ide-tape: kill idetape_bh
Impact: kill now unnecessary idetape_bh With everything using standard mechanisms, there is no need for idetape_bh anymore. Kill it and use tape->buf, cur and valid to describe data buffer instead. Changes worth mentioning are... * idetape_queue_rq_tail() now always queue tape->buf and and adjusts buffer state properly before completion. * idetape_pad_zeros() clears the buffer only once. Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
Jens Axboe
parent
e998f30b45
commit
6cf3d545f7
|
|
@ -131,12 +131,6 @@ enum {
|
|||
IDETAPE_DIR_WRITE = (1 << 2),
|
||||
};
|
||||
|
||||
struct idetape_bh {
|
||||
u32 b_size;
|
||||
atomic_t b_count;
|
||||
char *b_data;
|
||||
};
|
||||
|
||||
/* Tape door status */
|
||||
#define DOOR_UNLOCKED 0
|
||||
#define DOOR_LOCKED 1
|
||||
|
|
@ -218,14 +212,12 @@ typedef struct ide_tape_obj {
|
|||
|
||||
/* Data buffer size chosen based on the tape's recommendation */
|
||||
int buffer_size;
|
||||
/* merge buffer */
|
||||
struct idetape_bh *merge_bh;
|
||||
/* size of the merge buffer */
|
||||
int merge_bh_size;
|
||||
/* pointer to current buffer head within the merge buffer */
|
||||
struct idetape_bh *bh;
|
||||
char *b_data;
|
||||
int b_count;
|
||||
/* Staging buffer of buffer_size bytes */
|
||||
void *buf;
|
||||
/* The read/write cursor */
|
||||
void *cur;
|
||||
/* The number of valid bytes in buf */
|
||||
size_t valid;
|
||||
|
||||
/* Measures average tape speed */
|
||||
unsigned long avg_time;
|
||||
|
|
@ -351,15 +343,6 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
|
|||
}
|
||||
}
|
||||
|
||||
/* Free data buffers completely. */
|
||||
static void ide_tape_kfree_buffer(idetape_tape_t *tape)
|
||||
{
|
||||
struct idetape_bh *bh = tape->merge_bh;
|
||||
|
||||
kfree(bh->b_data);
|
||||
kfree(bh);
|
||||
}
|
||||
|
||||
static void ide_tape_handle_dsc(ide_drive_t *);
|
||||
|
||||
static int ide_tape_callback(ide_drive_t *drive, int dsc)
|
||||
|
|
@ -603,8 +586,7 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
|
|||
struct ide_atapi_pc *pc, struct request *rq,
|
||||
u8 opcode)
|
||||
{
|
||||
struct idetape_bh *bh = (struct idetape_bh *)rq->special;
|
||||
unsigned int length = rq->current_nr_sectors;
|
||||
unsigned int length = rq->nr_sectors;
|
||||
|
||||
ide_init_pc(pc);
|
||||
put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
|
||||
|
|
@ -616,14 +598,11 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
|
|||
if (pc->req_xfer == tape->buffer_size)
|
||||
pc->flags |= PC_FLAG_DMA_OK;
|
||||
|
||||
if (opcode == READ_6) {
|
||||
if (opcode == READ_6)
|
||||
pc->c[0] = READ_6;
|
||||
atomic_set(&bh->b_count, 0);
|
||||
} else if (opcode == WRITE_6) {
|
||||
else if (opcode == WRITE_6) {
|
||||
pc->c[0] = WRITE_6;
|
||||
pc->flags |= PC_FLAG_WRITING;
|
||||
pc->b_data = bh->b_data;
|
||||
pc->b_count = atomic_read(&bh->b_count);
|
||||
}
|
||||
|
||||
memcpy(rq->cmd, pc->c, 12);
|
||||
|
|
@ -639,10 +618,8 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
|
|||
struct ide_cmd cmd;
|
||||
u8 stat;
|
||||
|
||||
debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
|
||||
" current_nr_sectors: %u\n",
|
||||
(unsigned long long)rq->sector, rq->nr_sectors,
|
||||
rq->current_nr_sectors);
|
||||
debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n"
|
||||
(unsigned long long)rq->sector, rq->nr_sectors);
|
||||
|
||||
if (!(blk_special_request(rq) || blk_sense_request(rq))) {
|
||||
/* We do not support buffer cache originated requests. */
|
||||
|
|
@ -748,89 +725,6 @@ out:
|
|||
return ide_tape_issue_pc(drive, &cmd, pc);
|
||||
}
|
||||
|
||||
/*
|
||||
* It returns a pointer to the newly allocated buffer, or NULL in case
|
||||
* of failure.
|
||||
*/
|
||||
static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
|
||||
int full)
|
||||
{
|
||||
struct idetape_bh *bh;
|
||||
|
||||
bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
|
||||
if (!bh)
|
||||
return NULL;
|
||||
|
||||
bh->b_data = kmalloc(tape->buffer_size, GFP_KERNEL);
|
||||
if (!bh->b_data) {
|
||||
kfree(bh);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
bh->b_size = tape->buffer_size;
|
||||
atomic_set(&bh->b_count, full ? bh->b_size : 0);
|
||||
|
||||
return bh;
|
||||
}
|
||||
|
||||
static int idetape_copy_stage_from_user(idetape_tape_t *tape,
|
||||
const char __user *buf, int n)
|
||||
{
|
||||
struct idetape_bh *bh = tape->bh;
|
||||
int ret = 0;
|
||||
|
||||
if (n) {
|
||||
if (bh == NULL || n > bh->b_size - atomic_read(&bh->b_count)) {
|
||||
printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
|
||||
__func__);
|
||||
return 1;
|
||||
}
|
||||
if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
|
||||
n))
|
||||
ret = 1;
|
||||
atomic_add(n, &bh->b_count);
|
||||
if (atomic_read(&bh->b_count) == bh->b_size)
|
||||
tape->bh = NULL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
|
||||
int n)
|
||||
{
|
||||
struct idetape_bh *bh = tape->bh;
|
||||
int ret = 0;
|
||||
|
||||
if (n) {
|
||||
if (bh == NULL || n > tape->b_count) {
|
||||
printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
|
||||
__func__);
|
||||
return 1;
|
||||
}
|
||||
if (copy_to_user(buf, tape->b_data, n))
|
||||
ret = 1;
|
||||
tape->b_data += n;
|
||||
tape->b_count -= n;
|
||||
if (!tape->b_count)
|
||||
tape->bh = NULL;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void idetape_init_merge_buffer(idetape_tape_t *tape)
|
||||
{
|
||||
struct idetape_bh *bh = tape->merge_bh;
|
||||
tape->bh = tape->merge_bh;
|
||||
|
||||
if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
|
||||
atomic_set(&bh->b_count, 0);
|
||||
else {
|
||||
tape->b_data = bh->b_data;
|
||||
tape->b_count = atomic_read(&bh->b_count);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Write a filemark if write_filemark=1. Flush the device buffers without
|
||||
* writing a filemark otherwise.
