xfs: add rmap btree growfs support

Originally-From: Dave Chinner <dchinner@redhat.com>

Now we can read and write rmap btree blocks, we can add support to
the growfs code to initialise new rmap btree blocks.

[darrick.wong@oracle.com: fill out the rmap offset fields]

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

1 files changed, 73 insertions, 0 deletions

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index b625b61d1244..27e6e8cdd431 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -33,6 +33,7 @@
 #include "xfs_btree.h"
 #include "xfs_alloc_btree.h"
 #include "xfs_alloc.h"
+#include "xfs_rmap_btree.h"
 #include "xfs_ialloc.h"
 #include "xfs_fsops.h"
 #include "xfs_itable.h"
@@ -241,6 +242,12 @@ xfs_growfs_data_private(
                 agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
                 agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
                 agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
+                if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
+                        agf->agf_roots[XFS_BTNUM_RMAPi] =
+                                                cpu_to_be32(XFS_RMAP_BLOCK(mp));
+                        agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
+                }
+
                 agf->agf_flfirst = cpu_to_be32(1);
                 agf->agf_fllast = 0;
                 agf->agf_flcount = 0;
@@ -380,6 +387,72 @@ xfs_growfs_data_private(
                 if (error)
                         goto error0;
 
+                /* RMAP btree root block */
+                if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
+                        struct xfs_rmap_rec     *rrec;
+                        struct xfs_btree_block  *block;
+
+                        bp = xfs_growfs_get_hdr_buf(mp,
+                                XFS_AGB_TO_DADDR(mp, agno, XFS_RMAP_BLOCK(mp)),
+                                BTOBB(mp->m_sb.sb_blocksize), 0,
+                                &xfs_rmapbt_buf_ops);
+                        if (!bp) {
+                                error = -ENOMEM;
+                                goto error0;
+                        }
+
+                        xfs_btree_init_block(mp, bp, XFS_RMAP_CRC_MAGIC, 0, 0,
+                                                agno, XFS_BTREE_CRC_BLOCKS);
+                        block = XFS_BUF_TO_BLOCK(bp);
+
+
+                        /*
+                         * mark the AG header regions as static metadata The BNO
+                         * btree block is the first block after the headers, so
+                         * it's location defines the size of region the static
+                         * metadata consumes.
+                         *
+                         * Note: unlike mkfs, we never have to account for log
+                         * space when growing the data regions
+                         */
+                        rrec = XFS_RMAP_REC_ADDR(block, 1);
+                        rrec->rm_startblock = 0;
+                        rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
+                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
+                        rrec->rm_offset = 0;
+                        be16_add_cpu(&block->bb_numrecs, 1);
+
+                        /* account freespace btree root blocks */
+                        rrec = XFS_RMAP_REC_ADDR(block, 2);
+                        rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
+                        rrec->rm_blockcount = cpu_to_be32(2);
+                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
+                        rrec->rm_offset = 0;
+                        be16_add_cpu(&block->bb_numrecs, 1);
+
+                        /* account inode btree root blocks */
+                        rrec = XFS_RMAP_REC_ADDR(block, 3);
+                        rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
+                        rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
+                                                        XFS_IBT_BLOCK(mp));
+                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
+                        rrec->rm_offset = 0;
+                        be16_add_cpu(&block->bb_numrecs, 1);
+
+                        /* account for rmap btree root */
+                        rrec = XFS_RMAP_REC_ADDR(block, 4);
+                        rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
+                        rrec->rm_blockcount = cpu_to_be32(1);
+                        rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
+                        rrec->rm_offset = 0;
+                        be16_add_cpu(&block->bb_numrecs, 1);
+
+                        error = xfs_bwrite(bp);
+                        xfs_buf_relse(bp);
+                        if (error)
+                                goto error0;
+                }
+
                 /*
                  * INO btree root block
                  */