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/*
* FUSE: Filesystem in Userspace
* Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
* This program can be distributed under the terms of the GNU GPL.
* See the file COPYING.
*
* Changed by Stephan Schwaer
* */
#include "connection.h"
#include "helper.h"
#include "../shared/protocol.h"
#include "../shared/log.h"
#define FUSE_USE_VERSION 30
#include <fuse.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
/* for printing uint */
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#include <getopt.h>
#include <time.h>
#include <signal.h>
#include <pthread.h>
#define debugf(...) do { logadd( LOG_DEBUG1, __VA_ARGS__ ); } while (0)
static const char * const IMAGE_PATH = "/img";
static const char * const STATS_PATH = "/status";
static uint64_t imageSize;
/* Debug/Benchmark variables */
static bool useDebug = false;
static log_info logInfo;
static struct timespec startupTime;
static uid_t owner;
static bool keepRunning = true;
static void (*fuse_sigIntHandler)(int) = NULL;
static void (*fuse_sigTermHandler)(int) = NULL;
static struct fuse_operations dnbd3_fuse_no_operations;
#define SIGPOOLSIZE 6
static pthread_spinlock_t sigLock;
static dnbd3_signal_t *signalPool[SIGPOOLSIZE];
static dnbd3_signal_t **sigEnd = signalPool + SIGPOOLSIZE;
static void signalInit()
{
pthread_spin_init( &sigLock, PTHREAD_PROCESS_PRIVATE );
for ( size_t i = 0; i < SIGPOOLSIZE; ++i ) {
signalPool[i] = NULL;
}
}
static inline dnbd3_signal_t *signalGet()
{
pthread_spin_lock( &sigLock );
for ( dnbd3_signal_t **it = signalPool; it < sigEnd; ++it ) {
if ( *it != NULL ) {
dnbd3_signal_t *ret = *it;
*it = NULL;
pthread_spin_unlock( &sigLock );
return ret;
}
}
pthread_spin_unlock( &sigLock );
return signal_newBlocking();
}
static inline void signalPut(dnbd3_signal_t *signal)
{
pthread_spin_lock( &sigLock );
for ( dnbd3_signal_t **it = signalPool; it < sigEnd; ++it ) {
if ( *it == NULL ) {
*it = signal;
pthread_spin_unlock( &sigLock );
return;
}
}
pthread_spin_unlock( &sigLock );
signal_close( signal );
}
static int image_getattr(const char *path, struct stat *stbuf)
{
int res = 0;
memset( stbuf, 0, sizeof( struct stat ) );
stbuf->st_ctim = stbuf->st_atim = stbuf->st_mtim = startupTime;
stbuf->st_uid = owner;
if ( strcmp( path, "/" ) == 0 ) {
stbuf->st_mode = S_IFDIR | 0550;
stbuf->st_nlink = 2;
} else if ( strcmp( path, IMAGE_PATH ) == 0 ) {
stbuf->st_mode = S_IFREG | 0440;
stbuf->st_nlink = 1;
stbuf->st_size = imageSize;
} else if ( strcmp( path, STATS_PATH ) == 0 ) {
stbuf->st_mode = S_IFREG | 0440;
stbuf->st_nlink = 1;
stbuf->st_size = 4096;
clock_gettime( CLOCK_REALTIME, &stbuf->st_mtim );
} else {
res = -ENOENT;
}
return res;
}
static int image_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset UNUSED, struct fuse_file_info *fi UNUSED)
{
if ( strcmp( path, "/" ) != 0 ) {
return -ENOENT;
}
filler( buf, ".", NULL, 0 );
filler( buf, "..", NULL, 0 );
filler( buf, IMAGE_PATH + 1, NULL, 0 );
filler( buf, STATS_PATH + 1, NULL, 0 );
return 0;
}
static int image_open(const char *path, struct fuse_file_info *fi)
{
if ( strcmp( path, IMAGE_PATH ) != 0 && strcmp( path, STATS_PATH ) != 0 ) {
return -ENOENT;
}
if ( ( fi->flags & 3 ) != O_RDONLY ) {
return -EACCES;
}
return 0;
}
static int fillStatsFile(char *buf, size_t size, off_t offset) {
if ( offset == 0 ) {
return (int)connection_printStats( buf, size );
}
char buffer[4096];
int ret = (int)connection_printStats( buffer, sizeof buffer );
int len = MIN( ret - (int)offset, (int)size );
if ( len == 0 )
return 0;
if ( len < 0 ) {
return -EOF;
}
memcpy( buf, buffer + offset, len );
return len;
}
static int image_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi UNUSED)
{
if ( size > __INT_MAX__ ) {
// fuse docs say we MUST fill the buffer with exactly size bytes and return size,
// otherwise the buffer will we padded with zeros. Since the return value is just
// an int, we could not properly fulfill read requests > 2GB. Since there is no
// mention of a guarantee that this will never happen, better add a safety check.
