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-rw-r--r--fs/xfs/xfs_iomap.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index add06b4e9a63..364818eef40e 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -351,6 +351,15 @@ xfs_iomap_prealloc_size(
}
if (shift)
alloc_blocks >>= shift;
+
+ /*
+ * If we are still trying to allocate more space than is
+ * available, squash the prealloc hard. This can happen if we
+ * have a large file on a small filesystem and the above
+ * lowspace thresholds are smaller than MAXEXTLEN.
+ */
+ while (alloc_blocks >= freesp)
+ alloc_blocks >>= 4;
}
if (alloc_blocks < mp->m_writeio_blocks)