Gao Xiang 61ba89b579 erofs: add 48-bit block addressing on-disk support
The current 32-bit block addressing limits EROFS to a 16TiB maximum
volume size with 4KiB blocks.  However, several new use cases now
require larger capacity support:
 - Massive datasets for model training in order to boost random
   sampling performance for each epoch;

 - Object storage clients using EROFS direct passthrough.

This extends core on-disk structures to support 48-bit block addressing,
such as inodes, device slots, and inode chunks.

Additionally:
 - Expand superblock root NID to 8-byte `rootnid_8b` to enable full
   out-of-place update incremental builds;

 - Introduce `epoch` field in the superblock as well as add `mtime`
   field to 32-byte compact inodes for basic timestamp support.

Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Acked-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20250310095459.2620647-4-hsiangkao@linux.alibaba.com
2025-03-17 01:23:25 +08:00
2024-09-01 20:43:24 -07:00
2025-02-04 11:27:45 -05:00
2025-03-09 13:45:25 -10:00
2024-03-18 03:36:32 -06:00

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.
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