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-rw-r--r--fsdev/9p-iov-marshal.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/fsdev/9p-iov-marshal.c b/fsdev/9p-iov-marshal.c
new file mode 100644
index 0000000000..4883b60d17
--- /dev/null
+++ b/fsdev/9p-iov-marshal.c
@@ -0,0 +1,301 @@
+/*
+ * 9p backend
+ *
+ * Copyright IBM, Corp. 2010
+ *
+ * Authors:
+ * Anthony Liguori <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include <glib.h>
+#include <glib/gprintf.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <utime.h>
+#include <sys/uio.h>
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include "qemu/compiler.h"
+#include "9p-iov-marshal.h"
+#include "qemu/bswap.h"
+
+static ssize_t v9fs_packunpack(void *addr, struct iovec *sg, int sg_count,
+ size_t offset, size_t size, int pack)
+{
+ int i = 0;
+ size_t copied = 0;
+ size_t req_size = size;
+
+
+ for (i = 0; size && i < sg_count; i++) {
+ size_t len;
+ if (offset >= sg[i].iov_len) {
+ /* skip this sg */
+ offset -= sg[i].iov_len;
+ continue;
+ } else {
+ len = MIN(sg[i].iov_len - offset, size);
+ if (pack) {
+ memcpy(sg[i].iov_base + offset, addr, len);
+ } else {
+ memcpy(addr, sg[i].iov_base + offset, len);
+ }
+ size -= len;
+ copied += len;
+ addr += len;
+ if (size) {
+ offset = 0;
+ continue;
+ }
+ }
+ }
+ if (copied < req_size) {
+ /*
+ * We copied less that requested size. error out
+ */
+ return -ENOBUFS;
+ }
+ return copied;
+}
+
+static ssize_t v9fs_unpack(void *dst, struct iovec *out_sg, int out_num,
+ size_t offset, size_t size)
+{
+ return v9fs_packunpack(dst, out_sg, out_num, offset, size, 0);
+}
+
+ssize_t v9fs_pack(struct iovec *in_sg, int in_num, size_t offset,
+ const void *src, size_t size)
+{
+ return v9fs_packunpack((void *)src, in_sg, in_num, offset, size, 1);
+}
+
+ssize_t v9fs_iov_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
+ int bswap, const char *fmt, ...)
+{
+ int i;
+ va_list ap;
+ ssize_t copied = 0;
+ size_t old_offset = offset;
+
+ va_start(ap, fmt);
+ for (i = 0; fmt[i]; i++) {
+ switch (fmt[i]) {
+ case 'b': {
+ uint8_t *valp = va_arg(ap, uint8_t *);
+ copied = v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
+ break;
+ }
+ case 'w': {
+ uint16_t val, *valp;
+ valp = va_arg(ap, uint16_t *);
+ copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
+ if (bswap) {
+ *valp = le16_to_cpu(val);
+ } else {
+ *valp = val;
+ }
+ break;
+ }
+ case 'd': {
+ uint32_t val, *valp;
+ valp = va_arg(ap, uint32_t *);
+ copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
+ if (bswap) {
+ *valp = le32_to_cpu(val);
+ } else {
+ *valp = val;
+ }
+ break;
+ }
+ case 'q': {
+ uint64_t val, *valp;
+ valp = va_arg(ap, uint64_t *);
+ copied = v9fs_unpack(&val, out_sg, out_num, offset, sizeof(val));
+ if (bswap) {
+ *valp = le64_to_cpu(val);
+ } else {
+ *valp = val;
+ }
+ break;
+ }
+ case 's': {
+ V9fsString *str = va_arg(ap, V9fsString *);
+ copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
+ "w", &str->size);
+ if (copied > 0) {
+ offset += copied;
+ str->data = g_malloc(str->size + 1);
+ copied = v9fs_unpack(str->data, out_sg, out_num, offset,
+ str->size);
+ if (copied > 0) {
+ str->data[str->size] = 0;
+ } else {
+ v9fs_string_free(str);
+ }
+ }
+ break;
+ }
+ case 'Q': {
+ V9fsQID *qidp = va_arg(ap, V9fsQID *);
+ copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
+ "bdq", &qidp->type, &qidp->version,
+ &qidp->path);
+ break;
+ }
+ case 'S': {
+ V9fsStat *statp = va_arg(ap, V9fsStat *);
+ copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
+ "wwdQdddqsssssddd",
+ &statp->size, &statp->type,
+ &statp->dev, &statp->qid,
+ &statp->mode, &statp->atime,
+ &statp->mtime, &statp->length,
+ &statp->name, &statp->uid,
+ &statp->gid, &statp->muid,
+ &statp->extension,
+ &statp->n_uid, &statp->n_gid,
+ &statp->n_muid);
+ break;
+ }
+ case 'I': {
+ V9fsIattr *iattr = va_arg(ap, V9fsIattr *);
+ copied = v9fs_iov_unmarshal(out_sg, out_num, offset, bswap,
+ "ddddqqqqq",
+ &iattr->valid, &iattr->mode,
+ &iattr->uid, &iattr->gid,
+ &iattr->size, &iattr->atime_sec,
+ &iattr->atime_nsec,
+ &iattr->mtime_sec,
+ &iattr->mtime_nsec);
+ break;
+ }
+ default:
+ break;
+ }
+ if (copied < 0) {
+ va_end(ap);
+ return copied;
+ }
+ offset += copied;
+ }
+ va_end(ap);
+
+ return offset - old_offset;
+}
+
+ssize_t v9fs_iov_marshal(struct iovec *in_sg, int in_num, size_t offset,
+ int bswap, const char *fmt, ...)
