Support custom build directories and move includes

One of the neat tricks an autoconf style project is capable of
is allow configurion/building in a directory other than the
source directory.  The major advantage to this is that you can
build the project various different ways while making changes
in a single source tree.

For example, this project is designed to work on various different
Linux distributions each of which work slightly differently.  This
means that changes need to verified on each of those supported
distributions perferably before the change is committed to the
public git repo.

Using nfs and custom build directories makes this much easier.
I now have a single source tree in nfs mounted on several different
systems each running a supported distribution.  When I make a
change to the source base I suspect may break things I can
concurrently build from the same source on all the systems each
in their own subdirectory.

wget -c http://github.com/downloads/behlendorf/zfs/zfs-x.y.z.tar.gz
tar -xzf zfs-x.y.z.tar.gz
cd zfs-x-y-z

------------------------- run concurrently ----------------------
<ubuntu system>  <fedora system>  <debian system>  <rhel6 system>
mkdir ubuntu     mkdir fedora     mkdir debian     mkdir rhel6
cd ubuntu        cd fedora        cd debian        cd rhel6
../configure     ../configure     ../configure     ../configure
make             make             make             make
make check       make check       make check       make check

This change also moves many of the include headers from individual
incude/sys directories under the modules directory in to a single
top level include directory.  This has the advantage of making
the build rules cleaner and logically it makes a bit more sense.

1 files changed, 559 insertions, 0 deletions

diff --git a/include/sys/zio.h b/include/sys/zio.h
new file mode 100644
index 000000000..97d8ec74d
--- /dev/null
+++ b/include/sys/zio.h
@@ -0,0 +1,559 @@
+/*
+ * 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 _ZIO_H
+#define	_ZIO_H
+
+#include <sys/zfs_context.h>
+#include <sys/spa.h>
+#include <sys/txg.h>
+#include <sys/avl.h>
+#include <sys/fs/zfs.h>
+#include <sys/zio_impl.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * Embedded checksum
+ */
+#define	ZEC_MAGIC	0x210da7ab10c7a11ULL
+
+typedef struct zio_eck {
+	uint64_t	zec_magic;	/* for validation, endianness	*/
+	zio_cksum_t	zec_cksum;	/* 256-bit checksum		*/
+} zio_eck_t;
+
+/*
+ * Gang block headers are self-checksumming and contain an array
+ * of block pointers.
+ */
+#define	SPA_GANGBLOCKSIZE	SPA_MINBLOCKSIZE
+#define	SPA_GBH_NBLKPTRS	((SPA_GANGBLOCKSIZE - \
+	sizeof (zio_eck_t)) / sizeof (blkptr_t))
+#define	SPA_GBH_FILLER		((SPA_GANGBLOCKSIZE - \
+	sizeof (zio_eck_t) - \
+	(SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
+	sizeof (uint64_t))
+
+typedef struct zio_gbh {
+	blkptr_t		zg_blkptr[SPA_GBH_NBLKPTRS];
+	uint64_t		zg_filler[SPA_GBH_FILLER];
+	zio_eck_t		zg_tail;
+} zio_gbh_phys_t;
+
+enum zio_checksum {
