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 p->dev = buf->st_dev; 40 } 41 42 int stat_file(const char *path, struct hostfs_stat *p, int fd) 43 { 44 struct stat64 buf; 45 46 if (fd >= 0) { 47 if (fstat64(fd, &buf) < 0) 48 return -errno; 49 } else if (lstat64(path, &buf) < 0) { 50 return -errno; 51 } 52 stat64_to_hostfs(&buf, p); 53 return 0; 54 } 55 56 int access_file(char *path, int r, int w, int x) 57 { 58 int mode = 0; 59 60 if (r) 61 mode = R_OK; 62 if (w) 63 mode |= W_OK; 64 if (x) 65 mode |= X_OK; 66 if (access(path, mode) != 0) 67 return -errno; 68 else return 0; 69 } 70 71 int open_file(char *path, int r, int w, int append) 72 { 73 int mode = 0, fd; 74 75 if (r && !w) 76 mode = O_RDONLY; 77 else if (!r && w) 78 mode = O_WRONLY; 79 else if (r && w) 80 mode = O_RDWR; 81 else panic("Impossible mode in open_file"); 82 83 if (append) 84 mode |= O_APPEND; 85 fd = open64(path, mode); 86 if (fd < 0) 87 return -errno; 88 else return fd; 89 } 90 91 void *open_dir(char *path, int *err_out) 92 { 93 DIR *dir; 94 95 dir = opendir(path); 96 *err_out = errno; 97 98 return dir; 99 } 100 101 void seek_dir(void *stream, unsigned long long pos) 102 { 103 DIR *dir = stream; 104 105 seekdir(dir, pos); 106 } 107 108 char *read_dir(void *stream, unsigned long long *pos_out, 109 unsigned long long *ino_out, int *len_out, 110 unsigned int *type_out) 111 { 112 DIR *dir = stream; 113 struct dirent *ent; 114 115 ent = readdir(dir); 116 if (ent == NULL) 117 return NULL; 118 *len_out = strlen(ent->d_name); 119 *ino_out = ent->d_ino; 120 *type_out = ent->d_type; 121 *pos_out = ent->d_off; 122 return ent->d_name; 123 } 124 125 int read_file(int fd, unsigned long long *offset, char *buf, int len) 126 { 127 int n; 128 129 n = pread64(fd, buf, len, *offset); 130 if (n < 0) 131 return -errno; 132 *offset += n; 133 return n; 134 } 135 136 int write_file(int fd, unsigned long long *offset, const char *buf, int len) 137 { 138 int n; 139 140 n = pwrite64(fd, buf, len, *offset); 141 if (n < 0) 142 return -errno; 143 *offset += n; 144 return n; 145 } 146 147 int lseek_file(int fd, long long offset, int whence) 148 { 149 int ret; 150 151 ret = lseek64(fd, offset, whence); 152 if (ret < 0) 153 return -errno; 154 return 0; 155 } 156 157 int fsync_file(int fd, int datasync) 158 { 159 int ret; 160 if (datasync) 161 ret = fdatasync(fd); 162 else 163 ret = fsync(fd); 164 165 if (ret < 0) 166 return -errno; 167 return 0; 168 } 169 170 int replace_file(int oldfd, int fd) 171 { 172 return dup2(oldfd, fd); 173 } 174 175 void close_file(void *stream) 176 { 177 close(*((int *) stream)); 178 } 179 180 void close_dir(void *stream) 181 { 182 closedir(stream); 183 } 184 185 int file_create(char *name, int mode) 186 { 187 int fd; 188 189 fd = open64(name, O_CREAT | O_RDWR, mode); 190 if (fd < 0) 191 return -errno; 192 return fd; 193 } 194 195 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd) 196 { 197 struct hostfs_stat st; 198 struct timeval times[2]; 199 int err, ma; 200 201 if (attrs->ia_valid & HOSTFS_ATTR_MODE) { 202 if (fd >= 0) { 203 if (fchmod(fd, attrs->ia_mode) != 0) 204 return -errno; 205 } else if (chmod(file, attrs->ia_mode) != 0) { 206 return -errno; 207 } 208 } 209 if (attrs->ia_valid & HOSTFS_ATTR_UID) { 210 if (fd >= 0) { 211 if (fchown(fd, attrs->ia_uid, -1)) 212 return -errno; 213 } else if (chown(file, attrs->ia_uid, -1)) { 214 return -errno; 215 } 216 } 217 if (attrs->ia_valid & HOSTFS_ATTR_GID) { 218 if (fd >= 0) { 219 if (fchown(fd, -1, attrs->ia_gid)) 220 return -errno; 221 } else if (chown(file, -1, attrs->ia_gid)) { 222 return -errno; 223 } 224 } 225 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) { 226 if (fd >= 0) { 227 if (ftruncate(fd, attrs->ia_size)) 228 return -errno; 229 } else if (truncate(file, attrs->ia_size)) { 230 return -errno; 231 } 232 } 233 