ceph: change ceph.file.layout.* implementation, content

Implement a new method to generate the ceph.file.layout vxattr using
the new framework.

Use 'stripe_unit' instead of 'chunk_size'.

Include pool name, either as a string or as an integer.
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Sam Lang <sam.lang@inktank.com>

fs/ceph/xattr.c

@@ -33,6 +33,50 @@ struct ceph_vxattr {
 	bool (*exists_cb)(struct ceph_inode_info *ci);
 };
 
+/* layouts */
+
+static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
+{
+	size_t s;
+	char *p = (char *)&ci->i_layout;
+
+	for (s = 0; s < sizeof(ci->i_layout); s++, p++)
+		if (*p)
+			return true;
+	return false;
+}
+
+static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
+					size_t size)
+{
+	int ret;
+	struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
+	struct ceph_osd_client *osdc = &fsc->client->osdc;
+	s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
+	const char *pool_name;
+
+	dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
+	down_read(&osdc->map_sem);
+	pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
+	if (pool_name)
+		ret = snprintf(val, size,
+		"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%s",
+		(unsigned long long)ceph_file_layout_su(ci->i_layout),
+		(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
+	        (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
+		pool_name);
+	else
+		ret = snprintf(val, size,
+		"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
+		(unsigned long long)ceph_file_layout_su(ci->i_layout),
+		(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
+	        (unsigned long long)ceph_file_layout_object_size(ci->i_layout),
+		(unsigned long long)pool);
+
+	up_read(&osdc->map_sem);
+	return ret;
+}
+
 /* directories */
 
 static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
@@ -84,6 +128,7 @@ static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
 			(long)ci->i_rctime.tv_nsec);
 }
 
+
 #define CEPH_XATTR_NAME(_type, _name)	XATTR_CEPH_PREFIX #_type "." #_name
 
 #define XATTR_NAME_CEPH(_type, _name)					\
@@ -111,21 +156,15 @@ static size_t ceph_dir_vxattrs_name_size;	/* total size of all names */
 
 /* files */
 
-static size_t ceph_vxattrcb_file_layout(struct ceph_inode_info *ci, char *val,
-				   size_t size)
-{
-	int ret;
-
-	ret = snprintf(val, size,
-		"chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n",
-		(unsigned long long)ceph_file_layout_su(ci->i_layout),
-		(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
-		(unsigned long long)ceph_file_layout_object_size(ci->i_layout));
-	return ret;
-}
-
 static struct ceph_vxattr ceph_file_vxattrs[] = {
-	XATTR_NAME_CEPH(file, layout),
+	{
+		.name = "ceph.file.layout",
+		.name_size = sizeof("ceph.file.layout"),
+		.getxattr_cb = ceph_vxattrcb_layout,
+		.readonly = false,
+		.hidden = false,
+		.exists_cb = ceph_vxattrcb_layout_exists,
+	},
 	{ 0 }	/* Required table terminator */
 };
 static size_t ceph_file_vxattrs_name_size;	/* total size of all names */