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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2345771f87
Convert the xenfs filesystem to the new internal mount API as the old one will be obsoleted and removed. This allows greater flexibility in communication of mount parameters between userspace, the VFS and the filesystem. See Documentation/filesystems/mount_api.txt for more information. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Juergen Gross <jgross@suse.com> cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> cc: Stefano Stabellini <sstabellini@kernel.org> cc: xen-devel@lists.xenproject.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*
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* xenfs.c - a filesystem for passing info between the a domain and
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* the hypervisor.
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*
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* 2008-10-07 Alex Zeffertt Replaced /proc/xen/xenbus with xenfs filesystem
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* and /proc/xen compatibility mount point.
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* Turned xenfs into a loadable module.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/fs_context.h>
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#include <linux/magic.h>
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#include <xen/xen.h>
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#include <xen/xenbus.h>
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#include "xenfs.h"
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#include "../privcmd.h"
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#include <asm/xen/hypervisor.h>
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MODULE_DESCRIPTION("Xen filesystem");
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MODULE_LICENSE("GPL");
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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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char *tmp = "";
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if (xen_initial_domain())
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tmp = "control_d\n";
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return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp));
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}
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static const struct file_operations capabilities_file_ops = {
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.read = capabilities_read,
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.llseek = default_llseek,
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};
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static int xenfs_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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static const struct tree_descr xenfs_files[] = {
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[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
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{ "capabilities", &capabilities_file_ops, S_IRUGO },
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{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
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{""},
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};
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static const struct tree_descr xenfs_init_files[] = {
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[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
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{ "capabilities", &capabilities_file_ops, S_IRUGO },
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{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
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{ "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR},
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{ "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR},
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#ifdef CONFIG_XEN_SYMS
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{ "xensyms", &xensyms_ops, S_IRUSR},
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#endif
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{""},
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};
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return simple_fill_super(sb, XENFS_SUPER_MAGIC,
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xen_initial_domain() ? xenfs_init_files : xenfs_files);
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}
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static int xenfs_get_tree(struct fs_context *fc)
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{
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return get_tree_single(fc, xenfs_fill_super);
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}
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static const struct fs_context_operations xenfs_context_ops = {
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.get_tree = xenfs_get_tree,
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};
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static int xenfs_init_fs_context(struct fs_context *fc)
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{
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fc->ops = &xenfs_context_ops;
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return 0;
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}
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static struct file_system_type xenfs_type = {
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.owner = THIS_MODULE,
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.name = "xenfs",
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.init_fs_context = xenfs_init_fs_context,
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.kill_sb = kill_litter_super,
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};
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MODULE_ALIAS_FS("xenfs");
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static int __init xenfs_init(void)
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{
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if (xen_domain())
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return register_filesystem(&xenfs_type);
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return 0;
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}
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static void __exit xenfs_exit(void)
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{
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if (xen_domain())
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unregister_filesystem(&xenfs_type);
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}
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module_init(xenfs_init);
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module_exit(xenfs_exit);
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