Anatol Belski c569a4cbd4 block: qcow: Return zeros for reads beyond backing file size ...

When an overlay QCOW2 image is larger than its backing file, reads
from offsets beyond the backing file virtual size would previously
fail with an I/O error.

The backing file virtual size is determined at open time and stored
for bounds checking during read operations:

- If the entire read is beyond the backing size, return all zeros
- If the read spans the boundary, read available data from backing and
  fill the remainder with zeros

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>

2026-02-10 08:39:57 +00:00

..

src

block: qcow: Return zeros for reads beyond backing file size

2026-02-10 08:39:57 +00:00

Cargo.toml

block: qcow: Validate incompatible feature bits

2026-01-23 18:58:56 +00:00