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[04/32] vfs: Provide S_CACHE_FILE inode flag

Message ID 159465788421.1376674.17851071117062513659.stgit@warthog.procyon.org.uk (mailing list archive)
State New, archived
Headers show
Series fscache: Rewrite 2: Make the I/O interface use kiocb/iov_iter | expand

Commit Message

David Howells July 13, 2020, 4:31 p.m. UTC 
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@redhat.com>
---

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

diff --git a/include/linux/fs.h b/include/linux/fs.h
index aa3e3af92220..33d30742b26e 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