Initial import

1 files changed, 224 insertions, 0 deletions

diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
new file mode 100644
index 000000000..e55c08bc3
--- /dev/null
+++ b/include/linux/ceph/osdmap.h
@@ -0,0 +1,224 @@
+#ifndef _FS_CEPH_OSDMAP_H
+#define _FS_CEPH_OSDMAP_H
+
+#include <linux/rbtree.h>
+#include <linux/ceph/types.h>
+#include <linux/ceph/decode.h>
+#include <linux/ceph/ceph_fs.h>
+#include <linux/crush/crush.h>
+
+/*
+ * The osd map describes the current membership of the osd cluster and
+ * specifies the mapping of objects to placement groups and placement
+ * groups to (sets of) osds.  That is, it completely specifies the
+ * (desired) distribution of all data objects in the system at some
+ * point in time.
+ *
+ * Each map version is identified by an epoch, which increases monotonically.
+ *
+ * The map can be updated either via an incremental map (diff) describing
+ * the change between two successive epochs, or as a fully encoded map.
+ */
+struct ceph_pg {
+	uint64_t pool;
+	uint32_t seed;
+};
+
+#define CEPH_POOL_FLAG_HASHPSPOOL  1
+
+struct ceph_pg_pool_info {
+	struct rb_node node;
+	s64 id;
+	u8 type;
+	u8 size;
+	u8 crush_ruleset;
+	u8 object_hash;
+	u32 pg_num, pgp_num;
+	int pg_num_mask, pgp_num_mask;
+	s64 read_tier;
+	s64 write_tier; /* wins for read+write ops */
+	u64 flags;
+	char *name;
+};
+
+static inline bool ceph_can_shift_osds(struct ceph_pg_pool_info *pool)
+{
+	switch (pool->type) {
+	case CEPH_POOL_TYPE_REP:
+		return true;
+	case CEPH_POOL_TYPE_EC:
+		return false;
+	default:
+		BUG_ON(1);
+	}
+}
+
+struct ceph_object_locator {
+	s64 pool;
+};
+
+/*
+ * Maximum supported by kernel client object name length
+ *
+ * (probably outdated: must be >= RBD_MAX_MD_NAME_LEN -- currently 100)
+ */
+#define CEPH_MAX_OID_NAME_LEN 100
+
+struct ceph_object_id {
+	char name[CEPH_MAX_OID_NAME_LEN];
+	int name_len;
+};
+
+struct ceph_pg_mapping {
+	struct rb_node node;
+	struct ceph_pg pgid;
+
+	union {
+		struct {
+			int len;
+			int osds[];
+		} pg_temp;
+		struct {
+			int osd;
+		} primary_temp;
+	};
+};
+
+struct ceph_osdmap {
+	struct ceph_fsid fsid;
+	u32 epoch;
+	u32 mkfs_epoch;
+	struct ceph_timespec created, modified;
+
+	u32 flags;         /* CEPH_OSDMAP_* */
+
+	u32 max_osd;       /* size of osd_state, _offload, _addr arrays */
+	u8 *osd_state;     /* CEPH_OSD_* */
+	u32 *osd_weight;   /* 0 = failed, 0x10000 = 100% normal */
+	struct ceph_entity_addr *osd_addr;
+
+	struct rb_root pg_temp;
+	struct rb_root primary_temp;
+
+	u32 *osd_primary_affinity;
+
+	struct rb_root pg_pools;
+	u32 pool_max;
+
+	/* the CRUSH map specifies the mapping of placement groups to
+	 * the list of osds that store+replicate them. */
+	struct crush_map *crush;
+
+	struct mutex crush_scratch_mutex;
+	int crush_scratch_ary[CEPH_PG_MAX_SIZE * 3];
+};
+
+static inline void ceph_oid_set_name(struct ceph_object_id *oid,
+				     const char *name)
+{
+	int len;
+
+	len = strlen(name);
+	if (len > sizeof(oid->name)) {
+		WARN(1, "ceph_oid_set_name '%s' len %d vs %zu, truncating\n",
+		     name, len, sizeof(oid->name));
+		len = sizeof(oid->name);
+	}
+
+	memcpy(oid->name, name, len);
+	oid->name_len = len;
+}
+
+static inline void ceph_oid_copy(struct ceph_object_id *dest,
+				 struct ceph_object_id *src)
+{
+	BUG_ON(src->name_len > sizeof(dest->name));
+	memcpy(dest->name, src->name, src->name_len);
+	dest->name_len = src->name_len;
+}
+
+static inline int ceph_osd_exists(struct ceph_osdmap *map, int osd)
+{
+	return osd >= 0 && osd < map->max_osd &&
+	       (map->osd_state[osd] & CEPH_OSD_EXISTS);
+}
+
+static inline int ceph_osd_is_up(struct ceph_osdmap *map, int osd)
+{
+	return ceph_osd_exists(map, osd) &&
+	       (map->osd_state[osd] & CEPH_OSD_UP);
+}
+
+static inline int ceph_osd_is_down(struct ceph_osdmap *map, int osd)
+{
+	return !ceph_osd_is_up(map, osd);
+}
+
+static inline bool ceph_osdmap_flag(struct ceph_osdmap *map, int flag)
+{
+	return map && (map->flags & flag);
+}
+
+extern char *ceph_osdmap_state_str(char *str, int len, int state);
+extern u32 ceph_get_primary_affinity(struct ceph_osdmap *map, int osd);
+
+static inline struct ceph_entity_addr *ceph_osd_addr(struct ceph_osdmap *map,
+						     int osd)
+{
+	if (osd >= map->max_osd)
+		return NULL;
+	return &map->osd_addr[osd];
+}
+
+static inline int ceph_decode_pgid(void **p, void *end, struct ceph_pg *pgid)
+{
+	__u8 version;
+
+	if (!ceph_has_room(p, end, 1 + 8 + 4 + 4)) {
+		pr_warn("incomplete pg encoding\n");
+		return -EINVAL;
+	}
+	version = ceph_decode_8(p);
+	if (version > 1) {
+		pr_warn("do not understand pg encoding %d > 1\n",
+			(int)version);
+		return -EINVAL;
+	}
+
+	pgid->pool = ceph_decode_64(p);
+	pgid->seed = ceph_decode_32(p);
+	*p += 4;	/* skip deprecated preferred value */
+
+	return 0;
+}
+
+extern struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end);
+extern struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
+					    struct ceph_osdmap *map,
+					    struct ceph_messenger *msgr);
+extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
+
+/* calculate mapping of a file extent to an object */
+extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
+					 u64 off, u64 len,
+					 u64 *bno, u64 *oxoff, u64 *oxlen);
+
+/* calculate mapping of object to a placement group */
+extern int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
+			       struct ceph_object_locator *oloc,
+			       struct ceph_object_id *oid,
+			       struct ceph_pg *pg_out);
+
+extern int ceph_calc_pg_acting(struct ceph_osdmap *osdmap,
+			       struct ceph_pg pgid,
+			       int *osds, int *primary);
+extern int ceph_calc_pg_primary(struct ceph_osdmap *osdmap,
+				struct ceph_pg pgid);
+
+extern struct ceph_pg_pool_info *ceph_pg_pool_by_id(struct ceph_osdmap *map,
+						    u64 id);
+
+extern const char *ceph_pg_pool_name_by_id(struct ceph_osdmap *map, u64 id);
+extern int ceph_pg_poolid_by_name(struct ceph_osdmap *map, const char *name);
+
+#endif