linux/fs/hostfs/hostfs_user.c
<<
>>
Prefs
   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 <utime.h>
  19
  20static void stat64_to_hostfs(const struct stat64 *buf, struct hostfs_stat *p)
  21{
  22        p->ino = buf->st_ino;
  23        p->mode = buf->st_mode;
  24        p->nlink = buf->st_nlink;
  25        p->uid = buf->st_uid;
  26        p->gid = buf->st_gid;
  27        p->size = buf->st_size;
  28        p->atime.tv_sec = buf->st_atime;
  29        p->atime.tv_nsec = 0;
  30        p->ctime.tv_sec = buf->st_ctime;
  31        p->ctime.tv_nsec = 0;
  32        p->mtime.tv_sec = buf->st_mtime;
  33        p->mtime.tv_nsec = 0;
  34        p->blksize = buf->st_blksize;
  35        p->blocks = buf->st_blocks;
  36        p->maj = os_major(buf->st_rdev);
  37        p->min = os_minor(buf->st_rdev);
  38}
  39
  40int stat_file(const char *path, struct hostfs_stat *p, int fd)
  41{
  42        struct stat64 buf;
  43
  44        if (fd >= 0) {
  45                if (fstat64(fd, &buf) < 0)
  46                        return -errno;
  47        } else if (lstat64(path, &buf) < 0) {
  48                return -errno;
  49        }
  50        stat64_to_hostfs(&buf, p);
  51        return 0;
  52}
  53
  54int access_file(char *path, int r, int w, int x)
  55{
  56        int mode = 0;
  57
  58        if (r)
  59                mode = R_OK;
  60        if (w)
  61                mode |= W_OK;
  62        if (x)
  63                mode |= X_OK;
  64        if (access(path, mode) != 0)
  65                return -errno;
  66        else return 0;
  67}
  68
  69int open_file(char *path, int r, int w, int append)
  70{
  71        int mode = 0, fd;
  72
  73        if (r && !w)
  74                mode = O_RDONLY;
  75        else if (!r && w)
  76                mode = O_WRONLY;
  77        else if (r && w)
  78                mode = O_RDWR;
  79        else panic("Impossible mode in open_file");
  80
  81        if (append)
  82                mode |= O_APPEND;
  83        fd = open64(path, mode);
  84        if (fd < 0)
  85                return -errno;
  86        else return fd;
  87}
  88
  89void *open_dir(char *path, int *err_out)
  90{
  91        DIR *dir;
  92
  93        dir = opendir(path);
  94        *err_out = errno;
  95
  96        return dir;
  97}
  98
  99char *read_dir(void *stream, unsigned long long *pos,
 100               unsigned long long *ino_out, int *len_out,
 101               unsigned int *type_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        *type_out = ent->d_type;
 113        *pos = telldir(dir);
 114        return ent->d_name;
 115}
 116
 117int read_file(int fd, unsigned long long *offset, char *buf, int len)
 118{
 119        int n;
 120
 121        n = pread64(fd, buf, len, *offset);
 122        if (n < 0)
 123                return -errno;
 124        *offset += n;
 125        return n;
 126}
 127
 128int write_file(int fd, unsigned long long *offset, const char *buf, int len)
 129{
 130        int n;
 131
 132        n = pwrite64(fd, buf, len, *offset);
 133        if (n < 0)
 134                return -errno;
 135        *offset += n;
 136        return n;
 137}
 138
 139int lseek_file(int fd, long long offset, int whence)
 140{
 141        int ret;
 142
 143        ret = lseek64(fd, offset, whence);
 144        if (ret < 0)
 145                return -errno;
 146        return 0;
 147}
 148
 149int fsync_file(int fd, int datasync)
 150{
 151        int ret;
 152        if (datasync)
 153                ret = fdatasync(fd);
 154        else
 155                ret = fsync(fd);
 156
 157        if (ret < 0)
 158                return -errno;
 159        return 0;
 160}
 161
 162int replace_file(int oldfd, int fd)
 163{
 164        return dup2(oldfd, fd);
 165}
 166
 167void close_file(void *stream)
 168{
 169        close(*((int *) stream));
 170}
 171
 172void close_dir(void *stream)
 173{
 174        closedir(stream);
 175}
 176
 177int file_create(char *name, int ur, int uw, int ux, int gr,
 178                int gw, int gx, int or, int ow, int ox)
 179{
 180        int mode, fd;
 181
 182        mode = 0;
 183        mode |= ur ? S_IRUSR : 0;
 184        mode |= uw ? S_IWUSR : 0;
 185        mode |= ux ? S_IXUSR : 0;
 186        mode |= gr ? S_IRGRP : 0;
 187        mode |= gw ? S_IWGRP : 0;
 188        mode |= gx ? S_IXGRP : 0;
 189        mode |= or ? S_IROTH : 0;
 190        mode |= ow ? S_IWOTH : 0;
 191        mode |= ox ? S_IXOTH : 0;
 192        fd = open64(name, O_CREAT | O_RDWR, mode);
 193        if (fd < 0)
 194                return -errno;
 195        return fd;
 196}
 197
 198int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
 199{
 200        struct hostfs_stat st;
 201        struct timeval times[2];
 202        int err, ma;
 203
 204        if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
 205                if (fd >= 0) {
 206                        if (fchmod(fd, attrs->ia_mode) != 0)
 207                                return -errno;
 208                } else if (chmod(file, attrs->ia_mode) != 0) {
 209                        return -errno;
 210                }
 211        }
 212        if (attrs->ia_valid & HOSTFS_ATTR_UID) {
 213                if (fd >= 0) {
 214                        if (fchown(fd, attrs->ia_uid, -1))
 215                                return -errno;
 216                } else if (chown(file, attrs->ia_uid, -1)) {
 217                        return -errno;
 218                }
 219        }
 220        if (attrs->ia_valid & HOSTFS_ATTR_GID) {
 221                if (fd >= 0) {
 222                        if (fchown(fd, -1, attrs->ia_gid))
 223                                return -errno;
 224                } else if (chown(file, -1, attrs->ia_gid)) {
 225                        return -errno;
 226                }
 227        }
 228        if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
 229                if (fd >= 0) {
 230                        if (ftruncate(fd, attrs->ia_size))
 231                                return -errno;
 232                } else if (truncate(file, attrs->ia_size)) {
 233                        return -errno;
 234                }
 235        }
 236
 237        /*
 238         * Update accessed and/or modified time, in two parts: first set
 239         * times according to the changes to perform, and then call futimes()
 240         * or utimes() to apply them.
