From 6e57236ed6e070607868da70fac3d52ae24e5417 Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Tue, 17 Oct 2023 20:48:21 +0200
Subject: [PATCH] block: move bdev_mark_dead out of disk_check_media_change
disk_check_media_change is mostly called from ->open where it makes
little sense to mark the file system on the device as dead, as we
are just opening it. So instead of calling bdev_mark_dead from
disk_check_media_change move it into the few callers that are not
in an open instance. This avoid calling into bdev_mark_dead and
thus taking s_umount with open_mutex held.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20231017184823.1383356-4-hch@lst.de
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>
---
block/bdev.c | 9 ++++-----
block/disk-events.c | 18 +++++++-----------
drivers/block/ataflop.c | 4 +++-
drivers/block/floppy.c | 4 +++-
4 files changed, 17 insertions(+), 18 deletions(-)
diff --git a/block/bdev.c b/block/bdev.c
index 9838085102b3c..2018d250e1310 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -1019,14 +1019,13 @@ void bdev_mark_dead(struct block_device *bdev, bool surprise)
invalidate_bdev(bdev);
}
-#ifdef CONFIG_DASD_MODULE
/*
- * Drivers should not use this directly, but the DASD driver has historically
- * had a shutdown to offline mode that doesn't actually remove the gendisk
- * that otherwise looks a lot like a safe device removal.
+ * New drivers should not use this directly. There are some drivers however
+ * that needs this for historical reasons. For example, the DASD driver has
+ * historically had a shutdown to offline mode that doesn't actually remove the
+ * gendisk that otherwise looks a lot like a safe device removal.
*/
EXPORT_SYMBOL_GPL(bdev_mark_dead);
-#endif
void sync_bdevs(bool wait)
{
diff --git a/block/disk-events.c b/block/disk-events.c
index 13c3372c465a3..2f697224386aa 100644
--- a/block/disk-events.c
+++ b/block/disk-events.c
@@ -266,11 +266,8 @@ static unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask)
* disk_check_media_change - check if a removable media has been changed
* @disk: gendisk to check
*
- * Check whether a removable media has been changed, and attempt to free all
- * dentries and inodes and invalidates all block device page cache entries in
- * that case.
- *
- * Returns %true if the media has changed, or %false if not.
+ * Returns %true and marks the disk for a partition rescan whether a removable
+ * media has been changed, and %false if the media did not change.
*/
bool disk_check_media_change(struct gendisk *disk)
{
@@ -278,12 +275,11 @@ bool disk_check_media_change(struct gendisk *disk)
events = disk_clear_events(disk, DISK_EVENT_MEDIA_CHANGE |
DISK_EVENT_EJECT_REQUEST);
- if (!(events & DISK_EVENT_MEDIA_CHANGE))
- return false;
-
- bdev_mark_dead(disk->part0, true);
- set_bit(GD_NEED_PART_SCAN, &disk->state);
- return true;
+ if (events & DISK_EVENT_MEDIA_CHANGE) {
+ set_bit(GD_NEED_PART_SCAN, &disk->state);
+ return true;
+ }
+ return false;
}
EXPORT_SYMBOL(disk_check_media_change);
diff --git a/drivers/block/ataflop.c b/drivers/block/ataflop.c
index cd738cab725f3..50949207798d2 100644
--- a/drivers/block/ataflop.c
+++ b/drivers/block/ataflop.c
@@ -1760,8 +1760,10 @@ static int fd_locked_ioctl(struct block_device *bdev, blk_mode_t mode,
/* invalidate the buffer track to force a reread */
BufferDrive = -1;
set_bit(drive, &fake_change);
- if (disk_check_media_change(disk))
+ if (disk_check_media_change(disk)) {
+ bdev_mark_dead(disk->part0, true);
floppy_revalidate(disk);
+ }
return 0;
default:
return -EINVAL;
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index ea4eb88a2e45f..11114a5d9e5c4 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3215,8 +3215,10 @@ static int invalidate_drive(struct gendisk *disk)
/* invalidate the buffer track to force a reread */
set_bit((long)disk->private_data, &fake_change);
process_fd_request();
- if (disk_check_media_change(disk))
+ if (disk_check_media_change(disk)) {
+ bdev_mark_dead(disk->part0, true);
floppy_revalidate(disk);
+ }
return 0;
}
--
GitLab