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main.c
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main.c
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#define _FILE_OFFSET_BITS 64
#define MEMCACHED_DEFAULT_COMMAND_SIZE 350
#define FUSE_USE_VERSION 30
#include <fuse.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <libmemcached/memcached.h>
typedef struct{
char *host;
char *port;
short verbose;
unsigned int maxhandle;
}memcachefs_opt_t;
/* default options */
memcachefs_opt_t opt = {
.host = NULL,
.port = "11211",
.verbose = 0,
.maxhandle = 10,
};
// Memcached
memcached_server_st *servers = NULL;
memcached_st *memc;
memcached_return rc;
uint32_t flags;
void *auxbuf;
// TODO: this could be a structure
long int memcached_bytes_used;
static memcached_return_t get_stat(const memcached_instance_st *memc,
const char *key, size_t key_length,
const char *value, size_t value_length, void *context) {
struct statvfs *stbuf = context;
if(opt.verbose){
fprintf(stderr, "%s = %s\n", key, value);
}
if (strcmp(key, "limit_maxbytes") == 0){
stbuf->f_blocks = atol(value);
}
if (strcmp(key, "curr_items") == 0){
stbuf->f_files = atol(value);
}
if (strcmp(key, "bytes") == 0){
memcached_bytes_used = atol(value);
}
return MEMCACHED_SUCCESS;
}
static int memcachedfs_statfs(const char *path, struct statvfs *stbuf){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
stbuf->f_bsize = 1; /* Optimal transfer block size */
stbuf->f_blocks = 1; /* Total data blocks in filesystem */
stbuf->f_bfree = 1; /* Free blocks in filesystem */
stbuf->f_bavail = 1; /* Free blocks available to unprivileged user */
stbuf->f_files = 1; /* Total inodes in filesystem */
stbuf->f_ffree = 1; /* Free inodes in filesystem */
stbuf->f_namemax = 250; /* maximum lenght of filenames */
rc = memcached_stat_execute(memc, NULL, get_stat, stbuf);
stbuf->f_bfree = stbuf->f_bavail = stbuf->f_blocks - memcached_bytes_used;
return 0;
}
static memcached_return_t process2(const memcached_st *memc, const char *k, size_t l, void *ctx) {
fuse_fill_dir_t (*f) = ctx;
(*f)(auxbuf, k, NULL, 0);
return MEMCACHED_SUCCESS;
}
static int memcachedfs_getattr(const char *path, struct stat *stbuf){
char *key;
size_t keylen;
void *val;
size_t vallen;
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
memset(stbuf, 0, sizeof(struct stat));
stbuf->st_uid = fuse_get_context()->uid;
stbuf->st_gid = fuse_get_context()->gid;
stbuf->st_atime = time(NULL);
stbuf->st_mtime = time(NULL);
if(!strcmp(path, "/")){
stbuf->st_ino = 1;
stbuf->st_mode = S_IFDIR | 0777;
stbuf->st_nlink = 2;
}
else{
key = (char *)path + 1;
keylen = strlen(key);
val = memcached_get(memc, key, keylen, &vallen, &flags, &rc);
if (rc == MEMCACHED_SUCCESS) {
stbuf->st_mode = S_IFREG | 0666;
stbuf->st_nlink = 1;
stbuf->st_size = vallen;
free(val);
}
else{
return -ENOENT;
}
}
return 0;
}
static int memcachedfs_opendir(const char *path, struct fuse_file_info *fi){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
return 0;
}
static int memcachedfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
if(strcmp(path, "/") == 0){
memcached_dump_fn cb[1] = {&process2};
auxbuf = buf;
rc = memcached_dump(memc, cb, &filler, 1);
}
return 0;
}
static int memcachedfs_releasedir(const char *path, struct fuse_file_info *fi){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
return 0;
}
static int memcachedfs_mknod(const char *path, mode_t mode, dev_t rdev){
int ret;
char *key;
size_t keylen;
if(opt.verbose){
fprintf(stderr, "%s(\"%s\", 0%o)\n", __func__, path, mode);
}
if(!S_ISREG(mode)){
return -ENOSYS;
}
key = (char *)path + 1;
