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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2007-02-13 15:21:52 +0100
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2007-02-16 16:40:56 +0100
commit930e99bd1320d78c7d8866595e81b8fc7dc8739b (patch)
treee079f35c0aa2b58cf41675c66b7cfa96e6b068f6 /drivers/scsi/scsi_tgt_if.c
parent[SCSI] sgiwd93: interfacing to wd33c93 (diff)
downloadlinux-930e99bd1320d78c7d8866595e81b8fc7dc8739b.tar.xz
linux-930e99bd1320d78c7d8866595e81b8fc7dc8739b.zip
[SCSI] tgt: fix the user/kernel ring buffer interface
This patches fixes two bugs in the scsi target infrastructure's user/kernel interface. - It wrongly assumes that the ring buffer size of the interface (64KB) is larger than or equal to the system page size. This patch sets the ring buffer size to PAGE_SIZE if the system page size is larger. - It uses PAGE_SIZE in the header file exported to userspace. This patch removes it. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/scsi_tgt_if.c')
-rw-r--r--drivers/scsi/scsi_tgt_if.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_tgt_if.c b/drivers/scsi/scsi_tgt_if.c
index f2344ab8deff..0e08817fdecf 100644
--- a/drivers/scsi/scsi_tgt_if.c
+++ b/drivers/scsi/scsi_tgt_if.c
@@ -33,6 +33,14 @@
#include "scsi_tgt_priv.h"
+#if TGT_RING_SIZE < PAGE_SIZE
+# define TGT_RING_SIZE PAGE_SIZE
+#endif
+
+#define TGT_RING_PAGES (TGT_RING_SIZE >> PAGE_SHIFT)
+#define TGT_EVENT_PER_PAGE (PAGE_SIZE / sizeof(struct tgt_event))
+#define TGT_MAX_EVENTS (TGT_EVENT_PER_PAGE * TGT_RING_PAGES)
+
struct tgt_ring {
u32 tr_idx;
unsigned long tr_pages[TGT_RING_PAGES];