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
  98         return dir;
  99 }
 100
 101 char *read_dir(void *stream, unsigned long long *pos,
 102                unsigned long long *ino_out, int *len_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         *pos = telldir(dir);
 114         return ent->d_name;
 115 }
 116
 117 int 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
 128 int 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
 139 int 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
 149 int 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
 162 int replace_file(int oldfd, int fd)
 163 {
 164         return dup2(oldfd, fd);
 165 }
 166
 167 void close_file(void *stream)
 168 {
 169         close(*((int *) stream));
 170 }
 171
 172 void close_dir(void *stream)
 173 {
 174         closedir(stream);
 175 }
 176
 177 int 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
 198 int 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
 281 int 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
 291 int 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
 301 int 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
 311 int 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
 321 int 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
 331 int 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
 341 int 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
 353 int 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
 363 int 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 }