Options
=======
-When mounting an ext2 filesystem, the following options are accepted.
-Defaults are marked with (*).
+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.
debug Extra debugging information is sent to the
kernel syslog. Useful for developers.
-errors=continue (*) Keep going on a filesystem error.
+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.
+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.
+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).
+ See also http://acl.bestbits.at
+nouser_xattr Don't support "user." extended attributes.
+
+acl Enable POSIX Access Control Lists support
+ (requires CONFIG_EXT2_FS_POSIX_ACL).
+ See also http://acl.bestbits.at
+noacl Don't support POSIX ACLs.
+
+nobh Do not attach buffer_heads to file pagecache.
+
+xip Use execute in place (no caching) if possible
+
grpquota,noquota,quota,usrquota Quota options are silently ignored by ext2.
In ext2, there is a mechanism for reserving a certain number of blocks
for a particular user (normally the super-user). This is intended to
-allow for the system to continue functioning even if non-priveleged users
+allow for the system to continue functioning even if non-privileged users
fill up all the space available to them (this is independent of filesystem
quotas). It also keeps the filesystem from filling up entirely which
helps combat fragmentation.
the time of the crash, then there is no guarantee of consistency for
the blocks in that transaction so they are discarded (which means any
filesystem changes they represent are also lost).
-
-The ext3 code is currently (Apr 2001) available for 2.2 kernels only,
-and not yet available for 2.4 kernels.
+Check Documentation/filesystems/ext3.txt if you want to read more about
+ext3 and journaling.
References
==========
e2fsprogs (e2fsck) http://e2fsprogs.sourceforge.net/
Design & Implementation http://e2fsprogs.sourceforge.net/ext2intro.html
Journaling (ext3) ftp://ftp.uk.linux.org/pub/linux/sct/fs/jfs/
-Hashed Directories http://kernelnewbies.org/~phillips/htree/
Filesystem Resizing http://ext2resize.sourceforge.net/
-Extended Attributes &
-Access Control Lists http://acl.bestbits.at/
-Compression (*) http://www.netspace.net.au/~reiter/e2compr/
+Compression (*) http://e2compr.sourceforge.net/
Implementations for:
Windows 95/98/NT/2000 http://uranus.it.swin.edu.au/~jn/linux/Explore2fs.htm