From 6bb11dd14f70228f8dab25fd25dabeb9bc74926d Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Sun, 19 Apr 2009 08:46:03 +0900 Subject: [PATCH] ide-tape: use byte size instead of sectors on rw issue functions Impact: cleanup Byte size is what most issue functions deal with, make idetape_queue_rw_tail() and its wrappers take byte size instead of sector counts. idetape_chrdev_read() and write() functions are converted to use tape->buffer_size instead of ctl from tape->cap. This cleans up code a little bit and will ease the next r/w reimplementation. Signed-off-by: Tejun Heo --- drivers/ide/ide-tape.c | 45 +++++++++++++++++++----------------------- 1 file changed, 20 insertions(+), 25 deletions(-) diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c index 4da7fa9bca1e..d5e9bb286e30 100644 --- a/drivers/ide/ide-tape.c +++ b/drivers/ide/ide-tape.c @@ -879,15 +879,15 @@ static void ide_tape_discard_merge_buffer(ide_drive_t *drive, * Generate a read/write request for the block device interface and wait for it * to be serviced. */ -static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks) +static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int size) { idetape_tape_t *tape = drive->driver_data; - size_t size = blocks * tape->blk_size; struct request *rq; int ret; debug_log(DBG_SENSE, "%s: cmd=%d\n", __func__, cmd); BUG_ON(cmd != REQ_IDETAPE_READ && cmd != REQ_IDETAPE_WRITE); + BUG_ON(size < 0 || size % tape->blk_size); rq = blk_get_request(drive->queue, READ, __GFP_WAIT); rq->cmd_type = REQ_TYPE_SPECIAL; @@ -954,17 +954,16 @@ static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd) } /* Queue up a character device originated write request. */ -static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks) +static int idetape_add_chrdev_write_request(ide_drive_t *drive, int size) { debug_log(DBG_CHRDEV, "Enter %s\n", __func__); - return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks); + return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, size); } static void ide_tape_flush_merge_buffer(ide_drive_t *drive) { idetape_tape_t *tape = drive->driver_data; - int blocks; if (tape->chrdev_dir != IDETAPE_DIR_WRITE) { printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer" @@ -972,15 +971,10 @@ static void ide_tape_flush_merge_buffer(ide_drive_t *drive) return; } if (tape->buf) { - blocks = tape->valid / tape->blk_size; - if (tape->valid % tape->blk_size) { - blocks++; - memset(tape->buf + tape->valid, 0, - tape->blk_size - tape->valid % tape->blk_size); - } - (void) idetape_add_chrdev_write_request(drive, blocks); - } - if (tape->buf != NULL) { + size_t aligned = roundup(tape->valid, tape->blk_size); + + memset(tape->cur, 0, aligned - tape->valid); + idetape_add_chrdev_write_request(drive, aligned); kfree(tape->buf); tape->buf = NULL; } @@ -1038,9 +1032,9 @@ static int idetape_init_rw(ide_drive_t *drive, int dir) } /* called from idetape_chrdev_read() to service a chrdev read request. */ -static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) +static int idetape_add_chrdev_read_request(ide_drive_t *drive, int size) { - debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks); + debug_log(DBG_PROCS, "Enter %s, %d bytes\n", __func__, size); /* If we are at a filemark, return a read length of 0 */ if (test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) @@ -1048,7 +1042,7 @@ static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks) idetape_init_rw(drive, IDETAPE_DIR_READ); - return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks); + return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, size); } static void idetape_pad_zeros(ide_drive_t *drive, int bcount) @@ -1060,8 +1054,7 @@ static void idetape_pad_zeros(ide_drive_t *drive, int bcount) while (bcount) { unsigned int count = min(tape->buffer_size, bcount); - idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, - count / tape->blk_size); + idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, count); bcount -= count; } } @@ -1193,7 +1186,6 @@ static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, ide_drive_t *drive = tape->drive; ssize_t bytes_read, temp, actually_read = 0, rc; ssize_t ret = 0; - u16 ctl = *(u16 *)&tape->caps[12]; debug_log(DBG_CHRDEV, "Enter %s, count %Zd\n", __func__, count); @@ -1218,7 +1210,8 @@ static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, tape->valid -= actually_read; } while (count >= tape->buffer_size) { - bytes_read = idetape_add_chrdev_read_request(drive, ctl); + bytes_read = idetape_add_chrdev_read_request(drive, + tape->buffer_size); if (bytes_read <= 0) goto finish; if (copy_to_user(buf, tape->cur, bytes_read)) @@ -1228,7 +1221,8 @@ static ssize_t idetape_chrdev_read(struct file *file, char __user *buf, actually_read += bytes_read; } if (count) { - bytes_read = idetape_add_chrdev_read_request(drive, ctl); + bytes_read = idetape_add_chrdev_read_request(drive, + tape->buffer_size); if (bytes_read <= 0) goto finish; temp = min((unsigned long)count, (unsigned long)bytes_read); @@ -1256,7 +1250,6 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, ide_drive_t *drive = tape->drive; ssize_t actually_written = 0; ssize_t ret = 0; - u16 ctl = *(u16 *)&tape->caps[12]; int rc; /* The drive is write protected. */ @@ -1284,7 +1277,8 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, if (tape->valid == tape->buffer_size) { ssize_t retval; - retval = idetape_add_chrdev_write_request(drive, ctl); + retval = idetape_add_chrdev_write_request(drive, + tape->buffer_size); if (retval <= 0) return (retval); } @@ -1295,7 +1289,8 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf, ret = -EFAULT; buf += tape->buffer_size; count -= tape->buffer_size; - retval = idetape_add_chrdev_write_request(drive, ctl); + retval = idetape_add_chrdev_write_request(drive, + tape->buffer_size); actually_written += tape->buffer_size; if (retval <= 0) return (retval); -- 2.30.2