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btrfs: separate defrag and property compression

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Add new value for compression to distinguish between defrag and
property. Previously, a single variable was used and this caused clashes
when the per-file 'compression' was set and a defrag -c was called.

The property-compression is loaded when the file is open, defrag will
overwrite the same variable and reset to 0 (ie. NONE) at when the file
defragmentaion is finished. That's considered a usability bug.

Now we won't touch the property value, use the defrag-compression. The
precedence of defrag is higher than for property (and whole-filesystem).

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-07-17 19:41:31 +02:00
parent b52aa8c93e
commit eec63c65dc
3 changed files with 14 additions and 3 deletions
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5
fs/btrfs/btrfs_inode.h
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@ -182,6 +182,11 @@ struct btrfs_inode {
* Cached values of inode properties
*/
unsigned prop_compress; /* per-file compression algorithm */
/*
* Force compression on the file using the defrag ioctl, could be
* different from prop_compress and takes precedence if set
*/
unsigned defrag_compress;
struct btrfs_delayed_node *delayed_node;