Messages in this thread | | | Date | Fri, 28 Feb 2020 04:52:55 +0000 | From | Al Viro <> | Subject | Re: [PATCH 00/11] fs/dcache: Limit # of negative dentries |
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On Fri, Feb 28, 2020 at 12:36:09PM +0800, Ian Kent wrote:
> And let's not forget that file systems are the primary > source of these and not all create them on lookups. > I may be mistaken, but I think ext4 does not while xfs > definitely does.
Both ext4 and xfs bloody well *DO* create hashed negative dentries on lookups. There is a pathological case when they are trying to be case-insensitive (and in that situation we are SOL - if somebody insists upon mounting with -o make-it-suck, that's what they bloody well get).
Casefondling idiocy aside, negative lookups are hashed. On all normal filesystems. Look for d_splice_alias() getting passed NULL inode - that's where ->lookup() instances normally create those.
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