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| author | Christian Brauner <brauner@kernel.org> | 2023-03-27 20:22:51 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-04-03 11:16:56 +0200 |
| commit | 6ae930d9dbf2d093157be33428538c91966d8a9f (patch) | |
| tree | a89117e5612341376fc147f26b9715c47013d27d /kernel/pid.c | |
| parent | 197b6b60ae7bc51dd0814953c562833143b292aa (diff) | |
| download | linux-6ae930d9dbf2d093157be33428538c91966d8a9f.tar.gz linux-6ae930d9dbf2d093157be33428538c91966d8a9f.tar.bz2 linux-6ae930d9dbf2d093157be33428538c91966d8a9f.zip | |
pid: add pidfd_prepare()
Add a new helper that allows to reserve a pidfd and allocates a new
pidfd file that stashes the provided struct pid. This will allow us to
remove places that either open code this function or that call
pidfd_create() but then have to call close_fd() because there are still
failure points after pidfd_create() has been called.
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230327-pidfd-file-api-v1-1-5c0e9a3158e4@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'kernel/pid.c')
| -rw-r--r-- | kernel/pid.c | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/kernel/pid.c b/kernel/pid.c index 3fbc5e46b721..f93954a0384d 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -594,20 +594,15 @@ struct task_struct *pidfd_get_task(int pidfd, unsigned int *flags) */ int pidfd_create(struct pid *pid, unsigned int flags) { - int fd; - - if (!pid || !pid_has_task(pid, PIDTYPE_TGID)) - return -EINVAL; + int pidfd; + struct file *pidfd_file; - if (flags & ~(O_NONBLOCK | O_RDWR | O_CLOEXEC)) - return -EINVAL; - - fd = anon_inode_getfd("[pidfd]", &pidfd_fops, get_pid(pid), - flags | O_RDWR | O_CLOEXEC); - if (fd < 0) - put_pid(pid); + pidfd = pidfd_prepare(pid, flags, &pidfd_file); + if (pidfd < 0) + return pidfd; - return fd; + fd_install(pidfd, pidfd_file); + return pidfd; } /** |