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+/*
+ * 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 http://www.opensolaris.org/os/licensing.
+ * 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
+ */
+/*
+ * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#ifndef _SYS_VDEV_IMPL_H
+#define _SYS_VDEV_IMPL_H
+
+#include <sys/avl.h>
+#include <sys/dmu.h>
+#include <sys/metaslab.h>
+#include <sys/nvpair.h>
+#include <sys/space_map.h>
+#include <sys/vdev.h>
+#include <sys/dkio.h>
+#include <sys/uberblock_impl.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Virtual device descriptors.
+ *
+ * All storage pool operations go through the virtual device framework,
+ * which provides data replication and I/O scheduling.
+ */
+
+/*
+ * Forward declarations that lots of things need.
+ */
+typedef struct vdev_queue vdev_queue_t;
+typedef struct vdev_cache vdev_cache_t;
+typedef struct vdev_cache_entry vdev_cache_entry_t;
+
+/*
+ * Virtual device operations
+ */
+typedef int vdev_open_func_t(vdev_t *vd, uint64_t *size, uint64_t *ashift);
+typedef void vdev_close_func_t(vdev_t *vd);
+typedef uint64_t vdev_asize_func_t(vdev_t *vd, uint64_t psize);
+typedef int vdev_io_start_func_t(zio_t *zio);
+typedef void vdev_io_done_func_t(zio_t *zio);
+typedef void vdev_state_change_func_t(vdev_t *vd, int, int);
+typedef void vdev_hold_func_t(vdev_t *vd);
+typedef void vdev_rele_func_t(vdev_t *vd);
+
+typedef struct vdev_ops {
+ vdev_open_func_t *vdev_op_open;
+ vdev_close_func_t *vdev_op_close;
+ vdev_asize_func_t *vdev_op_asize;
+ vdev_io_start_func_t *vdev_op_io_start;
+ vdev_io_done_func_t *vdev_op_io_done;
+ vdev_state_change_func_t *vdev_op_state_change;
+ vdev_hold_func_t *vdev_op_hold;
+ vdev_rele_func_t *vdev_op_rele;
+ char vdev_op_type[16];
+ boolean_t vdev_op_leaf;
+} vdev_ops_t;
+
+/*
+ * Virtual device properties
+ */
+struct vdev_cache_entry {
+ char *ve_data;
+ uint64_t ve_offset;
+ uint64_t ve_lastused;
+ avl_node_t ve_offset_node;
+ avl_node_t ve_lastused_node;
+ uint32_t ve_hits;
+ uint16_t ve_missed_update;
+ zio_t *ve_fill_io;
+};
+
+struct vdev_cache {
+ avl_tree_t vc_offset_tree;
+ avl_tree_t vc_lastused_tree;
+ kmutex_t vc_lock;
+};
+
+struct vdev_queue {
+ avl_tree_t vq_deadline_tree;
+ avl_tree_t vq_read_tree;
+ avl_tree_t vq_write_tree;
+ avl_tree_t vq_pending_tree;
+ kmutex_t vq_lock;
+};
+
+/*
+ * Virtual device descriptor
+ */
+struct vdev {
+ /*
+ * Common to all vdev types.
+ */
+ uint64_t vdev_id; /* child number in vdev parent */
+ uint64_t vdev_guid; /* unique ID for this vdev */
+ uint64_t vdev_guid_sum; /* self guid + all child guids */
+ uint64_t vdev_orig_guid; /* orig. guid prior to remove */
+ uint64_t vdev_asize; /* allocatable device capacity */
+ uint64_t vdev_min_asize; /* min acceptable asize */
+ uint64_t vdev_ashift; /* block alignment shift */
+ uint64_t vdev_state; /* see VDEV_STATE_* #defines */
+ uint64_t vdev_prevstate; /* used when reopening a vdev */
+ vdev_ops_t *vdev_ops; /* vdev operations */
+ spa_t *vdev_spa; /* spa for this vdev */
+ void *vdev_tsd; /* type-specific data */
+ vnode_t *vdev_name_vp; /* vnode for pathname */
+ vnode_t *vdev_devid_vp; /* vnode for devid */
+ vdev_t *vdev_top; /* top-level vdev */
+ vdev_t *vdev_parent; /* parent vdev */
+ vdev_t **vdev_child; /* array of children */
+ uint64_t vdev_children; /* number of children */
+ space_map_t vdev_dtl[DTL_TYPES]; /* in-core dirty time logs */
+ vdev_stat_t vdev_stat; /* virtual device statistics */
+ boolean_t vdev_expanding; /* expand the vdev? */
+ boolean_t vdev_reopening; /* reopen in progress? */
+ int vdev_open_error; /* error on last open */
+ kthread_t *vdev_open_thread; /* thread opening children */
+ uint64_t vdev_crtxg; /* txg when top-level was added */
+
+ /*
+ * Top-level vdev state.
