|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|
|
NAME | DESCRIPTION | VERSIONS | CONFIGURATION | SEE ALSO | COLOPHON |
|
|
|
erofs(5) File Formats Manual erofs(5)
erofs - the Enhanced Read-Only File System
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.
erofs images are versioned through the use of feature flags; these
are listed in the -E section of mkfs.erofs(1),
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.
mkfs.erofs(1), fsck.erofs(1), dump.erofs(1)
Documentation/filesystems/erofs.txt in the Linux source.
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 erofs(5)
Pages that refer to this page: filesystems(5), repart.d(5)
|
HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
|