mirror of https://gitee.com/openkylin/linux.git
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
parent
21d9c5d227
commit
963da55c4b
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@ -131,12 +131,6 @@ enum {
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IDETAPE_DIR_WRITE = (1 << 2),
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};
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struct idetape_bh {
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u32 b_size;
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atomic_t b_count;
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char *b_data;
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};
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/* Tape door status */
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#define DOOR_UNLOCKED 0
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#define DOOR_LOCKED 1
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@ -218,14 +212,12 @@ typedef struct ide_tape_obj {
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/* Data buffer size chosen based on the tape's recommendation */
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int buffer_size;
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/* merge buffer */
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struct idetape_bh *merge_bh;
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/* size of the merge buffer */
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int merge_bh_size;
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/* pointer to current buffer head within the merge buffer */
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struct idetape_bh *bh;
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char *b_data;
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int b_count;
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/* Staging buffer of buffer_size bytes */
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void *buf;
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/* The read/write cursor */
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void *cur;
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/* The number of valid bytes in buf */
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size_t valid;
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/* Measures average tape speed */
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unsigned long avg_time;
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@ -351,15 +343,6 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
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}
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}
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/* Free data buffers completely. */
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static void ide_tape_kfree_buffer(idetape_tape_t *tape)
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{
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struct idetape_bh *bh = tape->merge_bh;
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kfree(bh->b_data);
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kfree(bh);
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}
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static void ide_tape_handle_dsc(ide_drive_t *);
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static int ide_tape_callback(ide_drive_t *drive, int dsc)
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@ -603,8 +586,7 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
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struct ide_atapi_pc *pc, struct request *rq,
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u8 opcode)
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{
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struct idetape_bh *bh = (struct idetape_bh *)rq->special;
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unsigned int length = rq->current_nr_sectors;
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unsigned int length = rq->nr_sectors;
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ide_init_pc(pc);
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put_unaligned(cpu_to_be32(length), (unsigned int *) &pc->c[1]);
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@ -616,14 +598,11 @@ static void ide_tape_create_rw_cmd(idetape_tape_t *tape,
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if (pc->req_xfer == tape->buffer_size)
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pc->flags |= PC_FLAG_DMA_OK;
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if (opcode == READ_6) {
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if (opcode == READ_6)
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pc->c[0] = READ_6;
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atomic_set(&bh->b_count, 0);
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} else if (opcode == WRITE_6) {
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else if (opcode == WRITE_6) {
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pc->c[0] = WRITE_6;
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pc->flags |= PC_FLAG_WRITING;
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pc->b_data = bh->b_data;
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pc->b_count = atomic_read(&bh->b_count);
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}
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memcpy(rq->cmd, pc->c, 12);
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@ -639,10 +618,8 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
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struct ide_cmd cmd;
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u8 stat;
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debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu,"
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" current_nr_sectors: %u\n",
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(unsigned long long)rq->sector, rq->nr_sectors,
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rq->current_nr_sectors);
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debug_log(DBG_SENSE, "sector: %llu, nr_sectors: %lu\n"
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(unsigned long long)rq->sector, rq->nr_sectors);
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if (!(blk_special_request(rq) || blk_sense_request(rq))) {
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/* We do not support buffer cache originated requests. */
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@ -748,89 +725,6 @@ static ide_startstop_t idetape_do_request(ide_drive_t *drive,
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return ide_tape_issue_pc(drive, &cmd, pc);
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}
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/*
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* It returns a pointer to the newly allocated buffer, or NULL in case
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* of failure.
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*/
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static struct idetape_bh *ide_tape_kmalloc_buffer(idetape_tape_t *tape,
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int full)
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{
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struct idetape_bh *bh;
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bh = kmalloc(sizeof(struct idetape_bh), GFP_KERNEL);
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if (!bh)
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return NULL;
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bh->b_data = kmalloc(tape->buffer_size, GFP_KERNEL);
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if (!bh->b_data) {
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kfree(bh);
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return NULL;
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}
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bh->b_size = tape->buffer_size;
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atomic_set(&bh->b_count, full ? bh->b_size : 0);
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return bh;
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}
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static int idetape_copy_stage_from_user(idetape_tape_t *tape,
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const char __user *buf, int n)
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{
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struct idetape_bh *bh = tape->bh;
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int ret = 0;
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if (n) {
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if (bh == NULL || n > bh->b_size - atomic_read(&bh->b_count)) {
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printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
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__func__);
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return 1;
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}
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if (copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf,
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n))
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ret = 1;
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atomic_add(n, &bh->b_count);
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if (atomic_read(&bh->b_count) == bh->b_size)
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tape->bh = NULL;
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}
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return ret;
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}
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static int idetape_copy_stage_to_user(idetape_tape_t *tape, char __user *buf,
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int n)
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{
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struct idetape_bh *bh = tape->bh;
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int ret = 0;
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if (n) {
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if (bh == NULL || n > tape->b_count) {
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printk(KERN_ERR "ide-tape: bh == NULL in %s\n",
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__func__);
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return 1;
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}
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if (copy_to_user(buf, tape->b_data, n))
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ret = 1;
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tape->b_data += n;
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tape->b_count -= n;
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if (!tape->b_count)
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tape->bh = NULL;
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}
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return ret;
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}
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static void idetape_init_merge_buffer(idetape_tape_t *tape)
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{
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struct idetape_bh *bh = tape->merge_bh;
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tape->bh = tape->merge_bh;
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if (tape->chrdev_dir == IDETAPE_DIR_WRITE)
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atomic_set(&bh->b_count, 0);
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else {
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tape->b_data = bh->b_data;
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tape->b_count = atomic_read(&bh->b_count);
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}
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}
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/*
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* Write a filemark if write_filemark=1. Flush the device buffers without
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* writing a filemark otherwise.
