1 files changed, 567 insertions, 0 deletions
diff --git a/draft/fuse-examples/fusexmp_fh.c b/draft/fuse-examples/fusexmp_fh.c
new file mode 100644
index 0000000..1ba9dbc
--- /dev/null
+++ b/draft/fuse-examples/fusexmp_fh.c
@@ -0,0 +1,567 @@
+/*
+  FUSE: Filesystem in Userspace
+  Copyright (C) 2001-2007  Miklos Szeredi <miklos@szeredi.hu>
+  Copyright (C) 2011       Sebastian Pipping <sebastian@pipping.org>
+
+  This program can be distributed under the terms of the GNU GPL.
+  See the file COPYING.
+
+  gcc -Wall fusexmp_fh.c `pkg-config fuse --cflags --libs` -lulockmgr -o fusexmp_fh
+*/
+
+#define FUSE_USE_VERSION 26
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#define _GNU_SOURCE
+
+#include <fuse.h>
+#include <ulockmgr.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <errno.h>
+#include <sys/time.h>
+#ifdef HAVE_SETXATTR
+#include <sys/xattr.h>
+#endif
+#include <sys/file.h> /* flock(2) */
+
+static int xmp_getattr(const char *path, struct stat *stbuf)
+{
+	int res;
+
+	res = lstat(path, stbuf);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_fgetattr(const char *path, struct stat *stbuf,
+			struct fuse_file_info *fi)
+{
+	int res;
+
+	(void) path;
+
+	res = fstat(fi->fh, stbuf);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_access(const char *path, int mask)
+{
+	int res;
+
+	res = access(path, mask);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_readlink(const char *path, char *buf, size_t size)
+{
+	int res;
+
+	res = readlink(path, buf, size - 1);
+	if (res == -1)
+		return -errno;
+
+	buf[res] = '\0';
+	return 0;
+}
+
+struct xmp_dirp {
+	DIR *dp;
+	struct dirent *entry;
+	off_t offset;
+};
+
+static int xmp_opendir(const char *path, struct fuse_file_info *fi)
+{
+	int res;
+	struct xmp_dirp *d = malloc(sizeof(struct xmp_dirp));
+	if (d == NULL)
+		return -ENOMEM;
+
+	d->dp = opendir(path);
+	if (d->dp == NULL) {
+		res = -errno;
+		free(d);
+		return res;
+	}
+	d->offset = 0;
+	d->entry = NULL;
+
+	fi->fh = (unsigned long) d;
+	return 0;
+}
+
+static inline struct xmp_dirp *get_dirp(struct fuse_file_info *fi)
+{
+	return (struct xmp_dirp *) (uintptr_t) fi->fh;
+}
+
+static int xmp_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
+		       off_t offset, struct fuse_file_info *fi)
+{
+	struct xmp_dirp *d = get_dirp(fi);
+
+	(void) path;
+	if (offset != d->offset) {
+		seekdir(d->dp, offset);
+		d->entry = NULL;
+		d->offset = offset;
+	}
+	while (1) {
+		struct stat st;
+		off_t nextoff;
+
+		if (!d->entry) {
+			d->entry = readdir(d->dp);
+			if (!d->entry)
+				break;
+		}
+
+		memset(&st, 0, sizeof(st));
+		st.st_ino = d->entry->d_ino;
+		st.st_mode = d->entry->d_type << 12;
+		nextoff = telldir(d->dp);
+		if (filler(buf, d->entry->d_name, &st, nextoff))
+			break;
+
+		d->entry = NULL;
+		d->offset = nextoff;
+	}
+
+	return 0;
+}
+
+static int xmp_releasedir(const char *path, struct fuse_file_info *fi)
+{
+	struct xmp_dirp *d = get_dirp(fi);
+	(void) path;
+	closedir(d->dp);
+	free(d);
+	return 0;
+}
+
+static int xmp_mknod(const char *path, mode_t mode, dev_t rdev)
+{
+	int res;
+
+	if (S_ISFIFO(mode))
+		res = mkfifo(path, mode);
+	else
+		res = mknod(path, mode, rdev);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_mkdir(const char *path, mode_t mode)
+{
+	int res;
+
+	res = mkdir(path, mode);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_unlink(const char *path)
+{
+	int res;
+
+	res = unlink(path);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_rmdir(const char *path)
