3 FUSE-based exFAT implementation. Requires FUSE 2.6 or later.
5 Free exFAT implementation.
6 Copyright (C) 2010-2013 Andrew Nayenko
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #define FUSE_USE_VERSION 26
33 #include <sys/types.h>
37 #define exfat_debug(format, ...)
39 #if !defined(FUSE_VERSION) || (FUSE_VERSION < 26)
40 #error FUSE 2.6 or later is required
43 const char* default_options = "ro_fallback,allow_other,blkdev,big_writes,"
48 static struct exfat_node* get_node(const struct fuse_file_info* fi)
50 return (struct exfat_node*) (size_t) fi->fh;
53 static void set_node(struct fuse_file_info* fi, struct exfat_node* node)
55 fi->fh = (uint64_t) (size_t) node;
58 static int fuse_exfat_getattr(const char* path, struct stat* stbuf)
60 struct exfat_node* node;
63 exfat_debug("[%s] %s", __func__, path);
65 rc = exfat_lookup(&ef, &node, path);
69 exfat_stat(&ef, node, stbuf);
70 exfat_put_node(&ef, node);
74 static int fuse_exfat_truncate(const char* path, off_t size)
76 struct exfat_node* node;
79 exfat_debug("[%s] %s, %"PRId64, __func__, path, size);
81 rc = exfat_lookup(&ef, &node, path);
85 rc = exfat_truncate(&ef, node, size, true);
86 exfat_put_node(&ef, node);
90 static int fuse_exfat_readdir(const char* path, void* buffer,
91 fuse_fill_dir_t filler, off_t offset, struct fuse_file_info* fi)
93 struct exfat_node* parent;
94 struct exfat_node* node;
95 struct exfat_iterator it;
97 char name[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
99 exfat_debug("[%s] %s", __func__, path);
101 rc = exfat_lookup(&ef, &parent, path);
104 if (!(parent->flags & EXFAT_ATTRIB_DIR))
106 exfat_put_node(&ef, parent);
107 exfat_error("`%s' is not a directory (0x%x)", path, parent->flags);
111 filler(buffer, ".", NULL, 0);
112 filler(buffer, "..", NULL, 0);
114 rc = exfat_opendir(&ef, parent, &it);
117 exfat_put_node(&ef, parent);
118 exfat_error("failed to open directory `%s'", path);
121 while ((node = exfat_readdir(&ef, &it)))
123 exfat_get_name(node, name, sizeof(name) - 1);
124 exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
125 name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
126 node->size, node->start_cluster);
127 filler(buffer, name, NULL, 0);
128 exfat_put_node(&ef, node);
130 exfat_closedir(&ef, &it);
131 exfat_put_node(&ef, parent);
135 static int fuse_exfat_open(const char* path, struct fuse_file_info* fi)
137 struct exfat_node* node;
140 exfat_debug("[%s] %s", __func__, path);
142 rc = exfat_lookup(&ef, &node, path);
150 static int fuse_exfat_release(const char* path, struct fuse_file_info* fi)
152 exfat_debug("[%s] %s", __func__, path);
153 exfat_put_node(&ef, get_node(fi));
157 static int fuse_exfat_read(const char* path, char* buffer, size_t size,
158 off_t offset, struct fuse_file_info* fi)
162 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
163 ret = exfat_generic_pread(&ef, get_node(fi), buffer, size, offset);
169 static int fuse_exfat_write(const char* path, const char* buffer, size_t size,
170 off_t offset, struct fuse_file_info* fi)
174 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
175 ret = exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
181 static int fuse_exfat_unlink(const char* path)
183 struct exfat_node* node;
186 exfat_debug("[%s] %s", __func__, path);
188 rc = exfat_lookup(&ef, &node, path);
192 rc = exfat_unlink(&ef, node);
193 exfat_put_node(&ef, node);
197 static int fuse_exfat_rmdir(const char* path)
199 struct exfat_node* node;
202 exfat_debug("[%s] %s", __func__, path);
204 rc = exfat_lookup(&ef, &node, path);
208 rc = exfat_rmdir(&ef, node);
209 exfat_put_node(&ef, node);
213 static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
215 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
216 return exfat_mknod(&ef, path);
219 static int fuse_exfat_mkdir(const char* path, mode_t mode)
221 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
222 return exfat_mkdir(&ef, path);
225 static int fuse_exfat_rename(const char* old_path, const char* new_path)
227 exfat_debug("[%s] %s => %s", __func__, old_path, new_path);
228 return exfat_rename(&ef, old_path, new_path);
231 static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
233 struct exfat_node* node;
236 exfat_debug("[%s] %s", __func__, path);
238 rc = exfat_lookup(&ef, &node, path);
242 exfat_utimes(node, tv);
243 exfat_put_node(&ef, node);
247 static int fuse_exfat_chmod(const char* path, mode_t mode)
249 const mode_t VALID_MODE_MASK = S_IFREG | S_IFDIR |
250 S_IRWXU | S_IRWXG | S_IRWXO;
252 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
253 if (mode & ~VALID_MODE_MASK)
258 static int fuse_exfat_chown(const char* path, uid_t uid, gid_t gid)
260 exfat_debug("[%s] %s %u:%u", __func__, path, uid, gid);
261 if (uid != ef.uid || gid != ef.gid)
266 static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
268 exfat_debug("[%s]", __func__);
270 sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
271 sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
272 sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
273 sfs->f_bavail = exfat_count_free_clusters(&ef);
274 sfs->f_bfree = sfs->f_bavail;
275 sfs->f_namemax = EXFAT_NAME_MAX;
278 Below are fake values because in exFAT there is
279 a) no simple way to count files;
280 b) no such thing as inode;
