[2/3] btrfs-progs: check: verify dir item name and hash in lowmem mode
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Message ID 20170714074746.28177-2-suy.fnst@cn.fujitsu.com
State New
Headers show

Commit Message

Su Yue July 14, 2017, 7:47 a.m. UTC
Although lowmem mode can detect name and hash mismatch in dir_item,
it's done by checking inode_ref to expose such problem.

This patch will enhance dir_item check, by also comparing name and
hash when checking dir_items.

Reported-by: Filippe LeMarchand <gasinvein@gmail.com>
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
---
 cmds-check.c | 9 +++++++++
 1 file changed, 9 insertions(+)

Patch
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diff --git a/cmds-check.c b/cmds-check.c
index 55afefbc..81578439 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -4672,6 +4672,15 @@  static int check_dir_item(struct btrfs_root *root, struct btrfs_key *key,
 		read_extent_buffer(node, namebuf, (unsigned long)(di + 1), len);
 		filetype = btrfs_dir_type(node, di);
 
+		if (key->type == BTRFS_DIR_ITEM_KEY &&
+		    key->offset != btrfs_name_hash(namebuf, len)) {
+			err |= -EIO;
+			error("root %llu DIR_ITEM[%llu %llu] name %s namelen %u filetype %u mismatch with its hash, wanted %llu have %llu",
+				root->objectid, key->objectid, key->offset,
+				namebuf, len, filetype, key->offset,
+				btrfs_name_hash(namebuf, len));
+		}
+
 		btrfs_init_path(&path);
 		btrfs_dir_item_key_to_cpu(node, di, &location);