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Add visibility in to cached dbufs

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Currently there is no mechanism to inspect which dbufs are being
cached by the system.  There are some coarse counters in arcstats
by they only give a rough idea of what's being cached.  This patch
aims to improve the current situation by adding a new dbufs kstat.

When read this new kstat will walk all cached dbufs linked in to
the dbuf_hash.  For each dbuf it will dump detailed information
about the buffer.  It will also dump additional information about
the referenced arc buffer and its related dnode.  This provides a
more complete view in to exactly what is being cached.

With this generic infrastructure in place utilities can be written
to post-process the data to understand exactly how the caching is
working.  For example, the data could be processed to show a list
of all cached dnodes and how much space they're consuming.  Or a
similar list could be generated based on dnode type.  Many other
ways to interpret the data exist based on what kinds of questions
you're trying to answer.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Prakash Surya <surya1@llnl.gov>
This commit is contained in:
Brian Behlendorf 2013-10-02 17:11:19 -07:00
parent 2d37239a28
commit e0b0ca983d
9 changed files with 368 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
include/sys/arc.h
View File

@ -92,6 +92,36 @@ typedef enum arc_space_type {
ARC_SPACE_NUMTYPES
} arc_space_type_t;
typedef enum arc_state_type {
ARC_STATE_ANON,
ARC_STATE_MRU,
ARC_STATE_MRU_GHOST,
ARC_STATE_MFU,
ARC_STATE_MFU_GHOST,
ARC_STATE_L2C_ONLY,
ARC_STATE_NUMTYPES
} arc_state_type_t;
typedef struct arc_buf_info {
arc_state_type_t abi_state_type;
arc_buf_contents_t abi_state_contents;
uint64_t abi_state_index;
uint32_t abi_flags;
uint32_t abi_datacnt;
uint64_t abi_size;
uint64_t abi_spa;
uint64_t abi_access;
uint32_t abi_mru_hits;
uint32_t abi_mru_ghost_hits;
uint32_t abi_mfu_hits;
uint32_t abi_mfu_ghost_hits;
uint32_t abi_l2arc_hits;
uint32_t abi_holds;
uint64_t abi_l2arc_dattr;
uint64_t abi_l2arc_asize;
enum zio_compress abi_l2arc_compress;
} arc_buf_info_t;
void arc_space_consume(uint64_t space, arc_space_type_t type);
void arc_space_return(uint64_t space, arc_space_type_t type);
arc_buf_t *arc_buf_alloc(spa_t *spa, int size, void *tag,
@ -101,6 +131,7 @@ void arc_return_buf(arc_buf_t *buf, void *tag);
void arc_loan_inuse_buf(arc_buf_t *buf, void *tag);
void arc_buf_add_ref(arc_buf_t *buf, void *tag);
boolean_t arc_buf_remove_ref(arc_buf_t *buf, void *tag);
void arc_buf_info(arc_buf_t *buf, arc_buf_info_t *abi, int state_index);
int arc_buf_size(arc_buf_t *buf);
void arc_release(arc_buf_t *buf, void *tag);
int arc_released(arc_buf_t *buf);

3
include/sys/dbuf.h
View File

@ -282,6 +282,9 @@ void dbuf_free_range(struct dnode *dn, uint64_t start, uint64_t end,
void dbuf_new_size(dmu_buf_impl_t *db, int size, dmu_tx_t *tx);
void dbuf_stats_init(dbuf_hash_table_t *hash);
void dbuf_stats_destroy(void);
#define DB_DNODE(_db) ((_db)->db_dnode_handle->dnh_dnode)
#define DB_DNODE_LOCK(_db) ((_db)->db_dnode_handle->dnh_zrlock)
#define DB_DNODE_ENTER(_db) (zrl_add(&DB_DNODE_LOCK(_db)))

1
include/sys/dmu.h
View File

@ -660,6 +660,7 @@ extern const dmu_object_byteswap_info_t dmu_ot_byteswap[DMU_BSWAP_NUMFUNCS];
* 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_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,

