FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/include/sys/zvol_impl.h

     /*
      * 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 https://opensource.org/licenses/CDDL-1.0.
     * 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 */
            uint32_t                zv_volmode;     /* volmode */
            zilog_t                 *zv_zilog;      /* ZIL handle */
            zfs_rangelock_t         zv_rangelock;   /* for range locking */
            dnode_t                 *zv_dn;         /* dnode hold */
            dataset_kstats_t        zv_kstat;       /* zvol kstats */
            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 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 *const 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, uint64_t arg2, lr_write_t *lr, char *buf,
        struct lwb *lwb, zio_t *zio);
    int zvol_init_impl(void);
    void zvol_fini_impl(void);
    void zvol_wait_close(zvol_state_t *zv);
    
    /*
     * platform dependent functions exported to platform independent code
     */
    void zvol_os_free(zvol_state_t *zv);
    void zvol_os_rename_minor(zvol_state_t *zv, const char *newname);
    int zvol_os_create_minor(const char *name);
    int zvol_os_update_volsize(zvol_state_t *zv, uint64_t volsize);
   boolean_t zvol_os_is_zvol(const char *path);
   void zvol_os_clear_private(zvol_state_t *zv);
   void zvol_os_set_disk_ro(zvol_state_t *zv, int flags);
   void zvol_os_set_capacity(zvol_state_t *zv, uint64_t capacity);
   
   #endif

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