--- /dev/null
+From e6b783a12f7ff491a1a2147d9fe55b4535aa046e Mon Sep 17 00:00:00 2001
+From: Fam Zheng <famcool@gmail.com>
+Date: Tue, 19 Jul 2011 08:38:22 +0800
+Subject: [PATCH 10/12] VMDK: open/read/write for monolithicFlat image
+
+Parse vmdk decriptor file and open mono flat image.
+Read/write the flat extent.
+
+Signed-off-by: Fam Zheng <famcool@gmail.com>
+Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+Signed-off-by: Kevin Wolf <kwolf@redhat.com>
+---
+ block/vmdk.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
+ 1 file changed, 158 insertions(+), 13 deletions(-)
+
+--- a/block/vmdk.c
++++ b/block/vmdk.c
+@@ -65,6 +65,7 @@ typedef struct VmdkExtent {
+ bool flat;
+ int64_t sectors;
+ int64_t end_sector;
++ int64_t flat_start_offset;
+ int64_t l1_table_offset;
+ int64_t l1_backup_table_offset;
+ uint32_t *l1_table;
+@@ -407,9 +408,10 @@ fail:
+ static int vmdk_parent_open(BlockDriverState *bs)
+ {
+ char *p_name;
+- char desc[DESC_SIZE];
++ char desc[DESC_SIZE + 1];
+ BDRVVmdkState *s = bs->opaque;
+
++ desc[DESC_SIZE] = '\0';
+ if (bdrv_pread(bs->file, s->desc_offset, desc, DESC_SIZE) != DESC_SIZE) {
+ return -1;
+ }
+@@ -584,6 +586,144 @@ static int vmdk_open_vmdk4(BlockDriverSt
+ return ret;
+ }
+
++/* find an option value out of descriptor file */
++static int vmdk_parse_description(const char *desc, const char *opt_name,
++ char *buf, int buf_size)
++{
++ char *opt_pos, *opt_end;
++ const char *end = desc + strlen(desc);
++
++ opt_pos = strstr(desc, opt_name);
++ if (!opt_pos) {
++ return -1;
++ }
++ /* Skip "=\"" following opt_name */
++ opt_pos += strlen(opt_name) + 2;
++ if (opt_pos >= end) {
++ return -1;
++ }
++ opt_end = opt_pos;
++ while (opt_end < end && *opt_end != '"') {
++ opt_end++;
++ }
++ if (opt_end == end || buf_size < opt_end - opt_pos + 1) {
++ return -1;
++ }
++ pstrcpy(buf, opt_end - opt_pos + 1, opt_pos);
++ return 0;
++}
++
++static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
++ const char *desc_file_path)
++{
++ int ret;
++ char access[11];
++ char type[11];
++ char fname[512];
++ const char *p = desc;
++ int64_t sectors = 0;
++ int64_t flat_offset;
++
++ while (*p) {
++ /* parse extent line:
++ * RW [size in sectors] FLAT "file-name.vmdk" OFFSET
++ * or
++ * RW [size in sectors] SPARSE "file-name.vmdk"
++ */
++ flat_offset = -1;
++ ret = sscanf(p, "%10s %" SCNd64 " %10s %511s %" SCNd64,
++ access, §ors, type, fname, &flat_offset);
++ if (ret < 4 || strcmp(access, "RW")) {
++ goto next_line;
++ } else if (!strcmp(type, "FLAT")) {
++ if (ret != 5 || flat_offset < 0) {
++ return -EINVAL;
++ }
++ } else if (ret != 4) {
++ return -EINVAL;
++ }
++
++ /* trim the quotation marks around */
++ if (fname[0] == '"') {
++ memmove(fname, fname + 1, strlen(fname));
++ if (strlen(fname) <= 1 || fname[strlen(fname) - 1] != '"') {
++ return -EINVAL;
++ }
++ fname[strlen(fname) - 1] = '\0';
++ }
++ if (sectors <= 0 ||
++ (strcmp(type, "FLAT") && strcmp(type, "SPARSE")) ||
++ (strcmp(access, "RW"))) {
++ goto next_line;
++ }
++
++ /* save to extents array */
++ if (!strcmp(type, "FLAT")) {
++ /* FLAT extent */
++ char extent_path[PATH_MAX];
++ BlockDriverState *extent_file;
++ VmdkExtent *extent;
++
++ path_combine(extent_path, sizeof(extent_path),
