blktap: Remove broken sysfs pause/resume API.
Safe to remove. This never worked on kernels > 2.6.18 anyway, because
the original pause/resume attribute flipping would deadlock. Newer
toolstacks should use tap-ctl calls instead.
Signed-off-by: Jake Wires <jake.wires@xxxxxxxxxx>
Signed-off-by: Daniel Stodden <daniel.stodden@xxxxxxxxxx>
diff -r 68eb38b6b16b -r 69301010e4cf drivers/xen/blktap/blktap.h
--- a/drivers/xen/blktap/blktap.h Wed Jun 02 19:45:25 2010 -0700
+++ b/drivers/xen/blktap/blktap.h Wed Jun 02 19:45:25 2010 -0700
@@ -31,8 +31,6 @@
#define BLKTAP_RING_FD 2
#define BLKTAP_RING_VMA 3
#define BLKTAP_DEVICE 4
-#define BLKTAP_PAUSE_REQUESTED 6
-#define BLKTAP_PAUSED 7
#define BLKTAP_SHUTDOWN_REQUESTED 8
#define BLKTAP_PASSTHROUGH 9
@@ -41,15 +39,9 @@
#define BLKTAP2_IOCTL_ALLOC_TAP 200
#define BLKTAP2_IOCTL_FREE_TAP 201
#define BLKTAP2_IOCTL_CREATE_DEVICE 202
-#define BLKTAP2_IOCTL_SET_PARAMS 203
-#define BLKTAP2_IOCTL_PAUSE 204
-#define BLKTAP2_IOCTL_REOPEN 205
-#define BLKTAP2_IOCTL_RESUME 206
#define BLKTAP2_MAX_MESSAGE_LEN 256
-#define BLKTAP2_RING_MESSAGE_PAUSE 1
-#define BLKTAP2_RING_MESSAGE_RESUME 2
#define BLKTAP2_RING_MESSAGE_CLOSE 3
#define BLKTAP_REQUEST_FREE 0
@@ -120,8 +112,6 @@
unsigned long ring_vstart;
unsigned long user_vstart;
- int response;
-
wait_queue_head_t poll_wait;
dev_t devno;
@@ -203,8 +193,6 @@
int blktap_ring_free(void);
int blktap_ring_create(struct blktap *);
int blktap_ring_destroy(struct blktap *);
-int blktap_ring_pause(struct blktap *);
-int blktap_ring_resume(struct blktap *);
void blktap_ring_kick_user(struct blktap *);
int blktap_sysfs_init(void);
@@ -216,8 +204,6 @@
void blktap_device_free(void);
int blktap_device_create(struct blktap *);
int blktap_device_destroy(struct blktap *);
-int blktap_device_pause(struct blktap *);
-int blktap_device_resume(struct blktap *);
int blktap_device_run_queue(struct blktap *);
void blktap_device_restart(struct blktap *);
void blktap_device_finish_request(struct blktap *,
diff -r 68eb38b6b16b -r 69301010e4cf drivers/xen/blktap/device.c
--- a/drivers/xen/blktap/device.c Wed Jun 02 19:45:25 2010 -0700
+++ b/drivers/xen/blktap/device.c Wed Jun 02 19:45:25 2010 -0700
@@ -923,52 +923,6 @@
}
int
-blktap_device_resume(struct blktap *tap)
-{
- int err;
-
- if (!test_bit(BLKTAP_DEVICE, &tap->dev_inuse) || !blktap_active(tap))
- return -ENODEV;
-
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return 0;
-
- err = blktap_ring_resume(tap);
- if (err)
- return err;
-
- /* device size may have changed */
- blktap_device_configure(tap);
-
- BTDBG("restarting device\n");
- blktap_device_restart(tap);
-
- return 0;
-}
-
-int
-blktap_device_pause(struct blktap *tap)
-{
- unsigned long flags;
- struct blktap_device *dev = &tap->device;
-
- if (!test_bit(BLKTAP_DEVICE, &tap->dev_inuse) || !blktap_active(tap))
- return -ENODEV;
-
- if (test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return 0;
-
- spin_lock_irqsave(&dev->lock, flags);
-
- blk_stop_queue(dev->gd->queue);
- set_bit(BLKTAP_PAUSE_REQUESTED, &tap->dev_inuse);
-
- spin_unlock_irqrestore(&dev->lock, flags);
-
- return blktap_ring_pause(tap);
-}
-
-int
blktap_device_destroy(struct blktap *tap)
{
struct blktap_device *dev = &tap->device;
diff -r 68eb38b6b16b -r 69301010e4cf drivers/xen/blktap/request.c
--- a/drivers/xen/blktap/request.c Wed Jun 02 19:45:25 2010 -0700
+++ b/drivers/xen/blktap/request.c Wed Jun 02 19:45:25 2010 -0700
@@ -238,12 +238,10 @@
list_add(&request->free_list, &pool.free_list);
