Hi All,
This is overlay feature set support patches, introduce incompatable,
read-only compatable and incompatable feature set, store on the upper
root dir via "trusted.overlay.feature_[compat|ro_compat|incompat]"
xattrs.
This patch set base on Linux 4.16-rc6.
Patch 1: Implement feature xattr and mount check, refuse mount if no
backward incompatible feature is detected.
Patch 2: Copy up feature xattr from the lower root dirs to the upper
root dir to prevent feature lost.
Patch 3: Add three already support feature: redirect dir, index and
nfs_export, enable them when user give enable mount option.
patch 4: Fix redircet feature once a redirect xattr is detected for
the case of overlay was mounted in the old kernel.
(PS: Not sure this patch is necessary, maybe just give a warning message
and handle this by fsck.overlay? If necessary, check indexdir during
mount time is also necessary too).
zhangyi (F) (4):
ovl: add feature set support
ovl: update features on upper root dir from lower layers
ovl: enable features according to mount options
ovl: fix redirect feature for backward compatibility
fs/overlayfs/namei.c | 12 ++
fs/overlayfs/overlayfs.h | 90 +++++++++++
fs/overlayfs/ovl_entry.h | 18 +++
fs/overlayfs/super.c | 410 ++++++++++++++++++++++++++++++++++++++++++++++-
4 files changed, 525 insertions(+), 5 deletions(-)
--
2.13.6
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