xfs: add scrub cross-referencing helpers for the inode btrees

Add a couple of functions to the inode btrees that will be used
to cross-reference metadata against the inobt.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index c01ed9c..3625d1d 100644 (file)
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -2753,3 +2753,102 @@ xfs_verify_dir_ino(
                return false;
        return xfs_verify_ino(mp, ino);
 }
+
+/* Is there an inode record covering a given range of inode numbers? */
+int
+xfs_ialloc_has_inode_record(
+       struct xfs_btree_cur    *cur,
+       xfs_agino_t             low,
+       xfs_agino_t             high,
+       bool                    *exists)
+{
+       struct xfs_inobt_rec_incore     irec;
+       xfs_agino_t             agino;
+       uint16_t                holemask;
+       int                     has_record;
+       int                     i;
+       int                     error;
+
+       *exists = false;
+       error = xfs_inobt_lookup(cur, low, XFS_LOOKUP_LE, &has_record);
+       while (error == 0 && has_record) {
+               error = xfs_inobt_get_rec(cur, &irec, &has_record);
+               if (error || irec.ir_startino > high)
+                       break;
+
+               agino = irec.ir_startino;
+               holemask = irec.ir_holemask;
+               for (i = 0; i < XFS_INOBT_HOLEMASK_BITS; holemask >>= 1,
+                               i++, agino += XFS_INODES_PER_HOLEMASK_BIT) {
+                       if (holemask & 1)
+                               continue;
+                       if (agino + XFS_INODES_PER_HOLEMASK_BIT > low &&
+                                       agino <= high) {
+                               *exists = true;
+                               return 0;
+                       }
+               }
+
+               error = xfs_btree_increment(cur, 0, &has_record);
+       }
+       return error;
+}
+
+/* Is there an inode record covering a given extent? */
+int
+xfs_ialloc_has_inodes_at_extent(
+       struct xfs_btree_cur    *cur,
+       xfs_agblock_t           bno,
+       xfs_extlen_t            len,
+       bool                    *exists)
+{
+       xfs_agino_t             low;
+       xfs_agino_t             high;
+
+       low = XFS_OFFBNO_TO_AGINO(cur->bc_mp, bno, 0);
+       high = XFS_OFFBNO_TO_AGINO(cur->bc_mp, bno + len, 0) - 1;
+
+       return xfs_ialloc_has_inode_record(cur, low, high, exists);
+}
+
+struct xfs_ialloc_count_inodes {
+       xfs_agino_t                     count;
+       xfs_agino_t                     freecount;
+};
+
+/* Record inode counts across all inobt records. */
+STATIC int
+xfs_ialloc_count_inodes_rec(
+       struct xfs_btree_cur            *cur,
+       union xfs_btree_rec             *rec,
+       void                            *priv)
+{
+       struct xfs_inobt_rec_incore     irec;
+       struct xfs_ialloc_count_inodes  *ci = priv;
+
+       xfs_inobt_btrec_to_irec(cur->bc_mp, rec, &irec);
+       ci->count += irec.ir_count;
+       ci->freecount += irec.ir_freecount;
+
+       return 0;
+}
+
+/* Count allocated and free inodes under an inobt. */
+int
+xfs_ialloc_count_inodes(
+       struct xfs_btree_cur            *cur,
+       xfs_agino_t                     *count,
+       xfs_agino_t                     *freecount)
+{
+       struct xfs_ialloc_count_inodes  ci = {0};
+       int                             error;
+
+       ASSERT(cur->bc_btnum == XFS_BTNUM_INO);
+       error = xfs_btree_query_all(cur, xfs_ialloc_count_inodes_rec, &ci);
+       if (error)
+               return error;
+
+       *count = ci.count;
+       *freecount = ci.freecount;
+       return 0;
+}

diff --git a/fs/xfs/libxfs/xfs_ialloc.h b/fs/xfs/libxfs/xfs_ialloc.h
index 66a8de0..c5402bb 100644 (file)
--- a/fs/xfs/libxfs/xfs_ialloc.h
+++ b/fs/xfs/libxfs/xfs_ialloc.h
@@ -170,6 +170,12 @@ int xfs_read_agi(struct xfs_mount *mp, struct xfs_trans *tp,
 union xfs_btree_rec;
 void xfs_inobt_btrec_to_irec(struct xfs_mount *mp, union xfs_btree_rec *rec,
                struct xfs_inobt_rec_incore *irec);
+int xfs_ialloc_has_inodes_at_extent(struct xfs_btree_cur *cur,
+               xfs_agblock_t bno, xfs_extlen_t len, bool *exists);
+int xfs_ialloc_has_inode_record(struct xfs_btree_cur *cur, xfs_agino_t low,
+               xfs_agino_t high, bool *exists);
+int xfs_ialloc_count_inodes(struct xfs_btree_cur *cur, xfs_agino_t *count,
+               xfs_agino_t *freecount);
 
 int xfs_ialloc_cluster_alignment(struct xfs_mount *mp);
 void xfs_ialloc_agino_range(struct xfs_mount *mp, xfs_agnumber_t agno,