#include <linux/interrupt.h>
#include <linux/blkdev.h>
+#include <linux/hdreg.h>
+#include <linux/cdrom.h>
#include <linux/module.h>
+#include <linux/scatterlist.h>
+#include <xen/xen.h>
#include <xen/xenbus.h>
#include <xen/grant_table.h>
#include <xen/events.h>
#include <xen/interface/grant_table.h>
#include <xen/interface/io/blkif.h>
+#include <xen/interface/io/protocols.h>
#include <asm/xen/hypervisor.h>
unsigned long frame[BLKIF_MAX_SEGMENTS_PER_REQUEST];
};
-static struct block_device_operations xlvbd_block_fops;
+static const struct block_device_operations xlvbd_block_fops;
#define BLK_RING_SIZE __RING_SIZE((struct blkif_sring *)0, PAGE_SIZE)
struct blkfront_info
{
struct xenbus_device *xbdev;
- dev_t dev;
struct gendisk *gd;
int vdevice;
blkif_vdev_t handle;
enum blkif_state connected;
int ring_ref;
struct blkif_front_ring ring;
+ struct scatterlist sg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
unsigned int evtchn, irq;
struct request_queue *rq;
struct work_struct work;
struct blk_shadow shadow[BLK_RING_SIZE];
unsigned long shadow_free;
int feature_barrier;
+ int is_ready;
/**
* The number of people holding this device open. We won't allow a
#define GRANT_INVALID_REF 0
#define PARTS_PER_DISK 16
+#define PARTS_PER_EXT_DISK 256
#define BLKIF_MAJOR(dev) ((dev)>>8)
#define BLKIF_MINOR(dev) ((dev) & 0xff)
-#define DEV_NAME "xvd" /* name in /dev */
+#define EXT_SHIFT 28
+#define EXTENDED (1<<EXT_SHIFT)
+#define VDEV_IS_EXTENDED(dev) ((dev)&(EXTENDED))
+#define BLKIF_MINOR_EXT(dev) ((dev)&(~EXTENDED))
-/* Information about our VBDs. */
-#define MAX_VBDS 64
-static LIST_HEAD(vbds_list);
+#define DEV_NAME "xvd" /* name in /dev */
static int get_id_from_freelist(struct blkfront_info *info)
{
unsigned long free = info->shadow_free;
- BUG_ON(free > BLK_RING_SIZE);
+ BUG_ON(free >= BLK_RING_SIZE);
info->shadow_free = info->shadow[free].req.id;
info->shadow[free].req.id = 0x0fffffee; /* debug */
return free;
schedule_work(&info->work);
}
+static int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)
+{
+ /* We don't have real geometry info, but let's at least return
+ values consistent with the size of the device */
+ sector_t nsect = get_capacity(bd->bd_disk);
+ sector_t cylinders = nsect;
+
+ hg->heads = 0xff;
+ hg->sectors = 0x3f;
+ sector_div(cylinders, hg->heads * hg->sectors);
+ hg->cylinders = cylinders;
+ if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)
+ hg->cylinders = 0xffff;
+ return 0;
+}
+
+static int blkif_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned command, unsigned long argument)
+{
+ struct blkfront_info *info = bdev->bd_disk->private_data;
+ int i;
+
+ dev_dbg(&info->xbdev->dev, "command: 0x%x, argument: 0x%lx\n",
+ command, (long)argument);
+
+ switch (command) {
+ case CDROMMULTISESSION:
+ dev_dbg(&info->xbdev->dev, "FIXME: support multisession CDs later\n");
+ for (i = 0; i < sizeof(struct cdrom_multisession); i++)
+ if (put_user(0, (char __user *)(argument + i)))
+ return -EFAULT;
+ return 0;
+
+ case CDROM_GET_CAPABILITY: {
+ struct gendisk *gd = info->gd;
+ if (gd->flags & GENHD_FL_CD)
+ return 0;
+ return -EINVAL;
+ }
+
+ default:
+ /*printk(KERN_ALERT "ioctl %08x not supported by Xen blkdev\n",
+ command);*/
+ return -EINVAL; /* same return as native Linux */
+ }
+
+ return 0;
+}
+
/*
* blkif_queue_request
*
struct blkfront_info *info = req->rq_disk->private_data;
unsigned long buffer_mfn;
struct blkif_request *ring_req;
- struct bio *bio;
- struct bio_vec *bvec;
- int idx;
unsigned long id;
unsigned int fsect, lsect;
- int ref;
+ int i, ref;
grant_ref_t gref_head;
+ struct scatterlist *sg;
if (unlikely(info->connected != BLKIF_STATE_CONNECTED))
return 1;
info->shadow[id].request = (unsigned long)req;
ring_req->id = id;
- ring_req->sector_number = (blkif_sector_t)req->sector;
+ ring_req->sector_number = (blkif_sector_t)blk_rq_pos(req);
ring_req->handle = info->handle;
ring_req->operation = rq_data_dir(req) ?
if (blk_barrier_rq(req))
ring_req->operation = BLKIF_OP_WRITE_BARRIER;
- ring_req->nr_segments = 0;
- rq_for_each_bio (bio, req) {
- bio_for_each_segment (bvec, bio, idx) {
- BUG_ON(ring_req->nr_segments
- == BLKIF_MAX_SEGMENTS_PER_REQUEST);
- buffer_mfn = pfn_to_mfn(page_to_pfn(bvec->bv_page));
- fsect = bvec->bv_offset >> 9;
- lsect = fsect + (bvec->bv_len >> 9) - 1;
- /* install a grant reference. */
- ref = gnttab_claim_grant_reference(&gref_head);
- BUG_ON(ref == -ENOSPC);
+ ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg);
+ BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST);
- gnttab_grant_foreign_access_ref(
+ for_each_sg(info->sg, sg, ring_req->nr_segments, i) {
+ buffer_mfn = pfn_to_mfn(page_to_pfn(sg_page(sg)));
+ fsect = sg->offset >> 9;
+ lsect = fsect + (sg->length >> 9) - 1;
+ /* install a grant reference. */
+ ref = gnttab_claim_grant_reference(&gref_head);
+ BUG_ON(ref == -ENOSPC);
+
+ gnttab_grant_foreign_access_ref(
ref,
info->xbdev->otherend_id,
buffer_mfn,
rq_data_dir(req) );
- info->shadow[id].frame[ring_req->nr_segments] =
- mfn_to_pfn(buffer_mfn);
-
- ring_req->seg[ring_req->nr_segments] =
+ info->shadow[id].frame[i] = mfn_to_pfn(buffer_mfn);
+ ring_req->seg[i] =
(struct blkif_request_segment) {
.gref = ref,
.first_sect = fsect,
.last_sect = lsect };
-
- ring_req->nr_segments++;
- }
}
info->ring.req_prod_pvt++;
* do_blkif_request
* read a block; request is in a request queue
*/
-static void do_blkif_request(request_queue_t *rq)
+static void do_blkif_request(struct request_queue *rq)
{
struct blkfront_info *info = NULL;
struct request *req;
queued = 0;
- while ((req = elv_next_request(rq)) != NULL) {
+ while ((req = blk_peek_request(rq)) != NULL) {
info = req->rq_disk->private_data;
- if (!blk_fs_request(req)) {
- end_request(req, 0);
- continue;
- }
if (RING_FULL(&info->ring))
goto wait;
- pr_debug("do_blk_req %p: cmd %p, sec %lx, "
- "(%u/%li) buffer:%p [%s]\n",
- req, req->cmd, (unsigned long)req->sector,
- req->current_nr_sectors,
- req->nr_sectors, req->buffer,
- rq_data_dir(req) ? "write" : "read");
+ blk_start_request(req);
+
+ if (!blk_fs_request(req)) {
+ __blk_end_request_all(req, -EIO);
+ continue;
+ }
+ pr_debug("do_blk_req %p: cmd %p, sec %lx, "
+ "(%u/%u) buffer:%p [%s]\n",
+ req, req->cmd, (unsigned long)blk_rq_pos(req),
+ blk_rq_cur_sectors(req), blk_rq_sectors(req),
+ req->buffer, rq_data_dir(req) ? "write" : "read");
- blkdev_dequeue_request(req);
if (blkif_queue_request(req)) {
blk_requeue_request(rq, req);
wait:
static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size)
{
- request_queue_t *rq;
+ struct request_queue *rq;
rq = blk_init_queue(do_blkif_request, &blkif_io_lock);
if (rq == NULL)
return -1;
- elevator_init(rq, "noop");
+ queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq);
/* Hard sector size and max sectors impersonate the equiv. hardware. */
- blk_queue_hardsect_size(rq, sector_size);
