main.c (01.09.09)
FUSE-based exFAT implementation. Requires FUSE 2.6 or later.
- Copyright (C) 2009, 2010 Andrew Nayenko
+ Free exFAT implementation.
+ Copyright (C) 2010-2018 Andrew Nayenko
- This program is free software: you can redistribute it and/or modify
+ This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
+ the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#include <exfat.h>
+#define FUSE_USE_VERSION 26
#include <fuse.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <exfat.h>
#include <inttypes.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <unistd.h>
-#define exfat_debug(format, ...)
+#ifndef DEBUG
+ #define exfat_debug(format, ...)
+#endif
#if !defined(FUSE_VERSION) || (FUSE_VERSION < 26)
#error FUSE 2.6 or later is required
#endif
+const char* default_options = "ro_fallback,allow_other,blkdev,big_writes,"
+ "default_permissions";
+
struct exfat ef;
static struct exfat_node* get_node(const struct fuse_file_info* fi)
static void set_node(struct fuse_file_info* fi, struct exfat_node* node)
{
fi->fh = (uint64_t) (size_t) node;
+ fi->keep_cache = 1;
}
static int fuse_exfat_getattr(const char* path, struct stat* stbuf)
struct exfat_node* node;
int rc;
- exfat_debug("[fuse_exfat_getattr] %s", path);
+ exfat_debug("[%s] %s", __func__, path);
rc = exfat_lookup(&ef, &node, path);
if (rc != 0)
struct exfat_node* node;
int rc;
- exfat_debug("[fuse_exfat_truncate] %s, %"PRIu64, path, (uint64_t) size);
+ exfat_debug("[%s] %s, %"PRId64, __func__, path, size);
rc = exfat_lookup(&ef, &node, path);
if (rc != 0)
return rc;
- rc = exfat_truncate(&ef, node, size);
+ rc = exfat_truncate(&ef, node, size, true);
+ if (rc != 0)
+ {
+ exfat_flush_node(&ef, node); /* ignore return code */
+ exfat_put_node(&ef, node);
+ return rc;
+ }
+ rc = exfat_flush_node(&ef, node);
exfat_put_node(&ef, node);
return rc;
}
struct exfat_node* node;
struct exfat_iterator it;
int rc;
- char name[EXFAT_NAME_MAX + 1];
+ char name[EXFAT_UTF8_NAME_BUFFER_MAX];
+ struct stat stbuf;
- exfat_debug("[fuse_exfat_readdir] %s", path);
+ exfat_debug("[%s] %s", __func__, path);
rc = exfat_lookup(&ef, &parent, path);
if (rc != 0)
return rc;
- if (!(parent->flags & EXFAT_ATTRIB_DIR))
+ if (!(parent->attrib & EXFAT_ATTRIB_DIR))
{
exfat_put_node(&ef, parent);
- exfat_error("`%s' is not a directory (0x%x)", path, parent->flags);
+ exfat_error("'%s' is not a directory (%#hx)", path, parent->attrib);
return -ENOTDIR;
}
if (rc != 0)
{
exfat_put_node(&ef, parent);
- exfat_error("failed to open directory `%s'", path);
+ exfat_error("failed to open directory '%s'", path);
return rc;
}
- while ((node = exfat_readdir(&ef, &it)))
+ while ((node = exfat_readdir(&it)))
{
- exfat_get_name(node, name, EXFAT_NAME_MAX);
- exfat_debug("[fuse_exfat_readdir] %s: %s, %"PRIu64" bytes, cluster %u",
- name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
- (uint64_t) node->size, node->start_cluster);
- filler(buffer, name, NULL, 0);
+ exfat_get_name(node, name);
+ exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
+ name, node->is_contiguous ? "contiguous" : "fragmented",
+ node->size, node->start_cluster);
+ exfat_stat(&ef, node, &stbuf);
+ filler(buffer, name, &stbuf, 0);
exfat_put_node(&ef, node);
}
exfat_closedir(&ef, &it);
struct exfat_node* node;
int rc;
- exfat_debug("[fuse_exfat_open] %s", path);
+ exfat_debug("[%s] %s", __func__, path);
+
+ rc = exfat_lookup(&ef, &node, path);
+ if (rc != 0)
+ return rc;
+ set_node(fi, node);
+ return 0;
+}
+
+static int fuse_exfat_create(const char* path, mode_t mode,
+ struct fuse_file_info* fi)
+{
+ struct exfat_node* node;
+ int rc;
+
+ exfat_debug("[%s] %s 0%ho", __func__, path, mode);
+ rc = exfat_mknod(&ef, path);
+ if (rc != 0)
+ return rc;
rc = exfat_lookup(&ef, &node, path);
if (rc != 0)
return rc;
static int fuse_exfat_release(const char* path, struct fuse_file_info* fi)
{
+ /*
+ This handler is called by FUSE on close() syscall. If the FUSE
+ implementation does not call flush handler, we will flush node here.
