3 FUSE-based exFAT implementation. Requires FUSE 2.6 or later.
5 Copyright (C) 2010-2013 Andrew Nayenko
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #define FUSE_USE_VERSION 26
31 #include <sys/types.h>
35 #define exfat_debug(format, ...)
37 #if !defined(FUSE_VERSION) || (FUSE_VERSION < 26)
38 #error FUSE 2.6 or later is required
41 const char* default_options = "ro_fallback,allow_other,blkdev,big_writes,"
50 static struct exfat_node* get_node(const struct fuse_file_info* fi)
52 return (struct exfat_node*) (size_t) fi->fh;
55 static void set_node(struct fuse_file_info* fi, struct exfat_node* node)
57 fi->fh = (uint64_t) (size_t) node;
60 static int fuse_exfat_getattr(const char* path, struct stat* stbuf)
62 struct exfat_node* node;
65 exfat_debug("[%s] %s", __func__, path);
67 rc = exfat_lookup(&ef, &node, path);
71 exfat_stat(&ef, node, stbuf);
72 exfat_put_node(&ef, node);
76 static int fuse_exfat_truncate(const char* path, off_t size)
78 struct exfat_node* node;
81 exfat_debug("[%s] %s, %"PRId64, __func__, path, size);
83 rc = exfat_lookup(&ef, &node, path);
87 rc = exfat_truncate(&ef, node, size, true);
88 exfat_put_node(&ef, node);
92 static int fuse_exfat_readdir(const char* path, void* buffer,
93 fuse_fill_dir_t filler, off_t offset, struct fuse_file_info* fi)
95 struct exfat_node* parent;
96 struct exfat_node* node;
97 struct exfat_iterator it;
99 char name[EXFAT_NAME_MAX + 1];
101 exfat_debug("[%s] %s", __func__, path);
103 rc = exfat_lookup(&ef, &parent, path);
106 if (!(parent->flags & EXFAT_ATTRIB_DIR))
108 exfat_put_node(&ef, parent);
109 exfat_error("`%s' is not a directory (0x%x)", path, parent->flags);
113 filler(buffer, ".", NULL, 0);
114 filler(buffer, "..", NULL, 0);
116 rc = exfat_opendir(&ef, parent, &it);
119 exfat_put_node(&ef, parent);
120 exfat_error("failed to open directory `%s'", path);
123 while ((node = exfat_readdir(&ef, &it)))
125 exfat_get_name(node, name, EXFAT_NAME_MAX);
126 exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
127 name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
128 node->size, node->start_cluster);
129 filler(buffer, name, NULL, 0);
130 exfat_put_node(&ef, node);
132 exfat_closedir(&ef, &it);
133 exfat_put_node(&ef, parent);
137 static int fuse_exfat_open(const char* path, struct fuse_file_info* fi)
139 struct exfat_node* node;
142 exfat_debug("[%s] %s", __func__, path);
144 rc = exfat_lookup(&ef, &node, path);
152 static int fuse_exfat_release(const char* path, struct fuse_file_info* fi)
154 exfat_debug("[%s] %s", __func__, path);
155 exfat_put_node(&ef, get_node(fi));
159 static int fuse_exfat_read(const char* path, char* buffer, size_t size,
160 off_t offset, struct fuse_file_info* fi)
164 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
165 ret = exfat_generic_pread(&ef, get_node(fi), buffer, size, offset);
171 static int fuse_exfat_write(const char* path, const char* buffer, size_t size,
172 off_t offset, struct fuse_file_info* fi)
176 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
177 ret = exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
183 static int fuse_exfat_unlink(const char* path)
185 struct exfat_node* node;
188 exfat_debug("[%s] %s", __func__, path);
190 rc = exfat_lookup(&ef, &node, path);
194 rc = exfat_unlink(&ef, node);
195 exfat_put_node(&ef, node);
199 static int fuse_exfat_rmdir(const char* path)
201 struct exfat_node* node;
204 exfat_debug("[%s] %s", __func__, path);
206 rc = exfat_lookup(&ef, &node, path);
210 rc = exfat_rmdir(&ef, node);
211 exfat_put_node(&ef, node);
215 static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
217 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
218 return exfat_mknod(&ef, path);
221 static int fuse_exfat_mkdir(const char* path, mode_t mode)
223 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
224 return exfat_mkdir(&ef, path);
227 static int fuse_exfat_rename(const char* old_path, const char* new_path)
229 exfat_debug("[%s] %s => %s", __func__, old_path, new_path);
230 return exfat_rename(&ef, old_path, new_path);
233 static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
235 struct exfat_node* node;
238 exfat_debug("[%s] %s", __func__, path);
240 rc = exfat_lookup(&ef, &node, path);
244 exfat_utimes(node, tv);
245 exfat_put_node(&ef, node);
249 static int fuse_exfat_chmod(const char* path, mode_t mode)
251 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
252 return ef.quiet ? 0 : -ENOSYS;
255 static int fuse_exfat_chown(const char* path, uid_t uid, gid_t gid)
257 exfat_debug("[%s] %s %u:%u", __func__, path, uid, gid);
258 return ef.quiet ? 0 : -ENOSYS;
261 static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
263 exfat_debug("[%s]", __func__);
265 sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
266 sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
267 sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
268 sfs->f_bavail = exfat_count_free_clusters(&ef);
269 sfs->f_bfree = sfs->f_bavail;
270 sfs->f_namemax = EXFAT_NAME_MAX;
273 Below are fake values because in exFAT there is
274 a) no simple way to count files;
275 b) no such thing as inode;
