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| -rw-r--r-- | Documentation/filesystems/jfs.txt | 52 |
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diff --git a/Documentation/filesystems/jfs.txt b/Documentation/filesystems/jfs.txt new file mode 100644 index 000000000..41fd75799 --- /dev/null +++ b/Documentation/filesystems/jfs.txt @@ -0,0 +1,52 @@ +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/ |