xfs: factor the ag length extension code into libxfs
Growfs currently manually codes the extension of the last AG in a
filesytem during the growfs process. Factor that out of the growfs
code and move it into libxfs along with teh rest of the AG header
modification code.
Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
index 5baa22c0..9345802 100644
--- a/fs/xfs/libxfs/xfs_ag.c
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -16,6 +16,7 @@
#include "xfs_alloc_btree.h"
#include "xfs_rmap_btree.h"
#include "xfs_alloc.h"
+#include "xfs_ialloc.h"
#include "xfs_rmap.h"
#include "xfs_ag.h"
@@ -402,3 +403,62 @@ xfs_ag_init_headers(
}
return error;
}
+
+/*
+ * Extent the AG indicated by the @id by the length passed in
+ */
+int
+xfs_ag_extend_space(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct aghdr_init_data *id,
+ xfs_extlen_t len)
+{
+ struct xfs_owner_info oinfo;
+ struct xfs_buf *bp;
+ struct xfs_agi *agi;
+ struct xfs_agf *agf;
+ int error;
+
+ /*
+ * Change the agi length.
+ */
+ error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp);
+ if (error)
+ return error;
+
+ agi = XFS_BUF_TO_AGI(bp);
+ be32_add_cpu(&agi->agi_length, len);
+ ASSERT(id->agno == mp->m_sb.sb_agcount - 1 ||
+ be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
+ xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
+
+ /*
+ * Change agf length.
+ */
+ error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp);
+ if (error)
+ return error;
+
+ agf = XFS_BUF_TO_AGF(bp);
+ be32_add_cpu(&agf->agf_length, len);
+ ASSERT(agf->agf_length == agi->agi_length);
+ xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
+
+ /*
+ * Free the new space.
+ *
+ * XFS_RMAP_OWN_NULL is used here to tell the rmap btree that
+ * this doesn't actually exist in the rmap btree.
+ */
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_NULL);
+ error = xfs_rmap_free(tp, bp, id->agno,
+ be32_to_cpu(agf->agf_length) - len,
+ len, &oinfo);
+ if (error)
+ return error;
+
+ return xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno,
+ be32_to_cpu(agf->agf_length) - len),
+ len, &oinfo, XFS_AG_RESV_NONE);
+}