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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Minios-devel] [UNIKRAFT PATCH] lib/vfscore: introduce vfscore
The initial implementation of the vfs abstraction layer. The task of
the library is to allocate file descriptors, and redirect generic
calls to the responsible library.
At this point only 3 basic calls are redirected: close(), read() and
write().
A target library (e.g. lwip) needs to provide an actual implementation
of the functions, by setting pointers in struct vfscore_fops. For
example:
struct lwip_file {
struct vfscore_file vfscore_file;
int private_fd;
};
int socket(int domain, int type, int protocol)
{
struct lwip_file *file;
int ret = vfscore_alloc_fd();
file = uk_malloc(uk_alloc_get_default(), sizeof(*file));
file->vfscore_file.fops = &lwip_fops;
file->private_fd = lwip_socket(blah, blah, blah);
vfscore_install_fd(ret, &file->vfscore_file);
}
If user calls 'write', vfscore will resolve corresponding struct
vfscore_file and will pass it to the registered (in the fops) write
function. The latter could get it's wrapper struct via __containerof()
Signed-off-by: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
---
lib/Makefile.uk | 1 +
lib/nolibc/include/unistd.h | 51 +++++++++++++++
lib/vfscore/Makefile.uk | 6 ++
lib/vfscore/export.syms | 6 ++
lib/vfscore/fd.c | 99 ++++++++++++++++++++++++++++++
lib/vfscore/file.c | 94 ++++++++++++++++++++++++++++
lib/vfscore/include/vfscore/file.h | 58 +++++++++++++++++
7 files changed, 315 insertions(+)
create mode 100644 lib/nolibc/include/unistd.h
create mode 100644 lib/vfscore/Makefile.uk
create mode 100644 lib/vfscore/export.syms
create mode 100644 lib/vfscore/fd.c
create mode 100644 lib/vfscore/file.c
create mode 100644 lib/vfscore/include/vfscore/file.h
diff --git a/lib/Makefile.uk b/lib/Makefile.uk
index a594137..de4eb21 100644
--- a/lib/Makefile.uk
+++ b/lib/Makefile.uk
@@ -13,3 +13,4 @@ $(eval $(call _import_lib,$(UK_BASE)/lib/ukallocbbuddy))
$(eval $(call _import_lib,$(UK_BASE)/lib/uksched))
$(eval $(call _import_lib,$(UK_BASE)/lib/ukschedcoop))
$(eval $(call _import_lib,$(UK_BASE)/lib/fdt))
+$(eval $(call _import_lib,$(UK_BASE)/lib/vfscore))
diff --git a/lib/nolibc/include/unistd.h b/lib/nolibc/include/unistd.h
new file mode 100644
index 0000000..b723b6a
--- /dev/null
+++ b/lib/nolibc/include/unistd.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
+ *
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __UNISTD_H__
+#define __UNISTD_H__
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int close(int fd);
+ssize_t write(int fd, const void *buf, size_t count);
+ssize_t read(int fd, void *buf, size_t count);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* __UNISTD_H__ */
diff --git a/lib/vfscore/Makefile.uk b/lib/vfscore/Makefile.uk
new file mode 100644
index 0000000..fa56c8e
--- /dev/null
+++ b/lib/vfscore/Makefile.uk
@@ -0,0 +1,6 @@
+$(eval $(call addlib,libvfscore))
+
+CINCLUDES-y += -I$(LIBVFSCORE_BASE)/include
+
+LIBVFSCORE_SRCS-y += $(LIBVFSCORE_BASE)/fd.c
+LIBVFSCORE_SRCS-y += $(LIBVFSCORE_BASE)/file.c
diff --git a/lib/vfscore/export.syms b/lib/vfscore/export.syms
new file mode 100644
index 0000000..d9c7769
--- /dev/null
+++ b/lib/vfscore/export.syms
@@ -0,0 +1,6 @@
+vfscore_alloc_fd
+vfscore_put_fd
+vfscore_install_fd
+close
+write
+read
diff --git a/lib/vfscore/fd.c b/lib/vfscore/fd.c
new file mode 100644
index 0000000..dd84400
--- /dev/null
+++ b/lib/vfscore/fd.c
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
+ *
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#include <string.h>
