| IBM's Journaled File System (JFS) for Linux | |
| JFS Homepage: http://jfs.sourceforge.net/ | |
| The following mount options are supported: | |
| (*) == default | |
| iocharset=name Character set to use for converting from Unicode to | |
| ASCII. The default is to do no conversion. Use | |
| iocharset=utf8 for UTF-8 translations. This requires | |
| CONFIG_NLS_UTF8 to be set in the kernel .config file. | |
| iocharset=none specifies the default behavior explicitly. | |
| resize=value Resize the volume to <value> blocks. JFS only supports | |
| growing a volume, not shrinking it. This option is only | |
| valid during a remount, when the volume is mounted | |
| read-write. The resize keyword with no value will grow | |
| the volume to the full size of the partition. | |
| nointegrity Do not write to the journal. The primary use of this option | |
| is to allow for higher performance when restoring a volume | |
| from backup media. The integrity of the volume is not | |
| guaranteed if the system abnormally abends. | |
| integrity(*) Commit metadata changes to the journal. Use this option to | |
| remount a volume where the nointegrity option was | |
| previously specified in order to restore normal behavior. | |
| 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. | |
| uid=value Override on-disk uid with specified value | |
| gid=value Override on-disk gid with specified value | |
| umask=value Override on-disk umask with specified octal value. For | |
| directories, the execute bit will be set if the corresponding | |
| read bit is set. | |
| discard=minlen This enables/disables the use of discard/TRIM commands. | |
| discard The discard/TRIM commands are sent to the underlying | |
| nodiscard(*) block device when blocks are freed. This is useful for SSD | |
| devices and sparse/thinly-provisioned LUNs. The FITRIM ioctl | |
| command is also available together with the nodiscard option. | |
| The value of minlen specifies the minimum blockcount, when | |
| a TRIM command to the block device is considered useful. | |
| When no value is given to the discard option, it defaults to | |
| 64 blocks, which means 256KiB in JFS. | |
| The minlen value of discard overrides the minlen value given | |
| on an FITRIM ioctl(). | |
| The JFS mailing list can be subscribed to by using the link labeled | |
| "Mail list Subscribe" at our web page http://jfs.sourceforge.net/ |