109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
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/*
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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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#ifndef _SYS_ZVOL_IMPL_H
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#define _SYS_ZVOL_IMPL_H
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#include <sys/zfs_context.h>
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#define ZVOL_RDONLY 0x1
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/*
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* Whether the zvol has been written to (as opposed to ZVOL_RDONLY, which
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* specifies whether or not the zvol _can_ be written to)
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*/
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#define ZVOL_WRITTEN_TO 0x2
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#define ZVOL_DUMPIFIED 0x4
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#define ZVOL_EXCL 0x8
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/*
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* The in-core state of each volume.
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*/
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typedef struct zvol_state {
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char zv_name[MAXNAMELEN]; /* name */
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uint64_t zv_volsize; /* advertised space */
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uint64_t zv_volblocksize; /* volume block size */
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objset_t *zv_objset; /* objset handle */
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uint32_t zv_flags; /* ZVOL_* flags */
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uint32_t zv_open_count; /* open counts */
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uint32_t zv_changed; /* disk changed */
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zilog_t *zv_zilog; /* ZIL handle */
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zfs_rangelock_t zv_rangelock; /* for range locking */
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dnode_t *zv_dn; /* dnode hold */
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dataset_kstats_t zv_kstat; /* zvol kstats */
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list_node_t zv_next; /* next zvol_state_t linkage */
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uint64_t zv_hash; /* name hash */
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struct hlist_node zv_hlink; /* hash link */
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kmutex_t zv_state_lock; /* protects zvol_state_t */
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atomic_t zv_suspend_ref; /* refcount for suspend */
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krwlock_t zv_suspend_lock; /* suspend lock */
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struct zvol_state_os *zv_zso; /* private platform state */
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} zvol_state_t;
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extern list_t zvol_state_list;
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extern krwlock_t zvol_state_lock;
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#define ZVOL_HT_SIZE 1024
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extern struct hlist_head *zvol_htable;
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#define ZVOL_HT_HEAD(hash) (&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)])
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extern zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE];
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extern unsigned int zvol_volmode;
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extern unsigned int zvol_inhibit_dev;
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/*
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* platform independent functions exported to platform code
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*/
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zvol_state_t *zvol_find_by_name_hash(const char *name,
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uint64_t hash, int mode);
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int zvol_first_open(zvol_state_t *zv, boolean_t readonly);
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uint64_t zvol_name_hash(const char *name);
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void zvol_remove_minors_impl(const char *name);
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void zvol_last_close(zvol_state_t *zv);
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void zvol_insert(zvol_state_t *zv);
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void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
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uint64_t len, boolean_t sync);
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void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset,
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uint64_t size, int sync);
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int zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb,
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zio_t *zio);
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int zvol_init_impl(void);
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void zvol_fini_impl(void);
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/*
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* platform dependent functions exported to platform independent code
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*/
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typedef struct zvol_platform_ops {
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void (*zv_free)(zvol_state_t *);
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void (*zv_rename_minor)(zvol_state_t *, const char *);
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int (*zv_create_minor)(const char *);
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int (*zv_update_volsize)(zvol_state_t *, uint64_t);
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boolean_t (*zv_is_zvol)(const char *);
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void (*zv_clear_private)(zvol_state_t *);
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void (*zv_set_disk_ro)(zvol_state_t *, int flags);
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void (*zv_set_capacity)(zvol_state_t *, uint64_t capacity);
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} zvol_platform_ops_t;
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void zvol_register_ops(const zvol_platform_ops_t *ops);
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#endif
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