Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / filesystems / jfs.txt

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+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/