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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jeff Dikef1adc052007-05-08 00:23:18 -07002 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Licensed under the GPL
4 */
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <stdio.h>
Jeff Dike84b3db02007-10-16 01:27:13 -07007#include <stddef.h>
8#include <unistd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <dirent.h>
10#include <errno.h>
Jeff Dike84b3db02007-10-16 01:27:13 -070011#include <fcntl.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <string.h>
13#include <sys/stat.h>
14#include <sys/time.h>
Jeff Dike84b3db02007-10-16 01:27:13 -070015#include <sys/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <sys/vfs.h>
17#include "hostfs.h"
Jeff Dike84b3db02007-10-16 01:27:13 -070018#include "os.h"
Jeff Dike84b3db02007-10-16 01:27:13 -070019#include <utime.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Al Viro39b743c2010-06-06 20:08:56 -040021static 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 struct stat64 buf;
44
Jeff Dike84b3db02007-10-16 01:27:13 -070045 if (fd >= 0) {
Alberto Bertogli5822b7f2007-05-08 00:23:16 -070046 if (fstat64(fd, &buf) < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -070047 return -errno;
Jeff Dike84b3db02007-10-16 01:27:13 -070048 } else if (lstat64(path, &buf) < 0) {
Jeff Dikef1adc052007-05-08 00:23:18 -070049 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -070050 }
Al Viro39b743c2010-06-06 20:08:56 -040051 stat64_to_hostfs(&buf, p);
Jeff Dikef1adc052007-05-08 00:23:18 -070052 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053}
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055int access_file(char *path, int r, int w, int x)
56{
57 int mode = 0;
58
Jeff Dike84b3db02007-10-16 01:27:13 -070059 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)
Jeff Dikef1adc052007-05-08 00:23:18 -070066 return -errno;
67 else return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068}
69
70int open_file(char *path, int r, int w, int append)
71{
72 int mode = 0, fd;
73
Jeff Dike84b3db02007-10-16 01:27:13 -070074 if (r && !w)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 mode = O_RDONLY;
Jeff Dike84b3db02007-10-16 01:27:13 -070076 else if (!r && w)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 mode = O_WRONLY;
Jeff Dike84b3db02007-10-16 01:27:13 -070078 else if (r && w)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 mode = O_RDWR;
80 else panic("Impossible mode in open_file");
81
Jeff Dike84b3db02007-10-16 01:27:13 -070082 if (append)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 mode |= O_APPEND;
84 fd = open64(path, mode);
Jeff Dike84b3db02007-10-16 01:27:13 -070085 if (fd < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -070086 return -errno;
87 else return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
90void *open_dir(char *path, int *err_out)
91{
92 DIR *dir;
93
94 dir = opendir(path);
95 *err_out = errno;
Richard Weinbergerc5c6dd42010-10-26 14:22:20 -070096
Jeff Dikef1adc052007-05-08 00:23:18 -070097 return dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
100char *read_dir(void *stream, unsigned long long *pos,
Geert Uytterhoeven3ee6bd82012-01-27 19:14:58 +0100101 unsigned long long *ino_out, int *len_out,
102 unsigned int *type_out)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
104 DIR *dir = stream;
105 struct dirent *ent;
106
107 seekdir(dir, *pos);
108 ent = readdir(dir);
Jeff Dike84b3db02007-10-16 01:27:13 -0700109 if (ent == NULL)
Jeff Dikef1adc052007-05-08 00:23:18 -0700110 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 *len_out = strlen(ent->d_name);
112 *ino_out = ent->d_ino;
Geert Uytterhoeven3ee6bd82012-01-27 19:14:58 +0100113 *type_out = ent->d_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 *pos = telldir(dir);
Jeff Dikef1adc052007-05-08 00:23:18 -0700115 return ent->d_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
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);
