Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*/
-static const char *verstr = "20080504";
+static const char *verstr = "20081215";
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/string.h>
+#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/mtio.h>
#include <linux/cdrom.h>
static int modes_defined;
-static struct st_buffer *new_tape_buffer(int, int, int);
static int enlarge_buffer(struct st_buffer *, int, int);
static void clear_buffer(struct st_buffer *);
static void normalize_buffer(struct st_buffer *);
if (!debugging) { /* Abnormal conditions for tape */
if (!cmdstatp->have_sense)
printk(KERN_WARNING
- "%s: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n",
- name, result, suggestion(result),
- driver_byte(result) & DRIVER_MASK, host_byte(result));
+ "%s: Error %x (driver bt 0x%x, host bt 0x%x).\n",
+ name, result, driver_byte(result),
+ host_byte(result));
else if (cmdstatp->have_sense &&
scode != NO_SENSE &&
scode != RECOVERED_ERROR &&
struct scsi_tape *STp = SRpnt->stp;
STp->buffer->cmdstat.midlevel_result = SRpnt->result = req->errors;
- STp->buffer->cmdstat.residual = req->data_len;
+ STp->buffer->cmdstat.residual = req->resid_len;
if (SRpnt->waiting)
complete(SRpnt->waiting);
mdata->null_mapped = 1;
- err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, GFP_KERNEL);
- if (err) {
- blk_put_request(req);
- return DRIVER_ERROR << 24;
+ if (bufflen) {
+ err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen,
+ GFP_KERNEL);
+ if (err) {
+ blk_put_request(req);
+ return DRIVER_ERROR << 24;
+ }
}
SRpnt->bio = req->bio;
SRpnt->waiting = waiting;
if (STp->buffer->do_dio) {
+ mdata->page_order = 0;
mdata->nr_entries = STp->buffer->sg_segs;
mdata->pages = STp->buffer->mapped_pages;
} else {
+ mdata->page_order = STp->buffer->reserved_page_order;
mdata->nr_entries =
DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order);
- STp->buffer->map_data.pages = STp->buffer->reserved_pages;
- STp->buffer->map_data.offset = 0;
+ mdata->pages = STp->buffer->reserved_pages;
+ mdata->offset = 0;
}
memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
return SRpnt;
}
-static int st_scsi_kern_execute(struct st_request *streq,
- const unsigned char *cmd, int data_direction,
- void *buffer, unsigned bufflen, int timeout,
- int retries)
-{
- struct scsi_tape *stp = streq->stp;
- int ret, resid;
-
- stp->buffer->cmdstat.have_sense = 0;
- memcpy(streq->cmd, cmd, sizeof(streq->cmd));
-
- ret = scsi_execute(stp->device, cmd, data_direction, buffer, bufflen,
- streq->sense, timeout, retries, 0, &resid);
- if (driver_byte(ret) & DRIVER_ERROR)
- return -EBUSY;
-
- stp->buffer->cmdstat.midlevel_result = streq->result = ret;
- stp->buffer->cmdstat.residual = resid;
- stp->buffer->syscall_result = st_chk_result(stp, streq);
-
- return 0;
-}
/* Handle the write-behind checking (waits for completion). Returns -ENOSPC if
write has been correct but EOM early warning reached, -EIO if write ended in
{
struct st_request *SRpnt;
unsigned char cmd[MAX_COMMAND_SIZE];
- int ret;
cmd[0] = SPACE;
cmd[1] = 0x01; /* Space FileMarks */
DEBC(printk(ST_DEB_MSG "%s: Stepping over filemark %s.\n",
tape_name(STp), forward ? "forward" : "backward"));
- SRpnt = st_allocate_request(STp);
+ SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
+ STp->device->request_queue->rq_timeout,
+ MAX_RETRIES, 1);
if (!SRpnt)
- return STp->buffer->syscall_result;
-
- ret = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
- STp->device->request_queue->rq_timeout,
- MAX_RETRIES);
- if (ret)
- goto out;
+ return (STp->buffer)->syscall_result;
- ret = STp->buffer->syscall_result;
+ st_release_request(SRpnt);
+ SRpnt = NULL;
if ((STp->buffer)->cmdstat.midlevel_result != 0)
printk(KERN_ERR "%s: Stepping over filemark %s failed.\n",
tape_name(STp), forward ? "forward" : "backward");
-out:
- st_release_request(SRpnt);
-
- return ret;
+ return (STp->buffer)->syscall_result;
}
int attentions, waits, max_wait, scode;
int retval = CHKRES_READY, new_session = 0;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct st_request *SRpnt;
+ struct st_request *SRpnt = NULL;
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
- SRpnt = st_allocate_request(STp);
