linux-kernel - [PATCH v4 1/2] loop: Rename and merge get_size/get_loop_size to lo_calculate

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Message-ID: <20250813195228.12021-2-rajeevm@hpe.com>
Date: Wed, 13 Aug 2025 19:52:26 +0000
From: Rajeev Mishra <rajeevm@....com>
To: axboe@...nel.dk, yukuai1@...weicloud.com
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rajeev Mishra <rajeevm@....com>
Subject: [PATCH v4 1/2] loop: Rename and merge get_size/get_loop_size to lo_calculate_size

- Renamed get_size to lo_calculate_size.
- Merged get_size and get_loop_size logic into lo_calculate_size.
- Updated all callers to use lo_calculate_size.
- Added header to lo_calculate_size.

Signed-off-by: Rajeev Mishra <rajeevm@....com>
---
 drivers/block/loop.c | 50 +++++++++++++++++++-------------------------
 1 file changed, 21 insertions(+), 29 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 1b6ee91f8eb9..5faf8607dfb2 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -137,30 +137,23 @@ static void loop_global_unlock(struct loop_device *lo, bool global)
 static int max_part;
 static int part_shift;
 
-static loff_t get_size(loff_t offset, loff_t sizelimit, struct file *file)
-{
-	loff_t loopsize;
-
-	/* Compute loopsize in bytes */
-	loopsize = i_size_read(file->f_mapping->host);
-	if (offset > 0)
-		loopsize -= offset;
-	/* offset is beyond i_size, weird but possible */
-	if (loopsize < 0)
-		return 0;
-
-	if (sizelimit > 0 && sizelimit < loopsize)
-		loopsize = sizelimit;
-	/*
-	 * Unfortunately, if we want to do I/O on the device,
-	 * the number of 512-byte sectors has to fit into a sector_t.
-	 */
-	return loopsize >> 9;
-}
-
-static loff_t get_loop_size(struct loop_device *lo, struct file *file)
-{
-	return get_size(lo->lo_offset, lo->lo_sizelimit, file);
+static loff_t lo_calculate_size(struct loop_device *lo, struct file *file)
+{
+       loff_t loopsize;
+       /* Compute loopsize in bytes */
+       loopsize = i_size_read(file->f_mapping->host);
+       if (lo->lo_offset > 0)
+	       loopsize -= lo->lo_offset;
+       /* offset is beyond i_size, weird but possible */
+       if (loopsize < 0)
+	       return 0;
+       if (lo->lo_sizelimit > 0 && lo->lo_sizelimit < loopsize)
+	       loopsize = lo->lo_sizelimit;
+       /*
+	* Unfortunately, if we want to do I/O on the device,
+	* the number of 512-byte sectors has to fit into a sector_t.
+	*/
+       return loopsize >> 9;
 }
 
 /*
@@ -569,7 +562,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
 	error = -EINVAL;
 
 	/* size of the new backing store needs to be the same */
-	if (get_loop_size(lo, file) != get_loop_size(lo, old_file))
+	if (lo_calculate_size(lo, file) != lo_calculate_size(lo, old_file))
 		goto out_err;
 
 	/*
@@ -1063,7 +1056,7 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode,
 	loop_update_dio(lo);
 	loop_sysfs_init(lo);
 
-	size = get_loop_size(lo, file);
+	size = lo_calculate_size(lo, file);
 	loop_set_size(lo, size);
 
 	/* Order wrt reading lo_state in loop_validate_file(). */
@@ -1255,8 +1248,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 	if (partscan)
 		clear_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state);
 	if (!err && size_changed) {
-		loff_t new_size = get_size(lo->lo_offset, lo->lo_sizelimit,
-					   lo->lo_backing_file);
+		loff_t new_size = lo_calculate_size(lo, lo->lo_backing_file);
 		loop_set_size(lo, new_size);
 	}
 out_unlock:
@@ -1399,7 +1391,7 @@ static int loop_set_capacity(struct loop_device *lo)
 	if (unlikely(lo->lo_state != Lo_bound))
 		return -ENXIO;
 
-	size = get_loop_size(lo, lo->lo_backing_file);
+	size = lo_calculate_size(lo, lo->lo_backing_file);
 	loop_set_size(lo, size);
 
 	return 0;
-- 
2.43.7