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jfs.txt

jfs.txt 2.3 KB
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  1. IBM's Journaled File System (JFS) for Linux
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  2. 

  3. JFS Homepage:  http://jfs.sourceforge.net/
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  4. 

  5. The following mount options are supported:
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  6. (*) == default
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  7. 

  8. iocharset=name	Character set to use for converting from Unicode to
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  9. 		ASCII.  The default is to do no conversion.  Use
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  10. 		iocharset=utf8 for UTF-8 translations.  This requires
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  11. 		CONFIG_NLS_UTF8 to be set in the kernel .config file.
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  12. 		iocharset=none specifies the default behavior explicitly.
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  13. 

  14. resize=value	Resize the volume to <value> blocks.  JFS only supports
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  15. 		growing a volume, not shrinking it.  This option is only
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  16. 		valid during a remount, when the volume is mounted
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  17. 		read-write.  The resize keyword with no value will grow
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  18. 		the volume to the full size of the partition.
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  19. 

  20. nointegrity	Do not write to the journal.  The primary use of this option
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  21. 		is to allow for higher performance when restoring a volume
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  22. 		from backup media.  The integrity of the volume is not
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  23. 		guaranteed if the system abnormally abends.
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  24. 

  25. integrity(*)	Commit metadata changes to the journal.  Use this option to
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  26. 		remount a volume where the nointegrity option was
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  27. 		previously specified in order to restore normal behavior.
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  28. 

  29. errors=continue		Keep going on a filesystem error.
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  30. errors=remount-ro(*)	Remount the filesystem read-only on an error.
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  31. errors=panic		Panic and halt the machine if an error occurs.
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  32. 

  33. uid=value	Override on-disk uid with specified value
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  34. gid=value	Override on-disk gid with specified value
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  35. umask=value	Override on-disk umask with specified octal value.  For
    36. 

  36. 		directories, the execute bit will be set if the corresponding
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  37. 		read bit is set.
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  38. 

  39. discard=minlen	This enables/disables the use of discard/TRIM commands.
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  40. discard		The discard/TRIM commands are sent to the underlying
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  41. nodiscard(*)	block device when blocks are freed. This is useful for SSD
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  42. 		devices and sparse/thinly-provisioned LUNs.  The FITRIM ioctl
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  43. 		command is also available together with the nodiscard option.
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  44. 		The value of minlen specifies the minimum blockcount, when
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  45. 		a TRIM command to the block device is considered useful.
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  46. 		When no value is given to the discard option, it defaults to
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  47. 		64 blocks, which means 256KiB in JFS.
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  48. 		The minlen value of discard overrides the minlen value given
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  49. 		on an FITRIM ioctl().
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  50. 

  51. The JFS mailing list can be subscribed to by using the link labeled
    52. 

  52. "Mail list Subscribe" at our web page http://jfs.sourceforge.net/
    53.