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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 <sys/syscall.h>
 18 #include "hostfs.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 void seek_dir(void *stream, unsigned long long pos)
101 {
102         DIR *dir = stream;
103 
104         seekdir(dir, pos);
105 }
106 
107 char *read_dir(void *stream, unsigned long long *pos_out,
108                unsigned long long *ino_out, int *len_out,
109                unsigned int *type_out)
110 {
111         DIR *dir = stream;
112         struct dirent *ent;
113 
114         ent = readdir(dir);
115         if (ent == NULL)
116                 return NULL;
117         *len_out = strlen(ent->d_name);
118         *ino_out = ent->d_ino;
119         *type_out = ent->d_type;
120         *pos_out = ent->d_off;
121         return ent->d_name;
122 }
123 
124 int read_file(int fd, unsigned long long *offset, char *buf, int len)
125 {
126         int n;
127 
128         n = pread64(fd, buf, len, *offset);
129         if (n < 0)
130                 return -errno;
131         *offset += n;
132         return n;
133 }
134 
135 int write_file(int fd, unsigned long long *offset, const char *buf, int len)
136 {
137         int n;
138 
139         n = pwrite64(fd, buf, len, *offset);
140         if (n < 0)
141                 return -errno;
142         *offset += n;
143         return n;
144 }
145 
146 int lseek_file(int fd, long long offset, int whence)
147 {
148         int ret;
149 
150         ret = lseek64(fd, offset, whence);
151         if (ret < 0)
152                 return -errno;
153         return 0;
154 }
155 
156 int fsync_file(int fd, int datasync)
157 {
158         int ret;
159         if (datasync)
160                 ret = fdatasync(fd);
161         else
162                 ret = fsync(fd);
163 
164         if (ret < 0)
165                 return -errno;
166         return 0;
167 }
168 
169 int replace_file(int oldfd, int fd)
170 {
171         return dup2(oldfd, fd);
172 }
173 
174 void close_file(void *stream)
175 {
176         close(*((int *) stream));
177 }
178 
179 void close_dir(void *stream)
180 {
181         closedir(stream);
182 }
183 
184 int file_create(char *name, int mode)
185 {
186         int fd;
187 
188         fd = open64(name, O_CREAT | O_RDWR, mode);
189         if (fd < 0)
190                 return -errno;
191         return fd;
192 }
193 
194 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
195 {
196         struct hostfs_stat st;
197         struct timeval times[2];
198         int err, ma;
199 
200         if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
201                 if (fd >= 0) {
202                         if (fchmod(fd, attrs->ia_mode) != 0)
203                                 return -errno;
204                 } else if (chmod(file, attrs->ia_mode) != 0) {
205                         return -errno;
206                 }
207         }
208         if (attrs->ia_valid & HOSTFS_ATTR_UID) {
209                 if (fd >= 0) {
210                         if (fchown(fd, attrs->ia_uid, -1))
211                                 return -errno;
212                 } else if (chown(file, attrs->ia_uid, -1)) {
213                         return -errno;
214                 }
215         }
216         if (attrs->ia_valid & HOSTFS_ATTR_GID) {
217                 if (fd >= 0) {
218                         if (fchown(fd, -1, attrs->ia_gid))
219                                 return -errno;
220                 } else if (chown(file, -1, attrs->ia_gid)) {
221                         return -errno;
222                 }
223         }
224         if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
225                 if (fd >= 0) {
226                         if (ftruncate(fd, attrs->ia_size))
227                                 return -errno;
228                 } else if (truncate(file, attrs->ia_size)) {
229                         return -errno;
230                 }
231         }
232 
233         /*
234          * Update accessed and/or modified time, in two parts: first set
235          * times according to the changes to perform, and then call futimes()
236          * or utimes() to apply them.
