ceph: use correct index when encoding client supported features

Feature bits have to be encoded into the correct locations.  This hasn't
been an issue so far because the only hole in the feature bits was in bit
10 (CEPHFS_FEATURE_RECLAIM_CLIENT), which is located in the 2nd byte.  When
adding more bits that go beyond the this 2nd byte, the bug will show up.

[xiubli: remove incorrect comment for CEPHFS_FEATURES_CLIENT_SUPPORTED]

Fixes: 9ba1e224538a ("ceph: allocate the correct amount of extra bytes for the session features")
Signed-off-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 33f517d..0aded10 100644 (file)
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1220,14 +1220,17 @@ static int encode_supported_features(void **p, void *end)
        if (count > 0) {
                size_t i;
                size_t size = FEATURE_BYTES(count);
+               unsigned long bit;
 
                if (WARN_ON_ONCE(*p + 4 + size > end))
                        return -ERANGE;
 
                ceph_encode_32(p, size);
                memset(*p, 0, size);
-               for (i = 0; i < count; i++)
-                       ((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
+               for (i = 0; i < count; i++) {
+                       bit = feature_bits[i];
+                       ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8);
+               }
                *p += size;
        } else {
                if (WARN_ON_ONCE(*p + 4 > end))

diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 1140aec..2a49e33 100644 (file)
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -33,10 +33,6 @@ enum ceph_feature_type {
        CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_METRIC_COLLECT,
 };
 
-/*
- * This will always have the highest feature bit value
- * as the last element of the array.
- */
 #define CEPHFS_FEATURES_CLIENT_SUPPORTED {     \
        0, 1, 2, 3, 4, 5, 6, 7,                 \
        CEPHFS_FEATURE_MIMIC,                   \
@@ -45,8 +41,6 @@ enum ceph_feature_type {
        CEPHFS_FEATURE_MULTI_RECONNECT,         \
        CEPHFS_FEATURE_DELEG_INO,               \
        CEPHFS_FEATURE_METRIC_COLLECT,          \
-                                               \
-       CEPHFS_FEATURE_MAX,                     \
 }
 #define CEPHFS_FEATURES_CLIENT_REQUIRED {}