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-rw-r--r--include/linux/reiserfs_fs.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index 69a3e12cb8c8..d8653bf232e3 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -283,6 +283,18 @@ static inline struct reiserfs_sb_info *REISERFS_SB(const struct super_block *sb)
return sb->s_fs_info;
}
+/* Don't trust REISERFS_SB(sb)->s_bmap_nr, it's a u16
+ * which overflows on large file systems. */
+static inline u32 reiserfs_bmap_count(struct super_block *sb)
+{
+ return (SB_BLOCK_COUNT(sb) - 1) / (sb->s_blocksize * 8) + 1;
+}
+
+static inline int bmap_would_wrap(unsigned bmap_nr)
+{
+ return bmap_nr > ((1LL << 16) - 1);
+}
+
/** this says about version of key of all items (but stat data) the
object consists of */
#define get_inode_item_key_version( inode ) \