fs/hostfs/hostfs_user.c

   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
  22 int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
  23               int *nlink_out, int *uid_out, int *gid_out,
  24               unsigned long long *size_out, struct timespec *atime_out,
  25               struct timespec *mtime_out, struct timespec *ctime_out,
  26               int *blksize_out, unsigned long long *blocks_out, int fd)
  27 {
  28         struct stat64 buf;
  29
  30         if (fd >= 0) {
  31                 if (fstat64(fd, &buf) < 0)
  32                         return -errno;
  33         } else if (lstat64(path, &buf) < 0) {
  34                 return -errno;
  35         }
  36
  37         if (inode_out != NULL)
  38                 *inode_out = buf.st_ino;
  39         if (mode_out != NULL)
  40                 *mode_out = buf.st_mode;
  41         if (nlink_out != NULL)
  42                 *nlink_out = buf.st_nlink;
  43         if (uid_out != NULL)
  44                 *uid_out = buf.st_uid;
  45         if (gid_out != NULL)
  46                 *gid_out = buf.st_gid;
  47         if (size_out != NULL)
  48                 *size_out = buf.st_size;
  49         if (atime_out != NULL) {
  50                 atime_out->tv_sec = buf.st_atime;
  51                 atime_out->tv_nsec = 0;
  52         }
  53         if (mtime_out != NULL) {
  54                 mtime_out->tv_sec = buf.st_mtime;
  55                 mtime_out->tv_nsec = 0;
  56         }
  57         if (ctime_out != NULL) {
  58                 ctime_out->tv_sec = buf.st_ctime;
  59                 ctime_out->tv_nsec = 0;
  60         }
  61         if (blksize_out != NULL)
  62                 *blksize_out = buf.st_blksize;
  63         if (blocks_out != NULL)
  64                 *blocks_out = buf.st_blocks;
  65         return 0;
  66 }
  67
  68 int file_type(const char *path, int *maj, int *min)
  69 {
  70         struct stat64 buf;
  71
  72         if (lstat64(path, &buf) < 0)
  73                 return -errno;
  74         /*
  75          * We cannot pass rdev as is because glibc and the kernel disagree
  76          * about its definition.
  77          */
  78         if (maj != NULL)
  79                 *maj = major(buf.st_rdev);
  80         if (min != NULL)
  81                 *min = minor(buf.st_rdev);
  82
  83         if (S_ISDIR(buf.st_mode))
  84                 return OS_TYPE_DIR;
  85         else if (S_ISLNK(buf.st_mode))
  86                 return OS_TYPE_SYMLINK;
  87         else if (S_ISCHR(buf.st_mode))
  88                 return OS_TYPE_CHARDEV;
  89         else if (S_ISBLK(buf.st_mode))
  90                 return OS_TYPE_BLOCKDEV;
  91         else if (S_ISFIFO(buf.st_mode))
  92                 return OS_TYPE_FIFO;
  93         else if (S_ISSOCK(buf.st_mode))
  94                 return OS_TYPE_SOCK;
  95         else return OS_TYPE_FILE;
  96 }
  97
  98 int access_file(char *path, int r, int w, int x)
  99 {
 100         int mode = 0;
 101
 102         if (r)
 103                 mode = R_OK;
 104         if (w)
 105                 mode |= W_OK;
 106         if (x)
 107                 mode |= X_OK;
 108         if (access(path, mode) != 0)
 109                 return -errno;
 110         else return 0;
 111 }
 112
 113 int open_file(char *path, int r, int w, int append)
 114 {
 115         int mode = 0, fd;
 116
 117         if (r && !w)
 118                 mode = O_RDONLY;
 119         else if (!r && w)
 120                 mode = O_WRONLY;
 121         else if (r && w)
 122                 mode = O_RDWR;
 123         else panic("Impossible mode in open_file");
 124
 125         if (append)
 126                 mode |= O_APPEND;
 127         fd = open64(path, mode);
 128         if (fd < 0)
 129                 return -errno;
 130         else return fd;
 131 }
 132
 133 void *open_dir(char *path, int *err_out)
 134 {
 135         DIR *dir;
 136
 137         dir = opendir(path);
 138         *err_out = errno;
 139         if (dir == NULL)
 140                 return NULL;
 141         return dir;
 142 }
 143
 144 char *read_dir(void *stream, unsigned long long *pos,
 145                unsigned long long *ino_out, int *len_out)
