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[iso] improve write performance during ISO extraction by preallocating the file size of each file on the target filesystem before writing to it

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The actual benefit gained from this will vary: it depends on the input ISO layout (with a large number of small files giving a bigger improvement), the target filesystem, and also the host OS because of driver differences between versions. Windows 7 seems to benefit more than Windows 10, and NTFS more than FAT32. All scenarios should see at least a minor speed gain from this however. (No actual percentage claims made upon urgent request of my lawyer)
This commit is contained in:
Mattiwatti 2018-06-24 00:59:36 +02:00
parent faebe1040f
commit acc9cec32b
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GPG key ID: D40D1DBE299B83EA
1 changed files with 50 additions and 35 deletions
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19
src/iso.c
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@ -361,6 +361,15 @@ static void __inline set_directory_timestamp(char* path, LPFILETIME creation, LP
safe_closehandle(dir_handle);
}
// Preallocates the target size of a newly created file in order to prevent fragmentation from repeated writes
static void __inline preallocate_filesize(HANDLE hFile, int64_t file_length)
{
SetFileInformationByHandle(hFile, FileEndOfFileInfo, &file_length, sizeof(file_length));
// FileAllocationInfo does not require the size to be a multiple of the cluster size; the FS driver takes care of this.
SetFileInformationByHandle(hFile, FileAllocationInfo, &file_length, sizeof(file_length));
}
// Returns 0 on success, nonzero on error
static int udf_extract_files(udf_t *p_udf, udf_dirent_t *p_udf_dirent, const char *psz_path)
{
@ -440,7 +449,9 @@ static int udf_extract_files(udf_t *p_udf, udf_dirent_t *p_udf_dirent, const cha
uprintf(stupid_antivirus);
else
goto out;
} else while (file_length > 0) {
} else {
preallocate_filesize(file_handle, file_length);
while (file_length > 0) {
if (FormatStatus) goto out;
memset(buf, 0, UDF_BLOCKSIZE);
read = udf_read_block(p_udf_dirent, buf, 1);
@ -458,6 +469,7 @@ static int udf_extract_files(udf_t *p_udf, udf_dirent_t *p_udf_dirent, const cha
if (nb_blocks++ % PROGRESS_THRESHOLD == 0)
UpdateProgress(OP_DOS, 100.0f*nb_blocks/total_blocks);
}
}
if ((preserve_timestamps) && (!SetFileTime(file_handle, to_filetime(udf_get_attribute_time(p_udf_dirent)),
to_filetime(udf_get_access_time(p_udf_dirent)), to_filetime(udf_get_modification_time(p_udf_dirent)))))
uprintf(" Could not set timestamp: %s", WindowsErrorString());
@ -586,7 +598,9 @@ static int iso_extract_files(iso9660_t* p_iso, const char *psz_path)
uprintf(stupid_antivirus);
else
goto out;
} else for (j=0; j<p_statbuf->extents; j++) {
} else {
preallocate_filesize(file_handle, file_length);
for (j=0; j<p_statbuf->extents; j++) {
extent_length = p_statbuf->extsize[j];
for (i=0; extent_length>0; i++) {
if (FormatStatus) goto out;
@ -608,6 +622,7 @@ static int iso_extract_files(iso9660_t* p_iso, const char *psz_path)
UpdateProgress(OP_DOS, 100.0f*nb_blocks/total_blocks);
}
}
}
if (preserve_timestamps) {
LPFILETIME ft = to_filetime(mktime(&p_statbuf->tm));
if (!SetFileTime(file_handle, ft, ft, ft))