Linux Patches Begin Adapting Raid Code to Use Folios

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Linux kernel patches are adapting RAID code to use folios for better performance.
Folios, introduced in Linux 5.16, manage contiguous memory pages more efficiently.
Huawei engineer Li Nan proposed using folios for sync I/O in RAID1 and RAID10.
Previously, RAID used 16 x 4K pages for 64K sync I/O; now consolidated into a single 64K folio.
This is the first step towards full folio support in Linux RAID code.
The patches were tested with mdadm and additional fault injection stress tests.

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