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vmm: memory_manager: Add SEEK_DATA-based extent iterator

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Adds next_data_extent: a streaming helper that returns the next
populated extent within a window of a file descriptor using
lseek(SEEK_DATA) / lseek(SEEK_HOLE). Used by subsequent commits to walk
the snapshot file extent-by-extent without collecting the full extent
list.

Returns an error on fds or filesystems without SEEK_HOLE support so the
caller can fall back to a dense write path.

Assisted-by: Claude:Opus-4.7
Signed-off-by: Rob Bradford <rbradford@meta.com>
This commit is contained in:
Rob Bradford
2026-04-29 19:26:27 +01:00
parent 739ea8c9fc
commit bf3279f094
3 changed files with 126 additions and 1 deletions
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@@ -2557,6 +2557,7 @@ dependencies = [
"serde_json",
"serial_buffer",
"signal-hook",
"tempfile",
"thiserror",
"tracer",
"uuid",