fs-writeback: Add helper function to start writeback if idle

[safe/jmp/linux-2.6] / fs / nfsd / vfs.c

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 04bdba1..7c2e337 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1,7 +1,5 @@
 #define MSNFS  /* HACK HACK */
 /*
- * linux/fs/nfsd/vfs.c
- *
  * File operations used by nfsd. Some of these have been ripped from
  * other parts of the kernel because they weren't exported, others
  * are partial duplicates with added or changed functionality.
@@ -72,12 +70,6 @@ struct raparm_hbucket {
 #define RAPARM_HASH_MASK       (RAPARM_HASH_SIZE-1)
 static struct raparm_hbucket   raparm_hash[RAPARM_HASH_SIZE];
 
-static inline int
-nfsd_v4client(struct svc_rqst *rq)
-{
-    return rq->rq_prog == NFS_PROGRAM && rq->rq_vers == 4;
-}
-
 /* 
  * Called from nfsd_lookup and encode_dirent. Check if we have crossed 
  * a mount point.
@@ -99,8 +91,16 @@ nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp,
 
        exp2 = rqst_exp_get_by_name(rqstp, &path);
        if (IS_ERR(exp2)) {
-               if (PTR_ERR(exp2) != -ENOENT)
-                       err = PTR_ERR(exp2);
+               err = PTR_ERR(exp2);
+               /*
+                * We normally allow NFS clients to continue
+                * "underneath" a mountpoint that is not exported.
+                * The exception is V4ROOT, where no traversal is ever
+                * allowed without an explicit export of the new
+                * directory.
+                */
+               if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT))
+                       err = 0;
                path_put(&path);
                goto out;
        }
@@ -158,6 +158,19 @@ static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, st
        return 0;
 }
 
+/*
+ * For nfsd purposes, we treat V4ROOT exports as though there was an
+ * export at *every* directory.
+ */
+int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp)
+{
+       if (d_mountpoint(dentry))
+               return 1;
+       if (!(exp->ex_flags & NFSEXP_V4ROOT))
+               return 0;
+       return dentry->d_inode != NULL;
+}
+
 __be32
 nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
                   const char *name, unsigned int len,
@@ -203,7 +216,7 @@ nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp,
                /*
                 * check if we have crossed a mount point ...
                 */
-               if (d_mountpoint(dentry)) {
+               if (nfsd_mountpoint(dentry, exp)) {
                        if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) {
                                dput(dentry);
                                goto out_nfserr;
@@ -739,8 +752,6 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
                            flags, current_cred());
        if (IS_ERR(*filp))
                host_err = PTR_ERR(*filp);
-       else
-               ima_counts_get(*filp);
 out_nfserr:
        err = nfserrno(host_err);
 out:
@@ -2119,8 +2130,7 @@ nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp,
         */
        path.mnt = exp->ex_path.mnt;
        path.dentry = dentry;
-       err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC),
-                            IMA_COUNT_LEAVE);
+       err = ima_path_check(&path, acc & (MAY_READ | MAY_WRITE | MAY_EXEC));
 nfsd_out:
        return err? nfserrno(err) : 0;
 }