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 "user.h" 20#include <utime.h> 21 22static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p) 23{ 24 p->ino = buf->st_ino; 25 p->mode = buf->st_mode; 26 p->nlink = buf->st_nlink; 27 p->uid = buf->st_uid; 28 p->gid = buf->st_gid; 29 p->size = buf->st_size; 30 p->atime.tv_sec = buf->st_atime; 31 p->atime.tv_nsec = 0; 32 p->ctime.tv_sec = buf->st_ctime; 33 p->ctime.tv_nsec = 0; 34 p->mtime.tv_sec = buf->st_mtime; 35 p->mtime.tv_nsec = 0; 36 p->blksize = buf->st_blksize; 37 p->blocks = buf->st_blocks; 38 p->maj = os_major(buf->st_rdev); 39 p->min = os_minor(buf->st_rdev); 40} 41 42int 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 56int 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 71int 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 91void *open_dir(char *path, int *err_out) 92{ 93 DIR *dir; 94 95 dir = opendir(path); 96 *err_out = errno; 97 if (dir == NULL) 98 return NULL; 99 return dir; 100} 101 102char *read_dir(void *stream, unsigned long long *pos, 103 unsigned long long *ino_out, int *len_out) 104{ 105 DIR *dir = stream; 106 struct dirent *ent; 107 108 seekdir(dir, *pos); 109 ent = readdir(dir); 110 if (ent == NULL) 111 return NULL; 112 *len_out = strlen(ent->d_name); 113 *ino_out = ent->d_ino; 114 *pos = telldir(dir); 115 return ent->d_name; 116} 117 118int 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 129int 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 140int 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 150int 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 163int replace_file(int oldfd, int fd) 164{ 165 return dup2(oldfd, fd); 166} 167 168void close_file(void *stream) 169{ 170 close(*((int *) stream)); 171} 172 173void close_dir(void *stream) 174{ 175 closedir(stream); 176} 177 178int 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 199int 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 282int 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 292int 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 302int 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 312int 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 322int 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 332int 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 342int 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 354int 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 364int do_statfs(char *root, long *bsize_out, long long *blocks_out, 365 long long *bfree_out, long long *bavail_out, 366 long long *files_out, long long *ffree_out, 367 void *fsid_out, int fsid_size, long *namelen_out) 368{ 369 struct statfs64 buf; 370 int err; 371 372 err = statfs64(root, &buf); 373 if (err < 0) 374 return -errno; 375 376 *bsize_out = buf.f_bsize; 377 *blocks_out = buf.f_blocks; 378 *bfree_out = buf.f_bfree; 379 *bavail_out = buf.f_bavail; 380 *files_out = buf.f_files; 381 *ffree_out = buf.f_ffree; 382 memcpy(fsid_out, &buf.f_fsid, 383 sizeof(buf.f_fsid) > fsid_size ? fsid_size : 384 sizeof(buf.f_fsid)); 385 *namelen_out = buf.f_namelen; 386 387 return 0; 388} 389