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fs: split receive_fd_replace from __receive_fd

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receive_fd_replace shares almost no code with the general case, so split
it out.  Also remove the "Bump the sock usage counts" comment from
both copies, as that is now what __receive_sock actually does.

[AV: ... and make the only user of receive_fd_replace() choose between
it and receive_fd() according to what userland had passed to it in
flags]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2021-03-25 09:22:09 +01:00
committed by Al Viro
parent a38fd87484
commit 42eb0d54c0
3 changed files with 35 additions and 32 deletions
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11
include/linux/file.h
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@@ -92,23 +92,20 @@ extern void put_unused_fd(unsigned int fd);
extern void fd_install(unsigned int fd, struct file *file);
extern int __receive_fd(int fd, struct file *file, int __user *ufd,
extern int __receive_fd(struct file *file, int __user *ufd,
unsigned int o_flags);
static inline int receive_fd_user(struct file *file, int __user *ufd,
unsigned int o_flags)
{
if (ufd == NULL)
return -EFAULT;
return __receive_fd(-1, file, ufd, o_flags);
return __receive_fd(file, ufd, o_flags);
}
static inline int receive_fd(struct file *file, unsigned int o_flags)
{
return __receive_fd(-1, file, NULL, o_flags);
}
static inline int receive_fd_replace(int fd, struct file *file, unsigned int o_flags)
{
return __receive_fd(fd, file, NULL, o_flags);
return __receive_fd(file, NULL, o_flags);
}
int receive_fd_replace(int new_fd, struct file *file, unsigned int o_flags);
extern void flush_delayed_fput(void);
extern void __fput_sync(struct file *);