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Add balance_dirty_pages_ratelimited() to cont_expand_zero()

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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: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
OGAWA Hirofumi 2008-04-28 02:16:28 -07:00 committed by Linus Torvalds
parent e69be4c9c4
commit 061e97469f
1 changed files with 2 additions and 0 deletions
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2
fs/buffer.c
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@ -2246,6 +2246,8 @@ int cont_expand_zero(struct file *file, struct address_space *mapping,
goto out; goto out;
BUG_ON(err != len); BUG_ON(err != len);
err = 0; err = 0;
balance_dirty_pages_ratelimited(mapping);
} }
/* page covers the boundary, find the boundary offset */ /* page covers the boundary, find the boundary offset */