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init: add an init_dup helper

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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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1
include/linux/init_syscalls.h
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@ -16,3 +16,4 @@ int __init init_unlink(const char *pathname);
int __init init_mkdir(const char *pathname, umode_t mode);
int __init init_rmdir(const char *pathname);
int __init init_utimes(char *filename, struct timespec64 *ts);
int __init init_dup(struct file *file);