[SCSI] convert st to use scsi_execute_async
convert st to always send scatterlists and kill scsi_request
usage.
This is the same as last time as it was posted, but with Kai's patches
merged and we now pass the bytes value to scsi_execute_async.
TODO:
- move DIO code to common place or make block layers usable for ULDs.
- move buffer allocation code to common place for all ULDs to use. And
make buffer allocation code handle all queue limits so we can find
out about problems before calling scsi_execute_async.
- move indirect (copy_to/from_user) paths commone place or make block
layers usable for ULDs.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 053444b..26e13dc 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -50,7 +50,6 @@
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
-#include <scsi/scsi_request.h>
#include <scsi/sg.h>
@@ -188,8 +187,6 @@
static void move_buffer_data(struct st_buffer *, int);
static void buf_to_sg(struct st_buffer *, unsigned int);
-static int st_map_user_pages(struct scatterlist *, const unsigned int,
- unsigned long, size_t, int, unsigned long);
static int sgl_map_user_pages(struct scatterlist *, const unsigned int,
unsigned long, size_t, int);
static int sgl_unmap_user_pages(struct scatterlist *, const unsigned int, int);
@@ -313,12 +310,13 @@
}
-static void st_analyze_sense(struct scsi_request *SRpnt, struct st_cmdstatus *s)
+static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s)
{
const u8 *ucp;
- const u8 *sense = SRpnt->sr_sense_buffer;
+ const u8 *sense = SRpnt->sense;
- s->have_sense = scsi_request_normalize_sense(SRpnt, &s->sense_hdr);
+ s->have_sense = scsi_normalize_sense(SRpnt->sense,
+ SCSI_SENSE_BUFFERSIZE, &s->sense_hdr);
s->flags = 0;
if (s->have_sense) {
@@ -345,9 +343,9 @@
/* Convert the result to success code */
-static int st_chk_result(struct scsi_tape *STp, struct scsi_request * SRpnt)
+static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt)
{
- int result = SRpnt->sr_result;
+ int result = SRpnt->result;
u8 scode;
DEB(const char *stp;)
char *name = tape_name(STp);
@@ -366,13 +364,12 @@
DEB(
if (debugging) {
- printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n",
+ printk(ST_DEB_MSG "%s: Error: %x, cmd: %x %x %x %x %x %x\n",
name, result,
- SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1], SRpnt->sr_cmnd[2],
- SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4], SRpnt->sr_cmnd[5],
- SRpnt->sr_bufflen);
+ SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2],
+ SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]);
if (cmdstatp->have_sense)
- scsi_print_req_sense("st", SRpnt);
+ __scsi_print_sense("st", SRpnt->sense, SCSI_SENSE_BUFFERSIZE);
} ) /* end DEB */
if (!debugging) { /* Abnormal conditions for tape */
if (!cmdstatp->have_sense)
@@ -386,20 +383,21 @@
/* scode != UNIT_ATTENTION && */
scode != BLANK_CHECK &&
scode != VOLUME_OVERFLOW &&
- SRpnt->sr_cmnd[0] != MODE_SENSE &&
- SRpnt->sr_cmnd[0] != TEST_UNIT_READY) {
+ SRpnt->cmd[0] != MODE_SENSE &&
+ SRpnt->cmd[0] != TEST_UNIT_READY) {
printk(KERN_WARNING "%s: Error with sense data: ", name);
- scsi_print_req_sense("st", SRpnt);
+ __scsi_print_sense("st", SRpnt->sense,
+ SCSI_SENSE_BUFFERSIZE);
}
}
if (cmdstatp->fixed_format &&
STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */
if (STp->cln_sense_value)
- STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] &
+ STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
STp->cln_sense_mask) == STp->cln_sense_value);
else
- STp->cleaning_req |= ((SRpnt->sr_sense_buffer[STp->cln_mode] &
+ STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] &
STp->cln_sense_mask) != 0);
}
if (cmdstatp->have_sense &&
@@ -411,8 +409,8 @@
if (cmdstatp->have_sense &&
scode == RECOVERED_ERROR
#if ST_RECOVERED_WRITE_FATAL
- && SRpnt->sr_cmnd[0] != WRITE_6
- && SRpnt->sr_cmnd[0] != WRITE_FILEMARKS
+ && SRpnt->cmd[0] != WRITE_6
+ && SRpnt->cmd[0] != WRITE_FILEMARKS
#endif
) {
STp->recover_count++;
@@ -420,9 +418,9 @@
DEB(
if (debugging) {
- if (SRpnt->sr_cmnd[0] == READ_6)
+ if (SRpnt->cmd[0] == READ_6)
stp = "read";
- else if (SRpnt->sr_cmnd[0] == WRITE_6)
+ else if (SRpnt->cmd[0] == WRITE_6)
stp = "write";
else
stp = "ioctl";
@@ -438,28 +436,37 @@
/* Wakeup from interrupt */
-static void st_sleep_done(struct scsi_cmnd * SCpnt)
+static void st_sleep_done(void *data, char *sense, int result, int resid)
{
- struct scsi_tape *STp = container_of(SCpnt->request->rq_disk->private_data,
- struct scsi_tape, driver);
+ struct st_request *SRpnt = data;
+ struct scsi_tape *STp = SRpnt->stp;
- (STp->buffer)->cmdstat.midlevel_result = SCpnt->result;
- SCpnt->request->rq_status = RQ_SCSI_DONE;
+ memcpy(SRpnt->sense, sense, SCSI_SENSE_BUFFERSIZE);
+ (STp->buffer)->cmdstat.midlevel_result = SRpnt->result = result;
DEB( STp->write_pending = 0; )
- if (SCpnt->request->waiting)
- complete(SCpnt->request->waiting);
+ if (SRpnt->waiting)
+ complete(SRpnt->waiting);
+}
+
+static struct st_request *st_allocate_request(void)
+{
+ return kzalloc(sizeof(struct st_request), GFP_KERNEL);
+}
+
+static void st_release_request(struct st_request *streq)
+{
+ kfree(streq);
}
/* Do the scsi command. Waits until command performed if do_wait is true.
Otherwise write_behind_check() is used to check that the command
has finished. */
-static struct scsi_request *
-st_do_scsi(struct scsi_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
+static struct st_request *
+st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd,
int bytes, int direction, int timeout, int retries, int do_wait)
{
struct completion *waiting;
- unsigned char *bp;
/* if async, make sure there's no command outstanding */
if (!do_wait && ((STp->buffer)->last_SRpnt)) {
@@ -473,7 +480,7 @@
}
if (SRpnt == NULL) {
- SRpnt = scsi_allocate_request(STp->device, GFP_ATOMIC);
+ SRpnt = st_allocate_request();
if (SRpnt == NULL) {
DEBC( printk(KERN_ERR "%s: Can't get SCSI request.\n",
tape_name(STp)); );
@@ -483,6 +490,7 @@
(STp->buffer)->syscall_result = (-EBUSY);
return NULL;
}
+ SRpnt->stp = STp;
}
/* If async IO, set last_SRpnt. This ptr tells write_behind_check
@@ -492,32 +500,26 @@
waiting = &STp->wait;
init_completion(waiting);
- SRpnt->sr_use_sg = STp->buffer->do_dio || (bytes > (STp->buffer)->frp[0].length);
- if (SRpnt->sr_use_sg) {
- if (!STp->buffer->do_dio)
- buf_to_sg(STp->buffer, bytes);
- SRpnt->sr_use_sg = (STp->buffer)->sg_segs;
- bp = (char *) &((STp->buffer)->sg[0]);
- } else
- bp = (STp->buffer)->b_data;
- SRpnt->sr_data_direction = direction;
- SRpnt->sr_cmd_len = 0;
- SRpnt->sr_request->waiting = waiting;
- SRpnt->sr_request->rq_status = RQ_SCSI_BUSY;
- SRpnt->sr_request->rq_disk = STp->disk;
- SRpnt->sr_request->end_io = blk_end_sync_rq;
+ SRpnt->waiting = waiting;
+
+ if (!STp->buffer->do_dio)
