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[v2,1/2] libceph: save and covert sr_datalen to host-endian

Message ID 20231101005033.21995-2-xiubli@redhat.com
State New
Headers show
Series libceph: sparse-read misc fixes | expand

Commit Message

Xiubo Li Nov. 1, 2023, 12:50 a.m. UTC 
From: Xiubo Li <xiubli@redhat.com>

We need to save the real data length to determine exactly how many
data we can parse later.

URL: https://tracker.ceph.com/issues/62081
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
---
 include/linux/ceph/osd_client.h | 3 ++-
 net/ceph/osd_client.c           | 7 ++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)
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Patch

diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index bf9823956758..f703fb8030de 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -45,6 +45,7 @@  enum ceph_sparse_read_state {
 	CEPH_SPARSE_READ_HDR	= 0,
 	CEPH_SPARSE_READ_EXTENTS,
 	CEPH_SPARSE_READ_DATA_LEN,
+	CEPH_SPARSE_READ_DATA_PRE,
 	CEPH_SPARSE_READ_DATA,
 };
 
@@ -64,7 +65,7 @@  struct ceph_sparse_read {
 	u64				sr_req_len;  /* orig request length */
 	u64				sr_pos;      /* current pos in buffer */
 	int				sr_index;    /* current extent index */
-	__le32				sr_datalen;  /* length of actual data */
+	u32				sr_datalen;  /* length of actual data */
 	u32				sr_count;    /* extent count in reply */
 	int				sr_ext_len;  /* length of extent array */
 	struct ceph_sparse_extent	*sr_extent;  /* extent array */
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index d3a759e052c8..800a2acec069 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -5912,8 +5912,13 @@  static int osd_sparse_read(struct ceph_connection *con,
 		convert_extent_map(sr);
 		ret = sizeof(sr->sr_datalen);
 		*pbuf = (char *)&sr->sr_datalen;
-		sr->sr_state = CEPH_SPARSE_READ_DATA;
+		sr->sr_state = CEPH_SPARSE_READ_DATA_PRE;
 		break;
+	case CEPH_SPARSE_READ_DATA_PRE:
+		/* Convert sr_datalen to host-endian */
+		sr->sr_datalen = le32_to_cpu((__force __le32)sr->sr_datalen);
+		sr->sr_state = CEPH_SPARSE_READ_DATA;
+		fallthrough;
 	case CEPH_SPARSE_READ_DATA:
 		if (sr->sr_index >= count) {
 			sr->sr_state = CEPH_SPARSE_READ_HDR;