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:

       •  32-byte compact with 16-bit UID/GID, 32-bit file size, and no file times
       •  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.