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kernel/pid.c: remove static qualifier from pidfd_create()

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[ Upstream commit c576e0fcd6188d0edb50b0fb83f853433ef4819b ]

With the idea of returning pidfds from the fanotify API, we need to
expose a mechanism for creating pidfds. We drop the static qualifier
from pidfd_create() and add its declaration to linux/pid.h so that the
pidfd_create() helper can be called from other kernel subsystems
i.e. fanotify.

Link: https://lore.kernel.org/r/0c68653ec32f1b7143301f0231f7ed14062fd82b.1628398044.git.repnop@google.com
Signed-off-by: Matthew Bobrowski <repnop@google.com>
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Matthew Bobrowski 2021-08-08 15:24:33 +10:00 • committed by Ksawlii
parent b5ab4e8c2c
commit 87924b3e9e
2 changed files with 4 additions and 1 deletions
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1
include/linux/pid.h
View file

@ -78,6 +78,7 @@ struct file;
extern struct pid *pidfd_pid(const struct file *file);
struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags);
int pidfd_create(struct pid *pid, unsigned int flags);
static inline struct pid *get_pid(struct pid *pid)
{

4
kernel/pid.c
View file

@ -551,10 +551,12 @@ struct pid *pidfd_get_pid(unsigned int fd, unsigned int *flags)
* Note, that this function can only be called after the fd table has
* been unshared to avoid leaking the pidfd to the new process.
*
* This symbol should not be explicitly exported to loadable modules.
*
* Return: On success, a cloexec pidfd is returned.
* On error, a negative errno number will be returned.
*/
static int pidfd_create(struct pid *pid, unsigned int flags)
int pidfd_create(struct pid *pid, unsigned int flags)
{
int fd;