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