diff options
Diffstat (limited to 'sys/fs/nfsserver/nfs_nfsdport.c')
-rw-r--r-- | sys/fs/nfsserver/nfs_nfsdport.c | 121 |
1 files changed, 69 insertions, 52 deletions
diff --git a/sys/fs/nfsserver/nfs_nfsdport.c b/sys/fs/nfsserver/nfs_nfsdport.c index f30d051..9fdb569 100644 --- a/sys/fs/nfsserver/nfs_nfsdport.c +++ b/sys/fs/nfsserver/nfs_nfsdport.c @@ -90,20 +90,78 @@ SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW, SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW, &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files"); -#define NUM_HEURISTIC 1017 +#define MAX_REORDERED_RPC 16 +#define NUM_HEURISTIC 1031 #define NHUSE_INIT 64 #define NHUSE_INC 16 #define NHUSE_MAX 2048 static struct nfsheur { struct vnode *nh_vp; /* vp to match (unreferenced pointer) */ - off_t nh_nextr; /* next offset for sequential detection */ + off_t nh_nextoff; /* next offset for sequential detection */ int nh_use; /* use count for selection */ int nh_seqcount; /* heuristic */ } nfsheur[NUM_HEURISTIC]; /* + * Heuristic to detect sequential operation. + */ +static struct nfsheur * +nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp) +{ + struct nfsheur *nh; + int hi, try; + + /* Locate best candidate. */ + try = 32; + hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC; + nh = &nfsheur[hi]; + while (try--) { + if (nfsheur[hi].nh_vp == vp) { + nh = &nfsheur[hi]; + break; + } + if (nfsheur[hi].nh_use > 0) + --nfsheur[hi].nh_use; + hi = (hi + 1) % NUM_HEURISTIC; + if (nfsheur[hi].nh_use < nh->nh_use) + nh = &nfsheur[hi]; + } + + /* Initialize hint if this is a new file. */ + if (nh->nh_vp != vp) { + nh->nh_vp = vp; + nh->nh_nextoff = uio->uio_offset; + nh->nh_use = NHUSE_INIT; + if (uio->uio_offset == 0) + nh->nh_seqcount = 4; + else + nh->nh_seqcount = 1; + } + + /* Calculate heuristic. */ + if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) || + uio->uio_offset == nh->nh_nextoff) { + /* See comments in vfs_vnops.c:sequential_heuristic(). */ + nh->nh_seqcount += howmany(uio->uio_resid, 16384); + if (nh->nh_seqcount > IO_SEQMAX) + nh->nh_seqcount = IO_SEQMAX; + } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC * + imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) { + /* Probably a reordered RPC, leave seqcount alone. */ + } else if (nh->nh_seqcount > 1) { + nh->nh_seqcount /= 2; + } else { + nh->nh_seqcount = 0; + } + nh->nh_use += NHUSE_INC; + if (nh->nh_use > NHUSE_MAX) + nh->nh_use = NHUSE_MAX; + return (nh); +} + +/* * Get attributes into nfsvattr structure. */ int @@ -567,60 +625,11 @@ nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred, int i; struct iovec *iv; struct iovec *iv2; - int error = 0, len, left, siz, tlen, ioflag = 0, hi, try = 32; + int error = 0, len, left, siz, tlen, ioflag = 0; struct mbuf *m2 = NULL, *m3; struct uio io, *uiop = &io; struct nfsheur *nh; - /* - * Calculate seqcount for heuristic - */ - /* - * Locate best candidate - */ - - hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC; - nh = &nfsheur[hi]; - - while (try--) { - if (nfsheur[hi].nh_vp == vp) { - nh = &nfsheur[hi]; - break; - } - if (nfsheur[hi].nh_use > 0) - --nfsheur[hi].nh_use; - hi = (hi + 1) % NUM_HEURISTIC; - if (nfsheur[hi].nh_use < nh->nh_use) - nh = &nfsheur[hi]; - } - - if (nh->nh_vp != vp) { - nh->nh_vp = vp; - nh->nh_nextr = off; - nh->nh_use = NHUSE_INIT; - if (off == 0) - nh->nh_seqcount = 4; - else - nh->nh_seqcount = 1; - } - - /* - * Calculate heuristic - */ - - if ((off == 0 && nh->nh_seqcount > 0) || off == nh->nh_nextr) { - if (++nh->nh_seqcount > IO_SEQMAX) - nh->nh_seqcount = IO_SEQMAX; - } else if (nh->nh_seqcount > 1) { - nh->nh_seqcount = 1; - } else { - nh->nh_seqcount = 0; - } - nh->nh_use += NHUSE_INC; - if (nh->nh_use > NHUSE_MAX) - nh->nh_use = NHUSE_MAX; - ioflag |= nh->nh_seqcount << IO_SEQSHIFT; - len = left = NFSM_RNDUP(cnt); m3 = NULL; /* @@ -665,6 +674,8 @@ nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred, uiop->uio_resid = len; uiop->uio_rw = UIO_READ; uiop->uio_segflg = UIO_SYSSPACE; + nh = nfsrv_sequential_heuristic(uiop, vp); + ioflag |= nh->nh_seqcount << IO_SEQSHIFT; error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred); FREE((caddr_t)iv2, M_TEMP); if (error) { @@ -672,6 +683,7 @@ nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred, *mpp = NULL; goto out; } + nh->nh_nextoff = uiop->uio_offset; tlen = len - uiop->uio_resid; cnt = cnt < tlen ? cnt : tlen; tlen = NFSM_RNDUP(cnt); @@ -700,6 +712,7 @@ nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable, struct iovec *iv; int ioflags, error; struct uio io, *uiop = &io; + struct nfsheur *nh; MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP, M_WAITOK); @@ -733,7 +746,11 @@ nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable, uiop->uio_segflg = UIO_SYSSPACE; NFSUIOPROC(uiop, p); uiop->uio_offset = off; + nh = nfsrv_sequential_heuristic(uiop, vp); + ioflags |= nh->nh_seqcount << IO_SEQSHIFT; error = VOP_WRITE(vp, uiop, ioflags, cred); + if (error == 0) + nh->nh_nextoff = uiop->uio_offset; FREE((caddr_t)iv, M_TEMP); NFSEXITCODE(error); |