diff options
| author | Matteo Croce <mcroce@microsoft.com> | 2021-07-13 01:05:30 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-02 13:37:29 -0600 |
| commit | 9f65c489b68d42427dc0651488dd260d678f525d (patch) | |
| tree | a6b1cd7f02596190763931d26943b8a5c434de54 /drivers/block/loop.c | |
| parent | e6138dc12de9df17cbda9c40314d69592855ac5e (diff) | |
| download | linux-9f65c489b68d42427dc0651488dd260d678f525d.tar.gz | |
loop: raise media_change event
Make the loop device raise a DISK_MEDIA_CHANGE event on attach or detach.
# udevadm monitor -up |grep -e DISK_MEDIA_CHANGE -e DEVNAME &
# losetup -f zero
[ 7.454235] loop0: detected capacity change from 0 to 16384
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop0
DEVNAME=/dev/loop0
DEVNAME=/dev/loop0
# losetup -f zero
[ 10.205245] loop1: detected capacity change from 0 to 16384
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop1
DEVNAME=/dev/loop1
DEVNAME=/dev/loop1
# losetup -f zero2
[ 13.532368] loop2: detected capacity change from 0 to 40960
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop2
DEVNAME=/dev/loop2
# losetup -D
DEVNAME=/dev/loop1
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop1
DEVNAME=/dev/loop2
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop2
DEVNAME=/dev/loop0
DISK_MEDIA_CHANGE=1
DEVNAME=/dev/loop0
Signed-off-by: Matteo Croce <mcroce@microsoft.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Luca Boccassi <bluca@debian.org>
Link: https://lore.kernel.org/r/20210712230530.29323-7-mcroce@linux.microsoft.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/loop.c')
| -rw-r--r-- | drivers/block/loop.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/block/loop.c b/drivers/block/loop.c index a03ef5025f271c..f8486d9b75a49d 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -774,6 +774,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, goto out_err; /* and ... switch */ + disk_force_media_change(lo->lo_disk, DISK_EVENT_MEDIA_CHANGE); blk_mq_freeze_queue(lo->lo_queue); mapping_set_gfp_mask(old_file->f_mapping, lo->old_gfp_mask); lo->lo_backing_file = file; @@ -1257,6 +1258,7 @@ static int loop_configure(struct loop_device *lo, fmode_t mode, goto out_unlock; } + disk_force_media_change(lo->lo_disk, DISK_EVENT_MEDIA_CHANGE); set_disk_ro(lo->lo_disk, (lo->lo_flags & LO_FLAGS_READ_ONLY) != 0); INIT_WORK(&lo->rootcg_work, loop_rootcg_workfn); @@ -1410,6 +1412,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) partscan = lo->lo_flags & LO_FLAGS_PARTSCAN && bdev; lo_number = lo->lo_number; + disk_force_media_change(lo->lo_disk, DISK_EVENT_MEDIA_CHANGE); out_unlock: mutex_unlock(&lo->lo_mutex); if (partscan) { @@ -2386,6 +2389,8 @@ static int loop_add(int i) disk->fops = &lo_fops; disk->private_data = lo; disk->queue = lo->lo_queue; + disk->events = DISK_EVENT_MEDIA_CHANGE; + disk->event_flags = DISK_EVENT_FLAG_UEVENT; sprintf(disk->disk_name, "loop%d", i); add_disk(disk); mutex_unlock(&loop_ctl_mutex); |