+	ZIO_CHECKSUM_INHERIT = 0,
+	ZIO_CHECKSUM_ON,
+	ZIO_CHECKSUM_OFF,
+	ZIO_CHECKSUM_LABEL,
+	ZIO_CHECKSUM_GANG_HEADER,
+	ZIO_CHECKSUM_ZILOG,
+	ZIO_CHECKSUM_FLETCHER_2,
+	ZIO_CHECKSUM_FLETCHER_4,
+	ZIO_CHECKSUM_SHA256,
+	ZIO_CHECKSUM_ZILOG2,
+	ZIO_CHECKSUM_FUNCTIONS
+};
+
+#define	ZIO_CHECKSUM_ON_VALUE	ZIO_CHECKSUM_FLETCHER_4
+#define	ZIO_CHECKSUM_DEFAULT	ZIO_CHECKSUM_ON
+
+#define	ZIO_CHECKSUM_MASK	0xffULL
+#define	ZIO_CHECKSUM_VERIFY	(1 << 8)
+
+#define	ZIO_DEDUPCHECKSUM	ZIO_CHECKSUM_SHA256
+#define	ZIO_DEDUPDITTO_MIN	100
+
+enum zio_compress {
+	ZIO_COMPRESS_INHERIT = 0,
+	ZIO_COMPRESS_ON,
+	ZIO_COMPRESS_OFF,
+	ZIO_COMPRESS_LZJB,
+	ZIO_COMPRESS_EMPTY,
+	ZIO_COMPRESS_GZIP_1,
+	ZIO_COMPRESS_GZIP_2,
+	ZIO_COMPRESS_GZIP_3,
+	ZIO_COMPRESS_GZIP_4,
+	ZIO_COMPRESS_GZIP_5,
+	ZIO_COMPRESS_GZIP_6,
+	ZIO_COMPRESS_GZIP_7,
+	ZIO_COMPRESS_GZIP_8,
+	ZIO_COMPRESS_GZIP_9,
+	ZIO_COMPRESS_ZLE,
+	ZIO_COMPRESS_FUNCTIONS
+};
+
+#define	ZIO_COMPRESS_ON_VALUE	ZIO_COMPRESS_LZJB
+#define	ZIO_COMPRESS_DEFAULT	ZIO_COMPRESS_OFF
+
+#define	BOOTFS_COMPRESS_VALID(compress)			\
+	((compress) == ZIO_COMPRESS_LZJB ||		\
+	((compress) == ZIO_COMPRESS_ON &&		\
+	ZIO_COMPRESS_ON_VALUE == ZIO_COMPRESS_LZJB) ||	\
+	(compress) == ZIO_COMPRESS_OFF)
+
+#define	ZIO_FAILURE_MODE_WAIT		0
+#define	ZIO_FAILURE_MODE_CONTINUE	1
+#define	ZIO_FAILURE_MODE_PANIC		2
+
+#define	ZIO_PRIORITY_NOW		(zio_priority_table[0])
+#define	ZIO_PRIORITY_SYNC_READ		(zio_priority_table[1])
+#define	ZIO_PRIORITY_SYNC_WRITE		(zio_priority_table[2])
+#define	ZIO_PRIORITY_LOG_WRITE		(zio_priority_table[3])
+#define	ZIO_PRIORITY_CACHE_FILL		(zio_priority_table[4])
+#define	ZIO_PRIORITY_AGG		(zio_priority_table[5])
+#define	ZIO_PRIORITY_FREE		(zio_priority_table[6])
+#define	ZIO_PRIORITY_ASYNC_WRITE	(zio_priority_table[7])
+#define	ZIO_PRIORITY_ASYNC_READ		(zio_priority_table[8])
+#define	ZIO_PRIORITY_RESILVER		(zio_priority_table[9])
+#define	ZIO_PRIORITY_SCRUB		(zio_priority_table[10])
+#define	ZIO_PRIORITY_DDT_PREFETCH	(zio_priority_table[11])
+#define	ZIO_PRIORITY_TABLE_SIZE		12
+
+#define	ZIO_PIPELINE_CONTINUE		0x100
+#define	ZIO_PIPELINE_STOP		0x101
+
+enum zio_flag {
+	/*
+	 * Flags inherited by gang, ddt, and vdev children,
+	 * and that must be equal for two zios to aggregate
+	 */
+	ZIO_FLAG_DONT_AGGREGATE	= 1 << 0,
+	ZIO_FLAG_IO_REPAIR	= 1 << 1,
+	ZIO_FLAG_SELF_HEAL	= 1 << 2,
+	ZIO_FLAG_RESILVER	= 1 << 3,
+	ZIO_FLAG_SCRUB		= 1 << 4,
+	ZIO_FLAG_SCAN_THREAD	= 1 << 5,
+
+#define	ZIO_FLAG_AGG_INHERIT	(ZIO_FLAG_CANFAIL - 1)
+
+	/*
+	 * Flags inherited by ddt, gang, and vdev children.
+	 */
+	ZIO_FLAG_CANFAIL	= 1 << 6,	/* must be first for INHERIT */
+	ZIO_FLAG_SPECULATIVE	= 1 << 7,
+	ZIO_FLAG_CONFIG_WRITER	= 1 << 8,
+	ZIO_FLAG_DONT_RETRY	= 1 << 9,
+	ZIO_FLAG_DONT_CACHE	= 1 << 10,
+	ZIO_FLAG_NODATA		= 1 << 11,
+	ZIO_FLAG_INDUCE_DAMAGE	= 1 << 12,
+
+#define	ZIO_FLAG_DDT_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
+#define	ZIO_FLAG_GANG_INHERIT	(ZIO_FLAG_IO_RETRY - 1)
+
+	/*
+	 * Flags inherited by vdev children.
