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";
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("[fuse_exfat_getattr] %s", 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("[fuse_exfat_truncate] %s, %"PRIu64, path, (uint64_t) 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("[fuse_exfat_readdir] %s", 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("[fuse_exfat_readdir] %s: %s, %"PRIu64" bytes, cluster %u",
122 name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
123 (uint64_t) 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("[fuse_exfat_open] %s", path);
139 rc = exfat_lookup(&ef, &node, path);
147 static int fuse_exfat_release(const char* path, struct fuse_file_info* fi)
149 exfat_put_node(&ef, get_node(fi));
153 static int fuse_exfat_read(const char* path, char* buffer, size_t size,
154 off_t offset, struct fuse_file_info* fi)
156 exfat_debug("[fuse_exfat_read] %s (%zu bytes)", path, size);
157 return exfat_generic_pread(&ef, get_node(fi), buffer, size, offset);
160 static int fuse_exfat_write(const char* path, const char* buffer, size_t size,
161 off_t offset, struct fuse_file_info* fi)
163 exfat_debug("[fuse_exfat_write] %s (%zu bytes)", path, size);
164 return exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
167 static int fuse_exfat_unlink(const char* path)
169 struct exfat_node* node;
172 exfat_debug("[fuse_exfat_unlink] %s", path);
174 rc = exfat_lookup(&ef, &node, path);
178 rc = exfat_unlink(&ef, node);
179 exfat_put_node(&ef, node);
183 static int fuse_exfat_rmdir(const char* path)
185 struct exfat_node* node;
188 exfat_debug("[fuse_exfat_rmdir] %s", path);
190 rc = exfat_lookup(&ef, &node, path);
194 rc = exfat_rmdir(&ef, node);
195 exfat_put_node(&ef, node);
199 static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
201 exfat_debug("[fuse_exfat_mknod] %s", path);
202 return exfat_mknod(&ef, path);
205 static int fuse_exfat_mkdir(const char* path, mode_t mode)
207 exfat_debug("[fuse_exfat_mkdir] %s", path);
208 return exfat_mkdir(&ef, path);
211 static int fuse_exfat_rename(const char* old_path, const char* new_path)
213 exfat_debug("[fuse_exfat_rename] %s => %s", old_path, new_path);
214 return exfat_rename(&ef, old_path, new_path);
217 static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
219 struct exfat_node* node;
222 exfat_debug("[fuse_exfat_utimens] %s", path);
224 rc = exfat_lookup(&ef, &node, path);
228 exfat_utimes(node, tv);
229 exfat_put_node(&ef, node);
233 static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
235 sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
236 sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
237 sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
238 sfs->f_bavail = exfat_count_free_clusters(&ef);
239 sfs->f_bfree = sfs->f_bavail;
240 sfs->f_namemax = EXFAT_NAME_MAX;
243 Below are fake values because in exFAT there is
244 a) no simple way to count files;
245 b) no such thing as inode;
246 So here we assume that inode = cluster.
248 sfs->f_files = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->spc_bits;
249 sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
250 sfs->f_ffree = sfs->f_bavail;
255 static void fuse_exfat_destroy(void* unused)
260 static void usage(const char* prog)
262 fprintf(stderr, "Usage: %s [-d] [-o options] [-v] <device> <dir>\n", prog);
266 static struct fuse_operations fuse_exfat_ops =
268 .getattr = fuse_exfat_getattr,
269 .truncate = fuse_exfat_truncate,
270 .readdir = fuse_exfat_readdir,
271 .open = fuse_exfat_open,
272 .release = fuse_exfat_release,
273 .read = fuse_exfat_read,
274 .write = fuse_exfat_write,
275 .unlink = fuse_exfat_unlink,
276 .rmdir = fuse_exfat_rmdir,
277 .mknod = fuse_exfat_mknod,
278 .mkdir = fuse_exfat_mkdir,
279 .rename = fuse_exfat_rename,
280 .utimens = fuse_exfat_utimens,
281 .statfs = fuse_exfat_statfs,
282 .destroy = fuse_exfat_destroy,
285 static char* add_option(char* options, const char* name, const char* value)
290 size = strlen(options) + strlen(name) + strlen(value) + 3;
292 size = strlen(options) + strlen(name) + 2;
294 options = realloc(options, size);
297 exfat_error("failed to reallocate options string");
300 strcat(options, ",");
301 strcat(options, name);
304 strcat(options, "=");
305 strcat(options, value);
310 static char* add_fsname_option(char* options, const char* spec)
312 char spec_abs[PATH_MAX];
314 if (realpath(spec, spec_abs) == NULL)
317 exfat_error("failed to get absolute path for `%s'", spec);
320 return add_option(options, "fsname", spec_abs);
323 static char* add_user_option(char* options)
330 pw = getpwuid(getuid());
331 if (pw == NULL || pw->pw_name == NULL)
334 exfat_error("failed to determine username");
337 return add_option(options, "user", pw->pw_name);
340 static char* add_blksize_option(char* options, long cluster_size)
342 long page_size = sysconf(_SC_PAGESIZE);
348 snprintf(blksize, sizeof(blksize), "%ld", MIN(page_size, cluster_size));
349 return add_option(options, "blksize", blksize);
352 static char* add_fuse_options(char* options, const char* spec)
354 options = add_fsname_option(options, spec);
357 options = add_user_option(options);
360 options = add_blksize_option(options, CLUSTER_SIZE(*ef.sb));
367 int main(int argc, char* argv[])
369 struct fuse_args mount_args = FUSE_ARGS_INIT(0, NULL);
370 struct fuse_args newfs_args = FUSE_ARGS_INIT(0, NULL);
371 const char* spec = NULL;
372 const char* mount_point = NULL;
375 struct fuse_chan* fc = NULL;
376 struct fuse* fh = NULL;
379 printf("FUSE exfat %u.%u.%u\n",
380 EXFAT_VERSION_MAJOR, EXFAT_VERSION_MINOR, EXFAT_VERSION_PATCH);
382 mount_options = strdup(default_options);
383 if (mount_options == NULL)
385 exfat_error("failed to allocate options string");
389 for (pp = argv + 1; *pp; pp++)
391 if (strcmp(*pp, "-o") == 0)
396 mount_options = add_option(mount_options, *pp, NULL);
397 if (mount_options == NULL)
400 else if (strcmp(*pp, "-d") == 0)
402 else if (strcmp(*pp, "-v") == 0)
405 puts("Copyright (C) 2010-2012 Andrew Nayenko");
408 else if (spec == NULL)
410 else if (mount_point == NULL)
418 if (spec == NULL || mount_point == NULL)
424 if (exfat_mount(&ef, spec, mount_options) != 0)
432 mount_options = add_option(mount_options, "ro", NULL);
433 if (mount_options == NULL)
440 mount_options = add_fuse_options(mount_options, spec);
441 if (mount_options == NULL)
447 /* create arguments for fuse_mount() */
448 if (fuse_opt_add_arg(&mount_args, "exfat") != 0 ||
449 fuse_opt_add_arg(&mount_args, "-o") != 0 ||
450 fuse_opt_add_arg(&mount_args, mount_options) != 0)
459 /* create FUSE mount point */
460 fc = fuse_mount(mount_point, &mount_args);
461 fuse_opt_free_args(&mount_args);
468 /* create arguments for fuse_new() */
469 if (fuse_opt_add_arg(&newfs_args, "") != 0 ||
470 (debug && fuse_opt_add_arg(&newfs_args, "-d") != 0))
472 fuse_unmount(mount_point, fc);
477 /* create new FUSE file system */
478 fh = fuse_new(fc, &newfs_args, &fuse_exfat_ops,
479 sizeof(struct fuse_operations), NULL);
480 fuse_opt_free_args(&newfs_args);
483 fuse_unmount(mount_point, fc);
488 /* exit session on HUP, TERM and INT signals and ignore PIPE signal */
489 if (fuse_set_signal_handlers(fuse_get_session(fh)))
491 fuse_unmount(mount_point, fc);
497 /* go to background unless "-d" option is passed */
498 fuse_daemonize(debug);
503 /* it's quite illogical but fuse_unmount() must be called BEFORE
505 fuse_unmount(mount_point, fc);