[PATCH 11/20] xfs: add rmap btree growfs support

Dave Chinner
2015-06-03T06:05:09Z

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

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
fs/xfs/xfs_fsops.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index ebfeb84..b8b2f06 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 +389,67 @@ 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, 2,
+ 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);
+ 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);
+ 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);
+ 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);
+ be16_add_cpu(&block->bb_numrecs, 1);
+
+ error = xfs_bwrite(bp);
+ xfs_buf_relse(bp);
+ if (error)
+ goto error0;
+ }
+
/*
* INO btree root block
*/