mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
bsg: replace SG v3 with SG v4
This patch replaces SG v3 in bsg with SG v4 (except for SG_IO). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
FUJITA Tomonori
Jens Axboe
parent
45977d0e87
commit
70e36eceaf
212
block/bsg.c
212
block/bsg.c
@ -103,8 +103,8 @@ struct bsg_command {
|
||||
struct request *rq;
|
||||
struct bio *bio;
|
||||
int err;
|
||||
struct sg_io_hdr hdr;
|
||||
struct sg_io_hdr __user *uhdr;
|
||||
struct sg_io_v4 hdr;
|
||||
struct sg_io_v4 __user *uhdr;
|
||||
char sense[SCSI_SENSE_BUFFERSIZE];
|
||||
};
|
||||
|
||||
@ -235,57 +235,82 @@ static struct bsg_command *bsg_get_command(struct bsg_device *bd)
|
||||
return bc;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check if sg_io_hdr from user is allowed and valid
|
||||
*/
|
||||
static int
|
||||
bsg_validate_sghdr(request_queue_t *q, struct sg_io_hdr *hdr, int *rw)
|
||||
static int blk_fill_sgv4_hdr_rq(request_queue_t *q, struct request *rq,
|
||||
struct sg_io_v4 *hdr, int has_write_perm)
|
||||
{
|
||||
if (hdr->interface_id != 'S')
|
||||
return -EINVAL;
|
||||
if (hdr->cmd_len > BLK_MAX_CDB)
|
||||
return -EINVAL;
|
||||
if (hdr->dxfer_len > (q->max_sectors << 9))
|
||||
return -EIO;
|
||||
memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
|
||||
|
||||
if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request,
|
||||
hdr->request_len))
|
||||
return -EFAULT;
|
||||
if (blk_verify_command(rq->cmd, has_write_perm))
|
||||
return -EPERM;
|
||||
|
||||
/*
|
||||
* looks sane, if no data then it should be fine from our POV
|
||||
* fill in request structure
|
||||
*/
|
||||
if (!hdr->dxfer_len)
|
||||
return 0;
|
||||
rq->cmd_len = hdr->request_len;
|
||||
rq->cmd_type = REQ_TYPE_BLOCK_PC;
|
||||
|
||||
switch (hdr->dxfer_direction) {
|
||||
case SG_DXFER_TO_FROM_DEV:
|
||||
case SG_DXFER_FROM_DEV:
|
||||
*rw = READ;
|
||||
break;
|
||||
case SG_DXFER_TO_DEV:
|
||||
*rw = WRITE;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
rq->timeout = (hdr->timeout * HZ) / 1000;
|
||||
if (!rq->timeout)
|
||||
rq->timeout = q->sg_timeout;
|
||||
if (!rq->timeout)
|
||||
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* map sg_io_hdr to a request. for scatter-gather sg_io_hdr, we map
|
||||
* each segment to a bio and string multiple bio's to the request
|
||||
* Check if sg_io_v4 from user is allowed and valid
|
||||
*/
|
||||
static int
|
||||
bsg_validate_sgv4_hdr(request_queue_t *q, struct sg_io_v4 *hdr, int *rw)
|
||||
{
|
||||
if (hdr->guard != 'Q')
|
||||
return -EINVAL;
|
||||
if (hdr->request_len > BLK_MAX_CDB)
|
||||
return -EINVAL;
|
||||
if (hdr->dout_xfer_len > (q->max_sectors << 9) ||
|
||||
hdr->din_xfer_len > (q->max_sectors << 9))
|
||||
return -EIO;
|
||||
|
||||
/* not supported currently */
|
||||
if (hdr->protocol || hdr->subprotocol)
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* looks sane, if no data then it should be fine from our POV
|
||||
*/
|
||||
if (!hdr->dout_xfer_len && !hdr->din_xfer_len)
|
||||
return 0;
|
||||
|
||||
/* not supported currently */
|
||||
if (hdr->dout_xfer_len && hdr->din_xfer_len)
|
||||
return -EINVAL;
|
||||
|
||||
*rw = hdr->dout_xfer_len ? WRITE : READ;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* map sg_io_v4 to a request.
