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| author | Tejun Heo <tj@kernel.org> | 2011-07-01 18:17:47 +0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-07-01 18:17:47 +0400 |
| commit | 85ef06d1d252f6a2e73b678591ab71caad4667bb (patch) | |
| tree | dc5cbc4f2e54f5b5b3f8653a595799e5fe0f2f18 /include | |
| parent | 04bf7869ca0fd12009aee301cac2264a36df4d98 (diff) | |
| download | linux-85ef06d1d252f6a2e73b678591ab71caad4667bb.tar.xz | |
block: flush MEDIA_CHANGE from drivers on close(2)
Currently, only open(2) is defined as the 'clearing' point. It has
two roles - first, it's an acknowledgement from userland indicating
that the event has been received and kernel can clear pending states
and proceed to generate more events. Secondly, it's passed on to
device drivers as a hint indicating that a synchronization point has
been reached and it might want to take a deeper look at the device.
The latter currently is only used by sr which uses two different
mechanisms - GET_EVENT_MEDIA_STATUS_NOTIFICATION and TEST_UNIT_READY
to discover events, where the former is lighter weight and safe to be
used repeatedly but may not provide full coverage. Among other
things, GET_EVENT can't detect media removal while TUR can.
This patch makes close(2) - blkdev_put() - indicate clearing hint for
MEDIA_CHANGE to drivers. disk_check_events() is renamed to
disk_flush_events() and updated to take @mask for events to flush
which is or'd to ev->clearing and will be passed to the driver on the
next ->check_events() invocation.
This change makes sr generate MEDIA_CHANGE when media is ejected from
userland - e.g. with eject(1).
Note: Given the current usage, it seems @clearing hint is needlessly
complex. disk_clear_events() can simply clear all events and the hint
can be boolean @flush.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/genhd.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index 300d7582006e..02fa4697a0e5 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -420,7 +420,7 @@ static inline int get_disk_ro(struct gendisk *disk) extern void disk_block_events(struct gendisk *disk); extern void disk_unblock_events(struct gendisk *disk); -extern void disk_check_events(struct gendisk *disk); +extern void disk_flush_events(struct gendisk *disk, unsigned int mask); extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); /* drivers/char/random.c */ |