ext4: zero out inline data using memset() instead of empty_zero_page

Not all architectures (in particular, sparc64) have empty_zero_page.
So instead of copying from empty_zero_page, use memset to clear the
inline data by signalling to ext4_xattr_set_entry() via a magic
pointer value, EXT4_ZERO_ATTR_VALUE, which is defined by casting -1 to
a pointer.

This fixes a build failure on sparc64, and the memset() should be more
efficient than using memcpy() anyway.

Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 16 insertions, 6 deletions

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 2251769a3c53..3a91ebc2b66f 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -628,9 +628,14 @@ ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
                                    size. Just replace. */
                                 s->here->e_value_size =
                                         cpu_to_le32(i->value_len);
-                                memset(val + size - EXT4_XATTR_PAD, 0,
-                                       EXT4_XATTR_PAD); /* Clear pad bytes. */
-                                memcpy(val, i->value, i->value_len);
+                                if (i->value == EXT4_ZERO_XATTR_VALUE) {
+                                        memset(val, 0, size);
+                                } else {
+                                        /* Clear pad bytes first. */
+                                        memset(val + size - EXT4_XATTR_PAD, 0,
+                                               EXT4_XATTR_PAD);
+                                        memcpy(val, i->value, i->value_len);
+                                }
                                 return 0;
                         }
 
@@ -669,9 +674,14 @@ ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s)
                         size_t size = EXT4_XATTR_SIZE(i->value_len);
                         void *val = s->base + min_offs - size;
                         s->here->e_value_offs = cpu_to_le16(min_offs - size);
-                        memset(val + size - EXT4_XATTR_PAD, 0,
-                               EXT4_XATTR_PAD); /* Clear the pad bytes. */
-                        memcpy(val, i->value, i->value_len);
+                        if (i->value == EXT4_ZERO_XATTR_VALUE) {
+                                memset(val, 0, size);
+                        } else {
+                                /* Clear the pad bytes first. */
+                                memset(val + size - EXT4_XATTR_PAD, 0,
+                                       EXT4_XATTR_PAD);
+                                memcpy(val, i->value, i->value_len);
+                        }
                 }
         }
         return 0;