[RFC PATCH 22/76] vfs: Provide S_CACHE_FILE inode flag

[David Howells]

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@xxxxxxxxxx>
---

 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