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Oct 29, 2025
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Pass flags to more DMU write/hold functions #17872

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15 changes: 10 additions & 5 deletions cmd/ztest.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2306,7 +2306,8 @@ ztest_replay_write(void *arg1, void *arg2, boolean_t byteswap)
}

if (abuf == NULL) {
dmu_write(os, lr->lr_foid, offset, length, data, tx);
dmu_write(os, lr->lr_foid, offset, length, data, tx,
DMU_READ_PREFETCH);
} else {
memcpy(abuf->b_data, data, length);
VERIFY0(dmu_assign_arcbuf_by_dbuf(db, offset, abuf, tx, 0));
Expand Down Expand Up @@ -5243,7 +5244,8 @@ ztest_dmu_read_write(ztest_ds_t *zd, uint64_t id)
* We've verified all the old bufwads, and made new ones.
* Now write them out.
*/
dmu_write(os, packobj, packoff, packsize, packbuf, tx);
dmu_write(os, packobj, packoff, packsize, packbuf, tx,
DMU_READ_PREFETCH);

if (freeit) {
if (ztest_opts.zo_verbose >= 7) {
Expand All @@ -5258,7 +5260,8 @@ ztest_dmu_read_write(ztest_ds_t *zd, uint64_t id)
" txg %"PRIx64"\n",
bigoff, bigsize, txg);
}
dmu_write(os, bigobj, bigoff, bigsize, bigbuf, tx);
dmu_write(os, bigobj, bigoff, bigsize, bigbuf, tx,
DMU_READ_PREFETCH);
}

dmu_tx_commit(tx);
Expand Down Expand Up @@ -5513,7 +5516,8 @@ ztest_dmu_read_write_zcopy(ztest_ds_t *zd, uint64_t id)
* We've verified all the old bufwads, and made new ones.
* Now write them out.
*/
dmu_write(os, packobj, packoff, packsize, packbuf, tx);
dmu_write(os, packobj, packoff, packsize, packbuf, tx,
DMU_READ_PREFETCH);
if (ztest_opts.zo_verbose >= 7) {
(void) printf("writing offset %"PRIx64" size %"PRIx64""
" txg %"PRIx64"\n",
Expand Down Expand Up @@ -6119,7 +6123,8 @@ ztest_dmu_commit_callbacks(ztest_ds_t *zd, uint64_t id)
"future leak: got %"PRIu64", open txg is %"PRIu64"",
old_txg, txg);

dmu_write(os, od->od_object, 0, sizeof (uint64_t), &txg, tx);
dmu_write(os, od->od_object, 0, sizeof (uint64_t), &txg, tx,
DMU_READ_PREFETCH);

(void) mutex_enter(&zcl.zcl_callbacks_lock);

Expand Down
6 changes: 3 additions & 3 deletions include/sys/dmu.h
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Original file line number Diff line number Diff line change
Expand Up @@ -625,7 +625,7 @@ int dmu_buf_hold(objset_t *os, uint64_t object, uint64_t offset,
const void *tag, dmu_buf_t **, dmu_flags_t flags);
int dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
uint64_t length, int read, const void *tag, int *numbufsp,
dmu_buf_t ***dbpp);
dmu_buf_t ***dbpp, dmu_flags_t flags);
int dmu_buf_hold_noread(objset_t *os, uint64_t object, uint64_t offset,
const void *tag, dmu_buf_t **dbp);
int dmu_buf_hold_by_dnode(dnode_t *dn, uint64_t offset,
Expand Down Expand Up @@ -668,7 +668,7 @@ uint64_t dmu_buf_user_refcount(dmu_buf_t *db);
*/
int dmu_buf_hold_array_by_bonus(dmu_buf_t *db, uint64_t offset,
uint64_t length, boolean_t read, const void *tag,
int *numbufsp, dmu_buf_t ***dbpp);
int *numbufsp, dmu_buf_t ***dbpp, dmu_flags_t flags);
void dmu_buf_rele_array(dmu_buf_t **, int numbufs, const void *tag);

typedef void dmu_buf_evict_func_t(void *user_ptr);
Expand Down Expand Up @@ -924,7 +924,7 @@ int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
int dmu_read_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size, void *buf,
dmu_flags_t flags);
void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
const void *buf, dmu_tx_t *tx);
const void *buf, dmu_tx_t *tx, dmu_flags_t flags);
int dmu_write_by_dnode(dnode_t *dn, uint64_t offset, uint64_t size,
const void *buf, dmu_tx_t *tx, dmu_flags_t flags);
void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
Expand Down
5 changes: 3 additions & 2 deletions module/os/freebsd/zfs/dmu_os.c
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Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,7 @@ dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
return (0);

err = dmu_buf_hold_array(os, object, offset, size,
FALSE, FTAG, &numbufs, &dbp);
FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH);
if (err)
return (err);

