nfsd(v2/v3): fix the failure of creation from HPUX client

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

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 6e50aaa..0c07629 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1176,6 +1176,21 @@ nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp,
        return 0;
 }
 
+/* HPUX client sometimes creates a file in mode 000, and sets size to 0.
+ * setting size to 0 may fail for some specific file systems by the permission
+ * checking which requires WRITE permission but the mode is 000.
+ * we ignore the resizing(to 0) on the just new created file, since the size is
+ * 0 after file created.
+ *
+ * call this only after vfs_create() is called.
+ * */
+static void
+nfsd_check_ignore_resizing(struct iattr *iap)
+{
+       if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0))
+               iap->ia_valid &= ~ATTR_SIZE;
+}
+
 /*
  * Create a file (regular, directory, device, fifo); UNIX sockets 
  * not yet implemented.
@@ -1271,6 +1286,8 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
        switch (type) {
        case S_IFREG:
                host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
+               if (!host_err)
+                       nfsd_check_ignore_resizing(iap);
                break;
        case S_IFDIR:
                host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
@@ -1424,6 +1441,8 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
                /* setattr will sync the child (or not) */
        }
 
+       nfsd_check_ignore_resizing(iap);
+
        if (createmode == NFS3_CREATE_EXCLUSIVE) {
                /* Cram the verifier into atime/mtime */
                iap->ia_valid = ATTR_MTIME|ATTR_ATIME