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listfs-tool.c
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listfs-tool.c
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/*
This file is part of liblistfs.
Copyright (C) 2014 kiv <[email protected]>
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
(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, see <http://www.gnu.org/licenses/>
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <time.h>
#ifndef DISABLE_FUSE
#define FUSE_USE_VERSION 30
#include <fuse.h>
#include <sys/statvfs.h>
#endif
#include "liblistfs.h"
FILE *log_file;
FILE *device_file;
ListFS *fs;
#ifndef DISABLE_FUSE
static int _getattr(const char *path, struct stat *stbuf) {
if (strcmp(path, "/") == 0) {
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 2;
return 0;
}
ListFS_BlockIndex node = listfs_search_node(fs, (char*)path + 1, fs->header->root_dir);
if (node == -1) {
return -ENOENT;
}
ListFS_NodeHeader *header = listfs_fetch_node(fs, node);
stbuf->st_nlink = 1;
if (header->flags & LISTFS_NODE_FLAG_DIRECTORY) {
stbuf->st_mode = S_IFDIR | 0755;
} else {
stbuf->st_mode = S_IFREG | 0755;
}
stbuf->st_ctime = header->create_time;
stbuf->st_mtime = header->modify_time;
stbuf->st_atime = header->access_time;
stbuf->st_size = header->size;
free(header);
return 0;
}
typedef struct {
fuse_fill_dir_t filler;
void *buf;
} ReadDirState;
bool readdir_callback(ListFS *fs, ListFS_BlockIndex node, ListFS_NodeHeader *header, void *data) {
ReadDirState *state = data;
state->filler(state->buf, header->name, NULL, 0);
return true;
}
static int _readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi) {
ListFS_BlockIndex node;
if (strcmp(path, "/") == 0) {
node = fs->header->root_dir;
} else {
node = listfs_search_node(fs, (char*)path + 1, fs->header->root_dir);
if (node == -1) {
return -ENOENT;
}
ListFS_NodeHeader *header = listfs_fetch_node(fs, node);
node = (header->flags & LISTFS_NODE_FLAG_DIRECTORY) ? header->data : -1;
free(header);
if (node == -1) {
return -ENOENT;
}
}
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
ReadDirState state;
state.filler = filler;
state.buf = buf;
listfs_foreach_node(fs, node, readdir_callback, &state);
return 0;
}
int _make_node(const char *path, uint32_t flags) {
char *_path = strdup(path);
char *parent_name = strdup(dirname(_path));
free(_path);
const char *file_name = path + strlen(parent_name);
if (file_name[0] == '/') file_name++;
ListFS_BlockIndex parent;
if (strcmp(parent_name, "/") == 0) {
parent = -1;
} else {
parent = listfs_search_node(fs, parent_name + 1, fs->header->root_dir);
if (parent == -1) {
free(parent_name);
return -ENOENT;
}
}
free(parent_name);
return (listfs_create_node(fs, (char*)file_name, flags, parent) ? 0 : -EACCES);
}
static int _mknod(const char *path, mode_t mode, dev_t rdev) {
return _make_node(path, 0);
}
static int _mkdir(const char *path, mode_t mode) {
return _make_node(path, LISTFS_NODE_FLAG_DIRECTORY);
}
static int _unlink(const char *path) {
ListFS_BlockIndex node = listfs_search_node(fs, (char*)path + 1, fs->header->root_dir);
if (node == -1) return -ENOENT;
ListFS_OpennedFile *file = listfs_open_file(fs, node);
if (file) {
listfs_file_seek(file, 0, false);
listfs_file_truncate(file);
listfs_file_close(file);
}
if (listfs_delete_node(fs, node)) {
return 0;
} else {
return -EACCES;
}
}
static int _rmdir(const char *path) {
ListFS_BlockIndex node = listfs_search_node(fs, (char*)path + 1, fs->header->root_dir);
if (node == -1) return -ENOENT;
if (listfs_delete_node(fs, node)) {
return 0;
} else {
return -EACCES;
}
}
