/**
* returns 0 on success, or an errno value on failure.
* errno values include ENOENT if the parent folder doesn't exist,
* plus the errno values set by tr_mkdirp() and open().
*/
static int
TrOpenFile( int i,
const char * folder,
const char * torrentFile,
int doWrite,
int doPreallocate,
uint64_t desiredFileSize )
{
struct tr_openfile * file = &gFd->open[i];
int flags;
char * filename;
struct stat sb;
int alreadyExisted;
/* confirm the parent folder exists */
if( stat( folder, &sb ) || !S_ISDIR( sb.st_mode ) )
return ENOENT;
/* create subfolders, if any */
filename = tr_buildPath( folder, torrentFile, NULL );
if( doWrite )
{
char * tmp = tr_dirname( filename );
const int err = tr_mkdirp( tmp, 0777 ) ? errno : 0;
tr_free( tmp );
if( err ) {
tr_free( filename );
return err;
}
}
alreadyExisted = !stat( filename, &sb ) && S_ISREG( sb.st_mode );
if( doWrite && !alreadyExisted && doPreallocate )
if( preallocateFile( filename, desiredFileSize ) )
tr_inf( _( "Preallocated file \"%s\"" ), filename );
/* open the file */
flags = doWrite ? ( O_RDWR | O_CREAT ) : O_RDONLY;
#ifdef O_LARGEFILE
flags |= O_LARGEFILE;
#endif
#ifdef WIN32
flags |= O_BINARY;
#endif
file->fd = open( filename, flags, 0666 );
if( file->fd == -1 )
{
const int err = errno;
tr_err( _( "Couldn't open \"%1$s\": %2$s" ), filename,
tr_strerror( err ) );
tr_free( filename );
return err;
}
tr_free( filename );
return 0;
}
void
libttest_zero_torrent_populate (tr_torrent * tor, bool complete)
{
tr_file_index_t i;
for (i=0; i<tor->info.fileCount; ++i)
{
int err;
uint64_t j;
FILE * fp;
char * path;
char * dirname;
const tr_file * file = &tor->info.files[i];
struct stat sb;
if (!complete && (i==0))
path = tr_strdup_printf ("%s%c%s.part", tor->currentDir, TR_PATH_DELIMITER, file->name);
else
path = tr_strdup_printf ("%s%c%s", tor->currentDir, TR_PATH_DELIMITER, file->name);
dirname = tr_dirname (path);
tr_mkdirp (dirname, 0700);
fp = fopen (path, "wb+");
for (j=0; j<file->length; ++j)
fputc (((!complete) && (i==0) && (j<tor->info.pieceSize)) ? '\1' : '\0', fp);
fclose (fp);
tr_free (dirname);
tr_free (path);
path = tr_torrentFindFile (tor, i);
assert (path != NULL);
err = errno;
errno = 0;
stat (path, &sb);
assert (errno == 0);
errno = err;
tr_free (path);
}
sync ();
libttest_blockingTorrentVerify (tor);
if (complete)
assert (tr_torrentStat(tor)->leftUntilDone == 0);
else
assert (tr_torrentStat(tor)->leftUntilDone == tor->info.pieceSize);
}
static void
create_text_file (const char * path, const char * contents)
{
FILE * fp;
char * dir;
dir = tr_dirname (path);
tr_mkdirp (dir, 0700);
tr_free (dir);
tr_remove (path);
fp = fopen (path, "w+");
fprintf (fp, "%s", contents);
fclose (fp);
sync ();
}
/**
* returns 0 on success, or an errno value on failure.
* errno values include ENOENT if the parent folder doesn't exist,
* plus the errno values set by tr_mkdirp () and open ().
*/
static int
cached_file_open (struct tr_cached_file * o,
const char * filename,
bool writable,
tr_preallocation_mode allocation,
uint64_t file_size)
{
int flags;
struct stat sb;
bool alreadyExisted;
/* create subfolders, if any */
if (writable)
{
char * dir = tr_dirname (filename);
const int err = tr_mkdirp (dir, 0777) ? errno : 0;
if (err) {
tr_err (_("Couldn't create \"%1$s\": %2$s"), dir, tr_strerror (err));
tr_free (dir);
return err;
}
tr_free (dir);
}
alreadyExisted = !stat (filename, &sb) && S_ISREG (sb.st_mode);
if (writable && !alreadyExisted && (allocation == TR_PREALLOCATE_FULL))
if (preallocate_file_full (filename, file_size))
tr_dbg ("Preallocated file \"%s\"", filename);
/* open the file */
flags = writable ? (O_RDWR | O_CREAT) : O_RDONLY;
flags |= O_LARGEFILE | O_BINARY | O_SEQUENTIAL;
o->fd = open (filename, flags, 0666);
if (o->fd == -1)
{
const int err = errno;
tr_err (_("Couldn't open \"%1$s\": %2$s"), filename, tr_strerror (err));
return err;
}
/* If the file already exists and it's too large, truncate it.
