sparse: add sparse file creation tools to the git

sparse_file_write.c: This program takes the filename and the size as
                     the argument from the user (default size 5GB) and
                     creates the sparse file with the name and the size
                     provided.
sparse_file_alt.c:   This program will create a sparse file with alternate
                     empty blocks and data blocks. Takes the path as the
                     argument

Change-Id: I8dfc95c933167fefc53fb0b665f234997aa0c68f
Signed-off-by: Raghavendra Bhat <raghavendrabhat@gluster.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/c_pgms/sparse/sparse_file_alt.c b/c_pgms/sparse/sparse_file_alt.c
new file mode 100644
index 0000000..4afaa37
--- /dev/null
+++ b/c_pgms/sparse/sparse_file_alt.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#define BLOCK_SIZE 4096
+
+void *buf;
+
+int main(int argc, char **argv)
+{
+        buf = malloc (512);
+        memset (buf,"a",512);
+        int fd = 0;
+        int i;
+        int sector_per_block = BLOCK_SIZE/512;
+        int block_count = 4;
+
+        if(argc != 2) {
+                printf ("Wrong usage\n USAGE: program absolute_path_to_write\n");
+                _exit (-1);
+        }
+
+        fd = open (argv[1],O_RDWR | O_CREAT,0666);
+        if (fd <= 0) {
+                printf ("file open failed\n");
+                _exit (0);
+        }
+
+        while (block_count > 0) {
+                lseek (fd, BLOCK_SIZE, SEEK_CUR);
+                block_count--;
+
+                for(i = 0; i < sector_per_block; i++)
+                        write (fd, buf, 512);
+
+                block_count--;
+        }
+
+        close(fd);
+
+        return 0;
+}