237          */
238         ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
239         if (attrs->ia_valid & ma) {
240                 err = stat_file(file, &st, fd);
241                 if (err != 0)
242                         return err;
243 
244                 times[0].tv_sec = st.atime.tv_sec;
245                 times[0].tv_usec = st.atime.tv_nsec / 1000;
246                 times[1].tv_sec = st.mtime.tv_sec;
247                 times[1].tv_usec = st.mtime.tv_nsec / 1000;
248 
249                 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
250                         times[0].tv_sec = attrs->ia_atime.tv_sec;
251                         times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
252                 }
253                 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
254                         times[1].tv_sec = attrs->ia_mtime.tv_sec;
255                         times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
256                 }
257 
258                 if (fd >= 0) {
259                         if (futimes(fd, times) != 0)
260                                 return -errno;
261                 } else if (utimes(file, times) != 0) {
262                         return -errno;
263                 }
264         }
265 
266         /* Note: ctime is not handled */
267         if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
268                 err = stat_file(file, &st, fd);
269                 attrs->ia_atime = st.atime;
270                 attrs->ia_mtime = st.mtime;
271                 if (err != 0)
272                         return err;
273         }
274         return 0;
275 }
276 
277 int make_symlink(const char *from, const char *to)
278 {
279         int err;
280 
281         err = symlink(to, from);
282         if (err)
283                 return -errno;
284         return 0;
285 }
286 
287 int unlink_file(const char *file)
288 {
289         int err;
290 
291         err = unlink(file);
292         if (err)
293                 return -errno;
294         return 0;
295 }
296 
297 int do_mkdir(const char *file, int mode)
298 {
299         int err;
300 
301         err = mkdir(file, mode);
302         if (err)
303                 return -errno;
304         return 0;
305 }
306 
307 int do_rmdir(const char *file)
308 {
309         int err;
310 
311         err = rmdir(file);
312         if (err)
313                 return -errno;
314         return 0;
315 }
316 
317 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
318 {
319         int err;
320 
321         err = mknod(file, mode, os_makedev(major, minor));
322         if (err)
323                 return -errno;
324         return 0;
325 }
326 
327 int link_file(const char *to, const char *from)
328 {
329         int err;
330 
331         err = link(to, from);
332         if (err)
333                 return -errno;
334         return 0;
335 }
336 
337 int hostfs_do_readlink(char *file, char *buf, int size)
338 {
339         int n;
340 
341         n = readlink(file, buf, size);
342         if (n < 0)
343                 return -errno;
344         if (n < size)
345                 buf[n] = '\0';
346         return n;
347 }
348 
349 int rename_file(char *from, char *to)
350 {
351         int err;
352 
353         err = rename(from, to);
354         if (err < 0)
355                 return -errno;
356         return 0;
357 }
358 
359 int rename2_file(char *from, char *to, unsigned int flags)
360 {
361         int err;
362 
363 #ifndef SYS_renameat2
364 #  ifdef __x86_64__
365 #    define SYS_renameat2 316
366 #  endif
367 #  ifdef __i386__
368 #    define SYS_renameat2 353
369 #  endif
370 #endif
371 
372 #ifdef SYS_renameat2
373         err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
374         if (err < 0) {
375                 if (errno != ENOSYS)
376                         return -errno;
377                 else
378                         return -EINVAL;
379         }
380         return 0;
381 #else
382         return -EINVAL;
383 #endif
384 }
385 
386 int do_statfs(char *root, long *bsize_out, long long *blocks_out,
387               long long *bfree_out, long long *bavail_out,
388               long long *files_out, long long *ffree_out,
389               void *fsid_out, int fsid_size, long *namelen_out)
390 {
391         struct statfs64 buf;
392         int err;
393 
394         err = statfs64(root, &buf);
395         if (err < 0)
396                 return -errno;
397 
398         *bsize_out = buf.f_bsize;
399         *blocks_out = buf.f_blocks;
400         *bfree_out = buf.f_bfree;
401         *bavail_out = buf.f_bavail;
402         *files_out = buf.f_files;
403         *ffree_out = buf.f_ffree;
404         memcpy(fsid_out, &buf.f_fsid,
405                sizeof(buf.f_fsid) > fsid_size ? fsid_size :
406                sizeof(buf.f_fsid));
407         *namelen_out = buf.f_namelen;
408 
409         return 0;
410 }
411 

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