From: Bryn Reeves 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 Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton --- drivers/md/dm-table.c | 5 +++++ include/linux/device-mapper.h | 2 ++ include/linux/dm-ioctl.h | 2 +- 3 files changed, 8 insertions(+), 1 deletion(-) diff -puN drivers/md/dm-table.c~dm-table-add-target-flush drivers/md/dm-table.c --- a/drivers/md/dm-table.c~dm-table-add-target-flush +++ a/drivers/md/dm-table.c @@ -1001,6 +1001,11 @@ int dm_table_flush_all(struct dm_table * { 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 -puN include/linux/device-mapper.h~dm-table-add-target-flush include/linux/device-mapper.h --- a/include/linux/device-mapper.h~dm-table-add-target-flush +++ a/include/linux/device-mapper.h @@ -55,6 +55,7 @@ typedef int (*dm_endio_fn) (struct dm_ta 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 -puN include/linux/dm-ioctl.h~dm-table-add-target-flush include/linux/dm-ioctl.h --- a/include/linux/dm-ioctl.h~dm-table-add-target-flush +++ a/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)" _