erofs(5)                      File Formats Manual                     erofs(5)

NAME
       erofs - the Enhanced Read-Only File System

DESCRIPTION
       erofs is a create-once read-only filesystem, with support for
       compression and a multi-device backing store.

       There are two inode formats:

       o  32-byte compact with 16-bit UID/GID, 32-bit file size, and no file
          times
       o  64-byte extended with 32-bit UID/GID, 64-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 non-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=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=did
       fsid=id
              Control CacheFiles on-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 sub-configuration items that restrict the
       availability of some of the parameters above.

SEE ALSO
       mkfs.erofs(1), fsck.erofs(1), dump.erofs(1)

       Documentation/filesystems/erofs.txt in the Linux source.

Linux man-pages 6.7               2023-10-31                          erofs(5)