+ buf_to_sg(STp->buffer, bytes);
+
+ memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd));
STp->buffer->cmdstat.have_sense = 0;
+ STp->buffer->syscall_result = 0;
- scsi_do_req(SRpnt, (void *) cmd, bp, bytes,
- st_sleep_done, timeout, retries);
-
- if (do_wait) {
+ if (scsi_execute_async(STp->device, cmd, direction,
+ &((STp->buffer)->sg[0]), bytes, (STp->buffer)->sg_segs,
+ timeout, retries, SRpnt, st_sleep_done, GFP_KERNEL))
+ /* could not allocate the buffer or request was too large */
+ (STp->buffer)->syscall_result = (-EBUSY);
+ else if (do_wait) {
wait_for_completion(waiting);
- SRpnt->sr_request->waiting = NULL;
- if (SRpnt->sr_request->rq_status != RQ_SCSI_DONE)
- SRpnt->sr_result |= (DRIVER_ERROR << 24);
+ SRpnt->waiting = NULL;
(STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
}
+
return SRpnt;
}
@@ -532,7 +534,7 @@
struct st_buffer *STbuffer;
struct st_partstat *STps;
struct st_cmdstatus *cmdstatp;
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
STbuffer = STp->buffer;
if (!STbuffer->writing)
@@ -548,12 +550,10 @@
wait_for_completion(&(STp->wait));
SRpnt = STbuffer->last_SRpnt;
STbuffer->last_SRpnt = NULL;
- SRpnt->sr_request->waiting = NULL;
- if (SRpnt->sr_request->rq_status != RQ_SCSI_DONE)
- SRpnt->sr_result |= (DRIVER_ERROR << 24);
+ SRpnt->waiting = NULL;
(STp->buffer)->syscall_result = st_chk_result(STp, SRpnt);
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
STbuffer->buffer_bytes -= STbuffer->writing;
STps = &(STp->ps[STp->partition]);
@@ -593,7 +593,7 @@
it messes up the block number). */
static int cross_eof(struct scsi_tape * STp, int forward)
{
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
unsigned char cmd[MAX_COMMAND_SIZE];
cmd[0] = SPACE;
@@ -613,7 +613,7 @@
if (!SRpnt)
return (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
if ((STp->buffer)->cmdstat.midlevel_result != 0)
@@ -630,7 +630,7 @@
int offset, transfer, blks;
int result;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct st_partstat *STps;
result = write_behind_check(STp);
@@ -688,7 +688,7 @@
STp->dirty = 0;
(STp->buffer)->buffer_bytes = 0;
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
}
return result;
@@ -785,7 +785,7 @@
}
-/* Lock or unlock the drive door. Don't use when scsi_request allocated. */
+/* Lock or unlock the drive door. Don't use when st_request allocated. */
static int do_door_lock(struct scsi_tape * STp, int do_lock)
{
int retval, cmd;
@@ -844,7 +844,7 @@
int attentions, waits, max_wait, scode;
int retval = CHKRES_READY, new_session = 0;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat;
max_wait = do_wait ? ST_BLOCK_SECONDS : 0;
@@ -903,7 +903,7 @@
}
if (SRpnt != NULL)
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
return retval;
}
@@ -918,7 +918,7 @@
int i, retval, new_session = 0, do_wait;
unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning;
unsigned short st_flags = filp->f_flags;
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct st_modedef *STm;
struct st_partstat *STps;
char *name = tape_name(STp);
@@ -993,7 +993,7 @@
goto err_out;
}
- if (!SRpnt->sr_result && !STp->buffer->cmdstat.have_sense) {
+ if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) {
STp->max_block = ((STp->buffer)->b_data[1] << 16) |
((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3];
STp->min_block = ((STp->buffer)->b_data[4] << 8) |
