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