[roll] Roll fuchsia [storage] Support passthrough IO for GPT component Adds fuchsia.hardware.block.Block/OpenSessionWithOffsetMap, which can be used to create a session that delegates re-mapping logical block offsets in FIFO requests to an external component. Initially, both the C++ and Rust block servers will only support a single static mapping. Dynamic mappings with multiple entries is required for FVM, and will be added later if performance requires it. This patch also transparently enables passthrough I/O for the GPT: - Clients connect to a GPT partition via the usual Block/OpenSession. - The GPT partition will forward this request as an Block/OpenSessionWithOffsetMap request to the underlying block device, providing a single static mapping describing the partition's range in the device. - From that point onwards, clients talk directly to the underlying block device, and requests in the session are transparently adjusted to be within the GPT partition's range. Original-Bug: 372555443 Original-Bug: 402515764 Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1205470 Original-Revision: 7f41c574a79d248c279ef82f6c2594b1c254b185 GitOrigin-RevId: bb22a98d77f43d8f30c77d1d5b86d762212c0373 Change-Id: I8a45e56aa1cb46bf09eb74838b89c2ac185397c4
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