xfs: introduce rmap btree definitions

[cascardo/linux.git] / fs / xfs / libxfs / xfs_format.h

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index adb204d..74f4d3d 100644 (file)
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -455,6 +455,7 @@ xfs_sb_has_compat_feature(
 }
 
 #define XFS_SB_FEAT_RO_COMPAT_FINOBT   (1 << 0)                /* free inode btree */
+#define XFS_SB_FEAT_RO_COMPAT_RMAPBT   (1 << 1)                /* reverse map btree */
 #define XFS_SB_FEAT_RO_COMPAT_ALL \
                (XFS_SB_FEAT_RO_COMPAT_FINOBT)
 #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN  ~XFS_SB_FEAT_RO_COMPAT_ALL
@@ -538,6 +539,12 @@ static inline bool xfs_sb_version_hasmetauuid(struct xfs_sb *sbp)
                (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_META_UUID);
 }
 
+static inline bool xfs_sb_version_hasrmapbt(struct xfs_sb *sbp)
+{
+       return (XFS_SB_VERSION_NUM(sbp) == XFS_SB_VERSION_5) &&
+               (sbp->sb_features_ro_compat & XFS_SB_FEAT_RO_COMPAT_RMAPBT);
+}
+
 /*
  * end of superblock version macros
  */
@@ -598,10 +605,10 @@ xfs_is_quota_inode(struct xfs_sb *sbp, xfs_ino_t ino)
 #define        XFS_AGI_GOOD_VERSION(v) ((v) == XFS_AGI_VERSION)
 
 /*
- * Btree number 0 is bno, 1 is cnt.  This value gives the size of the
+ * Btree number 0 is bno, 1 is cnt, 2 is rmap. This value gives the size of the
  * arrays below.
  */
-#define        XFS_BTNUM_AGF   ((int)XFS_BTNUM_CNTi + 1)
+#define        XFS_BTNUM_AGF   ((int)XFS_BTNUM_RMAPi + 1)
 
 /*
  * The second word of agf_levels in the first a.g. overlaps the EFS
@@ -618,12 +625,10 @@ typedef struct xfs_agf {
        __be32          agf_seqno;      /* sequence # starting from 0 */
        __be32          agf_length;     /* size in blocks of a.g. */
        /*
-        * Freespace information
+        * Freespace and rmap information
         */
        __be32          agf_roots[XFS_BTNUM_AGF];       /* root blocks */
-       __be32          agf_spare0;     /* spare field */
        __be32          agf_levels[XFS_BTNUM_AGF];      /* btree levels */
-       __be32          agf_spare1;     /* spare field */
 
        __be32          agf_flfirst;    /* first freelist block's index */
        __be32          agf_fllast;     /* last freelist block's index */
@@ -1307,6 +1312,13 @@ typedef __be32 xfs_inobt_ptr_t;
 #define        XFS_IBT_BLOCK(mp)               ((xfs_agblock_t)(XFS_CNT_BLOCK(mp) + 1))
 #define        XFS_FIBT_BLOCK(mp)              ((xfs_agblock_t)(XFS_IBT_BLOCK(mp) + 1))
 
+/*
+ * Reverse mapping btree format definitions
+ *
+ * There is a btree for the reverse map per allocation group
+ */
+#define        XFS_RMAP_CRC_MAGIC      0x524d4233      /* 'RMB3' */
+
 /*
  * The first data block of an AG depends on whether the filesystem was formatted
  * with the finobt feature. If so, account for the finobt reserved root btree