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 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 list_t zvol_state_list; 65 extern krwlock_t zvol_state_lock; 66 #define ZVOL_HT_SIZE 1024 67 extern struct hlist_head *zvol_htable; 68 #define ZVOL_HT_HEAD(hash) (&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)]) 69 extern zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE]; 70 71 extern unsigned int zvol_volmode; 72 extern unsigned int zvol_inhibit_dev; 73 74 /* 75 * platform independent functions exported to platform code 76 */ 77 zvol_state_t *zvol_find_by_name_hash(const char *name, 78 uint64_t hash, int mode); 79 int zvol_first_open(zvol_state_t *zv, boolean_t readonly); 80 uint64_t zvol_name_hash(const char *name); 81 void zvol_remove_minors_impl(const char *name); 82 void zvol_last_close(zvol_state_t *zv); 83 void zvol_insert(zvol_state_t *zv); 84 void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, 85 uint64_t len, boolean_t sync); 86 void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset, 87 uint64_t size, int sync); 88 int zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, 89 zio_t *zio); 90 int zvol_init_impl(void); 91 void zvol_fini_impl(void); 92 void zvol_wait_close(zvol_state_t *zv); 93 94 /* 95 * platform dependent functions exported to platform independent code 96 */ 97 typedef struct zvol_platform_ops { 98 void (*zv_free)(zvol_state_t *); 99 void (*zv_rename_minor)(zvol_state_t *, const char *); 100 int (*zv_create_minor)(const char *); 101 int (*zv_update_volsize)(zvol_state_t *, uint64_t); 102 boolean_t (*zv_is_zvol)(const char *); 103 void (*zv_clear_private)(zvol_state_t *); 104 void (*zv_set_disk_ro)(zvol_state_t *, int flags); 105 void (*zv_set_capacity)(zvol_state_t *, uint64_t capacity); 106 } zvol_platform_ops_t; 107 108 void zvol_register_ops(const zvol_platform_ops_t *ops); 109 110 #endif 111