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,"
46 static struct exfat_node* get_node(const struct fuse_file_info* fi)
48 return (struct exfat_node*) (size_t) fi->fh;
51 static void set_node(struct fuse_file_info* fi, struct exfat_node* node)
53 fi->fh = (uint64_t) (size_t) node;
56 static int fuse_exfat_getattr(const char* path, struct stat* stbuf)
58 struct exfat_node* node;
61 exfat_debug("[%s] %s", __func__, path);
63 rc = exfat_lookup(&ef, &node, path);
67 exfat_stat(&ef, node, stbuf);
68 exfat_put_node(&ef, node);
72 static int fuse_exfat_truncate(const char* path, off_t size)
74 struct exfat_node* node;
77 exfat_debug("[%s] %s, %"PRId64, __func__, path, size);
79 rc = exfat_lookup(&ef, &node, path);
83 rc = exfat_truncate(&ef, node, size, true);
84 exfat_put_node(&ef, node);
88 static int fuse_exfat_readdir(const char* path, void* buffer,
89 fuse_fill_dir_t filler, off_t offset, struct fuse_file_info* fi)
91 struct exfat_node* parent;
92 struct exfat_node* node;
93 struct exfat_iterator it;
95 char name[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
97 exfat_debug("[%s] %s", __func__, path);
99 rc = exfat_lookup(&ef, &parent, path);
102 if (!(parent->flags & EXFAT_ATTRIB_DIR))
104 exfat_put_node(&ef, parent);
105 exfat_error("`%s' is not a directory (0x%x)", path, parent->flags);
109 filler(buffer, ".", NULL, 0);
110 filler(buffer, "..", NULL, 0);
112 rc = exfat_opendir(&ef, parent, &it);
115 exfat_put_node(&ef, parent);
116 exfat_error("failed to open directory `%s'", path);
119 while ((node = exfat_readdir(&ef, &it)))
121 exfat_get_name(node, name, sizeof(name) - 1);
122 exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
123 name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
124 node->size, node->start_cluster);
125 filler(buffer, name, NULL, 0);
126 exfat_put_node(&ef, node);
128 exfat_closedir(&ef, &it);
129 exfat_put_node(&ef, parent);
133 static int fuse_exfat_open(const char* path, struct fuse_file_info* fi)
135 struct exfat_node* node;
138 exfat_debug("[%s] %s", __func__, path);
140 rc = exfat_lookup(&ef, &node, path);
148 static int fuse_exfat_release(const char* path, struct fuse_file_info* fi)
150 exfat_debug("[%s] %s", __func__, path);
151 exfat_put_node(&ef, get_node(fi));
155 static int fuse_exfat_read(const char* path, char* buffer, size_t size,
156 off_t offset, struct fuse_file_info* fi)
160 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
161 ret = exfat_generic_pread(&ef, get_node(fi), buffer, size, offset);
167 static int fuse_exfat_write(const char* path, const char* buffer, size_t size,
168 off_t offset, struct fuse_file_info* fi)
172 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
173 ret = exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
179 static int fuse_exfat_unlink(const char* path)
181 struct exfat_node* node;
184 exfat_debug("[%s] %s", __func__, path);
186 rc = exfat_lookup(&ef, &node, path);
190 rc = exfat_unlink(&ef, node);
191 exfat_put_node(&ef, node);
195 static int fuse_exfat_rmdir(const char* path)
197 struct exfat_node* node;
200 exfat_debug("[%s] %s", __func__, path);
202 rc = exfat_lookup(&ef, &node, path);
206 rc = exfat_rmdir(&ef, node);
207 exfat_put_node(&ef, node);
211 static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
213 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
214 return exfat_mknod(&ef, path);
217 static int fuse_exfat_mkdir(const char* path, mode_t mode)
219 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
220 return exfat_mkdir(&ef, path);
223 static int fuse_exfat_rename(const char* old_path, const char* new_path)
225 exfat_debug("[%s] %s => %s", __func__, old_path, new_path);
226 return exfat_rename(&ef, old_path, new_path);
229 static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
231 struct exfat_node* node;
234 exfat_debug("[%s] %s", __func__, path);
236 rc = exfat_lookup(&ef, &node, path);
240 exfat_utimes(node, tv);
241 exfat_put_node(&ef, node);
245 static int fuse_exfat_chmod(const char* path, mode_t mode)
247 const mode_t VALID_MODE_MASK = S_IFREG | S_IFDIR |
248 S_IRWXU | S_IRWXG | S_IRWXO;
250 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
251 if (mode & ~VALID_MODE_MASK)
256 static int fuse_exfat_chown(const char* path, uid_t uid, gid_t gid)
258 exfat_debug("[%s] %s %u:%u", __func__, path, uid, gid);
259 if (uid != ef.uid || gid != ef.gid)
264 static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
266 exfat_debug("[%s]", __func__);
268 sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
269 sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
270 sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
271 sfs->f_bavail = exfat_count_free_clusters(&ef);
272 sfs->f_bfree = sfs->f_bavail;
273 sfs->f_namemax = EXFAT_NAME_MAX;
276 Below are fake values because in exFAT there is
277 a) no simple way to count files;
278 b) no such thing as inode;
