linux-kernel - [RFC PATCH 05/61] vfs: Provide S_CACHE

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Message-ID: <158861209000.340223.13332819909017670926.stgit@warthog.procyon.org.uk>
Date:   Mon, 04 May 2020 18:08:10 +0100
From:   David Howells <dhowells@...hat.com>
To:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Jeff Layton <jlayton@...hat.com>
Cc:     dhowells@...hat.com, Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        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 05/61] 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 2d2704aff9df..728eae950dc3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2003,6 +2003,7 @@ struct super_operations {
 #define S_ENCRYPTED	16384	/* Encrypted file (using fs/crypto/) */
 #define S_CASEFOLD	32768	/* Casefolded file */
 #define S_VERITY	65536	/* Verity file (using fs/verity/) */
+#define S_CACHE_FILE	0x20000	/* File is in use as cache file (eg. fs/cachefiles) */
 
 /*
  * Note that nosuid etc flags are inode-specific: setting some file-system