507 lines
18 KiB
C
507 lines
18 KiB
C
/*
|
|
* 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.
|
|
* Copyright (c) 2013 by Delphix. All rights reserved.
|
|
* Copyright 2017 Nexenta Systems, Inc.
|
|
*/
|
|
|
|
#ifndef _SYS_ZAP_H
|
|
#define _SYS_ZAP_H
|
|
|
|
/*
|
|
* ZAP - ZFS Attribute Processor
|
|
*
|
|
* The ZAP is a module which sits on top of the DMU (Data Management
|
|
* Unit) and implements a higher-level storage primitive using DMU
|
|
* objects. Its primary consumer is the ZPL (ZFS Posix Layer).
|
|
*
|
|
* A "zapobj" is a DMU object which the ZAP uses to stores attributes.
|
|
* Users should use only zap routines to access a zapobj - they should
|
|
* not access the DMU object directly using DMU routines.
|
|
*
|
|
* The attributes stored in a zapobj are name-value pairs. The name is
|
|
* a zero-terminated string of up to ZAP_MAXNAMELEN bytes (including
|
|
* terminating NULL). The value is an array of integers, which may be
|
|
* 1, 2, 4, or 8 bytes long. The total space used by the array (number
|
|
* of integers * integer length) can be up to ZAP_MAXVALUELEN bytes.
|
|
* Note that an 8-byte integer value can be used to store the location
|
|
* (object number) of another dmu object (which may be itself a zapobj).
|
|
* Note that you can use a zero-length attribute to store a single bit
|
|
* of information - the attribute is present or not.
|
|
*
|
|
* The ZAP routines are thread-safe. However, you must observe the
|
|
* DMU's restriction that a transaction may not be operated on
|
|
* concurrently.
|
|
*
|
|
* Any of the routines that return an int may return an I/O error (EIO
|
|
* or ECHECKSUM).
|
|
*
|
|
*
|
|
* Implementation / Performance Notes:
|
|
*
|
|
* The ZAP is intended to operate most efficiently on attributes with
|
|
* short (49 bytes or less) names and single 8-byte values, for which
|
|
* the microzap will be used. The ZAP should be efficient enough so
|
|
* that the user does not need to cache these attributes.
|
|
*
|
|
* The ZAP's locking scheme makes its routines thread-safe. Operations
|
|
* on different zapobjs will be processed concurrently. Operations on
|
|
* the same zapobj which only read data will be processed concurrently.
|
|
* Operations on the same zapobj which modify data will be processed
|
|
* concurrently when there are many attributes in the zapobj (because
|
|
* the ZAP uses per-block locking - more than 128 * (number of cpus)
|
|
* small attributes will suffice).
|
|
*/
|
|
|
|
/*
|
|
* We're using zero-terminated byte strings (ie. ASCII or UTF-8 C
|
|
* strings) for the names of attributes, rather than a byte string
|
|
* bounded by an explicit length. If some day we want to support names
|
|
* in character sets which have embedded zeros (eg. UTF-16, UTF-32),
|
|
* we'll have to add routines for using length-bounded strings.
|
|
*/
|
|
|
|
#include <sys/dmu.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*
|
|
* Specifies matching criteria for ZAP lookups.
|
|
* MT_NORMALIZE Use ZAP normalization flags, which can include both
|
|
* unicode normalization and case-insensitivity.
|
|
* MT_MATCH_CASE Do case-sensitive lookups even if MT_NORMALIZE is
|
|
* specified and ZAP normalization flags include
|
|
* U8_TEXTPREP_TOUPPER.
|
|
*/
|
|
typedef enum matchtype {
|
|
MT_NORMALIZE = 1 << 0,
|
|
MT_MATCH_CASE = 1 << 1,
|
|
} matchtype_t;
|
|
|
|
typedef enum zap_flags {
|
|
/* Use 64-bit hash value (serialized cursors will always use 64-bits) */
|
|
ZAP_FLAG_HASH64 = 1 << 0,
|
|
/* Key is binary, not string (zap_add_uint64() can be used) */
|
|
ZAP_FLAG_UINT64_KEY = 1 << 1,
|
|
/*
|
|
* First word of key (which must be an array of uint64) is
|
|
* already randomly distributed.