+{
+	int res;
+
+	res = rmdir(path);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_symlink(const char *from, const char *to)
+{
+	int res;
+
+	res = symlink(from, to);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_rename(const char *from, const char *to)
+{
+	int res;
+
+	res = rename(from, to);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_link(const char *from, const char *to)
+{
+	int res;
+
+	res = link(from, to);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_chmod(const char *path, mode_t mode)
+{
+	int res;
+
+	res = chmod(path, mode);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_chown(const char *path, uid_t uid, gid_t gid)
+{
+	int res;
+
+	res = lchown(path, uid, gid);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_truncate(const char *path, off_t size)
+{
+	int res;
+
+	res = truncate(path, size);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_ftruncate(const char *path, off_t size,
+			 struct fuse_file_info *fi)
+{
+	int res;
+
+	(void) path;
+
+	res = ftruncate(fi->fh, size);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+#ifdef HAVE_UTIMENSAT
+static int xmp_utimens(const char *path, const struct timespec ts[2])
+{
+	int res;
+
+	/* don't use utime/utimes since they follow symlinks */
+	res = utimensat(0, path, ts, AT_SYMLINK_NOFOLLOW);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+#endif
+
+static int xmp_create(const char *path, mode_t mode, struct fuse_file_info *fi)
+{
+	int fd;
+
+	fd = open(path, fi->flags, mode);
+	if (fd == -1)
+		return -errno;
+
+	fi->fh = fd;
+	return 0;
+}
+
+static int xmp_open(const char *path, struct fuse_file_info *fi)
+{
+	int fd;
+
+	fd = open(path, fi->flags);
+	if (fd == -1)
+		return -errno;
+
+	fi->fh = fd;
+	return 0;
+}
+
+static int xmp_read(const char *path, char *buf, size_t size, off_t offset,
+		    struct fuse_file_info *fi)
+{
+	int res;
+
+	(void) path;
+	res = pread(fi->fh, buf, size, offset);
+	if (res == -1)
+		res = -errno;
+
+	return res;
+}
+
+static int xmp_read_buf(const char *path, struct fuse_bufvec **bufp,
+			size_t size, off_t offset, struct fuse_file_info *fi)
+{
+	struct fuse_bufvec *src;
+
+	(void) path;
+
+	src = malloc(sizeof(struct fuse_bufvec));
+	if (src == NULL)
+		return -ENOMEM;
+
+	*src = FUSE_BUFVEC_INIT(size);
+
+	src->buf[0].flags = FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK;
+	src->buf[0].fd = fi->fh;
+	src->buf[0].pos = offset;
+
+	*bufp = src;
+
+	return 0;
+}
+
+static int xmp_write(const char *path, const char *buf, size_t size,
+		     off_t offset, struct fuse_file_info *fi)
+{
+	int res;
+
+	(void) path;
+	res = pwrite(fi->fh, buf, size, offset);
+	if (res == -1)
+		res = -errno;
+
+	return res;
+}
+
+static int xmp_write_buf(const char *path, struct fuse_bufvec *buf,
+		     off_t offset, struct fuse_file_info *fi)
+{
+	struct fuse_bufvec dst = FUSE_BUFVEC_INIT(fuse_buf_size(buf));
+
+	(void) path;
+
+	dst.buf[0].flags = FUSE_BUF_IS_FD | FUSE_BUF_FD_SEEK;
+	dst.buf[0].fd = fi->fh;
+	dst.buf[0].pos = offset;
+
+	return fuse_buf_copy(&dst, buf, FUSE_BUF_SPLICE_NONBLOCK);
+}
+
+static int xmp_statfs(const char *path, struct statvfs *stbuf)
+{
+	int res;
+
+	res = statvfs(path, stbuf);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_flush(const char *path, struct fuse_file_info *fi)
+{
+	int res;
+
+	(void) path;
+	/* This is called from every close on an open file, so call the
+	   close on the underlying filesystem.	But since flush may be
