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ChangeLog: https://e2fsprogs.sourceforge.net/e2fsprogs-release.html#1.46.6 Add patch to make m_offset reliable. Due to some race conditions on the pipeline between FreeBSD's yes a, which emits 8190-long writes on 13-STABLE, and GNU dd (gdd), which it pipes its output into, gdd can sometimes receive short reads occasionally, and because the count= normally is the number of read(2) calls dispatched, this then leads to a shorter reference "file system" that we crcsum, and that causes false negative test results. gdd warns that iflag=fullblock would avoid effects of short reads, but this warning is discarded in the test script. Anyways, patch m_offset to use dd's and gdd's iflag=fullblock, which causes (g)dd to call read(2) again until the block is full for each nominal block, so we definitely read the desired output size 512 kB no matter what shorter blocks might travel through the pipeline. MFH: 2023Q1 |
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