From: Theodore Ts'o Subject: [PATCH, RFC 0/3] Introduce new O_HOT and O_COLD flags Date: Thu, 19 Apr 2012 15:20:08 -0400 Message-ID: <1334863211-19504-1-git-send-email-tytso@mit.edu> Cc: Ext4 Developers List , Theodore Ts'o To: linux-fsdevel@vger.kernel.org Return-path: Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org As I had brought up during one of the lightning talks at the Linux Storage and Filesystem workshop, I am interested in introducing two new open flags, O_HOT and O_COLD. These flags are passed down to the individual file system's inode operations' create function, and the file system can use these flags as a hint regarding whether the file is likely to be accessed frequently or not. In the future I plan to do further work on how ext4 would use these flags, but I want to first get the ability to pass these flags plumbed into the VFS layer and the code points for O_HOT and O_COLD reserved. Theodore Ts'o (3): fs: add new open flags O_HOT and O_COLD fs: propagate the open_flags structure down to the low-level fs's create() ext4: use the O_HOT and O_COLD open flags to influence inode allocation fs/9p/vfs_inode.c | 2 +- fs/affs/affs.h | 2 +- fs/affs/namei.c | 3 ++- fs/bfs/dir.c | 2 +- fs/btrfs/inode.c | 3 ++- fs/cachefiles/namei.c | 3 ++- fs/ceph/dir.c | 2 +- fs/cifs/dir.c | 2 +- fs/coda/dir.c | 3 ++- fs/ecryptfs/inode.c | 5 +++-- fs/exofs/namei.c | 2 +- fs/ext2/namei.c | 4 +++- fs/ext3/namei.c | 5 +++-- fs/ext4/ext4.h | 8 +++++++- fs/ext4/ialloc.c | 33 +++++++++++++++++++++++++++------ fs/ext4/migrate.c | 2 +- fs/ext4/namei.c | 17 ++++++++++++----- fs/fat/namei_msdos.c | 2 +- fs/fat/namei_vfat.c | 2 +- fs/fcntl.c | 5 +++-- fs/fuse/dir.c | 2 +- fs/gfs2/inode.c | 3 ++- fs/hfs/dir.c | 2 +- fs/hfsplus/dir.c | 5 +++-- fs/hostfs/hostfs_kern.c | 2 +- fs/hugetlbfs/inode.c | 4 +++- fs/internal.h | 6 ------ fs/jffs2/dir.c | 5 +++-- fs/jfs/namei.c | 2 +- fs/logfs/dir.c | 2 +- fs/minix/namei.c | 2 +- fs/namei.c | 9 +++++---- fs/ncpfs/dir.c | 5 +++-- fs/nfs/dir.c | 6 ++++-- fs/nfsd/vfs.c | 4 ++-- fs/nilfs2/namei.c | 2 +- fs/ocfs2/namei.c | 3 ++- fs/omfs/dir.c | 2 +- fs/ramfs/inode.c | 3 ++- fs/reiserfs/namei.c | 5 +++-- fs/sysv/namei.c | 4 +++- fs/ubifs/dir.c | 2 +- fs/udf/namei.c | 2 +- fs/ufs/namei.c | 2 +- fs/xfs/xfs_iops.c | 3 ++- include/asm-generic/fcntl.h | 7 +++++++ include/linux/fs.h | 14 ++++++++++++-- ipc/mqueue.c | 2 +- 48 files changed, 143 insertions(+), 74 deletions(-) -- 1.7.10.rc3