Displaying 6 results from an estimated 6 matches for "xenbus_dev_write".
2006 Aug 02
2
[PATCH][RFC] permit domU userspace to watch xenstore
...tok_len;
+
+ hdr.type = XS_WATCH_EVENT;
+ hdr.len = body_len;
+
+ queue_reply(adap->dev_data, (char *)&hdr, sizeof(hdr));
+ queue_reply(adap->dev_data, (char *)path, path_len);
+ queue_reply(adap->dev_data, (char *)token, tok_len);
+}
+
+static LIST_HEAD(watch_list);
static ssize_t xenbus_dev_write(struct file *filp,
const char __user *ubuf,
@@ -116,6 +167,9 @@ static ssize_t xenbus_dev_write(struct f
struct xenbus_dev_transaction *trans = NULL;
uint32_t msg_type;
void *reply;
+ char *path, *token;
+ struct watch_adapter *watch, *tmp_watch;
+ int err;
if ((len + u->len) >...
2011 May 26
0
concurrent writes to xenbus device
Is it supposed to be possible to write to the same struct file instance
from multiple threads/processes? Looking at xenbus_dev_write() I
can''t see how such writes would be serialized, yet assuming that user
mode code always writes full messages it would seem consistent to
allow such.
Thanks, Jan
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2012 Jan 24
0
[PATCH] linux-2.6.18/xenbus_dev: add missing error checks to watch handling
...ch token was merely assumed to be.
Additionally, none of the three associated memory allocations got
checked for being successful.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/drivers/xen/xenbus/xenbus_dev.c
+++ b/drivers/xen/xenbus/xenbus_dev.c
@@ -269,18 +269,24 @@ static ssize_t xenbus_dev_write(struct f
goto out;
}
token++;
+ if (memchr(token, 0, u->u.msg.len - (token - path)) == NULL) {
+ rc = -EILSEQ;
+ goto out;
+ }
if (msg_type == XS_WATCH) {
watch = kzalloc(sizeof(*watch), GFP_KERNEL);
- watch->watch.node = kmalloc(strlen(path)+1,
-...
2005 Dec 15
10
watches not working from domU userspace
...erspace (they
obviously do for drivers).
In some preliminary debugging of this, there are two aspects of the
failure: not sending the watch to xenstore and not handling watch
events for userspace watches. The former can be easily fixed by adding
the missing ''case XS_WATCH:'' to xenbus_dev_write() in xenbus_dev.c.
The latter is more difficult to fix. So before I tackle it, I wanted to
see if anyone else was already working on a solution or just had some
thoughts to share on possible solutions.
Joseph Cihula
(Linux) Software Security Architect
Open Source Technology Center
Intel Corp.
**...
2007 Mar 05
0
[PATCH 3/10] linux 2.6.18: constify instances of ''struct file_operations''
...drivers/xen/xenbus/xenbus_dev.c 2007-02-27 16:27:37.000000000 +0100
@@ -342,7 +342,7 @@ static unsigned int xenbus_dev_poll(stru
return 0;
}
-static struct file_operations xenbus_dev_file_ops = {
+static const struct file_operations xenbus_dev_file_ops = {
.read = xenbus_dev_read,
.write = xenbus_dev_write,
.open = xenbus_dev_open,
Index: head-2007-02-27/../patches/linux-2.6.18/blktap-aio-16_03_06.patch
===================================================================
--- head-2007-02-27.orig/../patches/linux-2.6.18/blktap-aio-16_03_06.patch
+++ head-2007-02-27/../patches/linux-2.6.18/blktap-aio-...
2005 Sep 08
45
/proc/xen/xenbus supports watch?
Hi,
Anybody (Christian?) could please tell me if we can get the support
for registering watch with /proc/xen/xenbus? (..OK, I know that we
will change it this /proc stuff to a device soon)
So far we can only do read/write/rm. I really miss the xen watch feature.
Many thanks,
Hieu
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