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Honor logbias when writing to ZVOLs.

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The logbias option is not taken into account when writing to ZVOLs. We fix
that by using the same logic as in the zfs filesystem write code
(see zfs_log.c).

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #774
This commit is contained in:
Etienne Dechamps 2012-06-06 11:30:24 +02:00 committed by Brian Behlendorf
parent cac1f230e0
commit ab85f8455b
1 changed files with 6 additions and 2 deletions
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8
module/zfs/zvol.c
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@ -459,11 +459,15 @@ zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx,
uint32_t blocksize = zv->zv_volblocksize; uint32_t blocksize = zv->zv_volblocksize;
zilog_t *zilog = zv->zv_zilog; zilog_t *zilog = zv->zv_zilog;
boolean_t slogging; boolean_t slogging;
ssize_t immediate_write_sz;
if (zil_replaying(zilog, tx)) if (zil_replaying(zilog, tx))
return; return;
slogging = spa_has_slogs(zilog->zl_spa); immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT)
? 0 : zvol_immediate_write_sz;
slogging = spa_has_slogs(zilog->zl_spa) &&
(zilog->zl_logbias == ZFS_LOGBIAS_LATENCY);
while (size) { while (size) {
itx_t *itx; itx_t *itx;
@ -475,7 +479,7 @@ zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx,
* Unlike zfs_log_write() we can be called with * Unlike zfs_log_write() we can be called with
* up to DMU_MAX_ACCESS/2 (5MB) writes. * up to DMU_MAX_ACCESS/2 (5MB) writes.
*/ */
if (blocksize > zvol_immediate_write_sz && !slogging && if (blocksize > immediate_write_sz && !slogging &&
size >= blocksize && offset % blocksize == 0) { size >= blocksize && offset % blocksize == 0) {
write_state = WR_INDIRECT; /* uses dmu_sync */ write_state = WR_INDIRECT; /* uses dmu_sync */
len = blocksize; len = blocksize;