281 So here we assume that inode = cluster.
283 sfs->f_files = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->spc_bits;
284 sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
285 sfs->f_ffree = sfs->f_bavail;
290 static void* fuse_exfat_init(struct fuse_conn_info* fci)
292 exfat_debug("[%s]", __func__);
293 #ifdef FUSE_CAP_BIG_WRITES
294 fci->want |= FUSE_CAP_BIG_WRITES;
299 static void fuse_exfat_destroy(void* unused)
301 exfat_debug("[%s]", __func__);
305 static void usage(const char* prog)
307 fprintf(stderr, "Usage: %s [-d] [-o options] [-V] <device> <dir>\n", prog);
311 static struct fuse_operations fuse_exfat_ops =
313 .getattr = fuse_exfat_getattr,
314 .truncate = fuse_exfat_truncate,
315 .readdir = fuse_exfat_readdir,
316 .open = fuse_exfat_open,
317 .release = fuse_exfat_release,
318 .read = fuse_exfat_read,
319 .write = fuse_exfat_write,
320 .unlink = fuse_exfat_unlink,
321 .rmdir = fuse_exfat_rmdir,
322 .mknod = fuse_exfat_mknod,
323 .mkdir = fuse_exfat_mkdir,
324 .rename = fuse_exfat_rename,
325 .utimens = fuse_exfat_utimens,
326 .chmod = fuse_exfat_chmod,
327 .chown = fuse_exfat_chown,
328 .statfs = fuse_exfat_statfs,
329 .init = fuse_exfat_init,
330 .destroy = fuse_exfat_destroy,
333 static char* add_option(char* options, const char* name, const char* value)
338 size = strlen(options) + strlen(name) + strlen(value) + 3;
340 size = strlen(options) + strlen(name) + 2;
342 options = realloc(options, size);
345 exfat_error("failed to reallocate options string");
348 strcat(options, ",");
349 strcat(options, name);
352 strcat(options, "=");
353 strcat(options, value);
358 static char* add_user_option(char* options)
365 pw = getpwuid(getuid());
366 if (pw == NULL || pw->pw_name == NULL)
369 exfat_error("failed to determine username");
372 return add_option(options, "user", pw->pw_name);
375 static char* add_blksize_option(char* options, long cluster_size)
377 long page_size = sysconf(_SC_PAGESIZE);
383 snprintf(blksize, sizeof(blksize), "%ld", MIN(page_size, cluster_size));
384 return add_option(options, "blksize", blksize);
387 static char* add_fuse_options(char* options, const char* spec)
389 options = add_option(options, "fsname", spec);
392 options = add_user_option(options);
395 options = add_blksize_option(options, CLUSTER_SIZE(*ef.sb));
402 int main(int argc, char* argv[])
404 struct fuse_args mount_args = FUSE_ARGS_INIT(0, NULL);
405 struct fuse_args newfs_args = FUSE_ARGS_INIT(0, NULL);
406 const char* spec = NULL;
407 const char* mount_point = NULL;
410 struct fuse_chan* fc = NULL;
411 struct fuse* fh = NULL;
414 printf("FUSE exfat %u.%u.%u\n",
415 EXFAT_VERSION_MAJOR, EXFAT_VERSION_MINOR, EXFAT_VERSION_PATCH);
417 mount_options = strdup(default_options);
418 if (mount_options == NULL)
420 exfat_error("failed to allocate options string");
424 while ((opt = getopt(argc, argv, "dno:Vv")) != -1)
434 mount_options = add_option(mount_options, optarg, NULL);
435 if (mount_options == NULL)
440 puts("Copyright (C) 2010-2013 Andrew Nayenko");
450 if (argc - optind != 2)
456 mount_point = argv[optind + 1];
458 if (exfat_mount(&ef, spec, mount_options) != 0)
464 if (ef.ro == -1) /* read-only fallback was used */
466 mount_options = add_option(mount_options, "ro", NULL);
467 if (mount_options == NULL)
474 mount_options = add_fuse_options(mount_options, spec);
475 if (mount_options == NULL)
481 /* create arguments for fuse_mount() */
482 if (fuse_opt_add_arg(&mount_args, "exfat") != 0 ||
483 fuse_opt_add_arg(&mount_args, "-o") != 0 ||
484 fuse_opt_add_arg(&mount_args, mount_options) != 0)
493 /* create FUSE mount point */
494 fc = fuse_mount(mount_point, &mount_args);
495 fuse_opt_free_args(&mount_args);
502 /* create arguments for fuse_new() */
503 if (fuse_opt_add_arg(&newfs_args, "") != 0 ||
504 (debug && fuse_opt_add_arg(&newfs_args, "-d") != 0))
506 fuse_unmount(mount_point, fc);
511 /* create new FUSE file system */
512 fh = fuse_new(fc, &newfs_args, &fuse_exfat_ops,
513 sizeof(struct fuse_operations), NULL);
514 fuse_opt_free_args(&newfs_args);
517 fuse_unmount(mount_point, fc);
522 /* exit session on HUP, TERM and INT signals and ignore PIPE signal */
523 if (fuse_set_signal_handlers(fuse_get_session(fh)) != 0)
525 fuse_unmount(mount_point, fc);
528 exfat_error("failed to set signal handlers");
532 /* go to background (unless "-d" option is passed) and run FUSE
534 if (fuse_daemonize(debug) == 0)
536 if (fuse_loop(fh) != 0)
537 exfat_error("FUSE loop failure");
540 exfat_error("failed to daemonize");
542 fuse_remove_signal_handlers(fuse_get_session(fh));
543 /* note that fuse_unmount() must be called BEFORE fuse_destroy() */
544 fuse_unmount(mount_point, fc);