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 char *read_dir(void *stream, unsigned long long *pos, 101 unsigned long long *ino_out, int *len_out, 102 unsigned int *type_out) 103 { 104 DIR *dir = stream; 105 struct dirent *ent; 106 107 seekdir(dir, *pos); 108 ent = readdir(dir); 109 if (ent == NULL) 110 return NULL; 111 *len_out = strlen(ent->d_name); 112 *ino_out = ent->d_ino; 113 *type_out = ent->d_type; 114 *pos = telldir(dir); 115 return ent->d_name; 116 } 117 118 int read_file(int fd, unsigned long long *offset, char *buf, int len) 119 { 120 int n; 121 122 n = pread64(fd, buf, len, *offset); 123 if (n < 0) 124 return -errno; 125 *offset += n; 126 return n; 127 } 128 129 int write_file(int fd, unsigned long long *offset, const char *buf, int len) 130 { 131 int n; 132 133 n = pwrite64(fd, buf, len, *offset); 134 if (n < 0) 135 return -errno; 136 *offset += n; 137 return n; 138 } 139 140 int lseek_file(int fd, long long offset, int whence) 141 { 142 int ret; 143 144 ret = lseek64(fd, offset, whence); 145 if (ret < 0) 146 return -errno; 147 return 0; 148 } 149 150 int fsync_file(int fd, int datasync) 151 { 152 int ret; 153 if (datasync) 154 ret = fdatasync(fd); 155 else 156 ret = fsync(fd); 157 158 if (ret < 0) 159 return -errno; 160 return 0; 161 } 162 163 int replace_file(int oldfd, int fd) 164 { 165 return dup2(oldfd, fd); 166 } 167 168 void close_file(void *stream) 169 { 170 close(*((int *) stream)); 171 } 172 173 void close_dir(void *stream) 174 { 175 closedir(stream); 176 } 177 178 int file_create(char *name, int ur, int uw, int ux, int gr, 179 int gw, int gx, int or, int ow, int ox) 180 { 181 int mode, fd; 182 183 mode = 0; 184 mode |= ur ? S_IRUSR : 0; 185 mode |= uw ? S_IWUSR : 0; 186 mode |= ux ? S_IXUSR : 0; 187 mode |= gr ? S_IRGRP : 0; 188 mode |= gw ? S_IWGRP : 0; 189 mode |= gx ? S_IXGRP : 0; 190 mode |= or ? S_IROTH : 0; 191 mode |= ow ? S_IWOTH : 0; 192 mode |= ox ? S_IXOTH : 0; 193 fd = open64(name, O_CREAT | O_RDWR, mode); 194 if (fd < 0) 195 return -errno; 196 return fd; 197 } 198 199 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd) 200 { 201 struct hostfs_stat st; 202 struct timeval times[2]; 203 int err, ma; 204 205 if (attrs->ia_valid & HOSTFS_ATTR_MODE) { 206 if (fd >= 0) { 207 if (fchmod(fd, attrs->ia_mode) != 0) 208 return -errno; 209 } else if (chmod(file, attrs->ia_mode) != 0) { 210 return -errno; 211 } 212 } 213 if (attrs->ia_valid & HOSTFS_ATTR_UID) { 214 if (fd >= 0) { 215 if (fchown(fd, attrs->ia_uid, -1)) 216 return -errno; 217 } else if (chown(file, attrs->ia_uid, -1)) { 218 return -errno; 219 } 220 } 221 if (attrs->ia_valid & HOSTFS_ATTR_GID) { 222 if (fd >= 0) { 223 if (fchown(fd, -1, attrs->ia_gid)) 224 return -errno; 225 } else if (chown(file, -1, attrs->ia_gid)) { 226 return -errno; 227 } 228 } 229 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) { 230 if (fd >= 0) { 231 if (ftruncate(fd, attrs->ia_size)) 232 return -errno; 233 } else if (truncate(file, attrs->ia_size)) { 234 return -errno; 235 } 236 } 237 238 /* 239 * Update accessed and/or modified time, in two parts: first set 240 * times according to the changes to perform, and then call futimes() 241 * or utimes() to apply them. 242 */ 243 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET); 244 if (attrs->ia_valid & ma) { 245 err = stat_file(file, &st, fd); 246 if (err != 0) 247 return err; 248 249 times[0].tv_sec = st.atime.tv_sec; 