- if (!SRpnt)
- return STp->buffer->syscall_result;
-
max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
for (attentions=waits=0; ; ) {
memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
cmd[0] = TEST_UNIT_READY;
+ SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE,
+ STp->long_timeout, MAX_READY_RETRIES, 1);
- retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
- STp->long_timeout,
- MAX_READY_RETRIES);
- if (retval)
+ if (!SRpnt) {
+ retval = (STp->buffer)->syscall_result;
break;
+ }
if (cmdstatp->have_sense) {
break;
}
- st_release_request(SRpnt);
-
+ if (SRpnt != NULL)
+ st_release_request(SRpnt);
return retval;
}
}
}
- SRpnt = st_allocate_request(STp);
- if (!SRpnt) {
- retval = STp->buffer->syscall_result;
- goto err_out;
- }
-
if (STp->omit_blklims)
STp->min_block = STp->max_block = (-1);
else {
memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE);
cmd[0] = READ_BLOCK_LIMITS;
- retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
- STp->buffer->b_data, 6,
- STp->device->request_queue->rq_timeout,
- MAX_READY_RETRIES);
- if (retval) {
- st_release_request(SRpnt);
+ SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE,
+ STp->device->request_queue->rq_timeout,
+ MAX_READY_RETRIES, 1);
+ if (!SRpnt) {
+ retval = (STp->buffer)->syscall_result;
goto err_out;
}
cmd[0] = MODE_SENSE;
cmd[4] = 12;
- retval = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
- STp->buffer->b_data, 12,
- STp->device->request_queue->rq_timeout,
- MAX_READY_RETRIES);
- if (retval) {
- st_release_request(SRpnt);
+ SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE,
+ STp->device->request_queue->rq_timeout,
+ MAX_READY_RETRIES, 1);
+ if (!SRpnt) {
+ retval = (STp->buffer)->syscall_result;
goto err_out;
}
cmd[0] = WRITE_FILEMARKS;
cmd[4] = 1 + STp->two_fm;
- SRpnt = st_allocate_request(STp);
+ SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
+ STp->device->request_queue->rq_timeout,
+ MAX_WRITE_RETRIES, 1);
if (!SRpnt) {
- result = STp->buffer->syscall_result;
- goto out;
- }
-
- result = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0,
- STp->device->request_queue->rq_timeout,
- MAX_WRITE_RETRIES);
- if (result) {
- st_release_request(SRpnt);
+ result = (STp->buffer)->syscall_result;
goto out;
}
else
STbp->do_dio = 0; /* fall back to buffering with any error */
STbp->sg_segs = STbp->do_dio;
- STbp->frp_sg_current = 0;
DEB(
if (STbp->do_dio) {
STp->nbr_dio++;
} else if (code == MT_ST_SET_CLN) {
value = (options & ~MT_ST_OPTIONS) & 0xff;
if (value != 0 &&
- value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE)
+ (value < EXTENDED_SENSE_START ||
+ value >= SCSI_SENSE_BUFFERSIZE))
return (-EINVAL);
STp->cln_mode = value;
STp->cln_sense_mask = (options >> 8) & 0xff;
{
unsigned char cmd[MAX_COMMAND_SIZE];
struct st_request *SRpnt;
- int ret;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SENSE;
cmd[2] = page;
cmd[4] = 255;
- SRpnt = st_allocate_request(STp);
- if (!SRpnt)
- return STp->buffer->syscall_result;
+ SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE,
+ STp->device->request_queue->rq_timeout, 0, 1);
+ if (SRpnt == NULL)
+ return (STp->buffer)->syscall_result;
- ret = st_scsi_kern_execute(SRpnt, cmd, DMA_FROM_DEVICE,
- STp->buffer->b_data, cmd[4],
- STp->device->request_queue->rq_timeout,
- MAX_RETRIES);
st_release_request(SRpnt);
- return ret ? : STp->buffer->syscall_result;
+ return STp->buffer->syscall_result;
}
in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */
static int write_mode_page(struct scsi_tape *STp, int page, int slow)
{
- int pgo, timeout, ret = 0;
+ int pgo;
unsigned char cmd[MAX_COMMAND_SIZE];
struct st_request *SRpnt;
+ int timeout;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SELECT;
(STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP;
(STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR;
- SRpnt = st_allocate_request(STp);
- if (!SRpnt)
- return ret;
-
- timeout = slow ? STp->long_timeout :
- STp->device->request_queue->rq_timeout;
-
- ret = st_scsi_kern_execute(SRpnt, cmd, DMA_TO_DEVICE,
- STp->buffer->b_data, cmd[4], timeout, 0);
- if (!ret)
- ret = STp->buffer->syscall_result;
+ timeout = slow ?