|
||||
|
|
@ -928,10 +822,10 @@ static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
|
|||
return;
|
||||
|
||||
clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
|
||||
tape->merge_bh_size = 0;
|
||||
if (tape->merge_bh != NULL) {
|
||||
ide_tape_kfree_buffer(tape);
|
||||
tape->merge_bh = NULL;
|
||||
tape->valid = 0;
|
||||
if (tape->buf != NULL) {
|
||||
kfree(tape->buf);
|
||||
tape->buf = NULL;
|
||||
}
|
||||
|
||||
tape->chrdev_dir = IDETAPE_DIR_NONE;
|
||||
|
|
@ -985,8 +879,7 @@ 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,
|
||||
struct idetape_bh *bh)
|
||||
static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks)
|
||||
{
|
||||
idetape_tape_t *tape = drive->driver_data;
|
||||
size_t size = blocks * tape->blk_size;
|
||||
|
|
@ -1000,11 +893,10 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
|
|||
rq->cmd_type = REQ_TYPE_SPECIAL;
|
||||
rq->cmd[13] = cmd;
|
||||
rq->rq_disk = tape->disk;
|
||||
rq->special = (void *)bh;
|
||||
rq->sector = tape->first_frame;
|
||||
|
||||
if (size) {
|
||||
ret = blk_rq_map_kern(drive->queue, rq, bh->b_data, size,
|
||||
ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
|
||||
__GFP_WAIT);
|
||||
if (ret)
|
||||
goto out_put;
|
||||
|
|
@ -1012,17 +904,17 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
|
|||
|
||||
blk_execute_rq(drive->queue, tape->disk, rq, 0);
|
||||
|
||||
/* calculate the number of transferred bytes and update bh */
|
||||
/* calculate the number of transferred bytes and update buffer state */
|
||||
size -= rq->data_len;
|
||||
tape->cur = tape->buf;
|
||||
if (cmd == REQ_IDETAPE_READ)
|
||||
atomic_add(size, &bh->b_count);
|
||||
tape->valid = size;
|
||||
else
|
||||
tape->valid = 0;
|
||||
|
||||
ret = size;
|
||||
if (rq->errors == IDE_DRV_ERROR_GENERAL)
|
||||
ret = -EIO;
|
||||
|
||||
if (tape->merge_bh)
|
||||
idetape_init_merge_buffer(tape);
|
||||
out_put:
|
||||
blk_put_request(rq);
|
||||
return ret;
|
||||
|
|
@ -1064,49 +956,33 @@ 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)
|
||||
{
|
||||
idetape_tape_t *tape = drive->driver_data;
|
||||
|
||||
debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
|
||||
|
||||
return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
|
||||
blocks, tape->merge_bh);
|
||||
return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks);
|
||||
}
|
||||
|
||||
static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
|
||||
{
|
||||
idetape_tape_t *tape = drive->driver_data;
|
||||
int blocks;
|
||||
struct idetape_bh *bh;
|
||||
|
||||
if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
|
||||
printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
|
||||
" but we are not writing.\n");
|
||||
return;
|
||||
}
|
||||
if (tape->merge_bh_size > tape->buffer_size) {
|
||||
printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
|
||||
tape->merge_bh_size = tape->buffer_size;
|
||||
}
|
||||
if (tape->merge_bh_size) {
|
||||
blocks = tape->merge_bh_size / tape->blk_size;
|
||||
if (tape->merge_bh_size % tape->blk_size) {
|
||||
unsigned int i = tape->blk_size -
|
||||
tape->merge_bh_size % tape->blk_size;
|
||||
if (tape->buf) {
|
||||
blocks = tape->valid / tape->blk_size;
|
||||
if (tape->valid % tape->blk_size) {
|
||||
blocks++;
|
||||
bh = tape->bh;
|
||||
if (bh) {
|
||||
memset(bh->b_data + atomic_read(&bh->b_count),
|
||||
0, i);
|
||||
atomic_add(i, &bh->b_count);
|
||||
} else
|
||||
