diff options
Diffstat (limited to 'usr/src/uts/common/fs/zfs/dmu_zfetch.c')
| -rw-r--r-- | usr/src/uts/common/fs/zfs/dmu_zfetch.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/usr/src/uts/common/fs/zfs/dmu_zfetch.c b/usr/src/uts/common/fs/zfs/dmu_zfetch.c index de2360f580..5d5c478627 100644 --- a/usr/src/uts/common/fs/zfs/dmu_zfetch.c +++ b/usr/src/uts/common/fs/zfs/dmu_zfetch.c @@ -211,11 +211,22 @@ dmu_zfetch(zfetch_t *zf, uint64_t blkid, uint64_t nblks, boolean_t fetch_data) int64_t pf_ahead_blks, max_blks; int epbs, max_dist_blks, pf_nblks, ipf_nblks; uint64_t end_of_access_blkid = blkid + nblks; + spa_t *spa = zf->zf_dnode->dn_objset->os_spa; if (zfs_prefetch_disable) return; /* + * If we haven't yet loaded the indirect vdevs' mappings, we + * can only read from blocks that we carefully ensure are on + * concrete vdevs (or previously-loaded indirect vdevs). So we + * can't allow the predictive prefetcher to attempt reads of other + * blocks (e.g. of the MOS's dnode obejct). + */ + if (!spa_indirect_vdevs_loaded(spa)) + return; + + /* * As a fast path for small (single-block) files, ignore access * to the first block. */ |