atomic_dec(&handle->bucket->reqs_in_use);
free = atomic_dec_and_test(&pool.reqs_in_use);
+ tap->pending_cnt--;
spin_unlock_irqrestore(&pool.lock, flags);
- if (--tap->pending_cnt == 0)
- wake_up_interruptible(&tap->wq);
-
if (free)
wake_up(&pool.wait_queue);
}
diff -r 68eb38b6b16b -r 69301010e4cf drivers/xen/blktap/ring.c
--- a/drivers/xen/blktap/ring.c Wed Jun 02 19:45:25 2010 -0700
+++ b/drivers/xen/blktap/ring.c Wed Jun 02 19:45:25 2010 -0700
@@ -178,9 +178,6 @@
ring->vma = NULL;
clear_bit(BLKTAP_RING_VMA, &tap->dev_inuse);
- clear_bit(BLKTAP_PAUSED, &tap->dev_inuse);
- clear_bit(BLKTAP_PAUSE_REQUESTED, &tap->dev_inuse);
-
wake_up(&tap->wq);
}
@@ -381,70 +378,6 @@
tap->params = params;
return blktap_device_create(tap);
-
- case BLKTAP2_IOCTL_SET_PARAMS:
- if (!arg)
- return -EINVAL;
-
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return -EINVAL;
-
- if (copy_from_user(¶ms, (struct blktap_params __user *)arg,
- sizeof(params))) {
- BTERR("failed to get params\n");
- return -EFAULT;
- }
-
- if (blktap_validate_params(tap, ¶ms)) {
- BTERR("invalid params\n");
- return -EINVAL;
- }
-
- tap->params = params;
- return 0;
-
- case BLKTAP2_IOCTL_PAUSE:
- if (!test_bit(BLKTAP_PAUSE_REQUESTED, &tap->dev_inuse))
- return -EINVAL;
-
- set_bit(BLKTAP_PAUSED, &tap->dev_inuse);
- clear_bit(BLKTAP_PAUSE_REQUESTED, &tap->dev_inuse);
-
- blktap_ring_set_message(tap, 0);
- wake_up_interruptible(&tap->wq);
-
- return 0;
-
-
- case BLKTAP2_IOCTL_REOPEN:
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return -EINVAL;
-
- if (!arg)
- return -EINVAL;
-
- if (copy_to_user((char __user *)arg,
- tap->params.name,
- strlen(tap->params.name) + 1))
- return -EFAULT;
-
- blktap_ring_set_message(tap, 0);
- wake_up_interruptible(&tap->wq);
-
- return 0;
-
- case BLKTAP2_IOCTL_RESUME:
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return -EINVAL;
-
- tap->ring.response = (int)arg;
- if (!tap->ring.response)
- clear_bit(BLKTAP_PAUSED, &tap->dev_inuse);
-
- blktap_ring_set_message(tap, 0);
- wake_up_interruptible(&tap->wq);
-
- return 0;
}
return -ENOIOCTLCMD;
@@ -494,66 +427,6 @@
}
int
-blktap_ring_resume(struct blktap *tap)
-{
- int err;
- struct blktap_ring *ring = &tap->ring;
-
- if (!blktap_active(tap))
- return -ENODEV;
-
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return -EINVAL;
-
- /* set shared flag for resume */
- ring->response = 0;
-
- blktap_ring_set_message(tap, BLKTAP2_RING_MESSAGE_RESUME);
- blktap_ring_kick_user(tap);
-
- wait_event_interruptible(tap->wq, ring->response ||
- !test_bit(BLKTAP_PAUSED, &tap->dev_inuse));
-
- err = ring->response;
- ring->response = 0;
-
- BTDBG("err: %d\n", err);
-
- if (err)
- return err;
-
- if (test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return -EAGAIN;
-
- return 0;
-}
-
-int
-blktap_ring_pause(struct blktap *tap)
-{
- if (!blktap_active(tap))
- return -ENODEV;
-
- if (!test_bit(BLKTAP_PAUSE_REQUESTED, &tap->dev_inuse))
- return -EINVAL;
-
- BTDBG("draining queue\n");
- wait_event_interruptible(tap->wq, !tap->pending_cnt);
- if (tap->pending_cnt)
- return -EAGAIN;
-
- blktap_ring_set_message(tap, BLKTAP2_RING_MESSAGE_PAUSE);
- blktap_ring_kick_user(tap);
-
- BTDBG("waiting for tapdisk response\n");
- wait_event_interruptible(tap->wq, test_bit(BLKTAP_PAUSED,
&tap->dev_inuse));
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse))
- return -EAGAIN;
-
- return 0;
-}
-
-int
blktap_ring_destroy(struct blktap *tap)
{
