[i].iov_len; |
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} |
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return j;
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} |
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static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
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{
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size_t old_offset = offset; |
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va_list ap; |
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int i;
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va_start(ap, fmt); |
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for (i = 0; fmt[i]; i++) { |
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switch (fmt[i]) {
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case 'b': { |
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uint8_t *valp = va_arg(ap, uint8_t *); |
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offset += pdu_unpack(valp, pdu, offset, sizeof(*valp));
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break;
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} |
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case 'w': { |
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uint16_t val, *valp; |
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valp = va_arg(ap, uint16_t *); |
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val = le16_to_cpupu(valp); |
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val; |
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break;
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} |
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case 'd': { |
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uint32_t val, *valp; |
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valp = va_arg(ap, uint32_t *); |
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val = le32_to_cpupu(valp); |
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val; |
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break;
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} |
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case 'q': { |
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uint64_t val, *valp; |
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valp = va_arg(ap, uint64_t *); |
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val = le64_to_cpup(valp); |
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offset += pdu_unpack(&val, pdu, offset, sizeof(val));
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*valp = val; |
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break;
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} |
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case 'v': { |
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struct iovec *iov = va_arg(ap, struct iovec *); |
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int *iovcnt = va_arg(ap, int *); |
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*iovcnt = pdu_copy_sg(pdu, offset, 0, iov);
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break;
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} |
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case 's': { |
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V9fsString *str = va_arg(ap, V9fsString *); |
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offset += pdu_unmarshal(pdu, offset, "w", &str->size);
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/* FIXME: sanity check str->size */
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str->data = qemu_malloc(str->size + 1);
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offset += pdu_unpack(str->data, pdu, offset, str->size); |
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str->data[str->size] = 0;
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break;
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} |
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case 'Q': { |
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V9fsQID *qidp = va_arg(ap, V9fsQID *); |
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offset += pdu_unmarshal(pdu, offset, "bdq",
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&qidp->type, &qidp->version, &qidp->path); |
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break;
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} |
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case 'S': { |
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V9fsStat *statp = va_arg(ap, V9fsStat *); |
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offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd",
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&statp->size, &statp->type, &statp->dev, |
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&statp->qid, &statp->mode, &statp->atime, |
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&statp->mtime, &statp->length, |
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&statp->name, &statp->uid, &statp->gid, |
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&statp->muid, &statp->extension, |
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&statp->n_uid, &statp->n_gid, |
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&statp->n_muid); |
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break;
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} |
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default:
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break;
|
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} |
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} |
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va_end(ap); |
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return offset - old_offset;
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} |
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|
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static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) |
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{
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size_t old_offset = offset; |
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va_list ap; |
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int i;
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|
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va_start(ap, fmt); |
