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authorMikulas Patocka <mpatocka@redhat.com>2013-11-02 02:27:41 +0400
committerMike Snitzer <snitzer@redhat.com>2013-11-10 03:20:22 +0400
commit2c140a246dc0bc085b98eddde978060fcec1080c (patch)
tree73d747f4422fe202868495d08ea5d189bc16bd79 /include/uapi
parent7833b08e18241a1c35c09ef38be840cbf6c58acf (diff)
downloadlinux-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 'include/uapi')
-rw-r--r--include/uapi/linux/dm-ioctl.h15
1 files changed, 13 insertions, 2 deletions
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index f1e12bd40b3b..c8a4302093a3 100644
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 26
+#define DM_VERSION_MINOR 27
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2013-08-15)"
+#define DM_VERSION_EXTRA "-ioctl (2013-10-30)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
@@ -341,4 +341,15 @@ enum {
*/
#define DM_DATA_OUT_FLAG (1 << 16) /* Out */
+/*
+ * If set with DM_DEV_REMOVE or DM_REMOVE_ALL this indicates that if
+ * the device cannot be removed immediately because it is still in use
+ * it should instead be scheduled for removal when it gets closed.
+ *
+ * On return from DM_DEV_REMOVE, DM_DEV_STATUS or other ioctls, this
+ * flag indicates that the device is scheduled to be removed when it
+ * gets closed.
+ */
+#define DM_DEFERRED_REMOVE (1 << 17) /* In/Out */
+
#endif /* _LINUX_DM_IOCTL_H */