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ext4: do not set extents feature from the kernel 

We've talked for a while about getting rid of any feature-
setting from the kernel; this gets rid of the code which would
set the INCOMPAT_EXTENTS flag on the first file write when mounted
as ext4[dev].

With this patch, if the extents feature is not already set on disk,
then mounting as ext4 will fall back to noextents with a warning,
and if -o extents is explicitly requested, the mount will fail,
also with warning.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Eric Sandeen 2008-07-11 19:27:31 -04:00 committed by Theodore Ts'o
parent c07651b556
commit e4079a11f5
2 changed files with 18 additions and 9 deletions
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6
fs/ext4/ialloc.c
View File

@ -836,14 +836,10 @@ got:
goto fail_free_drop;
if (test_opt(sb, EXTENTS)) {
/* set extent flag only for diretory, file and normal symlink*/
/* set extent flag only for directory, file and normal symlink*/
if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
ext4_ext_tree_init(handle, inode);
err = ext4_update_incompat_feature(handle, sb,
EXT4_FEATURE_INCOMPAT_EXTENTS);
if (err)
goto fail_free_drop;
}
}

21
fs/ext4/super.c
View File

@ -1324,6 +1324,13 @@ set_qf_format:
clear_opt(sbi->s_mount_opt, NOBH);
break;
case Opt_extents:
if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
EXT4_FEATURE_INCOMPAT_EXTENTS)) {
ext4_warning(sb, __func__,
"extents feature not enabled "
"on this filesystem, use tune2fs\n");
return 0;
}
set_opt (sbi->s_mount_opt, EXTENTS);
break;
case Opt_noextents:
@ -1997,12 +2004,18 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
/*
* turn on extents feature by default in ext4 filesystem
* User -o noextents to turn it off
* only if feature flag already set by mkfs or tune2fs.
* Use -o noextents to turn it off
*/
set_opt(sbi->s_mount_opt, EXTENTS);
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
set_opt(sbi->s_mount_opt, EXTENTS);
else
ext4_warning(sb, __func__,
"extents feature not enabled on this filesystem, "
"use tune2fs.\n");
/*
* turn on mballoc feature by default in ext4 filesystem
* User -o nomballoc to turn it off
* turn on mballoc code by default in ext4 filesystem
* Use -o nomballoc to turn it off
*/
set_opt(sbi->s_mount_opt, MBALLOC);