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Revert Consolidate arc_buf allocation checks

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This reverts commit 13fac09868.

Per the discussion in #11531, the reverted commit---which intended only
to be a cleanup commit---introduced a subtle, unintended change in
behavior.

Care was taken to partially revert and then reapply 10b3c7f5e4
which would otherwise have caused a conflict.  These changes were
squashed in to this commit.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Suggested-by: @chrisrd
Suggested-by: robn@despairlabs.com
Signed-off-by: Antonio Russo <aerusso@aerusso.net>
Closes #11531
Closes #12227
This commit is contained in:
Antonio Russo 2021-06-22 22:39:15 -06:00 committed by Tony Hutter
parent 05c96b438a
commit 1ad8fcc054
1 changed files with 77 additions and 44 deletions
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121
module/zfs/dbuf.c
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@ -1090,42 +1090,6 @@ dbuf_set_data(dmu_buf_impl_t *db, arc_buf_t *buf)
db->db.db_data = buf->b_data; db->db.db_data = buf->b_data;
} }
static arc_buf_t *
dbuf_alloc_arcbuf_from_arcbuf(dmu_buf_impl_t *db, arc_buf_t *data)
{
objset_t *os = db->db_objset;
spa_t *spa = os->os_spa;
arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
enum zio_compress compress_type;
uint8_t complevel;
int psize, lsize;
psize = arc_buf_size(data);
lsize = arc_buf_lsize(data);
compress_type = arc_get_compression(data);
complevel = arc_get_complevel(data);
if (arc_is_encrypted(data)) {
boolean_t byteorder;
uint8_t salt[ZIO_DATA_SALT_LEN];
uint8_t iv[ZIO_DATA_IV_LEN];
uint8_t mac[ZIO_DATA_MAC_LEN];
dnode_t *dn = DB_DNODE(db);
arc_get_raw_params(data, &byteorder, salt, iv, mac);
data = arc_alloc_raw_buf(spa, db, dmu_objset_id(os),
byteorder, salt, iv, mac, dn->dn_type, psize, lsize,
compress_type, complevel);
} else if (compress_type != ZIO_COMPRESS_OFF) {
ASSERT3U(type, ==, ARC_BUFC_DATA);
data = arc_alloc_compressed_buf(spa, db,
psize, lsize, compress_type, complevel);
} else {
data = arc_alloc_buf(spa, db, type, psize);
}
return (data);
}
static arc_buf_t * static arc_buf_t *
dbuf_alloc_arcbuf(dmu_buf_impl_t *db) dbuf_alloc_arcbuf(dmu_buf_impl_t *db)
{ {
@ -1575,9 +1539,35 @@ dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg)
arc_space_consume(bonuslen, ARC_SPACE_BONUS); arc_space_consume(bonuslen, ARC_SPACE_BONUS);
bcopy(db->db.db_data, dr->dt.dl.dr_data, bonuslen); bcopy(db->db.db_data, dr->dt.dl.dr_data, bonuslen);
} else if (zfs_refcount_count(&db->db_holds) > db->db_dirtycnt) { } else if (zfs_refcount_count(&db->db_holds) > db->db_dirtycnt) {
arc_buf_t *buf = dbuf_alloc_arcbuf_from_arcbuf(db, db->db_buf); dnode_t *dn = DB_DNODE(db);
dr->dt.dl.dr_data = buf; int size = arc_buf_size(db->db_buf);
bcopy(db->db.db_data, buf->b_data, arc_buf_size(buf)); arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
spa_t *spa = db->db_objset->os_spa;
enum zio_compress compress_type =
arc_get_compression(db->db_buf);
uint8_t complevel = arc_get_complevel(db->db_buf);
if (arc_is_encrypted(db->db_buf)) {
boolean_t byteorder;
uint8_t salt[ZIO_DATA_SALT_LEN];
uint8_t iv[ZIO_DATA_IV_LEN];
uint8_t mac[ZIO_DATA_MAC_LEN];
arc_get_raw_params(db->db_buf, &byteorder, salt,
iv, mac);
