[PATCH][BLKPARSE/BLKTRACE] too small arrays for file names

[Vasily Tarasov <sectorsize512@gmail.com>]

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In our experiments blktrace/blkparse file names encode a lot of infomation about
the particular experiment.  We noticed that for long enough file names blkparse
does not work.

The reason is that per_cpu_info->fname[] is of 128 bytes. As a result, in
setup_file() function only part of the file name gets to ->fname[]. Then stat()
fails and we exit the function. Notice, that no error is printed in this case.

In the following patch ->fname[] size is increased to POSXI defined PATH_MAX.

Signed-off-by: Vasily Tarasov <tarasov@vasily.name>

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diff --git a/blkparse.c b/blkparse.c
index 169d491..6db7307 100644
--- a/blkparse.c
+++ b/blkparse.c
@@ -2836,7 +2836,7 @@ int main(int argc, char *argv[])
 			ofp = fdopen(STDOUT_FILENO, "w");
 			mode = _IOLBF;
 		} else {
-			char ofname[128];
+			char ofname[PATH_MAX];
 
 			snprintf(ofname, sizeof(ofname) - 1, "%s", output_name);
 			ofp = fopen(ofname, "w");
diff --git a/blktrace.h b/blktrace.h
index 8b3e031..5da6dbc 100644
--- a/blktrace.h
+++ b/blktrace.h
@@ -2,6 +2,7 @@
 #define BLKTRACE_H
 
 #include <stdio.h>
+#include <limits.h>
 #include <byteswap.h>
 #include <endian.h>
 
@@ -44,7 +45,7 @@ struct per_cpu_info {
 
 	int fd;
 	int fdblock;
-	char fname[128];
+	char fname[PATH_MAX];
 
 	struct io_stats io_stats;