From: Christoph Hellwig <hch@infradead.org>
To: linux-man@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH] fallocate.2: clarify the zeroing behavior
Date: Wed, 6 Nov 2013 05:52:31 -0800 [thread overview]
Message-ID: <20131106135231.GA3882@infradead.org> (raw)
Fallocate only zeroes space that did not previously contain data,
but leaves existing data untouched.
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/man2/fallocate.2 b/man2/fallocate.2
index f5c395d..f577ba8 100644
--- a/man2/fallocate.2
+++ b/man2/fallocate.2
@@ -44,8 +44,7 @@ The default operation (i.e.,
.I mode
is zero) of
.BR fallocate ()
-allocates and initializes to zero the disk space
-within the range specified by
+allocates the disk space within the range specified by
.I offset
and
.IR len .
@@ -54,6 +53,11 @@ The file size (as reported by
will be changed if
.IR offset + len
is greater than the file size.
+Any subregion withing the range specified by
+.I offset
+and
+.IR len .
+that did not contain data before the call will be initialized to zero.
This default behavior closely resembles the behavior of the
.BR posix_fallocate (3)
library function,
next reply other threads:[~2013-11-06 13:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-06 13:52 Christoph Hellwig [this message]
[not found] ` <20131106135231.GA3882-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2013-11-07 17:03 ` [PATCH] fallocate.2: clarify the zeroing behavior Michael Kerrisk (man-pages)
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