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    Subject[PATCH 00/46] rcu-walk and dcache scaling

    git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin.git vfs-scale-working

    Here is an new set of vfs patches for review, not that there was much interest
    last time they were posted. It is structured like:

    * preparation patches
    * introduce new locks to take over dcache_lock, then remove it
    * cleaning up and reworking things for new locks
    * rcu-walk path walking
    * start on some fine grained locking steps

    Thanks,
    Nick


    Nick Piggin (46):
    Revert "fs: use RCU read side protection in d_validate"
    fs: d_validate fixes
    kernel: kmem_ptr_validate considered harmful
    fs: dcache documentation cleanup
    fs: change d_delete semantics
    cifs: dont overwrite dentry name in d_revalidate
    jfs: dont overwrite dentry name in d_revalidate
    fs: change d_compare for rcu-walk
    fs: change d_hash for rcu-walk
    hostfs: simplify locking
    fs: dcache scale hash
    fs: dcache scale lru
    fs: dcache scale dentry refcount
    fs: dcache scale d_unhashed
    fs: dcache scale subdirs
    fs: scale inode alias list
    fs: Use rename lock and RCU for multi-step operations
    fs: increase d_name lock coverage
    fs: dcache remove dcache_lock
    fs: dcache avoid starvation in dcache multi-step operations
    fs: dcache reduce dput locking
    fs: dcache reduce locking in d_alloc
    fs: dcache reduce dcache_inode_lock
    fs: dcache rationalise dget variants
    fs: dcache reduce d_parent locking
    fs: dcache reduce prune_one_dentry locking
    fs: reduce dcache_inode_lock width in lru scanning
    fs: use RCU in shrink_dentry_list to reduce lock nesting
    fs: consolidate dentry kill sequence
    fs: icache RCU free inodes
    fs: avoid inode RCU freeing for pseudo fs
    kernel: optimise seqlock
    fs: rcu-walk for path lookup
    fs: fs_struct use seqlock
    fs: dcache remove d_mounted
    fs: dcache reduce branches in lookup path
    fs: cache optimise dentry and inode for rcu-walk
    fs: prefetch inode data in dcache lookup
    fs: d_revalidate_rcu for rcu-walk
    fs: provide rcu-walk aware permission i_ops
    fs: provide simple rcu-walk ACL implementation
    kernel: add bl_list
    bit_spinlock: add required includes
    fs: dcache per-bucket dcache hash locking
    fs: dcache per-inode inode alias locking
    fs: improve scalability of pseudo filesystems

