Eric W. Biederman eedf265aa0 devpts: Make each mount of devpts an independent filesystem. ... The /dev/ptmx device node is changed to lookup the directory entry "pts" in the same directory as the /dev/ptmx device node was opened in. If there is a "pts" entry and that entry is a devpts filesystem /dev/ptmx uses that filesystem. Otherwise the open of /dev/ptmx fails. The DEVPTS_MULTIPLE_INSTANCES configuration option is removed, so that userspace can now safely depend on each mount of devpts creating a new instance of the filesystem. Each mount of devpts is now a separate and equal filesystem. Reserved ttys are now available to all instances of devpts where the mounter is in the initial mount namespace. A new vfs helper path_pts is introduced that finds a directory entry named "pts" in the directory of the passed in path, and changes the passed in path to point to it. The helper path_pts uses a function path_parent_directory that was factored out of follow_dotdot. In the implementation of devpts: - devpts_mnt is killed as it is no longer meaningful if all mounts of devpts are equal. - pts_sb_from_inode is replaced by just inode->i_sb as all cached inodes in the tty layer are now from the devpts filesystem. - devpts_add_ref is rolled into the new function devpts_ptmx. And the unnecessary inode hold is removed. - devpts_del_ref is renamed devpts_release and reduced to just a deacrivate_super. - The newinstance mount option continues to be accepted but is now ignored. In devpts_fs.h definitions for when !CONFIG_UNIX98_PTYS are removed as they are never used. Documentation/filesystems/devices.txt is updated to describe the current situation. This has been verified to work properly on openwrt-15.05, centos5, centos6, centos7, debian-6.0.2, debian-7.9, debian-8.2, ubuntu-14.04.3, ubuntu-15.10, fedora23, magia-5, mint-17.3, opensuse-42.1, slackware-14.1, gentoo-20151225 (13.0?), archlinux-2015-12-01. With the caveat that on centos6 and on slackware-14.1 that there wind up being two instances of the devpts filesystem mounted on /dev/pts, the lower copy does not end up getting used. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Greg KH <greg@kroah.com> Cc: Peter Hurley <peter@hurleysoftware.com> Cc: Peter Anvin <hpa@zytor.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Serge Hallyn <serge.hallyn@ubuntu.com> Cc: Willy Tarreau <w@1wt.eu> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> Cc: Jann Horn <jann@thejh.net> Cc: Jiri Slaby <jslaby@suse.com> Cc: Florian Weimer <fw@deneb.enyo.de> Cc: Konstantin Khlebnikov <koct9i@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-06-05 10:36:01 -07:00
..
9p	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
adfs	…
affs	affs: fix remount failure when there are no options changed	2016-05-28 16:50:24 -07:00
afs	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
autofs4	dcache_{readdir,dir_lseek}() users: switch to ->iterate_shared	2016-05-02 19:49:32 -04:00
befs	fs/befs/io.c:befs_bread(): remove unneeded initialization to NULL	2016-05-23 17:04:14 -07:00
bfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
btrfs	Merge branch 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2016-06-04 11:56:28 -07:00
cachefiles	FS-Cache: make check_consistency callback return int	2016-06-01 10:29:39 +02:00
ceph	ceph: use i_version to check validity of fscache	2016-06-01 10:32:14 +02:00
cifs	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
coda	introduce a parallel variant of ->iterate()	2016-05-02 19:49:29 -04:00
configfs	configfs_readdir(): make safe under shared lock	2016-05-09 11:41:13 -04:00
cramfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
crypto	fscrypto/f2fs: allow fs-specific key prefix for fs encryption	2016-05-07 10:32:33 -07:00
debugfs	Merge 4.6-rc4 into driver-core-next	2016-04-19 04:28:28 +09:00
devpts	devpts: Make each mount of devpts an independent filesystem.	2016-06-05 10:36:01 -07:00
