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