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 https://opensource.org/licenses/CDDL-1.0.
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  */
41 typedef 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 
64 extern krwlock_t zvol_state_lock;
65 #define	ZVOL_HT_SIZE	1024
66 extern struct hlist_head *zvol_htable;
67 #define	ZVOL_HT_HEAD(hash)	(&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)])
68 extern zil_replay_func_t *const zvol_replay_vector[TX_MAX_TYPE];
69 
70 extern unsigned int zvol_volmode;
71 extern unsigned int zvol_inhibit_dev;
72 
73 /*
74  * platform independent functions exported to platform code
75  */
76 zvol_state_t *zvol_find_by_name_hash(const char *name,
77     uint64_t hash, int mode);
78 int zvol_first_open(zvol_state_t *zv, boolean_t readonly);
79 uint64_t zvol_name_hash(const char *name);
80 void zvol_remove_minors_impl(const char *name);
81 void zvol_last_close(zvol_state_t *zv);
82 void zvol_insert(zvol_state_t *zv);
83 void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
84     uint64_t len, boolean_t sync);
85 void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset,
86     uint64_t size, int sync);
87 int zvol_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf,
88     struct lwb *lwb, zio_t *zio);
89 int zvol_init_impl(void);
90 void zvol_fini_impl(void);
91 void zvol_wait_close(zvol_state_t *zv);
92 
93 /*
94  * platform dependent functions exported to platform independent code
95  */
96 void zvol_os_free(zvol_state_t *zv);
97 void zvol_os_rename_minor(zvol_state_t *zv, const char *newname);
98 int zvol_os_create_minor(const char *name);
99 int zvol_os_update_volsize(zvol_state_t *zv, uint64_t volsize);
100 boolean_t zvol_os_is_zvol(const char *path);
101 void zvol_os_clear_private(zvol_state_t *zv);
102 void zvol_os_set_disk_ro(zvol_state_t *zv, int flags);
103 void zvol_os_set_capacity(zvol_state_t *zv, uint64_t capacity);
104 
105 #endif
106