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authorAlasdair G Kergon <agk@redhat.com>2012-07-27 16:08:16 +0200
committerAlasdair G Kergon <agk@redhat.com>2012-07-27 16:08:16 +0200
commit1f4e0ff07980820977f45d6a5dbc81d3bb9ce4d3 (patch)
tree5b5a159add010d09ea58ca12fd079b16f05333b8 /drivers/md/dm.h
parentdm thin: add read only and fail io modes (diff)
downloadlinux-1f4e0ff07980820977f45d6a5dbc81d3bb9ce4d3.tar.xz
linux-1f4e0ff07980820977f45d6a5dbc81d3bb9ce4d3.zip
dm thin: commit before gathering status
Commit outstanding metadata before returning the status for a dm thin pool so that the numbers reported are as up-to-date as possible. The commit is not performed if the device is suspended or if the DM_NOFLUSH_FLAG is supplied by userspace and passed to the target through a new 'status_flags' parameter in the target's dm_status_fn. The userspace dmsetup tool will support the --noflush flag with the 'dmsetup status' and 'dmsetup wait' commands from version 1.02.76 onwards. Tested-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md/dm.h')
-rw-r--r--drivers/md/dm.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index b7dacd59d8d7..52eef493d266 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -23,6 +23,11 @@
#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
/*
+ * Status feature flags
+ */
+#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
+
+/*
* Type of table and mapped_device's mempool
*/
#define DM_TYPE_NONE 0