Expand Down Expand Up @@ -147,7 +147,8 @@ dmu_read_pages(objset_t *os, uint64_t object, vm_page_t *ma, int count,
ASSERT3S(last_size, <=, PAGE_SIZE);

err = dmu_buf_hold_array(os, object, IDX_TO_OFF(ma[0]->pindex),
IDX_TO_OFF(count - 1) + last_size, TRUE, FTAG, &numbufs, &dbp);
IDX_TO_OFF(count - 1) + last_size, TRUE, FTAG, &numbufs, &dbp,
DMU_READ_PREFETCH);
if (err != 0)
return (err);

Expand Down
3 changes: 2 additions & 1 deletion module/os/freebsd/zfs/zfs_acl.c
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Expand Up @@ -1262,7 +1262,8 @@ zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
if (aclnode->z_ace_count == 0)
continue;
dmu_write(zfsvfs->z_os, aoid, off,
aclnode->z_size, aclnode->z_acldata, tx);
aclnode->z_size, aclnode->z_acldata, tx,
DMU_READ_NO_PREFETCH);
off += aclnode->z_size;
}
} else {
Expand Down
3 changes: 2 additions & 1 deletion module/os/freebsd/zfs/zfs_vnops_os.c
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Expand Up @@ -4481,7 +4481,8 @@ zfs_putpages(struct vnode *vp, vm_page_t *ma, size_t len, int flags,
for (i = 0; wlen > 0; woff += tocopy, wlen -= tocopy, i++) {
tocopy = MIN(PAGE_SIZE, wlen);
va = zfs_map_page(ma[i], &sf);
dmu_write(zfsvfs->z_os, zp->z_id, woff, tocopy, va, tx);
dmu_write(zfsvfs->z_os, zp->z_id, woff, tocopy, va, tx,
DMU_READ_PREFETCH);
zfs_unmap_page(sf);
}
} else {
Expand Down
3 changes: 2 additions & 1 deletion module/os/linux/zfs/zfs_acl.c
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Expand Up @@ -1447,7 +1447,8 @@ zfs_aclset_common(znode_t *zp, zfs_acl_t *aclp, cred_t *cr, dmu_tx_t *tx)
if (aclnode->z_ace_count == 0)
continue;
dmu_write(zfsvfs->z_os, aoid, off,
aclnode->z_size, aclnode->z_acldata, tx);
aclnode->z_size, aclnode->z_acldata, tx,
DMU_READ_NO_PREFETCH);
off += aclnode->z_size;
}
} else {
Expand Down
3 changes: 2 additions & 1 deletion module/os/linux/zfs/zfs_vnops_os.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3892,7 +3892,8 @@ zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc,

va = kmap(pp);
ASSERT3U(pglen, <=, PAGE_SIZE);
dmu_write(zfsvfs->z_os, zp->z_id, pgoff, pglen, va, tx);
dmu_write(zfsvfs->z_os, zp->z_id, pgoff, pglen, va, tx,
DMU_READ_PREFETCH);
kunmap(pp);

SA_ADD_BULK_ATTR(bulk, cnt, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
Expand Down
7 changes: 4 additions & 3 deletions module/zfs/bpobj.c
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Expand Up @@ -752,7 +752,8 @@ bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
}
dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
numsubsub * sizeof (subobj), subdb->db_data, tx);
numsubsub * sizeof (subobj), subdb->db_data, tx,
DMU_READ_NO_PREFETCH);
dmu_buf_rele(subdb, FTAG);
bpo->bpo_phys->bpo_num_subobjs += numsubsub;

Expand All @@ -777,7 +778,7 @@ bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)
dmu_write(bpo->bpo_os, bpo->bpo_object,
bpo->bpo_phys->bpo_num_blkptrs * sizeof (blkptr_t),
numbps * sizeof (blkptr_t),
bps->db_data, tx);
bps->db_data, tx, DMU_READ_NO_PREFETCH);
dmu_buf_rele(bps, FTAG);
bpo->bpo_phys->bpo_num_blkptrs += numbps;

