Add zfs_file_* interface, remove vnodes

Provide a common zfs_file_* interface which can be implemented on all 
platforms to perform normal file access from either the kernel module
or the libzpool library.

This allows all non-portable vnode_t usage in the common code to be 
replaced by the new portable zfs_file_t.  The associated vnode and
kobj compatibility functions, types, and macros have been removed
from the SPL.  Moving forward, vnodes should only be used in platform
specific code when provided by the native operating system.

Reviewed-by: Sean Eric Fagan <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Igor Kozhukhov <[email protected]>
Reviewed-by: Jorgen Lundman <[email protected]>
Signed-off-by: Matt Macy <[email protected]>
Closes #9556 

1 files changed, 61 insertions, 0 deletions

diff --git a/include/sys/zfs_file.h b/include/sys/zfs_file.h
new file mode 100644
index 000000000..6b33420e3
--- /dev/null
+++ b/include/sys/zfs_file.h
@@ -0,0 +1,61 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+#ifndef	_SYS_ZFS_FILE_H
+#define	_SYS_ZFS_FILE_H
+
+#ifndef _KERNEL
+typedef struct zfs_file {
+	int f_fd;
+	int f_dump_fd;
+} zfs_file_t;
+#elif defined(__linux__) || defined(__FreeBSD__)
+typedef struct file zfs_file_t;
+#else
+#error "unknown OS"
+#endif
+
+typedef struct zfs_file_attr {
+	uint64_t	zfa_size;	/* file size */
+	mode_t		zfa_mode;	/* file type */
+} zfs_file_attr_t;
+
+int zfs_file_open(const char *path, int flags, int mode, zfs_file_t **fp);
+void zfs_file_close(zfs_file_t *fp);
+
+int zfs_file_write(zfs_file_t *fp, const void *buf, size_t len, ssize_t *resid);
+int zfs_file_pwrite(zfs_file_t *fp, const void *buf, size_t len, loff_t off,
+    ssize_t *resid);
+int zfs_file_read(zfs_file_t *fp, void *buf, size_t len, ssize_t *resid);
+int zfs_file_pread(zfs_file_t *fp, void *buf, size_t len, loff_t off,
+    ssize_t *resid);
+
+int zfs_file_seek(zfs_file_t *fp, loff_t *offp, int whence);
+int zfs_file_getattr(zfs_file_t *fp, zfs_file_attr_t *zfattr);
+int zfs_file_fsync(zfs_file_t *fp, int flags);
+int zfs_file_fallocate(zfs_file_t *fp, int mode, loff_t offset, loff_t len);
+loff_t zfs_file_off(zfs_file_t *fp);
+int zfs_file_unlink(const char *);
+
+int zfs_file_get(int fd, zfs_file_t **fp);
+void zfs_file_put(int fd);
+
+#endif /* _SYS_ZFS_FILE_H */