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>
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@ -1,3 +1,4 @@
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obj-$(CONFIG_XENFS) += xenfs.o
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xenfs-objs = super.o xenbus.o
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xenfs-y = super.o xenbus.o
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xenfs-$(CONFIG_XEN_DOM0) += xenstored.o
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@ -22,6 +22,46 @@
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MODULE_DESCRIPTION("Xen filesystem");
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MODULE_LICENSE("GPL");
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static struct inode *xenfs_make_inode(struct super_block *sb, int mode)
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{
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struct inode *ret = new_inode(sb);
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if (ret) {
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ret->i_mode = mode;
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ret->i_uid = ret->i_gid = 0;
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ret->i_blocks = 0;
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ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
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}
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return ret;
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}
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static struct dentry *xenfs_create_file(struct super_block *sb,
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struct dentry *parent,
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const char *name,
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const struct file_operations *fops,
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void *data,
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int mode)
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{
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struct dentry *dentry;
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struct inode *inode;
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dentry = d_alloc_name(parent, name);
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if (!dentry)
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return NULL;
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inode = xenfs_make_inode(sb, S_IFREG | mode);
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if (!inode) {
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dput(dentry);
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return NULL;
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}
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inode->i_fop = fops;
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inode->i_private = data;
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d_add(dentry, inode);
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return dentry;
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}
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static ssize_t capabilities_read(struct file *file, char __user *buf,
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size_t size, loff_t *off)
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{
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@ -45,8 +85,20 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
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{ "capabilities", &capabilities_file_ops, S_IRUGO },
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{""},
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};
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int rc;
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return simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
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rc = simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
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if (rc < 0)
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return rc;
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if (xen_initial_domain()) {
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xenfs_create_file(sb, sb->s_root, "xsd_kva",
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&xsd_kva_file_ops, NULL, S_IRUSR|S_IWUSR);
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xenfs_create_file(sb, sb->s_root, "xsd_port",
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&xsd_port_file_ops, NULL, S_IRUSR|S_IWUSR);
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}
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return rc;
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}
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static int xenfs_get_sb(struct file_system_type *fs_type,
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@ -2,5 +2,7 @@
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#define _XENFS_XENBUS_H
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extern const struct file_operations xenbus_file_ops;
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extern const struct file_operations xsd_kva_file_ops;
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extern const struct file_operations xsd_port_file_ops;
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#endif /* _XENFS_XENBUS_H */
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68
drivers/xen/xenfs/xenstored.c
Normal file
68
drivers/xen/xenfs/xenstored.c
Normal file
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@ -0,0 +1,68 @@
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <xen/page.h>
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#include "xenfs.h"
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#include "../xenbus/xenbus_comms.h"
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static ssize_t xsd_read(struct file *file, char __user *buf,
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size_t size, loff_t *off)
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{
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const char *str = (const char *)file->private_data;
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return simple_read_from_buffer(buf, size, off, str, strlen(str));
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}
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static int xsd_release(struct inode *inode, struct file *file)
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{
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kfree(file->private_data);
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return 0;
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}
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static int xsd_kva_open(struct inode *inode, struct file *file)
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{
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file->private_data = (void *)kasprintf(GFP_KERNEL, "0x%p",
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xen_store_interface);
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if (!file->private_data)
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return -ENOMEM;
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return 0;
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}
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static int xsd_kva_mmap(struct file *file, struct vm_area_struct *vma)
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{
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size_t size = vma->vm_end - vma->vm_start;
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if ((size > PAGE_SIZE) || (vma->vm_pgoff != 0))
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return -EINVAL;
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if (remap_pfn_range(vma, vma->vm_start,
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virt_to_pfn(xen_store_interface),
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size, vma->vm_page_prot))
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return -EAGAIN;
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return 0;
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}
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const struct file_operations xsd_kva_file_ops = {
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.open = xsd_kva_open,
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.mmap = xsd_kva_mmap,
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.read = xsd_read,
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.release = xsd_release,
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};
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static int xsd_port_open(struct inode *inode, struct file *file)
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{
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file->private_data = (void *)kasprintf(GFP_KERNEL, "%d",
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xen_store_evtchn);
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if (!file->private_data)
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return -ENOMEM;
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return 0;
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}
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const struct file_operations xsd_port_file_ops = {
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.open = xsd_port_open,
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.read = xsd_read,
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.release = xsd_release,
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};
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