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Subject[PATCH RFC 2/3] loop: Forward REQ_OP_ASSIGN_RANGE into fallocate(0)
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Date
Send fallocate(0) request into underlining filesystem
after upper filesystem sent REQ_OP_ASSIGN_RANGE request
to block device.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
---
drivers/block/loop.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 739b372a5112..d99d9193de7a 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -609,6 +609,8 @@ static int do_req_filebacked(struct loop_device *lo, struct request *rq)
FALLOC_FL_PUNCH_HOLE);
case REQ_OP_DISCARD:
return lo_fallocate(lo, rq, pos, FALLOC_FL_PUNCH_HOLE);
+ case REQ_OP_ASSIGN_RANGE:
+ return lo_fallocate(lo, rq, pos, 0);
case REQ_OP_WRITE:
if (lo->transfer)
return lo_write_transfer(lo, rq, pos);
@@ -875,6 +877,7 @@ static void loop_config_discard(struct loop_device *lo)
lo->lo_encrypt_key_size) {
q->limits.discard_granularity = 0;
q->limits.discard_alignment = 0;
+ q->limits.max_assign_range_sectors = 0;
blk_queue_max_discard_sectors(q, 0);
blk_queue_max_write_zeroes_sectors(q, 0);
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
@@ -883,6 +886,7 @@ static void loop_config_discard(struct loop_device *lo)

q->limits.discard_granularity = inode->i_sb->s_blocksize;
q->limits.discard_alignment = 0;
+ q->limits.max_assign_range_sectors = UINT_MAX >> 9;

blk_queue_max_discard_sectors(q, UINT_MAX >> 9);
blk_queue_max_write_zeroes_sectors(q, UINT_MAX >> 9);
@@ -1917,6 +1921,7 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
case REQ_OP_FLUSH:
case REQ_OP_DISCARD:
case REQ_OP_WRITE_ZEROES:
+ case REQ_OP_ASSIGN_RANGE:
cmd->use_aio = false;
break;
default:

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