1 /* 2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #include <stdio.h> 7 #include <stddef.h> 8 #include <unistd.h> 9 #include <dirent.h> 10 #include <errno.h> 11 #include <fcntl.h> 12 #include <string.h> 13 #include <sys/stat.h> 14 #include <sys/time.h> 15 #include <sys/types.h> 16 #include <sys/vfs.h> 17 #include <sys/syscall.h> 18 #include "hostfs.h" 19 #include <utime.h> 20 21 static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p) 22 { 23 p->ino = buf->st_ino; 24 p->mode = buf->st_mode; 25 p->nlink = buf->st_nlink; 26 p->uid = buf->st_uid; 27 p->gid = buf->st_gid; 28 p->size = buf->st_size; 29 p->atime.tv_sec = buf->st_atime; 30 p->atime.tv_nsec = 0; 31 p->ctime.tv_sec = buf->st_ctime; 32 p->ctime.tv_nsec = 0; 33 p->mtime.tv_sec = buf->st_mtime; 34 p->mtime.tv_nsec = 0; 35 p->blksize = buf->st_blksize; 36 p->blocks = buf->st_blocks; 37 p->maj = os_major(buf->st_rdev); 38 p->min = os_minor(buf->st_rdev); 39 } 40 41 int stat_file(const char *path, struct hostfs_stat *p, int fd) 42 { 43 struct stat64 buf; 44 45 if (fd >= 0) { 46 if (fstat64(fd, &buf) < 0) 47 return -errno; 48 } else if (lstat64(path, &buf) < 0) { 49 return -errno; 50 } 51 stat64_to_hostfs(&buf, p); 52 return 0; 53 } 54 55 int access_file(char *path, int r, int w, int x) 56 { 57 int mode = 0; 58 59 if (r) 60 mode = R_OK; 61 if (w) 62 mode |= W_OK; 63 if (x) 64 mode |= X_OK; 65 if (access(path, mode) != 0) 66 return -errno; 67 else return 0; 68 } 69 70 int open_file(char *path, int r, int w, int append) 71 { 72 int mode = 0, fd; 73 74 if (r && !w) 75 mode = O_RDONLY; 76 else if (!r && w) 77 mode = O_WRONLY; 78 else if (r && w) 79 mode = O_RDWR; 80 else panic("Impossible mode in open_file"); 81 82 if (append) 83 mode |= O_APPEND; 84 fd = open64(path, mode); 85 if (fd < 0) 86 return -errno; 87 else return fd; 88 } 89 90 void *open_dir(char *path, int *err_out) 91 { 92 DIR *dir; 93 94 dir = opendir(path); 95 *err_out = errno; 96 97 return dir; 98 } 99 100 void seek_dir(void *stream, unsigned long long pos) 101 { 102 DIR *dir = stream; 103 104 seekdir(dir, pos); 105 } 106 107 char *read_dir(void *stream, unsigned long long *pos_out, 108 unsigned long long *ino_out, int *len_out, 109 unsigned int *type_out) 110 { 111 DIR *dir = stream; 112 struct dirent *ent; 113 114 ent = readdir(dir); 115 if (ent == NULL) 116 return NULL; 117 *len_out = strlen(ent->d_name); 118 *ino_out = ent->d_ino; 119 *type_out = ent->d_type; 120 *pos_out = ent->d_off; 121 return ent->d_name; 122 } 123 124 int read_file(int fd, unsigned long long *offset, char *buf, int len) 125 { 126 int n; 127 128 n = pread64(fd, buf, len, *offset); 129 if (n < 0) 130 return -errno; 131 *offset += n; 132 return n; 133 } 134 135 int write_file(int fd, unsigned long long *offset, const char *buf, int len) 136 { 137 int n; 138 139 n = pwrite64(fd, buf, len, *offset); 140 if (n < 0) 141 return -errno; 142 *offset += n; 143 return n; 144 } 145 146 int lseek_file(int fd, long long offset, int whence) 147 { 148 int ret; 149 150 ret = lseek64(fd, offset, whence); 151 if (ret < 0) 152 return -errno; 153 return 0; 154 } 155 156 int fsync_file(int fd, int datasync) 157 { 158 int ret; 159 if (datasync) 160 ret = fdatasync(fd); 161 else 162 ret = fsync(fd); 163 164 if (ret < 0) 165 return -errno; 166 return 0; 167 } 168 169 int replace_file(int oldfd, int fd) 170 { 171 return dup2(oldfd, fd); 172 } 173 174 void close_file(void *stream) 175 { 176 close(*((int *) stream)); 177 } 178 179 void close_dir(void *stream) 180 { 181 closedir(stream); 182 } 183 184 int file_create(char *name, int mode) 185 { 186 int fd; 187 188 fd = open64(name, O_CREAT | O_RDWR, mode); 189 if (fd < 0) 190 return -errno; 191 return fd; 192 } 193 194 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd) 195 { 196 struct hostfs_stat st; 197 struct timeval times[2]; 198 int err, ma; 199 200 if (attrs->ia_valid & HOSTFS_ATTR_MODE) { 201 if (fd >= 0) { 202 if (fchmod(fd, attrs->ia_mode) != 0) 203 return -errno; 204 } else if (chmod(file, attrs->ia_mode) != 0) { 205 return -errno; 206 } 207 } 208 if (attrs->ia_valid & HOSTFS_ATTR_UID) { 209 if (fd >= 0) { 210 if (fchown(fd, attrs->ia_uid, -1)) 211 return -errno; 212 } else if (chown(file, attrs->ia_uid, -1)) { 213 return -errno; 214 } 