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Diffstat (limited to '')
| -rw-r--r-- | exfat/exfat-fuse/main.c | 564 |
1 files changed, 564 insertions, 0 deletions
diff --git a/exfat/exfat-fuse/main.c b/exfat/exfat-fuse/main.c new file mode 100644 index 000000000..abb60e7df --- /dev/null +++ b/exfat/exfat-fuse/main.c @@ -0,0 +1,564 @@ +/* + main.c (01.09.09) + FUSE-based exFAT implementation. Requires FUSE 2.6 or later. + + Free exFAT implementation. + Copyright (C) 2010-2013 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. +*/ + +#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, ...) + +#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," + "defer_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; +} + +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, off64_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); + exfat_put_node(&ef, node); + return rc; +} + +static int fuse_exfat_readdir(const char* path, void* buffer, + fuse_fill_dir_t filler, off64_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); + fi->keep_cache = 1; + return 0; +} + +static int fuse_exfat_release(const char* path, struct fuse_file_info* fi) +{ + exfat_debug("[%s] %s", __func__, path); + exfat_put_node(&ef, get_node(fi)); + return 0; +} + +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_node(&ef, get_node(fi)); + 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, + off64_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, + off64_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); + return rc; +} + +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); + return rc; +} + +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); + exfat_put_node(&ef, node); + return 0; +} + +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 = (sfs->f_blocks - sfs->f_bfree) >> ef.sb->spc_bits; + 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, + .release = fuse_exfat_release, + .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; + + if (value) + size = strlen(options) + strlen(name) + strlen(value) + 3; + else + size = strlen(options) + strlen(name) + 2; + + options = realloc(options, size); + if (options == NULL) + { + 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 %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; + } + + 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) 2010-2013 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; +} |