udf: avoid redundant memcpy when writing data in ICB
Valid data within i_size in page cache will be copied to ICB cache when we
writeback the page by invoking udf_adinicb_writepage, so the copy in
udf_adinicb_write_end is redundant.
After we remove the copy, it's better to use simple_write_end directly in
udf_adinicb_aops instead of udf_adinicb_write_end.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/file.c b/fs/udf/file.c
index 72b8dae..86c6743 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -100,24 +100,6 @@
return 0;
}
-static int udf_adinicb_write_end(struct file *file,
- struct address_space *mapping,
- loff_t pos, unsigned len, unsigned copied,
- struct page *page, void *fsdata)
-{
- struct inode *inode = mapping->host;
- unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
- char *kaddr;
- struct udf_inode_info *iinfo = UDF_I(inode);
-
- kaddr = kmap_atomic(page);
- memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr + offset,
- kaddr + offset, copied);
- kunmap_atomic(kaddr);
-
- return simple_write_end(file, mapping, pos, len, copied, page, fsdata);
-}
-
static ssize_t udf_adinicb_direct_IO(int rw, struct kiocb *iocb,
struct iov_iter *iter,
loff_t offset)
@@ -130,7 +112,7 @@
.readpage = udf_adinicb_readpage,
.writepage = udf_adinicb_writepage,
.write_begin = udf_adinicb_write_begin,
- .write_end = udf_adinicb_write_end,
+ .write_end = simple_write_end,
.direct_IO = udf_adinicb_direct_IO,
};