[PATCH] nfsd: check error status from nfsd_sync_dir

Change nfsd_sync_dir to return an error if ->sync fails, and pass that error
up through the stack.  This involves a number of rearrangements of error
paths, and care to distinguish between Linux -errno numbers and NFSERR
numbers.

In the 'create' routines, we continue with the 'setattr' even if a previous
sync_dir failed.

This patch is quite different from Takashi's in a few ways, but there is still
a strong lineage.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 45 insertions, 37 deletions

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index eef0576a7785..acf637869ccf 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -710,14 +710,15 @@ static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
 {
         struct inode *inode = dp->d_inode;
         int (*fsync) (struct file *, struct dentry *, int);
-        int err = nfs_ok;
+        int err;
 
-        filemap_fdatawrite(inode->i_mapping);
-        if (fop && (fsync = fop->fsync))
-                err=fsync(filp, dp, 0);
-        filemap_fdatawait(inode->i_mapping);
+        err = filemap_fdatawrite(inode->i_mapping);
+        if (err == 0 && fop && (fsync = fop->fsync))
+                err = fsync(filp, dp, 0);
+        if (err == 0)
+                err = filemap_fdatawait(inode->i_mapping);
 
-        return nfserrno(err);
+        return err;
 }
         
 
@@ -734,10 +735,10 @@ nfsd_sync(struct file *filp)
         return err;
 }
 
-void
+int
 nfsd_sync_dir(struct dentry *dp)
 {
-        nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
+        return nfsd_dosync(NULL, dp, dp->d_inode->i_fop);
 }
 
 /*
@@ -1065,6 +1066,7 @@ nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp,
         if (EX_ISSYNC(fhp->fh_export)) {
                 if (file->f_op && file->f_op->fsync) {
                         err = nfsd_sync(file);
+                        err = nfserrno(err);
                 } else {
                         err = nfserr_notsupp;
                 }
@@ -1175,7 +1177,7 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
                 goto out_nfserr;
 
         if (EX_ISSYNC(fhp->fh_export)) {
-                nfsd_sync_dir(dentry);
+                err = nfsd_sync_dir(dentry);
                 write_inode_now(dchild->d_inode, 1);
         }
 
@@ -1185,9 +1187,11 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
          * send along the gid when it tries to implement setgid
          * directories via NFS.
          */
-        err = 0;
-        if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0)
-                err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+        if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) {
+                int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+                if (err2)
+                        err = err2;
+        }
         /*
          * Update the file handle to get the new inode info.
          */
@@ -1306,17 +1310,12 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
                 goto out_nfserr;
 
         if (EX_ISSYNC(fhp->fh_export)) {
-                nfsd_sync_dir(dentry);
+                err = nfsd_sync_dir(dentry);
+                if (err)
+                        err = nfserrno(err);
                 /* setattr will sync the child (or not) */
         }
 
-        /*
-         * Update the filehandle to get the new inode info.
-         */
-        err = fh_update(resfhp);
-        if (err)
-                goto out;
-
         if (createmode == NFS3_CREATE_EXCLUSIVE) {
                 /* Cram the verifier into atime/mtime/mode */
                 iap->ia_valid = ATTR_MTIME|ATTR_ATIME
@@ -1337,8 +1336,17 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
          * implement setgid directories via NFS. Clear out all that cruft.
          */
  set_attr:
-        if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0)
-                err = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+        if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID)) != 0) {
+                int err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0);
+                if (err2)
+                        err = nfserrno(err2);
+        }
+
+        /*
+         * Update the filehandle to get the new inode info.
+         */
+        if (!err)
+                err = fh_update(resfhp);
 
  out:
         fh_unlock(fhp);
@@ -1447,10 +1455,10 @@ nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
         } else
                 err = vfs_symlink(dentry->d_inode, dnew, path, mode);
 
-        if (!err) {
+        if (!err)
                 if (EX_ISSYNC(fhp->fh_export))
-                        nfsd_sync_dir(dentry);
-        } else
+                        err = nfsd_sync_dir(dentry);
+        if (err)
                 err = nfserrno(err);
         fh_unlock(fhp);
 
@@ -1506,8 +1514,10 @@ nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
         err = vfs_link(dold, dirp, dnew);
         if (!err) {
                 if (EX_ISSYNC(ffhp->fh_export)) {
-                        nfsd_sync_dir(ddir);
+                        err = nfsd_sync_dir(ddir);
                         write_inode_now(dest, 1);
+                        if (err)
+                                err = nfserrno(err);
                 }
         } else {
                 if (err == -EXDEV && rqstp->rq_vers == 2)
@@ -1595,8 +1605,9 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
 #endif
         err = vfs_rename(fdir, odentry, tdir, ndentry);
         if (!err && EX_ISSYNC(tfhp->fh_export)) {
-                nfsd_sync_dir(tdentry);
-                nfsd_sync_dir(fdentry);
+                err = nfsd_sync_dir(tdentry);
+                if (!err)
+                        err = nfsd_sync_dir(fdentry);
         }
 
  out_dput_new:
@@ -1671,17 +1682,14 @@ nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 
         dput(rdentry);
 
-        if (err)
-                goto out_nfserr;
-        if (EX_ISSYNC(fhp->fh_export)) 
-                nfsd_sync_dir(dentry);
-
-out:
-        return err;
+        if (err == 0 &&
+            EX_ISSYNC(fhp->fh_export))
+                        err = nfsd_sync_dir(dentry);
 
 out_nfserr:
         err = nfserrno(err);
-        goto out;
+out:
+        return err;
 }
 
 /*
diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index 51c231a1e5a6..ec7c2e872d72 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -124,7 +124,7 @@ int		nfsd_statfs(struct svc_rqst *, struct svc_fh *,
 
 int             nfsd_notify_change(struct inode *, struct iattr *);
 int             nfsd_permission(struct svc_export *, struct dentry *, int);
-void            nfsd_sync_dir(struct dentry *dp);
+int             nfsd_sync_dir(struct dentry *dp);
 
 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
 #ifdef CONFIG_NFSD_V2_ACL