Re: [Libguestfs] [PATCH nbdkit 7/8] vddk: Implement extents.

This uses a new API VixDiskLib_QueryAllocatedBlocks provided in VDDK >= 6.7. Thanks: Martin Kletzander. --- plugins/vddk/vddk-structs.h | 15 +++- plugins/vddk/vddk.c | 138 ++++++++++++++++++++++++++++++++++++ 2 files changed, 152 insertions(+), 1 deletion(-)

+static int +vddk_extents (void *handle, uint32_t count, uint64_t offset, uint32_t flags, + struct nbdkit_extents *extents) +{ + struct vddk_handle *h = handle; + bool req_one = flags & NBDKIT_FLAG_REQ_ONE; + uint64_t position, end, start_sector; + + position = offset; +

+ + for (i = 0; i < block_list->numBlocks; ++i) { + uint64_t offset, length; + + offset = block_list->blocks[i].offset * VIXDISKLIB_SECTOR_SIZE; + length = block_list->blocks[i].length * VIXDISKLIB_SECTOR_SIZE; + + /* The query returns blocks. We must insert holes between the + * blocks as necessary. + */ + if (position < offset) { + if (nbdkit_add_extent (extents, + offset, length, + NBDKIT_EXTENT_HOLE | NBDKIT_EXTENT_ZERO) == -1) + goto error_in_add; + } + + if (nbdkit_add_extent (extents, + offset, length, 0 /* allocated data */) == -1) { + error_in_add: + DEBUG_CALL ("VixDiskLib_FreeBlockList", "block_list"); + VixDiskLib_FreeBlockList (block_list); + return -1; + } + + position = offset + length;

+ } + DEBUG_CALL ("VixDiskLib_FreeBlockList", "block_list"); + VixDiskLib_FreeBlockList (block_list); + + start_sector += nr_sectors; + + if (req_one) + break;