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btrfs-progs: docs: add subpage feature page 

Introductory paragraph, status and progress needs to be added.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2022-05-13 18:54:14 +02:00
parent 65f67f5829
commit 1c70e888da
2 changed files with 12 additions and 0 deletions
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Documentation/Subpage.rst Normal file
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Subpage support
===============
Subpage block size support, or just *subpage* for short, is a feature to allow
using a filesystem that has different size of data block size (*sectorsize*)
and the host CPU page size. For easier implementation the support was limited
to the exactly same size of the block and page. On x86_64 this is typically
4KiB, but there are other architectures commonly used that make use of larger
pages, like 64KiB on 64bit ARM or PowerPC. A filesystem created on one cannot
be mounted on the other. The subpage support is still work in progress in 5.18
but the support is incrementally added with each release.

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Documentation/index.rst
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@ -35,6 +35,7 @@ Welcome to BTRFS documentation!
Scrub
Seeding-device
Send-receive
Subpage
Subvolumes
Swapfile
Tree-checker