From b5c60fc7870a66d89de571e96596b0745edcd6d9 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko
Date: Sun, 27 Jan 2008 23:41:34 +0000
Subject: mkswap, readahead: stop using fdlength, it is reported to be
 unreliable

---
 miscutils/readahead.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'miscutils')

diff --git a/miscutils/readahead.c b/miscutils/readahead.c
index 7b375cf..fb71ce8 100644
--- a/miscutils/readahead.c
+++ b/miscutils/readahead.c
@@ -22,9 +22,16 @@ int readahead_main(int argc, char **argv)
 	while (*++argv) {
 		int fd = open_or_warn(*argv, O_RDONLY);
 		if (fd >= 0) {
-			int r = readahead(fd, 0, fdlength(fd));
+			off_t len;
+			int r;
+
+			/* fdlength was reported to be unreliable - use seek */
+			len = xlseek(fd, 0, SEEK_END);
+			xlseek(fd, 0, SEEK_SET);
+			r = readahead(fd, 0, len);
 			close(fd);
-			if (r >= 0) continue;
+			if (r >= 0)
+				continue;
 		}
 		retval = EXIT_FAILURE;
 	}
-- 
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