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

[Li Wang]

Signed-off-by: Li Wang <liwang@xxxxxxxxxxxxxxx>
Signed-off-by: Yunchuan Wen <yunchuanwen@xxxxxxxxxxxxxxx>
---
 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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