From: Leon Romanovsky <[email protected]>

Move function declaration to shared header file to fix multiple 
-Wmissing-prototypes
warnings like below:

fs/btrfs/zstd.c:369:5: warning: no previous prototype for ‘zstd_compress_pages’ 
[-Wmissing-prototypes]
  369 | int zstd_compress_pages(struct list_head *ws, struct address_space 
*mapping,
      |     ^~~~~~~~~~~~~~~~~~~

Signed-off-by: Leon Romanovsky <[email protected]>
---
 fs/btrfs/compression.c | 35 -----------------------------------
 fs/btrfs/compression.h | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 1ab56a734e70..eeface30facd 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -29,41 +29,6 @@
 #include "extent_io.h"
 #include "extent_map.h"

-int zlib_compress_pages(struct list_head *ws, struct address_space *mapping,
-               u64 start, struct page **pages, unsigned long *out_pages,
-               unsigned long *total_in, unsigned long *total_out);
-int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
-int zlib_decompress(struct list_head *ws, unsigned char *data_in,
-               struct page *dest_page, unsigned long start_byte, size_t srclen,
-               size_t destlen);
-struct list_head *zlib_alloc_workspace(unsigned int level);
-void zlib_free_workspace(struct list_head *ws);
-struct list_head *zlib_get_workspace(unsigned int level);
-
-int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
-               u64 start, struct page **pages, unsigned long *out_pages,
-               unsigned long *total_in, unsigned long *total_out);
-int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
-int lzo_decompress(struct list_head *ws, unsigned char *data_in,
-               struct page *dest_page, unsigned long start_byte, size_t srclen,
-               size_t destlen);
-struct list_head *lzo_alloc_workspace(unsigned int level);
-void lzo_free_workspace(struct list_head *ws);
-
-int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
-               u64 start, struct page **pages, unsigned long *out_pages,
-               unsigned long *total_in, unsigned long *total_out);
-int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
-int zstd_decompress(struct list_head *ws, unsigned char *data_in,
-               struct page *dest_page, unsigned long start_byte, size_t srclen,
-               size_t destlen);
-void zstd_init_workspace_manager(void);
-void zstd_cleanup_workspace_manager(void);
-struct list_head *zstd_alloc_workspace(unsigned int level);
-void zstd_free_workspace(struct list_head *ws);
-struct list_head *zstd_get_workspace(unsigned int level);
-void zstd_put_workspace(struct list_head *ws);
-
 static const char* const btrfs_compress_types[] = { "", "zlib", "lzo", "zstd" 
};

 const char* btrfs_compress_type2str(enum btrfs_compression_type type)
diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
index 9f3dbe372631..8001b700ea3a 100644
--- a/fs/btrfs/compression.h
+++ b/fs/btrfs/compression.h
@@ -144,4 +144,39 @@ bool btrfs_compress_is_valid_type(const char *str, size_t 
len);

 int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end);

+int zlib_compress_pages(struct list_head *ws, struct address_space *mapping,
+               u64 start, struct page **pages, unsigned long *out_pages,
+               unsigned long *total_in, unsigned long *total_out);
+int zlib_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
+int zlib_decompress(struct list_head *ws, unsigned char *data_in,
+               struct page *dest_page, unsigned long start_byte, size_t srclen,
+               size_t destlen);
+struct list_head *zlib_alloc_workspace(unsigned int level);
+void zlib_free_workspace(struct list_head *ws);
+struct list_head *zlib_get_workspace(unsigned int level);
+
+int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
+               u64 start, struct page **pages, unsigned long *out_pages,
+               unsigned long *total_in, unsigned long *total_out);
+int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
+int lzo_decompress(struct list_head *ws, unsigned char *data_in,
+               struct page *dest_page, unsigned long start_byte, size_t srclen,
+               size_t destlen);
+struct list_head *lzo_alloc_workspace(unsigned int level);
+void lzo_free_workspace(struct list_head *ws);
+
+int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
+               u64 start, struct page **pages, unsigned long *out_pages,
+               unsigned long *total_in, unsigned long *total_out);
+int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
+int zstd_decompress(struct list_head *ws, unsigned char *data_in,
+               struct page *dest_page, unsigned long start_byte, size_t srclen,
+               size_t destlen);
+void zstd_init_workspace_manager(void);
+void zstd_cleanup_workspace_manager(void);
+struct list_head *zstd_alloc_workspace(unsigned int level);
+void zstd_free_workspace(struct list_head *ws);
+struct list_head *zstd_get_workspace(unsigned int level);
+void zstd_put_workspace(struct list_head *ws);
+
 #endif
--
2.26.2

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