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dm thin: commit before gathering status

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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>
This commit is contained in:
Alasdair G Kergon
2012-07-27 15:08:16 +01:00
parent e49e582965
commit 1f4e0ff079
15 changed files with 35 additions and 20 deletions
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8
include/linux/dm-ioctl.h
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@@ -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 22
#define DM_VERSION_PATCHLEVEL 1
#define DM_VERSION_EXTRA "-ioctl (2012-06-01)"
#define DM_VERSION_MINOR 23
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2012-07-25)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
@@ -307,6 +307,8 @@ enum {
/*
* Set this to suspend without flushing queued ios.
* Also disables flushing uncommitted changes in the thin target before
* generating statistics for DM_TABLE_STATUS and DM_DEV_WAIT.
*/
#define DM_NOFLUSH_FLAG (1 << 11) /* In */