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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 <utime.h>
20
21static 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
41int 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
55int 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
70int 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
90void *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
100char *read_dir(void *stream, unsigned long long *pos,
101 unsigned long long *ino_out, int *len_out,
102 unsigned int *type_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 *type_out = ent->d_type;
114 *pos = telldir(dir);
115 return ent->d_name;
116}
117
118int read_file(int fd, unsigned long long *offset, char *buf, int len)
119{
120 int n;
121
122 n = pread64(fd, buf, len, *offset);
123 if (n < 0)
124 return -errno;
125 *offset += n;
126 return n;
127}
128
129int write_file(int fd, unsigned long long *offset, const char *buf, int len)
130{
131 int n;
132
133 n = pwrite64(fd, buf, len, *offset);
134 if (n < 0)
135 return -errno;
136 *offset += n;
137 return n;
138}
139
140int lseek_file(int fd, long long offset, int whence)
141{
142 int ret;
143
144 ret = lseek64(fd, offset, whence);
145 if (ret < 0)
146 return -errno;
147 return 0;
148}
149
150int fsync_file(int fd, int datasync)
151{
152 int ret;
153 if (datasync)
154 ret = fdatasync(fd);
155 else
156 ret = fsync(fd);
157
158 if (ret < 0)
159 return -errno;
160 return 0;
161}
162
163int replace_file(int oldfd, int fd)
164{
165 return dup2(oldfd, fd);
166}
167
168void close_file(void *stream)
169{
170 close(*((int *) stream));
171}
172
173void close_dir(void *stream)
174{
175 closedir(stream);
176}
177
178int file_create(char *name, int ur, int uw, int ux, int gr,
179 int gw, int gx, int or, int ow, int ox)
180{
181 int mode, fd;
182
183 mode = 0;
184 mode |= ur ? S_IRUSR : 0;
185 mode |= uw ? S_IWUSR : 0;
186 mode |= ux ? S_IXUSR : 0;
187 mode |= gr ? S_IRGRP : 0;
188 mode |= gw ? S_IWGRP : 0;
189 mode |= gx ? S_IXGRP : 0;
190 mode |= or ? S_IROTH : 0;
191 mode |= ow ? S_IWOTH : 0;
192 mode |= ox ? S_IXOTH : 0;
193 fd = open64(name, O_CREAT | O_RDWR, mode);
194 if (fd < 0)
195 return -errno;
196 return fd;
197}
198
199int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
200{
201 struct hostfs_stat st;
202 struct timeval times[2];
203 int err, ma;
204
205 if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
206 if (fd >= 0) {
207 if (fchmod(fd, attrs->ia_mode) != 0)
208 return -errno;
209 } else if (chmod(file, attrs->ia_mode) != 0) {
210 return -errno;
211 }
212 }
213 if (attrs->ia_valid & HOSTFS_ATTR_UID) {
214 if (fd >= 0) {
215 if (fchown(fd, attrs->ia_uid, -1))
216 return -errno;
217 } else if (chown(file, attrs->ia_uid, -1)) {
218 return -errno;
219 }
220 }
221 if (attrs->ia_valid & HOSTFS_ATTR_GID) {
222 if (fd >= 0) {
223 if (fchown(fd, -1, attrs->ia_gid))
224 return -errno;
225 } else if (chown(file, -1, attrs->ia_gid)) {
226 return -errno;
227 }
228 }
229 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
230 if (fd >= 0) {
231 if (ftruncate(fd, attrs->ia_size))
232 return -errno;
233 } else if (truncate(file, attrs->ia_size)) {
234 return -errno;
235 }
236 }
237
238
239
240
241
242
243 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
244 if (attrs->ia_valid & ma) {
245 err = stat_file(file, &st, fd);
246 if (err != 0)
247 return err;
248
249 times[0].tv_sec = st.atime.tv_sec;
250 times[0].tv_usec = st.atime.tv_nsec / 1000;
251 times[1].tv_sec = st.mtime.tv_sec;
252 times[1].tv_usec = st.mtime.tv_nsec / 1000;
253
254 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
255 times[0].tv_sec = attrs->ia_atime.tv_sec;
256 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
257 }
258 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
259 times[1].tv_sec = attrs->ia_mtime.tv_sec;
260 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
261 }
262
263 if (fd >= 0) {
264 if (futimes(fd, times) != 0)
265 return -errno;
266 } else if (utimes(file, times) != 0) {
267 return -errno;
268 }
269 }
270
271
272 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
273 err = stat_file(file, &st, fd);
274 attrs->ia_atime = st.atime;
275 attrs->ia_mtime = st.mtime;
276 if (err != 0)
277 return err;
278 }
279 return 0;
280}
281
282int make_symlink(const char *from, const char *to)
283{
284 int err;
285
286 err = symlink(to, from);
287 if (err)
288 return -errno;
289 return 0;
290}
291
292int unlink_file(const char *file)
293{
294 int err;
295
296 err = unlink(file);
297 if (err)
298 return -errno;
299 return 0;
300}
301
302int do_mkdir(const char *file, int mode)
303{
304 int err;
305
306 err = mkdir(file, mode);
307 if (err)
308 return -errno;
309 return 0;
310}
311
312int do_rmdir(const char *file)
313{
314 int err;
315
316 err = rmdir(file);
317 if (err)
318 return -errno;
319 return 0;
320}
321
322int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
323{
324 int err;
325
326 err = mknod(file, mode, os_makedev(major, minor));
327 if (err)
328 return -errno;
329 return 0;
330}
331
332int link_file(const char *to, const char *from)
333{
334 int err;
335
336 err = link(to, from);
337 if (err)
338 return -errno;
339 return 0;
340}
341
342int hostfs_do_readlink(char *file, char *buf, int size)
343{
344 int n;
345
346 n = readlink(file, buf, size);
347 if (n < 0)
348 return -errno;
349 if (n < size)
350 buf[n] = '\0';
351 return n;
352}
353
354int rename_file(char *from, char *to)
355{
356 int err;
357
358 err = rename(from, to);
359 if (err < 0)
360 return -errno;
361 return 0;
362}
363
364int do_statfs(char *root, long *bsize_out, long long *blocks_out,
365 long long *bfree_out, long long *bavail_out,
366 long long *files_out, long long *ffree_out,
367 void *fsid_out, int fsid_size, long *namelen_out)
368{
369 struct statfs64 buf;
370 int err;
371
372 err = statfs64(root, &buf);
373 if (err < 0)
374 return -errno;
375
376 *bsize_out = buf.f_bsize;
377 *blocks_out = buf.f_blocks;
378 *bfree_out = buf.f_bfree;
379 *bavail_out = buf.f_bavail;
380 *files_out = buf.f_files;
381 *ffree_out = buf.f_ffree;
382 memcpy(fsid_out, &buf.f_fsid,
383 sizeof(buf.f_fsid) > fsid_size ? fsid_size :
384 sizeof(buf.f_fsid));
385 *namelen_out = buf.f_namelen;
386
387 return 0;
388}
389
