fs: ext4: change GFP_KERNEL to GFP_NOFS to avoid deadlock

[ Upstream commit 1534f72 ]

The parent function ext4_xattr_inode_lookup_create already uses GFP_NOFS for memory alloction, so the function ext4_xattr_inode_cache_find should use same gfp_flag.

Signed-off-by: chuguangqing <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: chuguangqing

fs/ext4/xattr.c

@@ -1552,7 +1552,7 @@ ext4_xattr_inode_cache_find(struct inode *inode, const void *value,
 	WARN_ON_ONCE(ext4_handle_valid(journal_current_handle()) &&
 		     !(current->flags & PF_MEMALLOC_NOFS));
 
-	ea_data = kvmalloc(value_len, GFP_KERNEL);
+	ea_data = kvmalloc(value_len, GFP_NOFS);
 	if (!ea_data) {
 		mb_cache_entry_put(ea_inode_cache, ce);
 		return NULL;