diff mbox series

[12/42] xfs: add metadata reservations for realtime refcount btree

Message ID 167243871068.717073.4070369282152095464.stgit@magnolia (mailing list archive)
State Superseded, archived
Headers show
Series xfs: reflink on the realtime device | expand

Commit Message

Darrick J. Wong Dec. 30, 2022, 10:18 p.m. UTC 
From: Darrick J. Wong <djwong@kernel.org>

Reserve some free blocks so that we will always have enough free blocks
in the data volume to handle expansion of the realtime refcount btree.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/libxfs/xfs_rtrefcount_btree.c |   39 ++++++++++++++++++++++++++++++++++
 fs/xfs/libxfs/xfs_rtrefcount_btree.h |    2 ++
 fs/xfs/xfs_rtalloc.c                 |    9 +++++++-
 3 files changed, 49 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/fs/xfs/libxfs/xfs_rtrefcount_btree.c b/fs/xfs/libxfs/xfs_rtrefcount_btree.c
index 40524fee3860..74c5cf9a0d3a 100644
--- a/fs/xfs/libxfs/xfs_rtrefcount_btree.c
+++ b/fs/xfs/libxfs/xfs_rtrefcount_btree.c
@@ -490,3 +490,42 @@  xfs_rtrefcountbt_create_path(
 	*pathp = path;
 	return 0;
 }
+
+/* Calculate the rtrefcount btree size for some records. */
+static unsigned long long
+xfs_rtrefcountbt_calc_size(
+	struct xfs_mount	*mp,
+	unsigned long long	len)
+{
+	return xfs_btree_calc_size(mp->m_rtrefc_mnr, len);
+}
+
+/*
+ * Calculate the maximum refcount btree size.
+ */
+static unsigned long long
+xfs_rtrefcountbt_max_size(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtblocks)
+{
+	/* Bail out if we're uninitialized, which can happen in mkfs. */
+	if (mp->m_rtrefc_mxr[0] == 0)
+		return 0;
+
+	return xfs_rtrefcountbt_calc_size(mp, rtblocks);
+}
+
+/*
+ * Figure out how many blocks to reserve and how many are used by this btree.
+ * We need enough space to hold one record for every rt extent in the rtgroup.
+ */
+xfs_filblks_t
+xfs_rtrefcountbt_calc_reserves(
+	struct xfs_mount	*mp)
+{
+	if (!xfs_has_rtreflink(mp))
+		return 0;
+
+	return xfs_rtrefcountbt_max_size(mp,
+			xfs_rtb_to_rtxt(mp, mp->m_sb.sb_rgblocks));
+}
diff --git a/fs/xfs/libxfs/xfs_rtrefcount_btree.h b/fs/xfs/libxfs/xfs_rtrefcount_btree.h
index 1f3f590c68e6..ffda0b063bcf 100644
--- a/fs/xfs/libxfs/xfs_rtrefcount_btree.h
+++ b/fs/xfs/libxfs/xfs_rtrefcount_btree.h
@@ -72,4 +72,6 @@  void xfs_rtrefcountbt_destroy_cur_cache(void);
 int xfs_rtrefcountbt_create_path(struct xfs_mount *mp, xfs_rgnumber_t rgno,
 		struct xfs_imeta_path **pathp);
 
+xfs_filblks_t xfs_rtrefcountbt_calc_reserves(struct xfs_mount *mp);
+
 #endif	/* __XFS_RTREFCOUNT_BTREE_H__ */
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index c998e26f5db9..48c7cc28b7f2 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1733,8 +1733,10 @@  xfs_rt_resv_free(
 	struct xfs_rtgroup	*rtg;
 	xfs_rgnumber_t		rgno;
 
-	for_each_rtgroup(mp, rgno, rtg)
+	for_each_rtgroup(mp, rgno, rtg) {
+		xfs_imeta_resv_free_inode(rtg->rtg_refcountip);
 		xfs_imeta_resv_free_inode(rtg->rtg_rmapip);
+	}
 }
 
 /* Reserve space for rt metadata inodes' space expansion. */
@@ -1754,6 +1756,11 @@  xfs_rt_resv_init(
 		err2 = xfs_imeta_resv_init_inode(rtg->rtg_rmapip, ask);
 		if (err2 && !error)
 			error = err2;
+
+		ask = xfs_rtrefcountbt_calc_reserves(mp);
+		err2 = xfs_imeta_resv_init_inode(rtg->rtg_refcountip, ask);
+		if (err2 && !error)
+			error = err2;
 	}
 
 	return error;