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ide-scsi: sg chaining support

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Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-10-16 11:20:52 +02:00
parent 2f08fe5221
commit d274a9878b
1 changed files with 18 additions and 14 deletions
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32
drivers/scsi/ide-scsi.c
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@ -70,6 +70,7 @@ typedef struct idescsi_pc_s {
u8 *buffer; /* Data buffer */
u8 *current_position; /* Pointer into the above buffer */
struct scatterlist *sg; /* Scatter gather table */
struct scatterlist *last_sg; /* Last sg element */
int b_count; /* Bytes transferred from current entry */
struct scsi_cmnd *scsi_cmd; /* SCSI command */
void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
@ -173,12 +174,6 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
char *buf;
while (bcount) {
if (pc->sg - scsi_sglist(pc->scsi_cmd) >
scsi_sg_count(pc->scsi_cmd)) {
printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
idescsi_discard_data (drive, bcount);
return;
}
count = min(pc->sg->length - pc->b_count, bcount);
if (PageHighMem(pc->sg->page)) {
unsigned long flags;
@ -197,10 +192,17 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
pc->sg++;
if (pc->sg == pc->last_sg)
break;
pc->sg = sg_next(pc->sg);
pc->b_count = 0;
}
}
if (bcount) {
printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
idescsi_discard_data (drive, bcount);
}
}
static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
@ -209,12 +211,6 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
char *buf;
while (bcount) {
if (pc->sg - scsi_sglist(pc->scsi_cmd) >
scsi_sg_count(pc->scsi_cmd)) {
printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
idescsi_output_zeros (drive, bcount);
return;
}
count = min(pc->sg->length - pc->b_count, bcount);
if (PageHighMem(pc->sg->page)) {
unsigned long flags;
@ -233,10 +229,17 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
pc->sg++;
if (pc->sg == pc->last_sg)
break;
pc->sg = sg_next(pc->sg);
pc->b_count = 0;
}
}
if (bcount) {
printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
idescsi_output_zeros (drive, bcount);
}
}
static void hexdump(u8 *x, int len)
@ -804,6 +807,7 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
pc->buffer = NULL;
pc->sg = scsi_sglist(cmd);
pc->last_sg = sg_last(pc->sg, cmd->use_sg);
pc->b_count = 0;
pc->request_transfer = pc->buffer_size = scsi_bufflen(cmd);
pc->scsi_cmd = cmd;