/* * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ #include <stdio.h> #include <stddef.h> #include <unistd.h> #include <dirent.h> #include <errno.h> #include <fcntl.h> #include <string.h> #include <sys/stat.h> #include <sys/time.h> #include <sys/types.h> #include <sys/vfs.h> #include <sys/syscall.h> #include "hostfs.h" #include <utime.h> static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p) { p->ino = buf->st_ino; p->mode = buf->st_mode; p->nlink = buf->st_nlink; p->uid = buf->st_uid; p->gid = buf->st_gid; p->size = buf->st_size; p->atime.tv_sec = buf->st_atime; p->atime.tv_nsec = 0; p->ctime.tv_sec = buf->st_ctime; p->ctime.tv_nsec = 0; p->mtime.tv_sec = buf->st_mtime; p->mtime.tv_nsec = 0; p->blksize = buf->st_blksize; p->blocks = buf->st_blocks; p->maj = os_major(buf->st_rdev); p->min = os_minor(buf->st_rdev); } int stat_file(const char *path, struct hostfs_stat *p, int fd) { struct stat64 buf; if (fd >= 0) { if (fstat64(fd, &buf) < 0) return -errno; } else if (lstat64(path, &buf) < 0) { return -errno; } stat64_to_hostfs(&buf, p); return 0; } int access_file(char *path, int r, int w, int x) { int mode = 0; if (r) mode = R_OK; if (w) mode |= W_OK; if (x) mode |= X_OK; if (access(path, mode) != 0) return -errno; else return 0; } int open_file(char *path, int r, int w, int append) { int mode = 0, fd; if (r && !w) mode = O_RDONLY; else if (!r && w) mode = O_WRONLY; else if (r && w) mode = O_RDWR; else panic("Impossible mode in open_file"); if (append) mode |= O_APPEND; fd = open64(path, mode); if (fd < 0) return -errno; else return fd; } void *open_dir(char *path, int *err_out) { DIR *dir; dir = opendir(path); *err_out = errno; return dir; } char *read_dir(void *stream, unsigned long long *pos, unsigned long long *ino_out, int *len_out, unsigned int *type_out) { DIR *dir = stream; struct dirent *ent; seekdir(dir, *pos); ent = readdir(dir); if (ent == NULL) return NULL; *len_out = strlen(ent->d_name); *ino_out = ent->d_ino; *type_out = ent->d_type; *pos = telldir(dir); return ent->d_name; } int read_file(int fd, unsigned long long *offset, char *buf, int len) { int n; n = pread64(fd, buf, len, *offset); if (n < 0) return -errno; *offset += n; return n; } int write_file(int fd, unsigned long long *offset, const char *buf, int len) { int n; n = pwrite64(fd, buf, len, *offset); if (n < 0) return -errno; *offset += n; return n; } int lseek_file(int fd, long long offset, int whence) { int ret; ret = lseek64(fd, offset, whence); if (ret < 0) return -errno; return 0; } int fsync_file(int fd, int datasync) { int ret; if (datasync) ret = fdatasync(fd); else ret = fsync(fd); if (ret < 0) return -errno; return 0; } int replace_file(int oldfd, int fd) { return dup2(oldfd, fd); } void close_file(void *stream) { close(*((int *) stream)); } void close_dir(void *stream) { closedir(stream); } int file_create(char *name, int ur, int uw, int ux, int gr, int gw, int gx, int or, int ow, int ox) { int mode, fd; mode = 0; mode |= ur ? S_IRUSR : 0; mode |= uw ? S_IWUSR : 0; mode |= ux ? S_IXUSR : 0; mode |= gr ? S_IRGRP : 0; mode |= gw ? S_IWGRP : 0; mode |= gx ? S_IXGRP : 0; mode |= or ? S_IROTH : 0; mode |= ow ? S_IWOTH : 0; mode |= ox ? S_IXOTH : 0; fd = open64(name, O_CREAT | O_RDWR, mode); if (fd < 0) return -errno; return fd; } int set_attr(const char *file, struct hostfs_iattr *attrs, int fd) { struct hostfs_stat st; struct timeval times[2]; int err, ma; if (attrs->ia_valid & HOSTFS_ATTR_MODE) { if (fd >= 0) { if (fchmod(fd, attrs->ia_mode) != 0) return -errno; } else if (chmod(file, attrs->ia_mode) != 0) { return -errno; } } if (attrs->ia_valid & HOSTFS_ATTR_UID) { if (fd >= 0) { if (fchown(fd, attrs->ia_uid, -1)) return -errno; } else if (chown(file, attrs->ia_uid, -1)) { return -errno; } } if (attrs->ia_valid & HOSTFS_ATTR_GID) { if (fd >= 0) { if (fchown(fd, -1, attrs->ia_gid)) return -errno; } else if (chown(file, -1, attrs->ia_gid)) { return -errno; } } if (attrs->ia_valid & HOSTFS_ATTR_SIZE) { if (fd >= 0) { if (ftruncate(fd, attrs->ia_size)) return -errno; } else if (truncate(file, attrs->ia_size)) { return -errno; } } /* * Update accessed and/or modified time, in two parts: first set * times according to the changes to perform, and then call futimes() * or utimes() to apply them. */ ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET); if (attrs->ia_valid & ma) { err = stat_file(file, &st, fd); if (err != 0) return err; times[0].tv_sec = st.atime.tv_sec; times[0].tv_usec = st.atime.tv_nsec / 1000; times[1].tv_sec = st.mtime.tv_sec; times[1].tv_usec = st.mtime.tv_nsec / 1000; if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) { times[0].tv_sec = attrs->ia_atime.tv_sec; times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000; } if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) { times[1].tv_sec = attrs->ia_mtime.tv_sec; times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000; } if (fd >= 0) { if (futimes(fd, times) != 0) return -errno; } else if (utimes(file, times) != 0) { return -errno; } } /* Note: ctime is not handled */ if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) { err = stat_file(file, &st, fd); attrs->ia_atime = st.atime; attrs->ia_mtime = st.mtime; if (err != 0) return err; } return 0; } int make_symlink(const char *from, const char *to) { int err; err = symlink(to, from); if (err) return -errno; return 0; } int unlink_file(const char *file) { int err; err = unlink(file); if (err) return -errno; return 0; } int do_mkdir(const char *file, int mode) { int err; err = mkdir(file, mode); if (err) return -errno; return 0; } int do_rmdir(const char *file) { int err; err = rmdir(file); if (err) return -errno; return 0; } int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor) { int err; err = mknod(file, mode, os_makedev(major, minor)); if (err) return -errno; return 0; } int link_file(const char *to, const char *from) { int err; err = link(to, from); if (err) return -errno; return 0; } int hostfs_do_readlink(char *file, char *buf, int size) { int n; n = readlink(file, buf, size); if (n < 0) return -errno; if (n < size) buf[n] = '\0'; return n; } int rename_file(char *from, char *to) { int err; err = rename(from, to); if (err < 0) return -errno; return 0; } int rename2_file(char *from, char *to, unsigned int flags) { int err; #ifndef SYS_renameat2 # ifdef __x86_64__ # define SYS_renameat2 316 # endif # ifdef __i386__ # define SYS_renameat2 353 # endif #endif #ifdef SYS_renameat2 err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags); if (err < 0) { if (errno != ENOSYS) return -errno; else return -EINVAL; } return 0; #else return -EINVAL; #endif } int do_statfs(char *root, long *bsize_out, long long *blocks_out, long long *bfree_out, long long *bavail_out, long long *files_out, long long *ffree_out, void *fsid_out, int fsid_size, long *namelen_out) { struct statfs64 buf; int err; err = statfs64(root, &buf); if (err < 0) return -errno; *bsize_out = buf.f_bsize; *blocks_out = buf.f_blocks; *bfree_out = buf.f_bfree; *bavail_out = buf.f_bavail; *files_out = buf.f_files; *ffree_out = buf.f_ffree; memcpy(fsid_out, &buf.f_fsid, sizeof(buf.f_fsid) > fsid_size ? fsid_size : sizeof(buf.f_fsid)); *namelen_out = buf.f_namelen; return 0; }