|
||||
*/
|
||||
static struct request *
|
||||
bsg_map_hdr(struct bsg_device *bd, int rw, struct sg_io_hdr *hdr)
|
||||
bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr)
|
||||
{
|
||||
request_queue_t *q = bd->queue;
|
||||
struct sg_iovec iov;
|
||||
struct sg_iovec __user *u_iov;
|
||||
struct request *rq;
|
||||
int ret, i = 0;
|
||||
int ret, rw;
|
||||
unsigned int dxfer_len;
|
||||
void *dxferp = NULL;
|
||||
|
||||
dprintk("map hdr %p/%d/%d\n", hdr->dxferp, hdr->dxfer_len,
|
||||
hdr->iovec_count);
|
||||
dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp,
|
||||
hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp,
|
||||
hdr->din_xfer_len);
|
||||
|
||||
ret = bsg_validate_sghdr(q, hdr, &rw);
|
||||
ret = bsg_validate_sgv4_hdr(q, hdr, &rw);
|
||||
if (ret)
|
||||
return ERR_PTR(ret);
|
||||
|
||||
@ -293,44 +318,29 @@ bsg_map_hdr(struct bsg_device *bd, int rw, struct sg_io_hdr *hdr)
|
||||
* map scatter-gather elements seperately and string them to request
|
||||
*/
|
||||
rq = blk_get_request(q, rw, GFP_KERNEL);
|
||||
ret = blk_fill_sghdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM,
|
||||
&bd->flags));
|
||||
ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, test_bit(BSG_F_WRITE_PERM,
|
||||
&bd->flags));
|
||||
if (ret) {
|
||||
blk_put_request(rq);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
if (!hdr->iovec_count) {
|
||||
ret = blk_rq_map_user(q, rq, hdr->dxferp, hdr->dxfer_len);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
if (hdr->dout_xfer_len) {
|
||||
dxfer_len = hdr->dout_xfer_len;
|
||||
dxferp = (void*)(unsigned long)hdr->dout_xferp;
|
||||
} else if (hdr->din_xfer_len) {
|
||||
dxfer_len = hdr->din_xfer_len;
|
||||
dxferp = (void*)(unsigned long)hdr->din_xferp;
|
||||
} else
|
||||
dxfer_len = 0;
|
||||
|
||||
u_iov = hdr->dxferp;
|
||||
for (ret = 0, i = 0; i < hdr->iovec_count; i++, u_iov++) {
|
||||
if (copy_from_user(&iov, u_iov, sizeof(iov))) {
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
if (dxfer_len) {
|
||||
ret = blk_rq_map_user(q, rq, dxferp, dxfer_len);
|
||||
if (ret) {
|
||||
dprintk("failed map at %d\n", ret);
|
||||
blk_put_request(rq);
|
||||
rq = ERR_PTR(ret);
|
||||
}
|
||||
|
||||
if (!iov.iov_len || !iov.iov_base) {
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
ret = blk_rq_map_user(q, rq, iov.iov_base, iov.iov_len);
|
||||
if (ret)
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* bugger, cleanup
|
||||
*/
|
||||
if (ret) {
|
||||
out:
|
||||
dprintk("failed map at %d: %d\n", i, ret);
|
||||
blk_unmap_sghdr_rq(rq, hdr);
|
||||
rq = ERR_PTR(ret);
|
||||
}
|
||||
|
||||
return rq;
|
||||
@ -346,7 +356,7 @@ static void bsg_rq_end_io(struct request *rq, int uptodate)
|
||||
struct bsg_device *bd = bc->bd;
|
||||
unsigned long flags;
|
||||
|
||||
dprintk("%s: finished rq %p bc %p, bio %p offset %d stat %d\n",
|
||||
dprintk("%s: finished rq %p bc %p, bio %p offset %Zd stat %d\n",
|
||||
bd->name, rq, bc, bc->bio, bc - bd->cmd_map, uptodate);
|
||||
|
||||
bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration);
|
||||
@ -434,6 +444,42 @@ bsg_get_done_cmd_nosignals(struct bsg_device *bd)
|
||||
return __bsg_get_done_cmd(bd, TASK_UNINTERRUPTIBLE);
|
||||
}
|
||||
|
||||
static int blk_complete_sgv4_hdr_rq(struct request *rq, struct sg_io_v4 *hdr,
|
||||
struct bio *bio)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
dprintk("rq %p bio %p %u\n", rq, bio, rq->errors);
|
||||
/*
|
||||
* fill in all the output members
|
||||
*/
|
||||
hdr->device_status = status_byte(rq->errors);
|
||||
hdr->transport_status = host_byte(rq->errors);
|
||||
hdr->driver_status = driver_byte(rq->errors);
|
||||
hdr->info = 0;
|
||||
if (hdr->device_status || hdr->transport_status || hdr->driver_status)
|
||||
hdr->info |= SG_INFO_CHECK;
|
||||
hdr->din_resid = rq->data_len;
|
||||
hdr->response_len = 0;
|
||||
|
||||
if (rq->sense_len && hdr->response) {
|
||||
int len = min((unsigned int) hdr->max_response_len,
|
||||
rq->sense_len);
|
||||
|
||||
ret = copy_to_user((void*)(unsigned long)hdr->response,
|
