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authorJosef Bacik <josef@redhat.com>2009-12-08 21:48:58 -0500
committerTheodore Ts'o <tytso@mit.edu>2009-12-08 21:48:58 -0500
commitd4edac314e9ad0b21ba20ba8bc61b61f186f79e1 (patch)
treeaf44b291976308b9db6c215cb2dc03bbe020d6fc /fs/ext4
parentb9a4207d5e911b938f73079a83cc2ae10524ec7f (diff)
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>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/super.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 30476daf966..8ab0c951847 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -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);