@@ -1130,6 +1130,18 @@ xfs_rtbitmap_blockcount(
return howmany_64(rtextents, NBBY * mp->m_sb.sb_blocksize);
}
+/*
+ * Compute the maximum level number of the realtime summary file, as defined by
+ * mkfs. The use of highbit32 on a 64-bit quantity is a historic artifact that
+ * prohibits correct use of rt volumes with more than 2^32 extents.
+ */
+uint8_t
+xfs_compute_rextslog(
+ xfs_rtbxlen_t rtextents)
+{
+ return rtextents ? xfs_highbit32(rtextents) : 0;
+}
+
/*
* Compute the number of rtbitmap words needed to populate every block of a
* bitmap that is large enough to track the given number of rt extents.
@@ -351,6 +351,8 @@ xfs_rtfree_extent(
int xfs_rtfree_blocks(struct xfs_trans *tp, xfs_fsblock_t rtbno,
xfs_filblks_t rtlen);
+uint8_t xfs_compute_rextslog(xfs_rtbxlen_t rtextents);
+
xfs_filblks_t xfs_rtbitmap_blockcount(struct xfs_mount *mp, xfs_rtbxlen_t
rtextents);
unsigned long long xfs_rtbitmap_wordcount(struct xfs_mount *mp,
@@ -25,6 +25,7 @@
#include "xfs_da_format.h"
#include "xfs_health.h"
#include "xfs_ag.h"
+#include "xfs_rtbitmap.h"
/*
* Physical superblock buffer manipulations. Shared with libxfs in userspace.
@@ -509,7 +510,7 @@ xfs_validate_sb_common(
NBBY * sbp->sb_blocksize);
if (sbp->sb_rextents != rexts ||
- sbp->sb_rextslog != xfs_highbit32(sbp->sb_rextents) ||
+ sbp->sb_rextslog != xfs_compute_rextslog(rexts) ||
sbp->sb_rbmblocks != rbmblocks) {
xfs_notice(mp,
"realtime geometry sanity check failed");
@@ -964,7 +964,7 @@ xfs_growfs_rt(
nrextents = nrblocks;
do_div(nrextents, in->extsize);
nrbmblocks = xfs_rtbitmap_blockcount(mp, nrextents);
- nrextslog = xfs_highbit32(nrextents);
+ nrextslog = xfs_compute_rextslog(nrextents);
nrsumlevels = nrextslog + 1;
nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels, nrbmblocks);
nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
@@ -1031,7 +1031,7 @@ xfs_growfs_rt(
nsbp->sb_rblocks = min(nrblocks, nrblocks_step);
nsbp->sb_rextents = xfs_rtb_to_rtx(nmp, nsbp->sb_rblocks);
ASSERT(nsbp->sb_rextents != 0);
- nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
+ nsbp->sb_rextslog = xfs_compute_rextslog(nsbp->sb_rextents);
nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels,
nsbp->sb_rbmblocks);