cache: provide a helper for computing the hash
Reviewed by: kib
This commit is contained in:
parent
76583fa294
commit
db709ecbcc
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=294476
@ -310,6 +310,16 @@ static int vn_fullpath1(struct thread *td, struct vnode *vp, struct vnode *rdir,
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static MALLOC_DEFINE(M_VFSCACHE, "vfscache", "VFS name cache entries");
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static uint32_t
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cache_get_hash(char *name, u_char len, struct vnode *dvp)
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{
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uint32_t hash;
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hash = fnv_32_buf(name, len, FNV1_32_INIT);
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hash = fnv_32_buf(&dvp, sizeof(dvp), hash);
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return (hash);
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}
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static int
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sysctl_nchstats(SYSCTL_HANDLER_ARGS)
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{
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@ -554,8 +564,7 @@ cache_lookup(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp,
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}
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}
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hash = fnv_32_buf(cnp->cn_nameptr, cnp->cn_namelen, FNV1_32_INIT);
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hash = fnv_32_buf(&dvp, sizeof(dvp), hash);
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hash = cache_get_hash(cnp->cn_nameptr, cnp->cn_namelen, dvp);
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LIST_FOREACH(ncp, (NCHHASH(hash)), nc_hash) {
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counter_u64_add(numchecks, 1);
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if (ncp->nc_dvp == dvp && ncp->nc_nlen == cnp->cn_namelen &&
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@ -799,9 +808,8 @@ cache_enter_time(struct vnode *dvp, struct vnode *vp, struct componentname *cnp,
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}
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}
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len = ncp->nc_nlen = cnp->cn_namelen;
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hash = fnv_32_buf(cnp->cn_nameptr, len, FNV1_32_INIT);
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hash = cache_get_hash(cnp->cn_nameptr, len, dvp);
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strlcpy(nc_get_name(ncp), cnp->cn_nameptr, len + 1);
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hash = fnv_32_buf(&dvp, sizeof(dvp), hash);
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CACHE_WLOCK();
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/*
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@ -980,10 +988,8 @@ cache_changesize(int newmaxvnodes)
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nchash = new_nchash;
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for (i = 0; i <= old_nchash; i++) {
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while ((ncp = LIST_FIRST(&old_nchashtbl[i])) != NULL) {
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hash = fnv_32_buf(nc_get_name(ncp), ncp->nc_nlen,
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FNV1_32_INIT);
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hash = fnv_32_buf(&ncp->nc_dvp, sizeof(ncp->nc_dvp),
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hash);
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hash = cache_get_hash(nc_get_name(ncp), ncp->nc_nlen,
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ncp->nc_dvp);
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LIST_REMOVE(ncp, nc_hash);
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LIST_INSERT_HEAD(NCHHASH(hash), ncp, nc_hash);
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}
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