[GIT PULL] overlayfs update for 5.6

[Miklos Szeredi]

Hi Linus,

Please pull from:

  git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git tags/ovl-update-5.6

- Try and preserve holes in sparse files when copying up, thus saving disk
  space and improving performance.

- Fix a performance regression introduced in v4.19 by preserving
  asynchronicity of IO when fowarding to underlying layers.  Add VFS
  helpers to submit async iocbs.

- Fix a regression in lseek(2) introduced in v4.19 that breaks >2G seeks on
  32bit kernels.

- Fix a corner case where st_ino/st_dev was not preserved across copy up.

- Miscellaneous fixes and cleanups.

Thanks,
Miklos

---
Amir Goldstein (7):
      ovl: fix wrong WARN_ON() in ovl_cache_update_ino()
      ovl: use ovl_inode_lock in ovl_llseek()
      ovl: generalize the lower_layers[] array
      ovl: simplify ovl_same_sb() helper
      ovl: generalize the lower_fs[] array
      ovl: fix corner case of conflicting lower layer uuid
      ovl: fix corner case of non-constant st_dev;st_ino

Chengguang Xu (1):
      ovl: improving copy-up efficiency for big sparse file

Jiufei Xue (2):
      vfs: add vfs_iocb_iter_[read|write] helper functions
      ovl: implement async IO routines

Miklos Szeredi (2):
      ovl: layer is const
      ovl: fix lseek overflow on 32bit

Murphy Zhou (1):
      ovl: add splice file read write helper

lijiazi (1):
      ovl: use pr_fmt auto generate prefix

---
 fs/overlayfs/copy_up.c   |  43 ++++++++-
 fs/overlayfs/dir.c       |  10 +-
 fs/overlayfs/export.c    |  28 +++---
 fs/overlayfs/file.c      | 162 +++++++++++++++++++++++++++++---
 fs/overlayfs/inode.c     |  66 ++++++++------
 fs/overlayfs/namei.c     |  38 ++++----
 fs/overlayfs/overlayfs.h |  24 ++++-
 fs/overlayfs/ovl_entry.h |  23 +++--
 fs/overlayfs/readdir.c   |  22 +++--
 fs/overlayfs/super.c     | 233 ++++++++++++++++++++++++++---------------------
 fs/overlayfs/util.c      |  28 ++----
 fs/read_write.c          |  56 ++++++++++++
 include/linux/fs.h       |  16 ++++
 13 files changed, 521 insertions(+), 228 deletions(-)