[Ocfs2-devel] Tiny patch for cached ACLs support

[Tristan Ye <tristan.ye@oracle.com>]

jeff.liu wrote:
> Tao Ma wrote:
>> On 03/31/2011 04:51 PM, jeff.liu wrote:
>>> Hi Tao,
>>>
>>> Tao Ma wrote:
>>>> Hi Jeff,
>>>> On 03/31/2011 04:28 PM, jeff.liu wrote:
>>>>> Hello,
>>>>>
>>>>> Below is a tiny patch for adding cached ACLs support to OCFS2, I have run a few simple tests like
>>>>> getacl/setacl/chacl on my single node OCFS2, it works for me.
>>>> Your codes seem to not handle the case of cross node update? See node A
>>>> updates ACL, node B should abandon the old one.
>>> IMHO, cached ACLs are stored at VFS for each node instead of being synchronized among multiple
>>> nodes, hence it doesn't need to take care of that.
>> yes, it is stored in VFS, so we have to synchronize it like i_size and
>> other inode stuff and that's why the user need a cluster file system.;)
>> cached ACLs is used to speed up acl read, but not to have different acls
>> from different nodes.
> You are right, I'll figure out a way for the synchronization.

Hi Jeff,

	Maybe we can do this in downconverting thread like other caches(dentry,
file-data etc), take the 'ocfs2_refcount_convert_worker' as a reference.

Tristan


> 
> Thanks,
> -Jeff
>> Regards,
>> Tao
>>> Thanks,
>>> -Jeff
>>>> Regards,
>>>> Tao
>>>>> Any comments and testing are appreciated.
>>>>>
>>>>> Thanks,
>>>>> -Jeff
>>>>>
>>>>>
>>>>> Signed-off-by: Jeff Liu <jeff.liu@oracle.com>
>>>>> ---
>>>>>  fs/ocfs2/acl.c   |   12 +++++++++++-
>>>>>  fs/ocfs2/inode.c |    4 ++++
>>>>>  2 files changed, 15 insertions(+), 1 deletions(-)
>>>>>
>>>>> diff --git a/fs/ocfs2/acl.c b/fs/ocfs2/acl.c
>>>>> index 704f6b1..13c58b0 100644
>>>>> --- a/fs/ocfs2/acl.c
>>>>> +++ b/fs/ocfs2/acl.c
>>>>> @@ -152,6 +152,10 @@ static struct posix_acl *ocfs2_get_acl(struct inode *inode, int type)
>>>>>  	if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL))
>>>>>  		return NULL;
>>>>>
>>>>> +	acl = get_cached_acl(inode, type);
>>>>> +	if (acl != ACL_NOT_CACHED)
>>>>> +		return acl;
>>>>> +
>>>>>  	ret = ocfs2_inode_lock(inode, &di_bh, 0);
>>>>>  	if (ret < 0) {
>>>>>  		mlog_errno(ret);
>>>>> @@ -286,6 +290,9 @@ static int ocfs2_set_acl(handle_t *handle,
>>>>>  	else
>>>>>  		ret = ocfs2_xattr_set(inode, name_index, "", value, size, 0);
>>>>>
>>>>> +	if (!ret)
>>>>> +		set_cached_acl(inode, type, acl);
>>>>> +
>>>>>  	kfree(value);
>>>>>
>>>>>  	return ret;
>>>>> @@ -348,9 +355,12 @@ int ocfs2_acl_chmod(struct inode *inode)
>>>>>  	if (!clone)
>>>>>  		return -ENOMEM;
>>>>>  	ret = posix_acl_chmod_masq(clone, inode->i_mode);
>>>>> -	if (!ret)
>>>>> +	if (!ret) {
>>>>>  		ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS,
>>>>>  				    clone, NULL, NULL);
>>>>> +		set_cached_acl(inode, ACL_TYPE_ACCESS, clone);
>>>>> +	}
>>>>> +
>>>>>  	posix_acl_release(clone);
>>>>>  	return ret;
>>>>>  }
>>>>> diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
>>>>> index 4068c6c..80deac8 100644
>>>>> --- a/fs/ocfs2/inode.c
>>>>> +++ b/fs/ocfs2/inode.c
>>>>> @@ -28,6 +28,7 @@
>>>>>  #include <linux/highmem.h>
>>>>>  #include <linux/pagemap.h>
>>>>>  #include <linux/quotaops.h>
>>>>> +#include <linux/posix_acl.h>
>>>>>
>>>>>  #include <asm/byteorder.h>
>>>>>
>>>>> @@ -783,6 +784,9 @@ static int ocfs2_wipe_inode(struct inode *inode,
>>>>>  		goto bail_unlock_dir;
>>>>>  	}
>>>>>
>>>>> +	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)
>>>>> +		forget_all_cached_acls(inode);
>>>>> +
>>>>>  	status = ocfs2_remove_refcount_tree(inode, di_bh);
>>>>>  	if (status < 0) {
>>>>>  		mlog_errno(status);
> 
> 
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