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new helpers: fdget()/fdput()

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Signed-off-bs: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-08-27 19:55:01 -04:00
parent 2a117354b7
commit a5b470ba06
1 changed files with 26 additions and 0 deletions
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26
include/linux/file.h
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@ -26,8 +26,34 @@ static inline void fput_light(struct file *file, int fput_needed)
fput(file);
}
struct fd {
struct file *file;
int need_put;
};
static inline void fdput(struct fd fd)
{
if (fd.need_put)
fput(fd.file);
}
extern struct file *fget(unsigned int fd);
extern struct file *fget_light(unsigned int fd, int *fput_needed);
static inline struct fd fdget(unsigned int fd)
{
int b;
struct file *f = fget_light(fd, &b);
return (struct fd){f,b};
}
static inline struct fd fdget_raw(unsigned int fd)
{
int b;
struct file *f = fget_raw_light(fd, &b);
return (struct fd){f,b};
}
extern struct file *fget_raw(unsigned int fd);
extern struct file *fget_raw_light(unsigned int fd, int *fput_needed);
extern int f_dupfd(unsigned int from, struct file *file, unsigned flags);