+	   called multiple times for an open file, this must not really
+	   close the file.  This is important if used on a network
+	   filesystem like NFS which flush the data/metadata on close() */
+	res = close(dup(fi->fh));
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static int xmp_release(const char *path, struct fuse_file_info *fi)
+{
+	(void) path;
+	close(fi->fh);
+
+	return 0;
+}
+
+static int xmp_fsync(const char *path, int isdatasync,
+		     struct fuse_file_info *fi)
+{
+	int res;
+	(void) path;
+
+#ifndef HAVE_FDATASYNC
+	(void) isdatasync;
+#else
+	if (isdatasync)
+		res = fdatasync(fi->fh);
+	else
+#endif
+		res = fsync(fi->fh);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+#ifdef HAVE_POSIX_FALLOCATE
+static int xmp_fallocate(const char *path, int mode,
+			off_t offset, off_t length, struct fuse_file_info *fi)
+{
+	(void) path;
+
+	if (mode)
+		return -EOPNOTSUPP;
+
+	return -posix_fallocate(fi->fh, offset, length);
+}
+#endif
+
+#ifdef HAVE_SETXATTR
+/* xattr operations are optional and can safely be left unimplemented */
+static int xmp_setxattr(const char *path, const char *name, const char *value,
+			size_t size, int flags)
+{
+	int res = lsetxattr(path, name, value, size, flags);
+	if (res == -1)
+		return -errno;
+	return 0;
+}
+
+static int xmp_getxattr(const char *path, const char *name, char *value,
+			size_t size)
+{
+	int res = lgetxattr(path, name, value, size);
+	if (res == -1)
+		return -errno;
+	return res;
+}
+
+static int xmp_listxattr(const char *path, char *list, size_t size)
+{
+	int res = llistxattr(path, list, size);
+	if (res == -1)
+		return -errno;
+	return res;
+}
+
+static int xmp_removexattr(const char *path, const char *name)
+{
+	int res = lremovexattr(path, name);
+	if (res == -1)
+		return -errno;
+	return 0;
+}
+#endif /* HAVE_SETXATTR */
+
+static int xmp_lock(const char *path, struct fuse_file_info *fi, int cmd,
+		    struct flock *lock)
+{
+	(void) path;
+
+	return ulockmgr_op(fi->fh, cmd, lock, &fi->lock_owner,
+			   sizeof(fi->lock_owner));
+}
+
+static int xmp_flock(const char *path, struct fuse_file_info *fi, int op)
+{
+	int res;
+	(void) path;
+
+	res = flock(fi->fh, op);
+	if (res == -1)
+		return -errno;
+
+	return 0;
+}
+
+static struct fuse_operations xmp_oper = {
+	.getattr	= xmp_getattr,
+	.fgetattr	= xmp_fgetattr,
+	.access		= xmp_access,
+	.readlink	= xmp_readlink,
+	.opendir	= xmp_opendir,
+	.readdir	= xmp_readdir,
+	.releasedir	= xmp_releasedir,
+	.mknod		= xmp_mknod,
+	.mkdir		= xmp_mkdir,
+	.symlink	= xmp_symlink,
+	.unlink		= xmp_unlink,
+	.rmdir		= xmp_rmdir,
+	.rename		= xmp_rename,
+	.link		= xmp_link,
+	.chmod		= xmp_chmod,
+	.chown		= xmp_chown,
+	.truncate	= xmp_truncate,
+	.ftruncate	= xmp_ftruncate,
+#ifdef HAVE_UTIMENSAT
+	.utimens	= xmp_utimens,
+#endif
+	.create		= xmp_create,
+	.open		= xmp_open,
+	.read		= xmp_read,
+	.read_buf	= xmp_read_buf,
+	.write		= xmp_write,
+	.write_buf	= xmp_write_buf,
+	.statfs		= xmp_statfs,
+	.flush		= xmp_flush,
+	.release	= xmp_release,
+	.fsync		= xmp_fsync,
+#ifdef HAVE_POSIX_FALLOCATE
+	.fallocate	= xmp_fallocate,
+#endif
+#ifdef HAVE_SETXATTR
+	.setxattr	= xmp_setxattr,
+	.getxattr	= xmp_getxattr,
+	.listxattr	= xmp_listxattr,
+	.removexattr	= xmp_removexattr,
+#endif
+	.lock		= xmp_lock,
+	.flock		= xmp_flock,
+
+	.flag_nullpath_ok = 1,
+#if HAVE_UTIMENSAT
+	.flag_utime_omit_ok = 1,
+#endif
+};
+
+int main(int argc, char *argv[])
+{
+	umask(0);
+	return fuse_main(argc, argv, &xmp_oper, NULL);
+}