0001 ===========================================
0002 IBM's Journaled File System (JFS) for Linux
0003 ===========================================
0004
0005 JFS Homepage: http://jfs.sourceforge.net/
0006
0007 The following mount options are supported:
0008
0009 (*) == default
0010
0011 iocharset=name
0012 Character set to use for converting from Unicode to
0013 ASCII. The default is to do no conversion. Use
0014 iocharset=utf8 for UTF-8 translations. This requires
0015 CONFIG_NLS_UTF8 to be set in the kernel .config file.
0016 iocharset=none specifies the default behavior explicitly.
0017
0018 resize=value
0019 Resize the volume to <value> blocks. JFS only supports
0020 growing a volume, not shrinking it. This option is only
0021 valid during a remount, when the volume is mounted
0022 read-write. The resize keyword with no value will grow
0023 the volume to the full size of the partition.
0024
0025 nointegrity
0026 Do not write to the journal. The primary use of this option
0027 is to allow for higher performance when restoring a volume
0028 from backup media. The integrity of the volume is not
0029 guaranteed if the system abnormally abends.
0030
0031 integrity(*)
0032 Commit metadata changes to the journal. Use this option to
0033 remount a volume where the nointegrity option was
0034 previously specified in order to restore normal behavior.
0035
0036 errors=continue
0037 Keep going on a filesystem error.
0038 errors=remount-ro(*)
0039 Remount the filesystem read-only on an error.
0040 errors=panic
0041 Panic and halt the machine if an error occurs.
0042
0043 uid=value
0044 Override on-disk uid with specified value
0045 gid=value
0046 Override on-disk gid with specified value
0047 umask=value
0048 Override on-disk umask with specified octal value. For
0049 directories, the execute bit will be set if the corresponding
0050 read bit is set.
0051
0052 discard=minlen, discard/nodiscard(*)
0053 This enables/disables the use of discard/TRIM commands.
0054 The discard/TRIM commands are sent to the underlying
0055 block device when blocks are freed. This is useful for SSD
0056 devices and sparse/thinly-provisioned LUNs. The FITRIM ioctl
0057 command is also available together with the nodiscard option.
0058 The value of minlen specifies the minimum blockcount, when
0059 a TRIM command to the block device is considered useful.
0060 When no value is given to the discard option, it defaults to
0061 64 blocks, which means 256KiB in JFS.
0062 The minlen value of discard overrides the minlen value given
0063 on an FITRIM ioctl().
0064
0065 The JFS mailing list can be subscribed to by using the link labeled
0066 "Mail list Subscribe" at our web page http://jfs.sourceforge.net/
