[Ocfs2-devel] Tiny patch for cached ACLs support

[jeff.liu <jeff.liu@oracle.com>]

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.

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);
>