[PATCH] NFS: Do not set NFS_INO_INVALID_LABEL unless server supports labeled NFS

Trond Myklebust
2014-02-06T19:53:41Z

Commit aa9c2669626c (NFS: Client implementation of Labeled-NFS) introduces
a performance regression. When nfs_zap_caches_locked is called, it sets
the NFS_INO_INVALID_LABEL flag irrespectively of whether or not the
NFS server supports security labels. Since that flag is never cleared,
it means that all calls to nfs_revalidate_inode() will now trigger
an on-the-wire GETATTR call.

This patch ensures that we never set the NFS_INO_INVALID_LABEL unless the
server advertises support for labeled NFS.
It also causes nfs_setsecurity() to clear NFS_INO_INVALID_LABEL when it
has successfully set the security label for the inode.
Finally it gets rid of the NFS_INO_INVALID_LABEL cruft from nfs_update_inode,
which has nothing to do with labeled NFS.

Reported-by: Neil Brown <neilb@suse.de>
Cc: stable@vger.kernel.org # 3.11+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---

Hi Neil,
Does this fix the GETATTR regression that you reported?

Cheers
Trond

fs/nfs/inode.c | 14 ++++++++++----
fs/nfs/internal.h | 9 +++++++++
2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 29cb93653b3c..4636b828e957 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -169,7 +169,6 @@ static void nfs_zap_caches_locked(struct inode *inode)
if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
nfs_fscache_invalidate(inode);
nfsi->cache_validity |= NFS_INO_INVALID_ATTR
- | NFS_INO_INVALID_LABEL
| NFS_INO_INVALID_DATA
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
@@ -177,10 +176,10 @@ static void nfs_zap_caches_locked(struct inode *inode)
nfs_zap_readdir_cookie(nfsi);
} else
nfsi->cache_validity |= NFS_INO_INVALID_ATTR
- | NFS_INO_INVALID_LABEL
| NFS_INO_INVALID_ACCESS
| NFS_INO_INVALID_ACL
| NFS_INO_REVAL_PAGECACHE;
+ nfs_zap_label_cache_locked(nfsi);
}

void nfs_zap_caches(struct inode *inode)
@@ -272,6 +271,13 @@ nfs_init_locked(struct inode *inode, void *opaque)
}

#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+static void nfs_clear_label_invalid(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
+ spin_unlock(&inode->i_lock);
+}
+
void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
struct nfs4_label *label)
{
@@ -289,6 +295,7 @@ void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
__func__,
(char *)label->label,
label->len, error);
+ nfs_clear_label_invalid(inode);
}
}

@@ -1654,7 +1661,7 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
inode->i_blocks = fattr->du.nfs2.blocks;

/* Update attrtimeo value if we're out of the unstable period */
- if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) {
+ if (invalid & NFS_INO_INVALID_ATTR) {
nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
nfsi->attrtimeo_timestamp = now;
@@ -1667,7 +1674,6 @@ static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
}
}
invalid &= ~NFS_INO_INVALID_ATTR;
- invalid &= ~NFS_INO_INVALID_LABEL;
/* Don't invalidate the data if we were to blame */
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
|| S_ISLNK(inode->i_mode)))
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 8b5cc04a8611..fafdddac8271 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -279,9 +279,18 @@ static inline void nfs4_label_free(struct nfs4_label *label)
}
return;
}
+
+static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
+{
+ if (nfs_server_capable(&nfsi->vfs_inode, NFS_CAP_SECURITY_LABEL))
+ nfsi->cache_validity |= NFS_INO_INVALID_LABEL;
+}
#else
static inline struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) { return NULL; }
static inline void nfs4_label_free(void *label) {}
+static inline void nfs_zap_label_cache_locked(struct nfs_inode *nfsi)
+{
+}
#endif /* CONFIG_NFS_V4_SECURITY_LABEL */

/* proc.c */
--
1.8.5.3