include/sys/zvol_impl.h

   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  */
  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         zilog_t                 *zv_zilog;      /* ZIL handle */
  50         zfs_rangelock_t         zv_rangelock;   /* for range locking */
  51         dnode_t                 *zv_dn;         /* dnode hold */
  52         dataset_kstats_t        zv_kstat;       /* zvol kstats */
  53         list_node_t             zv_next;        /* next zvol_state_t linkage */
  54         uint64_t                zv_hash;        /* name hash */
  55         struct hlist_node       zv_hlink;       /* hash link */
  56         kmutex_t                zv_state_lock;  /* protects zvol_state_t */
  57         atomic_t                zv_suspend_ref; /* refcount for suspend */
  58         krwlock_t               zv_suspend_lock;        /* suspend lock */
  59         struct zvol_state_os    *zv_zso;        /* private platform state */
  60 } zvol_state_t;
  61
  62
  63 extern list_t zvol_state_list;
  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 *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, lr_write_t *lr, char *buf, struct lwb *lwb,
  88     zio_t *zio);
  89 int zvol_init_impl(void);
  90 void zvol_fini_impl(void);
  91
  92 /*
  93  * platform dependent functions exported to platform independent code
  94  */
  95 typedef struct zvol_platform_ops {
  96         void (*zv_free)(zvol_state_t *);
  97         void (*zv_rename_minor)(zvol_state_t *, const char *);
  98         int (*zv_create_minor)(const char *);
  99         int (*zv_update_volsize)(zvol_state_t *, uint64_t);
 100         boolean_t (*zv_is_zvol)(const char *);
 101         void (*zv_clear_private)(zvol_state_t *);
 102         void (*zv_set_disk_ro)(zvol_state_t *, int flags);
 103         void (*zv_set_capacity)(zvol_state_t *, uint64_t capacity);
 104 } zvol_platform_ops_t;
 105
 106 void zvol_register_ops(const zvol_platform_ops_t *ops);
 107
 108 #endif