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Change os->os_next_write_raw to work per txg

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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
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module/zfs/dmu_objset.c
+2 -2
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@@ -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);