Remove dmu_write_pages() support

For the moment we do not use dmu_write_pages() to write pages
directly in to a dmu object.  It may be required at some point
in the future, but for now is simplest and cleanest to drop it.
It can be easily readded if/when needed.

include/sys/dmu.h

@@ -522,10 +522,6 @@ int dmu_write_uio(objset_t *os, uint64_t object, struct uio *uio, uint64_t size,
 	dmu_tx_t *tx);
 int dmu_write_uio_dbuf(dmu_buf_t *zdb, struct uio *uio, uint64_t size,
 	dmu_tx_t *tx);
-#ifdef HAVE_ZPL
-int dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset,
-    uint64_t size, struct page *pp, dmu_tx_t *tx);
-#endif
 #endif
 struct arc_buf *dmu_request_arcbuf(dmu_buf_t *handle, int size);
 void dmu_return_arcbuf(struct arc_buf *buf);

module/zfs/dmu.c

@@ -1268,63 +1268,6 @@ dmu_write_uio(objset_t *os, uint64_t object, uio_t *uio, uint64_t size,
 
 	return (err);
 }
-
-#ifdef HAVE_ZPL
-int
-dmu_write_pages(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
-    page_t *pp, dmu_tx_t *tx)
-{
-	dmu_buf_t **dbp;
-	int numbufs, i;
-	int err;
-
-	if (size == 0)
-		return (0);
-
-	err = dmu_buf_hold_array(os, object, offset, size,
-	    FALSE, FTAG, &numbufs, &dbp);
-	if (err)
-		return (err);
-
-	for (i = 0; i < numbufs; i++) {
-		int tocpy, copied, thiscpy;
-		int bufoff;
-		dmu_buf_t *db = dbp[i];
-		caddr_t va;
-
-		ASSERT(size > 0);
-		ASSERT3U(db->db_size, >=, PAGESIZE);
-
-		bufoff = offset - db->db_offset;
-		tocpy = (int)MIN(db->db_size - bufoff, size);
-
-		ASSERT(i == 0 || i == numbufs-1 || tocpy == db->db_size);
-
-		if (tocpy == db->db_size)
-			dmu_buf_will_fill(db, tx);
-		else
-			dmu_buf_will_dirty(db, tx);
-
-		for (copied = 0; copied < tocpy; copied += PAGESIZE) {
-			ASSERT3U(pp->p_offset, ==, db->db_offset + bufoff);
-			thiscpy = MIN(PAGESIZE, tocpy - copied);
-			va = zfs_map_page(pp, S_READ);
-			bcopy(va, (char *)db->db_data + bufoff, thiscpy);
-			zfs_unmap_page(pp, va);
-			pp = pp->p_next;
-			bufoff += PAGESIZE;
-		}
-
-		if (tocpy == db->db_size)
-			dmu_buf_fill_done(db, tx);
-
-		offset += tocpy;
-		size -= tocpy;
-	}
-	dmu_buf_rele_array(dbp, numbufs, FTAG);
-	return (err);
-}
-#endif /* HAVE_ZPL */
 #endif /* _KERNEL */
 
 /*