[RFC,05/61] vfs: Provide S_CACHE_FILE inode flag
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Message ID 158861209000.340223.13332819909017670926.stgit@warthog.procyon.org.uk
State New
Headers show
Series
  • fscache, cachefiles: Rewrite the I/O interface in terms of kiocb/iov_iter
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Commit Message

David Howells May 4, 2020, 5:08 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(+)

Patch
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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