1
lib/libzpool/Makefile.am
View File

@ -25,6 +25,7 @@ libzpool_la_SOURCES = \
$(top_srcdir)/module/zfs/bpobj.c \
$(top_srcdir)/module/zfs/bptree.c \
$(top_srcdir)/module/zfs/dbuf.c \
$(top_srcdir)/module/zfs/dbuf_stats.c \
$(top_srcdir)/module/zfs/ddt.c \
$(top_srcdir)/module/zfs/ddt_zap.c \
$(top_srcdir)/module/zfs/dmu.c \

1
module/zfs/Makefile.in
View File

@ -8,6 +8,7 @@ $(MODULE)-objs += @top_srcdir@/module/zfs/arc.o
$(MODULE)-objs += @top_srcdir@/module/zfs/bplist.o
$(MODULE)-objs += @top_srcdir@/module/zfs/bpobj.o
$(MODULE)-objs += @top_srcdir@/module/zfs/dbuf.o
$(MODULE)-objs += @top_srcdir@/module/zfs/dbuf_stats.o
$(MODULE)-objs += @top_srcdir@/module/zfs/bptree.o
$(MODULE)-objs += @top_srcdir@/module/zfs/ddt.o
$(MODULE)-objs += @top_srcdir@/module/zfs/ddt_zap.o

