linux-kernel - [PATCH 8/8] bdi: remove the name field in struct backing_dev

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Date:   Thu, 16 Apr 2020 09:15:19 +0200
From:   Christoph Hellwig <hch@....de>
To:     axboe@...nel.dk
Cc:     yuyufen@...wei.com, tj@...nel.org, jack@...e.cz,
        bvanassche@....org, tytso@....edu, gregkh@...uxfoundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 8/8] bdi: remove the name field in struct backing_dev_info

The name is only printed for a not registered bdi in writeback.  Use the
device name there as is more useful anyway for the unlike case that the
warning triggers.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 block/blk-core.c                 | 1 -
 drivers/mtd/mtdcore.c            | 1 -
 fs/fs-writeback.c                | 2 +-
 fs/super.c                       | 2 --
 include/linux/backing-dev-defs.h | 2 --
 mm/backing-dev.c                 | 1 -
 6 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index ab87f2833ab2..f37068c611bf 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -494,7 +494,6 @@ struct request_queue *__blk_alloc_queue(int node_id)
 
 	q->backing_dev_info->ra_pages = VM_READAHEAD_PAGES;
 	q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK;
-	q->backing_dev_info->name = "block";
 	q->node = node_id;
 
 	timer_setup(&q->backing_dev_info->laptop_mode_wb_timer,
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 39ec563d9a14..fcb018ce17c3 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -2040,7 +2040,6 @@ static struct backing_dev_info * __init mtd_bdi_init(char *name)
 	if (!bdi)
 		return ERR_PTR(-ENOMEM);
 
-	bdi->name = name;
 	/*
 	 * We put '-0' suffix to the name to get the same name format as we
 	 * used to get. Since this is called only once, we get a unique name. 
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 76ac9c7d32ec..d85323607b49 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -2320,7 +2320,7 @@ void __mark_inode_dirty(struct inode *inode, int flags)
 
 			WARN(bdi_cap_writeback_dirty(wb->bdi) &&
 			     !test_bit(WB_registered, &wb->state),
-			     "bdi-%s not registered\n", wb->bdi->name);
+			     "bdi-%s not registered\n", bdi_dev_name(wb->bdi));
 
 			inode->dirtied_when = jiffies;
 			if (dirtytime)
diff --git a/fs/super.c b/fs/super.c
index dd28fcd706ff..4991f441988e 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1602,8 +1602,6 @@ int super_setup_bdi_name(struct super_block *sb, char *fmt, ...)
 	if (!bdi)
 		return -ENOMEM;
 
-	bdi->name = sb->s_type->name;
-
 	va_start(args, fmt);
 	err = bdi_register_va(bdi, fmt, args);
 	va_end(args);
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 249590bcccf7..0a55170b2142 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -194,8 +194,6 @@ struct backing_dev_info {
 	congested_fn *congested_fn; /* Function pointer if device is md/dm */
 	void *congested_data;	/* Pointer to aux data for congested func */
 
-	const char *name;
-
 	struct kref refcnt;	/* Reference counter for the structure */
 	unsigned int capabilities; /* Device capabilities */
 	unsigned int min_ratio;
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 119a41650833..dc7215dfd56b 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -15,7 +15,6 @@
 #include <trace/events/writeback.h>
 
 struct backing_dev_info noop_backing_dev_info = {
-	.name		= "noop",
 	.capabilities	= BDI_CAP_NO_ACCT_AND_WRITEBACK,
 };
 EXPORT_SYMBOL_GPL(noop_backing_dev_info);
-- 
2.25.1