[PATCH] block: allow zone_mgmt_ops to bail out on SIGKILL

[Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>]

This patch is on the similar concept which is posted earlier:-
https://marc.info/?l=linux-block&m=157321402002207&w=2.

This allows zone-mgmt ops to handle SIGKILL.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---

In case someone is interested here is the test on null blk with
added prints for zoneid.

Without this patch :-

# blkzone reset -o 0 -c 1000 /dev/nullb0 
^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C

[  174.115065] null_blk: null_zone_mgmt 163 zoneid 993
[  174.125071] null_blk: null_zone_mgmt 163 zoneid 994
[  174.135076] null_blk: null_zone_mgmt 163 zoneid 995
[  174.145082] null_blk: null_zone_mgmt 163 zoneid 996
[  174.155087] null_blk: null_zone_mgmt 163 zoneid 997
[  174.165091] null_blk: null_zone_mgmt 163 zoneid 998
[  174.175096] null_blk: null_zone_mgmt 163 zoneid 999

With this patch :-
 # blkzone reset -o 0 -c 1000 /dev/nullb0
^C

[  211.889379] null_blk: null_zone_mgmt 163 zoneid 191
[  211.899420] null_blk: null_zone_mgmt 163 zoneid 192
[  211.909424] null_blk: null_zone_mgmt 163 zoneid 193

---
 block/blk-zoned.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 481eaf7d04d4..07ff2b75e6d7 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -17,6 +17,7 @@
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/sched/mm.h>
+#include <linux/sched/signal.h>
 
 #include "blk.h"
 
@@ -287,6 +288,8 @@ int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
 
 		/* This may take a while, so be nice to others */
 		cond_resched();
+		if (fatal_signal_pending(current))
+			break;
 	}
 
 	ret = submit_bio_wait(bio);
-- 
2.22.1