Content-type: text/html; charset=UTF-8
Man page of erofs
erofs
Section: File Formats (5)
Updated: 2024-05-02
Index
Return to Main Contents
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.
Index
- NAME
-
- DESCRIPTION
-
- Mount options
-
- VERSIONS
-
- CONFIGURATION
-
- SEE ALSO
-
This document was created by
man2html,
using the manual pages.
Time: 11:48:46 GMT, September 14, 2026