LU-12193 quota: use rw_sem to protect lqs_hash

[fs/lustre-release.git] / libcfs / include / libcfs / libcfs_hash.h

diff --git a/libcfs/include/libcfs/libcfs_hash.h b/libcfs/include/libcfs/libcfs_hash.h
index bd3d7d0..b541fe3 100644 (file)
--- a/libcfs/include/libcfs/libcfs_hash.h
+++ b/libcfs/include/libcfs/libcfs_hash.h
@@ -74,6 +74,7 @@ struct cfs_hash_hlist_ops;
 union cfs_hash_lock {
        rwlock_t                rw;             /**< rwlock */
        spinlock_t              spin;           /**< spinlock */
+       struct rw_semaphore     rw_sem;         /**< rwsem */
 };
 
 /**
@@ -155,6 +156,8 @@ enum cfs_hash_tag {
          * change on hash table is non-blocking
          */
         CFS_HASH_NBLK_CHANGE    = 1 << 13,
+       /** rw semaphore lock to protect bucket */
+       CFS_HASH_RW_SEM_BKTLOCK = 1 << 14,
         /** NB, we typed hs_flags as  __u16, please change it
          * if you need to extend >=16 flags */
 };
@@ -360,6 +363,13 @@ cfs_hash_with_spin_bktlock(struct cfs_hash *hs)
 }
 
 static inline int
+cfs_hash_with_rw_sem_bktlock(struct cfs_hash *hs)
+{
+       /* rw sem lock to protect hash bucket */
+       return (hs->hs_flags & CFS_HASH_RW_SEM_BKTLOCK) != 0;
+}
+
+static inline int
 cfs_hash_with_add_tail(struct cfs_hash *hs)
 {
         return (hs->hs_flags & CFS_HASH_ADD_TAIL) != 0;