linux-ext4 - [PATCH 3/3] ext4: disable COLLAPSE

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Message-id: <002b01cf59c3$878af780$96a0e680$@samsung.com>
Date:	Thu, 17 Apr 2014 07:30:54 +0900
From:	Namjae Jeon <namjae.jeon@...sung.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>,
	Lukáš Czerner <lczerner@...hat.com>
Subject: [PATCH 3/3] ext4: disable COLLAPSE_RANGE for bigalloc

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

Once COLLAPSE RANGE is be disable for ext4 with bigalloc feature till finding
root-cause of problem. It will be enable with fixing that regression of
xfstest(generic 075 and 091) again.

Signed-off-by: Namjae Jeon <namjae.jeon@...sung.com>
Signed-off-by: Ashish Sangwan <a.sangwan@...sung.com>
---
 fs/ext4/extents.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index a64242f..8d45ef8 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -5461,6 +5461,11 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len)
 		goto out_mutex;
 	}
 
+	if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) {
+		ret = -EOPNOTSUPP;
+		goto out_mutex;
+	}
+
 	truncate_pagecache_range(inode, ioffset, -1);
 
 	/* Wait for existing dio to complete */
-- 
1.7.11-rc0

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