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for (i = 0; fmt[i]; i++) { |
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switch (fmt[i]) {
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case 'b': { |
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uint8_t val = va_arg(ap, int);
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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} |
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case 'w': { |
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uint16_t val; |
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cpu_to_le16w(&val, va_arg(ap, int));
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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} |
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case 'd': { |
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uint32_t val; |
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cpu_to_le32w(&val, va_arg(ap, uint32_t)); |
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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} |
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case 'q': { |
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uint64_t val; |
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cpu_to_le64w(&val, va_arg(ap, uint64_t)); |
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offset += pdu_pack(pdu, offset, &val, sizeof(val));
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break;
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} |
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case 'v': { |
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struct iovec *iov = va_arg(ap, struct iovec *); |
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int *iovcnt = va_arg(ap, int *); |
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*iovcnt = pdu_copy_sg(pdu, offset, 1, iov);
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break;
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} |
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case 's': { |
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V9fsString *str = va_arg(ap, V9fsString *); |
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offset += pdu_marshal(pdu, offset, "w", str->size);
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offset += pdu_pack(pdu, offset, str->data, str->size); |
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break;
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} |
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case 'Q': { |
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V9fsQID *qidp = va_arg(ap, V9fsQID *); |
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offset += pdu_marshal(pdu, offset, "bdq",
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qidp->type, qidp->version, qidp->path); |
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break;
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} |
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case 'S': { |
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V9fsStat *statp = va_arg(ap, V9fsStat *); |
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offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd",
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statp->size, statp->type, statp->dev, |
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&statp->qid, statp->mode, statp->atime, |
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statp->mtime, statp->length, &statp->name, |
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&statp->uid, &statp->gid, &statp->muid, |
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&statp->extension, statp->n_uid, |
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statp->n_gid, statp->n_muid); |
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break;
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} |
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default:
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break;
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} |
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} |
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va_end(ap); |
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return offset - old_offset;
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} |
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|
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static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len) |
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{
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int8_t id = pdu->id + 1; /* Response */ |
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|
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if (len < 0) { |
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V9fsString str; |
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int err = -len;
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str.data = strerror(err); |
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str.size = strlen(str.data); |
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len = 7;
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len += pdu_marshal(pdu, len, "s", &str);
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if (dotu) {
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len += pdu_marshal(pdu, len, "d", err);
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} |
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id = P9_RERROR; |
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} |
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/* fill out the header */
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pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); |
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/* keep these in sync */
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pdu->size = len; |
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pdu->id = id; |
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/* push onto queue and notify */
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virtqueue_push(s->vq, &pdu->elem, len); |
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|
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/* FIXME: we should batch these completions */
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virtio_notify(&s->vdev, s->vq); |
