1 files changed, 47 insertions, 78 deletions

diff --git a/fs/orangefs/file.c b/fs/orangefs/file.c
index 0d228cd..26358ef 100644
--- a/fs/orangefs/file.c
+++ b/fs/orangefs/file.c
@@ -42,70 +42,6 @@ static int flush_racache(struct inode *inode)
 }
 
 /*
- * Copy to client-core's address space from the buffers specified
- * by the iovec upto total_size bytes.
- * NOTE: the iovector can either contain addresses which
- *       can futher be kernel-space or user-space addresses.
- *       or it can pointers to struct page's
- */
-static int precopy_buffers(int buffer_index,
-			   struct iov_iter *iter,
-			   size_t total_size)
-{
-	int ret = 0;
-	/*
-	 * copy data from application/kernel by pulling it out
-	 * of the iovec.
-	 */
-
-
-	if (total_size) {
-		ret = orangefs_bufmap_copy_from_iovec(iter,
-						      buffer_index,
-						      total_size);
-		if (ret < 0)
-		gossip_err("%s: Failed to copy-in buffers. Please make sure that the pvfs2-client is running. %ld\n",
-			   __func__,
-			   (long)ret);
-	}
-
-	if (ret < 0)
-		gossip_err("%s: Failed to copy-in buffers. Please make sure that the pvfs2-client is running. %ld\n",
-			__func__,
-			(long)ret);
-	return ret;
-}
-
-/*
- * Copy from client-core's address space to the buffers specified
- * by the iovec upto total_size bytes.
- * NOTE: the iovector can either contain addresses which
- *       can futher be kernel-space or user-space addresses.
- *       or it can pointers to struct page's
- */
-static int postcopy_buffers(int buffer_index,
-			    struct iov_iter *iter,
-			    size_t total_size)
-{
-	int ret = 0;
-	/*
-	 * copy data to application/kernel by pushing it out to
-	 * the iovec. NOTE; target buffers can be addresses or
-	 * struct page pointers.
-	 */
-	if (total_size) {
-		ret = orangefs_bufmap_copy_to_iovec(iter,
-						    buffer_index,
-						    total_size);
-		if (ret < 0)
-			gossip_err("%s: Failed to copy-out buffers. Please make sure that the pvfs2-client is running (%ld)\n",
-				__func__,
-				(long)ret);
-	}
-	return ret;
-}
-
-/*
  * Post and wait for the I/O upcall to finish
  */
 static ssize_t wait_for_direct_io(enum ORANGEFS_io_type type, struct inode *inode,
@@ -157,14 +93,15 @@ populate_shared_memory:
 		     total_size);
 	/*
 	 * Stage 1: copy the buffers into client-core's address space
-	 * precopy_buffers only pertains to writes.
 	 */
-	if (type == ORANGEFS_IO_WRITE) {
-		ret = precopy_buffers(buffer_index,
-				      iter,
-				      total_size);
-		if (ret < 0)
+	if (type == ORANGEFS_IO_WRITE && total_size) {
+		ret = orangefs_bufmap_copy_from_iovec(iter, buffer_index,
+		    total_size);
+		if (ret < 0) {
+			gossip_err("%s: Failed to copy-in buffers. Please make sure that the pvfs2-client is running. %ld\n",
+			    __func__, (long)ret);
 			goto out;
+		}
 	}
 
 	gossip_debug(GOSSIP_FILE_DEBUG,
@@ -260,14 +197,20 @@ populate_shared_memory:
 
 	/*
 	 * Stage 3: Post copy buffers from client-core's address space
-	 * postcopy_buffers only pertains to reads.
 	 */
-	if (type == ORANGEFS_IO_READ) {
-		ret = postcopy_buffers(buffer_index,
-				       iter,
-				       new_op->downcall.resp.io.amt_complete);
-		if (ret < 0)
+	if (type == ORANGEFS_IO_READ && new_op->downcall.resp.io.amt_complete) {
+		/*
+		 * NOTE: the iovector can either contain addresses which
+		 *       can futher be kernel-space or user-space addresses.
+		 *       or it can pointers to struct page's
+		 */
+		ret = orangefs_bufmap_copy_to_iovec(iter, buffer_index,
+		    new_op->downcall.resp.io.amt_complete);
+		if (ret < 0) {
+			gossip_err("%s: Failed to copy-out buffers. Please make sure that the pvfs2-client is running (%ld)\n",
+			    __func__, (long)ret);
 			goto out;
+		}
 	}
 	gossip_debug(GOSSIP_FILE_DEBUG,
 	    "%s(%pU): Amount %s, returned by the sys-io call:%d\n",
@@ -585,6 +528,28 @@ static long orangefs_ioctl(struct file *file, unsigned int cmd, unsigned long ar
 	return ret;
 }
 
+static int orangefs_fault(struct vm_fault *vmf)
+{
+	struct file *file = vmf->vma->vm_file;
+	int rc;
+	rc = orangefs_inode_getattr(file->f_mapping->host, 0, 1,
+	    STATX_SIZE);
+	if (rc == -ESTALE)
+		rc = -EIO;
+	if (rc) {
+		gossip_err("%s: orangefs_inode_getattr failed, "
+		    "rc:%d:.\n", __func__, rc);
+		return rc;
+	}
+	return filemap_fault(vmf);
+}
+
+const struct vm_operations_struct orangefs_file_vm_ops = {
+	.fault = orangefs_fault,
+	.map_pages = filemap_map_pages,
+	.page_mkwrite = filemap_page_mkwrite,
+};
+
 /*
  * Memory map a region of a file.
  */
@@ -596,12 +561,16 @@ static int orangefs_file_mmap(struct file *file, struct vm_area_struct *vma)
 			(char *)file->f_path.dentry->d_name.name :
 			(char *)"Unknown"));
 
+	if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE))
+		return -EINVAL;
+
 	/* set the sequential readahead hint */
 	vma->vm_flags |= VM_SEQ_READ;
 	vma->vm_flags &= ~VM_RAND_READ;
 
-	/* Use readonly mmap since we cannot support writable maps. */
-	return generic_file_readonly_mmap(file, vma);
+	file_accessed(file);
+	vma->vm_ops = &orangefs_file_vm_ops;
+	return 0;
 }
 
 #define mapping_nrpages(idata) ((idata)->nrpages)