ext4: Initialize preallocation list_head's properly

(cherry picked from commit d794bf8e0936dce45104565cd48c571061f4c1e3)

When creating a new ext4_prealloc_space structure, we have to
initialize its list_head pointers before we add them to any prealloc
lists.  Otherwise, with list debug enabled, we will get list
corruption warnings.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 28b261b1a86648ab6da956b92178a5458d270ae4..f8e923fc784e04ab313db91b75d84068273e6356 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3690,6 +3690,8 @@ ext4_mb_new_inode_pa(struct ext4_allocation_context *ac)
        pa->pa_free = pa->pa_len;
        atomic_set(&pa->pa_count, 1);
        spin_lock_init(&pa->pa_lock);
+       INIT_LIST_HEAD(&pa->pa_inode_list);
+       INIT_LIST_HEAD(&pa->pa_group_list);
        pa->pa_deleted = 0;
        pa->pa_linear = 0;
 
@@ -3748,6 +3750,7 @@ ext4_mb_new_group_pa(struct ext4_allocation_context *ac)
        atomic_set(&pa->pa_count, 1);
        spin_lock_init(&pa->pa_lock);
        INIT_LIST_HEAD(&pa->pa_inode_list);
+       INIT_LIST_HEAD(&pa->pa_group_list);
        pa->pa_deleted = 0;
        pa->pa_linear = 1;