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615 lines
14 KiB
615 lines
14 KiB
/*
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main.c (01.09.09)
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FUSE-based exFAT implementation. Requires FUSE 2.6 or later.
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Free exFAT implementation.
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Copyright (C) 2010-2018 Andrew Nayenko
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <exfat.h>
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#define FUSE_USE_VERSION 26
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#include <fuse.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <unistd.h>
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#ifndef DEBUG
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#define exfat_debug(format, ...)
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#endif
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#if !defined(FUSE_VERSION) || (FUSE_VERSION < 26)
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#error FUSE 2.6 or later is required
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#endif
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struct exfat ef;
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static struct exfat_node* get_node(const struct fuse_file_info* fi)
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{
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return (struct exfat_node*) (size_t) fi->fh;
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}
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static void set_node(struct fuse_file_info* fi, struct exfat_node* node)
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{
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fi->fh = (uint64_t) (size_t) node;
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fi->keep_cache = 1;
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}
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static int fuse_exfat_getattr(const char* path, struct stat* stbuf)
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{
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struct exfat_node* node;
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int rc;
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exfat_debug("[%s] %s", __func__, path);
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rc = exfat_lookup(&ef, &node, path);
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if (rc != 0)
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return rc;
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exfat_stat(&ef, node, stbuf);
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exfat_put_node(&ef, node);
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return 0;
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}
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static int fuse_exfat_truncate(const char* path, off_t size)
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{
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struct exfat_node* node;
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int rc;
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exfat_debug("[%s] %s, %"PRId64, __func__, path, size);
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rc = exfat_lookup(&ef, &node, path);
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if (rc != 0)
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return rc;
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rc = exfat_truncate(&ef, node, size, true);
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if (rc != 0)
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{
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exfat_flush_node(&ef, node); /* ignore return code */
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exfat_put_node(&ef, node);
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return rc;
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}
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rc = exfat_flush_node(&ef, node);
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exfat_put_node(&ef, node);
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return rc;
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}
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static int fuse_exfat_readdir(const char* path, void* buffer,
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fuse_fill_dir_t filler, UNUSED off_t offset,
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UNUSED struct fuse_file_info* fi)
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{
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struct exfat_node* parent;
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struct exfat_node* node;
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struct exfat_iterator it;
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int rc;
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char name[EXFAT_UTF8_NAME_BUFFER_MAX];
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struct stat stbuf;
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exfat_debug("[%s] %s", __func__, path);
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rc = exfat_lookup(&ef, &parent, path);
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if (rc != 0)
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return rc;
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if (!(parent->attrib & EXFAT_ATTRIB_DIR))
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{
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exfat_put_node(&ef, parent);
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exfat_error("'%s' is not a directory (%#hx)", path, parent->attrib);
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return -ENOTDIR;
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}
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filler(buffer, ".", NULL, 0);
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filler(buffer, "..", NULL, 0);
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rc = exfat_opendir(&ef, parent, &it);
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if (rc != 0)
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{
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exfat_put_node(&ef, parent);
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exfat_error("failed to open directory '%s'", path);
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return rc;
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}
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while ((node = exfat_readdir(&it)))
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{
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exfat_get_name(node, name);
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exfat_debug("[%s] %s: %s, %"PRId64" bytes, cluster 0x%x", __func__,
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name, node->is_contiguous ? "contiguous" : "fragmented",
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node->size, node->start_cluster);
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exfat_stat(&ef, node, &stbuf);
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filler(buffer, name, &stbuf, 0);
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exfat_put_node(&ef, node);
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}
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exfat_closedir(&ef, &it);
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exfat_put_node(&ef, parent);
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return 0;
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}
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static int fuse_exfat_open(const char* path, struct fuse_file_info* fi)
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{
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struct exfat_node* node;
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int rc;
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exfat_debug("[%s] %s", __func__, path);
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rc = exfat_lookup(&ef, &node, path);
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if (rc != 0)
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return rc;
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set_node(fi, node);
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return 0;
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}
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static int fuse_exfat_create(const char* path, UNUSED mode_t mode,
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struct fuse_file_info* fi)
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{
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struct exfat_node* node;
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int rc;
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exfat_debug("[%s] %s 0%ho", __func__, path, mode);
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rc = exfat_mknod(&ef, path);
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if (rc != 0)
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return rc;
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rc = exfat_lookup(&ef, &node, path);
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if (rc != 0)
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return rc;
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set_node(fi, node);
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return 0;
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}
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static int fuse_exfat_release(UNUSED const char* path,
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struct fuse_file_info* fi)
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{
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/*
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This handler is called by FUSE on close() syscall. If the FUSE
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implementation does not call flush handler, we will flush node here.
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But in this case we will not be able to return an error to the caller.
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See fuse_exfat_flush() below.
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*/
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exfat_debug("[%s] %s", __func__, path);
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exfat_flush_node(&ef, get_node(fi));
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exfat_put_node(&ef, get_node(fi));
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return 0; /* FUSE ignores this return value */
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}
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static int fuse_exfat_flush(UNUSED const char* path, struct fuse_file_info* fi)
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{
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/*
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This handler may be called by FUSE on close() syscall. FUSE also deals
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with removals of open files, so we don't free clusters on close but
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only on rmdir and unlink. If the FUSE implementation does not call this
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handler we will flush node on release. See fuse_exfat_relase() above.
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*/
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exfat_debug("[%s] %s", __func__, path);
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return exfat_flush_node(&ef, get_node(fi));
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}
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static int fuse_exfat_fsync(UNUSED const char* path, UNUSED int datasync,
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UNUSED struct fuse_file_info *fi)
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{
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int rc;
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exfat_debug("[%s] %s", __func__, path);
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rc = exfat_flush_nodes(&ef);
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if (rc != 0)
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return rc;
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rc = exfat_flush(&ef);
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if (rc != 0)
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return rc;
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return exfat_fsync(ef.dev);
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}
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static int fuse_exfat_read(UNUSED const char* path, char* buffer,
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size_t size, off_t offset, struct fuse_file_info* fi)
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{
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exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
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return exfat_generic_pread(&ef, get_node(fi), buffer, size, offset);
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}
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static int fuse_exfat_write(UNUSED const char* path, const char* buffer,
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size_t size, off_t offset, struct fuse_file_info* fi)
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{
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exfat_debug("[%s] %s (%zu bytes)", __func__, path, size);
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return exfat_generic_pwrite(&ef, get_node(fi), buffer, size, offset);
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}
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static int fuse_exfat_unlink(const char* path)
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{
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struct exfat_node* node;
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int rc;
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exfat_debug("[%s] %s", __func__, path);
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rc = exfat_lookup(&ef, &node, path);
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if (rc != 0)
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return rc;
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rc = exfat_unlink(&ef, node);
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exfat_put_node(&ef, node);
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if (rc != 0)
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return rc;
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return exfat_cleanup_node(&ef, node);
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}
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static int fuse_exfat_rmdir(const char* path)
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{
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struct exfat_node* node;
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int rc;
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exfat_debug("[%s] %s", __func__, path);
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rc = exfat_lookup(&ef, &node, path);
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if (rc != 0)
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return rc;
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rc = exfat_rmdir(&ef, node);
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exfat_put_node(&ef, node);
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if (rc != 0)
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return rc;
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return exfat_cleanup_node(&ef, node);
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}
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static int fuse_exfat_mknod(const char* path, UNUSED mode_t mode,
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UNUSED dev_t dev)
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{
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exfat_debug("[%s] %s 0%ho", __func__, path, mode);
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return exfat_mknod(&ef, path);
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}
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static int fuse_exfat_mkdir(const char* path, UNUSED mode_t mode)
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{
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exfat_debug("[%s] %s 0%ho", __func__, path, mode);
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return exfat_mkdir(&ef, path);
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}
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static int fuse_exfat_rename(const char* old_path, const char* new_path)
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{
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exfat_debug("[%s] %s => %s", __func__, old_path, new_path);
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return exfat_rename(&ef, old_path, new_path);
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}
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static int fuse_exfat_utimens(const char* path, const struct timespec tv[2])
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{
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struct exfat_node* node;
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int rc;
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exfat_debug("[%s] %s", __func__, path);
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rc = exfat_lookup(&ef, &node, path);
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if (rc != 0)
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return rc;
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exfat_utimes(node, tv);
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rc = exfat_flush_node(&ef, node);
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exfat_put_node(&ef, node);
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return rc;
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}
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static int fuse_exfat_chmod(UNUSED const char* path, mode_t mode)
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{
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const mode_t VALID_MODE_MASK = S_IFREG | S_IFDIR |
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S_IRWXU | S_IRWXG | S_IRWXO;
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exfat_debug("[%s] %s 0%ho", __func__, path, mode);
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if (mode & ~VALID_MODE_MASK)
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return -EPERM;
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return 0;
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}
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static int fuse_exfat_chown(UNUSED const char* path, uid_t uid, gid_t gid)
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{
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exfat_debug("[%s] %s %u:%u", __func__, path, uid, gid);
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if (uid != ef.uid || gid != ef.gid)
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return -EPERM;
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return 0;
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}
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static int fuse_exfat_statfs(UNUSED const char* path, struct statvfs* sfs)
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{
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exfat_debug("[%s]", __func__);
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sfs->f_bsize = CLUSTER_SIZE(*ef.sb);
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sfs->f_frsize = CLUSTER_SIZE(*ef.sb);
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sfs->f_blocks = le64_to_cpu(ef.sb->sector_count) >> ef.sb->spc_bits;
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sfs->f_bavail = exfat_count_free_clusters(&ef);
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sfs->f_bfree = sfs->f_bavail;
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sfs->f_namemax = EXFAT_NAME_MAX;
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/*
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Below are fake values because in exFAT there is
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a) no simple way to count files;
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b) no such thing as inode;
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So here we assume that inode = cluster.