+ STp->long_timeout : STp->device->request_queue->rq_timeout;
+ SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE,
+ timeout, 0, 1);
+ if (SRpnt == NULL)
+ return (STp->buffer)->syscall_result;
st_release_request(SRpnt);
- return ret;
+ return STp->buffer->syscall_result;
}
printk(ST_DEB_MSG "%s: Loading tape.\n", name);
);
- SRpnt = st_allocate_request(STp);
+ SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE,
+ timeout, MAX_RETRIES, 1);
if (!SRpnt)
- return STp->buffer->syscall_result;
-
- retval = st_scsi_kern_execute(SRpnt, cmd, DMA_NONE, NULL, 0, timeout,
- MAX_RETRIES);
- if (retval)
- goto out;
+ return (STp->buffer)->syscall_result;
retval = (STp->buffer)->syscall_result;
+ st_release_request(SRpnt);
if (!retval) { /* SCSI command successful */
STps = &(STp->ps[STp->partition]);
STps->drv_file = STps->drv_block = (-1);
}
-out:
- st_release_request(SRpnt);
return retval;
}
return (-ENOSYS);
}
- SRpnt = st_allocate_request(STp);
+ SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction,
+ timeout, MAX_RETRIES, 1);
if (!SRpnt)
return (STp->buffer)->syscall_result;
- ioctl_result = st_scsi_kern_execute(SRpnt, cmd, direction,
- STp->buffer->b_data, datalen,
- timeout, MAX_RETRIES);
- if (!ioctl_result)
- ioctl_result = (STp->buffer)->syscall_result;
+ ioctl_result = (STp->buffer)->syscall_result;
if (!ioctl_result) { /* SCSI command successful */
st_release_request(SRpnt);
ioctl_result = st_int_ioctl(STp, MTBSF, 1);
if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) {
- int old_block_size = STp->block_size;
STp->block_size = arg & MT_ST_BLKSIZE_MASK;
if (STp->block_size != 0) {
- if (old_block_size == 0)
- normalize_buffer(STp->buffer);
(STp->buffer)->buffer_blocks =
(STp->buffer)->buffer_size / STp->block_size;
}
!(STp->use_pf & PF_TESTED)) {
/* Try the other possible state of Page Format if not
already tried */
- STp->use_pf = !STp->use_pf | PF_TESTED;
+ STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED;
st_release_request(SRpnt);
SRpnt = NULL;
return st_int_ioctl(STp, cmd_in, arg);
if (!logical && !STp->scsi2_logical)
scmd[1] = 1;
}
-
- SRpnt = st_allocate_request(STp);
+ SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE,
+ STp->device->request_queue->rq_timeout,
+ MAX_READY_RETRIES, 1);
if (!SRpnt)
- return STp->buffer->syscall_result;
-
- result = st_scsi_kern_execute(SRpnt, scmd, DMA_FROM_DEVICE,
- STp->buffer->b_data, 20,
- STp->device->request_queue->rq_timeout,
- MAX_READY_RETRIES);
- if (result)
- goto out;
+ return (STp->buffer)->syscall_result;
if ((STp->buffer)->syscall_result != 0 ||
(STp->device->scsi_level >= SCSI_2 &&
DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
*block, *partition));
}
-out:
st_release_request(SRpnt);
SRpnt = NULL;
timeout = STp->device->request_queue->rq_timeout;
}
- SRpnt = st_allocate_request(STp);
+ SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE,
+ timeout, MAX_READY_RETRIES, 1);
if (!SRpnt)
- return STp->buffer->syscall_result;
-
- result = st_scsi_kern_execute(SRpnt, scmd, DMA_NONE, NULL, 0,
- timeout, MAX_READY_RETRIES);
- if (result)
- goto out;
+ return (STp->buffer)->syscall_result;
STps->drv_block = STps->drv_file = (-1);
STps->eof = ST_NOEOF;
STps->drv_block = STps->drv_file = 0;
result = 0;
}
-out:
+
st_release_request(SRpnt);
SRpnt = NULL;
/* Try to allocate a new tape buffer. Calling function must not hold
dev_arr_lock. */
-static struct st_buffer *
- new_tape_buffer(int from_initialization, int need_dma, int max_sg)
+static struct st_buffer *new_tape_buffer(int need_dma, int max_sg)
{
- int got = 0;
- gfp_t priority;
struct st_buffer *tb;
- if (from_initialization)
- priority = GFP_ATOMIC;
- else
- priority = GFP_KERNEL;
-
- tb = kzalloc(sizeof(struct st_buffer), priority);
+ tb = kzalloc(sizeof(struct st_buffer), GFP_ATOMIC);
if (!tb) {
printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n");