 146 {
 147         DIR *dir = stream;
 148         struct dirent *ent;
 149
 150         seekdir(dir, *pos);
 151         ent = readdir(dir);
 152         if (ent == NULL)
 153                 return NULL;
 154         *len_out = strlen(ent->d_name);
 155         *ino_out = ent->d_ino;
 156         *pos = telldir(dir);
 157         return ent->d_name;
 158 }
 159
 160 int read_file(int fd, unsigned long long *offset, char *buf, int len)
 161 {
 162         int n;
 163
 164         n = pread64(fd, buf, len, *offset);
 165         if (n < 0)
 166                 return -errno;
 167         *offset += n;
 168         return n;
 169 }
 170
 171 int write_file(int fd, unsigned long long *offset, const char *buf, int len)
 172 {
 173         int n;
 174
 175         n = pwrite64(fd, buf, len, *offset);
 176         if (n < 0)
 177                 return -errno;
 178         *offset += n;
 179         return n;
 180 }
 181
 182 int lseek_file(int fd, long long offset, int whence)
 183 {
 184         int ret;
 185
 186         ret = lseek64(fd, offset, whence);
 187         if (ret < 0)
 188                 return -errno;
 189         return 0;
 190 }
 191
 192 int fsync_file(int fd, int datasync)
 193 {
 194         int ret;
 195         if (datasync)
 196                 ret = fdatasync(fd);
 197         else
 198                 ret = fsync(fd);
 199
 200         if (ret < 0)
 201                 return -errno;
 202         return 0;
 203 }
 204
 205 void close_file(void *stream)
 206 {
 207         close(*((int *) stream));
 208 }
 209
 210 void close_dir(void *stream)
 211 {
 212         closedir(stream);
 213 }
 214
 215 int file_create(char *name, int ur, int uw, int ux, int gr,
 216                 int gw, int gx, int or, int ow, int ox)
 217 {
 218         int mode, fd;
 219
 220         mode = 0;
 221         mode |= ur ? S_IRUSR : 0;
 222         mode |= uw ? S_IWUSR : 0;
 223         mode |= ux ? S_IXUSR : 0;
 224         mode |= gr ? S_IRGRP : 0;
 225         mode |= gw ? S_IWGRP : 0;
 226         mode |= gx ? S_IXGRP : 0;
 227         mode |= or ? S_IROTH : 0;
 228         mode |= ow ? S_IWOTH : 0;
 229         mode |= ox ? S_IXOTH : 0;
 230         fd = open64(name, O_CREAT | O_RDWR, mode);
 231         if (fd < 0)
 232                 return -errno;
 233         return fd;
 234 }
 235
 236 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
 237 {
 238         struct timeval times[2];
 239         struct timespec atime_ts, mtime_ts;
 240         int err, ma;
 241
 242         if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
 243                 if (fd >= 0) {
 244                         if (fchmod(fd, attrs->ia_mode) != 0)
 245                                 return (-errno);
 246                 } else if (chmod(file, attrs->ia_mode) != 0) {
 247                         return -errno;
 248                 }
 249         }
 250         if (attrs->ia_valid & HOSTFS_ATTR_UID) {
 251                 if (fd >= 0) {
 252                         if (fchown(fd, attrs->ia_uid, -1))
 253                                 return -errno;
 254                 } else if (chown(file, attrs->ia_uid, -1)) {
 255                         return -errno;
 256                 }
 257         }
 258         if (attrs->ia_valid & HOSTFS_ATTR_GID) {
 259                 if (fd >= 0) {
 260                         if (fchown(fd, -1, attrs->ia_gid))
 261                                 return -errno;
 262                 } else if (chown(file, -1, attrs->ia_gid)) {
 263                         return -errno;
 264                 }
 265         }
 266         if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
 267                 if (fd >= 0) {
 268                         if (ftruncate(fd, attrs->ia_size))
 269                                 return -errno;
 270                 } else if (truncate(file, attrs->ia_size)) {
 271                         return -errno;
 272                 }
 273         }
 274
 275         /*
 276          * Update accessed and/or modified time, in two parts: first set
 277          * times according to the changes to perform, and then call futimes()
 278          * or utimes() to apply them.
