[Devel] [PATCH RHEL7 COMMIT] ploop: Kill unused truncate ioctl()

[Vasily Averin]

The commit is pushed to "branch-rh7-3.10.0-1127.18.2.vz7.163.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-1127.18.2.vz7.163.23
------>
commit 897c8c6ae668b086688df0683d12779fd3615ad0
Author: Kirill Tkhai <ktkhai at virtuozzo.com>
Date:   Thu Sep 17 12:39:38 2020 +0300

    ploop: Kill unused truncate ioctl()
    
    This was never used.
    
    Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
---
 drivers/block/ploop/dev.c      | 49 ------------------------------------------
 include/linux/ploop/ploop_if.h |  2 +-
 2 files changed, 1 insertion(+), 50 deletions(-)

diff --git a/drivers/block/ploop/dev.c b/drivers/block/ploop/dev.c
index 24e69e0..c09cafc 100644
--- a/drivers/block/ploop/dev.c
+++ b/drivers/block/ploop/dev.c
@@ -4159,52 +4159,6 @@ out:
 	return err;
 }
 
-static int ploop_truncate(struct ploop_device * plo, unsigned long arg)
-{
-	int err;
-	struct ploop_truncate_ctl ctl;
-	struct ploop_delta * delta;
-	struct file * file;
-
-	if (copy_from_user(&ctl, (void*)arg, sizeof(struct ploop_truncate_ctl)))
-		return -EFAULT;
-
-	if (ctl.fd < 0)
-		return -EBADF;
-
-	if (list_empty(&plo->map.delta_list))
-		return -ENOENT;
-
-	delta = find_delta(plo, ctl.level);
-	if (delta == NULL)
-		return -ENOENT;
-
-	if (!(delta->flags & PLOOP_FMT_RDONLY))
-		return -EBUSY;
-
-	if (delta->ops->truncate == NULL)
-		return -EOPNOTSUPP;
-
-	file = fget(ctl.fd);
-	if (file == NULL)
-		return -EBADF;
-
-	ploop_quiesce(plo);
-
-	ploop_map_destroy(&plo->map);
-
-	err = delta->ops->truncate(delta, file, ctl.alloc_head);
-	if (!err)
-		/* See comment in dio_release_prealloced */
-		delta->io.prealloced_size = 0;
-
-	ploop_relax(plo);
-
-	fput(file);
-
-	return err;
-}
-
 static int ploop_bd_full(struct backing_dev_info *bdi, long long nr, int root)
 {
 	struct ploop_device *plo      = bdi->congested_data;
@@ -5581,9 +5535,6 @@ static int ploop_ioctl(struct block_device *bdev, fmode_t fmode, unsigned int cm
 	case PLOOP_IOC_MERGE:
 		err = ploop_merge(plo);
 		break;
-	case PLOOP_IOC_TRUNCATE:
-		err = ploop_truncate(plo, arg);
-		break;
 	case PLOOP_IOC_UPDATE_INDEX:
 		err = ploop_index_update_ioc(plo, arg);
 		break;
diff --git a/include/linux/ploop/ploop_if.h b/include/linux/ploop/ploop_if.h
index 213fc3a..34fbd17 100644
--- a/include/linux/ploop/ploop_if.h
+++ b/include/linux/ploop/ploop_if.h
@@ -321,7 +321,7 @@ struct ploop_track_extent
 /* Replace alive delta with equivalent one. */
 #define PLOOP_IOC_REPLACE_DELTA	_IOW(PLOOPCTLTYPE, 13, struct ploop_ctl)
 
-/* Replace alive delta with equivalent one. */
+/* This was never used */
 #define PLOOP_IOC_TRUNCATE	_IOW(PLOOPCTLTYPE, 14, struct ploop_truncate_ctl)
 
 /* Update in-core copy of L2 table */