[Devel] [PATCH RHEL8 COMMIT] dm-tracking: Add tracking_clear cmd

[Konstantin Khorenko]

The commit is pushed to "branch-rh8-4.18.0-305.3.1.vz8.7.x-ovz" and will appear 
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh8-4.18.0-305.3.1.vz8.7.15
------>
commit 3d95fbc62580f9020870d327d7518a09fe7c3237
Author: Kirill Tkhai <ktk...@virtuozzo.com>
Date:   Thu Sep 30 22:08:14 2021 +0300

    dm-tracking: Add tracking_clear cmd
    
    Command to ACK ordered copied cluster.
    
    Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 drivers/md/dm-tracking.c | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/drivers/md/dm-tracking.c b/drivers/md/dm-tracking.c
index c49e79cf1514..ef1662ffac2e 100644
--- a/drivers/md/dm-tracking.c
+++ b/drivers/md/dm-tracking.c
@@ -170,6 +170,14 @@ static void dmt_dtr(struct dm_target *ti)
        dmt_destroy(ti->private);
 }
 
+static int tracking_clear(struct dm_tracking *dmt, u64 clu)
+{
+       spin_lock_irq(&dmt->lock);
+       clear_bit(clu, dmt->bitmap);
+       spin_unlock_irq(&dmt->lock);
+       return 0;
+}
+
 static int tracking_get_next(struct dm_tracking *dmt, char *result,
                             unsigned int maxlen)
 {
@@ -199,10 +207,24 @@ static int tracking_get_next(struct dm_tracking *dmt, 
char *result,
 }
 
 static int dmt_cmd(struct dm_tracking *dmt, const char *suffix,
+                  int argc, char *argv[],
                   char *result, unsigned int maxlen)
 {
        unsigned int nr_clus, size;
        void *bitmap = NULL;
+       u64 val;
+
+       if (!strcmp(suffix, "clear")) {
+               if (argc != 1 || kstrtou64(argv[0], 10, &val) < 0 ||
+                   val >= dmt->nr_clus)
+                       return -EINVAL;
+               if (!dmt->bitmap)
+                       return -ENOENT;
+               return tracking_clear(dmt, val);
+       }
+
+       if (argc != 0)
+               return -EINVAL;
 
        if (!strcmp(suffix, "get_next")) {
                if (!dmt->bitmap)
@@ -252,13 +274,14 @@ static int dmt_message(struct dm_target *ti, unsigned int 
argc, char **argv,
                return -EPERM;
 
        mutex_lock(&dmt->ctl_mutex);
+       ret = -EINVAL;
+       if (argc < 1)
+               goto unlock;
        ret = -ENOTSUPP;
        if (strncmp(argv[0], "tracking_", 9))
                goto unlock;
-       ret = -EINVAL;
-       if (argc != 1)
-               goto unlock;
-       ret = dmt_cmd(dmt, argv[0] + 9, result, maxlen);
+       ret = dmt_cmd(dmt, argv[0] + 9, argc - 1,
+                     &argv[1], result, maxlen);
 unlock:
        mutex_unlock(&dmt->ctl_mutex);
 
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