From: Darrick J. Wong <djwong@xxxxxxxxxx>
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@xxxxxxxxxx>
---
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 --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;
