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Revert "Report holes when there are only metadata changes" 

This reverts commit ec4f9b8f30 which introduced a narrow race which
can lead to lseek(, SEEK_DATA) incorrectly returning ENXIO.  Resolve
the issue by revering this change to restore the previous behavior
which depends solely on checking the dirty list.

Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8816 
Closes #8834
This commit is contained in:
Brian Behlendorf 2019-05-30 17:13:18 -07:00 committed by GitHub
parent 1608985a41
commit 2531ce3720
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 3 additions and 28 deletions
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27
module/zfs/dmu.c
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@ -2373,40 +2373,15 @@ dmu_offset_next(objset_t *os, uint64_t object, boolean_t hole, uint64_t *off)
return (err);
/*
* Check if there are dirty data blocks or frees which have not been
* synced. Dirty spill and bonus blocks which are external to the
* object can ignored when reporting holes.
* Check if dnode is dirty
*/
mutex_enter(&dn->dn_mtx);
for (i = 0; i < TXG_SIZE; i++) {
if (multilist_link_active(&dn->dn_dirty_link[i])) {
if (dn->dn_free_ranges[i] != NULL) {
clean = B_FALSE;
break;
}
list_t *list = &dn->dn_dirty_records[i];
dbuf_dirty_record_t *dr;
for (dr = list_head(list); dr != NULL;
dr = list_next(list, dr)) {
dmu_buf_impl_t *db = dr->dr_dbuf;
if (db->db_blkid == DMU_SPILL_BLKID ||
db->db_blkid == DMU_BONUS_BLKID)
continue;
clean = B_FALSE;
break;
}
}
if (clean == B_FALSE)
break;
}
mutex_exit(&dn->dn_mtx);
/*
* If compatibility option is on, sync any current changes before
* we go trundling through the block pointers.