Jeff Dike84b3db02007-10-16 01:27:13 -0700123 if (n < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700124 return -errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 *offset += n;
Jeff Dikef1adc052007-05-08 00:23:18 -0700126 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
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);
Jeff Dike84b3db02007-10-16 01:27:13 -0700134 if (n < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700135 return -errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 *offset += n;
Jeff Dikef1adc052007-05-08 00:23:18 -0700137 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138}
139
140int lseek_file(int fd, long long offset, int whence)
141{
142 int ret;
143
144 ret = lseek64(fd, offset, whence);
Jeff Dike84b3db02007-10-16 01:27:13 -0700145 if (ret < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700146 return -errno;
147 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
Paolo 'Blaisorblade' Giarrussoa2d76bd2005-07-28 21:16:15 -0700150int 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
Al Virof8ad8502010-06-06 23:49:18 -0400163int replace_file(int oldfd, int fd)
164{
165 return dup2(oldfd, fd);
166}
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168void 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);
Jeff Dike84b3db02007-10-16 01:27:13 -0700194 if (fd < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700195 return -errno;
196 return fd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
198
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700199int set_attr(const char *file, struct hostfs_iattr *attrs, int fd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
Al Viro39b743c2010-06-06 20:08:56 -0400201 struct hostfs_stat st;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700202 struct timeval times[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 int err, ma;
204
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700205 if (attrs->ia_valid & HOSTFS_ATTR_MODE) {
206 if (fd >= 0) {
207 if (fchmod(fd, attrs->ia_mode) != 0)
Richard Weinbergerc5c6dd42010-10-26 14:22:20 -0700208 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700209 } else if (chmod(file, attrs->ia_mode) != 0) {
Jeff Dikef1adc052007-05-08 00:23:18 -0700210 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700213 if (attrs->ia_valid & HOSTFS_ATTR_UID) {
214 if (fd >= 0) {
215 if (fchown(fd, attrs->ia_uid, -1))
Jeff Dikef1adc052007-05-08 00:23:18 -0700216 return -errno;
Jeff Dike84b3db02007-10-16 01:27:13 -0700217 } else if (chown(file, attrs->ia_uid, -1)) {
Jeff Dikef1adc052007-05-08 00:23:18 -0700218 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700219 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 }
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700221 if (attrs->ia_valid & HOSTFS_ATTR_GID) {
222 if (fd >= 0) {
223 if (fchown(fd, -1, attrs->ia_gid))
Jeff Dikef1adc052007-05-08 00:23:18 -0700224 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700225 } else if (chown(file, -1, attrs->ia_gid)) {
Jeff Dikef1adc052007-05-08 00:23:18 -0700226 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700227 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 }
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700229 if (attrs->ia_valid & HOSTFS_ATTR_SIZE) {
230 if (fd >= 0) {
231 if (ftruncate(fd, attrs->ia_size))
Jeff Dikef1adc052007-05-08 00:23:18 -0700232 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700233 } else if (truncate(file, attrs->ia_size)) {
Jeff Dikef1adc052007-05-08 00:23:18 -0700234 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700235 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Jeff Dike84b3db02007-10-16 01:27:13 -0700238 /*
239 * Update accessed and/or modified time, in two parts: first set
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700240 * times according to the changes to perform, and then call futimes()
Jeff Dike84b3db02007-10-16 01:27:13 -0700241 * or utimes() to apply them.
