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| author | Mikulas Patocka <mpatocka@redhat.com> | 2013-11-02 02:27:41 +0400 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2013-11-10 03:20:22 +0400 |
| commit | 2c140a246dc0bc085b98eddde978060fcec1080c (patch) | |
| tree | 73d747f4422fe202868495d08ea5d189bc16bd79 /usr | |
| parent | 7833b08e18241a1c35c09ef38be840cbf6c58acf (diff) | |
| download | linux-2c140a246dc0bc085b98eddde978060fcec1080c.tar.xz | |
dm: allow remove to be deferred
This patch allows the removal of an open device to be deferred until
it is closed. (Previously such a removal attempt would fail.)
The deferred remove functionality is enabled by setting the flag
DM_DEFERRED_REMOVE in the ioctl structure on DM_DEV_REMOVE or
DM_REMOVE_ALL ioctl.
On return from DM_DEV_REMOVE, the flag DM_DEFERRED_REMOVE indicates if
the device was removed immediately or flagged to be removed on close -
if the flag is clear, the device was removed.
On return from DM_DEV_STATUS and other ioctls, the flag
DM_DEFERRED_REMOVE is set if the device is scheduled to be removed on
closure.
A device that is scheduled to be deleted can be revived using the
message "@cancel_deferred_remove". This message clears the
DMF_DEFERRED_REMOVE flag so that the device won't be deleted on close.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'usr')
0 files changed, 0 insertions, 0 deletions