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->rdev.maj = os_major(buf->st_rdev);
38 p->rdev.min = os_minor(buf->st_rdev);
39 p->dev.maj = os_major(buf->st_dev);
40 p->dev.min = os_minor(buf->st_dev);
41 }
42
43 int stat_file(const char *path, struct hostfs_stat *p, int fd)
44 {
45 struct stat64 buf;
46
47 if (fd >= 0) {
48 if (fstat64(fd, &buf) < 0)
49 return -errno;
50 } else if (lstat64(path, &buf) < 0) {
51 return -errno;
52 }
53 stat64_to_hostfs(&buf, p);
54 return 0;
55 }
56
57 int access_file(char *path, int r, int w, int x)
58 {
59 int mode = 0;
60
61 if (r)
62 mode = R_OK;
63 if (w)
64 mode |= W_OK;
65 if (x)
66 mode |= X_OK;
67 if (access(path, mode) != 0)
68 return -errno;
69 else return 0;
70 }
71
72 int open_file(char *path, int r, int w, int append)
73 {
74 int mode = 0, fd;
75
76 if (r && !w)
77 mode = O_RDONLY;
78 else if (!r && w)
79 mode = O_WRONLY;
80 else if (r && w)
81 mode = O_RDWR;
82 else panic("Impossible mode in open_file");
83
84 if (append)
85 mode |= O_APPEND;
86 fd = open64(path, mode);
87 if (fd < 0)
88 return -errno;
89 else return fd;
90 }
91
92 void *open_dir(char *path, int *err_out)
93 {
94 DIR *dir;
95
96 dir = opendir(path);
97 *err_out = errno;
98
99 return dir;
100 }
101
102 void seek_dir(void *stream, unsigned long long pos)
103 {
104 DIR *dir = stream;
105
106 seekdir(dir, pos);
107 }
108
109 char *read_dir(void *stream, unsigned long long *pos_out,
110 unsigned long long *ino_out, int *len_out,
111 unsigned int *type_out)
112 {
113 DIR *dir = stream;
114 struct dirent *ent;
115
116 ent = readdir(dir);
117 if (ent == NULL)
118 return NULL;
119 *len_out = strlen(ent->d_name);
120 *ino_out = ent->d_ino;
121 *type_out = ent->d_type;
122 *pos_out = ent->d_off;
123 return ent->d_name;
124 }
125
126 int read_file(int fd, unsigned long long *offset, char *buf, int len)
127 {
128 int n;
129
130 n = pread64(fd, buf, len, *offset);
131 if (n < 0)
132 return -errno;
133 *offset += n;
134 return n;
135 }
136
137 int write_file(int fd, unsigned long long *offset, const char *buf, int len)
138 {
139 int n;
140
141 n = pwrite64(fd, buf, len, *offset);
142 if (n < 0)
143 return -errno;
144 *offset += n;
145 return n;
146 }
147
148 int lseek_file(int fd, long long offset, int whence)
149 {
150 int ret;
151
152 ret = lseek64(fd, offset, whence);
153 if (ret < 0)
154 return -errno;
155 return 0;
156 }
157
158 int fsync_file(int fd, int datasync)
159 {
160 int ret;
161 if (datasync)
162 ret = fdatasync(fd);
163 else
164 ret = fsync(fd);
165
166 if (ret < 0)
167 return -errno;
168 return 0;
169 }
170
171 int replace_file(int oldfd, int fd)
172 {
173 return dup2(oldfd, fd);
174 }
175
176 void close_file(void *stream)
177 {
178 close(*((int *) stream));
179 }
180
181 void close_dir(void *stream)
182 {
183 closedir(stream);
184 }
185
186 int file_create(char *name, int mode)
187 {
188 int fd;
189
190 fd = open64(name, O_CREAT | O_RDWR, mode);
191 if (fd < 0)
192 return -errno;
193 return fd;
194 }
195
196 int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
197 {
198 struct hostfs_stat st;
199 struct timeval times[2];
200 int err, ma;
201
202 if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
203 if (fd >= 0) {
204 if (fchmod(fd, attrs->ia_mode) != 0)
205 return -errno;
206 } else if (chmod(file, attrs->ia_mode) != 0) {
207 return -errno;
208 }
209 }
210 if (attrs->ia_valid & HOSTFS_ATTR_UID) {
211 if (fd >= 0) {
212 if (fchown(fd, attrs->ia_uid, -1))
213 return -errno;
214 } else if (chown(file, attrs->ia_uid, -1)) {
215 return -errno;
216 }
217 }
218 if (attrs->ia_valid & HOSTFS_ATTR_GID) {
219 if (fd >= 0) {
220 if (fchown(fd, -1, attrs->ia_gid))
221 return -errno;
222 } else if (chown(file, -1, attrs->ia_gid)) {
223 return -errno;
224 }
225 }
226 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
227 if (fd >= 0) {
228 if (ftruncate(fd, attrs->ia_size))
229 return -errno;
230 } else if (truncate(file, attrs->ia_size)) {
231 return -errno;
232 }
233 }
234
235 /*
236 * Update accessed and/or modified time, in two parts: first set
237 * times according to the changes to perform, and then call futimes()
238 * or utimes() to apply them.
