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System : Linux cloud.heroica.com.br 4.18.0-553.36.1.el8_10.x86_64 #1 SMP Wed Jan 22 03:07:54 EST 2025 x86_64
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Directory :  /usr/src/kernels/4.18.0-553.64.1.el8_10.x86_64/include/linux/

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Current File : //usr/src/kernels/4.18.0-553.64.1.el8_10.x86_64/include/linux/file.h
/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Wrapper functions for accessing the file_struct fd array.
 */

#ifndef __LINUX_FILE_H
#define __LINUX_FILE_H

#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/posix_types.h>
#include <linux/cleanup.h>

struct file;

extern void fput(struct file *);
extern void fput_many(struct file *, unsigned int);

struct file_operations;
struct task_struct;
struct vfsmount;
struct dentry;
struct inode;
struct path;
extern struct file *alloc_file(const struct path *, int flags,
	const struct file_operations *fop);
extern struct file *alloc_file_pseudo(struct inode *, struct vfsmount *,
	const char *, int flags, const struct file_operations *);

static inline void fput_light(struct file *file, int fput_needed)
{
	if (fput_needed)
		fput(file);
}

struct fd {
	struct file *file;
	unsigned int flags;
};
#define FDPUT_FPUT       1
#define FDPUT_POS_UNLOCK 2

static inline void fdput(struct fd fd)
{
	if (fd.flags & FDPUT_FPUT)
		fput(fd.file);
}

extern struct file *fget(unsigned int fd);
extern struct file *fget_many(unsigned int fd, unsigned int refs);
extern struct file *fget_raw(unsigned int fd);
extern struct file *fget_task(struct task_struct *task, unsigned int fd);
extern unsigned long __fdget(unsigned int fd);
extern unsigned long __fdget_raw(unsigned int fd);
extern unsigned long __fdget_pos(unsigned int fd);
extern void __f_unlock_pos(struct file *);

static inline struct fd __to_fd(unsigned long v)
{
	return (struct fd){(struct file *)(v & ~3),v & 3};
}

static inline struct fd fdget(unsigned int fd)
{
	return __to_fd(__fdget(fd));
}

static inline struct fd fdget_raw(unsigned int fd)
{
	return __to_fd(__fdget_raw(fd));
}

static inline struct fd fdget_pos(int fd)
{
	return __to_fd(__fdget_pos(fd));
}

static inline void fdput_pos(struct fd f)
{
	if (f.flags & FDPUT_POS_UNLOCK)
		__f_unlock_pos(f.file);
	fdput(f);
}

DEFINE_CLASS(fd, struct fd, fdput(_T), fdget(fd), int fd)

extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);
extern int replace_fd(unsigned fd, struct file *file, unsigned flags);
extern void set_close_on_exec(unsigned int fd, int flag);
extern bool get_close_on_exec(unsigned int fd);
extern int __get_unused_fd_flags(unsigned flags, unsigned long nofile);
extern int get_unused_fd_flags(unsigned flags);
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)

/*
 * take_fd() will take care to set @fd to -EBADF ensuring that
 * CLASS(get_unused_fd) won't call put_unused_fd(). This makes it
 * easier to rely on CLASS(get_unused_fd):
 *
 * struct file *f;
 *
 * CLASS(get_unused_fd, fd)(O_CLOEXEC);
 * if (fd < 0)
 *         return fd;
 *
 * f = dentry_open(&path, O_RDONLY, current_cred());
 * if (IS_ERR(f))
 *         return PTR_ERR(fd);
 *
 * fd_install(fd, f);
 * return take_fd(fd);
 */
#define take_fd(fd) __get_and_null(fd, -EBADF)

extern void fd_install(unsigned int fd, struct file *file);

extern void flush_delayed_fput(void);
extern void __fput_sync(struct file *);

#endif /* __LINUX_FILE_H */

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