Handle compressed buffers in __dbuf_hold_impl()

In __dbuf_hold_impl(), if a buffer is currently syncing and is still
referenced from db_data, a copy is made in case it is dirtied again in
the txg.  Previously, the buffer for the copy was simply allocated with
arc_alloc_buf() which doesn't handle compressed or encrypted buffers
(which are a special case of a compressed buffer).  The result was
typically an invalid memory access because the newly-allocated buffer
was of the uncompressed size.

This commit fixes the problem by handling the 2 compressed cases,
encrypted and unencrypted, respectively, with arc_alloc_raw_buf() and
arc_alloc_compressed_buf().

Although using the proper allocation functions fixes the invalid memory
access by allocating a buffer of the compressed size, another unrelated
issue made it impossible to properly detect compressed buffers in the
first place.  The header's compression flag was set to ZIO_COMPRESS_OFF
in arc_write() when it was possible that an attached buffer was actually
compressed.  This commit adds logic to only set ZIO_COMPRESS_OFF in
the non-ZIO_RAW case which wil handle both cases of compressed buffers
(encrypted or unencrypted).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Closes #5742 
Closes #6797

module/zfs/arc.c

@@ -6931,7 +6931,8 @@ arc_write(zio_t *pio, spa_t *spa, uint64_t txg,
 	if (HDR_HAS_RABD(hdr))
 		arc_hdr_free_abd(hdr, B_TRUE);
 
-	arc_hdr_set_compress(hdr, ZIO_COMPRESS_OFF);
+	if (!(zio_flags & ZIO_FLAG_RAW))
+		arc_hdr_set_compress(hdr, ZIO_COMPRESS_OFF);
 
 	ASSERT(!arc_buf_is_shared(buf));
 	ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);