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Expand the per-node access cache to cache permissions for multiple users.
The number of entries in the cache defaults to 8 but is easily changed in nfsclient/nfs.h. When the cache is filled, the oldest cache entry is evicted when space is needed. I mirrored the changes to the NFSv[23] client in the NFSv4 client to fix compile breakage. However, the NFSv4 client doesn't actually use the access cache currently. Submitted by: rmacklem
This commit is contained in:
John Baldwin
parent
ab42e8b2df
commit
2a3f3a09c6
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=190176
@ -241,11 +241,11 @@ SYSCTL_INT(_vfs_nfs4, OID_AUTO, access_cache_misses, CTLFLAG_RD,
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| NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP)
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static int
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nfs4_v3_access_otw(struct vnode *vp, int wmode, struct thread *td,
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struct ucred *cred)
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struct ucred *cred, uint32_t *retmode)
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{
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const int v3 = 1;
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u_int32_t *tl;
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int error = 0, attrflag;
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int error = 0, attrflag, i, lrupos;
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return (0);
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@ -264,11 +264,26 @@ nfs4_v3_access_otw(struct vnode *vp, int wmode, struct thread *td,
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nfsm_request(vp, NFSPROC_ACCESS, td, cred);
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nfsm_postop_attr(vp, attrflag);
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if (!error) {
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lrupos = 0;
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tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
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rmode = fxdr_unsigned(u_int32_t, *tl);
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np->n_mode = rmode;
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np->n_modeuid = cred->cr_uid;
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np->n_modestamp = time_second;
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
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if (np->n_accesscache[i].uid == cred->cr_uid) {
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np->n_accesscache[i].mode = rmode;
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np->n_accesscache[i].stamp = time_second;
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break;
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}
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if (i > 0 && np->n_accesscache[i].stamp <
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np->n_accesscache[lrupos].stamp)
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lrupos = i;
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}
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if (i == NFS_ACCESSCACHESIZE) {
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np->n_accesscache[lrupos].uid = cred->cr_uid;
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np->n_accesscache[lrupos].mode = rmode;
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np->n_accesscache[lrupos].stamp = time_second;
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}
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if (retmode != NULL)
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*retmode = rmode;
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}
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m_freem(mrep);
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nfsmout:
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@ -285,8 +300,8 @@ static int
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nfs4_access(struct vop_access_args *ap)
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{
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struct vnode *vp = ap->a_vp;
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int error = 0;
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u_int32_t mode, wmode;
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int error = 0, i, gotahit;
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u_int32_t mode, rmode, wmode;
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int v3 = NFS_ISV3(vp); /* v3 \in v4 */
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struct nfsnode *np = VTONFS(vp);
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caddr_t bpos, dpos;
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@ -350,19 +365,27 @@ nfs4_access(struct vop_access_args *ap)
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* Does our cached result allow us to give a definite yes to
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* this request?
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*/
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if (time_second < np->n_modestamp + nfs4_access_cache_timeout &&
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ap->a_cred->cr_uid == np->n_modeuid &&
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(np->n_mode & mode) == mode) {
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nfsstats.accesscache_hits++;
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} else {
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gotahit = 0;
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
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if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
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if (time_second < (np->n_accesscache[i].stamp +
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nfs4_access_cache_timeout) &&
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(np->n_accesscache[i].mode & mode) == mode) {
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nfsstats.accesscache_hits++;
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gotahit = 1;
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}
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break;
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}
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}
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if (gotahit == 0) {
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/*
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* Either a no, or a don't know. Go to the wire.
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*/
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nfsstats.accesscache_misses++;
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error = nfs4_v3_access_otw(vp, wmode, ap->a_td,
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ap->a_cred);
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ap->a_cred, &rmode);
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if (error == 0) {
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if ((np->n_mode & mode) != mode)
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if ((rmode & mode) != mode)
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error = EACCES;
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}
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}
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@ -68,6 +68,9 @@
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#ifndef NFS_MAXDIRATTRTIMO
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#define NFS_MAXDIRATTRTIMO 60
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#endif
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#ifndef NFS_ACCESSCACHESIZE
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#define NFS_ACCESSCACHESIZE 8 /* Per-node access cache entries */
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#endif
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#define NFS_WSIZE 8192 /* Def. write data size <= 8192 */
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#define NFS_RSIZE 8192 /* Def. read data size <= 8192 */
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#define NFS_READDIRSIZE 8192 /* Def. readdir size */
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@ -270,11 +270,11 @@ SYSCTL_INT(_vfs_nfs, OID_AUTO, access_cache_misses, CTLFLAG_RD,
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static int
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nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
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struct ucred *cred)
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struct ucred *cred, uint32_t *retmode)
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{
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const int v3 = 1;
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u_int32_t *tl;
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int error = 0, attrflag;
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int error = 0, attrflag, i, lrupos;
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struct mbuf *mreq, *mrep, *md, *mb;
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caddr_t bpos, dpos;
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@ -291,13 +291,28 @@ nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td,
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nfsm_request(vp, NFSPROC_ACCESS, td, cred);
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nfsm_postop_attr(vp, attrflag);
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if (!error) {
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lrupos = 0;
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tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED);
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rmode = fxdr_unsigned(u_int32_t, *tl);
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mtx_lock(&np->n_mtx);
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np->n_mode = rmode;
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np->n_modeuid = cred->cr_uid;
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np->n_modestamp = time_second;
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
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if (np->n_accesscache[i].uid == cred->cr_uid) {
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np->n_accesscache[i].mode = rmode;
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np->n_accesscache[i].stamp = time_second;
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break;
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}
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if (i > 0 && np->n_accesscache[i].stamp <
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np->n_accesscache[lrupos].stamp)
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lrupos = i;
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}
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if (i == NFS_ACCESSCACHESIZE) {
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np->n_accesscache[lrupos].uid = cred->cr_uid;
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np->n_accesscache[lrupos].mode = rmode;
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np->n_accesscache[lrupos].stamp = time_second;
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}
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mtx_unlock(&np->n_mtx);
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if (retmode != NULL)
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*retmode = rmode;
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}
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m_freem(mrep);
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nfsmout:
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@ -314,8 +329,8 @@ static int
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nfs_access(struct vop_access_args *ap)
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{
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struct vnode *vp = ap->a_vp;
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int error = 0;
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u_int32_t mode, wmode;
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int error = 0, i, gotahit;
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u_int32_t mode, rmode, wmode;
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int v3 = NFS_ISV3(vp);
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struct nfsnode *np = VTONFS(vp);
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@ -372,26 +387,32 @@ nfs_access(struct vop_access_args *ap)
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* Does our cached result allow us to give a definite yes to
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* this request?