+ */
+ uint64_t vdev_ms_array; /* metaslab array object */
+ uint64_t vdev_ms_shift; /* metaslab size shift */
+ uint64_t vdev_ms_count; /* number of metaslabs */
+ metaslab_group_t *vdev_mg; /* metaslab group */
+ metaslab_t **vdev_ms; /* metaslab array */
+ txg_list_t vdev_ms_list; /* per-txg dirty metaslab lists */
+ txg_list_t vdev_dtl_list; /* per-txg dirty DTL lists */
+ txg_node_t vdev_txg_node; /* per-txg dirty vdev linkage */
+ boolean_t vdev_remove_wanted; /* async remove wanted? */
+ boolean_t vdev_probe_wanted; /* async probe wanted? */
+ uint64_t vdev_removing; /* device is being removed? */
+ list_node_t vdev_config_dirty_node; /* config dirty list */
+ list_node_t vdev_state_dirty_node; /* state dirty list */
+ uint64_t vdev_deflate_ratio; /* deflation ratio (x512) */
+ uint64_t vdev_islog; /* is an intent log device */
+ uint64_t vdev_ishole; /* is a hole in the namespace */
+
+ /*
+ * Leaf vdev state.
+ */
+ uint64_t vdev_psize; /* physical device capacity */
+ space_map_obj_t vdev_dtl_smo; /* dirty time log space map obj */
+ txg_node_t vdev_dtl_node; /* per-txg dirty DTL linkage */
+ uint64_t vdev_wholedisk; /* true if this is a whole disk */
+ uint64_t vdev_offline; /* persistent offline state */
+ uint64_t vdev_faulted; /* persistent faulted state */
+ uint64_t vdev_degraded; /* persistent degraded state */
+ uint64_t vdev_removed; /* persistent removed state */
+ uint64_t vdev_resilvering; /* persistent resilvering state */
+ uint64_t vdev_nparity; /* number of parity devices for raidz */
+ char *vdev_path; /* vdev path (if any) */
+ char *vdev_devid; /* vdev devid (if any) */
+ char *vdev_physpath; /* vdev device path (if any) */
+ char *vdev_fru; /* physical FRU location */
+ uint64_t vdev_not_present; /* not present during import */
+ uint64_t vdev_unspare; /* unspare when resilvering done */
+ hrtime_t vdev_last_try; /* last reopen time */
+ boolean_t vdev_nowritecache; /* true if flushwritecache failed */
+ boolean_t vdev_checkremove; /* temporary online test */
+ boolean_t vdev_forcefault; /* force online fault */
+ boolean_t vdev_splitting; /* split or repair in progress */
+ boolean_t vdev_delayed_close; /* delayed device close? */
+ uint8_t vdev_tmpoffline; /* device taken offline temporarily? */
+ uint8_t vdev_detached; /* device detached? */
+ uint8_t vdev_cant_read; /* vdev is failing all reads */
+ uint8_t vdev_cant_write; /* vdev is failing all writes */
+ uint64_t vdev_isspare; /* was a hot spare */
+ uint64_t vdev_isl2cache; /* was a l2cache device */
+ vdev_queue_t vdev_queue; /* I/O deadline schedule queue */
+ vdev_cache_t vdev_cache; /* physical block cache */
+ spa_aux_vdev_t *vdev_aux; /* for l2cache vdevs */
+ zio_t *vdev_probe_zio; /* root of current probe */
+ vdev_aux_t vdev_label_aux; /* on-disk aux state */
+
+ /*
+ * For DTrace to work in userland (libzpool) context, these fields must
+ * remain at the end of the structure. DTrace will use the kernel's
+ * CTF definition for 'struct vdev', and since the size of a kmutex_t is
+ * larger in userland, the offsets for the rest fields would be
+ * incorrect.
