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fuse.cc
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/*
* receive request from fuse and call methods of yfs_client
*
* started life as low-level example in the fuse distribution. we
* have to use low-level interface in order to get i-numbers. the
* high-level interface only gives us complete paths.
*/
#include <fuse_lowlevel.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <arpa/inet.h>
#include "lang/verify.h"
#include "yfs_client.h"
using namespace std;
int myid;
yfs_client *yfs;
int id() {
return myid;
}
//cant hold lock
yfs_client::status
getattr(yfs_client::inum inum, struct stat &st)
{
yfs_client::status ret;
bzero(&st, sizeof(st));
st.st_ino = inum;
printf("getattr %016llx %d\n", inum, yfs->isfile(inum));
if(yfs->isfile(inum)){
yfs_client::fileinfo info;
ret = yfs->getfile(inum, info);
if(ret != yfs_client::OK)
return ret;
st.st_mode = S_IFREG | 0666;
st.st_nlink = 1;
st.st_atime = info.atime;
st.st_mtime = info.mtime;
st.st_ctime = info.ctime;
st.st_size = info.size;
printf(" getattr -> size: %llu\n", info.size);
} else {
yfs_client::dirinfo info;
ret = yfs->getdir(inum, info);
if(ret != yfs_client::OK)
return ret;
st.st_mode = S_IFDIR | 0777;
st.st_nlink = 2;
st.st_atime = info.atime;
st.st_mtime = info.mtime;
st.st_ctime = info.ctime;
printf(" getattr -> %lu %lu %lu\n", info.atime, info.mtime, info.ctime);
}
return yfs_client::OK;
}
void
fuseserver_getattr(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
yfs_client::yfs_lock lock(yfs->lc,ino);
struct stat st;
yfs_client::inum inum = ino; // req->in.h.nodeid;
yfs_client::status ret;
ret = getattr(inum, st);
if(ret != yfs_client::OK){
fuse_reply_err(req, ENOENT);
return;
}
fuse_reply_attr(req, &st, 0);
}
void
fuseserver_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, int to_set, struct fuse_file_info *fi)
{
printf("fuseserver_setattr 0x%x\n", to_set);
yfs_client::yfs_lock lock(yfs->lc,ino);
if (FUSE_SET_ATTR_SIZE & to_set) {
printf(" fuseserver_setattr set size to %zu\n", attr->st_size);
struct stat st;
// You fill this in for Lab 2
if(getattr(ino,st)!=yfs_client::OK){
printf("\n failed to getattr in setattr");
fuse_reply_err(req, ENOSYS);
return;
}
string buf;
if(yfs->get(ino,buf)!=yfs_client::OK){
printf("\n failed to get buffer from yfs client.");
fuse_reply_err(req, ENOSYS);
return;
}
if(st.st_size != buf.length()){
printf("\n size attribute was off in the yfs_client (setattr)");
}
if(st.st_size>(attr->st_size))
{
//need to truncate
int trunc = st.st_size-(attr->st_size);
printf("\n truncating file size by %d",trunc);
buf = buf.substr(0,attr->st_size);
}else if(st.st_size<(attr->st_size)){
//need to pad
int padNum = (attr->st_size)-st.st_size;
printf("\n padding with %d bytes",padNum);
int i;
for(i=0;i<padNum;i++)
{
buf.append(" ");
}
}
//else we need do nothing
if(yfs->put(ino,buf)!=yfs_client::OK){
printf("\n unable to put string back in yfs");
fuse_reply_err(req, ENOSYS);
return;
}
//get attr back from the source
if(getattr(ino,st)!=yfs_client::OK){
printf("\n failed to getattr in setattr (2)");
fuse_reply_err(req, ENOSYS);
return;
}
fuse_reply_attr(req, &st, 0);
} else {
fuse_reply_err(req, ENOSYS);
}
}
void
fuseserver_read(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
printf("\nReading file with inode %lu",ino);
//printf("\noffset is %u and size is %u",off,size);
yfs_client::yfs_lock lock(yfs->lc,ino);
cout << "\noffset is "<<off<<" and size is "<<size;
// You fill this in for Lab 2
string buf;
if(yfs->get(ino,buf)!=yfs_client::OK){
printf("\n failed to get from yfs client in fuse read");
fuse_reply_err(req, ENOSYS);
