| Shobhit Kukreti | ac841c4 | 2019-07-10 08:29:01 -0700 | [diff] [blame^] | 1 | =========================================== |
| 2 | IBM's Journaled File System (JFS) for Linux |
| 3 | =========================================== |
| 4 | |
| 5 | JFS Homepage: http://jfs.sourceforge.net/ |
| 6 | |
| 7 | The following mount options are supported: |
| 8 | |
| 9 | (*) == default |
| 10 | |
| 11 | iocharset=name |
| 12 | Character set to use for converting from Unicode to |
| 13 | ASCII. The default is to do no conversion. Use |
| 14 | iocharset=utf8 for UTF-8 translations. This requires |
| 15 | CONFIG_NLS_UTF8 to be set in the kernel .config file. |
| 16 | iocharset=none specifies the default behavior explicitly. |
| 17 | |
| 18 | resize=value |
| 19 | Resize the volume to <value> blocks. JFS only supports |
| 20 | growing a volume, not shrinking it. This option is only |
| 21 | valid during a remount, when the volume is mounted |
| 22 | read-write. The resize keyword with no value will grow |
| 23 | the volume to the full size of the partition. |
| 24 | |
| 25 | nointegrity |
| 26 | Do not write to the journal. The primary use of this option |
| 27 | is to allow for higher performance when restoring a volume |
| 28 | from backup media. The integrity of the volume is not |
| 29 | guaranteed if the system abnormally abends. |
| 30 | |
| 31 | integrity(*) |
| 32 | Commit metadata changes to the journal. Use this option to |
| 33 | remount a volume where the nointegrity option was |
| 34 | previously specified in order to restore normal behavior. |
| 35 | |
| 36 | errors=continue |
| 37 | Keep going on a filesystem error. |
| 38 | errors=remount-ro(*) |
| 39 | Remount the filesystem read-only on an error. |
| 40 | errors=panic |
| 41 | Panic and halt the machine if an error occurs. |
| 42 | |
| 43 | uid=value |
| 44 | Override on-disk uid with specified value |
| 45 | gid=value |
| 46 | Override on-disk gid with specified value |
| 47 | umask=value |
| 48 | Override on-disk umask with specified octal value. For |
| 49 | directories, the execute bit will be set if the corresponding |
| 50 | read bit is set. |
| 51 | |
| 52 | discard=minlen, discard/nodiscard(*) |
| 53 | This enables/disables the use of discard/TRIM commands. |
| 54 | The discard/TRIM commands are sent to the underlying |
| 55 | block device when blocks are freed. This is useful for SSD |
| 56 | devices and sparse/thinly-provisioned LUNs. The FITRIM ioctl |
| 57 | command is also available together with the nodiscard option. |
| 58 | The value of minlen specifies the minimum blockcount, when |
| 59 | a TRIM command to the block device is considered useful. |
| 60 | When no value is given to the discard option, it defaults to |
| 61 | 64 blocks, which means 256KiB in JFS. |
| 62 | The minlen value of discard overrides the minlen value given |
| 63 | on an FITRIM ioctl(). |
| 64 | |
| 65 | The JFS mailing list can be subscribed to by using the link labeled |
| 66 | "Mail list Subscribe" at our web page http://jfs.sourceforge.net/ |