1 files changed, 97 insertions, 0 deletions
diff --git a/man5/erofs.5 b/man5/erofs.5
new file mode 100644
index 0000000..97edfdc
--- /dev/null
+++ b/man5/erofs.5
@@ -0,0 +1,97 @@
+.\" Copyright (c) 2016 by Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH erofs 5 2023-04-29 "Linux man-pages 6.05.01"
+.SH NAME
+erofs \- the Enhanced Read-Only File System
+.SH DESCRIPTION
+.B erofs
+is a create-once read-only filesystem,
+with support for compression and a multi-device backing store.
+.PP
+There are two inode formats:
+.IP \[bu] 3
+32-byte compact with 16-bit UID/GID,
+32-bit file size,
+and no file times
+.PD 0
+.IP \[bu]
+64-byte extended with 32-bit UID/GID,
+64-bit file size,
+and a modification time
+.RI ( st_mtim ).
+.PD
+.\" See fs/erofs/super.c:shmem_parse_options for options it supports.
+.SS Mount options
+.TP
+.B user_xattr
+.TQ
+.B nouser_xattr
+Controls whether
+.I user
+extended attributes are exposed.
+Defaults to yes.
+.TP
+.B acl
+.TQ
+.B noacl
+Controls whether POSIX
+.BR acl (5)s
+are exposed.
+Defaults to yes.
+.TP
+.BR cache_strategy = disabled | readahead | readaround
+Cache allocation for compressed files:
+never, if reading from start of file, regardless of position.
+Defaults to
+.BR readaround .
+.TP
+.B dax
+.TQ
+.BR dax = always | never
+Direct Access control.
+If
+.B always
+and the source device supports DAX, uncompressed non-inlined files
+will be read directly, without going through the page cache.
+.B dax
+is a synonym for
+.BR always .
+Defaults to unset, which is equivalent to
+.BR never .
+.TP
+.BR device = \fIblobdev\fP
+Add extra device holding some of the data.
+Must be given as many times and in the same order as
+.B \-\-blobdev
+was to
+.BR mkfs.erofs (1).
+.\" Nominally there's a device_table feature and it somehow scans(?) for them,
+.\" cf. super.c:erofs_scan_devices(), but I haven't gotten it to work
+.TP
+.BR domain_id = \fIdid\fP
+.TQ
+.BR fsid = \fIid\fP
+Control CacheFiles on-demand read support.
+To be documented.
+.SH VERSIONS
+.B erofs
+images are versioned through the use of feature flags;
+these are listed in the
+.B \-E
+section of
+.BR mkfs.erofs (1),
+.SH CONFIGURATION
+Linux must be configured with the
+.B CONFIG_EROFS_FS
+option to mount EROFS filesystems.
+There are sub-configuration items that restrict the availability
+of some of the parameters above.
+.SH SEE ALSO
+.BR mkfs.erofs (1),
+.BR fsck.erofs (1),
+.BR dump.erofs (1)
+.PP
+.I Documentation/filesystems/erofs.txt
+in the Linux source.