linux-imx

​

The Second Extended Filesystem

==============================

​

ext2 was originally released in January 1993.  Written by R\'emy Card,

Theodore Ts'o and Stephen Tweedie, it was a major rewrite of the

Extended Filesystem.  It is currently still (April 2001) the predominant

filesystem in use by Linux.  There are also implementations available

for NetBSD, FreeBSD, the GNU HURD, Windows 95/98/NT, OS/2 and RISC OS.

​

Options

=======

​

Most defaults are determined by the filesystem superblock, and can be

set using tune2fs(8). Kernel-determined defaults are indicated by (*).

​

bsddf           (*) Makes `df' act like BSD.

minixdf             Makes `df' act like Minix.

​

check=none, nocheck (*) Don't do extra checking of bitmaps on mount

                (check=normal and check=strict options removed)

​

dax             Use direct access (no page cache).  See

                Documentation/filesystems/dax.txt.

​

debug               Extra debugging information is sent to the

                kernel syslog.  Useful for developers.

​

errors=continue         Keep going on a filesystem error.

errors=remount-ro       Remount the filesystem read-only on an error.

errors=panic            Panic and halt the machine if an error occurs.

​

grpid, bsdgroups        Give objects the same group ID as their parent.

nogrpid, sysvgroups     New objects have the group ID of their creator.

​

nouid32             Use 16-bit UIDs and GIDs.

​

oldalloc            Enable the old block allocator. Orlov should

                have better performance, we'd like to get some

                feedback if it's the contrary for you.

orlov           (*) Use the Orlov block allocator.

                (See http://lwn.net/Articles/14633/ and

                http://lwn.net/Articles/14446/.)

​

resuid=n            The user ID which may use the reserved blocks.

resgid=n            The group ID which may use the reserved blocks.

​

sb=n                Use alternate superblock at this location.

​

user_xattr          Enable "user." POSIX Extended Attributes

                (requires CONFIG_EXT2_FS_XATTR).

nouser_xattr            Don't support "user." extended attributes.

​

acl             Enable POSIX Access Control Lists support

                (requires CONFIG_EXT2_FS_POSIX_ACL).

noacl               Don't support POSIX ACLs.

​

nobh                Do not attach buffer_heads to file pagecache.

​

grpquota,noquota,quota,usrquota Quota options are silently ignored by ext2.

​

​

Specification