udf: use kmap_atomic for memcpy copying

Use temporary mapping for memory copying operations.

To avoid any sleeping problem,

mark_inode_dirty(inode) was moved after kunmap() in
udf_adinicb_readpage()

down_write(&iinfo->i_data_sem) set before kmap_atomic()
in udf_expand_file_adinicb()

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 5 deletions

diff --git a/fs/udf/file.c b/fs/udf/file.c
index e04cc0cdca9d..f5eb2d5b3bac 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -44,12 +44,12 @@ static void __udf_adinicb_readpage(struct page *page)
         char *kaddr;
         struct udf_inode_info *iinfo = UDF_I(inode);
 
-        kaddr = kmap(page);
+        kaddr = kmap_atomic(page);
         memcpy(kaddr, iinfo->i_ext.i_data + iinfo->i_lenEAttr, inode->i_size);
         memset(kaddr + inode->i_size, 0, PAGE_SIZE - inode->i_size);
         flush_dcache_page(page);
         SetPageUptodate(page);
-        kunmap(page);
+        kunmap_atomic(kaddr);
 }
 
 static int udf_adinicb_readpage(struct file *file, struct page *page)
@@ -70,11 +70,11 @@ static int udf_adinicb_writepage(struct page *page,
 
         BUG_ON(!PageLocked(page));
 
-        kaddr = kmap(page);
+        kaddr = kmap_atomic(page);
         memcpy(iinfo->i_ext.i_data + iinfo->i_lenEAttr, kaddr, inode->i_size);
-        mark_inode_dirty(inode);
         SetPageUptodate(page);
-        kunmap(page);
+        kunmap_atomic(kaddr);
+        mark_inode_dirty(inode);
         unlock_page(page);
 
         return 0;