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linux/fs/ubifs/Kconfig
Dongsheng Yang 8c1c5f2638 ubifs: introduce UBIFS_ATIME_SUPPORT to ubifs
To make ubifs support atime flexily, this commit introduces
a Kconfig option named as UBIFS_ATIME_SUPPORT.

With UBIFS_ATIME_SUPPORT=n:
	ubifs keeps the full compatibility to no_atime from
the start of ubifs.

=================UBIFS_ATIME_SUPPORT=n=======================
-o - no atime
-o atime - no atime
-o noatime - no atime
-o relatime - no atime
-o strictatime - no atime
-o lazyatime - no atime

With UBIFS_ATIME_SUPPORT=y:
	ubifs supports the atime same with other main stream
file systems.
=================UBIFS_ATIME_SUPPORT=y=======================
-o - default behavior (relatime currently)
-o atime - atime support
-o noatime - no atime support
-o relatime - relative atime support
-o strictatime - strict atime support
-o lazyatime - lazy atime support

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Richard Weinberger <richard@nod.at>
2015-11-07 11:35:08 +01:00

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config UBIFS_FS
tristate "UBIFS file system support"
select CRC16
select CRC32
select CRYPTO if UBIFS_FS_ADVANCED_COMPR
select CRYPTO if UBIFS_FS_LZO
select CRYPTO if UBIFS_FS_ZLIB
select CRYPTO_LZO if UBIFS_FS_LZO
select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
depends on MTD_UBI
help
UBIFS is a file system for flash devices which works on top of UBI.
config UBIFS_FS_ADVANCED_COMPR
bool "Advanced compression options"
depends on UBIFS_FS
help
This option allows to explicitly choose which compressions, if any,
are enabled in UBIFS. Removing compressors means inability to read
existing file systems.
If unsure, say 'N'.
config UBIFS_FS_LZO
bool "LZO compression support" if UBIFS_FS_ADVANCED_COMPR
depends on UBIFS_FS
default y
help
LZO compressor is generally faster than zlib but compresses worse.
Say 'Y' if unsure.
config UBIFS_FS_ZLIB
bool "ZLIB compression support" if UBIFS_FS_ADVANCED_COMPR
depends on UBIFS_FS
default y
help
Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
config UBIFS_ATIME_SUPPORT
bool "Access time support" if UBIFS_FS
depends on UBIFS_FS
default n
help
Originally UBIFS did not support atime, because it looked like a bad idea due
increased flash wear. This option adds atime support and it is disabled by default
to preserve the old behavior. If you enable this option, UBIFS starts updating atime,
which means that file-system read operations will cause writes (inode atime
updates). This may affect file-system performance and increase flash device wear,
so be careful. How often atime is updated depends on the selected strategy:
strictatime is the "heavy", relatime is "lighter", etc.
If unsure, say 'N'