FUSE-based exFAT implementation. Requires FUSE 2.6 or later.
Free exFAT implementation.
- Copyright (C) 2010-2015 Andrew Nayenko
+ Copyright (C) 2010-2018 Andrew Nayenko
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
#include <unistd.h>
#ifndef DEBUG
- #define exfat_debug(format, ...)
+ #define exfat_debug(format, ...) do {} while (0)
#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 int fuse_exfat_readdir(const char* path, void* buffer,
- fuse_fill_dir_t filler, off_t offset, struct fuse_file_info* fi)
+ fuse_fill_dir_t filler, UNUSED off_t offset,
+ UNUSED struct fuse_file_info* fi)
{
struct exfat_node* parent;
struct exfat_node* node;
struct exfat_iterator it;
int rc;
- char name[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
+ char name[EXFAT_UTF8_NAME_BUFFER_MAX];
+ struct stat stbuf;
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;
}
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, sizeof(name) - 1);
+ exfat_get_name(node, name);
exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
- name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
+ name, node->is_contiguous ? "contiguous" : "fragmented",
node->size, node->start_cluster);
- filler(buffer, name, NULL, 0);
+ exfat_stat(&ef, node, &stbuf);
+ filler(buffer, name, &stbuf, 0);
exfat_put_node(&ef, node);
}
exfat_closedir(&ef, &it);
return 0;
}
-static int fuse_exfat_create(const char* path, mode_t mode,
+static int fuse_exfat_create(const char* path, UNUSED mode_t mode,
struct fuse_file_info* fi)
{
struct exfat_node* node;
return 0;
}
-static int fuse_exfat_release(const char* path, struct fuse_file_info* fi)
+static int fuse_exfat_release(UNUSED const char* path,
+ struct fuse_file_info* fi)
{
/*
This handler is called by FUSE on close() syscall. If the FUSE
return 0; /* FUSE ignores this return value */
}
-static int fuse_exfat_flush(const char* path, struct fuse_file_info* fi)
+static int fuse_exfat_flush(UNUSED const char* path, struct fuse_file_info* fi)
{
/*
This handler may be called by FUSE on close() syscall. FUSE also deals
return exfat_flush_node(&ef, get_node(fi));
}
-static int fuse_exfat_fsync(const char* path, int datasync,
- struct fuse_file_info *fi)
+static int fuse_exfat_fsync(UNUSED const char* path, UNUSED int datasync,
+ UNUSED 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)
+static int fuse_exfat_read(UNUSED const char* path, char* buffer,
+ size_t size, off_t offset, struct fuse_file_info* fi)
{
- ssize_t ret;
-
exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
- ret = exfat_generic_pread(&ef, get_node(fi), buffer, size, offset);
- if (ret < 0)
- return -EIO;
- return ret;
+ 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)
+static int fuse_exfat_write(UNUSED const char* path, const char* buffer,
+ size_t size, off_t offset, struct fuse_file_info* fi)
{
- ssize_t ret;
-
exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
- ret = exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
- if (ret < 0)
- return -EIO;
- return ret;
+ return exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
}
static int fuse_exfat_unlink(const char* path)
return exfat_cleanup_node(&ef, node);
}
-static int fuse_exfat_mknod(const char* path, mode_t mode, dev_t dev)
+static int fuse_exfat_mknod(const char* path, UNUSED mode_t mode,
+ UNUSED dev_t dev)
{
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)
+static int fuse_exfat_mkdir(const char* path, UNUSED mode_t mode)
{
exfat_debug("[%s] %s 0%ho", __func__, path, mode);
return exfat_mkdir(&ef, path);
return rc;
}
-static int fuse_exfat_chmod(const char* path, mode_t mode)
+static int fuse_exfat_chmod(UNUSED const char* path, mode_t mode)
{
const mode_t VALID_MODE_MASK = S_IFREG | S_IFDIR |
S_IRWXU | S_IRWXG | S_IRWXO;
return 0;
}
-static int fuse_exfat_chown(const char* path, uid_t uid, gid_t gid)
+static int fuse_exfat_chown(UNUSED 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 0;
}
-static int fuse_exfat_statfs(const char* path, struct statvfs* sfs)
+static int fuse_exfat_statfs(UNUSED const char* path, struct statvfs* sfs)
{
exfat_debug("[%s]", __func__);
#ifdef FUSE_CAP_BIG_WRITES
fci->want |= FUSE_CAP_BIG_WRITES;
#endif
+
+ /* mark super block as dirty; failure isn't a big deal */
+ exfat_soil_super_block(&ef);
+
return NULL;
}
-static void fuse_exfat_destroy(void* unused)
+static void fuse_exfat_destroy(UNUSED void* unused)
{
exfat_debug("[%s]", __func__);
exfat_unmount(&ef);
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;
+}
+
+#if defined(__linux__)
static char* add_user_option(char* options)
{
struct passwd* pw;
}
return add_option(options, "user", pw->pw_name);
}
+#endif
+#if defined(__linux__)
static char* add_blksize_option(char* options, long cluster_size)
{
