Commit 42c16da6 authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

btrfs: inode: Don't compress if NODATASUM or NODATACOW set

As btrfs(5) specified:

	If nodatacow or nodatasum are enabled, compression is disabled.

If NODATASUM or NODATACOW set, we should not compress the extent.

Normally NODATACOW is detected properly in run_delalloc_range() so
compression won't happen for NODATACOW.

However for NODATASUM we don't have any check, and it can cause
compressed extent without csum pretty easily, just by:
  mkfs.btrfs -f $dev
  mount $dev $mnt -o nodatasum
  touch $mnt/foobar
  mount -o remount,datasum,compress $mnt
  xfs_io -f -c "pwrite 0 128K" $mnt/foobar

And in fact, we have a bug report about corrupted compressed extent
without proper data checksum so even RAID1 can't recover the corruption.


Running compression without proper checksum could cause more damage when
corruption happens, as compressed data could make the whole extent
unreadable, so there is no need to allow compression for

The fix will refactor the inode compression check into two parts:

- inode_can_compress()
  As the hard requirement, checked at btrfs_run_delalloc_range(), so no
  compression will happen for NODATASUM inode at all.

- inode_need_compress()
  As the soft requirement, checked at btrfs_run_delalloc_range() and

Reported-by: default avatarJames Harvey <>
CC: # 4.4+
Signed-off-by: default avatarQu Wenruo <>
Reviewed-by: default avatarDavid Sterba <>
Signed-off-by: default avatarDavid Sterba <>
parent e02d48ea
......@@ -395,10 +395,31 @@ static noinline int add_async_extent(struct async_chunk *cow,
return 0;
* Check if the inode has flags compatible with compression
static inline bool inode_can_compress(struct inode *inode)
if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW ||
return false;
return true;
* Check if the inode needs to be submitted to compression, based on mount
* options, defragmentation, properties or heuristics.
static inline int inode_need_compress(struct inode *inode, u64 start, u64 end)
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
if (!inode_can_compress(inode)) {
KERN_ERR "BTRFS: unexpected compression for ino %llu\n",
return 0;
/* force compress */
if (btrfs_test_opt(fs_info, FORCE_COMPRESS))
return 1;
......@@ -1631,7 +1652,8 @@ int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page,
} else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC && !force_cow) {
ret = run_delalloc_nocow(inode, locked_page, start, end,
page_started, 0, nr_written);
} else if (!inode_need_compress(inode, start, end)) {
} else if (!inode_can_compress(inode) ||
!inode_need_compress(inode, start, end)) {
ret = cow_file_range(inode, locked_page, start, end, end,
page_started, nr_written, 1, NULL);
} else {
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