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ext4: wait for log to commit when umounting 

There is a potential race when a transaction is committing right when
the file system is being umounting.  This could reduce in a race
because EXT4_SB(sb)->s_group_info could be freed in ext4_put_super
before the commit code calls a callback so the mballoc code can
release freed blocks in the transaction, resulting in a panic trying
to access the freed s_group_info.

The fix is to wait for the transaction to finish committing before we
shutdown the multiblock allocator.  

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Josef Bacik 2009-12-08 21:48:58 -05:00 committed by Theodore Ts'o
parent b9a4207d5e
commit d4edac314e
1 changed files with 6 additions and 4 deletions
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10
fs/ext4/super.c
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@ -603,10 +603,6 @@ static void ext4_put_super(struct super_block *sb)
if (sb->s_dirt)
ext4_commit_super(sb, 1);
ext4_release_system_zone(sb);
ext4_mb_release(sb);
ext4_ext_release(sb);
ext4_xattr_put_super(sb);
if (sbi->s_journal) {
err = jbd2_journal_destroy(sbi->s_journal);
sbi->s_journal = NULL;
@ -614,6 +610,12 @@ static void ext4_put_super(struct super_block *sb)
ext4_abort(sb, __func__,
"Couldn't clean up the journal");
}
ext4_release_system_zone(sb);
ext4_mb_release(sb);
ext4_ext_release(sb);
ext4_xattr_put_super(sb);
if (!(sb->s_flags & MS_RDONLY)) {
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
es->s_state = cpu_to_le16(sbi->s_mount_state);