return;
}
printf("\n yfs client returned string %s",buf.c_str());
//if(size==0) size = buf.length();
//const char *b = buf.substr(off,size).c_str();
char * b = (char *) malloc(size);
memcpy(b,buf.data()+off,size);
fuse_reply_buf(req, b, size);
printf("\nRead file, returned: %s",b);
free(b);
return;
}
void
fuseserver_write(fuse_req_t req, fuse_ino_t ino,
const char *buf, size_t size, off_t off,
struct fuse_file_info *fi)
{
printf("\nWriting to file %lu",ino);
yfs_client::yfs_lock lock(yfs->lc,ino);
// You fill this in for Lab 2
string s;
if(yfs->get(ino,s)!=yfs_client::OK){
printf("\n failed to get string from yfs client");
fuse_reply_err(req, ENOSYS);
return;
}
//cout <<"\nGiven size is "<<size<< " and buf size is "<< strlen(buf);
string end;
int length = s.length();
//writing past length
if(off>length){
s.append((size_t)(off-length),'\0');
s.append(buf,size);
}else{
//if theres leftover string
if(off + size < length)
end = s.substr(off+size,length);
s = s.substr(0,off);
s = s.append(buf,size);
if(off+size < length)
s.append(end);
}
printf("\n writing size %d string %s to file",size,s.c_str());
if(yfs->put(ino,s)!=yfs_client::OK){
printf("\n failed to write to yfs client");
fuse_reply_err(req, ENOSYS);
return;
}
fuse_reply_write(req, size);
}
//DONE lock both parent and child
yfs_client::status
fuseserver_createhelper(fuse_ino_t parent, const char *name,
mode_t mode, struct fuse_entry_param *e)
{
printf("\nCreating file in fuse with name %s under parent %lu",name,parent);
yfs_client::yfs_lock lock(yfs->lc,parent);
// In yfs, timeouts are always set to 0.0, and generations are always set to 0
e->attr_timeout = 0.0;
e->entry_timeout = 0.0;
e->generation = 0;
// You fill this in for Lab 2
//fill in e->ino (inode) (unsigned long)
yfs_client::inum ino;
//generate ino with rand and set file bit to 1
ino = rand();
ino = ino | 0x80000000;
//lock child
yfs_client::yfs_lock lock_child(yfs->lc,ino);
yfs_client::inum yfs_parent = parent;
int ret = yfs->create(yfs_parent,name,ino,1);
if(ret!=yfs_client::OK){
printf("\nfuse failed to create file in create helper.");
return ret;
}
//fill in e->attr which is a stat struct with getattr call
struct stat st;
ret = getattr(ino,st);
if(ret!=yfs_client::OK){
printf("\nfuse failed to getattr in create helper.");
return ret;
}
//fill in data
e->ino = ino;
e->attr = st;
printf("\nFile created with inode %llu",ino);
return yfs_client::OK;
}
void
fuseserver_create(fuse_req_t req, fuse_ino_t parent, const char *name,
mode_t mode, struct fuse_file_info *fi)
{
struct fuse_entry_param e;
yfs_client::status ret;
if( (ret = fuseserver_createhelper( parent, name, mode, &e )) == yfs_client::OK ) {
fuse_reply_create(req, &e, fi);
} else {
if (ret == yfs_client::EXIST) {
fuse_reply_err(req, EEXIST);
}else{
fuse_reply_err(req, ENOENT);
}
}
}
void fuseserver_mknod( fuse_req_t req, fuse_ino_t parent,
const char *name, mode_t mode, dev_t rdev ) {
struct fuse_entry_param e;
yfs_client::status ret;
if( (ret = fuseserver_createhelper( parent, name, mode, &e )) == yfs_client::OK ) {
fuse_reply_entry(req, &e);
} else {
if (ret == yfs_client::EXIST) {
fuse_reply_err(req, EEXIST);
}else{
fuse_reply_err(req, ENOENT);
}
}
}
void
fuseserver_lookup(fuse_req_t req, fuse_ino_t parent, const char *name)
{
struct fuse_entry_param e;
// In yfs, timeouts are always set to 0.0, and generations are always set to 0
e.attr_timeout = 0.0;
e.entry_timeout = 0.0;
e.generation = 0;
bool found = false;
// You fill this in for Lab 2
// Look up the file named `name' in the directory referred to by
// `parent' in YFS. If the file was found, initialize e.ino and
// e.attr appropriately.