printk(KERN_INFO "ide-tape: bug, bh NULL\n");
|
||||
memset(tape->buf + tape->valid, 0,
|
||||
tape->blk_size - tape->valid % tape->blk_size);
|
||||
}
|
||||
(void) idetape_add_chrdev_write_request(drive, blocks);
|
||||
tape->merge_bh_size = 0;
|
||||
}
|
||||
if (tape->merge_bh != NULL) {
|
||||
ide_tape_kfree_buffer(tape);
|
||||
tape->merge_bh = NULL;
|
||||
if (tape->buf != NULL) {
|
||||
kfree(tape->buf);
|
||||
tape->buf = NULL;
|
||||
}
|
||||
tape->chrdev_dir = IDETAPE_DIR_NONE;
|
||||
}
|
||||
|
|
@ -1122,15 +998,15 @@ static int idetape_init_read(ide_drive_t *drive)
|
|||
ide_tape_flush_merge_buffer(drive);
|
||||
idetape_flush_tape_buffers(drive);
|
||||
}
|
||||
if (tape->merge_bh || tape->merge_bh_size) {
|
||||
printk(KERN_ERR "ide-tape: merge_bh_size should be"
|
||||
" 0 now\n");
|
||||
tape->merge_bh_size = 0;
|
||||
if (tape->buf || tape->valid) {
|
||||
printk(KERN_ERR "ide-tape: valid should be 0 now\n");
|
||||
tape->valid = 0;
|
||||
}
|
||||
tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0);
|
||||
if (!tape->merge_bh)
|
||||
tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
|
||||
if (!tape->buf)
|
||||
return -ENOMEM;
|
||||
tape->chrdev_dir = IDETAPE_DIR_READ;
|
||||
tape->cur = tape->buf;
|
||||
|
||||
/*
|
||||
* Issue a read 0 command to ensure that DSC handshake is
|
||||
|
|
@ -1140,11 +1016,10 @@ static int idetape_init_read(ide_drive_t *drive)
|
|||
*/
|
||||
if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
|
||||
bytes_read = idetape_queue_rw_tail(drive,
|
||||
REQ_IDETAPE_READ, 0,
|
||||
tape->merge_bh);
|
||||
REQ_IDETAPE_READ, 0);
|
||||
if (bytes_read < 0) {
|
||||
ide_tape_kfree_buffer(tape);
|
||||
tape->merge_bh = NULL;
|
||||
kfree(tape->buf);
|
||||
tape->buf = NULL;
|
||||
tape->chrdev_dir = IDETAPE_DIR_NONE;
|
||||
return bytes_read;
|
||||
}
|
||||
|
|
@ -1157,8 +1032,6 @@ static int idetape_init_read(ide_drive_t *drive)
|
|||
/* called from idetape_chrdev_read() to service a chrdev read request. */
|
||||
static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
|
||||
{
|
||||
idetape_tape_t *tape = drive->driver_data;
|
||||
|
||||
debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
|
||||
|
||||
/* If we are at a filemark, return a read length of 0 */
|
||||
|
|
@ -1167,27 +1040,21 @@ static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
|
|||
|
||||
idetape_init_read(drive);
|
||||
|
||||
return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
|
||||
tape->merge_bh);
|
||||
return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks);
|
||||
}
|
||||
|
||||
static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
|
||||
{
|
||||
idetape_tape_t *tape = drive->driver_data;
|
||||
struct idetape_bh *bh = tape->merge_bh;
|
||||
int blocks;
|
||||
|
||||
memset(tape->buf, 0, tape->buffer_size);
|
||||
|
||||
while (bcount) {
|
||||
unsigned int count;
|
||||
unsigned int count = min(tape->buffer_size, bcount);
|
||||
|
||||
count = min(tape->buffer_size, bcount);
|
||||
idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
|
||||
count / tape->blk_size);
|
||||
bcount -= count;
|
||||
blocks = count / tape->blk_size;
|
||||
atomic_set(&bh->b_count, count);
|
||||
memset(bh->b_data, 0, atomic_read(&bh->b_count));
|
||||
|
||||
idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
|
||||
tape->merge_bh);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -1267,7 +1134,7 @@ static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
