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->rdev.maj = os_major(buf->st_rdev);
  38         p->rdev.min = os_minor(buf->st_rdev);
  39         p->dev.maj = os_major(buf->st_dev);
  40         p->dev.min = os_minor(buf->st_dev);
  41 }
  42
  43 int stat_file(const char *path, struct hostfs_stat *p, int fd)
  44 {
  45         struct stat64 buf;
  46
  47         if (fd >= 0) {
  48                 if (fstat64(fd, &buf) < 0)
  49                         return -errno;
  50         } else if (lstat64(path, &buf) < 0) {
  51                 return -errno;
  52         }
  53         stat64_to_hostfs(&buf, p);
  54         return 0;
  55 }
  56
  57 int access_file(char *path, int r, int w, int x)
  58 {
  59         int mode = 0;
  60
  61         if (r)
  62                 mode = R_OK;
  63         if (w)
  64                 mode |= W_OK;
  65         if (x)
  66                 mode |= X_OK;
  67         if (access(path, mode) != 0)
  68                 return -errno;
  69         else return 0;
  70 }
  71
  72 int open_file(char *path, int r, int w, int append)
  73 {
  74         int mode = 0, fd;
  75
  76         if (r && !w)
  77                 mode = O_RDONLY;
  78         else if (!r && w)
  79                 mode = O_WRONLY;
  80         else if (r && w)
  81                 mode = O_RDWR;
  82         else panic("Impossible mode in open_file");
  83
  84         if (append)
  85                 mode |= O_APPEND;
  86         fd = open64(path, mode);
  87         if (fd < 0)
  88                 return -errno;
  89         else return fd;
  90 }
  91
  92 void *open_dir(char *path, int *err_out)
  93 {
  94         DIR *dir;
  95
  96         dir = opendir(path);
  97         *err_out = errno;
  98
  99         return dir;
 100 }
 101
 102 void seek_dir(void *stream, unsigned long long pos)
 103 {
 104         DIR *dir = stream;
 105
 106         seekdir(dir, pos);
 107 }
 108
 109 char *read_dir(void *stream, unsigned long long *pos_out,
 110                unsigned long long *ino_out, int *len_out,
 111                unsigned int *type_out)
 112 {
 113         DIR *dir = stream;
 114         struct dirent *ent;
 115
 116         ent = readdir(dir);
 117         if (ent == NULL)
 118                 return NULL;
 119         *len_out = strlen(ent->d_name);
 120         *ino_out = ent->d_ino;
 121         *type_out = ent->d_type;
 122         *pos_out = ent->d_off;
 123         return ent->d_name;
 124 }
 125
 126 int read_file(int fd, unsigned long long *offset, char *buf, int len)
 127 {
 128         int n;
 129
 130         n = pread64(fd, buf, len, *offset);
 131         if (n < 0)
 132                 return -errno;
 133         *offset += n;
 134         return n;
 135 }
 136
 137 int write_file(int fd, unsigned long long *offset, const char *buf, int len)
 138 {
 139         int n;
 140
 141         n = pwrite64(fd, buf, len, *offset);
 142         if (n < 0)
 143                 return -errno;
 144         *offset += n;
 145         return n;
 146 }
 147
 148 int lseek_file(int fd, long long offset, int whence)
 149 {
 150         int ret;
 151
 152         ret = lseek64(fd, offset, whence);
 153         if (ret < 0)
 154                 return -errno;
 155         return 0;
 156 }
 157
 158 int fsync_file(int fd, int datasync)
 159 {
 160         int ret;
 161         if (datasync)
 162                 ret = fdatasync(fd);
 163         else
 164                 ret = fsync(fd);
 165
 166         if (ret < 0)
 167                 return -errno;
 168         return 0;
 169 }
 170
 171 int replace_file(int oldfd, int fd)
 172 {
 173         return dup2(oldfd, fd);
 174 }
 175
 176 void close_file(void *stream)
 177 {
 178         close(*((int *) stream));
 179 }
 180
 181 void close_dir(void *stream)
 182 {
 183         closedir(stream);
 184 }
 185
 186 int file_create(char *name, int mode)
 187 {
 188         int fd;
 189
 190         fd = open64(name, O_CREAT | O_RDWR, mode);
 191         if (fd < 0)
 192                 return -errno;
 193         return fd;
 194 }
 195
 196 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
 197 {
 198         struct hostfs_stat st;
 199         struct timeval times[2];
 200         int err, ma;
 201
 202         if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
 203                 if (fd >= 0) {
 204                         if (fchmod(fd, attrs->ia_mode) != 0)
 205                                 return -errno;
 206                 } else if (chmod(file, attrs->ia_mode) != 0) {
 207                         return -errno;
 208                 }
 209         }
 210         if (attrs->ia_valid & HOSTFS_ATTR_UID) {
 211                 if (fd >= 0) {
 212                         if (fchown(fd, attrs->ia_uid, -1))
 213                                 return -errno;
 214                 } else if (chown(file, attrs->ia_uid, -1)) {
 215                         return -errno;
 216                 }
 217         }
 218         if (attrs->ia_valid & HOSTFS_ATTR_GID) {
 219                 if (fd >= 0) {
 220                         if (fchown(fd, -1, attrs->ia_gid))
 221                                 return -errno;
 222                 } else if (chown(file, -1, attrs->ia_gid)) {
 223                         return -errno;
 224                 }
 225         }
 226         if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
 227                 if (fd >= 0) {
 228                         if (ftruncate(fd, attrs->ia_size))
 229                                 return -errno;
 230                 } else if (truncate(file, attrs->ia_size)) {
 231                         return -errno;
 232                 }
 233         }
 234
 235         /*
 236          * Update accessed and/or modified time, in two parts: first set
 237          * times according to the changes to perform, and then call futimes()
 238          * or utimes() to apply them.
