Commit 513e2dae authored Sep 04, 2015 by Xue jiufei Committed by Linus Torvalds Sep 04, 2015

ocfs2: flush inode data to disk and free inode when i_count becomes zero



Disk inode deletion may be heavily delayed when one node unlink a file
after the same dentry is freed on another node(say N1) because of memory
shrink but inode is left in memory.  This inode can only be freed while
N1 doing the orphan scan work.

However, N1 may skip orphan scan for several times because other nodes
may do the work earlier.  In our tests, it may take 1 hour on 4 nodes
cluster and it hurts the user experience.  So we think the inode should
be freed after the data flushed to disk when i_count becomes zero to
avoid such circumstances.

Signed-off-by: Joyce.xue <xuejiufei@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 0f5e7b41

fs/ocfs2/inode.c

+8 −6

Original line number	Diff line number	Diff line
		@@ -1191,17 +1191,19 @@ void ocfs2_evict_inode(struct inode *inode)
		int ocfs2_drop_inode(struct inode *inode)
		{
		struct ocfs2_inode_info *oi = OCFS2_I(inode);
		int res;

		trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
		inode->i_nlink, oi->ip_flags);

		if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)
		res = 1;
		else
		res = generic_drop_inode(inode);
		assert_spin_locked(&inode->i_lock);
		inode->i_state \|= I_WILL_FREE;
		spin_unlock(&inode->i_lock);
		write_inode_now(inode, 1);
		spin_lock(&inode->i_lock);
		WARN_ON(inode->i_state & I_NEW);
		inode->i_state &= ~I_WILL_FREE;

		return res;
		return 1;
		}

		/*

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