234 /* 235 * Update accessed and/or modified time, in two parts: first set 236 * times according to the changes to perform, and then call futimes() 237 * or utimes() to apply them. 238 */ 239 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET); 240 if (attrs->ia_valid & ma) { 241 err = stat_file(file, &st, fd); 242 if (err != 0) 243 return err; 244 245 times[0].tv_sec = st.atime.tv_sec; 246 times[0].tv_usec = st.atime.tv_nsec / 1000; 247 times[1].tv_sec = st.mtime.tv_sec; 248 times[1].tv_usec = st.mtime.tv_nsec / 1000; 249 250 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) { 251 times[0].tv_sec = attrs->ia_atime.tv_sec; 252 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000; 253 } 254 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) { 255 times[1].tv_sec = attrs->ia_mtime.tv_sec; 256 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000; 257 } 258 259 if (fd >= 0) { 260 if (futimes(fd, times) != 0) 261 return -errno; 262 } else if (utimes(file, times) != 0) { 263 return -errno; 264 } 265 } 266 267 /* Note: ctime is not handled */ 268 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) { 269 err = stat_file(file, &st, fd); 270 attrs->ia_atime = st.atime; 271 attrs->ia_mtime = st.mtime; 272 if (err != 0) 273 return err; 274 } 275 return 0; 276 } 277 278 int make_symlink(const char *from, const char *to) 279 { 280 int err; 281 282 err = symlink(to, from); 283 if (err) 284 return -errno; 285 return 0; 286 } 287 288 int unlink_file(const char *file) 289 { 290 int err; 291 292 err = unlink(file); 293 if (err) 294 return -errno; 295 return 0; 296 } 297 298 int do_mkdir(const char *file, int mode) 299 { 300 int err; 301 302 err = mkdir(file, mode); 303 if (err) 304 return -errno; 305 return 0; 306 } 307 308 int hostfs_do_rmdir(const char *file) 309 { 310 int err; 311 312 err = rmdir(file); 313 if (err) 314 return -errno; 315 return 0; 316 } 317 318 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor) 319 { 320 int err; 321 322 err = mknod(file, mode, os_makedev(major, minor)); 323 if (err) 324 return -errno; 325 return 0; 326 } 327 328 int link_file(const char *to, const char *from) 329 { 330 int err; 331 332 err = link(to, from); 333 if (err) 334 return -errno; 335 return 0; 336 } 337 338 int hostfs_do_readlink(char *file, char *buf, int size) 339 { 340 int n; 341 342 n = readlink(file, buf, size); 343 if (n < 0) 344 return -errno; 345 if (n < size) 346 buf[n] = '\0'; 347 return n; 348 } 349 350 int rename_file(char *from, char *to) 351 { 352 int err; 353 354 err = rename(from, to); 355 if (err < 0) 356 return -errno; 357 return 0; 358 } 359 360 int rename2_file(char *from, char *to, unsigned int flags) 361 { 362 int err; 363 364 #ifndef SYS_renameat2 365 # ifdef __x86_64__ 366 # define SYS_renameat2 316 367 # endif 368 # ifdef __i386__ 369 # define SYS_renameat2 353 370 # endif 371 #endif 372 373 #ifdef SYS_renameat2 374 err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags); 375 if (err < 0) { 376 if (errno != ENOSYS) 377 return -errno; 378 else 379 return -EINVAL; 380 } 381 return 0; 382 #else 383 return -EINVAL; 384 #endif 385 } 386 387 int do_statfs(char *root, long *bsize_out, long long *blocks_out, 388 long long *bfree_out, long long *bavail_out, 389 long long *files_out, long long *ffree_out, 390 void *fsid_out, int fsid_size, long *namelen_out) 391 { 392 struct statfs64 buf; 393 int err; 394 395 err = statfs64(root, &buf); 396 if (err < 0) 397 return -errno; 398 399 *bsize_out = buf.f_bsize; 400 *blocks_out = buf.f_blocks; 401 *bfree_out = buf.f_bfree; 402 *bavail_out = buf.f_bavail; 403 *files_out = buf.f_files; 404 *ffree_out = buf.f_ffree; 405 memcpy(fsid_out, &buf.f_fsid, 406 sizeof(buf.f_fsid) > fsid_size ? fsid_size : 407 sizeof(buf.f_fsid)); 408 *namelen_out = buf.f_namelen; 409 410 return 0; 411 } 412