#undef TRACE_SYSTEM #define TRACE_SYSTEM power #if !defined(_TRACE_POWER_CPU_MIGRATE_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_POWER_CPU_MIGRATE_H #include #define __cpu_migrate_proto \ TP_PROTO(u64 timestamp, \ u32 cpu_hwid) #define __cpu_migrate_args \ TP_ARGS(timestamp, \ cpu_hwid) DECLARE_EVENT_CLASS(cpu_migrate, __cpu_migrate_proto, __cpu_migrate_args, TP_STRUCT__entry( __field(u64, timestamp ) __field(u32, cpu_hwid ) ), TP_fast_assign( __entry->timestamp = timestamp; __entry->cpu_hwid = cpu_hwid; ), TP_printk("timestamp=%llu cpu_hwid=0x%08lX", (unsigned long long)__entry->timestamp, (unsigned long)__entry->cpu_hwid ) ); #define __define_cpu_migrate_event(name) \ DEFINE_EVENT(cpu_migrate, cpu_migrate_##name, \ __cpu_migrate_proto, \ __cpu_migrate_args \ ) __define_cpu_migrate_event(begin); __define_cpu_migrate_event(finish); __define_cpu_migrate_event(current); #undef __define_cpu_migrate #undef __cpu_migrate_proto #undef __cpu_migrate_args /* This file can get included multiple times, TRACE_HEADER_MULTI_READ at top */ #ifndef _PWR_CPU_MIGRATE_EVENT_AVOID_DOUBLE_DEFINING #define _PWR_CPU_MIGRATE_EVENT_AVOID_DOUBLE_DEFINING /* * Set from_phys_cpu and to_phys_cpu to CPU_MIGRATE_ALL_CPUS to indicate * a whole-cluster migration: */ #define CPU_MIGRATE_ALL_CPUS 0x80000000U #endif #endif /* _TRACE_POWER_CPU_MIGRATE_H */ /* This part must be outside protection */ #undef TRACE_INCLUDE_FILE #define TRACE_INCLUDE_FILE power_cpu_migrate #include ummaryrefs log tree commit diff

path: root/net/unix

Age	Commit message (Collapse)	Author	Files	Lines
2017-02-02	unix: add ioctl to open a unix socket file with O_PATH	Andrey Vagin	1	-0/+41
	This ioctl opens a file to which a socket is bound and returns a file descriptor. The caller has to have CAP_NET_ADMIN in the socket network namespace. Currently it is impossible to get a path and a mount point for a socket file. socket_diag reports address, device ID and inode number for unix sockets. An address can contain a relative path or a file may be moved somewhere. And these properties say nothing about a mount namespace and a mount point of a socket file. With the introduced ioctl, we can get a path by reading /proc/self/fd/X and get mnt_id from /proc/self/fdinfo/X. In CRIU we are going to use this ioctl to dump and restore unix socket. Here is an example how it can be used: $ strace -e socket,bind,ioctl ./test /tmp/test_sock socket(AF_UNIX, SOCK_STREAM, 0) = 3 bind(3, {sa_family=AF_UNIX, sun_path="test_sock"}, 11) = 0 ioctl(3, SIOCUNIXFILE, 0) = 4 ^Z $ ss -a \| grep test_sock u_str LISTEN 0 1 test_sock 17798 * 0 $ ls -l /proc/760/fd/{3,4} lrwx------ 1 root root 64 Feb 1 09:41 3 -> 'socket:[17798]' l--------- 1 root root 64 Feb 1 09:41 4 -> /tmp/test_sock $ cat /proc/760/fdinfo/4 pos: 0 flags: 012000000 mnt_id: 40 $ cat /proc/self/mountinfo \| grep "^40\s" 40 19 0:37 / /tmp rw shared:23 - tmpfs tmpfs rw Signed-off-by: Andrei Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>