diff options
| -rw-r--r-- | module/zfs/dmu_tx.c | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/module/zfs/dmu_tx.c b/module/zfs/dmu_tx.c index 47ec4c109..044349c34 100644 --- a/module/zfs/dmu_tx.c +++ b/module/zfs/dmu_tx.c @@ -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; |