staging: lustre: llite: cache directory striping information

Cache directory striping information that the clients receive
from the metadata servers.
Signed-off-by: wang di <di.wang@intel.com>
Reviewed-on: http://review.whamcloud.com/7043
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3531Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/llite/llite_internal.h

@@ -173,6 +173,8 @@ struct ll_inode_info {
 			 * -- I am the owner of dir statahead.
 			 */
 			pid_t			   d_opendir_pid;
+			/* directory stripe information */
+			struct lmv_stripe_md		*d_lmv_md;
 		} d;
 
 #define lli_readdir_mutex       u.d.d_readdir_mutex
@@ -180,6 +182,7 @@ struct ll_inode_info {
 #define lli_sai		 u.d.d_sai
 #define lli_sa_lock	     u.d.d_sa_lock
 #define lli_opendir_pid	 u.d.d_opendir_pid
+#define lli_lmv_md		u.d.d_lmv_md
 
 		/* for non-directory */
 		struct {

drivers/staging/lustre/lustre/llite/llite_lib.c

@@ -2090,11 +2090,22 @@ struct md_op_data *ll_prep_md_op_data(struct md_op_data *op_data,
 
 	ll_i2gids(op_data->op_suppgids, i1, i2);
 	op_data->op_fid1 = *ll_inode2fid(i1);
+	if (S_ISDIR(i1->i_mode))
+		op_data->op_mea1 = ll_i2info(i1)->lli_lmv_md;
 
-	if (i2)
+	if (i2) {
 		op_data->op_fid2 = *ll_inode2fid(i2);
-	else
+		if (S_ISDIR(i2->i_mode))
+			op_data->op_mea2 = ll_i2info(i2)->lli_lmv_md;
+	} else {
 		fid_zero(&op_data->op_fid2);
+	}
+
+	if (ll_i2sbi(i1)->ll_flags & LL_SBI_64BIT_HASH)
+		op_data->op_cli_flags |= CLI_HASH64;
+
+	if (ll_need_32bit_api(ll_i2sbi(i1)))
+		op_data->op_cli_flags |= CLI_API32;
 
 	op_data->op_name = name;
 	op_data->op_namelen = namelen;