1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22#ifndef	_SYS_ZVOL_IMPL_H
23#define	_SYS_ZVOL_IMPL_H
24
25#include <sys/zfs_context.h>
26
27#define	ZVOL_RDONLY	0x1
28/*
29 * Whether the zvol has been written to (as opposed to ZVOL_RDONLY, which
30 * specifies whether or not the zvol _can_ be written to)
31 */
32#define	ZVOL_WRITTEN_TO	0x2
33
34#define	ZVOL_DUMPIFIED	0x4
35
36#define	ZVOL_EXCL	0x8
37
38/*
39 * The in-core state of each volume.
40 */
41typedef struct zvol_state {
42	char			zv_name[MAXNAMELEN];	/* name */
43	uint64_t		zv_volsize;		/* advertised space */
44	uint64_t		zv_volblocksize;	/* volume block size */
45	objset_t		*zv_objset;	/* objset handle */
46	uint32_t		zv_flags;	/* ZVOL_* flags */
47	uint32_t		zv_open_count;	/* open counts */
48	uint32_t		zv_changed;	/* disk changed */
49	uint32_t		zv_volmode;	/* volmode */
50	zilog_t			*zv_zilog;	/* ZIL handle */
51	zfs_rangelock_t		zv_rangelock;	/* for range locking */
52	dnode_t			*zv_dn;		/* dnode hold */
53	dataset_kstats_t	zv_kstat;	/* zvol kstats */
54	list_node_t		zv_next;	/* next zvol_state_t linkage */
55	uint64_t		zv_hash;	/* name hash */
56	struct hlist_node	zv_hlink;	/* hash link */
57	kmutex_t		zv_state_lock;	/* protects zvol_state_t */
58	atomic_t		zv_suspend_ref;	/* refcount for suspend */
59	krwlock_t		zv_suspend_lock;	/* suspend lock */
60	struct zvol_state_os	*zv_zso;	/* private platform state */
61} zvol_state_t;
62
63
64extern list_t zvol_state_list;
65extern krwlock_t zvol_state_lock;
66#define	ZVOL_HT_SIZE	1024
67extern struct hlist_head *zvol_htable;
68#define	ZVOL_HT_HEAD(hash)	(&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)])
69extern zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE];
70
71extern unsigned int zvol_volmode;
72extern unsigned int zvol_inhibit_dev;
73
74/*
75 * platform independent functions exported to platform code
76 */
77zvol_state_t *zvol_find_by_name_hash(const char *name,
78    uint64_t hash, int mode);
79int zvol_first_open(zvol_state_t *zv, boolean_t readonly);
80uint64_t zvol_name_hash(const char *name);
81void zvol_remove_minors_impl(const char *name);
82void zvol_last_close(zvol_state_t *zv);
83void zvol_insert(zvol_state_t *zv);
84void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
85    uint64_t len, boolean_t sync);
86void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset,
87    uint64_t size, int sync);
88int zvol_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf,
89    struct lwb *lwb, zio_t *zio);
90int zvol_init_impl(void);
91void zvol_fini_impl(void);
92void zvol_wait_close(zvol_state_t *zv);
93
94/*
95 * platform dependent functions exported to platform independent code
96 */
97typedef struct zvol_platform_ops {
98	void (*zv_free)(zvol_state_t *);
99	void (*zv_rename_minor)(zvol_state_t *, const char *);
100	int (*zv_create_minor)(const char *);
101	int (*zv_update_volsize)(zvol_state_t *, uint64_t);
102	boolean_t (*zv_is_zvol)(const char *);
103	void (*zv_clear_private)(zvol_state_t *);
104	void (*zv_set_disk_ro)(zvol_state_t *, int flags);
105	void (*zv_set_capacity)(zvol_state_t *, uint64_t capacity);
106} zvol_platform_ops_t;
107
108void zvol_register_ops(const zvol_platform_ops_t *ops);
109
110#endif
111