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