[PATCH v2 5/9] btrfs: zstd: Switch to the zstd-1.4.6 API

[Nick Terrell <nickrterrell@gmail.com>]

From: Nick Terrell <terrelln@fb.com>

Move away from the compatibility wrapper to the zstd-1.4.6 API. This
code is functionally equivalent.

Signed-off-by: Nick Terrell <terrelln@fb.com>
---
 fs/btrfs/zstd.c | 48 ++++++++++++++++++++++++++++--------------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/fs/btrfs/zstd.c b/fs/btrfs/zstd.c
index a7367ff573d4..6b466e090cd7 100644
--- a/fs/btrfs/zstd.c
+++ b/fs/btrfs/zstd.c
@@ -16,7 +16,7 @@
 #include <linux/refcount.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
-#include <linux/zstd_compat.h>
+#include <linux/zstd.h>
 #include "misc.h"
 #include "compression.h"
 #include "ctree.h"
@@ -159,8 +159,8 @@ static void zstd_calc_ws_mem_sizes(void)
 			zstd_get_btrfs_parameters(level, ZSTD_BTRFS_MAX_INPUT);
 		size_t level_size =
 			max_t(size_t,
-			      ZSTD_CStreamWorkspaceBound(params.cParams),
-			      ZSTD_DStreamWorkspaceBound(ZSTD_BTRFS_MAX_INPUT));
+			      ZSTD_estimateCStreamSize_usingCParams(params.cParams),
+			      ZSTD_estimateDStreamSize(ZSTD_BTRFS_MAX_INPUT));
 
 		max_size = max_t(size_t, max_size, level_size);
 		zstd_ws_mem_sizes[level - 1] = max_size;
@@ -389,13 +389,23 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
 	*total_in = 0;
 
 	/* Initialize the stream */
-	stream = ZSTD_initCStream(params, len, workspace->mem,
-			workspace->size);
+	stream = ZSTD_initStaticCStream(workspace->mem, workspace->size);
 	if (!stream) {
-		pr_warn("BTRFS: ZSTD_initCStream failed\n");
+		pr_warn("BTRFS: ZSTD_initStaticCStream failed\n");
 		ret = -EIO;
 		goto out;
 	}
+	{
+		size_t ret2;
+
+		ret2 = ZSTD_initCStream_advanced(stream, NULL, 0, params, len);
+		if (ZSTD_isError(ret2)) {
+			pr_warn("BTRFS: ZSTD_initCStream_advanced returned %s\n",
+					ZSTD_getErrorName(ret2));
+			ret = -EIO;
+			goto out;
+		}
+	}
 
 	/* map in the first page of input data */
 	in_page = find_get_page(mapping, start >> PAGE_SHIFT);
@@ -421,8 +431,8 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
 		ret2 = ZSTD_compressStream(stream, &workspace->out_buf,
 				&workspace->in_buf);
 		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_compressStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
+			pr_debug("BTRFS: ZSTD_compressStream returned %s\n",
+					ZSTD_getErrorName(ret2));
 			ret = -EIO;
 			goto out;
 		}
@@ -489,8 +499,8 @@ int zstd_compress_pages(struct list_head *ws, struct address_space *mapping,
 
 		ret2 = ZSTD_endStream(stream, &workspace->out_buf);
 		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_endStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
+			pr_debug("BTRFS: ZSTD_endStream returned %s\n",
+					ZSTD_getErrorName(ret2));
 			ret = -EIO;
 			goto out;
 		}
@@ -557,10 +567,9 @@ int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
 	unsigned long buf_start;
 	unsigned long total_out = 0;
 
-	stream = ZSTD_initDStream(
-			ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
+	stream = ZSTD_initStaticDStream(workspace->mem, workspace->size);
 	if (!stream) {
-		pr_debug("BTRFS: ZSTD_initDStream failed\n");
+		pr_debug("BTRFS: ZSTD_initStaticDStream failed\n");
 		ret = -EIO;
 		goto done;
 	}
@@ -579,8 +588,8 @@ int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
 		ret2 = ZSTD_decompressStream(stream, &workspace->out_buf,
 				&workspace->in_buf);
 		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
+			pr_debug("BTRFS: ZSTD_decompressStream returned %s\n",
+					ZSTD_getErrorName(ret2));
 			ret = -EIO;
 			goto done;
 		}
@@ -633,10 +642,9 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
 	unsigned long pg_offset = 0;
 	char *kaddr;
 
-	stream = ZSTD_initDStream(
-			ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
+	stream = ZSTD_initStaticDStream(workspace->mem, workspace->size);
 	if (!stream) {
-		pr_warn("BTRFS: ZSTD_initDStream failed\n");
+		pr_warn("BTRFS: ZSTD_initStaticDStream failed\n");
 		ret = -EIO;
 		goto finish;
 	}
@@ -667,8 +675,8 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
 		ret2 = ZSTD_decompressStream(stream, &workspace->out_buf,
 				&workspace->in_buf);
 		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
+			pr_debug("BTRFS: ZSTD_decompressStream returned %s\n",
+					ZSTD_getErrorName(ret2));
 			ret = -EIO;
 			goto finish;
 		}
-- 
2.28.0