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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 4/9] xen: add basic hypervisor filesystem support
Add the infrastructure for the hypervisor filesystem.
This includes the hypercall interface and the base functions for
entry creation, deletion and modification.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
V1:
- rename files from filesystem.* to hypfs.*
- add dummy write entry support
- rename hypercall filesystem_op to hypfs_op
- add support for unsigned integer entries
V2:
- test new entry name to be valid
V3:
- major rework, especially by supporting binary contents of entries
- addressed all comments
---
xen/arch/arm/traps.c | 1 +
xen/arch/x86/hvm/hypercall.c | 1 +
xen/arch/x86/hypercall.c | 1 +
xen/arch/x86/pv/hypercall.c | 1 +
xen/common/Makefile | 1 +
xen/common/hypfs.c | 365 +++++++++++++++++++++++++++++++++++++++++++
xen/include/public/hypfs.h | 124 +++++++++++++++
xen/include/public/xen.h | 1 +
xen/include/xen/hypercall.h | 8 +
xen/include/xen/hypfs.h | 89 +++++++++++
10 files changed, 592 insertions(+)
create mode 100644 xen/common/hypfs.c
create mode 100644 xen/include/public/hypfs.h
create mode 100644 xen/include/xen/hypfs.h
diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 6f9bec22d3..87af810667 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -1382,6 +1382,7 @@ static arm_hypercall_t arm_hypercall_table[] = {
#ifdef CONFIG_ARGO
HYPERCALL(argo_op, 5),
#endif
+ HYPERCALL(hypfs_op, 5),
};
#ifndef NDEBUG
diff --git a/xen/arch/x86/hvm/hypercall.c b/xen/arch/x86/hvm/hypercall.c
index 33dd2d99d2..210dda4f38 100644
--- a/xen/arch/x86/hvm/hypercall.c
+++ b/xen/arch/x86/hvm/hypercall.c
@@ -144,6 +144,7 @@ static const hypercall_table_t hvm_hypercall_table[] = {
#endif
HYPERCALL(xenpmu_op),
COMPAT_CALL(dm_op),
+ HYPERCALL(hypfs_op),
HYPERCALL(arch_1)
};
diff --git a/xen/arch/x86/hypercall.c b/xen/arch/x86/hypercall.c
index 7f299d45c6..05a3f5e25b 100644
--- a/xen/arch/x86/hypercall.c
+++ b/xen/arch/x86/hypercall.c
@@ -73,6 +73,7 @@ const hypercall_args_t hypercall_args_table[NR_hypercalls] =
ARGS(hvm_op, 2),
ARGS(dm_op, 3),
#endif
+ ARGS(hypfs_op, 5),
ARGS(mca, 1),
ARGS(arch_1, 1),
};
diff --git a/xen/arch/x86/pv/hypercall.c b/xen/arch/x86/pv/hypercall.c
index 17ddf9ea1f..83907d4f00 100644
--- a/xen/arch/x86/pv/hypercall.c
+++ b/xen/arch/x86/pv/hypercall.c
@@ -85,6 +85,7 @@ const hypercall_table_t pv_hypercall_table[] = {
HYPERCALL(hvm_op),
COMPAT_CALL(dm_op),
#endif
+ HYPERCALL(hypfs_op),
HYPERCALL(mca),
HYPERCALL(arch_1),
};
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 62b34e69e9..a3f66aa0c0 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -11,6 +11,7 @@ obj-y += domain.o
obj-y += event_2l.o
obj-y += event_channel.o
obj-y += event_fifo.o
+obj-y += hypfs.o
obj-$(CONFIG_CRASH_DEBUG) += gdbstub.o
obj-$(CONFIG_GRANT_TABLE) += grant_table.o
obj-y += guestcopy.o
diff --git a/xen/common/hypfs.c b/xen/common/hypfs.c
new file mode 100644
index 0000000000..6762d20dfd
--- /dev/null
+++ b/xen/common/hypfs.c
@@ -0,0 +1,365 @@
+/******************************************************************************
+ *
+ * hypfs.c
+ *
+ * Simple sysfs-like file system for the hypervisor.