239 */
240 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
241 if (attrs->ia_valid & ma) {
242 err = stat_file(file, &st, fd);
243 if (err != 0)
244 return err;
245
246 times[0].tv_sec = st.atime.tv_sec;
247 times[0].tv_usec = st.atime.tv_nsec / 1000;
248 times[1].tv_sec = st.mtime.tv_sec;
249 times[1].tv_usec = st.mtime.tv_nsec / 1000;
250
251 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
252 times[0].tv_sec = attrs->ia_atime.tv_sec;
253 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
254 }
255 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
256 times[1].tv_sec = attrs->ia_mtime.tv_sec;
257 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
258 }
259
260 if (fd >= 0) {
261 if (futimes(fd, times) != 0)
262 return -errno;
263 } else if (utimes(file, times) != 0) {
264 return -errno;
265 }
266 }
267
268 /* Note: ctime is not handled */
269 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
270 err = stat_file(file, &st, fd);
271 attrs->ia_atime = st.atime;
272 attrs->ia_mtime = st.mtime;
273 if (err != 0)
274 return err;
275 }
276 return 0;
277 }
278
279 int make_symlink(const char *from, const char *to)
280 {
281 int err;
282
283 err = symlink(to, from);
284 if (err)
285 return -errno;
286 return 0;
287 }
288
289 int unlink_file(const char *file)
290 {
291 int err;
292
293 err = unlink(file);
294 if (err)
295 return -errno;
296 return 0;
297 }
298
299 int do_mkdir(const char *file, int mode)
300 {
301 int err;
302
303 err = mkdir(file, mode);
304 if (err)
305 return -errno;
306 return 0;
307 }
308
309 int hostfs_do_rmdir(const char *file)
310 {
311 int err;
312
313 err = rmdir(file);
314 if (err)
315 return -errno;
316 return 0;
317 }
318
319 int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
320 {
321 int err;
322
323 err = mknod(file, mode, os_makedev(major, minor));
324 if (err)
325 return -errno;
326 return 0;
327 }
328
329 int link_file(const char *to, const char *from)
330 {
331 int err;
332
333 err = link(to, from);
334 if (err)
335 return -errno;
336 return 0;
337 }
338
339 int hostfs_do_readlink(char *file, char *buf, int size)
340 {
341 int n;
342
343 n = readlink(file, buf, size);
344 if (n < 0)
345 return -errno;
346 if (n < size)
347 buf[n] = '\0';
348 return n;
349 }
350
351 int rename_file(char *from, char *to)
352 {
353 int err;
354
355 err = rename(from, to);
356 if (err < 0)
357 return -errno;
358 return 0;
359 }
360
361 int rename2_file(char *from, char *to, unsigned int flags)
362 {
363 int err;
364
365 #ifndef SYS_renameat2
366 # ifdef __x86_64__
367 # define SYS_renameat2 316
368 # endif
369 # ifdef __i386__
370 # define SYS_renameat2 353
371 # endif
372 #endif
373
374 #ifdef SYS_renameat2
375 err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
376 if (err < 0) {
377 if (errno != ENOSYS)
378 return -errno;
379 else
380 return -EINVAL;
381 }
382 return 0;
383 #else
384 return -EINVAL;
385 #endif
386 }
387
388 int do_statfs(char *root, long *bsize_out, long long *blocks_out,
389 long long *bfree_out, long long *bavail_out,
390 long long *files_out, long long *ffree_out,
391 void *fsid_out, int fsid_size, long *namelen_out)
392 {
393 struct statfs64 buf;
394 int err;
395
396 err = statfs64(root, &buf);
397 if (err < 0)
398 return -errno;
399
400 *bsize_out = buf.f_bsize;
401 *blocks_out = buf.f_blocks;
402 *bfree_out = buf.f_bfree;
403 *bavail_out = buf.f_bavail;
404 *files_out = buf.f_files;
405 *ffree_out = buf.f_ffree;
406 memcpy(fsid_out, &buf.f_fsid,
407 sizeof(buf.f_fsid) > fsid_size ? fsid_size :
408 sizeof(buf.f_fsid));
409 *namelen_out = buf.f_namelen;
410
411 return 0;
412 }
413
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