nfsd: allow turning off nfsv3 readdir_plus

One of our customer's application only needs file names, not file
attributes. With directories having 10K+ inodes (assuming buffer cache
has directory blocks cached having file names, but inode cache is
limited and hence need eviction of older cached inodes), older inodes
are evicted periodically. So if they keep on doing readdir(2) from NSF
client on multiple directories, some directory's files are periodically
removed from inode cache and hence new readdir(2) on same directory
requires disk access to bring back inodes again to inode cache.

As READDIRPLUS request fetches attributes also, doing getattr on each
file on server, it causes unnecessary disk accesses. If READDIRPLUS on
NFS client is returned with -ENOTSUPP, NFS client uses READDIR request
which just gets the names of the files in a directory, not attributes,
hence avoiding disk accesses on server.

There's already a corresponding client-side mount option, but an export
option reduces the need for configuration across multiple clients.

This flag affects NFSv3 only.  If it turns out it's needed for NFSv4 as
well then we may have to figure out how to extend the behavior to NFSv4,
but it's not currently obvious how to do that.

Signed-off-by: Rajesh Ghanekar <rajesh_ghanekar@symantec.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 72ffd7c..30a739d 100644 (file)
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1145,6 +1145,7 @@ static struct flags {
        { NFSEXP_ALLSQUASH, {"all_squash", ""}},
        { NFSEXP_ASYNC, {"async", "sync"}},
        { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
+       { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
        { NFSEXP_NOHIDE, {"nohide", ""}},
        { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
        { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},

diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
index fc51f7f..12f2aab 100644 (file)
--- a/fs/nfsd/nfs3proc.c
+++ b/fs/nfsd/nfs3proc.c
@@ -466,6 +466,14 @@ nfsd3_proc_readdirplus(struct svc_rqst *rqstp, struct nfsd3_readdirargs *argp,
        resp->buflen = resp->count;
        resp->rqstp = rqstp;
        offset = argp->cookie;
+
+       nfserr = fh_verify(rqstp, &resp->fh, S_IFDIR, NFSD_MAY_NOP);
+       if (nfserr)
+               RETURN_STATUS(nfserr);
+
+       if (resp->fh.fh_export->ex_flags & NFSEXP_NOREADDIRPLUS)
+               RETURN_STATUS(nfserr_notsupp);
+
        nfserr = nfsd_readdir(rqstp, &resp->fh,
                                     &offset,
                                     &resp->common,

diff --git a/include/uapi/linux/nfsd/export.h b/include/uapi/linux/nfsd/export.h
index cf47c31..584b6ef 100644 (file)
--- a/include/uapi/linux/nfsd/export.h
+++ b/include/uapi/linux/nfsd/export.h
@@ -28,7 +28,8 @@
 #define NFSEXP_ALLSQUASH       0x0008
 #define NFSEXP_ASYNC           0x0010
 #define NFSEXP_GATHERED_WRITES 0x0020
-/* 40 80 100 currently unused */
+#define NFSEXP_NOREADDIRPLUS    0x0040
+/* 80 100 currently unused */
 #define NFSEXP_NOHIDE          0x0200
 #define NFSEXP_NOSUBTREECHECK  0x0400
 #define        NFSEXP_NOAUTHNLM        0x0800          /* Don't authenticate NLM requests - just trust */
@@ -47,7 +48,7 @@
  */
 #define        NFSEXP_V4ROOT           0x10000
 /* All flags that we claim to support.  (Note we don't support NOACL.) */
-#define NFSEXP_ALLFLAGS                0x17E3F
+#define NFSEXP_ALLFLAGS                0x1FE7F
 
 /* The flags that may vary depending on security flavor: */
 #define NFSEXP_SECINFO_FLAGS   (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \