projects/linux·blob master · refs

421 lines · 7.7 KiB

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
21static void statx_to_hostfs(const struct statx *buf, struct hostfs_stat *p)
22{
23 p->ino = buf->stx_ino;
24 p->mode = buf->stx_mode;
25 p->nlink = buf->stx_nlink;
26 p->uid = buf->stx_uid;
27 p->gid = buf->stx_gid;
28 p->size = buf->stx_size;
29 p->atime.tv_sec = buf->stx_atime.tv_sec;
30 p->atime.tv_nsec = buf->stx_atime.tv_nsec;
31 p->ctime.tv_sec = buf->stx_ctime.tv_sec;
32 p->ctime.tv_nsec = buf->stx_ctime.tv_nsec;
33 p->mtime.tv_sec = buf->stx_mtime.tv_sec;
34 p->mtime.tv_nsec = buf->stx_mtime.tv_nsec;
35 if (buf->stx_mask & STATX_BTIME) {
36 p->btime.tv_sec = buf->stx_btime.tv_sec;
37 p->btime.tv_nsec = buf->stx_btime.tv_nsec;
38 } else {
39 memset(&p->btime, 0, sizeof(p->btime));
40 }
41 p->blksize = buf->stx_blksize;
42 p->blocks = buf->stx_blocks;
43 p->rdev.maj = buf->stx_rdev_major;
44 p->rdev.min = buf->stx_rdev_minor;
45 p->dev.maj = buf->stx_dev_major;
46 p->dev.min = buf->stx_dev_minor;
47}
48
49int stat_file(const char *path, struct hostfs_stat *p, int fd)
50{
51 struct statx buf;
52 int flags = AT_SYMLINK_NOFOLLOW;
53
54 if (fd >= 0) {
55 flags |= AT_EMPTY_PATH;
56 path = "";
57 }
58
59 if ((statx(fd, path, flags, STATX_BASIC_STATS | STATX_BTIME, &buf)) < 0)
60 return -errno;
61
62 statx_to_hostfs(&buf, p);
63 return 0;
64}
65
66int access_file(char *path, int r, int w, int x)
67{
68 int mode = 0;
69
70 if (r)
71 mode = R_OK;
72 if (w)
73 mode |= W_OK;
74 if (x)
75 mode |= X_OK;
76 if (access(path, mode) != 0)
77 return -errno;
78 else return 0;
79}
80
81int open_file(char *path, int r, int w, int append)
82{
83 int mode = 0, fd;
84
85 if (r && !w)
86 mode = O_RDONLY;
87 else if (!r && w)
88 mode = O_WRONLY;
89 else if (r && w)
90 mode = O_RDWR;
91 else panic("Impossible mode in open_file");
92
93 if (append)
94 mode |= O_APPEND;
95 fd = open64(path, mode);
96 if (fd < 0)
97 return -errno;
98 else return fd;
99}
100
101void *open_dir(char *path, int *err_out)
102{
103 DIR *dir;
104
105 dir = opendir(path);
106 *err_out = errno;
107
108 return dir;
109}
110
111void seek_dir(void *stream, unsigned long long pos)
112{
113 DIR *dir = stream;
114
115 seekdir(dir, pos);
116}
117
118char *read_dir(void *stream, unsigned long long *pos_out,
119 unsigned long long *ino_out, int *len_out,
120 unsigned int *type_out)
121{
122 DIR *dir = stream;
123 struct dirent *ent;
124
125 ent = readdir(dir);
126 if (ent == NULL)
127 return NULL;
128 *len_out = strlen(ent->d_name);
129 *ino_out = ent->d_ino;
130 *type_out = ent->d_type;
131 *pos_out = ent->d_off;
132 return ent->d_name;
133}
134
135int read_file(int fd, unsigned long long *offset, char *buf, int len)
136{
137 int n;
138
139 n = pread64(fd, buf, len, *offset);
140 if (n < 0)
141 return -errno;
142 *offset += n;
143 return n;
144}
145
146int write_file(int fd, unsigned long long *offset, const char *buf, int len)
147{
148 int n;
149
150 n = pwrite64(fd, buf, len, *offset);
151 if (n < 0)
152 return -errno;
153 *offset += n;
154 return n;
155}
156
157int lseek_file(int fd, long long offset, int whence)
158{
159 int ret;
160
161 ret = lseek64(fd, offset, whence);
162 if (ret < 0)
163 return -errno;
164 return 0;
165}
166
167int fsync_file(int fd, int datasync)
168{
169 int ret;
170 if (datasync)
171 ret = fdatasync(fd);
172 else
173 ret = fsync(fd);
174
175 if (ret < 0)
176 return -errno;
177 return 0;
178}
179
180int replace_file(int oldfd, int fd)
181{
182 return dup2(oldfd, fd);
183}
184
185void close_file(void *stream)
186{
187 close(*((int *) stream));
188}
189
190void close_dir(void *stream)
191{
192 closedir(stream);
193}
194
195int file_create(char *name, int mode)
196{
197 int fd;
198
199 fd = open64(name, O_CREAT | O_RDWR, mode);
200 if (fd < 0)
201 return -errno;
202 return fd;
203}
204
205int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
206{
207 struct hostfs_stat st;
208 struct timeval times[2];
209 int err, ma;
210
211 if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
212 if (fd >= 0) {
213 if (fchmod(fd, attrs->ia_mode) != 0)
214 return -errno;
215 } else if (chmod(file, attrs->ia_mode) != 0) {
216 return -errno;
217 }
218 }
219 if (attrs->ia_valid & HOSTFS_ATTR_UID) {
220 if (fd >= 0) {
221 if (fchown(fd, attrs->ia_uid, -1))
222 return -errno;
223 } else if (chown(file, attrs->ia_uid, -1)) {
224 return -errno;
225 }
226 }
227 if (attrs->ia_valid & HOSTFS_ATTR_GID) {
228 if (fd >= 0) {
229 if (fchown(fd, -1, attrs->ia_gid))
230 return -errno;
231 } else if (chown(file, -1, attrs->ia_gid)) {
232 return -errno;
233 }
234 }
235 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
236 if (fd >= 0) {
237 if (ftruncate(fd, attrs->ia_size))
238 return -errno;
239 } else if (truncate(file, attrs->ia_size)) {
240 return -errno;
241 }
242 }
243
244 /*
245 * Update accessed and/or modified time, in two parts: first set
246 * times according to the changes to perform, and then call futimes()
247 * or utimes() to apply them.
