1 files changed, 95 insertions, 0 deletions

diff --git a/fs/ocfs2/ocfs2_ioctl.h b/fs/ocfs2/ocfs2_ioctl.h
index 5d241505690b..b46f39bf7438 100644
--- a/fs/ocfs2/ocfs2_ioctl.h
+++ b/fs/ocfs2/ocfs2_ioctl.h
@@ -76,4 +76,99 @@ struct reflink_arguments {
 };
 #define OCFS2_IOC_REFLINK       _IOW('o', 4, struct reflink_arguments)
 
+/* Following definitions dedicated for ocfs2_info_request ioctls. */
+#define OCFS2_INFO_MAX_REQUEST          (50)
+#define OCFS2_TEXT_UUID_LEN             (OCFS2_VOL_UUID_LEN * 2)
+
+/* Magic number of all requests */
+#define OCFS2_INFO_MAGIC                (0x4F32494E)
+
+/*
+ * Always try to separate info request into small pieces to
+ * guarantee the backward&forward compatibility.
+ */
+struct ocfs2_info {
+        __u64 oi_requests;      /* Array of __u64 pointers to requests */
+        __u32 oi_count;         /* Number of requests in info_requests */
+        __u32 oi_pad;
+};
+
+struct ocfs2_info_request {
+/*00*/  __u32 ir_magic; /* Magic number */
+        __u32 ir_code;  /* Info request code */
+        __u32 ir_size;  /* Size of request */
+        __u32 ir_flags; /* Request flags */
+/*10*/                  /* Request specific fields */
+};
+
+struct ocfs2_info_clustersize {
+        struct ocfs2_info_request ic_req;
+        __u32 ic_clustersize;
+        __u32 ic_pad;
+};
+
+struct ocfs2_info_blocksize {
+        struct ocfs2_info_request ib_req;
+        __u32 ib_blocksize;
+        __u32 ib_pad;
+};
+
+struct ocfs2_info_maxslots {
+        struct ocfs2_info_request im_req;
+        __u32 im_max_slots;
+        __u32 im_pad;
+};
+
+struct ocfs2_info_label {
+        struct ocfs2_info_request il_req;
+        __u8    il_label[OCFS2_MAX_VOL_LABEL_LEN];
+} __attribute__ ((packed));
+
+struct ocfs2_info_uuid {
+        struct ocfs2_info_request iu_req;
+        __u8    iu_uuid_str[OCFS2_TEXT_UUID_LEN + 1];
+} __attribute__ ((packed));
+
+struct ocfs2_info_fs_features {
+        struct ocfs2_info_request if_req;
+        __u32 if_compat_features;
+        __u32 if_incompat_features;
+        __u32 if_ro_compat_features;
+        __u32 if_pad;
+};
+
+struct ocfs2_info_journal_size {
+        struct ocfs2_info_request ij_req;
+        __u64 ij_journal_size;
+};
+
+/* Codes for ocfs2_info_request */
+enum ocfs2_info_type {
+        OCFS2_INFO_CLUSTERSIZE = 1,
+        OCFS2_INFO_BLOCKSIZE,
+        OCFS2_INFO_MAXSLOTS,
+        OCFS2_INFO_LABEL,
+        OCFS2_INFO_UUID,
+        OCFS2_INFO_FS_FEATURES,
+        OCFS2_INFO_JOURNAL_SIZE,
+        OCFS2_INFO_NUM_TYPES
+};
+
+/* Flags for struct ocfs2_info_request */
+/* Filled by the caller */
+#define OCFS2_INFO_FL_NON_COHERENT      (0x00000001)    /* Cluster coherency not
+                                                           required. This is a hint.
+                                                           It is up to ocfs2 whether
+                                                           the request can be fulfilled
+                                                           without locking. */
+/* Filled by ocfs2 */
+#define OCFS2_INFO_FL_FILLED            (0x40000000)    /* Filesystem understood
+                                                           this request and
+                                                           filled in the answer */
+
+#define OCFS2_INFO_FL_ERROR             (0x80000000)    /* Error happened during
+                                                           request handling. */
+
+#define OCFS2_IOC_INFO          _IOR('o', 5, struct ocfs2_info)
+
 #endif /* OCFS2_IOCTL_H */