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qubes-linux-kernel/patches.xen/xen-blkfront-cdrom

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Keeps patches unpacked for easier history browsing
2010-07-07 11:12:45 +00:00
From: plc@novell.com
Subject: implement forwarding of CD-ROM specific commands
Patch-mainline: obsolete
References: fate#300964
--- head-2010-04-15.orig/drivers/cdrom/Makefile 2010-04-28 15:44:04.000000000 +0200
+++ head-2010-04-15/drivers/cdrom/Makefile 2010-03-25 14:38:07.000000000 +0100
@@ -9,6 +9,7 @@ obj-$(CONFIG_BLK_DEV_IDECD) +=
obj-$(CONFIG_BLK_DEV_SR) += cdrom.o
obj-$(CONFIG_PARIDE_PCD) += cdrom.o
obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o
+obj-$(CONFIG_XEN_BLKDEV_FRONTEND) += cdrom.o
obj-$(CONFIG_VIOCD) += viocd.o cdrom.o
obj-$(CONFIG_GDROM) += gdrom.o cdrom.o
--- head-2010-04-15.orig/drivers/xen/blkfront/Makefile 2007-06-12 13:13:44.000000000 +0200
+++ head-2010-04-15/drivers/xen/blkfront/Makefile 2010-03-25 14:38:07.000000000 +0100
@@ -1,5 +1,5 @@
obj-$(CONFIG_XEN_BLKDEV_FRONTEND) := xenblk.o
-xenblk-objs := blkfront.o vbd.o
+xenblk-objs := blkfront.o vbd.o vcd.o
--- head-2010-04-15.orig/drivers/xen/blkfront/blkfront.c 2010-03-25 14:38:05.000000000 +0100
+++ head-2010-04-15/drivers/xen/blkfront/blkfront.c 2010-03-25 14:38:07.000000000 +0100
@@ -395,6 +395,8 @@ static void connect(struct blkfront_info
add_disk(info->gd);
info->is_ready = 1;
+
+ register_vcd(info);
}
/**
@@ -424,6 +426,8 @@ static void blkfront_closing(struct blkf
xlvbd_sysfs_delif(info);
+ unregister_vcd(info);
+
xlvbd_del(info);
out:
--- head-2010-04-15.orig/drivers/xen/blkfront/block.h 2010-03-24 15:14:47.000000000 +0100
+++ head-2010-04-15/drivers/xen/blkfront/block.h 2010-03-25 14:38:07.000000000 +0100
@@ -163,4 +163,8 @@ static inline void xlvbd_sysfs_delif(str
}
#endif
+/* Virtual cdrom block-device */
+extern void register_vcd(struct blkfront_info *info);
+extern void unregister_vcd(struct blkfront_info *info);
+
#endif /* __XEN_DRIVERS_BLOCK_H__ */
--- head-2010-04-15.orig/drivers/xen/blkfront/vbd.c 2010-03-25 16:41:12.000000000 +0100
+++ head-2010-04-15/drivers/xen/blkfront/vbd.c 2010-03-25 14:38:07.000000000 +0100
@@ -369,7 +369,8 @@ xlvbd_add(blkif_sector_t capacity, int v
goto out;
info->mi = mi;
- if ((minor & ((1 << mi->type->partn_shift) - 1)) == 0)
+ if (!(vdisk_info & VDISK_CDROM) &&
+ (minor & ((1 << mi->type->partn_shift) - 1)) == 0)
nr_minors = 1 << mi->type->partn_shift;
err = xlbd_reserve_minors(mi, minor, nr_minors);
@@ -383,7 +384,7 @@ xlvbd_add(blkif_sector_t capacity, int v
offset = mi->index * mi->type->disks_per_major +
(minor >> mi->type->partn_shift);
- if (nr_minors > 1) {
+ if (nr_minors > 1 || (vdisk_info & VDISK_CDROM)) {
if (offset < 26) {
sprintf(gd->disk_name, "%s%c",
mi->type->diskname, 'a' + offset );
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ head-2010-04-15/drivers/xen/blkfront/vcd.c 2010-04-28 16:17:50.000000000 +0200
@@ -0,0 +1,505 @@
+/*******************************************************************************
+ * vcd.c
+ *
+ * Implements CDROM cmd packet passing between frontend guest and backend driver.
+ *
+ * Copyright (c) 2008, Pat Campell plc@novell.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#define REVISION "$Revision: 1.0 $"
+
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/list.h>
+#include <linux/cdrom.h>
+#include <xen/interface/io/cdromif.h>
+#include "block.h"
+
+/* List of cdrom_device_info, can have as many as blkfront supports */
+struct vcd_disk {
+ struct list_head vcd_entry;
+ struct cdrom_device_info vcd_cdrom_info;
+ spinlock_t vcd_cdrom_info_lock;
+};
+static LIST_HEAD(vcd_disks);
+static DEFINE_SPINLOCK(vcd_disks_lock);
+
+static struct vcd_disk *xencdrom_get_list_entry(struct gendisk *disk)
+{
+ struct vcd_disk *ret_vcd = NULL;
+ struct vcd_disk *vcd;
+
+ spin_lock(&vcd_disks_lock);
+ list_for_each_entry(vcd, &vcd_disks, vcd_entry) {
+ if (vcd->vcd_cdrom_info.disk == disk) {
+ spin_lock(&vcd->vcd_cdrom_info_lock);
+ ret_vcd = vcd;
+ break;
+ }
+ }
+ spin_unlock(&vcd_disks_lock);
+ return ret_vcd;
+}
+
+static void submit_message(struct blkfront_info *info, void *sp)
+{
+ struct request *req = NULL;
+
+ req = blk_get_request(info->rq, READ, __GFP_WAIT);
+ if (blk_rq_map_kern(info->rq, req, sp, PAGE_SIZE, __GFP_WAIT))
+ goto out;
+
+ req->rq_disk = info->gd;
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
+ req->cmd_type = REQ_TYPE_BLOCK_PC;
+ req->cmd_flags |= REQ_NOMERGE;
+#else
+ req->flags |= REQ_BLOCK_PC;
+#endif
+ req->__sector = 0;
+ req->__data_len = PAGE_SIZE;
+ req->timeout = 60*HZ;
+
+ blk_execute_rq(req->q, info->gd, req, 1);
+
+out:
+ blk_put_request(req);
+}
+
+static int submit_cdrom_cmd(struct blkfront_info *info,
+ struct packet_command *cgc)
+{
+ int ret = 0;
+ struct page *page;
+ size_t size;
+ union xen_block_packet *sp;
+ struct xen_cdrom_packet *xcp;
+ struct vcd_generic_command *vgc;
+
+ if (cgc->buffer && cgc->buflen > MAX_PACKET_DATA) {
+ printk(KERN_WARNING "%s() Packet buffer length is to large \n", __func__);
+ return -EIO;
+ }
+
+ page = alloc_page(GFP_NOIO|__GFP_ZERO);
+ if (!page) {
+ printk(KERN_CRIT "%s() Unable to allocate page\n", __func__);
+ return -ENOMEM;
+ }
+
+ size = PAGE_SIZE;
+ sp = page_address(page);
+ xcp = &(sp->xcp);
+ xcp->type = XEN_TYPE_CDROM_PACKET;
+ xcp->payload_offset = PACKET_PAYLOAD_OFFSET;
+
+ vgc = (struct vcd_generic_command *)((char *)sp + xcp->payload_offset);
+ memcpy(vgc->cmd, cgc->cmd, CDROM_PACKET_SIZE);
+ vgc->stat = cgc->stat;
+ vgc->data_direction = cgc->data_direction;
+ vgc->quiet = cgc->quiet;
+ vgc->timeout = cgc->timeout;
+ if (cgc->sense) {
+ vgc->sense_offset = PACKET_SENSE_OFFSET;
+ memcpy((char *)sp + vgc->sense_offset, cgc->sense, sizeof(struct request_sense));
+ }
+ if (cgc->buffer) {
+ vgc->buffer_offset = PACKET_BUFFER_OFFSET;
+ memcpy((char *)sp + vgc->buffer_offset, cgc->buffer, cgc->buflen);
+ vgc->buflen = cgc->buflen;
+ }
+
+ submit_message(info,sp);
+
+ if (xcp->ret)
+ ret = xcp->err;
+
+ if (cgc->sense) {
+ memcpy(cgc->sense, (char *)sp + PACKET_SENSE_OFFSET, sizeof(struct request_sense));
+ }
+ if (cgc->buffer && cgc->buflen) {
+ memcpy(cgc->buffer, (char *)sp + PACKET_BUFFER_OFFSET, cgc->buflen);
+ }
+
+ __free_page(page);
+ return ret;
+}
+
+
+static int xencdrom_open(struct cdrom_device_info *cdi, int purpose)
+{
+ int ret = 0;
+ struct page *page;
+ struct blkfront_info *info;
+ union xen_block_packet *sp;
+ struct xen_cdrom_open *xco;
+
+ info = cdi->disk->private_data;
+
+ if (!info->xbdev)
+ return -ENODEV;
+
+ if (strlen(info->xbdev->otherend) > MAX_PACKET_DATA) {
+ return -EIO;
+ }
+
+ page = alloc_page(GFP_NOIO|__GFP_ZERO);
+ if (!page) {
+ printk(KERN_CRIT "%s() Unable to allocate page\n", __func__);
+ return -ENOMEM;
+ }
+
+ sp = page_address(page);
+ xco = &(sp->xco);
+ xco->type = XEN_TYPE_CDROM_OPEN;
+ xco->payload_offset = sizeof(struct xen_cdrom_open);
+ strcpy((char *)sp + xco->payload_offset, info->xbdev->otherend);
+
+ submit_message(info,sp);
+
+ if (xco->ret) {
+ ret = xco->err;
+ goto out;
+ }
+
+ if (xco->media_present)
+ set_capacity(cdi->disk, xco->sectors);
+
+out:
+ __free_page(page);
+ return ret;
+}
+
+static void xencdrom_release(struct cdrom_device_info *cdi)
+{
+}
+
+static int xencdrom_media_changed(struct cdrom_device_info *cdi, int disc_nr)
+{
+ int ret;
+ struct page *page;
+ struct blkfront_info *info;
+ union xen_block_packet *sp;
+ struct xen_cdrom_media_changed *xcmc;
+
+ info = cdi->disk->private_data;
+
+ page = alloc_page(GFP_NOIO|__GFP_ZERO);
+ if (!page) {
+ printk(KERN_CRIT "%s() Unable to allocate page\n", __func__);
+ return -ENOMEM;
+ }
+
+ sp = page_address(page);
+ xcmc = &(sp->xcmc);
+ xcmc->type = XEN_TYPE_CDROM_MEDIA_CHANGED;
+ submit_message(info,sp);
+ ret = xcmc->media_changed;
+
+ __free_page(page);
+
+ return ret;
+}
+
+static int xencdrom_tray_move(struct cdrom_device_info *cdi, int position)
+{
+ int ret;
+ struct packet_command cgc;
+ struct blkfront_info *info;
+
+ info = cdi->disk->private_data;
+ init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+ cgc.cmd[0] = GPCMD_START_STOP_UNIT;
+ if (position)
+ cgc.cmd[4] = 2;
+ else
+ cgc.cmd[4] = 3;
+ ret = submit_cdrom_cmd(info, &cgc);
+ return ret;
+}
+
+static int xencdrom_lock_door(struct cdrom_device_info *cdi, int lock)
+{
+ int ret = 0;
+ struct blkfront_info *info;
+ struct packet_command cgc;
+
+ info = cdi->disk->private_data;
+ init_cdrom_command(&cgc, NULL, 0, CGC_DATA_NONE);
+ cgc.cmd[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
+ cgc.cmd[4] = lock;
+ ret = submit_cdrom_cmd(info, &cgc);
+ return ret;
+}
+
+static int xencdrom_packet(struct cdrom_device_info *cdi,
+ struct packet_command *cgc)
+{
+ int ret = -EIO;
+ struct blkfront_info *info;
+
+ info = cdi->disk->private_data;
+ ret = submit_cdrom_cmd(info, cgc);
+ cgc->stat = ret;
+ return ret;
+}
+
+static int xencdrom_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
+ void *arg)
+{
+ return -EINVAL;
+}
+
+/* Query backend to see if CDROM packets are supported */
+static int xencdrom_supported(struct blkfront_info *info)
+{
+ struct page *page;
+ union xen_block_packet *sp;
+ struct xen_cdrom_support *xcs;
+
+ page = alloc_page(GFP_NOIO|__GFP_ZERO);
+ if (!page) {
+ printk(KERN_CRIT "%s() Unable to allocate page\n", __func__);
+ return -ENOMEM;
+ }
+
+ sp = page_address(page);
