mkfs created more than one fs_devices in fs_uuids.
1: one is for file system been created
2: others are created in test_dev_for_mkfs for check mount point
   test_dev_for_mkfs()-> ... -> btrfs_scan_one_device()

Current code only close above 1, and this patch close above 2.

Similar problem exist in other tools, for ex:
 cmd-check.c: the function is:
 cmd_check()->check_mounted()-> ... -> btrfs_scan_one_device()
 ...

Signed-off-by: Zhao Lei <zhao...@cn.fujitsu.com>
---
 cmds-check.c   | 1 +
 cmds-device.c  | 4 ++++
 cmds-replace.c | 2 ++
 mkfs.c         | 1 +
 4 files changed, 8 insertions(+)

diff --git a/cmds-check.c b/cmds-check.c
index 2e6dc68..9828ce2 100644
--- a/cmds-check.c
+++ b/cmds-check.c
@@ -9589,6 +9589,7 @@ out:
        free_root_recs_tree(&root_cache);
 close_out:
        close_ctree(root);
+       btrfs_close_all_devices();
 err_out:
        return ret;
 }
diff --git a/cmds-device.c b/cmds-device.c
index 458c088..00e362a 100644
--- a/cmds-device.c
+++ b/cmds-device.c
@@ -28,6 +28,7 @@
 #include "ctree.h"
 #include "ioctl.h"
 #include "utils.h"
+#include "volumes.h"
 #include "cmds-fi-usage.h"
 
 #include "commands.h"
@@ -140,6 +141,7 @@ static int cmd_device_add(int argc, char **argv)
 
 error_out:
        close_file_or_dir(fdmnt, dirstream);
+       btrfs_close_all_devices();
        return !!ret;
 }
 
@@ -290,6 +292,7 @@ static int cmd_device_scan(int argc, char **argv)
        }
 
 out:
+       btrfs_close_all_devices();
        return !!ret;
 }
 
@@ -465,6 +468,7 @@ static int cmd_device_stats(int argc, char **argv)
 out:
        free(di_args);
        close_file_or_dir(fdmnt, dirstream);
+       btrfs_close_all_devices();
 
        return err;
 }
diff --git a/cmds-replace.c b/cmds-replace.c
index 2f123cb..ce91787 100644
--- a/cmds-replace.c
+++ b/cmds-replace.c
@@ -316,6 +316,7 @@ static int cmd_replace_start(int argc, char **argv)
                }
        }
        close_file_or_dir(fdmnt, dirstream);
+       btrfs_close_all_devices();
        return 0;
 
 leave_with_error:
@@ -325,6 +326,7 @@ leave_with_error:
                close(fdmnt);
        if (fddstdev != -1)
                close(fddstdev);
+       btrfs_close_all_devices();
        return 1;
 }
 
diff --git a/mkfs.c b/mkfs.c
index 7d635dc..3e60965 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1843,6 +1843,7 @@ raid_groups:
 out:
        ret = close_ctree(root);
        BUG_ON(ret);
+       btrfs_close_all_devices();
        free(label);
        return 0;
 }
-- 
1.8.5.1

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