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authorMikulas Patocka <mpatocka@redhat.com>2013-11-01 18:27:41 -0400
committerMike Snitzer <snitzer@redhat.com>2013-11-09 18:20:22 -0500
commit2c140a246dc0bc085b98eddde978060fcec1080c (patch)
tree73d747f4422fe202868495d08ea5d189bc16bd79 /drivers/md/dm.h
parent7833b08e18241a1c35c09ef38be840cbf6c58acf (diff)
downloadlinux-2c140a246dc0bc085b98eddde978060fcec1080c.tar.bz2
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 'drivers/md/dm.h')
-rw-r--r--drivers/md/dm.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 1d1ad7b7e527..c57ba550f69e 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -129,6 +129,16 @@ int dm_deleting_md(struct mapped_device *md);
int dm_suspended_md(struct mapped_device *md);
/*
+ * Test if the device is scheduled for deferred remove.
+ */
+int dm_test_deferred_remove_flag(struct mapped_device *md);
+
+/*
+ * Try to remove devices marked for deferred removal.
+ */
+void dm_deferred_remove(void);
+
+/*
* The device-mapper can be driven through one of two interfaces;
* ioctl or filesystem, depending which patch you have applied.
*/
@@ -158,7 +168,8 @@ void dm_stripe_exit(void);
void dm_destroy(struct mapped_device *md);
void dm_destroy_immediate(struct mapped_device *md);
int dm_open_count(struct mapped_device *md);
-int dm_lock_for_deletion(struct mapped_device *md);
+int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
+int dm_cancel_deferred_remove(struct mapped_device *md);
int dm_request_based(struct mapped_device *md);
sector_t dm_get_size(struct mapped_device *md);
struct dm_stats *dm_get_stats(struct mapped_device *md);