Cyrill Gorcunov 0791e3644e kcmp: add KCMP_EPOLL_TFD mode to compare epoll target files ... With current epoll architecture target files are addressed with file_struct and file descriptor number, where the last is not unique. Moreover files can be transferred from another process via unix socket, added into queue and closed then so we won't find this descriptor in the task fdinfo list. Thus to checkpoint and restore such processes CRIU needs to find out where exactly the target file is present to add it into epoll queue. For this sake one can use kcmp call where some particular target file from the queue is compared with arbitrary file passed as an argument. Because epoll target files can have same file descriptor number but different file_struct a caller should explicitly specify the offset within. To test if some particular file is matching entry inside epoll one have to - fill kcmp_epoll_slot structure with epoll file descriptor, target file number and target file offset (in case if only one target is present then it should be 0) - call kcmp as kcmp(pid1, pid2, KCMP_EPOLL_TFD, fd, &kcmp_epoll_slot) - the kernel fetch file pointer matching file descriptor @fd of pid1 - lookups for file struct in epoll queue of pid2 and returns traditional 0,1,2 result for sorting purpose Link: http://lkml.kernel.org/r/20170424154423.511592110@gmail.com Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Andrey Vagin <avagin@openvz.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Pavel Emelyanov <xemul@virtuozzo.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Jason Baron <jbaron@akamai.com> Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-07-12 16:26:01 -07:00
..
9p	9p: Convert to separately allocated bdi	2017-04-20 12:09:55 -06:00
adfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-10-10 20:16:43 -07:00
affs	fs/affs: add rename exchange	2017-05-05 15:24:52 -04:00
afs	afs: Add metadata xattrs	2017-07-09 14:40:12 -07:00
autofs4	Fix up over-eager 'wait_queue_t' renaming	2017-07-10 11:40:19 -07:00
befs	befs: make export work with cold dcache	2017-05-05 11:35:35 +01:00
bfs	bfs: fix sanity checks for empty files	2017-07-12 16:26:00 -07:00
btrfs	Merge branch 'nowait-aio-btrfs-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux	2017-07-10 10:27:48 -07:00
cachefiles	sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming	2017-06-20 12:19:14 +02:00
ceph	ceph: update ceph_dentry_info::lease_session when necessary	2017-07-07 17:25:14 +02:00
cifs	cifs: Clean up unused variables in smb2pdu.c	2017-07-09 23:38:00 -05:00
coda	fs: implement vfs_iter_write using do_iter_write	2017-06-29 17:49:23 -04:00
configfs	configfs: Introduce config_item_get_unless_zero()	2017-06-12 13:20:20 +02:00
cramfs
crypto	The first major feature for ext4 this merge window is the largedir	2017-07-09 09:31:22 -07:00
debugfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
devpts	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-10-10 20:16:43 -07:00
dlm	net: Work around lockdep limitation in sockets that use sockets	2017-03-09 18:23:27 -08:00
ecryptfs	ecryptfs: Convert to separately allocated bdi	2017-04-20 12:09:55 -06:00
efivarfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-10-10 20:16:43 -07:00
efs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
exofs	mm: drop "wait" parameter from write_one_page()	2017-07-05 18:44:22 -04:00
exportfs	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 11:38:56 -08:00
ext2	The first major feature for ext4 this merge window is the largedir	2017-07-09 09:31:22 -07:00
ext4	The first major feature for ext4 this merge window is the largedir	2017-07-09 09:31:22 -07:00
f2fs	for-f2fs-4.13	2017-07-10 14:29:45 -07:00
fat	fat: fix using uninitialized fields of fat_inode/fsinfo_inode	2017-03-09 17:01:10 -08:00
freevxfs
fscache	KEYS: Differentiate uses of rcu_dereference_key() and user_key_payload()	2017-03-02 10:09:00 +11:00
fuse	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2017-05-20 16:12:30 -07:00
gfs2	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
hfs	fs: semove set but not checked AOP_FLAG_UNINTERRUPTIBLE flag	2017-05-08 17:15:14 -07:00
hfsplus	fs: semove set but not checked AOP_FLAG_UNINTERRUPTIBLE flag	2017-05-08 17:15:14 -07:00