long page_size = sysconf(_SC_PAGESIZE);
snprintf(blksize, sizeof(blksize), "%ld", MIN(page_size, cluster_size));
return add_option(options, "blksize", blksize);
}
+#endif
-static char* add_fuse_options(char* options, const char* spec)
+static char* add_fuse_options(char* options, const char* spec, bool ro)
{
- options = add_option(options, "fsname", spec);
+ options = add_fsname_option(options, spec);
+ if (options == NULL)
+ return NULL;
+ options = add_ro_option(options, ro);
if (options == NULL)
return NULL;
+#if defined(__linux__)
options = add_user_option(options);
if (options == NULL)
return NULL;
options = add_blksize_option(options, CLUSTER_SIZE(*ef.sb));
if (options == NULL)
return NULL;
-
+#endif
return options;
}
+static char* add_passthrough_fuse_options(char* fuse_options,
+ const char* options)
+{
+ const char* passthrough_list[] =
+ {
+#if defined(__FreeBSD__)
+ "automounted",
+#endif
+ "nonempty",
+ NULL
+ };
+ int i;
+
+ for (i = 0; passthrough_list[i] != NULL; i++)
+ if (exfat_match_option(options, passthrough_list[i]))
+ {
+ fuse_options = add_option(fuse_options, passthrough_list[i], NULL);
+ if (fuse_options == NULL)
+ return NULL;
+ }
+
+ return fuse_options;
+}
+
+static int fuse_exfat_main(char* mount_options, char* mount_point)
+{
+ char* argv[] = {"exfat", "-s", "-o", mount_options, mount_point, NULL};
+ return fuse_main(sizeof(argv) / sizeof(argv[0]) - 1, argv,
+ &fuse_exfat_ops, NULL);
+}
+
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;
- char* mount_options;
- int debug = 0;
- struct fuse_chan* fc = NULL;
- struct fuse* fh = NULL;
+ char* mount_point = NULL;
+ char* fuse_options;
+ char* exfat_options;
int opt;
+ int rc;
printf("FUSE exfat %s\n", VERSION);
- mount_options = strdup(default_options);
- if (mount_options == NULL)
+ fuse_options = strdup("allow_other,"
+#if defined(__linux__) || defined(__FreeBSD__)
+ "big_writes,"
+#endif
+#if defined(__linux__)
+ "blkdev,"
+#endif
+ "default_permissions");
+ exfat_options = strdup("ro_fallback");
+ if (fuse_options == NULL || exfat_options == NULL)
{
+ free(fuse_options);
+ free(exfat_options);
exfat_error("failed to allocate options string");
return 1;
}
switch (opt)
{
case 'd':
- debug = 1;
+ fuse_options = add_option(fuse_options, "debug", NULL);
+ if (fuse_options == NULL)
+ {
+ free(exfat_options);
+ return 1;
+ }
break;
case 'n':
break;
case 'o':
- mount_options = add_option(mount_options, optarg, NULL);
- if (mount_options == NULL)
+ exfat_options = add_option(exfat_options, optarg, NULL);
+ if (exfat_options == NULL)
+ {
+ free(fuse_options);
return 1;
+ }
+ fuse_options = add_passthrough_fuse_options(fuse_options, optarg);
+ if (fuse_options == NULL)
+ {
+ free(exfat_options);
+ return 1;
+ }
break;
case 'V':
- free(mount_options);
- puts("Copyright (C) 2010-2015 Andrew Nayenko");
+ free(exfat_options);
+ free(fuse_options);
+ puts("Copyright (C) 2010-2018 Andrew Nayenko");
return 0;
case 'v':
break;
default:
- free(mount_options);
+ free(exfat_options);
+ free(fuse_options);
usage(argv[0]);
break;
}
}
if (argc - optind != 2)
{
- free(mount_options);
+ free(exfat_options);
+ free(fuse_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;
- }
-
- if (ef.ro == -1) /* read-only fallback was used */
- {
- mount_options = add_option(mount_options, "ro", NULL);
- if (mount_options == NULL)
- {
- exfat_unmount(&ef);
- return 1;
- }
- }
-
- mount_options = add_fuse_options(mount_options, spec);
- 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)
+ if (exfat_mount(&ef, spec, exfat_options) != 0)
{
- exfat_unmount(&ef);
- free(mount_options);
+ free(exfat_options);
+ free(fuse_options);
return 1;
}
- free(mount_options);
+ free(exfat_options);
- /* create FUSE mount point */
- fc = fuse_mount(mount_point, &mount_args);
- fuse_opt_free_args(&mount_args);
- if (fc == NULL)
+ fuse_options = add_fuse_options(fuse_options, spec, ef.ro != 0);
+ if (fuse_options == 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;
- }
+ /* let FUSE do all its wizardry */
+ rc = fuse_exfat_main(fuse_options, mount_point);
- /* create new FUSE file system */
- fh = fuse_new(fc, &newfs_args, &fuse_exfat_ops,
- sizeof(struct fuse_operations), NULL);
- fuse_opt_free_args(&newfs_args);
- 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)) != 0)
- {
- fuse_unmount(mount_point, fc);
- fuse_destroy(fh);
- exfat_unmount(&ef);
- exfat_error("failed to set signal handlers");
- return 1;
- }
-
- /* go to background (unless "-d" option is passed) and run FUSE
- main loop */
- if (fuse_daemonize(debug) == 0)
- {
- if (fuse_loop(fh) != 0)
- exfat_error("FUSE loop failure");
- }
- else
- exfat_error("failed to daemonize");
-
- 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;
+ free(fuse_options);
+ return rc;
}