3 FUSE-based exFAT implementation. Requires FUSE 2.6 or later.
5 Copyright (C) 2010-2012 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";
45 static struct exfat_node* get_node(const struct fuse_file_info* fi)
47 return (struct exfat_node*) (size_t) fi->fh;
50 static void set_node(struct fuse_file_info* fi, struct exfat_node* node)
52 fi->fh = (uint64_t) (size_t) node;
55 static int fuse_exfat_getattr(const char* path, struct stat* stbuf)
57 struct exfat_node* node;
60 exfat_debug("[%s] %s", __func__, path);
62 rc = exfat_lookup(&ef, &node, path);
66 exfat_stat(&ef, node, stbuf);
67 exfat_put_node(&ef, node);
71 static int fuse_exfat_truncate(const char* path, off_t size)
73 struct exfat_node* node;
76 exfat_debug("[%s] %s, %"PRId64, __func__, path, size);
78 rc = exfat_lookup(&ef, &node, path);
82 rc = exfat_truncate(&ef, node, size);
83 exfat_put_node(&ef, node);
87 static int fuse_exfat_readdir(const char* path, void* buffer,
88 fuse_fill_dir_t filler, off_t offset, struct fuse_file_info* fi)
90 struct exfat_node* parent;
91 struct exfat_node* node;
92 struct exfat_iterator it;
94 char name[EXFAT_NAME_MAX + 1];
96 exfat_debug("[%s] %s", __func__, path);
98 rc = exfat_lookup(&ef, &parent, path);
101 if (!(parent->flags & EXFAT_ATTRIB_DIR))
103 exfat_put_node(&ef, parent);
104 exfat_error("`%s' is not a directory (0x%x)", path, parent->flags);
108 filler(buffer, ".", NULL, 0);
109 filler(buffer, "..", NULL, 0);
111 rc = exfat_opendir(&ef, parent, &it);
114 exfat_put_node(&ef, parent);
115 exfat_error("failed to open directory `%s'", path);
118 while ((node = exfat_readdir(&ef, &it)))
120 exfat_get_name(node, name, EXFAT_NAME_MAX);
121 exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
122 name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
123 node->size, node->start_cluster);
124 filler(buffer, name, NULL, 0);
125 exfat_put_node(&ef, node);
127 exfat_closedir(&ef, &it);
128 exfat_put_node(&ef, parent);
132 static int fuse_exfat_open(const char* path, struct fuse_file_info* fi)
134 struct exfat_node* node;
137 exfat_debug("[%s] %s", __func__, path);
139 rc = exfat_lookup(&ef, &node, path);
147 static int fuse_exfat_release(const char* path, struct fuse_file_info* fi)
149 exfat_debug("[%s] %s", __func__, path);
150 exfat_put_node(&ef, get_node(fi));
154 static int fuse_exfat_read(const char* path, char* buffer, size_t size,
155 off_t offset, struct fuse_file_info* fi)
157 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
158 if (exfat_generic_pread(&ef, get_node(fi), buffer, size, offset) != size)
163 static int fuse_exfat_write(const char* path, const char* buffer, size_t size,
164 off_t offset, struct fuse_file_info* fi)
166 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
167 if (exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset) != size)
172 static int fuse_exfat_unlink(const char* path)
174 struct exfat_node* node;
177 exfat_debug("[%s] %s", __func__, path);
179 rc = exfat_lookup(&ef, &node, path);
183 rc = exfat_unlink(&ef, node);
184 exfat_put_node(&ef, node);
188 static int fuse_exfat_rmdir(const char* path)
190 struct exfat_node* node;
193 exfat_debug("[%s] %s", __func__, path);
195 rc = exfat_lookup(&ef, &node, path);
199 rc = exfat_rmdir(&ef, node);
200 exfat_put_node(&ef, node);
204 static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
206 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
207 return exfat_mknod(&ef, path);
210 static int fuse_exfat_mkdir(const char* path, mode_t mode)
212 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
213 return exfat_mkdir(&ef, path);
216 static int fuse_exfat_rename(const char* old_path, const char* new_path)
218 exfat_debug("[%s] %s => %s", __func__, old_path, new_path);
219 return exfat_rename(&ef, old_path, new_path);
222 static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
224 struct exfat_node* node;
227 exfat_debug("[%s] %s", __func__, path);
229 rc = exfat_lookup(&ef, &node, path);
233 exfat_utimes(node, tv);
234 exfat_put_node(&ef, node);
239 static int fuse_exfat_chmod(const char* path, mode_t mode)
241 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
242 /* make OS X utilities happy */
247 static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
249 exfat_debug("[%s]", __func__);
251 sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
252 sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
253 sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
254 sfs->f_bavail = exfat_count_free_clusters(&ef);
255 sfs->f_bfree = sfs->f_bavail;
256 sfs->f_namemax = EXFAT_NAME_MAX;
259 Below are fake values because in exFAT there is
260 a) no simple way to count files;
261 b) no such thing as inode;
