1IBM's Journaled File System (JFS) for Linux
2
3JFS Homepage:  http://jfs.sourceforge.net/
4
5The following mount options are supported:
6(*) == default
7
8iocharset=name	Character set to use for converting from Unicode to
9		ASCII.  The default is to do no conversion.  Use
10		iocharset=utf8 for UTF-8 translations.  This requires
11		CONFIG_NLS_UTF8 to be set in the kernel .config file.
12		iocharset=none specifies the default behavior explicitly.
13
14resize=value	Resize the volume to <value> blocks.  JFS only supports
15		growing a volume, not shrinking it.  This option is only
16		valid during a remount, when the volume is mounted
17		read-write.  The resize keyword with no value will grow
18		the volume to the full size of the partition.
19
20nointegrity	Do not write to the journal.  The primary use of this option
21		is to allow for higher performance when restoring a volume
22		from backup media.  The integrity of the volume is not
23		guaranteed if the system abnormally abends.
24
25integrity(*)	Commit metadata changes to the journal.  Use this option to
26		remount a volume where the nointegrity option was
27		previously specified in order to restore normal behavior.
28
29errors=continue		Keep going on a filesystem error.
30errors=remount-ro(*)	Remount the filesystem read-only on an error.
31errors=panic		Panic and halt the machine if an error occurs.
32
33uid=value	Override on-disk uid with specified value
34gid=value	Override on-disk gid with specified value
35umask=value	Override on-disk umask with specified octal value.  For
36		directories, the execute bit will be set if the corresponding
37		read bit is set.
38
39discard=minlen	This enables/disables the use of discard/TRIM commands.
40discard		The discard/TRIM commands are sent to the underlying
41nodiscard(*)	block device when blocks are freed. This is useful for SSD
42		devices and sparse/thinly-provisioned LUNs.  The FITRIM ioctl
43		command is also available together with the nodiscard option.
44		The value of minlen specifies the minimum blockcount, when
45		a TRIM command to the block device is considered useful.
46		When no value is given to the discard option, it defaults to
47		64 blocks, which means 256KiB in JFS.
48		The minlen value of discard overrides the minlen value given
49		on an FITRIM ioctl().
50
51The JFS mailing list can be subscribed to by using the link labeled
52"Mail list Subscribe" at our web page http://jfs.sourceforge.net/
53