xfs: zero posteof blocks when cloning above eof

When we're reflinking between two files and the destination file range
is well beyond the destination file's EOF marker, zero any posteof
speculative preallocations in the destination file so that we don't
expose stale disk contents.  The previous strategy of trying to clear
the preallocations does not work if the destination file has the
PREALLOC flag set.

Uncovered by shared/010.

Reported-by: Zorro Lang <zlang@redhat.com>
Bugzilla-id: https://bugzilla.kernel.org/show_bug.cgi?id=201259
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

1 files changed, 25 insertions, 8 deletions

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index da1a447bef51..f135748d8282 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1241,6 +1241,26 @@ xfs_reflink_remap_unlock(
 }
 
 /*
+ * If we're reflinking to a point past the destination file's EOF, we must
+ * zero any speculative post-EOF preallocations that sit between the old EOF
+ * and the destination file offset.
+ */
+static int
+xfs_reflink_zero_posteof(
+        struct xfs_inode        *ip,
+        loff_t                  pos)
+{
+        loff_t                  isize = i_size_read(VFS_I(ip));
+
+        if (pos <= isize)
+                return 0;
+
+        trace_xfs_zero_eof(ip, isize, pos - isize);
+        return iomap_zero_range(VFS_I(ip), isize, pos - isize, NULL,
+                        &xfs_iomap_ops);
+}
+
+/*
  * Prepare two files for range cloning.  Upon a successful return both inodes
  * will have the iolock and mmaplock held, the page cache of the out file
  * will be truncated, and any leases on the out file will have been broken.
@@ -1292,15 +1312,12 @@ xfs_reflink_remap_prep(
                 goto out_unlock;
 
         /*
-         * Clear out post-eof preallocations because we don't have page cache
-         * backing the delayed allocations and they'll never get freed on
-         * their own.
+         * Zero existing post-eof speculative preallocations in the destination
+         * file.
          */
-        if (xfs_can_free_eofblocks(dest, true)) {
-                ret = xfs_free_eofblocks(dest);
-                if (ret)
-                        goto out_unlock;
-        }
+        ret = xfs_reflink_zero_posteof(dest, pos_out);
+        if (ret)
+                goto out_unlock;
 
         /* Set flags and remap blocks. */
         ret = xfs_reflink_set_inode_flag(src, dest);