+ But in this case we will not be able to return an error to the caller.
+ See fuse_exfat_flush() below.
+ */
+ exfat_debug("[%s] %s", __func__, path);
+ exfat_flush_node(&ef, get_node(fi));
exfat_put_node(&ef, get_node(fi));
- return 0;
+ return 0; /* FUSE ignores this return value */
+}
+
+static int fuse_exfat_flush(const char* path, struct fuse_file_info* fi)
+{
+ /*
+ This handler may be called by FUSE on close() syscall. FUSE also deals
+ with removals of open files, so we don't free clusters on close but
+ only on rmdir and unlink. If the FUSE implementation does not call this
+ handler we will flush node on release. See fuse_exfat_relase() above.
+ */
+ exfat_debug("[%s] %s", __func__, path);
+ return exfat_flush_node(&ef, get_node(fi));
+}
+
+static int fuse_exfat_fsync(const char* path, int datasync,
+ struct fuse_file_info *fi)
+{
+ int rc;
+
+ exfat_debug("[%s] %s", __func__, path);
+ rc = exfat_flush_nodes(&ef);
+ if (rc != 0)
+ return rc;
+ rc = exfat_flush(&ef);
+ if (rc != 0)
+ return rc;
+ return exfat_fsync(ef.dev);
}
static int fuse_exfat_read(const char* path, char* buffer, size_t size,
off_t offset, struct fuse_file_info* fi)
{
- exfat_debug("[fuse_exfat_read] %s (%zu bytes)", path, size);
- return exfat_read(&ef, get_node(fi), buffer, size, offset);
+ exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
+ return exfat_generic_pread(&ef, get_node(fi), buffer, size, offset);
}
static int fuse_exfat_write(const char* path, const char* buffer, size_t size,
off_t offset, struct fuse_file_info* fi)
{
- exfat_debug("[fuse_exfat_write] %s (%zu bytes)", path, size);
- return exfat_write(&ef, get_node(fi), buffer, size, offset);
+ exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
+ return exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
}
static int fuse_exfat_unlink(const char* path)
struct exfat_node* node;
int rc;
- exfat_debug("[fuse_exfat_unlink] %s", path);
+ exfat_debug("[%s] %s", __func__, path);
rc = exfat_lookup(&ef, &node, path);
if (rc != 0)
rc = exfat_unlink(&ef, node);
exfat_put_node(&ef, node);
- return rc;
+ if (rc != 0)
+ return rc;
+ return exfat_cleanup_node(&ef, node);
}
static int fuse_exfat_rmdir(const char* path)
struct exfat_node* node;
int rc;
- exfat_debug("[fuse_exfat_rmdir] %s", path);
+ exfat_debug("[%s] %s", __func__, path);
rc = exfat_lookup(&ef, &node, path);
if (rc != 0)
rc = exfat_rmdir(&ef, node);
exfat_put_node(&ef, node);
- return rc;
+ if (rc != 0)
+ return rc;
+ return exfat_cleanup_node(&ef, node);
}
static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
{
- exfat_debug("[fuse_exfat_mknod] %s", path);
+ exfat_debug("[%s] %s 0%ho", __func__, path, mode);
return exfat_mknod(&ef, path);
}
static int fuse_exfat_mkdir(const char* path, mode_t mode)
{
- exfat_debug("[fuse_exfat_mkdir] %s", path);
+ exfat_debug("[%s] %s 0%ho", __func__, path, mode);
return exfat_mkdir(&ef, path);
}
static int fuse_exfat_rename(const char* old_path, const char* new_path)
{
- exfat_debug("[fuse_exfat_rename] %s => %s", old_path, new_path);
+ exfat_debug("[%s] %s => %s", __func__, old_path, new_path);
return exfat_rename(&ef, old_path, new_path);
}
struct exfat_node* node;
int rc;
- exfat_debug("[fuse_exfat_utimens] %s", path);
+ exfat_debug("[%s] %s", __func__, path);
rc = exfat_lookup(&ef, &node, path);
if (rc != 0)
return rc;
exfat_utimes(node, tv);
+ rc = exfat_flush_node(&ef, node);
exfat_put_node(&ef, node);
+ return rc;
+}
+
+static int fuse_exfat_chmod(const char* path, mode_t mode)
+{
+ const mode_t VALID_MODE_MASK = S_IFREG | S_IFDIR |
+ S_IRWXU | S_IRWXG | S_IRWXO;
+
+ exfat_debug("[%s] %s 0%ho", __func__, path, mode);
+ if (mode & ~VALID_MODE_MASK)
+ return -EPERM;
+ return 0;
+}
+
+static int fuse_exfat_chown(const char* path, uid_t uid, gid_t gid)
+{
+ exfat_debug("[%s] %s %u:%u", __func__, path, uid, gid);
+ if (uid != ef.uid || gid != ef.gid)
+ return -EPERM;
return 0;
}
static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
{
- const uint64_t block_count = le64_to_cpu(ef.sb->block_count);
+ exfat_debug("[%s]", __func__);
- sfs->f_bsize = BLOCK_SIZE(*ef.sb);
+ sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
- sfs->f_blocks = block_count;
- sfs->f_bavail = block_count - ef.sb->allocated_percent * block_count / 100;
+ sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
+ sfs->f_bavail = exfat_count_free_clusters(&ef);
sfs->f_bfree = sfs->f_bavail;
sfs->f_namemax = EXFAT_NAME_MAX;
b) no such thing as inode;
So here we assume that inode = cluster.
*/
- sfs->f_files = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->bpc_bits;
- sfs->f_favail = sfs->f_bfree >> ef.sb->bpc_bits;
+ sfs->f_files = le32_to_cpu(ef.sb->cluster_count);
+ sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
sfs->f_ffree = sfs->f_bavail;
return 0;
}
+static void* fuse_exfat_init(struct fuse_conn_info* fci)
+{
+ exfat_debug("[%s]", __func__);
+#ifdef FUSE_CAP_BIG_WRITES
+ fci->want |= FUSE_CAP_BIG_WRITES;
+#endif
+ return NULL;
+}
+
static void fuse_exfat_destroy(void* unused)
{
+ exfat_debug("[%s]", __func__);
exfat_unmount(&ef);
}
static void usage(const char* prog)
{
- fprintf(stderr, "Usage: %s <spec> <mountpoint> [-o options]\n", prog);
+ fprintf(stderr, "Usage: %s [-d] [-o options] [-V] <device> <dir>\n", prog);
exit(1);
}
.truncate = fuse_exfat_truncate,
.readdir = fuse_exfat_readdir,
.open = fuse_exfat_open,
+ .create = fuse_exfat_create,
.release = fuse_exfat_release,
+ .flush = fuse_exfat_flush,
+ .fsync = fuse_exfat_fsync,
+ .fsyncdir = fuse_exfat_fsync,
.read = fuse_exfat_read,
.write = fuse_exfat_write,
.unlink = fuse_exfat_unlink,
.mkdir = fuse_exfat_mkdir,
.rename = fuse_exfat_rename,
.utimens = fuse_exfat_utimens,
+ .chmod = fuse_exfat_chmod,
+ .chown = fuse_exfat_chown,
.statfs = fuse_exfat_statfs,
+ .init = fuse_exfat_init,
.destroy = fuse_exfat_destroy,
};
+static char* add_option(char* options, const char* name, const char* value)
+{