// Way to go fuse.
return -EIO;
}
if ( path[1] == STATS_PATH[1] ) {
return fillStatsFile( buf, size, offset );
}
if ( (uint64_t)offset >= imageSize ) {
return 0;
}
if ( offset + size > imageSize ) {
size = imageSize - offset;
}
if ( useDebug ) {
/* count the requested blocks */
uint64_t startBlock = offset / ( 4096 );
const uint64_t endBlock = ( offset + size - 1 ) / ( 4096 );
for ( ; startBlock <= endBlock; startBlock++ ) {
++logInfo.blockRequestCount[startBlock];
}
}
dnbd3_async_t request;
request.buffer = buf;
request.length = (uint32_t)size;
request.offset = offset;
request.signal = signalGet();
if ( !connection_read( &request ) ) {
signalPut( request.signal );
return -EINVAL;
}
while ( !request.finished ) {
int ret = signal_wait( request.signal, 5000 );
if ( !keepRunning ) {
connection_close();
break;
}
if ( ret < 0 ) {
debugf( "fuse_read signal wait returned %d", ret );
}
}
signalPut( request.signal );
if ( request.success ) {
return request.length;
} else {
return -EIO;
}
}
static void image_sigHandler(int signum) {
keepRunning = false;
if ( signum == SIGINT && fuse_sigIntHandler != NULL ) {
fuse_sigIntHandler(signum);
}
if ( signum == SIGTERM && fuse_sigTermHandler != NULL ) {
fuse_sigTermHandler(signum);
}
}
static void* image_init(struct fuse_conn_info *conn UNUSED)
{
if ( !connection_initThreads() ) {
logadd( LOG_ERROR, "Could not initialize threads for dnbd3 connection, exiting..." );
exit( EXIT_FAILURE );
}
// Prepare our handler
struct sigaction newHandler;
memset( &newHandler, 0, sizeof(newHandler) );
newHandler.sa_handler = &image_sigHandler;
sigemptyset( &newHandler.sa_mask );
struct sigaction oldHandler;
// Retrieve old handlers when setting
sigaction( SIGINT, &newHandler, &oldHandler );
fuse_sigIntHandler = oldHandler.sa_handler;
logadd( LOG_DEBUG1, "Previous SIGINT handler was %p", (void*)(uintptr_t)fuse_sigIntHandler );
sigaction( SIGTERM, &newHandler, &oldHandler );
fuse_sigTermHandler = oldHandler.sa_handler;
logadd( LOG_DEBUG1, "Previous SIGTERM handler was %p", (void*)(uintptr_t)fuse_sigIntHandler );
return NULL;
}
/* close the connection */
static void image_destroy(void *private_data UNUSED)
{
if ( useDebug ) {
printLog( &logInfo );
}
connection_close();
return;
}
/* map the implemented fuse operations */
static struct fuse_operations image_oper = {
.getattr = image_getattr,
.readdir = image_readdir,
.open = image_open,
.read = image_read,
.init = image_init,
.destroy = image_destroy,
};
static void printVersion()
{
char *arg[] = { "foo", "-V" };
printf( "DNBD3-Fuse Version 1.2.3.4, protocol version %d\n", (int)PROTOCOL_VERSION );
fuse_main( 2, arg, &dnbd3_fuse_no_operations, NULL );
exit( 0 );
}
static void printUsage(char *argv0, int exitCode)
{
char *arg[] = { argv0, "-h" };
fuse_main( 2, arg, &dnbd3_fuse_no_operations, NULL );
printf( "\n" );
printf( "Usage: %s [--debug] [--option mountOpts] --host <serverAddress(es)> --image <imageName> [--rid revision] <mountPoint>\n", argv0 );
printf( "Or: %s [-d] [-o mountOpts] -h <serverAddress(es)> -i <imageName> [-r revision] <mountPoint>\n", argv0 );
printf( " -d --debug Don't fork, write stats file, and print debug output (fuse -> stderr, dnbd3 -> stdout)\n" );
printf( " -f Don't fork (dnbd3 -> stdout)\n" );
printf( " -h --host List of space separated hosts to use\n" );
printf( " -i --image Remote image name to request\n" );
printf( " -l --log Write log to given location\n" );
printf( " -o --option Mount options to pass to libfuse\n" );
printf( " -r --rid Revision to use (omit or pass 0 for latest)\n" );
printf( " -S --sticky Use only servers from command line (no learning from servers)\n" );