+ blk_queue_logical_block_size(rq, sector_size);
blk_queue_max_sectors(rq, 512);
/* Each segment in a request is up to an aligned page in size. */
/* Make sure buffer addresses are sector-aligned. */
blk_queue_dma_alignment(rq, 511);
+ /* Make sure we don't use bounce buffers. */
+ blk_queue_bounce_limit(rq, BLK_BOUNCE_ANY);
+
gd->queue = rq;
return 0;
}
-static int xlvbd_alloc_gendisk(int minor, blkif_sector_t capacity,
- int vdevice, u16 vdisk_info, u16 sector_size,
- struct blkfront_info *info)
+static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
+ struct blkfront_info *info,
+ u16 vdisk_info, u16 sector_size)
{
struct gendisk *gd;
int nr_minors = 1;
int err = -ENODEV;
+ unsigned int offset;
+ int minor;
+ int nr_parts;
BUG_ON(info->gd != NULL);
BUG_ON(info->rq != NULL);
- if ((minor % PARTS_PER_DISK) == 0)
- nr_minors = PARTS_PER_DISK;
+ if ((info->vdevice>>EXT_SHIFT) > 1) {
+ /* this is above the extended range; something is wrong */
+ printk(KERN_WARNING "blkfront: vdevice 0x%x is above the extended range; ignoring\n", info->vdevice);
+ return -ENODEV;
+ }
+
+ if (!VDEV_IS_EXTENDED(info->vdevice)) {
+ minor = BLKIF_MINOR(info->vdevice);
+ nr_parts = PARTS_PER_DISK;
+ } else {
+ minor = BLKIF_MINOR_EXT(info->vdevice);
+ nr_parts = PARTS_PER_EXT_DISK;
+ }
+
+ if ((minor % nr_parts) == 0)
+ nr_minors = nr_parts;
gd = alloc_disk(nr_minors);
if (gd == NULL)
goto out;
- if (nr_minors > 1)
- sprintf(gd->disk_name, "%s%c", DEV_NAME,
- 'a' + minor / PARTS_PER_DISK);
- else
- sprintf(gd->disk_name, "%s%c%d", DEV_NAME,
- 'a' + minor / PARTS_PER_DISK,
- minor % PARTS_PER_DISK);
+ offset = minor / nr_parts;
+
+ if (nr_minors > 1) {
+ if (offset < 26)
+ sprintf(gd->disk_name, "%s%c", DEV_NAME, 'a' + offset);
+ else
+ sprintf(gd->disk_name, "%s%c%c", DEV_NAME,
+ 'a' + ((offset / 26)-1), 'a' + (offset % 26));
+ } else {
+ if (offset < 26)
+ sprintf(gd->disk_name, "%s%c%d", DEV_NAME,
+ 'a' + offset,
+ minor & (nr_parts - 1));
+ else
+ sprintf(gd->disk_name, "%s%c%c%d", DEV_NAME,
+ 'a' + ((offset / 26) - 1),
+ 'a' + (offset % 26),
+ minor & (nr_parts - 1));
+ }
gd->major = XENVBD_MAJOR;
gd->first_minor = minor;
RING_IDX i, rp;
unsigned long flags;
struct blkfront_info *info = (struct blkfront_info *)dev_id;
- int uptodate;
+ int error;
spin_lock_irqsave(&blkif_io_lock, flags);
for (i = info->ring.rsp_cons; i != rp; i++) {
unsigned long id;
- int ret;
bret = RING_GET_RESPONSE(&info->ring, i);
id = bret->id;
add_id_to_freelist(info, id);
- uptodate = (bret->status == BLKIF_RSP_OKAY);
+ error = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO;
switch (bret->operation) {
case BLKIF_OP_WRITE_BARRIER:
if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
printk(KERN_WARNING "blkfront: %s: write barrier op failed\n",
info->gd->disk_name);
- uptodate = -EOPNOTSUPP;
+ error = -EOPNOTSUPP;
info->feature_barrier = 0;
xlvbd_barrier(info);
}
dev_dbg(&info->xbdev->dev, "Bad return from blkdev data "