+{
+ int i;
+ va_list ap;
+ ssize_t copied = 0;
+ size_t old_offset = offset;
+
+ va_start(ap, fmt);
+ for (i = 0; fmt[i]; i++) {
+ switch (fmt[i]) {
+ case 'b': {
+ uint8_t val = va_arg(ap, int);
+ copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
+ break;
+ }
+ case 'w': {
+ uint16_t val;
+ if (bswap) {
+ cpu_to_le16w(&val, va_arg(ap, int));
+ } else {
+ val = va_arg(ap, int);
+ }
+ copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
+ break;
+ }
+ case 'd': {
+ uint32_t val;
+ if (bswap) {
+ cpu_to_le32w(&val, va_arg(ap, uint32_t));
+ } else {
+ val = va_arg(ap, uint32_t);
+ }
+ copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
+ break;
+ }
+ case 'q': {
+ uint64_t val;
+ if (bswap) {
+ cpu_to_le64w(&val, va_arg(ap, uint64_t));
+ } else {
+ val = va_arg(ap, uint64_t);
+ }
+ copied = v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
+ break;
+ }
+ case 's': {
+ V9fsString *str = va_arg(ap, V9fsString *);
+ copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
+ "w", str->size);
+ if (copied > 0) {
+ offset += copied;
+ copied = v9fs_pack(in_sg, in_num, offset, str->data, str->size);
+ }
+ break;
+ }
+ case 'Q': {
+ V9fsQID *qidp = va_arg(ap, V9fsQID *);
+ copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap, "bdq",
+ qidp->type, qidp->version,
+ qidp->path);
+ break;
+ }
+ case 'S': {
+ V9fsStat *statp = va_arg(ap, V9fsStat *);
+ copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
+ "wwdQdddqsssssddd",
+ statp->size, statp->type, statp->dev,
+ &statp->qid, statp->mode, statp->atime,
+ statp->mtime, statp->length,
+ &statp->name,
+ &statp->uid, &statp->gid, &statp->muid,
+ &statp->extension, statp->n_uid,
+ statp->n_gid, statp->n_muid);
+ break;
+ }
+ case 'A': {
+ V9fsStatDotl *statp = va_arg(ap, V9fsStatDotl *);
+ copied = v9fs_iov_marshal(in_sg, in_num, offset, bswap,
+ "qQdddqqqqqqqqqqqqqqq",
+ statp->st_result_mask,
+ &statp->qid, statp->st_mode,
+ statp->st_uid, statp->st_gid,
+ statp->st_nlink, statp->st_rdev,
+ statp->st_size, statp->st_blksize,
+ statp->st_blocks, statp->st_atime_sec,
+ statp->st_atime_nsec,
+ statp->st_mtime_sec,
+ statp->st_mtime_nsec,
+ statp->st_ctime_sec,
+ statp->st_ctime_nsec,
+ statp->st_btime_sec,
+ statp->st_btime_nsec, statp->st_gen,
+ statp->st_data_version);
+ break;
+ }
+ default:
+ break;
+ }
+ if (copied < 0) {
+ va_end(ap);
+ return copied;
+ }
+ offset += copied;
+ }
+ va_end(ap);
+
+ return offset - old_offset;
+}
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