d3cc8b152e
3742 zfs comments need cleaner, more consistent style Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Approved by: Christopher Siden <christopher.siden@delphix.com> References: https://www.illumos.org/issues/3742 illumos/illumos-gate@f717074149 Ported-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1775 Porting notes: 1. The change to zfs_vfsops.c was dropped because it involves zfs_mount_label_policy, which does not exist in the Linux port.
188 lines
6.8 KiB
C
188 lines
6.8 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2012 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_SPACE_MAP_H
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#define _SYS_SPACE_MAP_H
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#include <sys/avl.h>
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#include <sys/dmu.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef const struct space_map_ops space_map_ops_t;
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typedef struct space_map {
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avl_tree_t sm_root; /* offset-ordered segment AVL tree */
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uint64_t sm_space; /* sum of all segments in the map */
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uint64_t sm_start; /* start of map */
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uint64_t sm_size; /* size of map */
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uint8_t sm_shift; /* unit shift */
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uint8_t sm_loaded; /* map loaded? */
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uint8_t sm_loading; /* map loading? */
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uint8_t sm_condensing; /* map condensing? */
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kcondvar_t sm_load_cv; /* map load completion */
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space_map_ops_t *sm_ops; /* space map block picker ops vector */
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avl_tree_t *sm_pp_root; /* size-ordered, picker-private tree */
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void *sm_ppd; /* picker-private data */
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kmutex_t *sm_lock; /* pointer to lock that protects map */
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} space_map_t;
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typedef struct space_seg {
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avl_node_t ss_node; /* AVL node */
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avl_node_t ss_pp_node; /* AVL picker-private node */
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uint64_t ss_start; /* starting offset of this segment */
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uint64_t ss_end; /* ending offset (non-inclusive) */
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} space_seg_t;
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typedef struct space_ref {
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avl_node_t sr_node; /* AVL node */
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uint64_t sr_offset; /* offset (start or end) */
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int64_t sr_refcnt; /* associated reference count */
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} space_ref_t;
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typedef struct space_map_obj {
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uint64_t smo_object; /* on-disk space map object */
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uint64_t smo_objsize; /* size of the object */
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uint64_t smo_alloc; /* space allocated from the map */
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} space_map_obj_t;
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struct space_map_ops {
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void (*smop_load)(space_map_t *sm);
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void (*smop_unload)(space_map_t *sm);
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uint64_t (*smop_alloc)(space_map_t *sm, uint64_t size);
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void (*smop_claim)(space_map_t *sm, uint64_t start, uint64_t size);
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void (*smop_free)(space_map_t *sm, uint64_t start, uint64_t size);
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uint64_t (*smop_max)(space_map_t *sm);
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boolean_t (*smop_fragmented)(space_map_t *sm);
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};
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/*
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* debug entry
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*
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* 1 3 10 50
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* ,---+--------+------------+---------------------------------.
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* | 1 | action | syncpass | txg (lower bits) |
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* `---+--------+------------+---------------------------------'
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* 63 62 60 59 50 49 0
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*
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*
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* non-debug entry
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*
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* 1 47 1 15
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* ,-----------------------------------------------------------.
