Commit 2743f865 authored Jun 28, 2014 by Jaegeuk Kim

f2fs: check bdi->dirty_exceeded when trying to skip data writes



If we don't check the current backing device status, balance_dirty_pages can
fall into infinite pausing routine.

This can be occurred when a lot of directories make a small number of dirty
dentry pages including files.

Reported-by: Brian Chadwick <brianchad@westnet.com.au>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent b2c08299

fs/f2fs/node.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -42,6 +42,8 @@ bool available_free_memory(struct f2fs_sb_info *sbi, int type)
		mem_size = (nm_i->nat_cnt * sizeof(struct nat_entry)) >> 12;
		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 2);
		} else if (type == DIRTY_DENTS) {
		if (sbi->sb->s_bdi->dirty_exceeded)
		return false;
		mem_size = get_pages(sbi, F2FS_DIRTY_DENTS);
		res = mem_size < ((val.totalram * nm_i->ram_thresh / 100) >> 1);
		}