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Commit 061e9746 authored by OGAWA Hirofumi's avatar OGAWA Hirofumi Committed by Linus Torvalds
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Add balance_dirty_pages_ratelimited() to cont_expand_zero() 



On the systems, ftruncate() which expand size for FAT became the cause
of OOM.  The cont_expand_zero() filled all memory with dirty pages,
and since disk is very slow, limit of page scanning was exceeded, then
it triggered OOM.

This adds balance_dirty_pages_ratelimited() to avoid filling memory
with dirty pages.

Signed-off-by: default avatarOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e69be4c9

fs/buffer.c

+2 −0
Original line number Diff line number Diff line
@@ -2246,6 +2246,8 @@ int cont_expand_zero(struct file *file, struct address_space *mapping, 
			goto out;

		BUG_ON(err != len);

		err = 0;



		balance_dirty_pages_ratelimited(mapping);

	}



	/* page covers the boundary, find the boundary offset */