|
|
*/
|
|
ZAP_FLAG_PRE_HASHED_KEY = 1 << 2,
|
|
} zap_flags_t;
|
|
|
|
/*
|
|
* Create a new zapobj with no attributes and return its object number.
|
|
*/
|
|
uint64_t zap_create(objset_t *ds, dmu_object_type_t ot,
|
|
dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
|
|
uint64_t zap_create_dnsize(objset_t *ds, dmu_object_type_t ot,
|
|
dmu_object_type_t bonustype, int bonuslen, int dnodesize, dmu_tx_t *tx);
|
|
uint64_t zap_create_norm(objset_t *ds, int normflags, dmu_object_type_t ot,
|
|
dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
|
|
uint64_t zap_create_norm_dnsize(objset_t *ds, int normflags,
|
|
dmu_object_type_t ot, dmu_object_type_t bonustype, int bonuslen,
|
|
int dnodesize, dmu_tx_t *tx);
|
|
uint64_t zap_create_flags(objset_t *os, int normflags, zap_flags_t flags,
|
|
dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift,
|
|
dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
|
|
uint64_t zap_create_flags_dnsize(objset_t *os, int normflags,
|
|
zap_flags_t flags, dmu_object_type_t ot, int leaf_blockshift,
|
|
int indirect_blockshift, dmu_object_type_t bonustype, int bonuslen,
|
|
int dnodesize, dmu_tx_t *tx);
|
|
uint64_t zap_create_hold(objset_t *os, int normflags, zap_flags_t flags,
|
|
dmu_object_type_t ot, int leaf_blockshift, int indirect_blockshift,
|
|
dmu_object_type_t bonustype, int bonuslen, int dnodesize,
|
|
dnode_t **allocated_dnode, void *tag, dmu_tx_t *tx);
|
|
|
|
uint64_t zap_create_link(objset_t *os, dmu_object_type_t ot,
|
|
uint64_t parent_obj, const char *name, dmu_tx_t *tx);
|
|
uint64_t zap_create_link_dnsize(objset_t *os, dmu_object_type_t ot,
|
|
uint64_t parent_obj, const char *name, int dnodesize, dmu_tx_t *tx);
|
|
|
|
/*
|
|
* Initialize an already-allocated object.
|
|
*/
|
|
void mzap_create_impl(dnode_t *dn, int normflags, zap_flags_t flags,
|
|
dmu_tx_t *tx);
|
|
|
|
/*
|
|
* Create a new zapobj with no attributes from the given (unallocated)
|
|
* object number.
|
|
*/
|
|
int zap_create_claim(objset_t *ds, uint64_t obj, dmu_object_type_t ot,
|
|
dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
|
|
int zap_create_claim_dnsize(objset_t *ds, uint64_t obj, dmu_object_type_t ot,
|
|
dmu_object_type_t bonustype, int bonuslen, int dnodesize, dmu_tx_t *tx);
|
|
int zap_create_claim_norm(objset_t *ds, uint64_t obj,
|
|
int normflags, dmu_object_type_t ot,
|
|
dmu_object_type_t bonustype, int bonuslen, dmu_tx_t *tx);
|
|
int zap_create_claim_norm_dnsize(objset_t *ds, uint64_t obj,
|
|
int normflags, dmu_object_type_t ot,
|
|
dmu_object_type_t bonustype, int bonuslen, int dnodesize, dmu_tx_t *tx);
|
|
|
|
/*
|
|
* The zapobj passed in must be a valid ZAP object for all of the
|
|
* following routines.
|
|
*/
|
|
|
|
/*
|
|
* Destroy this zapobj and all its attributes.
|
|
*
|
|
* Frees the object number using dmu_object_free.
