diff options
| -rw-r--r-- | sys/ufs/ufs/dirhash.h | 1 | ||||
| -rw-r--r-- | sys/ufs/ufs/ufs_dirhash.c | 32 |
2 files changed, 15 insertions, 18 deletions
diff --git a/sys/ufs/ufs/dirhash.h b/sys/ufs/ufs/dirhash.h index e5978b411d94..91f6a1769666 100644 --- a/sys/ufs/ufs/dirhash.h +++ b/sys/ufs/ufs/dirhash.h @@ -98,7 +98,6 @@ struct dirhash { int dh_dirblks; /* number of DIRBLKSIZ blocks in dir */ int dh_firstfree[DH_NFSTATS + 1]; /* first blk with N words free */ - int dh_seqopt; /* sequential access optimisation enabled */ doff_t dh_seqoff; /* sequential access optimisation offset */ int dh_score; /* access count for this dirhash */ diff --git a/sys/ufs/ufs/ufs_dirhash.c b/sys/ufs/ufs/ufs_dirhash.c index 9c8968995a56..0f4e3aa2d258 100644 --- a/sys/ufs/ufs/ufs_dirhash.c +++ b/sys/ufs/ufs/ufs_dirhash.c @@ -402,8 +402,7 @@ ufsdirhash_build(struct inode *ip) dh->dh_firstfree[i] = -1; dh->dh_firstfree[DH_NFSTATS] = 0; dh->dh_hused = 0; - dh->dh_seqopt = 0; - dh->dh_seqoff = 0; + dh->dh_seqoff = -1; dh->dh_score = DH_SCOREINIT; dh->dh_lastused = time_second; @@ -551,7 +550,7 @@ ufsdirhash_lookup(struct inode *ip, char *name, int namelen, doff_t *offp, struct direct *dp; struct vnode *vp; struct buf *bp; - doff_t blkoff, bmask, offset, prevoff; + doff_t blkoff, bmask, offset, prevoff, seqoff; int i, slot; int error; @@ -591,29 +590,30 @@ ufsdirhash_lookup(struct inode *ip, char *name, int namelen, doff_t *offp, bmask = VFSTOUFS(vp->v_mount)->um_mountp->mnt_stat.f_iosize - 1; blkoff = -1; bp = NULL; + seqoff = dh->dh_seqoff; restart: slot = ufsdirhash_hash(dh, name, namelen); - if (dh->dh_seqopt) { + if (seqoff != -1) { /* - * Sequential access optimisation. dh_seqoff contains the + * Sequential access optimisation. seqoff contains the * offset of the directory entry immediately following * the last entry that was looked up. Check if this offset * appears in the hash chain for the name we are looking for. */ for (i = slot; (offset = DH_ENTRY(dh, i)) != DIRHASH_EMPTY; i = WRAPINCR(i, dh->dh_hlen)) - if (offset == dh->dh_seqoff) + if (offset == seqoff) break; - if (offset == dh->dh_seqoff) { + if (offset == seqoff) { /* * We found an entry with the expected offset. This * is probably the entry we want, but if not, the - * code below will turn off seqopt and retry. + * code below will retry. */ slot = i; - } else - dh->dh_seqopt = 0; + } else + seqoff = -1; } for (; (offset = DH_ENTRY(dh, slot)) != DIRHASH_EMPTY; @@ -655,9 +655,7 @@ restart: *prevoffp = prevoff; } - /* Check for sequential access, and update offset. */ - if (dh->dh_seqopt == 0 && dh->dh_seqoff == offset) - dh->dh_seqopt = 1; + /* Update offset. */ dh->dh_seqoff = offset + DIRSIZ(0, dp); *bpp = bp; *offp = offset; @@ -666,11 +664,11 @@ restart: } /* - * When the name doesn't match in the seqopt case, go back - * and search normally. + * When the name doesn't match in the sequential + * optimization case, go back and search normally. */ - if (dh->dh_seqopt) { - dh->dh_seqopt = 0; + if (seqoff != -1) { + seqoff = -1; goto restart; } } |