forked from mirrors/linux
4a9d4b024a
... and schedule_work() for interrupt/kernel_thread callers (and yes, now it *is* OK to call from interrupt). We are guaranteed that __fput() will be done before we return to userland (or exit). Note that for fput() from a kernel thread we get an async behaviour; it's almost always OK, but sometimes you might need to have __fput() completed before you do anything else. There are two mechanisms for that - a general barrier (flush_delayed_fput()) and explicit __fput_sync(). Both should be used with care (as was the case for fput() from kernel threads all along). See comments in fs/file_table.c for details. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
|
|
* 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>
|
|
|
|
struct file;
|
|
|
|
extern void fput(struct file *);
|
|
|
|
struct file_operations;
|
|
struct vfsmount;
|
|
struct dentry;
|
|
struct path;
|
|
extern struct file *alloc_file(struct path *, fmode_t mode,
|
|
const struct file_operations *fop);
|
|
|
|
static inline void fput_light(struct file *file, int fput_needed)
|
|
{
|
|
if (fput_needed)
|
|
fput(file);
|
|
}
|
|
|
|
extern struct file *fget(unsigned int fd);
|
|
extern struct file *fget_light(unsigned int fd, int *fput_needed);
|
|
extern struct file *fget_raw(unsigned int fd);
|
|
extern struct file *fget_raw_light(unsigned int fd, int *fput_needed);
|
|
extern void set_close_on_exec(unsigned int fd, int flag);
|
|
extern void put_filp(struct file *);
|
|
extern int alloc_fd(unsigned start, unsigned flags);
|
|
extern int get_unused_fd(void);
|
|
#define get_unused_fd_flags(flags) alloc_fd(0, (flags))
|
|
extern void put_unused_fd(unsigned int fd);
|
|
|
|
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 */
|