+	 */
+	ZIO_FLAG_IO_RETRY	= 1 << 13,	/* must be first for INHERIT */
+	ZIO_FLAG_PROBE		= 1 << 14,
+	ZIO_FLAG_TRYHARD	= 1 << 15,
+	ZIO_FLAG_OPTIONAL	= 1 << 16,
+
+#define	ZIO_FLAG_VDEV_INHERIT	(ZIO_FLAG_DONT_QUEUE - 1)
+
+	/*
+	 * Flags not inherited by any children.
+	 */
+	ZIO_FLAG_DONT_QUEUE	= 1 << 17,	/* must be first for INHERIT */
+	ZIO_FLAG_DONT_PROPAGATE	= 1 << 18,
+	ZIO_FLAG_IO_BYPASS	= 1 << 19,
+	ZIO_FLAG_IO_REWRITE	= 1 << 20,
+	ZIO_FLAG_RAW		= 1 << 21,
+	ZIO_FLAG_GANG_CHILD	= 1 << 22,
+	ZIO_FLAG_DDT_CHILD	= 1 << 23,
+	ZIO_FLAG_GODFATHER	= 1 << 24
+};
+
+#define	ZIO_FLAG_MUSTSUCCEED		0
+
+#define	ZIO_DDT_CHILD_FLAGS(zio)				\
+	(((zio)->io_flags & ZIO_FLAG_DDT_INHERIT) |		\
+	ZIO_FLAG_DDT_CHILD | ZIO_FLAG_CANFAIL)
+
+#define	ZIO_GANG_CHILD_FLAGS(zio)				\
+	(((zio)->io_flags & ZIO_FLAG_GANG_INHERIT) |		\
+	ZIO_FLAG_GANG_CHILD | ZIO_FLAG_CANFAIL)
+
+#define	ZIO_VDEV_CHILD_FLAGS(zio)				\
+	(((zio)->io_flags & ZIO_FLAG_VDEV_INHERIT) |		\
+	ZIO_FLAG_CANFAIL)
+
+enum zio_child {
+	ZIO_CHILD_VDEV = 0,
+	ZIO_CHILD_GANG,
+	ZIO_CHILD_DDT,
+	ZIO_CHILD_LOGICAL,
+	ZIO_CHILD_TYPES
+};
+
+enum zio_wait_type {
+	ZIO_WAIT_READY = 0,
+	ZIO_WAIT_DONE,
+	ZIO_WAIT_TYPES
+};
+
+/*
+ * We'll take the unused errnos, 'EBADE' and 'EBADR' (from the Convergent
+ * graveyard) to indicate checksum errors and fragmentation.
+ */
+#define	ECKSUM	EBADE
+#define	EFRAGS	EBADR
+
+typedef void zio_done_func_t(zio_t *zio);
+
+extern uint8_t zio_priority_table[ZIO_PRIORITY_TABLE_SIZE];
+extern char *zio_type_name[ZIO_TYPES];
+
+/*
+ * A bookmark is a four-tuple <objset, object, level, blkid> that uniquely
+ * identifies any block in the pool.  By convention, the meta-objset (MOS)
+ * is objset 0, and the meta-dnode is object 0.  This covers all blocks
+ * except root blocks and ZIL blocks, which are defined as follows:
+ *
+ * Root blocks (objset_phys_t) are object 0, level -1:  <objset, 0, -1, 0>.
+ * ZIL blocks are bookmarked <objset, 0, -2, blkid == ZIL sequence number>.
+ * dmu_sync()ed ZIL data blocks are bookmarked <objset, object, -2, blkid>.
+ *
+ * Note: this structure is called a bookmark because its original purpose
+ * was to remember where to resume a pool-wide traverse.
+ *
+ * Note: this structure is passed between userland and the kernel.
+ * Therefore it must not change size or alignment between 32/64 bit
+ * compilation options.
