On Fri, May 15, 2020 at 10:21 AM Chengguang Xu <cgxu519@xxxxxxxxxxxx> wrote: > > This series adds a new lookup flag LOOKUP_DONTCACHE_NEGATIVE > to indicate to drop negative dentry in slow path of lookup. > > In overlayfs, negative dentries in upper/lower layers are useless > after construction of overlayfs' own dentry, so in order to > effectively reclaim those dentries, specify LOOKUP_DONTCACHE_NEGATIVE > flag when doing lookup in upper/lower layers. > > Patch 1 adds flag LOOKUP_DONTCACHE_NEGATIVE and related logic in vfs layer. > Patch 2 does lookup optimazation for overlayfs. > Patch 3-9 just adjusts function argument when calling > lookup_positive_unlocked() and lookup_one_len_unlocked(). Hmm you cannot do that, build must not be broken mid series. When Miklos said split he meant to patch 1 and 2. Patch 1 must convert all callers to the new argument list, at which point all overlayfs calls are with 0 flags. Once that's done, you may add: Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx> Thanks, Amir.
