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