|
|
*/
|
|
int zap_destroy(objset_t *ds, uint64_t zapobj, dmu_tx_t *tx);
|
|
|
|
/*
|
|
* Manipulate attributes.
|
|
*
|
|
* 'integer_size' is in bytes, and must be 1, 2, 4, or 8.
|
|
*/
|
|
|
|
/*
|
|
* Retrieve the contents of the attribute with the given name.
|
|
*
|
|
* If the requested attribute does not exist, the call will fail and
|
|
* return ENOENT.
|
|
*
|
|
* If 'integer_size' is smaller than the attribute's integer size, the
|
|
* call will fail and return EINVAL.
|
|
*
|
|
* If 'integer_size' is equal to or larger than the attribute's integer
|
|
* size, the call will succeed and return 0.
|
|
*
|
|
* When converting to a larger integer size, the integers will be treated as
|
|
* unsigned (ie. no sign-extension will be performed).
|
|
*
|
|
* 'num_integers' is the length (in integers) of 'buf'.
|
|
*
|
|
* If the attribute is longer than the buffer, as many integers as will
|
|
* fit will be transferred to 'buf'. If the entire attribute was not
|
|
* transferred, the call will return EOVERFLOW.
|
|
*/
|
|
int zap_lookup(objset_t *ds, uint64_t zapobj, const char *name,
|
|
uint64_t integer_size, uint64_t num_integers, void *buf);
|
|
|
|
/*
|
|
* If rn_len is nonzero, realname will be set to the name of the found
|
|
* entry (which may be different from the requested name if matchtype is
|
|
* not MT_EXACT).
|
|
*
|
|
* If normalization_conflictp is not NULL, it will be set if there is
|
|
* another name with the same case/unicode normalized form.
|
|
*/
|
|
int zap_lookup_norm(objset_t *ds, uint64_t zapobj, const char *name,
|
|
uint64_t integer_size, uint64_t num_integers, void *buf,
|
|
matchtype_t mt, char *realname, int rn_len,
|
|
boolean_t *normalization_conflictp);
|
|
int zap_lookup_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
|
|
int key_numints, uint64_t integer_size, uint64_t num_integers, void *buf);
|
|
int zap_contains(objset_t *ds, uint64_t zapobj, const char *name);
|
|
int zap_prefetch(objset_t *os, uint64_t zapobj, const char *name);
|
|
int zap_prefetch_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
|
|
int key_numints);
|
|
|
|
int zap_lookup_by_dnode(dnode_t *dn, const char *name,
|
|
uint64_t integer_size, uint64_t num_integers, void *buf);
|
|
int zap_lookup_norm_by_dnode(dnode_t *dn, const char *name,
|
|
uint64_t integer_size, uint64_t num_integers, void *buf,
|
|
matchtype_t mt, char *realname, int rn_len,
|
|
boolean_t *ncp);
|
|
|
|
int zap_count_write_by_dnode(dnode_t *dn, const char *name,
|
|
int add, zfs_refcount_t *towrite, zfs_refcount_t *tooverwrite);
|
|
|
|
/*
|
|
* Create an attribute with the given name and value.
|
|
*
|
|
* If an attribute with the given name already exists, the call will
|
|
* fail and return EEXIST.
|
|
*/
|
|
int zap_add(objset_t *ds, uint64_t zapobj, const char *key,
|
|
int integer_size, uint64_t num_integers,
|
|
const void *val, dmu_tx_t *tx);
|
|
int zap_add_by_dnode(dnode_t *dn, const char *key,
|
|
int integer_size, uint64_t num_integers,
|
|
const void *val, dmu_tx_t *tx);
|
|
int zap_add_uint64(objset_t *ds, uint64_t zapobj, const uint64_t *key,
|
|
int key_numints, int integer_size, uint64_t num_integers,
|
|
const void *val, dmu_tx_t *tx);
|
|
|
|
/*
|
|
* Set the attribute with the given name to the given value. If an
|
|
* attribute with the given name does not exist, it will be created. If
|
|
* an attribute with the given name already exists, the previous value
|
|
* will be overwritten. The integer_size may be different from the
|
|
* existing attribute's integer size, in which case the attribute's
|
|
* integer size will be updated to the new value.
