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libata: implement ata_qc_raw_nbytes()

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Implement ata_qc_raw_nbytes() which determines the raw user-requested
size of a PC command.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2008-03-18 17:47:43 +09:00
committed by Jeff Garzik
parent cc7feea39b
commit aacda37538
2 changed files with 18 additions and 4 deletions
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8
include/linux/libata.h
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@@ -463,6 +463,7 @@ struct ata_queued_cmd {
unsigned int sect_size;
unsigned int nbytes;
unsigned int extrabytes;
unsigned int curbytes;
struct scatterlist *cursg;
@@ -1336,6 +1337,11 @@ static inline struct ata_queued_cmd *ata_qc_from_tag(struct ata_port *ap,
return NULL;
}
static inline unsigned int ata_qc_raw_nbytes(struct ata_queued_cmd *qc)
{
return qc->nbytes - min(qc->extrabytes, qc->nbytes);
}
static inline void ata_tf_init(struct ata_device *dev, struct ata_taskfile *tf)
{
memset(tf, 0, sizeof(*tf));
@@ -1354,7 +1360,7 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
qc->flags = 0;
qc->cursg = NULL;
qc->cursg_ofs = 0;
qc->nbytes = qc->curbytes = 0;
qc->nbytes = qc->extrabytes = qc->curbytes = 0;
qc->n_elem = 0;
qc->err_mask = 0;
qc->sect_size = ATA_SECT_SIZE;