||||
rq->sense, len);
|
||||
if (!ret)
|
||||
hdr->response_len = len;
|
||||
else
|
||||
ret = -EFAULT;
|
||||
}
|
||||
|
||||
blk_rq_unmap_user(bio);
|
||||
blk_put_request(rq);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int bsg_complete_all_commands(struct bsg_device *bd)
|
||||
{
|
||||
struct bsg_command *bc;
|
||||
@ -476,7 +522,7 @@ static int bsg_complete_all_commands(struct bsg_device *bd)
|
||||
break;
|
||||
}
|
||||
|
||||
tret = blk_complete_sghdr_rq(bc->rq, &bc->hdr, bc->bio);
|
||||
tret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio);
|
||||
if (!ret)
|
||||
ret = tret;
|
||||
|
||||
@ -495,11 +541,11 @@ __bsg_read(char __user *buf, size_t count, bsg_command_callback get_bc,
|
||||
struct bsg_command *bc;
|
||||
int nr_commands, ret;
|
||||
|
||||
if (count % sizeof(struct sg_io_hdr))
|
||||
if (count % sizeof(struct sg_io_v4))
|
||||
return -EINVAL;
|
||||
|
||||
ret = 0;
|
||||
nr_commands = count / sizeof(struct sg_io_hdr);
|
||||
nr_commands = count / sizeof(struct sg_io_v4);
|
||||
while (nr_commands) {
|
||||
bc = get_bc(bd, iov);
|
||||
if (IS_ERR(bc)) {
|
||||
@ -512,7 +558,7 @@ __bsg_read(char __user *buf, size_t count, bsg_command_callback get_bc,
|
||||
* after completing the request. so do that here,
|
||||
* bsg_complete_work() cannot do that for us
|
||||
*/
|
||||
ret = blk_complete_sghdr_rq(bc->rq, &bc->hdr, bc->bio);
|
||||
ret = blk_complete_sgv4_hdr_rq(bc->rq, &bc->hdr, bc->bio);
|
||||
|
||||
if (copy_to_user(buf, (char *) &bc->hdr, sizeof(bc->hdr)))
|
||||
ret = -EFAULT;
|
||||
@ -522,8 +568,8 @@ __bsg_read(char __user *buf, size_t count, bsg_command_callback get_bc,
|
||||
if (ret)
|
||||
break;
|
||||
|
||||
buf += sizeof(struct sg_io_hdr);
|
||||
*bytes_read += sizeof(struct sg_io_hdr);
|
||||
buf += sizeof(struct sg_io_v4);
|
||||
*bytes_read += sizeof(struct sg_io_v4);
|
||||
nr_commands--;
|
||||
}
|
||||
|
||||
@ -582,16 +628,15 @@ static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
|
||||
struct request *rq;
|
||||
int ret, nr_commands;
|
||||
|
||||
if (count % sizeof(struct sg_io_hdr))
|
||||
if (count % sizeof(struct sg_io_v4))
|
||||
return -EINVAL;
|
||||
|
||||
nr_commands = count / sizeof(struct sg_io_hdr);
|
||||
nr_commands = count / sizeof(struct sg_io_v4);
|
||||
rq = NULL;
|
||||
bc = NULL;
|
||||
ret = 0;
|
||||
while (nr_commands) {
|
||||
request_queue_t *q = bd->queue;
|
||||
int rw = READ;
|
||||
|
||||
bc = bsg_get_command(bd);
|
||||
if (!bc)
|
||||
@ -602,7 +647,7 @@ static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
|
||||
break;
|
||||
}
|
||||
|
||||
bc->uhdr = (struct sg_io_hdr __user *) buf;
|
||||
bc->uhdr = (struct sg_io_v4 __user *) buf;
|
||||
if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) {
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
@ -611,7 +656,7 @@ static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
|
||||
/*
|
||||
* get a request, fill in the blanks, and add to request queue
|
||||
*/
|
||||
rq = bsg_map_hdr(bd, rw, &bc->hdr);
|
||||
rq = bsg_map_hdr(bd, &bc->hdr);
|
||||
if (IS_ERR(rq)) {
|
||||
ret = PTR_ERR(rq);
|
||||
rq = NULL;
|
||||
@ -622,12 +667,10 @@ static ssize_t __bsg_write(struct bsg_device *bd, const char __user *buf,
|
||||
bc = NULL;
|
||||
rq = NULL;
|
||||
nr_commands--;
|
||||
buf += sizeof(struct sg_io_hdr);
|
||||
*bytes_read += sizeof(struct sg_io_hdr);
|
||||
buf += sizeof(struct sg_io_v4);
|
||||
*bytes_read += sizeof(struct sg_io_v4);
|
||||
}
|
||||
|
||||
if (rq)
|
||||
blk_unmap_sghdr_rq(rq, &bc->hdr);
|
||||
if (bc)
|
||||
bsg_free_command(bc);
|
||||
|
||||
@ -898,11 +941,12 @@ bsg_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
|
||||
case SG_GET_RESERVED_SIZE:
|
||||
case SG_SET_RESERVED_SIZE:
|
||||
case SG_EMULATED_HOST:
|
||||
case SG_IO:
|
||||
case SCSI_IOCTL_SEND_COMMAND: {
|
||||
void __user *uarg = (void __user *) arg;
|
||||
return scsi_cmd_ioctl(file, bd->disk, cmd, uarg);
|
||||
}
|
||||
case SG_IO:
|
||||
return -EINVAL;
|
||||
/*
|
||||
* block device ioctls
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user