401 lines
9.1 KiB
C
401 lines
9.1 KiB
C
#define FUSE_USE_VERSION 26
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#include <dirent.h>
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#include <errno.h>
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#include <libgen.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/statvfs.h>
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#include <sys/xattr.h>
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#include <unistd.h>
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#include <config.h>
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#include <fuse/fuse.h>
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unsigned char get_byte(int id);
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struct options {
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char *mdd;
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} options;
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/** macro to define options */
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#define PIFS_OPT_KEY(t, p, v) { t, offsetof(struct options, p), v }
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static struct fuse_opt pifs_opts[] =
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{
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PIFS_OPT_KEY("mdd=%s", mdd, 0),
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};
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#define FULL_PATH(path) \
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char full_path[PATH_MAX]; \
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snprintf(full_path, PATH_MAX, "%s%s", options.mdd, path); \
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printf("full_path: %s\n", full_path);
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static int pifs_getattr(const char *path, struct stat *buf)
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{
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FULL_PATH(path);
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int ret = lstat(full_path, buf);
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buf->st_size /= 2;
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return ret == -1 ? -errno : ret;
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}
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static int pifs_readlink(const char *path, char *buf, size_t bufsiz)
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{
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FULL_PATH(path);
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int ret = readlink(full_path, buf, bufsiz - 1);
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if (ret == -1) {
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return -errno;
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}
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buf[ret] = '\0';
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return 0;
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}
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static int pifs_mknod(const char *path, mode_t mode, dev_t dev)
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{
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FULL_PATH(path);
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int ret = mknod(full_path, mode, dev);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_mkdir(const char *path, mode_t mode)
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{
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FULL_PATH(path);
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int ret = mkdir(full_path, mode | S_IFDIR);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_unlink(const char *path)
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{
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FULL_PATH(path);
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int ret = unlink(full_path);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_rmdir(const char *path)
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{
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FULL_PATH(path);
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int ret = rmdir(full_path);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_symlink(const char *oldpath, const char *newpath)
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{
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FULL_PATH(newpath);
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int ret = symlink(oldpath, full_path);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_rename(const char *oldpath, const char *newpath)
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{
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FULL_PATH(newpath);
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int ret = rename(oldpath, full_path);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_link(const char *oldpath, const char *newpath)
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{
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FULL_PATH(newpath);
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int ret = link(oldpath, full_path);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_chmod(const char *path, mode_t mode)
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{
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FULL_PATH(path);
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int ret = chmod(full_path, mode);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_chown(const char *path, uid_t owner, gid_t group)
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{
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FULL_PATH(path);
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int ret = chown(full_path, owner, group);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_truncate(const char *path, off_t length)
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{
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FULL_PATH(path);
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int ret = truncate(full_path, length * 2);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_utime(const char *path, struct utimbuf *times)
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{
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FULL_PATH(path);
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int ret = utime(full_path, times);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_open(const char *path, struct fuse_file_info *info)
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{
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FULL_PATH(path);
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int ret = open(full_path, info->flags);
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info->fh = ret;
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return ret == -1 ? -errno : 0;
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}
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static int pifs_read(const char *path, char *buf, size_t count, off_t offset,
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struct fuse_file_info *info)
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{
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int ret = lseek(info->fh, offset * 2, SEEK_SET);
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if (ret == -1) {
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return -errno;
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}
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for (size_t i = 0; i < count; i++) {
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short index;
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ret = read(info->fh, &index, sizeof index);
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if (ret == -1) {
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return -errno;
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} else if (ret == 0) {
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return i;
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}
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*buf = (char) get_byte(index);
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buf++;
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}
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return count;
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}
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static int pifs_write(const char *path, const char *buf, size_t count,
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off_t offset, struct fuse_file_info *info)
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{
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int ret = lseek(info->fh, offset * 2, SEEK_SET);
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if (ret == -1) {
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return -errno;
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}
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for (size_t i = 0; i < count; i++) {
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short index;
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for (index = 0; index < SHRT_MAX; index++) {
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if (get_byte(index) == *buf) {
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break;
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}
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}
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ret = write(info->fh, &index, sizeof index);
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if (ret == -1) {
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return -errno;
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}
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buf++;
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}
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return count;
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}
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static int pifs_statfs(const char *path, struct statvfs *buf)
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{
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FULL_PATH(path);
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int ret = statvfs(full_path, buf);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_release(const char *path, struct fuse_file_info *info)
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{
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int ret = close(info->fh);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_fsync(const char *path, int datasync,
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struct fuse_file_info *info)
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{
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int ret = datasync ? fdatasync(info->fh) : fsync(info->fh);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_setxattr(const char *path, const char *name, const char *value,
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size_t size, int flags)
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{
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FULL_PATH(path);
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int ret = setxattr(full_path, name, value, size, flags);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_getxattr(const char *path, const char *name, char *value,
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size_t size)
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{
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FULL_PATH(path);
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int ret = getxattr(full_path, name, value, size);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_listxattr(const char *path, char *list, size_t size)
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{
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FULL_PATH(path);
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int ret = listxattr(full_path, list, size);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_removexattr(const char *path, const char *name)
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{
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FULL_PATH(path);
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int ret = removexattr(full_path, name);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_opendir(const char *path, struct fuse_file_info *info)
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{
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FULL_PATH(path);
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DIR *dir = opendir(full_path);
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info->fh = (uint64_t) dir;
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return !dir ? -errno : 0;
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}
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static int pifs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
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off_t offset, struct fuse_file_info *info)
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{
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DIR *dir = (DIR *) info->fh;
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if (offset) {
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seekdir(dir, offset);
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}
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int ret;
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do {
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errno = 0;
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struct dirent *de = readdir(dir);
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if (!de) {
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if (errno) {
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return -errno;
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} else {
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break;
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}
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}
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ret = filler(buf, de->d_name, NULL, de->d_off);
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} while (ret == 0);
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return 0;
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}
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static int pifs_releasedir(const char *path, struct fuse_file_info *info)
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{
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int ret = closedir((DIR *)info->fh);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_fsyncdir(const char *path, int datasync,
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struct fuse_file_info *info)
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{
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int fd = dirfd((DIR *)info->fh);
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if (fd == -1) {
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return -errno;
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}
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int ret = datasync ? fdatasync(fd) : fsync(fd);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_access(const char *path, int mode)
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{
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FULL_PATH(path);
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int ret = access(full_path, mode);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_create(const char *path, mode_t mode,
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struct fuse_file_info *info)
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{
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FULL_PATH(path);
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int ret = creat(full_path, mode);
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info->fh = ret;
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return ret == -1 ? -errno : 0;
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}
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static int pifs_ftruncate(const char *path, off_t length,
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struct fuse_file_info *info)
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{
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int ret = ftruncate(info->fh, length * 2);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_fgetattr(const char *path, struct stat *buf,
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struct fuse_file_info *info)
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{
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int ret = fstat(info->fh, buf);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_lock(const char *path, struct fuse_file_info *info, int cmd,
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struct flock *lock)
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{
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int ret = fcntl(info->fh, cmd, lock);
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return ret == -1 ? -errno : ret;
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}
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static int pifs_utimens(const char *path, const struct timespec times[2])
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{
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DIR *dir = opendir(options.mdd);
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if (!dir) {
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return -errno;
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}
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int ret = utimensat(dirfd(dir), basename((char *) path), times, 0);
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closedir(dir);
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return ret == -1 ? -errno : ret;
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}
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static struct fuse_operations pifs_ops = {
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.getattr = pifs_getattr,
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.readlink = pifs_readlink,
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.mknod = pifs_mknod,
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.mkdir = pifs_mkdir,
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.rmdir = pifs_rmdir,
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.unlink = pifs_unlink,
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.symlink = pifs_symlink,
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.rename = pifs_rename,
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.link = pifs_link,
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.chmod = pifs_chmod,
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.chown = pifs_chown,
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.truncate = pifs_truncate,
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.utime = pifs_utime,
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.open = pifs_open,
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.read = pifs_read,
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.write = pifs_write,
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.statfs = pifs_statfs,
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.release = pifs_release,
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.fsync = pifs_fsync,
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.setxattr = pifs_setxattr,
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.getxattr = pifs_getxattr,
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.listxattr = pifs_listxattr,
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.removexattr = pifs_removexattr,
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.opendir = pifs_opendir,
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.readdir = pifs_readdir,
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.releasedir = pifs_releasedir,
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.fsyncdir = pifs_fsyncdir,
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.access = pifs_access,
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.create = pifs_create,
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.ftruncate = pifs_ftruncate,
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.fgetattr = pifs_fgetattr,
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.lock = pifs_lock,
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.utimens = pifs_utimens,
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.flag_nullpath_ok = 1,
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};
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int main (int argc, char *argv[])
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{
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int ret;
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struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
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memset(&options, 0, sizeof(struct options));
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if (fuse_opt_parse(&args, &options, pifs_opts, NULL) == -1) {
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return -1;
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}
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if (!options.mdd) {
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fprintf(stderr,
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"%s: Metadata directory must be specified with -o mdd=<directory>\n",
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argv[0]);
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return -1;
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}
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if (access(options.mdd, R_OK | W_OK | X_OK) == -1) {
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fprintf(stderr, "%s: Cannot access metadata directory '%s': %s\n",
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argv[0], options.mdd, strerror(errno));
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return -1;
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}
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ret = fuse_main(args.argc, args.argv, &pifs_ops, NULL);
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fuse_opt_free_args(&args);
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return ret;
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}
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