yfs_client::yfs_lock lock(yfs->lc,parent);
yfs_client::inum ino;
if(yfs->lookup(parent,name,ino)!=yfs_client::OK){
printf("\nLookup failed in fuse for name %s and parent id %lu",name,parent);
}else{
printf("\nLookup in fuse found id %llu",ino);
yfs_client::yfs_lock lock_child(yfs->lc,ino);
found = true;
e.ino = ino;
struct stat st;
if(getattr(ino,st)!=yfs_client::OK){
printf("\nfailed to getattr in fuse lookup");
found = false;
}else{
printf("\nLookup in fuse succeeded, found attributes.");
e.attr = st;
}
}
if (found)
fuse_reply_entry(req, &e);
else
fuse_reply_err(req, ENOENT);
}
struct dirbuf {
char *p;
size_t size;
};
void dirbuf_add(struct dirbuf *b, const char *name, fuse_ino_t ino)
{
struct stat stbuf;
size_t oldsize = b->size;
b->size += fuse_dirent_size(strlen(name));
b->p = (char *) realloc(b->p, b->size);
memset(&stbuf, 0, sizeof(stbuf));
stbuf.st_ino = ino;
fuse_add_dirent(b->p + oldsize, name, &stbuf, b->size);
}
#define min(x, y) ((x) < (y) ? (x) : (y))
int reply_buf_limited(fuse_req_t req, const char *buf, size_t bufsize,
off_t off, size_t maxsize)
{
if (off < bufsize)
return fuse_reply_buf(req, buf + off, min(bufsize - off, maxsize));
else
return fuse_reply_buf(req, NULL, 0);
}
void
fuseserver_readdir(fuse_req_t req, fuse_ino_t ino, size_t size,
off_t off, struct fuse_file_info *fi)
{
yfs_client::inum inum = ino; // req->in.h.nodeid;
struct dirbuf b;
printf("fuseserver_readdir\n");
if(!yfs->isdir(inum)){
fuse_reply_err(req, ENOTDIR);
return;
}
memset(&b, 0, sizeof(b));
// You fill this in for Lab 2
// Ask the yfs_client for the file names / i-numbers
// in directory inum, and call dirbuf_add() for each.
vector<yfs_client::dirent> dir_vector;
if(yfs->readdir(inum,dir_vector)==yfs_client::OK){
vector<yfs_client::dirent>::iterator it;
for(it = dir_vector.begin();it!=dir_vector.end();++it){
yfs_client::dirent tmp = *it;
dirbuf_add(&b,tmp.name.c_str(),tmp.inum);
}
}
reply_buf_limited(req, b.p, b.size, off, size);
free(b.p);
}
void
fuseserver_open(fuse_req_t req, fuse_ino_t ino,
struct fuse_file_info *fi)
{
fuse_reply_open(req, fi);
}
//DONE lock both parent and child
void
fuseserver_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name,
mode_t mode)
{
struct fuse_entry_param e;
// You fill this in for Lab 3
printf("\nCreating directory in fuse with name %s under parent %lu",name,parent);
// In yfs, timeouts are always set to 0.0, and generations are always set to 0
e.attr_timeout = 0.0;
e.entry_timeout = 0.0;
e.generation = 0;
//fill in e->ino (inode) (unsigned long)
yfs_client::inum ino;
//generate ino with rand and set file bit to 0
ino = rand();
ino = ino & 0x7fffffff;
yfs_client::yfs_lock lock_child(yfs->lc,ino);
yfs_client::inum yfs_parent = parent;
//create dir in yfs client
int ret = yfs->create(yfs_parent,name,ino,0);
if(ret!=yfs_client::OK){
printf("\nfuse failed to create a directory in create helper.");
fuse_reply_err(req, ENOSYS);
return;
}
//fill in e->attr which is a stat struct with getattr call
struct stat st;
ret = getattr(ino,st);
if(ret!=yfs_client::OK){
printf("\nfuse failed to getattr in create helper.");
fuse_reply_err(req, ENOSYS);
return;
}
//fill in data
e.ino = ino;
e.attr = st;
printf("\nDirectory created with inode %llu",ino);
fuse_reply_entry(req, &e);
