From: Trond Myklebust <trond.myklebust@primarydata.com>
To: Benjamin Coddington <bcodding@redhat.com>
Cc: linux-nfs@vger.kernel.org
Subject: [PATCH v2 3/3] NFS: Allow getattr to also report readdirplus cache hits
Date: Fri, 2 Dec 2016 09:21:35 -0500 [thread overview]
Message-ID: <20161202142135.11515-4-trond.myklebust@primarydata.com> (raw)
In-Reply-To: <20161202142135.11515-3-trond.myklebust@primarydata.com>
If the use called stat() on an 'ls -l' workload, and the attribute
cache was successfully revalidate by READDIRPLUS, then we want to
report that back so that the readdir code continues to use
readdirplus.
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
---
fs/nfs/dir.c | 1 -
fs/nfs/inode.c | 21 +++++++++++++++++----
fs/nfs/internal.h | 1 +
3 files changed, 18 insertions(+), 5 deletions(-)
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 22835150579a..f5702457c052 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -459,7 +459,6 @@ bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx)
* use of readdirplus to accelerate any future lookups in the same
* directory.
*/
-static
void nfs_advise_use_readdirplus(struct inode *dir)
{
struct nfs_inode *nfsi = NFS_I(dir);
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index d79e0bac836e..75f5a9cb2e66 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -634,15 +634,28 @@ void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
}
EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
-static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
+static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
{
struct dentry *parent;
+ if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
+ return;
parent = dget_parent(dentry);
nfs_force_use_readdirplus(d_inode(parent));
dput(parent);
}
+static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
+{
+ struct dentry *parent;
+
+ if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
+ return;
+ parent = dget_parent(dentry);
+ nfs_advise_use_readdirplus(d_inode(parent));
+ dput(parent);
+}
+
static bool nfs_need_revalidate_inode(struct inode *inode)
{
if (NFS_I(inode)->cache_validity &
@@ -683,10 +696,10 @@ int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
if (need_atime || nfs_need_revalidate_inode(inode)) {
struct nfs_server *server = NFS_SERVER(inode);
- if (server->caps & NFS_CAP_READDIRPLUS)
- nfs_request_parent_use_readdirplus(dentry);
+ nfs_readdirplus_parent_cache_miss(dentry);
err = __nfs_revalidate_inode(server, inode);
- }
+ } else
+ nfs_readdirplus_parent_cache_hit(dentry);
if (!err) {
generic_fillattr(inode, stat);
stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 4622d5f18e35..6b79c2ca9b9a 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -344,6 +344,7 @@ extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
const struct nfs_client_initdata *);
/* dir.c */
+extern void nfs_advise_use_readdirplus(struct inode *dir);
extern void nfs_force_use_readdirplus(struct inode *dir);
extern unsigned long nfs_access_cache_count(struct shrinker *shrink,
struct shrink_control *sc);
--
2.9.3
next prev parent reply other threads:[~2016-12-02 14:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-02 14:21 [PATCH v2 0/3] Readdirplus performance improvements for 4.10 Trond Myklebust
2016-12-02 14:21 ` [PATCH v2 1/3] NFS: Fix a performance regression in readdir Trond Myklebust
2016-12-02 14:21 ` [PATCH v2 2/3] NFS: Be more targeted about readdirplus use when doing lookup/revalidation Trond Myklebust
2016-12-02 14:21 ` Trond Myklebust [this message]
2016-12-02 15:42 ` [PATCH v2 0/3] Readdirplus performance improvements for 4.10 Benjamin Coddington
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