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queryAlignment() threw when statx came back without STATX_DIOALIGN, so storage could not open a file on a pre-6.1 kernel or a filesystem that does not implement the query (BTRFS, among others). It now falls back to stx_blksize, or the page size when the kernel did not report that either, and warns. The page size is a multiple of every sector size such a filesystem uses, so a buffer aligned to it satisfies any of them. Moving the statx struct and the resolution into linux_statx.h lets linux_alignment_check drive the mask directly, since a modern kernel cannot produce the one this fix is about. Writing that check turned up a division by zero: a filesystem that reports the query but zeroes dio_offset_align (tmpfs) had stx_blksize % stx_dio_offset_align evaluated with a zero divisor whenever stx_blksize was larger. The zero case is now passed through for the caller to reject, as before.
fix(storage): fall back when the kernel does not report STATX_DIOALIGN
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Closes issue #7