kernel/fs/btrfs/compression.h, branch linux-5.1.y

btrfs: change set_level() to bound the level passed in

2019-02-25T13:13:32Z

Currently, the only user of set_level() is zlib which sets an internal workspace parameter. As level is now plumbed into get_workspace(), this can be handled there rather than separately. This repurposes set_level() to bound the level passed in so it can be used when setting the mounts compression level and as well as verifying the level before getting a workspace. The other benefit is this divides the meaning of compress(0) and get_workspace(0). The former means we want to use the default compression level of the compression type. The latter means we can use any workspace available. Signed-off-by: Dennis Zhou Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: plumb level through the compression interface

2019-02-25T13:13:32Z

Zlib compression supports multiple levels, but doesn't require changing in how a workspace itself is created and managed. Zstd introduces a different memory requirement such that higher levels of compression require more memory. This requires changes in how the alloc()/get() methods work for zstd. This pach plumbs compression level through the interface as a parameter in preparation for zstd compression levels. This gives the compression types opportunity to create/manage based on the compression level. Reviewed-by: Nikolay Borisov Reviewed-by: Josef Bacik Signed-off-by: Dennis Zhou Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: move to function pointers for get/put workspaces

2019-02-25T13:13:32Z

The previous patch added generic helpers for get_workspace() and put_workspace(). Now, we can migrate ownership of the workspace_manager to be in the compression type code as the compression code itself doesn't care beyond being able to get a workspace. The init/cleanup and get/put methods are abstracted so each compression algorithm can decide how they want to manage their workspaces. Reviewed-by: Josef Bacik Signed-off-by: Dennis Zhou Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: manage heuristic workspace as index 0

2019-02-25T13:13:31Z

While the heuristic workspaces aren't really compression workspaces, they use the same interface for managing them. So rather than branching, let's just handle them once again as the index 0 compression type. Reviewed-by: Nikolay Borisov Reviewed-by: Josef Bacik Signed-off-by: Dennis Zhou Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: add helpers for compression type and level

2019-02-25T13:13:30Z

It is very easy to miss places that rely on a certain bitshifting for decoding the type_level overloading. Add helpers to do this instead. Cc: Omar Sandoval Reviewed-by: Nikolay Borisov Reviewed-by: Josef Bacik Signed-off-by: Dennis Zhou Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: compression: Add linux/sizes.h for compression.h

2018-05-29T16:13:00Z

Since compression.h is using the SZ_* macros, and if some file includes only compression.h without linux/sizes.h, it will cause compile error. One example is lzo.c, if it uses BTRFS_MAX_COMPRESSED. Fix it by adding linux/sizes.h in compression.h Signed-off-by: Qu Wenruo Reviewed-by: Nikolay Borisov Signed-off-by: David Sterba

btrfs: replace GPL boilerplate by SPDX -- headers

2018-04-12T14:29:46Z

Remove GPL boilerplate text (long, short, one-line) and keep the rest, ie. personal, company or original source copyright statements. Add the SPDX header. Unify the include protection macros to match the file names. Signed-off-by: David Sterba

btrfs: add more __cold annotations

2018-03-26T13:09:39Z

The __cold functions are placed to a special section, as they're expected to be called rarely. This could help i-cache prefetches or help compiler to decide which branches are more/less likely to be taken without any other annotations needed. Though we can't add more __exit annotations, it's still possible to add __cold (that's also added with __exit). That way the following function categories are tagged: - printf wrappers, error messages - exit helpers Signed-off-by: David Sterba

btrfs: compression: add helper for type to string conversion

2018-01-22T15:08:16Z

There are several places opencoding this conversion, add a helper now that we have 3 compression algorithms. Signed-off-by: David Sterba

Btrfs: add __init macro to btrfs init functions

2018-01-22T15:08:11Z

Adding __init macro gives kernel a hint that this function is only used during the initialization phase and its memory resources can be freed up after. Signed-off-by: Liu Bo Reviewed-by: David Sterba Signed-off-by: David Sterba