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Additional block cloning fixes.

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Reimplement some of the block cloning vs dbuf logic, mostly to fix
situation where we clone a block and in the same transaction group
we want to partially overwrite the clone.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #14825
This commit is contained in:
Pawel Jakub Dawidek
2023-04-30 02:47:09 -07:00
committed by Brian Behlendorf
parent 469019fb0b
commit 555ef90c5c
3 changed files with 95 additions and 45 deletions
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module/zfs/dmu.c
+1 -13
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@@ -2284,18 +2284,7 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
ASSERT(db->db_blkid != DMU_BONUS_BLKID);
ASSERT(BP_IS_HOLE(bp) || dbuf->db_size == BP_GET_LSIZE(bp));
mutex_enter(&db->db_mtx);
VERIFY(!dbuf_undirty(db, tx));
ASSERT(list_head(&db->db_dirty_records) == NULL);
if (db->db_buf != NULL) {
arc_buf_destroy(db->db_buf, db);
db->db_buf = NULL;
}
mutex_exit(&db->db_mtx);
dmu_buf_will_not_fill(dbuf, tx);
dmu_buf_will_clone(dbuf, tx);
mutex_enter(&db->db_mtx);
@@ -2305,7 +2294,6 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
dl = &dr->dt.dl;
dl->dr_overridden_by = *bp;
dl->dr_brtwrite = B_TRUE;
dl->dr_override_state = DR_OVERRIDDEN;
if (BP_IS_HOLE(bp)) {
dl->dr_overridden_by.blk_birth = 0;