Expand All @@ -794,7 +795,7 @@ bpobj_enqueue_subobj(bpobj_t *bpo, uint64_t subobj, dmu_tx_t *tx)

dmu_write(bpo->bpo_os, bpo->bpo_phys->bpo_subobjs,
bpo->bpo_phys->bpo_num_subobjs * sizeof (subobj),
sizeof (subobj), &subobj, tx);
sizeof (subobj), &subobj, tx, DMU_READ_NO_PREFETCH);
bpo->bpo_phys->bpo_num_subobjs++;
}

Expand Down
9 changes: 6 additions & 3 deletions module/zfs/bptree.c
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,8 @@ bptree_add(objset_t *os, uint64_t obj, blkptr_t *bp, uint64_t birth_txg,
bte = kmem_zalloc(sizeof (*bte), KM_SLEEP);
bte->be_birth_txg = birth_txg;
bte->be_bp = *bp;
dmu_write(os, obj, bt->bt_end * sizeof (*bte), sizeof (*bte), bte, tx);
dmu_write(os, obj, bt->bt_end * sizeof (*bte), sizeof (*bte), bte, tx,
DMU_READ_NO_PREFETCH);
kmem_free(bte, sizeof (*bte));

dmu_buf_will_dirty(db, tx);
Expand Down Expand Up @@ -247,7 +248,8 @@ bptree_iterate(objset_t *os, uint64_t obj, boolean_t free, bptree_itor_t func,
ZB_DESTROYED_OBJSET);
ASSERT0(bte.be_zb.zb_level);
dmu_write(os, obj, i * sizeof (bte),
sizeof (bte), &bte, tx);
sizeof (bte), &bte, tx,
DMU_READ_NO_PREFETCH);
if (err == EIO || err == ECKSUM ||
err == ENXIO) {
/*
Expand All @@ -269,7 +271,8 @@ bptree_iterate(objset_t *os, uint64_t obj, boolean_t free, bptree_itor_t func,
*/
bte.be_birth_txg = UINT64_MAX;
dmu_write(os, obj, i * sizeof (bte),
sizeof (bte), &bte, tx);
sizeof (bte), &bte, tx,
DMU_READ_NO_PREFETCH);
}

if (!ioerr) {
Expand Down
2 changes: 1 addition & 1 deletion module/zfs/brt.c
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Expand Up @@ -809,7 +809,7 @@ brt_vdev_sync(spa_t *spa, brt_vdev_t *brtvd, dmu_tx_t *tx)
*/
dmu_write(spa->spa_meta_objset, brtvd->bv_mos_brtvdev, 0,
brtvd->bv_size * sizeof (brtvd->bv_entcount[0]),
brtvd->bv_entcount, tx);
brtvd->bv_entcount, tx, DMU_READ_NO_PREFETCH);
uint64_t nblocks = BRT_RANGESIZE_TO_NBLOCKS(brtvd->bv_size);
memset(brtvd->bv_bitmap, 0, BT_SIZEOFMAP(nblocks));
brtvd->bv_entcount_dirty = FALSE;
Expand Down
22 changes: 11 additions & 11 deletions module/zfs/dmu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -635,7 +635,7 @@ dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
int
dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
uint64_t length, int read, const void *tag, int *numbufsp,
dmu_buf_t ***dbpp)
dmu_buf_t ***dbpp, dmu_flags_t flags)
{
dnode_t *dn;
int err;
Expand All @@ -645,7 +645,7 @@ dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
return (err);

err = dmu_buf_hold_array_by_dnode(dn, offset, length, read, tag,
numbufsp, dbpp, DMU_READ_PREFETCH);
numbufsp, dbpp, flags);

dnode_rele(dn, FTAG);

Expand All @@ -655,14 +655,14 @@ dmu_buf_hold_array(objset_t *os, uint64_t object, uint64_t offset,
int
dmu_buf_hold_array_by_bonus(dmu_buf_t *db_fake, uint64_t offset,
uint64_t length, boolean_t read, const void *tag, int *numbufsp,
dmu_buf_t ***dbpp)
dmu_buf_t ***dbpp, dmu_flags_t flags)
{
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
int err;

