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