On Fri, Jan 19, 2018 at 9:10 PM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> On Fri, Jan 19, 2018 at 1:07 PM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:
>> On Fri, Jan 19, 2018 at 12:39 PM, Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
>>> On Fri, Jan 19, 2018 at 02:23:35AM +0200, Amir Goldstein wrote:
>>>> > How is this for an option?
>>> [...]
>>>> > +struct dentry *d_obtain_alias_fsdata(struct inode *inode, void **fsdata)
>>>> > +{
>>>> > + return __d_obtain_alias(inode, 1, fsdata);
>>>> > }
>>>> > EXPORT_SYMBOL(d_obtain_alias);
>>>
>>> It would work, but I like this interface better:
>>>
>>> +extern struct dentry * d_alloc_anon(struct super_block *);
>>> +extern struct dentry * d_instantiate_anon(struct dentry *, struct inode *);
>>>
>>
>> OK. Thanks for the patch!
>>
>
> Added your dcache patch to the series and reworked my patches
> to use the new helpers.
>
> Tested result is pushed to:
> https://github.com/amir73il/linux/commits/ovl-nfs-export-v3
>
> Prep patches changes since v2:
> - Rebased over fix patch "hash all directory inodes for fsnotify"
> - Rename mount/config option from "verify" to "nfs_export"
> - Force r/o mount when index dir creation fails
> - Allow enabling "nfs_export" for non-upper mount
> - Require "redirect_dir=nofollow" for non-upper mount
> - Rename dir index entries xattr from ".origin" to ".upper"
> - Re-factor ovl_{get|set|verify}_origin() helpers
> - Simplify test for temp index name (starts with #)
> - Abandon ovl_dentry_is_renamed() test for lower st_ino
> - Document overhead on mount with full index
> - Document change of behavior when verifying lower origin
> - Added patch to make room in ovl_entry struct
>
> NFS export changes since v2:
> - Fix exportfs ops for r/o overlay with no upperdir
> - Document reason for copy up directory on encode
> - Take care of racing with rename while connecting dir
> - Explain the reasons for choosing the 'connected' dir approach
> - Do not add dentry without ovl_entry to dcache
>
> Optimizations TODO:
> - Copy up on encode only when lower ancestor is below middle layer redirect
> - Hash inode by fh to avoid origin decode of whiteout fh
>
> As far as I know, the series is now functionally correct and all comments
> so far addressed. The remaining optimizations will be done on top of this
> series.
Pushed to overlayfs-next with one fix (do not warn about falling back
to nfs_export=off if nfs_export is already off).
That spurious warning makes me wonder: how much of the option matrix is tested?
Thanks,
Miklos
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