| Message ID | 20190117101528.8675-6-wqu@suse.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | btrfs: Enhancement to tree block validation | expand |
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index bc2379cb2091..d95716847870 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -313,6 +313,15 @@ static int csum_tree_block(struct btrfs_fs_info *fs_info, return -EUCLEAN; } } else { + if (btrfs_header_level(buf)) + err = btrfs_check_node(fs_info, buf); + else + err = btrfs_check_leaf_full(fs_info, buf); + if (err < 0) { + btrfs_err(fs_info, + "write time tree block corruption detected"); + return err; + } write_extent_buffer(buf, result, 0, csum_size); }
There are at least 2 reports about memory bit flip sneaking into on-disk data. Currently we only have a relaxed check triggered at btrfs_mark_buffer_dirty() time, as it's not mandatory, only for CONFIG_BTRFS_FS_CHECK_INTEGRITY enabled build. This patch will address the hole by triggering comprehensive check on tree blocks before writing it back to disk. The timing is set to csum_tree_block() where @verify == 0. At that timing, we're generation csum for tree blocks before submitting the metadata bio, so we could avoid all the unnecessary calls at btrfs_mark_buffer_dirty(), but still catch enough error. The example error output will be something like: BTRFS critical (device dm-3): corrupt leaf: root=2 block=1350630375424 slot=68, bad key order, prev (10510212874240 169 0) current (1714119868416 169 0) BTRFS error (device dm-3): write time tree block corruption detected BTRFS critical (device dm-3): corrupt leaf: root=2 block=1350630375424 slot=68, bad key order, prev (10510212874240 169 0) current (1714119868416 169 0) BTRFS error (device dm-3): write time tree block corruption detected BTRFS: error (device dm-3) in btrfs_commit_transaction:2220: errno=-5 IO failure (Error while writing out transaction) BTRFS info (device dm-3): forced readonly BTRFS warning (device dm-3): Skipping commit of aborted transaction. BTRFS: error (device dm-3) in cleanup_transaction:1839: errno=-5 IO failure BTRFS info (device dm-3): delayed_refs has NO entry Reported-by: Leonard Lausen <leonard@lausen.nl> Signed-off-by: Qu Wenruo <wqu@suse.com> --- fs/btrfs/disk-io.c | 9 +++++++++ 1 file changed, 9 insertions(+)