|
|
*/
|
|
int zap_update(objset_t *ds, uint64_t zapobj, const char *name,
|
|
int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx);
|
|
int zap_update_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
|
|
int key_numints,
|
|
int integer_size, uint64_t num_integers, const void *val, dmu_tx_t *tx);
|
|
|
|
/*
|
|
* Get the length (in integers) and the integer size of the specified
|
|
* attribute.
|
|
*
|
|
* If the requested attribute does not exist, the call will fail and
|
|
* return ENOENT.
|
|
*/
|
|
int zap_length(objset_t *ds, uint64_t zapobj, const char *name,
|
|
uint64_t *integer_size, uint64_t *num_integers);
|
|
int zap_length_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
|
|
int key_numints, uint64_t *integer_size, uint64_t *num_integers);
|
|
|
|
/*
|
|
* Remove the specified attribute.
|
|
*
|
|
* If the specified attribute does not exist, the call will fail and
|
|
* return ENOENT.
|
|
*/
|
|
int zap_remove(objset_t *ds, uint64_t zapobj, const char *name, dmu_tx_t *tx);
|
|
int zap_remove_norm(objset_t *ds, uint64_t zapobj, const char *name,
|
|
matchtype_t mt, dmu_tx_t *tx);
|
|
int zap_remove_by_dnode(dnode_t *dn, const char *name, dmu_tx_t *tx);
|
|
int zap_remove_uint64(objset_t *os, uint64_t zapobj, const uint64_t *key,
|
|
int key_numints, dmu_tx_t *tx);
|
|
|
|
/*
|
|
* Returns (in *count) the number of attributes in the specified zap
|
|
* object.
|
|
*/
|
|
int zap_count(objset_t *ds, uint64_t zapobj, uint64_t *count);
|
|
|
|
/*
|
|
* Returns (in name) the name of the entry whose (value & mask)
|
|
* (za_first_integer) is value, or ENOENT if not found. The string
|
|
* pointed to by name must be at least 256 bytes long. If mask==0, the
|
|
* match must be exact (ie, same as mask=-1ULL).
|
|
*/
|
|
int zap_value_search(objset_t *os, uint64_t zapobj,
|
|
uint64_t value, uint64_t mask, char *name);
|
|
|
|
/*
|
|
* Transfer all the entries from fromobj into intoobj. Only works on
|
|
* int_size=8 num_integers=1 values. Fails if there are any duplicated
|
|
* entries.
|
|
*/
|
|
int zap_join(objset_t *os, uint64_t fromobj, uint64_t intoobj, dmu_tx_t *tx);
|
|
|
|
/* Same as zap_join, but set the values to 'value'. */
|
|
int zap_join_key(objset_t *os, uint64_t fromobj, uint64_t intoobj,
|
|
uint64_t value, dmu_tx_t *tx);
|
|
|
|
/* Same as zap_join, but add together any duplicated entries. */
|
|
int zap_join_increment(objset_t *os, uint64_t fromobj, uint64_t intoobj,
|
|
dmu_tx_t *tx);
|
|
|
|
/*
|
|
* Manipulate entries where the name + value are the "same" (the name is
|
|
* a stringified version of the value).
