Illumos 5746 - more checksumming in zfs send

5746 more checksumming in zfs send
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Bayard Bell <buffer.g.overflow@gmail.com>
Approved by: Albert Lee <trisk@omniti.com>

References:
  https://www.illumos.org/issues/5746
  https://github.com/illumos/illumos-gate/commit/98110f0
  https://github.com/zfsonlinux/zfs/issues/905

Porting notes:
- Minor conflicts due to:
  - https://github.com/zfsonlinux/zfs/commit/2024041
  - https://github.com/zfsonlinux/zfs/commit/044baf0
  - https://github.com/zfsonlinux/zfs/commit/88904bb
- Fix ISO C90 warnings (-Werror=declaration-after-statement)
  - arc_buf_t *abuf;
  - dmu_buf_t *bonus;
  - zio_cksum_t cksum_orig;
  - zio_cksum_t *cksump;
- Fix format '%llx' format specifier warning
- Align message in zstreamdump safe_malloc() with upstream

Ported-by: kernelOfTruth kerneloftruth@gmail.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3611

include/sys/spa.h

@@ -446,6 +446,19 @@ _NOTE(CONSTCOND) } while (0)
 	((zc1).zc_word[2] - (zc2).zc_word[2]) | \
 	((zc1).zc_word[3] - (zc2).zc_word[3])))
 
+#define	ZIO_CHECKSUM_IS_ZERO(zc) \
+	(0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
+	(zc)->zc_word[2] | (zc)->zc_word[3]))
+
+#define	ZIO_CHECKSUM_BSWAP(zcp)					\
+{								\
+	(zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]);	\
+	(zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]);	\
+	(zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]);	\
+	(zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]);	\
+}
+
+
 #define	DVA_IS_VALID(dva)	(DVA_GET_ASIZE(dva) != 0)
 
 #define	ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3)	\

include/sys/zfs_ioctl.h

@@ -20,7 +20,7 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2013 by Delphix. All rights reserved.
+ * Copyright (c) 2012, 2014 by Delphix. All rights reserved.
  */
 
 #ifndef	_SYS_ZFS_IOCTL_H
@@ -237,6 +237,22 @@ typedef struct dmu_replay_record {
 			uint32_t drr_psize; /* compr. (real) size of payload */
 			/* (possibly compressed) content follows */
 		} drr_write_embedded;
+
+		/*
+		 * Nore: drr_checksum is overlaid with all record types
+		 * except DRR_BEGIN.  Therefore its (non-pad) members
+		 * must not overlap with members from the other structs.
+		 * We accomplish this by putting its members at the very
+		 * end of the struct.
+		 */
+		struct drr_checksum {
+			uint64_t drr_pad[34];
+			/*
+			 * fletcher-4 checksum of everything preceding the
+			 * checksum.
+			 */
+			zio_cksum_t drr_checksum;
+		} drr_checksum;
 	} drr_u;
 } dmu_replay_record_t;
 

include/sys/zio_checksum.h

@@ -20,6 +20,7 @@
  */
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014 by Delphix. All rights reserved.
  */
 
 #ifndef _SYS_ZIO_CHECKSUM_H
@@ -34,13 +35,13 @@ extern "C" {
 /*
  * Signature for checksum functions.
  */
-typedef void zio_checksum_t(const void *data, uint64_t size, zio_cksum_t *zcp);
+typedef void zio_checksum_func_t(const void *, uint64_t, zio_cksum_t *);
 
 /*
  * Information about each checksum function.
  */
 typedef const struct zio_checksum_info {
-	zio_checksum_t	*ci_func[2]; /* checksum function for each byteorder */
+	zio_checksum_func_t *ci_func[2]; /* checksum function per byteorder */
 	int		ci_correctable;	/* number of correctable bits	*/
 	int		ci_eck;		/* uses zio embedded checksum? */
 	int		ci_dedup;	/* strong enough for dedup? */
@@ -61,7 +62,7 @@ extern zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS];
 /*
  * Checksum routines.
  */
-extern zio_checksum_t zio_checksum_SHA256;
+extern zio_checksum_func_t zio_checksum_SHA256;
 
 extern void zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
     void *data, uint64_t size);