+ */
+
+#include <xen/lib.h>
+#include <xen/err.h>
+#include <xen/guest_access.h>
+#include <xen/hypercall.h>
+#include <xen/hypfs.h>
+#include <xen/rwlock.h>
+#include <public/hypfs.h>
+
+#define DIRENTRY_NAME_OFF offsetof(struct xen_hypfs_dirlistentry, name)
+#define DIRENTRY_SIZE(name_len) \
+ (DIRENTRY_NAME_OFF + ROUNDUP(name_len, alignof(struct xen_hypfs_direntry)))
+
+static DEFINE_RWLOCK(hypfs_lock);
+
+HYPFS_DIR_INIT(hypfs_root, "");
+
+static int add_entry(struct hypfs_entry_dir *parent, struct hypfs_entry *new)
+{
+ int ret = -ENOENT;
+ struct hypfs_entry *e;
+
+ write_lock(&hypfs_lock);
+
+ list_for_each_entry ( e, &parent->dirlist, list )
+ {
+ int cmp = strcmp(e->name, new->name);
+
+ if ( cmp > 0 )
+ {
+ ret = 0;
+ list_add_tail(&new->list, &e->list);
+ break;
+ }
+ if ( cmp == 0 )
+ {
+ ret = -EEXIST;
+ break;
+ }
+ }
+
+ if ( ret == -ENOENT )
+ {
+ ret = 0;
+ list_add_tail(&new->list, &parent->dirlist);
+ }
+
+ if ( !ret )
+ {
+ unsigned int sz = strlen(new->name) + 1;
+
+ parent->e.size += DIRENTRY_SIZE(sz);
+ }
+
+ write_unlock(&hypfs_lock);
+
+ return ret;
+}
+
+int hypfs_add_entry(struct hypfs_entry_dir *parent,
+ struct hypfs_entry *entry, bool nofault)
+{
+ int ret;
+
+ ret = add_entry(parent, entry);
+ BUG_ON(nofault && ret);
+
+ return ret;
+}
+
+int hypfs_add_dir(struct hypfs_entry_dir *parent,
+ struct hypfs_entry_dir *dir, bool nofault)
+{
+ int ret;
+
+ ret = add_entry(parent, &dir->e);
+ BUG_ON(nofault && ret);
+
+ return ret;
+}
+
+int hypfs_add_leaf(struct hypfs_entry_dir *parent,
+ struct hypfs_entry_leaf *leaf, bool nofault)
+{
+ int ret;
+
+ if ( !leaf->content )
+ ret = -EINVAL;
+ else
+ ret = add_entry(parent, &leaf->e);
+ BUG_ON(nofault && ret);
+
+ return ret;
+}
+
+static int hypfs_get_path_user(char *buf, XEN_GUEST_HANDLE_PARAM(void) uaddr,
+ unsigned long len)
+{
+ if ( len > XEN_HYPFS_MAX_PATHLEN )
+ return -EINVAL;
+
+ if ( copy_from_guest(buf, uaddr, len) )
+ return -EFAULT;
+
+ if ( buf[len - 1] )
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct hypfs_entry *hypfs_get_entry_rel(struct hypfs_entry_dir *dir,
+ const char *path)
+{
+ const char *end;
+ struct hypfs_entry *entry;
+ unsigned int name_len;
+
+ if ( !*path )
+ return &dir->e;
+
+ if ( dir->e.type != XEN_HYPFS_TYPE_DIR )
+ return NULL;
+
+ end = strchr(path, '/');
+ if ( !end )
+ end = strchr(path, '\0');
+ name_len = end - path;
+
+ list_for_each_entry ( entry, &dir->dirlist, list )
+ {
+ int cmp = strncmp(path, entry->name, name_len);
+ struct hypfs_entry_dir *d = container_of(entry,
+ struct hypfs_entry_dir, e);
+
+ if ( cmp < 0 )
+ return NULL;
+ if ( !cmp && strlen(entry->name) == name_len )
+ return *end ? hypfs_get_entry_rel(d, end + 1) : entry;
+ }
+
+ return NULL;
+}
+
+struct hypfs_entry *hypfs_get_entry(const char *path)
+{
+ if ( path[0] != '/' )
+ return NULL;
+
+ return hypfs_get_entry_rel(&hypfs_root, path + 1);
+}
+
+int hypfs_read_dir(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr)
+{
+ const struct hypfs_entry_dir *d;
+ struct hypfs_entry *e;
+ unsigned int size = entry->size;
+
+ d = container_of(entry, const struct hypfs_entry_dir, e);
+
+ list_for_each_entry ( e, &d->dirlist, list )
+ {
+ struct xen_hypfs_dirlistentry direntry;
+ unsigned int e_namelen = strlen(e->name) + 1;
+ unsigned int e_len = DIRENTRY_SIZE(e_namelen);
+
+ direntry.e.flags = e->write ? XEN_HYPFS_WRITEABLE : 0;
+ direntry.e.type = e->type;
+ direntry.e.encoding = e->encoding;
+ direntry.e.content_len = e->size;
+ direntry.off_next = list_is_last(&e->list, &d->dirlist) ? 0 : e_len;
+ if ( copy_to_guest(uaddr, &direntry, 1) )
+ return -EFAULT;
+
+ if ( copy_to_guest_offset(uaddr, DIRENTRY_NAME_OFF,
+ e->name, e_namelen) )
+ return -EFAULT;
+
+ guest_handle_add_offset(uaddr, e_len);
+
+ ASSERT(e_len <= size);
+ size -= e_len;
+ }
+
+ return 0;
+}
+