printf( " -s Single threaded mode\n" );
exit( exitCode );
}
static const char *optString = "dfHh:i:l:o:r:SsVv";
static const struct option longOpts[] = {
{ "debug", no_argument, NULL, 'd' },
{ "help", no_argument, NULL, 'H' },
{ "host", required_argument, NULL, 'h' },
{ "image", required_argument, NULL, 'i' },
{ "log", required_argument, NULL, 'l' },
{ "option", required_argument, NULL, 'o' },
{ "rid", required_argument, NULL, 'r' },
{ "sticky", no_argument, NULL, 'S' },
{ "version", no_argument, NULL, 'v' },
{ 0, 0, 0, 0 }
};
int main(int argc, char *argv[])
{
char *server_address = NULL;
char *image_Name = NULL;
char *log_file = NULL;
uint16_t rid = 0;
char **newArgv;
int newArgc;
int opt, lidx;
bool learnNewServers = true;
if ( argc <= 1 || strcmp( argv[1], "--help" ) == 0 || strcmp( argv[1], "--usage" ) == 0 ) {
printUsage( argv[0], 0 );
}
// TODO Make log mask configurable
log_setConsoleMask( 65535 );
log_setConsoleTimestamps( true );
log_setFileMask( 65535 );
newArgv = calloc( argc + 10, sizeof(char*) );
newArgv[0] = argv[0];
newArgc = 1;
while ( ( opt = getopt_long( argc, argv, optString, longOpts, &lidx ) ) != -1 ) {
switch ( opt ) {
case 'h':
server_address = optarg;
break;
case 'i':
image_Name = optarg;
break;
case 'r':
rid = (uint16_t)atoi(optarg);
break;
case 'o':
newArgv[newArgc++] = "-o";
newArgv[newArgc++] = optarg;
if ( strstr( optarg, "use_ino" ) != NULL ) {
logadd( LOG_WARNING, "************************" );
logadd( LOG_WARNING, "* WARNING: use_ino mount option is unsupported, use at your own risk!" );
logadd( LOG_WARNING, "************************" );
}
if ( strstr( optarg, "intr" ) != NULL ) {
logadd( LOG_WARNING, "************************" );
logadd( LOG_WARNING, "* WARNING: intr mount option is unsupported, use at your own risk!" );
logadd( LOG_WARNING, "************************" );
}
break;
case 'l':
log_file = optarg;
break;
case 'H':
printUsage( argv[0], 0 );
break;
case 'v':
case 'V':
printVersion();
break;
case 'd':
useDebug = true;
newArgv[newArgc++] = "-d";
break;
case 's':
newArgv[newArgc++] = "-s";
break;
case 'S':
learnNewServers = false;
break;
case 'f':
newArgv[newArgc++] = "-f";
break;
default:
printUsage( argv[0], EXIT_FAILURE );
}
}
if ( optind >= argc ) { // Missing mount point
printUsage( argv[0], EXIT_FAILURE );
}
if ( server_address == NULL || image_Name == NULL ) {
printUsage( argv[0], EXIT_FAILURE );
}
if ( log_file != NULL ) {
if ( !log_openLogFile( log_file ) ) {
logadd( LOG_WARNING, "Could not open log file at '%s'", log_file );
}
}
if ( !connection_init( server_address, image_Name, rid, learnNewServers ) ) {
logadd( LOG_ERROR, "Could not connect to any server. Bye.\n" );
return EXIT_FAILURE;
}
imageSize = connection_getImageSize();
/* initialize benchmark variables */
logInfo.receivedBytes = 0;
logInfo.imageSize = imageSize;
logInfo.imageBlockCount = ( imageSize + 4095 ) / 4096;
if ( useDebug ) {
logInfo.blockRequestCount = calloc( logInfo.imageBlockCount, sizeof(uint8_t) );
} else {
logInfo.blockRequestCount = NULL;
}
// Since dnbd3 is always read only and the remote image will not change
newArgv[newArgc++] = "-o";
newArgv[newArgc++] = "ro,auto_cache,default_permissions";
// Mount point goes last
newArgv[newArgc++] = argv[optind];
printf( "ImagePathName: %s\nFuseArgs:",IMAGE_PATH );
for ( int i = 0; i < newArgc; ++i ) {
printf( " '%s'", newArgv[i] );
}
putchar('\n');
clock_gettime( CLOCK_REALTIME, &startupTime );
owner = getuid();
signalInit();
return fuse_main( newArgc, newArgv, &image_oper, NULL );
}
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