1*4882a593Smuzhiyun=========================================== 2*4882a593SmuzhiyunIBM's Journaled File System (JFS) for Linux 3*4882a593Smuzhiyun=========================================== 4*4882a593Smuzhiyun 5*4882a593SmuzhiyunJFS Homepage: http://jfs.sourceforge.net/ 6*4882a593Smuzhiyun 7*4882a593SmuzhiyunThe following mount options are supported: 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun(*) == default 10*4882a593Smuzhiyun 11*4882a593Smuzhiyuniocharset=name 12*4882a593Smuzhiyun Character set to use for converting from Unicode to 13*4882a593Smuzhiyun ASCII. The default is to do no conversion. Use 14*4882a593Smuzhiyun iocharset=utf8 for UTF-8 translations. This requires 15*4882a593Smuzhiyun CONFIG_NLS_UTF8 to be set in the kernel .config file. 16*4882a593Smuzhiyun iocharset=none specifies the default behavior explicitly. 17*4882a593Smuzhiyun 18*4882a593Smuzhiyunresize=value 19*4882a593Smuzhiyun Resize the volume to <value> blocks. JFS only supports 20*4882a593Smuzhiyun growing a volume, not shrinking it. This option is only 21*4882a593Smuzhiyun valid during a remount, when the volume is mounted 22*4882a593Smuzhiyun read-write. The resize keyword with no value will grow 23*4882a593Smuzhiyun the volume to the full size of the partition. 24*4882a593Smuzhiyun 25*4882a593Smuzhiyunnointegrity 26*4882a593Smuzhiyun Do not write to the journal. The primary use of this option 27*4882a593Smuzhiyun is to allow for higher performance when restoring a volume 28*4882a593Smuzhiyun from backup media. The integrity of the volume is not 29*4882a593Smuzhiyun guaranteed if the system abnormally abends. 30*4882a593Smuzhiyun 31*4882a593Smuzhiyunintegrity(*) 32*4882a593Smuzhiyun Commit metadata changes to the journal. Use this option to 33*4882a593Smuzhiyun remount a volume where the nointegrity option was 34*4882a593Smuzhiyun previously specified in order to restore normal behavior. 35*4882a593Smuzhiyun 36*4882a593Smuzhiyunerrors=continue 37*4882a593Smuzhiyun Keep going on a filesystem error. 38*4882a593Smuzhiyunerrors=remount-ro(*) 39*4882a593Smuzhiyun Remount the filesystem read-only on an error. 40*4882a593Smuzhiyunerrors=panic 41*4882a593Smuzhiyun Panic and halt the machine if an error occurs. 42*4882a593Smuzhiyun 43*4882a593Smuzhiyunuid=value 44*4882a593Smuzhiyun Override on-disk uid with specified value 45*4882a593Smuzhiyungid=value 46*4882a593Smuzhiyun Override on-disk gid with specified value 47*4882a593Smuzhiyunumask=value 48*4882a593Smuzhiyun Override on-disk umask with specified octal value. For 49*4882a593Smuzhiyun directories, the execute bit will be set if the corresponding 50*4882a593Smuzhiyun read bit is set. 51*4882a593Smuzhiyun 52*4882a593Smuzhiyundiscard=minlen, discard/nodiscard(*) 53*4882a593Smuzhiyun This enables/disables the use of discard/TRIM commands. 54*4882a593Smuzhiyun The discard/TRIM commands are sent to the underlying 55*4882a593Smuzhiyun block device when blocks are freed. This is useful for SSD 56*4882a593Smuzhiyun devices and sparse/thinly-provisioned LUNs. The FITRIM ioctl 57*4882a593Smuzhiyun command is also available together with the nodiscard option. 58*4882a593Smuzhiyun The value of minlen specifies the minimum blockcount, when 59*4882a593Smuzhiyun a TRIM command to the block device is considered useful. 60*4882a593Smuzhiyun When no value is given to the discard option, it defaults to 61*4882a593Smuzhiyun 64 blocks, which means 256KiB in JFS. 62*4882a593Smuzhiyun The minlen value of discard overrides the minlen value given 63*4882a593Smuzhiyun on an FITRIM ioctl(). 64*4882a593Smuzhiyun 65*4882a593SmuzhiyunThe JFS mailing list can be subscribed to by using the link labeled 66*4882a593Smuzhiyun"Mail list Subscribe" at our web page http://jfs.sourceforge.net/ 67