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authorFUJITA Tomonori <tomof@acm.org>2006-01-13 18:05:44 -0600
committerJames Bottomley <jejb@mulgrave.(none)>2006-01-14 10:55:17 -0600
commit56851698c23430f0f291d6e50da344e6b414f3b9 (patch)
treee051fccf90003b6057c961b1b954725f38413d02 /drivers/scsi/iscsi_tcp.h
parent3e97c7e6cda933e3a1b518a8100d155c532a3cfc (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>
Diffstat (limited to 'drivers/scsi/iscsi_tcp.h')
-rw-r--r--drivers/scsi/iscsi_tcp.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index 9badafe8820d..c8bb5b0bcb4b 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 {