This is a note to let you know that I've just added the patch titled btrfs: reject encoded write if inode has nodatasum flag set to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: btrfs-reject-encoded-write-if-inode-has-nodatasum-flag-set.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1bd96c92c6a0a4d43815eb685c15aa4b78879dc9 Mon Sep 17 00:00:00 2001 From: Filipe Manana <fdmanana@xxxxxxxx> Date: Fri, 2 Feb 2024 12:09:22 +0000 Subject: btrfs: reject encoded write if inode has nodatasum flag set From: Filipe Manana <fdmanana@xxxxxxxx> commit 1bd96c92c6a0a4d43815eb685c15aa4b78879dc9 upstream. Currently we allow an encoded write against inodes that have the NODATASUM flag set, either because they are NOCOW files or they were created while the filesystem was mounted with "-o nodatasum". This results in having compressed extents without corresponding checksums, which is a filesystem inconsistency reported by 'btrfs check'. For example, running btrfs/281 with MOUNT_OPTIONS="-o nodatacow" triggers this and 'btrfs check' errors out with: [1/7] checking root items [2/7] checking extents [3/7] checking free space tree [4/7] checking fs roots root 256 inode 257 errors 1040, bad file extent, some csum missing root 256 inode 258 errors 1040, bad file extent, some csum missing ERROR: errors found in fs roots (...) So reject encoded writes if the target inode has NODATASUM set. CC: stable@xxxxxxxxxxxxxxx # 6.1+ Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx> Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/btrfs/inode.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -10774,6 +10774,13 @@ ssize_t btrfs_do_encoded_write(struct ki if (encoded->encryption != BTRFS_ENCODED_IO_ENCRYPTION_NONE) return -EINVAL; + /* + * Compressed extents should always have checksums, so error out if we + * have a NOCOW file or inode was created while mounted with NODATASUM. + */ + if (inode->flags & BTRFS_INODE_NODATASUM) + return -EINVAL; + orig_count = iov_iter_count(from); /* The extent size must be sane. */ Patches currently in stable-queue which might be from fdmanana@xxxxxxxx are queue-6.1/btrfs-do-not-assert-if-the-newly-created-subvolume-already-got-read.patch queue-6.1/btrfs-don-t-reserve-space-for-checksums-when-writing-to-nocow-files.patch queue-6.1/btrfs-send-return-eopnotsupp-on-unknown-flags.patch queue-6.1/btrfs-don-t-drop-extent_map-for-free-space-inode-on-write-error.patch queue-6.1/btrfs-do-not-delete-unused-block-group-if-it-may-be-used-soon.patch queue-6.1/btrfs-add-and-use-helper-to-check-if-block-group-is-used.patch queue-6.1/btrfs-reject-encoded-write-if-inode-has-nodatasum-flag-set.patch