262 So here we assume that inode = cluster.
264 sfs->f_files = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->spc_bits;
265 sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
266 sfs->f_ffree = sfs->f_bavail;
271 static void* fuse_exfat_init(struct fuse_conn_info* fci)
273 exfat_debug("[%s]", __func__);
274 #ifdef FUSE_CAP_BIG_WRITES
275 fci->want |= FUSE_CAP_BIG_WRITES;
280 static void fuse_exfat_destroy(void* unused)
282 exfat_debug("[%s]", __func__);
286 static void usage(const char* prog)
288 fprintf(stderr, "Usage: %s [-d] [-o options] [-v] <device> <dir>\n", prog);
292 static struct fuse_operations fuse_exfat_ops =
294 .getattr = fuse_exfat_getattr,
295 .truncate = fuse_exfat_truncate,
296 .readdir = fuse_exfat_readdir,
297 .open = fuse_exfat_open,
298 .release = fuse_exfat_release,
299 .read = fuse_exfat_read,
300 .write = fuse_exfat_write,
301 .unlink = fuse_exfat_unlink,
302 .rmdir = fuse_exfat_rmdir,
303 .mknod = fuse_exfat_mknod,
304 .mkdir = fuse_exfat_mkdir,
305 .rename = fuse_exfat_rename,
306 .utimens = fuse_exfat_utimens,
308 .chmod = fuse_exfat_chmod,
310 .statfs = fuse_exfat_statfs,
311 .init = fuse_exfat_init,
312 .destroy = fuse_exfat_destroy,
315 static char* add_option(char* options, const char* name, const char* value)
320 size = strlen(options) + strlen(name) + strlen(value) + 3;
322 size = strlen(options) + strlen(name) + 2;
324 options = realloc(options, size);
327 exfat_error("failed to reallocate options string");
330 strcat(options, ",");
331 strcat(options, name);
334 strcat(options, "=");
335 strcat(options, value);
340 static char* add_fsname_option(char* options, const char* spec)
342 char spec_abs[PATH_MAX];
344 if (realpath(spec, spec_abs) == NULL)
347 exfat_error("failed to get absolute path for `%s'", spec);
350 return add_option(options, "fsname", spec_abs);
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_fsname_option(options, 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 for (pp = argv + 1; *pp; pp++)
421 if (strcmp(*pp, "-o") == 0)
426 mount_options = add_option(mount_options, *pp, NULL);
427 if (mount_options == NULL)
430 else if (strcmp(*pp, "-d") == 0)
432 else if (strcmp(*pp, "-v") == 0)
435 puts("Copyright (C) 2010-2012 Andrew Nayenko");
438 else if (spec == NULL)
440 else if (mount_point == NULL)
448 if (spec == NULL || mount_point == NULL)
454 if (exfat_mount(&ef, spec, mount_options) != 0)
460 if (ef.ro == -1) /* read-only fallback was used */
462 mount_options = add_option(mount_options, "ro", NULL);
463 if (mount_options == NULL)
470 mount_options = add_fuse_options(mount_options, spec);
471 if (mount_options == NULL)
477 /* create arguments for fuse_mount() */
478 if (fuse_opt_add_arg(&mount_args, "exfat") != 0 ||
479 fuse_opt_add_arg(&mount_args, "-o") != 0 ||
480 fuse_opt_add_arg(&mount_args, mount_options) != 0)
489 /* create FUSE mount point */
490 fc = fuse_mount(mount_point, &mount_args);
491 fuse_opt_free_args(&mount_args);
498 /* create arguments for fuse_new() */
499 if (fuse_opt_add_arg(&newfs_args, "") != 0 ||
500 (debug && fuse_opt_add_arg(&newfs_args, "-d") != 0))
502 fuse_unmount(mount_point, fc);
507 /* create new FUSE file system */
508 fh = fuse_new(fc, &newfs_args, &fuse_exfat_ops,
509 sizeof(struct fuse_operations), NULL);
510 fuse_opt_free_args(&newfs_args);
513 fuse_unmount(mount_point, fc);
518 /* exit session on HUP, TERM and INT signals and ignore PIPE signal */
519 if (fuse_set_signal_handlers(fuse_get_session(fh)) != 0)
521 fuse_unmount(mount_point, fc);
524 exfat_error("failed to set signal handlers");
528 /* go to background (unless "-d" option is passed) and run FUSE
530 if (fuse_daemonize(debug) == 0)
532 if (fuse_loop(fh) != 0)
533 exfat_error("FUSE loop failure");
536 exfat_error("failed to daemonize");
538 fuse_remove_signal_handlers(fuse_get_session(fh));
539 /* note that fuse_unmount() must be called BEFORE fuse_destroy() */
540 fuse_unmount(mount_point, fc);