Author: mjg
Date: Fri Jul 10 06:46:42 2020
New Revision: 363068
URL: https://svnweb.freebsd.org/changeset/base/363068
Log:
vfs: avoid spurious memcpy in vfs_statfs
It is quite often called for the very same buffer.
Modified:
head/sys/kern/vfs_mount.c
Modified: head/sys/kern/vfs_mount.c
==============================================================================
--- head/sys/kern/vfs_mount.c Fri Jul 10 00:45:34 2020 (r363067)
+++ head/sys/kern/vfs_mount.c Fri Jul 10 06:46:42 2020 (r363068)
@@ -2173,7 +2173,8 @@ __vfs_statfs(struct mount *mp, struct statfs *sbp)
* Filesystems only fill in part of the structure for updates, we
* have to read the entirety first to get all content.
*/
- memcpy(sbp, &mp->mnt_stat, sizeof(*sbp));
+ if (sbp != &mp->mnt_stat)
+ memcpy(sbp, &mp->mnt_stat, sizeof(*sbp));
/*
* Set these in case the underlying filesystem fails to do so.
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