 279          */
 280         ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
 281         if (attrs->ia_valid & ma) {
 282                 err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
 283                                 &atime_ts, &mtime_ts, NULL, NULL, NULL, fd);
 284                 if (err != 0)
 285                         return err;
 286
 287                 times[0].tv_sec = atime_ts.tv_sec;
 288                 times[0].tv_usec = atime_ts.tv_nsec * 1000;
 289                 times[1].tv_sec = mtime_ts.tv_sec;
 290                 times[1].tv_usec = mtime_ts.tv_nsec * 1000;
 291
 292                 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
 293                         times[0].tv_sec = attrs->ia_atime.tv_sec;
 294                         times[0].tv_usec = attrs->ia_atime.tv_nsec * 1000;
 295                 }
 296                 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
 297                         times[1].tv_sec = attrs->ia_mtime.tv_sec;
 298                         times[1].tv_usec = attrs->ia_mtime.tv_nsec * 1000;
 299                 }
 300
 301                 if (fd >= 0) {
 302                         if (futimes(fd, times) != 0)
 303                                 return -errno;
 304                 } else if (utimes(file, times) != 0) {
 305                         return -errno;
 306                 }
 307         }
 308
 309         /* Note: ctime is not handled */
 310         if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
 311                 err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
 312                                 &attrs->ia_atime, &attrs->ia_mtime, NULL,
 313                                 NULL, NULL, fd);
 314                 if (err != 0)
 315                         return err;
 316         }
 317         return 0;
 318 }
 319
 320 int make_symlink(const char *from, const char *to)
 321 {
 322         int err;
 323
 324         err = symlink(to, from);
 325         if (err)
 326                 return -errno;
 327         return 0;
 328 }
 329
 330 int unlink_file(const char *file)
 331 {
 332         int err;
 333
 334         err = unlink(file);
 335         if (err)
 336                 return -errno;
 337         return 0;
 338 }
 339
 340 int do_mkdir(const char *file, int mode)
 341 {
 342         int err;
 343
 344         err = mkdir(file, mode);
 345         if (err)
 346                 return -errno;
 347         return 0;
 348 }
 349
 350 int do_rmdir(const char *file)
 351 {
 352         int err;
 353
 354         err = rmdir(file);
 355         if (err)
 356                 return -errno;
 357         return 0;
 358 }
 359
 360 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
 361 {
 362         int err;
 363
 364         err = mknod(file, mode, makedev(major, minor));
 365         if (err)
 366                 return -errno;
 367         return 0;
 368 }
 369
 370 int link_file(const char *to, const char *from)
 371 {
 372         int err;
 373
 374         err = link(to, from);
 375         if (err)
 376                 return -errno;
 377         return 0;
 378 }
 379
 380 int do_readlink(char *file, char *buf, int size)
 381 {
 382         int n;
 383
 384         n = readlink(file, buf, size);
 385         if (n < 0)
 386                 return -errno;
 387         if (n < size)
 388                 buf[n] = '\0';
 389         return n;
 390 }
 391
 392 int rename_file(char *from, char *to)
 393 {
 394         int err;
 395
 396         err = rename(from, to);
 397         if (err < 0)
 398                 return -errno;
 399         return 0;
 400 }
 401
 402 int do_statfs(char *root, long *bsize_out, long long *blocks_out,
 403               long long *bfree_out, long long *bavail_out,
 404               long long *files_out, long long *ffree_out,
 405               void *fsid_out, int fsid_size, long *namelen_out,
 406               long *spare_out)
 407 {
 408         struct statfs64 buf;
 409         int err;
 410
 411         err = statfs64(root, &buf);
 412         if (err < 0)
 413                 return -errno;
 414
 415         *bsize_out = buf.f_bsize;
 416         *blocks_out = buf.f_blocks;
 417         *bfree_out = buf.f_bfree;
 418         *bavail_out = buf.f_bavail;
 419         *files_out = buf.f_files;
 420         *ffree_out = buf.f_ffree;
 421         memcpy(fsid_out, &buf.f_fsid,
 422                sizeof(buf.f_fsid) > fsid_size ? fsid_size :
 423                sizeof(buf.f_fsid));
 424         *namelen_out = buf.f_namelen;
 425         spare_out[0] = buf.f_spare[0];
 426         spare_out[1] = buf.f_spare[1];
 427         spare_out[2] = buf.f_spare[2];
 428         spare_out[3] = buf.f_spare[3];
 429         spare_out[4] = buf.f_spare[4];
 430         return 0;
 431 }