keylen = strlen(key);
rc = memcached_set(memc, key, keylen, "", 0, (time_t)0, (uint32_t)0);
if (rc == MEMCACHED_SUCCESS){
return 0;
}
else{
fprintf(stderr, "Couldn't store key: %s\n", memcached_strerror(memc, rc));
}
return -EIO;
}
static int memcachedfs_mkdir(const char *path, mode_t mode){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\", 0%o)\n", __func__, path, mode);
}
return -ENOSYS;
}
static int memcachedfs_unlink(const char *path){
int ret;
char *key;
size_t keylen;
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
key = (char *)path + 1;
keylen = strlen(key);
rc = memcached_delete(memc, key, keylen, 0);
if (rc != MEMCACHED_SUCCESS) {
fprintf(stderr, "Couldn't delete key: %s\n", memcached_strerror(memc, rc));
return -EIO;
}
return 0;
}
static int memcachedfs_chmod(const char* path, mode_t mode){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\", 0%3o)\n", __func__, path, mode);
}
return -ENOSYS;
}
static int memcachedfs_chown(const char *path, uid_t uid, gid_t gid){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\", %d, %d)\n", __func__, path, uid, gid);
}
return -ENOSYS;
}
static int memcachedfs_truncate(const char* path, off_t length){
char *key;
size_t keylen;
if(opt.verbose){
fprintf(stderr, "%s(\"%s\", %lld)\n", __func__, path, length);
}
if(length != 0){
return -ENOSYS;
}
key = (char *)path + 1;
keylen = strlen(key);
rc = memcached_set(memc, key, keylen, "", 0, (time_t)0, (uint32_t)0);
if (rc != MEMCACHED_SUCCESS) {
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));
return -EIO;
}
return 0;
}
static int memcachedfs_utime(const char *path, struct utimbuf *time){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
return 0;
}
static int memcachedfs_open(const char *path, struct fuse_file_info *fi){
char *key;
size_t keylen;
void *value;
size_t vallen;
uint32_t flags;
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
key = (char *)path + 1;
keylen = strlen(key);
value = memcached_get(memc, key, keylen, &keylen, &flags, &rc);
if (rc != MEMCACHED_SUCCESS) {
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));
return -EIO;
}
return 0;
}
static int memcachedfs_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi){
size_t klen;
char *key;
void *value;
size_t vlen;
uint32_t flags;
if(opt.verbose){
fprintf(stderr, "%s(\"%s\" %zu@%llu)\n", __func__, path, size, offset);
}
key = (char *)path + 1;
klen = strlen(key);
value = memcached_get(memc, key, klen, &vlen, &flags, &rc);
if (rc == MEMCACHED_SUCCESS) {
memcpy(buf, value + offset, size - offset); // TODO review size
free(value);
}
else
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));
return vlen - offset;
}
static int memcachedfs_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi){
size_t klen;
char *key;
if(opt.verbose){
fprintf(stderr, "%s(\"%s\" %zu@%lld)\n", __func__, path, size, offset);
}
// TODO: for now it will overwrite everything, needs support for partial writes
key = (char *)path + 1;
klen = strlen(key);
rc = memcached_set(memc, key, klen, buf, size, (time_t)0, (uint32_t)0);
if (rc != MEMCACHED_SUCCESS){
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));
return -EIO;
}
return size;
}
static int memcachedfs_flush(const char *path, struct fuse_file_info *fi){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
return 0;
}
static int memcachedfs_release(const char *path, struct fuse_file_info *fi){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
return 0;
}
static int memcachedfs_fsync(const char *path, int i, struct fuse_file_info *fi){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\", %d)\n", __func__, path, i);