DB_DNODE_ENTER(db);
err = dmu_buf_hold_array_by_dnode(DB_DNODE(db), offset, length, read,
tag, numbufsp, dbpp, DMU_READ_PREFETCH);
tag, numbufsp, dbpp, flags);
DB_DNODE_EXIT(db);

return (err);
Expand Down Expand Up @@ -1293,7 +1293,7 @@ dmu_write_impl(dmu_buf_t **dbp, int numbufs, uint64_t offset, uint64_t size,

void
dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
const void *buf, dmu_tx_t *tx)
const void *buf, dmu_tx_t *tx, dmu_flags_t flags)
{
dmu_buf_t **dbp;
int numbufs;
Expand All @@ -1302,8 +1302,8 @@ dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
return;

VERIFY0(dmu_buf_hold_array(os, object, offset, size,
FALSE, FTAG, &numbufs, &dbp));
dmu_write_impl(dbp, numbufs, offset, size, buf, tx, DMU_READ_PREFETCH);
FALSE, FTAG, &numbufs, &dbp, flags));
dmu_write_impl(dbp, numbufs, offset, size, buf, tx, flags);
dmu_buf_rele_array(dbp, numbufs, FTAG);
}

Expand Down Expand Up @@ -1346,7 +1346,7 @@ dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
return;

VERIFY0(dmu_buf_hold_array(os, object, offset, size,
FALSE, FTAG, &numbufs, &dbp));
FALSE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH));

for (i = 0; i < numbufs; i++) {
dmu_buf_t *db = dbp[i];
Expand Down Expand Up @@ -1383,7 +1383,7 @@ dmu_redact(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
dmu_buf_t **dbp;

VERIFY0(dmu_buf_hold_array(os, object, offset, size, FALSE, FTAG,
&numbufs, &dbp));
&numbufs, &dbp, DMU_READ_PREFETCH));
for (i = 0; i < numbufs; i++)
dmu_buf_redact(dbp[i], tx);
dmu_buf_rele_array(dbp, numbufs, FTAG);
Expand Down Expand Up @@ -2592,7 +2592,7 @@ dmu_read_l0_bps(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
int error, numbufs;

error = dmu_buf_hold_array(os, object, offset, length, FALSE, FTAG,
&numbufs, &dbp);
&numbufs, &dbp, DMU_READ_PREFETCH);
if (error != 0) {
if (error == ESRCH) {
error = SET_ERROR(ENXIO);
Expand Down Expand Up @@ -2693,7 +2693,7 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
spa = os->os_spa;

VERIFY0(dmu_buf_hold_array(os, object, offset, length, FALSE, FTAG,
&numbufs, &dbp));
&numbufs, &dbp, DMU_READ_PREFETCH));
ASSERT3U(nbps, ==, numbufs);

/*
Expand Down
6 changes: 4 additions & 2 deletions module/zfs/dmu_redact.c
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Expand Up @@ -544,15 +544,17 @@ redaction_list_update_sync(void *arg, dmu_tx_t *tx)
if (index == bufsize) {
dmu_write(mos, rl->rl_object,
rl->rl_phys->rlp_num_entries * sizeof (*buf),
bufsize * sizeof (*buf), buf, tx);
bufsize * sizeof (*buf), buf, tx,
DMU_READ_NO_PREFETCH);
rl->rl_phys->rlp_num_entries += bufsize;
index = 0;
}
kmem_free(rbln, sizeof (*rbln));
}
if (index > 0) {
dmu_write(mos, rl->rl_object, rl->rl_phys->rlp_num_entries *
sizeof (*buf), index * sizeof (*buf), buf, tx);
sizeof (*buf), index * sizeof (*buf), buf, tx,
DMU_READ_NO_PREFETCH);
rl->rl_phys->rlp_num_entries += index;
}
kmem_free(buf, bufsize * sizeof (*buf));
Expand Down
8 changes: 5 additions & 3 deletions module/zfs/metaslab.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3966,7 +3966,8 @@ metaslab_condense(metaslab_t *msp, dmu_tx_t *tx)
object = space_map_object(msp->ms_sm);
dmu_write(spa->spa_meta_objset,
msp->ms_group->mg_vd->vdev_ms_array, sizeof (uint64_t) *
msp->ms_id, sizeof (uint64_t), &object, tx);
msp->ms_id, sizeof (uint64_t), &object, tx,
DMU_READ_NO_PREFETCH);
}

