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Workaround issue of Linux vdev_disk.c #16678

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Oct 23, 2024
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Workaround issue of Linux vdev_disk.c #16678

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14 changes: 14 additions & 0 deletions module/zfs/zio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -187,6 +187,20 @@ zio_init(void)
continue;
#endif

#if defined(__linux__) && defined(_KERNEL)
/*
* Workaround issue of Linux vdev_disk.c, in some cases not
* linearizing buffers with disk sector crossing a page
* boundary. It is fine for hardware, but somehow required by
* LUKS. It is not typical for ZFS to produce such buffers, but
* it may happen if 6KB block is compressed to 4KB, while still
* having 2KB alignment. Banning the 6KB buffers helps vdevs
* with ashifh=12.
*/
if (size > PAGESIZE && !IS_P2ALIGNED(size, PAGESIZE))
continue;
#endif

if (IS_P2ALIGNED(size, PAGESIZE))
align = PAGESIZE;
else
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