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*/
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gotahit = 0;
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mtx_lock(&np->n_mtx);
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if ((time_second < (np->n_modestamp + nfsaccess_cache_timeout)) &&
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(ap->a_cred->cr_uid == np->n_modeuid) &&
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((np->n_mode & mode) == mode)) {
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nfsstats.accesscache_hits++;
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} else {
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++) {
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if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) {
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if (time_second < (np->n_accesscache[i].stamp +
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nfsaccess_cache_timeout) &&
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(np->n_accesscache[i].mode & mode) == mode) {
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nfsstats.accesscache_hits++;
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gotahit = 1;
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}
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break;
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}
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}
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mtx_unlock(&np->n_mtx);
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if (gotahit == 0) {
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/*
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* Either a no, or a don't know. Go to the wire.
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*/
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nfsstats.accesscache_misses++;
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mtx_unlock(&np->n_mtx);
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error = nfs3_access_otw(vp, wmode, ap->a_td,ap->a_cred);
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mtx_lock(&np->n_mtx);
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error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred,
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&rmode);
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if (!error) {
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if ((np->n_mode & mode) != mode) {
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if ((rmode & mode) != mode)
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error = EACCES;
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}
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}
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}
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mtx_unlock(&np->n_mtx);
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return (error);
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} else {
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if ((error = nfsspec_access(ap)) != 0) {
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@ -651,7 +672,7 @@ nfs_getattr(struct vop_getattr_args *ap)
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goto nfsmout;
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if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) {
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nfsstats.accesscache_misses++;
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nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred);
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nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL);
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if (nfs_getattrcache(vp, &vattr) == 0)
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goto nfsmout;
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}
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@ -810,7 +831,7 @@ nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred)
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struct nfsnode *np = VTONFS(vp);
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caddr_t bpos, dpos;
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u_int32_t *tl;
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int error = 0, wccflag = NFSV3_WCCRATTR;
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int error = 0, i, wccflag = NFSV3_WCCRATTR;
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struct mbuf *mreq, *mrep, *md, *mb;
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int v3 = NFS_ISV3(vp);
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@ -843,7 +864,10 @@ nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred)
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}
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nfsm_request(vp, NFSPROC_SETATTR, curthread, cred);
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if (v3) {
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np->n_modestamp = 0;
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mtx_lock(&np->n_mtx);
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for (i = 0; i < NFS_ACCESSCACHESIZE; i++)
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np->n_accesscache[i].stamp = 0;
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mtx_unlock(&np->n_mtx);
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nfsm_wcc_data(vp, wccflag);
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} else
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nfsm_loadattr(vp, NULL);
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@ -84,6 +84,12 @@ struct nfs_attrcache_timestamp {
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unsigned long nfs_ac_ts_syscalls;
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};
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struct nfs_accesscache {
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u_int32_t mode; /* ACCESS mode cache */
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uid_t uid; /* credentials having mode */
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time_t stamp; /* mode cache timestamp */
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};
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/*
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* The nfsnode is the nfs equivalent to ufs's inode. Any similarity
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* is purely coincidental.
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@ -104,9 +110,7 @@ struct nfsnode {
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u_quad_t n_lrev; /* Modify rev for lease */
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struct vattr n_vattr; /* Vnode attribute cache */
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time_t n_attrstamp; /* Attr. cache timestamp */
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u_int32_t n_mode; /* ACCESS mode cache */
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uid_t n_modeuid; /* credentials having mode */
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time_t n_modestamp; /* mode cache timestamp */
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struct nfs_accesscache n_accesscache[NFS_ACCESSCACHESIZE];
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struct timespec n_mtime; /* Prev modify time. */
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time_t n_ctime; /* Prev create time. */
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time_t n_dmtime; /* Prev dir modify time. */
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