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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
#ifndef _SYS_ZVOL_IMPL_H
#define _SYS_ZVOL_IMPL_H
#include <sys/zfs_context.h>
#define ZVOL_RDONLY 0x1
/*
* Whether the zvol has been written to (as opposed to ZVOL_RDONLY, which
* specifies whether or not the zvol _can_ be written to)
*/
#define ZVOL_WRITTEN_TO 0x2
#define ZVOL_DUMPIFIED 0x4
#define ZVOL_EXCL 0x8
/*
* The in-core state of each volume.
*/
typedef struct zvol_state {
char zv_name[MAXNAMELEN]; /* name */
uint64_t zv_volsize; /* advertised space */
uint64_t zv_volblocksize; /* volume block size */
objset_t *zv_objset; /* objset handle */
uint32_t zv_flags; /* ZVOL_* flags */
uint32_t zv_open_count; /* open counts */
uint32_t zv_changed; /* disk changed */
zilog_t *zv_zilog; /* ZIL handle */
zfs_rangelock_t zv_rangelock; /* for range locking */
dnode_t *zv_dn; /* dnode hold */
list_node_t zv_next; /* next zvol_state_t linkage */
uint64_t zv_hash; /* name hash */
struct hlist_node zv_hlink; /* hash link */
kmutex_t zv_state_lock; /* protects zvol_state_t */
atomic_t zv_suspend_ref; /* refcount for suspend */
krwlock_t zv_suspend_lock; /* suspend lock */
struct zvol_state_os *zv_zso; /* private platform state */
} zvol_state_t;
extern list_t zvol_state_list;
extern krwlock_t zvol_state_lock;
#define ZVOL_HT_SIZE 1024
extern struct hlist_head *zvol_htable;
#define ZVOL_HT_HEAD(hash) (&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)])
extern zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE];
extern unsigned int zvol_volmode;
extern unsigned int zvol_inhibit_dev;
/*
* platform independent functions exported to platform code
*/
zvol_state_t *zvol_find_by_name_hash(const char *name,
uint64_t hash, int mode);
int zvol_first_open(zvol_state_t *zv, boolean_t readonly);
uint64_t zvol_name_hash(const char *name);
void zvol_remove_minors_impl(const char *name);
void zvol_last_close(zvol_state_t *zv);
void zvol_insert(zvol_state_t *zv);
void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
uint64_t len, boolean_t sync);
void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset,
uint64_t size, int sync);
int zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb,
zio_t *zio);
int zvol_init_impl(void);
void zvol_fini_impl(void);
/*
* platform dependent functions exported to platform independent code
*/
typedef struct zvol_platform_ops {
void (*zv_free)(zvol_state_t *);
void (*zv_rename_minor)(zvol_state_t *, const char *);
int (*zv_create_minor)(const char *);
int (*zv_update_volsize)(zvol_state_t *, uint64_t);
boolean_t (*zv_is_zvol)(const char *);
void (*zv_clear_private)(zvol_state_t *);
void (*zv_set_disk_ro)(zvol_state_t *, int flags);
void (*zv_set_capacity)(zvol_state_t *, uint64_t capacity);
} zvol_platform_ops_t;
void zvol_register_ops(const zvol_platform_ops_t *ops);
#endif
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