zfs_setprop_error(): Handle errno value E2BIG.

This errno value is emitted by dsl_props_set_check() in
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dsl_prop.c, and
is used to mean that the property value is too long.  For the record,
the maximum length is ZAP_MAXVALUELEN, which is 8*1024 bytes.

Instead of claiming an unknown error (and abort()ing), provide
something more specific to the scenario involved.  As far as I
can tell, E2BIG is not emitted for any other scenario.

MFC after:	1 week
Sponsored by:	Spectra Logic
Affects:	All ZFS versions starting 27 Feb 2009 (illumos ccba0801)
		This change modified the value returned by
		dsl_props_set_check(), so that it can distinguish between
		a name that's too long and a value that's too long, but
		libzfs was not updated accordingly.
MFSpectraBSD:	r1051499 on 2014/03/28 11:07:59

1 files changed, 6 insertions, 0 deletions

diff --git a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
index d7126bf..265038a 100644
--- a/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
+++ b/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_dataset.c
@@ -1457,6 +1457,12 @@ zfs_setprop_error(libzfs_handle_t *hdl, zfs_prop_t prop, int err,
 		(void) zfs_error(hdl, EZFS_DSREADONLY, errbuf);
 		break;
 
+	case E2BIG:
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "property value too long"));
+		(void) zfs_error(hdl, EZFS_BADPROP, errbuf);
+		break;
+
 	case ENOTSUP:
 		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
 		    "pool and or dataset must be upgraded to set this "