This is a note to let you know that I've just added the patch titled
loop: Factor out setting loop device size
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
loop-factor-out-setting-loop-device-size.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From stable+bounces-27041-greg=kroah.com@xxxxxxxxxxxxxxx Thu Mar 7 05:20:03 2024
From: Genjian <zhanggenjian@xxxxxxx>
Date: Thu, 7 Mar 2024 12:14:07 +0800
Subject: loop: Factor out setting loop device size
To: stable@xxxxxxxxxxxxxxx
Cc: axboe@xxxxxxxxx, stable@xxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, zhanggenjian123@xxxxxxxxx, Martijn Coenen <maco@xxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, Genjian Zhang <zhanggenjian@xxxxxxxxxx>
Message-ID: <20240307041411.3792061-5-zhanggenjian@xxxxxxx>
From: Martijn Coenen <maco@xxxxxxxxxxx>
[ Upstream commit 5795b6f5607f7e4db62ddea144727780cb351a9b ]
This code is used repeatedly.
Signed-off-by: Martijn Coenen <maco@xxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Genjian Zhang <zhanggenjian@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/loop.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -226,20 +226,35 @@ static void __loop_update_dio(struct loo
blk_mq_unfreeze_queue(lo->lo_queue);
}
+/**
+ * loop_set_size() - sets device size and notifies userspace
+ * @lo: struct loop_device to set the size for
+ * @size: new size of the loop device
+ *
+ * Callers must validate that the size passed into this function fits into
+ * a sector_t, eg using loop_validate_size()
+ */
+static void loop_set_size(struct loop_device *lo, loff_t size)
+{
+ struct block_device *bdev = lo->lo_device;
+
+ set_capacity(lo->lo_disk, size);
+ bd_set_size(bdev, size << SECTOR_SHIFT);
+ /* let user-space know about the new size */
+ kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
+}
+
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);
- struct block_device *bdev = lo->lo_device;
if (lo->lo_offset != offset)
lo->lo_offset = offset;
if (lo->lo_sizelimit != sizelimit)
lo->lo_sizelimit = sizelimit;
- 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);
+
+ loop_set_size(lo, size);
}
static inline int
@@ -1033,11 +1048,8 @@ static int loop_set_fd(struct loop_devic
loop_update_rotational(lo);
loop_update_dio(lo);
- set_capacity(lo->lo_disk, size);
- bd_set_size(bdev, size << 9);
loop_sysfs_init(lo);
- /* let user-space know about the new size */
- kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
+ loop_set_size(lo, size);
set_blocksize(bdev, S_ISBLK(inode->i_mode) ?
block_size(inode->i_bdev) : PAGE_SIZE);
Patches currently in stable-queue which might be from kroah.com@xxxxxxxxxxxxxxx are
queue-5.4/loop-factor-out-configuring-loop-from-status.patch
queue-5.4/loop-call-loop_config_discard-only-after-new-config-is-applied.patch
queue-5.4/loop-refactor-loop_set_status-size-calculation.patch
queue-5.4/loop-factor-out-setting-loop-device-size.patch
queue-5.4/loop-check-for-overflow-while-configuring-loop.patch
queue-5.4/loop-remove-sector_t-truncation-checks.patch
queue-5.4/revert-loop-check-for-overflow-while-configuring-loop.patch
queue-5.4/loop-loop_set_status_from_info-check-before-assignment.patch
