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| author | Konstantin Belousov <kib@FreeBSD.org> | 2008-12-02 11:14:16 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2008-12-02 11:14:16 +0000 |
| commit | d6568724e10481f07d2ebf26fc8e72fb2e258842 (patch) | |
| tree | d57df84f655910548dc7374f175a80aa821348aa /sys/kern/vfs_cache.c | |
| parent | ffdaeffe217161b6c59f7d80f4db866106dfc2fb (diff) | |
| download | src-d6568724e10481f07d2ebf26fc8e72fb2e258842.tar.gz src-d6568724e10481f07d2ebf26fc8e72fb2e258842.zip | |
Shared lookup makes it possible to create several negative cache
entries for one name. Then, creating inode with that name would remove
one entry, leaving others dormant. Reclaiming the vnode would uncover
negative entries, causing false return of ENOENT from the calls like
stat, that do not create inode.
Prevent creation of the duplicated negative entries.
Reported and debugged with: pho
Reviewed by: jhb
X-MFC: after shared lookup changes
Notes
Notes:
svn path=/head/; revision=185557
Diffstat (limited to 'sys/kern/vfs_cache.c')
| -rw-r--r-- | sys/kern/vfs_cache.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c index d6937b7ca64e..c7f25b99a7fb 100644 --- a/sys/kern/vfs_cache.c +++ b/sys/kern/vfs_cache.c @@ -474,7 +474,7 @@ cache_enter(dvp, vp, cnp) struct vnode *vp; struct componentname *cnp; { - struct namecache *ncp; + struct namecache *ncp, *n2; struct nchashhead *ncpp; u_int32_t hash; int hold; @@ -530,8 +530,6 @@ cache_enter(dvp, vp, cnp) * name. */ if (vp) { - struct namecache *n2; - TAILQ_FOREACH(n2, &vp->v_cache_dst, nc_dst) { if (n2->nc_dvp == dvp && n2->nc_nlen == cnp->cn_namelen && @@ -541,7 +539,16 @@ cache_enter(dvp, vp, cnp) return; } } - } + } else { + TAILQ_FOREACH(n2, &ncneg, nc_dst) { + if (n2->nc_nlen == cnp->cn_namelen && + !bcmp(n2->nc_name, cnp->cn_nameptr, n2->nc_nlen)) { + CACHE_UNLOCK(); + cache_free(ncp); + return; + } + } + } numcache++; if (!vp) { |