+ */
+typedef struct zbookmark {
+	uint64_t	zb_objset;
+	uint64_t	zb_object;
+	int64_t		zb_level;
+	uint64_t	zb_blkid;
+} zbookmark_t;
+
+#define	SET_BOOKMARK(zb, objset, object, level, blkid)  \
+{                                                       \
+	(zb)->zb_objset = objset;                       \
+	(zb)->zb_object = object;                       \
+	(zb)->zb_level = level;                         \
+	(zb)->zb_blkid = blkid;                         \
+}
+
+#define	ZB_DESTROYED_OBJSET	(-1ULL)
+
+#define	ZB_ROOT_OBJECT		(0ULL)
+#define	ZB_ROOT_LEVEL		(-1LL)
+#define	ZB_ROOT_BLKID		(0ULL)
+
+#define	ZB_ZIL_OBJECT		(0ULL)
+#define	ZB_ZIL_LEVEL		(-2LL)
+
+typedef struct zio_prop {
+	enum zio_checksum	zp_checksum;
+	enum zio_compress	zp_compress;
+	dmu_object_type_t	zp_type;
+	uint8_t			zp_level;
+	uint8_t			zp_copies;
+	uint8_t			zp_dedup;
+	uint8_t			zp_dedup_verify;
+} zio_prop_t;
+
+typedef struct zio_cksum_report zio_cksum_report_t;
+
+typedef void zio_cksum_finish_f(zio_cksum_report_t *rep,
+    const void *good_data);
+typedef void zio_cksum_free_f(void *cbdata, size_t size);
+
+struct zio_bad_cksum;				/* defined in zio_checksum.h */
+
+struct zio_cksum_report {
+	struct zio_cksum_report *zcr_next;
+	nvlist_t		*zcr_ereport;
+	nvlist_t		*zcr_detector;
+	void			*zcr_cbdata;
+	size_t			zcr_cbinfo;	/* passed to zcr_free() */
+	uint64_t		zcr_align;
+	uint64_t		zcr_length;
+	zio_cksum_finish_f	*zcr_finish;
+	zio_cksum_free_f	*zcr_free;
+
+	/* internal use only */
+	struct zio_bad_cksum	*zcr_ckinfo;	/* information from failure */
+};
+
+typedef void zio_vsd_cksum_report_f(zio_t *zio, zio_cksum_report_t *zcr,
+    void *arg);
+
+zio_vsd_cksum_report_f	zio_vsd_default_cksum_report;
+
+typedef struct zio_vsd_ops {
+	zio_done_func_t		*vsd_free;
+	zio_vsd_cksum_report_f	*vsd_cksum_report;
+} zio_vsd_ops_t;
+
+typedef struct zio_gang_node {
+	zio_gbh_phys_t		*gn_gbh;
+	struct zio_gang_node	*gn_child[SPA_GBH_NBLKPTRS];
+} zio_gang_node_t;
+
+typedef zio_t *zio_gang_issue_func_t(zio_t *zio, blkptr_t *bp,
+    zio_gang_node_t *gn, void *data);
+
+typedef void zio_transform_func_t(zio_t *zio, void *data, uint64_t size);
+
+typedef struct zio_transform {
+	void			*zt_orig_data;
+	uint64_t		zt_orig_size;
+	uint64_t		zt_bufsize;
+	zio_transform_func_t	*zt_transform;
+	struct zio_transform	*zt_next;
+} zio_transform_t;
+
+typedef int zio_pipe_stage_t(zio_t *zio);
+
+/*
+ * The io_reexecute flags are distinct from io_flags because the child must
+ * be able to propagate them to the parent.  The normal io_flags are local
+ * to the zio, not protected by any lock, and not modifiable by children;
+ * the reexecute flags are protected by io_lock, modifiable by children,
+ * and always propagated -- even when ZIO_FLAG_DONT_PROPAGATE is set.
