Linux cli command erofs

➡ A Linux man page (short for manual page) is a form of software documentation found on Linux and Unix-like operating systems. This man-page explains the command erofs and provides detailed information about the command erofs, system calls, library functions, and other aspects of the system, including usage, options, and examples of _. You can access this man page by typing man followed by the erofs.

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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.

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