[PATCH] generic/020: fix really long attr test failure for ceph

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From: Xiubo Li <xiubli@xxxxxxxxxx>

If the CONFIG_CEPH_FS_SECURITY_LABEL is enabled the kernel ceph
itself will set the security.selinux extended attribute to MDS.
And it will also eat some space of the total size.

Fixes: https://tracker.ceph.com/issues/58742
Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx>
---
 tests/generic/020 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/generic/020 b/tests/generic/020
index be5cecad..594535b5 100755
--- a/tests/generic/020
+++ b/tests/generic/020
@@ -150,9 +150,11 @@ _attr_get_maxval_size()
 		# it imposes a maximum size for the full set of xattrs
 		# names+values, which by default is 64K.  Compute the maximum
 		# taking into account the already existing attributes
-		max_attrval_size=$(getfattr --dump -e hex $filename 2>/dev/null | \
+		size=$(getfattr --dump -e hex $filename 2>/dev/null | \
 			awk -F "=0x" '/^user/ {len += length($1) + length($2) / 2} END {print len}')
-		max_attrval_size=$((65536 - $max_attrval_size - $max_attrval_namelen))
+		selinux_size=$(getfattr -n 'security.selinux' --dump -e hex $filename 2>/dev/null | \
+			awk -F "=0x" '/^security/ {len += length($1) + length($2) / 2} END {print len}')
+		max_attrval_size=$((65536 - $size - $selinux_size - $max_attrval_namelen))
 		;;
 	*)
 		# Assume max ~1 block of attrs
-- 
2.31.1




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