376 строки
8.0 KiB
C
376 строки
8.0 KiB
C
/*
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* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <errno.h>
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#include <utime.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/vfs.h>
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#include "hostfs.h"
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#include "kern_util.h"
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#include "user.h"
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int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
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int *nlink_out, int *uid_out, int *gid_out,
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unsigned long long *size_out, struct timespec *atime_out,
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struct timespec *mtime_out, struct timespec *ctime_out,
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int *blksize_out, unsigned long long *blocks_out)
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{
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struct stat64 buf;
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if(lstat64(path, &buf) < 0)
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return(-errno);
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if(inode_out != NULL) *inode_out = buf.st_ino;
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if(mode_out != NULL) *mode_out = buf.st_mode;
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if(nlink_out != NULL) *nlink_out = buf.st_nlink;
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if(uid_out != NULL) *uid_out = buf.st_uid;
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if(gid_out != NULL) *gid_out = buf.st_gid;
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if(size_out != NULL) *size_out = buf.st_size;
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if(atime_out != NULL) {
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atime_out->tv_sec = buf.st_atime;
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atime_out->tv_nsec = 0;
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}
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if(mtime_out != NULL) {
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mtime_out->tv_sec = buf.st_mtime;
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mtime_out->tv_nsec = 0;
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}
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if(ctime_out != NULL) {
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ctime_out->tv_sec = buf.st_ctime;
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ctime_out->tv_nsec = 0;
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}
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if(blksize_out != NULL) *blksize_out = buf.st_blksize;
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if(blocks_out != NULL) *blocks_out = buf.st_blocks;
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return(0);
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}
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int file_type(const char *path, int *maj, int *min)
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{
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struct stat64 buf;
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if(lstat64(path, &buf) < 0)
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return(-errno);
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/*We cannot pass rdev as is because glibc and the kernel disagree
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*about its definition.*/
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if(maj != NULL)
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*maj = major(buf.st_rdev);
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if(min != NULL)
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*min = minor(buf.st_rdev);
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if(S_ISDIR(buf.st_mode)) return(OS_TYPE_DIR);
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else if(S_ISLNK(buf.st_mode)) return(OS_TYPE_SYMLINK);
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else if(S_ISCHR(buf.st_mode)) return(OS_TYPE_CHARDEV);
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else if(S_ISBLK(buf.st_mode)) return(OS_TYPE_BLOCKDEV);
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else if(S_ISFIFO(buf.st_mode))return(OS_TYPE_FIFO);
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else if(S_ISSOCK(buf.st_mode))return(OS_TYPE_SOCK);
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else return(OS_TYPE_FILE);
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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) mode = R_OK;
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if(w) mode |= W_OK;
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if(x) mode |= X_OK;
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if(access(path, mode) != 0) 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) 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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if(dir == NULL) return(NULL);
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return(dir);
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}
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char *read_dir(void *stream, unsigned long long *pos,
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unsigned long long *ino_out, int *len_out)
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{
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DIR *dir = stream;
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struct dirent *ent;
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seekdir(dir, *pos);
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ent = readdir(dir);
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if(ent == NULL) 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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*pos = telldir(dir);
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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) 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) 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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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 ur, int uw, int ux, int gr,
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int gw, int gx, int or, int ow, int ox)
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{
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int mode, fd;
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mode = 0;
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mode |= ur ? S_IRUSR : 0;
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mode |= uw ? S_IWUSR : 0;
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mode |= ux ? S_IXUSR : 0;
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mode |= gr ? S_IRGRP : 0;
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mode |= gw ? S_IWGRP : 0;
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mode |= gx ? S_IXGRP : 0;
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mode |= or ? S_IROTH : 0;
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mode |= ow ? S_IWOTH : 0;
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mode |= ox ? S_IXOTH : 0;
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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)
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{
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struct utimbuf buf;
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int err, ma;
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if(attrs->ia_valid & HOSTFS_ATTR_MODE){
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if(chmod(file, attrs->ia_mode) != 0) return(-errno);
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}
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if(attrs->ia_valid & HOSTFS_ATTR_UID){
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if(chown(file, attrs->ia_uid, -1)) return(-errno);
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}
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if(attrs->ia_valid & HOSTFS_ATTR_GID){
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if(chown(file, -1, attrs->ia_gid)) return(-errno);
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}
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if(attrs->ia_valid & HOSTFS_ATTR_SIZE){
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if(truncate(file, attrs->ia_size)) return(-errno);
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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) == ma){
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buf.actime = attrs->ia_atime.tv_sec;
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buf.modtime = attrs->ia_mtime.tv_sec;
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if(utime(file, &buf) != 0) return(-errno);
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}
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else {
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struct timespec ts;
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if(attrs->ia_valid & HOSTFS_ATTR_ATIME_SET){
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err = stat_file(file, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, &ts, NULL, NULL, NULL);
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if(err != 0)
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return(err);
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buf.actime = attrs->ia_atime.tv_sec;
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buf.modtime = ts.tv_sec;
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if(utime(file, &buf) != 0)
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return(-errno);
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}
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if(attrs->ia_valid & HOSTFS_ATTR_MTIME_SET){
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err = stat_file(file, NULL, NULL, NULL, NULL, NULL,
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NULL, &ts, NULL, NULL, NULL, NULL);
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if(err != 0)
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return(err);
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buf.actime = ts.tv_sec;
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buf.modtime = attrs->ia_mtime.tv_sec;
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if(utime(file, &buf) != 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_CTIME) ;
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if(attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)){
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err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
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&attrs->ia_atime, &attrs->ia_mtime, NULL,
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NULL, NULL);
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if(err != 0) 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) 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) 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) return(-errno);
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return(0);
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}
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int 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) 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, makedev(major, minor));
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if(err) 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) return(-errno);
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return(0);
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}
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int 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) return(-errno);
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return(0);
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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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long *spare_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) 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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spare_out[0] = buf.f_spare[0];
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spare_out[1] = buf.f_spare[1];
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spare_out[2] = buf.f_spare[2];
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spare_out[3] = buf.f_spare[3];
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spare_out[4] = buf.f_spare[4];
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return(0);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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