xref: /openbmc/linux/fs/ubifs/Kconfig (revision 56d06fa2)
1config UBIFS_FS
2	tristate "UBIFS file system support"
3	select CRC16
4	select CRC32
5	select CRYPTO if UBIFS_FS_ADVANCED_COMPR
6	select CRYPTO if UBIFS_FS_LZO
7	select CRYPTO if UBIFS_FS_ZLIB
8	select CRYPTO_LZO if UBIFS_FS_LZO
9	select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
10	depends on MTD_UBI
11	help
12	  UBIFS is a file system for flash devices which works on top of UBI.
13
14config UBIFS_FS_ADVANCED_COMPR
15	bool "Advanced compression options"
16	depends on UBIFS_FS
17	help
18	  This option allows to explicitly choose which compressions, if any,
19	  are enabled in UBIFS. Removing compressors means inability to read
20	  existing file systems.
21
22	  If unsure, say 'N'.
23
24config UBIFS_FS_LZO
25	bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
26	depends on UBIFS_FS
27	default y
28	help
29	   LZO compressor is generally faster than zlib but compresses worse.
30	   Say 'Y' if unsure.
31
32config UBIFS_FS_ZLIB
33	bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
34	depends on UBIFS_FS
35	default y
36	help
37	  Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
38
39config UBIFS_ATIME_SUPPORT
40	bool "Access time support" if UBIFS_FS
41	depends on UBIFS_FS
42	default n
43	help
44	  Originally UBIFS did not support atime, because it looked like a bad idea due
45	  increased flash wear. This option adds atime support and it is disabled by default
46	  to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
47	  which means that file-system read operations will cause writes (inode atime
48	  updates). This may affect file-system performance and increase flash device wear,
49	  so be careful. How often atime is updated depends on the selected strategy:
50	  strictatime is the "heavy", relatime is "lighter", etc.
51
52	  If unsure, say 'N'
53