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