scsi: Implement sg_printk()

Update the sg driver to use dev_printk() variants instead of
plain printk(); this will prefix logging messages with the
appropriate device.

Signed-off-by: Hannes Reinecke <[e-mail]>
Acked-by: Doug Gilbert <[e-mail]>
Reviewed-by: Martin K. Petersen <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Christoph Hellwig <[e-mail]>

drivers/scsi/sg.c

···
 static int sg_common_write(Sg_fd * sfp, Sg_request * srp,
 			   unsigned char *cmnd, int timeout, int blocking);
 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_remove_scat(Sg_fd * sfp, 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 void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp);
-static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev);
+static Sg_fd *sg_add_sfp(Sg_device * sdp);
 static void sg_remove_sfp(struct kref *);
 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id);
 static Sg_request *sg_add_request(Sg_fd * sfp);
···
 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
 #define SZ_SG_IOVEC sizeof(sg_iovec_t)
 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t)
+
+#define sg_printk(prefix, sdp, fmt, a...) \
+	sdev_printk(prefix, (sdp)->device, "[%s] " fmt, \
+		    (sdp)->disk->disk_name, ##a)
 
 static int sg_allow_access(struct file *filp, unsigned char *cmd)
 {
···
 	int retval;
 
 	nonseekable_open(inode, filp);
-	SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
 	if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE)))
 		return -EPERM; /* Can't lock it with read only access */
 	sdp = sg_get_dev(dev);
 	if (IS_ERR(sdp))
 		return PTR_ERR(sdp);
+
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "sg_open: flags=0x%x\n", flags));
 
 	/* This driver's module count bumped by fops_get in <linux/fs.h> */
 	/* Prevent the device driver from vanishing while we sleep */
···
 		q = sdp->device->request_queue;
 		sdp->sg_tablesize = queue_max_segments(q);
 	}
-	sfp = sg_add_sfp(sdp, dev);
+	sfp = sg_add_sfp(sdp);
 	if (IS_ERR(sfp)) {
 		retval = PTR_ERR(sfp);
 		goto out_undo;
···
 
 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 		return -ENXIO;
-	SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n"));
 
 	mutex_lock(&sdp->open_rel_lock);
 	scsi_autopm_put_device(sdp->device);
···
 
 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 		return -ENXIO;
-	SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n",
-				   sdp->disk->disk_name, (int) count));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "sg_read: count=%d\n", (int) count));
 
 	if (!access_ok(VERIFY_WRITE, buf, count))
 		return -EFAULT;
···
 
 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 		return -ENXIO;
-	SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n",
-				   sdp->disk->disk_name, (int) count));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "sg_write: count=%d\n", (int) count));
 	if (atomic_read(&sdp->detaching))
 		return -ENODEV;
 	if (!((filp->f_flags & O_NONBLOCK) ||
···
 		return -EIO;	/* The minimum scsi command length is 6 bytes. */
 
 	if (!(srp = sg_add_request(sfp))) {
-		SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n"));
+		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp,
+					      "sg_write: queue full\n"));
 		return -EDOM;
 	}
 	buf += SZ_SG_HEADER;
···
 		if ((opcode >= 0xc0) && old_hdr.twelve_byte)
 			cmd_size = 12;
 	}
-	SCSI_LOG_TIMEOUT(4, printk(
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
 		"sg_write:   scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size));
 /* Determine buffer size.  */
 	input_size = count - cmd_size;
···
 
 	sfp->cmd_q = 1;	/* when sg_io_hdr seen, set command queuing on */
 	if (!(srp = sg_add_request(sfp))) {
-		SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n"));
+		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
+					      "sg_new_write: queue full\n"));
 		return -EDOM;
 	}
 	srp->sg_io_owned = sg_io_owned;
···
 	hp->host_status = 0;
 	hp->driver_status = 0;
 	hp->resid = 0;
-	SCSI_LOG_TIMEOUT(4, printk("sg_common_write:  scsi opcode=0x%02x, cmd_size=%d\n",
-			  (int) cmnd[0], (int) hp->cmd_len));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+			"sg_common_write:  scsi opcode=0x%02x, cmd_size=%d\n",
+			(int) cmnd[0], (int) hp->cmd_len));
 
 	k = sg_start_req(srp, cmnd);
 	if (k) {
-		SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k));
+		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
+			"sg_common_write: start_req err=%d\n", k));
 		sg_finish_rem_req(srp);
 		return k;	/* probably out of space --> ENOMEM */
 	}
···
 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 		return -ENXIO;
 
-	SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n",
-				   sdp->disk->disk_name, (int) cmd_in));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				   "sg_ioctl: cmd=0x%x\n", (int) cmd_in));
 	read_only = (O_RDWR != (filp->f_flags & O_ACCMODE));
 
 	switch (cmd_in) {
···
 			sfp->low_dma = 1;
 			if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) {
 				val = (int) sfp->reserve.bufflen;
-				sg_remove_scat(&sfp->reserve);
+				sg_remove_scat(sfp, &sfp->reserve);
 				sg_build_reserve(sfp, val);
 			}
 		} else {
···
 		if (val != sfp->reserve.bufflen) {
 			if (sg_res_in_use(sfp) || sfp->mmap_called)
 				return -EBUSY;
-			sg_remove_scat(&sfp->reserve);
+			sg_remove_scat(sfp, &sfp->reserve);
 			sg_build_reserve(sfp, val);
 		}
 		return 0;
···
 			res |= POLLOUT | POLLWRNORM;
 	} else if (count < SG_MAX_QUEUE)
 		res |= POLLOUT | POLLWRNORM;
-	SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n",
-				   sdp->disk->disk_name, (int) res));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "sg_poll: res=0x%x\n", (int) res));
 	return res;
 }
 
···
 
 	if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)))
 		return -ENXIO;
-	SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n",
-				   sdp->disk->disk_name, mode));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "sg_fasync: mode=%d\n", mode));
 
 	return fasync_helper(fd, filp, mode, &sfp->async_qp);
 }
···
 	offset = vmf->pgoff << PAGE_SHIFT;
 	if (offset >= rsv_schp->bufflen)
 		return VM_FAULT_SIGBUS;
-	SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n",
-				   offset, rsv_schp->k_use_sg));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
+				      "sg_vma_fault: offset=%lu, scatg=%d\n",
+				      offset, rsv_schp->k_use_sg));
 	sa = vma->vm_start;
 	length = 1 << (PAGE_SHIFT + rsv_schp->page_order);
 	for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) {
···
 	if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data)))
 		return -ENXIO;
 	req_sz = vma->vm_end - vma->vm_start;
-	SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n",
-				   (void *) vma->vm_start, (int) req_sz));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp,
+				      "sg_mmap starting, vm_start=%p, len=%d\n",
+				      (void *) vma->vm_start, (int) req_sz));
 	if (vma->vm_pgoff)
 		return -EINVAL;	/* want no offset */
 	rsv_schp = &sfp->reserve;
···
 	result = rq->errors;
 	resid = rq->resid_len;
 
-	SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n",
-		sdp->disk->disk_name, srp->header.pack_id, result));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp,
+				      "sg_cmd_done: pack_id=%d, res=0x%x\n",
+				      srp->header.pack_id, result));
 	srp->header.resid = resid;
 	ms = jiffies_to_msecs(jiffies);
 	srp->header.duration = (ms > srp->header.duration) ?
···
 	}
 	k = error;
 
-	SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
+	SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp,
+					"sg_alloc: dev=%d \n", k));
 	sprintf(disk->disk_name, "sg%d", k);
 	disk->first_minor = k;
 	sdp->disk = disk;
···
 	write_unlock_irqrestore(&sg_index_lock, flags);
 
 	SCSI_LOG_TIMEOUT(3,
-		printk("sg_device_destroy: %s\n",
-			sdp->disk->disk_name));
+		sg_printk(KERN_INFO, sdp, "sg_device_destroy\n"));
 
 	put_disk(sdp->disk);
 	kfree(sdp);
···
 	if (val > 1)
 		return; /* only want to do following once per device */
 
-	SCSI_LOG_TIMEOUT(3, printk("%s: %s\n", __func__,
-			 sdp->disk->disk_name));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "%s\n", __func__));
 
 	read_lock_irqsave(&sdp->sfd_lock, iflags);
 	list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) {
···
 	int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ;
 	unsigned char *long_cmdp = NULL;
 
-	SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n",
-				   dxfer_len));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+				      "sg_start_req: dxfer_len=%d\n",
+				      dxfer_len));
 
 	if (hp->cmd_len > BLK_MAX_CDB) {
 		long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL);
···
 	Sg_fd *sfp = srp->parentfp;
 	Sg_scatter_hold *req_schp = &srp->data;
 
-	SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+				      "sg_finish_rem_req: res_used=%d\n",
+				      (int) srp->res_used));
 	if (srp->rq) {
 		if (srp->bio)
 			ret = blk_rq_unmap_user(srp->bio);
···
 	if (srp->res_used)
 		sg_unlink_reserve(sfp, srp);
 	else
-		sg_remove_scat(req_schp);
+		sg_remove_scat(sfp, req_schp);
 
 	sg_remove_request(sfp, srp);
 
···
 		++blk_size;	/* don't know why */
 	/* round request up to next highest SG_SECTOR_SZ byte boundary */
 	blk_size = ALIGN(blk_size, SG_SECTOR_SZ);
-	SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n",
-				   buff_size, blk_size));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+		"sg_build_indirect: buff_size=%d, blk_size=%d\n",
+		buff_size, blk_size));
 
 	/* N.B. ret_sz carried into this block ... */
 	mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize);
···
 			}
 		}
 