}
return 0;
}
static int memcachedfs_link(const char *from, const char *to){
if(opt.verbose){
fprintf(stderr, "%s(%s, %s)\n", __func__, from, to);
}
return -ENOSYS;
}
static int memcachedfs_symlink(const char *from, const char *to){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\" -> \"%s\")\n", __func__, from, to);
}
return -ENOSYS;
}
static int memcachedfs_readlink(const char *path, char *buf, size_t size){
if(opt.verbose){
fprintf(stderr, "%s(\"%s\")\n", __func__, path);
}
return -ENOSYS;
}
static int memcachedfs_rename(const char *from, const char *to){
int ret;
char *key;
size_t keylen;
void *value;
size_t vallen;
uint32_t flags;
if(opt.verbose){
fprintf(stderr, "%s(%s -> %s)\n", __func__, from, to);
}
key = (char *)from + 1;
keylen = strlen(key);
value = memcached_get(memc, key, keylen, &vallen, &flags, &rc);
if (rc == MEMCACHED_SUCCESS) {
key = (char *)to + 1;
keylen = strlen(key);
rc = memcached_set(memc, key, keylen, value, vallen, (time_t)0, (uint32_t)0);
if (rc != MEMCACHED_SUCCESS){
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));
free(value);
return -EIO;
}
else{
key = (char *)from + 1;
keylen = strlen(key);
rc = memcached_delete(memc, key, keylen, 0);
if (rc != MEMCACHED_SUCCESS) {
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));
free(value);
return -EIO;;
}
}
}
else{
fprintf(stderr, "Couldn't retrieve key: %s\n", memcached_strerror(memc, rc));
return -ENOENT;
}
free(value);
return 0;
}
static struct fuse_operations memcachedfs_oper = {
.getattr = memcachedfs_getattr,
.opendir = memcachedfs_opendir,
.readdir = memcachedfs_readdir,
.releasedir = memcachedfs_releasedir,
.mknod = memcachedfs_mknod,
.mkdir = memcachedfs_mkdir,
.unlink = memcachedfs_unlink,
.rmdir = memcachedfs_unlink,
.chmod = memcachedfs_chmod,
.chown = memcachedfs_chown,
.truncate = memcachedfs_truncate,
.utime = memcachedfs_utime,
.open = memcachedfs_open,
.read = memcachedfs_read,
.write = memcachedfs_write,
.flush = memcachedfs_flush,
.release = memcachedfs_release,
.fsync = memcachedfs_fsync,
.link = memcachedfs_link,
.symlink = memcachedfs_symlink,
.readlink = memcachedfs_readlink,
.rename = memcachedfs_rename,
.statfs = memcachedfs_statfs,
};
void usage(){
fprintf(stderr, "Usage: memcachedfs host[:port] mountpoint\n");
}
static int memcachedfs_opt_proc(void *data, const char *arg, int key, struct fuse_args *outargs){
char *str;
if(key == FUSE_OPT_KEY_OPT){
if(!strcmp(arg, "-v")){
opt.verbose = 1;
}
else if(!strncmp(arg, "maxhandle=", strlen("maxhandle="))){
str = strchr(arg, '=') + 1;
opt.maxhandle = atoi(str);
}
else{
fuse_opt_add_arg(outargs, arg);
}
}else if(key == FUSE_OPT_KEY_NONOPT){
if(!opt.host){
opt.host = (char*)arg;
str = strchr(arg, ':');
if(str){
*str = '\0';
str++;
opt.port = str;
}
}
else{
fuse_opt_add_arg(outargs, arg);
}
}
return 0;
}
/*
* main
*/
int main(int argc, char *argv[]){
struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
fuse_opt_parse(&args, &opt, NULL, memcachedfs_opt_proc);
if(!opt.host){
usage();
return EXIT_SUCCESS;
}
if(opt.verbose){
fprintf(stderr, "mounting to %s:%s\n", opt.host, opt.port);
}
memc = memcached_create(NULL);
servers = memcached_server_list_append(servers, opt.host, atoi(opt.port), &rc);
rc = memcached_server_push(memc, servers);
if (rc == MEMCACHED_SUCCESS){
if(opt.verbose){
fprintf(stderr, "Added server successfully\n");
}
}
else{
if(opt.verbose){
fprintf(stderr, "Couldn't add server: %s\n", memcached_strerror(memc, rc));
}
return EXIT_FAILURE;
}
fuse_main(args.argc, args.argv, &memcachedfs_oper, NULL);
fuse_opt_free_args(&args);
return EXIT_SUCCESS;
}