hostfs	vfs: remove ".readlink = generic_readlink" assignments	2016-12-09 16:45:04 +01:00
hpfs	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
hugetlbfs	mm: hwpoison: dissolve in-use hugepage in unrecoverable memory error	2017-07-10 16:32:30 -07:00
isofs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
jbd2	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
jffs2	jffs2: fix spelling mistake: "requestied" -> "requested"	2017-04-19 11:35:55 -07:00
jfs	Writeback error handling fixes (pile #1)	2017-07-07 18:39:15 -07:00
kernfs	kernfs: Check KERNFS_HAS_RELEASE before calling kernfs_release_file()	2017-03-17 10:25:59 +09:00
lockd	Another RDMA update from Chuck Lever, and a bunch of miscellaneous	2017-05-10 13:29:23 -07:00
minix	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
ncpfs	mm: per-cgroup memory reclaim stats	2017-07-06 16:24:35 -07:00
nfs	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2017-07-05 11:26:35 -07:00
nfs_common	netns: make struct pernet_operations::id unsigned int	2016-11-18 10:59:15 -05:00
nfsd	Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-05 14:35:57 -07:00
nilfs2	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-07-03 13:08:04 -07:00
nls
notify	dentry name snapshots	2017-07-07 20:09:10 -04:00
ntfs	ntfs: Use ERR_CAST() to avoid cross-structure cast	2017-05-28 10:11:48 -07:00
ocfs2	ocfs2: constify attribute_group structures	2017-07-06 16:24:30 -07:00
omfs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
openpromfs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
orangefs	sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming	2017-06-20 12:19:14 +02:00
overlayfs	ovl: mark parent impure and restore timestamp on ovl_link_up()	2017-07-04 22:08:15 +02:00
proc	sysctl: add unsigned int range support	2017-07-12 16:26:00 -07:00
pstore	pstore: use memdup_user	2017-06-27 17:02:36 -07:00
qnx4
qnx6
quota	quota: add get_inode_usage callback to transfer multi-inode charges	2017-06-22 11:46:48 -04:00
ramfs	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
reiserfs	sched/wait: Rename wait_queue_t => wait_queue_entry_t	2017-06-20 12:18:27 +02:00
romfs	romfs: use different way to generate fsid for BLOCK or MTD	2017-01-24 16:26:14 -08:00
squashfs	fs/pstore: fs/squashfs: change usage of LZ4 to work with new LZ4 version	2017-02-24 17:46:57 -08:00
sysfs	sysfs: be careful of error returns from ops->show()	2017-04-08 17:33:32 +02:00
sysv	mm: drop "wait" parameter from write_one_page()	2017-07-05 18:44:22 -04:00
tracefs	fs: constify tree_descr arrays passed to simple_fill_super()	2017-04-26 23:54:06 -04:00
ubifs	This pull request contains updates for both UBI and UBIFS:	2017-05-13 10:23:12 -07:00
udf	udf: use kmap_atomic for memcpy copying	2017-04-24 16:28:02 +02:00
ufs	Writeback error handling fixes (pile #1)	2017-07-07 18:39:15 -07:00
xfs	Changes for 4.13:	2017-07-10 10:51:53 -07:00
aio.c	fs: add O_DIRECT and aio support for sending down write life time hints	2017-06-27 12:05:36 -06:00
anon_inodes.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
attr.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>	2017-03-02 08:42:29 +01:00
bad_inode.c	statx: Add a system call to make enhanced file info available	2017-03-02 20:51:15 -05:00
binfmt_aout.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
binfmt_elf_fdpic.c	sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>	2017-03-02 08:42:39 +01:00
binfmt_elf.c	binfmt_elf: safely increment argv pointers	2017-07-10 16:32:36 -07:00
binfmt_em86.c
binfmt_flat.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
binfmt_misc.c	fs: constify tree_descr arrays passed to simple_fill_super()	2017-04-26 23:54:06 -04:00
binfmt_script.c
block_dev.c	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
buffer.c	fs/buffer.c: make bh_lru_install() more efficient	2017-07-10 16:32:30 -07:00
char_dev.c	chardev: add helper function to register char devs with a struct device	2017-03-21 06:44:32 +01:00
compat_binfmt_elf.c	fs/binfmt: Convert obsolete cputime type to nsecs	2017-02-01 09:13:51 +01:00
compat_ioctl.c	Merge branch 'work.__copy_in_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:15:02 -07:00
compat.c	fs/compat.c: trim unused includes	2017-04-17 12:52:27 -04:00