-		SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, "
-				 "ret_sz=%d\n", k, num, ret_sz));
+		SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
+				 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n",
+				 k, num, ret_sz));
 	}		/* end of for loop */
 
 	schp->page_order = order;
 	schp->k_use_sg = k;
-	SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, "
-			 "rem_sz=%d\n", k, rem_sz));
+	SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp,
+			 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n",
+			 k, rem_sz));
 
 	schp->bufflen = blk_size;
 	if (rem_sz > 0)	/* must have failed */
···
 }
 
 static void
-sg_remove_scat(Sg_scatter_hold * schp)
+sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp)
 {
-	SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+			 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg));
 	if (schp->pages && schp->sglist_len > 0) {
 		if (!schp->dio_in_use) {
 			int k;
 
 			for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) {
-				SCSI_LOG_TIMEOUT(5, printk(
-				    "sg_remove_scat: k=%d, pg=0x%p\n",
-				    k, schp->pages[k]));
+				SCSI_LOG_TIMEOUT(5,
+					sg_printk(KERN_INFO, sfp->parentdp,
+					"sg_remove_scat: k=%d, pg=0x%p\n",
+					k, schp->pages[k]));
 				__free_pages(schp->pages[k], schp->page_order);
 			}
 
···
 	Sg_scatter_hold *schp = &srp->data;
 	int k, num;
 
-	SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n",
-				   num_read_xfer));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
+			 "sg_read_oxfer: num_read_xfer=%d\n",
+			 num_read_xfer));
 	if ((!outp) || (num_read_xfer <= 0))
 		return 0;
 
···
 {
 	Sg_scatter_hold *schp = &sfp->reserve;
 
-	SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+			 "sg_build_reserve: req_size=%d\n", req_size));
 	do {
 		if (req_size < PAGE_SIZE)
 			req_size = PAGE_SIZE;
 		if (0 == sg_build_indirect(schp, sfp, req_size))
 			return;
 		else
-			sg_remove_scat(schp);
+			sg_remove_scat(sfp, schp);
 		req_size >>= 1;	/* divide by 2 */
 	} while (req_size > (PAGE_SIZE / 2));
 }
···
 	int k, num, rem;
 
 	srp->res_used = 1;
-	SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp,
+			 "sg_link_reserve: size=%d\n", size));
 	rem = size;
 
 	num = 1 << (PAGE_SHIFT + rsv_schp->page_order);
···
 	}
 
 	if (k >= rsv_schp->k_use_sg)
-		SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n"));
+		SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp,
+				 "sg_link_reserve: BAD size\n"));
 }
 
 static void
···
 {
 	Sg_scatter_hold *req_schp = &srp->data;
 
-	SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n",
-				   (int) req_schp->k_use_sg));
+	SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp,
+				      "sg_unlink_reserve: req->k_use_sg=%d\n",
+				      (int) req_schp->k_use_sg));
 	req_schp->k_use_sg = 0;
 	req_schp->bufflen = 0;
 	req_schp->pages = NULL;
···
 }
 
 static Sg_fd *
-sg_add_sfp(Sg_device * sdp, int dev)
+sg_add_sfp(Sg_device * sdp)
 {
 	Sg_fd *sfp;
 	unsigned long iflags;
···
 	}
 	list_add_tail(&sfp->sfd_siblings, &sdp->sfds);
 	write_unlock_irqrestore(&sdp->sfd_lock, iflags);
-	SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "sg_add_sfp: sfp=0x%p\n", sfp));
 	if (unlikely(sg_big_buff != def_reserved_size))
 		sg_big_buff = def_reserved_size;
 
 	bufflen = min_t(int, sg_big_buff,
 			max_sectors_bytes(sdp->device->request_queue));
 	sg_build_reserve(sfp, bufflen);
-	SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp:   bufflen=%d, k_use_sg=%d\n",
-			   sfp->reserve.bufflen, sfp->reserve.k_use_sg));
+	SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,
+				      "sg_add_sfp: bufflen=%d, k_use_sg=%d\n",
+				      sfp->reserve.bufflen,
+				      sfp->reserve.k_use_sg));
 
 	kref_get(&sdp->d_ref);
 	__module_get(THIS_MODULE);
···
 		sg_finish_rem_req(sfp->headrp);
 
 	if (sfp->reserve.bufflen > 0) {
-		SCSI_LOG_TIMEOUT(6,
-			printk("sg_remove_sfp:    bufflen=%d, k_use_sg=%d\n",
+		SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
+				"sg_remove_sfp:    bufflen=%d, k_use_sg=%d\n",
 				(int) sfp->reserve.bufflen,
 				(int) sfp->reserve.k_use_sg));
-		sg_remove_scat(&sfp->reserve);
+		sg_remove_scat(sfp, &sfp->reserve);
 	}
 
-	SCSI_LOG_TIMEOUT(6,
-		printk("sg_remove_sfp: %s, sfp=0x%p\n",
-			sdp->disk->disk_name,
-			sfp));
+	SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp,
+			"sg_remove_sfp: sfp=0x%p\n", sfp));
 	kfree(sfp);
 
 	scsi_device_put(sdp->device);