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@ -928,10 +822,10 @@ static void __ide_tape_discard_merge_buffer(ide_drive_t *drive)
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return;
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clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags);
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tape->merge_bh_size = 0;
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if (tape->merge_bh != NULL) {
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ide_tape_kfree_buffer(tape);
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tape->merge_bh = NULL;
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tape->valid = 0;
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if (tape->buf != NULL) {
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kfree(tape->buf);
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tape->buf = NULL;
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}
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tape->chrdev_dir = IDETAPE_DIR_NONE;
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@ -985,8 +879,7 @@ static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
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* Generate a read/write request for the block device interface and wait for it
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* to be serviced.
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*/
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static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
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struct idetape_bh *bh)
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static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks)
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{
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idetape_tape_t *tape = drive->driver_data;
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size_t size = blocks * tape->blk_size;
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@ -1000,11 +893,10 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
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rq->cmd_type = REQ_TYPE_SPECIAL;
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rq->cmd[13] = cmd;
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rq->rq_disk = tape->disk;
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rq->special = (void *)bh;
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rq->sector = tape->first_frame;
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if (size) {
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ret = blk_rq_map_kern(drive->queue, rq, bh->b_data, size,
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ret = blk_rq_map_kern(drive->queue, rq, tape->buf, size,
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__GFP_WAIT);
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if (ret)
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goto out_put;
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@ -1012,17 +904,17 @@ static int idetape_queue_rw_tail(ide_drive_t *drive, int cmd, int blocks,
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blk_execute_rq(drive->queue, tape->disk, rq, 0);
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/* calculate the number of transferred bytes and update bh */
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/* calculate the number of transferred bytes and update buffer state */
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size -= rq->data_len;
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tape->cur = tape->buf;
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if (cmd == REQ_IDETAPE_READ)
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atomic_add(size, &bh->b_count);
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tape->valid = size;
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else
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tape->valid = 0;
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ret = size;
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if (rq->errors == IDE_DRV_ERROR_GENERAL)
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ret = -EIO;
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if (tape->merge_bh)
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idetape_init_merge_buffer(tape);
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out_put:
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blk_put_request(rq);
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return ret;
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@ -1064,49 +956,33 @@ static void idetape_create_space_cmd(struct ide_atapi_pc *pc, int count, u8 cmd)
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/* Queue up a character device originated write request. */
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static int idetape_add_chrdev_write_request(ide_drive_t *drive, int blocks)
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{
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idetape_tape_t *tape = drive->driver_data;
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debug_log(DBG_CHRDEV, "Enter %s\n", __func__);
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return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
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blocks, tape->merge_bh);
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return idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks);
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}
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static void ide_tape_flush_merge_buffer(ide_drive_t *drive)
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{
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idetape_tape_t *tape = drive->driver_data;
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int blocks;
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struct idetape_bh *bh;
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if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
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printk(KERN_ERR "ide-tape: bug: Trying to empty merge buffer"
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" but we are not writing.\n");
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return;
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}
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if (tape->merge_bh_size > tape->buffer_size) {
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printk(KERN_ERR "ide-tape: bug: merge_buffer too big\n");
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tape->merge_bh_size = tape->buffer_size;
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}
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if (tape->merge_bh_size) {
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blocks = tape->merge_bh_size / tape->blk_size;
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if (tape->merge_bh_size % tape->blk_size) {
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unsigned int i = tape->blk_size -
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tape->merge_bh_size % tape->blk_size;
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if (tape->buf) {
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blocks = tape->valid / tape->blk_size;
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if (tape->valid % tape->blk_size) {
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blocks++;
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bh = tape->bh;
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if (bh) {
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memset(bh->b_data + atomic_read(&bh->b_count),
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0, i);
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atomic_add(i, &bh->b_count);
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} else
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printk(KERN_INFO "ide-tape: bug, bh NULL\n");
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memset(tape->buf + tape->valid, 0,
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tape->blk_size - tape->valid % tape->blk_size);
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}
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(void) idetape_add_chrdev_write_request(drive, blocks);
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tape->merge_bh_size = 0;
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}
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if (tape->merge_bh != NULL) {
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ide_tape_kfree_buffer(tape);
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tape->merge_bh = NULL;
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if (tape->buf != NULL) {
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kfree(tape->buf);
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tape->buf = NULL;
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}
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tape->chrdev_dir = IDETAPE_DIR_NONE;