276 So here we assume that inode = cluster.
278 sfs->f_files = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->spc_bits;
279 sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
280 sfs->f_ffree = sfs->f_bavail;
285 static void* fuse_exfat_init(struct fuse_conn_info* fci)
287 exfat_debug("[%s]", __func__);
288 #ifdef FUSE_CAP_BIG_WRITES
289 fci->want |= FUSE_CAP_BIG_WRITES;
294 static void fuse_exfat_destroy(void* unused)
296 exfat_debug("[%s]", __func__);
300 static void usage(const char* prog)
302 fprintf(stderr, "Usage: %s [-d] [-o options] [-V] <device> <dir>\n", prog);
306 static struct fuse_operations fuse_exfat_ops =
308 .getattr = fuse_exfat_getattr,
309 .truncate = fuse_exfat_truncate,
310 .readdir = fuse_exfat_readdir,
311 .open = fuse_exfat_open,
312 .release = fuse_exfat_release,
313 .read = fuse_exfat_read,
314 .write = fuse_exfat_write,
315 .unlink = fuse_exfat_unlink,
316 .rmdir = fuse_exfat_rmdir,
317 .mknod = fuse_exfat_mknod,
318 .mkdir = fuse_exfat_mkdir,
319 .rename = fuse_exfat_rename,
320 .utimens = fuse_exfat_utimens,
321 .chmod = fuse_exfat_chmod,
322 .chown = fuse_exfat_chown,
323 .statfs = fuse_exfat_statfs,
324 .init = fuse_exfat_init,
325 .destroy = fuse_exfat_destroy,
328 static char* add_option(char* options, const char* name, const char* value)
333 size = strlen(options) + strlen(name) + strlen(value) + 3;
335 size = strlen(options) + strlen(name) + 2;
337 options = realloc(options, size);
340 exfat_error("failed to reallocate options string");
343 strcat(options, ",");
344 strcat(options, name);
347 strcat(options, "=");
348 strcat(options, value);
353 static char* add_user_option(char* options)
360 pw = getpwuid(getuid());
361 if (pw == NULL || pw->pw_name == NULL)
364 exfat_error("failed to determine username");
367 return add_option(options, "user", pw->pw_name);
370 static char* add_blksize_option(char* options, long cluster_size)
372 long page_size = sysconf(_SC_PAGESIZE);
378 snprintf(blksize, sizeof(blksize), "%ld", MIN(page_size, cluster_size));
379 return add_option(options, "blksize", blksize);
382 static char* add_fuse_options(char* options, const char* spec)
384 options = add_option(options, "fsname", spec);
387 options = add_user_option(options);
390 options = add_blksize_option(options, CLUSTER_SIZE(*ef.sb));
397 int main(int argc, char* argv[])
399 struct fuse_args mount_args = FUSE_ARGS_INIT(0, NULL);
400 struct fuse_args newfs_args = FUSE_ARGS_INIT(0, NULL);
401 const char* spec = NULL;
402 const char* mount_point = NULL;
405 struct fuse_chan* fc = NULL;
406 struct fuse* fh = NULL;
409 printf("FUSE exfat %u.%u.%u\n",
410 EXFAT_VERSION_MAJOR, EXFAT_VERSION_MINOR, EXFAT_VERSION_PATCH);
412 mount_options = strdup(default_options);
413 if (mount_options == NULL)
415 exfat_error("failed to allocate options string");
419 while ((opt = getopt(argc, argv, "dno:Vv")) != -1)
429 mount_options = add_option(mount_options, optarg, NULL);
430 if (mount_options == NULL)
435 puts("Copyright (C) 2010-2013 Andrew Nayenko");
445 if (argc - optind != 2)
451 mount_point = argv[optind + 1];
453 if (exfat_mount(&ef, spec, mount_options) != 0)
459 if (ef.ro == -1) /* read-only fallback was used */
461 mount_options = add_option(mount_options, "ro", NULL);
462 if (mount_options == NULL)
469 mount_options = add_fuse_options(mount_options, spec);
470 if (mount_options == NULL)
476 /* create arguments for fuse_mount() */
477 if (fuse_opt_add_arg(&mount_args, "exfat") != 0 ||
478 fuse_opt_add_arg(&mount_args, "-o") != 0 ||
479 fuse_opt_add_arg(&mount_args, mount_options) != 0)
488 /* create FUSE mount point */
489 fc = fuse_mount(mount_point, &mount_args);
490 fuse_opt_free_args(&mount_args);
497 /* create arguments for fuse_new() */
498 if (fuse_opt_add_arg(&newfs_args, "") != 0 ||
499 (debug && fuse_opt_add_arg(&newfs_args, "-d") != 0))
501 fuse_unmount(mount_point, fc);
506 /* create new FUSE file system */
507 fh = fuse_new(fc, &newfs_args, &fuse_exfat_ops,
508 sizeof(struct fuse_operations), NULL);
509 fuse_opt_free_args(&newfs_args);
512 fuse_unmount(mount_point, fc);
517 /* exit session on HUP, TERM and INT signals and ignore PIPE signal */
518 if (fuse_set_signal_handlers(fuse_get_session(fh)) != 0)
520 fuse_unmount(mount_point, fc);
523 exfat_error("failed to set signal handlers");
527 /* go to background (unless "-d" option is passed) and run FUSE
529 if (fuse_daemonize(debug) == 0)
531 if (fuse_loop(fh) != 0)
532 exfat_error("FUSE loop failure");
535 exfat_error("failed to daemonize");
537 fuse_remove_signal_handlers(fuse_get_session(fh));
538 /* note that fuse_unmount() must be called BEFORE fuse_destroy() */
539 fuse_unmount(mount_point, fc);