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erofs: add missing documentation about directio mount option

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Document the `directio` mount option for file-backed mounts, because
recent users need this and this mount option has been available since
commit 6422cde1b0 ("erofs: use buffered I/O for file-backed mounts
by default") without proper documentation.

Reported-by: Yuxuan Liu <cdjddzy@foxmail.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2026-01-22 10:52:52 +08:00
parent cc831ab336
commit a221a73740
1 changed files with 2 additions and 0 deletions
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Documentation/filesystems/erofs.rst
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@ -125,6 +125,8 @@ dax={always,never} Use direct access (no page cache). See
Documentation/filesystems/dax.rst.
dax A legacy option which is an alias for ``dax=always``.
device=%s Specify a path to an extra device to be used together.
directio (For file-backed mounts) Use direct I/O to access backing
files, and asynchronous I/O will be enabled if supported.
fsid=%s Specify a filesystem image ID for Fscache back-end.
domain_id=%s Specify a domain ID in fscache mode so that different images
with the same blobs under a given domain ID can share storage.