Use dynamic calling for fallocate to allow sparse to compile in old Linux.

setter/src/unix/linux/CMakeLists.txt

@@ -26,6 +26,6 @@ if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     return()
 endif()
 
-add_sources(attr.c sparse.c xattr.c xattr.h volume.c volume.h)
+add_sources(attr.c sparse.c sparse.h xattr.c xattr.h volume.c volume.h)
 
 add_sub_libraries(dl)

setter/src/unix/linux/sparse.c

@@ -24,6 +24,7 @@ Copyright (C) 2011-2021 Natalia Portillo
 
 #include "../../include/consts.h"
 #define _GNU_SOURCE
+#include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
@@ -34,14 +35,24 @@ Copyright (C) 2011-2021 Natalia Portillo
 
 #include "../../log.h"
 #include "linux.h"
+#include "sparse.h"
 
 void LinuxSparse(const char* path)
 {
-    int   ret;
-    int   rc, wRc, cRc, zRc;
-    FILE* h;
-    int   i;
-    int   fd;
+    int              ret;
+    int              rc, wRc, cRc, zRc;
+    FILE*            h;
+    int              i;
+    int              fd;
+    _linux_fallocate linux_fallocate;
+
+    linux_fallocate = (_linux_fallocate)dlsym(RTLD_DEFAULT, "fallocate");
+
+    if(!linux_fallocate)
+    {
+        log_write("Error loading fallocate(2) from libc: %s\n", dlerror());
+        return;
+    }
 
     ret = chdir(path);
 
@@ -88,7 +99,7 @@ void LinuxSparse(const char* path)
         }
 
         fd  = fileno(h);
-        ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 4096, 8192);
+        ret = linux_fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 4096, 8192);
         if(ret) { zRc = errno; }
 
         ret = fclose(h);
@@ -122,7 +133,7 @@ void LinuxSparse(const char* path)
         }
 
         fd  = fileno(h);
-        ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 32768, 81920);
+        ret = linux_fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 32768, 81920);
         if(ret) { zRc = errno; }
 
         ret = fclose(h);

setter/src/unix/linux/sparse.h

@@ -0,0 +1,38 @@
+/****************************************************************************
+Aaru Data Preservation Suite
+-----------------------------------------------------------------------------
+
+    Author(s)      : Natalia Portillo
+
+--[ License ] ---------------------------------------------------------------
+     This program is free software: you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as
+     published by the Free Software Foundation, either version 3 of the
+     License, or (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+-----------------------------------------------------------------------------
+Copyright (C) 2011-2021 Natalia Portillo
+*****************************************************************************/
+
+#ifndef AARU_FSTESTER_SETTER_SRC_LINUX_SPARSE_H_
+#define AARU_FSTESTER_SETTER_SRC_LINUX_SPARSE_H_
+
+#ifndef FALLOC_FL_KEEP_SIZE
+#define FALLOC_FL_KEEP_SIZE 0x01
+#endif
+
+#ifndef FALLOC_FL_PUNCH_HOLE
+#define FALLOC_FL_PUNCH_HOLE 0x02
+#endif
+
+typedef int (*_linux_fallocate)(int fd, int mode, off_t offset, off_t len);
+
+#endif // AARU_FSTESTER_SETTER_SRC_LINUX_SPARSE_H_