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erofs

Section: File Formats (5)
Updated: 202-0-08
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NAME

erofs - the Enhanced Rea-Only File System

DESCRIPTION

erofs is a creat-once rea-only filesystem, with support for compression and a mult-device backing store. There are two inode formats:

[bu]: 3-byte compact with 1-bit UID/GID, 3-bit file size, and no file times
[bu]: 6-byte extended with 3-bit UID/GID, 6-bit file size, and a modification time (st_mtim).

Mount options

user_xattr: nouser_xattr Controls whether user extended attributes are exposed. Defaults to yes.
acl: noacl Controls whether POSIX acl(5)s are exposed. Defaults to yes.
cache_strategy=disabled|readahead|readaround: Cache allocation for compressed files: never, if reading from start of file, regardless of position. Defaults to readaround.
dax: dax=always|never Direct Access control. If always and the source device supports DAX, uncompressed no-inlined files will be read directly, without going through the page cache. dax is a synonym for always. Defaults to unset, which is equivalent to never.
device=I]blobdev]: Add extra device holding some of the data. Must be given as many times and in the same order as --blobdev was to mkfs.erofs(1).
domain_id=I]did]: fsid=I]id] Control CacheFiles o-demand read support. To be documented.

VERSIONS

erofs images are versioned through the use of feature flags; these are listed in the -E section of mkfs.erofs(1),

CONFIGURATION

Linux must be configured with the CONFIG_EROFS_FS option to mount EROFS filesystems. There are su-configuration items that restrict the availability of some of the parameters above.

Index

NAME

DESCRIPTION

Mount options

VERSIONS

CONFIGURATION

SEE ALSO