linux-kernel - [RFC PATCH 22/76] vfs: Provide S_CACHE

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Message-ID: <160588483671.3465195.4384812052790548928.stgit@warthog.procyon.org.uk>
Date:   Fri, 20 Nov 2020 15:07:16 +0000
From:   David Howells <dhowells@...hat.com>
To:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>
Cc:     dhowells@...hat.com, Jeff Layton <jlayton@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-cachefs@...hat.com, linux-afs@...ts.infradead.org,
        linux-nfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        ceph-devel@...r.kernel.org, v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 22/76] vfs: Provide S_CACHE_FILE inode flag

Provide an S_CACHE_FILE inode flag that cachefiles can set to ward off
other kernel services and drivers (including itself) from using its cache
files.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 include/linux/fs.h |    1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 52fb357579c8..f6dad577ea07 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1991,6 +1991,7 @@ 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_CACHE_FILE	(1 << 17) /* File is in use as cache file (eg. fs/cachefiles) */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system