linux-ext4 - [PATCH 06/21] scsi: simplify scsi_bios

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Message-Id: <20200312151939.645254-7-hch@lst.de>
Date:   Thu, 12 Mar 2020 16:19:24 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-block@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-ext4@...r.kernel.org,
        reiserfs-devel@...r.kernel.org
Subject: [PATCH 06/21] scsi: simplify scsi_bios_ptable

Use read_mapping_page and kmemdup instead of the odd read_dev_sector and
put_dev_sector helpers from the partitioning code.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/scsi/scsicam.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/scsicam.c b/drivers/scsi/scsicam.c
index e969138051c7..91a9530a4dcb 100644
--- a/drivers/scsi/scsicam.c
+++ b/drivers/scsi/scsicam.c
@@ -35,19 +35,17 @@ static int setsize(unsigned long capacity, unsigned int *cyls, unsigned int *hds
  */
 unsigned char *scsi_bios_ptable(struct block_device *dev)
 {
-	unsigned char *res = kmalloc(66, GFP_KERNEL);
-	if (res) {
-		struct block_device *bdev = dev->bd_contains;
-		Sector sect;
-		void *data = read_dev_sector(bdev, 0, &sect);
-		if (data) {
-			memcpy(res, data + 0x1be, 66);
-			put_dev_sector(sect);
-		} else {
-			kfree(res);
-			res = NULL;
-		}
-	}
+	struct address_space *mapping = dev->bd_contains->bd_inode->i_mapping;
+	unsigned char *res = NULL;
+	struct page *page;
+
+	page = read_mapping_page(mapping, 0, NULL);
+	if (IS_ERR(page))
+		return NULL;
+
+	if (!PageError(page))
+		res = kmemdup(page_address(page) + 0x1be, 66, GFP_KERNEL);
+	put_page(page);
 	return res;
 }
 EXPORT_SYMBOL(scsi_bios_ptable);
-- 
2.24.1