linux-kernel - [PATCH v3 7/7] manpage: update FALLOC_FL_COLLAPSE

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Date:	Sun,  8 Sep 2013 22:43:06 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	viro@...iv.linux.org.uk, mtk.manpages@...il.com, tytso@....edu,
	adilger.kernel@...ger.ca, bpm@....com, elder@...nel.org,
	hch@...radead.org, david@...morbit.com
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, xfs@....sgi.com, a.sangwan@...sung.com,
	Namjae Jeon <linkinjeon@...il.com>,
	Namjae Jeon <namjae.jeon@...sung.com>
Subject: [PATCH v3 7/7] manpage: update FALLOC_FL_COLLAPSE_RANGE flag in fallocate

From: Namjae Jeon <namjae.jeon@...sung.com>

Update FALLOC_FL_COLLAPSE_RANGE flag in fallocate.

Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@...sung.com>
---
 man2/fallocate.2 |   17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/man2/fallocate.2 b/man2/fallocate.2
index f5c395d..b042c59 100644
--- a/man2/fallocate.2
+++ b/man2/fallocate.2
@@ -7,6 +7,7 @@
 .\"
 .\" 2011-09-19: Added FALLOC_FL_PUNCH_HOLE
 .\" 2011-09-19: Substantial restructuring of the page
+.\" 2013-09-01: Added FALLOC_FL_COLLAPSE_RANGE
 .\"
 .TH FALLOCATE 2 2013-06-10 "Linux" "Linux Programmer's Manual"
 .SH NAME
@@ -109,6 +110,19 @@ does not change.
 Not all filesystems support
 .BR FALLOC_FL_PUNCH_HOLE ;
 if a filesystem doesn't support the operation, an error is returned.
+.SS Collapsing file space
+Specifiying the
+.BR FALLOC_FL_COLLAPSE_RANGE
+flag in
+.I mode
+collapse space in the byte range starting at
+.I offset
+and continuing for
+.I len
+bytes, where the offset and len are aligned with block size of filesystem.
+Within the specified range, it first de-allocates blocks and eliminates
+the hole created in this process by shifting data blocks into the hole.
+
 .SH RETURN VALUE
 On success,
 .BR fallocate ()
@@ -139,7 +153,8 @@ was less than 0, or
 .\" See "Re: [PATCH] fallocate.2: add FALLOC_FL_PUNCH_HOLE flag definition"
 .\" 21 Sep 2012
 .\" http://thread.gmane.org/gmane.linux.file-systems/48331/focus=1193526
-was less than or equal to 0.
+was less than or equal to 0 or in case of FALLOC_FL_COLLAPSE_RANGE
+offset and len are not aligned with file system's block size.
 .TP
 .B EIO
 An I/O error occurred while reading from or writing to a filesystem.
-- 
1.7.9.5

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