Date: Mon, 14 Jan 2013 05:41:41 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r245406 - in head/sys: kern sys Message-ID: <201301140541.r0E5ffTP050675@svn.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: kib Date: Mon Jan 14 05:41:40 2013 New Revision: 245406 URL: http://svnweb.freebsd.org/changeset/base/245406 Log: Add exported vfs_hash_index() function, which calculates the canonical pre-masked hash for the given vnode. The function assumes that vp->v_hash is initialized by the filesystem vnode instantiation function. At the moment, it is only done if filesystem uses vfs_hash_insert(). Reviewed by: peter Tested by: peter, pho (previous version) Sponsored by: The FreeBSD Foundation MFC after: 5 days Modified: head/sys/kern/vfs_hash.c head/sys/sys/vnode.h Modified: head/sys/kern/vfs_hash.c ============================================================================== --- head/sys/kern/vfs_hash.c Mon Jan 14 05:40:21 2013 (r245405) +++ head/sys/kern/vfs_hash.c Mon Jan 14 05:41:40 2013 (r245406) @@ -54,6 +54,13 @@ vfs_hashinit(void *dummy __unused) /* Must be SI_ORDER_SECOND so desiredvnodes is available */ SYSINIT(vfs_hash, SI_SUB_VFS, SI_ORDER_SECOND, vfs_hashinit, NULL); +u_int +vfs_hash_index(struct vnode *vp) +{ + + return (vp->v_hash + vp->v_mount->mnt_hashseed); +} + static struct vfs_hash_head * vfs_hash_bucket(const struct mount *mp, u_int hash) { Modified: head/sys/sys/vnode.h ============================================================================== --- head/sys/sys/vnode.h Mon Jan 14 05:40:21 2013 (r245405) +++ head/sys/sys/vnode.h Mon Jan 14 05:41:40 2013 (r245406) @@ -812,6 +812,7 @@ int fifo_printinfo(struct vnode *); typedef int vfs_hash_cmp_t(struct vnode *vp, void *arg); int vfs_hash_get(const struct mount *mp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg); +u_int vfs_hash_index(struct vnode *vp); int vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg); void vfs_hash_rehash(struct vnode *vp, u_int hash); void vfs_hash_remove(struct vnode *vp);
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201301140541.r0E5ffTP050675>