87
module/zfs/arc.c
View File

@ -232,6 +232,7 @@ typedef struct arc_state {
uint64_t arcs_lsize[ARC_BUFC_NUMTYPES]; /* amount of evictable data */
uint64_t arcs_size; /* total amount of data in this state */
kmutex_t arcs_mtx;
arc_state_type_t arcs_state;
} arc_state_t;
/* The 6 states: */
@ -534,6 +535,11 @@ struct arc_buf_hdr {
/* updated atomically */
clock_t b_arc_access;
uint32_t b_mru_hits;
uint32_t b_mru_ghost_hits;
uint32_t b_mfu_hits;
uint32_t b_mfu_ghost_hits;
uint32_t b_l2_hits;
/* self protecting */
refcount_t b_refcnt;
@ -709,7 +715,8 @@ struct l2arc_buf_hdr {
/* compression applied to buffer data */
enum zio_compress b_compress;
/* real alloc'd buffer size depending on b_compress applied */
int b_asize;
uint32_t b_asize;
uint32_t b_hits;
/* temporary buffer holder for in-flight compressed data */
void *b_tmp_cdata;
};
@ -1137,6 +1144,54 @@ remove_reference(arc_buf_hdr_t *ab, kmutex_t *hash_lock, void *tag)
return (cnt);
}
/*
* Returns detailed information about a specific arc buffer. When the
* state_index argument is set the function will calculate the arc header
* list position for its arc state. Since this requires a linear traversal
* callers are strongly encourage not to do this. However, it can be helpful
* for targeted analysis so the functionality is provided.
*/
void
arc_buf_info(arc_buf_t *ab, arc_buf_info_t *abi, int state_index)
{
arc_buf_hdr_t *hdr = ab->b_hdr;
arc_state_t *state = hdr->b_state;
memset(abi, 0, sizeof(arc_buf_info_t));
abi->abi_flags = hdr->b_flags;
abi->abi_datacnt = hdr->b_datacnt;
abi->abi_state_type = state ? state->arcs_state : ARC_STATE_ANON;
abi->abi_state_contents = hdr->b_type;
abi->abi_state_index = -1;
abi->abi_size = hdr->b_size;
abi->abi_access = hdr->b_arc_access;
abi->abi_mru_hits = hdr->b_mru_hits;
abi->abi_mru_ghost_hits = hdr->b_mru_ghost_hits;
abi->abi_mfu_hits = hdr->b_mfu_hits;
abi->abi_mfu_ghost_hits = hdr->b_mfu_ghost_hits;
abi->abi_holds = refcount_count(&hdr->b_refcnt);
if (hdr->b_l2hdr) {
abi->abi_l2arc_dattr = hdr->b_l2hdr->b_daddr;
abi->abi_l2arc_asize = hdr->b_l2hdr->b_asize;
abi->abi_l2arc_compress = hdr->b_l2hdr->b_compress;
abi->abi_l2arc_hits = hdr->b_l2hdr->b_hits;
}
if (state && state_index && list_link_active(&hdr->b_arc_node)) {
list_t *list = &state->arcs_list[hdr->b_type];
arc_buf_hdr_t *h;
mutex_enter(&state->arcs_mtx);
for (h = list_head(list); h != NULL; h = list_next(list, h)) {
abi->abi_state_index++;
if (h == hdr)
break;
}
mutex_exit(&state->arcs_mtx);
}
}
/*
* Move the supplied buffer to the indicated state. The mutex
* for the buffer must be held by the caller.
@ -1298,6 +1353,11 @@ arc_buf_alloc(spa_t *spa, int size, void *tag, arc_buf_contents_t type)
hdr->b_spa = spa_load_guid(spa);
hdr->b_state = arc_anon;
hdr->b_arc_access = 0;
hdr->b_mru_hits = 0;
hdr->b_mru_ghost_hits = 0;
hdr->b_mfu_hits = 0;
hdr->b_mfu_ghost_hits = 0;
hdr->b_l2_hits = 0;
buf = kmem_cache_alloc(buf_cache, KM_PUSHPAGE);
buf->b_hdr = hdr;
buf->b_data = NULL;
@ -2670,6 +2730,7 @@ arc_access(arc_buf_hdr_t *buf, kmutex_t *hash_lock)
ASSERT(list_link_active(&buf->b_arc_node));
} else {
buf->b_flags &= ~ARC_PREFETCH;
atomic_inc_32(&buf->b_mru_hits);
