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new helpers: fdget()/fdput()

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Signed-off-bs: Al Viro <viro@zeniv.linux.org.uk>
Issue: SEC-2677
[Backport: move up declaration of fget_raw_light to before it's used.]
Change-Id: I52cd7555021d13f9c73481ea9a4f2562190524ec
(cherry picked from commit a5b470ba06aa3f96999ede5feba178df6bdb134a)
This commit is contained in:
Al Viro
2021-10-10 23:46:48 +02:00
committed by Francescodario Cuzzocrea
parent 5064b71d09
commit e1b124fb2e
1 changed files with 26 additions and 0 deletions
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include/linux/file.h
+26
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@@ -26,10 +26,36 @@ static inline void fput_light(struct file *file, int fput_needed)
fput(file); 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(unsigned int fd);
extern struct file *fget_light(unsigned int fd, int *fput_needed); extern struct file *fget_light(unsigned int fd, int *fput_needed);
extern struct file *fget_raw(unsigned int fd); extern struct file *fget_raw(unsigned int fd);
extern struct file *fget_raw_light(unsigned int fd, int *fput_needed); extern struct file *fget_raw_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 void set_close_on_exec(unsigned int fd, int flag); extern void set_close_on_exec(unsigned int fd, int flag);
extern void put_filp(struct file *); extern void put_filp(struct file *);
extern int alloc_fd(unsigned start, unsigned flags); extern int alloc_fd(unsigned start, unsigned flags);