f2fs: return early when trying to read null nid
If get_node_page() gets zero nid, we can return early without getting a wrong page. For example, get_dnode_of_data() can try to do that. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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@ -1059,6 +1059,10 @@ struct page *get_node_page(struct f2fs_sb_info *sbi, pgoff_t nid)
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{
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struct page *page;
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int err;
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if (!nid)
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return ERR_PTR(-ENOENT);
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f2fs_bug_on(sbi, check_nid_range(sbi, nid));
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repeat:
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page = grab_cache_page(NODE_MAPPING(sbi), nid);
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if (!page)
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