From eaa8687be33318ae07d61a91e0069244b326f450 Mon Sep 17 00:00:00 2001
From: Brian Behlendorf <behlendorf1@llnl.gov>
Date: Thu, 26 Aug 2010 10:29:11 -0700
Subject: [PATCH] Fix zmod.h usage in userspace

Do not use zmod.h in userspace.

This has also been filed with the ZFS team. It makes the userspace
libzpool code use the zlib API, instead of the Solaris-only and
non-standard zmod.h.  The zlib API is almost identical and is a de
facto standard, so this is a no-brainer.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
---
 lib/libzpool/kernel.c | 26 --------------------------
 module/zfs/gzip.c     | 27 ++++++++++++++++++++-------
 2 files changed, 20 insertions(+), 33 deletions(-)

diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index adbe6ba..b64f03d 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -33,7 +33,6 @@
 #include <sys/stat.h>
 #include <sys/processor.h>
 #include <sys/zfs_context.h>
-#include <sys/zmod.h>
 #include <sys/utsname.h>
 #include <sys/systeminfo.h>
 
@@ -844,31 +843,6 @@ kernel_fini(void)
 	urandom_fd = -1;
 }
 
-int
-z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
-{
-	int ret;
-	uLongf len = *dstlen;
-
-	if ((ret = uncompress(dst, &len, src, srclen)) == Z_OK)
-		*dstlen = (size_t)len;
-
-	return (ret);
-}
-
-int
-z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
-    int level)
-{
-	int ret;
-	uLongf len = *dstlen;
-
-	if ((ret = compress2(dst, &len, src, srclen, level)) == Z_OK)
-		*dstlen = (size_t)len;
-
-	return (ret);
-}
-
 uid_t
 crgetuid(cred_t *cr)
 {
diff --git a/module/zfs/gzip.c b/module/zfs/gzip.c
index aa02548..155404e 100644
--- a/module/zfs/gzip.c
+++ b/module/zfs/gzip.c
@@ -28,22 +28,35 @@
 
 #include <sys/debug.h>
 #include <sys/types.h>
-#include <sys/zmod.h>
 
 #ifdef _KERNEL
+
 #include <sys/systm.h>
-#else
+#include <sys/zmod.h>
+
+typedef size_t zlen_t;
+#define compress_func   z_compress_level
+#define uncompress_func z_uncompress
+
+#else /* _KERNEL */
+
 #include <strings.h>
+#include <zlib.h>
+
+typedef uLongf zlen_t;
+#define compress_func   compress2
+#define uncompress_func uncompress
+
 #endif
 
 size_t
 gzip_compress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
 {
-	size_t dstlen = d_len;
+	zlen_t dstlen = d_len;
 
 	ASSERT(d_len <= s_len);
 
-	if (z_compress_level(d_start, &dstlen, s_start, s_len, n) != Z_OK) {
+	if (compress_func(d_start, &dstlen, s_start, s_len, n) != Z_OK) {
 		if (d_len != s_len)
 			return (s_len);
 
@@ -51,18 +64,18 @@ gzip_compress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
 		return (s_len);
 	}
 
-	return (dstlen);
+	return ((size_t) dstlen);
 }
 
 /*ARGSUSED*/
 int
 gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
 {
-	size_t dstlen = d_len;
+	zlen_t dstlen = d_len;
 
 	ASSERT(d_len >= s_len);
 
-	if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK)
+	if (uncompress_func(d_start, &dstlen, s_start, s_len) != Z_OK)
 		return (-1);
 
 	return (0);
-- 
1.8.3.1