static int _rename(const char *from, const char *to) {
ListFS_BlockIndex node = listfs_search_node(fs, (char*)from + 1, fs->header->root_dir);
if (node == -1) return -ENOENT;
char *_path = strdup(to);
char *parent_name = strdup(dirname(_path));
free(_path);
const char *file_name = to + strlen(parent_name);
if (file_name[0] == '/') file_name++;
ListFS_BlockIndex parent;
if (strcmp(parent_name, "/") == 0) {
parent = -1;
} else {
parent = listfs_search_node(fs, parent_name + 1, fs->header->root_dir);
if (parent == -1) {
free(parent_name);
return -ENOENT;
}
}
free(parent_name);
listfs_move_node(fs, node, parent);
listfs_rename_node(fs, node, (char*)file_name);
return 0;
}
static int _open(const char *path, struct fuse_file_info *fi) {
ListFS_OpennedFile *file = listfs_open_file(fs, listfs_search_node(fs, (char*)path + 1, fs->header->root_dir));
if (!file) {
return -ENOENT;
}
fi->fh = (size_t)file;
return 0;
}
static int _release(const char *path, struct fuse_file_info *fi) {
listfs_file_close((void*)fi->fh);
return 0;
}
static int _read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) {
ListFS_OpennedFile *file = (void*)fi->fh;
listfs_file_seek(file, offset, false);
return listfs_file_read(file, buf, size);
}
static int _write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi) {
ListFS_OpennedFile *file = (void*)fi->fh;
listfs_file_seek(file, offset, true);
return listfs_file_write(file, (char*)buf, size);
}
static int _truncate(const char *path, off_t size) {
ListFS_OpennedFile *file = listfs_open_file(fs, listfs_search_node(fs, (char*)path + 1, fs->header->root_dir));
if (!file) {
return -ENOENT;
}
listfs_file_seek(file, size, true);
listfs_file_truncate(file);
listfs_file_close(file);
return 0;
}
void _destroy() {
listfs_close(fs);
}
static int _statfs(const char *path, struct statvfs *stbuf) {
stbuf->f_bsize = fs->header->block_size;
stbuf->f_frsize = fs->header->block_size;
stbuf->f_blocks = fs->header->size;
stbuf->f_bfree = fs->header->size - fs->header->used_blocks;
stbuf->f_bavail = stbuf->f_bfree;
stbuf->f_namemax = 255;
return 0;
}
static struct fuse_operations listfs_operations = {
.getattr = _getattr,
.readdir = _readdir,
.mknod = _mknod,
.mkdir = _mkdir,
.unlink = _unlink,
.rmdir = _rmdir,
.rename = _rename,
.open = _open,
.release = _release,
.read = _read,
.write = _write,
.truncate = _truncate,
.destroy = _destroy,
.statfs = _statfs
};
#endif
void display_usage() {
printf("ListFS Tool. Version %i.%i\n", LISTFS_VERSION_MAJOR, LISTFS_VERSION_MINOR);
printf("Usage:\n");
printf("\tlistfs-tool create <file or device name> <file system size in blocks>\n\t\t<block size> [bootloader file name]\n");
printf("\tlistfs-tool dump <file or device name>\n");
#ifndef DISABLE_FUSE
printf("\tlistfs-tool mount <file or device name> <mount point> [fuse options]\n");
#endif
printf("\n");
}
void read_block_func(ListFS *fs, ListFS_BlockIndex index, void *buffer) {
fseek(device_file, index * fs->header->block_size + fs->header->base, SEEK_SET);
fread(buffer, fs->header->block_size, 1, device_file);
}
void write_block_func(ListFS *fs, ListFS_BlockIndex index, void *buffer) {
fseek(device_file, index * fs->header->block_size + fs->header->base, SEEK_SET);
fwrite(buffer, fs->header->block_size, 1, device_file);
}
void log_func(ListFS *fs, char *fmt, va_list ap) {
vfprintf(log_file, fmt, ap);
}
char readme_text[] = "This is first file on your ListFS!\n";
void dump_block_list(ListFS_BlockIndex list_block, char *ident) {
if (list_block != -1) {
ListFS_BlockIndex *list = malloc(fs->header->block_size);
size_t block_list_size = fs->header->block_size / sizeof(ListFS_BlockIndex);
