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-rw-r--r--uts/common/fs/zfs/sys/dmu.h740
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diff --git a/uts/common/fs/zfs/sys/dmu.h b/uts/common/fs/zfs/sys/dmu.h
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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.
+ */
+
+/* Portions Copyright 2010 Robert Milkowski */
+
+#ifndef _SYS_DMU_H
+#define _SYS_DMU_H
+
+/*
+ * This file describes the interface that the DMU provides for its
+ * consumers.
+ *
+ * The DMU also interacts with the SPA. That interface is described in
+ * dmu_spa.h.
+ */
+
+#include <sys/inttypes.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/cred.h>
+#include <sys/time.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct uio;
+struct xuio;
+struct page;
+struct vnode;
+struct spa;
+struct zilog;
+struct zio;
+struct blkptr;
+struct zap_cursor;
+struct dsl_dataset;
+struct dsl_pool;
+struct dnode;
+struct drr_begin;
+struct drr_end;
+struct zbookmark;
+struct spa;
+struct nvlist;
+struct arc_buf;
+struct zio_prop;
+struct sa_handle;
+
+typedef struct objset objset_t;
+typedef struct dmu_tx dmu_tx_t;
+typedef struct dsl_dir dsl_dir_t;
+
+typedef enum dmu_object_type {
+ DMU_OT_NONE,
+ /* general: */
+ DMU_OT_OBJECT_DIRECTORY, /* ZAP */
+ DMU_OT_OBJECT_ARRAY, /* UINT64 */
+ DMU_OT_PACKED_NVLIST, /* UINT8 (XDR by nvlist_pack/unpack) */
+ DMU_OT_PACKED_NVLIST_SIZE, /* UINT64 */
+ DMU_OT_BPOBJ, /* UINT64 */
+ DMU_OT_BPOBJ_HDR, /* UINT64 */
+ /* spa: */
+ DMU_OT_SPACE_MAP_HEADER, /* UINT64 */
+ DMU_OT_SPACE_MAP, /* UINT64 */
+ /* zil: */
+ DMU_OT_INTENT_LOG, /* UINT64 */
+ /* dmu: */
+ DMU_OT_DNODE, /* DNODE */
+ DMU_OT_OBJSET, /* OBJSET */
+ /* dsl: */
+ DMU_OT_DSL_DIR, /* UINT64 */
+ DMU_OT_DSL_DIR_CHILD_MAP, /* ZAP */
+ DMU_OT_DSL_DS_SNAP_MAP, /* ZAP */
+ DMU_OT_DSL_PROPS, /* ZAP */
+ DMU_OT_DSL_DATASET, /* UINT64 */
+ /* zpl: */
+ DMU_OT_ZNODE, /* ZNODE */
+ DMU_OT_OLDACL, /* Old ACL */
+ DMU_OT_PLAIN_FILE_CONTENTS, /* UINT8 */
+ DMU_OT_DIRECTORY_CONTENTS, /* ZAP */
+ DMU_OT_MASTER_NODE, /* ZAP */
+ DMU_OT_UNLINKED_SET, /* ZAP */
+ /* zvol: */
+ DMU_OT_ZVOL, /* UINT8 */
+ DMU_OT_ZVOL_PROP, /* ZAP */
+ /* other; for testing only! */
+ DMU_OT_PLAIN_OTHER, /* UINT8 */
+ DMU_OT_UINT64_OTHER, /* UINT64 */
+ DMU_OT_ZAP_OTHER, /* ZAP */
+ /* new object types: */
+ DMU_OT_ERROR_LOG, /* ZAP */
+ DMU_OT_SPA_HISTORY, /* UINT8 */
+ DMU_OT_SPA_HISTORY_OFFSETS, /* spa_his_phys_t */
+ DMU_OT_POOL_PROPS, /* ZAP */
+ DMU_OT_DSL_PERMS, /* ZAP */
+ DMU_OT_ACL, /* ACL */
+ DMU_OT_SYSACL, /* SYSACL */
+ DMU_OT_FUID, /* FUID table (Packed NVLIST UINT8) */
+ DMU_OT_FUID_SIZE, /* FUID table size UINT64 */
+ DMU_OT_NEXT_CLONES, /* ZAP */
+ DMU_OT_SCAN_QUEUE, /* ZAP */
+ DMU_OT_USERGROUP_USED, /* ZAP */
+ DMU_OT_USERGROUP_QUOTA, /* ZAP */
+ DMU_OT_USERREFS, /* ZAP */
+ DMU_OT_DDT_ZAP, /* ZAP */
+ DMU_OT_DDT_STATS, /* ZAP */
+ DMU_OT_SA, /* System attr */
+ DMU_OT_SA_MASTER_NODE, /* ZAP */
+ DMU_OT_SA_ATTR_REGISTRATION, /* ZAP */
+ DMU_OT_SA_ATTR_LAYOUTS, /* ZAP */