215 } 216 if (attrs->ia_valid & HOSTFS_ATTR_GID) { 217 if (fd >= 0) { 218 if (fchown(fd, -1, attrs->ia_gid)) 219 return -errno; 220 } else if (chown(file, -1, attrs->ia_gid)) { 221 return -errno; 222 } 223 } 224 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) { 225 if (fd >= 0) { 226 if (ftruncate(fd, attrs->ia_size)) 227 return -errno; 228 } else if (truncate(file, attrs->ia_size)) { 229 return -errno; 230 } 231 } 232 233 /* 234 * Update accessed and/or modified time, in two parts: first set 235 * times according to the changes to perform, and then call futimes() 236 * or utimes() to apply them. 237 */ 238 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET); 239 if (attrs->ia_valid & ma) { 240 err = stat_file(file, &st, fd); 241 if (err != 0) 242 return err; 243 244 times[0].tv_sec = st.atime.tv_sec; 245 times[0].tv_usec = st.atime.tv_nsec / 1000; 246 times[1].tv_sec = st.mtime.tv_sec; 247 times[1].tv_usec = st.mtime.tv_nsec / 1000; 248 249 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) { 250 times[0].tv_sec = attrs->ia_atime.tv_sec; 251 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000; 252 } 253 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) { 254 times[1].tv_sec = attrs->ia_mtime.tv_sec; 255 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000; 256 } 257 258 if (fd >= 0) { 259 if (futimes(fd, times) != 0) 260 return -errno; 261 } else if (utimes(file, times) != 0) { 262 return -errno; 263 } 264 } 265 266 /* Note: ctime is not handled */ 267 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) { 268 err = stat_file(file, &st, fd); 269 attrs->ia_atime = st.atime; 270 attrs->ia_mtime = st.mtime; 271 if (err != 0) 272 return err; 273 } 274 return 0; 275 } 276 277 int make_symlink(const char *from, const char *to) 278 { 279 int err; 280 281 err = symlink(to, from); 282 if (err) 283 return -errno; 284 return 0; 285 } 286 287 int unlink_file(const char *file) 288 { 289 int err; 290 291 err = unlink(file); 292 if (err) 293 return -errno; 294 return 0; 295 } 296 297 int do_mkdir(const char *file, int mode) 298 { 299 int err; 300 301 err = mkdir(file, mode); 302 if (err) 303 return -errno; 304 return 0; 305 } 306 307 int hostfs_do_rmdir(const char *file) 308 { 309 int err; 310 311 err = rmdir(file); 312 if (err) 313 return -errno; 314 return 0; 315 } 316 317 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor) 318 { 319 int err; 320 321 err = mknod(file, mode, os_makedev(major, minor)); 322 if (err) 323 return -errno; 324 return 0; 325 } 326 327 int link_file(const char *to, const char *from) 328 { 329 int err; 330 331 err = link(to, from); 332 if (err) 333 return -errno; 334 return 0; 335 } 336 337 int hostfs_do_readlink(char *file, char *buf, int size) 338 { 339 int n; 340 341 n = readlink(file, buf, size); 342 if (n < 0) 343 return -errno; 344 if (n < size) 345 buf[n] = '\0'; 346 return n; 347 } 348 349 int rename_file(char *from, char *to) 350 { 351 int err; 352 353 err = rename(from, to); 354 if (err < 0) 355 return -errno; 356 return 0; 357 } 358 359 int rename2_file(char *from, char *to, unsigned int flags) 360 { 361 int err; 362 363 #ifndef SYS_renameat2 364 # ifdef __x86_64__ 365 # define SYS_renameat2 316 366 # endif 367 # ifdef __i386__ 368 # define SYS_renameat2 353 369 # endif 370 #endif 371 372 #ifdef SYS_renameat2 373 err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags); 374 if (err < 0) { 375 if (errno != ENOSYS) 376 return -errno; 377 else 378 return -EINVAL; 379 } 380 return 0; 381 #else 382 return -EINVAL; 383 #endif 384 } 385 386 int do_statfs(char *root, long *bsize_out, long long *blocks_out, 387 long long *bfree_out, long long *bavail_out, 388 long long *files_out, long long *ffree_out, 389 void *fsid_out, int fsid_size, long *namelen_out) 390 { 391 struct statfs64 buf; 392 int err; 393 394 err = statfs64(root, &buf); 395 if (err < 0) 396 return -errno; 397 398 *bsize_out = buf.f_bsize; 399 *blocks_out = buf.f_blocks; 400 *bfree_out = buf.f_bfree; 401 *bavail_out = buf.f_bavail; 402 *files_out = buf.f_files; 403 *ffree_out = buf.f_ffree; 404 memcpy(fsid_out, &buf.f_fsid, 405 sizeof(buf.f_fsid) > fsid_size ? fsid_size : 406 sizeof(buf.f_fsid)); 407 *namelen_out = buf.f_namelen; 408 409 return 0; 410 } 411