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 "hostfs.h" 18 #include "os.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 { 103 DIR *dir = stream; 104 struct dirent *ent; 105 106 seekdir(dir, *pos); 107 ent = readdir(dir); 108 if (ent == NULL) 109 return NULL; 110 *len_out = strlen(ent->d_name); 111 *ino_out = ent->d_ino; 112 *pos = telldir(dir); 113 return ent->d_name; 114 } 115 116 int read_file(int fd, unsigned long long *offset, char *buf, int len) 117 { 118 int n; 119 120 n = pread64(fd, buf, len, *offset); 121 if (n < 0) 122 return -errno; 123 *offset += n; 124 return n; 125 } 126 127 int write_file(int fd, unsigned long long *offset, const char *buf, int len) 128 { 129 int n; 130 131 n = pwrite64(fd, buf, len, *offset); 132 if (n < 0) 133 return -errno; 134 *offset += n; 135 return n; 136 } 137 138 int lseek_file(int fd, long long offset, int whence) 139 { 140 int ret; 141 142 ret = lseek64(fd, offset, whence); 143 if (ret < 0) 144 return -errno; 145 return 0; 146 } 147 148 int fsync_file(int fd, int datasync) 149 { 150 int ret; 151 if (datasync) 152 ret = fdatasync(fd); 153 else 154 ret = fsync(fd); 155 156 if (ret < 0) 157 return -errno; 158 return 0; 159 } 160 161 int replace_file(int oldfd, int fd) 162 { 163 return dup2(oldfd, fd); 164 } 165 166 void close_file(void *stream) 167 { 168 close(*((int *) stream)); 169 } 170 171 void close_dir(void *stream) 172 { 173 closedir(stream); 174 } 175 176 int file_create(char *name, int ur, int uw, int ux, int gr, 177 int gw, int gx, int or, int ow, int ox) 178 { 179 int mode, fd; 180 181 mode = 0; 182 mode |= ur ? S_IRUSR : 0; 183 mode |= uw ? S_IWUSR : 0; 184 mode |= ux ? S_IXUSR : 0; 185 mode |= gr ? S_IRGRP : 0; 186 mode |= gw ? S_IWGRP : 0; 187 mode |= gx ? S_IXGRP : 0; 188 mode |= or ? S_IROTH : 0; 189 mode |= ow ? S_IWOTH : 0; 190 mode |= ox ? S_IXOTH : 0; 191 fd = open64(name, O_CREAT | O_RDWR, mode); 192 if (fd < 0) 193 return -errno; 194 return fd; 195 } 196 197 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd) 198 { 199 struct hostfs_stat st; 200 struct timeval times[2]; 201 int err, ma; 202 203 if (attrs->ia_valid & HOSTFS_ATTR_MODE) { 204 if (fd >= 0) { 205 if (fchmod(fd, attrs->ia_mode) != 0) 206 return -errno; 207 } else if (chmod(file, attrs->ia_mode) != 0) { 208 return -errno; 209 } 210 } 211 if (attrs->ia_valid & HOSTFS_ATTR_UID) { 212 if (fd >= 0) { 213 if (fchown(fd, attrs->ia_uid, -1)) 214 return -errno; 215 } else if (chown(file, attrs->ia_uid, -1)) { 216 return -errno; 217 } 218 } 219 if (attrs->ia_valid & HOSTFS_ATTR_GID) { 220 if (fd >= 0) { 221 if (fchown(fd, -1, attrs->ia_gid)) 222 return -errno; 223 } else if (chown(file, -1, attrs->ia_gid)) { 224 return -errno; 225 } 226 } 227 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) { 228 if (fd >= 0) { 229 if (ftruncate(fd, attrs->ia_size)) 230 return -errno; 231 } else if (truncate(file, attrs->ia_size)) { 232 return -errno; 233 } 234 } 235 236 /* 237 * Update accessed and/or modified time, in two parts: first set 238 * times according to the changes to perform, and then call futimes() 239 * or utimes() to apply them. 240 */ 241 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET); 242 if (attrs->ia_valid & ma) { 243 err = stat_file(file, &st, fd); 244 if (err != 0) 245 return err; 246 247 times[0].tv_sec = st.atime.tv_sec; 248 times[0].tv_usec = st.atime.tv_nsec / 1000; 249 times[1].tv_sec = st.mtime.tv_sec; 250 times[1].tv_usec = st.mtime.tv_nsec / 1000; 251 252 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) { 253 times[0].tv_sec = attrs->ia_atime.tv_sec; 254 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000; 255 } 256 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) { 257 times[1].tv_sec = attrs->ia_mtime.tv_sec; 258 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000; 259 } 260 261 if (fd >= 0) { 262 if (futimes(fd, times) != 0) 263 return -errno; 264 } else if (utimes(file, times) != 0) { 265 return -errno; 266 } 267 } 268 269 /* Note: ctime is not handled */ 270 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) { 271 err = stat_file(file, &st, fd); 272 attrs->ia_atime = st.atime; 273 attrs->ia_mtime = st.mtime; 274 if (err != 0) 275 return err; 276 } 277 return 0; 278 } 279 280 int make_symlink(const char *from, const char *to) 281 { 282 int err; 283 284 err = symlink(to, from); 285 if (err) 286 return -errno; 287 return 0; 288 } 289 290 int unlink_file(const char *file) 291 { 292 int err; 293 294 err = unlink(file); 295 if (err) 296 return -errno; 297 return 0; 298 } 299 300 int do_mkdir(const char *file, int mode) 301 { 302 int err; 303 304 err = mkdir(file, mode); 305 if (err) 306 return -errno; 307 return 0; 308 } 309 310 int do_rmdir(const char *file) 311 { 312 int err; 313 314 err = rmdir(file); 315 if (err) 316 return -errno; 317 return 0; 318 } 319 320 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor) 321 { 322 int err; 323 324 err = mknod(file, mode, os_makedev(major, minor)); 325 if (err) 326 return -errno; 327 return 0; 328 } 329 330 int link_file(const char *to, const char *from) 331 { 332 int err; 333 334 err = link(to, from); 335 if (err) 336 return -errno; 337 return 0; 338 } 339 340 int hostfs_do_readlink(char *file, char *buf, int size) 341 { 342 int n; 343 344 n = readlink(file, buf, size); 345 if (n < 0) 346 return -errno; 347 if (n < size) 348 buf[n] = '\0'; 349 return n; 350 } 351 352 int rename_file(char *from, char *to) 353 { 354 int err; 355 356 err = rename(from, to); 357 if (err < 0) 358 return -errno; 359 return 0; 360 } 361 362 int do_statfs(char *root, long *bsize_out, long long *blocks_out, 363 long long *bfree_out, long long *bavail_out, 364 long long *files_out, long long *ffree_out, 365 void *fsid_out, int fsid_size, long *namelen_out) 366 { 367 struct statfs64 buf; 368 int err; 369 370 err = statfs64(root, &buf); 371 if (err < 0) 372 return -errno; 373 374 *bsize_out = buf.f_bsize; 375 *blocks_out = buf.f_blocks; 376 *bfree_out = buf.f_bfree; 377 *bavail_out = buf.f_bavail; 378 *files_out = buf.f_files; 379 *ffree_out = buf.f_ffree; 380 memcpy(fsid_out, &buf.f_fsid, 381 sizeof(buf.f_fsid) > fsid_size ? fsid_size : 382 sizeof(buf.f_fsid)); 383 *namelen_out = buf.f_namelen; 384 385 return 0; 386 } 387