dr->dt.dl.dr_data = arc_alloc_raw_buf(spa, db,
dmu_objset_id(dn->dn_objset), byteorder, salt, iv,
mac, dn->dn_type, size, arc_buf_lsize(db->db_buf),
compress_type, complevel);
} else if (compress_type != ZIO_COMPRESS_OFF) {
ASSERT3U(type, ==, ARC_BUFC_DATA);
dr->dt.dl.dr_data = arc_alloc_compressed_buf(spa, db,
size, arc_buf_lsize(db->db_buf), compress_type,
complevel);
} else {
dr->dt.dl.dr_data = arc_alloc_buf(spa, db, type, size);
}
bcopy(db->db.db_data, dr->dt.dl.dr_data->b_data, size);
} else { } else {
db->db_buf = NULL; db->db_buf = NULL;
dbuf_clear_data(db); dbuf_clear_data(db);
@ -3280,10 +3270,30 @@ noinline static void
dbuf_hold_copy(dnode_t *dn, dmu_buf_impl_t *db) dbuf_hold_copy(dnode_t *dn, dmu_buf_impl_t *db)
{ {
dbuf_dirty_record_t *dr = db->db_data_pending; dbuf_dirty_record_t *dr = db->db_data_pending;
arc_buf_t *newdata, *data = dr->dt.dl.dr_data; arc_buf_t *data = dr->dt.dl.dr_data;
enum zio_compress compress_type = arc_get_compression(data);
uint8_t complevel = arc_get_complevel(data);
if (arc_is_encrypted(data)) {
boolean_t byteorder;
uint8_t salt[ZIO_DATA_SALT_LEN];
uint8_t iv[ZIO_DATA_IV_LEN];
uint8_t mac[ZIO_DATA_MAC_LEN];
arc_get_raw_params(data, &byteorder, salt, iv, mac);
dbuf_set_data(db, arc_alloc_raw_buf(dn->dn_objset->os_spa, db,
dmu_objset_id(dn->dn_objset), byteorder, salt, iv, mac,
dn->dn_type, arc_buf_size(data), arc_buf_lsize(data),
compress_type, complevel));
} else if (compress_type != ZIO_COMPRESS_OFF) {
dbuf_set_data(db, arc_alloc_compressed_buf(
dn->dn_objset->os_spa, db, arc_buf_size(data),
arc_buf_lsize(data), compress_type, complevel));
} else {
dbuf_set_data(db, arc_alloc_buf(dn->dn_objset->os_spa, db,
DBUF_GET_BUFC_TYPE(db), db->db.db_size));
}
newdata = dbuf_alloc_arcbuf_from_arcbuf(db, data);
dbuf_set_data(db, newdata);
rw_enter(&db->db_rwlock, RW_WRITER); rw_enter(&db->db_rwlock, RW_WRITER);
bcopy(data->b_data, db->db.db_data, arc_buf_size(data)); bcopy(data->b_data, db->db.db_data, arc_buf_size(data));
rw_exit(&db->db_rwlock); rw_exit(&db->db_rwlock);
@ -4067,8 +4077,31 @@ dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx)
* objects only modified in the syncing context (e.g. * objects only modified in the syncing context (e.g.
* DNONE_DNODE blocks). * DNONE_DNODE blocks).
*/ */
*datap = dbuf_alloc_arcbuf_from_arcbuf(db, db->db_buf); int psize = arc_buf_size(*datap);
bcopy(db->db.db_data, (*datap)->b_data, arc_buf_size(*datap)); int lsize = arc_buf_lsize(*datap);
arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
enum zio_compress compress_type = arc_get_compression(*datap);
uint8_t complevel = arc_get_complevel(*datap);
if (arc_is_encrypted(*datap)) {
boolean_t byteorder;
uint8_t salt[ZIO_DATA_SALT_LEN];
uint8_t iv[ZIO_DATA_IV_LEN];
uint8_t mac[ZIO_DATA_MAC_LEN];
arc_get_raw_params(*datap, &byteorder, salt, iv, mac);
*datap = arc_alloc_raw_buf(os->os_spa, db,
dmu_objset_id(os), byteorder, salt, iv, mac,
dn->dn_type, psize, lsize, compress_type,
complevel);
} else if (compress_type != ZIO_COMPRESS_OFF) {
ASSERT3U(type, ==, ARC_BUFC_DATA);
*datap = arc_alloc_compressed_buf(os->os_spa, db,
psize, lsize, compress_type, complevel);
} else {
*datap = arc_alloc_buf(os->os_spa, db, type, psize);
}
bcopy(db->db.db_data, (*datap)->b_data, psize);
} }
db->db_data_pending = dr; db->db_data_pending = dr;