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*/
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sfs->f_files = le32_to_cpu(ef.sb->cluster_count);
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sfs->f_favail = sfs->f_bfree >> ef.sb->spc_bits;
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sfs->f_ffree = sfs->f_bavail;
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return 0;
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}
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static void* fuse_exfat_init(struct fuse_conn_info* fci)
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{
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exfat_debug("[%s]", __func__);
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#ifdef FUSE_CAP_BIG_WRITES
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fci->want |= FUSE_CAP_BIG_WRITES;
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#endif
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/* mark super block as dirty; failure isn't a big deal */
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exfat_soil_super_block(&ef);
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return NULL;
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}
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static void fuse_exfat_destroy(UNUSED void* unused)
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{
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exfat_debug("[%s]", __func__);
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exfat_unmount(&ef);
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}
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static void usage(const char* prog)
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{
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fprintf(stderr, "Usage: %s [-d] [-o options] [-V] <device> <dir>\n", prog);
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exit(1);
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}
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static struct fuse_operations fuse_exfat_ops =
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{
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.getattr = fuse_exfat_getattr,
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.truncate = fuse_exfat_truncate,
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.readdir = fuse_exfat_readdir,
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.open = fuse_exfat_open,
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.create = fuse_exfat_create,
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.release = fuse_exfat_release,
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.flush = fuse_exfat_flush,
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.fsync = fuse_exfat_fsync,
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.fsyncdir = fuse_exfat_fsync,
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.read = fuse_exfat_read,
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.write = fuse_exfat_write,
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.unlink = fuse_exfat_unlink,
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.rmdir = fuse_exfat_rmdir,
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.mknod = fuse_exfat_mknod,
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.mkdir = fuse_exfat_mkdir,
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.rename = fuse_exfat_rename,
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.utimens = fuse_exfat_utimens,
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.chmod = fuse_exfat_chmod,
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.chown = fuse_exfat_chown,
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.statfs = fuse_exfat_statfs,
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.init = fuse_exfat_init,
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.destroy = fuse_exfat_destroy,
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};
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static char* add_option(char* options, const char* name, const char* value)
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{
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size_t size;
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char* optionsf = options;
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if (value)
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size = strlen(options) + strlen(name) + strlen(value) + 3;
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else
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size = strlen(options) + strlen(name) + 2;
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options = realloc(options, size);
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if (options == NULL)
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{
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free(optionsf);
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exfat_error("failed to reallocate options string");
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return NULL;
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}
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strcat(options, ",");
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strcat(options, name);
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if (value)
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{
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strcat(options, "=");
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strcat(options, value);
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}
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return options;
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}
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static void escape(char* escaped, const char* orig)
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{
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do
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{
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if (*orig == ',' || *orig == '\\')
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*escaped++ = '\\';
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}
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while ((*escaped++ = *orig++));
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}
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static char* add_fsname_option(char* options, const char* spec)
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{
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/* escaped string cannot be more than twice as big as the original one */
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char* escaped = malloc(strlen(spec) * 2 + 1);
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if (escaped == NULL)
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{
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free(options);
