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vfs: add MNTK_NOMSYNC

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On many filesystems the traversal is effectively a no-op. Add a way to avoid
the overhead.

Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D22009
This commit is contained in:
Mateusz Guzik 2019-10-13 15:40:34 +00:00
parent 737241cd51
commit d1cbf3eeea
2 changed files with 4 additions and 0 deletions
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3
sys/kern/vfs_subr.c
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@ -4395,6 +4395,9 @@ vfs_msync(struct mount *mp, int flags)
CTR2(KTR_VFS, "%s: mp %p", __func__, mp);
if ((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0)
return;
MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) {
obj = vp->v_object;
if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0 &&

1
sys/sys/mount.h
View File

@ -396,6 +396,7 @@ void __mnt_vnode_markerfree_active(struct vnode **mvp, struct mount *);
#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
#define MNTK_ASYNC 0x00000002 /* filtered async flag */
#define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
#define MNTK_NOMSYNC 0x00000008 /* don't do vfs_msync */
#define MNTK_DRAINING 0x00000010 /* lock draining is happening */
#define MNTK_REFEXPIRE 0x00000020 /* refcount expiring is happening */
#define MNTK_EXTENDED_SHARED 0x00000040 /* Allow shared locking for more ops */