    Documentation/filesystems/Locking | 23 +-
    Documentation/filesystems/dentry-locking.txt | 174 ----
    Documentation/filesystems/path-lookup.txt | 247 ++++++
    Documentation/filesystems/porting | 45 +-
    Documentation/filesystems/vfs.txt | 54 +-
    arch/ia64/kernel/perfmon.c | 4 +-
    arch/powerpc/platforms/cell/spufs/inode.c | 18 +-
    drivers/infiniband/hw/ipath/ipath_fs.c | 8 +-
    drivers/infiniband/hw/qib/qib_fs.c | 5 +-
    drivers/staging/autofs/root.c | 2 +-
    drivers/staging/pohmelfs/inode.c | 11 +-
    drivers/staging/pohmelfs/path_entry.c | 17 +-
    drivers/staging/smbfs/cache.c | 10 +-
    drivers/usb/core/inode.c | 12 +-
    fs/9p/vfs_dentry.c | 4 +-
    fs/9p/vfs_inode.c | 39 +-
    fs/adfs/dir.c | 13 +-
    fs/adfs/super.c | 11 +-
    fs/affs/amigaffs.c | 4 +-
    fs/affs/namei.c | 66 +-
    fs/affs/super.c | 11 +-
    fs/afs/dir.c | 6 +-
    fs/afs/super.c | 10 +-
    fs/anon_inodes.c | 4 +-
    fs/autofs4/autofs_i.h | 21 +-
    fs/autofs4/expire.c | 143 ++--
    fs/autofs4/inode.c | 2 +-
    fs/autofs4/root.c | 78 +-
    fs/autofs4/waitq.c | 23 +-
    fs/befs/linuxvfs.c | 10 +-
    fs/bfs/inode.c | 9 +-
    fs/block_dev.c | 9 +-
    fs/btrfs/acl.c | 19 +-
    fs/btrfs/ctree.h | 4 +-
    fs/btrfs/export.c | 4 +-
    fs/btrfs/inode.c | 27 +-
    fs/ceph/dir.c | 21 +-
    fs/ceph/inode.c | 27 +-
    fs/ceph/mds_client.c | 2 +-
    fs/cifs/cifsfs.c | 9 +-
    fs/cifs/dir.c | 75 +-
    fs/cifs/inode.c | 14 +-
    fs/cifs/link.c | 4 +-
    fs/cifs/readdir.c | 6 +-
    fs/coda/cache.c | 4 +-
    fs/coda/dir.c | 8 +-
    fs/coda/inode.c | 9 +-
    fs/configfs/configfs_internal.h | 4 +-
    fs/configfs/dir.c | 13 +-
    fs/configfs/inode.c | 8 +-
    fs/dcache.c | 1224 ++++++++++++++++++--------
    fs/ecryptfs/dentry.c | 15 +-
    fs/ecryptfs/inode.c | 8 +-
    fs/ecryptfs/main.c | 4 +-
    fs/ecryptfs/super.c | 12 +-
    fs/efs/super.c | 9 +-
    fs/exofs/super.c | 9 +-
    fs/exportfs/expfs.c | 14 +-
    fs/ext2/acl.c | 11 +-
    fs/ext2/acl.h | 8 +-
    fs/ext2/file.c | 2 +-
    fs/ext2/namei.c | 4 +-
    fs/ext2/super.c | 9 +-
    fs/ext3/acl.c | 11 +-
    fs/ext3/acl.h | 8 +-
    fs/ext3/file.c | 2 +-
    fs/ext3/namei.c | 4 +-
    fs/ext3/super.c | 9 +-
    fs/ext4/acl.c | 11 +-
    fs/ext4/acl.h | 4 +-
    fs/ext4/file.c | 2 +-
    fs/ext4/namei.c | 4 +-
    fs/ext4/super.c | 9 +-
    fs/fat/inode.c | 13 +-
    fs/fat/namei_msdos.c | 24 +-
    fs/fat/namei_vfat.c | 69 +-
    fs/filesystems.c | 3 +
    fs/freevxfs/vxfs_inode.c | 9 +-
    fs/fs_struct.c | 10 +
    fs/fuse/dir.c | 9 +-
    fs/fuse/inode.c | 13 +-
    fs/generic_acl.c | 20 +
    fs/gfs2/dentry.c | 5 +-
    fs/gfs2/export.c | 4 +-
    fs/gfs2/ops_fstype.c | 2 +-
    fs/gfs2/ops_inode.c | 2 +-
    fs/gfs2/super.c | 9 +-
    fs/hfs/dir.c | 2 +-
    fs/hfs/hfs_fs.h | 7 +-
    fs/hfs/string.c | 17 +-
    fs/hfs/super.c | 11 +-
    fs/hfsplus/dir.c | 2 +-
    fs/hfsplus/hfsplus_fs.h | 7 +-
