{
    "mode": "man",
    "parameter": "erofs",
    "section": "5",
    "url": "https://www.chedong.com/phpMan.php/man/erofs/5/json",
    "generated": "2026-10-08T07:31:12Z",
    "sections": {
        "NAME": {
            "content": "erofs - the Enhanced Read-Only File System\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "erofs  is a create-once read-only filesystem, with support for compression and a multi-device\nbacking store.\n\nThere are two inode formats:\n\n•  32-byte compact with 16-bit UID/GID, 32-bit file size, and no file times\n•  64-byte extended with 32-bit UID/GID, 64-bit file size, and a modification time (stmtim).\n",
            "subsections": [
                {
                    "name": "Mount options",
                    "content": ""
                },
                {
                    "name": "user_xattr",
                    "content": ""
                },
                {
                    "name": "nouser_xattr",
                    "content": "Controls whether user extended attributes are exposed.  Defaults to yes.\n"
                },
                {
                    "name": "acl",
                    "content": "noacl  Controls whether POSIX acl(5)s are exposed.  Defaults to yes.\n\ncachestrategy=disabled|readahead|readaround\nCache allocation for compressed files: never, if reading from start of  file,  regard‐\nless of position.  Defaults to readaround.\n"
                },
                {
                    "name": "dax",
                    "content": "dax=always|never\nDirect  Access  control.   If  always and the source device supports DAX, uncompressed\nnon-inlined files will be read directly, without going through the page cache.  dax is\na synonym for always.  Defaults to unset, which is equivalent to never.\n\ndevice=blobdev\nAdd extra device holding some of the data.  Must be given as many  times  and  in  the\nsame order as --blobdev was to mkfs.erofs(1).\n\ndomainid=did\nfsid=id\nControl CacheFiles on-demand read support.  To be documented.\n"
                }
            ]
        },
        "VERSIONS": {
            "content": "erofs  images are versioned through the use of feature flags; these are listed in the -E sec‐\ntion of mkfs.erofs(1),\n",
            "subsections": []
        },
        "CONFIGURATION": {
            "content": "Linux must be configured with the CONFIGEROFSFS option to mount EROFS  filesystems.   There\nare sub-configuration items that restrict the availability of some of the parameters above.\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "mkfs.erofs(1), fsck.erofs(1), dump.erofs(1)\n\nDocumentation/filesystems/erofs.txt in the Linux source.\n\nLinux man-pages 6.7                          2023-10-31                                     erofs(5)",
            "subsections": []
        }
    },
    "summary": "erofs - the Enhanced Read-Only File System",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "mkfs.erofs",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/mkfs.erofs/1/json"
        },
        {
            "name": "fsck.erofs",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/fsck.erofs/1/json"
        },
        {
            "name": "dump.erofs",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/dump.erofs/1/json"
        }
    ]
}