@@ -1045,7 +1045,7 @@
}
STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0;
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
STp->inited = 1;
@@ -1196,7 +1196,7 @@
{
int result = 0, result2;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct scsi_tape *STp = filp->private_data;
struct st_modedef *STm = &(STp->modes[STp->current_mode]);
struct st_partstat *STps = &(STp->ps[STp->partition]);
@@ -1249,7 +1249,7 @@
cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) &&
(!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) {
/* Write successful at EOM */
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
if (STps->drv_file >= 0)
STps->drv_file++;
@@ -1259,7 +1259,7 @@
STps->eof = ST_FM;
}
else { /* Write error */
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
printk(KERN_ERR "%s: Error on write filemark.\n", name);
if (result == 0)
@@ -1400,11 +1400,11 @@
i = STp->try_dio && try_rdio;
else
i = STp->try_dio && try_wdio;
+
if (i && ((unsigned long)buf & queue_dma_alignment(
STp->device->request_queue)) == 0) {
- i = st_map_user_pages(&(STbp->sg[0]), STbp->use_sg,
- (unsigned long)buf, count, (is_read ? READ : WRITE),
- STp->max_pfn);
+ i = sgl_map_user_pages(&(STbp->sg[0]), STbp->use_sg,
+ (unsigned long)buf, count, (is_read ? READ : WRITE));
if (i > 0) {
STbp->do_dio = i;
STbp->buffer_bytes = 0; /* can be used as transfer counter */
@@ -1472,7 +1472,7 @@
int async_write;
unsigned char cmd[MAX_COMMAND_SIZE];
const char __user *b_point;
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct scsi_tape *STp = filp->private_data;
struct st_modedef *STm;
struct st_partstat *STps;
@@ -1624,7 +1624,7 @@
retval = STbp->syscall_result;
goto out;
}
- if (async_write) {
+ if (async_write && !STbp->syscall_result) {
STbp->writing = transfer;
STp->dirty = !(STbp->writing ==
STbp->buffer_bytes);
@@ -1698,7 +1698,7 @@
} else {
count += do_count;
STps->drv_block = (-1); /* Too cautious? */
- retval = (-EIO);
+ retval = STbp->syscall_result;
}
}
@@ -1728,7 +1728,7 @@
out:
if (SRpnt != NULL)
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
release_buffering(STp);
up(&STp->lock);
@@ -1742,11 +1742,11 @@
Does release user buffer mapping if it is set.
*/
static long read_tape(struct scsi_tape *STp, long count,
- struct scsi_request ** aSRpnt)
+ struct st_request ** aSRpnt)
{
int transfer, blks, bytes;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct st_modedef *STm;
struct st_partstat *STps;
struct st_buffer *STbp;
@@ -1802,10 +1802,10 @@
retval = 1;
DEBC(printk(ST_DEB_MSG "%s: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
name,
- SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[1],
- SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[3],
- SRpnt->sr_sense_buffer[4], SRpnt->sr_sense_buffer[5],
- SRpnt->sr_sense_buffer[6], SRpnt->sr_sense_buffer[7]));
+ SRpnt->sense[0], SRpnt->sense[1],
+ SRpnt->sense[2], SRpnt->sense[3],
+ SRpnt->sense[4], SRpnt->sense[5],
+ SRpnt->sense[6], SRpnt->sense[7]));
if (cmdstatp->have_sense) {
if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
@@ -1835,7 +1835,7 @@
}
STbp->buffer_bytes = bytes - transfer;
} else {
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = *aSRpnt = NULL;
if (transfer == blks) { /* We did not get anything, error */
printk(KERN_NOTICE "%s: Incorrect block size.\n", name);
@@ -1929,7 +1929,7 @@
ssize_t retval = 0;
ssize_t i, transfer;