++ desc_file_path, fname);
++ ret = bdrv_file_open(&extent_file, extent_path, bs->open_flags);
++ if (ret) {
++ return ret;
++ }
++ extent = vmdk_add_extent(bs, extent_file, true, sectors,
++ 0, 0, 0, 0, sectors);
++ extent->flat_start_offset = flat_offset;
++ } else {
++ /* SPARSE extent, not supported for now */
++ fprintf(stderr,
++ "VMDK: Not supported extent type \"%s\""".\n", type);
++ return -ENOTSUP;
++ }
++next_line:
++ /* move to next line */
++ while (*p && *p != '\n') {
++ p++;
++ }
++ p++;
++ }
++ return 0;
++}
++
++static int vmdk_open_desc_file(BlockDriverState *bs, int flags)
++{
++ int ret;
++ char buf[2048];
++ char ct[128];
++ BDRVVmdkState *s = bs->opaque;
++
++ ret = bdrv_pread(bs->file, 0, buf, sizeof(buf));
++ if (ret < 0) {
++ return ret;
++ }
++ buf[2047] = '\0';
++ if (vmdk_parse_description(buf, "createType", ct, sizeof(ct))) {
++ return -EINVAL;
++ }
++ if (strcmp(ct, "monolithicFlat")) {
++ fprintf(stderr,
++ "VMDK: Not supported image type \"%s\""".\n", ct);
++ return -ENOTSUP;
++ }
++ s->desc_offset = 0;
++ ret = vmdk_parse_extents(buf, bs, bs->file->filename);
++ if (ret) {
++ return ret;
++ }
++
++ /* try to open parent images, if exist */
++ if (vmdk_parent_open(bs)) {
++ qemu_free(s->extents);
++ return -EINVAL;
++ }
++ s->parent_cid = vmdk_read_cid(bs, 1);
++ return 0;
++}
++
+ static int vmdk_open(BlockDriverState *bs, int flags)
+ {
+ uint32_t magic;
+@@ -598,7 +738,7 @@ static int vmdk_open(BlockDriverState *b
+ } else if (magic == VMDK4_MAGIC) {
+ return vmdk_open_vmdk4(bs, flags);
+ } else {
+- return -EINVAL;
++ return vmdk_open_desc_file(bs, flags);
+ }
+ }
+
+@@ -679,7 +819,7 @@ static int get_cluster_offset(BlockDrive
+ if (m_data)
+ m_data->valid = 0;
+ if (extent->flat) {
+- *cluster_offset = 0;
++ *cluster_offset = extent->flat_start_offset;
+ return 0;
+ }
+
+@@ -832,16 +972,20 @@ static int vmdk_read(BlockDriverState *b
+ /* if not allocated, try to read from parent image, if exist */
+ if (bs->backing_hd) {
+ if (!vmdk_is_cid_valid(bs))
+- return -1;
++ return -EINVAL;
+ ret = bdrv_read(bs->backing_hd, sector_num, buf, n);
+ if (ret < 0)
+- return -1;
++ return ret;
+ } else {
+ memset(buf, 0, 512 * n);
+ }
+ } else {
+- if(bdrv_pread(bs->file, cluster_offset + index_in_cluster * 512, buf, n * 512) != n * 512)
+- return -1;
++ ret = bdrv_pread(extent->file,
++ cluster_offset + index_in_cluster * 512,
++ buf, n * 512);
++ if (ret < 0) {
++ return ret;
++ }
+ }
+ nb_sectors -= n;
+ sector_num += n;
+@@ -865,7 +1009,7 @@ static int vmdk_write(BlockDriverState *
+ "(VMDK) Wrong offset: sector_num=0x%" PRIx64
+ " total_sectors=0x%" PRIx64 "\n",
+ sector_num, bs->total_sectors);
+- return -1;
++ return -EIO;
+ }
+
+ while (nb_sectors > 0) {
+@@ -888,16 +1032,17 @@ static int vmdk_write(BlockDriverState *
+ n = nb_sectors;
+ }
+
+- if (bdrv_pwrite(bs->file,
++ ret = bdrv_pwrite(extent->file,
+ cluster_offset + index_in_cluster * 512,
+- buf, n * 512)
+- != n * 512) {
+- return -1;
++ buf,
++ n * 512);
++ if (ret < 0) {
++ return ret;
+ }
+ if (m_data.valid) {
+ /* update L2 tables */
+ if (vmdk_L2update(extent, &m_data) == -1) {
+- return -1;
++ return -EIO;
+ }
+ }
+ nb_sectors -= n;
projects / openwrt / staging / nbd.git / blobdiff