summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--block/scsi_ioctl.c101
-rw-r--r--drivers/scsi/scsi_ioctl.c176
-rw-r--r--drivers/scsi/sg.c2
-rw-r--r--include/linux/blkdev.h4
-rw-r--r--include/scsi/scsi_ioctl.h2
5 files changed, 78 insertions, 207 deletions
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 24f7af9d0abc..b33eda26e205 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -350,16 +350,51 @@ out:
return ret;
}
+/**
+ * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
+ * @file: file this ioctl operates on (optional)
+ * @q: request queue to send scsi commands down
+ * @disk: gendisk to operate on (option)
+ * @sic: userspace structure describing the command to perform
+ *
+ * Send down the scsi command described by @sic to the device below
+ * the request queue @q. If @file is non-NULL it's used to perform
+ * fine-grained permission checks that allow users to send down
+ * non-destructive SCSI commands. If the caller has a struct gendisk
+ * available it should be passed in as @disk to allow the low level
+ * driver to use the information contained in it. A non-NULL @disk
+ * is only allowed if the caller knows that the low level driver doesn't
+ * need it (e.g. in the scsi subsystem).
+ *
+ * Notes:
+ * - This interface is deprecated - users should use the SG_IO
+ * interface instead, as this is a more flexible approach to
+ * performing SCSI commands on a device.
+ * - The SCSI command length is determined by examining the 1st byte
+ * of the given command. There is no way to override this.
+ * - Data transfers are limited to PAGE_SIZE
+ * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
+ * accommodate the sense buffer when an error occurs.
+ * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
+ * old code will not be surprised.
+ * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
+ * a negative return and the Unix error code in 'errno'.
+ * If the SCSI command succeeds then 0 is returned.
+ * Positive numbers returned are the compacted SCSI error codes (4
+ * bytes in one int) where the lowest byte is the SCSI status.
+ */
#define OMAX_SB_LEN 16 /* For backward compatibility */
-
-static int sg_scsi_ioctl(struct file *file, request_queue_t *q,
- struct gendisk *bd_disk, Scsi_Ioctl_Command __user *sic)
+int sg_scsi_ioctl(struct file *file, struct request_queue *q,
+ struct gendisk *disk, struct scsi_ioctl_command __user *sic)
{
struct request *rq;
int err;
unsigned int in_len, out_len, bytes, opcode, cmdlen;
char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
+ if (!sic)
+ return -EINVAL;
+
/*
* get in an out lengths, verify they don't exceed a page worth of data
*/
@@ -393,45 +428,53 @@ static int sg_scsi_ioctl(struct file *file, request_queue_t *q,
if (copy_from_user(rq->cmd, sic->data, cmdlen))
goto error;
- if (copy_from_user(buffer, sic->data + cmdlen, in_len))
+ if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
goto error;
err = verify_command(file, rq->cmd);
if (err)
goto error;
+ /* default. possible overriden later */
+ rq->retries = 5;
+
switch (opcode) {
- case SEND_DIAGNOSTIC:
- case FORMAT_UNIT:
- rq->timeout = FORMAT_UNIT_TIMEOUT;
- break;
- case START_STOP:
- rq->timeout = START_STOP_TIMEOUT;
- break;
- case MOVE_MEDIUM:
- rq->timeout = MOVE_MEDIUM_TIMEOUT;
- break;
- case READ_ELEMENT_STATUS:
- rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
- break;
- case READ_DEFECT_DATA:
- rq->timeout = READ_DEFECT_DATA_TIMEOUT;
- break;
- default:
- rq->timeout = BLK_DEFAULT_TIMEOUT;
- break;
+ case SEND_DIAGNOSTIC:
+ case FORMAT_UNIT:
+ rq->timeout = FORMAT_UNIT_TIMEOUT;
+ rq->retries = 1;
+ break;
+ case START_STOP:
+ rq->timeout = START_STOP_TIMEOUT;
+ break;
+ case MOVE_MEDIUM:
+ rq->timeout = MOVE_MEDIUM_TIMEOUT;
+ break;
+ case READ_ELEMENT_STATUS:
+ rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
+ break;
+ case READ_DEFECT_DATA:
+ rq->timeout = READ_DEFECT_DATA_TIMEOUT;
+ rq->retries = 1;
+ break;
+ default:
+ rq->timeout = BLK_DEFAULT_TIMEOUT;
+ break;
+ }
+
+ if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
+ err = DRIVER_ERROR << 24;
+ goto out;
}
memset(sense, 0, sizeof(sense));
rq->sense = sense;
rq->sense_len = 0;
-
- rq->data = buffer;
- rq->data_len = bytes;
rq->flags |= REQ_BLOCK_PC;
- rq->retries = 0;
- blk_execute_rq(q, bd_disk, rq, 0);
+ blk_execute_rq(q, disk, rq, 0);
+
+out:
err = rq->errors & 0xff; /* only 8 bit SCSI status */
if (err) {
if (rq->sense_len && rq->sense) {
@@ -450,7 +493,7 @@ error:
blk_put_request(rq);
return err;
}
-
+EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
/* Send basic block requests */
static int __blk_send_generic(request_queue_t *q, struct gendisk *bd_disk, int cmd, int data)
diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
index 36e930066649..a89aff61d3d8 100644
--- a/drivers/scsi/scsi_ioctl.c
+++ b/drivers/scsi/scsi_ioctl.c
@@ -158,180 +158,6 @@ int scsi_set_medium_removal(struct scsi_device *sdev, char state)
EXPORT_SYMBOL(scsi_set_medium_removal);
/*
- * This interface is deprecated - users should use the scsi generic (sg)
- * interface instead, as this is a more flexible approach to performing
- * generic SCSI commands on a device.
- *
- * The structure that we are passed should look like:
- *
- * struct sdata {
- * unsigned int inlen; [i] Length of data to be written to device
- * unsigned int outlen; [i] Length of data to be read from device
- * unsigned char cmd[x]; [i] SCSI command (6 <= x <= 12).
- * [o] Data read from device starts here.
- * [o] On error, sense buffer starts here.
- * unsigned char wdata[y]; [i] Data written to device starts here.
- * };
- * Notes:
- * - The SCSI command length is determined by examining the 1st byte
- * of the given command. There is no way to override this.
- * - Data transfers are limited to PAGE_SIZE (4K on i386, 8K on alpha).
- * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
- * accommodate the sense buffer when an error occurs.
- * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
- * old code will not be surprised.
- * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
- * a negative return and the Unix error code in 'errno'.
- * If the SCSI command succeeds then 0 is returned.
- * Positive numbers returned are the compacted SCSI error codes (4
- * bytes in one int) where the lowest byte is the SCSI status.
- * See the drivers/scsi/scsi.h file for more information on this.
- *
- */
-#define OMAX_SB_LEN 16 /* Old sense buffer length */
-
-int scsi_ioctl_send_command(struct scsi_device *sdev,
- struct scsi_ioctl_command __user *sic)
-{
- char *buf;
- unsigned char cmd[MAX_COMMAND_SIZE];
- unsigned char sense[SCSI_SENSE_BUFFERSIZE];
- char __user *cmd_in;
- unsigned char opcode;
- unsigned int inlen, outlen, cmdlen;
- unsigned int needed, buf_needed;
- int timeout, retries, result;
- int data_direction;
- gfp_t gfp_mask = GFP_KERNEL;
-
- if (!sic)
- return -EINVAL;
-
- if (sdev->host->unchecked_isa_dma)
- gfp_mask |= GFP_DMA;
-
- /*
- * Verify that we can read at least this much.
- */
- if (!access_ok(VERIFY_READ, sic, sizeof(Scsi_Ioctl_Command)))
- return -EFAULT;
-
- if(__get_user(inlen, &sic->inlen))
- return -EFAULT;
-
- if(__get_user(outlen, &sic->outlen))
- return -EFAULT;
-
- /*
- * We do not transfer more than MAX_BUF with this interface.
- * If the user needs to transfer more data than this, they
- * should use scsi_generics (sg) instead.
- */
- if (inlen > MAX_BUF)
- return -EINVAL;
- if (outlen > MAX_BUF)
- return -EINVAL;
-
- cmd_in = sic->data;
- if(get_user(opcode, cmd_in))
- return -EFAULT;
-
- needed = buf_needed = (inlen > outlen ? inlen : outlen);
- if (buf_needed) {
- buf_needed = (buf_needed + 511) & ~511;
- if (buf_needed > MAX_BUF)
- buf_needed = MAX_BUF;
- buf = kzalloc(buf_needed, gfp_mask);
- if (!buf)
- return -ENOMEM;
- if (inlen == 0) {
- data_direction = DMA_FROM_DEVICE;
- } else if (outlen == 0 ) {
- data_direction = DMA_TO_DEVICE;
- } else {
- /*
- * Can this ever happen?
- */
- data_direction = DMA_BIDIRECTIONAL;
- }
-
- } else {
- buf = NULL;
- data_direction = DMA_NONE;
- }
-
- /*
- * Obtain the command from the user's address space.