+ DMU_OT_SCAN_XLATE, /* ZAP */
+ DMU_OT_DEDUP, /* fake dedup BP from ddt_bp_create() */
+ DMU_OT_DEADLIST, /* ZAP */
+ DMU_OT_DEADLIST_HDR, /* UINT64 */
+ DMU_OT_DSL_CLONES, /* ZAP */
+ DMU_OT_BPOBJ_SUBOBJ, /* UINT64 */
+ DMU_OT_NUMTYPES
+} dmu_object_type_t;
+
+typedef enum dmu_objset_type {
+ DMU_OST_NONE,
+ DMU_OST_META,
+ DMU_OST_ZFS,
+ DMU_OST_ZVOL,
+ DMU_OST_OTHER, /* For testing only! */
+ DMU_OST_ANY, /* Be careful! */
+ DMU_OST_NUMTYPES
+} dmu_objset_type_t;
+
+void byteswap_uint64_array(void *buf, size_t size);
+void byteswap_uint32_array(void *buf, size_t size);
+void byteswap_uint16_array(void *buf, size_t size);
+void byteswap_uint8_array(void *buf, size_t size);
+void zap_byteswap(void *buf, size_t size);
+void zfs_oldacl_byteswap(void *buf, size_t size);
+void zfs_acl_byteswap(void *buf, size_t size);
+void zfs_znode_byteswap(void *buf, size_t size);
+
+#define DS_FIND_SNAPSHOTS (1<<0)
+#define DS_FIND_CHILDREN (1<<1)
+
+/*
+ * The maximum number of bytes that can be accessed as part of one
+ * operation, including metadata.
+ */
+#define DMU_MAX_ACCESS (10<<20) /* 10MB */
+#define DMU_MAX_DELETEBLKCNT (20480) /* ~5MB of indirect blocks */
+
+#define DMU_USERUSED_OBJECT (-1ULL)
+#define DMU_GROUPUSED_OBJECT (-2ULL)
+#define DMU_DEADLIST_OBJECT (-3ULL)
+
+/*
+ * artificial blkids for bonus buffer and spill blocks
+ */
+#define DMU_BONUS_BLKID (-1ULL)
+#define DMU_SPILL_BLKID (-2ULL)
+/*
+ * Public routines to create, destroy, open, and close objsets.
+ */
+int dmu_objset_hold(const char *name, void *tag, objset_t **osp);
+int dmu_objset_own(const char *name, dmu_objset_type_t type,
+ boolean_t readonly, void *tag, objset_t **osp);
+void dmu_objset_rele(objset_t *os, void *tag);
+void dmu_objset_disown(objset_t *os, void *tag);
+int dmu_objset_open_ds(struct dsl_dataset *ds, objset_t **osp);
+
+int dmu_objset_evict_dbufs(objset_t *os);
+int dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags,
+ void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg);
+int dmu_objset_clone(const char *name, struct dsl_dataset *clone_origin,
+ uint64_t flags);
+int dmu_objset_destroy(const char *name, boolean_t defer);
+int dmu_snapshots_destroy(char *fsname, char *snapname, boolean_t defer);
+int dmu_objset_snapshot(char *fsname, char *snapname, char *tag,
+ struct nvlist *props, boolean_t recursive, boolean_t temporary, int fd);
+int dmu_objset_rename(const char *name, const char *newname,
+ boolean_t recursive);
+int dmu_objset_find(char *name, int func(const char *, void *), void *arg,
+ int flags);
+void dmu_objset_byteswap(void *buf, size_t size);
+
+typedef struct dmu_buf {
+ uint64_t db_object; /* object that this buffer is part of */
+ uint64_t db_offset; /* byte offset in this object */
+ uint64_t db_size; /* size of buffer in bytes */
+ void *db_data; /* data in buffer */
+} dmu_buf_t;
+
+typedef void dmu_buf_evict_func_t(struct dmu_buf *db, void *user_ptr);
+
+/*
+ * The names of zap entries in the DIRECTORY_OBJECT of the MOS.
