* Original driver (sg.c):
* Copyright (C) 1992 Lawrence Foard
* Version 2 and 3 extensions to driver:
- * Copyright (C) 1998 - 2002 Douglas Gilbert
+ * Copyright (C) 1998 - 2004 Douglas Gilbert
*
* Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support
*
* any later version.
*
*/
-#include <linux/config.h>
-static int sg_version_num = 30530; /* 2 digits for each component */
+
+static int sg_version_num = 30531; /* 2 digits for each component */
+#define SG_VERSION_STR "3.5.31"
+
/*
* D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes:
* - scsi logging is available via SCSI_LOG_TIMEOUT macros. First
* the kernel/module needs to be built with CONFIG_SCSI_LOGGING
* (otherwise the macros compile to empty statements).
- * Then before running the program to be debugged enter:
- * # echo "scsi log timeout 7" > /proc/scsi/scsi
- * This will send copious output to the console and the log which
- * is usually /var/log/messages. To turn off debugging enter:
- * # echo "scsi log timeout 0" > /proc/scsi/scsi
- * The 'timeout' token was chosen because it is relatively unused.
- * The token 'hlcomplete' should be used but that triggers too
- * much output from the sd device driver. To dump the current
- * state of the SCSI mid level data structures enter:
- * # echo "scsi dump 1" > /proc/scsi/scsi
- * To dump the state of sg's data structures use:
- * # cat /proc/scsi/sg/debug
*
*/
+#include <linux/config.h>
#include <linux/module.h>
#include <linux/fs.h>
#ifdef CONFIG_SCSI_PROC_FS
#include <linux/proc_fs.h>
-static char *sg_version_str = "3.5.30 [20040124]";
+static char *sg_version_date = "20040513";
static int sg_proc_init(void);
static void sg_proc_cleanup(void);
#define SG_SECTOR_SZ 512
#define SG_SECTOR_MSK (SG_SECTOR_SZ - 1)
-#define SG_DEV_ARR_LUMP 6 /* amount to over allocate sg_dev_arr by */
+#define SG_DEV_ARR_LUMP 32 /* amount to over allocate sg_dev_arr by */
static int sg_add(struct class_device *);
static void sg_remove(struct class_device *);
static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size);
static int sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp,
int tablesize);
-static ssize_t sg_new_read(Sg_fd * sfp, char *buf, size_t count,
+static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count,
Sg_request * srp);
-static ssize_t sg_new_write(Sg_fd * sfp, const char *buf, size_t count,
+static ssize_t sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
int blocking, int read_only, Sg_request ** o_srp);
static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
unsigned char *cmnd, int timeout, int blocking);
static int sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
- int wr_xf, int *countp, unsigned char **up);
+ int wr_xf, int *countp, unsigned char __user **up);
static int sg_write_xfer(Sg_request * srp);
static int sg_read_xfer(Sg_request * srp);
-static int sg_read_oxfer(Sg_request * srp, char *outp, int num_read_xfer);
+static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer);
static void sg_remove_scat(Sg_scatter_hold * schp);
static void sg_build_reserve(Sg_fd * sfp, int req_size);
static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size);
}
static ssize_t
-sg_read(struct file *filp, char *buf, size_t count, loff_t * ppos)
+sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos)
{
int k, res;
Sg_device *sdp;
}
static ssize_t
-sg_new_read(Sg_fd * sfp, char *buf, size_t count, Sg_request * srp)
+sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp)
{
sg_io_hdr_t *hp = &srp->header;
int err = 0;
}
static ssize_t
-sg_write(struct file *filp, const char *buf, size_t count, loff_t * ppos)
+sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos)
{
int mxsize, cmd_size, k;
int input_size, blocking;
else
hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE;
hp->dxfer_len = mxsize;
- hp->dxferp = (unsigned char *) buf + cmd_size;
+ hp->dxferp = (char __user *)buf + cmd_size;
hp->sbp = NULL;
hp->timeout = old_hdr.reply_len; /* structure abuse ... */
hp->flags = input_size; /* structure abuse ... */
}
static ssize_t
-sg_new_write(Sg_fd * sfp, const char *buf, size_t count,
+sg_new_write(Sg_fd * sfp, const char __user *buf, size_t count,
int blocking, int read_only, Sg_request ** o_srp)
{
int k;
sg_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd_in, unsigned long arg)
{
+ void __user *p = (void __user *)arg;
+ int __user *ip = p;
int result, val, read_only;
Sg_device *sdp;
Sg_fd *sfp;
return -ENODEV;
if (!scsi_block_when_processing_errors(sdp->device))
return -ENXIO;
- result = verify_area(VERIFY_WRITE, (void *) arg,
- SZ_SG_IO_HDR);
+ result = verify_area(VERIFY_WRITE, p, SZ_SG_IO_HDR);
if (result)
return result;
result =
- sg_new_write(sfp, (const char *) arg, SZ_SG_IO_HDR,
+ sg_new_write(sfp, p, SZ_SG_IO_HDR,
blocking, read_only, &srp);
if (result < 0)
return result;
return result; /* -ERESTARTSYS because signal hit process */
}
srp->done = 2;
- result = sg_new_read(sfp, (char *) arg, SZ_SG_IO_HDR, srp);
+ result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp);
return (result < 0) ? result : 0;
}
case SG_SET_TIMEOUT:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
if (val < 0)
/* strange ..., for backward compatibility */
return sfp->timeout_user;
case SG_SET_FORCE_LOW_DMA:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
if (val) {
}
return 0;
case SG_GET_LOW_DMA:
- return put_user((int) sfp->low_dma, (int *) arg);
+ return put_user((int) sfp->low_dma, ip);
case SG_GET_SCSI_ID:
result =
- verify_area(VERIFY_WRITE, (void *) arg,
- sizeof (sg_scsi_id_t));
+ verify_area(VERIFY_WRITE, p, sizeof (sg_scsi_id_t));
if (result)
return result;
else {
- sg_scsi_id_t *sg_idp = (sg_scsi_id_t *) arg;
+ sg_scsi_id_t __user *sg_idp = p;
if (sdp->detached)
return -ENODEV;
return 0;
}
case SG_SET_FORCE_PACK_ID:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
sfp->force_packid = val ? 1 : 0;
return 0;
case SG_GET_PACK_ID:
- result = verify_area(VERIFY_WRITE, (void *) arg, sizeof (int));
+ result = verify_area(VERIFY_WRITE, ip, sizeof (int));
if (result)
return result;
read_lock_irqsave(&sfp->rq_list_lock, iflags);
if ((1 == srp->done) && (!srp->sg_io_owned)) {
read_unlock_irqrestore(&sfp->rq_list_lock,
iflags);
- __put_user(srp->header.pack_id, (int *) arg);
+ __put_user(srp->header.pack_id, ip);
return 0;
}
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
- __put_user(-1, (int *) arg);
+ __put_user(-1, ip);
return 0;
