From 2c46407d241f4b0e5b87959aae8f50f41fdd2a3a Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Sat, 11 Dec 2010 21:53:12 +0100 Subject: [PATCH] drbd: receive_bitmap_plain: Get rid of ugly and useless enum Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- drivers/block/drbd/drbd_receiver.c | 73 +++++++++++++++++++----------- 1 file changed, 47 insertions(+), 26 deletions(-) diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index f217d351d77c..be7fc67eeeca 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -3311,23 +3311,32 @@ static int receive_sync_uuid(struct drbd_conf *mdev, enum drbd_packets cmd, unsi return true; } -enum receive_bitmap_ret { OK, DONE, FAILED }; - -static enum receive_bitmap_ret +/** + * receive_bitmap_plain + * + * Return 0 when done, 1 when another iteration is needed, and a negative error + * code upon failure. + */ +static int receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, unsigned long *buffer, struct bm_xfer_ctx *c) { unsigned num_words = min_t(size_t, BM_PACKET_WORDS, c->bm_words - c->word_offset); unsigned want = num_words * sizeof(long); + int err; if (want != data_size) { dev_err(DEV, "%s:want (%u) != data_size (%u)\n", __func__, want, data_size); - return FAILED; + return -EIO; } if (want == 0) - return DONE; - if (drbd_recv(mdev, buffer, want) != want) - return FAILED; + return 0; + err = drbd_recv(mdev, buffer, want); + if (err != want) { + if (err >= 0) + err = -EIO; + return err; + } drbd_bm_merge_lel(mdev, c->word_offset, num_words, buffer); @@ -3336,10 +3345,16 @@ receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size, if (c->bit_offset > c->bm_bits) c->bit_offset = c->bm_bits; - return OK; + return 1; } -static enum receive_bitmap_ret +/** + * recv_bm_rle_bits + * + * Return 0 when done, 1 when another iteration is needed, and a negative error + * code upon failure. + */ +static int recv_bm_rle_bits(struct drbd_conf *mdev, struct p_compressed_bm *p, struct bm_xfer_ctx *c) @@ -3359,18 +3374,18 @@ recv_bm_rle_bits(struct drbd_conf *mdev, bits = bitstream_get_bits(&bs, &look_ahead, 64); if (bits < 0) - return FAILED; + return -EIO; for (have = bits; have > 0; s += rl, toggle = !toggle) { bits = vli_decode_bits(&rl, look_ahead); if (bits <= 0) - return FAILED; + return -EIO; if (toggle) { e = s + rl -1; if (e >= c->bm_bits) { dev_err(DEV, "bitmap overflow (e:%lu) while decoding bm RLE packet\n", e); - return FAILED; + return -EIO; } _drbd_bm_set_bits(mdev, s, e); } @@ -3380,14 +3395,14 @@ recv_bm_rle_bits(struct drbd_conf *mdev, have, bits, look_ahead, (unsigned int)(bs.cur.b - p->code), (unsigned int)bs.buf_len); - return FAILED; + return -EIO; } look_ahead >>= bits; have -= bits; bits = bitstream_get_bits(&bs, &tmp, 64 - have); if (bits < 0) - return FAILED; + return -EIO; look_ahead |= tmp << have; have += bits; } @@ -3395,10 +3410,16 @@ recv_bm_rle_bits(struct drbd_conf *mdev, c->bit_offset = s; bm_xfer_ctx_bit_to_word_offset(c); - return (s == c->bm_bits) ? DONE : OK; + return (s != c->bm_bits); } -static enum receive_bitmap_ret +/** + * decode_bitmap_c + * + * Return 0 when done, 1 when another iteration is needed, and a negative error + * code upon failure. + */ +static int decode_bitmap_c(struct drbd_conf *mdev, struct p_compressed_bm *p, struct bm_xfer_ctx *c) @@ -3412,7 +3433,7 @@ decode_bitmap_c(struct drbd_conf *mdev, dev_err(DEV, "receive_bitmap_c: unknown encoding %u\n", p->encoding); drbd_force_state(mdev, NS(conn, C_PROTOCOL_ERROR)); - return FAILED; + return -EIO; } void INFO_bm_xfer_stats(struct drbd_conf *mdev, @@ -3461,7 +3482,7 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigne { struct bm_xfer_ctx c; void *buffer; - enum receive_bitmap_ret ret; + int err; int ok = false; struct p_header80 *h = &mdev->data.rbuf.header.h80; @@ -3480,9 +3501,9 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigne .bm_words = drbd_bm_words(mdev), }; - do { + for(;;) { if (cmd == P_BITMAP) { - ret = receive_bitmap_plain(mdev, data_size, buffer, &c); + err = receive_bitmap_plain(mdev, data_size, buffer, &c); } else if (cmd == P_COMPRESSED_BITMAP) { /* MAYBE: sanity check that we speak proto >= 90, * and the feature is enabled! */ @@ -3501,7 +3522,7 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigne dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size); goto out; } - ret = decode_bitmap_c(mdev, p, &c); + err = decode_bitmap_c(mdev, p, &c); } else { dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); goto out; @@ -3510,14 +3531,14 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packets cmd, unsigne c.packets[cmd == P_BITMAP]++; c.bytes[cmd == P_BITMAP] += sizeof(struct p_header80) + data_size; - if (ret != OK) + if (err <= 0) { + if (err < 0) + goto out; break; - + } if (!drbd_recv_header(mdev, &cmd, &data_size)) goto out; - } while (ret == OK); - if (ret == FAILED) - goto out; + } INFO_bm_xfer_stats(mdev, "receive", &c); -- 2.30.2