[Ocfs2-devel] [PATCH] ocfs2: free meta_ac and data_ac when ocfs2_start_trans fails in ocfs2_xattr_set()
Younger Liu
younger.liu at huawei.com
Tue Aug 6 19:03:09 PDT 2013
On 2013/8/7 6:44, Jeff Liu wrote:
> On 08/01/2013 05:02 PM, Younger Liu wrote:
>
>> In ocfs2_xattr_set(), if ocfs2_start_trans failed,
>> meta_ac and data_ac should be free.
>> Otherwise, It would lead to memory leak.
>>
>> Signed-off-by: Younger Liu <younger.liu at huawei.com>
>> Cc: Joseph Qi <joseph.qi at huawei.com>
>> ---
>> fs/ocfs2/xattr.c | 5 +++--
>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
>> index 317ef0a..1c2a892 100644
>> --- a/fs/ocfs2/xattr.c
>> +++ b/fs/ocfs2/xattr.c
>> @@ -3505,7 +3505,7 @@ int ocfs2_xattr_set(struct inode *inode,
>> int ret, credits, ref_meta = 0, ref_credits = 0;
>> struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
>> struct inode *tl_inode = osb->osb_tl_inode;
>> - struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
>> + struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, NULL, };
>> struct ocfs2_refcount_tree *ref_tree = NULL;
>>
>> struct ocfs2_xattr_info xi = {
>> @@ -3609,13 +3609,14 @@ int ocfs2_xattr_set(struct inode *inode,
>> if (IS_ERR(ctxt.handle)) {
>> ret = PTR_ERR(ctxt.handle);
>> mlog_errno(ret);
>> - goto cleanup;
>> + goto out_free_ac;
>> }
>>
>> ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
>>
>> ocfs2_commit_trans(osb, ctxt.handle);
>>
>> +out_free_ac:
>> if (ctxt.data_ac)
>> ocfs2_free_alloc_context(ctxt.data_ac);
>> if (ctxt.meta_ac)
>
> Yes, we should free the allocated contex in this case.
> However, we don't performs the log truncation as well as the delayed allocation
> business as per the old logic.
>
> Srinivas,
>
> How do you think about this fix?
>
> Thanks,
> -Jeff
>
In ocfs2_init_xattr_set_ctxt(), the allocated contex is initialized,
(&ctxt.dealloc)->c_global_allocator and (&ctxt.dealloc)->
c_first_suballocator are set to NULL.
After applying the patch, if ocfs2_start_trans fails, we would free
meta_ac/data_ac, but not perform truncate_log_flush/ocfs2_run_deallocs.
So, it would take no side effect to the function.
Thanks.
--Younger
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