ARCSTAT_BUMP(arcstat_mru_hits);
}
buf->b_arc_access = now;
@ -2691,6 +2752,7 @@ arc_access(arc_buf_hdr_t *buf, kmutex_t *hash_lock)
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, buf);
arc_change_state(arc_mfu, buf, hash_lock);
}
atomic_inc_32(&buf->b_mru_hits);
ARCSTAT_BUMP(arcstat_mru_hits);
} else if (buf->b_state == arc_mru_ghost) {
arc_state_t *new_state;
@ -2713,6 +2775,7 @@ arc_access(arc_buf_hdr_t *buf, kmutex_t *hash_lock)
buf->b_arc_access = ddi_get_lbolt();
arc_change_state(new_state, buf, hash_lock);
atomic_inc_32(&buf->b_mru_ghost_hits);
ARCSTAT_BUMP(arcstat_mru_ghost_hits);
} else if (buf->b_state == arc_mfu) {
/*
@ -2728,6 +2791,7 @@ arc_access(arc_buf_hdr_t *buf, kmutex_t *hash_lock)
ASSERT(refcount_count(&buf->b_refcnt) == 0);
ASSERT(list_link_active(&buf->b_arc_node));
}
atomic_inc_32(&buf->b_mfu_hits);
ARCSTAT_BUMP(arcstat_mfu_hits);
buf->b_arc_access = ddi_get_lbolt();
} else if (buf->b_state == arc_mfu_ghost) {
@ -2751,6 +2815,7 @@ arc_access(arc_buf_hdr_t *buf, kmutex_t *hash_lock)
DTRACE_PROBE1(new_state__mfu, arc_buf_hdr_t *, buf);
arc_change_state(new_state, buf, hash_lock);
atomic_inc_32(&buf->b_mfu_ghost_hits);
ARCSTAT_BUMP(arcstat_mfu_ghost_hits);
} else if (buf->b_state == arc_l2c_only) {
/*
@ -3134,6 +3199,7 @@ arc_read(zio_t *pio, spa_t *spa, const blkptr_t *bp, arc_done_func_t *done,
DTRACE_PROBE1(l2arc__hit, arc_buf_hdr_t *, hdr);
ARCSTAT_BUMP(arcstat_l2_hits);
atomic_inc_32(&hdr->b_l2hdr->b_hits);
cb = kmem_zalloc(sizeof (l2arc_read_callback_t),
KM_PUSHPAGE);
@ -3469,6 +3535,11 @@ arc_release(arc_buf_t *buf, void *tag)
nhdr->b_buf = buf;
nhdr->b_state = arc_anon;
nhdr->b_arc_access = 0;
nhdr->b_mru_hits = 0;
nhdr->b_mru_ghost_hits = 0;
nhdr->b_mfu_hits = 0;
nhdr->b_mfu_ghost_hits = 0;
nhdr->b_l2_hits = 0;
nhdr->b_flags = flags & ARC_L2_WRITING;
nhdr->b_l2hdr = NULL;
nhdr->b_datacnt = 1;
@ -3485,6 +3556,11 @@ arc_release(arc_buf_t *buf, void *tag)
if (hdr->b_state != arc_anon)
arc_change_state(arc_anon, hdr, hash_lock);
hdr->b_arc_access = 0;
hdr->b_mru_hits = 0;
hdr->b_mru_ghost_hits = 0;
hdr->b_mfu_hits = 0;
hdr->b_mfu_ghost_hits = 0;
hdr->b_l2_hits = 0;
if (hash_lock)
mutex_exit(hash_lock);
@ -3902,6 +3978,13 @@ arc_init(void)
list_create(&arc_l2c_only->arcs_list[ARC_BUFC_DATA],
sizeof (arc_buf_hdr_t), offsetof(arc_buf_hdr_t, b_arc_node));
arc_anon->arcs_state = ARC_STATE_ANON;
arc_mru->arcs_state = ARC_STATE_MRU;
arc_mru_ghost->arcs_state = ARC_STATE_MRU_GHOST;
arc_mfu->arcs_state = ARC_STATE_MFU;
arc_mfu_ghost->arcs_state = ARC_STATE_MFU_GHOST;
arc_l2c_only->arcs_state = ARC_STATE_L2C_ONLY;
buf_init();
arc_thread_exit = 0;
@ -4785,6 +4868,7 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz,
l2hdr->b_compress = ZIO_COMPRESS_OFF;
l2hdr->b_asize = ab->b_size;
l2hdr->b_tmp_cdata = ab->b_buf->b_data;
l2hdr->b_hits = 0;
buf_sz = ab->b_size;
ab->b_l2hdr = l2hdr;
@ -5317,6 +5401,7 @@ l2arc_stop(void)
#if defined(_KERNEL) && defined(HAVE_SPL)
EXPORT_SYMBOL(arc_read);
EXPORT_SYMBOL(arc_buf_remove_ref);
EXPORT_SYMBOL(arc_buf_info);
EXPORT_SYMBOL(arc_getbuf_func);
EXPORT_SYMBOL(arc_add_prune_callback);
EXPORT_SYMBOL(arc_remove_prune_callback);

