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Message-ID: <20171018065938.GA15310@infradead.org> Date: Tue, 17 Oct 2017 23:59:38 -0700 From: "hch@...radead.org" <hch@...radead.org> To: Jan Kara <jack@...e.cz> Cc: "hch@...radead.org" <hch@...radead.org>, "Williams, Dan J" <dan.j.williams@...el.com>, "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>, "darrick.wong@...cle.com" <darrick.wong@...cle.com>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "luto@...nel.org" <luto@...nel.org>, "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>, "ross.zwisler@...ux.intel.com" <ross.zwisler@...ux.intel.com>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, "tytso@....edu" <tytso@....edu>, "arnd@...db.de" <arnd@...db.de> Subject: Re: [PATCH 01/19] mm: introduce MAP_SHARED_VALIDATE, a mechanism to safely define new mmap flags On Tue, Oct 17, 2017 at 01:50:47PM +0200, Jan Kara wrote: > OK, I can do that. But I had just realized that if MAP_DIRECT isn't going > to end up using mmap(2) interface but something else (and I'm not sure > where discussions on this matter ended), we don't need flags argument for > ->mmap at all. MAP_SYNC uses a VMA flag anyway and thus it is fine with the > current ->mmap interface. We still need some opt-in mechanism for > MAP_SHARED_VALIDATE though (probably supported mmap flags as Dan had in one > version of his patch). Thoughts on which way to go for now? Yes, I'd much prefer the mmap_flags in file_operations. The other option would be a new FMODE_* flag which is what Al did for various other optional features, but I generally thing that is a confusing interface.
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