+ */
+#define DMU_POOL_DIRECTORY_OBJECT 1
+#define DMU_POOL_CONFIG "config"
+#define DMU_POOL_ROOT_DATASET "root_dataset"
+#define DMU_POOL_SYNC_BPOBJ "sync_bplist"
+#define DMU_POOL_ERRLOG_SCRUB "errlog_scrub"
+#define DMU_POOL_ERRLOG_LAST "errlog_last"
+#define DMU_POOL_SPARES "spares"
+#define DMU_POOL_DEFLATE "deflate"
+#define DMU_POOL_HISTORY "history"
+#define DMU_POOL_PROPS "pool_props"
+#define DMU_POOL_L2CACHE "l2cache"
+#define DMU_POOL_TMP_USERREFS "tmp_userrefs"
+#define DMU_POOL_DDT "DDT-%s-%s-%s"
+#define DMU_POOL_DDT_STATS "DDT-statistics"
+#define DMU_POOL_CREATION_VERSION "creation_version"
+#define DMU_POOL_SCAN "scan"
+#define DMU_POOL_FREE_BPOBJ "free_bpobj"
+
+/*
+ * Allocate an object from this objset. The range of object numbers
+ * available is (0, DN_MAX_OBJECT). Object 0 is the meta-dnode.
+ *
+ * The transaction must be assigned to a txg. The newly allocated
+ * object will be "held" in the transaction (ie. you can modify the
+ * newly allocated object in this transaction).
+ *
+ * dmu_object_alloc() chooses an object and returns it in *objectp.
+ *
+ * dmu_object_claim() allocates a specific object number. If that
+ * number is already allocated, it fails and returns EEXIST.
+ *
+ * Return 0 on success, or ENOSPC or EEXIST as specified above.
+ */
+uint64_t dmu_object_alloc(objset_t *os, dmu_object_type_t ot,
+ int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
+int dmu_object_claim(objset_t *os, uint64_t object, dmu_object_type_t ot,
+ int blocksize, dmu_object_type_t bonus_type, int bonus_len, dmu_tx_t *tx);
+int dmu_object_reclaim(objset_t *os, uint64_t object, dmu_object_type_t ot,
+ int blocksize, dmu_object_type_t bonustype, int bonuslen);
+
+/*
+ * Free an object from this objset.
+ *
+ * The object's data will be freed as well (ie. you don't need to call
+ * dmu_free(object, 0, -1, tx)).
+ *
+ * The object need not be held in the transaction.
+ *
+ * If there are any holds on this object's buffers (via dmu_buf_hold()),
+ * or tx holds on the object (via dmu_tx_hold_object()), you can not
+ * free it; it fails and returns EBUSY.
+ *
+ * If the object is not allocated, it fails and returns ENOENT.
+ *
+ * Return 0 on success, or EBUSY or ENOENT as specified above.
+ */
+int dmu_object_free(objset_t *os, uint64_t object, dmu_tx_t *tx);
+
+/*
+ * Find the next allocated or free object.
+ *
+ * The objectp parameter is in-out. It will be updated to be the next
+ * object which is allocated. Ignore objects which have not been
+ * modified since txg.
+ *
+ * XXX Can only be called on a objset with no dirty data.
+ *
+ * Returns 0 on success, or ENOENT if there are no more objects.
