[PATCH] dm table: add target flush

This patch adds support for a per-target dm_flush_fn method.  This is needed
to allow dm-loop to invalidate page cache mappings in response to BLKFLSBUF
ioctl commands.

Signed-off-by: Bryn Reeves <breeves@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 4920998..05befa9 100644 (file)
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1001,6 +1001,11 @@ int dm_table_flush_all(struct dm_table *t)
 {
        struct list_head *d, *devices = dm_table_get_devices(t);
        int ret = 0;
+       unsigned i;
+
+       for (i = 0; i < t->num_targets; i++)
+               if (t->targets[i].type->flush)
+                       t->targets[i].type->flush(&t->targets[i]);
 
        for (d = devices->next; d != devices; d = d->next) {
                struct dm_dev *dd = list_entry(d, struct dm_dev, list);

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 7a48d42..03ef41c 100644 (file)
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -55,6 +55,7 @@ typedef int (*dm_endio_fn) (struct dm_target *ti,
                            struct bio *bio, int error,
                            union map_info *map_context);
 
+typedef void (*dm_flush_fn) (struct dm_target *ti);
 typedef void (*dm_presuspend_fn) (struct dm_target *ti);
 typedef void (*dm_postsuspend_fn) (struct dm_target *ti);
 typedef int (*dm_preresume_fn) (struct dm_target *ti);
@@ -96,6 +97,7 @@ struct target_type {
        dm_dtr_fn dtr;
        dm_map_fn map;
        dm_endio_fn end_io;
+       dm_flush_fn flush;
        dm_presuspend_fn presuspend;
        dm_postsuspend_fn postsuspend;
        dm_preresume_fn preresume;

diff --git a/include/linux/dm-ioctl.h b/include/linux/dm-ioctl.h
index f28b5c8..8853fc4 100644 (file)
--- a/include/linux/dm-ioctl.h
+++ b/include/linux/dm-ioctl.h
@@ -285,7 +285,7 @@ typedef char ioctl_struct[308];
 #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       9
+#define DM_VERSION_MINOR       10
 #define DM_VERSION_PATCHLEVEL  0
 #define DM_VERSION_EXTRA       "-ioctl (2006-09-14)"