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file: add fput() cleanup helper

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Add a simple helper to put a file reference.

Link: https://lore.kernel.org/r/20240719-work-mount-namespace-v1-4-834113cab0d2@kernel.org
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-07-19 13:41:51 +02:00
parent 5fcf329676
commit 257b1c2c78
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1 changed files with 2 additions and 0 deletions
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2
include/linux/file.h
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@ -11,6 +11,7 @@
#include <linux/posix_types.h>
#include <linux/errno.h>
#include <linux/cleanup.h>
#include <linux/err.h>
struct file;
@ -96,6 +97,7 @@ extern void put_unused_fd(unsigned int fd);
DEFINE_CLASS(get_unused_fd, int, if (_T >= 0) put_unused_fd(_T),
get_unused_fd_flags(flags), unsigned flags)
DEFINE_FREE(fput, struct file *, if (!IS_ERR_OR_NULL(_T)) fput(_T))
/*
* take_fd() will take care to set @fd to -EBADF ensuring that