+ */
+int dmu_object_next(objset_t *os, uint64_t *objectp,
+ boolean_t hole, uint64_t txg);
+
+/*
+ * Set the data blocksize for an object.
+ *
+ * The object cannot have any blocks allcated beyond the first. If
+ * the first block is allocated already, the new size must be greater
+ * than the current block size. If these conditions are not met,
+ * ENOTSUP will be returned.
+ *
+ * Returns 0 on success, or EBUSY if there are any holds on the object
+ * contents, or ENOTSUP as described above.
+ */
+int dmu_object_set_blocksize(objset_t *os, uint64_t object, uint64_t size,
+ int ibs, dmu_tx_t *tx);
+
+/*
+ * Set the checksum property on a dnode. The new checksum algorithm will
+ * apply to all newly written blocks; existing blocks will not be affected.
+ */
+void dmu_object_set_checksum(objset_t *os, uint64_t object, uint8_t checksum,
+ dmu_tx_t *tx);
+
+/*
+ * Set the compress property on a dnode. The new compression algorithm will
+ * apply to all newly written blocks; existing blocks will not be affected.
+ */
+void dmu_object_set_compress(objset_t *os, uint64_t object, uint8_t compress,
+ dmu_tx_t *tx);
+
+/*
+ * Decide how to write a block: checksum, compression, number of copies, etc.
+ */
+#define WP_NOFILL 0x1
+#define WP_DMU_SYNC 0x2
+#define WP_SPILL 0x4
+
+void dmu_write_policy(objset_t *os, struct dnode *dn, int level, int wp,
+ struct zio_prop *zp);
+/*
+ * The bonus data is accessed more or less like a regular buffer.
+ * You must dmu_bonus_hold() to get the buffer, which will give you a
+ * dmu_buf_t with db_offset==-1ULL, and db_size = the size of the bonus
+ * data. As with any normal buffer, you must call dmu_buf_read() to
+ * read db_data, dmu_buf_will_dirty() before modifying it, and the
+ * object must be held in an assigned transaction before calling
+ * dmu_buf_will_dirty. You may use dmu_buf_set_user() on the bonus
+ * buffer as well. You must release your hold with dmu_buf_rele().
+ */
+int dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **);
+int dmu_bonus_max(void);
+int dmu_set_bonus(dmu_buf_t *, int, dmu_tx_t *);
+int dmu_set_bonustype(dmu_buf_t *, dmu_object_type_t, dmu_tx_t *);
+dmu_object_type_t dmu_get_bonustype(dmu_buf_t *);
+int dmu_rm_spill(objset_t *, uint64_t, dmu_tx_t *);
+
+/*
+ * Special spill buffer support used by "SA" framework
+ */
+
+int dmu_spill_hold_by_bonus(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp);
+int dmu_spill_hold_by_dnode(struct dnode *dn, uint32_t flags,
+ void *tag, dmu_buf_t **dbp);
+int dmu_spill_hold_existing(dmu_buf_t *bonus, void *tag, dmu_buf_t **dbp);
+
+/*
+ * Obtain the DMU buffer from the specified object which contains the
+ * specified offset. dmu_buf_hold() puts a "hold" on the buffer, so
+ * that it will remain in memory. You must release the hold with
+ * dmu_buf_rele(). You musn't access the dmu_buf_t after releasing your
+ * hold. You must have a hold on any dmu_buf_t* you pass to the DMU.
+ *
+ * You must call dmu_buf_read, dmu_buf_will_dirty, or dmu_buf_will_fill
+ * on the returned buffer before reading or writing the buffer's
+ * db_data. The comments for those routines describe what particular
+ * operations are valid after calling them.
+ *
+ * The object number must be a valid, allocated object number.
+ */
+int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
+ void *tag, dmu_buf_t **, int flags);
+void dmu_buf_add_ref(dmu_buf_t *db, void* tag);
+void dmu_buf_rele(dmu_buf_t *db, void *tag);
+uint64_t dmu_buf_refcount(dmu_buf_t *db);
+
+/*
+ * dmu_buf_hold_array holds the DMU buffers which contain all bytes in a
+ * range of an object. A pointer to an array of dmu_buf_t*'s is
+ * returned (in *dbpp).
