diff options
Diffstat (limited to 'fs/ext3')
| -rw-r--r-- | fs/ext3/Kconfig | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/fs/ext3/Kconfig b/fs/ext3/Kconfig index fb3c1a21b135..522b15498f45 100644 --- a/fs/ext3/Kconfig +++ b/fs/ext3/Kconfig | |||
| @@ -29,23 +29,25 @@ config EXT3_FS | |||
| 29 | module will be called ext3. | 29 | module will be called ext3. |
| 30 | 30 | ||
| 31 | config EXT3_DEFAULTS_TO_ORDERED | 31 | config EXT3_DEFAULTS_TO_ORDERED |
| 32 | bool "Default to 'data=ordered' in ext3 (legacy option)" | 32 | bool "Default to 'data=ordered' in ext3" |
| 33 | depends on EXT3_FS | 33 | depends on EXT3_FS |
| 34 | help | 34 | help |
| 35 | If a filesystem does not explicitly specify a data ordering | 35 | The journal mode options for ext3 have different tradeoffs |
| 36 | mode, and the journal capability allowed it, ext3 used to | 36 | between when data is guaranteed to be on disk and |
| 37 | historically default to 'data=ordered'. | 37 | performance. The use of "data=writeback" can cause |
| 38 | 38 | unwritten data to appear in files after an system crash or | |
| 39 | That was a rather unfortunate choice, because it leads to all | 39 | power failure, which can be a security issue. However, |
| 40 | kinds of latency problems, and the 'data=writeback' mode is more | 40 | "data=ordered" mode can also result in major performance |
| 41 | appropriate these days. | 41 | problems, including seconds-long delays before an fsync() |
| 42 | 42 | call returns. For details, see: | |
| 43 | You should probably always answer 'n' here, and if you really | 43 | |
| 44 | want to use 'data=ordered' mode, set it in the filesystem itself | 44 | http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs |
| 45 | with 'tune2fs -o journal_data_ordered'. | 45 | |
| 46 | 46 | If you have been historically happy with ext3's performance, | |
| 47 | But if you really want to enable the legacy default, you can do | 47 | data=ordered mode will be a safe choice and you should |
| 48 | so by answering 'y' to this question. | 48 | answer 'y' here. If you understand the reliability and data |
| 49 | privacy issues of data=writeback and are willing to make | ||
| 50 | that trade off, answer 'n'. | ||
| 49 | 51 | ||
| 50 | config EXT3_FS_XATTR | 52 | config EXT3_FS_XATTR |
| 51 | bool "Ext3 extended attributes" | 53 | bool "Ext3 extended attributes" |