case SG_GET_NUM_WAITING:
read_lock_irqsave(&sfp->rq_list_lock, iflags);
++val;
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
- return put_user(val, (int *) arg);
+ return put_user(val, ip);
case SG_GET_SG_TABLESIZE:
- return put_user(sdp->sg_tablesize, (int *) arg);
+ return put_user(sdp->sg_tablesize, ip);
case SG_SET_RESERVED_SIZE:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
if (val < 0)
return 0;
case SG_GET_RESERVED_SIZE:
val = (int) sfp->reserve.bufflen;
- return put_user(val, (int *) arg);
+ return put_user(val, ip);
case SG_SET_COMMAND_Q:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
sfp->cmd_q = val ? 1 : 0;
return 0;
case SG_GET_COMMAND_Q:
- return put_user((int) sfp->cmd_q, (int *) arg);
+ return put_user((int) sfp->cmd_q, ip);
case SG_SET_KEEP_ORPHAN:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
sfp->keep_orphan = val;
return 0;
case SG_GET_KEEP_ORPHAN:
- return put_user((int) sfp->keep_orphan, (int *) arg);
+ return put_user((int) sfp->keep_orphan, ip);
case SG_NEXT_CMD_LEN:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
sfp->next_cmd_len = (val > 0) ? val : 0;
return 0;
case SG_GET_VERSION_NUM:
- return put_user(sg_version_num, (int *) arg);
+ return put_user(sg_version_num, ip);
case SG_GET_ACCESS_COUNT:
/* faked - we don't have a real access count anymore */
val = (sdp->device ? 1 : 0);
- return put_user(val, (int *) arg);
+ return put_user(val, ip);
case SG_GET_REQUEST_TABLE:
- result = verify_area(VERIFY_WRITE, (void *) arg,
+ result = verify_area(VERIFY_WRITE, p,
SZ_SG_REQ_INFO * SG_MAX_QUEUE);
if (result)
return result;
}
}
read_unlock_irqrestore(&sfp->rq_list_lock, iflags);
- return (__copy_to_user((void *) arg, rinfo,
+ return (__copy_to_user(p, rinfo,
SZ_SG_REQ_INFO * SG_MAX_QUEUE) ? -EFAULT : 0);
}
case SG_EMULATED_HOST:
if (sdp->detached)
return -ENODEV;
- return put_user(sdp->device->host->hostt->emulated, (int *) arg);
+ return put_user(sdp->device->host->hostt->emulated, ip);
case SG_SCSI_RESET:
if (sdp->detached)
return -ENODEV;
return -EBUSY;
} else if (!scsi_block_when_processing_errors(sdp->device))
return -EBUSY;
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
if (SG_SCSI_RESET_NOTHING == val)
return -ENODEV;
if (read_only) {
unsigned char opcode = WRITE_6;
- Scsi_Ioctl_Command *siocp = (void *) arg;
+ Scsi_Ioctl_Command __user *siocp = p;
if (copy_from_user(&opcode, siocp->data, 1))
return -EFAULT;
if (!sg_allow_access(opcode, sdp->device->type))
return -EPERM;
}
- return scsi_ioctl_send_command(sdp->device, (void *) arg);
+ return scsi_ioctl_send_command(sdp->device, p);
case SG_SET_DEBUG:
- result = get_user(val, (int *) arg);
+ result = get_user(val, ip);
if (result)
return result;
sdp->sgdebug = (char) val;
case SG_GET_TRANSFORM:
if (sdp->detached)
return -ENODEV;
- return scsi_ioctl(sdp->device, cmd_in, (void *) arg);
+ return scsi_ioctl(sdp->device, cmd_in, p);
default:
if (read_only)
return -EPERM; /* don't know so take safe approach */
- return scsi_ioctl(sdp->device, cmd_in, (void *) arg);
+ return scsi_ioctl(sdp->device, cmd_in, p);
}
}
page_ptr = sg_scatg2virt(sclp) + m;
page = virt_to_page(page_ptr);
if (startFinish)
- atomic_inc(&page->count);
+ get_page(page);
else {
if (page_count(page) > 0)