int special, do_dio = 0;
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
struct scsi_tape *STp = filp->private_data;
struct st_modedef *STm;
struct st_partstat *STps;
@@ -2054,7 +2054,7 @@
out:
if (SRpnt != NULL) {
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
}
if (do_dio) {
@@ -2284,7 +2284,7 @@
static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs)
{
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SENSE;
@@ -2298,7 +2298,7 @@
if (SRpnt == NULL)
return (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
return (STp->buffer)->syscall_result;
}
@@ -2310,7 +2310,7 @@
{
int pgo;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt = NULL;
+ struct st_request *SRpnt = NULL;
memset(cmd, 0, MAX_COMMAND_SIZE);
cmd[0] = MODE_SELECT;
@@ -2329,7 +2329,7 @@
if (SRpnt == NULL)
return (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
return (STp->buffer)->syscall_result;
}
@@ -2412,7 +2412,7 @@
DEB( char *name = tape_name(STp); )
unsigned char cmd[MAX_COMMAND_SIZE];
struct st_partstat *STps;
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
if (STp->ready != ST_READY && !load_code) {
if (STp->ready == ST_NO_TAPE)
@@ -2455,7 +2455,7 @@
return (STp->buffer)->syscall_result;
retval = (STp->buffer)->syscall_result;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
if (!retval) { /* SCSI command successful */
@@ -2503,7 +2503,7 @@
int ioctl_result;
int chg_eof = 1;
unsigned char cmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
struct st_partstat *STps;
int fileno, blkno, at_sm, undone;
int datalen = 0, direction = DMA_NONE;
@@ -2757,7 +2757,7 @@
ioctl_result = (STp->buffer)->syscall_result;
if (!ioctl_result) { /* SCSI command successful */
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
STps->drv_block = blkno;
STps->drv_file = fileno;
@@ -2872,7 +2872,7 @@
/* Try the other possible state of Page Format if not
already tried */
STp->use_pf = !STp->use_pf | PF_TESTED;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
return st_int_ioctl(STp, cmd_in, arg);
}
@@ -2882,7 +2882,7 @@
if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK)
STps->eof = ST_EOD;
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
}
@@ -2898,7 +2898,7 @@
{
int result;
unsigned char scmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
DEB( char *name = tape_name(STp); )
if (STp->ready != ST_READY)
@@ -2944,7 +2944,7 @@
DEBC(printk(ST_DEB_MSG "%s: Got tape pos. blk %d part %d.\n", name,
*block, *partition));
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
return result;
@@ -2961,7 +2961,7 @@
unsigned int blk;
int timeout;
unsigned char scmd[MAX_COMMAND_SIZE];
- struct scsi_request *SRpnt;
+ struct st_request *SRpnt;
DEB( char *name = tape_name(STp); )
if (STp->ready != ST_READY)
@@ -3047,7 +3047,7 @@
result = 0;
}
- scsi_release_request(SRpnt);
+ st_release_request(SRpnt);
SRpnt = NULL;
return result;
@@ -3577,7 +3577,7 @@
static struct st_buffer *
new_tape_buffer(int from_initialization, int need_dma, int max_sg)
{
- int i, got = 0, segs = 0;
+ int i, got = 0;
gfp_t priority;
struct st_buffer *tb;
@@ -3594,10 +3594,8 @@
return NULL;
}
memset(tb, 0, i);
- tb->frp_segs = tb->orig_frp_segs = segs;
+ tb->frp_segs = tb->orig_frp_segs = 0;
tb->use_sg = max_sg;
- if (segs > 0)
- tb->b_data = page_address(tb->sg[0].page);
tb->frp = (struct st_buf_fragment *)(&(tb->sg[0]) + max_sg);
