From 1eb5fa849f2bf9186a618e85bea23f02e527540a Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Wed, 28 Feb 2018 15:59:59 -0500
Subject: [PATCH] dm: allow targets to return output from messages they are
sent
Git-commit: 1eb5fa849f2bf9186a618e85bea23f02e527540a
References: bsc#1111974
Patch-mainline: v4.17-rc1
Could be useful for a target to return stats or other information.
If a target does DMEMIT() anything to @result from its .message method
then it must return 1 to the caller.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>
---
drivers/md/dm-cache-target.c | 3 ++-
drivers/md/dm-crypt.c | 3 ++-
drivers/md/dm-era-target.c | 3 ++-
drivers/md/dm-ioctl.c | 2 +-
drivers/md/dm-log-writes.c | 3 ++-
drivers/md/dm-mpath.c | 3 ++-
drivers/md/dm-raid.c | 3 ++-
drivers/md/dm-switch.c | 3 ++-
drivers/md/dm-thin.c | 3 ++-
include/linux/device-mapper.h | 3 ++-
include/uapi/linux/dm-ioctl.h | 4 ++--
11 files changed, 21 insertions(+), 12 deletions(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 47407e43b96a..da208638fba4 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -3387,7 +3387,8 @@ static int process_invalidate_cblocks_message(struct cache *cache, unsigned coun
*
* The key migration_threshold is supported by the cache target core.
*/
-static int cache_message(struct dm_target *ti, unsigned argc, char **argv)
+static int cache_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
struct cache *cache = ti->private;
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 8168f737590e..dd9b5332b39c 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -2942,7 +2942,8 @@ static void crypt_resume(struct dm_target *ti)
* key set <key>
* key wipe
*/
-static int crypt_message(struct dm_target *ti, unsigned argc, char **argv)
+static int crypt_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
struct crypt_config *cc = ti->private;
int key_size, ret = -EINVAL;
diff --git a/drivers/md/dm-era-target.c b/drivers/md/dm-era-target.c
index 73a5c198113a..8e48920a3ffa 100644
--- a/drivers/md/dm-era-target.c
+++ b/drivers/md/dm-era-target.c
@@ -1635,7 +1635,8 @@ static void era_status(struct dm_target *ti, status_type_t type,
DMEMIT("Error");
}
-static int era_message(struct dm_target *ti, unsigned argc, char **argv)
+static int era_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
struct era *era = ti->private;
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index a89fd8f44453..5acf77de5945 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1595,7 +1595,7 @@ static int target_message(struct file *filp, struct dm_ioctl *param, size_t para
DMWARN("Target message sector outside device.");
r = -EINVAL;
} else if (ti->type->message)
- r = ti->type->message(ti, argc, argv);
+ r = ti->type->message(ti, argc, argv, result, maxlen);
else {
DMWARN("Target type does not support messages");
r = -EINVAL;
diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index 3362d866793b..e4c015dfef43 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -887,7 +887,8 @@ static int log_writes_iterate_devices(struct dm_target *ti,
* Messages supported:
* mark <mark data> - specify the marked data.
*/
-static int log_writes_message(struct dm_target *ti, unsigned argc, char **argv)
+static int log_writes_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
int r = -EINVAL;
struct log_writes_c *lc = ti->private;
diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index a6b7baf31cdd..1e60ec44942e 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1811,7 +1811,8 @@ static void multipath_status(struct dm_target *ti, status_type_t type,
spin_unlock_irqrestore(&m->lock, flags);
}
-static int multipath_message(struct dm_target *ti, unsigned argc, char **argv)
+static int multipath_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
int r = -EINVAL;
struct dm_dev *dev;
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index c1d1034ff7b7..b7a9c710ebec 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -3663,7 +3663,8 @@ static void raid_status(struct dm_target *ti, status_type_t type,
}
}
-static int raid_message(struct dm_target *ti, unsigned int argc, char **argv)
+static int raid_message(struct dm_target *ti, unsigned int argc, char **argv,
+ char *result, unsigned maxlen)
{
struct raid_set *rs = ti->private;
struct mddev *mddev = &rs->md;
diff --git a/drivers/md/dm-switch.c b/drivers/md/dm-switch.c
index 8d0ba879777e..8f9208c2d2e3 100644
--- a/drivers/md/dm-switch.c
+++ b/drivers/md/dm-switch.c
@@ -466,7 +466,8 @@ static int process_set_region_mappings(struct switch_ctx *sctx,
*
* Only set_region_mappings is supported.
*/
-static int switch_message(struct dm_target *ti, unsigned argc, char **argv)
+static int switch_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
static DEFINE_MUTEX(message_mutex);
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 629c555890c1..b11107497d2e 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3705,7 +3705,8 @@ static int process_release_metadata_snap_mesg(unsigned argc, char **argv, struct
* reserve_metadata_snap
* release_metadata_snap
*/
-static int pool_message(struct dm_target *ti, unsigned argc, char **argv)
+static int pool_message(struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen)
{
int r = -EINVAL;
struct pool_c *pt = ti->private;
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index da83f64952e7..1e2426c18eb4 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -87,7 +87,8 @@ typedef void (*dm_resume_fn) (struct dm_target *ti);
typedef void (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
unsigned status_flags, char *result, unsigned maxlen);
-typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);
+typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv,
+ char *result, unsigned maxlen);
typedef int (*dm_prepare_ioctl_fn) (struct dm_target *ti,
struct block_device **bdev, fmode_t *mode);
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index 14c44ec8b622..5108da02cd32 100644
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -270,9 +270,9 @@ 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 37
+#define DM_VERSION_MINOR 38
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2017-09-20)"
+#define DM_VERSION_EXTRA "-ioctl (2018-02-28)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
--
2.19.0