return NULL;
}
- tb->frp_segs = tb->orig_frp_segs = 0;
+ tb->frp_segs = 0;
tb->use_sg = max_sg;
-
tb->dma = need_dma;
- tb->buffer_size = got;
+ tb->buffer_size = 0;
- tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), priority);
+ tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *),
+ GFP_ATOMIC);
if (!tb->reserved_pages) {
kfree(tb);
return NULL;
/* Try to allocate enough space in the tape buffer */
+#define ST_MAX_ORDER 6
+
static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma)
{
int segs, nbr, max_segs, b_size, order, got;
priority |= __GFP_ZERO;
if (STbuffer->frp_segs) {
- order = STbuffer->map_data.page_order;
+ order = STbuffer->reserved_page_order;
b_size = PAGE_SIZE << order;
} else {
for (b_size = PAGE_SIZE, order = 0;
- order <= 6 && b_size < new_size; order++, b_size *= 2)
+ order < ST_MAX_ORDER && b_size < new_size;
+ order++, b_size *= 2)
; /* empty */
}
+ if (max_segs * (PAGE_SIZE << order) < new_size) {
+ if (order == ST_MAX_ORDER)
+ return 0;
+ normalize_buffer(STbuffer);
+ return enlarge_buffer(STbuffer, new_size, need_dma);
+ }
for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size;
segs < max_segs && got < new_size;) {
segs++;
}
STbuffer->b_data = page_address(STbuffer->reserved_pages[0]);
- STbuffer->map_data.page_order = order;
+ STbuffer->reserved_page_order = order;
return 1;
}
for (i=0; i < st_bp->frp_segs; i++)
memset(page_address(st_bp->reserved_pages[i]), 0,
- PAGE_SIZE << st_bp->map_data.page_order);
+ PAGE_SIZE << st_bp->reserved_page_order);
st_bp->cleared = 1;
}
/* Release the extra buffer */
static void normalize_buffer(struct st_buffer * STbuffer)
{
- int i, order = STbuffer->map_data.page_order;
+ int i, order = STbuffer->reserved_page_order;
- for (i = STbuffer->orig_frp_segs; i < STbuffer->frp_segs; i++) {
+ for (i = 0; i < STbuffer->frp_segs; i++) {
__free_pages(STbuffer->reserved_pages[i], order);
STbuffer->buffer_size -= (PAGE_SIZE << order);
}
- STbuffer->frp_segs = STbuffer->orig_frp_segs;
- STbuffer->frp_sg_current = 0;
+ STbuffer->frp_segs = 0;
STbuffer->sg_segs = 0;
- STbuffer->map_data.page_order = 0;
+ STbuffer->reserved_page_order = 0;
STbuffer->map_data.offset = 0;
}
static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count)
{
int i, cnt, res, offset;
- int length = PAGE_SIZE << st_bp->map_data.page_order;
+ int length = PAGE_SIZE << st_bp->reserved_page_order;
for (i = 0, offset = st_bp->buffer_bytes;
i < st_bp->frp_segs && offset >= length; i++)
static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count)
{
int i, cnt, res, offset;
- int length = PAGE_SIZE << st_bp->map_data.page_order;
+ int length = PAGE_SIZE << st_bp->reserved_page_order;
for (i = 0, offset = st_bp->read_pointer;
i < st_bp->frp_segs && offset >= length; i++)
{
int src_seg, dst_seg, src_offset = 0, dst_offset;
int count, total;
- int length = PAGE_SIZE << st_bp->map_data.page_order;
+ int length = PAGE_SIZE << st_bp->reserved_page_order;
if (offset == 0)
return;
.open = st_open,
.flush = st_flush,
.release = st_release,
+ .llseek = noop_llseek,
};
static int st_probe(struct device *dev)
return -ENODEV;
}
- i = min(SDp->request_queue->max_hw_segments,
- SDp->request_queue->max_phys_segments);
+ i = queue_max_segments(SDp->request_queue);
if (st_max_sg_segs < i)
i = st_max_sg_segs;
- buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i);
+ buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i);
if (buffer == NULL) {
printk(KERN_ERR
"st: Can't allocate new tape buffer. Device not attached.\n");
tpnt->device = NULL;
if (tpnt->buffer) {
- tpnt->buffer->orig_frp_segs = 0;
normalize_buffer(tpnt->buffer);
kfree(tpnt->buffer->reserved_pages);
kfree(tpnt->buffer);
}
mdata->offset = uaddr & ~PAGE_MASK;
- mdata->page_order = 0;
STbp->mapped_pages = pages;
return nr_pages;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff