linux-kernel - [PATCH v3 6/6] fat: update the limitation for fat fallocate

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Date:	Wed, 25 Dec 2013 15:32:06 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	hirofumi@...l.parknet.co.jp, akpm@...ux-foundation.org
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Namjae Jeon <linkinjeon@...il.com>,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: [PATCH v3 6/6] fat: update the limitation for fat fallocate

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

update the limitation for fat fallocate.

Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@...sung.com>
---
 Documentation/filesystems/vfat.txt |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Documentation/filesystems/vfat.txt b/Documentation/filesystems/vfat.txt
index 4a93e98..5cf57b3 100644
--- a/Documentation/filesystems/vfat.txt
+++ b/Documentation/filesystems/vfat.txt
@@ -175,6 +175,16 @@ nfs=stale_rw|nostale_ro
 
 <bool>: 0,1,yes,no,true,false
 
+LIMITATION
+---------------------------------------------------------------------
+* The fallocated region of file is discarded at umount/evict time
+  when using fallocate with FALLOC_FL_KEEP_SIZE.
+  So, User should assume that fallocated region can be discarded at
+  last close if there is memory pressure resulting in eviction of
+  the inode from the memory. As a result, for any dependency on
+  the fallocated region, user should make sure to recheck fallocate
+  after reopening the file.
+
 TODO
 ----------------------------------------------------------------------
 * Need to get rid of the raw scanning stuff.  Instead, always use
-- 
1.7.9.5

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