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 "hostfs.h"
18 #include "os.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 }
40
stat_file(const char * path,struct hostfs_stat * p,int fd)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
access_file(char * path,int r,int w,int x)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
open_file(char * path,int r,int w,int append)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
open_dir(char * path,int * err_out)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
read_dir(void * stream,unsigned long long * pos,unsigned long long * ino_out,int * len_out,unsigned int * type_out)100 char *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
read_file(int fd,unsigned long long * offset,char * buf,int len)118 int 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
write_file(int fd,unsigned long long * offset,const char * buf,int len)129 int 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
lseek_file(int fd,long long offset,int whence)140 int 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
fsync_file(int fd,int datasync)150 int 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
replace_file(int oldfd,int fd)163 int replace_file(int oldfd, int fd)
164 {
165 return dup2(oldfd, fd);
166 }
167
close_file(void * stream)168 void close_file(void *stream)
169 {
170 close(*((int *) stream));
171 }
172
close_dir(void * stream)173 void close_dir(void *stream)
174 {
175 closedir(stream);
176 }
177
file_create(char * name,int ur,int uw,int ux,int gr,int gw,int gx,int or,int ow,int ox)178 int 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
set_attr(const char * file,struct hostfs_iattr * attrs,int fd)199 int 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 * Update accessed and/or modified time, in two parts: first set
240 * times according to the changes to perform, and then call futimes()
241 * or utimes() to apply them.
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 /* Note: ctime is not handled */
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
make_symlink(const char * from,const char * to)282 int 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
unlink_file(const char * file)292 int 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
do_mkdir(const char * file,int mode)302 int 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
do_rmdir(const char * file)312 int 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
do_mknod(const char * file,int mode,unsigned int major,unsigned int minor)322 int 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
link_file(const char * to,const char * from)332 int 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
hostfs_do_readlink(char * file,char * buf,int size)342 int 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
rename_file(char * from,char * to)354 int 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
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)364 int 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