#include <scsi/scsi_ioctl.h>
#include <scsi/scsi_cmnd.h>
+struct blk_cmd_filter {
+ unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
+ unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
+} blk_default_cmd_filter;
+
/* Command group 3 is reserved and should never be used. */
const unsigned char scsi_command_size_tbl[8] =
{
static int sg_get_timeout(struct request_queue *q)
{
- return q->sg_timeout / (HZ / USER_HZ);
+ return jiffies_to_clock_t(q->sg_timeout);
}
static int sg_set_timeout(struct request_queue *q, int __user *p)
int timeout, err = get_user(timeout, p);
if (!err)
- q->sg_timeout = timeout * (HZ / USER_HZ);
+ q->sg_timeout = clock_t_to_jiffies(timeout);
return err;
}
static int sg_get_reserved_size(struct request_queue *q, int __user *p)
{
- unsigned val = min(q->sg_reserved_size, q->max_sectors << 9);
+ unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
return put_user(val, p);
}
if (size < 0)
return -EINVAL;
- if (size > (q->max_sectors << 9))
- size = q->max_sectors << 9;
+ if (size > (queue_max_sectors(q) << 9))
+ size = queue_max_sectors(q) << 9;
q->sg_reserved_size = size;
return 0;
return put_user(1, p);
}
-void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
+static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
{
/* Basic read-only commands */
__set_bit(TEST_UNIT_READY, filter->read_ok);
__set_bit(GPCMD_SET_STREAMING, filter->write_ok);
__set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
}
-EXPORT_SYMBOL_GPL(blk_set_cmd_filter_defaults);
+
+int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
+{
+ struct blk_cmd_filter *filter = &blk_default_cmd_filter;
+
+ /* root can do any command. */
+ if (capable(CAP_SYS_RAWIO))
+ return 0;
+
+ /* if there's no filter set, assume we're filtering everything out */
+ if (!filter)
+ return -EPERM;
+
+ /* Anybody who can open the device can do a read-safe command */
+ if (test_bit(cmd[0], filter->read_ok))
+ return 0;
+
+ /* Write-safe commands require a writable open */
+ if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
+ return 0;
+
+ return -EPERM;
+}
+EXPORT_SYMBOL(blk_verify_command);
static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
struct sg_io_hdr *hdr, fmode_t mode)
{
if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
return -EFAULT;
- if (blk_verify_command(&q->cmd_filter, rq->cmd, mode & FMODE_WRITE))
+ if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
return -EPERM;
/*
rq->timeout = q->sg_timeout;
if (!rq->timeout)
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
+ if (rq->timeout < BLK_MIN_SG_TIMEOUT)
+ rq->timeout = BLK_MIN_SG_TIMEOUT;
return 0;
}
-/*
- * unmap a request that was previously mapped to this sg_io_hdr. handles
- * both sg and non-sg sg_io_hdr.
- */
-static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)
-{
- blk_rq_unmap_user(rq->bio);
- blk_put_request(rq);
- return 0;
-}
-
static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
struct bio *bio)
{
hdr->info = 0;
if (hdr->masked_status || hdr->host_status || hdr->driver_status)
hdr->info |= SG_INFO_CHECK;
- hdr->resid = rq->data_len;
+ hdr->resid = rq->resid_len;
hdr->sb_len_wr = 0;
if (rq->sense_len && hdr->sbp) {
ret = -EFAULT;
}
- rq->bio = bio;
- r = blk_unmap_sghdr_rq(rq, hdr);
- if (ret)
- r = ret;
+ r = blk_rq_unmap_user(bio);
+ if (!ret)
+ ret = r;
+ blk_put_request(rq);
- return r;
+ return ret;
}
static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
if (hdr->cmd_len > BLK_MAX_CDB)
return -EINVAL;
- if (hdr->dxfer_len > (q->max_hw_sectors << 9))
+ if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
return -EIO;
if (hdr->dxfer_len)
if (hdr->iovec_count) {
const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
+ size_t iov_data_len;
struct sg_iovec *iov;
iov = kmalloc(size, GFP_KERNEL);
goto out;
}
+ /* SG_IO howto says that the shorter of the two wins */
+ iov_data_len = iov_length((struct iovec *)iov,
+ hdr->iovec_count);
+ if (hdr->dxfer_len < iov_data_len) {
+ hdr->iovec_count = iov_shorten((struct iovec *)iov,
+ hdr->iovec_count,
+ hdr->dxfer_len);
+ iov_data_len = hdr->dxfer_len;
+ }
+
ret = blk_rq_map_user_iov(q, rq, NULL, iov, hdr->iovec_count,
- hdr->dxfer_len, GFP_KERNEL);
+ iov_data_len, GFP_KERNEL);
kfree(iov);
} else if (hdr->dxfer_len)
ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
goto error;
- err = blk_verify_command(&q->cmd_filter, rq->cmd, mode & FMODE_WRITE);
+ err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
if (err)
goto error;
rq = blk_get_request(q, WRITE, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_BLOCK_PC;
- rq->data = NULL;
- rq->data_len = 0;
- rq->extra_len = 0;
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
rq->cmd[0] = cmd;
rq->cmd[4] = data;
blk_put_queue(q);
return err;
}
-
EXPORT_SYMBOL(scsi_cmd_ioctl);
+
+int __init blk_scsi_ioctl_init(void)
+{
+ blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
+ return 0;
+}
+fs_initcall(blk_scsi_ioctl_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff