f2fs: fix the use of XATTR_NODE_OFFSET

This patch fixes the use of XATTR_NODE_OFFSET.

o The offset should not use several MSB bits which are used by marking node
blocks.

o IS_DNODE should handle XATTR_NODE_OFFSET to avoid potential abnormality
during the fsync call.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d8e386ceb0cd..eb8c45b65fe5 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -135,11 +135,13 @@ static inline int update_sits_in_cursum(struct f2fs_summary_block *rs, int i)
 /*
  * For INODE and NODE manager
  */
-#define XATTR_NODE_OFFSET       (-1)    /*
-                                         * store xattrs to one node block per
-                                         * file keeping -1 as its node offset to
-                                         * distinguish from index node blocks.
-                                         */
+/*
+ * XATTR_NODE_OFFSET stores xattrs to one node block per file keeping -1
+ * as its node offset to distinguish from index node blocks.
+ * But some bits are used to mark the node block.
+ */
+#define XATTR_NODE_OFFSET       ((((unsigned int)-1) << OFFSET_BIT_SHIFT) \
+                                >> OFFSET_BIT_SHIFT)
 enum {
         ALLOC_NODE,                     /* allocate a new node page if needed */
         LOOKUP_NODE,                    /* look up a node without readahead */