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 https://opensource.org/licenses/CDDL-1.0. 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 * Copyright (c) 2024, Klara, Inc. 23 */ 24 25 #ifndef _SYS_ZVOL_IMPL_H 26 #define _SYS_ZVOL_IMPL_H 27 28 #include <sys/zfs_context.h> 29 30 #define ZVOL_RDONLY (1<<0) /* zvol is readonly (writes rejected) */ 31 #define ZVOL_WRITTEN_TO (1<<1) /* zvol has been written to (needs flush) */ 32 #define ZVOL_EXCL (1<<2) /* zvol has O_EXCL client right now */ 33 #define ZVOL_REMOVING (1<<3) /* zvol waiting to remove minor */ 34 35 /* 36 * The in-core state of each volume. 37 */ 38 typedef struct zvol_state { 39 char zv_name[MAXNAMELEN]; /* name */ 40 uint64_t zv_volsize; /* advertised space */ 41 uint64_t zv_volblocksize; /* volume block size */ 42 objset_t *zv_objset; /* objset handle */ 43 uint32_t zv_flags; /* ZVOL_* flags */ 44 uint32_t zv_open_count; /* open counts */ 45 uint32_t zv_changed; /* disk changed */ 46 uint32_t zv_volmode; /* volmode */ 47 zilog_t *zv_zilog; /* ZIL handle */ 48 zfs_rangelock_t zv_rangelock; /* for range locking */ 49 dnode_t *zv_dn; /* dnode hold */ 50 dataset_kstats_t zv_kstat; /* zvol kstats */ 51 list_node_t zv_next; /* next zvol_state_t linkage */ 52 uint64_t zv_hash; /* name hash */ 53 struct hlist_node zv_hlink; /* hash link */ 54 kmutex_t zv_state_lock; /* protects zvol_state_t */ 55 atomic_t zv_suspend_ref; /* refcount for suspend */ 56 krwlock_t zv_suspend_lock; /* suspend lock */ 57 kcondvar_t zv_removing_cv; /* ready to remove minor */ 58 struct zvol_state_os *zv_zso; /* private platform state */ 59 boolean_t zv_threading; /* volthreading property */ 60 } zvol_state_t; 61 62 63 extern krwlock_t zvol_state_lock; 64 #define ZVOL_HT_SIZE 1024 65 extern struct hlist_head *zvol_htable; 66 #define ZVOL_HT_HEAD(hash) (&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)]) 67 extern zil_replay_func_t *const zvol_replay_vector[TX_MAX_TYPE]; 68 69 extern unsigned int zvol_volmode; 70 extern unsigned int zvol_inhibit_dev; 71 72 /* 73 * platform independent functions exported to platform code 74 */ 75 zvol_state_t *zvol_find_by_name_hash(const char *name, 76 uint64_t hash, int mode); 77 int zvol_first_open(zvol_state_t *zv, boolean_t readonly); 78 uint64_t zvol_name_hash(const char *name); 79 void zvol_remove_minors_impl(const char *name); 80 void zvol_last_close(zvol_state_t *zv); 81 void zvol_insert(zvol_state_t *zv); 82 void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, 83 uint64_t len); 84 void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset, 85 uint64_t size, boolean_t commit); 86 int zvol_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf, 87 struct lwb *lwb, zio_t *zio); 88 int zvol_init_impl(void); 89 void zvol_fini_impl(void); 90 void zvol_wait_close(zvol_state_t *zv); 91 92 /* 93 * platform dependent functions exported to platform independent code 94 */ 95 void zvol_os_free(zvol_state_t *zv); 96 void zvol_os_rename_minor(zvol_state_t *zv, const char *newname); 97 int zvol_os_create_minor(const char *name); 98 int zvol_os_update_volsize(zvol_state_t *zv, uint64_t volsize); 99 boolean_t zvol_os_is_zvol(const char *path); 100 void zvol_os_clear_private(zvol_state_t *zv); 101 void zvol_os_set_disk_ro(zvol_state_t *zv, int flags); 102 void zvol_os_set_capacity(zvol_state_t *zv, uint64_t capacity); 103 104 #endif 105