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authorIan Campbell <ian.campbell@citrix.com>2009-02-06 18:46:48 -0800
committerJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>2010-10-20 16:22:26 -0700
commit655d406a7c80bffc03263d071b6ba1e0fcf548f9 (patch)
treed3cbe97860bff0d347111ff293b6f5b3124bf67e /drivers/xen
parentcd07202cc8262e1669edff0d97715f3dd9260917 (diff)
xen: add /proc/xen/xsd_{kva,port} to xenfs
These are used by the userspace xenstore daemon, which runs in dom0. Xenstored is what's behind the xenfs "xenbus" filesystem. [ Impact: provide mapping and port to usermode for xenstore ] Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/xenfs/Makefile3
-rw-r--r--drivers/xen/xenfs/super.c54
-rw-r--r--drivers/xen/xenfs/xenfs.h2
-rw-r--r--drivers/xen/xenfs/xenstored.c68
4 files changed, 125 insertions, 2 deletions
diff --git a/drivers/xen/xenfs/Makefile b/drivers/xen/xenfs/Makefile
index 25275c3bbdf..5d45ff13cc0 100644
--- a/drivers/xen/xenfs/Makefile
+++ b/drivers/xen/xenfs/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_XENFS) += xenfs.o
-xenfs-objs = super.o xenbus.o \ No newline at end of file
+xenfs-y = super.o xenbus.o
+xenfs-$(CONFIG_XEN_DOM0) += xenstored.o
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 78bfab0700b..3cf7707217f 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -22,6 +22,46 @@
MODULE_DESCRIPTION("Xen filesystem");
MODULE_LICENSE("GPL");
+static struct inode *xenfs_make_inode(struct super_block *sb, int mode)
+{
+ struct inode *ret = new_inode(sb);
+
+ if (ret) {
+ ret->i_mode = mode;
+ ret->i_uid = ret->i_gid = 0;
+ ret->i_blocks = 0;
+ ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
+ }
+ return ret;
+}
+
+static struct dentry *xenfs_create_file(struct super_block *sb,
+ struct dentry *parent,
+ const char *name,
+ const struct file_operations *fops,
+ void *data,
+ int mode)
+{
+ struct dentry *dentry;
+ struct inode *inode;
+
+ dentry = d_alloc_name(parent, name);
+ if (!dentry)
+ return NULL;
+
+ inode = xenfs_make_inode(sb, S_IFREG | mode);
+ if (!inode) {
+ dput(dentry);
+ return NULL;
+ }
+
+ inode->i_fop = fops;
+ inode->i_private = data;
+
+ d_add(dentry, inode);
+ return dentry;
+}
+
static ssize_t capabilities_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
@@ -45,8 +85,20 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
{ "capabilities", &capabilities_file_ops, S_IRUGO },
{""},
};
+ int rc;
+
+ rc = simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
+ if (rc < 0)
+ return rc;
+
+ if (xen_initial_domain()) {
+ xenfs_create_file(sb, sb->s_root, "xsd_kva",
+ &xsd_kva_file_ops, NULL, S_IRUSR|S_IWUSR);
+ xenfs_create_file(sb, sb->s_root, "xsd_port",
+ &xsd_port_file_ops, NULL, S_IRUSR|S_IWUSR);
+ }
- return simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
+ return rc;
}
static int xenfs_get_sb(struct file_system_type *fs_type,
diff --git a/drivers/xen/xenfs/xenfs.h b/drivers/xen/xenfs/xenfs.h
index 51f08b2d0bf..5056306e7aa 100644
--- a/drivers/xen/xenfs/xenfs.h
+++ b/drivers/xen/xenfs/xenfs.h
@@ -2,5 +2,7 @@
#define _XENFS_XENBUS_H
extern const struct file_operations xenbus_file_ops;
+extern const struct file_operations xsd_kva_file_ops;
+extern const struct file_operations xsd_port_file_ops;
#endif /* _XENFS_XENBUS_H */
diff --git a/drivers/xen/xenfs/xenstored.c b/drivers/xen/xenfs/xenstored.c
new file mode 100644
index 00000000000..fef20dbc6a5
--- /dev/null
+++ b/drivers/xen/xenfs/xenstored.c
@@ -0,0 +1,68 @@
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+
+#include <xen/page.h>
+
+#include "xenfs.h"
+#include "../xenbus/xenbus_comms.h"
+
+static ssize_t xsd_read(struct file *file, char __user *buf,
+ size_t size, loff_t *off)
+{
+ const char *str = (const char *)file->private_data;
+ return simple_read_from_buffer(buf, size, off, str, strlen(str));
+}
+
+static int xsd_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
+static int xsd_kva_open(struct inode *inode, struct file *file)
+{
+ file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p",
+ xen_store_interface);
+ if (!file->private_data)
+ return -ENOMEM;
+ return 0;
+}
+
+static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ size_t size = vma->vm_end - vma->vm_start;
+
+ if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0))
+ return -EINVAL;
+
+ if (remap_pfn_range(vma, vma->vm_start,
+ virt_to_pfn(xen_store_interface),
+ size, vma->vm_page_prot))
+ return -EAGAIN;
+
+ return 0;
+}
+
+const struct file_operations xsd_kva_file_ops = {
+ .open = xsd_kva_open,
+ .mmap = xsd_kva_mmap,
+ .read = xsd_read,
+ .release = xsd_release,
+};
+
+static int xsd_port_open(struct inode *inode, struct file *file)
+{
+ file->private_data = (void *)kasprintf(GFP_KERNEL, "%d",
+ xen_store_evtchn);
+ if (!file->private_data)
+ return -ENOMEM;
+ return 0;
+}
+
+const struct file_operations xsd_port_file_ops = {
+ .open = xsd_port_open,
+ .read = xsd_read,
+ .release = xsd_release,
+};