btrfs: add workspace manager initialization for zstd

This involves:

- Add zstd_alloc_workspace_manager() and zstd_free_workspace_manager()
  Those two functions will accept an fs_info pointer, and alloc/free
  fs_info->compr_wsm[BTRFS_COMPRESS_ZSTD] pointer.

- Add btrfs_alloc_compress_wsm() and btrfs_free_compress_wsm()
  Those are helpers allocating the workspace managers for all
  algorithms.
  For now only zstd is supported, and the timing is a little unusual,
  the btrfs_alloc_compress_wsm() should only be called after the
  sectorsize being initialized.

  Meanwhile btrfs_free_fs_info_compress() is called in
  btrfs_free_fs_info().

- Move the definition of btrfs_compression_type to "fs.h"
  The reason is that "compression.h" has already included "fs.h", thus
  we can not just include "compression.h" to get the definition of
  BTRFS_NR_COMPRESS_TYPES to define fs_info::compr_wsm[].

For now the per-fs zstd workspace manager won't really have any effect,
and all compression is still going through the global workspace manager.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

1 files changed, 5 insertions, 10 deletions

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index f600555b7583..70a3294bd14a 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -89,6 +89,9 @@ static inline u32 btrfs_calc_input_length(struct folio *folio, u64 range_end, u6
 	return min(range_end, folio_end(folio)) - cur;
 }
 
+int btrfs_alloc_compress_wsm(struct btrfs_fs_info *fs_info);
+void btrfs_free_compress_wsm(struct btrfs_fs_info *fs_info);
+
 int __init btrfs_init_compress(void);
 void __cold btrfs_exit_compress(void);
 
@@ -112,16 +115,6 @@ int btrfs_compress_str2level(unsigned int type, const char *str, int *level_ret)
 struct folio *btrfs_alloc_compr_folio(void);
 void btrfs_free_compr_folio(struct folio *folio);
 
-enum btrfs_compression_type {
-	BTRFS_COMPRESS_NONE  = 0,
-	BTRFS_COMPRESS_ZLIB  = 1,
-	BTRFS_COMPRESS_LZO   = 2,
-	BTRFS_COMPRESS_ZSTD  = 3,
-	BTRFS_NR_COMPRESS_TYPES = 4,
-
-	BTRFS_DEFRAG_DONT_COMPRESS,
-};
-
 struct workspace_manager {
 	struct list_head idle_ws;
 	spinlock_t ws_lock;
@@ -188,6 +181,8 @@ int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
 int zstd_decompress(struct list_head *ws, const u8 *data_in,
 		struct folio *dest_folio, unsigned long dest_pgoff, size_t srclen,
 		size_t destlen);
+int zstd_alloc_workspace_manager(struct btrfs_fs_info *fs_info);
+void zstd_free_workspace_manager(struct btrfs_fs_info *fs_info);
 void zstd_init_workspace_manager(struct btrfs_fs_info *fs_info);
 void zstd_cleanup_workspace_manager(void);
 struct list_head *zstd_alloc_workspace(struct btrfs_fs_info *fs_info, int level);