+int hypfs_read_leaf(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr)
+{
+ const struct hypfs_entry_leaf *l;
+
+ l = container_of(entry, const struct hypfs_entry_leaf, e);
+
+ return copy_to_guest(uaddr, l->content, entry->size) ? -EFAULT: 0;
+}
+
+static int hypfs_read(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen)
+{
+ struct xen_hypfs_direntry e;
+ long ret = -EINVAL;
+
+ if ( ulen < sizeof(e) )
+ goto out;
+
+ e.flags = entry->write ? XEN_HYPFS_WRITEABLE : 0;
+ e.type = entry->type;
+ e.encoding = entry->encoding;
+ e.content_len = entry->size;
+
+ ret = -EFAULT;
+ if ( copy_to_guest(uaddr, &e, 1) )
+ goto out;
+
+ ret = 0;
+ if ( ulen < entry->size + sizeof(e) )
+ goto out;
+
+ guest_handle_add_offset(uaddr, sizeof(e));
+
+ ret = entry->read(entry, uaddr);
+
+ out:
+ return ret;
+}
+
+int hypfs_write_leaf(struct hypfs_entry_leaf *leaf,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen)
+{
+ char *buf;
+ int ret;
+
+ if ( ulen > leaf->e.size )
+ ulen = leaf->e.size;
+
+ buf = xzalloc_array(char, ulen);
+ if ( !buf )
+ return -ENOMEM;
+
+ ret = -EFAULT;
+ if ( copy_from_guest(buf, uaddr, ulen) )
+ goto out;
+
+ ret = 0;
+ if ( leaf->e.type == XEN_HYPFS_TYPE_STRING )
+ buf[leaf->e.size - 1] = 0;
+ memcpy(leaf->write_ptr, buf, ulen);
+
+ out:
+ xfree(buf);
+ return ret;
+}
+
+int hypfs_write_bool(struct hypfs_entry_leaf *leaf,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen)
+{
+ union {
+ char buf[8];
+ uint8_t u8;
+ uint16_t u16;
+ uint32_t u32;
+ uint64_t u64;
+ } u;
+
+ ASSERT(leaf->e.type == XEN_HYPFS_TYPE_UINT && leaf->e.size <= 8);
+
+ if ( ulen != leaf->e.size )
+ return -EDOM;
+
+ if ( copy_from_guest(u.buf, uaddr, ulen) )
+ return -EFAULT;
+
+ switch ( leaf->e.size )
+ {
+ case 1:
+ *(uint8_t *)leaf->write_ptr = !!u.u8;
+ break;
+ case 2:
+ *(uint16_t *)leaf->write_ptr = !!u.u16;
+ break;
+ case 4:
+ *(uint32_t *)leaf->write_ptr = !!u.u32;
+ break;
+ case 8:
+ *(uint64_t *)leaf->write_ptr = !!u.u64;
+ break;
+ }
+
+ return 0;
+}
+
+static int hypfs_write(struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen)
+{
+ struct hypfs_entry_leaf *l;
+
+ if ( !entry->write )
+ return -EACCES;
+
+ l = container_of(entry, struct hypfs_entry_leaf, e);
+
+ return entry->write(l, uaddr, ulen);
+}
+
+long do_hypfs_op(unsigned int cmd,
+ XEN_GUEST_HANDLE_PARAM(void) arg1, unsigned long arg2,
+ XEN_GUEST_HANDLE_PARAM(void) arg3, unsigned long arg4)
+{
+ int ret;
+ struct hypfs_entry *entry;
+ static char path[XEN_HYPFS_MAX_PATHLEN];
+
+ if ( !is_control_domain(current->domain) &&
+ !is_hardware_domain(current->domain) )
+ return -EPERM;
+
+ if ( cmd == XEN_HYPFS_OP_get_version )
+ return XEN_HYPFS_VERSION;
+
+ if ( cmd == XEN_HYPFS_OP_write_contents )
+ write_lock(&hypfs_lock);
+ else
+ read_lock(&hypfs_lock);
+
+ ret = hypfs_get_path_user(path, arg1, arg2);
+ if ( ret )
+ goto out;
+
+ entry = hypfs_get_entry(path);
+ if ( !entry )
+ {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ switch ( cmd )
+ {
+ case XEN_HYPFS_OP_read_contents:
+ ret = hypfs_read(entry, arg3, arg4);
+ break;
+
+ case XEN_HYPFS_OP_write_contents:
+ ret = hypfs_write(entry, arg3, arg4);
+ break;
+
+ default:
+ ret = -ENOSYS;
+ break;
+ }
+
+ out:
+ if ( cmd == XEN_HYPFS_OP_write_contents )
+ write_unlock(&hypfs_lock);
+ else
+ read_unlock(&hypfs_lock);
+
+ return ret;
+}
diff --git a/xen/include/public/hypfs.h b/xen/include/public/hypfs.h
new file mode 100644
index 0000000000..8351511227
--- /dev/null
+++ b/xen/include/public/hypfs.h
@@ -0,0 +1,124 @@
+/******************************************************************************
+ * Xen Hypervisor Filesystem
+ *
+ * Copyright (c) 2019, SUSE Software Solutions Germany GmbH
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __XEN_PUBLIC_HYPFS_H__
+#define __XEN_PUBLIC_HYPFS_H__
+
+#include "xen.h"
+
+/*
+ * Definitions for the __HYPERVISOR_hypfs_op hypercall.
