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[68.20.15.154]) by smtp.gmail.com with ESMTPSA id d23sm7885414qtm.11.2021.10.19.11.10.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 19 Oct 2021 11:10:21 -0700 (PDT) Message-ID: <39bc040e9bb88b47f386baa09ed4a508281ce7d6.camel@redhat.com> Subject: Re: [PATCH 02/67] vfs: Provide S_KERNEL_FILE inode flag From: Jeff Layton To: David Howells , linux-cachefs@redhat.com Cc: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Matthew Wilcox , Alexander Viro , Omar Sandoval , Linus Torvalds , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 19 Oct 2021 14:10:19 -0400 In-Reply-To: <163456865277.2614702.2064731306330022896.stgit@warthog.procyon.org.uk> References: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> <163456865277.2614702.2064731306330022896.stgit@warthog.procyon.org.uk> Content-Type: text/plain; charset="ISO-8859-15" User-Agent: Evolution 3.40.4 (3.40.4-2.fc34) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org On Mon, 2021-10-18 at 15:50 +0100, David Howells wrote: > Provide an S_KERNEL_FILE inode flag that a kernel service, e.g. cachefiles, > can set to ward off other kernel services and drivers (including itself) > from using files it is actively using. > > Signed-off-by: David Howells > --- > > include/linux/fs.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/linux/fs.h b/include/linux/fs.h > index e7a633353fd2..197493507744 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -2250,6 +2250,7 @@ struct super_operations { > #define S_ENCRYPTED (1 << 14) /* Encrypted file (using fs/crypto/) */ > #define S_CASEFOLD (1 << 15) /* Casefolded file */ > #define S_VERITY (1 << 16) /* Verity file (using fs/verity/) */ > +#define S_KERNEL_FILE (1 << 17) /* File is in use by the kernel (eg. fs/cachefiles) */ > > /* > * Note that nosuid etc flags are inode-specific: setting some file-system > > It'd be better to fold this in with the patch where the first user is added. That would make it easier to see how you intend to use it. -- Jeff Layton