From 8cf73663783503d8e9ebef42e193bd90d6c84313 Mon Sep 17 00:00:00 2001
From: "Suren A. Chilingaryan" <csa@dside.dyndns.org>
Date: Thu, 29 Nov 2012 03:18:11 +0100
Subject: Big file support

---
 seqreader.c | 31 +++++++++++++++++++++++--------
 1 file changed, 23 insertions(+), 8 deletions(-)

diff --git a/seqreader.c b/seqreader.c
index 78d7eae..f06eef8 100644
--- a/seqreader.c
+++ b/seqreader.c
@@ -22,10 +22,14 @@
 #define EXTRA_BUFFERS 2
 #define WRITE_INTERVAL 1
 
+
 #define RAID_STRIP_SIZE 	256
 #define RAID_DISKS		8
 #define STRIPS_AT_ONCE		2
 
+#define FS_MIN_BLOCK_SIZE (1024 * RAID_STRIP_SIZE)
+#define FS_BLOCK_SIZE (1024 * RAID_STRIP_SIZE * RAID_DISKS)
+
 #ifdef AIO_MODE
 # define SYNC_MODE
 #endif /* AIO_MODE */
@@ -62,6 +66,7 @@ int main(int argc, char *argv[]) {
     char *buffer;
     long double mcoef = 1000000. / (1024 * 1024);
     int flags = O_RDONLY|O_NOATIME|O_LARGEFILE;
+    struct stat st;
 
 #ifdef AIO_MODE
     int i;
@@ -79,11 +84,16 @@ int main(int argc, char *argv[]) {
     posix_memalign((void**)&buffer, FASTWRITER_SYNCIO_ALIGN, BUFSIZE);
     
     if (argc < 2) {
-	printf("Usage: %s <directory|device> [skip|size]\n", argv[0]);
+	printf("Usage: %s <directory|file|device> [skip|size]\n", argv[0]);
 	exit(0);
     }
     
-    if (strstr(argv[1], "/dev/")) {
+    if (stat(argv[1], &st)) {
+	printf("stat on (%s) have failed", argv[1]);
+	exit(-1);
+    }
+    
+    if (strstr(argv[1], "/dev/")||(S_ISREG(st.st_mode))) {
 	if (argc > 2) {
 	    max_size = atol(argv[2]);
 	    max_size *= 1024 * 1024 * 1024;
@@ -125,8 +135,8 @@ int main(int argc, char *argv[]) {
 #ifdef AIO_MODE	
         err = io_submit(aio, AIO_MODE, ioptr);
         if (err != AIO_MODE) {
-    	    printf("io_submit returned %i\n", err);
-    	    perror("Failed to submit initial AIO jobs");
+    	    printf("Failed to submit initial AIO job, io_submit returned %i\n", err);
+    	    exit(-1);
 	}
 #endif /* AIO_MODE */
 	
@@ -155,7 +165,10 @@ int main(int argc, char *argv[]) {
 		for (i = 0; i < err; i++) {
 		    struct io_event *ep = &ev[events + i];
 		    int doneio = (uintptr_t)ep->data;
-	    	    if (ep->res2 || (ep->res != BLOCK_SIZE)) perror("Error in async IO");
+	    	    if (ep->res2 || (ep->res != BLOCK_SIZE)) {
+	    		printf("Error in async IO\n");
+	    		exit(-1);
+	    	    }
 		    done[doneio%(AIO_MODE + EXTRA_BUFFERS)] = 1;
 //		    printf("done (%i): %i\n", i, doneio);
 		}
@@ -169,7 +182,10 @@ int main(int argc, char *argv[]) {
 		    io_prep_pread(newio, fd, buffer + (schedio % (AIO_MODE + EXTRA_BUFFERS)) * BLOCK_SIZE, BLOCK_SIZE, schedio * BLOCK_SIZE);
 		    io_set_callback(newio, (void*)(uintptr_t)schedio);
 		    err = io_submit(aio, 1, &newio);
-		    if (err != 1) perror("Failed to submit AIO jobs");
+		    if (err != 1) {
+			printf("Failed to submit AIO jobs %i", err);
+			exit(-1);
+		    }
 		    schedio++;
 		}
 		events = i + 1;
@@ -249,8 +265,6 @@ int main(int argc, char *argv[]) {
       skip = 0;
       dir = opendir(".");
       while ((ent = readdir(dir))) {
-	struct stat st;
-	
 	if (((skip++)%SKIP) != run) continue;
 
 	if (stat(ent->d_name, &st)) continue;
@@ -268,6 +282,7 @@ int main(int argc, char *argv[]) {
 # ifdef FS_SYNC_MODE
 	if (size < BLOCK_SIZE) size = BLOCK_SIZE;
 # endif /* FS_SYNC_MODE */
+	if (size < FS_MIN_BLOCK_SIZE) size = FS_BLOCK_SIZE;
 #endif	
 
 	if (!files)
-- 
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