tb->in_use = 1;
@@ -3628,7 +3626,7 @@
priority = GFP_KERNEL | __GFP_NOWARN;
if (need_dma)
priority |= GFP_DMA;
- for (b_size = PAGE_SIZE, order=0;
+ for (b_size = PAGE_SIZE, order=0; order <= 6 &&
b_size < new_size - STbuffer->buffer_size;
order++, b_size *= 2)
; /* empty */
@@ -3670,6 +3668,7 @@
}
STbuffer->frp_segs = STbuffer->orig_frp_segs;
STbuffer->frp_sg_current = 0;
+ STbuffer->sg_segs = 0;
}
@@ -3882,7 +3881,6 @@
struct st_buffer *buffer;
int i, j, mode, dev_num, error;
char *stp;
- u64 bounce_limit;
if (SDp->type != TYPE_TAPE)
return -ENODEV;
@@ -3892,7 +3890,8 @@
return -ENODEV;
}
- i = SDp->host->sg_tablesize;
+ i = min(SDp->request_queue->max_hw_segments,
+ SDp->request_queue->max_phys_segments);
if (st_max_sg_segs < i)
i = st_max_sg_segs;
buffer = new_tape_buffer(1, (SDp->host)->unchecked_isa_dma, i);
@@ -3994,11 +3993,6 @@
tpnt->long_timeout = ST_LONG_TIMEOUT;
tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma;
- bounce_limit = scsi_calculate_bounce_limit(SDp->host) >> PAGE_SHIFT;
- if (bounce_limit > ULONG_MAX)
- bounce_limit = ULONG_MAX;
- tpnt->max_pfn = bounce_limit;
-
for (i = 0; i < ST_NBR_MODES; i++) {
STm = &(tpnt->modes[i]);
STm->defined = 0;
@@ -4077,9 +4071,9 @@
sdev_printk(KERN_WARNING, SDp,
"Attached scsi tape %s", tape_name(tpnt));
- printk(KERN_WARNING "%s: try direct i/o: %s (alignment %d B), max page reachable by HBA %lu\n",
+ printk(KERN_WARNING "%s: try direct i/o: %s (alignment %d B)\n",
tape_name(tpnt), tpnt->try_dio ? "yes" : "no",
- queue_dma_alignment(SDp->request_queue) + 1, tpnt->max_pfn);
+ queue_dma_alignment(SDp->request_queue) + 1);
return 0;
@@ -4411,34 +4405,6 @@
return;
}
-
-/* Pin down user pages and put them into a scatter gather list. Returns <= 0 if
- - mapping of all pages not successful
- - any page is above max_pfn
- (i.e., either completely successful or fails)
-*/
-static int st_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
- unsigned long uaddr, size_t count, int rw,
- unsigned long max_pfn)
-{
- int i, nr_pages;
-
- nr_pages = sgl_map_user_pages(sgl, max_pages, uaddr, count, rw);
- if (nr_pages <= 0)
- return nr_pages;
-
- for (i=0; i < nr_pages; i++) {
- if (page_to_pfn(sgl[i].page) > max_pfn)
- goto out_unmap;
- }
- return nr_pages;
-
- out_unmap:
- sgl_unmap_user_pages(sgl, nr_pages, 0);
- return 0;
-}
-
-
/* The following functions may be useful for a larger audience. */
static int sgl_map_user_pages(struct scatterlist *sgl, const unsigned int max_pages,
unsigned long uaddr, size_t count, int rw)
diff --git a/drivers/scsi/st.h b/drivers/scsi/st.h
index 790acac..4112090 100644
--- a/drivers/scsi/st.h
+++ b/drivers/scsi/st.h
@@ -4,6 +4,7 @@
#include <linux/completion.h>
#include <linux/kref.h>
+#include <scsi/scsi_cmnd.h>
/* Descriptor for analyzed sense data */
struct st_cmdstatus {
@@ -17,6 +18,17 @@
u8 deferred;
};
+struct scsi_tape;
+
+/* scsi tape command */
+struct st_request {
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ int result;
+ struct scsi_tape *stp;
+ struct completion *waiting;
+};
+
/* The tape buffer descriptor. */
struct st_buffer {
unsigned char in_use;
@@ -28,7 +40,7 @@
int read_pointer;
int writing;
int syscall_result;
- struct scsi_request *last_SRpnt;
+ struct st_request *last_SRpnt;
struct st_cmdstatus cmdstat;
unsigned char *b_data;
unsigned short use_sg; /* zero or max number of s/g segments for this adapter */