+ xcs = &(sp->xcs);
+ xcs->type = XEN_TYPE_CDROM_SUPPORT;
+ submit_message(info,sp);
+ return xcs->supported;
+}
+
+static struct cdrom_device_ops xencdrom_dops = {
+ .open = xencdrom_open,
+ .release = xencdrom_release,
+ .media_changed = xencdrom_media_changed,
+ .tray_move = xencdrom_tray_move,
+ .lock_door = xencdrom_lock_door,
+ .generic_packet = xencdrom_packet,
+ .audio_ioctl = xencdrom_audio_ioctl,
+ .capability = (CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | \
+ CDC_MEDIA_CHANGED | CDC_GENERIC_PACKET | CDC_DVD | \
+ CDC_CD_R),
+ .n_minors = 1,
+};
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+static int xencdrom_block_open(struct inode *inode, struct file *file)
+{
+ struct block_device *bd = inode->i_bdev;
+#else
+static int xencdrom_block_open(struct block_device *bd, fmode_t mode)
+{
+#endif
+ struct blkfront_info *info = bd->bd_disk->private_data;
+ struct vcd_disk *vcd;
+ int ret = 0;
+
+ if (!info->xbdev)
+ return -ENODEV;
+
+ if ((vcd = xencdrom_get_list_entry(info->gd))) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+ ret = cdrom_open(&vcd->vcd_cdrom_info, inode, file);
+#else
+ ret = cdrom_open(&vcd->vcd_cdrom_info, bd, mode);
+#endif
+ info->users = vcd->vcd_cdrom_info.use_count;
+ spin_unlock(&vcd->vcd_cdrom_info_lock);
+ }
+ return ret;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+static int xencdrom_block_release(struct inode *inode, struct file *file)
+{
+ struct gendisk *gd = inode->i_bdev->bd_disk;
+#else
+static int xencdrom_block_release(struct gendisk *gd, fmode_t mode)
+{
+#endif
+ struct blkfront_info *info = gd->private_data;
+ struct vcd_disk *vcd;
+ int ret = 0;
+
+ if ((vcd = xencdrom_get_list_entry(info->gd))) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+ ret = cdrom_release(&vcd->vcd_cdrom_info, file);
+#else
+ cdrom_release(&vcd->vcd_cdrom_info, mode);
+#endif
+ spin_unlock(&vcd->vcd_cdrom_info_lock);
+ if (vcd->vcd_cdrom_info.use_count == 0) {
+ info->users = 1;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+ blkif_release(inode, file);
+#else
+ blkif_release(gd, mode);
+#endif
+ }
+ }
+ return ret;
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
+static int xencdrom_block_ioctl(struct inode *inode, struct file *file,
+ unsigned cmd, unsigned long arg)
+{
+ struct block_device *bd = inode->i_bdev;
+#else
+static int xencdrom_block_ioctl(struct block_device *bd, fmode_t mode,
+ unsigned cmd, unsigned long arg)
+{
+#endif
+ struct blkfront_info *info = bd->bd_disk->private_data;
+ struct vcd_disk *vcd;
+ int ret = 0;
+
+ if (!(vcd = xencdrom_get_list_entry(info->gd)))
+ goto out;
+
+ switch (cmd) {
+ case 2285: /* SG_IO */
+ ret = -ENOSYS;
+ break;
+ case CDROMEJECT:
+ ret = xencdrom_tray_move(&vcd->vcd_cdrom_info, 1);
+ break;
+ case CDROMCLOSETRAY:
+ ret = xencdrom_tray_move(&vcd->vcd_cdrom_info, 0);
+ break;
+ case CDROM_GET_CAPABILITY:
+ ret = vcd->vcd_cdrom_info.ops->capability & ~vcd->vcd_cdrom_info.mask;
+ break;
+ case CDROM_SET_OPTIONS:
+ ret = vcd->vcd_cdrom_info.options;
+ break;
+ case CDROM_SEND_PACKET:
+ ret = submit_cdrom_cmd(info, (struct packet_command *)arg);
