linux-kernel - [PATCH 3/3] Fadvise: Add the ability for directory level page cache cleaning

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Date:	Mon, 30 Dec 2013 21:45:18 +0800
From:	Li Wang <liwang@...ntukylin.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Zefan Li <lizefan@...wei.com>, Matthew Wilcox <matthew@....cx>,
	Li Wang <liwang@...ntukylin.com>,
	Yunchuan Wen <yunchuanwen@...ntukylin.com>
Subject: [PATCH 3/3] Fadvise: Add the ability for directory level page cache cleaning


Signed-off-by: Li Wang <liwang@...ntukylin.com>
Signed-off-by: Yunchuan Wen <yunchuanwen@...ntukylin.com>
---
 mm/fadvise.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/fadvise.c b/mm/fadvise.c
index 3bcfd81..644d32d 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -113,6 +113,10 @@ SYSCALL_DEFINE4(fadvise64_64, int, fd, loff_t, offset, loff_t, len, int, advice)
 	case POSIX_FADV_NOREUSE:
 		break;
 	case POSIX_FADV_DONTNEED:
+		if (S_ISDIR(file_inode(f.file)->i_mode)) {
+			shrink_pagecache_parent(f.file->f_dentry);
+			goto out;
+		}
 		if (!bdi_write_congested(mapping->backing_dev_info))
 			__filemap_fdatawrite_range(mapping, offset, endbyte,
 						   WB_SYNC_NONE);
-- 
1.7.9.5

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