MFV r274273:

ZFS large block support.

Please note that booting from datasets that have recordsize greater
than 128KB is not supported (but it's Okay to enable the feature on
the pool).  This *may* remain unchanged because of memory constraint.

Limited safety belt is provided for mounted root filesystem but use
caution is advised.

Illumos issue:
    5027 zfs large block support

MFC after:	1 month

1 files changed, 43 insertions, 5 deletions

diff --git a/cddl/contrib/opensolaris/cmd/zfs/zfs.8 b/cddl/contrib/opensolaris/cmd/zfs/zfs.8
index 2315e05..065497f 100644
--- a/cddl/contrib/opensolaris/cmd/zfs/zfs.8
+++ b/cddl/contrib/opensolaris/cmd/zfs/zfs.8
@@ -30,7 +30,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 30, 2014
+.Dd November 10, 2014
 .Dt ZFS 8
 .Os
 .Sh NAME
@@ -179,12 +179,12 @@
 .Ar bookmark
 .Nm
 .Cm send
-.Op Fl DnPpRve
+.Op Fl DnPpRveL
 .Op Fl i Ar snapshot | Fl I Ar snapshot
 .Ar snapshot
 .Nm
 .Cm send
-.Op Fl e
+.Op Fl eL
 .Op Fl i Ar snapshot Ns | Ns bookmark
 .Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot
 .Nm
@@ -1187,6 +1187,12 @@ systems is strongly discouraged, and may adversely affect performance.
 .Pp
 The size specified must be a power of two greater than or equal to 512 and less
 than or equal to 128 Kbytes.
+If the
+.Sy large_blocks
+feature is enabled on the pool, the size may be up to 1 Mbyte.
+See
+.Xr zpool-features 7
+for details on ZFS feature flags.
 .Pp
 Changing the file system's
 .Sy recordsize
@@ -2477,7 +2483,7 @@ feature.
 .It Xo
 .Nm
 .Cm send
-.Op Fl DnPpRve
+.Op Fl DnPpRveL
 .Op Fl i Ar snapshot | Fl I Ar snapshot
 .Ar snapshot
 .Xc
@@ -2549,6 +2555,22 @@ be used regardless of the dataset's
 property, but performance will be much better if the filesystem uses a
 dedup-capable checksum (eg.
 .Sy sha256 ) .
+.It Fl L
+Generate a stream which may contain blocks larger than 128KB.
+This flag
+has no effect if the
+.Sy large_blocks
+pool feature is disabled, or if the
+.Sy recordsize
+property of this filesystem has never been set above 128KB.
+The receiving system must have the
+.Sy large_blocks
+pool feature enabled as well.
+See
+.Xr zpool-features 7
+for details on ZFS feature flags and the
+.Sy large_blocks
+feature.
 .It Fl e
 Generate a more compact stream by using WRITE_EMBEDDED records for blocks
 which are stored more compactly on disk by the
@@ -2596,7 +2618,7 @@ on future versions of
 .It Xo
 .Nm
 .Cm send
-.Op Fl e
+.Op Fl eL
 .Op Fl i Ar snapshot Ns | Ns Ar bookmark
 .Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot
 .Xc
@@ -2622,6 +2644,22 @@ specified as the last component of the name
 If the incremental target is a clone, the incremental source can
 be the origin snapshot, or an earlier snapshot in the origin's filesystem,
 or the origin's origin, etc.
+.It Fl L
+Generate a stream which may contain blocks larger than 128KB.
+This flag
+has no effect if the
+.Sy large_blocks
+pool feature is disabled, or if the
+.Sy recordsize
+property of this filesystem has never been set above 128KB.
+The receiving system must have the
+.Sy large_blocks
+pool feature enabled as well.
+See
+.Xr zpool-features 7
+for details on ZFS feature flags and the
+.Sy large_blocks
+feature.
 .It Fl e
 Generate a more compact stream by using WRITE_EMBEDDED records for blocks
 which are stored more compactly on disk by the