 241         */
 242        ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
 243        if (attrs->ia_valid & ma) {
 244                err = stat_file(file, &st, fd);
 245                if (err != 0)
 246                        return err;
 247
 248                times[0].tv_sec = st.atime.tv_sec;
 249                times[0].tv_usec = st.atime.tv_nsec / 1000;
 250                times[1].tv_sec = st.mtime.tv_sec;
 251                times[1].tv_usec = st.mtime.tv_nsec / 1000;
 252
 253                if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
 254                        times[0].tv_sec = attrs->ia_atime.tv_sec;
 255                        times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
 256                }
 257                if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
 258                        times[1].tv_sec = attrs->ia_mtime.tv_sec;
 259                        times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
 260                }
 261
 262                if (fd >= 0) {
 263                        if (futimes(fd, times) != 0)
 264                                return -errno;
 265                } else if (utimes(file, times) != 0) {
 266                        return -errno;
 267                }
 268        }
 269
 270        /* Note: ctime is not handled */
 271        if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
 272                err = stat_file(file, &st, fd);
 273                attrs->ia_atime = st.atime;
 274                attrs->ia_mtime = st.mtime;
 275                if (err != 0)
 276                        return err;
 277        }
 278        return 0;
 279}
 280
 281int make_symlink(const char *from, const char *to)
 282{
 283        int err;
 284
 285        err = symlink(to, from);
 286        if (err)
 287                return -errno;
 288        return 0;
 289}
 290
 291int unlink_file(const char *file)
 292{
 293        int err;
 294
 295        err = unlink(file);
 296        if (err)
 297                return -errno;
 298        return 0;
 299}
 300
 301int do_mkdir(const char *file, int mode)
 302{
 303        int err;
 304
 305        err = mkdir(file, mode);
 306        if (err)
 307                return -errno;
 308        return 0;
 309}
 310
 311int do_rmdir(const char *file)
 312{
 313        int err;
 314
 315        err = rmdir(file);
 316        if (err)
 317                return -errno;
 318        return 0;
 319}
 320
 321int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
 322{
 323        int err;
 324
 325        err = mknod(file, mode, os_makedev(major, minor));
 326        if (err)
 327                return -errno;
 328        return 0;
 329}
 330
 331int link_file(const char *to, const char *from)
 332{
 333        int err;
 334
 335        err = link(to, from);
 336        if (err)
 337                return -errno;
 338        return 0;
 339}
 340
 341int hostfs_do_readlink(char *file, char *buf, int size)
 342{
 343        int n;
 344
 345        n = readlink(file, buf, size);
 346        if (n < 0)
 347                return -errno;
 348        if (n < size)
 349                buf[n] = '\0';
 350        return n;
 351}
 352
 353int rename_file(char *from, char *to)
 354{
 355        int err;
 356
 357        err = rename(from, to);
 358        if (err < 0)
 359                return -errno;
 360        return 0;
 361}
 362
 363int do_statfs(char *root, long *bsize_out, long long *blocks_out,
 364              long long *bfree_out, long long *bavail_out,
 365              long long *files_out, long long *ffree_out,
 366              void *fsid_out, int fsid_size, long *namelen_out)
 367{
 368        struct statfs64 buf;
 369        int err;
 370
 371        err = statfs64(root, &buf);
 372        if (err < 0)
 373                return -errno;
 374
 375        *bsize_out = buf.f_bsize;
 376        *blocks_out = buf.f_blocks;
 377        *bfree_out = buf.f_bfree;
 378        *bavail_out = buf.f_bavail;
 379        *files_out = buf.f_files;
 380        *ffree_out = buf.f_ffree;
 381        memcpy(fsid_out, &buf.f_fsid,
 382               sizeof(buf.f_fsid) > fsid_size ? fsid_size :
 383               sizeof(buf.f_fsid));
 384        *namelen_out = buf.f_namelen;
 385
 386        return 0;
 387}
 388
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.