[PATCH v5 02/11] loop: Remove sector_t truncation checks

From: Martijn Coenen <maco@android.com>
To: axboe@kernel.dk, hch@lst.de, ming.lei@redhat.com
Cc: narayan@google.com, zezeozue@google.com, maco@google.com,
	kernel-team@android.com, bvanassche@acm.org,
	Chaitanya.Kulkarni@wdc.com, jaegeuk@kernel.org,
	linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
	Martijn Coenen <maco@android.com>
Subject: [PATCH v5 02/11] loop: Remove sector_t truncation checks
Date: Wed, 13 May 2020 15:38:36 +0200	[thread overview]
Message-ID: <20200513133845.244903-3-maco@android.com> (raw)
In-Reply-To: <20200513133845.244903-1-maco@android.com>

sector_t is now always u64, so we don't need to check for truncation.

Signed-off-by: Martijn Coenen <maco@android.com>
---
 drivers/block/loop.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index f1754262fc94..00de7fec0ed5 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -228,24 +228,20 @@ static void __loop_update_dio(struct loop_device *lo, bool dio)
 		blk_mq_unfreeze_queue(lo->lo_queue);
 }
 
-static int
+static void
 figure_loop_size(struct loop_device *lo, loff_t offset, loff_t sizelimit)
 {
 	loff_t size = get_size(offset, sizelimit, lo->lo_backing_file);
-	sector_t x = (sector_t)size;
 	struct block_device *bdev = lo->lo_device;
 
-	if (unlikely((loff_t)x != size))
-		return -EFBIG;
 	if (lo->lo_offset != offset)
 		lo->lo_offset = offset;
 	if (lo->lo_sizelimit != sizelimit)
 		lo->lo_sizelimit = sizelimit;
-	set_capacity(lo->lo_disk, x);
+	set_capacity(lo->lo_disk, size);
 	bd_set_size(bdev, (loff_t)get_capacity(bdev->bd_disk) << 9);
 	/* let user-space know about the new size */
 	kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
-	return 0;
 }
 
 static inline int
@@ -1003,10 +999,8 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode,
 	    !file->f_op->write_iter)
 		lo_flags |= LO_FLAGS_READ_ONLY;
 
-	error = -EFBIG;
 	size = get_loop_size(lo, file);
-	if ((loff_t)(sector_t)size != size)
-		goto out_unlock;
+
 	error = loop_prepare_queue(lo);
 	if (error)
 		goto out_unlock;
@@ -1328,10 +1322,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 				lo->lo_device->bd_inode->i_mapping->nrpages);
 			goto out_unfreeze;
 		}
-		if (figure_loop_size(lo, info->lo_offset, info->lo_sizelimit)) {
-			err = -EFBIG;
-			goto out_unfreeze;
-		}
+		figure_loop_size(lo, info->lo_offset, info->lo_sizelimit);
 	}
 
 	memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
@@ -1534,7 +1525,9 @@ static int loop_set_capacity(struct loop_device *lo)
 	if (unlikely(lo->lo_state != Lo_bound))
 		return -ENXIO;
 
-	return figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
+	figure_loop_size(lo, lo->lo_offset, lo->lo_sizelimit);
+
+	return 0;
 }
 
 static int loop_set_dio(struct loop_device *lo, unsigned long arg)
-- 
2.26.2.645.ge9eca65c58-goog

