xfs: add metadata reservations for realtime refcount btree
authorDarrick J. Wong <djwong@kernel.org>
Thu, 15 Aug 2024 18:49:23 +0000 (11:49 -0700)
committerChristoph Hellwig <hch@lst.de>
Sun, 22 Sep 2024 08:48:24 +0000 (10:48 +0200)
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
fs/xfs/libxfs/xfs_rtrefcount_btree.h
fs/xfs/xfs_rtalloc.c

index 86f6d05b52c65345ea8a75320e558ef2e8c7d6fc..b76feb4260dac5e63ebf1a269d79ab021df9b3ec 100644 (file)
@@ -425,3 +425,41 @@ xfs_rtrefcountbt_compute_maxlevels(
        /* Add one level to handle the inode root level. */
        mp->m_rtrefc_maxlevels = min(d_maxlevels, r_maxlevels) + 1;
 }
+
+/* Calculate the rtrefcount btree size for some records. */
+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, mp->m_sb.sb_rgextents);
+}
index 6d23ab3a9ad4156de84d5f2cf622f1ce61bae181..d1662f870f1c573f76fbf303e40bef6d7f1728ae 100644 (file)
@@ -68,4 +68,8 @@ unsigned int xfs_rtrefcountbt_maxlevels_ondisk(void);
 int __init xfs_rtrefcountbt_init_cur_cache(void);
 void xfs_rtrefcountbt_destroy_cur_cache(void);
 
+xfs_filblks_t xfs_rtrefcountbt_calc_reserves(struct xfs_mount *mp);
+unsigned long long xfs_rtrefcountbt_calc_size(struct xfs_mount *mp,
+               unsigned long long len);
+
 #endif /* __XFS_RTREFCOUNT_BTREE_H__ */
index e85d2cc60155ce0a96725d1816293f7efd6f366d..81359c9e4c519419ae6d59317c46c55d8acdf504 100644 (file)
@@ -31,6 +31,7 @@
 #include "xfs_rtgroup.h"
 #include "xfs_error.h"
 #include "xfs_trace.h"
+#include "xfs_rtrefcount_btree.h"
 
 /*
  * Return whether there are any free extents in the size range given
@@ -1540,6 +1541,12 @@ xfs_rt_resv_init(
                                ask);
                if (err2 && !error)
                        error = err2;
+
+               ask = xfs_rtrefcountbt_calc_reserves(mp);
+               err2 = xfs_metafile_resv_init(
+                               rtg->rtg_inodes[XFS_RTGI_REFCOUNT], ask);
+               if (err2 && !error)
+                       error = err2;
        }
 
        return error;