[PATCH 38/58] xfs: add refcount btree support to growfs

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

Modify the growfs code to initialize new refcount btree blocks.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/xfs_fsops.c |   38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)


diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 64bb02b..7c37c22 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -260,6 +260,11 @@ xfs_growfs_data_private(
                agf->agf_longest = cpu_to_be32(tmpsize);
                if (xfs_sb_version_hascrc(&mp->m_sb))
                        uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
+               if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+                       agf->agf_refcount_root = cpu_to_be32(
+                                       xfs_refc_block(mp));
+                       agf->agf_refcount_level = cpu_to_be32(1);
+               }
 
                error = xfs_bwrite(bp);
                xfs_buf_relse(bp);
@@ -451,6 +456,17 @@ xfs_growfs_data_private(
                        rrec->rm_offset = 0;
                        be16_add_cpu(&block->bb_numrecs, 1);
 
+                       /* account for refc btree root */
+                       if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+                               rrec = XFS_RMAP_REC_ADDR(block, 5);
+                               rrec->rm_startblock = cpu_to_be32(
+                                               xfs_refc_block(mp));
+                               rrec->rm_blockcount = cpu_to_be32(1);
+                               rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
+                               rrec->rm_offset = 0;
+                               be16_add_cpu(&block->bb_numrecs, 1);
+                       }
+
                        error = xfs_bwrite(bp);
                        xfs_buf_relse(bp);
                        if (error)
@@ -508,6 +524,28 @@ xfs_growfs_data_private(
                                goto error0;
                }
 
+               /*
+                * refcount btree root block
+                */
+               if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+                       bp = xfs_growfs_get_hdr_buf(mp,
+                               XFS_AGB_TO_DADDR(mp, agno, xfs_refc_block(mp)),
+                               BTOBB(mp->m_sb.sb_blocksize), 0,
+                               &xfs_refcountbt_buf_ops);
+                       if (!bp) {
+                               error = -ENOMEM;
+                               goto error0;
+                       }
+
+                       xfs_btree_init_block(mp, bp, XFS_REFC_CRC_MAGIC,
+                                            0, 0, agno,
+                                            XFS_BTREE_CRC_BLOCKS);
+
+                       error = xfs_bwrite(bp);
+                       xfs_buf_relse(bp);
+                       if (error)
+                               goto error0;
+               }
        }
        xfs_trans_agblocks_delta(tp, nfree);
        /*