242 */
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700243 ma = (HOSTFS_ATTR_ATIME_SET | HOSTFS_ATTR_MTIME_SET);
244 if (attrs->ia_valid & ma) {
Al Viro39b743c2010-06-06 20:08:56 -0400245 err = stat_file(file, &st, fd);
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700246 if (err != 0)
247 return err;
248
Al Viro39b743c2010-06-06 20:08:56 -0400249 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;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700253
254 if (attrs->ia_valid & HOSTFS_ATTR_ATIME_SET) {
255 times[0].tv_sec = attrs->ia_atime.tv_sec;
Dominique Quatravauxd7b88512008-02-04 22:31:15 -0800256 times[0].tv_usec = attrs->ia_atime.tv_nsec / 1000;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700258 if (attrs->ia_valid & HOSTFS_ATTR_MTIME_SET) {
259 times[1].tv_sec = attrs->ia_mtime.tv_sec;
Dominique Quatravauxd7b88512008-02-04 22:31:15 -0800260 times[1].tv_usec = attrs->ia_mtime.tv_nsec / 1000;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700261 }
262
263 if (fd >= 0) {
264 if (futimes(fd, times) != 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700265 return -errno;
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700266 } else if (utimes(file, times) != 0) {
Jeff Dikef1adc052007-05-08 00:23:18 -0700267 return -errno;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 }
269 }
Alberto Bertogli5822b7f2007-05-08 00:23:16 -0700270
Jeff Dikebaabd152007-10-16 01:27:13 -0700271 /* Note: ctime is not handled */
Jeff Dike84b3db02007-10-16 01:27:13 -0700272 if (attrs->ia_valid & (HOSTFS_ATTR_ATIME | HOSTFS_ATTR_MTIME)) {
Al Viro39b743c2010-06-06 20:08:56 -0400273 err = stat_file(file, &st, fd);
274 attrs->ia_atime = st.atime;
275 attrs->ia_mtime = st.mtime;
Jeff Dike84b3db02007-10-16 01:27:13 -0700276 if (err != 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700277 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 }
Jeff Dikef1adc052007-05-08 00:23:18 -0700279 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
282int make_symlink(const char *from, const char *to)
283{
284 int err;
285
286 err = symlink(to, from);
Jeff Dike84b3db02007-10-16 01:27:13 -0700287 if (err)
Jeff Dikef1adc052007-05-08 00:23:18 -0700288 return -errno;
289 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
292int unlink_file(const char *file)
293{
294 int err;
295
296 err = unlink(file);
Jeff Dike84b3db02007-10-16 01:27:13 -0700297 if (err)
Jeff Dikef1adc052007-05-08 00:23:18 -0700298 return -errno;
299 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300}
301
302int do_mkdir(const char *file, int mode)
303{
304 int err;
305
306 err = mkdir(file, mode);
Jeff Dike84b3db02007-10-16 01:27:13 -0700307 if (err)
Jeff Dikef1adc052007-05-08 00:23:18 -0700308 return -errno;
309 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
312int do_rmdir(const char *file)
313{
314 int err;
315
316 err = rmdir(file);
Jeff Dike84b3db02007-10-16 01:27:13 -0700317 if (err)
Jeff Dikef1adc052007-05-08 00:23:18 -0700318 return -errno;
319 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320}
321
Johannes Stezenbach88f6cd02007-01-29 13:19:44 -0800322int do_mknod(const char *file, int mode, unsigned int major, unsigned int minor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
324 int err;
325
Al Viro005a59e2009-04-21 01:27:08 -0400326 err = mknod(file, mode, os_makedev(major, minor));
Jeff Dike84b3db02007-10-16 01:27:13 -0700327 if (err)
Jeff Dikef1adc052007-05-08 00:23:18 -0700328 return -errno;
329 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
332int link_file(const char *to, const char *from)
333{
334 int err;
335
336 err = link(to, from);
Jeff Dike84b3db02007-10-16 01:27:13 -0700337 if (err)
Jeff Dikef1adc052007-05-08 00:23:18 -0700338 return -errno;
339 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340}
341
WANG Congea7e7432008-11-19 15:36:46 -0800342int hostfs_do_readlink(char *file, char *buf, int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 int n;
345
346 n = readlink(file, buf, size);
Jeff Dike84b3db02007-10-16 01:27:13 -0700347 if (n < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700348 return -errno;
Jeff Dike84b3db02007-10-16 01:27:13 -0700349 if (n < size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 buf[n] = '\0';
Jeff Dikef1adc052007-05-08 00:23:18 -0700351 return n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
354int rename_file(char *from, char *to)
355{
356 int err;
357
358 err = rename(from, to);
Jeff Dike84b3db02007-10-16 01:27:13 -0700359 if (err < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700360 return -errno;
361 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
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,
Richard Weinberger1b627d52010-10-26 14:21:18 -0700367 void *fsid_out, int fsid_size, long *namelen_out)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368{
369 struct statfs64 buf;
370 int err;
371
372 err = statfs64(root, &buf);
Jeff Dike84b3db02007-10-16 01:27:13 -0700373 if (err < 0)
Jeff Dikef1adc052007-05-08 00:23:18 -0700374 return -errno;
375
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 *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;
Richard Weinberger1b627d52010-10-26 14:21:18 -0700386
Jeff Dikef1adc052007-05-08 00:23:18 -0700387 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}