}
//DONE lock both parent and ino
void
fuseserver_unlink(fuse_req_t req, fuse_ino_t parent, const char *name)
{
printf("\nUnlinking file with name %s and parent %lu",name,parent);
yfs_client::yfs_lock lock(yfs->lc,parent);
//first lookup inum
yfs_client::inum ino;
if(yfs->lookup(parent,name,ino)!=yfs_client::OK){
printf("\n failed to lookup the file");
fuse_reply_err(req, ENOSYS);
return;
}
yfs_client::yfs_lock lock_child(yfs->lc,ino);
//then call remove on yfs client which also removes from parent
if(yfs->remove(parent,ino)!=yfs_client::OK){
printf("\n failed to remove from yfs client (fuse)");
fuse_reply_err(req, ENOSYS);
return;
}
printf("\n Succesfully unlinked file (fuse)");
fuse_reply_err(req, 0);
// You fill this in for Lab 3
// Success: fuse_reply_err(req, 0);
// Not found: fuse_reply_err(req, ENOENT);
}
void
fuseserver_statfs(fuse_req_t req)
{
struct statvfs buf;
printf("statfs\n");
memset(&buf, 0, sizeof(buf));
buf.f_namemax = 255;
buf.f_bsize = 512;
fuse_reply_statfs(req, &buf);
}
struct fuse_lowlevel_ops fuseserver_oper;
int
main(int argc, char *argv[])
{
char *mountpoint = 0;
int err = -1;
int fd;
setvbuf(stdout, NULL, _IONBF, 0);
if(argc != 4){
fprintf(stderr, "Usage: yfs_client <mountpoint> <port-extent-server> <port-lock-server>\n");
exit(1);
}
mountpoint = argv[1];
srandom(getpid());
myid = random();
yfs = new yfs_client(argv[2], argv[3]);
fuseserver_oper.getattr = fuseserver_getattr;
fuseserver_oper.statfs = fuseserver_statfs;
fuseserver_oper.readdir = fuseserver_readdir;
fuseserver_oper.lookup = fuseserver_lookup;
fuseserver_oper.create = fuseserver_create;
fuseserver_oper.mknod = fuseserver_mknod;
fuseserver_oper.open = fuseserver_open;
fuseserver_oper.read = fuseserver_read;
fuseserver_oper.write = fuseserver_write;
fuseserver_oper.setattr = fuseserver_setattr;
fuseserver_oper.unlink = fuseserver_unlink;
fuseserver_oper.mkdir = fuseserver_mkdir;
const char *fuse_argv[20];
int fuse_argc = 0;
fuse_argv[fuse_argc++] = argv[0];
#ifdef __APPLE__
fuse_argv[fuse_argc++] = "-o";
fuse_argv[fuse_argc++] = "nolocalcaches"; // no dir entry caching
fuse_argv[fuse_argc++] = "-o";
fuse_argv[fuse_argc++] = "daemon_timeout=86400";
#endif
// everyone can play, why not?
//fuse_argv[fuse_argc++] = "-o";
//fuse_argv[fuse_argc++] = "allow_other";
fuse_argv[fuse_argc++] = mountpoint;
fuse_argv[fuse_argc++] = "-d";
fuse_args args = FUSE_ARGS_INIT( fuse_argc, (char **) fuse_argv );
int foreground;
int res = fuse_parse_cmdline( &args, &mountpoint, 0 /*multithreaded*/,
&foreground );
if( res == -1 ) {
fprintf(stderr, "fuse_parse_cmdline failed\n");
return 0;
}
args.allocated = 0;
fd = fuse_mount(mountpoint, &args);
if(fd == -1){
fprintf(stderr, "fuse_mount failed\n");
exit(1);
}
struct fuse_session *se;
se = fuse_lowlevel_new(&args, &fuseserver_oper, sizeof(fuseserver_oper),
NULL);
if(se == 0){
fprintf(stderr, "fuse_lowlevel_new failed\n");
exit(1);
}
struct fuse_chan *ch = fuse_kern_chan_new(fd);
if (ch == NULL) {
fprintf(stderr, "fuse_kern_chan_new failed\n");
exit(1);
}
fuse_session_add_chan(se, ch);
// err = fuse_session_loop_mt(se); // FK: wheelfs does this; why?
err = fuse_session_loop(se);
fuse_session_destroy(se);
close(fd);
fuse_unmount(mountpoint);
return err ? 1 : 0;
}