On Mon, May 14, 2018 at 11:46:09PM +0300, Timofey Titovets wrote:
> > > @@ -396,6 +396,14 @@ static inline int inode_need_compress(struct inode
> *inode, u64 start, u64 end)
> > > {
> > > struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
> > >
> > > + /*
> > > + * Btrfs doesn't support compression without csum or CoW.
> > > + * This should have the highest priority.
> > > + */
> > > + if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW ||
> > > + BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)
> > > + return 0;
>
> > This is also the wrong place to fix that, NODATASUM or NODATACOW inode
> > should never make it to compress_file_range (that calls
> > inode_need_compress).
>
>
> David, i've talk about that some time ago:
> https://www.spinics.net/lists/linux-btrfs/msg73137.html
>
> NoCow files can be *easy* compressed.
I missed your previous mail, the issue with compression and nocow/nosum
is there. Seems like some of the combinations are not properly handled
when it's mount option vs defrag.
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