4
module/zfs/dbuf.c
View File

@ -317,6 +317,8 @@ dbuf_init(void)
for (i = 0; i < DBUF_MUTEXES; i++)
mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL);
dbuf_stats_init(h);
}
void
@ -325,6 +327,8 @@ dbuf_fini(void)
dbuf_hash_table_t *h = &dbuf_hash_table;
int i;
dbuf_stats_destroy();
for (i = 0; i < DBUF_MUTEXES; i++)
mutex_destroy(&h->hash_mutexes[i]);
#if defined(_KERNEL) && defined(HAVE_SPL)

230
module/zfs/dbuf_stats.c Normal file
View File

@ -0,0 +1,230 @@
/*
* 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
*/
#include <sys/zfs_context.h>
#include <sys/dbuf.h>
#include <sys/dmu_objset.h>
/*
* Calculate the index of the arc header for the state, disabled by default.
*/
int zfs_dbuf_state_index = 0;
/*
* ==========================================================================
* Dbuf Hash Read Routines
* ==========================================================================
*/
typedef struct dbuf_stats_t {
kmutex_t lock;
kstat_t *kstat;
dbuf_hash_table_t *hash;
int idx;
} dbuf_stats_t;
static dbuf_stats_t dbuf_stats_hash_table;
static int
dbuf_stats_hash_table_headers(char *buf, size_t size)
{
size = snprintf(buf, size - 1,
"%-88s | %-124s | %s\n"
"%-16s %-8s %-8s %-8s %-8s %-8s %-8s %-5s %-5s %5s | "
"%-5s %-5s %-6s %-8s %-6s %-8s %-12s "
"%-6s %-6s %-6s %-6s %-6s %-8s %-8s %-8s %-5s | "
"%-6s %-6s %-8s %-8s %-6s %-6s %-5s %-8s %-8s\n",
"dbuf", "arcbuf", "dnode", "pool", "objset", "object", "level",
"blkid", "offset", "dbsize", "meta", "state", "dbholds", "list",
"atype", "index", "flags", "count", "asize", "access", "mru", "gmru",
"mfu", "gmfu", "l2", "l2_dattr", "l2_asize", "l2_comp", "aholds",
"dtype", "btype", "data_bs", "meta_bs", "bsize",
"lvls", "dholds", "blocks", "dsize");
buf[size] = '\0';
return (0);
}
int
__dbuf_stats_hash_table_data(char *buf, size_t size, dmu_buf_impl_t *db)
{
arc_buf_info_t abi = { 0 };
dmu_object_info_t doi = { 0 };
dnode_t *dn = DB_DNODE(db);
if (db->db_buf)
arc_buf_info(db->db_buf, &abi, zfs_dbuf_state_index);
if (dn)
__dmu_object_info_from_dnode(dn, &doi);
size = snprintf(buf, size - 1,
"%-16s %-8llu %-8lld %-8lld %-8lld %-8llu %-8llu %-5d %-5d %-5lu | "
"%-5d %-5d %-6lld 0x%-6x %-6lu %-8llu %-12llu "
"%-6lu %-6lu %-6lu %-6lu %-6lu %-8llu %-8llu %-8d %-5lu | "
"%-6d %-6d %-8lu %-8lu %-6llu %-6lu %-5lu %-8llu %-8llu\n",
/* dmu_buf_impl_t */
spa_name(dn->dn_objset->os_spa),
(u_longlong_t)dmu_objset_id(db->db_objset),
(longlong_t)db->db.db_object,
(longlong_t)db->db_level,
(longlong_t)db->db_blkid,
(u_longlong_t)db->db.db_offset,
(u_longlong_t)db->db.db_size,
!!dbuf_is_metadata(db),
db->db_state,
(ulong_t)refcount_count(&db->db_holds),
/* arc_buf_info_t */
abi.abi_state_type,
abi.abi_state_contents,
(longlong_t)abi.abi_state_index,
abi.abi_flags,
(ulong_t)abi.abi_datacnt,
(u_longlong_t)abi.abi_size,
(u_longlong_t)abi.abi_access,
(ulong_t)abi.abi_mru_hits,
(ulong_t)abi.abi_mru_ghost_hits,
(ulong_t)abi.abi_mfu_hits,
(ulong_t)abi.abi_mfu_ghost_hits,
(ulong_t)abi.abi_l2arc_hits,
(u_longlong_t)abi.abi_l2arc_dattr,
(u_longlong_t)abi.abi_l2arc_asize,
abi.abi_l2arc_compress,
(ulong_t)abi.abi_holds,
/* dmu_object_info_t */
doi.doi_type,
doi.doi_bonus_type,
(ulong_t)doi.doi_data_block_size,
(ulong_t)doi.doi_metadata_block_size,
