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Remove code duplication

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Remove code duplication by moving code responsible for partial block
zeroing to a separate function: dnode_partial_zero().

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Closes #12627
This commit is contained in:
Pawel Jakub Dawidek 2021-10-18 16:50:33 -07:00 committed by GitHub
parent fd778e44c8
commit a95c82bed8
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 33 additions and 42 deletions
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75
module/zfs/dnode.c
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@ -2037,10 +2037,40 @@ dnode_set_dirtyctx(dnode_t *dn, dmu_tx_t *tx, void *tag)
}
}
static void
dnode_partial_zero(dnode_t *dn, uint64_t off, uint64_t blkoff, uint64_t len,
dmu_tx_t *tx)
{
dmu_buf_impl_t *db;
int res;
rw_enter(&dn->dn_struct_rwlock, RW_READER);
res = dbuf_hold_impl(dn, 0, dbuf_whichblock(dn, 0, off), TRUE, FALSE,
FTAG, &db);
rw_exit(&dn->dn_struct_rwlock);
if (res == 0) {
db_lock_type_t dblt;
boolean_t dirty;
dblt = dmu_buf_lock_parent(db, RW_READER, FTAG);
/* don't dirty if not on disk and not dirty */
dirty = !list_is_empty(&db->db_dirty_records) ||
(db->db_blkptr && !BP_IS_HOLE(db->db_blkptr));
dmu_buf_unlock_parent(db, dblt, FTAG);
if (dirty) {
caddr_t data;
dmu_buf_will_dirty(&db->db, tx);
data = db->db.db_data;
bzero(data + blkoff, len);
}
dbuf_rele(db, FTAG);
}
}
void
dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx)
{
dmu_buf_impl_t *db;
uint64_t blkoff, blkid, nblks;
int blksz, blkshift, head, tail;
int trunc = FALSE;
@ -2089,31 +2119,10 @@ dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx)
}
/* zero out any partial block data at the start of the range */
if (head) {
int res;
ASSERT3U(blkoff + head, ==, blksz);
if (len < head)
head = len;
rw_enter(&dn->dn_struct_rwlock, RW_READER);
res = dbuf_hold_impl(dn, 0, dbuf_whichblock(dn, 0, off),
TRUE, FALSE, FTAG, &db);
rw_exit(&dn->dn_struct_rwlock);
if (res == 0) {
caddr_t data;
boolean_t dirty;
db_lock_type_t dblt = dmu_buf_lock_parent(db, RW_READER,
FTAG);
/* don't dirty if it isn't on disk and isn't dirty */
dirty = !list_is_empty(&db->db_dirty_records) ||
(db->db_blkptr && !BP_IS_HOLE(db->db_blkptr));
dmu_buf_unlock_parent(db, dblt, FTAG);
if (dirty) {
dmu_buf_will_dirty(&db->db, tx);
data = db->db.db_data;
bzero(data + blkoff, head);
}
dbuf_rele(db, FTAG);
}
dnode_partial_zero(dn, off, blkoff, head, tx);
off += head;
len -= head;
}
@ -2135,27 +2144,9 @@ dnode_free_range(dnode_t *dn, uint64_t off, uint64_t len, dmu_tx_t *tx)
ASSERT0(P2PHASE(off, blksz));
/* zero out any partial block data at the end of the range */
if (tail) {
int res;
if (len < tail)
tail = len;
rw_enter(&dn->dn_struct_rwlock, RW_READER);
res = dbuf_hold_impl(dn, 0, dbuf_whichblock(dn, 0, off+len),
TRUE, FALSE, FTAG, &db);
rw_exit(&dn->dn_struct_rwlock);
if (res == 0) {
boolean_t dirty;
/* don't dirty if not on disk and not dirty */
db_lock_type_t type = dmu_buf_lock_parent(db, RW_READER,
FTAG);
dirty = !list_is_empty(&db->db_dirty_records) ||
(db->db_blkptr && !BP_IS_HOLE(db->db_blkptr));
dmu_buf_unlock_parent(db, type, FTAG);
if (dirty) {
dmu_buf_will_dirty(&db->db, tx);
bzero(db->db.db_data, tail);
}
dbuf_rele(db, FTAG);
}
dnode_partial_zero(dn, off + len, 0, tail, tx);
len -= tail;
}