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->rdev.maj = os_major(buf->st_rdev); 38 p->rdev.min = os_minor(buf->st_rdev); 39 p->dev.maj = os_major(buf->st_dev); 40 p->dev.min = os_minor(buf->st_dev); 41 } 42 43 int stat_file(const char *path, struct hostfs_stat *p, int fd) 44 { 45 struct stat64 buf; 46 47 if (fd >= 0) { 48 if (fstat64(fd, &buf) < 0) 49 return -errno; 50 } else if (lstat64(path, &buf) < 0) { 51 return -errno; 52 } 53 stat64_to_hostfs(&buf, p); 54 return 0; 55 } 56 57 int access_file(char *path, int r, int w, int x) 58 { 59 int mode = 0; 60 61 if (r) 62 mode = R_OK; 63 if (w) 64 mode |= W_OK; 65 if (x) 66 mode |= X_OK; 67 if (access(path, mode) != 0) 68 return -errno; 69 else return 0; 70 } 71 72 int open_file(char *path, int r, int w, int append) 73 { 74 int mode = 0, fd; 75 76 if (r && !w) 77 mode = O_RDONLY; 78 else if (!r && w) 79 mode = O_WRONLY; 80 else if (r && w) 81 mode = O_RDWR; 82 else panic("Impossible mode in open_file"); 83 84 if (append) 85 mode |= O_APPEND; 86 fd = open64(path, mode); 87 if (fd < 0) 88 return -errno; 89 else return fd; 90 } 91 92 void *open_dir(char *path, int *err_out) 93 { 94 DIR *dir; 95 96 dir = opendir(path); 97 *err_out = errno; 98 99 return dir; 100 } 101 102 void seek_dir(void *stream, unsigned long long pos) 103 { 104 DIR *dir = stream; 105 106 seekdir(dir, pos); 107 } 108 109 char *read_dir(void *stream, unsigned long long *pos_out, 110 unsigned long long *ino_out, int *len_out, 111 unsigned int *type_out) 112 { 113 DIR *dir = stream; 114 struct dirent *ent; 115 116 ent = readdir(dir); 117 if (ent == NULL) 118 return NULL; 119 *len_out = strlen(ent->d_name); 120 *ino_out = ent->d_ino; 121 *type_out = ent->d_type; 122 *pos_out = ent->d_off; 123 return ent->d_name; 124 } 125 126 int read_file(int fd, unsigned long long *offset, char *buf, int len) 127 { 128 int n; 129 130 n = pread64(fd, buf, len, *offset); 131 if (n < 0) 132 return -errno; 133 *offset += n; 134 return n; 135 } 136 137 int write_file(int fd, unsigned long long *offset, const char *buf, int len) 138 { 139 int n; 140 141 n = pwrite64(fd, buf, len, *offset); 142 if (n < 0) 143 return -errno; 144 *offset += n; 145 return n; 146 } 147 148 int lseek_file(int fd, long long offset, int whence) 149 { 150 int ret; 151 152 ret = lseek64(fd, offset, whence); 153 if (ret < 0) 154 return -errno; 155 return 0; 156 } 157 158 int fsync_file(int fd, int datasync) 159 { 160 int ret; 161 if (datasync) 162 ret = fdatasync(fd); 163 else 164 ret = fsync(fd); 165 166 if (ret < 0) 167 return -errno; 168 return 0; 169 } 170 171 int replace_file(int oldfd, int fd) 172 { 173 return dup2(oldfd, fd); 174 } 175 176 void close_file(void *stream) 177 { 178 close(*((int *) stream)); 179 } 180 181 void close_dir(void *stream) 182 { 183 closedir(stream); 184 } 185 186 int file_create(char *name, int mode) 187 { 188 int fd; 189 190 fd = open64(name, O_CREAT | O_RDWR, mode); 191 if (fd < 0) 192 return -errno; 193 return fd; 194 } 195 196 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd) 197 { 198 struct hostfs_stat st; 199 struct timeval times[2]; 200 int err, ma; 201 202 if (attrs->ia_valid & HOSTFS_ATTR_MODE) { 203 if (fd >= 0) { 204 if (fchmod(fd, attrs->ia_mode) != 0) 205 return -errno; 206 } else if (chmod(file, attrs->ia_mode) != 0) { 207 return -errno; 208 } 209 } 210 if (attrs->ia_valid & HOSTFS_ATTR_UID) { 211 if (fd >= 0) { 212 if (fchown(fd, attrs->ia_uid, -1)) 213 return -errno; 214 } else if (chown(file, attrs->ia_uid, -1)) { 215 return -errno; 216 } 217 } 218 if (attrs->ia_valid & HOSTFS_ATTR_GID) { 219 if (fd >= 0) { 220 if (fchown(fd, -1, attrs->ia_gid)) 221 return -errno; 222 } else if (chown(file, -1, attrs->ia_gid)) { 223 return -errno; 224 } 225 } 226 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) { 227 if (fd >= 0) { 228 if (ftruncate(fd, attrs->ia_size)) 229 return -errno; 230 } else if (truncate(file, attrs->ia_size)) { 231 return -errno; 232 } 233 } 234 235 /* 236 * Update accessed and/or modified time, in two parts: first set 237 * times according to the changes to perform, and then call futimes() 238 * or utimes() to apply them. 239 */ 240 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET); 241 if (attrs->ia_valid & ma) { 242 err = stat_file(file, &st, fd); 243 if (err != 0) 244 return err; 245 246 times[0].tv_sec = st.atime.tv_sec; 247 times[0].tv_usec = st.atime.tv_nsec / 1000; 248 times[1].tv_sec = st.mtime.tv_sec; 249 times[1].tv_usec = st.mtime.tv_nsec / 1000; 250 251 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) { 252 times[0].tv_sec = attrs->ia_atime.tv_sec; 253 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000; 254 } 255 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) { 256 times[1].tv_sec = attrs->ia_mtime.tv_sec; 257 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000; 258 } 259 260 if (fd >= 0) { 261 if (futimes(fd, times) != 0) 262 return -errno; 263 } else if (utimes(file, times) != 0) { 264 return -errno; 265 } 266 } 267 268 /* Note: ctime is not handled */ 269 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) { 270 err = stat_file(file, &st, fd); 271 attrs->ia_atime = st.atime; 272 attrs->ia_mtime = st.mtime; 273 if (err != 0) 274 return err; 275 } 276 return 0; 277 } 278 279 int make_symlink(const char *from, const char *to) 280 { 281 int err; 282 283 err = symlink(to, from); 284 if (err) 285 return -errno; 286 return 0; 287 } 288 289 int unlink_file(const char *file) 290 { 291 int err; 292 293 err = unlink(file); 294 if (err) 295 return -errno; 296 return 0; 297 } 298 299 int do_mkdir(const char *file, int mode) 300 { 301 int err; 302 303 err = mkdir(file, mode); 304 if (err) 305 return -errno; 306 return 0; 307 } 308 309 int hostfs_do_rmdir(const char *file) 310 { 311 int err; 312 313 err = rmdir(file); 314 if (err) 315 return -errno; 316 return 0; 317 } 318 319 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor) 320 { 321 int err; 322 323 err = mknod(file, mode, os_makedev(major, minor)); 324 if (err) 325 return -errno; 326 return 0; 327 } 328 329 int link_file(const char *to, const char *from) 330 { 331 int err; 332 333 err = link(to, from); 334 if (err) 335 return -errno; 336 return 0; 337 } 338 339 int hostfs_do_readlink(char *file, char *buf, int size) 340 { 341 int n; 342 343 n = readlink(file, buf, size); 344 if (n < 0) 345 return -errno; 346 if (n < size) 347 buf[n] = '\0'; 348 return n; 349 } 350 351 int rename_file(char *from, char *to) 352 { 353 int err; 354 355 err = rename(from, to); 356 if (err < 0) 357 return -errno; 358 return 0; 359 } 360 361 int rename2_file(char *from, char *to, unsigned int flags) 362 { 363 int err; 364 365 #ifndef SYS_renameat2 366 # ifdef __x86_64__ 367 # define SYS_renameat2 316 368 # endif 369 # ifdef __i386__ 370 # define SYS_renameat2 353 371 # endif 372 #endif 373 374 #ifdef SYS_renameat2 375 err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags); 376 if (err < 0) { 377 if (errno != ENOSYS) 378 return -errno; 379 else 380 return -EINVAL; 381 } 382 return 0; 383 #else 384 return -EINVAL; 385 #endif 386 } 387 388 int do_statfs(char *root, long *bsize_out, long long *blocks_out, 389 long long *bfree_out, long long *bavail_out, 390 long long *files_out, long long *ffree_out, 391 void *fsid_out, int fsid_size, long *namelen_out) 392 { 393 struct statfs64 buf; 394 int err; 395 396 err = statfs64(root, &buf); 397 if (err < 0) 398 return -errno; 399 400 *bsize_out = buf.f_bsize; 401 *blocks_out = buf.f_blocks; 402 *bfree_out = buf.f_bfree; 403 *bavail_out = buf.f_bavail; 404 *files_out = buf.f_files; 405 *ffree_out = buf.f_ffree; 406 memcpy(fsid_out, &buf.f_fsid, 407 sizeof(buf.f_fsid) > fsid_size ? fsid_size : 408 sizeof(buf.f_fsid)); 409 *namelen_out = buf.f_namelen; 410 411 return 0; 412 } 413