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free_pdu(s, pdu); |
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} |
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|
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static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu) |
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{
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/* Note: The following have been added to prevent GCC from complaining
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* They will be removed in the subsequent patches */
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(void)pdu_unmarshal;
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(void) complete_pdu;
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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); |
| 361 |
} |
| 362 |
} |
| 363 |
|
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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); |
| 368 |
} |
| 369 |
} |
| 370 |
|
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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); |
| 375 |
} |
| 376 |
} |
| 377 |
|
| 378 |
static void v9fs_flush(V9fsState *s, V9fsPDU *pdu) |
| 379 |
{
|
| 380 |
v9fs_dummy(s, pdu); |
| 381 |
if (debug_9p_pdu) {
|
| 382 |
pprint_pdu(pdu); |
| 383 |
} |
| 384 |
} |
| 385 |
|
| 386 |
static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) |
| 387 |
{
|
| 388 |
if (debug_9p_pdu) {
|
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pprint_pdu(pdu); |
| 390 |
} |
| 391 |
} |
| 392 |
|
| 393 |
static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) |
| 394 |
{
|
| 395 |
if (debug_9p_pdu) {
|
| 396 |
pprint_pdu(pdu); |
| 397 |
} |
| 398 |
} |
| 399 |
|
| 400 |
typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); |
| 401 |
|
| 402 |
static pdu_handler_t *pdu_handlers[] = {
|
| 403 |
[P9_TVERSION] = v9fs_version, |
| 404 |
[P9_TATTACH] = v9fs_attach, |
| 405 |
[P9_TSTAT] = v9fs_stat, |
| 406 |
[P9_TWALK] = v9fs_walk, |
| 407 |
[P9_TCLUNK] = v9fs_clunk, |
| 408 |
[P9_TOPEN] = v9fs_open, |
| 409 |
[P9_TREAD] = v9fs_read, |
| 410 |
#if 0
|
| 411 |
[P9_TAUTH] = v9fs_auth,
|
| 412 |
#endif
|
| 413 |
[P9_TFLUSH] = v9fs_flush, |
| 414 |
[P9_TCREATE] = v9fs_create, |
| 415 |
[P9_TWRITE] = v9fs_write, |
| 416 |
[P9_TWSTAT] = v9fs_wstat, |
| 417 |
[P9_TREMOVE] = v9fs_remove, |
| 418 |
}; |
| 419 |
|
| 420 |
static void submit_pdu(V9fsState *s, V9fsPDU *pdu) |
| 421 |
{
|
| 422 |
pdu_handler_t *handler; |
| 423 |
|
| 424 |
if (debug_9p_pdu) {
|
| 425 |
pprint_pdu(pdu); |
| 426 |
} |
| 427 |
|
| 428 |
BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); |
| 429 |
|
| 430 |
handler = pdu_handlers[pdu->id]; |
| 431 |
BUG_ON(handler == NULL);
|
| 432 |
|
| 433 |
handler(s, pdu); |
| 434 |
} |
| 435 |
|
| 436 |
static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) |
| 437 |
{
|
| 438 |
V9fsState *s = (V9fsState *)vdev; |
| 439 |
V9fsPDU *pdu; |
| 440 |
ssize_t len; |
| 441 |
|
| 442 |
while ((pdu = alloc_pdu(s)) &&
|
| 443 |
(len = virtqueue_pop(vq, &pdu->elem)) != 0) {
|
| 444 |
uint8_t *ptr; |
| 445 |
|
| 446 |
BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); |
| 447 |
BUG_ON(pdu->elem.out_sg[0].iov_len < 7); |
| 448 |
|
| 449 |
ptr = pdu->elem.out_sg[0].iov_base;
|
| 450 |
|
| 451 |
memcpy(&pdu->size, ptr, 4);
|
| 452 |
pdu->id = ptr[4];
|
| 453 |
memcpy(&pdu->tag, ptr + 5, 2); |
| 454 |
|
| 455 |
submit_pdu(s, pdu); |
| 456 |
} |
| 457 |
|
| 458 |
free_pdu(s, pdu); |
| 459 |
} |
| 460 |
|
| 461 |
static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
|
| 462 |
{
|
| 463 |
features |= 1 << VIRTIO_9P_MOUNT_TAG;
|
| 464 |
return features;
|
| 465 |
} |
| 466 |
|
| 467 |
static V9fsState *to_virtio_9p(VirtIODevice *vdev)
|
| 468 |
{
|
| 469 |
return (V9fsState *)vdev;
|
| 470 |
} |
| 471 |
|
| 472 |
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
| 473 |
{
|
| 474 |
struct virtio_9p_config *cfg;
|
| 475 |
V9fsState *s = to_virtio_9p(vdev); |
| 476 |
|
| 477 |
cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + |
| 478 |
s->tag_len); |
| 479 |
stw_raw(&cfg->tag_len, s->tag_len); |
| 480 |
memcpy(cfg->tag, s->tag, s->tag_len); |
| 481 |
memcpy(config, cfg, s->config_size); |
| 482 |
qemu_free(cfg); |
| 483 |
} |
| 484 |
|
| 485 |
VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) |
| 486 |
{
|
| 487 |
V9fsState *s; |
| 488 |
int i, len;
|
| 489 |
struct stat stat;
|
| 490 |
FsTypeEntry *fse; |
| 491 |
|
| 492 |
|
| 493 |
s = (V9fsState *)virtio_common_init("virtio-9p",
|
| 494 |
VIRTIO_ID_9P, |
| 495 |
sizeof(struct virtio_9p_config)+ |
| 496 |
MAX_TAG_LEN, |
| 497 |
sizeof(V9fsState));
|
| 498 |
|
| 499 |
/* initialize pdu allocator */
|
| 500 |
QLIST_INIT(&s->free_list); |
| 501 |
for (i = 0; i < (MAX_REQ - 1); i++) { |
| 502 |
QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
| 503 |
} |
| 504 |
|
| 505 |
s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); |
| 506 |
|
| 507 |
fse = get_fsdev_fsentry(conf->fsdev_id); |
| 508 |
|
| 509 |
if (!fse) {
|
| 510 |
/* We don't have a fsdev identified by fsdev_id */
|
| 511 |
fprintf(stderr, "Virtio-9p device couldn't find fsdev "
|
| 512 |
"with the id %s\n", conf->fsdev_id);
|
| 513 |
exit(1);
|
| 514 |
} |
| 515 |
|
| 516 |
if (!fse->path || !conf->tag) {
|
| 517 |
/* we haven't specified a mount_tag or the path */
|
| 518 |
fprintf(stderr, "fsdev with id %s needs path "
|
| 519 |
"and Virtio-9p device needs mount_tag arguments\n",
|
| 520 |
conf->fsdev_id); |
| 521 |
exit(1);
|
| 522 |
} |
| 523 |
|
| 524 |
if (lstat(fse->path, &stat)) {
|
| 525 |
fprintf(stderr, "share path %s does not exist\n", fse->path);
|
| 526 |
exit(1);
|
| 527 |
} else if (!S_ISDIR(stat.st_mode)) { |
| 528 |
fprintf(stderr, "share path %s is not a directory \n", fse->path);
|
| 529 |
exit(1);
|
| 530 |
} |
| 531 |
|
| 532 |
s->ctx.fs_root = qemu_strdup(fse->path); |
| 533 |
len = strlen(conf->tag); |
| 534 |
if (len > MAX_TAG_LEN) {
|
| 535 |
len = MAX_TAG_LEN; |
| 536 |
} |
| 537 |
/* s->tag is non-NULL terminated string */
|
| 538 |
s->tag = qemu_malloc(len); |
| 539 |
memcpy(s->tag, conf->tag, len); |
| 540 |
s->tag_len = len; |
| 541 |
s->ctx.uid = -1;
|
| 542 |
|
| 543 |
s->ops = fse->ops; |
| 544 |
s->vdev.get_features = virtio_9p_get_features; |
| 545 |
s->config_size = sizeof(struct virtio_9p_config) + |
| 546 |
s->tag_len; |
| 547 |
s->vdev.get_config = virtio_9p_get_config; |
| 548 |
|
| 549 |
return &s->vdev;
|
| 550 |
} |