if (!test_bit(BLKTAP_RING_FD, &tap->dev_inuse) &&
diff -r 68eb38b6b16b -r 69301010e4cf drivers/xen/blktap/sysfs.c
--- a/drivers/xen/blktap/sysfs.c Wed Jun 02 19:45:25 2010 -0700
+++ b/drivers/xen/blktap/sysfs.c Wed Jun 02 19:45:25 2010 -0700
@@ -38,12 +38,6 @@
}
#define CLASS_DEVICE_ATTR(a,b,c,d) DEVICE_ATTR(a,b,c,d)
-
-static ssize_t blktap_sysfs_pause_device(struct device *, struct
device_attribute *, const char *, size_t);
-CLASS_DEVICE_ATTR(pause, S_IWUSR, NULL, blktap_sysfs_pause_device);
-static ssize_t blktap_sysfs_resume_device(struct device *, struct
device_attribute *, const char *, size_t);
-CLASS_DEVICE_ATTR(resume, S_IWUSR, NULL, blktap_sysfs_resume_device);
-
static ssize_t
blktap_sysfs_set_name(struct device *dev, struct device_attribute *attr, const
char *buf, size_t size)
{
@@ -57,12 +51,6 @@
err = -ENODEV;
goto out;
}
-
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse)) {
- err = -EPERM;
- goto out;
- }
-
if (size > BLKTAP2_MAX_MESSAGE_LEN) {
err = -ENAMETOOLONG;
goto out;
@@ -123,81 +111,6 @@
}
CLASS_DEVICE_ATTR(remove, S_IWUSR, NULL, blktap_sysfs_remove_device);
-static ssize_t
-blktap_sysfs_pause_device(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t size)
-{
- int err;
- struct blktap *tap = (struct blktap *)dev_get_drvdata(dev);
-
- blktap_sysfs_enter(tap);
-
- BTDBG("pausing %u:%u: dev_inuse: %lu\n",
- MAJOR(tap->ring.devno), MINOR(tap->ring.devno), tap->dev_inuse);
-
- if (!tap->ring.dev ||
- test_bit(BLKTAP_SHUTDOWN_REQUESTED, &tap->dev_inuse)) {
- err = -ENODEV;
- goto out;
- }
-
- if (test_bit(BLKTAP_PAUSE_REQUESTED, &tap->dev_inuse)) {
- err = -EBUSY;
- goto out;
- }
-
- if (test_bit(BLKTAP_PAUSED, &tap->dev_inuse)) {
- err = 0;
- goto out;
- }
-
- err = blktap_device_pause(tap);
- if (!err) {
- device_remove_file(dev, &dev_attr_pause);
- err = device_create_file(dev, &dev_attr_resume);
- }
-
-out:
- blktap_sysfs_exit(tap);
-
- return (err ? err : size);
-}
-
-static ssize_t
-blktap_sysfs_resume_device(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t size)
-{
- int err;
- struct blktap *tap = (struct blktap *)dev_get_drvdata(dev);
-
- blktap_sysfs_enter(tap);
-
- if (!tap->ring.dev ||
- test_bit(BLKTAP_SHUTDOWN_REQUESTED, &tap->dev_inuse)) {
- err = -ENODEV;
- goto out;
- }
-
- if (!test_bit(BLKTAP_PAUSED, &tap->dev_inuse)) {
- err = -EINVAL;
- goto out;
- }
-
- err = blktap_device_resume(tap);
- if (!err) {
- device_remove_file(dev, &dev_attr_resume);
- err = device_create_file(dev, &dev_attr_pause);
- }
-
-out:
- blktap_sysfs_exit(tap);
-
- BTDBG("returning %zd\n", (err ? err : size));
- return (err ? err : size);
-}
-
#ifdef ENABLE_PASSTHROUGH
static ssize_t
blktap_sysfs_enable_passthrough(struct device *dev,
@@ -316,26 +229,18 @@
printk(KERN_CRIT "%s: adding attributes for dev %p\n", __func__, dev);
err = device_create_file(dev, &dev_attr_name);
if (err)
- goto out;
+ goto fail;
err = device_create_file(dev, &dev_attr_remove);
if (err)
- goto out_unregister_name;
- err = device_create_file(dev, &dev_attr_pause);
- if (err)
- goto out_unregister_remove;
+ goto fail;
err = device_create_file(dev, &dev_attr_debug);
if (err)
- goto out_unregister_pause;
+ goto fail;
return 0;
-out_unregister_pause:
- device_remove_file(dev, &dev_attr_pause);
-out_unregister_remove:
- device_remove_file(dev, &dev_attr_remove);
-out_unregister_name:
- device_remove_file(dev, &dev_attr_name);
-out:
+fail:
+ device_unregister(dev);
return err;
}
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