- atomic_dec(&page->count);
+ __put_page(page);
}
}
}
page_ptr = (unsigned char *) rsv_schp->buffer + m;
page = virt_to_page(page_ptr);
if (startFinish)
- atomic_inc(&page->count);
+ get_page(page);
else {
if (page_count(page) > 0)
- atomic_dec(&page->count);
+ __put_page(page);
}
}
}
static int sg_sysfs_valid = 0;
-static int
-sg_add(struct class_device *cl_dev)
+static int sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
{
- struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
- struct gendisk *disk;
- Sg_device *sdp = NULL;
+ Sg_device *sdp;
unsigned long iflags;
- struct cdev * cdev = NULL;
+ void *old_sg_dev_arr = NULL;
int k, error;
- disk = alloc_disk(1);
- if (!disk)
+ sdp = vmalloc(sizeof(Sg_device));
+ if (!sdp)
return -ENOMEM;
- cdev = cdev_alloc();
- if (! cdev)
- return -ENOMEM;
write_lock_irqsave(&sg_dev_arr_lock, iflags);
- if (sg_nr_dev >= sg_dev_max) { /* try to resize */
+ if (unlikely(sg_nr_dev >= sg_dev_max)) { /* try to resize */
Sg_device **tmp_da;
int tmp_dev_max = sg_nr_dev + SG_DEV_ARR_LUMP;
-
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
- tmp_da = (Sg_device **)vmalloc(
- tmp_dev_max * sizeof(Sg_device *));
- if (NULL == tmp_da) {
- printk(KERN_ERR
- "sg_add: device array cannot be resized\n");
- error = -ENOMEM;
- goto out;
- }
+
+ tmp_da = vmalloc(tmp_dev_max * sizeof(Sg_device *));
+ if (unlikely(!tmp_da))
+ goto expand_failed;
+
write_lock_irqsave(&sg_dev_arr_lock, iflags);
- memset(tmp_da, 0, tmp_dev_max * sizeof (Sg_device *));
- memcpy(tmp_da, sg_dev_arr,
- sg_dev_max * sizeof (Sg_device *));
- vfree((char *) sg_dev_arr);
+ memset(tmp_da, 0, tmp_dev_max * sizeof(Sg_device *));
+ memcpy(tmp_da, sg_dev_arr, sg_dev_max * sizeof(Sg_device *));
+ old_sg_dev_arr = sg_dev_arr;
sg_dev_arr = tmp_da;
sg_dev_max = tmp_dev_max;
}
-find_empty_slot:
for (k = 0; k < sg_dev_max; k++)
if (!sg_dev_arr[k])
break;
- if (k >= SG_MAX_DEVS) {
- write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
- printk(KERN_WARNING
- "Unable to attach sg device <%d, %d, %d, %d>"
- " type=%d, minor number exceeds %d\n",
- scsidp->host->host_no, scsidp->channel, scsidp->id,
- scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
- if (NULL != sdp)
- vfree((char *) sdp);
- error = -ENODEV;
- goto out;
- }
- if (k < sg_dev_max) {
- if (NULL == sdp) {
- write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
- sdp = (Sg_device *)vmalloc(sizeof(Sg_device));
- write_lock_irqsave(&sg_dev_arr_lock, iflags);
- if (!sg_dev_arr[k])
- goto find_empty_slot;
- }
- } else
- sdp = NULL;
- if (NULL == sdp) {
- write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
- printk(KERN_ERR "sg_add: Sg_device cannot be allocated\n");
- error = -ENOMEM;
- goto out;
- }
+ if (unlikely(k >= SG_MAX_DEVS))
+ goto overflow;
- SCSI_LOG_TIMEOUT(3, printk("sg_add: dev=%d \n", k));
memset(sdp, 0, sizeof(*sdp));
+ SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
sprintf(disk->disk_name, "sg%d", k);
- cdev->owner = THIS_MODULE;
- cdev->ops = &sg_fops;
- disk->major = SCSI_GENERIC_MAJOR;
disk->first_minor = k;
sdp->disk = disk;
sdp->device = scsidp;
sg_nr_dev++;
sg_dev_arr[k] = sdp;
write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ error = k;