(u_longlong_t)doi.doi_bonus_size,
(ulong_t)doi.doi_indirection,
(ulong_t)refcount_count(&dn->dn_holds),
(u_longlong_t)doi.doi_fill_count,
(u_longlong_t)doi.doi_max_offset);
buf[size] = '\0';
return (size);
}
static int
dbuf_stats_hash_table_data(char *buf, size_t size, void *data)
{
dbuf_stats_t *dsh = (dbuf_stats_t *)data;
dbuf_hash_table_t *h = dsh->hash;
dmu_buf_impl_t *db;
int length, error = 0;
ASSERT3S(dsh->idx, >=, 0);
ASSERT3S(dsh->idx, <=, h->hash_table_mask);
memset(buf, 0, size);
mutex_enter(DBUF_HASH_MUTEX(h, dsh->idx));
for (db = h->hash_table[dsh->idx]; db != NULL; db = db->db_hash_next) {
/*
* Returning ENOMEM will cause the data and header functions
* to be called with a larger scratch buffers.
*/
if (size < 512) {
error = ENOMEM;
break;
}
mutex_enter(&db->db_mtx);
mutex_exit(DBUF_HASH_MUTEX(h, dsh->idx));
length = __dbuf_stats_hash_table_data(buf, size, db);
buf += length;
size -= length;
mutex_exit(&db->db_mtx);
mutex_enter(DBUF_HASH_MUTEX(h, dsh->idx));
}
mutex_exit(DBUF_HASH_MUTEX(h, dsh->idx));
return (error);
}
static void *
dbuf_stats_hash_table_addr(kstat_t *ksp, loff_t n)
{
dbuf_stats_t *dsh = ksp->ks_private;
ASSERT(MUTEX_HELD(&dsh->lock));
if (n <= dsh->hash->hash_table_mask) {
dsh->idx = n;
return (dsh);
}
return (NULL);
}
static void
dbuf_stats_hash_table_init(dbuf_hash_table_t *hash)
{
dbuf_stats_t *dsh = &dbuf_stats_hash_table;
kstat_t *ksp;
mutex_init(&dsh->lock, NULL, MUTEX_DEFAULT, NULL);
dsh->hash = hash;
ksp = kstat_create("zfs", 0, "dbufs", "misc",
KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
dsh->kstat = ksp;
if (ksp) {
ksp->ks_lock = &dsh->lock;
ksp->ks_ndata = UINT32_MAX;
ksp->ks_private = dsh;
kstat_set_raw_ops(ksp, dbuf_stats_hash_table_headers,
dbuf_stats_hash_table_data, dbuf_stats_hash_table_addr);
kstat_install(ksp);
}
}
static void
dbuf_stats_hash_table_destroy(void)
{
dbuf_stats_t *dsh = &dbuf_stats_hash_table;
kstat_t *ksp;
ksp = dsh->kstat;
if (ksp)
kstat_delete(ksp);
mutex_destroy(&dsh->lock);
}
void
dbuf_stats_init(dbuf_hash_table_t *hash)
{
dbuf_stats_hash_table_init(hash);
}
void
dbuf_stats_destroy(void)
{
dbuf_stats_hash_table_destroy();
}
#if defined(_KERNEL) && defined(HAVE_SPL)
module_param(zfs_dbuf_state_index, int, 0644);
MODULE_PARM_DESC(zfs_dbuf_state_index, "Calculate arc header index");
#endif

18
module/zfs/dmu.c
View File

@ -1815,16 +1815,11 @@ dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
}
void
dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
__dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
{
dnode_phys_t *dnp;
dnode_phys_t *dnp = dn->dn_phys;
int i;
rw_enter(&dn->dn_struct_rwlock, RW_READER);
mutex_enter(&dn->dn_mtx);
dnp = dn->dn_phys;
doi->doi_data_block_size = dn->dn_datablksz;
doi->doi_metadata_block_size = dn->dn_indblkshift ?
1ULL << dn->dn_indblkshift : 0;
@ -1839,6 +1834,15 @@ dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
doi->doi_fill_count = 0;
for (i = 0; i < dnp->dn_nblkptr; i++)
doi->doi_fill_count += dnp->dn_blkptr[i].blk_fill;
}
void
dmu_object_info_from_dnode(dnode_t *dn, dmu_object_info_t *doi)
{
rw_enter(&dn->dn_struct_rwlock, RW_READER);
mutex_enter(&dn->dn_mtx);
__dmu_object_info_from_dnode(dn, doi);
mutex_exit(&dn->dn_mtx);
rw_exit(&dn->dn_struct_rwlock);