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

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commit 2743f86554 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jaegeuk Kim
2014-06-28 01:00:41 +09:00
committed by Greg Kroah-Hartman
parent 43efa53d4e
commit 3c9979727f
1 changed files with 2 additions and 0 deletions
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fs/f2fs/node.c
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@@ -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);
}