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Subject[PATCH 4.9 124/144] staging: lustre: llite: correct removexattr detection
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Simmons <jsimmons@infradead.org>

[ Upstream commit 1b60f6dfa38403ff7c4d0b4b7ecdb810f9789a2a ]

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.hammond@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-10787
Reviewed-on: https://review.whamcloud.com/
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/lustre/lustre/llite/xattr.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/staging/lustre/lustre/llite/xattr.c
+++ b/drivers/staging/lustre/lustre/llite/xattr.c
@@ -103,7 +103,11 @@ ll_xattr_set_common(const struct xattr_h
__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 {

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