hw/9pfs: Move pdu_marshal/unmarshal code to a seperate file

Move p9 marshaling/unmarshaling code to a separate file so that
proxy filesytem driver can use these calls. Also made marshaling
code generic to accept "struct iovec" instead of V9fsPDU.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

1 files changed, 301 insertions, 0 deletions

diff --git a/fsdev/virtio-9p-marshal.c b/fsdev/virtio-9p-marshal.c
new file mode 100644
index 0000000000..38fb99e72e
--- /dev/null
+++ b/fsdev/virtio-9p-marshal.c
@@ -0,0 +1,301 @@
+/*
+ * Virtio 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 <dirent.h>
+#include <sys/time.h>
+#include <utime.h>
+#include <sys/uio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "compiler.h"
+#include "virtio-9p-marshal.h"
+#include "bswap.h"
+
+void v9fs_string_init(V9fsString *str)
+{
+    str->data = NULL;
+    str->size = 0;
+}
+
+void v9fs_string_free(V9fsString *str)
+{
+    g_free(str->data);
+    str->data = NULL;
+    str->size = 0;
+}
+
+void v9fs_string_null(V9fsString *str)
+{
+    v9fs_string_free(str);
+}
+
+void GCC_FMT_ATTR(2, 3)
+v9fs_string_sprintf(V9fsString *str, const char *fmt, ...)
+{
+    va_list ap;
+
+    v9fs_string_free(str);
+
+    va_start(ap, fmt);
+    str->size = g_vasprintf(&str->data, fmt, ap);
+    va_end(ap);
+}
+
+void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs)
+{
+    v9fs_string_free(lhs);
+    v9fs_string_sprintf(lhs, "%s", rhs->data);
+}
+
+
+static size_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;
+
+    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;
+            }
+        }
+    }
+
+    return copied;
+}
+
+static size_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);
+}
+
+size_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);
+}
+
+size_t v9fs_unmarshal(struct iovec *out_sg, int out_num, size_t offset,
+                      int bswap, const char *fmt, ...)
+{
+    int i;
+    va_list ap;
+    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 *);
+            offset += v9fs_unpack(valp, out_sg, out_num, offset, sizeof(*valp));
+            break;
+        }
+        case 'w': {
+            uint16_t val, *valp;
+            valp = va_arg(ap, uint16_t *);
+            offset += 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 *);
+            offset += 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 *);
+            offset += 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 *);
+            offset += v9fs_unmarshal(out_sg, out_num, offset, bswap,
+                            "w", &str->size);
+            /* FIXME: sanity check str->size */
+            str->data = g_malloc(str->size + 1);
+            offset += v9fs_unpack(str->data, out_sg, out_num, offset,
+                            str->size);
+            str->data[str->size] = 0;
+            break;
+        }
+        case 'Q': {
+            V9fsQID *qidp = va_arg(ap, V9fsQID *);
+            offset += v9fs_unmarshal(out_sg, out_num, offset, bswap, "bdq",
+                                     &qidp->type, &qidp->version, &qidp->path);
+            break;
+        }
+        case 'S': {
+            V9fsStat *statp = va_arg(ap, V9fsStat *);
+            offset += v9fs_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 *);
+            offset += v9fs_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;
+        }
+    }
+
+    va_end(ap);
+
+    return offset - old_offset;
+}
+
+size_t v9fs_marshal(struct iovec *in_sg, int in_num, size_t offset,
+                    int bswap, const char *fmt, ...)
+{
+    int i;
+    va_list ap;
+    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);
+            offset += 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);
+            }
+            offset += 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);
+            }
+            offset += 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);
+            }
+            offset += v9fs_pack(in_sg, in_num, offset, &val, sizeof(val));
+            break;
+        }
+        case 's': {
+            V9fsString *str = va_arg(ap, V9fsString *);
+            offset += v9fs_marshal(in_sg, in_num, offset, bswap,
+                            "w", str->size);
+            offset += v9fs_pack(in_sg, in_num, offset, str->data, str->size);
+            break;
+        }
+        case 'Q': {
+            V9fsQID *qidp = va_arg(ap, V9fsQID *);
+            offset += v9fs_marshal(in_sg, in_num, offset, bswap, "bdq",
+                                   qidp->type, qidp->version, qidp->path);
+            break;
+        }
+        case 'S': {
+            V9fsStat *statp = va_arg(ap, V9fsStat *);
+            offset += v9fs_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 *);
+            offset += v9fs_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;
+        }
+    }
+    va_end(ap);
+
+    return offset - old_offset;
+}