|
|||
}
|
||||
|
||||
if (tape->chrdev_dir == IDETAPE_DIR_READ) {
|
||||
tape->merge_bh_size = 0;
|
||||
tape->valid = 0;
|
||||
if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
|
||||
++count;
|
||||
ide_tape_discard_merge_buffer(drive, 0);
|
||||
|
|
@ -1333,20 +1200,20 @@ static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
|
|||
return rc;
|
||||
if (count == 0)
|
||||
return (0);
|
||||
if (tape->merge_bh_size) {
|
||||
actually_read = min((unsigned int)(tape->merge_bh_size),
|
||||
(unsigned int)count);
|
||||
if (idetape_copy_stage_to_user(tape, buf, actually_read))
|
||||
if (tape->valid) {
|
||||
actually_read = min_t(unsigned int, tape->valid, count);
|
||||
if (copy_to_user(buf, tape->cur, actually_read))
|
||||
ret = -EFAULT;
|
||||
buf += actually_read;
|
||||
tape->merge_bh_size -= actually_read;
|
||||
count -= actually_read;
|
||||
tape->cur += actually_read;
|
||||
tape->valid -= actually_read;
|
||||
}
|
||||
while (count >= tape->buffer_size) {
|
||||
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
|
||||
if (bytes_read <= 0)
|
||||
goto finish;
|
||||
if (idetape_copy_stage_to_user(tape, buf, bytes_read))
|
||||
if (copy_to_user(buf, tape->cur, bytes_read))
|
||||
ret = -EFAULT;
|
||||
buf += bytes_read;
|
||||
count -= bytes_read;
|
||||
|
|
@ -1357,10 +1224,11 @@ static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
|
|||
if (bytes_read <= 0)
|
||||
goto finish;
|
||||
temp = min((unsigned long)count, (unsigned long)bytes_read);
|
||||
if (idetape_copy_stage_to_user(tape, buf, temp))
|
||||
if (copy_to_user(buf, tape->cur, temp))
|
||||
ret = -EFAULT;
|
||||
actually_read += temp;
|
||||
tape->merge_bh_size = bytes_read-temp;
|
||||
tape->cur += temp;
|
||||
tape->valid -= temp;
|
||||
}
|
||||
finish:
|
||||
if (!actually_read && test_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags)) {
|
||||
|
|
@ -1392,16 +1260,15 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
|
|||
if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
|
||||
if (tape->chrdev_dir == IDETAPE_DIR_READ)
|
||||
ide_tape_discard_merge_buffer(drive, 1);
|
||||
if (tape->merge_bh || tape->merge_bh_size) {
|
||||
printk(KERN_ERR "ide-tape: merge_bh_size "
|
||||
"should be 0 now\n");
|
||||
tape->merge_bh_size = 0;
|
||||
if (tape->buf || tape->valid) {
|
||||
printk(KERN_ERR "ide-tape: valid should be 0 now\n");
|
||||
tape->valid = 0;
|
||||
}
|
||||
tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0);
|
||||
if (!tape->merge_bh)
|
||||
tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
|
||||
if (!tape->buf)
|
||||
return -ENOMEM;
|
||||
tape->chrdev_dir = IDETAPE_DIR_WRITE;
|
||||
idetape_init_merge_buffer(tape);
|
||||
tape->cur = tape->buf;
|
||||
|
||||
/*
|
||||
* Issue a write 0 command to ensure that DSC handshake is
|
||||
|
|
@ -1411,11 +1278,10 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
|
|||
*/
|
||||
if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
|
||||
ssize_t retval = idetape_queue_rw_tail(drive,
|
||||
REQ_IDETAPE_WRITE, 0,
|
||||
tape->merge_bh);
|
||||
REQ_IDETAPE_WRITE, 0);
|
||||
if (retval < 0) {
|
||||
ide_tape_kfree_buffer(tape);
|
||||
tape->merge_bh = NULL;
|
||||
kfree(tape->buf);
|
||||
tape->buf = NULL;
|
||||
tape->chrdev_dir = IDETAPE_DIR_NONE;
|
||||
return retval;
|
||||
}
|
||||
|
|
@ -1423,23 +1289,19 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
