*/
/*
- * Copyright (c) 2012 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
*/
#ifndef _SYS_SPACE_MAP_H
#define _SYS_SPACE_MAP_H
#include <sys/avl.h>
+#include <sys/range_tree.h>
#include <sys/dmu.h>
#ifdef __cplusplus
extern "C" {
#endif
-typedef const struct space_map_ops space_map_ops_t;
+/*
+ * The size of the space map object has increased to include a histogram.
+ * The SPACE_MAP_SIZE_V0 designates the original size and is used to
+ * maintain backward compatibility.
+ */
+#define SPACE_MAP_SIZE_V0 (3 * sizeof (uint64_t))
+#define SPACE_MAP_HISTOGRAM_SIZE 32
+/*
+ * The space_map_phys is the on-disk representation of the space map.
+ * Consumers of space maps should never reference any of the members of this
+ * structure directly. These members may only be updated in syncing context.
+ *
+ * Note the smp_object is no longer used but remains in the structure
+ * for backward compatibility.
+ */
+typedef struct space_map_phys {
+ uint64_t smp_object; /* on-disk space map object */
+ uint64_t smp_objsize; /* size of the object */
+ uint64_t smp_alloc; /* space allocated from the map */
+ uint64_t smp_pad[5]; /* reserved */
+
+ /*
+ * The smp_histogram maintains a histogram of free regions. Each
+ * bucket, smp_histogram[i], contains the number of free regions
+ * whose size is:
+ * 2^(i+sm_shift) <= size of free region in bytes < 2^(i+sm_shift+1)
+ */
+ uint64_t smp_histogram[SPACE_MAP_HISTOGRAM_SIZE];
+} space_map_phys_t;
+
+/*
+ * The space map object defines a region of space, its size, how much is
+ * allocated, and the on-disk object that stores this information.
+ * Consumers of space maps may only access the members of this structure.
+ */
typedef struct space_map {
- avl_tree_t sm_root; /* offset-ordered segment AVL tree */
- uint64_t sm_space; /* sum of all segments in the map */
uint64_t sm_start; /* start of map */
uint64_t sm_size; /* size of map */
uint8_t sm_shift; /* unit shift */
- uint8_t sm_loaded; /* map loaded? */
- uint8_t sm_loading; /* map loading? */
- uint8_t sm_condensing; /* map condensing? */
- kcondvar_t sm_load_cv; /* map load completion */
- space_map_ops_t *sm_ops; /* space map block picker ops vector */
- avl_tree_t *sm_pp_root; /* size-ordered, picker-private tree */
- void *sm_ppd; /* picker-private data */
+ uint64_t sm_length; /* synced length */
+ uint64_t sm_alloc; /* synced space allocated */
+ objset_t *sm_os; /* objset for this map */
+ uint64_t sm_object; /* object id for this map */
+ uint32_t sm_blksz; /* block size for space map */
+ dmu_buf_t *sm_dbuf; /* space_map_phys_t dbuf */
+ space_map_phys_t *sm_phys; /* on-disk space map */
kmutex_t *sm_lock; /* pointer to lock that protects map */
} space_map_t;
-typedef struct space_seg {
- avl_node_t ss_node; /* AVL node */
- avl_node_t ss_pp_node; /* AVL picker-private node */
- uint64_t ss_start; /* starting offset of this segment */
- uint64_t ss_end; /* ending offset (non-inclusive) */
-} space_seg_t;
-
-typedef struct space_ref {
- avl_node_t sr_node; /* AVL node */
- uint64_t sr_offset; /* offset (start or end) */
- int64_t sr_refcnt; /* associated reference count */
-} space_ref_t;
-
-typedef struct space_map_obj {
- uint64_t smo_object; /* on-disk space map object */
- uint64_t smo_objsize; /* size of the object */
- uint64_t smo_alloc; /* space allocated from the map */
-} space_map_obj_t;
-
-struct space_map_ops {
- void (*smop_load)(space_map_t *sm);
- void (*smop_unload)(space_map_t *sm);
- uint64_t (*smop_alloc)(space_map_t *sm, uint64_t size);
- void (*smop_claim)(space_map_t *sm, uint64_t start, uint64_t size);
- void (*smop_free)(space_map_t *sm, uint64_t start, uint64_t size);
- uint64_t (*smop_max)(space_map_t *sm);
- boolean_t (*smop_fragmented)(space_map_t *sm);
-};
-
/*
* debug entry
*
#define SM_RUN_MAX SM_RUN_DECODE(~0ULL)
-#define SM_ALLOC 0x0
-#define SM_FREE 0x1
+typedef enum {
+ SM_ALLOC,
+ SM_FREE
+} maptype_t;
-/*
- * The data for a given space map can be kept on blocks of any size.
