[PATCH 08/16] xfs: add rmap btree growfs support

[Dave Chinner <david@xxxxxxxxxxxxx>]

From: Dave Chinner <dchinner@xxxxxxxxxx>

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@xxxxxxxxxx: fill out the rmap offset fields]

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
---
 fs/xfs/xfs_fsops.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index b4ab22c..042f215 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -32,6 +32,7 @@
 #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"
@@ -243,6 +244,12 @@ 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 = 0;
                agf->agf_fllast = cpu_to_be32(XFS_AGFL_SIZE(mp) - 1);
                agf->agf_flcount = 0;
@@ -382,6 +389,72 @@ 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
                 */
-- 
2.7.0