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Illumos #1862 incremental zfs receive fails for sparse file > 8PB

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1862 incremental zfs receive fails for sparse file > 8PB

Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com>
Reviewed by: Simon Klinkert <klinkert@webgods.de>
Approved by: Eric Schrock <eric.schrock@delphix.com>

References:
  illumos/illumos-gate@31495a1e56
  illumos changeset: 13789:f0c17d471b7a
  https://www.illumos.org/issues/1862

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Arne Jansen 2013-01-14 10:26:31 -08:00 committed by Brian Behlendorf
parent a94addd974
commit ff80d9b142
1 changed files with 27 additions and 15 deletions
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42
module/zfs/dmu_tx.c
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@ -446,6 +446,7 @@ dmu_tx_count_free(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
dsl_dataset_t *ds = dn->dn_objset->os_dsl_dataset;
spa_t *spa = txh->txh_tx->tx_pool->dp_spa;
int epbs;
uint64_t l0span = 0, nl1blks = 0;
if (dn->dn_nlevels == 0)
return;
@ -478,6 +479,7 @@ dmu_tx_count_free(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
nblks = dn->dn_maxblkid - blkid;
}
l0span = nblks; /* save for later use to calc level > 1 overhead */
if (dn->dn_nlevels == 1) {
int i;
for (i = 0; i < nblks; i++) {
@ -490,24 +492,10 @@ dmu_tx_count_free(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
}
unref += BP_GET_ASIZE(bp);
}
nl1blks = 1;
nblks = 0;
}
/*
* Add in memory requirements of higher-level indirects.
* This assumes a worst-possible scenario for dn_nlevels.
*/
{
uint64_t blkcnt = 1 + ((nblks >> epbs) >> epbs);
int level = (dn->dn_nlevels > 1) ? 2 : 1;
while (level++ < DN_MAX_LEVELS) {
txh->txh_memory_tohold += blkcnt << dn->dn_indblkshift;
blkcnt = 1 + (blkcnt >> epbs);
}
ASSERT(blkcnt <= dn->dn_nblkptr);
}
lastblk = blkid + nblks - 1;
while (nblks) {
dmu_buf_impl_t *dbuf;
@ -578,11 +566,35 @@ dmu_tx_count_free(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
}
dbuf_rele(dbuf, FTAG);
++nl1blks;
blkid += tochk;
nblks -= tochk;
}
rw_exit(&dn->dn_struct_rwlock);
/*
* Add in memory requirements of higher-level indirects.
* This assumes a worst-possible scenario for dn_nlevels and a
* worst-possible distribution of l1-blocks over the region to free.
*/
{
uint64_t blkcnt = 1 + ((l0span >> epbs) >> epbs);
int level = 2;
/*
* Here we don't use DN_MAX_LEVEL, but calculate it with the
* given datablkshift and indblkshift. This makes the
* difference between 19 and 8 on large files.
*/
int maxlevel = 2 + (DN_MAX_OFFSET_SHIFT - dn->dn_datablkshift) /
(dn->dn_indblkshift - SPA_BLKPTRSHIFT);
while (level++ < maxlevel) {
txh->txh_memory_tohold += MIN(blkcnt, (nl1blks >> epbs))
<< dn->dn_indblkshift;
blkcnt = 1 + (blkcnt >> epbs);
}
}
/* account for new level 1 indirect blocks that might show up */
if (skipped > 0) {
txh->txh_fudge += skipped << dn->dn_indblkshift;