- * Larger blocks entail fewer i/o operations, but they also cause the
- * DMU to keep more data in-core, and also to waste more i/o bandwidth
- * when only a few blocks have changed since the last transaction group.
- * This could use a lot more research, but for now, set the freelist
- * block size to 4k (2^12).
- */
-#define SPACE_MAP_BLOCKSHIFT 12
-
-typedef void space_map_func_t(space_map_t *sm, uint64_t start, uint64_t size);
-
-extern void space_map_init(void);
-extern void space_map_fini(void);
-extern void space_map_create(space_map_t *sm, uint64_t start, uint64_t size,
- uint8_t shift, kmutex_t *lp);
-extern void space_map_destroy(space_map_t *sm);
-extern void space_map_add(space_map_t *sm, uint64_t start, uint64_t size);
-extern void space_map_remove(space_map_t *sm, uint64_t start, uint64_t size);
-extern boolean_t space_map_contains(space_map_t *sm,
- uint64_t start, uint64_t size);
-extern space_seg_t *space_map_find(space_map_t *sm, uint64_t start,
- uint64_t size, avl_index_t *wherep);
-extern void space_map_swap(space_map_t **msrc, space_map_t **mdest);
-extern void space_map_vacate(space_map_t *sm,
- space_map_func_t *func, space_map_t *mdest);
-extern void space_map_walk(space_map_t *sm,
- space_map_func_t *func, space_map_t *mdest);
-
-extern void space_map_load_wait(space_map_t *sm);
-extern int space_map_load(space_map_t *sm, space_map_ops_t *ops,
- uint8_t maptype, space_map_obj_t *smo, objset_t *os);
-extern void space_map_unload(space_map_t *sm);
-
-extern uint64_t space_map_alloc(space_map_t *sm, uint64_t size);
-extern void space_map_claim(space_map_t *sm, uint64_t start, uint64_t size);
-extern void space_map_free(space_map_t *sm, uint64_t start, uint64_t size);
-extern uint64_t space_map_maxsize(space_map_t *sm);
-
-extern void space_map_sync(space_map_t *sm, uint8_t maptype,
- space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx);
-extern void space_map_truncate(space_map_obj_t *smo,
- objset_t *os, dmu_tx_t *tx);
-
-extern void space_map_ref_create(avl_tree_t *t);
-extern void space_map_ref_destroy(avl_tree_t *t);
-extern void space_map_ref_add_seg(avl_tree_t *t,
- uint64_t start, uint64_t end, int64_t refcnt);
-extern void space_map_ref_add_map(avl_tree_t *t,
- space_map_t *sm, int64_t refcnt);
-extern void space_map_ref_generate_map(avl_tree_t *t,
- space_map_t *sm, int64_t minref);
+int space_map_load(space_map_t *sm, range_tree_t *rt, maptype_t maptype);
+
+void space_map_histogram_clear(space_map_t *sm);
+void space_map_histogram_add(space_map_t *sm, range_tree_t *rt,
+ dmu_tx_t *tx);
+
+void space_map_update(space_map_t *sm);
+
+uint64_t space_map_object(space_map_t *sm);
+uint64_t space_map_allocated(space_map_t *sm);
+uint64_t space_map_length(space_map_t *sm);
+
+void space_map_write(space_map_t *sm, range_tree_t *rt, maptype_t maptype,
+ dmu_tx_t *tx);
+void space_map_truncate(space_map_t *sm, dmu_tx_t *tx);
+uint64_t space_map_alloc(objset_t *os, dmu_tx_t *tx);
+void space_map_free(space_map_t *sm, dmu_tx_t *tx);
+
+int space_map_open(space_map_t **smp, objset_t *os, uint64_t object,
+ uint64_t start, uint64_t size, uint8_t shift, kmutex_t *lp);
+void space_map_close(space_map_t *sm);
+
+int64_t space_map_alloc_delta(space_map_t *sm);
#ifdef __cplusplus
}
projects / mirror_zfs-debian.git / blobdiff