- */
- cmdlen = COMMAND_SIZE(opcode);
-
- result = -EFAULT;
-
- if (!access_ok(VERIFY_READ, cmd_in, cmdlen + inlen))
- goto error;
-
- if(__copy_from_user(cmd, cmd_in, cmdlen))
- goto error;
-
- /*
- * Obtain the data to be sent to the device (if any).
- */
-
- if(inlen && copy_from_user(buf, cmd_in + cmdlen, inlen))
- goto error;
-
- switch (opcode) {
- case SEND_DIAGNOSTIC:
- case FORMAT_UNIT:
- timeout = FORMAT_UNIT_TIMEOUT;
- retries = 1;
- break;
- case START_STOP:
- timeout = START_STOP_TIMEOUT;
- retries = NORMAL_RETRIES;
- break;
- case MOVE_MEDIUM:
- timeout = MOVE_MEDIUM_TIMEOUT;
- retries = NORMAL_RETRIES;
- break;
- case READ_ELEMENT_STATUS:
- timeout = READ_ELEMENT_STATUS_TIMEOUT;
- retries = NORMAL_RETRIES;
- break;
- case READ_DEFECT_DATA:
- timeout = READ_DEFECT_DATA_TIMEOUT;
- retries = 1;
- break;
- default:
- timeout = IOCTL_NORMAL_TIMEOUT;
- retries = NORMAL_RETRIES;
- break;
- }
-
- result = scsi_execute(sdev, cmd, data_direction, buf, needed,
- sense, timeout, retries, 0);
-
- /*
- * If there was an error condition, pass the info back to the user.
- */
- if (result) {
- int sb_len = sizeof(*sense);
-
- sb_len = (sb_len > OMAX_SB_LEN) ? OMAX_SB_LEN : sb_len;
- if (copy_to_user(cmd_in, sense, sb_len))
- result = -EFAULT;
- } else {
- if (outlen && copy_to_user(cmd_in, buf, outlen))
- result = -EFAULT;
- }
-
-error:
- kfree(buf);
- return result;
-}
-EXPORT_SYMBOL(scsi_ioctl_send_command);
-
-/*
* The scsi_ioctl_get_pci() function places into arg the value
* pci_dev::slot_name (8 characters) for the PCI device (if any).
* Returns: 0 on success
@@ -409,7 +235,7 @@ int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
case SCSI_IOCTL_SEND_COMMAND:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
- return scsi_ioctl_send_command(sdev, arg);
+ return sg_scsi_ioctl(NULL, sdev->request_queue, NULL, arg);
case SCSI_IOCTL_DOORLOCK:
return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
case SCSI_IOCTL_DOORUNLOCK:
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 7405d0df95db..fcf9243dfa7d 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1044,7 +1044,7 @@ sg_ioctl(struct inode *inode, struct file *filp,
if (!sg_allow_access(opcode, sdp->device->type))
return -EPERM;
}
- return scsi_ioctl_send_command(sdp->device, p);
+ return sg_scsi_ioctl(filp, sdp->device->request_queue, NULL, p);
case SG_SET_DEBUG:
result = get_user(val, ip);
if (result)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index d0cac8b58de7..59e1259b1c40 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -17,6 +17,8 @@
#include <asm/scatterlist.h>
+struct scsi_ioctl_command;
+
struct request_queue;
typedef struct request_queue request_queue_t;
struct elevator_queue;
@@ -611,6 +613,8 @@ extern void blk_plug_device(request_queue_t *);
extern int blk_remove_plug(request_queue_t *);
extern void blk_recount_segments(request_queue_t *, struct bio *);
extern int scsi_cmd_ioctl(struct file *, struct gendisk *, unsigned int, void __user *);
+extern int sg_scsi_ioctl(struct file *, struct request_queue *,
+ struct gendisk *, struct scsi_ioctl_command __user *);
extern void blk_start_queue(request_queue_t *q);
extern void blk_stop_queue(request_queue_t *q);
extern void blk_sync_queue(struct request_queue *q);
diff --git a/include/scsi/scsi_ioctl.h b/include/scsi/scsi_ioctl.h
index d4be4d92d586..edb9525386da 100644
--- a/include/scsi/scsi_ioctl.h
+++ b/include/scsi/scsi_ioctl.h
@@ -41,8 +41,6 @@ typedef struct scsi_fctargaddress {
} Scsi_FCTargAddress;
extern int scsi_ioctl(struct scsi_device *, int, void __user *);
-extern int scsi_ioctl_send_command(struct scsi_device *,
- struct scsi_ioctl_command __user *);
extern int scsi_nonblockable_ioctl(struct scsi_device *sdev, int cmd,
void __user *arg, struct file *filp);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-27 21:14:43 +0000