"request: %x\n", bret->status);
- ret = end_that_request_first(req, uptodate,
- req->hard_nr_sectors);
- BUG_ON(ret);
- end_that_request_last(req, uptodate);
+ __blk_end_request_all(req, error);
break;
default:
BUG();
info->ring_ref = GRANT_INVALID_REF;
- sring = (struct blkif_sring *)__get_free_page(GFP_KERNEL);
+ sring = (struct blkif_sring *)__get_free_page(GFP_NOIO | __GFP_HIGH);
if (!sring) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating shared ring");
return -ENOMEM;
SHARED_RING_INIT(sring);
FRONT_RING_INIT(&info->ring, sring, PAGE_SIZE);
+ sg_init_table(info->sg, BLKIF_MAX_SEGMENTS_PER_REQUEST);
+
err = xenbus_grant_ring(dev, virt_to_mfn(info->ring.sring));
if (err < 0) {
free_page((unsigned long)sring);
message = "writing event-channel";
goto abort_transaction;
}
+ err = xenbus_printf(xbt, dev->nodename, "protocol", "%s",
+ XEN_IO_PROTO_ABI_NATIVE);
+ if (err) {
+ message = "writing protocol";
+ goto abort_transaction;
+ }
err = xenbus_transaction_end(xbt, 0);
if (err) {
err = xenbus_scanf(XBT_NIL, dev->nodename,
"virtual-device", "%i", &vdevice);
if (err != 1) {
- xenbus_dev_fatal(dev, err, "reading virtual-device");
- return err;
+ /* go looking in the extended area instead */
+ err = xenbus_scanf(XBT_NIL, dev->nodename, "virtual-device-ext",
+ "%i", &vdevice);
+ if (err != 1) {
+ xenbus_dev_fatal(dev, err, "reading virtual-device");
+ return err;
+ }
}
info = kzalloc(sizeof(*info), GFP_KERNEL);
/* Front end dir is a number, which is used as the id. */
info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0);
- dev->dev.driver_data = info;
+ dev_set_drvdata(&dev->dev, info);
err = talk_to_backend(dev, info);
if (err) {
kfree(info);
- dev->dev.driver_data = NULL;
+ dev_set_drvdata(&dev->dev, NULL);
return err;
}
int j;
/* Stage 1: Make a safe copy of the shadow state. */
- copy = kmalloc(sizeof(info->shadow), GFP_KERNEL);
+ copy = kmalloc(sizeof(info->shadow),
+ GFP_NOIO | __GFP_REPEAT | __GFP_HIGH);
if (!copy)
return -ENOMEM;
memcpy(copy, info->shadow, sizeof(info->shadow));
*/
static int blkfront_resume(struct xenbus_device *dev)
{
- struct blkfront_info *info = dev->dev.driver_data;
+ struct blkfront_info *info = dev_get_drvdata(&dev->dev);
int err;
dev_dbg(&dev->dev, "blkfront_resume: %s\n", dev->nodename);
if (err)
info->feature_barrier = 0;
- err = xlvbd_alloc_gendisk(BLKIF_MINOR(info->vdevice),
- sectors, info->vdevice,
- binfo, sector_size, info);
+ err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
if (err) {
xenbus_dev_fatal(info->xbdev, err, "xlvbd_add at %s",
info->xbdev->otherend);
spin_unlock_irq(&blkif_io_lock);
add_disk(info->gd);
+
+ info->is_ready = 1;
}
/**
*/
static void blkfront_closing(struct xenbus_device *dev)
{
- struct blkfront_info *info = dev->dev.driver_data;
+ struct blkfront_info *info = dev_get_drvdata(&dev->dev);
unsigned long flags;
dev_dbg(&dev->dev, "blkfront_closing: %s removed\n", dev->nodename);