+ break;
+ default:
+ /* Not supported, augment supported above if necessary */
+ printk("%s():%d Unsupported IOCTL:%x \n", __func__, __LINE__, cmd);
+ ret = -ENOTTY;
+ break;
+ }
+ spin_unlock(&vcd->vcd_cdrom_info_lock);
+out:
+ return ret;
+}
+
+/* Called as result of cdrom_open, vcd_cdrom_info_lock already held */
+static int xencdrom_block_media_changed(struct gendisk *disk)
+{
+ struct vcd_disk *vcd;
+ struct vcd_disk *ret_vcd = NULL;
+ int ret = 0;
+
+ spin_lock(&vcd_disks_lock);
+ list_for_each_entry(vcd, &vcd_disks, vcd_entry) {
+ if (vcd->vcd_cdrom_info.disk == disk) {
+ ret_vcd = vcd;
+ break;
+ }
+ }
+ spin_unlock(&vcd_disks_lock);
+ if (ret_vcd) {
+ ret = cdrom_media_changed(&ret_vcd->vcd_cdrom_info);
+ }
+ return ret;
+}
+
+static const struct block_device_operations xencdrom_bdops =
+{
+ .owner = THIS_MODULE,
+ .open = xencdrom_block_open,
+ .release = xencdrom_block_release,
+ .ioctl = xencdrom_block_ioctl,
+ .media_changed = xencdrom_block_media_changed,
+};
+
+void register_vcd(struct blkfront_info *info)
+{
+ struct gendisk *gd = info->gd;
+ struct vcd_disk *vcd;
+
+ /* Make sure this is for a CD device */
+ if (!(gd->flags & GENHD_FL_CD))
+ goto out;
+
+ /* Make sure we have backend support */
+ if (!xencdrom_supported(info)) {
+ goto out;
+ }
+
+ /* Create new vcd_disk and fill in cdrom_info */
+ vcd = (struct vcd_disk *)kzalloc(sizeof(struct vcd_disk), GFP_KERNEL);
+ if (!vcd) {
+ printk(KERN_INFO "%s(): Unable to allocate vcd struct!\n", __func__);
+ goto out;
+ }
+ spin_lock_init(&vcd->vcd_cdrom_info_lock);
+
+ vcd->vcd_cdrom_info.ops = &xencdrom_dops;
+ vcd->vcd_cdrom_info.speed = 4;
+ vcd->vcd_cdrom_info.capacity = 1;
+ vcd->vcd_cdrom_info.options = 0;
+ strcpy(vcd->vcd_cdrom_info.name, gd->disk_name);
+ vcd->vcd_cdrom_info.mask = (CDC_CD_RW | CDC_DVD_R | CDC_DVD_RAM |
+ CDC_SELECT_DISC | CDC_SELECT_SPEED |
+ CDC_MRW | CDC_MRW_W | CDC_RAM);
+
+ if (register_cdrom(&(vcd->vcd_cdrom_info)) != 0) {
+ printk(KERN_WARNING "%s() Cannot register blkdev as a cdrom %d!\n", __func__,
+ gd->major);
+ goto err_out;
+ }
+ gd->fops = &xencdrom_bdops;
+ vcd->vcd_cdrom_info.disk = gd;
+
+ spin_lock(&vcd_disks_lock);
+ list_add(&(vcd->vcd_entry), &vcd_disks);
+ spin_unlock(&vcd_disks_lock);
+out:
+ return;
+err_out:
+ kfree(vcd);
+}
+
+void unregister_vcd(struct blkfront_info *info) {
+ struct gendisk *gd = info->gd;
+ struct vcd_disk *vcd;
+
+ spin_lock(&vcd_disks_lock);
+ list_for_each_entry(vcd, &vcd_disks, vcd_entry) {
+ if (vcd->vcd_cdrom_info.disk == gd) {
+ spin_lock(&vcd->vcd_cdrom_info_lock);
+ unregister_cdrom(&vcd->vcd_cdrom_info);
+ list_del(&vcd->vcd_entry);
+ spin_unlock(&vcd->vcd_cdrom_info_lock);
+ kfree(vcd);
+ break;
+ }
+ }
+ spin_unlock(&vcd_disks_lock);
+}
+
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ head-2010-04-15/include/xen/interface/io/cdromif.h 2010-03-25 14:38:07.000000000 +0100
@@ -0,0 +1,120 @@
+/******************************************************************************
+ * cdromif.h
+ *
+ * Shared definitions between backend driver and Xen guest Virtual CDROM
+ * block device.
