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 static 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
  42 int 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
  56 int 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
  71 int 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
  91 void *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
 102 char *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
 118 int 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
 129 int 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
 140 int 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
 150 int 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
 163 int replace_file(int oldfd, int fd)
 164 {
 165         return dup2(oldfd, fd);
 166 }
 167
 168 void close_file(void *stream)
 169 {
 170         close(*((int *) stream));
 171 }
 172
 173 void close_dir(void *stream)
 174 {
 175         closedir(stream);
 176 }
 177
 178 int 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
 199 int 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
 282 int 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
 292 int 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
 302 int 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
 312 int 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
 322 int 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
 332 int 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
 342 int 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
 354 int 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
 364 int 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               long *spare_out)
 369 {
 370         struct statfs64 buf;
 371         int err;
 372
 373         err = statfs64(root, &buf);
 374         if (err < 0)
 375                 return -errno;
 376
 377         *bsize_out = buf.f_bsize;
 378         *blocks_out = buf.f_blocks;
 379         *bfree_out = buf.f_bfree;
 380         *bavail_out = buf.f_bavail;
 381         *files_out = buf.f_files;
 382         *ffree_out = buf.f_ffree;
 383         memcpy(fsid_out, &buf.f_fsid,
 384                sizeof(buf.f_fsid) > fsid_size ? fsid_size :
 385                sizeof(buf.f_fsid));
 386         *namelen_out = buf.f_namelen;
 387         spare_out[0] = buf.f_spare[0];
 388         spare_out[1] = buf.f_spare[1];
 389         spare_out[2] = buf.f_spare[2];
 390         spare_out[3] = buf.f_spare[3];
 391         spare_out[4] = buf.f_spare[4];
 392         return 0;
 393 }