dlm	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
ecryptfs	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
efivarfs	fs/efivarfs/inode.c: use generic UUID library	2016-05-20 17:58:30 -07:00
efs	fs/efs/super.c: fix return value	2016-05-20 17:58:30 -07:00
exofs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2016-05-17 17:05:30 -07:00
exportfs	introduce a parallel variant of ->iterate()	2016-05-02 19:49:29 -04:00
ext2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-27 17:14:05 -07:00
ext4	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-27 17:14:05 -07:00
f2fs	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
fat	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
freevxfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
fscache	FS-Cache: wake write waiter after invalidating writes	2016-06-01 10:29:09 +02:00
fuse	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
gfs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-27 17:14:05 -07:00
hfs	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
hfsplus	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
hostfs	hostfs: switch to ->iterate_shared()	2016-05-12 19:49:30 -04:00
hpfs	hpfs: implement the show_options method	2016-05-28 16:50:24 -07:00
hugetlbfs	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
isofs	Merge branch 'ovl-fixes' into for-linus	2016-05-11 00:00:29 -04:00
jbd2	Fix a number of bugs, most notably a potential stale data exposure	2016-05-24 12:55:26 -07:00
jffs2	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
jfs	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
kernfs	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
lockd	…
logfs	logfs: no need to lock directory in lseek	2016-05-09 11:42:19 -04:00
minix	simple local filesystems: switch to ->iterate_shared()	2016-05-02 19:49:32 -04:00
ncpfs	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
nfs	nfs: fix anonymous member initializer build failure with older compilers	2016-05-27 17:20:27 -07:00
nfs_common	…
nfsd	A very quiet cycle for nfsd, mainly just an RDMA update from Chuck Lever.	2016-05-24 14:39:20 -07:00
nilfs2	nilfs2: fix block comments	2016-05-23 17:04:14 -07:00
nls	…
notify	fsnotify: avoid spurious EMFILE errors from inotify_init()	2016-05-19 19:12:14 -07:00
ntfs	fs: simplify the generic_write_sync prototype	2016-05-01 19:58:39 -04:00
ocfs2	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-27 17:14:05 -07:00
omfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
openpromfs	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
orangefs	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
overlayfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-27 17:14:05 -07:00
proc	mm, proc: make clear_refs killable	2016-05-23 17:04:14 -07:00
pstore	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
qnx4	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
qnx6	more trivial ->iterate_shared conversions	2016-05-09 11:41:14 -04:00
quota	fs/quota: use nla_put_u64_64bit()	2016-04-26 12:00:48 -04:00
ramfs	tmpfs/ramfs: fix VM_MAYSHARE mappings for NOMMU	2016-05-20 17:58:30 -07:00
reiserfs	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
romfs	romfs, squashfs: switch to ->iterate_shared()	2016-05-09 11:41:15 -04:00
squashfs	romfs, squashfs: switch to ->iterate_shared()	2016-05-09 11:41:15 -04:00
sysfs	…
sysv	simple local filesystems: switch to ->iterate_shared()	2016-05-02 19:49:32 -04:00
tracefs	…
ubifs	This pull request contains mostly cleanups and minor	2016-05-27 18:49:29 -07:00
udf	Merge branch 'work.preadv2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 15:05:23 -07:00
ufs	simple local filesystems: switch to ->iterate_shared()	2016-05-02 19:49:32 -04:00
xfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-27 17:14:05 -07:00
Kconfig	dax: Make huge page handling depend of CONFIG_BROKEN	2016-05-19 15:13:17 -06:00
Kconfig.binfmt	ELF/MIPS build fix	2016-05-23 17:04:14 -07:00
