[PATCHv2 11/13] mm, thp, tmpfs: only alloc small pages inshmem_file_splice_read

[Ning Qu]

We just hope this is not a common case path. The huge page can't be
added without completely refactoring the code.

Signed-off-by: Ning Qu <quning@xxxxxxxxx>
---
 mm/shmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index 48b1d84..c42331a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1950,6 +1950,7 @@ static ssize_t shmem_file_splice_read(struct file *in, loff_t *ppos,
 	index += spd.nr_pages;
 	error = 0;
 
+	i_split_down_read(inode);
 	while (spd.nr_pages < nr_pages) {
 		error = shmem_getpage(inode, index, &page, SGP_CACHE, gfp,
 					0, NULL);
@@ -2019,6 +2020,7 @@ static ssize_t shmem_file_splice_read(struct file *in, loff_t *ppos,
 		*ppos += error;
 		file_accessed(in);
 	}
+	i_split_up_read(inode);
 	return error;
 }
 
-- 
1.8.4

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