Rob Norris 1bf649cb0a vdev_disk: fix alignment check when buffer has non-zero starting offset ... If a linear buffer spans multiple pages, and the first page has a non-zero starting offset, the checker would not include the offset, and so would think there was an alignment gap at the end of the first page, rather than at the start. That is, for a 16K buffer spread across five pages with an initial 512B offset: [.XXXXXXX][XXXXXXXX][XXXXXXXX][XXXXXXXX][XXXXXXX.] It would be interpreted as: [XXXXXXX.][XXXXXXXX]... And be rejected as misaligned. Since it's already a linear ABD, the "linearising" copy would just reuse the buffer as-is, and the second check would failing, tripping the VERIFY in vdev_disk_io_rw(). This commit fixes all this by including the offset in the check for end-of-page alignment. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #16076		2024-04-11 14:43:27 -07:00
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freebsd	abd: add page iterator	2024-03-25 16:50:35 -07:00
linux	vdev_disk: fix alignment check when buffer has non-zero starting offset	2024-04-11 14:43:27 -07:00