+ */
+
+/* Highest version number of the hypfs interface currently defined. */
+#define XEN_HYPFS_VERSION 1
+
+/* Maximum length of a path in the filesystem. */
+#define XEN_HYPFS_MAX_PATHLEN 1024
+
+struct xen_hypfs_direntry {
+ uint16_t flags;
+#define XEN_HYPFS_WRITEABLE 0x0001
+ uint8_t type;
+#define XEN_HYPFS_TYPE_DIR 0x0000
+#define XEN_HYPFS_TYPE_BLOB 0x0001
+#define XEN_HYPFS_TYPE_STRING 0x0002
+#define XEN_HYPFS_TYPE_UINT 0x0003
+#define XEN_HYPFS_TYPE_INT 0x0004
+#define XEN_HYPFS_TYPE_BOOL 0x0005
+ uint8_t encoding;
+#define XEN_HYPFS_ENC_PLAIN 0x0000
+#define XEN_HYPFS_ENC_GZIP 0x0001
+ uint32_t content_len;
+};
+
+struct xen_hypfs_dirlistentry {
+ struct xen_hypfs_direntry e;
+ /* Offset in bytes to next entry (0 == this is the last entry). */
+ uint16_t off_next;
+ char name[XEN_FLEX_ARRAY_DIM];
+};
+
+/*
+ * Hypercall operations.
+ */
+
+/*
+ * XEN_HYPFS_OP_get_version
+ *
+ * Read highest interface version supported by the hypervisor.
+ *
+ * Possible return values:
+ * >0: highest supported interface version
+ * <0: negative Xen errno value
+ */
+#define XEN_HYPFS_OP_get_version 0
+
+/*
+ * XEN_HYPFS_OP_read_contents
+ *
+ * Read contents of a filesystem entry.
+ *
+ * Returns the direntry and contents of an entry in the buffer supplied by the
+ * caller (struct xen_hypfs_direntry with the contents following directly
+ * after it).
+ * The data buffer must be at least the size of the direntry returned in order
+ * to have success. If the data buffer was not large enough for all the data
+ * no entry data is returned, but the direntry will contain the needed size
+ * for the returned data.
+ * The format of the contents is according to its entry type and encoding.
+ *
+ * arg1: XEN_GUEST_HANDLE(path name)
+ * arg2: length of path name (including trailing zero byte)
+ * arg3: XEN_GUEST_HANDLE(data buffer written by hypervisor)
+ * arg4: data buffer size
+ *
+ * Possible return values:
+ * 0: success (at least the direntry was returned)
+ * <0 : negative Xen errno value
+ */
+#define XEN_HYPFS_OP_read_contents 1
+
+/*
+ * XEN_HYPFS_OP_write_contents
+ *
+ * Write contents of a filesystem entry.
+ *
+ * Writes an entry with the contents of a buffer supplied by the caller.
+ * The data type and encoding can't be changed. The size can be changed only
+ * for blobs and strings.