250 times[0].tv_usec = st.atime.tv_nsec / 1000; 251 times[1].tv_sec = st.mtime.tv_sec; 252 times[1].tv_usec = st.mtime.tv_nsec / 1000; 253 254 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) { 255 times[0].tv_sec = attrs->ia_atime.tv_sec; 256 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000; 257 } 258 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) { 259 times[1].tv_sec = attrs->ia_mtime.tv_sec; 260 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000; 261 } 262 263 if (fd >= 0) { 264 if (futimes(fd, times) != 0) 265 return -errno; 266 } else if (utimes(file, times) != 0) { 267 return -errno; 268 } 269 } 270 271 /* Note: ctime is not handled */ 272 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) { 273 err = stat_file(file, &st, fd); 274 attrs->ia_atime = st.atime; 275 attrs->ia_mtime = st.mtime; 276 if (err != 0) 277 return err; 278 } 279 return 0; 280 } 281 282 int make_symlink(const char *from, const char *to) 283 { 284 int err; 285 286 err = symlink(to, from); 287 if (err) 288 return -errno; 289 return 0; 290 } 291 292 int unlink_file(const char *file) 293 { 294 int err; 295 296 err = unlink(file); 297 if (err) 298 return -errno; 299 return 0; 300 } 301 302 int do_mkdir(const char *file, int mode) 303 { 304 int err; 305 306 err = mkdir(file, mode); 307 if (err) 308 return -errno; 309 return 0; 310 } 311 312 int do_rmdir(const char *file) 313 { 314 int err; 315 316 err = rmdir(file); 317 if (err) 318 return -errno; 319 return 0; 320 } 321 322 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor) 323 { 324 int err; 325 326 err = mknod(file, mode, os_makedev(major, minor)); 327 if (err) 328 return -errno; 329 return 0; 330 } 331 332 int link_file(const char *to, const char *from) 333 { 334 int err; 335 336 err = link(to, from); 337 if (err) 338 return -errno; 339 return 0; 340 } 341 342 int hostfs_do_readlink(char *file, char *buf, int size) 343 { 344 int n; 345 346 n = readlink(file, buf, size); 347 if (n < 0) 348 return -errno; 349 if (n < size) 350 buf[n] = '\0'; 351 return n; 352 } 353 354 int rename_file(char *from, char *to) 355 { 356 int err; 357 358 err = rename(from, to); 359 if (err < 0) 360 return -errno; 361 return 0; 362 } 363 364 int rename2_file(char *from, char *to, unsigned int flags) 365 { 366 int err; 367 368 #ifndef SYS_renameat2 369 # ifdef __x86_64__ 370 # define SYS_renameat2 316 371 # endif 372 # ifdef __i386__ 373 # define SYS_renameat2 353 374 # endif 375 #endif 376 377 #ifdef SYS_renameat2 378 err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags); 379 if (err < 0) { 380 if (errno != ENOSYS) 381 return -errno; 382 else 383 return -EINVAL; 384 } 385 return 0; 386 #else 387 return -EINVAL; 388 #endif 389 } 390 391 int do_statfs(char *root, long *bsize_out, long long *blocks_out, 392 long long *bfree_out, long long *bavail_out, 393 long long *files_out, long long *ffree_out, 394 void *fsid_out, int fsid_size, long *namelen_out) 395 { 396 struct statfs64 buf; 397 int err; 398 399 err = statfs64(root, &buf); 400 if (err < 0) 401 return -errno; 402 403 *bsize_out = buf.f_bsize; 404 *blocks_out = buf.f_blocks; 405 *bfree_out = buf.f_bfree; 406 *bavail_out = buf.f_bavail; 407 *files_out = buf.f_files; 408 *ffree_out = buf.f_ffree; 409 memcpy(fsid_out, &buf.f_fsid, 410 sizeof(buf.f_fsid) > fsid_size ? fsid_size : 411 sizeof(buf.f_fsid)); 412 *namelen_out = buf.f_namelen; 413 414 return 0; 415 } 416