vfs: conditionally call inode_wb_list_del()
Some inodes (pipes, sockets, ...) are not in bdi writeback list. evict() can avoid calling inode_wb_list_del() and its expensive spinlock by checking inode i_wb_list being empty or not. At this point, no other cpu/user can concurrently manipulate this inode i_wb_list Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -454,7 +454,9 @@ static void evict(struct inode *inode)
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BUG_ON(!(inode->i_state & I_FREEING));
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BUG_ON(!list_empty(&inode->i_lru));
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inode_wb_list_del(inode);
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if (!list_empty(&inode->i_wb_list))
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inode_wb_list_del(inode);
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inode_sb_list_del(inode);
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if (op->evict_inode) {
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