read_block_func(fs, list_block, list);
printf("%s\tBlock list %lli (next = %lli, prev = %lli):\n", ident, list_block, list[block_list_size - 1], list[0]);
size_t i;
for (i = 1; i < block_list_size - 1; i++) {
if (list[i] == -1) break;
printf("%s\t\tBlock %llu\n", ident, list[i]);
}
if (list[block_list_size - 1] != -1) {
dump_block_list(list[block_list_size - 1], ident);
}
free(list);
}
}
bool dump_node_callback(ListFS *fs, ListFS_BlockIndex node, ListFS_NodeHeader *header, void *data) {
char *ident = data;
printf("%sNode %llu (name = '%s', flags = %u, size = %llu, data = %lli)\n", ident, node, header->name, header->flags,
header->size, header->data);
if (header->flags & LISTFS_NODE_FLAG_DIRECTORY) {
char new_ident[strlen(ident) + 2];
strcpy(new_ident, ident);
new_ident[strlen(ident)] = '\t';
new_ident[strlen(ident) + 1] = 0;
listfs_foreach_node(fs, header->data, dump_node_callback, new_ident);
} else {
dump_block_list(header->data, ident);
}
return true;
}
int main(int argc, char *argv[]) {
if (argc < 3) {
display_usage();
return 0;
}
log_file = fopen("/tmp/listfs-tool.log", "w");
fs = listfs_init(read_block_func, write_block_func, log_func);
char *action = argv[1];
char *file_name = argv[2];
if (strcmp(action, "create") == 0) {
if (argc < 5) {
display_usage();
return 0;
}
ListFS_BlockCount fs_size = atol(argv[3]);
int fs_block_size = atoi(argv[4]);
if (fs_size < 2) {
printf("FS size too small!\n");
return -1;
}
if (fs_block_size < LISTFS_MIN_BLOCK_SIZE) {
printf("Block size must be greater than %u bytes!\n", LISTFS_MIN_BLOCK_SIZE);
return -1;
}
uint8_t *bootloader = NULL;
size_t bootloader_size = 0;
if (argc >= 6) {
char *bootloader_file_name = argv[5];
FILE *bootloader_file = fopen(bootloader_file_name, "r");
if (!bootloader_file) {
printf("Failed to open '%s'!\n", bootloader_file_name);
return -2;
}
while (feof(bootloader_file) == 0) {
size_t offset = bootloader_size;
bootloader_size += LISTFS_MIN_BLOCK_SIZE;
bootloader = realloc(bootloader, bootloader_size);
if (fread(bootloader + offset, LISTFS_MIN_BLOCK_SIZE, 1, bootloader_file) == 0) {
bootloader_size = offset;
break;
}
}
fclose(bootloader_file);
}
device_file = fopen(file_name, "w+");
listfs_create(fs, fs_size, fs_block_size, bootloader, bootloader_size);
ListFS_OpennedFile *file = listfs_open_file(fs, listfs_create_node(fs, "README", 0, -1));
listfs_file_write(file, readme_text, strlen(readme_text));
listfs_file_close(file);
listfs_close(fs);
free(bootloader);
return 0;
#ifndef DISABLE_FUSE
} else if (strcmp(action, "mount") == 0) {
if (argc < 4) {
display_usage();
return 0;
}
device_file = fopen(file_name, "r+");
if (!listfs_open(fs)) {
fprintf(stderr, "Failed to open ListFS volume! Maybe this is not ListFS?\n");
}
int i;
for (i = 3; i < argc; i++) {
argv[i - 2] = argv[i];
}
return fuse_main(argc - 2, argv, &listfs_operations, NULL);
#endif
} else if (strcmp(action, "dump") == 0) {
device_file = fopen(file_name, "r+");
if (!listfs_open(fs)) {
fprintf(stderr, "Failed to open ListFS volume! Maybe this is not ListFS?\n");
}
printf("ListFS information:\n\tVersion: %i.%i\n\tBase: %llu\n\tSize: %llu\n\tBitmap base: %llu\n\tBitmap size: %llu\n"
"\tBlock size: %u\n\tUsed blocks count: %llu\n",
fs->header->version >> 8, fs->header->version & 0xFF, fs->header->base, fs->header->size,
fs->header->map_base, fs->header->map_size, fs->header->block_size, fs->header->used_blocks);
printf("Nodes:\n");
listfs_foreach_node(fs, fs->header->root_dir, dump_node_callback, "\t");
listfs_close(fs);
} else {
printf("Unknown action: %s!\n", action);
return -10;
}
}