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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2007-02-13 17:21:52 +0300 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.il.steeleye.com> | 2007-02-16 18:40:56 +0300 |
| commit | 930e99bd1320d78c7d8866595e81b8fc7dc8739b (patch) | |
| tree | e079f35c0aa2b58cf41675c66b7cfa96e6b068f6 /drivers | |
| parent | 8f3334edae93f8b664417f4140d4d9dc9a003fe4 (diff) | |
| download | linux-930e99bd1320d78c7d8866595e81b8fc7dc8739b.tar.xz | |
[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')
| -rw-r--r-- | drivers/scsi/scsi_tgt_if.c | 8 |
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]; |