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);
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[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, EXFAT_NAME_MAX);
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)
158 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
159 if (exfat_generic_pread(&ef, get_node(fi), buffer, size, offset) != size)
164 static int fuse_exfat_write(const char* path, const char* buffer, size_t size,
165 off_t offset, struct fuse_file_info* fi)
167 exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
168 if (exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset) != size)
173 static int fuse_exfat_unlink(const char* path)
175 struct exfat_node* node;
178 exfat_debug("[%s] %s", __func__, path);
180 rc = exfat_lookup(&ef, &node, path);
184 rc = exfat_unlink(&ef, node);
185 exfat_put_node(&ef, node);
189 static int fuse_exfat_rmdir(const char* path)
191 struct exfat_node* node;
194 exfat_debug("[%s] %s", __func__, path);
196 rc = exfat_lookup(&ef, &node, path);
200 rc = exfat_rmdir(&ef, node);
201 exfat_put_node(&ef, node);
205 static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
207 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
208 return exfat_mknod(&ef, path);
211 static int fuse_exfat_mkdir(const char* path, mode_t mode)
213 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
214 return exfat_mkdir(&ef, path);
217 static int fuse_exfat_rename(const char* old_path, const char* new_path)
219 exfat_debug("[%s] %s => %s", __func__, old_path, new_path);
220 return exfat_rename(&ef, old_path, new_path);
223 static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
225 struct exfat_node* node;
228 exfat_debug("[%s] %s", __func__, path);
230 rc = exfat_lookup(&ef, &node, path);
234 exfat_utimes(node, tv);
235 exfat_put_node(&ef, node);
240 static int fuse_exfat_chmod(const char* path, mode_t mode)
242 exfat_debug("[%s] %s 0%ho", __func__, path, mode);
243 /* make OS X utilities happy */
248 static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
250 exfat_debug("[%s]", __func__);
252 sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
253 sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
254 sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
255 sfs->f_bavail = exfat_count_free_clusters(&ef);
256 sfs->f_bfree = sfs->f_bavail;
257 sfs->f_namemax = EXFAT_NAME_MAX;
260 Below are fake values because in exFAT there is
261 a) no simple way to count files;
262 b) no such thing as inode;
263 So here we assume that inode = cluster.
265 sfs->f_files = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->spc_bits;
266 sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
267 sfs->f_ffree = sfs->f_bavail;
272 static void* fuse_exfat_init(struct fuse_conn_info* fci)
274 exfat_debug("[%s]", __func__);
275 #ifdef FUSE_CAP_BIG_WRITES
276 fci->want |= FUSE_CAP_BIG_WRITES;
281 static void fuse_exfat_destroy(void* unused)
283 exfat_debug("[%s]", __func__);
287 static void usage(const char* prog)
289 fprintf(stderr, "Usage: %s [-d] [-o options] [-v] <device> <dir>\n", prog);
293 static struct fuse_operations fuse_exfat_ops =
295 .getattr = fuse_exfat_getattr,
296 .truncate = fuse_exfat_truncate,
297 .readdir = fuse_exfat_readdir,
298 .open = fuse_exfat_open,
299 .release = fuse_exfat_release,
300 .read = fuse_exfat_read,
301 .write = fuse_exfat_write,
302 .unlink = fuse_exfat_unlink,
303 .rmdir = fuse_exfat_rmdir,
304 .mknod = fuse_exfat_mknod,
305 .mkdir = fuse_exfat_mkdir,
306 .rename = fuse_exfat_rename,
307 .utimens = fuse_exfat_utimens,
309 .chmod = fuse_exfat_chmod,
311 .statfs = fuse_exfat_statfs,
312 .init = fuse_exfat_init,
313 .destroy = fuse_exfat_destroy,
316 static char* add_option(char* options, const char* name, const char* value)
321 size = strlen(options) + strlen(name) + strlen(value) + 3;
323 size = strlen(options) + strlen(name) + 2;
325 options = realloc(options, size);
328 exfat_error("failed to reallocate options string");
331 strcat(options, ",");
332 strcat(options, name);
335 strcat(options, "=");
336 strcat(options, value);
341 static char* add_fsname_option(char* options, const char* spec)
343 char* spec_abs = realpath(spec, NULL);
345 if (spec_abs == NULL)
348 exfat_error("failed to get absolute path for `%s'", spec);
351 options = add_option(options, "fsname", spec_abs);
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_fsname_option(options, 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 for (pp = argv + 1; *pp; pp++)
424 if (strcmp(*pp, "-o") == 0)
429 mount_options = add_option(mount_options, *pp, NULL);
430 if (mount_options == NULL)
433 else if (strcmp(*pp, "-d") == 0)
435 else if (strcmp(*pp, "-v") == 0)
438 puts("Copyright (C) 2010-2013 Andrew Nayenko");
441 else if (spec == NULL)
443 else if (mount_point == NULL)
451 if (spec == NULL || mount_point == NULL)
457 if (exfat_mount(&ef, spec, mount_options) != 0)
463 if (ef.ro == -1) /* read-only fallback was used */
465 mount_options = add_option(mount_options, "ro", NULL);
466 if (mount_options == NULL)
473 mount_options = add_fuse_options(mount_options, spec);
474 if (mount_options == NULL)
480 /* create arguments for fuse_mount() */
481 if (fuse_opt_add_arg(&mount_args, "exfat") != 0 ||
482 fuse_opt_add_arg(&mount_args, "-o") != 0 ||
483 fuse_opt_add_arg(&mount_args, mount_options) != 0)
492 /* create FUSE mount point */
493 fc = fuse_mount(mount_point, &mount_args);
494 fuse_opt_free_args(&mount_args);
501 /* create arguments for fuse_new() */
502 if (fuse_opt_add_arg(&newfs_args, "") != 0 ||
503 (debug && fuse_opt_add_arg(&newfs_args, "-d") != 0))
505 fuse_unmount(mount_point, fc);
510 /* create new FUSE file system */
511 fh = fuse_new(fc, &newfs_args, &fuse_exfat_ops,
512 sizeof(struct fuse_operations), NULL);
513 fuse_opt_free_args(&newfs_args);
516 fuse_unmount(mount_point, fc);
521 /* exit session on HUP, TERM and INT signals and ignore PIPE signal */
522 if (fuse_set_signal_handlers(fuse_get_session(fh)) != 0)
524 fuse_unmount(mount_point, fc);
527 exfat_error("failed to set signal handlers");
531 /* go to background (unless "-d" option is passed) and run FUSE
533 if (fuse_daemonize(debug) == 0)
535 if (fuse_loop(fh) != 0)
536 exfat_error("FUSE loop failure");
539 exfat_error("failed to daemonize");
541 fuse_remove_signal_handlers(fuse_get_session(fh));
542 /* note that fuse_unmount() must be called BEFORE fuse_destroy() */
543 fuse_unmount(mount_point, fc);