In ll_xattr_set_common() detect the removexattr() case correctly by
testing for a NULL value as well as XATTR_REPLACE.

Signed-off-by: John L. Hammond <john.hamm...@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10787
Reviewed-on: https://review.whamcloud.com/
Reviewed-by: Dmitry Eremin <dmitry.ere...@intel.com>
Reviewed-by: James Simmons <uja.o...@yahoo.com>
Signed-off-by: James Simmons <jsimm...@infradead.org>
---
 drivers/staging/lustre/lustre/llite/xattr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/llite/xattr.c 
b/drivers/staging/lustre/lustre/llite/xattr.c
index e835c8e..1a597a6 100644
--- a/drivers/staging/lustre/lustre/llite/xattr.c
+++ b/drivers/staging/lustre/lustre/llite/xattr.c
@@ -94,7 +94,11 @@ static int ll_xattr_set_common(const struct xattr_handler 
*handler,
        u64 valid;
        int rc;
 
-       if (flags == XATTR_REPLACE) {
+       /* When setxattr() is called with a size of 0 the value is
+        * unconditionally replaced by "". When removexattr() is
+        * called we get a NULL value and XATTR_REPLACE for flags.
+        */
+       if (!value && flags == XATTR_REPLACE) {
                ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_REMOVEXATTR, 1);
                valid = OBD_MD_FLXATTRRM;
        } else {
-- 
1.8.3.1

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