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drbd: Preparing to use p_header96 for all packets

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recv_bm_rle_bits() should not make any assumptions abou the layout
of the packet header

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-01-19 16:13:06 +01:00
parent 191d3cc8d9
commit c6d25cfe52
1 changed files with 6 additions and 5 deletions
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11
drivers/block/drbd/drbd_receiver.c
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@ -3393,7 +3393,8 @@ receive_bitmap_plain(struct drbd_conf *mdev, unsigned int data_size,
static int static int
recv_bm_rle_bits(struct drbd_conf *mdev, recv_bm_rle_bits(struct drbd_conf *mdev,
struct p_compressed_bm *p, struct p_compressed_bm *p,
struct bm_xfer_ctx *c) struct bm_xfer_ctx *c,
unsigned int len)
{ {
struct bitstream bs; struct bitstream bs;
u64 look_ahead; u64 look_ahead;
@ -3401,7 +3402,6 @@ recv_bm_rle_bits(struct drbd_conf *mdev,
u64 tmp; u64 tmp;
unsigned long s = c->bit_offset; unsigned long s = c->bit_offset;
unsigned long e; unsigned long e;
int len = be16_to_cpu(p->head.length) - (sizeof(*p) - sizeof(p->head));
int toggle = DCBP_get_start(p); int toggle = DCBP_get_start(p);
int have; int have;
int bits; int bits;
@ -3458,10 +3458,11 @@ recv_bm_rle_bits(struct drbd_conf *mdev,
static int static int
decode_bitmap_c(struct drbd_conf *mdev, decode_bitmap_c(struct drbd_conf *mdev,
struct p_compressed_bm *p, struct p_compressed_bm *p,
struct bm_xfer_ctx *c) struct bm_xfer_ctx *c,
unsigned int len)
{ {
if (DCBP_get_code(p) == RLE_VLI_Bits) if (DCBP_get_code(p) == RLE_VLI_Bits)
return recv_bm_rle_bits(mdev, p, c); return recv_bm_rle_bits(mdev, p, c, len);
/* other variants had been implemented for evaluation, /* other variants had been implemented for evaluation,
* but have been dropped as this one turned out to be "best" * but have been dropped as this one turned out to be "best"
@ -3560,7 +3561,7 @@ 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); dev_err(DEV, "ReportCBitmap packet too small (l:%u)\n", data_size);
goto out; goto out;
} }
err = decode_bitmap_c(mdev, p, &c); err = decode_bitmap_c(mdev, p, &c, data_size);
} else { } else {
dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd); dev_warn(DEV, "receive_bitmap: cmd neither ReportBitMap nor ReportCBitMap (is 0x%x)", cmd);
goto out; goto out;