Makefile	Merge tag 'ofs-pull-tag-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubcap/linux	2016-03-26 12:59:04 -07:00
aio.c	aio: make aio_setup_ring killable	2016-05-23 17:04:14 -07:00
anon_inodes.c	…
attr.c	…
bad_inode.c	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
binfmt_aout.c	fs: fix binfmt_aout.c build error	2016-05-28 16:34:59 -07:00
binfmt_elf.c	mm: remove more IS_ERR_VALUE abuses	2016-05-27 15:57:31 -07:00
binfmt_elf_fdpic.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 11:51:59 -07:00
binfmt_em86.c	…
binfmt_flat.c	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
binfmt_misc.c	…
binfmt_script.c	…
block_dev.c	DAX error handling for 4.7	2016-05-26 19:34:26 -07:00
buffer.c	mm, page_alloc: avoid looking up the first zone in a zonelist twice	2016-05-19 19:12:14 -07:00
char_dev.c	chrdev: emit a warning when we go below dynamic major range	2016-03-29 10:11:44 -07:00
compat.c	Fix a number of bugs, most notably a potential stale data exposure	2016-05-24 12:55:26 -07:00
compat_binfmt_elf.c	…
compat_ioctl.c	Merge 4.5-rc4 into char-misc-next	2016-02-14 14:25:59 -08:00
coredump.c	coredump: make coredump_wait wait for mmap_sem for write killable	2016-05-23 17:04:14 -07:00
dax.c	Filesystem DAX locking for 4.7	2016-05-26 20:00:28 -07:00
dcache.c	Merge branch 'hash' of git://ftp.sciencehorizons.net/linux	2016-05-28 16:15:25 -07:00
dcookies.c	…
direct-io.c	direct-io: fix direct write stale data exposure from concurrent buffered read	2016-05-27 14:49:37 -07:00
drop_caches.c	…
eventfd.c	eventfd: document lockless access in eventfd_poll	2016-03-22 15:36:02 -07:00
eventpoll.c	fs: poll/select/recvmmsg: use timespec64 for timeout events	2016-05-19 19:12:14 -07:00
exec.c	exec: make exec path waiting for mmap_sem killable	2016-05-23 17:04:14 -07:00
fcntl.c	…
fhandle.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-03-22 15:36:02 -07:00
file.c	give readdir(2)/getdents(2)/etc. uniform exclusion with lseek()	2016-05-02 19:49:28 -04:00
file_table.c	…
filesystems.c	…
fs-writeback.c	mm,writeback: don't use memory reserves for wb_start_writeback	2016-05-20 17:58:30 -07:00
fs_pin.c	…
fs_struct.c	…
inode.c	parallel lookups: actual switch to rwsem	2016-05-02 19:49:28 -04:00
internal.h	…
ioctl.c	…
libfs.c	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00
locks.c	…
mbcache.c	mbcache: add reusable flag to cache entries	2016-02-22 22:44:04 -05:00
mount.h	…
mpage.c	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
namei.c	devpts: Make each mount of devpts an independent filesystem.	2016-06-05 10:36:01 -07:00
namespace.c	…
no-block.c	…
nsfs.c	…
open.c	Merge branch 'work.const-path' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-17 14:41:03 -07:00
pipe.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
pnode.c	propogate_mnt: Handle the first propogated copy being a slave	2016-05-05 09:54:45 -05:00
pnode.h	…
posix_acl.c	switch xattr_handler->set() to passing dentry and inode separately	2016-05-27 15:39:43 -04:00
proc_namespace.c	vfs: show_vfsstat: do not ignore errors from show_devname method	2016-03-16 13:09:08 -04:00
read_write.c	Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-05-18 11:46:23 -07:00
readdir.c	restore killability of old mutex_lock_killable(&inode->i_mutex) users	2016-05-26 00:13:25 -04:00
select.c	fs: poll/select/recvmmsg: use timespec64 for timeout events	2016-05-19 19:12:14 -07:00
seq_file.c	Make file credentials available to the seqfile interfaces	2016-04-14 12:56:09 -07:00
signalfd.c	…
splice.c	Merge branch 'ovl-fixes' into for-linus	2016-05-11 00:00:29 -04:00
stack.c	…
stat.c	…
statfs.c	…
super.c	Merge branch 'master' into for-next	2016-04-18 11:18:55 +02:00
sync.c	mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros	2016-04-04 10:41:08 -07:00
timerfd.c	…
userfaultfd.c	userfaultfd: don't pin the user memory in userfaultfd_file_create()	2016-05-20 17:58:30 -07:00
utimes.c	…
xattr.c	switch ->setxattr() to passing dentry and inode separately	2016-05-27 20:09:16 -04:00