248 */
249 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
250 if (attrs->ia_valid & ma) {
251 err = stat_file(file, &st, fd);
252 if (err != 0)
253 return err;
254
255 times[0].tv_sec = st.atime.tv_sec;
256 times[0].tv_usec = st.atime.tv_nsec / 1000;
257 times[1].tv_sec = st.mtime.tv_sec;
258 times[1].tv_usec = st.mtime.tv_nsec / 1000;
259
260 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
261 times[0].tv_sec = attrs->ia_atime.tv_sec;
262 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
263 }
264 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
265 times[1].tv_sec = attrs->ia_mtime.tv_sec;
266 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
267 }
268
269 if (fd >= 0) {
270 if (futimes(fd, times) != 0)
271 return -errno;
272 } else if (utimes(file, times) != 0) {
273 return -errno;
274 }
275 }
276
277 /* Note: ctime is not handled */
278 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
279 err = stat_file(file, &st, fd);
280 attrs->ia_atime = st.atime;
281 attrs->ia_mtime = st.mtime;
282 if (err != 0)
283 return err;
284 }
285 return 0;
286}
287
288int make_symlink(const char *from, const char *to)
289{
290 int err;
291
292 err = symlink(to, from);
293 if (err)
294 return -errno;
295 return 0;
296}
297
298int unlink_file(const char *file)
299{
300 int err;
301
302 err = unlink(file);
303 if (err)
304 return -errno;
305 return 0;
306}
307
308int do_mkdir(const char *file, int mode)
309{
310 int err;
311
312 err = mkdir(file, mode);
313 if (err)
314 return -errno;
315 return 0;
316}
317
318int hostfs_do_rmdir(const char *file)
319{
320 int err;
321
322 err = rmdir(file);
323 if (err)
324 return -errno;
325 return 0;
326}
327
328int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
329{
330 int err;
331
332 err = mknod(file, mode, os_makedev(major, minor));
333 if (err)
334 return -errno;
335 return 0;
336}
337
338int link_file(const char *to, const char *from)
339{
340 int err;
341
342 err = link(to, from);
343 if (err)
344 return -errno;
345 return 0;
346}
347
348int hostfs_do_readlink(char *file, char *buf, int size)
349{
350 int n;
351
352 n = readlink(file, buf, size);
353 if (n < 0)
354 return -errno;
355 if (n < size)
356 buf[n] = '\0';
357 return n;
358}
359
360int rename_file(char *from, char *to)
361{
362 int err;
363
364 err = rename(from, to);
365 if (err < 0)
366 return -errno;
367 return 0;
368}
369
370int rename2_file(char *from, char *to, unsigned int flags)
371{
372 int err;
373
374#ifndef SYS_renameat2
375# ifdef __x86_64__
376# define SYS_renameat2 316
377# endif
378# ifdef __i386__
379# define SYS_renameat2 353
380# endif
381#endif
382
383#ifdef SYS_renameat2
384 err = syscall(SYS_renameat2, AT_FDCWD, from, AT_FDCWD, to, flags);
385 if (err < 0) {
386 if (errno != ENOSYS)
387 return -errno;
388 else
389 return -EINVAL;
390 }
391 return 0;
392#else
393 return -EINVAL;
394#endif
395}
396
397int do_statfs(char *root, long *bsize_out, long long *blocks_out,
398 long long *bfree_out, long long *bavail_out,
399 long long *files_out, long long *ffree_out,
400 void *fsid_out, int fsid_size, long *namelen_out)
401{
402 struct statfs64 buf;
403 int err;
404
405 err = statfs64(root, &buf);
406 if (err < 0)
407 return -errno;
408
409 *bsize_out = buf.f_bsize;
410 *blocks_out = buf.f_blocks;
411 *bfree_out = buf.f_bfree;
412 *bavail_out = buf.f_bavail;
413 *files_out = buf.f_files;
414 *ffree_out = buf.f_ffree;
415 memcpy(fsid_out, &buf.f_fsid,
416 sizeof(buf.f_fsid) > fsid_size ? fsid_size :
417 sizeof(buf.f_fsid));
418 *namelen_out = buf.f_namelen;
419
420 return 0;
421}