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init: add an init_dup helper 

Add a simple helper to grab a reference to a file and install it at
the next available fd, and switch the early init code over to it.

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 2020-07-28 17:49:47 +02:00 committed by Al Viro
parent 235e57935b
commit f073531070
3 changed files with 17 additions and 4 deletions
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12
fs/init.c
View File

@ -8,6 +8,7 @@
#include <linux/namei.h> #include <linux/namei.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/fs_struct.h> #include <linux/fs_struct.h>
#include <linux/file.h>
#include <linux/init_syscalls.h> #include <linux/init_syscalls.h>
#include <linux/security.h> #include <linux/security.h>
#include "internal.h" #include "internal.h"
@ -251,3 +252,14 @@ int __init init_utimes(char *filename, struct timespec64 *ts)
path_put(&path); path_put(&path);
return error; return error;
} }
int __init init_dup(struct file *file)
{
int fd;
fd = get_unused_fd_flags(0);
if (fd < 0)
return fd;
fd_install(fd, get_file(file));
return 0;
}

1
include/linux/init_syscalls.h
View File

@ -16,3 +16,4 @@ int __init init_unlink(const char *pathname);
int __init init_mkdir(const char *pathname, umode_t mode); int __init init_mkdir(const char *pathname, umode_t mode);
int __init init_rmdir(const char *pathname); int __init init_rmdir(const char *pathname);
int __init init_utimes(char *filename, struct timespec64 *ts); int __init init_utimes(char *filename, struct timespec64 *ts);
int __init init_dup(struct file *file);

8
init/main.c
View File

@ -1467,10 +1467,10 @@ void __init console_on_rootfs(void)
pr_err("Warning: unable to open an initial console.\n"); pr_err("Warning: unable to open an initial console.\n");
return; return;
} }
get_file_rcu_many(file, 2); init_dup(file);
fd_install(get_unused_fd_flags(0), file); init_dup(file);
fd_install(get_unused_fd_flags(0), file); init_dup(file);
fd_install(get_unused_fd_flags(0), file); fput(file);
} }
static noinline void __init kernel_init_freeable(void) static noinline void __init kernel_init_freeable(void)