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exfat_error("failed to allocate escaped string for %s", spec);
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return NULL;
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}
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/* on some platforms (e.g. Android, Solaris) device names can contain
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commas */
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escape(escaped, spec);
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options = add_option(options, "fsname", escaped);
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free(escaped);
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return options;
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}
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static char* add_ro_option(char* options, bool ro)
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{
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return ro ? add_option(options, "ro", NULL) : options;
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}
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#if defined(__linux__) || defined(__FreeBSD__)
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static char* add_user_option(char* options)
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{
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struct passwd* pw;
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if (getuid() == 0)
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return options;
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pw = getpwuid(getuid());
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if (pw == NULL || pw->pw_name == NULL)
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{
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free(options);
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exfat_error("failed to determine username");
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return NULL;
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}
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return add_option(options, "user", pw->pw_name);
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}
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#endif
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#if defined(__linux__)
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static char* add_blksize_option(char* options, long cluster_size)
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{
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long page_size = sysconf(_SC_PAGESIZE);
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char blksize[20];
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if (page_size < 1)
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page_size = 0x1000;
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snprintf(blksize, sizeof(blksize), "%ld", MIN(page_size, cluster_size));
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return add_option(options, "blksize", blksize);
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}
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#endif
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static char* add_fuse_options(char* options, const char* spec, bool ro)
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{
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options = add_fsname_option(options, spec);
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if (options == NULL)
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return NULL;
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options = add_ro_option(options, ro);
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if (options == NULL)
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return NULL;
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#if defined(__linux__) || defined(__FreeBSD__)
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options = add_user_option(options);
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if (options == NULL)
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return NULL;
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#endif
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#if defined(__linux__)
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options = add_blksize_option(options, CLUSTER_SIZE(*ef.sb));
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if (options == NULL)
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return NULL;
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#endif
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return options;
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}
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static int fuse_exfat_main(char* mount_options, char* mount_point)
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{
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char* argv[] = {"exfat", "-s", "-o", mount_options, mount_point, NULL};
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return fuse_main(sizeof(argv) / sizeof(argv[0]) - 1, argv,
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&fuse_exfat_ops, NULL);
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}
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int main(int argc, char* argv[])
|
|
{
|
|
const char* spec = NULL;
|
|
char* mount_point = NULL;
|
|
char* fuse_options;
|
|
char* exfat_options;
|
|
int opt;
|
|
int rc;
|
|
|
|
printf("FUSE exfat %s\n", VERSION);
|
|
|
|
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)
|
|
{
|
|
exfat_error("failed to allocate options string");
|
|
return 1;
|
|
}
|
|
|
|
while ((opt = getopt(argc, argv, "dno:Vv")) != -1)
|
|
{
|
|
switch (opt)
|
|
{
|
|
case 'd':
|
|
fuse_options = add_option(fuse_options, "debug", NULL);
|
|
if (fuse_options == NULL)
|
|
{
|
|
free(exfat_options);
|
|
return 1;
|
|
}
|
|
break;
|
|
case 'n':
|
|
break;
|
|
case 'o':
|
|
exfat_options = add_option(exfat_options, optarg, NULL);
|
|
if (exfat_options == NULL)
|
|
{
|
|
free(fuse_options);
|
|
return 1;
|
|
}
|
|
break;
|
|
case 'V':
|
|
free(exfat_options);
|
|
free(fuse_options);
|
|
puts("Copyright (C) 2010-2018 Andrew Nayenko");
|
|
return 0;
|
|
case 'v':
|
|
break;
|
|
default:
|
|
free(exfat_options);
|
|
free(fuse_options);
|
|
usage(argv[0]);
|
|
break;
|
|
}
|
|
}
|
|
if (argc - optind != 2)
|
|
{
|
|
free(exfat_options);
|
|
free(fuse_options);
|
|
usage(argv[0]);
|
|
}
|
|
spec = argv[optind];
|
|
mount_point = argv[optind + 1];
|
|
|
|
if (exfat_mount(&ef, spec, exfat_options) != 0)
|
|
{
|
|
free(exfat_options);
|
|
free(fuse_options);
|
|
return 1;
|
|
}
|
|
|
|
free(exfat_options);
|
|
|
|
fuse_options = add_fuse_options(fuse_options, spec, ef.ro != 0);
|
|
if (fuse_options == NULL)
|
|
{
|
|
exfat_unmount(&ef);
|
|
return 1;
|
|
}
|
|
|
|
/* let FUSE do all its wizardry */
|
|
rc = fuse_exfat_main(fuse_options, mount_point);
|
|
|
|
free(fuse_options);
|
|
return rc;
|
|
}
|