+ zram-move-discard-handling-to-zram_submit_bio.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: zram: move discard handling to zram_submit_bio
has been added to the -mm mm-unstable branch.  Its filename is
     zram-move-discard-handling-to-zram_submit_bio.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/zram-move-discard-handling-to-zram_submit_bio.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: zram: move discard handling to zram_submit_bio
Date: Tue, 11 Apr 2023 19:14:47 +0200

Switch on the bio operation in zram_submit_bio and only call into
__zram_make_request for read and write operations.

Link: https://lkml.kernel.org/r/20230411171459.567614-6-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/block/zram/zram_drv.c |   23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

--- a/drivers/block/zram/zram_drv.c~zram-move-discard-handling-to-zram_submit_bio
+++ a/drivers/block/zram/zram_drv.c
@@ -1958,15 +1958,6 @@ static void __zram_make_request(struct z
 	struct bio_vec bv;
 	unsigned long start_time;
 
-	switch (bio_op(bio)) {
-	case REQ_OP_DISCARD:
-	case REQ_OP_WRITE_ZEROES:
-		zram_bio_discard(zram, bio);
-		return;
-	default:
-		break;
-	}
-
 	start_time = bio_start_io_acct(bio);
 	bio_for_each_segment(bv, bio, iter) {
 		u32 index = iter.bi_sector >> SECTORS_PER_PAGE_SHIFT;
@@ -1990,7 +1981,19 @@ static void zram_submit_bio(struct bio *
 {
 	struct zram *zram = bio->bi_bdev->bd_disk->private_data;
 
-	__zram_make_request(zram, bio);
+	switch (bio_op(bio)) {
+	case REQ_OP_READ:
+	case REQ_OP_WRITE:
+		__zram_make_request(zram, bio);
+		break;
+	case REQ_OP_DISCARD:
+	case REQ_OP_WRITE_ZEROES:
+		zram_bio_discard(zram, bio);
+		break;
+	default:
+		WARN_ON_ONCE(1);
+		bio_endio(bio);
+	}
 }
 
 static void zram_slot_free_notify(struct block_device *bdev,
_

Patches currently in -mm which might be from hch@lst.de are

zram-always-compile-read_from_bdev_sync.patch
zram-remove-valid_io_request.patch
zram-make-zram_bio_discard-more-self-contained.patch
zram-simplify-bvec-iteration-in-__zram_make_request.patch
zram-move-discard-handling-to-zram_submit_bio.patch
zram-return-early-on-error-in-zram_bvec_rw.patch
zram-refactor-highlevel-read-and-write-handling.patch
zram-dont-use-highmem-for-the-bounce-buffer-in-zram_bvec_readwrite.patch
zram-rename-__zram_bvec_read-to-zram_read_page.patch
zram-directly-call-zram_read_page-in-writeback_store.patch
zram-refactor-zram_bdev_read.patch
zram-dont-pass-a-bvec-to-__zram_bvec_write.patch
zram-refactor-zram_bdev_write.patch
zram-pass-a-page-to-read_from_bdev.patch
zram-dont-return-errors-from-read_from_bdev_async.patch
zram-fix-synchronous-reads.patch
zram-return-errors-from-read_from_bdev_sync.patch