From 68c23d09749e18e1099959e84aedcfc30fc8f633 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Wed, 23 Aug 2017 16:57:59 +0900 Subject: [PATCH] btrfs: Add checker for EXTENT_CSUM commit 4b865cab96fe2a30ed512cf667b354bd291b3b0a upstream. EXTENT_CSUM checker is a relatively easy one, only needs to check: 1) Objectid Fixed to BTRFS_EXTENT_CSUM_OBJECTID 2) Key offset alignment Must be aligned to sectorsize 3) Item size alignedment Must be aligned to csum size Signed-off-by: Qu Wenruo Reviewed-by: Nikolay Borisov Reviewed-by: David Sterba Signed-off-by: David Sterba [bwh: Backported to 4.4: Use root->sectorsize instead of root->fs_info->sectorsize] Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/disk-io.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 80ebcfd..e1ac4b8 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -605,6 +605,27 @@ static int check_extent_data_item(struct btrfs_root *root, return 0; } +static int check_csum_item(struct btrfs_root *root, struct extent_buffer *leaf, + struct btrfs_key *key, int slot) +{ + u32 sectorsize = root->sectorsize; + u32 csumsize = btrfs_super_csum_size(root->fs_info->super_copy); + + if (key->objectid != BTRFS_EXTENT_CSUM_OBJECTID) { + CORRUPT("invalid objectid for csum item", leaf, root, slot); + return -EUCLEAN; + } + if (!IS_ALIGNED(key->offset, sectorsize)) { + CORRUPT("unaligned key offset for csum item", leaf, root, slot); + return -EUCLEAN; + } + if (!IS_ALIGNED(btrfs_item_size_nr(leaf, slot), csumsize)) { + CORRUPT("unaligned csum item size", leaf, root, slot); + return -EUCLEAN; + } + return 0; +} + /* * Common point to switch the item-specific validation. */ @@ -618,6 +639,9 @@ static int check_leaf_item(struct btrfs_root *root, case BTRFS_EXTENT_DATA_KEY: ret = check_extent_data_item(root, leaf, key, slot); break; + case BTRFS_EXTENT_CSUM_KEY: + ret = check_csum_item(root, leaf, key, slot); + break; } return ret; } -- 2.7.4