[RFC][PATCH v2 0/3] overlayfs: support freeze/thaw/syncfs

[Amir Goldstein <amir73il@gmail.com>]

Miklos,

Take #2 for overlayfs freeze.

Patch #2 I am quite confident is a bug fix and I have written an
xfs specific test for it.

Patch #1 is a POC of what I think overlay freezing should be like,
although we may want to optimize it with some file flag?

Patch #3 just enables overlayfs freezing with NOP freeze_fs()
unfreeze_fs() operations, so I could test it.  It behaves as
expected - overlay and underlying fs can be frozen independently
and writes continue when both fs are thawed.

I believe that mmap freeze protection is not covered, although I am
not sure exactly how it works?

Am I missing anything else?

Amir Goldstein (3):
  vfs: freeze protect overlay inode on file_start_write()
  ovl: properly implement sync_filesystem()
  ovl: support freeze/thaw super

 fs/overlayfs/super.c | 32 ++++++++++++++++++++++++++++++++
 include/linux/fs.h   | 17 ++++++++++++++++-
 2 files changed, 48 insertions(+), 1 deletion(-)

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2.7.4