/*
Expand Down Expand Up @@ -4292,7 +4293,8 @@ metaslab_sync(metaslab_t *msp, uint64_t txg)
VERIFY3U(new_object, !=, 0);

dmu_write(mos, vd->vdev_ms_array, sizeof (uint64_t) *
msp->ms_id, sizeof (uint64_t), &new_object, tx);
msp->ms_id, sizeof (uint64_t), &new_object, tx,
DMU_READ_NO_PREFETCH);

VERIFY0(space_map_open(&msp->ms_sm, mos, new_object,
msp->ms_start, msp->ms_size, vd->vdev_ashift));
Expand Down Expand Up @@ -6328,7 +6330,7 @@ metaslab_update_ondisk_flush_data(metaslab_t *ms, dmu_tx_t *tx)
}

dmu_write(spa_meta_objset(spa), object, entry_offset, entry_size,
&entry, tx);
&entry, tx, DMU_READ_NO_PREFETCH);
}

void
Expand Down
3 changes: 2 additions & 1 deletion module/zfs/spa.c
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Expand Up @@ -9601,7 +9601,8 @@ spa_sync_nvlist(spa_t *spa, uint64_t obj, nvlist_t *nv, dmu_tx_t *tx)
KM_SLEEP));
memset(packed + nvsize, 0, bufsize - nvsize);

dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx);
dmu_write(spa->spa_meta_objset, obj, 0, bufsize, packed, tx,
DMU_READ_NO_PREFETCH);

vmem_free(packed, bufsize);

Expand Down
2 changes: 1 addition & 1 deletion module/zfs/spa_checkpoint.c
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Expand Up @@ -427,7 +427,7 @@ spa_checkpoint_discard_thread(void *arg, zthr_t *zthr)
*/
int error = dmu_buf_hold_array_by_bonus(
checkpoint_sm->sm_dbuf, offset, size,
B_TRUE, FTAG, &numbufs, &dbp);
B_TRUE, FTAG, &numbufs, &dbp, DMU_READ_PREFETCH);
if (error != 0) {
zfs_panic_recover("zfs: error %d was returned "
"while prefetching checkpoint space map "
Expand Down
5 changes: 3 additions & 2 deletions module/zfs/spa_history.c
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Expand Up @@ -169,13 +169,14 @@ spa_history_write(spa_t *spa, void *buf, uint64_t len, spa_history_phys_t *shpp,
phys_eof = spa_history_log_to_phys(shpp->sh_eof, shpp);
firstwrite = MIN(len, shpp->sh_phys_max_off - phys_eof);
shpp->sh_eof += len;
dmu_write(mos, spa->spa_history, phys_eof, firstwrite, buf, tx);
dmu_write(mos, spa->spa_history, phys_eof, firstwrite, buf, tx,
DMU_READ_NO_PREFETCH);

len -= firstwrite;
if (len > 0) {
/* write out the rest at the beginning of physical file */
dmu_write(mos, spa->spa_history, shpp->sh_pool_create_len,
len, (char *)buf + firstwrite, tx);
len, (char *)buf + firstwrite, tx, DMU_READ_NO_PREFETCH);
}

return (0);
Expand Down
2 changes: 1 addition & 1 deletion module/zfs/space_map.c
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Expand Up @@ -537,7 +537,7 @@ space_map_write_intro_debug(space_map_t *sm, maptype_t maptype, dmu_tx_t *tx)
SM_DEBUG_TXG_ENCODE(dmu_tx_get_txg(tx));

dmu_write(sm->sm_os, space_map_object(sm), sm->sm_phys->smp_length,
sizeof (dentry), &dentry, tx);
sizeof (dentry), &dentry, tx, DMU_READ_NO_PREFETCH);

sm->sm_phys->smp_length += sizeof (dentry);
}
Expand Down
2 changes: 1 addition & 1 deletion module/zfs/vdev_indirect_births.c
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Expand Up @@ -147,7 +147,7 @@ vdev_indirect_births_add_entry(vdev_indirect_births_t *vib,

old_size = vdev_indirect_births_size_impl(vib);
dmu_write(vib->vib_objset, vib->vib_object, old_size, sizeof (vibe),
&vibe, tx);
&vibe, tx, DMU_READ_NO_PREFETCH);
vib->vib_phys->vib_count++;
new_size = vdev_indirect_births_size_impl(vib);

Expand Down
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