+ *
+ * arg1: XEN_GUEST_HANDLE(path name)
+ * arg2: length of path name (including trailing zero byte)
+ * arg3: XEN_GUEST_HANDLE(content buffer read by hypervisor)
+ * arg4: content buffer size
+ *
+ * Possible return values:
+ * 0: success
+ * <0 : negative Xen errno value
+ */
+#define XEN_HYPFS_OP_write_contents 2
+
+#endif /* __XEN_PUBLIC_HYPFS_H__ */
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index d2198dffad..bf80f1da8c 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -130,6 +130,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
#define __HYPERVISOR_argo_op 39
#define __HYPERVISOR_xenpmu_op 40
#define __HYPERVISOR_dm_op 41
+#define __HYPERVISOR_hypfs_op 42
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48
diff --git a/xen/include/xen/hypercall.h b/xen/include/xen/hypercall.h
index ad8ad27b23..349a0f6487 100644
--- a/xen/include/xen/hypercall.h
+++ b/xen/include/xen/hypercall.h
@@ -150,6 +150,14 @@ do_dm_op(
unsigned int nr_bufs,
XEN_GUEST_HANDLE_PARAM(xen_dm_op_buf_t) bufs);
+extern long
+do_hypfs_op(
+ unsigned int cmd,
+ XEN_GUEST_HANDLE_PARAM(void) arg1,
+ unsigned long arg2,
+ XEN_GUEST_HANDLE_PARAM(void) arg3,
+ unsigned long arg4);
+
#ifdef CONFIG_COMPAT
extern int
diff --git a/xen/include/xen/hypfs.h b/xen/include/xen/hypfs.h
new file mode 100644
index 0000000000..a1c2140398
--- /dev/null
+++ b/xen/include/xen/hypfs.h
@@ -0,0 +1,89 @@
+#ifndef __XEN_HYPFS_H__
+#define __XEN_HYPFS_H__
+
+#include <xen/list.h>
+#include <xen/string.h>
+#include <public/hypfs.h>
+
+struct hypfs_entry_leaf;
+
+struct hypfs_entry {
+ unsigned short type;
+ unsigned short encoding;
+ unsigned int size;
+ const char *name;
+ struct list_head list;
+ int (*read)(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr);
+ int (*write)(struct hypfs_entry_leaf *leaf,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen);
+};
+
+struct hypfs_entry_leaf {
+ struct hypfs_entry e;
+ union {
+ const void *content;
+ void *write_ptr;
+ };
+};
+
+struct hypfs_entry_dir {
+ struct hypfs_entry e;
+ struct list_head dirlist;
+};
+
+#define HYPFS_DIR_INIT(var, nam) \
+ struct hypfs_entry_dir var = { \
+ .e.type = XEN_HYPFS_TYPE_DIR, \
+ .e.encoding = XEN_HYPFS_ENC_PLAIN, \
+ .e.name = nam, \
+ .e.size = 0, \
+ .e.list = LIST_HEAD_INIT(var.e.list), \
+ .e.read = hypfs_read_dir, \
+ .dirlist = LIST_HEAD_INIT(var.dirlist), \
+ }
+
+/* Content and size need to be set via hypfs_string_set(). */
+#define HYPFS_STRING_INIT(var, nam) \
+ struct hypfs_entry_leaf var = { \
+ .e.type = XEN_HYPFS_TYPE_STRING, \
+ .e.encoding = XEN_HYPFS_ENC_PLAIN, \
+ .e.name = nam, \
+ .e.read = hypfs_read_leaf, \
+ }
+
+static inline void hypfs_string_set(struct hypfs_entry_leaf *leaf,
+ const char *str)
+{
+ leaf->content = str;
+ leaf->e.size = strlen(str) + 1;
+}
+
+#define HYPFS_UINT_INIT(var, nam, uint) \
+ struct hypfs_entry_leaf var = { \
+ .e.type = XEN_HYPFS_TYPE_UINT, \
+ .e.encoding = XEN_HYPFS_ENC_PLAIN, \
+ .e.name = nam, \
+ .e.size = sizeof(uint), \
+ .e.read = hypfs_read_leaf, \
+ .content = &uint, \
+ }
+
+
+extern struct hypfs_entry_dir hypfs_root;
+
+struct hypfs_entry *hypfs_get_entry(const char *path);
+int hypfs_add_dir(struct hypfs_entry_dir *parent,
+ struct hypfs_entry_dir *dir, bool nofault);
+int hypfs_add_leaf(struct hypfs_entry_dir *parent,
+ struct hypfs_entry_leaf *leaf, bool nofault);
+int hypfs_read_dir(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr);
+int hypfs_read_leaf(const struct hypfs_entry *entry,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr);
+int hypfs_write_leaf(struct hypfs_entry_leaf *leaf,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen);
+int hypfs_write_bool(struct hypfs_entry_leaf *leaf,
+ XEN_GUEST_HANDLE_PARAM(void) uaddr, unsigned long ulen);
+
+#endif /* __XEN_HYPFS_H__ */
--
2.16.4
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