aboutsummaryrefslogtreecommitdiff
path: root/fs/hostfs/hostfs_user.c
blob: 0acf562a5f06f3932a6234db0ac38c4c0386749d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
/*
 * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
 * Licensed under the GPL
 */

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <utime.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/vfs.h>
#include "hostfs.h"
#include "kern_util.h"
#include "user.h"

int stat_file(const char *path, unsigned long long *inode_out, int *mode_out,
	      int *nlink_out, int *uid_out, int *gid_out,
	      unsigned long long *size_out, struct timespec *atime_out,
	      struct timespec *mtime_out, struct timespec *ctime_out,
	      int *blksize_out, unsigned long long *blocks_out, int fd)
{
	struct stat64 buf;

	if(fd >= 0) {
		if (fstat64(fd, &buf) < 0)
			return(-errno);
	} else if(lstat64(path, &buf) < 0) {
		return(-errno);
	}

	if(inode_out != NULL) *inode_out = buf.st_ino;
	if(mode_out != NULL) *mode_out = buf.st_mode;
	if(nlink_out != NULL) *nlink_out = buf.st_nlink;
	if(uid_out != NULL) *uid_out = buf.st_uid;
	if(gid_out != NULL) *gid_out = buf.st_gid;
	if(size_out != NULL) *size_out = buf.st_size;
	if(atime_out != NULL) {
		atime_out->tv_sec = buf.st_atime;
		atime_out->tv_nsec = 0;
	}
	if(mtime_out != NULL) {
		mtime_out->tv_sec = buf.st_mtime;
		mtime_out->tv_nsec = 0;
	}
	if(ctime_out != NULL) {
		ctime_out->tv_sec = buf.st_ctime;
		ctime_out->tv_nsec = 0;
	}
	if(blksize_out != NULL) *blksize_out = buf.st_blksize;
	if(blocks_out != NULL) *blocks_out = buf.st_blocks;
	return(0);
}

int file_type(const char *path, int *maj, int *min)
{
 	struct stat64 buf;

	if(lstat64(path, &buf) < 0)
		return(-errno);
	/*We cannot pass rdev as is because glibc and the kernel disagree
	 *about its definition.*/
	if(maj != NULL)
		*maj = major(buf.st_rdev);
	if(min != NULL)
		*min = minor(buf.st_rdev);

	if(S_ISDIR(buf.st_mode)) return(OS_TYPE_DIR);
	else if(S_ISLNK(buf.st_mode)) return(OS_TYPE_SYMLINK);
	else if(S_ISCHR(buf.st_mode)) return(OS_TYPE_CHARDEV);
	else if(S_ISBLK(buf.st_mode)) return(OS_TYPE_BLOCKDEV);
	else if(S_ISFIFO(buf.st_mode))return(OS_TYPE_FIFO);
	else if(S_ISSOCK(buf.st_mode))return(OS_TYPE_SOCK);
	else return(OS_TYPE_FILE);
}

int access_file(char *path, int r, int w, int x)
{
	int mode = 0;

	if(r) mode = R_OK;
	if(w) mode |= W_OK;
	if(x) mode |= X_OK;
	if(access(path, mode) != 0) return(-errno);
	else return(0);
}

int open_file(char *path, int r, int w, int append)
{
	int mode = 0, fd;

	if(r && !w)
		mode = O_RDONLY;
	else if(!r && w)
		mode = O_WRONLY;
	else if(r && w)
		mode = O_RDWR;
	else panic("Impossible mode in open_file");

	if(append)
		mode |= O_APPEND;
	fd = open64(path, mode);
	if(fd < 0) return(-errno);
	else return(fd);
}

void *open_dir(char *path, int *err_out)
{
	DIR *dir;

	dir = opendir(path);
	*err_out = errno;
	if(dir == NULL) return(NULL);
	return(dir);
}

char *read_dir(void *stream, unsigned long long *pos,
	       unsigned long long *ino_out, int *len_out)
{
	DIR *dir = stream;
	struct dirent *ent;

	seekdir(dir, *pos);
	ent = readdir(dir);
	if(ent == NULL) return(NULL);
	*len_out = strlen(ent->d_name);
	*ino_out = ent->d_ino;
	*pos = telldir(dir);
	return(ent->d_name);
}

int read_file(int fd, unsigned long long *offset, char *buf, int len)
{
	int n;

	n = pread64(fd, buf, len, *offset);
	if(n < 0) return(-errno);
	*offset += n;
	return(n);
}

int write_file(int fd, unsigned long long *offset, const char *buf, int len)
{
	int n;

	n = pwrite64(fd, buf, len, *offset);
	if(n < 0) return(-errno);
	*offset += n;
	return(n);
}

int lseek_file(int fd, long long offset, int whence)
{
	int ret;

	ret = lseek64(fd, offset, whence);
	if(ret < 0)
		return(-errno);
	return(0);
}

int fsync_file(int fd, int datasync)
{
	int ret;
	if (datasync)
		ret = fdatasync(fd);
	else
		ret = fsync(fd);

	if (ret < 0)
		return -errno;
	return 0;
}

void close_file(void *stream)
{
	close(*((int *) stream));
}

void close_dir(void *stream)
{
	closedir(stream);
}

int file_create(char *name, int ur, int uw, int ux, int gr,
		int gw, int gx, int or, int ow, int ox)
{
	int mode, fd;