+ *
+ * dmu_buf_rele_array releases the hold on an array of dmu_buf_t*'s, and
+ * frees the array. The hold on the array of buffers MUST be released
+ * with dmu_buf_rele_array. You can NOT release the hold on each buffer
+ * individually with dmu_buf_rele.
+ */
+int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset,
+ uint64_t length, int read, void *tag, int *numbufsp, dmu_buf_t ***dbpp);
+void dmu_buf_rele_array(dmu_buf_t **, int numbufs, void *tag);
+
+/*
+ * Returns NULL on success, or the existing user ptr if it's already
+ * been set.
+ *
+ * user_ptr is for use by the user and can be obtained via dmu_buf_get_user().
+ *
+ * user_data_ptr_ptr should be NULL, or a pointer to a pointer which
+ * will be set to db->db_data when you are allowed to access it. Note
+ * that db->db_data (the pointer) can change when you do dmu_buf_read(),
+ * dmu_buf_tryupgrade(), dmu_buf_will_dirty(), or dmu_buf_will_fill().
+ * *user_data_ptr_ptr will be set to the new value when it changes.
+ *
+ * If non-NULL, pageout func will be called when this buffer is being
+ * excised from the cache, so that you can clean up the data structure
+ * pointed to by user_ptr.
+ *
+ * dmu_evict_user() will call the pageout func for all buffers in a
+ * objset with a given pageout func.
+ */
+void *dmu_buf_set_user(dmu_buf_t *db, void *user_ptr, void *user_data_ptr_ptr,
+ dmu_buf_evict_func_t *pageout_func);
+/*
+ * set_user_ie is the same as set_user, but request immediate eviction
+ * when hold count goes to zero.
+ */
+void *dmu_buf_set_user_ie(dmu_buf_t *db, void *user_ptr,
+ void *user_data_ptr_ptr, dmu_buf_evict_func_t *pageout_func);
+void *dmu_buf_update_user(dmu_buf_t *db_fake, void *old_user_ptr,
+ void *user_ptr, void *user_data_ptr_ptr,
+ dmu_buf_evict_func_t *pageout_func);
+void dmu_evict_user(objset_t *os, dmu_buf_evict_func_t *func);
+
+/*
+ * Returns the user_ptr set with dmu_buf_set_user(), or NULL if not set.
+ */
+void *dmu_buf_get_user(dmu_buf_t *db);
+
+/*
+ * Indicate that you are going to modify the buffer's data (db_data).
+ *
+ * The transaction (tx) must be assigned to a txg (ie. you've called
+ * dmu_tx_assign()). The buffer's object must be held in the tx
+ * (ie. you've called dmu_tx_hold_object(tx, db->db_object)).
+ */
+void dmu_buf_will_dirty(dmu_buf_t *db, dmu_tx_t *tx);
+
+/*
+ * Tells if the given dbuf is freeable.
+ */
+boolean_t dmu_buf_freeable(dmu_buf_t *);
+
+/*
+ * You must create a transaction, then hold the objects which you will
+ * (or might) modify as part of this transaction. Then you must assign
+ * the transaction to a transaction group. Once the transaction has
+ * been assigned, you can modify buffers which belong to held objects as
+ * part of this transaction. You can't modify buffers before the
+ * transaction has been assigned; you can't modify buffers which don't
+ * belong to objects which this transaction holds; you can't hold
+ * objects once the transaction has been assigned. You may hold an
+ * object which you are going to free (with dmu_object_free()), but you
+ * don't have to.
+ *
+ * You can abort the transaction before it has been assigned.
+ *
+ * Note that you may hold buffers (with dmu_buf_hold) at any time,
+ * regardless of transaction state.
