Daniel Verkamp eaaf3e17e6 qcow: buffer reads and writes in QcowRawFile ... When reading and writing refcount blocks and pointer tables, the QcowRawFile implementation was performing many individual read() and write() system calls (one per table entry), which is quite inefficient. Use the read_*_into functions from ReadBytesExt for reads and BufWriter for writes to buffer the I/O into larger chunks. BUG=None TEST=Manually verify larger reads/writes with strace Change-Id: I276963db0a4e91b22335c26c799ae8fb55bf6ad3 Signed-off-by: Daniel Verkamp <dverkamp@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1247441 Reviewed-by: Dylan Reid <dgreid@chromium.org>		2018-09-27 19:44:08 -07:00
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src	qcow: buffer reads and writes in QcowRawFile	2018-09-27 19:44:08 -07:00
Cargo.toml	qcow: implement WriteZeroes for QcowFile	2018-09-05 01:25:50 -07:00