diff options
author | FUJITA Tomonori <tomof@acm.org> | 2006-01-13 18:05:44 -0600 |
---|---|---|
committer | James Bottomley <jejb@mulgrave.(none)> | 2006-01-14 10:55:17 -0600 |
commit | 56851698c23430f0f291d6e50da344e6b414f3b9 (patch) | |
tree | e051fccf90003b6057c961b1b954725f38413d02 | |
parent | 3e97c7e6cda933e3a1b518a8100d155c532a3cfc (diff) |
[SCSI] iscsi: data digest page cache usage fix
Users can write to a page while we are sending it and making
digest calculations. This ends up causing us to retry the command
when a digest error is later reported. By using sock_no_sendpage
when data digests are calculated we can avoid a lot of (not all but it
helps) the retries becuase sock_no_sendpage is not zero copy.
Signed-off-by: Alex Aizman <itn780@yahoo.com>
Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r-- | drivers/scsi/iscsi_tcp.c | 16 | ||||
-rw-r--r-- | drivers/scsi/iscsi_tcp.h | 2 |
2 files changed, 11 insertions, 7 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index cd1491e5236..5e8b3135574 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -1318,15 +1318,15 @@ iscsi_conn_restore_callbacks(struct iscsi_conn *conn) * to use tcp_sendmsg(). */ static inline int -iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags) +iscsi_send(struct iscsi_conn *conn, struct iscsi_buf *buf, int size, int flags) { + struct socket *sk = conn->sock; int res; if ((int)buf->sg.offset >= 0) { int offset = buf->sg.offset + buf->sent; - /* tcp_sendpage */ - res = sk->ops->sendpage(sk, buf->sg.page, offset, size, flags); + res = conn->sendpage(sk, buf->sg.page, offset, size, flags); } else { struct msghdr msg; @@ -1354,7 +1354,6 @@ iscsi_send(struct socket *sk, struct iscsi_buf *buf, int size, int flags) static inline int iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) { - struct socket *sk = conn->sock; int flags = 0; /* MSG_DONTWAIT; */ int res, size; @@ -1363,7 +1362,7 @@ iscsi_sendhdr(struct iscsi_conn *conn, struct iscsi_buf *buf, int datalen) if (buf->sent + size != buf->sg.length || datalen) flags |= MSG_MORE; - res = iscsi_send(sk, buf, size, flags); + res = iscsi_send(conn, buf, size, flags); debug_tcp("sendhdr %d bytes, sent %d res %d\n", size, buf->sent, res); if (res >= 0) { conn->txdata_octets += res; @@ -1394,7 +1393,6 @@ static inline int iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, int *count, int *sent) { - struct socket *sk = conn->sock; int flags = 0; /* MSG_DONTWAIT; */ int res, size; @@ -1405,7 +1403,7 @@ iscsi_sendpage(struct iscsi_conn *conn, struct iscsi_buf *buf, if (buf->sent + size != buf->sg.length || *count != size) flags |= MSG_MORE; - res = iscsi_send(sk, buf, size, flags); + res = iscsi_send(conn, buf, size, flags); debug_tcp("sendpage: %d bytes, sent %d left %d sent %d res %d\n", size, buf->sent, *count, *sent, res); if (res >= 0) { @@ -2713,6 +2711,8 @@ iscsi_conn_bind(iscsi_sessionh_t sessionh, iscsi_connh_t connh, */ iscsi_conn_set_callbacks(conn); + conn->sendpage = conn->sock->ops->sendpage; + /* * set receive state machine into initial state */ @@ -3467,6 +3467,8 @@ iscsi_conn_set_param(iscsi_connh_t connh, enum iscsi_param param, if (conn->data_rx_tfm) crypto_free_tfm(conn->data_rx_tfm); } + conn->sendpage = conn->datadgst_en ? + sock_no_sendpage : conn->sock->ops->sendpage; break; case ISCSI_PARAM_INITIAL_R2T_EN: session->initial_r2t_en = value; diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index 9badafe8820..c8bb5b0bcb4 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -191,6 +191,8 @@ struct iscsi_conn { uint32_t sendpage_failures_cnt; uint32_t discontiguous_hdr_cnt; uint32_t eh_abort_cnt; + + ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int); }; struct iscsi_session { |