279 So here we assume that inode = cluster.
281 sfs->f_files = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->spc_bits;
282 sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
283 sfs->f_ffree = sfs->f_bavail;
288 static void* fuse_exfat_init(struct fuse_conn_info* fci)
290 exfat_debug("[%s]", __func__);
291 #ifdef FUSE_CAP_BIG_WRITES
292 fci->want |= FUSE_CAP_BIG_WRITES;
297 static void fuse_exfat_destroy(void* unused)
299 exfat_debug("[%s]", __func__);
303 static void usage(const char* prog)
305 fprintf(stderr, "Usage: %s [-d] [-o options] [-V] <device> <dir>\n", prog);
309 static struct fuse_operations fuse_exfat_ops =
311 .getattr = fuse_exfat_getattr,
312 .truncate = fuse_exfat_truncate,
313 .readdir = fuse_exfat_readdir,
314 .open = fuse_exfat_open,
315 .release = fuse_exfat_release,
316 .read = fuse_exfat_read,
317 .write = fuse_exfat_write,
318 .unlink = fuse_exfat_unlink,
319 .rmdir = fuse_exfat_rmdir,
320 .mknod = fuse_exfat_mknod,
321 .mkdir = fuse_exfat_mkdir,
322 .rename = fuse_exfat_rename,
323 .utimens = fuse_exfat_utimens,
324 .chmod = fuse_exfat_chmod,
325 .chown = fuse_exfat_chown,
326 .statfs = fuse_exfat_statfs,
327 .init = fuse_exfat_init,
328 .destroy = fuse_exfat_destroy,
331 static char* add_option(char* options, const char* name, const char* value)
336 size = strlen(options) + strlen(name) + strlen(value) + 3;
338 size = strlen(options) + strlen(name) + 2;
340 options = realloc(options, size);
343 exfat_error("failed to reallocate options string");
346 strcat(options, ",");
347 strcat(options, name);
350 strcat(options, "=");
351 strcat(options, value);
356 static char* add_user_option(char* options)
363 pw = getpwuid(getuid());
364 if (pw == NULL || pw->pw_name == NULL)
367 exfat_error("failed to determine username");
370 return add_option(options, "user", pw->pw_name);
373 static char* add_blksize_option(char* options, long cluster_size)
375 long page_size = sysconf(_SC_PAGESIZE);
381 snprintf(blksize, sizeof(blksize), "%ld", MIN(page_size, cluster_size));
382 return add_option(options, "blksize", blksize);
385 static char* add_fuse_options(char* options, const char* spec)
387 options = add_option(options, "fsname", spec);
390 options = add_user_option(options);
393 options = add_blksize_option(options, CLUSTER_SIZE(*ef.sb));
400 int main(int argc, char* argv[])
402 struct fuse_args mount_args = FUSE_ARGS_INIT(0, NULL);
403 struct fuse_args newfs_args = FUSE_ARGS_INIT(0, NULL);
404 const char* spec = NULL;
405 const char* mount_point = NULL;
408 struct fuse_chan* fc = NULL;
409 struct fuse* fh = NULL;
412 printf("FUSE exfat %u.%u.%u\n",
413 EXFAT_VERSION_MAJOR, EXFAT_VERSION_MINOR, EXFAT_VERSION_PATCH);
415 mount_options = strdup(default_options);
416 if (mount_options == NULL)
418 exfat_error("failed to allocate options string");
422 while ((opt = getopt(argc, argv, "dno:Vv")) != -1)
432 mount_options = add_option(mount_options, optarg, NULL);
433 if (mount_options == NULL)
438 puts("Copyright (C) 2010-2013 Andrew Nayenko");
448 if (argc - optind != 2)
454 mount_point = argv[optind + 1];
456 if (exfat_mount(&ef, spec, mount_options) != 0)
462 if (ef.ro == -1) /* read-only fallback was used */
464 mount_options = add_option(mount_options, "ro", NULL);
465 if (mount_options == NULL)
472 mount_options = add_fuse_options(mount_options, spec);
473 if (mount_options == NULL)
479 /* create arguments for fuse_mount() */
480 if (fuse_opt_add_arg(&mount_args, "exfat") != 0 ||
481 fuse_opt_add_arg(&mount_args, "-o") != 0 ||
482 fuse_opt_add_arg(&mount_args, mount_options) != 0)
491 /* create FUSE mount point */
492 fc = fuse_mount(mount_point, &mount_args);
493 fuse_opt_free_args(&mount_args);
500 /* create arguments for fuse_new() */
501 if (fuse_opt_add_arg(&newfs_args, "") != 0 ||
502 (debug && fuse_opt_add_arg(&newfs_args, "-d") != 0))
504 fuse_unmount(mount_point, fc);
509 /* create new FUSE file system */
510 fh = fuse_new(fc, &newfs_args, &fuse_exfat_ops,
511 sizeof(struct fuse_operations), NULL);
512 fuse_opt_free_args(&newfs_args);
515 fuse_unmount(mount_point, fc);
520 /* exit session on HUP, TERM and INT signals and ignore PIPE signal */
521 if (fuse_set_signal_handlers(fuse_get_session(fh)) != 0)
523 fuse_unmount(mount_point, fc);
526 exfat_error("failed to set signal handlers");
530 /* go to background (unless "-d" option is passed) and run FUSE
532 if (fuse_daemonize(debug) == 0)
534 if (fuse_loop(fh) != 0)
535 exfat_error("FUSE loop failure");
538 exfat_error("failed to daemonize");
540 fuse_remove_signal_handlers(fuse_get_session(fh));
541 /* note that fuse_unmount() must be called BEFORE fuse_destroy() */
542 fuse_unmount(mount_point, fc);