This source file includes following definitions.
- stat64_to_hostfs
- stat_file
- access_file
- open_file
- open_dir
- seek_dir
- read_dir
- read_file
- write_file
- lseek_file
- fsync_file
- replace_file
- close_file
- close_dir
- file_create
- set_attr
- make_symlink
- unlink_file
- do_mkdir
- hostfs_do_rmdir
- do_mknod
- link_file
- hostfs_do_readlink
- rename_file
- rename2_file
- do_statfs
1
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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
235
236
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
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 hostfs_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 }