+ */
+ kmutex_t vdev_dtl_lock; /* vdev_dtl_{map,resilver} */
+ kmutex_t vdev_stat_lock; /* vdev_stat */
+ kmutex_t vdev_probe_lock; /* protects vdev_probe_zio */
+};
+
+#define VDEV_RAIDZ_MAXPARITY 3
+
+#define VDEV_PAD_SIZE (8 << 10)
+/* 2 padding areas (vl_pad1 and vl_pad2) to skip */
+#define VDEV_SKIP_SIZE VDEV_PAD_SIZE * 2
+#define VDEV_PHYS_SIZE (112 << 10)
+#define VDEV_UBERBLOCK_RING (128 << 10)
+
+#define VDEV_UBERBLOCK_SHIFT(vd) \
+ MAX((vd)->vdev_top->vdev_ashift, UBERBLOCK_SHIFT)
+#define VDEV_UBERBLOCK_COUNT(vd) \
+ (VDEV_UBERBLOCK_RING >> VDEV_UBERBLOCK_SHIFT(vd))
+#define VDEV_UBERBLOCK_OFFSET(vd, n) \
+ offsetof(vdev_label_t, vl_uberblock[(n) << VDEV_UBERBLOCK_SHIFT(vd)])
+#define VDEV_UBERBLOCK_SIZE(vd) (1ULL << VDEV_UBERBLOCK_SHIFT(vd))
+
+typedef struct vdev_phys {
+ char vp_nvlist[VDEV_PHYS_SIZE - sizeof (zio_eck_t)];
+ zio_eck_t vp_zbt;
+} vdev_phys_t;
+
+typedef struct vdev_label {
+ char vl_pad1[VDEV_PAD_SIZE]; /* 8K */
+ char vl_pad2[VDEV_PAD_SIZE]; /* 8K */
+ vdev_phys_t vl_vdev_phys; /* 112K */
+ char vl_uberblock[VDEV_UBERBLOCK_RING]; /* 128K */
+} vdev_label_t; /* 256K total */
+
+/*
+ * vdev_dirty() flags
+ */
+#define VDD_METASLAB 0x01
+#define VDD_DTL 0x02
+
+/*
+ * Size and offset of embedded boot loader region on each label.
+ * The total size of the first two labels plus the boot area is 4MB.
+ */
+#define VDEV_BOOT_OFFSET (2 * sizeof (vdev_label_t))
+#define VDEV_BOOT_SIZE (7ULL << 19) /* 3.5M */
+
+/*
+ * Size of label regions at the start and end of each leaf device.
+ */
+#define VDEV_LABEL_START_SIZE (2 * sizeof (vdev_label_t) + VDEV_BOOT_SIZE)
+#define VDEV_LABEL_END_SIZE (2 * sizeof (vdev_label_t))
+#define VDEV_LABELS 4
+
+#define VDEV_ALLOC_LOAD 0
+#define VDEV_ALLOC_ADD 1
+#define VDEV_ALLOC_SPARE 2
+#define VDEV_ALLOC_L2CACHE 3
+#define VDEV_ALLOC_ROOTPOOL 4
+#define VDEV_ALLOC_SPLIT 5
+
+/*
+ * Allocate or free a vdev
+ */
+extern vdev_t *vdev_alloc_common(spa_t *spa, uint_t id, uint64_t guid,
+ vdev_ops_t *ops);
+extern int vdev_alloc(spa_t *spa, vdev_t **vdp, nvlist_t *config,
+ vdev_t *parent, uint_t id, int alloctype);
+extern void vdev_free(vdev_t *vd);
+
+/*
+ * Add or remove children and parents
+ */
+extern void vdev_add_child(vdev_t *pvd, vdev_t *cvd);
+extern void vdev_remove_child(vdev_t *pvd, vdev_t *cvd);
+extern void vdev_compact_children(vdev_t *pvd);
+extern vdev_t *vdev_add_parent(vdev_t *cvd, vdev_ops_t *ops);
+extern void vdev_remove_parent(vdev_t *cvd);
+
+/*
+ * vdev sync load and sync
+ */
+extern void vdev_load_log_state(vdev_t *nvd, vdev_t *ovd);
+extern boolean_t vdev_log_state_valid(vdev_t *vd);
+extern void vdev_load(vdev_t *vd);
+extern void vdev_sync(vdev_t *vd, uint64_t txg);
+extern void vdev_sync_done(vdev_t *vd, uint64_t txg);
+extern void vdev_dirty(vdev_t *vd, int flags, void *arg, uint64_t txg);
+
+/*
+ * Available vdev types.
+ */
+extern vdev_ops_t vdev_root_ops;
+extern vdev_ops_t vdev_mirror_ops;
+extern vdev_ops_t vdev_replacing_ops;
+extern vdev_ops_t vdev_raidz_ops;
+extern vdev_ops_t vdev_disk_ops;
+extern vdev_ops_t vdev_file_ops;
+extern vdev_ops_t vdev_missing_ops;
+extern vdev_ops_t vdev_hole_ops;
+extern vdev_ops_t vdev_spare_ops;
+
+/*
+ * Common size functions
+ */
+extern uint64_t vdev_default_asize(vdev_t *vd, uint64_t psize);
+extern uint64_t vdev_get_min_asize(vdev_t *vd);
+extern void vdev_set_min_asize(vdev_t *vd);
+
+/*
+ * zdb uses this tunable, so it must be declared here to make lint happy.
+ */
+extern int zfs_vdev_cache_size;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_VDEV_IMPL_H */