Miklos,Vivek, These patches are part of the new overlay "fsnotify snapshot" series I have been working on. Conterary to the trend to disallow underlying offline changes with more configurations, I have seen that some people do want to be able to make some "careful" underlying online changes and survive [1]. In the following patches, I argue for improving the robustness of overlayfs in the face of online underlying changes, but I have not really proved my claims, so feel free to challenge them. I also remember we discussed several times about the conversion of zero return value to -ESTALE, including in the linked thread. I did not change this behavior, but I left a boolean 'strict', which controls this behavior. I am using this boolean to relax strict behavior for snapshot mount later in my snapshot series. Relaxing the strict behavior for other use cases can be considered if someone comes up with a valid use case. Thoughts? Thanks, Amir. [1] https://lore.kernel.org/linux-unionfs/CAOQ4uxiBmFdcueorKV7zwPLCDq4DE+H8x=8H1f7+3v3zysW9qA@xxxxxxxxxxxxxx/ Amir Goldstein (2): ovl: invalidate dentry with deleted real dir ovl: invalidate dentry if lower was renamed fs/overlayfs/export.c | 1 + fs/overlayfs/namei.c | 4 +++- fs/overlayfs/ovl_entry.h | 2 ++ fs/overlayfs/super.c | 48 ++++++++++++++++++++++++++++++---------- 4 files changed, 42 insertions(+), 13 deletions(-) -- 2.17.1
