GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-07 15:18:15 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

ext3: make default data ordering mode configurable

Browse source 
This makes the defautl ext3 data ordering mode (when no explicit
ordering is set) configurable, so as to allow people to default to
'data=writeback' and get the resulting latency improvements.

This is a non-issue if a filesystem has been explicitly set to some
ordering (with 'tune2fs').

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2009-04-06 17:16:47 -07:00
parent e0724bf6e4
commit bbae8bcc49
2 changed files with 26 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
fs/ext3/Kconfig
View file

@ -28,6 +28,25 @@ config EXT3_FS
To compile this file system support as a module, choose M here: the To compile this file system support as a module, choose M here: the
module will be called ext3. module will be called ext3.
config EXT3_DEFAULTS_TO_ORDERED
bool "Default to 'data=ordered' in ext3 (legacy option)"
depends on EXT3_FS
help
If a filesystem does not explicitly specify a data ordering
mode, and the journal capability allowed it, ext3 used to
historically default to 'data=ordered'.
That was a rather unfortunate choice, because it leads to all
kinds of latency problems, and the 'data=writeback' mode is more
appropriate these days.
You should probably always answer 'n' here, and if you really
want to use 'data=ordered' mode, set it in the filesystem itself
with 'tune2fs -o journal_data_ordered'.
But if you really want to enable the legacy default, you can do
so by answering 'y' to this question.
config EXT3_FS_XATTR config EXT3_FS_XATTR
bool "Ext3 extended attributes" bool "Ext3 extended attributes"
depends on EXT3_FS depends on EXT3_FS

8
fs/ext3/super.c
View file

@ -44,6 +44,12 @@
#include "acl.h" #include "acl.h"
#include "namei.h" #include "namei.h"
#ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED
#define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA
#else
#define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA
#endif
static int ext3_load_journal(struct super_block *, struct ext3_super_block *, static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
unsigned long journal_devnum); unsigned long journal_devnum);
static int ext3_create_journal(struct super_block *, struct ext3_super_block *, static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
@ -1919,7 +1925,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
cope, else JOURNAL_DATA */ cope, else JOURNAL_DATA */
if (journal_check_available_features if (journal_check_available_features
(sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
set_opt(sbi->s_mount_opt, ORDERED_DATA); set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE);
else else
set_opt(sbi->s_mount_opt, JOURNAL_DATA); set_opt(sbi->s_mount_opt, JOURNAL_DATA);
break; break;