+ */
+
+#define DMU_NEW_OBJECT (-1ULL)
+#define DMU_OBJECT_END (-1ULL)
+
+dmu_tx_t *dmu_tx_create(objset_t *os);
+void dmu_tx_hold_write(dmu_tx_t *tx, uint64_t object, uint64_t off, int len);
+void dmu_tx_hold_free(dmu_tx_t *tx, uint64_t object, uint64_t off,
+ uint64_t len);
+void dmu_tx_hold_zap(dmu_tx_t *tx, uint64_t object, int add, const char *name);
+void dmu_tx_hold_bonus(dmu_tx_t *tx, uint64_t object);
+void dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object);
+void dmu_tx_hold_sa(dmu_tx_t *tx, struct sa_handle *hdl, boolean_t may_grow);
+void dmu_tx_hold_sa_create(dmu_tx_t *tx, int total_size);
+void dmu_tx_abort(dmu_tx_t *tx);
+int dmu_tx_assign(dmu_tx_t *tx, uint64_t txg_how);
+void dmu_tx_wait(dmu_tx_t *tx);
+void dmu_tx_commit(dmu_tx_t *tx);
+
+/*
+ * To register a commit callback, dmu_tx_callback_register() must be called.
+ *
+ * dcb_data is a pointer to caller private data that is passed on as a
+ * callback parameter. The caller is responsible for properly allocating and
+ * freeing it.
+ *
+ * When registering a callback, the transaction must be already created, but
+ * it cannot be committed or aborted. It can be assigned to a txg or not.
+ *
+ * The callback will be called after the transaction has been safely written
+ * to stable storage and will also be called if the dmu_tx is aborted.
+ * If there is any error which prevents the transaction from being committed to
+ * disk, the callback will be called with a value of error != 0.
+ */
+typedef void dmu_tx_callback_func_t(void *dcb_data, int error);
+
+void dmu_tx_callback_register(dmu_tx_t *tx, dmu_tx_callback_func_t *dcb_func,
+ void *dcb_data);
+
+/*
+ * Free up the data blocks for a defined range of a file. If size is
+ * zero, the range from offset to end-of-file is freed.
+ */
+int dmu_free_range(objset_t *os, uint64_t object, uint64_t offset,
+ uint64_t size, dmu_tx_t *tx);
+int dmu_free_long_range(objset_t *os, uint64_t object, uint64_t offset,
+ uint64_t size);
+int dmu_free_object(objset_t *os, uint64_t object);
+
+/*
+ * Convenience functions.
+ *
+ * Canfail routines will return 0 on success, or an errno if there is a
+ * nonrecoverable I/O error.
+ */
+#define DMU_READ_PREFETCH 0 /* prefetch */
+#define DMU_READ_NO_PREFETCH 1 /* don't prefetch */
+int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
+ void *buf, uint32_t flags);
+void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
+ const void *buf, dmu_tx_t *tx);
+void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
+ dmu_tx_t *tx);
+int dmu_read_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size);
+int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size,
+ dmu_tx_t *tx);
+int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size,
+ dmu_tx_t *tx);
+int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset,
+ uint64_t size, struct page *pp, dmu_tx_t *tx);
+struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size);
+void dmu_return_arcbuf(struct arc_buf *buf);
+void dmu_assign_arcbuf(dmu_buf_t *handle, uint64_t offset, struct arc_buf *buf,
+ dmu_tx_t *tx);
+int dmu_xuio_init(struct xuio *uio, int niov);
+void dmu_xuio_fini(struct xuio *uio);
+int dmu_xuio_add(struct xuio *uio, struct arc_buf *abuf, offset_t off,
+ size_t n);
+int dmu_xuio_cnt(struct xuio *uio);
+struct arc_buf *dmu_xuio_arcbuf(struct xuio *uio, int i);
+void dmu_xuio_clear(struct xuio *uio, int i);
+void xuio_stat_wbuf_copied();
+void xuio_stat_wbuf_nocopy();
+
+extern int zfs_prefetch_disable;
+
+/*
+ * Asynchronously try to read in the data.
+ */
+void dmu_prefetch(objset_t *os, uint64_t object, uint64_t offset,
+ uint64_t len);
+
+typedef struct dmu_object_info {
+ /* All sizes are in bytes unless otherwise indicated. */
+ uint32_t doi_data_block_size;
+ uint32_t doi_metadata_block_size;
+ dmu_object_type_t doi_type;
+ dmu_object_type_t doi_bonus_type;
+ uint64_t doi_bonus_size;
+ uint8_t doi_indirection; /* 2 = dnode->indirect->data */
+ uint8_t doi_checksum;
+ uint8_t doi_compress;
+ uint8_t doi_pad[5];
+ uint64_t doi_physical_blocks_512; /* data + metadata, 512b blks */
+ uint64_t doi_max_offset;
+ uint64_t doi_fill_count; /* number of non-empty blocks */
+} dmu_object_info_t;
+
+typedef void arc_byteswap_func_t(void *buf, size_t size);
+
+typedef struct dmu_object_type_info {
+ arc_byteswap_func_t *ot_byteswap;
+ boolean_t ot_metadata;
+ char *ot_name;
+} dmu_object_type_info_t;
+
+extern const dmu_object_type_info_t dmu_ot[DMU_OT_NUMTYPES];
+
+/*
+ * Get information on a DMU object.
+ *
+ * Return 0 on success or ENOENT if object is not allocated.
+ *
+ * If doi is NULL, just indicates whether the object exists.
+ */
+int dmu_object_info(objset_t *os, uint64_t object, dmu_object_info_t *doi);
+void dmu_object_info_from_dnode(struct dnode *dn, dmu_object_info_t *doi);
+void dmu_object_info_from_db(dmu_buf_t *db, dmu_object_info_t *doi);
+void dmu_object_size_from_db(dmu_buf_t *db, uint32_t *blksize,
+ u_longlong_t *nblk512);
+
+typedef struct dmu_objset_stats {
+ uint64_t dds_num_clones; /* number of clones of this */
+ uint64_t dds_creation_txg;
+ uint64_t dds_guid;
+ dmu_objset_type_t dds_type;
+ uint8_t dds_is_snapshot;
+ uint8_t dds_inconsistent;
+ char dds_origin[MAXNAMELEN];
+} dmu_objset_stats_t;
+
+/*
+ * Get stats on a dataset.
+ */
+void dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat);
+
+/*
+ * Add entries to the nvlist for all the objset's properties. See
+ * zfs_prop_table[] and zfs(1m) for details on the properties.
+ */
+void dmu_objset_stats(objset_t *os, struct nvlist *nv);
+
+/*
+ * Get the space usage statistics for statvfs().
+ *
+ * refdbytes is the amount of space "referenced" by this objset.
+ * availbytes is the amount of space available to this objset, taking
+ * into account quotas & reservations, assuming that no other objsets
+ * use the space first. These values correspond to the 'referenced' and
+ * 'available' properties, described in the zfs(1m) manpage.
+ *
+ * usedobjs and availobjs are the number of objects currently allocated,
+ * and available.
+ */
+void dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp,
+ uint64_t *usedobjsp, uint64_t *availobjsp);
+
+/*
+ * The fsid_guid is a 56-bit ID that can change to avoid collisions.
+ * (Contrast with the ds_guid which is a 64-bit ID that will never
+ * change, so there is a small probability that it will collide.)
