[PATCH 00/20] Support follow_link in RCU-walk - V3

NeilBrown
2015-03-23T02:37:53Z

Hi Al,
thanks for all your review help - particularly the fact that
dentry->d_inode is not stable in RCU-walk. That has lead to
a number of changes.

I think this set addresses all of your review comments, improves
some documentation, and has a go at providing a solution for lustre.

I hope to organize some proper testing soon, so I can confirm that it
makes certain loads a lot faster.

Thanks,
NeilBrown

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NeilBrown (20):
Documentation: remove outdated information from automount-support.txt
STAGING/lustre: limit follow_link recursion using stack space.
VFS: replace {,total_}link_count in task_struct with pointer to nameidata
ovl: rearrange ovl_follow_link to it doesn't need to call ->put_link
VFS: replace nameidata arg to ->put_link with a char*.
SECURITY: remove nameidata arg from inode_follow_link.
VFS: remove nameidata args from ->follow_link
VFS: make all ->follow_link handlers aware for LOOKUP_RCU
security/selinux: pass 'flags' arg to avc_audit() and avc_has_perm_flags()
security: make inode_follow_link RCU-walk aware
VFS/namei: use terminate_walk when symlink lookup fails.
VFS/namei: new flag to support RCU symlinks: LOOKUP_LINK_RCU.
VFS/namei: abort RCU-walk on symlink if atime needs updating.
VFS/namei: add 'inode' arg to put_link().
VFS/namei: enhance follow_link to support RCU-walk.
VFS/namei: enable RCU-walk when following symlinks.
VFS/namei: handle LOOKUP_RCU in page_follow_link_light.
xfs: use RCU to free 'struct xfs_mount'.
XFS: allow follow_link to often succeed in RCU-walk.
NFS: support LOOKUP_RCU in nfs_follow_link.

Documentation/filesystems/Locking | 4
Documentation/filesystems/automount-support.txt | 51 +---
Documentation/filesystems/porting | 23 ++
Documentation/filesystems/vfs.txt | 4
drivers/staging/lustre/lustre/llite/symlink.c | 32 ++-
fs/9p/v9fs.h | 2
fs/9p/vfs_inode.c | 19 +-
fs/9p/vfs_inode_dotl.c | 13 +
fs/autofs4/symlink.c | 6
fs/befs/linuxvfs.c | 19 +-
fs/ceph/inode.c | 7 -
fs/cifs/cifsfs.h | 3
fs/cifs/link.c | 7 -
fs/configfs/symlink.c | 16 +
fs/debugfs/file.c | 5
fs/ecryptfs/inode.c | 16 +
fs/exofs/symlink.c | 8 -
fs/ext2/symlink.c | 7 -
fs/ext3/symlink.c | 7 -
fs/ext4/symlink.c | 7 -
fs/freevxfs/vxfs_immed.c | 12 +
fs/fuse/dir.c | 11 +
fs/gfs2/inode.c | 14 +
fs/hostfs/hostfs_kern.c | 15 +
fs/hppfs/hppfs.c | 13 +
fs/inode.c | 26 ++
fs/jffs2/symlink.c | 10 -
fs/jfs/symlink.c | 7 -
fs/kernfs/symlink.c | 15 +
fs/libfs.c | 4
fs/namei.c | 281 +++++++++++++++--------
fs/nfs/inode.c | 21 ++
fs/nfs/symlink.c | 26 ++
fs/ntfs/namei.c | 1
fs/overlayfs/inode.c | 35 ++-
fs/proc/base.c | 8 -
fs/proc/inode.c | 9 -
fs/proc/namespaces.c | 9 -
fs/proc/self.c | 12 +
fs/proc/thread_self.c | 15 +
fs/sysv/symlink.c | 5
fs/ubifs/file.c | 7 -
fs/ufs/symlink.c | 8 -
fs/xfs/xfs_ioctl.c | 2
fs/xfs/xfs_iops.c | 20 +-
fs/xfs/xfs_mount.h | 2
fs/xfs/xfs_super.c | 4
fs/xfs/xfs_symlink.c | 15 +
fs/xfs/xfs_symlink.h | 2
include/linux/fs.h | 12 -
include/linux/namei.h | 7 -
include/linux/nfs_fs.h | 1
include/linux/sched.h | 3
include/linux/security.h | 13 +
mm/shmem.c | 20 +-
security/capability.c | 4
security/security.c | 7 -
security/selinux/avc.c | 18 +
security/selinux/hooks.c | 21 +-
security/selinux/include/avc.h | 9 +
60 files changed, 632 insertions(+), 348 deletions(-)

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