|
|
*/
|
|
int zap_add_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx);
|
|
int zap_remove_int(objset_t *os, uint64_t obj, uint64_t value, dmu_tx_t *tx);
|
|
int zap_lookup_int(objset_t *os, uint64_t obj, uint64_t value);
|
|
int zap_increment_int(objset_t *os, uint64_t obj, uint64_t key, int64_t delta,
|
|
dmu_tx_t *tx);
|
|
|
|
/* Here the key is an int and the value is a different int. */
|
|
int zap_add_int_key(objset_t *os, uint64_t obj,
|
|
uint64_t key, uint64_t value, dmu_tx_t *tx);
|
|
int zap_update_int_key(objset_t *os, uint64_t obj,
|
|
uint64_t key, uint64_t value, dmu_tx_t *tx);
|
|
int zap_lookup_int_key(objset_t *os, uint64_t obj,
|
|
uint64_t key, uint64_t *valuep);
|
|
|
|
int zap_increment(objset_t *os, uint64_t obj, const char *name, int64_t delta,
|
|
dmu_tx_t *tx);
|
|
|
|
struct zap;
|
|
struct zap_leaf;
|
|
typedef struct zap_cursor {
|
|
/* This structure is opaque! */
|
|
objset_t *zc_objset;
|
|
struct zap *zc_zap;
|
|
struct zap_leaf *zc_leaf;
|
|
uint64_t zc_zapobj;
|
|
uint64_t zc_serialized;
|
|
uint64_t zc_hash;
|
|
uint32_t zc_cd;
|
|
} zap_cursor_t;
|
|
|
|
typedef struct {
|
|
int za_integer_length;
|
|
/*
|
|
* za_normalization_conflict will be set if there are additional
|
|
* entries with this normalized form (eg, "foo" and "Foo").
|
|
*/
|
|
boolean_t za_normalization_conflict;
|
|
uint64_t za_num_integers;
|
|
uint64_t za_first_integer; /* no sign extension for <8byte ints */
|
|
char za_name[ZAP_MAXNAMELEN];
|
|
} zap_attribute_t;
|
|
|
|
/*
|
|
* The interface for listing all the attributes of a zapobj can be
|
|
* thought of as cursor moving down a list of the attributes one by
|
|
* one. The cookie returned by the zap_cursor_serialize routine is
|
|
* persistent across system calls (and across reboot, even).
|
|
*/
|
|
|
|
/*
|
|
* Initialize a zap cursor, pointing to the "first" attribute of the
|
|
* zapobj. You must _fini the cursor when you are done with it.
|
|
*/
|
|
void zap_cursor_init(zap_cursor_t *zc, objset_t *ds, uint64_t zapobj);
|
|
void zap_cursor_fini(zap_cursor_t *zc);
|
|
|
|
/*
|
|
* Get the attribute currently pointed to by the cursor. Returns
|
|
* ENOENT if at the end of the attributes.
|
|
*/
|
|
int zap_cursor_retrieve(zap_cursor_t *zc, zap_attribute_t *za);
|
|
|
|
/*
|
|
* Advance the cursor to the next attribute.
|
|
*/
|
|
void zap_cursor_advance(zap_cursor_t *zc);
|
|
|
|
/*
|
|
* Get a persistent cookie pointing to the current position of the zap
|
|
* cursor. The low 4 bits in the cookie are always zero, and thus can
|
|
* be used as to differentiate a serialized cookie from a different type
|
|
* of value. The cookie will be less than 2^32 as long as there are
|
|
* fewer than 2^22 (4.2 million) entries in the zap object.
|
|
*/
|
|
uint64_t zap_cursor_serialize(zap_cursor_t *zc);
|
|
|
|
/*
|
|
* Initialize a zap cursor pointing to the position recorded by
|
|
* zap_cursor_serialize (in the "serialized" argument). You can also
|
|
* use a "serialized" argument of 0 to start at the beginning of the
|
|
* zapobj (ie. zap_cursor_init_serialized(..., 0) is equivalent to
|
|
* zap_cursor_init(...).)
|
|
*/
|
|
void zap_cursor_init_serialized(zap_cursor_t *zc, objset_t *ds,
|
|
uint64_t zapobj, uint64_t serialized);
|
|
|
|
|
|
#define ZAP_HISTOGRAM_SIZE 10
|
|
|
|
typedef struct zap_stats {
|
|
/*
|
|
* Size of the pointer table (in number of entries).
|
|
* This is always a power of 2, or zero if it's a microzap.
|
|
* In general, it should be considerably greater than zs_num_leafs.