+ */
+uint64_t dmu_objset_fsid_guid(objset_t *os);
+
+/*
+ * Get the [cm]time for an objset's snapshot dir
+ */
+timestruc_t dmu_objset_snap_cmtime(objset_t *os);
+
+int dmu_objset_is_snapshot(objset_t *os);
+
+extern struct spa *dmu_objset_spa(objset_t *os);
+extern struct zilog *dmu_objset_zil(objset_t *os);
+extern struct dsl_pool *dmu_objset_pool(objset_t *os);
+extern struct dsl_dataset *dmu_objset_ds(objset_t *os);
+extern void dmu_objset_name(objset_t *os, char *buf);
+extern dmu_objset_type_t dmu_objset_type(objset_t *os);
+extern uint64_t dmu_objset_id(objset_t *os);
+extern uint64_t dmu_objset_syncprop(objset_t *os);
+extern uint64_t dmu_objset_logbias(objset_t *os);
+extern int dmu_snapshot_list_next(objset_t *os, int namelen, char *name,
+ uint64_t *id, uint64_t *offp, boolean_t *case_conflict);
+extern int dmu_snapshot_realname(objset_t *os, char *name, char *real,
+ int maxlen, boolean_t *conflict);
+extern int dmu_dir_list_next(objset_t *os, int namelen, char *name,
+ uint64_t *idp, uint64_t *offp);
+
+typedef int objset_used_cb_t(dmu_object_type_t bonustype,
+ void *bonus, uint64_t *userp, uint64_t *groupp);
+extern void dmu_objset_register_type(dmu_objset_type_t ost,
+ objset_used_cb_t *cb);
+extern void dmu_objset_set_user(objset_t *os, void *user_ptr);
+extern void *dmu_objset_get_user(objset_t *os);
+
+/*
+ * Return the txg number for the given assigned transaction.
+ */
+uint64_t dmu_tx_get_txg(dmu_tx_t *tx);
+
+/*
+ * Synchronous write.
+ * If a parent zio is provided this function initiates a write on the
+ * provided buffer as a child of the parent zio.
+ * In the absence of a parent zio, the write is completed synchronously.
+ * At write completion, blk is filled with the bp of the written block.
+ * Note that while the data covered by this function will be on stable
+ * storage when the write completes this new data does not become a
+ * permanent part of the file until the associated transaction commits.
+ */
+
+/*
+ * {zfs,zvol,ztest}_get_done() args
+ */
+typedef struct zgd {
+ struct zilog *zgd_zilog;
+ struct blkptr *zgd_bp;
+ dmu_buf_t *zgd_db;
+ struct rl *zgd_rl;
+ void *zgd_private;
+} zgd_t;
+
+typedef void dmu_sync_cb_t(zgd_t *arg, int error);
+int dmu_sync(struct zio *zio, uint64_t txg, dmu_sync_cb_t *done, zgd_t *zgd);
+
+/*
+ * Find the next hole or data block in file starting at *off
+ * Return found offset in *off. Return ESRCH for end of file.
+ */
+int dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole,
+ uint64_t *off);
+
+/*
+ * Initial setup and final teardown.
+ */
+extern void dmu_init(void);
+extern void dmu_fini(void);
+
+typedef void (*dmu_traverse_cb_t)(objset_t *os, void *arg, struct blkptr *bp,
+ uint64_t object, uint64_t offset, int len);
+void dmu_traverse_objset(objset_t *os, uint64_t txg_start,
+ dmu_traverse_cb_t cb, void *arg);
+
+int dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin,
+ struct vnode *vp, offset_t *off);
+
+typedef struct dmu_recv_cookie {
+ /*
+ * This structure is opaque!
+ *
+ * If logical and real are different, we are recving the stream
+ * into the "real" temporary clone, and then switching it with
+ * the "logical" target.
+ */
+ struct dsl_dataset *drc_logical_ds;
+ struct dsl_dataset *drc_real_ds;
+ struct drr_begin *drc_drrb;
+ char *drc_tosnap;
+ char *drc_top_ds;
+ boolean_t drc_newfs;
+ boolean_t drc_force;
+} dmu_recv_cookie_t;
+
+int dmu_recv_begin(char *tofs, char *tosnap, char *topds, struct drr_begin *,
+ boolean_t force, objset_t *origin, dmu_recv_cookie_t *);
+int dmu_recv_stream(dmu_recv_cookie_t *drc, struct vnode *vp, offset_t *voffp,
+ int cleanup_fd, uint64_t *action_handlep);
+int dmu_recv_end(dmu_recv_cookie_t *drc);
+
+int dmu_diff(objset_t *tosnap, objset_t *fromsnap, struct vnode *vp,
+ offset_t *off);
+
+/* CRC64 table */
+#define ZFS_CRC64_POLY 0xC96C5795D7870F42ULL /* ECMA-182, reflected form */
+extern uint64_t zfs_crc64_table[256];
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_DMU_H */