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>
diff --git a/fs/udf/file.c b/fs/udf/file.c
index e04cc0c..f5eb2d5 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;