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* | 0 | offset (sm_shift units) | type | run |
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* `-----------------------------------------------------------'
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* 63 62 17 16 15 0
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*/
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/* All this stuff takes and returns bytes */
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#define SM_RUN_DECODE(x) (BF64_DECODE(x, 0, 15) + 1)
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#define SM_RUN_ENCODE(x) BF64_ENCODE((x) - 1, 0, 15)
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#define SM_TYPE_DECODE(x) BF64_DECODE(x, 15, 1)
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#define SM_TYPE_ENCODE(x) BF64_ENCODE(x, 15, 1)
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#define SM_OFFSET_DECODE(x) BF64_DECODE(x, 16, 47)
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#define SM_OFFSET_ENCODE(x) BF64_ENCODE(x, 16, 47)
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#define SM_DEBUG_DECODE(x) BF64_DECODE(x, 63, 1)
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#define SM_DEBUG_ENCODE(x) BF64_ENCODE(x, 63, 1)
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#define SM_DEBUG_ACTION_DECODE(x) BF64_DECODE(x, 60, 3)
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#define SM_DEBUG_ACTION_ENCODE(x) BF64_ENCODE(x, 60, 3)
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#define SM_DEBUG_SYNCPASS_DECODE(x) BF64_DECODE(x, 50, 10)
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#define SM_DEBUG_SYNCPASS_ENCODE(x) BF64_ENCODE(x, 50, 10)
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#define SM_DEBUG_TXG_DECODE(x) BF64_DECODE(x, 0, 50)
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#define SM_DEBUG_TXG_ENCODE(x) BF64_ENCODE(x, 0, 50)
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#define SM_RUN_MAX SM_RUN_DECODE(~0ULL)
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#define SM_ALLOC 0x0
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#define SM_FREE 0x1
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/*
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* The data for a given space map can be kept on blocks of any size.
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* Larger blocks entail fewer i/o operations, but they also cause the
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* DMU to keep more data in-core, and also to waste more i/o bandwidth
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* when only a few blocks have changed since the last transaction group.
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* This could use a lot more research, but for now, set the freelist
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* block size to 4k (2^12).
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*/
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#define SPACE_MAP_BLOCKSHIFT 12
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typedef void space_map_func_t(space_map_t *sm, uint64_t start, uint64_t size);
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extern void space_map_init(void);
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extern void space_map_fini(void);
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extern void space_map_create(space_map_t *sm, uint64_t start, uint64_t size,
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uint8_t shift, kmutex_t *lp);
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extern void space_map_destroy(space_map_t *sm);
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extern void space_map_add(space_map_t *sm, uint64_t start, uint64_t size);
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extern void space_map_remove(space_map_t *sm, uint64_t start, uint64_t size);
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extern boolean_t space_map_contains(space_map_t *sm,
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uint64_t start, uint64_t size);
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extern space_seg_t *space_map_find(space_map_t *sm, uint64_t start,
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uint64_t size, avl_index_t *wherep);
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extern void space_map_swap(space_map_t **msrc, space_map_t **mdest);
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extern void space_map_vacate(space_map_t *sm,
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space_map_func_t *func, space_map_t *mdest);
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extern void space_map_walk(space_map_t *sm,
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space_map_func_t *func, space_map_t *mdest);
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extern void space_map_load_wait(space_map_t *sm);
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extern int space_map_load(space_map_t *sm, space_map_ops_t *ops,
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uint8_t maptype, space_map_obj_t *smo, objset_t *os);
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extern void space_map_unload(space_map_t *sm);
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extern uint64_t space_map_alloc(space_map_t *sm, uint64_t size);
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extern void space_map_claim(space_map_t *sm, uint64_t start, uint64_t size);
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extern void space_map_free(space_map_t *sm, uint64_t start, uint64_t size);
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extern uint64_t space_map_maxsize(space_map_t *sm);
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extern void space_map_sync(space_map_t *sm, uint8_t maptype,
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space_map_obj_t *smo, objset_t *os, dmu_tx_t *tx);
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extern void space_map_truncate(space_map_obj_t *smo,
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objset_t *os, dmu_tx_t *tx);
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extern void space_map_ref_create(avl_tree_t *t);
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extern void space_map_ref_destroy(avl_tree_t *t);
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extern void space_map_ref_add_seg(avl_tree_t *t,
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uint64_t start, uint64_t end, int64_t refcnt);
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extern void space_map_ref_add_map(avl_tree_t *t,
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space_map_t *sm, int64_t refcnt);
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extern void space_map_ref_generate_map(avl_tree_t *t,
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space_map_t *sm, int64_t minref);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_SPACE_MAP_H */
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