Signed-off-by: Peng Tao <tao.p...@primarydata.com>
---
fs/nfs/nfs4file.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index dcd39d4..c335cb0 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -4,6 +4,7 @@
* Copyright (C) 1992 Rick Sladkey
*/
#include <linux/fs.h>
+#include <linux/file.h>
#include <linux/falloc.h>
#include <linux/nfs_fs.h>
#include "internal.h"
@@ -166,6 +167,54 @@ static long nfs42_fallocate(struct file *filep, int mode,
loff_t offset, loff_t
return nfs42_proc_deallocate(filep, offset, len);
return nfs42_proc_allocate(filep, offset, len);
}
+
+static noinline int
+nfs42_file_clone_range(struct file *src_file, struct file *dst_file,
+ loff_t src_off, size_t dst_off, loff_t count)
+{
+ struct inode *dst_inode = file_inode(dst_file);
+ struct inode *src_inode = file_inode(src_file);
+ int ret;
+
+ /* src and dst must be different files */
+ if (src_inode == dst_inode)
+ return -EINVAL;
+
+ /* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
+ if (dst_inode < src_inode) {
+ mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_PARENT);
+ mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_CHILD);
+ } else {
+ mutex_lock_nested(&src_inode->i_mutex, I_MUTEX_PARENT);
+ mutex_lock_nested(&dst_inode->i_mutex, I_MUTEX_CHILD);
+ }
+
+ /* flush all pending writes on both src and dst so that server
+ * has the latest data */
+ ret = nfs_sync_inode(src_inode);
+ if (ret)
+ goto out_unlock;
+ ret = nfs_sync_inode(dst_inode);
+ if (ret)
+ goto out_unlock;
+
+ ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
+
+ /* truncate inode page cache of the dst range so that future reads can
fetch
+ * new data from server */
+ if (!ret)
+ truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off
+ count - 1);
+
+out_unlock:
+ if (dst_inode < src_inode) {
+ mutex_unlock(&src_inode->i_mutex);
+ mutex_unlock(&dst_inode->i_mutex);
+ } else {
+ mutex_unlock(&dst_inode->i_mutex);
+ mutex_unlock(&src_inode->i_mutex);
+ }
+ return ret;
+}
#endif /* CONFIG_NFS_V4_2 */
const struct file_operations nfs4_file_operations = {
@@ -187,6 +236,7 @@ const struct file_operations nfs4_file_operations = {
.splice_write = iter_file_splice_write,
#ifdef CONFIG_NFS_V4_2
.fallocate = nfs42_fallocate,
+ .clone_range = nfs42_file_clone_range,
#endif /* CONFIG_NFS_V4_2 */
.check_flags = nfs_check_flags,
.setlease = simple_nosetlease,
--
1.8.3.1
--
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