+ size_t size;
+ char* optionsf = options;
+
+ if (value)
+ size = strlen(options) + strlen(name) + strlen(value) + 3;
+ else
+ size = strlen(options) + strlen(name) + 2;
+
+ options = realloc(options, size);
+ if (options == NULL)
+ {
+ free(optionsf);
+ exfat_error("failed to reallocate options string");
+ return NULL;
+ }
+ strcat(options, ",");
+ strcat(options, name);
+ if (value)
+ {
+ strcat(options, "=");
+ strcat(options, value);
+ }
+ return options;
+}
+
+static void escape(char* escaped, const char* orig)
+{
+ do
+ {
+ if (*orig == ',' || *orig == '\\')
+ *escaped++ = '\\';
+ }
+ while ((*escaped++ = *orig++));
+}
+
+static char* add_fsname_option(char* options, const char* spec)
+{
+ /* escaped string cannot be more than twice as big as the original one */
+ char* escaped = malloc(strlen(spec) * 2 + 1);
+
+ if (escaped == NULL)
+ {
+ free(options);
+ exfat_error("failed to allocate escaped string for %s", spec);
+ return NULL;
+ }
+
+ /* on some platforms (e.g. Android, Solaris) device names can contain
+ commas */
+ escape(escaped, spec);
+ options = add_option(options, "fsname", escaped);
+ free(escaped);
+ return options;
+}
+
+static char* add_ro_option(char* options, bool ro)
+{
+ return ro ? add_option(options, "ro", NULL) : options;
+}
+
+static char* add_user_option(char* options)
+{
+ struct passwd* pw;
+
+ if (getuid() == 0)
+ return options;
+
+ pw = getpwuid(getuid());
+ if (pw == NULL || pw->pw_name == NULL)
+ {
+ free(options);
+ exfat_error("failed to determine username");
+ return NULL;
+ }
+ return add_option(options, "user", pw->pw_name);
+}
+
+static char* add_blksize_option(char* options, long cluster_size)
+{
+ long page_size = sysconf(_SC_PAGESIZE);
+ char blksize[20];
+
+ if (page_size < 1)
+ page_size = 0x1000;
+
+ snprintf(blksize, sizeof(blksize), "%ld", MIN(page_size, cluster_size));
+ return add_option(options, "blksize", blksize);
+}
+
+static char* add_fuse_options(char* options, const char* spec, bool ro)
+{
+ options = add_fsname_option(options, spec);
+ if (options == NULL)
+ return NULL;
+ options = add_ro_option(options, ro);
+ if (options == NULL)
+ return NULL;
+ options = add_user_option(options);
+ if (options == NULL)
+ return NULL;
+ options = add_blksize_option(options, CLUSTER_SIZE(*ef.sb));
+ if (options == NULL)
+ return NULL;
+
+ return options;
+}
+
int main(int argc, char* argv[])
{
struct fuse_args mount_args = FUSE_ARGS_INIT(0, NULL);
struct fuse_args newfs_args = FUSE_ARGS_INIT(0, NULL);
const char* spec = NULL;
const char* mount_point = NULL;
- const char* mount_options = "";
+ char* mount_options;
int debug = 0;
struct fuse_chan* fc = NULL;
struct fuse* fh = NULL;
- char** pp;
+ int opt;
+
+ printf("FUSE exfat %s\n", VERSION);
- printf("FUSE exfat %u.%u.%u\n",
- EXFAT_VERSION_MAJOR, EXFAT_VERSION_MINOR, EXFAT_VERSION_PATCH);
+ mount_options = strdup(default_options);
+ if (mount_options == NULL)
+ {
+ exfat_error("failed to allocate options string");