+ *
+ * Copyright (c) 2008, Pat Campell plc@novell.com
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef __XEN_PUBLIC_IO_CDROMIF_H__
+#define __XEN_PUBLIC_IO_CDROMIF_H__
+
+/*
+ * Queries backend for CDROM support
+ */
+#define XEN_TYPE_CDROM_SUPPORT _IO('c', 1)
+
+struct xen_cdrom_support
+{
+ uint32_t type;
+ int8_t ret; /* returned, 0 succeded, -1 error */
+ int8_t err; /* returned, backend errno */
+ int8_t supported; /* returned, 1 supported */
+};
+
+/*
+ * Opens backend device, returns drive geometry or
+ * any encountered errors
+ */
+#define XEN_TYPE_CDROM_OPEN _IO('c', 2)
+
+struct xen_cdrom_open
+{
+ uint32_t type;
+ int8_t ret;
+ int8_t err;
+ int8_t pad;
+ int8_t media_present; /* returned */
+ uint32_t sectors; /* returned */
+ uint32_t sector_size; /* returned */
+ int32_t payload_offset; /* offset to backend node name payload */
+};
+
+/*
+ * Queries backend for media changed status
+ */
+#define XEN_TYPE_CDROM_MEDIA_CHANGED _IO('c', 3)
+
+struct xen_cdrom_media_changed
+{
+ uint32_t type;
+ int8_t ret;
+ int8_t err;
+ int8_t media_changed; /* returned */
+};
+
+/*
+ * Sends vcd generic CDROM packet to backend, followed
+ * immediately by the vcd_generic_command payload
+ */
+#define XEN_TYPE_CDROM_PACKET _IO('c', 4)
+
+struct xen_cdrom_packet
+{
+ uint32_t type;
+ int8_t ret;
+ int8_t err;
+ int8_t pad[2];
+ int32_t payload_offset; /* offset to vcd_generic_command payload */
+};
+
+/* CDROM_PACKET_COMMAND, payload for XEN_TYPE_CDROM_PACKET */
+struct vcd_generic_command
+{
+ uint8_t cmd[CDROM_PACKET_SIZE];
+ uint8_t pad[4];
+ uint32_t buffer_offset;
+ uint32_t buflen;
+ int32_t stat;
+ uint32_t sense_offset;
+ uint8_t data_direction;
+ uint8_t pad1[3];
+ int32_t quiet;
+ int32_t timeout;
+};
+
+union xen_block_packet
+{
+ uint32_t type;
+ struct xen_cdrom_support xcs;
+ struct xen_cdrom_open xco;
+ struct xen_cdrom_media_changed xcmc;
+ struct xen_cdrom_packet xcp;
+};
+
+#define PACKET_PAYLOAD_OFFSET (sizeof(struct xen_cdrom_packet))
+#define PACKET_SENSE_OFFSET (PACKET_PAYLOAD_OFFSET + sizeof(struct vcd_generic_command))
+#define PACKET_BUFFER_OFFSET (PACKET_SENSE_OFFSET + sizeof(struct request_sense))
+#define MAX_PACKET_DATA (PAGE_SIZE - sizeof(struct xen_cdrom_packet) - \
+ sizeof(struct vcd_generic_command) - sizeof(struct request_sense))
+
+#endif
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