svn commit: r272591 - vendor-sys/illumos/dist/uts/common/fs/zfs
Xin LI
delphij at FreeBSD.org
Mon Oct 6 06:04:11 UTC 2014
Author: delphij
Date: Mon Oct 6 06:04:10 2014
New Revision: 272591
URL: https://svnweb.freebsd.org/changeset/base/272591
Log:
5162 zfs recv should use loaned arc buffer to avoid copy
Reviewed by: Christopher Siden <christopher.siden at delphix.com>
Reviewed by: George Wilson <george.wilson at delphix.com>
Reviewed by: Bayard Bell <Bayard.Bell at nexenta.com>
Reviewed by: Richard Elling <richard.elling at gmail.com>
Approved by: Garrett D'Amore <garrett at damore.org>
Author: Matthew Ahrens <mahrens at delphix.com>
illumos/illumos-gate at 8a9047098ad8ce5afa38b6d012c8b509bb619f40
Modified:
vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c
vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c Mon Oct 6 06:03:25 2014 (r272590)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/dmu.c Mon Oct 6 06:04:10 2014 (r272591)
@@ -1264,7 +1264,14 @@ dmu_assign_arcbuf(dmu_buf_t *handle, uin
rw_exit(&dn->dn_struct_rwlock);
DB_DNODE_EXIT(dbuf);
- if (offset == db->db.db_offset && blksz == db->db.db_size) {
+ /*
+ * We can only assign if the offset is aligned, the arc buf is the
+ * same size as the dbuf, and the dbuf is not metadata. It
+ * can't be metadata because the loaned arc buf comes from the
+ * user-data kmem arena.
+ */
+ if (offset == db->db.db_offset && blksz == db->db.db_size &&
+ DBUF_GET_BUFC_TYPE(db) == ARC_BUFC_DATA) {
dbuf_assign_arcbuf(db, buf, tx);
dbuf_rele(db, FTAG);
} else {
Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c Mon Oct 6 06:03:25 2014 (r272590)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/dmu_send.c Mon Oct 6 06:04:10 2014 (r272591)
@@ -1212,11 +1212,13 @@ free_guid_map_onexit(void *arg)
}
static void *
-restore_read(struct restorearg *ra, int len)
+restore_read(struct restorearg *ra, int len, char *buf)
{
- void *rv;
int done = 0;
+ if (buf == NULL)
+ buf = ra->buf;
+
/* some things will require 8-byte alignment, so everything must */
ASSERT0(len % 8);
@@ -1224,7 +1226,7 @@ restore_read(struct restorearg *ra, int
ssize_t resid;
ra->err = vn_rdwr(UIO_READ, ra->vp,
- (caddr_t)ra->buf + done, len - done,
+ buf + done, len - done,
ra->voff, UIO_SYSSPACE, FAPPEND,
RLIM64_INFINITY, CRED(), &resid);
@@ -1237,12 +1239,11 @@ restore_read(struct restorearg *ra, int
}
ASSERT3U(done, ==, len);
- rv = ra->buf;
if (ra->byteswap)
- fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
+ fletcher_4_incremental_byteswap(buf, len, &ra->cksum);
else
- fletcher_4_incremental_native(rv, len, &ra->cksum);
- return (rv);
+ fletcher_4_incremental_native(buf, len, &ra->cksum);
+ return (buf);
}
static void
@@ -1357,7 +1358,7 @@ restore_object(struct restorearg *ra, ob
return (SET_ERROR(EINVAL));
if (drro->drr_bonuslen) {
- data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
+ data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8), NULL);
if (ra->err != 0)
return (ra->err);
}
@@ -1454,19 +1455,30 @@ restore_write(struct restorearg *ra, obj
!DMU_OT_IS_VALID(drrw->drr_type))
return (SET_ERROR(EINVAL));
- data = restore_read(ra, drrw->drr_length);
- if (data == NULL)
- return (ra->err);
-
if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
return (SET_ERROR(EINVAL));
+ dmu_buf_t *bonus;
+ if (dmu_bonus_hold(os, drrw->drr_object, FTAG, &bonus) != 0)
+ return (SET_ERROR(EINVAL));
+
+ arc_buf_t *abuf = dmu_request_arcbuf(bonus, drrw->drr_length);
+
+ data = restore_read(ra, drrw->drr_length, abuf->b_data);
+ if (data == NULL) {
+ dmu_return_arcbuf(abuf);
+ dmu_buf_rele(bonus, FTAG);
+ return (ra->err);
+ }
+
tx = dmu_tx_create(os);
dmu_tx_hold_write(tx, drrw->drr_object,
drrw->drr_offset, drrw->drr_length);
err = dmu_tx_assign(tx, TXG_WAIT);
if (err != 0) {
+ dmu_return_arcbuf(abuf);
+ dmu_buf_rele(bonus, FTAG);
dmu_tx_abort(tx);
return (err);
}
@@ -1475,9 +1487,9 @@ restore_write(struct restorearg *ra, obj
DMU_OT_BYTESWAP(drrw->drr_type);
dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
}
- dmu_write(os, drrw->drr_object,
- drrw->drr_offset, drrw->drr_length, data, tx);
+ dmu_assign_arcbuf(bonus, drrw->drr_offset, abuf, tx);
dmu_tx_commit(tx);
+ dmu_buf_rele(bonus, FTAG);
return (0);
}
@@ -1559,7 +1571,7 @@ restore_write_embedded(struct restorearg
if (drrwnp->drr_compression >= ZIO_COMPRESS_FUNCTIONS)
return (EINVAL);
- data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8));
+ data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8), NULL);
if (data == NULL)
return (ra->err);
@@ -1594,7 +1606,7 @@ restore_spill(struct restorearg *ra, obj
drrs->drr_length > SPA_MAXBLOCKSIZE)
return (SET_ERROR(EINVAL));
- data = restore_read(ra, drrs->drr_length);
+ data = restore_read(ra, drrs->drr_length, NULL);
if (data == NULL)
return (ra->err);
@@ -1735,7 +1747,7 @@ dmu_recv_stream(dmu_recv_cookie_t *drc,
*/
pcksum = ra.cksum;
while (ra.err == 0 &&
- NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
+ NULL != (drr = restore_read(&ra, sizeof (*drr), NULL))) {
if (issig(JUSTLOOKING) && issig(FORREAL)) {
ra.err = SET_ERROR(EINTR);
goto out;
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