mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-22 18:44:44 +08:00
8c1c5f2638
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>
53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
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'
|