ceph: rados pool namespace support

This patch adds codes that decode pool namespace information in
cap message and request reply. Pool namespace is saved in i_layout,
it will be passed to libceph when doing read/write.

Signed-off-by: Yan, Zheng <zyan@redhat.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index d035e0ab6029..dc032566ed71 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -447,7 +447,6 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
 
 	memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
 	RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
-	ci->i_pool_ns_len = 0;
 
 	ci->i_fragtree = RB_ROOT;
 	mutex_init(&ci->i_fragtree_mutex);
@@ -571,7 +570,7 @@ void ceph_destroy_inode(struct inode *inode)
 	if (ci->i_xattrs.prealloc_blob)
 		ceph_buffer_put(ci->i_xattrs.prealloc_blob);
 
-	ceph_put_string(ci->i_layout.pool_ns);
+	ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
 
 	call_rcu(&inode->i_rcu, ceph_i_callback);
 }
@@ -736,6 +735,7 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
 	int issued = 0, implemented, new_issued;
 	struct timespec mtime, atime, ctime;
 	struct ceph_buffer *xattr_blob = NULL;
+	struct ceph_string *pool_ns = NULL;
 	struct ceph_cap *new_cap = NULL;
 	int err = 0;
 	bool wake = false;
@@ -763,6 +763,10 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
 			       iinfo->xattr_len);
 	}
 
+	if (iinfo->pool_ns_len > 0)
+		pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
+						     iinfo->pool_ns_len);
+
 	spin_lock(&ci->i_ceph_lock);
 
 	/*
@@ -818,11 +822,18 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
 	if (new_version ||
 	    (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
 		s64 old_pool = ci->i_layout.pool_id;
+		struct ceph_string *old_ns;
+
 		ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
-		ci->i_pool_ns_len = iinfo->pool_ns_len;
-		if (ci->i_layout.pool_id != old_pool)
+		old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
+					lockdep_is_held(&ci->i_ceph_lock));
+		rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
+
+		if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
 			ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
 
+		pool_ns = old_ns;
+
 		queue_trunc = ceph_fill_file_size(inode, issued,
 					le32_to_cpu(info->truncate_seq),
 					le64_to_cpu(info->truncate_size),
@@ -989,6 +1000,7 @@ out:
 		ceph_put_cap(mdsc, new_cap);
 	if (xattr_blob)
 		ceph_buffer_put(xattr_blob);
+	ceph_put_string(pool_ns);
 	return err;
 }