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}
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@ -1122,15 +998,15 @@ static int idetape_init_read(ide_drive_t *drive)
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ide_tape_flush_merge_buffer(drive);
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idetape_flush_tape_buffers(drive);
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}
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if (tape->merge_bh || tape->merge_bh_size) {
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printk(KERN_ERR "ide-tape: merge_bh_size should be"
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" 0 now\n");
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tape->merge_bh_size = 0;
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if (tape->buf || tape->valid) {
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printk(KERN_ERR "ide-tape: valid should be 0 now\n");
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tape->valid = 0;
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}
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tape->merge_bh = ide_tape_kmalloc_buffer(tape, 0);
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if (!tape->merge_bh)
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tape->buf = kmalloc(tape->buffer_size, GFP_KERNEL);
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if (!tape->buf)
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return -ENOMEM;
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tape->chrdev_dir = IDETAPE_DIR_READ;
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tape->cur = tape->buf;
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/*
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* Issue a read 0 command to ensure that DSC handshake is
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@ -1140,11 +1016,10 @@ static int idetape_init_read(ide_drive_t *drive)
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*/
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if (drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) {
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bytes_read = idetape_queue_rw_tail(drive,
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REQ_IDETAPE_READ, 0,
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tape->merge_bh);
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REQ_IDETAPE_READ, 0);
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if (bytes_read < 0) {
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ide_tape_kfree_buffer(tape);
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tape->merge_bh = NULL;
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kfree(tape->buf);
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tape->buf = NULL;
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tape->chrdev_dir = IDETAPE_DIR_NONE;
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return bytes_read;
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}
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@ -1157,8 +1032,6 @@ static int idetape_init_read(ide_drive_t *drive)
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/* called from idetape_chrdev_read() to service a chrdev read request. */
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static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
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{
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idetape_tape_t *tape = drive->driver_data;
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debug_log(DBG_PROCS, "Enter %s, %d blocks\n", __func__, blocks);
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/* If we are at a filemark, return a read length of 0 */
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@ -1167,27 +1040,21 @@ static int idetape_add_chrdev_read_request(ide_drive_t *drive, int blocks)
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idetape_init_read(drive);
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return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
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tape->merge_bh);
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return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks);
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}
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static void idetape_pad_zeros(ide_drive_t *drive, int bcount)
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{
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idetape_tape_t *tape = drive->driver_data;
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struct idetape_bh *bh = tape->merge_bh;
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int blocks;
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memset(tape->buf, 0, tape->buffer_size);
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while (bcount) {
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unsigned int count;
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unsigned int count = min(tape->buffer_size, bcount);
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count = min(tape->buffer_size, bcount);
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idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE,
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count / tape->blk_size);
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bcount -= count;
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blocks = count / tape->blk_size;
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atomic_set(&bh->b_count, count);
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memset(bh->b_data, 0, atomic_read(&bh->b_count));
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idetape_queue_rw_tail(drive, REQ_IDETAPE_WRITE, blocks,
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tape->merge_bh);
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}
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}
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@ -1267,7 +1134,7 @@ static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
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}
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if (tape->chrdev_dir == IDETAPE_DIR_READ) {
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tape->merge_bh_size = 0;
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tape->valid = 0;
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if (test_and_clear_bit(IDE_AFLAG_FILEMARK, &drive->atapi_flags))
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++count;
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ide_tape_discard_merge_buffer(drive, 0);
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@ -1333,20 +1200,20 @@ static ssize_t idetape_chrdev_read(struct file *file, char __user *buf,
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return rc;
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if (count == 0)
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return (0);
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if (tape->merge_bh_size) {
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actually_read = min((unsigned int)(tape->merge_bh_size),
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(unsigned int)count);
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if (idetape_copy_stage_to_user(tape, buf, actually_read))
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if (tape->valid) {
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actually_read = min_t(unsigned int, tape->valid, count);
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if (copy_to_user(buf, tape->cur, actually_read))
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ret = -EFAULT;
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buf += actually_read;
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tape->merge_bh_size -= actually_read;
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count -= actually_read;
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tape->cur += actually_read;
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tape->valid -= actually_read;
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}
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while (count >= tape->buffer_size) {
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bytes_read = idetape_add_chrdev_read_request(drive, ctl);
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if (bytes_read <= 0)
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goto finish;
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if (idetape_copy_stage_to_user(tape, buf, bytes_read))
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if (copy_to_user(buf, tape->cur, bytes_read))
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ret = -EFAULT;
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buf += bytes_read;
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count -= bytes_read;
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@ -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