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-rw-r--r--fs/xfs/libxfs/xfs_errortag.h4
-rw-r--r--fs/xfs/libxfs/xfs_inode_fork.c4
2 files changed, 7 insertions, 1 deletions
diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h
index 53b305dea381..1c56fcceeea6 100644
--- a/fs/xfs/libxfs/xfs_errortag.h
+++ b/fs/xfs/libxfs/xfs_errortag.h
@@ -56,7 +56,8 @@
#define XFS_ERRTAG_FORCE_SUMMARY_RECALC 33
#define XFS_ERRTAG_IUNLINK_FALLBACK 34
#define XFS_ERRTAG_BUF_IOERROR 35
-#define XFS_ERRTAG_MAX 36
+#define XFS_ERRTAG_REDUCE_MAX_IEXTENTS 36
+#define XFS_ERRTAG_MAX 37
/*
* Random factors for above tags, 1 means always, 2 means 1/2 time, etc.
@@ -97,5 +98,6 @@
#define XFS_RANDOM_FORCE_SUMMARY_RECALC 1
#define XFS_RANDOM_IUNLINK_FALLBACK (XFS_RANDOM_DEFAULT/10)
#define XFS_RANDOM_BUF_IOERROR XFS_RANDOM_DEFAULT
+#define XFS_RANDOM_REDUCE_MAX_IEXTENTS 1
#endif /* __XFS_ERRORTAG_H_ */
diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c
index 8d48716547e5..e080d7e07643 100644
--- a/fs/xfs/libxfs/xfs_inode_fork.c
+++ b/fs/xfs/libxfs/xfs_inode_fork.c
@@ -24,6 +24,7 @@
#include "xfs_dir2_priv.h"
#include "xfs_attr_leaf.h"
#include "xfs_types.h"
+#include "xfs_errortag.h"
kmem_zone_t *xfs_ifork_zone;
@@ -745,6 +746,9 @@ xfs_iext_count_may_overflow(
max_exts = (whichfork == XFS_ATTR_FORK) ? MAXAEXTNUM : MAXEXTNUM;
+ if (XFS_TEST_ERROR(false, ip->i_mount, XFS_ERRTAG_REDUCE_MAX_IEXTENTS))
+ max_exts = 10;
+
nr_exts = ifp->if_nextents + nr_to_add;
if (nr_exts < ifp->if_nextents || nr_exts > max_exts)
return -EFBIG;