spin_lock_irqsave(&blkif_io_lock, flags);
- del_gendisk(info->gd);
-
/* No more blkif_request(). */
blk_stop_queue(info->rq);
blk_cleanup_queue(info->rq);
info->rq = NULL;
+ del_gendisk(info->gd);
+
out:
xenbus_frontend_closed(dev);
}
static void backend_changed(struct xenbus_device *dev,
enum xenbus_state backend_state)
{
- struct blkfront_info *info = dev->dev.driver_data;
+ struct blkfront_info *info = dev_get_drvdata(&dev->dev);
struct block_device *bd;
dev_dbg(&dev->dev, "blkfront:backend_changed.\n");
break;
case XenbusStateClosing:
- bd = bdget(info->dev);
+ if (info->gd == NULL) {
+ xenbus_frontend_closed(dev);
+ break;
+ }
+ bd = bdget_disk(info->gd, 0);
if (bd == NULL)
xenbus_dev_fatal(dev, -ENODEV, "bdget failed");
static int blkfront_remove(struct xenbus_device *dev)
{
- struct blkfront_info *info = dev->dev.driver_data;
+ struct blkfront_info *info = dev_get_drvdata(&dev->dev);
dev_dbg(&dev->dev, "blkfront_remove: %s removed\n", dev->nodename);
return 0;
}
-static int blkif_open(struct inode *inode, struct file *filep)
+static int blkfront_is_ready(struct xenbus_device *dev)
+{
+ struct blkfront_info *info = dev_get_drvdata(&dev->dev);
+
+ return info->is_ready;
+}
+
+static int blkif_open(struct block_device *bdev, fmode_t mode)
{
- struct blkfront_info *info = inode->i_bdev->bd_disk->private_data;
+ struct blkfront_info *info = bdev->bd_disk->private_data;
info->users++;
return 0;
}
-static int blkif_release(struct inode *inode, struct file *filep)
+static int blkif_release(struct gendisk *disk, fmode_t mode)
{
- struct blkfront_info *info = inode->i_bdev->bd_disk->private_data;
+ struct blkfront_info *info = disk->private_data;
info->users--;
if (info->users == 0) {
/* Check whether we have been instructed to close. We will
struct xenbus_device *dev = info->xbdev;
enum xenbus_state state = xenbus_read_driver_state(dev->otherend);
- if (state == XenbusStateClosing)
+ if (state == XenbusStateClosing && info->is_ready)
blkfront_closing(dev);
}
return 0;
}
-static struct block_device_operations xlvbd_block_fops =
+static const struct block_device_operations xlvbd_block_fops =
{
.owner = THIS_MODULE,
.open = blkif_open,
.release = blkif_release,
+ .getgeo = blkif_getgeo,
+ .locked_ioctl = blkif_ioctl,
};
.remove = blkfront_remove,
.resume = blkfront_resume,
.otherend_changed = backend_changed,
+ .is_ready = blkfront_is_ready,
};
static int __init xlblk_init(void)
{
- if (!is_running_on_xen())
+ if (!xen_domain())
return -ENODEV;
if (register_blkdev(XENVBD_MAJOR, DEV_NAME)) {
module_init(xlblk_init);
-static void xlblk_exit(void)
+static void __exit xlblk_exit(void)
{
return xenbus_unregister_driver(&blkfront);
}
MODULE_DESCRIPTION("Xen virtual block device frontend");
MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(XENVBD_MAJOR);
+MODULE_ALIAS("xen:vbd");
+MODULE_ALIAS("xenblk");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff