linux/fs/hostfs/hostfs_user.c
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   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
  21static 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
  41int 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
  55int 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
  70int 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
  90void *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
 100char *read_dir(void *stream, unsigned long long *pos,
 101               unsigned long long *ino_out, int *len_out,
 102               unsigned int *type_out)
 103{
 104        DIR *dir = stream;
 105        struct dirent *ent;
 106
 107        seekdir(dir, *pos);
 108        ent = readdir(dir);
 109        if (ent == NULL)
 110                return NULL;
 111        *len_out = strlen(ent->d_name);
 112        *ino_out = ent->d_ino;
 113        *type_out = ent->d_type;
 114        *pos = telldir(dir);
 115        return ent->d_name;
 116}
 117
 118int 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
 129int 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
 140int 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
 150int 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
 163int replace_file(int oldfd, int fd)
 164{
 165        return dup2(oldfd, fd);
 166}
 167
 168void close_file(void *stream)
 169{
 170        close(*((int *) stream));
 171}
 172
 173void close_dir(void *stream)
 174{
 175        closedir(stream);
 176}
 177
 178int 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
 199int 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
 282int 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
 292int 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
 302int 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
 312int 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
 322int 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
 332int 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
 342int 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
 354int 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
 364int 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{
 369        struct statfs64 buf;
 370        int err;
 371
 372        err = statfs64(root, &buf);
 373        if (err < 0)
 374                return -errno;
 375
 376        *bsize_out = buf.f_bsize;
 377        *blocks_out = buf.f_blocks;
 378        *bfree_out = buf.f_bfree;
 379        *bavail_out = buf.f_bavail;
 380        *files_out = buf.f_files;
 381        *ffree_out = buf.f_ffree;
 382        memcpy(fsid_out, &buf.f_fsid,
 383               sizeof(buf.f_fsid) > fsid_size ? fsid_size :
 384               sizeof(buf.f_fsid));
 385        *namelen_out = buf.f_namelen;
 386
 387        return 0;
 388}
 389
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