staging: lustre: llite: handle inactive OSTs better in statfs

Change the order of checks for inactive OSCs in lov_prep_statfs_set()
so that administratively disabled OSTs do not generate any output in
"lfs df" at all, to avoid needlessly cluttering the output.

Enable the lazystatfs mount option by default, so that "df" does not
hang when an OST is temporarily offline.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7759
Reviewed-on: http://review.whamcloud.com/19195
Reviewed-by: John L. Hammond <john.hammond@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>

2 files changed, 4 insertions, 3 deletions

diff --git a/drivers/staging/lustre/lustre/llite/llite_lib.c b/drivers/staging/lustre/lustre/llite/llite_lib.c
index 769b307b8334..0a87058bb691 100644
--- a/drivers/staging/lustre/lustre/llite/llite_lib.c
+++ b/drivers/staging/lustre/lustre/llite/llite_lib.c
@@ -103,6 +103,7 @@ static struct ll_sb_info *ll_init_sbi(struct super_block *sb)
         sbi->ll_flags |= LL_SBI_CHECKSUM;
 
         sbi->ll_flags |= LL_SBI_LRU_RESIZE;
+        sbi->ll_flags |= LL_SBI_LAZYSTATFS;
 
         for (i = 0; i <= LL_PROCESS_HIST_MAX; i++) {
                 spin_lock_init(&sbi->ll_rw_extents_info.pp_extents[i].
diff --git a/drivers/staging/lustre/lustre/lov/lov_request.c b/drivers/staging/lustre/lustre/lov/lov_request.c
index d43cc88ae641..3a747913fb4f 100644
--- a/drivers/staging/lustre/lustre/lov/lov_request.c
+++ b/drivers/staging/lustre/lustre/lov/lov_request.c
@@ -344,9 +344,6 @@ int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
                         continue;
                 }
 
-                if (!lov->lov_tgts[i]->ltd_active)
-                        lov_check_and_wait_active(lov, i);
-
                 /* skip targets that have been explicitly disabled by the
                  * administrator
                  */
@@ -355,6 +352,9 @@ int lov_prep_statfs_set(struct obd_device *obd, struct obd_info *oinfo,
                         continue;
                 }
 
+                if (!lov->lov_tgts[i]->ltd_active)
+                        lov_check_and_wait_active(lov, i);
+
                 req = kzalloc(sizeof(*req), GFP_NOFS);
                 if (!req) {
                         rc = -ENOMEM;