[Devel] [PATCH RHEL7 COMMIT] ploop: Remove now unused PLOOP_REQ_ZERO branches

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-957.12.1.vz7.95.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-957.12.1.vz7.95.2
------>
commit 7782c0be0c18fe3b27984388cde50dfa04c07f4e
Author: Kirill Tkhai <ktkhai at virtuozzo.com>
Date:   Tue Apr 30 14:01:25 2019 +0300

    ploop: Remove now unused PLOOP_REQ_ZERO branches
    
    This flag is never set anymore, so the patch
    kills all unused branches under it.
    
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
    
    =====================
    Patchset description:
    
    ploop: Remove maintaince-mode-driven discard ioctls and leftovers
    
    ioctls are already disabled. This patchset finally kills
    them and dependent code.
    
    Kirill Tkhai (6):
          ploop: Remove obsolete ioctls
          ploop: Remove now unused PLOOP_REQ_ZERO branches
          ploop: Remove now unused PLOOP_REQ_DISCARD branches
          ploop: Remove now unused PLOOP_REQ_RELOC_S branches
          ploop: Remove now unused PLOOP_E_ZERO_INDEX and PLOOP_E_DELTA_ZERO_INDEX branches
          ploop: Remove unused leftover
---
 drivers/block/ploop/dev.c    |  5 +----
 drivers/block/ploop/events.h |  1 -
 drivers/block/ploop/map.c    | 19 +------------------
 include/linux/ploop/ploop.h  |  2 --
 4 files changed, 2 insertions(+), 25 deletions(-)

diff --git a/drivers/block/ploop/dev.c b/drivers/block/ploop/dev.c
index 27f4a5b24410..6fcd942004a1 100644
--- a/drivers/block/ploop/dev.c
+++ b/drivers/block/ploop/dev.c
@@ -244,8 +244,6 @@ void ploop_preq_drop(struct ploop_device * plo, struct list_head *drop_list)
 		put_beancounter(preq->preq_ub);
 		preq->preq_ub = NULL;
 #endif
-
-		BUG_ON (test_bit(PLOOP_REQ_ZERO, &preq->state));
 		ploop_test_and_clear_blockable(plo, preq);
 		drop_qlen++;
 	}
@@ -1776,8 +1774,7 @@ static inline bool preq_is_special(struct ploop_request * preq)
 			PLOOP_REQ_RELOC_A_FL |
 			PLOOP_REQ_RELOC_S_FL |
 			PLOOP_REQ_RELOC_N_FL |
-			PLOOP_REQ_DISCARD_FL |
-			PLOOP_REQ_ZERO_FL);
+			PLOOP_REQ_DISCARD_FL);
 }
 
 void ploop_add_req_to_fsync_queue(struct ploop_request * preq)
diff --git a/drivers/block/ploop/events.h b/drivers/block/ploop/events.h
index 62144e1b79d6..2db09d9ac34b 100644
--- a/drivers/block/ploop/events.h
+++ b/drivers/block/ploop/events.h
@@ -44,7 +44,6 @@
 			{ 1 << PLOOP_REQ_RELOC_A,	"RA"},	\
 			{ 1 << PLOOP_REQ_RELOC_S,	"RS"},	\
 			{ 1 << PLOOP_REQ_RELOC_N,	"RN"},	\
-			{ 1 << PLOOP_REQ_ZERO,		"Z"},	\
 			{ 1 << PLOOP_REQ_DISCARD,	"D"})
 
 #define PREQ_FORMAT "preq=0x%p cluster=0x%x iblock=0x%x size=0x%x eng_state=0x%lx state=%s rw=%s"
diff --git a/drivers/block/ploop/map.c b/drivers/block/ploop/map.c
index b8103cfcc79b..e03df205b0ab 100644
--- a/drivers/block/ploop/map.c
+++ b/drivers/block/ploop/map.c
@@ -913,14 +913,6 @@ void ploop_index_update(struct ploop_request * preq)
 		}
 	}
 
-	BUG_ON (test_bit(PLOOP_REQ_ZERO, &preq->state) && preq->iblock);
-	if (test_bit(PLOOP_REQ_ZERO, &preq->state) && !blk) {
-		printk("Either map_node is corrupted or bug in "
-		       "ploop-balloon (%u)\n", preq->req_cluster);
-		PLOOP_REQ_SET_ERROR(preq, -EIO);
-		goto corrupted;
-	}
-
 	if (blk == preq->iblock && top_delta->level == old_level)
 		goto out;
 
@@ -967,7 +959,6 @@ void ploop_index_update(struct ploop_request * preq)
 
 enomem:
 	PLOOP_REQ_SET_ERROR(preq, -ENOMEM);
-corrupted:
 	set_bit(PLOOP_S_ABORT, &plo->state);
 out:
 	preq->eng_state = PLOOP_E_COMPLETE;
@@ -1087,20 +1078,12 @@ static void map_wb_complete(struct map_node * m, int err)
 				struct ploop_request *pr = preq;
 				int do_levels_update = 0;
 
-				if (unlikely(test_bit(PLOOP_REQ_ZERO, &preq->state))) {
-					BUG_ON (list_empty(&preq->delay_list));
-					pr = list_first_entry(&preq->delay_list,
-							      struct ploop_request,
-							      list);
-				}
-
 				if (m->levels &&  m->levels[idx] != top_delta->level) {
 					spin_lock_irq(&plo->lock);
 					do_levels_update = 1;
 				}
 
-				if (unlikely(test_bit(PLOOP_REQ_RELOC_A, &preq->state) ||
-					     test_bit(PLOOP_REQ_ZERO, &preq->state)))
+				if (unlikely(test_bit(PLOOP_REQ_RELOC_A, &preq->state)))
 					map_idx_swap(m, idx, &pr->iblock,
 						     ploop_map_log(plo));
 				else
diff --git a/include/linux/ploop/ploop.h b/include/linux/ploop/ploop.h
index d37d1994434a..752da47e471e 100644
--- a/include/linux/ploop/ploop.h
+++ b/include/linux/ploop/ploop.h
@@ -491,7 +491,6 @@ enum
 	PLOOP_REQ_RELOC_A,	/* 'A' stands for allocate() */
 	PLOOP_REQ_RELOC_S,	/* Obsolete: 'S' stands for submit() */
 	PLOOP_REQ_RELOC_N,	/* 'N' stands for "nullify" */
-	PLOOP_REQ_ZERO,		/* Obsolete */
 	PLOOP_REQ_DISCARD,	/* Obsolete */
 	PLOOP_REQ_RSYNC,
 	PLOOP_REQ_KAIO_FSYNC,	/*force image fsync by KAIO module */
@@ -507,7 +506,6 @@ enum
 #define PLOOP_REQ_RELOC_S_FL (1 << PLOOP_REQ_RELOC_S) /* Obsolete */
 #define PLOOP_REQ_RELOC_N_FL (1 << PLOOP_REQ_RELOC_N)
 #define PLOOP_REQ_DISCARD_FL (1 << PLOOP_REQ_DISCARD)	/* Obsolete */
-#define PLOOP_REQ_ZERO_FL (1 << PLOOP_REQ_ZERO)		/* Obsolete */
 
 enum
 {