+#include <uk/essentials.h>
+#include <uk/arch/atomic.h>
+#include <uk/assert.h>
+#include <vfscore/file.h>
+
+#define FDTABLE_MAX_FILES (sizeof(uint64_t) * 8)
+
+struct fdtable {
+ uint64_t bitmap;
+ uint32_t fd_start;
+ struct vfscore_file *files[FDTABLE_MAX_FILES];
+};
+struct fdtable fdtable;
+
+__constructor static void fdtable_init(void)
+{
+ memset(&fdtable, 0, sizeof(fdtable));
+
+ /* reserve stdin, stdout and stderr */
+ fdtable.bitmap = 7;
+}
+
+int vfscore_alloc_fd(void)
+{
+ int ret = ukarch_find_lsbit(~fdtable.bitmap);
+
+ if (!ret)
+ return ret;
+
+ fdtable.bitmap |= (uint64_t) 1 << ret;
+
+ return ret;
+}
+
+void vfscore_put_fd(int fd)
+{
+ UK_ASSERT(fd < (int) FDTABLE_MAX_FILES);
+ /* Currently it is not allowed to free std(in|out|err) */
+ UK_ASSERT(fd >= 2);
+
+ fdtable.bitmap ^= (uint64_t) 1 << fd;
+}
+
+void vfscore_install_fd(int fd, struct vfscore_file *file)
+{
+ UK_ASSERT(fd < (int) FDTABLE_MAX_FILES);
+ UK_ASSERT(fd >= 2);
+ UK_ASSERT(file);
+
+ file->fd = fd;
+ fdtable.files[fd] = file;
+}
+
+struct vfscore_file *get_file(int fd)
+{
+ UK_ASSERT(fd < (int) FDTABLE_MAX_FILES);
+ UK_ASSERT(fd >= 2);
+
+ if (!(fdtable.bitmap & ((uint64_t) 1 << fd)))
+ return NULL;
+
+ return fdtable.files[fd];
+}
diff --git a/lib/vfscore/file.c b/lib/vfscore/file.c
new file mode 100644
index 0000000..c186065
--- /dev/null
+++ b/lib/vfscore/file.c
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
+ *
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#include <unistd.h>
+#include <errno.h>
+#include <uk/print.h>
+#include <vfscore/file.h>
+#include <uk/assert.h>
+
+struct vfscore_file *get_file(int fd);
+
+int close(int fd)
+{
+ struct vfscore_file *file = get_file(fd);
+
+ if (!file) {
+ uk_printd(DLVL_WARN, "no such file descriptor: %d\n", fd);
+ errno = EBADF;
+ return -1;
+ }
+
+ UK_ASSERT(file->fops->close);
+ return file->fops->close(file);
+}
+
+ssize_t write(int fd, const void *buf, size_t count)
+{
+ struct vfscore_file *file = get_file(fd);
+
+ if (!file) {
+ uk_printd(DLVL_WARN, "no such file descriptor: %d\n", fd);
+ errno = EBADF;
+ return -1;
+ }
+
+ if (!file->fops->write) {
+ uk_printd(DLVL_WARN, "file does not have write op: %d\n", fd);
+ errno = EINVAL;
+ return -1;
+ }
+
+ return file->fops->write(file, buf, count);
+}
+
+ssize_t read(int fd, void *buf, size_t count)
+{
+ struct vfscore_file *file = get_file(fd);
+
+ if (!file) {
+ uk_printd(DLVL_WARN, "no such file descriptor: %d\n", fd);
+ errno = EBADF;
+ return -1;
+ }
+
+ if (!file->fops->read) {
+ uk_printd(DLVL_WARN, "file does not have read op: %d\n", fd);
+ errno = EINVAL;
+ return -1;
+ }
+
+ return file->fops->read(file, buf, count);
+}
diff --git a/lib/vfscore/include/vfscore/file.h
b/lib/vfscore/include/vfscore/file.h
new file mode 100644
index 0000000..4558eb3
--- /dev/null
+++ b/lib/vfscore/include/vfscore/file.h
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Authors: Yuri Volchkov <yuri.volchkov@xxxxxxxxx>
+ *
+ *
+ * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
+ */
+
+#ifndef __VFSCORE_FILE_H__
+#define __VFSCORE_FILE_H__
+
+#include <stdint.h>
+
+struct vfscore_file;
+
+struct vfscore_fops {
+ int (*close)(struct vfscore_file *);
+ ssize_t (*write)(struct vfscore_file *, const void *, size_t);
+ ssize_t (*read)(struct vfscore_file *, void *, size_t);
+};
+
+struct vfscore_file {
+ int fd;
+ struct vfscore_fops *fops;
+};
+
+int vfscore_alloc_fd(void);
+void vfscore_put_fd(int fd);
+void vfscore_install_fd(int fd, struct vfscore_file *file);
+
+#endif /* __VFSCORE_FILE_H__ */
--
2.17.0
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