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Change os->os_next_write_raw to work per txg 

Currently, os_next_write_raw is a single boolean used for determining
whether or not the next call to dmu_objset_sync() should write out
the objset_phys_t as a raw buffer. Since the boolean is not associated
with a txg, the work simply happens during the next txg, which is not
necessarily the correct one. In the current implementation this issue
was misdiagnosed, resulting in a small hack in dmu_objset_sync() which
seemed to resolve the problem.

This patch changes os_next_write_raw to be an array of booleans, one
for each txg in TXG_OFF and removes the hack.

Reviewed-by: Jorgen Lundman <lundman@lundman.net>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #6864
This commit is contained in:
Tom Caputi 2018-02-01 15:37:24 -05:00 committed by Brian Behlendorf
parent 047116ac76
commit 1b66810bad
6 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/sys/dmu_objset.h
View File

@ -127,7 +127,7 @@ struct objset {
boolean_t os_rescan_dnodes;
/* os_phys_buf should be written raw next txg */
boolean_t os_next_write_raw;
boolean_t os_next_write_raw[TXG_SIZE];
/* Protected by os_obj_lock */
kmutex_t os_obj_lock;

1
module/zfs/dbuf.c
View File

@ -2218,6 +2218,7 @@ dmu_buf_will_change_crypt_params(dmu_buf_t *db_fake, dmu_tx_t *tx)
ASSERT3P(dr, !=, NULL);
ASSERT3U(dr->dr_txg, ==, tx->tx_txg);
dr->dt.dl.dr_raw = B_TRUE;
db->db_objset->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
}
#pragma weak dmu_buf_fill_done = dbuf_fill_done

4
module/zfs/dmu_objset.c
View File

@ -1508,9 +1508,9 @@ dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx)
* the os_phys_buf raw. Neither of these actions will effect the MAC
* at this point.
*/
if (arc_is_unauthenticated(os->os_phys_buf) || os->os_next_write_raw) {
if (os->os_next_write_raw[tx->tx_txg & TXG_MASK]) {
ASSERT(os->os_encrypted);
os->os_next_write_raw = B_FALSE;
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE;
arc_convert_to_raw(os->os_phys_buf,
os->os_dsl_dataset->ds_object, ZFS_HOST_BYTEORDER,
DMU_OT_OBJSET, NULL, NULL, NULL);

2
module/zfs/dsl_crypt.c
View File

@ -2177,7 +2177,7 @@ dsl_crypto_recv_key_sync(void *arg, dmu_tx_t *tx)
arc_release(os->os_phys_buf, &os->os_phys_buf);
bcopy(portable_mac, os->os_phys->os_portable_mac, ZIO_OBJSET_MAC_LEN);
bzero(os->os_phys->os_local_mac, ZIO_OBJSET_MAC_LEN);
os->os_next_write_raw = B_TRUE;
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
/* set metadnode compression and checksum */
mdn->dn_compress = compress;

2
module/zfs/dsl_dataset.c
View File

@ -941,7 +941,7 @@ dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx)
bzero(&os->os_zil_header, sizeof (os->os_zil_header));
if (os->os_encrypted)
os->os_next_write_raw = B_TRUE;
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
dsl_dataset_sync(ds, zio, tx);

4
module/zfs/zil.c
View File

@ -796,7 +796,7 @@ zil_claim(dsl_pool_t *dp, dsl_dataset_t *ds, void *txarg)
zio_free_zil(zilog->zl_spa, first_txg, &zh->zh_log);
BP_ZERO(&zh->zh_log);
if (os->os_encrypted)
os->os_next_write_raw = B_TRUE;
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
dsl_dataset_dirty(dmu_objset_ds(os), tx);
dmu_objset_disown(os, B_FALSE, FTAG);
return (0);
@ -820,7 +820,7 @@ zil_claim(dsl_pool_t *dp, dsl_dataset_t *ds, void *txarg)
zh->zh_flags |= ZIL_REPLAY_NEEDED;
zh->zh_flags |= ZIL_CLAIM_LR_SEQ_VALID;
if (os->os_encrypted)
os->os_next_write_raw = B_TRUE;
os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE;
dsl_dataset_dirty(dmu_objset_ds(os), tx);
}