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ide: keep track of number of bytes instead of sectors in struct ide_cmd 

* Pass number of bytes instead of sectors to ide_init_sg_cmd().

* Pass number of bytes to process to ide_pio_sector() and rename
  it to ide_pio_bytes().

* Rename ->nsect field to ->nbytes in struct ide_cmd and use
  ->nbytes, ->nleft and ->cursg_ofs to keep track of number of
  bytes instead of sectors.

There should be no functional changes caused by this patch.

Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-03-27 12:46:47 +01:00
parent 35b5d0be3d
commit bf717c0a2e
5 changed files with 24 additions and 24 deletions
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4
drivers/ide/ide-disk.c
View File

@ -152,7 +152,7 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
cmd.rq = rq;
if (dma == 0) {
ide_init_sg_cmd(&cmd, nsectors);
ide_init_sg_cmd(&cmd, nsectors << 9);
ide_map_sg(drive, &cmd);
}
@ -162,7 +162,7 @@ static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
/* fallback to PIO */
cmd.tf_flags |= IDE_TFLAG_DMA_PIO_FALLBACK;
ide_tf_set_cmd(drive, &cmd, 0);
ide_init_sg_cmd(&cmd, nsectors);
ide_init_sg_cmd(&cmd, nsectors << 9);
rc = do_rw_taskfile(drive, &cmd);
}

2
drivers/ide/ide-floppy.c
View File

@ -294,7 +294,7 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
cmd.rq = rq;
if (blk_fs_request(rq) || pc->req_xfer) {
ide_init_sg_cmd(&cmd, rq->nr_sectors);
ide_init_sg_cmd(&cmd, rq->nr_sectors << 9);
ide_map_sg(drive, &cmd);
}

6
drivers/ide/ide-io.c
View File

@ -245,9 +245,9 @@ void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
}
EXPORT_SYMBOL_GPL(ide_map_sg);
void ide_init_sg_cmd(struct ide_cmd *cmd, int nsect)
void ide_init_sg_cmd(struct ide_cmd *cmd, unsigned int nr_bytes)
{
cmd->nsect = cmd->nleft = nsect;
cmd->nbytes = cmd->nleft = nr_bytes;
cmd->cursg_ofs = 0;
cmd->cursg = NULL;
}
@ -272,7 +272,7 @@ static ide_startstop_t execute_drive_cmd (ide_drive_t *drive,
if (cmd) {
if (cmd->protocol == ATA_PROT_PIO) {
ide_init_sg_cmd(cmd, rq->nr_sectors);
ide_init_sg_cmd(cmd, rq->nr_sectors << 9);
ide_map_sg(drive, cmd);
}

32
drivers/ide/ide-taskfile.c
View File

@ -188,8 +188,8 @@ static u8 wait_drive_not_busy(ide_drive_t *drive)
return stat;
}
static void ide_pio_sector(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write)
static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write, unsigned int nr_bytes)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
@ -208,7 +208,7 @@ static void ide_pio_sector(ide_drive_t *drive, struct ide_cmd *cmd,
}
page = sg_page(cursg);
offset = cursg->offset + cmd->cursg_ofs * SECTOR_SIZE;
offset = cursg->offset + cmd->cursg_ofs;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
@ -219,19 +219,19 @@ static void ide_pio_sector(ide_drive_t *drive, struct ide_cmd *cmd,
#endif
buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
cmd->nleft--;
cmd->cursg_ofs++;
cmd->nleft -= nr_bytes;
cmd->cursg_ofs += nr_bytes;
if ((cmd->cursg_ofs * SECTOR_SIZE) == cursg->length) {
if (cmd->cursg_ofs == cursg->length) {
cmd->cursg = sg_next(cmd->cursg);
cmd->cursg_ofs = 0;
}
/* do the actual data transfer */
if (write)
hwif->tp_ops->output_data(drive, cmd, buf, SECTOR_SIZE);
hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
else
hwif->tp_ops->input_data(drive, cmd, buf, SECTOR_SIZE);
hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
@ -244,9 +244,9 @@ static void ide_pio_multi(ide_drive_t *drive, struct ide_cmd *cmd,
{
unsigned int nsect;
nsect = min_t(unsigned int, cmd->nleft, drive->mult_count);
nsect = min_t(unsigned int, cmd->nleft >> 9, drive->mult_count);
while (nsect--)
ide_pio_sector(drive, cmd, write);
ide_pio_bytes(drive, cmd, write, SECTOR_SIZE);
}
static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
@ -265,7 +265,7 @@ static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
ide_pio_multi(drive, cmd, write);
else
ide_pio_sector(drive, cmd, write);
ide_pio_bytes(drive, cmd, write, SECTOR_SIZE);
drive->io_32bit = saved_io_32bit;
}
@ -273,18 +273,18 @@ static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
static void ide_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
{
if (cmd->tf_flags & IDE_TFLAG_FS) {
int sectors = cmd->nsect - cmd->nleft;
int nr_bytes = cmd->nbytes - cmd->nleft;
if (cmd->protocol == ATA_PROT_PIO &&
((cmd->tf_flags & IDE_TFLAG_WRITE) || cmd->nleft == 0)) {
if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
sectors -= drive->mult_count;
nr_bytes -= drive->mult_count << 9;
else
sectors--;
nr_bytes -= SECTOR_SIZE;
}
if (sectors > 0)
ide_complete_rq(drive, 0, sectors << 9);
if (nr_bytes > 0)
ide_complete_rq(drive, 0, nr_bytes);
}
}

4
include/linux/ide.h
View File

@ -350,7 +350,7 @@ struct ide_cmd {
int orig_sg_nents;
int sg_dma_direction; /* DMA transfer direction */
unsigned int nsect;
unsigned int nbytes;
unsigned int nleft;
struct scatterlist *cursg;
unsigned int cursg_ofs;
@ -1409,7 +1409,7 @@ int ide_pci_resume(struct pci_dev *);
#endif
void ide_map_sg(ide_drive_t *, struct ide_cmd *);
void ide_init_sg_cmd(struct ide_cmd *, int);
void ide_init_sg_cmd(struct ide_cmd *, unsigned int);
#define BAD_DMA_DRIVE 0
#define GOOD_DMA_DRIVE 1