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uapi/fcntl: mark range as reserved

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Mark the range from -10000 to -40000 as a range reserved for special
in-kernel values. Move the PIDFD_SELF_*/PIDFD_THREAD_* sentinels over so
all the special values are in one place.

Link: https://lore.kernel.org/20250624-work-pidfs-fhandle-v2-6-d02a04858fe3@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-06-24 15:48:42 +02:00
parent 1c5484395f
commit a4c746f068
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2 changed files with 16 additions and 15 deletions
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16
include/uapi/linux/fcntl.h
View File

@ -90,10 +90,26 @@
#define DN_ATTRIB 0x00000020 /* File changed attibutes */
#define DN_MULTISHOT 0x80000000 /* Don't remove notifier */
/* Reserved kernel ranges [-100], [-10000, -40000]. */
#define AT_FDCWD -100 /* Special value for dirfd used to
indicate openat should use the
current working directory. */
/*
* The concept of process and threads in userland and the kernel is a confusing
* one - within the kernel every thread is a 'task' with its own individual PID,
* however from userland's point of view threads are grouped by a single PID,
* which is that of the 'thread group leader', typically the first thread
* spawned.
*
* To cut the Gideon knot, for internal kernel usage, we refer to
* PIDFD_SELF_THREAD to refer to the current thread (or task from a kernel
* perspective), and PIDFD_SELF_THREAD_GROUP to refer to the current thread
* group leader...
*/
#define PIDFD_SELF_THREAD -10000 /* Current thread. */
#define PIDFD_SELF_THREAD_GROUP -20000 /* Current thread group leader. */
/* Generic flags for the *at(2) family of syscalls. */

15
include/uapi/linux/pidfd.h
View File

@ -42,21 +42,6 @@
#define PIDFD_COREDUMP_USER (1U << 2) /* coredump was done as the user. */
#define PIDFD_COREDUMP_ROOT (1U << 3) /* coredump was done as root. */
/*
* The concept of process and threads in userland and the kernel is a confusing
* one - within the kernel every thread is a 'task' with its own individual PID,
* however from userland's point of view threads are grouped by a single PID,
* which is that of the 'thread group leader', typically the first thread
* spawned.
*
* To cut the Gideon knot, for internal kernel usage, we refer to
* PIDFD_SELF_THREAD to refer to the current thread (or task from a kernel
* perspective), and PIDFD_SELF_THREAD_GROUP to refer to the current thread
* group leader...
*/
#define PIDFD_SELF_THREAD -10000 /* Current thread. */
#define PIDFD_SELF_THREAD_GROUP -20000 /* Current thread group leader. */
/*
* ...and for userland we make life simpler - PIDFD_SELF refers to the current
* thread, PIDFD_SELF_PROCESS refers to the process thread group leader.