* This is a fringe case that happens if a torrent's been updated
* and one of the updated torrent's files is smaller.
* http://trac.transmissionbt.com/ticket/2228
* https://bugs.launchpad.net/ubuntu/+source/transmission/+bug/318249
*/
if (alreadyExisted && (file_size < (uint64_t)sb.st_size))
{
if (ftruncate (o->fd, file_size) == -1)
{
const int err = errno;
tr_err (_("Couldn't truncate \"%1$s\": %2$s"), filename, tr_strerror (err));
return err;
}
}
if (writable && !alreadyExisted && (allocation == TR_PREALLOCATE_SPARSE))
preallocate_file_sparse (o->fd, file_size);
/* Many (most?) clients request blocks in ascending order,
* so increase the readahead buffer.
* Also, disable OS-level caching because "inactive memory" angers users. */
tr_set_file_for_single_pass (o->fd);
return 0;
}
/**
* returns 0 on success, or an errno value on failure.
* errno values include ENOENT if the parent folder doesn't exist,
* plus the errno values set by tr_mkdirp() and open().
*/
static int
TrOpenFile( tr_session * session,
int i,
const char * filename,
tr_bool doWrite,
tr_preallocation_mode preallocationMode,
uint64_t desiredFileSize )
{
int flags;
struct stat sb;
tr_bool alreadyExisted;
struct tr_openfile * file;
assert( tr_isSession( session ) );
assert( session->fdInfo != NULL );
file = &session->fdInfo->openFiles[i];
/* create subfolders, if any */
if( doWrite )
{
char * dir = tr_dirname( filename );
const int err = tr_mkdirp( dir, 0777 ) ? errno : 0;
if( err ) {
tr_err( _( "Couldn't create \"%1$s\": %2$s" ), dir, tr_strerror( err ) );
tr_free( dir );
return err;
}
tr_free( dir );
}
alreadyExisted = !stat( filename, &sb ) && S_ISREG( sb.st_mode );
if( doWrite && !alreadyExisted && ( preallocationMode == TR_PREALLOCATE_FULL ) )
if( preallocateFileFull( filename, desiredFileSize ) )
tr_dbg( _( "Preallocated file \"%s\"" ), filename );
/* open the file */
flags = doWrite ? ( O_RDWR | O_CREAT ) : O_RDONLY;
#ifdef O_SEQUENTIAL
flags |= O_SEQUENTIAL;
#endif
#ifdef O_LARGEFILE
flags |= O_LARGEFILE;
#endif
#ifdef WIN32
flags |= O_BINARY;
#endif
file->fd = open( filename, flags, 0666 );
if( file->fd == -1 )
{
const int err = errno;
tr_err( _( "Couldn't open \"%1$s\": %2$s" ), filename, tr_strerror( err ) );
return err;
}
/* If the file already exists and it's too large, truncate it.
* This is a fringe case that happens if a torrent's been updated
* and one of the updated torrent's files is smaller.
* http://trac.transmissionbt.com/ticket/2228
* https://bugs.launchpad.net/ubuntu/+source/transmission/+bug/318249
*/
if( alreadyExisted && ( desiredFileSize < (uint64_t)sb.st_size ) )
ftruncate( file->fd, desiredFileSize );
if( doWrite && !alreadyExisted && ( preallocationMode == TR_PREALLOCATE_SPARSE ) )
preallocateFileSparse( file->fd, desiredFileSize );
#ifdef HAVE_POSIX_FADVISE
/* this doubles the OS level readahead buffer, which in practice
* turns out to be a good thing, because many (most?) clients request
* chunks of blocks in order.
* It's okay for this to fail silently, so don't let it affect errno */
{
const int err = errno;
posix_fadvise( file->fd, 0, 0, POSIX_FADV_SEQUENTIAL );
errno = err;
}
#endif
#if defined( SYS_DARWIN )
/**
* 1. Enable readahead for reasons described above w/POSIX_FADV_SEQUENTIAL.
*
* 2. Disable OS-level caching due to user reports of adverse effects of
* excessive inactive memory. However this is experimental because
* previous attempts at this have *also* had adverse effects (see r8198)
*
* It's okay for this to fail silently, so don't let it affect errno
*/
{
const int err = errno;
fcntl( file->fd, F_NOCACHE, 1 );
fcntl( file->fd, F_RDAHEAD, 1 );
errno = err;
}
#endif
return 0;
}
