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Filipe Manana 32253c7b40 overlayfs: test fsync on merged directory

Test that calling fsync against a file using the merged directory does
not result in a crash nor fails unexpectedly.

This is motivated by a change in overlayfs that resulted in a crash
(invalid memory access) when the lower or upper directory belonged to
a btrfs file system. The overlayfs change came in commit 4bacc9c9234
(overlayfs: Make f_path always point to the overlay and f_inode to the
underlay). At the moment there are two patches in the linux-fsdevel
and linux-btrfs mailing lists to fix this problem:

  * vfs: add file_dentry()
  * Btrfs: fix crash/invalid memory access on fsync when using overlayfs

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

2016-03-23 17:39:11 +11:00

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	`QA output created by 002`
	`wrote 65536/65536 bytes at offset 0`
	`XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)`