|
|||
}
|
||||
if (count == 0)
|
||||
return (0);
|
||||
if (tape->merge_bh_size) {
|
||||
if (tape->merge_bh_size >= tape->buffer_size) {
|
||||
printk(KERN_ERR "ide-tape: bug: merge buf too big\n");
|
||||
tape->merge_bh_size = 0;
|
||||
}
|
||||
actually_written = min((unsigned int)
|
||||
(tape->buffer_size - tape->merge_bh_size),
|
||||
(unsigned int)count);
|
||||
if (idetape_copy_stage_from_user(tape, buf, actually_written))
|
||||
ret = -EFAULT;
|
||||
if (tape->valid < tape->buffer_size) {
|
||||
actually_written = min_t(unsigned int,
|
||||
tape->buffer_size - tape->valid,
|
||||
count);
|
||||
if (copy_from_user(tape->cur, buf, actually_written))
|
||||
ret = -EFAULT;
|
||||
buf += actually_written;
|
||||
tape->merge_bh_size += actually_written;
|
||||
count -= actually_written;
|
||||
tape->cur += actually_written;
|
||||
tape->valid += actually_written;
|
||||
|
||||
if (tape->merge_bh_size == tape->buffer_size) {
|
||||
if (tape->valid == tape->buffer_size) {
|
||||
ssize_t retval;
|
||||
tape->merge_bh_size = 0;
|
||||
retval = idetape_add_chrdev_write_request(drive, ctl);
|
||||
if (retval <= 0)
|
||||
return (retval);
|
||||
|
|
@ -1447,7 +1309,7 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
|
|||
}
|
||||
while (count >= tape->buffer_size) {
|
||||
ssize_t retval;
|
||||
if (idetape_copy_stage_from_user(tape, buf, tape->buffer_size))
|
||||
if (copy_from_user(tape->cur, buf, tape->buffer_size))
|
||||
ret = -EFAULT;
|
||||
buf += tape->buffer_size;
|
||||
count -= tape->buffer_size;
|
||||
|
|
@ -1458,9 +1320,10 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
|
|||
}
|
||||
if (count) {
|
||||
actually_written += count;
|
||||
if (idetape_copy_stage_from_user(tape, buf, count))
|
||||
if (copy_from_user(tape->cur, buf, count))
|
||||
ret = -EFAULT;
|
||||
tape->merge_bh_size += count;
|
||||
tape->cur += count;
|
||||
tape->valid += count;
|
||||
}
|
||||
return ret ? ret : actually_written;
|
||||
}
|
||||
|
|
@ -1623,7 +1486,7 @@ static int idetape_chrdev_ioctl(struct inode *inode, struct file *file,
|
|||
idetape_flush_tape_buffers(drive);
|
||||
}
|
||||
if (cmd == MTIOCGET || cmd == MTIOCPOS) {
|
||||
block_offset = tape->merge_bh_size /
|
||||
block_offset = tape->valid /
|
||||
(tape->blk_size * tape->user_bs_factor);
|
||||
position = idetape_read_position(drive);
|
||||
if (position < 0)
|
||||
|
|
@ -1771,12 +1634,12 @@ static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
|
|||
idetape_tape_t *tape = drive->driver_data;
|
||||
|
||||
ide_tape_flush_merge_buffer(drive);
|
||||
tape->merge_bh = ide_tape_kmalloc_buffer(tape, 1);
|
||||
if (tape->merge_bh != NULL) {
|
||||
tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
|
||||
if (tape->buf != NULL) {
|
||||
idetape_pad_zeros(drive, tape->blk_size *
|
||||
(tape->user_bs_factor - 1));
|
||||
ide_tape_kfree_buffer(tape);
|
||||
tape->merge_bh = NULL;
|
||||
kfree(tape->buf);
|
||||
tape->buf = NULL;
|
||||
}
|
||||
idetape_write_filemark(drive);
|
||||
idetape_flush_tape_buffers(drive);
|
||||
|
|
@ -2042,7 +1905,7 @@ static void ide_tape_release(struct device *dev)
|
|||
ide_drive_t *drive = tape->drive;
|
||||
struct gendisk *g = tape->disk;
|
||||
|
||||
BUG_ON(tape->merge_bh_size);
|
||||
BUG_ON(tape->valid);
|
||||
|
||||
drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
|
||||
drive->driver_data = NULL;
|
||||
|
|
|
|||
Loading…
Reference in New Issue