+
+ out:
+ if (error < 0)
+ vfree(sdp);
+ vfree(old_sg_dev_arr);
+ return error;
+
+ expand_failed:
+ printk(KERN_ERR "sg_alloc: device array cannot be resized\n");
+ error = -ENOMEM;
+ goto out;
+
+ overflow:
+ write_unlock_irqrestore(&sg_dev_arr_lock, iflags);
+ printk(KERN_WARNING
+ "Unable to attach sg device <%d, %d, %d, %d> type=%d, minor "
+ "number exceeds %d\n", scsidp->host->host_no, scsidp->channel,
+ scsidp->id, scsidp->lun, scsidp->type, SG_MAX_DEVS - 1);
+ error = -ENODEV;
+ goto out;
+}
+
+static int
+sg_add(struct class_device *cl_dev)
+{
+ struct scsi_device *scsidp = to_scsi_device(cl_dev->dev);
+ struct gendisk *disk;
+ Sg_device *sdp = NULL;
+ struct cdev * cdev = NULL;
+ int error, k;
+
+ disk = alloc_disk(1);
+ if (!disk)
+ return -ENOMEM;
+ disk->major = SCSI_GENERIC_MAJOR;
+
+ error = -ENOMEM;
+ cdev = cdev_alloc();
+ if (!cdev)
+ goto out;
+ cdev->owner = THIS_MODULE;
+ cdev->ops = &sg_fops;
+
+ error = sg_alloc(disk, scsidp);
+ if (error < 0)
+ goto out;
+ k = error;
+ sdp = sg_dev_arr[k];
devfs_mk_cdev(MKDEV(SCSI_GENERIC_MAJOR, k),
S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP,
MODULE_AUTHOR("Douglas Gilbert");
MODULE_DESCRIPTION("SCSI generic (sg) driver");
MODULE_LICENSE("GPL");
+MODULE_VERSION(SG_VERSION_STR);
MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd");
MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))");
int iovec_count = (int) hp->iovec_count;
int dxfer_dir = hp->dxfer_direction;
unsigned char *p;
- unsigned char *up;
+ unsigned char __user *up;
int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_TO_DEV == dxfer_dir) ||
static int
sg_u_iovec(sg_io_hdr_t * hp, int sg_num, int ind,
- int wr_xf, int *countp, unsigned char **up)
+ int wr_xf, int *countp, unsigned char __user **up)
{
int num_xfer = (int) hp->dxfer_len;
- unsigned char *p;
+ unsigned char __user *p = hp->dxferp;
int count, k;
- sg_iovec_t u_iovec;
if (0 == sg_num) {
- p = (unsigned char *) hp->dxferp;
if (wr_xf && ('\0' == hp->interface_id))
count = (int) hp->flags; /* holds "old" input_size */
else
count = num_xfer;
} else {
- if (__copy_from_user(&u_iovec,
- (unsigned char *) hp->dxferp +
- (ind * SZ_SG_IOVEC), SZ_SG_IOVEC))
+ sg_iovec_t iovec;
+ if (__copy_from_user(&iovec, p + ind*SZ_SG_IOVEC, SZ_SG_IOVEC))
return -EFAULT;
- p = (unsigned char *) u_iovec.iov_base;
- count = (int) u_iovec.iov_len;
+ p = iovec.iov_base;
+ count = (int) iovec.iov_len;
}
if ((k = verify_area(wr_xf ? VERIFY_READ : VERIFY_WRITE, p, count)))
return k;
int iovec_count = (int) hp->iovec_count;
int dxfer_dir = hp->dxfer_direction;
unsigned char *p;
- unsigned char *up;
+ unsigned char __user *up;
int new_interface = ('\0' == hp->interface_id) ? 0 : 1;
if ((SG_DXFER_UNKNOWN == dxfer_dir) || (SG_DXFER_FROM_DEV == dxfer_dir)
}
static int
-sg_read_oxfer(Sg_request * srp, char *outp, int num_read_xfer)
+sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
{
Sg_scatter_hold *schp = &srp->data;
static int sg_proc_seq_show_version(struct seq_file *s, void *v)
{
- seq_printf(s, "%d\t%s\n", sg_version_num, sg_version_str);
+ seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR,
+ sg_version_date);
return 0;
}
git://git.onelab.eu / linux-2.6.git / blobdiff