+ return 1;
+ }
- for (pp = argv + 1; *pp; pp++)
+ while ((opt = getopt(argc, argv, "dno:Vv")) != -1)
{
- if (strcmp(*pp, "-o") == 0)
+ switch (opt)
{
- pp++;
- if (*pp == NULL)
- usage(argv[0]);
- mount_options = *pp;
- }
- else if (strcmp(*pp, "-d") == 0)
+ case 'd':
debug = 1;
- else if (spec == NULL)
- spec = *pp;
- else if (mount_point == NULL)
- mount_point = *pp;
- else
+ break;
+ case 'n':
+ break;
+ case 'o':
+ mount_options = add_option(mount_options, optarg, NULL);
+ if (mount_options == NULL)
+ return 1;
+ break;
+ case 'V':
+ free(mount_options);
+ puts("Copyright (C) 2010-2018 Andrew Nayenko");
+ return 0;
+ case 'v':
+ break;
+ default:
+ free(mount_options);
usage(argv[0]);
+ break;
+ }
}
- if (spec == NULL || mount_point == NULL)
+ if (argc - optind != 2)
+ {
+ free(mount_options);
usage(argv[0]);
+ }
+ spec = argv[optind];
+ mount_point = argv[optind + 1];
+
+ if (exfat_mount(&ef, spec, mount_options) != 0)
+ {
+ free(mount_options);
+ return 1;
+ }
+
+ mount_options = add_fuse_options(mount_options, spec, (ef.ro != 0));
+ if (mount_options == NULL)
+ {
+ exfat_unmount(&ef);
+ return 1;
+ }
/* create arguments for fuse_mount() */
if (fuse_opt_add_arg(&mount_args, "exfat") != 0 ||
fuse_opt_add_arg(&mount_args, "-o") != 0 ||
fuse_opt_add_arg(&mount_args, mount_options) != 0)
+ {
+ exfat_unmount(&ef);
+ free(mount_options);
return 1;
+ }
+
+ free(mount_options);
/* create FUSE mount point */
fc = fuse_mount(mount_point, &mount_args);
fuse_opt_free_args(&mount_args);
if (fc == NULL)
+ {
+ exfat_unmount(&ef);
return 1;
+ }
/* create arguments for fuse_new() */
if (fuse_opt_add_arg(&newfs_args, "") != 0 ||
(debug && fuse_opt_add_arg(&newfs_args, "-d") != 0))
{
fuse_unmount(mount_point, fc);
+ exfat_unmount(&ef);
return 1;
}
if (fh == NULL)
{
fuse_unmount(mount_point, fc);
+ exfat_unmount(&ef);
return 1;
}
/* exit session on HUP, TERM and INT signals and ignore PIPE signal */
- if (fuse_set_signal_handlers(fuse_get_session(fh)))
+ if (fuse_set_signal_handlers(fuse_get_session(fh)) != 0)
{
fuse_unmount(mount_point, fc);
fuse_destroy(fh);
+ exfat_unmount(&ef);
+ exfat_error("failed to set signal handlers");
return 1;
}
- if (exfat_mount(&ef, spec, mount_options) != 0)
+ /* go to background (unless "-d" option is passed) and run FUSE
+ main loop */
+ if (fuse_daemonize(debug) == 0)
{
- fuse_unmount(mount_point, fc);
- fuse_destroy(fh);
- return 1;
+ if (fuse_loop(fh) != 0)
+ exfat_error("FUSE loop failure");
}
+ else
+ exfat_error("failed to daemonize");
- /* go to background unless "-d" option is passed */
- fuse_daemonize(debug);
-
- /* FUSE main loop */
- fuse_loop(fh);
-
- /* it's quite illogical but fuse_unmount() must be called BEFORE
- fuse_destroy() */
+ fuse_remove_signal_handlers(fuse_get_session(fh));
+ /* note that fuse_unmount() must be called BEFORE fuse_destroy() */
fuse_unmount(mount_point, fc);
fuse_destroy(fh);
return 0;
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