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Create sparse files on UNIX and when Linux does not have fallocate available.

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Natalia Portillo
2021-03-30 02:29:00 +01:00
parent 9c4703b11f
commit 3827aae827
3 changed files with 128 additions and 19 deletions
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124
setter/src/unix/sparse.c
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@@ -22,15 +22,133 @@ Aaru Data Preservation Suite
Copyright (C) 2011-2021 Natalia Portillo
*****************************************************************************/
#include "../include/defs.h"
#if defined(__linux__) || defined(__LINUX__) || defined(__gnu_linux)
#define _GNU_SOURCE
#include <dlfcn.h>
#include "../linux/linux.h"
#endif
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>
#include <unistd.h>
#include "../include/consts.h"
#include "../include/defs.h"
#include "../log.h"
void Sparse(const char* path)
{
int ret;
int rc, wRc, cRc;
FILE* h;
int i;
#if defined(__linux__) || defined(__LINUX__) || defined(__gnu_linux)
LinuxSparse(path);
void* linux_fallocate;
linux_fallocate = dlsym(RTLD_DEFAULT, "fallocate");
if(linux_fallocate)
{
LinuxSparse(path);
return;
}
#endif
ret = chdir(path);
if(ret)
{
log_write("Error %d changing to specified path.\n", errno);
return;
}
ret = mkdir("SPARSE", 0755);
if(ret)
{
log_write("Error %d creating working directory.\n", errno);
return;
}
ret = chdir("SPARSE");
if(ret)
{
log_write("Error %d changing to working directory.\n", errno);
return;
}
log_write("Creating sparse files.\n");
h = fopen("SMALL", "w+");
rc = 0;
wRc = 0;
cRc = 0;
if(h == NULL) { rc = errno; }
else
{
for(i = 0; i < 4096; i += CLAUNIA_SIZE)
{
ret = fwrite(clauniaBytes, CLAUNIA_SIZE, 1, h);
if(ret < 0)
{
wRc = errno;
break;
}
}
fseek(h, 8192, SEEK_CUR);
for(i = 4096 + 8192; i < 4096 * 4; i += CLAUNIA_SIZE)
{
ret = fwrite(clauniaBytes, CLAUNIA_SIZE, 1, h);
if(ret < 0)
{
wRc = errno;
break;
}
}
ret = fclose(h);
if(ret) { cRc = errno; }
}
log_write("\tFile name = \"%s\", size = %d, rc = %d, wRc = %d, cRc = %d\n", "SMALL", 4096 * 4, rc, wRc, cRc);
h = fopen("BIG", "w+");
rc = 0;
wRc = 0;
cRc = 0;
if(h == NULL) { rc = errno; }
else
{
for(i = 0; i < 4096 * 8; i += CLAUNIA_SIZE)
{
ret = fwrite(clauniaBytes, CLAUNIA_SIZE, 1, h);
if(ret < 0)
{
wRc = errno;
break;
}
}
fseek(h, 81920, SEEK_CUR);
for(i = 32768 + 81920; i < 4096 * 30; i += CLAUNIA_SIZE)
{
ret = fwrite(clauniaBytes, CLAUNIA_SIZE, 1, h);
if(ret < 0)
{
wRc = errno;
break;
}
}
}
log_write("\tFile name = \"%s\", size = %d, rc = %d, wRc = %d, cRc = %d\n", "BIG", 4096 * 30, rc, wRc, cRc);
}