btrfs: add an fs_info parameter for compression workspace manager

[BACKGROUND]
Currently btrfs shares workspaces and their managers for all filesystems,
this is mostly fine as all those workspaces are using page size based
buffers, and btrfs only support block size (bs) <= page size (ps).

This means even if bs < ps, we at most waste some buffer space in the
workspace, but everything will still work fine.

The problem here is that is limiting our support for bs > ps cases.

As now a workspace now may need larger buffer to handle bs > ps cases,
but since the pool has no way to distinguish different workspaces, a
regular workspace (which is still using buffer size based on ps) can be
passed to a btrfs whose bs > ps.

In that case the buffer is not large enough, and will cause various
problems.

[ENHANCEMENT]
To prepare for the per-fs workspace migration, add an fs_info parameter
to all workspace related functions.

For now this new fs_info parameter is not yet utilized.

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, 14 insertions, 9 deletions

diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index e7282fb7c13b..f600555b7583 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -75,6 +75,11 @@ struct compressed_bio {
 	struct btrfs_bio bbio;
 };
 
+static inline struct btrfs_fs_info *cb_to_fs_info(const struct compressed_bio *cb)
+{
+	return cb->bbio.fs_info;
+}
+
 /* @range_end must be exclusive. */
 static inline u32 btrfs_calc_input_length(struct folio *folio, u64 range_end, u64 cur)
 {
@@ -128,8 +133,8 @@ struct workspace_manager {
 	wait_queue_head_t ws_wait;
 };
 
-struct list_head *btrfs_get_workspace(int type, int level);
-void btrfs_put_workspace(int type, struct list_head *ws);
+struct list_head *btrfs_get_workspace(struct btrfs_fs_info *fs_info, int type, int level);
+void btrfs_put_workspace(struct btrfs_fs_info *fs_info, int type, struct list_head *ws);
 
 struct btrfs_compress_op {
 	struct workspace_manager *workspace_manager;
@@ -162,9 +167,9 @@ int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
 int zlib_decompress(struct list_head *ws, const u8 *data_in,
 		struct folio *dest_folio, unsigned long dest_pgoff, size_t srclen,
 		size_t destlen);
-struct list_head *zlib_alloc_workspace(unsigned int level);
+struct list_head *zlib_alloc_workspace(struct btrfs_fs_info *fs_info, unsigned int level);
 void zlib_free_workspace(struct list_head *ws);
-struct list_head *zlib_get_workspace(unsigned int level);
+struct list_head *zlib_get_workspace(struct btrfs_fs_info *fs_info, unsigned int level);
 
 int lzo_compress_folios(struct list_head *ws, struct btrfs_inode *inode,
 			u64 start, struct folio **folios, unsigned long *out_folios,
@@ -173,7 +178,7 @@ int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
 int lzo_decompress(struct list_head *ws, const u8 *data_in,
 		struct folio *dest_folio, unsigned long dest_pgoff, size_t srclen,
 		size_t destlen);
-struct list_head *lzo_alloc_workspace(void);
+struct list_head *lzo_alloc_workspace(struct btrfs_fs_info *fs_info);
 void lzo_free_workspace(struct list_head *ws);
 
 int zstd_compress_folios(struct list_head *ws, struct btrfs_inode *inode,
@@ -183,11 +188,11 @@ 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);
-void zstd_init_workspace_manager(void);
+void zstd_init_workspace_manager(struct btrfs_fs_info *fs_info);
 void zstd_cleanup_workspace_manager(void);
-struct list_head *zstd_alloc_workspace(int level);
+struct list_head *zstd_alloc_workspace(struct btrfs_fs_info *fs_info, int level);
 void zstd_free_workspace(struct list_head *ws);
-struct list_head *zstd_get_workspace(int level);
-void zstd_put_workspace(struct list_head *ws);
+struct list_head *zstd_get_workspace(struct btrfs_fs_info *fs_info, int level);
+void zstd_put_workspace(struct btrfs_fs_info *fs_info, struct list_head *ws);
 
 #endif