[PATCH] xfs: reallocate realtime summary cache on growfs

[Omar Sandoval <osandov@xxxxxxxxxxx>]

From: Omar Sandoval <osandov@xxxxxx>

At mount time, we allocate m_rsum_cache with the number of realtime
bitmap blocks. However, xfs_growfs_rt() can increase the number of
realtime bitmap blocks. Using the cache after this happens may access
out of the bounds of the cache. Fix it by reallocating the cache in this
case.

Fixes: 355e3532132b ("xfs: cache minimum realtime summary level")
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
---
Hi,

This is a quick for for my previous patch which is queued up for 4.21,
based on xfs-linux/for-next. This is bad timing with the holidays coming
up, but growfs on a realtime volume is probably pretty rare :)

Thanks!

 fs/xfs/xfs_rtalloc.c | 44 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 36 insertions(+), 8 deletions(-)

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index afe4d29f7ab4..ac0fcdad0c4e 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -861,6 +861,21 @@ xfs_growfs_rt_alloc(
 	return error;
 }
 
+static void
+xfs_alloc_rsum_cache(
+	xfs_mount_t	*mp,		/* file system mount structure */
+	xfs_extlen_t	rbmblocks)	/* number of rt bitmap blocks */
+{
+	/*
+	 * The rsum cache is initialized to all zeroes, which is trivially a
+	 * lower bound on the minimum level with any free extents. We can
+	 * continue without the cache if it couldn't be allocated.
+	 */
+	mp->m_rsum_cache = kmem_zalloc_large(rbmblocks, KM_SLEEP);
+	if (!mp->m_rsum_cache)
+		xfs_warn(mp, "could not allocate realtime summary cache");
+}
+
 /*
  * Visible (exported) functions.
  */
@@ -889,6 +904,7 @@ xfs_growfs_rt(
 	xfs_extlen_t	rsumblocks;	/* current number of rt summary blks */
 	xfs_sb_t	*sbp;		/* old superblock */
 	xfs_fsblock_t	sumbno;		/* summary block number */
+	uint8_t		*rsum_cache;	/* old summary cache */
 
 	sbp = &mp->m_sb;
 	/*
@@ -945,6 +961,11 @@ xfs_growfs_rt(
 	error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
 	if (error)
 		return error;
+
+	rsum_cache = mp->m_rsum_cache;
+	if (nrbmblocks != sbp->sb_rbmblocks)
+		xfs_alloc_rsum_cache(mp, nrbmblocks);
+
 	/*
 	 * Allocate a new (fake) mount/sb.
 	 */
@@ -1070,6 +1091,20 @@ xfs_growfs_rt(
 	 */
 	kmem_free(nmp);
 
+	/*
+	 * If we had to allocate a new rsum_cache, we either need to free the
+	 * old one (if we succeeded) or free the new one and restore the old one
+	 * (if there was an error).
+	 */
+	if (rsum_cache != mp->m_rsum_cache) {
+		if (error) {
+			kmem_free(mp->m_rsum_cache);
+			mp->m_rsum_cache = rsum_cache;
+		} else {
+			kmem_free(rsum_cache);
+		}
+	}
+
 	return error;
 }
 
@@ -1217,14 +1252,7 @@ xfs_rtmount_inodes(
 		return error;
 	}
 	ASSERT(mp->m_rsumip != NULL);
-	/*
-	 * The rsum cache is initialized to all zeroes, which is trivially a
-	 * lower bound on the minimum level with any free extents. We can
-	 * continue without the cache if it couldn't be allocated.
-	 */
-	mp->m_rsum_cache = kmem_zalloc_large(sbp->sb_rbmblocks, KM_SLEEP);
-	if (!mp->m_rsum_cache)
-		xfs_warn(mp, "could not allocate realtime summary cache");
+	xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
 	return 0;
 }
 
-- 
2.20.1