+ */
+#define	ZIO_REEXECUTE_NOW	0x01
+#define	ZIO_REEXECUTE_SUSPEND	0x02
+
+typedef struct zio_link {
+	zio_t		*zl_parent;
+	zio_t		*zl_child;
+	list_node_t	zl_parent_node;
+	list_node_t	zl_child_node;
+} zio_link_t;
+
+struct zio {
+	/* Core information about this I/O */
+	zbookmark_t	io_bookmark;
+	zio_prop_t	io_prop;
+	zio_type_t	io_type;
+	enum zio_child	io_child_type;
+	int		io_cmd;
+	uint8_t		io_priority;
+	uint8_t		io_reexecute;
+	uint8_t		io_state[ZIO_WAIT_TYPES];
+	uint64_t	io_txg;
+	spa_t		*io_spa;
+	blkptr_t	*io_bp;
+	blkptr_t	*io_bp_override;
+	blkptr_t	io_bp_copy;
+	list_t		io_parent_list;
+	list_t		io_child_list;
+	zio_link_t	*io_walk_link;
+	zio_t		*io_logical;
+	zio_transform_t *io_transform_stack;
+
+	/* Callback info */
+	zio_done_func_t	*io_ready;
+	zio_done_func_t	*io_done;
+	void		*io_private;
+	int64_t		io_prev_space_delta;	/* DMU private */
+	blkptr_t	io_bp_orig;
+
+	/* Data represented by this I/O */
+	void		*io_data;
+	void		*io_orig_data;
+	uint64_t	io_size;
+	uint64_t	io_orig_size;
+
+	/* Stuff for the vdev stack */
+	vdev_t		*io_vd;
+	void		*io_vsd;
+	const zio_vsd_ops_t *io_vsd_ops;
+
+	uint64_t	io_offset;
+	uint64_t	io_deadline;
+	avl_node_t	io_offset_node;
+	avl_node_t	io_deadline_node;
+	avl_tree_t	*io_vdev_tree;
+
+	/* Internal pipeline state */
+	enum zio_flag	io_flags;
+	enum zio_stage	io_stage;
+	enum zio_stage	io_pipeline;
+	enum zio_flag	io_orig_flags;
+	enum zio_stage	io_orig_stage;
+	enum zio_stage	io_orig_pipeline;
+	int		io_error;
+	int		io_child_error[ZIO_CHILD_TYPES];
+	uint64_t	io_children[ZIO_CHILD_TYPES][ZIO_WAIT_TYPES];
+	uint64_t	io_child_count;
+	uint64_t	io_parent_count;
+	uint64_t	*io_stall;
+	zio_t		*io_gang_leader;
+	zio_gang_node_t	*io_gang_tree;
+	void		*io_executor;
+	void		*io_waiter;
+	kmutex_t	io_lock;
+	kcondvar_t	io_cv;
+
+	/* FMA state */
+	zio_cksum_report_t *io_cksum_report;
+	uint64_t	io_ena;
+};
+
+extern zio_t *zio_null(zio_t *pio, spa_t *spa, vdev_t *vd,
+    zio_done_func_t *done, void *private, enum zio_flag flags);
+
+extern zio_t *zio_root(spa_t *spa,
+    zio_done_func_t *done, void *private, enum zio_flag flags);
+
+extern zio_t *zio_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, void *data,
+    uint64_t size, zio_done_func_t *done, void *private,
+    int priority, enum zio_flag flags, const zbookmark_t *zb);
+
+extern zio_t *zio_write(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
+    void *data, uint64_t size, const zio_prop_t *zp,
+    zio_done_func_t *ready, zio_done_func_t *done, void *private,
+    int priority, enum zio_flag flags, const zbookmark_t *zb);
+
+extern zio_t *zio_rewrite(zio_t *pio, spa_t *spa, uint64_t txg, blkptr_t *bp,
+    void *data, uint64_t size, zio_done_func_t *done, void *private,
+    int priority, enum zio_flag flags, zbookmark_t *zb);
+
+extern void zio_write_override(zio_t *zio, blkptr_t *bp, int copies);
+
+extern void zio_free(spa_t *spa, uint64_t txg, const blkptr_t *bp);
+
+extern zio_t *zio_claim(zio_t *pio, spa_t *spa, uint64_t txg,
+    const blkptr_t *bp,
+    zio_done_func_t *done, void *private, enum zio_flag flags);
+
+extern zio_t *zio_ioctl(zio_t *pio, spa_t *spa, vdev_t *vd, int cmd,
+    zio_done_func_t *done, void *private, int priority, enum zio_flag flags);
+
+extern zio_t *zio_read_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
+    uint64_t size, void *data, int checksum,
+    zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
+    boolean_t labels);
+
+extern zio_t *zio_write_phys(zio_t *pio, vdev_t *vd, uint64_t offset,
+    uint64_t size, void *data, int checksum,
+    zio_done_func_t *done, void *private, int priority, enum zio_flag flags,
+    boolean_t labels);
+
+extern zio_t *zio_free_sync(zio_t *pio, spa_t *spa, uint64_t txg,
