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file: Rename __close_fd to close_fd and remove the files parameter

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The function __close_fd was added to support binder[1].  Now that
binder has been fixed to no longer need __close_fd[2] all calls
to __close_fd pass current->files.

Therefore transform the files parameter into a local variable
initialized to current->files, and rename __close_fd to close_fd to
reflect this change, and keep it in sync with the similar changes to
__alloc_fd, and __fd_install.

This removes the need for callers to care about the extra care that
needs to be take if anything except current->files is passed, by
limiting the callers to only operation on current->files.

[1] 483ce1d4b8 ("take descriptor-related part of close() to file.c")
[2] 44d8047f1d ("binder: use standard functions to allocate fds")
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
v1: https://lkml.kernel.org/r/20200817220425.9389-17-ebiederm@xmission.com
Link: https://lkml.kernel.org/r/20201120231441.29911-21-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2020-11-20 17:14:38 -06:00
parent aa384d10f3
commit 8760c909f5
4 changed files with 9 additions and 12 deletions
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6
include/linux/syscalls.h
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@@ -1295,16 +1295,16 @@ static inline long ksys_ftruncate(unsigned int fd, loff_t length)
return do_sys_ftruncate(fd, length, 1);
}
extern int __close_fd(struct files_struct *files, unsigned int fd);
extern int close_fd(unsigned int fd);
/*
* In contrast to sys_close(), this stub does not check whether the syscall
* should or should not be restarted, but returns the raw error codes from
* __close_fd().
* close_fd().
*/
static inline int ksys_close(unsigned int fd)
{
return __close_fd(current->files, fd);
return close_fd(fd);
}
extern long do_sys_truncate(const char __user *pathname, loff_t length);