diff options
Diffstat (limited to 'sys/kern/vfs_cache.c')
| -rw-r--r-- | sys/kern/vfs_cache.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c index 6faebdb9279e..33fc4f0ef059 100644 --- a/sys/kern/vfs_cache.c +++ b/sys/kern/vfs_cache.c @@ -370,8 +370,10 @@ cache_lookup(dvp, vpp, cnp) numneghits++; /* - * We found a "negative" match, ENOENT notifies client of this match. - * The nc_vpid field records whether this is a whiteout. + * We found a "negative" match, so we shift it to the end of + * the "negative" cache entries queue to satisfy LRU. Also, + * check to see if the entry is a whiteout; indicate this to + * the componentname, if so. */ TAILQ_REMOVE(&ncneg, ncp, nc_dst); TAILQ_INSERT_TAIL(&ncneg, ncp, nc_dst); @@ -427,10 +429,9 @@ cache_enter(dvp, vp, cnp) } /* - * Fill in cache info, if vp is NULL this is a "negative" cache entry. - * For negative entries, we have to record whether it is a whiteout. - * the whiteout flag is stored in the nc_vpid field which is - * otherwise unused. + * Set the rest of the namecache entry elements, calculate it's + * hash key and insert it into the appropriate chain within + * the cache entries table. */ ncp->nc_vp = vp; ncp->nc_dvp = dvp; @@ -445,6 +446,11 @@ cache_enter(dvp, vp, cnp) numcachehv++; } LIST_INSERT_HEAD(&dvp->v_cache_src, ncp, nc_src); + /* + * If the entry is "negative", we place it into the + * "negative" cache queue, otherwise, we place it into the + * destination vnode's cache entries queue. + */ if (vp) { TAILQ_INSERT_HEAD(&vp->v_cache_dst, ncp, nc_dst); } else { |