[PATCH, RFC 1/3] fs: add new open flags O_HOT and O_COLD
From: Theodore Ts'o <tytso@mit.edu>
Date: 2012-04-19 19:20:09
Also in:
linux-fsdevel
Subsystem:
file locking (flock() and fcntl()/lockf()), filesystems (vfs and infrastructure), generic include/asm header files, the rest · Maintainers:
Jeff Layton, Chuck Lever, Alexander Viro, Christian Brauner, Arnd Bergmann, Linus Torvalds
The O_HOT and O_COLD flag are hints to the file system that the file is going to be frequently accessed (a "hot" file) and or very infrequently accessed (a "cold" file). It is up the file system to decide how these flags should be interpreted; in some cases, such as O_HOT, the file system may require appropriate privileges or implement check some kind of per-user quota before deciding to honor the flag. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> --- fs/fcntl.c | 5 +++-- include/asm-generic/fcntl.h | 7 +++++++ 2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 75e7c1f..463352d 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c@@ -835,14 +835,15 @@ static int __init fcntl_init(void) * Exceptions: O_NONBLOCK is a two bit define on parisc; O_NDELAY * is defined as O_NONBLOCK on some platforms and not on others. */ - BUILD_BUG_ON(19 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32( + BUILD_BUG_ON(21 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32( O_RDONLY | O_WRONLY | O_RDWR | O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC | O_APPEND | /* O_NONBLOCK | */ __O_SYNC | O_DSYNC | FASYNC | O_DIRECT | O_LARGEFILE | O_DIRECTORY | O_NOFOLLOW | O_NOATIME | O_CLOEXEC | - __FMODE_EXEC | O_PATH + __FMODE_EXEC | O_PATH | O_HOT | + O_COLD )); fasync_cache = kmem_cache_create("fasync_cache",
diff --git a/include/asm-generic/fcntl.h b/include/asm-generic/fcntl.h
index 9e5b035..1fdcbb1 100644
--- a/include/asm-generic/fcntl.h
+++ b/include/asm-generic/fcntl.h@@ -84,6 +84,13 @@ #define O_PATH 010000000 #endif +#ifndef O_HOT +#define O_HOT 020000000 +#endif +#ifndef O_COLD +#define O_COLD 040000000 +#endif + #ifndef O_NDELAY #define O_NDELAY O_NONBLOCK #endif
--
1.7.10.rc3