	mode = 0;
	mode |= ur ? S_IRUSR : 0;
	mode |= uw ? S_IWUSR : 0;
	mode |= ux ? S_IXUSR : 0;
	mode |= gr ? S_IRGRP : 0;
	mode |= gw ? S_IWGRP : 0;
	mode |= gx ? S_IXGRP : 0;
	mode |= or ? S_IROTH : 0;
	mode |= ow ? S_IWOTH : 0;
	mode |= ox ? S_IXOTH : 0;
	fd = open64(name, O_CREAT | O_RDWR, mode);
	if(fd < 0)
		return(-errno);
	return(fd);
}

int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
{
	struct timeval times[2];
	struct timespec atime_ts, mtime_ts;
	int err, ma;

	if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
		if (fd >= 0) {
			if (fchmod(fd, attrs->ia_mode) != 0)
				return (-errno);
		} else if (chmod(file, attrs->ia_mode) != 0) {
			return (-errno);
		}
	}
	if (attrs->ia_valid & HOSTFS_ATTR_UID) {
		if (fd >= 0) {
			if (fchown(fd, attrs->ia_uid, -1))
				return (-errno);
		} else if(chown(file, attrs->ia_uid, -1)) {
			return (-errno);
		}
	}
	if (attrs->ia_valid & HOSTFS_ATTR_GID) {
		if (fd >= 0) {
			if (fchown(fd, -1, attrs->ia_gid))
				return (-errno);
		} else if (chown(file, -1, attrs->ia_gid)) {
			return (-errno);
		}
	}
	if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
		if (fd >= 0) {
			if (ftruncate(fd, attrs->ia_size))
				return (-errno);
		} else if (truncate(file, attrs->ia_size)) {
			return (-errno);
		}
	}

	/* Update accessed and/or modified time, in two parts: first set
	 * times according to the changes to perform, and then call futimes()
	 * or utimes() to apply them. */
	ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
	if (attrs->ia_valid & ma) {
		err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
				&atime_ts, &mtime_ts, NULL, NULL, NULL, fd);
		if (err != 0)
			return err;

		times[0].tv_sec = atime_ts.tv_sec;
		times[0].tv_usec = atime_ts.tv_nsec * 1000;
		times[1].tv_sec = mtime_ts.tv_sec;
		times[1].tv_usec = mtime_ts.tv_nsec * 1000;

		if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
			times[0].tv_sec = attrs->ia_atime.tv_sec;
			times[0].tv_usec = attrs->ia_atime.tv_nsec * 1000;
		}
		if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
			times[1].tv_sec = attrs->ia_mtime.tv_sec;
			times[1].tv_usec = attrs->ia_mtime.tv_nsec * 1000;
		}

		if (fd >= 0) {
			if (futimes(fd, times) != 0)
				return (-errno);
		} else if (utimes(file, times) != 0) {
			return (-errno);
		}
	}

	if(attrs->ia_valid & HOSTFS_ATTR_CTIME) ;
	if(attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)){
		err = stat_file(file, NULL, NULL, NULL, NULL, NULL, NULL,
				&attrs->ia_atime, &attrs->ia_mtime, NULL,
				NULL, NULL, fd);
		if(err != 0) return(err);
	}
	return(0);
}

int make_symlink(const char *from, const char *to)
{
	int err;

	err = symlink(to, from);
	if(err) return(-errno);
	return(0);
}

int unlink_file(const char *file)
{
	int err;

	err = unlink(file);
	if(err) return(-errno);
	return(0);
}

int do_mkdir(const char *file, int mode)
{
	int err;

	err = mkdir(file, mode);
	if(err) return(-errno);
	return(0);
}

int do_rmdir(const char *file)
{
	int err;

	err = rmdir(file);
	if(err) return(-errno);
	return(0);
}

int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
{
	int err;

	err = mknod(file, mode, makedev(major, minor));
	if(err) return(-errno);
	return(0);
}

int link_file(const char *to, const char *from)
{
	int err;

	err = link(to, from);
	if(err) return(-errno);
	return(0);
}

int do_readlink(char *file, char *buf, int size)
{
	int n;

	n = readlink(file, buf, size);
	if(n < 0)
		return(-errno);
	if(n < size)
		buf[n] = '\0';
	return(n);
}

int rename_file(char *from, char *to)
{
	int err;

	err = rename(from, to);
	if(err < 0) return(-errno);
	return(0);
}

int 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,
	      long *spare_out)
{
	struct statfs64 buf;
	int err;

	err = statfs64(root, &buf);
	if(err < 0) return(-errno);
	*bsize_out = buf.f_bsize;
	*blocks_out = buf.f_blocks;
	*bfree_out = buf.f_bfree;
	*bavail_out = buf.f_bavail;
	*files_out = buf.f_files;
	*ffree_out = buf.f_ffree;
	memcpy(fsid_out, &buf.f_fsid,
	       sizeof(buf.f_fsid) > fsid_size ? fsid_size :
	       sizeof(buf.f_fsid));
	*namelen_out = buf.f_namelen;
	spare_out[0] = buf.f_spare[0];
	spare_out[1] = buf.f_spare[1];
	spare_out[2] = buf.f_spare[2];
	spare_out[3] = buf.f_spare[3];
	spare_out[4] = buf.f_spare[4];
	return(0);
}

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-file-style: "linux"
 * End:
 */