|
|
*/
|
|
uint64_t zs_ptrtbl_len;
|
|
|
|
uint64_t zs_blocksize; /* size of zap blocks */
|
|
|
|
/*
|
|
* The number of blocks used. Note that some blocks may be
|
|
* wasted because old ptrtbl's and large name/value blocks are
|
|
* not reused. (Although their space is reclaimed, we don't
|
|
* reuse those offsets in the object.)
|
|
*/
|
|
uint64_t zs_num_blocks;
|
|
|
|
/*
|
|
* Pointer table values from zap_ptrtbl in the zap_phys_t
|
|
*/
|
|
uint64_t zs_ptrtbl_nextblk; /* next (larger) copy start block */
|
|
uint64_t zs_ptrtbl_blks_copied; /* number source blocks copied */
|
|
uint64_t zs_ptrtbl_zt_blk; /* starting block number */
|
|
uint64_t zs_ptrtbl_zt_numblks; /* number of blocks */
|
|
uint64_t zs_ptrtbl_zt_shift; /* bits to index it */
|
|
|
|
/*
|
|
* Values of the other members of the zap_phys_t
|
|
*/
|
|
uint64_t zs_block_type; /* ZBT_HEADER */
|
|
uint64_t zs_magic; /* ZAP_MAGIC */
|
|
uint64_t zs_num_leafs; /* The number of leaf blocks */
|
|
uint64_t zs_num_entries; /* The number of zap entries */
|
|
uint64_t zs_salt; /* salt to stir into hash function */
|
|
|
|
/*
|
|
* Histograms. For all histograms, the last index
|
|
* (ZAP_HISTOGRAM_SIZE-1) includes any values which are greater
|
|
* than what can be represented. For example
|
|
* zs_leafs_with_n5_entries[ZAP_HISTOGRAM_SIZE-1] is the number
|
|
* of leafs with more than 45 entries.
|
|
*/
|
|
|
|
/*
|
|
* zs_leafs_with_n_pointers[n] is the number of leafs with
|
|
* 2^n pointers to it.
|
|
*/
|
|
uint64_t zs_leafs_with_2n_pointers[ZAP_HISTOGRAM_SIZE];
|
|
|
|
/*
|
|
* zs_leafs_with_n_entries[n] is the number of leafs with
|
|
* [n*5, (n+1)*5) entries. In the current implementation, there
|
|
* can be at most 55 entries in any block, but there may be
|
|
* fewer if the name or value is large, or the block is not
|
|
* completely full.
|
|
*/
|
|
uint64_t zs_blocks_with_n5_entries[ZAP_HISTOGRAM_SIZE];
|
|
|
|
/*
|
|
* zs_leafs_n_tenths_full[n] is the number of leafs whose
|
|
* fullness is in the range [n/10, (n+1)/10).
|
|
*/
|
|
uint64_t zs_blocks_n_tenths_full[ZAP_HISTOGRAM_SIZE];
|
|
|
|
/*
|
|
* zs_entries_using_n_chunks[n] is the number of entries which
|
|
* consume n 24-byte chunks. (Note, large names/values only use
|
|
* one chunk, but contribute to zs_num_blocks_large.)
|
|
*/
|
|
uint64_t zs_entries_using_n_chunks[ZAP_HISTOGRAM_SIZE];
|
|
|
|
/*
|
|
* zs_buckets_with_n_entries[n] is the number of buckets (each
|
|
* leaf has 64 buckets) with n entries.
|
|
* zs_buckets_with_n_entries[1] should be very close to
|
|
* zs_num_entries.
|
|
*/
|
|
uint64_t zs_buckets_with_n_entries[ZAP_HISTOGRAM_SIZE];
|
|
} zap_stats_t;
|
|
|
|
/*
|
|
* Get statistics about a ZAP object. Note: you need to be aware of the
|
|
* internal implementation of the ZAP to correctly interpret some of the
|
|
* statistics. This interface shouldn't be relied on unless you really
|
|
* know what you're doing.
|
|
*/
|
|
int zap_get_stats(objset_t *ds, uint64_t zapobj, zap_stats_t *zs);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _SYS_ZAP_H */
|