knfsd needs i_version updates on, as will userspace nfs servers and
probably others.
The only effects are that inode->i_version is bumped (under the i_lock)
in more places, and that ->dirty_inode(I_DIRTY_DATASYNC) may be called
more frequently than once per jiffy on write (see file_update_time).
However the latter appears to be mostly a no-op in that case.
So, simplify our life and just keep this feature turned on all the time.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
fs/ext4/super.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
If people are worried that the performance impact isn't obvious, I'll
find the time somehow to test this properly....
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index e1fb1d5..a99f827 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1483,7 +1483,7 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
return 1;
case Opt_i_version:
- sb->s_flags |= MS_I_VERSION;
+ /* no-op; this is on by default now */
return 1;
case Opt_journal_dev:
if (is_remount) {
@@ -2979,6 +2979,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
goto out_free_orig;
}
sb->s_fs_info = sbi;
+ sb->s_flags |= MS_I_VERSION;
sbi->s_mount_opt = 0;
sbi->s_resuid = EXT4_DEF_RESUID;
sbi->s_resgid = EXT4_DEF_RESGID;
--
1.7.9.5
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