coredump.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
dax.c	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
dcache.c	fs/dcache.c: fix spin lockup issue on nlru->lock	2017-07-10 16:32:33 -07:00
dcookies.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
direct-io.c	fs: add O_DIRECT and aio support for sending down write life time hints	2017-06-27 12:05:36 -06:00
drop_caches.c
eventfd.c	There has been a fair amount of activity in the docs tree this time	2017-07-03 21:13:25 -07:00
eventpoll.c	kcmp: add KCMP_EPOLL_TFD mode to compare epoll target files	2017-07-12 16:26:01 -07:00
exec.c	exec: Limit arg stack to at most 75% of _STK_LIM	2017-07-07 20:05:08 -07:00
fcntl.c	vfs: fix flock compat thinko	2017-07-07 13:48:18 -07:00
fhandle.c	fhandle: move compat syscalls from compat.c	2017-04-17 12:52:26 -04:00
file_table.c	fs: new infrastructure for writeback error handling and reporting	2017-07-06 07:02:25 -04:00
file.c	fs/file.c: replace alloc_fdmem() with kvmalloc() alternative	2017-07-06 16:24:30 -07:00
filesystems.c	fs: warn in case userspace lied about modprobe return	2017-06-29 20:05:43 -04:00
fs_pin.c	sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming	2017-06-20 12:19:14 +02:00
fs_struct.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>	2017-03-02 08:42:35 +01:00
fs-writeback.c	fs: add a blank lines on some kernel-doc comments	2017-05-16 08:44:10 -03:00
inode.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
internal.h	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-05-09 09:12:53 -07:00
ioctl.c	sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency	2017-03-02 08:42:37 +01:00
iomap.c	Changes for 4.13:	2017-07-10 10:51:53 -07:00
Kconfig	fs/Kconfig: kill CONFIG_PERCPU_RWSEM some more	2017-07-12 16:26:00 -07:00
Kconfig.binfmt	docs: fix locations of several documents that got moved	2016-10-24 08:12:35 -02:00
libfs.c	fs: convert __generic_file_fsync to use errseq_t based reporting	2017-07-06 07:02:29 -04:00
locks.c	fs/locks: pass kernel struct flock to fcntl_getlk/setlk	2017-05-27 06:07:19 -04:00
Makefile	logfs: remove from tree	2016-12-14 23:48:11 -05:00
mbcache.c	ext4: xattr inode deduplication	2017-06-22 11:44:55 -04:00
mount.h	mnt: In propgate_umount handle visiting mounts in any order	2017-05-23 08:41:16 -05:00
mpage.c	There has been a fair amount of activity in the docs tree this time	2017-07-03 21:13:25 -07:00
namei.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
namespace.c	mm: update callers to use HASH_ZERO flag	2017-07-06 16:24:33 -07:00
no-block.c
nsfs.c	ns: allow ns_entries to have custom symlink content	2017-05-08 17:15:12 -07:00
open.c	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
pipe.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
pnode.c	mnt: Make propagate_umount less slow for overlapping mount propagation trees	2017-05-23 08:41:17 -05:00
pnode.h	mnt: Tuck mounts under others instead of creating shadow/side mounts.	2017-02-04 00:01:06 +13:00
posix_acl.c	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
proc_namespace.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
read_write.c	Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-07 21:48:15 -07:00
readdir.c	readdir: move compat syscalls from compat.c	2017-04-17 12:52:24 -04:00
select.c	Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-06 20:57:13 -07:00
seq_file.c	mm: introduce kv[mz]alloc helpers	2017-05-08 17:15:12 -07:00
signalfd.c	sched/wait: Rename wait_queue_t => wait_queue_entry_t	2017-06-20 12:18:27 +02:00
splice.c	fs: implement vfs_iter_write using do_iter_write	2017-06-29 17:49:23 -04:00
stack.c
stat.c	ufs: restore maintaining ->i_blocks	2017-06-09 16:28:01 -04:00
statfs.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
super.c	bdi: Drop 'parent' argument from bdi_register[_va]()	2017-04-20 12:09:55 -06:00
sync.c	fs: remove call_fsync helper function	2017-07-05 18:44:23 -04:00
timerfd.c	timerfd: Use get_itimerspec64() and put_itimerspec64()	2017-06-30 04:14:38 -04:00
userfaultfd.c	mm/hugetlb: add size parameter to huge_pte_offset()	2017-07-06 16:24:34 -07:00
utimes.c	utimes: move compat syscalls from compat.c	2017-04-17 12:52:23 -04:00
xattr.c	treewide: use kv[mz]alloc* rather than opencoded variants	2017-05-08 17:15:13 -07:00