    fs/hfsplus/super.c | 12 +-
    fs/hfsplus/unicode.c | 17 +-
    fs/hostfs/hostfs_kern.c | 37 +-
    fs/hpfs/dentry.c | 26 +-
    fs/hpfs/super.c | 9 +-
    fs/hppfs/hppfs.c | 9 +-
    fs/hugetlbfs/inode.c | 9 +-
    fs/inode.c | 16 +-
    fs/isofs/inode.c | 127 ++--
    fs/isofs/namei.c | 5 +-
    fs/jffs2/super.c | 9 +-
    fs/jfs/namei.c | 60 +-
    fs/jfs/super.c | 12 +-
    fs/libfs.c | 63 +-
    fs/locks.c | 2 +-
    fs/logfs/inode.c | 9 +-
    fs/minix/inode.c | 9 +-
    fs/minix/namei.c | 2 +-
    fs/namei.c | 855 +++++++++++++++----
    fs/namespace.c | 29 +-
    fs/ncpfs/dir.c | 66 +-
    fs/ncpfs/inode.c | 11 +-
    fs/ncpfs/ncplib_kernel.h | 16 +-
    fs/nfs/dir.c | 17 +-
    fs/nfs/getroot.c | 10 +-
    fs/nfs/inode.c | 9 +-
    fs/nfs/namespace.c | 17 +-
    fs/nfs/unlink.c | 2 +-
    fs/nfsd/vfs.c | 5 +-
    fs/nilfs2/super.c | 12 +-
    fs/notify/fsnotify.c | 8 +-
    fs/ntfs/inode.c | 9 +-
    fs/ocfs2/dcache.c | 10 +-
    fs/ocfs2/dlmfs/dlmfs.c | 9 +-
    fs/ocfs2/export.c | 4 +-
    fs/ocfs2/namei.c | 10 +-
    fs/ocfs2/super.c | 9 +-
    fs/openpromfs/inode.c | 9 +-
    fs/pipe.c | 10 +-
    fs/proc/base.c | 14 +-
    fs/proc/generic.c | 4 +-
    fs/proc/inode.c | 9 +-
    fs/proc/proc_sysctl.c | 18 +-
    fs/qnx4/inode.c | 9 +-
    fs/reiserfs/super.c | 9 +-
    fs/reiserfs/xattr.c | 2 +-
    fs/romfs/super.c | 9 +-
    fs/squashfs/super.c | 9 +-
    fs/super.c | 3 +-
    fs/sysfs/dir.c | 22 +-
    fs/sysv/inode.c | 9 +-
    fs/sysv/namei.c | 5 +-
    fs/sysv/super.c | 2 +-
    fs/ubifs/super.c | 10 +-
    fs/udf/super.c | 9 +-
    fs/ufs/super.c | 9 +-
    fs/xfs/linux-2.6/xfs_acl.c | 8 +-
    fs/xfs/linux-2.6/xfs_iops.c | 8 +-
    fs/xfs/xfs_acl.h | 4 +-
    fs/xfs/xfs_iget.c | 13 +-
    include/linux/bit_spinlock.h | 4 +
    include/linux/dcache.h | 183 ++--
    include/linux/fs.h | 61 +-
    include/linux/fs_struct.h | 3 +
    include/linux/fsnotify.h | 2 -
    include/linux/fsnotify_backend.h | 11 +-
    include/linux/generic_acl.h | 1 +
    include/linux/list_bl.h | 141 +++
    include/linux/namei.h | 16 +-
    include/linux/ncp_fs.h | 4 +-
    include/linux/posix_acl.h | 19 +
    include/linux/rculist_bl.h | 128 +++
    include/linux/seqlock.h | 67 ++-
    include/linux/slab.h | 2 -
    ipc/mqueue.c | 9 +-
    kernel/cgroup.c | 29 +-
    mm/filemap.c | 3 -
    mm/shmem.c | 15 +-
    mm/slab.c | 32 +-
    mm/slob.c | 5 -
    mm/slub.c | 40 -
    mm/util.c | 21 -
    net/socket.c | 5 +-
    net/sunrpc/rpc_pipe.c | 14 +-
    security/selinux/selinuxfs.c | 16 +-
    security/tomoyo/realpath.c | 1 +
    179 files changed, 3848 insertions(+), 1711 deletions(-)
    delete mode 100644 Documentation/filesystems/dentry-locking.txt
    create mode 100644 Documentation/filesystems/path-lookup.txt
    create mode 100644 include/linux/list_bl.h
    create mode 100644 include/linux/rculist_bl.h



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