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[SCSI] iscsi: data digest page cache usage fix

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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>
This commit is contained in:
FUJITA Tomonori
2006-01-13 18:05:44 -06:00
committed by James Bottomley
parent 3e97c7e6cd
commit 56851698c2
2 changed files with 11 additions and 7 deletions
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2
drivers/scsi/iscsi_tcp.h
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@@ -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 {