 239          */
 240         ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
 241         if (attrs->ia_valid & ma) {
 242                 err = stat_file(file, &st, fd);
 243                 if (err != 0)
 244                         return err;
 245
 246                 times[0].tv_sec = st.atime.tv_sec;
 247                 times[0].tv_usec = st.atime.tv_nsec / 1000;
 248                 times[1].tv_sec = st.mtime.tv_sec;
 249                 times[1].tv_usec = st.mtime.tv_nsec / 1000;
 250
 251                 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
 252                         times[0].tv_sec = attrs->ia_atime.tv_sec;
 253                         times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
 254                 }
 255                 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
 256                         times[1].tv_sec = attrs->ia_mtime.tv_sec;
 257                         times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
 258                 }
 259
 260                 if (fd >= 0) {
 261                         if (futimes(fd, times) != 0)
 262                                 return -errno;
 263                 } else if (utimes(file, times) != 0) {
 264                         return -errno;
 265                 }
 266         }
 267
 268         /* Note: ctime is not handled */
 269         if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
 270                 err = stat_file(file, &st, fd);
 271                 attrs->ia_atime = st.atime;
 272                 attrs->ia_mtime = st.mtime;
 273                 if (err != 0)
 274                         return err;
 275         }
 276         return 0;
 277 }
 278
 279 int make_symlink(const char *from, const char *to)
 280 {
 281         int err;
 282
 283         err = symlink(to, from);
 284         if (err)
 285                 return -errno;
 286         return 0;
 287 }
 288
 289 int unlink_file(const char *file)
 290 {
 291         int err;
 292
 293         err = unlink(file);
 294         if (err)
 295                 return -errno;
 296         return 0;
 297 }
 298
 299 int do_mkdir(const char *file, int mode)
 300 {
 301         int err;
 302
 303         err = mkdir(file, mode);
 304         if (err)
 305                 return -errno;
 306         return 0;
 307 }
 308
 309 int hostfs_do_rmdir(const char *file)
 310 {
 311         int err;
 312
 313         err = rmdir(file);
 314         if (err)
 315                 return -errno;
 316         return 0;
 317 }
 318
 319 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
 320 {
 321         int err;
 322
 323         err = mknod(file, mode, os_makedev(major, minor));
 324         if (err)
 325                 return -errno;
 326         return 0;
 327 }
 328
 329 int link_file(const char *to, const char *from)
 330 {
 331         int err;
 332
 333         err = link(to, from);
 334         if (err)
 335                 return -errno;
 336         return 0;
 337 }
 338
 339 int hostfs_do_readlink(char *file, char *buf, int size)
 340 {
 341         int n;
 342
 343         n = readlink(file, buf, size);
 344         if (n < 0)
 345                 return -errno;
 346         if (n < size)
 347                 buf[n] = '\0';
 348         return n;
 349 }
 350
 351 int rename_file(char *from, char *to)
 352 {
 353         int err;
 354
 355         err = rename(from, to);
 356         if (err < 0)
 357                 return -errno;
 358         return 0;
 359 }
 360
 361 int rename2_file(char *from, char *to, unsigned int flags)
 362 {
 363         int err;
 364
 365 #ifndef SYS_renameat2
 366 #  ifdef __x86_64__
 367 #    define SYS_renameat2 316
 368 #  endif
 369 #  ifdef __i386__
 370 #    define SYS_renameat2 353
 371 #  endif
 372 #endif
 373
 374 #ifdef SYS_renameat2
 375         err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
 376         if (err < 0) {
 377                 if (errno != ENOSYS)
 378                         return -errno;
 379                 else
 380                         return -EINVAL;
 381         }
 382         return 0;
 383 #else
 384         return -EINVAL;
 385 #endif
 386 }
 387
 388 int do_statfs(char *root, long *bsize_out, long long *blocks_out,
 389               long long *bfree_out, long long *bavail_out,
 390               long long *files_out, long long *ffree_out,
 391               void *fsid_out, int fsid_size, long *namelen_out)
 392 {
 393         struct statfs64 buf;
 394         int err;
 395
 396         err = statfs64(root, &buf);
 397         if (err < 0)
 398                 return -errno;
 399
 400         *bsize_out = buf.f_bsize;
 401         *blocks_out = buf.f_blocks;
 402         *bfree_out = buf.f_bfree;
 403         *bavail_out = buf.f_bavail;
 404         *files_out = buf.f_files;
 405         *ffree_out = buf.f_ffree;
 406         memcpy(fsid_out, &buf.f_fsid,
 407                sizeof(buf.f_fsid) > fsid_size ? fsid_size :
 408                sizeof(buf.f_fsid));
 409         *namelen_out = buf.f_namelen;
 410
 411         return 0;
 412 }