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