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Remove few pointer dereferences in dbuf_read()

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Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Closes #14199
This commit is contained in:
Alexander Motin
2022-11-29 12:49:02 -05:00
committed by GitHub
parent 9aea88ba44
commit fd61b2eaba
2 changed files with 4 additions and 13 deletions
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module/zfs/dbuf.c
+4 -5
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@@ -1503,8 +1503,8 @@ dbuf_read_verify_dnode_crypt(dmu_buf_impl_t *db, uint32_t flags)
ASSERT(MUTEX_HELD(&db->db_mtx));
if (!os->os_encrypted || os->os_raw_receive ||
(flags & DB_RF_NO_DECRYPT) != 0)
if ((flags & DB_RF_NO_DECRYPT) != 0 ||
!os->os_encrypted || os->os_raw_receive)
return (0);
DB_DNODE_ENTER(db);
@@ -1738,8 +1738,6 @@ dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
mutex_enter(&db->db_mtx);
if (db->db_state == DB_CACHED) {
spa_t *spa = dn->dn_objset->os_spa;
/*
* Ensure that this block's dnode has been decrypted if
* the caller has requested decrypted data.
@@ -1758,6 +1756,7 @@ dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
(arc_is_encrypted(db->db_buf) ||
arc_is_unauthenticated(db->db_buf) ||
arc_get_compression(db->db_buf) != ZIO_COMPRESS_OFF)) {
spa_t *spa = dn->dn_objset->os_spa;
zbookmark_phys_t zb;
SET_BOOKMARK(&zb, dmu_objset_id(db->db_objset),
@@ -1774,13 +1773,13 @@ dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
DB_DNODE_EXIT(db);
DBUF_STAT_BUMP(hash_hits);
} else if (db->db_state == DB_UNCACHED) {
spa_t *spa = dn->dn_objset->os_spa;
boolean_t need_wait = B_FALSE;
db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER, FTAG);
if (zio == NULL &&
db->db_blkptr != NULL && !BP_IS_HOLE(db->db_blkptr)) {
spa_t *spa = dn->dn_objset->os_spa;
zio = zio_root(spa, NULL, NULL, ZIO_FLAG_CANFAIL);
need_wait = B_TRUE;
}