During the realtime preemption mini-summit we discussed the entire removal of
the big kernel lock. I've started working on this for some filesystems. My plan
is to push the BKL down to the implementations first and remove it from there
later.
This series is pushing the BKL from do_new_mount() down to the filesystems and
removes it from ext series of filesystems and one other trivial use: if the BKL
is only used in get_sb/fill_super due to the push-down, we just need to make
sure that parallel calls to get_sb/fill_super would race against each other.
I addressed the feedback from Matthew Wilcox and tried to be more verbose about
why I think it is safe to remove the BKL. In most cases there is no shared
resource accessed anyway so it is trivially safe to remove the lock.
There are two filesystems where I'm not 100% sure if the proposed patch is
enough, namely btrfs and xfs. Chris(+toph), could you help me here?
I left out the patch to remove default_llseek() on purpose. This indeed needs
some more lovin'.
Comments?
Jan
Jan Blunck (27):
BKL: Push down BKL from do_new_mount() to the filesystems
get_sb/fill_super operation
BKL: Remove outdated comment and include
BKL: Remove BKL from simple_fill_super
ext2: Add ext2_sb_info mutex
BKL: Remove BKL from ext2 filesystem
BKL: Remove BKL from ext3 fill_super()
BKL: Remove BKL from ext3_put_super() and ext3_remount()
BKL: Remove BKL from ext4 filesystem
BKL: Remove BKL from 9p
BKL: Remove BKL from autofs4
BKL: Remove BKL from befs
BKL: Remove BKL from btrfs
BKL: Remove BKL from configfs
BKL: Remove BKL from cramfs
BKL: Remove BKL from devpts
BKL: Remove BKL from efs
BKL: Remove BKL from exofs
BKL: Remove BKL from hostfs
BKL: Remove BKL from hugetlbfs
BKL: Remove BKL from minix
BKL: Remove BKL from omfs
BKL: Remove BKL from openpromfs
BKL: Remove BKL from ramfs
BKL: Remove BKL from romfs
BKL: Remove BKL from sysfs
BKL: Remove BKL from ubifs
BKL: Remove BKL from xfs
fs/adfs/super.c | 8 ++++++-
fs/affs/super.c | 9 +++++++-
fs/afs/super.c | 5 ++++
fs/bfs/inode.c | 9 +++++++-
fs/binfmt_misc.c | 6 ++++-
fs/cifs/cifsfs.c | 12 +++++++++-
fs/coda/inode.c | 8 ++++++-
fs/ecryptfs/main.c | 3 ++
fs/exofs/super.c | 2 +-
fs/ext2/inode.c | 5 +--
fs/ext2/super.c | 48 ++++++++++++++++++++++++++++---------------
fs/ext3/super.c | 12 -----------
fs/ext4/super.c | 11 ----------
fs/fat/namei_msdos.c | 6 ++++-
fs/fat/namei_vfat.c | 6 ++++-
fs/freevxfs/vxfs_super.c | 7 +++++-
fs/fuse/control.c | 9 +++++++-
fs/fuse/inode.c | 5 ++++
fs/gfs2/ops_fstype.c | 9 ++++++++
fs/hfs/super.c | 8 ++++++-
fs/hfsplus/super.c | 8 ++++++-
fs/hpfs/super.c | 8 ++++++-
fs/hppfs/hppfs.c | 4 +++
fs/isofs/inode.c | 8 ++++++-
fs/jffs2/super.c | 11 ++++++++-
fs/jfs/super.c | 14 +++++++++++-
fs/libfs.c | 1 +
fs/namespace.c | 2 -
fs/ncpfs/inode.c | 8 ++++++-
fs/nfs/super.c | 19 +++++++++++++++++
fs/nfsd/nfsctl.c | 7 +++++-
fs/nilfs2/super.c | 9 +++++++-
fs/ntfs/super.c | 5 ++++
fs/ocfs2/dlm/dlmfs.c | 8 ++++++-
fs/ocfs2/super.c | 5 ++++
fs/proc/root.c | 9 +++++++-
fs/qnx4/inode.c | 8 ++++++-
fs/reiserfs/super.c | 4 +++
fs/smbfs/inode.c | 5 ++++
fs/squashfs/super.c | 6 +++++
fs/super.c | 3 --
fs/sysfs/mount.c | 2 +-
fs/sysv/super.c | 24 +++++++++++++++++----
fs/udf/super.c | 8 ++++++-
fs/ufs/super.c | 5 ++++
include/linux/ext2_fs_sb.h | 2 +
46 files changed, 300 insertions(+), 81 deletions(-)
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