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Message-Id: <1384952512-21600-1-git-send-email-miklos@szeredi.hu>
Date: Wed, 20 Nov 2013 14:01:41 +0100
From: Miklos Szeredi <miklos@...redi.hu>
To: viro@...IV.linux.org.uk
Cc: torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, hch@...radead.org,
akpm@...ux-foundation.org, dhowells@...hat.com, zab@...hat.com,
jack@...e.cz, luto@...capital.net, mszeredi@...e.cz
Subject: [PATCH 00/11] cross rename v2
Al,
This series adds a new syscall, renameat2(), which is the same as renameat() but
with a flags argument.
The purpose of extending rename is to add cross-rename, a symmetric variant of
rename, which exchanges the two files. This allows interesting things, which
were not possible before, for example atomically replacing a directory tree with
a symlink, etc... This also allows overlayfs and friends to operate on
whiteouts atomically.
Andy Lutomirski also suggested a "noreplace" flag, which disables the
overwriting behavior of rename.
These two flags, RENAME_EXCHANGE and RENAME_NOREPLACE are only implemented for
ext4 as an example and for testing.
Implementing RENAME_NOREPLACE for other local (disk or ram based) filesystems is
trivial: just don't fail with -EOPNOTSUPP, the rest is done by the VFS. Network
filesystems need special treatment to avoid creation races.
I'm dropping the "rename + link-to-source" idea because it would only be used
for a rare corner case of overlayfs, and which can be worked around in other
ways.
Please consider for -next (3.14).
Git tree is here:
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git cross-rename
Thanks,
Miklos
---
Changes since the previous post:
o Jan Kara reviewed the ext4 bits, thanks!
o Added RENAME_NOREPLACE
o Merged i_op->rename2 into i_op->rename (which results in lots of noise due to
each filesystem's rename needing to be touched)
---
Miklos Szeredi (11):
vfs: add d_is_dir()
vfs: rename: move d_move() up
vfs: rename: use common code for dir and non-dir
vfs: add renameat2 syscall
vfs: add RENAME_NOREPLACE flag
security: add flags to rename hooks
vfs: add cross-rename
ext4: rename: create ext4_renament structure for local vars
ext4: rename: move EMLINK check up
ext4: rename: split out helper functions
ext4: add cross rename support
---
Documentation/filesystems/Locking | 2 +-
Documentation/filesystems/vfs.txt | 4 +-
arch/x86/syscalls/syscall_64.tbl | 1 +
.../lustre/lustre/include/linux/lustre_compat25.h | 4 +-
drivers/staging/lustre/lustre/llite/namei.c | 7 +-
drivers/staging/lustre/lustre/lvfs/lvfs_linux.c | 2 +-
fs/9p/v9fs.h | 3 +-
fs/9p/vfs_inode.c | 7 +-
fs/affs/affs.h | 3 +-
fs/affs/namei.c | 6 +-
fs/afs/dir.c | 9 +-
fs/bad_inode.c | 3 +-
fs/bfs/dir.c | 6 +-
fs/btrfs/inode.c | 6 +-
fs/cachefiles/namei.c | 4 +-
fs/ceph/dir.c | 6 +-
fs/cifs/cifsfs.h | 2 +-
fs/cifs/inode.c | 6 +-
fs/coda/dir.c | 11 +-
fs/dcache.c | 46 ++-
fs/debugfs/inode.c | 2 +-
fs/ecryptfs/inode.c | 8 +-
fs/exofs/namei.c | 6 +-
fs/ext2/namei.c | 8 +-
fs/ext3/namei.c | 8 +-
fs/ext4/namei.c | 379 ++++++++++++++-------
fs/f2fs/namei.c | 6 +-
fs/fat/namei_msdos.c | 6 +-
fs/fat/namei_vfat.c | 6 +-
fs/fuse/dir.c | 9 +-
fs/gfs2/inode.c | 6 +-
fs/hfs/dir.c | 6 +-
fs/hfsplus/dir.c | 6 +-
fs/hostfs/hostfs_kern.c | 8 +-
fs/hpfs/namei.c | 6 +-
fs/jffs2/dir.c | 8 +-
fs/jfs/namei.c | 5 +-
fs/libfs.c | 6 +-
fs/logfs/dir.c | 6 +-
fs/minix/namei.c | 8 +-
fs/namei.c | 316 +++++++++--------
fs/ncpfs/dir.c | 8 +-
fs/nfs/dir.c | 6 +-
fs/nfs/internal.h | 3 +-
fs/nfsd/vfs.c | 2 +-
fs/nilfs2/namei.c | 6 +-
fs/ocfs2/namei.c | 6 +-
fs/omfs/dir.c | 6 +-
fs/reiserfs/namei.c | 6 +-
fs/sysv/namei.c | 8 +-
fs/ubifs/dir.c | 6 +-
fs/udf/namei.c | 6 +-
fs/ufs/namei.c | 6 +-
fs/xfs/xfs_iops.c | 6 +-
include/linux/dcache.h | 8 +-
include/linux/fs.h | 6 +-
include/linux/security.h | 12 +-
include/uapi/linux/fs.h | 3 +
kernel/cgroup.c | 8 +-
mm/shmem.c | 5 +-
security/security.c | 22 +-
61 files changed, 732 insertions(+), 364 deletions(-)
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