+    const blkptr_t *bp, enum zio_flag flags);
+
+extern int zio_alloc_zil(spa_t *spa, uint64_t txg, blkptr_t *new_bp,
+    blkptr_t *old_bp, uint64_t size, boolean_t use_slog);
+extern void zio_free_zil(spa_t *spa, uint64_t txg, blkptr_t *bp);
+extern void zio_flush(zio_t *zio, vdev_t *vd);
+extern void zio_shrink(zio_t *zio, uint64_t size);
+
+extern int zio_wait(zio_t *zio);
+extern void zio_nowait(zio_t *zio);
+extern void zio_execute(zio_t *zio);
+extern void zio_interrupt(zio_t *zio);
+
+extern zio_t *zio_walk_parents(zio_t *cio);
+extern zio_t *zio_walk_children(zio_t *pio);
+extern zio_t *zio_unique_parent(zio_t *cio);
+extern void zio_add_child(zio_t *pio, zio_t *cio);
+
+extern void *zio_buf_alloc(size_t size);
+extern void zio_buf_free(void *buf, size_t size);
+extern void *zio_data_buf_alloc(size_t size);
+extern void zio_data_buf_free(void *buf, size_t size);
+
+extern void zio_resubmit_stage_async(void *);
+
+extern zio_t *zio_vdev_child_io(zio_t *zio, blkptr_t *bp, vdev_t *vd,
+    uint64_t offset, void *data, uint64_t size, int type, int priority,
+    enum zio_flag flags, zio_done_func_t *done, void *private);
+
+extern zio_t *zio_vdev_delegated_io(vdev_t *vd, uint64_t offset,
+    void *data, uint64_t size, int type, int priority,
+    enum zio_flag flags, zio_done_func_t *done, void *private);
+
+extern void zio_vdev_io_bypass(zio_t *zio);
+extern void zio_vdev_io_reissue(zio_t *zio);
+extern void zio_vdev_io_redone(zio_t *zio);
+
+extern void zio_checksum_verified(zio_t *zio);
+extern int zio_worst_error(int e1, int e2);
+
+extern enum zio_checksum zio_checksum_select(enum zio_checksum child,
+    enum zio_checksum parent);
+extern enum zio_checksum zio_checksum_dedup_select(spa_t *spa,
+    enum zio_checksum child, enum zio_checksum parent);
+extern enum zio_compress zio_compress_select(enum zio_compress child,
+    enum zio_compress parent);
+
+extern void zio_suspend(spa_t *spa, zio_t *zio);
+extern int zio_resume(spa_t *spa);
+extern void zio_resume_wait(spa_t *spa);
+
+/*
+ * Initial setup and teardown.
+ */
+extern void zio_init(void);
+extern void zio_fini(void);
+
+/*
+ * Fault injection
+ */
+struct zinject_record;
+extern uint32_t zio_injection_enabled;
+extern int zio_inject_fault(char *name, int flags, int *id,
+    struct zinject_record *record);
+extern int zio_inject_list_next(int *id, char *name, size_t buflen,
+    struct zinject_record *record);
+extern int zio_clear_fault(int id);
+extern void zio_handle_panic_injection(spa_t *spa, char *tag, uint64_t type);
+extern int zio_handle_fault_injection(zio_t *zio, int error);
+extern int zio_handle_device_injection(vdev_t *vd, zio_t *zio, int error);
+extern int zio_handle_label_injection(zio_t *zio, int error);
+extern void zio_handle_ignored_writes(zio_t *zio);
+
+/*
+ * Checksum ereport functions
+ */
+extern void zfs_ereport_start_checksum(spa_t *spa, vdev_t *vd, struct zio *zio,
+    uint64_t offset, uint64_t length, void *arg, struct zio_bad_cksum *info);
+extern void zfs_ereport_finish_checksum(zio_cksum_report_t *report,
+    const void *good_data, const void *bad_data, boolean_t drop_if_identical);
+
+extern void zfs_ereport_send_interim_checksum(zio_cksum_report_t *report);
+extern void zfs_ereport_free_checksum(zio_cksum_report_t *report);
+
+/* If we have the good data in hand, this function can be used */
+extern void zfs_ereport_post_checksum(spa_t *spa, vdev_t *vd,
+    struct zio *zio, uint64_t offset, uint64_t length,
+    const void *good_data, const void *bad_data, struct zio_bad_cksum *info);
+
+/* Called from spa_sync(), but primarily an injection handler */
+extern void spa_handle_ignored_writes(spa_t *spa);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _ZIO_H */