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-rw-r--r--exfat/fuse/main.c618
1 files changed, 618 insertions, 0 deletions
diff --git a/exfat/fuse/main.c b/exfat/fuse/main.c
new file mode 100644
index 000000000..aad082b68
--- /dev/null
+++ b/exfat/fuse/main.c
@@ -0,0 +1,618 @@
+/*
+ main.c (01.09.09)
+ FUSE-based exFAT implementation. Requires FUSE 2.6 or later.
+
+ Free exFAT implementation.
+ Copyright (C) 2010-2015 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
+ 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,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ 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, 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 <inttypes.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <unistd.h>
+
+#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)
+{
+ return (struct exfat_node*) (size_t) fi->fh;
+}
+
+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("[%s] %s", __func__, path);
+
+ rc = exfat_lookup(&ef, &node, path);
+ if (rc != 0)
+ return rc;
+
+ exfat_stat(&ef, node, stbuf);
+ exfat_put_node(&ef, node);
+ return 0;
+}
+
+static int fuse_exfat_truncate(const char* path, off_t size)
+{
+ struct exfat_node* node;
+ int rc;
+
+ 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, 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;
+}
+
+static int fuse_exfat_readdir(const char* path, void* buffer,
+ fuse_fill_dir_t filler, off_t offset, 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];
+
+ exfat_debug("[%s] %s", __func__, path);
+
+ rc = exfat_lookup(&ef, &parent, path);
+ if (rc != 0)
+ return rc;
+ if (!(parent->flags & EXFAT_ATTRIB_DIR))
+ {
+ exfat_put_node(&ef, parent);
+ exfat_error("'%s' is not a directory (0x%x)", path, parent->flags);
+ return -ENOTDIR;
+ }
+
+ filler(buffer, ".", NULL, 0);
+ filler(buffer, "..", NULL, 0);
+
+ rc = exfat_opendir(&ef, parent, &it);
+ if (rc != 0)
+ {
+ exfat_put_node(&ef, parent);
+ exfat_error("failed to open directory '%s'", path);
+ return rc;
+ }
+ while ((node = exfat_readdir(&ef, &it)))
+ {
+ exfat_get_name(node, name, sizeof(name) - 1);
+ exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
+ name, IS_CONTIGUOUS(*node) ? "contiguous" : "fragmented",
+ node->size, node->start_cluster);
+ filler(buffer, name, NULL, 0);
+ exfat_put_node(&ef, node);
+ }
+ exfat_closedir(&ef, &it);
+ exfat_put_node(&ef, parent);
+ return 0;
+}
+
+static int fuse_exfat_open(const char* path, struct fuse_file_info* fi)
+{
+ struct exfat_node* node;
+ int rc;
+
+ 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;
+ set_node(fi, node);
+ return 0;
+}
+
+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; /* 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)
+{
+ 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;
+}
+
+static int fuse_exfat_write(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;
+}
+
+static int fuse_exfat_unlink(const char* path)
+{
+ struct exfat_node* node;
+ int rc;
+
+ exfat_debug("[%s] %s", __func__, path);
+
+ rc = exfat_lookup(&ef, &node, path);
+ if (rc != 0)
+ return rc;
+
+ rc = exfat_unlink(&ef, node);
+ exfat_put_node(&ef, node);
+ 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("[%s] %s", __func__, path);
+
+ rc = exfat_lookup(&ef, &node, path);
+ if (rc != 0)
+ return rc;
+
+ rc = exfat_rmdir(&ef, node);
+ exfat_put_node(&ef, node);
+ 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("[%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("[%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("[%s] %s => %s", __func__, old_path, new_path);
+ return exfat_rename(&ef, old_path, new_path);
+}
+
+static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
+{
+ struct exfat_node* node;
+ int rc;
+
+ 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)
+{
+ exfat_debug("[%s]", __func__);
+
+ sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
+ sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
+ 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;
+
+ /*
+ Below are fake values because in exFAT there is
+ a) no simple way to count files;
+ b) no such thing as inode;
+ So here we assume that inode = cluster.
+ */
+ 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 [-d] [-o options] [-V] <device> <dir>\n", prog);
+ exit(1);
+}
+
+static struct fuse_operations fuse_exfat_ops =
+{
+ .getattr = fuse_exfat_getattr,
+ .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,
+ .rmdir = fuse_exfat_rmdir,
+ .mknod = fuse_exfat_mknod,
+ .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 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)
+{
+ options = add_option(options, "fsname", spec);
+ 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;
+ char* mount_options;
+ int debug = 0;
+ struct fuse_chan* fc = NULL;
+ struct fuse* fh = NULL;
+ int opt;
+
+ printf("FUSE exfat %s\n", VERSION);
+
+ mount_options = strdup(default_options);
+ if (mount_options == NULL)
+ {
+ exfat_error("failed to allocate options string");
+ return 1;
+ }
+
+ while ((opt = getopt(argc, argv, "dno:Vv")) != -1)
+ {
+ switch (opt)
+ {
+ case 'd':
+ debug = 1;
+ 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) 2010-2015 Andrew Nayenko");
+ return 0;
+ case 'v':
+ break;
+ default:
+ free(mount_options);
+ usage(argv[0]);
+ break;
+ }
+ }
+ 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;
+ }
+
+ 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)
+ {
+ 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;
+ }
+
+ /* 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;
+}
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